US 6,271,641 B1 · Step motor driving device

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) an exciter for supplying power to excite the driving-winding;
(c) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal and outputting an exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting signal,
wherein said excitation-timing-controller outputs the exciting signal responding to the input of the driving-instruction-signal when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, and outputs the exciting signal responding to the input of the position-detecting-signal when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction for said step-motor to rotate in the desirable direction.

2 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding, wherein said exciter receives an exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
and
(d) an exciting-current-controller for outputting an exciting-current-control-signal as a current-value-signal to said exciter responsive to a phase-difference between a driving-instruction-signal and the position-detecting-signal, both of the signals are fed into said exciter,
wherein when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, said exciting-current-controller changes the exciting-current-control-signal to reducing a maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal, and
wherein when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction for said step-motor to rotate in the desirable direction, said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal.

4 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
and
(e) an exciting-current-controller for outputting a current-value-signal to said exciter responsive to a phase-difference between the driving-instruction-signal and the position-detecting-signal,
wherein when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, said excitation-timing-controller outputs the exciting signal responding to an input of the driving-instruction-signal and said exciting-current-controller changes the exciting-current-control-signal to decrease a maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal, and
wherein when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction for said step-motor to rotate in the desirable direction, said excitation-timing-controller outputs the exciting signal responding to an input of the position-detecting-signal and said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal.

5 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) an exciter for supplying power to excite the driving-winding;
(c) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal and for outputting an exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting signal,
wherein said excitation-timing-controller comprises:
(d-1) a delay-signal-selector for outputting a later input signal between the driving-instruction-signal and the position-detecting-signal when said step-motor is instructed to rotate in a positive direction, and outputting a later input signal between the driving-instruction-signal and a signal reversed to the position-detecting-signal when said step-motor is instructed to rotate in a negative direction;
(d-2) a deviation-detector for detecting one of which status a difference of numbers of pulses between the driving-instruction-signal and a signal reversed to the position-detecting-signal, i.e. a deviation, falls into, a first status where the deviation falls within a given range, a second status where the deviation falls outside the given range and requires forward torque directing the mover of said step-motor in the positive direction for the deviation to fall within the given range, and a third status where the deviation falls outside the given range and requires reverse torque directing the mover of said step-motor in a negative direction for the deviation to fall within the given range;
and
(d-3) an exciting-signal-selector for selecting one of an output signal from said delay-signal-selector, the position-detecting-signal and the signal reversed to the position-detecting-signal based on a detection result by said deviation detector,
wherein when said deviation detector detects the deviation in the first status, said exciting-signal-selector selects the output signal from said delay-signal-selector as the exciting signal;
wherein when said deviation detector detects the deviation in the second status, said exciting-signal-selector selects the position-detecting-signal as the exciting signal;
and
wherein when said deviation detector detects the deviation in the third status, said exciting-signal-selector selects the signal reversed to said position-detecting-signal as the exciting signal.

10 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
and
(e) an exciting-current-controller for outputting the current-value-signal to said exciter responsive to a phase-difference between the driving-instruction-signal and the position-detecting-signal,
wherein said excitation-timing-controller comprises:
a delay-signal-selector for outputting a later input signal between the driving-instruction-signal and the position-detecting-signal when said step-motor is instructed to rotate in a positive direction, and for outputting a later input signal between the driving-instruction-signal and a signal reversed to the position-instructing-signal when said step-motor is instructed to rotate in a negative direction,
a deviation-detector for detecting one of which status a difference of numbers of pulses between the driving-instruction-signal and the position-detecting-signal, i.e. a deviation, falls into, a first status where the deviation falls within a given range, a second status where the deviation falls outside the given range and requires forward torque directing a mover of said step-motor in a positive direction for the deviation to fall within the given range, and a third status where the deviation falls outside the given range and requires reverse torque directing the mover of said step-motor in a negative direction for the deviation to fall within the given range;
and
an exciting-signal-selector for selecting one of an output signal from said delay-signal-selector, the position-detecting-signal and the signal reversed to the position-detecting-signal based on a detection result by said deviation detector,
wherein when said deviation detector detects the deviation in the first status, said exciting-signal-selector selects an output signal from said delay-signal-selector as the exciting signal;
wherein when said deviation detector detects the deviation in the second status, said exciting-signal-selector selects the position-detecting-signal as the exciting signal;
and
wherein when said deviation detector detects the deviation in the third status, said exciting-signal-selector selects the signal reversed to said position-detecting-signal as the exciting signal,
wherein when said step-motor is instructed to rotate in the positive direction, said exciting-current-controller considers the phase difference of the driving-instruction-signal being delayed with regard to the position-detecting-signal in phases as a delay-phase-difference as well as considers the phase difference of the driving-instruction-signal being advanced with regard to the position-detecting-signal in phases as an advance-phase-difference, and when said step-motor is instructed to rotate in the negative direction, said exciting-current-controller considers the phase difference of the driving-instruction-signal being delayed with regard to the signal reversed to the position-detecting-signal in phases as a delay-phase-difference as well as considers the phase difference of the driving-instruction-signal being advanced with regard to the signal reversed to the position-detecting-signal in phases as an advance-phase-difference,
wherein when the delay-phase-difference is produced, said exciting-current-controller changes the exciting-current-control-signal to reduce the maximum exciting-current of the driving-winding, and when the advance-phase-difference is produced, said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding.

