Apparatus to reduce no load current at low frequencies

Details Apparatus to reduce no load current at low frequencies Apparatus to reduce no load current at low frequencies

1997-08-13

1998-09-29

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, 318811, H02P 7628

Patent

active

058149678

ABSTRACT:
A system for accurately determining a torque current i.sub.qe for use in field oriented control of an induction motor at low rotor frequencies (e.g., about half of the motor rated frequency) which provides an ideal no load current and still enables high torque at low speed. The system includes a frequency/correction angle identifier which, based on an applied stator voltage frequency, provides a correction angle which is added to a perceived phase angle to generate a corrected phase angle which is used to calculate the torque current component i.sub.qe. The torque current component is then used by a slip calculator and an IR compensator to adjust motor operation.

REFERENCES:
patent: 4459534 (1984-07-01), Nagase et al.
patent: 4958117 (1990-09-01), Kerkman et al.
patent: 5329217 (1994-07-01), Kerkman et al.
patent: 5541488 (1996-07-01), Bansal et al.

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