Fault-Tolerant Control of Five-Phase Induction Motor Under Single-Phase Open

Wubin Kong,Jin Huang,Min Kang,Bingnan Li,Lihang Zhao 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.3

This paper deals with fault-tolerant control of five-phase induction motor (IM) drives under single-phase open. By exploiting a decoupled model for five-phase IM under fault, the indirect field-oriented control ensures that electromagnetic torque oscillations are reduced by particular magnitude ratio currents. The control techniques are developed by the third harmonic current injection, in order to improve electromagnetic torque density. Furthermore, Proportional Resonant (PR) regulator is adopted to realize excellent current tracking performance in the phase frame, compared with Proportional Integral (PI) and hysteresis regulators. The analysis and experimental results confirm the validity of fault-tolerant control under single-phase open.

Fault-Tolerant Control of Five-Phase Induction Motor Under Single-Phase Open

Kong, Wubin,Huang, Jin,Kang, Min,Li, Bingnan,Zhao, Lihang The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.3

This paper deals with fault-tolerant control of five-phase induction motor (IM) drives under single-phase open. By exploiting a decoupled model for five-phase IM under fault, the indirect field-oriented control ensures that electromagnetic torque oscillations are reduced by particular magnitude ratio currents. The control techniques are developed by the third harmonic current injection, in order to improve electromagnetic torque density. Furthermore, Proportional Resonant (PR) regulator is adopted to realize excellent current tracking performance in the phase frame, compared with Proportional Integral (PI) and hysteresis regulators. The analysis and experimental results confirm the validity of fault-tolerant control under single-phase open.

The Investigation of Multiphase Motor Fault Control Strategies for Electric Vehicle Application

Wubin Kong,Guangdi Tang,Tong Zhang 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1

Multiphase motors have the advantages of high power at low voltage, small torque ripple, high efciency, and anti-interference operation at fault condition. The machines are especially suitable for the electric vehicle (EV) applications. In this paper, the fve-phase induction motor is selected as an example. The fault-tolerant control strategies for diferent optimization objectives are proposed. For single-phase fault and two-phase fault, according to diferent constraints, the current amplitude equality method, the minimum stator copper loss method, the minimum torque ripple method is compared and analyzed. Considering that the fundamental and harmonic magnetic feld are no longer decoupled after the fault, the problem of magnetic feld coupling after the phase missing of the multiphase motor is analyzed in detail. Then, a method to suppress the coupling of spatial magnetic feld is proposed, and the torque ripple is reduced from 23.53 to 3.55%. Finally, the efectiveness of the fault-tolerant control strategies are verifed through the experimental comparison.

Optimized Non-sinusoidal Power Supply in High-Power Multiphase Induction Motor Drive Based on Harmonic Parameter Analysis

Wubin Kong,Haifeng Guo,Guangdi Tang,Zhixian Zhong 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6

A non-sinusoidal power supply is usually applied in a multiphase induction motor drive in order to improve the torque density with harmonic current injection. The harmonic parameters in the motor are essential for harmonic current proportion derivation. In the present work, detailed inductance parameters are derived, and an optimized non-sinusoidal power supply is proposed based on harmonic parameter analysis. The traditional method considers only air-gap fl ux density distribution optimization, while the yoke fl ux density is ignored. The proposed method focuses on optimizing the air-gap fl ux density and yoke fl ux density simultaneously. The proposed method improves the stator iron utilization, and the torque density and effi ciency are enhanced under heavy loads. Finally, 15 kW and 630 kW nine-phase motor drives are constructed, and the proposed non-sinusoidal power supply control strategy is validated experimentally.

Optimized non-sinusoidal SVPWM method for high power multiphase induction motor drives

Tang, Guangdi,Kong, Wubin,Zhang, Tong The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4

A space vector pulse width modulation with a non-sinusoidal power supply (NSVPWM) is proposed to improve the stator iron utilization in a multiphase motor. When compared with three phase motors, there are more control freedoms in multiphase motors. The space vector distribution under a non-sinusoidal power supply is analyzed to achieve an optimized selection. Then the harmonic injection proportional coefficient is derived aiming at flux density optimization, which includes the air-gap and the yoke flux distribution. 15 kW and 630 kW nine-phase concentrated winding induction motors are used as practical examples. By maintaining the amplitudes of the air-gap flux density and the yoke flux density as well as the stator copper loss, the electromagnetic torque densities are compared under various load conditions. Experimental results show that when compared with the traditional sinusoidal method, the output torque is improved by 5.45% with the proposed NSVPWM method.

