Motor control system

Details Motor control system Motor control system

1979-11-09

1982-06-08

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318798, H02P 540

Patent

active

043341829

ABSTRACT:
A motor speed control system (controller) for controlling the speed of an AC motor. The invention provides sufficient voltage at low motor speeds to overcome the high resistance of fractional H.P. motors, which effects low speed operation, i.e., the ability to provide constant load torque. With the present invention an output frequency voltage offset is provided in a non-linear fashion so that desired load torque is developed over the entire speed range of the control system.

REFERENCES:
patent: 3402336 (1968-09-01), Risberg
patent: 3594623 (1971-07-01), Lamaster
patent: 3819992 (1974-06-01), Opal
patent: 3971972 (1976-07-01), Stich
patent: 4099108 (1978-07-01), Okawa et al.

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