Method and apparatus for controlling an AC motor and detecting m

Details Method and apparatus for controlling an AC motor and detecting m Method and apparatus for controlling an AC motor and detecting m

1994-09-16

1997-04-22

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318812, H02P 500

Patent

active

056231903

ABSTRACT:
Disclosed are methods and apparatus for quickly measuring a primary resistance value of an AC motor without using high precision detectors and detecting malfunctions such as breaking of wire in the AC motor or in a power converting mechanism, open phase, and three-phase unbalance. A voltage drop attributable to the primary resistance of the AC motor can be estimated by using an estimated resistance value R.sub.1.sup.#, which is estimated in turn by an integral or proportional-plus-integral operation on the deviation between a detected magnetizing current value I.sub.M and a reference magnetizing current value I.sub.M *, in place of an actual primary resistance value R.sub.1. The time for the estimated resistance value R.sub.1.sup.# to reach the true primary resistance value is reduced with a varying reference magnetizing current value I.sub.M **. Variations of the estimated primary resistance values R.sub.1.sup.# s between the phases are corrected with a mean estimated primary resistance value R.sub.1M.sup.# according to a reference phase value .phi.*. Malfunctions such as open phase and breaking of wire are detected by comparing estimated primary resistance values obtained according to the reference phase value .phi.*.

REFERENCES:
patent: 4442393 (1984-04-01), Abbondanti
patent: 4680526 (1987-07-01), Okuyama et al.
patent: 4764712 (1988-08-01), Blachke et al.
patent: 4914386 (1990-04-01), Zocholl
patent: 5160878 (1992-11-01), Nagano
patent: 5278485 (1994-01-01), Kim
patent: 5341081 (1994-08-01), Yamada

Affiliated with

Also associated with

Rating

Method and apparatus for controlling an AC motor and detecting m does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for controlling an AC motor and detecting m, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling an AC motor and detecting m will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-343689