DETECTING POSITION MEASUREMENT ERRORS IN AN ELECTRIC MOTOR SYSTEM
First Claim
1. A system for controlling an electric motor, the system comprising:
- a position sensor configured to measure a position of a rotor of the electric motor;
an error detector configured to detect an offset between the position measured by the position sensor and an actual position of the rotor, the error detector including;
a signal injector configured to inject a probing signal to a stator of the electric motor, wherein the probing signal includes a high frequency current signal; and
a signal sampler configured to sample a response signal from the stator of the electric motor;
wherein the error detector is configured to derive the offset based on the response signal; and
a current regulator, wherein;
the signal injector is configured to inject the probing signal by inputting a current command in a reference frame to the current regulator; and
the signal sampler is configured to sample the response signal by receiving a voltage command in the reference frame from the current regulator.
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Accused Products
Abstract
Systems and methods are disclosed for detecting position measurement errors for an electric motor. An exemplary system may include a position sensor configured to measure a position of a rotor of the electric motor. The system may also include an error detector configured to detect an offset between the position measured by the position sensor and an actual position of the rotor. The error detector may include a signal injector configured to inject a probing signal to a stator of the electric motor. The error detector may also include a signal sampler configured to sample a response signal from the stator of the electric motor. The error detector may be configured to derive the offset based on the response signal.
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Citations
20 Claims
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1. A system for controlling an electric motor, the system comprising:
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a position sensor configured to measure a position of a rotor of the electric motor; an error detector configured to detect an offset between the position measured by the position sensor and an actual position of the rotor, the error detector including; a signal injector configured to inject a probing signal to a stator of the electric motor, wherein the probing signal includes a high frequency current signal; and a signal sampler configured to sample a response signal from the stator of the electric motor; wherein the error detector is configured to derive the offset based on the response signal; and a current regulator, wherein; the signal injector is configured to inject the probing signal by inputting a current command in a reference frame to the current regulator; and the signal sampler is configured to sample the response signal by receiving a voltage command in the reference frame from the current regulator. - View Dependent Claims (2, 4, 6, 7, 8)
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3. (canceled)
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5. (canceled)
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9. A method for detecting position measurement errors for an electric motor, the method comprising:
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measuring, by a position sensor, a position of a rotor of the electric motor; injecting a probing signal to a stator of the electric motor by inputting a current command in a reference frame to a current regulator, wherein the probing signal includes a high frequency current signal; sampling a response signal from the stator of the electric motor by receiving a voltage command in the reference frame from the current regulator; and deriving, based on the response signal, an offset between the position measured by the position sensor and an actual position of the rotor. - View Dependent Claims (10, 12, 14, 15, 16)
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11. (canceled)
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13. (canceled)
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17. A motor system, comprising:
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an electric motor including a rotor and a stator; and a motor control system configured to control the electric motor, the motor control system including; a position sensor configured to measure a position of the rotor; an error detector configured to detect an offset between the position measured by the position sensor and an actual position of the rotor, the error detector including; a signal injector configured to inject a probing signal to the stator, wherein the probing signal includes a high frequency current signal; and a signal sampler configured to sample a response signal from the stator; wherein the error detector is configured to derive the offset based on the response signal; and a current regulator, wherein; the signal injector is configured to inject the probing signal by inputting a current command in a reference frame to the current regulator; and the signal sampler is configured to sample the response signal by receiving a voltage command in the reference frame from the current regulator. - View Dependent Claims (18, 19)
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20. A chassis for a vehicle, the chassis comprising:
a propulsion system for providing motive torques to at least one wheel of the vehicle, the propulsion system comprising; an energy storage device configured to store electric energy; an electric motor including a rotor and a stator; and a motor control system configured to control energy transfer between the energy storage device and the electric motor, the motor control system including; a position sensor configured to measure a position of the rotor; an error detector configured to detect an offset between the position measured by the position sensor and an actual position of the rotor, the error detector including; a signal injector configured to inject a probing signal to the stator, wherein the probing signal includes a high frequency current signal; and a signal sampler configured to sample a response signal from the stator; wherein the error detector is configured to derive the offset based on the response signal; and a current regulator, wherein; the signal injector is configured to inject the probing signal by inputting a current command in a reference frame to the current regulator; and the signal sampler is configured to sample the response signal by receiving a voltage command in the reference frame from the current regulator.
Specification