Motor speed control apparatus for keeping the speed of the motor

Details Motor speed control apparatus for keeping the speed of the motor Motor speed control apparatus for keeping the speed of the motor

1993-11-17

1995-11-14

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318432, 388820, H02K 2910

Patent

active

054670047

ABSTRACT:
A motor control apparatus controls a motor speed according to a detected period of a frequency signal whose frequency is in proportion to the motor speed and drives the motor so as to keep its speed fixed according to a drive signal. The motor control apparatus includes a disturbance torque observer receptive to the drive signal and the detected period which produces a estimated disturbance signal corresponding to a conversion of a disturbance torque into an electrical signal. A comparator produces a period error signal which is a difference between the detected period and a desired period. An arithmetic unit produces the control signal in accordance with the period error signM. A torque correcting unit produces the drive signal by adding the estimated disturbance signal to the control signal.

REFERENCES:
patent: 4143311 (1979-03-01), Lee
patent: 4360767 (1982-11-01), Akiyama et al.
patent: 5144210 (1992-09-01), Sato
patent: 5298841 (1994-03-01), Katayama et al.

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