Driving circuit for brushless D.C. motor

Details Driving circuit for brushless D.C. motor Driving circuit for brushless D.C. motor

1984-07-16

1985-08-13

Shoop, William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

045352747

ABSTRACT:
A driving circuit for a brushless motor having a permanent-magnetic rotor is disclosed which is capable of positively carrying out starting of the motor and rapidly interrupting exciting current to protect the motor, when the rotor fails to rotate during the normal operation. The driving circuit includes transistor control circuits each including a capacitor, a PUT, and a capacitor charging circuit comprising a Zener diode and a resistor; and a resistor series circuit for flowing conductive signal current to a transistor switch which serves to supply current to exciting windings. The PUT is conductive to allow the transistor switch to be kept non-conductive when the capacitor is charged to a predetermined voltage.

REFERENCES:
patent: 3873897 (1975-03-01), Muller
patent: 4099104 (1978-07-01), Muller
patent: 4359655 (1982-11-01), Fukui

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