Apparatus for measuring circuit constant of induction motor with vector control system and method therefor
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United States of America Patent
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Jan 14, 1997
Grant Date -
N/A
app pub date -
Aug 8, 1994
filing date -
Sep 3, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for measuring at least one desired motor constant applicable to an equivalent circuit of the induction motor according to the present invention utilizes a vector controlled speed variable apparatus for the induction motor. After the input and output parameters of the induction motor are measured, the apparatus calculates and measures the desired motor constant using a corresponding equation. For example, the secondary circuit time constant is calculated using the following equation. That is to say, .tau..sub.2 .apprxeq..tau..sub.2q * and V.sub.1q *(t)=(V.sub.1q *).sub.+0.exp(-(1/.tau.2q*).t) wherein (V .sub.1q *).sub.+ denotes a control q-axis primary voltage component immediately after torqu and excitation current instructions have been changed to zero and output from a current control system (ACR), V.sub.1q *(t) denotes a time function of V.sub.1q * at each sampling period after the current instructions have been changed in the stepwise manner to zero.
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