Motor apparatus

Details Motor apparatus Motor apparatus

1982-07-28

1985-04-09

Weldon, Ulysses

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345B, 318345F, 318459, 318326, G05B 500

Patent

active

045104239

ABSTRACT:
A motor apparatus includes a motor, a first circuit for sensing a back electromotive force of the motor to provide a first signal, a second circuit for sensing a rotation speed of the motor to provide a second signal, a third circuit responsive to the first and second signals to provide a third signal corresponding to the first and second signals, and a fourth circuit for feeding to the motor a drive current with a magnitude corresponding to the third signal.
The motor and the first to fourth circuits jointly form a negative feedback loop for setting up a proportional relationship of the second signal to the product of rotation speed and output torque of the motor. The second circuit changes the second signal proportionally to the rotation speed of the motor.

REFERENCES:
patent: 3475672 (1969-10-01), Oltendorf
patent: 3543115 (1970-11-01), Grygera
patent: 3599063 (1971-08-01), Nanai et al.
patent: 4097789 (1978-06-01), Doemen
patent: 4163182 (1979-07-01), Tanikoshi
patent: 4215298 (1980-07-01), William, Jr. et al.
W. L. McDougal et al., Direct Current Motors and Generators, American Technical Society, Chicago, pp. 255-263, 1947.
J.S.C. Tan, D.C. Servo-System with Torque Feedback, Control, 12/68.

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