Apparatus for controlling ac motor

Details Apparatus for controlling ac motor Apparatus for controlling ac motor

1980-01-07

1982-05-04

Shoop, William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

363 37, 363 79, H02P 534

Patent

active

043284540

ABSTRACT:
A first PWM inverter for converting the ac voltage of an ac power source to a dc voltage is connected through a dc circuit with a second PWM inverter for driving an ac motor. A smoothing capacitor is provided in the dc circuit. The firing angles of the first inverter are so controlled that the voltage in the dc circuit may be kept at a predetermined value and the second inverter is controlled in accordance with the speed instruction signal for the ac motor, whereby the ac motor can operate a regenerative operation without inducing higher harmonic components.

REFERENCES:
patent: 4158163 (1979-06-01), Eriksen et al.
patent: 4188663 (1980-02-01), Okawa et al.
patent: 4238821 (1980-12-01), Walker

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