基于空间多分量极对数磁场耦合的FSCW双馈感应电机电磁及损耗特性分析

Analysis of Electromagnetic and Loss Characteristics of FSCW Doubly-Fed Induction Motor Based on Spatial Multi-Component Polar-Pair Magnetic Field Coupling

分数槽集中绕组(FSCW)感应电机中存在大量非主导极对数谐波,导致其转矩脉动及铁心损耗较大。针对此问题,以一台定子15槽、转子18槽的FSCW双馈感应电机为研究对象,对该类电机的转矩特性和铁心损耗特性进行了研究。首先,介绍了FSCW双馈感应电机的结构及工作原理,推导了其在双馈工况下的定子电流方程;其次,通过绕组函数法及匝数函数法求解了特定极槽配合下定转子前n次谐波自感和互感之和;然后,基于虚位移法对电磁转矩进行理论计算,并将理论计算结果与有限元仿真结果以及试验测量结果进行对比分析;最后,对不同工况下的转矩特性及铁心损耗特性进行了分析,得到了不同转差率下的电磁转矩脉动频率和铁心损耗的变化规律,即转矩脉动频率随转差率减小而增大,铁心损耗随转差率的减小而降低。

A large number of non-dominant pole-pair harmonics are present in fractional slot concentrated winding(FSCW)induction motors,resulting in high torque ripple and core losses.To address this problem,a FSCW doubly-fed induction motor with a 15-slot stator and 18-slot rotor was used to study the torque characteristics and core loss characteristics of this type of motor.Firstly,the structure and working principle of FSCW doubly-fed induction motor were introduced,and the stator current equation under doubly-fed operation was derived.Secondly,the sum of self-inductance and mutual inductance of the first n harmonics of the stator and rotor under a specific pole-slot fit was calculated using the winding function method and turns function method.Then,the electromagnetic torque was theoretically calculated based on the virtual displacement method,and the results were compared and analyzed with the finite element simulation results as well as the experimental measurement results.Finally,the torque characteristics and core loss characteristics under different operating conditions were analyzed,revealing the variation patterns of electromagnetic torque ripple frequency and core losses at different slip rates.Specifically,the torque ripple frequency increased as the slip rate decreased,while core losses decreased with the reduction in slip rate.