14 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
and
(e) an exciting-current-compulsory-booster for enabling the current-value-signal supplied to said exciter to increase compulsorily the exciting current of the driving-winding,
wherein said excitation-timing-controller comprises:
(e-1) a delay-signal-selector for outputting a later input signal between the driving-instruction-signal and the position-detecting-signal when said step-motor is instructed to rotate in a positive direction, and outputting a later input signal between the driving-instruction-signal and a signal reversed to the position-detecting-signal when said step-motor is instructed to rotate in a negative direction;
(e-2) a deviation-detector for detecting one of which status a difference of numbers of pulses between the driving-instruction-signal and the position-detecting-signal, i.e. a deviation, falls into, a first status where the deviation falls within a given range, a second status where the deviation falls outside the given range and requires forward torque directing a mover of said step-motor in a positive direction for the deviation to fall within the given range, and a third status where the deviation falls outside the given range and requires reverse torque directing the mover of said step-motor in a negative direction for the deviation to fall within the given range;
and
(e-3) an exciting-signal-selector for selecting one of an output signal supplied from said delay-signal-selector, the position-detecting-signal and the signal reversed to the position-detecting-signal based on a detection result by said deviation detector,
wherein when said deviation detector detects the deviation in the first status, said exciting-signal-selector selects an output signal from said delay-signal-selector as the exciting signal;
wherein when said deviation detector detects the deviation in the second status, said exciting-signal-selector selects the position-detecting-signal as the exciting signal;
and
wherein when said deviation detector detects the deviation in the third status, said exciting-signal-selector selects the signal reversed to said position-detecting-signal as the exciting signal,
wherein said exciting-current-compulsory-booster increases compulsorily the exciting-current of the driving-winding when said deviation detector detects one of the second status and the third status.

