Improvement of asynchronous starting characteristic for a line start permanent magnet synchronous motor

研究成果发表在3篇论文、19次日本电机学会旋转机械技术会议等会议上的口头报告和1份出版物中。研究成果的概要如下：（1）异步起动永磁同步电动机（LSPMM）解析理论的建立：LSPMM的转子具有与感应电动机（IM）的鼠笼转子类似的永磁体和起动绕组。因此，LSPMM的分析理论非常复杂，因为必须考虑永磁体、起动绕组和转子铁结构的影响，所以通用的分析理论尚未建立。我们提出了一个新的一般分析理论LSPMM。(2)LSPMM的特性和常数检查：为了测定分析方法中使用的常数，进行了一些试验。结果表明，稳态同步运行特性试验表明LSPMM能够高效驱动，稳态异步运行试验表明起动电流由三个不同频率的分量组成。起动电流的频率验证了我们的分析理论的合理性。(3)LSPMM感应电动机特性的比较：采用10种不同间隙长度（0.25，0.30，0.35，0.40，0.45mm）的4极和8极感应电机，在基频到基频的3.5倍频率范围内运行，对其性能进行了详细的实验研究。结果表明，对于每个驱动频率，总损耗受初级电阻损耗和杂散负载损耗（SLL）以及间隙差距长度的显著影响。(4)采用T型等效电路直接法，在不考虑SLL的情况下，可以较好地计算出每个驱动频率下的IM特性。

We were able to announce research results in 3 papers, 19 oral reports to conferences such as the Rotating machine Technical Meeting of the Institute of Electrical Engineers in Japan, and 1 publication.A summary of the research results follows :(1) Establishment of analytical theory for the line-start permanent-magnet synchronous motor (LSPMM):The rotor of LSPMM has some permanent-magnet and starting winding like as a squirrel-cage rotor of an induction motor (IM). Therefore, the analytical theory of LSPMM is very complex, because the influence of permanent-magnet, starting winding and rotor iron construction must be considered, so the general analytical theory has not established yet. We proposed a new general analytical theory for LSPMM.(2) Examination of the characteristics and constants of LSPMM :For the purpose of the determination of the constant used in the analytical method, some tests were carried out. As a result, it was clarified that LSPMM is able to be driven at high efficiency by the steady-state synchronous operating characteristic test, the starting current consists of three components with different frequency by the steady-state asynchronous test. The frequencies of starting current verifies the justification of our analytical theory.(3) Comparison of the characteristics of induction motor with LSPMM :Using 10 types of 4-pole and 8-pole IMs with different gap length (0.25, 0.30, 0.35, 0.40, 0.45mm), and operated from based frequency to 3.5-times frequency of based frequency, the performance characteristics were investigated experimentally in detail. As a result, it is clarified that the total loss is remarkably affected by the primary resistance losses and the stray load loss (SLL) with the gap length for each driven frequency.(4) The IM characteristics can be calculated relatively well without the SLL for every drive frequency by employing the type T equivalent circuit direct method.