Drive control system for motors

Details Drive control system for motors Drive control system for motors

1980-10-27

1983-05-31

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

364474, 318 39, 318 70, G05B 1925

Patent

active

043863051

ABSTRACT:
A motor drive control system for use in a machine tool having spindle and feed shaft motors. If the spindle motor, which is rotating at a constant speed during a machining operation, is subjected to an overload, and consequently experiences a drop in speed, this fact is detected by a detector for detecting the armature current of the spindle motor. The feed shaft motor is slowed down to a predetermined speed if the overloaded condition continues for a prescribed period of time. The feed shaft motor is stopped if an even greater armature current is detected to be flowing due to a continuing overload despite the fact that the feed shaft motor has been slowed to the predetermined speed.

REFERENCES:
patent: 2491983 (1949-12-01), King et al.
patent: 3962619 (1976-06-01), Nishimura et al.
patent: 4131837 (1978-12-01), Whetham
patent: 4208718 (1980-06-01), Chung
patent: 4237408 (1980-12-01), Frecka
patent: 4279013 (1981-07-01), Cameron et al.
Control Engineering, vol. 11, No. 8, Aug. 1964, New York, (U.S.), R. Semi, "Numerically Controlled Miller Optimizes Own Production", pp. 93-95.
Product Eng., vol. 40, No. 16, Aug. 11, 1969, New York, (U.S.), "Simple Adaptive Control Reduces Tool Breakage", p. 74.

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