Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1974-10-29
1976-03-23
Dobeck, Benjamin
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318312, 318345, H02P 700
Patent
active
039462951
ABSTRACT:
A sonar flasher motor speed control for driving a D.C. electric motor from a varying voltage source. A rotating magnet and coil system generates a first voltage pulse once each revolution of the motor. A capacitor charged through a series resistor in combination with transistor means controlled by the first voltage pulse to generate a ramp voltage once each cycle. The ramp voltage is compared with a reference voltage by means of a voltage comparator, which generates a control second voltage pulse, whenever the ramp voltage exceeds the reference voltage. Transistor amplifier means responsive to said second voltage pulse increases the motor current during the second pulse so as to maintain the speed of the motor relatively constant.
REFERENCES:
patent: 3373331 (1968-03-01), Dow
patent: 3757193 (1973-09-01), Inaba
patent: 3796939 (1974-03-01), Raggi
patent: 3845375 (1974-10-01), Stiebel
patent: 3855511 (1974-12-01), Smith
Dobeck Benjamin
Lowrance Electronics, Inc.
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