13 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
(e) an exciting-current-controller for outputting a current-value-signal to said exciter responsive to a phase-difference between the driving-instruction-signal and the position-detecting-signal;
and
(f) an exciting-current-compulsory-booster for increasing compulsorily the exciting current of the driving-winding,
wherein said excitation-timing-controller comprises:
a delay-signal-selector for outputting a later input signal between the driving-instruction-signal and the position-detecting-signal when said step-motor is instructed to rotate in a positive direction, and for outputting a later input signal between the driving-instruction-signal and a signal reversed to the position-instructing-signal when said step-motor is instructed to rotate in a negative direction,
a deviation-detector for detecting one of which status a difference of numbers of pulses between the driving-instruction-signal and the position-detecting-signal, i.e. a deviation, falls into, a first status where the deviation falls within a given range, a second status where the deviation falls outside the given range and requires forward torque directing a mover of said step-motor in a positive direction for the deviation to fall within the given range, and a third status where the deviation falls outside the given range and requires reverse torque directing the mover of said step-motor in a negative direction for the deviation to fall within the given range;
and
an exciting-signal-selector for selecting one of an output signal from said delay-signal-selector, the position-detecting-signal and the signal reversed to the position-detecting-signal based on a detection result by said deviation detector,
wherein when said deviation detector detects the deviation in the first status, said exciting-signal-selector selects an output signal from said delay-signal-selector as the exciting signal;
wherein when said deviation detector detects the deviation in the second status, said exciting-signal-selector selects the position-detecting-signal as the exciting signal;
and
wherein when said deviation detector detects the deviation in the third status, said exciting-signal-selector selects the signal reversed to said position-detecting-signal as the exciting signal,
wherein when said step-motor is instructed to rotate in the positive direction, said exciting-current-controller considers the phase difference of the driving-instruction-signal being delayed with regard to the position-detecting-signal in phases as a delay-phase-difference as well as considers the phase difference of the driving-instruction-signal being advanced with regard to the position-detecting-signal in phases as an advance-phase-difference, and when said step-motor is instructed to rotate in the negative direction, said exciting-current-controller considers the phase difference of the driving-instruction-signal being delayed with regard to the signal reversed to the position-detecting-signal in phases as the delay-phase-difference as well as considers the phase difference of the driving-instruction-signal being advanced with regard to the signal reversed to the position-detecting-signal in phases as the advance-phase-difference,
wherein when the delay-phase-difference is produced, said exciting-current-controller changes the exciting-current-control-signal to reduce the maximum exciting-current of the driving-winding, and when the advance-phase-difference is produced, said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding, and
wherein said exciting-current-compulsory-booster increases compulsorily the exciting-current of the driving-winding when said deviation detector detects one of the second status and the third status.

16 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
(e) an exciting-current-controller for outputting a current-value-signal to said exciter responsive to a phase-difference between the driving-instruction-signal and the position-detecting-signal;
and
(f) an exciting-current-compulsory-booster for increasing compulsorily the exciting current of the driving-winding,
wherein said excitation-timing-controller comprises:
a delay-signal-selector for outputting a later input signal between the driving-instruction-signal and the position-detecting-signal when said step-motor is instructed to rotate in a positive direction, and for outputting the later input signal between the driving-instruction-signal and a signal reversed to the position-instructing-signal when said step-motor is instructed to rotate in a negative direction,
a deviation-detector for detecting one of which status a difference of numbers of pulses between the driving-instruction-signal and the position-detecting-signal, i.e. a deviation, falls into, a first status where the deviation falls within a given range, a second status where the deviation falls outside the given range and requires forward torque directing a mover of said step-motor in a positive direction for the deviation to fall within the given range, a third status where the deviation falls outside the given range and requires reverse torque directing the mover of said step-motor in a negative direction for the deviation to fall within the given range, and a fourth status where the deviation has a wider range than the given range, and
an exciting-signal-selector for selecting one of an output signal from said delay-signal-selector, the position-detecting-signal and the signal reversed to the position-detecting-signal based on a detection result by said deviation detector,
wherein when said deviation detector detects the deviation in the first status, said exciting-signal-selector selects an output signal from said delay-signal-selector as the exciting signal;
wherein when said deviation detector detects the deviation in the second status, said exciting-signal-selector selects the position-detecting-signal as the exciting signal;
and
wherein when said deviation detector detects the deviation in the third status, said exciting-signal-selector selects the signal reversed to said position-detecting-signal as the exciting signal,
wherein when said step-motor is instructed to rotate in the positive direction, said exciting-current-controller considers the phase difference of the driving-instruction-signal being delayed with regard to the position-detecting-signal in phases as a delay-phase-difference as well as considers the phase difference of the driving-instruction-signal being advanced with regard to the position-detecting-signal in phases as an advance-phase-difference, and when said step-motor is instructed to rotate in the negative direction, said exciting-current-controller considers the phase difference of the driving-instruction-signal being delayed with regard to the signal reversed to the position-detecting-signal in phases as a delay-phase-difference as well as considers the phase difference of the driving-instruction-signal being advanced with regard to the signal reversed to the position-detecting-signal in phases as an advance-phase-difference,
wherein when the delay-phase-difference is produced, said exciting-current-controller changes the exciting-current-control-signal to reduce the maximum exciting-current of the driving-winding, and when the advance-phase-difference is produced, said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding, and
wherein said exciting-current-compulsory-booster increases compulsorily the exciting-current of the driving-winding when said deviation detector detects the deviation leaves the fourth status.

