Adjustable speed electric motor drive having constant harmonic c

Details Adjustable speed electric motor drive having constant harmonic c Adjustable speed electric motor drive having constant harmonic c

1976-10-26

1978-10-31

Schaefer, Robert K.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318230, 318231, 318341, 363 41, 363 42, H02P 540, H02P 762

Patent

active

041236920

ABSTRACT:
An adjustable speed AC electric motor drive has a static inverter energized from a unidirectional power source through a semiconductor series chopper and eliminates a filter between chopper and inverter and controls the fundamental inverter output frequency as a function of an analog speed reference signal and also pulse width modulates the series chopper at a constant frequency as a function of the speed reference signal and synchronizes the series chopper to the fundamental inverter freqency to provide variable voltage and variable frequency power to the motor. The drive has a shunt chopper at the output of the series chopper and switches it to the opposite conductive state from the series chopper so that it coacts with the feedback diodes to form substantially continuous, low impedance, bidirectional free-wheeling paths for motor current and provides constant harmonic content current to the motor with reduced ripple.

REFERENCES:
patent: 3392316 (1968-07-01), Salihi
patent: 3617840 (1971-11-01), Salihi
patent: 3694718 (1972-09-01), Graf et al.
patent: 3815003 (1974-06-01), Wiart
patent: 3971972 (1976-07-01), Stich
patent: 4024444 (1977-05-01), Dewan et al.

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