Control apparatus for variably controlling speed induction motor

Details Control apparatus for variably controlling speed induction motor Control apparatus for variably controlling speed induction motor

1999-03-18

2000-05-09

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318801, 318810, 318811, H02P 130, H02P 736, H02M 748

Patent

active

060608609

ABSTRACT:
A control apparatus for variably controlling a speed of an induction motor includes a voltage generator, adders, a rotating speed calculating device, a rotating direction detecting device, and a multiplier. The voltage generator is operated for a predetermined period of time at the start or restart of the induction motor to cause self-excited oscillation in a control system including the voltage generator, the induction motor and the PWM inverter. The rotating speed calculating device obtains the rotating speed data, and the rotating direction detecting device detects the rotating direction of the induction motor based on the .alpha.- and .beta.-axis components, on the stationary coordinate, of the primary current of the induction motor. And, the PWM inverter is started based on the obtained rotating speed data and rotating direction. The control apparatus facilitates starting the PWM inverter that supplies electric power to the induction motor or restarting the PWM inverter after the AC electric power supply to the PWM inverter has recovered from a momentary service interruption.

REFERENCES:
patent: 5731681 (1998-03-01), Inaniwa et al.
patent: 5811949 (1998-09-01), Garces

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