Variable speed control apparatus for induction motor

Details Variable speed control apparatus for induction motor Variable speed control apparatus for induction motor

1976-08-20

1978-07-04

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318231, H02P 540

Patent

active

040991083

ABSTRACT:
An induction motor is operated by a power supply of variable voltage and variable frequency. The voltage and frequency of the variable-voltage variable-frequency power supply is changed by a control circuit to accelerate or decelerate the induction motor. For slowly controlling the speed of the induction motor, the ratio of the output voltage to the output frequency of the variable-voltage variable-frequency power supply is maintained substantially constant. The control circuit includes a voltage correcting means which, in response to a command for sudden acceleration or deceleration of the speed of the motor, corrects the output voltage of the power supply in accordance with the acceleration or deceleration rate and the prevailing magnitude of the output frequency of the variable-voltage variable-frequency power supply.

REFERENCES:
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4009427 (1977-02-01), Takahashi

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