15 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
and
(d) an exciting-current-controller for outputting an exciting-current-control-signal as a current-value-signal to said exciter responsive to a phase-difference between a driving-instruction-signal and the position-detecting-signal, both of which are fed into said exciter,
wherein when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, said exciting-current-controller changes the exciting-current-control-signal to reduce a maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal, and
wherein when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction, said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal,
wherein said exciting-current-controller comprises an exciting-current-decrease-halter including a halt-width-generator, wherein said halter halts the exciting-current-control-signal from changing this change induces the maximum exciting-current of the driving-winding to decrease while said halt-width-generator keeps supplying an exciting-current-decrease-halting-signal.

5 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
and
(e) an exciting-current-controller for outputting a current-value-signal to said exciter responsive to a phase-difference between the driving-instruction-signal and the position-detecting-signal,
wherein when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, said excitation-timing-controller outputs the exciting signal responding to an input of the driving-instruction-signal and said exciting-current-controller changes the exciting-current-control-signal to decrease a maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal,
wherein when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction, said excitation-timing-controller outputs the exciting signal responding to an input of the position-detecting-signal and said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal, and
wherein said exciting-current-controller comprises an exciting-current-decrease-halter including a halt-width-generator, wherein said halter halts the exciting-current-control-signal from changing this change induces the maximum exciting-current of the driving-winding to decrease while said halt-width-generator keeps supplying an exciting-current-decrease-halting-signal.

6 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) an exciter for supplying power to excite the driving-winding;
(c) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal and outputting an exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting signal, wherein said excitation-timing-controller outputs the exciting signal responding to the input of the driving-instruction-signal when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, and outputs the exciting signal responding to the input of the position-detecting-signal when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desired direction for said step-motor to rotate in a desirable direction;
(e) an exciting-signal-stability-determiner for determining whether the exciting signal supplied from said excitation-timing-controller stays in a stable condition where the exciting signal keeps responding to one of the input of the driving-instruction-signal and the position-detecting-signal for a long period, or the exciting signal supplied from said excitation-timing-controller stays in an unstable condition where the exciting signal alternates responses to one of the input of the driving-instruction-signal and the position-detecting-signal for a short period;
and
(f) a selector for selecting one of the driving-instruction-signal and the exciting signal and outputting a selected signal based on a result determined by said exciting-signal-stability-determiner,
wherein when said exciting-signal-stability-determiner determines the exciting signal is in the stable condition, said selector selects the exciting signal to excite the driving-winding, and when said exciting-signal-stability-determiner determines the exciting signal is in the unstable condition, said selector selects the driving-instruction-signal to excite the driving-winding.

5 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) an exciter for supplying power to excite the driving-winding;
(c) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal including an advanced-phase-signal and a delayed-phase-signal with regard to an inductive voltage generated by the driving-winding;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
wherein when said step-motor is instructed to rotate in a positive direction, said excitation-timing-controller outputs the exciting signal responding to a later input signal between the driving-instruction-signal and the position-detecting-signal, and when the step-motor is instructed to rotate in a negative direction, said excitation-timing-controller outputs the exciting current responding to a later input signal between the driving-instruction-signal and a signal reversed to the position-detecting-signal;
(e) an exciting-signal-stability-determiner for determining whether the exciting signal supplied from said excitation-timing-controller stays in a stable condition where the exciting signal keeps responding to one of the input of the driving-instruction-signal and the position-detecting-signal for a long period, or the exciting signal supplied from said excitation-timing-controller stays in an unstable condition where the exciting signal alternates responses to one of the input of the driving-instruction-signal and the position-detecting-signal for a short period;
and
(f) a selector for receiving the driving-instruction-signal and the exciting signal, and for selecting and outputting the exciting signal to said exciter when said exciting-signal-stability-determiner determines the exciting signal is in the stable condition as well as selecting and outputting the driving-instruction-signal to said exciter when said exciting-signal-stability-determiner determines the exciting signal is in the unstable condition,
wherein the driving-winding is kept exciting responsive to the driving-instruction-signal until every position-detecting-signal indicating an advanced-phase and a delayed-phase detected by said position-detector is input with a delay with regard to an input of the driving-instruction-signal.

