System and method for controlling an AC traction motor without sensing motor rotation speed
First Claim
1. A processor system for providing motor excitation frequency control in a vehicle having wheels propelled by AC electric traction motors respectively energized by one or more motor drives, the system comprising:
- a processor module comprising a first processor submodule for computing an excitation frequency signal respectively supplied to the one or more motor drives, the excitation frequency signal based on a sum of i) a signal indicative of a weighted average of an estimated rotor speed signal and a measured vehicle speed signal, and ii) a compensated slip command signal, the processor module further comprising a second processor submodule for computing an estimated slip signal based on respective measured motor current signals and the excitation frequency signal; and
a slip compensation module coupled to receive a slip command signal and further coupled to the processor module to supply the compensated slip command signal, the slip compensation module comprising a submodule for computing a slip compensation signal based on the estimated slip signal and the slip command signal.
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Accused Products
Abstract
A processor system and method are provided for providing motor excitation frequency control in a vehicle propelled by AC electric traction motors. The processor system and method allow for computing an excitation frequency signal based on a sum of i) a signal indicative of a weighted average of an estimated rotor speed signal and a measured vehicle speed signal and ii) a compensated slip command signal. Effective wheel slip control is thus provided without requiring sensors for measuring rotational speed of the traction motors.
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Citations
23 Claims
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1. A processor system for providing motor excitation frequency control in a vehicle having wheels propelled by AC electric traction motors respectively energized by one or more motor drives, the system comprising:
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a processor module comprising a first processor submodule for computing an excitation frequency signal respectively supplied to the one or more motor drives, the excitation frequency signal based on a sum of i) a signal indicative of a weighted average of an estimated rotor speed signal and a measured vehicle speed signal, and ii) a compensated slip command signal, the processor module further comprising a second processor submodule for computing an estimated slip signal based on respective measured motor current signals and the excitation frequency signal; and a slip compensation module coupled to receive a slip command signal and further coupled to the processor module to supply the compensated slip command signal, the slip compensation module comprising a submodule for computing a slip compensation signal based on the estimated slip signal and the slip command signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling motor excitation frequency in a vehicle having wheels propelled by AC electric traction motors respectively energized by one or more motor drives, the method comprising the steps of:
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computing an excitation frequency signal respectively supplied to the one or more motor drives, the excitation frequency signal based on a sum of I) a signal indicative of a weighted average of an estimated rotor speed signal and a measured vehicle speed signal, and ii) a compensated slip command signal; computing an estimated slip signal based on respective measured motor current signals and the excitation frequency signal; and computing a slip compensation signal based on a received slip command signal and the estimated slip signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A vehicle having a processor system for inhibiting wheel slip, the vehicle comprising:
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one or more AC electric traction motors coupled to propel the wheels of the vehicle; one or more motor drives coupled to energize the AC electric traction motors; and the processor system in turn comprising; a processor module comprising a first processor submodule for computing an excitation frequency signal respectively supplied to the one or more motor drives, the excitation frequency signal based on a sum of i) a signal indicative of a weighted average of an estimated rotor speed signal and a measured vehicle speed signal, and ii) a compensated slip command signal, the processor module further comprising a second processor submodule for computing an estimated slip signal based on respective measured motor current signals and the excitation frequency signal; and a slip compensation module coupled to receive a slip command signal and further coupled to the processor module to supply the compensated slip command signal, the slip compensation module comprising a submodule for computing a slip compensation signal based on the estimated slip signal and the slip command signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification