Induction motor control unit

Details Induction motor control unit Induction motor control unit

1997-04-14

1998-10-13

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318799, 318801, H02P 763

Patent

active

058217274

ABSTRACT:
An induction motor controlling device realizes precise and discretional revolutional speed vector control without requiring a speed detector using an algorithm which is suitable for a system including a microcomputer.
A three-phase-to-two-phase converter detects a torque current inside a motor as a DC quantity based on instantaneous values of motor currents. A slip frequency is estimated using the torque current, and the slip estimation is used to obtain a motor's revolutional speed. An error in revolutional speed estimation is compensated by a compensation value which is obtained by amplifying an excitation current common phase voltage command.

REFERENCES:
patent: 4418308 (1983-11-01), Bose
patent: 4724373 (1988-02-01), Lipo
patent: 5559419 (1996-09-01), Jansen et al.

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