Abstract
Common-Mode Voltage (CMV) induces shaft voltage and bearing current due to the electrical interaction with the parasitic capacitance of the motor. CMV, shaft voltage, and bearing current are considered the major causes of bearing fault. Motor fault in a traction system poses a risk of accidents. Therefore, it is necessary to reduce the CMV and the shaft voltage to ensure the reliability of the bearing. However, some existing CMV reduction methods are based on asynchronized space vector pulse width modulation (SVPWM), which will cause unacceptable harmonic distortion at a low switching frequency. Alternatively, some CMV reduction methods based on synchronized SVPWM burden the processor because they require a lot of calculation. In this paper, the method to reduce CMV and shaft voltage is proposed using carrier wave phase shift in SVPWM. CMV is explained in traditional SVPWM, and CMV is reduced by shifting the carrier wave phase of one phase. The simulation model is constructed through MATLAB/SIMULINK and Maxwell 2D/Twin Builder. Considering the proposed method, CMV, shaft voltage, and bearing current are analyzed by an equivalent circuit model. Moreover, the output torque behaviors with different input currents are analyzed through the simulation.
Highlights
The interior permanent magnet synchronous motor (IPMSM) with pulse width modulated (PWM) inverter has been used in a wide range of applications because of its high efficiency, better performance, and ability to control a wide area
A shaft voltage equivalent circuit model is constructed to confirm the change in the shaft voltage for the change in Common-Mode Voltage (CMV)
Since the modulation index of the input reference voltage in the IPMSM depends on the magnitude of the back EMF, it is performed at various speeds
Summary
The interior permanent magnet synchronous motor (IPMSM) with pulse width modulated (PWM) inverter has been used in a wide range of applications because of its high efficiency, better performance, and ability to control a wide area It is especially used in traction systems such as electric vehicles, urban air mobilities, and electric ships. Generalized-roughness defects are those that significantly degrade, rough, or deform the bearing surface Common causes of this type of fault include contamination, lack or loss of lubricant, and misalignment [9,10,11]. The CMV occurring at this time interacts with the component of the parasitic capacitance of the motor to induce shaft voltage and bearing current.
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