Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1999-05-11
2000-06-13
Sircus, Brian
Electricity: motive power systems
Induction motor systems
Primary circuit control
318807, H02P 534
Patent
active
060753374
ABSTRACT:
A control apparatus for an induction motor includes a current detector for detecting the current of the induction motor; a first coordinate transformer for resolving the current into an exciting current component and a load current component; a slip value calculator for calculating a slip angular frequency of the induction motor based on the load current component; a correction value calculator for calculating a correction value for the slip angular frequency of the induction motor in response to the change of the exciting current component; a multiplier for correcting the slip angular frequency by using the correction value calculated in the correction value calculator; an adder for calculating a reference primary angular frequency based on the corrected slip angular frequency; a voltage vector calculator for calculating a reference voltage value based on the reference primary angular frequency; and a second coordinate transformer for feeding the calculated reference voltage value to the inverter. The control apparatus keeps the rotating speed of the induction motor at a predetermined value when the slip frequency change occurs due to temperature rise in the induction motor.
REFERENCES:
patent: 4808903 (1989-02-01), Matsui et al.
patent: 5003243 (1991-03-01), Tadakuma et al.
patent: 5032771 (1991-07-01), Kerkman et al.
patent: 5298847 (1994-03-01), Kerkman et al.
patent: 5329217 (1994-07-01), Kerkman et al.
patent: 5334923 (1994-08-01), Lorenz et al.
patent: 5502360 (1996-03-01), Kerkman et al.
patent: 5598081 (1997-01-01), Okamura et al.
patent: 5619114 (1997-04-01), Blasko
patent: 5796236 (1998-08-01), Royak
patent: 5814967 (1998-09-01), Garces et al.
patent: 5886498 (1999-03-01), Sul et al.
Ishii Shin'ichi
Tajima Hirokazu
Duda Rina I.
Fuji Electric & Co., Ltd.
Sircus Brian
LandOfFree
Speed control apparatus for induction motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Speed control apparatus for induction motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speed control apparatus for induction motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2071050