Variable speed controlling device for induction motor

Details Variable speed controlling device for induction motor Variable speed controlling device for induction motor

1998-02-12

1999-09-28

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318804, 318809, 318811, H02P 0736, H02P 07635

Patent

active

059594292

ABSTRACT:
When an induction motor is variable-speed-controlled via an electric power converting circuit, the magnetic flux of the induction motor is modulated by adding an alternating current signal to, for example, a magnetizing current command. For example, the component depending on the slip frequency of the induction motor is extracted by an extracting means from at least one of the amounts of changes of the voltage, the electric current, and the magnetic flux, which are caused by the modulation of the magnetic flux. The amount of the voltage or the electric current supplied to the motor, etc. is controlled based on the extracted component via an adjusting unit and a control means, thereby implementing superior control of the induction motor.

REFERENCES:
patent: 4459534 (1984-07-01), Nagase et al.
patent: 4469997 (1984-09-01), Curtiss et al.
patent: 5334923 (1994-08-01), Lorenz et al.
patent: 5341081 (1994-08-01), Yamada
patent: 5365158 (1994-11-01), Tanaka et al.
patent: 5459386 (1995-10-01), Okachi et al.
patent: 5481173 (1996-01-01), Yamamoto
patent: 5668459 (1997-09-01), Kim

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