Method and apparatus for operating DC motors at high efficiency

Details Method and apparatus for operating DC motors at high efficiency Method and apparatus for operating DC motors at high efficiency

1979-02-05

1981-01-27

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318405, 318493, H02P 516

Patent

active

042478073

ABSTRACT:
Operation of a separately excited DC motor at maximum efficiency is achieved by continuously varying armature and field current in accordance with an operator-commanded motor torque amplitude signal. Armature current is varied in accordance with its magnitude of deviation from an armature current command signal which is generated in accordance with a predetermined relationship between the operator-commanded torque amplitude signal and field current. Field current is simultaneously varied in accordance with its magnitude of deviation from a field current command signal which is generated in accordance with magnitude of the armature current command signal. Since the motor is thus provided with the optimum field at all times, maximum motor efficiency is achieved irrespective of loading or speed.

REFERENCES:
patent: 4037144 (1977-07-01), Ohmae et al.

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