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Back-EMF Analysis of a Variable Flux Machine for Different Magnetization States

机译：不同磁化状态可变磁通机的回电EMF分析

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摘要

This article presents the effect of different magnetization pulse widths and methods on the back electromotive force (EMF), no-load losses, and minimum inverter rating at different operating conditions of a variable flux permanent magnet synchronous machine (VF-PMSM/VFM). Precise information of the back-EMF helps to estimate the cogging torque and torque ripple. An accurate determination of the core loss leads to a better efficiency estimation and machine design. An experimentally determined minimum inverter rating reduces the cost of the motor drive system. An adaptive nonlinear filter is used to estimate the VFM back-EMF during the motoring mode. The VFM is often demagnetized and remagnetized by injecting a current pulse to achieve the high-speed and high-torque requirements. The sudden injection of a d-axis current pulse will change the magnet flux linkage and back-EMF harmonics. In this article, harmonics present in the machine back-EMF due to different magnetization and demagnetization current pulse widths and magnetization methods are analyzed. Besides, the quality of the back-EMF for different speeds and machine no-load losses are presented for different magnetization levels. The minimum inverter current rating is determined for magnetizing current and magnetizing current at full load considering the minimum pulse amplitude and width to magnetize the VF-PMSM.
机译：本文介绍了不同磁化脉冲宽度和方法对反电动势（EMF），空载损耗以及可变通量永磁同步机（VF-PMSM / VFM）的不同操作条件下的最小逆变器额定值的影响。反EMF的精确信息有助于估计齿槽扭矩和扭矩波动。精确确定核心损耗导致更好的效率估算和机器设计。实验确定的最小逆变器额定值降低了电动机驱动系统的成本。自适应非线性滤波器用于在电动模式期间估计VFM反电动势。 VFM通常通过注入电流脉冲来达到高速和高扭矩要求来消磁和复制。 D轴电流脉冲的突然喷射将改变磁通量连杆和反态谐波。在本文中，分析了由于不同的磁化和退磁电流脉冲宽度和磁化方法而在机器反电动势中存在的谐波。此外，针对不同的磁化水平提出了不同速度和机器无负载损耗的后EMF的质量。考虑到最小脉冲幅度和宽度以磁化VF-PMSM的最小脉冲幅度和宽度，确定最小逆变器电流额定电流额定值。

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