Induction motor controller

Details Induction motor controller Induction motor controller

1984-12-11

1986-12-16

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Power-factor control

318812, H02P 540

Patent

active

046299602

ABSTRACT:
A motor control apparatus is disclosed for controlling and reducing power consumption of a 3-phase induction motor, wherein the motor control apparatus includes control means for controlling current flow in each phase line and voltage sensing means across each control means for sensing back emf when the control means is electrically open in order to measure slip of the motor. A reference voltage signal representative of line voltage is subtracted from the summed back emf measurements in order to provide a voltage control signal which is a function of motor slip. Current measurement means in the form of a current transformer associated with one supply line is provided for measuring current drawn by the motor. The voltage control signal and the current signal are processed to develop a phase control signal for controlling a phase control means and a driver means associated with each control means. A starting control means for providing a soft start for the induction motor is also disclosed.

REFERENCES:
patent: 4117408 (1978-09-01), Comstedt
patent: 4298834 (1981-11-01), Opfer
patent: 4469998 (1984-09-01), Nola

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