SVPWM逆变器供电时FSCW-PMSM损耗特性研究

为探究空间矢量脉宽调制(space vector pulse width modulation，SVPWM)逆变器引入的时间谐波电流对分数槽集中绕组永磁同步电机(fractional-slot concentrated-winding permanent magnet synchronous machine,FSCW-PMSM)损耗特性的影响，文中提出一种SVPWM逆变器与FSCW-PMSM联合系统中电机损耗谐波特性分析方法。首先，理论分析了考虑时间谐波电流时电机损耗的时空谐波特性。其次，以一台三相双层绕组10极12槽PMSM为例，搭建电机与SVPWM逆变器的场路联合仿真模型，求解样机在恒转矩和恒功率调速时损耗的谐波特性，揭示各谐波损耗的产生机理。结果表明：转子谐波损耗由基波电流与次谐波、iZ±p次齿谐波和(f_c±4f)/f、(f_c±2f)/f次时间谐波电流与p、Z±p次空间谐波引起；定子铁芯谐波损耗由基波磁场、谐波励磁磁场及(f_c±4f)/f、(f_c±2f)/f次时间谐波电流引起。该结论适用于其他极槽组合的FSCW-PMSM。最后，通过实验验证了该分析方法的有效性。

Loss characteristics investigation of FSCW-PMSM under SVPWM inverter supply

To investigate the effects of time-harmonic current introduced by inverter on loss characteristics of fractional-slot concentrated-winding permanent magnet synchronous machine (FSCW-PMSM),a method is proposed to analyze the harmonic characteristics of losses of the machine in inverter and FSCW-PMSM combined system. Firstly,the time- and space-harmonic characteristics of losses considering time-harmonic current are theoretically analyzed. Then,a 10-pole and 12-slot PMSM with three-phase double-layer winding is taken as an example. The field-circuit co-simulation model of the prototype and space vector pulse width modulation (SVPWM) inverter is established,the harmonic characteristics of losses are calculated under constant torque and constant power speed control,and the causes of each harmonic loss are revealed. The results show that rotor harmonic losses are caused by fundamental current with sub-harmonic,iZ±p slot harmonics,and (f_c±4f)/f,(f_c±2f)/f time-harmonic current with p,Z±p space harmonics. Stator core harmonic losses are caused by fundamental magnetic field,magnet harmonic excitation magnetic field and (f_c±4f)/f,(f_c±2f)/f time-harmonic current. The conclusions can be applied to the FSCW-PMSMs with other pole-slot combinations. Finally,the proposed method is validated by experiment results.