Motor control system, particularly to reduce idling speed

Details Motor control system, particularly to reduce idling speed Motor control system, particularly to reduce idling speed

1975-01-28

1977-01-11

Rubinson, Gene Z.

Electricity: motive power systems

Alternating current commutating motors

Universal or a.c.-d.c. motors

318332, 318345F, 318345G, 318345H, 318459, 318474, H02P 736

Patent

active

040029590

ABSTRACT:
To reduce noise and idling speed of electric motors, particularly series motors, the speed-torque characteristic of the motor is dropped with respect to the loaded speed-torque characteristic, by sensing no-load operation of the motor and deriving a sensed signal, the sensed signal being applied to controlled switches to abruptly change the effective voltage applied to the motor between values corresponding to the no-load speed-torque characteristic, or the load speed-torque characteristic and resulting in the desired speed, in dependence on the value of the sensed signal. Preferably, the operating condition of the motor is sensed by an inductive transducer, and a speed change is obtained by phase control, or half-wave rectification.

REFERENCES:
patent: 3292069 (1966-12-01), Evans, Jr.
patent: 3331004 (1967-07-01), Brown
patent: 3336517 (1967-08-01), Cain
patent: 3379950 (1968-04-01), Friedline
patent: 3559019 (1971-01-01), Kato

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