초록 ▼

A motor speed control apparatus is provided in which the controllable frequency band of the control system can be sufficiently enhanced with a comparatively simple structure even if the frequency generator equipped into the motor is low in output frequency and the rotational accuracy can be highly i

A motor speed control apparatus is provided in which the controllable frequency band of the control system can be sufficiently enhanced with a comparatively simple structure even if the frequency generator equipped into the motor is low in output frequency and the rotational accuracy can be highly improved even if the disturbance of high frequency components of load torque is applied to the motor. The frequency band of the control system can be improved by using the estimated speed signal as the speed feedback signal. A motor speed control apparatus superior in disturbance control characteristic can be realized through the feed forward compensation of an estimated load torque.

대표청구항 ▼

[ What is claimed is:] [1.] A motor speed control apparatus comprising:a frequency generator for generating a frequency signal which is proportional to a rotating speed of a motor;a period detector for detecting a period of the frequency signal and for outputting a mean speed signal which is proport

[ What is claimed is:] [1.] A motor speed control apparatus comprising:a frequency generator for generating a frequency signal which is proportional to a rotating speed of a motor;a period detector for detecting a period of the frequency signal and for outputting a mean speed signal which is proportional to a mean rotating speed of the motor;a controller for receiving an externally supplied speed command signal and a speed feedback signal, and for performing a control operation to output a control signal;a driver for supplying the motor with a driving current in accordance with the control signal;a speed estimator for receiving the control signal and the mean speed signal, and for estimating a rotating speed of the motor from the control signal and the mean speed signal to thereby obtain an estimated speed signal of the motor which is outputted to said controller as the feedback signal, wherein said speed estimator includes:a predictor which comprises:a multiplier for comparing an estimated mean speed signal obtained by integrating the estimated speed signal with respect to time and the mean speed signal to generate a mean speed error, and for multiplying the mean speed error by a factor (1+.varies.), wherein .varies. is a real number;a delay circuit for multiplying an output of a subtractor by the factor .varies., and for delaying the output by a time equal to a period of the frequency signal;said subtractor for subtracting an output of said delay circuit from an output of said multiplier thereby generating a predicted value of an instantaneous speed error from the mean speed error; anda feedback loop for correcting the estimated speed signal by the predicted value generated by said predictor.