Speed control device for transistor motor

Details Speed control device for transistor motor Speed control device for transistor motor

1974-10-21

1976-05-25

Schaefer, Robert K.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, H02K 2900

Patent

active

039597008

ABSTRACT:
A speed control device for a transistor motor having a stator provided with a plurality of field windings and a rotor consisting of a permanent magnet comprises position detecting means for detecting the position of the rotor, a plurality of driving transistors whose emitter-collector circuits are respectively connected in series to the field windings and whose bases are respectively supplied with the output from the position detecting means, a base current control transistor for the driving transistors whose emitter-collector circuit is connected through diodes to the respective bases of the driving transistors, and a servo circuit for maintaining the base current control transistor to be inoperative during the starting period of the transistor motor and, as the transistor motor approaches a specified rotation speed, controlling the base current of the driving transistors in accordance with a speed control signal.

REFERENCES:
patent: 3667019 (1972-05-01), Elliott et al.
patent: 3688172 (1972-08-01), Sieber
patent: 3806785 (1974-04-01), DeValroger et al.
patent: 3864610 (1975-02-01), Kawamoto
patent: 3903463 (1975-09-01), Kanamori

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