Method of protecting motor against overload and motor control de

Details Method of protecting motor against overload and motor control de Method of protecting motor against overload and motor control de

1991-10-23

1992-12-08

Wysocki, A. Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 23, H02H 708

Patent

active

051701065

ABSTRACT:
A method of protecting a motor against overload, wherein a voltage of the motor is transformed into a pulse in a manner avoiding influence from the toque of motor, and such pulse having a width is compared with a motor revolution number so as to output an overload detection signal. The overload detection signal in excess of a present value is detected to stop the motor. A motor control device is also provided for that purpose, which includes a chopping wave generator circuit, an operational amplifier and a gate circuit.

REFERENCES:
patent: 4327391 (1982-04-01), Grzebielski
patent: 4532567 (1985-07-01), Kade
patent: 4574226 (1986-03-01), Binder
patent: 4810943 (1989-03-01), Kawaguchi et al.
patent: 4945278 (1990-07-01), Nakashima
patent: 4955069 (1990-09-01), Ionescu
patent: 4985666 (1991-01-01), Nakabayashi

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