Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1978-11-20
1980-10-07
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318331, 318459, H02P 100, H02P 516
Patent
active
042271274
ABSTRACT:
A motor speed control circuit includes a resistor, a voltage reference circuit, a first voltage comparator, a current mirror circuit for deriving first and second output currents according to the output of the first voltage comparator, and a motor. A voltage consisting of the sum of a reference voltage and a voltage generated across the resistor by the first output current of the current mirror circuit is applied to the first input terminal of the first voltage comparator. The second output current of the current mirror circuit is fed to the motor and to the second input terminal of the first voltage comparator. A second comparator detects the voltage difference between the first and second input terminals of the first voltage comparator. The output of the second comparator is applied to the current mirror circuit to enhance the starting torque of the motor.
REFERENCES:
patent: 3803471 (1974-04-01), Price et al.
patent: 3943380 (1976-03-01), Morgan et al.
patent: 3962592 (1976-06-01), Thommen et al.
patent: 3991323 (1976-11-01), Przybylski
patent: 4064448 (1977-12-01), Eatock
Fukaya Hirokazu
Kishi Jun
Nippon Electric Co. Ltd.
Smith Jr. David
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