Voltage Characteristics of a Consequent-Pole Bearingless PM Motor With Concentrated Windings
Voltage Characteristics of a Consequent-Pole Bearingless PM Motor With Concentrated Windings
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DOI：
10.1109/tmag.2009.2018679
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发表时间：
2009-05
影响因子：
2.1
通讯作者：
J. Asama;M. Amada;M. Takemoto;A. Chiba;T. Fukao;A. Rahman
中科院分区：
文献类型：
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作者：
J. Asama;M. Amada;M. Takemoto;A. Chiba;T. Fukao;A. Rahman
无轴承永磁电机将非接触磁悬浮和转矩产生功能结合在一起，可以实现无机械接触驱动。与表面安装式永磁电机等传统无轴承永磁电机不同，顺极式无轴承永磁电机具有固有的优势。它可以独立于电机驱动器调节径向转子位置，并且在径向悬浮力和转矩之间没有折衷。在无轴承永磁同步电动机中，电机绕组结构可以采用分布绕组或集中绕组。然而，电压特性和绕组设计之间的关系尚未被揭示。本文根据转子气隙中的磁通分布，对无轴承永磁电动机的感应电动势进行了数值计算。结果表明，二次谐波在一定的槽数下会使感应电动势发生畸变。仿真结果与实验结果吻合较好。
A bearingless permanent magnet (PM) motor combines functions of non-contact magnetic suspension and torque generation together, thus it can drive without mechanical contact. Unlike conventional bearingless PM motors, such as a surface-mounted PM motor, a consequent-pole type of bearingless PM motor has inherent advantages. It can regulate the radial rotor positions independently of the motor drive and has no tradeoff between radial suspension force and torque. In the consequent-pole bearingless PM motors, distributed or concentrated windings can be employed to the motor winding structure. However, relationship between voltage characteristics and the winding design has not yet been revealed. In this paper, the induced electromotive force (EMF) of the consequent-pole bearingless PM motor is numerically calculated on the basis of the magnetic flux distribution in the airgap around the rotor. It is found that the EMF is distorted by the second harmonic at a specific slot number in a consequent-pole rotor. The calculated EMFs are confirmed with the experimental results in the fabricated test machines.