Process for driving an alternating-current motor and an alternat

Details Process for driving an alternating-current motor and an alternat Process for driving an alternating-current motor and an alternat

1989-12-04

1991-06-04

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318810, H02P 763

Patent

active

050217267

ABSTRACT:
Method and apparatus for driving an alternating-current motor. A sinusoidal supply AC voltage is rectified into a pulsating, unsmoothed DC voltage, with sinusoidal half waves and from this DC voltage an alternating-current motor voltage is produced by means of controllable polarity reversal. The pulse width of this alternating-voltage of the motor can be modulated. The polarity reversal takes place in accordance with the supply frequency in such a way that the AC voltage of the motor is essentially composed of the sinusoidal half waves of the pulsating DC voltage. For this purpose, the motor speed can be altered by changing the AC voltage of the motor with a constant timing frequency, lying outside the range of audibility, into pulse-width modulatable voltage pulses.

REFERENCES:
patent: 4233549 (1980-11-01), Dighe
patent: 4390826 (1983-06-01), Erdman et al.
patent: 4465961 (1984-08-01), Landino
patent: 4581696 (1986-04-01), Gyugyi et al.
patent: 4689543 (1987-08-01), Hucker
patent: 4769581 (1988-09-01), Rilly
patent: 4780652 (1988-10-01), Rilly

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