针对采用线性霍尔元件检测高速永磁同步电机转子位置时,存在多种非理想因素造成的误差进行分析,并提出了相应的误差补偿方法.当两路霍尔信号幅值不相等、相位非正交时,检测的转子位置信号中存在二倍基频的误差分量,对此提出一种基于坐标变换的位置误差补偿方法,即构造坐标变换以提取出霍尔信号中的正序分量,根据其正序分量解算出转子位置;当霍尔信号采样调理电路中存在低通滤波器以及安装角度存在偏差时,两路霍尔信号存在一定的相位偏差,提出了一种基于电流环特征量的位置误差自适应补偿方法,即根据电流环的特征量与转子位置误差之间的关系,对位置补偿角进行自适应调整以补偿误差.最后,通过仿真和实验验证了所提出的两种方法的有效性.

转子位置信息的精度影响高速永磁同步电机的运行性能,在高速运行条件下,转子位置估算容易受到环路滤波器和电机参数偏差等非理想因素的影响.首先,针对转子位置估算误差,该文提出一种自适应基准锁相环,主要思想是锁相环通过误差重构,实现对基频相关误差补偿.在此基础上,以最小电流为目标自适应调节锁相环的锁相基准,实现对非基频相关误差的补偿,最终实现对位置误差的全补偿,该方法实现简单、参数依赖性低、鲁棒性强.最后,基于一台高速永磁同步电机进行仿真与实验,结果验证了所提出方法的有效性.

基于超高速微型永磁电机(UHSMPMM)受多物理场特性制约的问题,该文对超高速微型永磁电机支撑系统、电磁(热)设计、结构强度及动力学等方面进行综合设计研究.首先,结合超高速微型永磁电机的工作特性及微型转子结构特点设计整体式支撑系统及电机整机架构;其次,研究高频条件下的电磁-损耗-温升特性,其中重点分析温升特性对转子结构强度的影响,并给出基于温度场耦合下的超高速转子结构强度关键参数的优化方法;再次,探究整体支撑系统中转子临界转速的影响因素及变化规律;最后,依据多耦合特性分析及优化结果,研制一台550000(r/min)/110W原理样机,并对样机进行实验测试.结果显示,该样机实现了稳定运行,从而证明了所提设计方法的有效性.

The output current ripple of the three-level (3-L) inverter is important to the performance of the 3-L permanent magnetic synchronous motor (PMSM) drive system, but the neutral point (NP) balance for the 3-L T-type inverter is not considered in the analysis of current ripple up to this point. The NP balance algorithms change the current ripple distribution and it is necessary to develop novel methods for current ripple analysis. In this study, the sinusoidal pulse width modulation with zero-order voltage injection and virtual space vector PWM (VSV-PWM) are utilised to balance the NP potential of the 3-L inverter in the PMSM drive system. The analytical methods of current ripple under these two modulation methods are proposed and the effects of these two NP balance methods on the output current ripple are investigated, respectively. Based on the analysis of current ripple, two variable switching frequency PWM (VSF-PWM) methods considering the NP balance are proposed. The proposed VSF-PWM methods can not only reduce the switching loss but also suppress the electro-magnetic interference noise while keeping the NP potential balanced. Especially, the proposed variable switching frequency VSV-PWM (VSF-VSV-PWM) can effectively alleviate the intrinsic problem of high switching loss of VSV-PWM.