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임준혁(Jun-Hyuk Im),박준규(Jun-Kyu Park),이승태(Seung-Tae Lee),정채림(Chae-Lim Jeong),허진(Jin Hur) 대한전기학회 2018 전기학회논문지 Vol.67 No.4
This study proposes the mitigation method of shaft voltage by varying the parasitic capacitance. First, the shaft voltage explained. Second, the parasitic capacitances causing shaft voltage are analyzed respect to geometry of motor and windings. Then, the equivalent circuit is established to obtain the shaft voltage and output torque characteristic and develope appropriate motor structure. Finally, simulation and experiment are conducted to verify that modified motor suppress the shaft voltage. This novel model does not require additional hardware.
축 전압 저감 구조 모터의 축 전압 주파수 응답 특성 분석
임준혁(Jun-Hyuk Im),박준규(Jun-Kyu Park),허진(Jin Hur) 대한전기학회 2020 전기학회논문지 Vol.69 No.3
In PWM based inverter driven motor, shaft voltages usually cause bearing fault. Many methods to mitigate the shaft voltages have been proposed. Since the high frequency components are hazardous to bearing, it is necessary to analyze the frequency responses for each shaft voltage mitigation method. In this paper, frequency responses of three shaft voltage mitigation methods are analyzed and compared. First, equivalent circuit models regarding geometric shape of motor are presented. Second, modified models of each equivalent circuit containing shaft voltage reduction methods are proposed. Finally, the comparison of the frequency responses for each shaft voltage mitigation method is presented.
인버터 파라미터에 따른 IPMSM의 공통 모드 전압 및 축 전압 분석
이열경(Yeol-Kyeong Lee),임준혁(Jun-Hyuk Im),허진(Jin Hur) 대한전기학회 2022 전기학회논문지 Vol.71 No.1
Cmmon-mode voltage (CMV) occurs in the pulse width modulated (PWM) method inverter of fast switching. The CMV induces shaft voltage and bearing current because of electrical interaction with the parasitic capacitance of the motor. CMV and shaft voltage are considered major causes of bearing fault. Motor fault poses a risk of accidents. Therefore, analysis of the CMV and shaft voltage of the motor is required. This paper analyzes the effect of parameter changes in inverter on CMV and shaft voltage. The parameters include DC link voltage, switching frequency, and carrier wave phase shift. An Equivalent simulation model is constructed through MATLAB/SIMULINK. The parasitic capacitance of the motor is obtained according to its structure. Comparative analysis of CMV, shaft voltage is carried out through simulation. Changes in motor output due to carrier wave phase shift are included. Finally, validation through experiments is included.