Method and apparatus for controlling an AC motor and detecting m

Electricity: motive power systems – Induction motor systems – Primary circuit control

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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:
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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

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