Back to results
US 9,543,877 B2Granted
Control apparatus for a switched reluctance motor
AssigneeDenso Corporation
InventorYoshinobu Kamada
Life of this patent
Estimating the term…
Abstract
An apparatus for controlling a switched reluctance motor with use of a power conversion circuit. In the apparatus, a command voltage setter sets a command voltage for a coil of the motor, where the command voltage is set to change gradually during either or both of a ramp-up period and a ramp-down period of the command voltage. A voltage controller controls an applied voltage to the coil to the command voltage set by the command voltage setter by operating the power conversion circuit.
Claims19
An apparatus for controlling a switched reluctance motor with use of a power conversion circuit, the apparatus comprising:
- a command voltage setter configured to set a command voltage for a coil of the motor, the command voltage being set to change gradually during either or both of a ramp-up period and a ramp-down period of the command voltage;
- and
- a voltage controller configured to control an applied voltage to the coil to the command voltage set by the command voltage setter by operating the power conversion circuit,
- wherein the command voltage setter is further configured to set the command voltage such that the command voltage has a continuous waveform for one cycle of electric angle of the motor and such that a zero voltage waveform is included as part of the waveform for one cycle of electric angle of the motor, and
- the command voltage setter is still further configured to perform all of:
- a first process of increasing the command voltage gradually from zero to a first predetermined voltage which is positive during a first time period as the ramp-up period of the command voltage so that a flux linkage of the coil increases gradually from a value when the zero voltage waveform of the command voltage ends to a first predetermined value which is positive;
- a second process of increasing the command voltage gradually from a second predetermined voltage which is negative to zero during a second time period as the ramp-up period of the command voltage so that the flux linkage of the coil decreases gradually from a second predetermined value which is positive to a value when the zero voltage waveform of the command voltage starts;
- a third process of decreasing a third predetermined voltage which is positive to zero gradually during a third time period as the ramp-down period of the command voltage so that the flux linkage of the coil increases gradually from a third predetermined value equal to or greater than zero to a fourth predetermined value greater than the third predetermined value;
- a fourth process of decreasing the command voltage gradually from zero to a fourth predetermined voltage which is negative during a fourth time period as the ramp-down period of the command voltage so that the flux linkage of the coil decreases gradually from a fifth predetermined value which is positive to a sixth predetermined value which is equal to or greater than zero and is less than the fifth predetermined value;
- and
- a fifth process of setting the zero voltage waveform,
- the first to fifth processes are to be performed during one cycle of electric angle of the motor in a sequential order of the first, third, fourth, second, and fifth proceeses,
- the first and third predetermined values are the same positive value,
- the first and third predetermined voltages are at the same value,
- the fourth and fifth predetermined values are the same value,
- the sixth and second predetermined values are the same positive value, and
- the fourth and second predetermined voltages are at the same value.
14 more elements
An apparatus for controlling a switched reluctance motor with use of a power conversion circuit, the apparatus comprising:
- a command voltage setter configured to set a command voltage for a coil of the motor, the command voltage being set to change gradually during either or both of a ramp-up period and a ramp-down period of the command voltage;
- and
- a voltage controller configured to control an applied voltage to the coil to the command voltage set by the command voltage setter by operating the power conversion circuit,
- wherein the command voltage setter is further configured to perform at least one of:
- a first process of increasing the command voltage gradually from zero to a first predetermined voltage which is positive during a first time period as the ramp-up period of the command voltage so that a flux linkage of the coil increases gradually from a value when the command voltage becomes zero to a first predetermined value which is positive;
- a second process of increasing the command voltage gradually from a second predetermined voltage which is negative to zero during a second time period as the ramp-up period of the command voltage so that the flux linkage of the coil decreases gradually from a second predetermined value which is positive to a value when the command voltage becomes zero;
- a third process of decreasing a third predetermined voltage which is positive to zero gradually during a third time period as the ramp-down period of the command voltage so that the flux linkage of the coil increases gradually from a third predetermined value equal to or greater than zero to a fourth predetermined value greater than the third predetermined value;
- and
- a fourth process of decreasing the command voltage gradually from zero to a fourth predetermined voltage which is negative during a fourth time period as the ramp-down period of the command voltage so that the flux linkage of the coil decreases gradually from a fifth predetermined value which is positive to a sixth predetermined value which is equal to or greater than zero and is less than the fifth predetermined value;
- wherein the command voltage setter is further configured to set the command voltage such that, during an energization period, in which the coil is energized, included within one cycle of an electric angle of the motor, an absolute value of a difference between an area of a region enclosed by an axis line defining a zero command voltage and a waveform of the command voltage on the positive command voltage side of the axis line and an area of a region enclosed by the axis line and the waveform of the command voltage on the negative command voltage side of the axis line is equal to or less than a predefined value;
- and
- wherein the command voltage setter is further configured to set the command voltage such that the area of the region on the positive command voltage side of the axis line is greater than the area of the region on the negative command voltage side of the axis line.
9 more elements
Dependencies are inferred from the claim text.