TORQUE RIPPLE REDUCTION FOR A VOLTAGE MODE MOTOR CONTROLLER
First Claim
1. A system to reduce torque ripple in a motor controller, the system comprising:
- a voltage detector that detects output voltage at each phase of the motor controller;
a gain stage operable to apply gain compensation for each phase of the motor controller;
a PWM driving circuit for driving a motor; and
a processor with an input coupled to the voltage detector and an output coupled to the gain stage, the processor inputs the voltage at each phase of the motor controller from the sensor, determines a voltage mismatch between the phases;
phase grounds the most negative phase of the motor controller, calculates a voltage gain for the phases to compensate for voltage mismatches therebetween.
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Accused Products
Abstract
A system and method for reducing torque ripple in a motor controller includes a step (60) of measuring an output voltage at each phase of the motor controller. A next step (61) includes determining a voltage mismatch between the phases. A next step (62) includes phase grounding one phase of the motor. A next step (63) includes calculating a voltage gain for the phases to compensate for voltage mismatches therebetween. The compensating gain can include a gain and/or offset, which are applied as a function of motor angle and is used to generate a PWM signal for driving the motor with reduced torque ripple.
21 Citations
19 Claims
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1. A system to reduce torque ripple in a motor controller, the system comprising:
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a voltage detector that detects output voltage at each phase of the motor controller;
a gain stage operable to apply gain compensation for each phase of the motor controller;
a PWM driving circuit for driving a motor; and
a processor with an input coupled to the voltage detector and an output coupled to the gain stage, the processor inputs the voltage at each phase of the motor controller from the sensor, determines a voltage mismatch between the phases;
phase grounds the most negative phase of the motor controller, calculates a voltage gain for the phases to compensate for voltage mismatches therebetween. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for reducing torque ripple in a motor controller, the method comprising the steps of:
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measuring output voltages of each phase of the motor controller;
determining a voltage mismatch between the phases of the motor controller;
phase grounding one phase of the motor controller; and
calculating a compensation gain for the phases to compensate for voltage mismatches. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for reducing torque ripple in a motor controller, the method comprising the steps of:
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measuring output voltages of each phase of the motor controller;
determining a voltage mismatch between the phases of the motor controller;
phase grounding the most negative phase of the motor controller;
calculating a compensation gain, as a function of angle, for the phases to compensate for voltage mismatches therebetween; and
constructing a PWM pulse train for driving a motor. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification