Position control unit for electric motor

Details Position control unit for electric motor Position control unit for electric motor

1996-08-16

1999-03-23

Martin, David

Electricity: motive power systems

Positional servo systems

Multiple mode systems

31856817, 31856822, 318632, G05B 1300

Patent

active

058864911

ABSTRACT:
The present invention provides a position control unit having a torque command computing device (a position control circuit, and a speed control circuit) for outputting a torque command signal (q-axis current command signal Iq*) according to a positional command signal .theta.m* given from the outside and a positional detection signal .theta.m for an electric motor, and a torque control device (current control circuit) for controlling a torque of the electric motor according to a torque command signal outputted from the torque command computing device, in which the torque control device selects a gain Kqp or a gain Kqi according to whether an absolute value of a positional deviation between the positional command signal .theta.m* and the positional detection signal .theta.m is larger or smaller than a gain switching reference value P for a positional deviation.

REFERENCES:
patent: 4810941 (1989-03-01), Ohishi et al.
patent: 4988935 (1991-01-01), York
patent: 5175479 (1992-12-01), Tajima et al.
patent: 5194798 (1993-03-01), Hashimoto et al.
patent: 5204932 (1993-04-01), Shinohara et al.
patent: 5475291 (1995-12-01), Yoshida et al.
patent: 5652495 (1997-07-01), Narazaki et al.

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