SPEED CONTROL SYSTEM FOR SERVO MOTORS

Title:

SPEED CONTROL SYSTEM FOR SERVO MOTORS

Document Type and Number:

WIPO Patent Application WO/1986/004194

Kind Code:

A1

Abstract:

In a speed control system for servo motors, the speed is controlled by using an observer which obtains a speed detect value while presuming the load torque of the motor. Even in a low-speed region of the motor where the resolving power of a rotary encoder is not sufficiently high, the resolving power is compensated to increase the speed detecting precision in the low-speed region. In a high-speed region of the motor, the speed processing is performed by the output of the rotary encoder by taking the processing time of CPU into consideration. Namely, to use or not to use the observer that obtains a presumed value of speed is determined depending upon the speed of the motor.

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Inventors:

KURAKAKE MITSUO (JP)
SAKAMOTO KEIJI (JP)
TOYASAWA YUKIO (JP)

Application Number:

PCT/JP1986/000010

Publication Date:

July 17, 1986

Filing Date:

January 11, 1986

Export Citation:

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Assignee:

FANUC LTD (JP)

International Classes:

H02P29/00; G05B19/23; G05B19/416; (IPC1-7): H02P5/00

Foreign References:

JPS59194689A	1984-11-05
JPS59117478A	1984-07-06

Other References: