Compensating system and method for cogging torque of motor

Details Compensating system and method for cogging torque of motor Compensating system and method for cogging torque of motor

2009-04-02

2011-11-15

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400250, C318S128000, C318S460000

Reexamination Certificate

active

08058828

ABSTRACT:
A compensating system for compensating a cogging torque of a motor includes a speed measuring apparatus, a moment of inertia measuring apparatus, a rotor position sensor, a processor, a plurality of band-pass filters, and a current control apparatus. The processor receives a speed, a moment of inertia, and a rotor position of the motor, to determine the cogging torque of the motor. Each band-pass filter is arranged with a different frequency to filter different frequencies of waveforms of the cogging torque. The processor determines a Fourier transformation of the cogging torque according to a number of Fourier coefficients from the band-pass filters, a cogging torque at a preset rotor position, and a cogging current according to the Fourier transformation of the cogging torque. The current control apparatus outputs a current opposite to the cogging current, to compensate the cogging torque of the motor.

REFERENCES:
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patent: 6690137 (2004-02-01), Iwaji et al.
patent: 6838854 (2005-01-01), Inagaki et al.
patent: 7117754 (2006-10-01), Neely et al.
patent: 7568778 (2009-08-01), Terada et al.

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