Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1980-01-28
1981-09-22
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
H02P 516
Patent
active
042912601
ABSTRACT:
Motor velocity is controlled in accordance with the difference between a motor velocity command signal and an actual motor velocity signal related to the magnitude of motor back emf. Connected to the windings of a motor, usually the armature winding, is a velocity detector that samples and stores the back emf as the actual motor velocity signal. This actual motor velocity signal is compared with the motor velocity command signal in a differential command amplifier that generates a motor drive signal to an output stage. The output stage responds to the motor drive signal to connect a voltage to windings of the motor during a motor drive time. The sample time interval of the motor velocity detector and the motor drive time of the output stage are established by the output of an asymmetrical square wave generator providing a sample time interval signal and a motor drive time signal.
REFERENCES:
patent: 3504260 (1970-03-01), Staples
patent: 3588654 (1971-06-01), Balazs
patent: 3708737 (1973-01-01), Johnson
patent: 3803470 (1974-04-01), Vosteen
patent: 3952237 (1976-04-01), Kimizuka
patent: 3976926 (1976-08-01), Egbert
Paris, F. "Motor Spee Control" Electrical Engineering Times, Jan. 10, 1977, pp. 15-16.
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