Ac motor drive with switched autotransformer coupling

Details Ac motor drive with switched autotransformer coupling Ac motor drive with switched autotransformer coupling

1989-08-18

1990-06-19

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318780, 318771, 318711, H02P 528, H02P 112

Patent

active

049356860

ABSTRACT:
An ac drive in which the three phase ac current produced by a current controlled inverter is applied to the stator winding of a synchronous or induction motor through an autotransformer equipped with a neutral shorting switch. For starting from zero speed and operation at very low speeds below the speed at which the autotransformer could provide adequate volt-seconds for operation of the motor, the neutral shorting switch is opened so that the current is applied essentially directly to the stator. At normal and high speeds, the neutral shorting switch is closed so that the voltage to the motor stator is increased by the turns ratio of the autotransformer thereby increasing the speed range of the motor. By providing a number of sets of taps on the autotransformer each with a neutral shorting switch, the ac drive mimics the characteristics of a drive with a multi-ratio gear box.

REFERENCES:
patent: 774954 (1904-11-01), Scott
patent: 1280624 (1918-10-01), Alexanderson
patent: 3351835 (1964-11-01), Borden
patent: 3421062 (1969-01-01), Dickey
patent: 3527990 (1970-09-01), Gasser
patent: 3560834 (1971-02-01), Stoutmann
patent: 4644242 (1987-02-01), Takata et al.
patent: 4766359 (1988-08-01), Smith et al.

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