Commutatorless DC motor drive device

Details Commutatorless DC motor drive device Commutatorless DC motor drive device

1981-08-17

1983-09-06

Truhe, J. V.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2900

Patent

active

044031742

ABSTRACT:
A commutatorless DC motor drive device in which errors due to offset voltages of differential amplifiers used therein are eliminated to thereby cause the rotor to rotate at a stable speed. Double-balance differential amplifier circuits are arranged to receive outputs of corresponding magnetic sensitive elements, such as HALL elements, upon differential input terminals thereof and external control signals upon differential control voltage terminals thereof. The outputs from the magnetic sensitive elements are amplified with an amplification factor determined by the control signals. The control signals have an amplitude determined in accordance with the rotational speed of the rotor. Output circuits control the amount of current fed to the stator coils in accordance with differential outputs of the double-balance differential amplifier circuits.

REFERENCES:
patent: 3684974 (1972-08-01), Solomon et al.
patent: 4135120 (1979-01-01), Hoshimi et al.

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