Motor drive apparatus having oscillation-reducing control...

Details Motor drive apparatus having oscillation-reducing control... Motor drive apparatus having oscillation-reducing control...

2007-04-03

2007-04-03

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S599000, C318S811000

Reexamination Certificate

active

11223917

ABSTRACT:
Under oscillation-reducing control executed while PWM control is performed, an oscillation-reducing torque that is opposite in phase to a varying component of the motor revolution number is generated and, a final torque command value that is the sum of the oscillation-reducing torque and a torque command value is used to drive an AC motor. In a transition state where the PWM control mode is switched to overmodulation control mode, the oscillation-reducing torque that is determined by multiplying an oscillation-reducing torque by a correction coefficient that varies depending on a modulation factor gradually decreases as the correction coefficient decreases and substantially becomes zero when the control mode is switched. Thus, the oscillation-reducing torque has no stepped portion that occurs in the oscillation-reducing torque when the control mode is switched. Thus, oscillations in output torque of the AC motor can be reduced.

REFERENCES:
patent: 5587891 (1996-12-01), Nakata et al.
patent: 7012389 (2006-03-01), Kobayashi et al.
patent: 7049779 (2006-05-01), Chen et al.
patent: 2005/0046369 (2005-03-01), Kobayashi et al.
patent: 2006/0119297 (2006-06-01), Okamura et al.
patent: 09-238492 (1997-09-01), None
patent: 2000-358393 (2000-12-01), None

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