Lissajous Curve of an Auxiliary Winding Voltage Park Components for Diagnosing Induction Motor Inverter Defects

Abstract

In this paper, a new method for voltage inverter feeding induction motor fault diagnosis is presented. It is based on the so-called the Lissajous curve of an auxiliary winding voltage Park components. For this purpose, time domain mathematical model of a three phase induction motor fed by an inverter and expressions of the inserted winding voltage and its Park components are presented. Simulation results curried out for non defected and defected inverter show the effectiveness of the proposed method.

Lissajous Curve of an Auxiliary Winding Voltage Park Components for Diagnosing Multiple Open Switches Faults in Three Phase Inverter

“…L are its resistance and inductance matrices. The components of these matrices are presented in detail in [10]. We should add, to the electrical matrix differential equations system, the following general mechanical equations:…”

“…The method consists of inserting an auxiliary small winding which is a small coil "sneak" that forms an angle θ 0 with the A stator phase. This coil has no conductive contact with the other phases but it is mutually coupled with all the other circuits on both the stator and rotor sides [8][9][10][11].…”

“…From the above system, formed by Eq. 2 and Eq.4, that can be resolved using Runge-Kutta numerical method, we obtain the machine main currents i sa , i sb , i sc , i ra , i rb and i rc which lead to the auxiliary winding flux expression [8][9][10][11]:…”

“…Induction motor inserted auxiliary winding voltage acts as a good transducer for detecting defects. The Lissajous curve of its Park components can hence detect various faults without disturbing the motor operation [8][9][10]. It was presented in [10] to detect three phase voltage inverter feeding induction motor in the cases of single switch fault and in the case of the inverter capacitances defects.…”

“…The Lissajous curve of its Park components can hence detect various faults without disturbing the motor operation [8][9][10]. It was presented in [10] to detect three phase voltage inverter feeding induction motor in the cases of single switch fault and in the case of the inverter capacitances defects. The aim of this paper is to present this technique in the case of he inverter multiple open switches faults.…”