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A Sensorless Rotor Temperature Estimator for Induction Machines based on Current Harmonic Spectral Estimation Scheme
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| Author(s) |
Zhi Gao, Thomas G. Habetler, Ronald Harley, Roy Colby |
| Abstract |
This paper proposes a sensorless rotor
temperature estimator for small to medium size mains-fed
induction machines. With measurements obtained from
only current and voltage sensors, the proposed estimator
can capture the rotor temperature in an online fashion.
First the rotor speed is extracted from the current harmonic
spectrum based on the estimated rotor slot and eccentricity
harmonic frequencies. Then the inductances are estimated
from the induction machine equivalent circuit. The stator
winding resistance at ambient temperature is the only motor
parameter needed at this stage. Once the inductances are
obtained, they are fed into the rotor resistance estimation
algorithm to yield an estimate of the rotor resistance.
Finally the rotor temperature is calculated from the linear
relationship between temperature and rotor resistance.
Experimental results from different motors are shown to
validate the proposed scheme. The whole scheme is
accurate and reliable and is therefore suitable to be
implemented in a rotor thermal protection relay or a motor
drive employing vector control scheme to compensate for
the detuning effects. |
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| Filename: | T7-406.pdf |
| Filesize: | 347.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-08 by System |
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