Motor control device and compressor

Details Motor control device and compressor Motor control device and compressor

2008-06-16

2011-12-27

Benson, Walter (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S400020, C318S461000, C318S727000, C318S768000, C318S801000, C318S807000, C318S811000

Reexamination Certificate

active

08084976

ABSTRACT:
A motor control device performing vector control for a motor that drives a load whose load torque varies periodically. The motor control device has: a motor speed deriving portion estimating or detecting a motor speed; a speed controller producing a specified torque current value such that the motor speed is made to follow a specified motor speed value fed from outside; a resonance filter producing a corrected torque current value by receiving a control value that varies with variations in the load torque and emphasizing a periodic variation component of the control value; a torque current corrector producing a specified superimposed torque current value by superimposing the corrected torque current value on the specified torque current value; and an adjusting portion adjusting, based on the specified superimposed torque current value, a degree of emphasis placed on the variation component by the resonance filter. The vector control is performed according to the specified superimposed torque current value.

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Hida et al.; “Position Sensorless Vector Control for Permanent Magnet Synchronous Motors Based on Maximum Torque Control Frame”; Industry Applications Society of the Institute of Electrical Engineers of Japan; included in Collection of the Lecture Treatises at 2006 Annual Conference of the Industry Applications Society of the Institute of Electrical Engineers of Japan; pp. 385-388 (I-385-I-388); Aug. 2006.

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