AC motor controller with 180 degree conductive switches

Details AC motor controller with 180 degree conductive switches AC motor controller with 180 degree conductive switches

1993-08-26

1995-10-31

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318811, 318807, 318799, H02P 534

Patent

active

054633001

ABSTRACT:
An ac motor controller is operated by a modified time-switching scheme where the switches of the inverter are "on" for electrical-phase-and-rotation intervals of 180.degree. as opposed to the conventional 120.degree.. The motor is provided with three-phase drive windings, a power inverter for power supplied from a dc power source consisting of six switches, and a motor controller which controls the current controlled switches in voltage-fed mode. During full power, each switch is gated continuously for three successive intervals of 60.degree. and modulated for only one of said intervals. Thus, during each 60.degree. interval, the two switches with like signs are "on" continuously and the switch with the opposite sign is modulated.

REFERENCES:
patent: 4002958 (1977-01-01), Akamatsu
patent: 4212056 (1980-07-01), Kitamura et al.
patent: 4736148 (1988-04-01), Hirata

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