Method and apparatus for controlling AC motor

Details Method and apparatus for controlling AC motor Method and apparatus for controlling AC motor

1982-01-25

1984-05-29

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318806, H02P 126, H02P 128, H02P 130

Patent

active

044511124

ABSTRACT:
A method and apparatus for controlling an induction motor, in which an AC power source is connected to the induction motor through a switch and a frequency converter, and the motor speed is controlled by controlling the output frequency and output voltage of the frequency converter. In the starting operation, the induction motor in a free-running state is supplied with an initial voltage in a given frequency which is expected to make the absolute value of the motor current minimum or near minimum, and then the supply voltage is increased gradually from the initial voltage with its frequency being retained at the given voltage. When the output frequency of the frequency converter reaches a predetermined value, the output frequency and voltage thereof are increased gradually with the ratio therebetween being maintained at a given value.

REFERENCES:
patent: 3819992 (1974-06-01), Opaz et al.
patent: 4047083 (1977-09-01), Plunkett
patent: 4259845 (1981-04-01), Norbeck
patent: 4311951 (1982-01-01), Walker et al.

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