【作者】 于爽；

【导师】 郑萍；

【作者基本信息】 哈尔滨工业大学 ， 电气工程， 2010， 硕士

【摘要】 在混合动力系统中径向-径向磁通复合结构永磁同步电机(CS-PMSM)与由行星齿轮和两电机组合而成的系统功能相同,可实现电控无级变速驱动的功能。本文对一台50kW/30kW的径向-径向磁通CS-PMSM进行了研究。首先选定了径向-径向磁通CS-PMSM的功率等级、极数和相应的极槽配合。在此基础上对构成径向-径向磁通CS-PMSM的两个电机进行重新设计,并分别建立二维有限元仿真模型对其性能进行仿真分析,证明设计结果的合理性。然后对径向-径向磁通CS-PMSM的齿槽转矩进行优化。在选择槽口宽度和极弧系数作为优化参数后,先对两电机分别进行优化,再分析两电机同向和反向转动时各自齿槽转矩的变化,最后对优化前后径向-径向磁通CS-PMSM的齿槽转矩和负载转矩波动进行了比较分析。由于径向-径向磁通CS-PMSM的两电机共用外转子,不仅在结构尺寸上互相制约,还存在磁耦合问题。从电机设计的角度实现了磁解耦,并在保证外转子铁心不饱和的情况下尽量减小其厚度提高电机功率密度。通过有限元计算对磁场干涉程度进行评估,并在两电机运行在不同负载情况时比较各自的输出转矩,最终证实两电机可以互不干涉地独立运行。最后建立径向-径向磁通CS-PMSM的二维有限元热模型,采用水冷和风冷两种冷却方式对电机的温度分布进行仿真,仿真结果表明电机可稳定运行于额定状态。更多还原

【Abstract】 Among hybrid system, the radial-radial flux composite-structure permanent-magnet synchronous motor (CS-PMSM) has the same function with the system composed of the plenetary gear and two electric machines, so it can realize the function of electronic continuously variable transmission. This thesis makes a study of a 50kW/30kW radial-radial flux CS-PMSM.Firstly the power rating of the radial-radial flux CS-PMSM is selected, so is its number of poles and its slot/pole number combinations. On this basis, the two motors which constitute the radial-radial flux CS-PMSM are redesigned. And then their two-dimensional finite element simulation models are established separately, so the simulation results of their performance can show the rationality of the design.Then the cogging torque of the radial-radial flux CS-PMSM is optimized. After the choice of slot width and pole arc coefficient as optimization parameters, firstly the two motors are optimized separately, and then the changes of their respective cogging torque are analyzed while the two motors turns in the same direction and reverse. The cogging torque and load torque fluctuations of the radial-radial flux CS-PMSM before and after optimized are compared and analyzed.As the two motors of the radial-radial flux CS-PMSM have common external rotor, not only check each other in structure, but also bring the matter of magnetic coupling. The magnetic decoupling is achieved by the design of two motors. And the thickness of the outer rotor core is reduced at full steam while ensuring the outer rotor core is not saturated, so it can increase the power density of the radial-radial flux CS-PMSM. Finally the extent of the magnetic field interference is assessed by finite element method, and the load torque of the two motors is compared when they run at different load conditions. Finally approves that the two motors of the radial-radial flux CS-PMSM can run independently without interference.Last the two-dimensional finite element thermal model of the radial-radial flux CS-PMSM is established, and simulate the temperature distribution of the radial-radial flux CS-PMSM using water-cooled and air-cooled, and the simulation results show that it can run at rated condition stably.更多还原