Motor controller and out of control detecting method
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United States of America Patent
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Issued Date -
Jun 29, 2006
app pub date -
Feb 6, 2004
filing date -
Feb 12, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A problem to be solved by the present invention is to provide a motor controller capable of enhancing the safety of a crane, or the like, by accurately detecting a control deviant state within a short period of time by means of simple computation using the amount of control of a motor. According to the present invention, a voltage and a current of an AC motor are controlled by subjecting the voltage and current to coordinate transformation along two axes 'd' and 'q,' and detects occurrence of a control deviant state from 'd' and 'q' components of the voltage or current. A control deviant state is determined to have arisen when a value--which is computed on the basis of .theta..sub.i=tan.sup.-1(Iq/Id) through use of an excitation current feedback value Id which is the 'd' component of the electric current and the torque current feedback value Iq which is the q component--has attained a predetermined value or more.
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