Control device for pulse motors, having a fail safe function

Details Control device for pulse motors, having a fail safe function Control device for pulse motors, having a fail safe function

1981-08-25

1983-02-01

Truhe, J. V.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 123440, H02K 2904

Patent

active

043718221

ABSTRACT:
A control device for a pulse motor having a plurality of polyphase stator coils, which includes a driving circuit having a plurality of power transistors arranged for sequentially energizing the stator coils, an abnormality detecting circuit arranged for comparing the input and output levels of the transistors to produce an output when the two levels are out of an inverted relationship, and a timer circuit arranged for producing a fault signal when the output of the abnormality detecting circuit is continuously produced over a predetermined period of time. The pulse motor control device may also include an alarm device and a safety device, both responsive to the output of the timer circuit to give the alarm and render the power transistors inoperative, respectively.

REFERENCES:
patent: 3801975 (1974-04-01), Kitano
patent: 4321643 (1982-03-01), Vernier

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