Method and apparatus for controlling and regulating a motor with

Details Method and apparatus for controlling and regulating a motor with Method and apparatus for controlling and regulating a motor with

1980-12-08

1984-11-20

Truhe, J. V.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 368157, H02K 2904

Patent

active

044841230

ABSTRACT:
A method and an apparatus for controlling and regulating an electrical motor, especially a reactive motor for time-keeping devices such as clocks. The motor has a permanent-magnetic rotor with at least two poles, and a stator with at least two coils. In a normal speed mode one of coils is supplied with driving pulses whereas the second coil senses the rotational speed of the rotor. If the rotational speed of the rotor falls below a predetermined value, a self-starting mode is initiated wherein the first and second coils are alternately supplied with driving pulses. In this self-starting mode the frequency of the pulses supplied to the first and second coils is increased until normal speed has been reached wherein the self-starting mode is switched off and the normal speed mode regulation is switched on.

REFERENCES:
patent: 3611081 (1971-10-01), Watson
patent: 4250544 (1981-02-01), Alley
Glaser, G., The Technology of Quartz Watches, Wilhelm Kempter KG 1979, pp. 142-161.

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