Study of the Effect of Load Torque on the Iron Losses of Permanent Magnet Motors by using Finite Element Analysis
Study of the Effect of Load Torque on the Iron Losses of Permanent Magnet Motors by using Finite Element Analysis
复制标题
负载扭矩对永磁电机铁损影响的有限元分析研究
DOI：
10.1541/ieejjia.8.522
复制
发表时间：
2019
影响因子：
1.7
通讯作者：
K. Fujisaki
中科院分区：
文献类型：
--
作者：
N. M. Thao;N. Denis;Yenyi Wu;S. Odawara;K. Fujisaki
采用脉宽调制（PWM）DC-AC逆变器可以将三相内置式永磁同步电动机（IPMSM）的输出转矩控制在允许范围内。在本文中，负载转矩对铁耗的IPMSM考虑三种不同的驱动条件下，即无电流，空载和负载条件下的影响进行了研究。为了在实验中进行仔细的评估，电机在各种转速下进行测试，即750 min-1，1500 min-1和2250 min-1; PWM逆变器的电压调制指数和负载扭矩也不同。实验结果表明，在无电流、空载和负载情况下，当励磁条件不同时，电机的铁损也不同。此外，当电机以750 min-1的额定速度运行时，对主测试用例进行三维（3D）有限元分析（FEA），以供参考。由励磁逆变器引起的定子电压、电流和磁通密度中的谐波分量被发现是电动机在空载和负载条件下的铁损相对于无电流条件增加的主要原因;转矩的增加也会导致铁损相对显著地增加。
The output torque of a three-phase interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) DC-AC inverter. In this paper, the effect of load torque on the iron losses of an IPMSM is studied by considering three different driving conditions, namely no-current, noload, and load conditions. In order to perform a careful evaluation in the experiments, the motor is tested at various rotational speeds, namely 750 min−1, 1500 min−1, and 2250 min−1; the voltage modulation index of the PWM inverter and the load torque are also varied. The experimental results in all the test cases show that the iron losses of the motor vary when the excitation condition is varied among the no-current, no-load, and load cases. Furthermore, a three-dimensional (3D) finite element analysis (FEA) is performed for the main test case when the motor is operated at the rated speed of 750 min−1 for reference purpose. The harmonic components caused by the excitation inverter in the stator voltage, current, and magnetic flux density are found to be the main reasons for the increase in iron losses of the motor in the no-load and load conditions compared to the no-current condition; an increase in torque also causes a relatively significant increase in the iron losses.