Digital servo-control apparatus for preventing torque variations

Details Digital servo-control apparatus for preventing torque variations Digital servo-control apparatus for preventing torque variations

1991-03-22

1994-05-03

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318632, 318650, 318799, G05B 103, G05B 1302

Patent

active

053090756

ABSTRACT:
An apparatus for preventing torque variation in a digitally controlled servomotor. Electrical angles .theta..sub.1 and .theta..sub.2 of the exciting magnetic field or the armature coil at respective timings of detecting and controlling a load current are obtained. The current is dq-transformed with .theta..sub.1 and inverse-dq-transformed with .theta..sub.2. As a result, even if there is a displacement of the actual electrical angle owing to the rotation of the armature during computing, it is possible to execute accurate current control. Further, at the time of calibration of the control system, the load currents are detected to be dq-transformed. From the d-axis components and q-axis components, values related to the offset and the amplification factor of the current detection systems are calculated. During the actual operation of the servomotor, the detected current value is corrected using the values. Further, the detection of the load current is performed plural times in one control cycle. Thereupon, a statistical average value is obtained as the detected current. Accordingly, an undesirable variation of the output torque is prevented.

REFERENCES:
patent: 4074175 (1978-02-01), Born et al.
patent: 4088935 (1978-05-01), D'Arte et al.
patent: 4477762 (1984-10-01), Kurakake et al.
patent: 4774651 (1988-09-01), El-Ibiary et al.
patent: 4792742 (1989-12-01), Fujimoto et al.
patent: 4839819 (1989-06-01), Begin et al.
patent: 4868476 (1989-09-01), Respaut
patent: 4902950 (1990-02-01), Kawamura et al.
patent: 4967134 (1990-10-01), Losic et al.
patent: 5057759 (1991-10-01), Ueda et al.
patent: 5105137 (1992-04-01), Iijima
patent: 5159254 (1992-10-01), Teshima

Affiliated with

Also associated with

Rating

Digital servo-control apparatus for preventing torque variations does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital servo-control apparatus for preventing torque variations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital servo-control apparatus for preventing torque variations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2117257