Asymmetrical Four-Phase Combined Winding Arrangement for Bearingless PM Motors
Asymmetrical Four-Phase Combined Winding Arrangement for Bearingless PM Motors
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无轴承永磁电机的不对称四相组合绕组布置
DOI：
10.1109/tia.2021.3089447
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发表时间：
2021
影响因子：
4.4
通讯作者：
Chiba Akira
中科院分区：
文献类型：
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作者：
Asama Junichi;Kamiya Yoshinori;Chiba Akira
传统的无轴承电机通常在定子中包含两组独立的绕组，以产生扭矩和悬浮力，在本研究中用分离的绕组表示。然而，已经研究了几种将悬架和旋转绕组组合成一组绕组（称为组合绕组）的方法，以提高扭矩密度并增加启动时的瞬时悬架力产生。本研究提出了一种基于磁动势（MMF）分布的方法，将典型的三相无刷直流电机转换为具有组合绕组的四相无轴承电机。以 12 槽/10 极表面安装永磁电机为例进行了研究。计算结果表明，当四相对称布置时，在一定的旋转角度下无法产生悬浮力。本研究引入基于MMF分布的扭矩和力电流因子来选择几种不对称四相绕组布置。对通过有限元方法计算的径向力轨迹进行评估以确定最终模型。为了验证所提出的方法，搭建了样机并进行了测试，测试结果表明转子成功悬浮并可驱动至5000 r/min。
Conventional bearingless motors typically comprise two sets of independent windings in the stator to produce torque and suspension force, denoted by a separated winding in this study. However, several approaches to combine suspension and rotation windings into one set of windings, known as combined winding, have been investigated for torque density improvement and for increasing the instantaneous suspension force production at start-up. This study proposes a method to convert a typical three-phase brushless dc motor into a four-phase bearingless motor with combined winding, based on the magnetomotive force (MMF) distribution. As an example, a 12-slot/10-pole surface-mounted permanent magnet motor was investigated. The calculation results demonstrate that the suspension force cannot be generated at certain rotational angles when the four phases are symmetrically located. This study introduces torque and force current factors based on the MMF distribution to select several asymmetrical four-phase winding arrangements. The radial force trajectory calculated by the finite element method was evaluated to determine the final model. To verify the proposed method, the prototype was built and tested, and the test results showed that the rotor was levitated successfully and could be driven up to 5000 r/min.