Output circuit and brushless motor using the same

Details Output circuit and brushless motor using the same Output circuit and brushless motor using the same

1984-01-10

1985-08-13

Shoop, William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 323277, 323315, H02P 602, G05F 156

Patent

active

045352763

ABSTRACT:
An output circuit to drive a current into a load. Collector voltage of a current controlling transistor is automatically adjusted to maintain h.sub.FE of the transistor constant, whereby saturation of the transistor and excessive power consumption are avoided. A brushless motor using the output circuit. Current detectors detect emitter current and base current of output transistors and h.sub.FE of the transistors are kept constant, whereby excessive torque loss and harmful vibration are avoided. A limiter limits excessive torque control to prevent power transistor saturation. A switching mode power supply adjusts the collector voltage of the transistor in a feedback loop to keep h.sub.FE constant.

REFERENCES:
patent: 3714512 (1973-01-01), Grabowski
patent: 3723774 (1973-03-01), Rogers
patent: 4035700 (1977-07-01), Kawasaki et al.
patent: 4315207 (1982-02-01), Apfel
patent: 4376261 (1983-03-01), Heide et al.
patent: 4442397 (1984-04-01), Ishikawa et al.
patent: 4447771 (1984-05-01), Whited

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