Torque controller for an AC motor drive and AC motor drive embodying the same
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United States of America Patent
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-
Jun 9, 1987
Grant Date -
N/A
app pub date -
Jun 18, 1985
filing date -
Jun 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an induction motor drive a signal representative of the torque T as derived by sensing only the stator armature current I, and the slip frequency f.sub.2 and by calculating instantaneously T=I.sub.1.sup.2 F, where F is a function of f.sub.2 /R.sub.2, where R.sub.2 is the rotor resistance of the motor. The value of R.sub.2 is adjusted to match temperature by generally two alternative methods: (1) measuring the stator temperature, relying on the change of resistance R.sub.1, known experimentally, and applying an equivalent change for the rotor resistance R.sub.2 ; (2) by running the motor at rated speed and determining experimentally R.sub.2 /f.sub.2 as a function of F.
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