Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1974-12-16
1976-07-13
Robinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318240, H02P 762
Patent
active
039696596
ABSTRACT:
A system including an alternating current electric motor of the wound rotor type wherein the speed of the motor is controlled and its starting current is limited, is disclosed. A plurality of phase regulated SCR devices control the amount of resistance in the rotor winding circuits. A control voltage representing the difference between a desired motor speed and the actual motor shaft speed is supplied to an analog to digital converter which produces a multi-bit digital signal which controls the SCR devices so as to control rotor current in incremental steps. A vernier control signal is obtained by converting the digital signals back into analog form and comparing the control signal with the converted analog signal through the use of a difference amplifier circuit in a vernier amplifier. During start up, when the motor is brought up to speed and until the motor speed is close to the predetermined speed, the digital signal from the analog to digital converter is inhibited causing the SCR-resistor current paths in the rotor winding circuits to become open circuited. Another SCR-resistor vernier path which is connected to the rotor windings is operated by the vernier control signal to control the rotor current so as to provide for smooth low current starts as well as to control current in the rotor windings between the digitally controlled incremental steps.
REFERENCES:
patent: 2924765 (1960-02-01), Lee
patent: 3227937 (1966-01-01), Koppelmann et al.
patent: 3657622 (1972-04-01), Reuland et al.
General Dynamics Corporation
Kacher Martin Lu
Robinson Gene Z.
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