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Sensorless Position Control of Induction Machines under Load Conditions
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| Author(s) |
N. Teske; G. M. ASher; K. J. Bradley; M. Sumner |
| Abstract |
An improved rotor position estimator for sensorless position control of induction machines is introduced. The new method ensures that the machine maintains accuracy and stability for high and changing loads without the use of an encoder. The rotor position estimation requires high frequency signal injection and uses a rotor saliency, such as rotor slot harmonics or a circumferential variation of the rotor resistance of leakage inductance. The rotor position estimation reduces the distorting effect due to saturation on the position harmonics which is inherent to machine operation at higher loads. A model is derived to analyze this saturation effect in the machine. A harmonic compensator is employed to remove the distorting saturation harmonics, thus improving the position estimation and achieving a stable position control, including zero speed and position holding under changing loads. A 30kW laboratory drive is operated under closed loop encoderless control using the estimated rotor angle as feedback for position control and field orientation. Experimental results using the new technique are presented to verify the effectiveness. |
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| Filename: | EPE1999 - PP00713 - Teske.pdf |
| Filesize: | 1.47 MB |
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| Type |
Members Only |
| Date |
Last modified 2004-04-07 by System |
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