Torque ripple sensor and mitigation mechanism
First Claim
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1. An apparatus for sensing fluctuations in torque from a permanent magnet machine, the permanent magnet machine being contained in a housing, the apparatus comprising:
- a piezoelectric sensor coupled to said permanent magnet machine to receive transmitted vibration produced by the fluctuations of the permanent magnet machine, said piezoelectric sensor producing a sensor signal corresponding to an amplitude of said vibration.
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Abstract
A torque ripple sensor and method for torque ripple sensing and/or mitigation. A piezoelectric sensor is positioned relative to a motor so that torque fluctuations due to torque ripple of the motor are transmitted to the sensor, resulting in strain of a piezoelectric element. A resulting signal can be amplified and conditioned for determining a magnitude of the torque ripple and/or fed into a feedback loop for applying current control or a counter-torque to the motor for torque ripple mitigation.
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Citations
27 Claims
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1. An apparatus for sensing fluctuations in torque from a permanent magnet machine, the permanent magnet machine being contained in a housing, the apparatus comprising:
a piezoelectric sensor coupled to said permanent magnet machine to receive transmitted vibration produced by the fluctuations of the permanent magnet machine, said piezoelectric sensor producing a sensor signal corresponding to an amplitude of said vibration.
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2. An apparatus for sensing fluctuations in torque for a motor, the apparatus comprising:
a piezoelectric sensor disposed relative to said motor to receive a transmitted reaction force from the motor, said piezoelectric sensor producing a sensor signal corresponding to an amplitude of said reaction force. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for mitigating fluctuations in torque for a motor, the apparatus comprising:
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a piezoelectric sensor that receives a transmitted reaction force from the motor, said piezoelectric sensor producing a sensor signal corresponding to an amplitude of said reaction force;
a feedback mechanism coupled to said sensor for receiving said sensor signal and to said motor, said feedback mechanism supplying a current control signal to the motor based on said sensor signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of reducing torque ripple in a motor, the method comprising the steps of:
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providing a piezoelectric sensor in a position relative to the motor to receive rotational reaction forces transmitted by the motor due to torque ripple and generate a sensor signal correlating to an amplitude of said rotational reaction forces;
processing said sensor signal to produce a control signal including commanded current harmonics;
supplying said control signal to a current controller of the motor to reduce the torque ripple. - View Dependent Claims (26, 27)
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Specification