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US RE34,609 EGranted
Collectorless direct current motor, driver circuit for a drive and method of operating a collectorless direct current motor
AssigneePapst Licensing GmbH & Co. KG
InventorRolf Mueller
Life of this patent
Estimating the term…
Abstract
A method for the low-loss regulation of a collectorless direct current motor and a semiconductor circuit has, during the commutation phase given by a position sensor and with reduced motor output and number of revolutions, transistors or one end transistor which initially operates temporarily as a switch and thereafter operates temporarily as an analog amplifier element. During the analog period, a current is available which changes slowly according to a ramp function.
Claims39
Driver circuit for a collectorless direct current motor including a permanent magnet rotor having at least two poles and at least one stator winding, comprising:
- a driver circuit end stage connected to the stator winding for temporarily operating as a switch,
- a sensor for detecting a position of the rotor, said sensor producing sensor signals which are representative of a commutation phase,
- a control siganl, said control signal being supplied to said driver circuit end stage during each said commutation phase, said control signal causing a ramp-shaped current curve to arise as a function of time in the stator winding,
- said driver circuit end having a linkage circuit which is controlled by said control signal and by said sensor signals of said sensor, said linkage circuit producing an end stage control signal whose duration is variable and is less than the duration of a respective one of said sensor signals,
- said driver circuit end stage including at least one semiconductor element which operates during said commutation phase for a first period of time as a switch and for a second period of time as an analog amplifier, current in said semiconductor element being relatively constant during said first period of time and changing according to a predetermined ramp function during said second period of time.
2 more elements
Collector less direct current motor for driving a fan comprising:
- a stator having at least one stator winding;
- a permanent magnet rotor having at least two poles and being disposed in the field of said at least one stator winding,
- said at least one stator winding being supplied with an operating voltage by a circuit, said circuit having
- a position sensing means for detecting a position of said permanent magnet rotor to determine a commutation phase thereof,
- at least one semiconductor element supplying current to said stator winding,
- a temperature sensing means for detecting temperature of an air stream drawn by the fan,
- and a control means for controlling said at least one semiconductor element during said
- commutation phase based upon the temperature sensed by said temperature sensing means,
- said at least one semiconductor element included in said circuit being controlled by said control means to operate as a switch for supplying a relatively constant current over a part of the commutation phase and as an analog amplifier element over another part of the commutation phase,
- said at least one semiconductor element, during a period of time [where in] wherein a reduction in revolution rate of said permanent magnet rotor occurs, operating initially as a switch and thereafter operating temporarily as an analog amplifier, current in said at least one semiconductor element being reduced during said period of time according to a predetermined ramp function.
7 more elements
A collectorless direct current motor for driving a fan, comprising
- a stator having at least one stator winding,
- a permanent magnet rotor having at least two poles and being disposed in the field of the at least one stator winding, and
- circuit means for supplying the at least one stator winding with an operating current, the circuit means having a position sensing means for detecting a position of the permanent magnet rotor to determine a commutation phase for the operating current supplied by the circuit means to the stator winding,
- the circuit means also including
- at least one semiconductor element supplying current to the stator winding,
- temperature sensing means for detecting a temperature influenced by the fan,
- control means for controlling the at least one semiconductor element during the commutation phase based upon the temperature sensed by the temperature sensing means,
- the at least one semiconductor element being controlled by the control means to operate in a switched mode for supplying the current to the stator winding over a part of the commutation phase, which is less than all of the commutation phase, and
- the at least one semiconductor element and the control means being coupled to the temperature sensing means and operating to switch the current on only once in a commutation phase in variable dependence upon the detected temperature to change the revolution rate of the motor.
6 more elements
A collectorless direct current motor for driving a fan, comprising
- a stator having at least one stator winding,
- a permanent magnet rotor having at least two poles and being disposed in the field of the at least one stator winding, and
- circuit means for supplying the at least one stator winding with an operating current, the circuit means having a position sensing means for detecting a position of the permanent magnet rotor to determine a commutation phase for the operating current supplied by the circuit means to the stator winding,
- the circuit means also including
- at least one semiconductor element supplying current to the stator winding,
- temperature sensing means for detecting a temperature influenced by the fan,
- control means for controlling the at least one semiconductor element during the commutation phase based upon the temperature sensed by the temperature sensing means,
- the at least one semiconductor element being controlled by the control means to produce an at least partly analog signal determining the current to the stator winding, the current being supplied over a part of the commutation phase, which is less than all of the commutation phase, and
- the at least one semiconductor element and the control means being coupled to the temperature sensing means and operating to supply the current continuously only once in a commutation phase in variable dependence upon the detected temperature to change the revolution rate of the motor.
6 more elements
In a fan, a driver circuit for a collectorless direct current motor including a permanent magnet rotor having at least two poles and at least one stator winding, comprising:
- a driver circuit end stage connected to the stator winding for temporarily operating as a switch,
- a sensor for detecting a position of the rotor, said sensor producing sensor signals which are representative of a commutation phase,
- a ramp generator responding to said sensor signals and producing a ramp-shaped control signal,
- said control signal being supplied to said driver circuit end stage during each said commutation phase, said control signal causing a current curve as a function of time in the stator winding, and
- a sensor for detecting a temperature influenced by the fan, said sensor producing a temperature-dependent signal,
- said driver circuit end stage having a linkage circuit which is controlled by said control signal, by said sensor signals and by said temperature-dependent signal, said linkage circuit producing an end stage control signal whose duration is variable and is less than the duration of
- a respective one of said sensor signals.
4 more elements
In a fan, a driver circuit for a collectorless direct current motor including a permanent magnet rotor having at least two poles and at least one stator winding, comprising:
- a driver circuit end stage connected to the stator winding for temporarily operating as a switch,
- a sensor for detecting a position of the rotor, said sensor producing sensor signals which are representative of a commutation phase,
- a ramp generator responding to said sensor signals and producing a ramp-shaped control signal,
- said control signal being supplied to said driver circuit end stage during each said commutation phase, said control signal causing a current curve as a function of time in the stator winding, and
- means for providing, separate from said control signal, a command signal for said driver circuit end stage,
- said driver circuit end stage having a linkage circuit which is controlled by said control signal, by said sensor signals and by said command signal, said linkage circuit producing an end stage control signal whose duration is variable and is less than the duration of a respective one of said sensor signals.
3 more elements
Dependencies are inferred from the claim text.