Pulse width modulation system for AC motor drive inverters

Details Pulse width modulation system for AC motor drive inverters Pulse width modulation system for AC motor drive inverters

1986-11-14

1988-01-19

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 96, 318811, H02M 7757

Patent

active

047207779

ABSTRACT:
A pulse width modulation system for AC motor drive inverters consists of a ROM for storing data of values of cos .theta. and cos(.theta.-.pi./3) with respect to a phase .theta. in the range of electrical angle of 60.degree., a programmable counter for counting the phase .theta., an operational circuit for performing logical operations to evaluate each period of time for which a three phase AC motor is energized in accordance with each switching pattern, and a programmable timer for counting each period of time for which the motor is energized in accordance with each switching pattern. The motor is energized in accordance with each switching pattern for the period of time the data of which is gained at the operational circuit so that three phase output voltage resultant vectors form a circular locus.

REFERENCES:
patent: 4321518 (1982-03-01), Akamatsu
patent: 4447786 (1984-05-01), Saar et al.
patent: 4587605 (1986-05-01), Kouyama et al.
Conference Record of International Power Electronics Conference; (1983); pp. 407-417.

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