6 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) an exciter for supplying power to excite the driving-winding;
(c) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
and
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
wherein said position detector outputs the position-detecting-signal indicating an advanced-phase with regard to an inductive voltage generated by the driving-winding,
wherein when said step-motor is instructed to rotate in a positive direction, said excitation-timing-controller outputs the exciting signal responding to a later input signal between the driving-instruction-signal and the position-detecting-signal, and when the step-motor is instructed to rotate in a negative direction, said excitation-timing-controller outputs the exciting signal responding to a later input signal between the driving-instruction-signal and a signal reversed to the position-detecting-signal, and
wherein the driving-winding is kept exciting responsive to the driving-instruction-signal until the position-detecting-signal indicating an advanced-phase detected by said position-detector is input with a delay with regard to an input of the driving-instruction-signal.

5 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an exciting-current-controller for outputting an exciting-current-control-signal as a current-value-signal to said exciter responsive to a phase-difference between a driving-instruction-signal and the position-detecting-signal, both of which are fed into said exciter,
wherein said position detector outputs the position-detecting-signal indicating an advanced-phase with regard to an inductive voltage generated by the driving-winding,
wherein when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, said exciting-current-controller changes the exciting-current-control-signal to reduce a maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal, and
wherein when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction, said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal,
wherein said exciting-current-controller comprises:
an exciting-current-decrease-halter including a halt-width-generator;
and
an exciting-current-boosting-interrupter including an interrupt-width-generator,
wherein said halter halts the exciting-current-control-signal from changing this change induces the maximum exciting-current of the driving-winding to decrease while said halt-width-generator keeps supplying an exciting-current-decrease-halting-signal, and
wherein said exciting-current-boosting-interrupter outputs an exciting-signal-boosting-interrupt-signal during a period since the interrupt-width-generator outputs an interrupt-enable-signal responding to an output from said position detector and then the driving-instruction-signal changes while an interrupt-enable-signal is supplied until a supply of the interrupt-enable-signal is completed, and said interrupter changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding while the exciting-current-boosting-interrupt-signal is kept supplying.

10 more elements

A step-motor-driving device comprising:

(a) a step-motor having a driving-winding for plurality of phases;
(b) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;
(c) an exciter for supplying power to excite the driving-winding wherein said exciter receives the exciting signal and a current-value-signal, then switches an excitation of the driving-winding responsive to the exciting signal, and determines a maximum exciting current responsive to the current-value-signal;
(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal, and for outputting the exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal;
and
(e) an exciting-current-controller for outputting a current-value-signal to said exciter responsive to a phase-difference between the driving-instruction-signal and the position-detecting-signal,
wherein when an exciting-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for said step-motor to rotate in a desirable direction, said excitation-timing-controller outputs the exciting signal responsive to an input of the driving-instruction-signal, and said exciting-current-controller changes the exciting-current-control-signal to decrease a maximum exciting-current of the driving-winding responsive to a phase difference between the driving-instruction-signal and the position-detecting-signal,
wherein when an exciting-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction, said excitation-timing-controller outputs the exciting signal responsive to an input of the position-detecting-signal, and said exciting-current-controller changes the exciting-current-control-signal to increase the maximum exciting-current of the driving-winding responsive to the phase difference between the driving-instruction-signal and the position-detecting-signal,
wherein said position detector outputs the position-detecting-signal in an advanced-phase with regard to an inductive voltage generated by the driving-winding, and
wherein said exciting-current-controller comprises:
an exciting-current-decrease-halter including a halt-width-generator;
and
an exciting-current-boosting-interrupter including an interrupt-width-generator,
wherein said halter halts the exciting-current-control-signal from changing this change induces the maximum exciting-current of the driving-winding to decrease while said halt-width-generator keeps supplying an exciting-current-decrease-halting-signal responsive to an output from the position-detecting-signal, and
wherein said exciting-current-boosting-interrupter outputs an exciting-signal-boosting-interrupt-signal during a period since the interrupt-width-generator outputs an interrupt-enable-signal responding to an output from said position detector and then the driving-instruction-signal changes while an interrupt-enable-signal is supplied until a supply of the interrupt-enable-signal is completed, and said interrupter changes the exciting-current-control-signal to increase a maximum exciting-current of the driving-winding while the exciting-current-boosting-interrupt-signal is kept supplying.

12 more elements

Step motor driving device

Life of this patent

Step motor driving device

Life of this patent

Abstract

Claims45