Method of starting variable-speed induction motor

Details Method of starting variable-speed induction motor Method of starting variable-speed induction motor

1983-09-29

1984-11-06

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318732, 318827, H02P 126

Patent

active

044814550

ABSTRACT:
This method of starting a variable-speed induction motor utilizes a speed control of the induction motor by varying the output frequency from a cycloconverter. The method comprises applying an output from the cycloconverter to the secondary winding of the induction motor while the primary winding of the induction motor is short-circuited during the start-up of the motor, applying a voltage lower than the line voltage to the primary winding when the induction motor is operating within an intermediate speed range, and applying the line voltage within a speed region near the rated speed. This method enables speed control over a wide range, and provides a sufficiently large start-up torque for the induction motor.

REFERENCES:
patent: 3683251 (1972-08-01), Pisecker
patent: 4039909 (1977-08-01), Baker
patent: 4074174 (1978-02-01), Kuge

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