【作者】 孙明冲；

【导师】 郝双晖；

【作者基本信息】 哈尔滨工业大学 ， 机械设计及理论， 2009， 硕士

【摘要】 该课题来源于电动汽车的轮毂电机的研制。轮毂电机要求体积小、转速高、功率密度高。针对这些要求,本文以轮毂电机的电磁方案设计和优化为主线,同时对轮毂电机的弱磁控制进行研究。论文利用电磁场有限元法,对轮毂电机的电磁方案进行了合理的设计,满足了电动汽车驱动的要求,达到了轮毂电机的性能指标要求;通过对电动汽车牵引特性的计算,得出了轮毂电机的设计要求;利用有限元进行电磁分析,确定了轮毂电机的永磁体和隔磁桥尺寸;分析不同气隙长度的方案,确定了气隙长度;分析几种绕组方式特点,以及不同极对数对轮毂电机转子受力的影响,确定了极对数;通过分析不同槽型的齿部磁密和轭部磁密大小,确定了齿部和轭部尺寸;利用有限元进行加负载分析,提取扭矩和铁耗,计算出了电机效率。论文进一步优化了轮毂电机的气隙磁密波形和转矩波动。通过分析气隙磁密波形中产生谐波的原因,得出了削弱谐波的措施,并利用有限元软件进行分析,将分析结果在MATLAB中进行了傅立叶变换,分析比较后确定优化方案;论文通过对齿槽转矩的分析,得出了削弱齿槽转矩的措施,利用JMAG软件进行瞬态分析,分析出齿槽力矩曲线,通过分析比较得出了合理的电磁方案。为了实现轮毂电机的高转速,论文在矢量控制的基础上对弱磁控制策略进行了研究,并且对样机进行了弱磁控制下轮毂电机最高转速的测试;论文最后对电机的性能进行了试验验证。首先搭建了试验平台,对电机进行了参数调节,测试了轮毂电机的反电动势、转矩和NT曲线。更多还原

【Abstract】 This research subject came form the development of In-Wheel-Motor for Motorized-wheels truck. The main requests of the In-Wheel-Motor are small size, high speed and high power density. In response to these requests, main line of this paper is the design and optimization of electromagnetic program for the In-Wheel-Motor, at the same time, the flux-weakening control imposed on the In-Wheel-Motor was also studied.Through calculating traction characteristics of Motorized Wheels vehicles, the design requirements of the In-Wheel-Motor were obtained. Using finite element method, a reasonable design of the electromagnetic program of In-Wheel-Motor were gained, this program satisfied the driving demand of Motorized Wheels vehicles and reach the requirements of motor. Through the FEA of electromagnetic, the magnet and magnetic bridge size were determined. The program with different length of air gap were analyzed and compared, the optimal length of air gap was selected. Also several different winding program, the impact to force imposed on the rotor produced by different poles were analyzed too, the number of pole pairs is determined. Through analyzing tooth magnetic flux density and conjugate magnetic flux density under different slot type, this paper determined the size of tooth and conjugate. The finite element analysis was also used to extract the torque and iron losses, also obtained the Electric machinery efficiency.A further analysis is to study the air gap flux density harmonic of In-Wheel-Motor and its torque ripple. Through finding the reasons of the waveform generated by the air gap flux density harmonic, the paper gets measures to weaken the harmonic. Through using finite element analysis software to make FEA, the paper uses MATLAB to make Fourier Transform of the analysis results. Through analyzing cogging torque, the paper obtains measures to weaken the cogging torque. Through using JMAG software to make the transient analysis, the paper obtained cogging torque waveform. Through comparing, the paper finally determined reasonable electromagnetic program.In order to achieve the high-wheel motor speed, the paper makes study on flux-weakening control Strategy as well as maximum speed test of Prototype under flux-weakening control.Finally the paper makes experimental verification of the electric machinery function. At first we established a test platform, making parameters adjustment of the electric machinery, testing In-Wheel-Motor back electromotive force, torque and the NT curve.更多还原