Abstract
With the wide application of pulse width modulation (PWM) technology in motor driving, the bearing current problem has become more and more severe. The most complicated problem in analyzing bearing currents is modeling the equivalent circuit of the bearing and determination of the equivalent parameters of the model. During the process of bearing current breakdown, the bearing undergoes a transition from the capacitor state to the resistor state. The previously used equivalent model, which only consists of a capacitor parallel with a constant resistor, cannot reveal the real breakdown process. In this paper, an improved equivalent bearing model is derived from the waveform analysis of the experiment. The variable breakdown resistance model of the bearing is put forward and the calculation method of the breakdown resistance is given. The circuit simulation results from the variable resistance bearing model were much closer to the results of the experiment than those from the constant resistance model.
Highlights
The motors play an important role in the process of energy conversion
Bearing current is one of the factors affecting the normal operation of the motors and generators [1,2,3]
First we describe building the bearing breakdown experiment
Summary
The motors play an important role in the process of energy conversion. Factors affecting the normal operation of the motors have received the attention of many motor manufacturers and motor users. Bearing current is one of the factors affecting the normal operation of the motors and generators [1,2,3]. The common mode voltage generated by the converter can induce electrical corrosion of the bearing, which brings danger to the motor system. With the coupling of the stray capacitances, the common mode voltage induces a high frequency bearing voltage V b between the inner raceway and the outer raceway of the motor bearing. When the motor determination of the equivalent electrical parameters of the bearing. An improved bearing breakdown equivalent circuit model is proposed. The method of determining the electrical parameter values of the bearing circuit model is proposed. The accuracy of the new model is verified by comparison of simulations
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