Fault diagnosis of a squirrel cage induction motor fed by an inverter using lissajous curve of an auxiliary winding voltage

Abstract

The development of electronic power components has allowed the increase of the induction machine performance. Indeed, monitoring squirrel cage induction motors driven through rectifiers and inverters has been a major concern. This paper presents a new method to diagnose the combination inverter-machine faults. This technic considers an auxiliary winding which is a small coil inserted between two stator phases. It is based on Lissajous curve of this auxiliary winding voltage Park components. For this purpose, modeling the electromechanical conversion chain is necessary. The focus will particularly be on modeling both the squirrel cage induction machine and the inverter in a non-defected case which is a reference. Moreover, the explicit expressions developed for the inserted winding voltage and its Park components will be presented. The simulation results show the effectiveness of the proposed method.

Diagnosis of rotor faults by fast Fourier transform using an auxiliary winding voltage

“…Figure 1 shows the coil position that forms an angle 𝜃 0 with the A stator phase and has no conductive contact with other phases but is mutually coupled with all the other circuits in both the stator and rotor sides. This approach was applied previously to a wound rotor induction motor [23]- [25]. The voltage of the auxiliary winding is the main key of this method.…”

Squirrel cage induction motor fault diagnosis using lissajous curve of an auxiliary winding voltage: case of broken bars

“…[ϕ s ] and [ ϕ r ] are the stator and rotor fluxes vectors respectively. The details of this matrixes are presented in [4], [16]- [18]. Furthermore, the overall mathematical model machine equations can be written as follows:…”

“…It is powerful in detecting broken bars and end rings and based on spectal analysis method using fast fourier transform [12]- [17] and discrete wavelet transform (DWT) [8], [9]. The auxiliary winding voltage is a new method used for diagnosising the squirrel cage induction machine [18], [19]. It needs the insert of a small coil "sneak" between two stator phases.…”

Diagnosis of induction motor failures using discrete wavelet transform of an auxiliary winding voltage

“…In fact, in a wide range of industrial application, induction motors are used with variable speed. For this reason, the present article establishes the detection of broken rotor bars and end rings of a squirrel cage induction motor fed by an inverter [17]. Due to the inaccessibility of direct measurements of rotor parameters in asynchronous motors, a new methodology for online fault detection is presented.…”