Motor speed control device

Details Motor speed control device Motor speed control device

1997-12-18

2000-04-11

Shoop, Jr., William M.

Electricity: motive power systems

Constant motor current, load and/or torque control

318254, 318439, 318599, 318138, H02P 700

Patent

active

060491825

ABSTRACT:
A sinusoidal wave data stream for correcting a torque ripple of a motor is stored in a torque ripple corrective memory. As the motor rotates, rotational angle information is computed from a rotational pulse signal and a rotor magnetic pole position pulse signal, which are generated accompanying the rotation. A sinusoidal wave data corresponding to the rotational angle information is recalled. Then, the sinusoidal wave data constituting a torque ripple corrective signal is subtracted from a motor control signal. With the use of the motor control signal after the subtraction, the motor is driven and controlled. With this arrangement, the motor torque ripple, which is a main cause of speed fluctuation of a polyphase brushless motor, is suppressed and stable and precise motor speed control is achieved.

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Nakatani et al., "Development of Low-Speed Tape Transfer Technology for VCR"; Precision Technology Development Center, Production Technology Development Group, Sharp Corporation, 1997.

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