Sensorless Monitoring of Induction Motor Drive Systems
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Abstract The paper deals with sensorless monitoring of induction motor drive systems. It is well known that induction motor drives are very important parts of any industrial application involving electrical equipment. They must be carefully surveyed to ensure reliable and profitable operations. However induction motor drive systems are also known as complex nonlinear time-varying systems. Thus entails great difficulties for monitoring purposes. Based on the fact that the system model can be significantly simplified if one applies the d-q Park transformation and an appropriate field orientation technique, an adequate model structure is obtained. An observer-based state variable estimation technique is used for sensorless monitoring of a general induction motor drive system. The sensorless monitoring procedure uses a simple curves plotting of the estimated state variables. The approach permits to detect up to five percent changes in the estimated state variables information. Copyright © 2004 IFAC
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