Analysis of Half-coiled Short-pitch Windings with Different Phase Belt for Multiphase Bearingless Motor

Li, Bingnan,Huang, Jin,Kong, Wubin,Zhao, Lihang The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

The analysis and comparation of the half-coiled short-pitch windings with different phase belt are presented in the paper. The half-coiled short-pitch windings can supply the odd and even harmonics simultaneously, which can be applied in multiphase bearingless motor (MBLM). The space harmonic distribution of the half-coiled short-pitch windings with two kinds of phase belt is studied wi th respect to different coil pitch, and the suitable coil pitch can be selected from the analysis results to reduce the additional radial force and torque pulse. The two kinds of half-coiled short-pitch windings are applied to the five- and six-phase bearingless motor, and the comparation from the Finite Element Method (FEM) results shows that the winding with $2{\pi}/m$ phase belt is fit for the five phase bearingless motor and the winding with ${\pi}/m$ phase belt is suitable for the six phase bearingless motor. Finally, a five phase surface-mounted permanent magnet (PM) bearingless motor is built and the experimental results are presented to verify the validity and feasibility of the analysis. The results presented in this paper will give useful guidelines for design optimization of the MBLM.

Analysis of Half-coiled Short-pitch Windings with Different Phase Belt for Multiphase Bearingless Motor

Bingnan Li,Jin Huang,Wubin Kong,Lihang Zhao 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1

The analysis and comparation of the half-coiled short-pitch windings with different phase belt are presented in the paper. The half-coiled short-pitch windings can supply the odd and even harmonics simultaneously, which can be applied in multiphase bearingless motor (MBLM). The space harmonic distribution of the half-coiled short-pitch windings with two kinds of phase belt is studied with respect to different coil pitch, and the suitable coil pitch can be selected from the analysis results to reduce the additional radial force and torque pulse. The two kinds of half-coiled short-pitch windings are applied to the five- and six-phase bearingless motor, and the comparation from the Finite Element Method (FEM) results shows that the winding with 2π/m phase belt is fit for the five phase bearingless motor and the winding with π/m phase belt is suitable for the six phase bearingless motor. Finally, a five phase surface-mounted permanent magnet (PM) bearingless motor is built and the experimental results are presented to verify the validity and feasibility of the analysis. The results presented in this paper will give useful guidelines for design optimization of the MBLM.

Optimum Air-Gap Flux Distribution with Third Harmonic Rotor Flux Orientation Adjustment for Five-Phase Induction Motor

Kang, Min,Yu, Wenjuan,Wang, Zhengyu,Kong, Wubin,Xiao, Ye The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.1

This paper investigates optimum air-gap flux distribution with third harmonic rotor flux orientation adjustment for five-phase induction motor. The technique of objective is to generate a nearly rectangular air-gap flux, and it improves iron utilization under variation loading conditions. The proportional relations between third harmonic and fundamental plane currents is usually adopted in the conventional method. However, misalignment between fundamental and third harmonic component occurs with variation loading. The iron of stator teeth is saturated due to this misalignment. This problem is solved by third harmonic rotor flux orientation adjustment simultaneously, and direction and amplitude are changed with mechanical load variation. The proposed method ensures that the air-gap flux density is near rectangular for a maximum value from no load to rated load. It is confirmed that the proposed method guarantees complete both planes decoupling with third harmonic flux orientation adjustment. The effectiveness of the proposed technique is validated experimentally.

Optimum Air-Gap Flux Distribution with Third Harmonic Rotor Flux Orientation Adjustment for Five-Phase Induction Motor

Min Kang,Wenjuan Yu,Zhengyu Wang,Wubin Kong,Ye Xiao 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1

This paper investigates optimum air-gap flux distribution with third harmonic rotor flux orientation adjustment for five-phase induction motor. The technique of objective is to generate a nearly rectangular air-gap flux, and it improves iron utilization under variation loading conditions. The proportional relations between third harmonic and fundamental plane currents is usually adopted in the conventional method. However, misalignment between fundamental and third harmonic component occurs with variation loading. The iron of stator teeth is saturated due to this misalignment. This problem is solved by third harmonic rotor flux orientation adjustment simultaneously, and direction and amplitude are changed with mechanical load variation. The proposed method ensures that the airgap flux density is near rectangular for a maximum value from no load to rated load. It is confirmed that the proposed method guarantees complete both planes decoupling with third harmonic flux orientation adjustment. The effectiveness of the proposed technique is validated experimentally.