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

发表论文3篇，在日本电机工程师学会（Institute of Electrical Engineers in Japan）旋转机械技术会议（rotary machine Technical Meeting）发表口头报告19篇，发表论文1篇。研究结果总结如下：(1)建立了线路起动永磁同步电动机的解析理论：线路起动永磁同步电动机的转子与异步电动机的鼠笼转子类似，具有一定的永磁体和起动绕组。因此，LSPMM的解析理论非常复杂，因为必须考虑永磁体、启动绕组和转子铁结构的影响，所以一般的解析理论尚未建立。我们提出了一种新的LSPMM的一般分析理论。(2) LSPMM的特性和常数的检验：为了确定分析方法中使用的常数，进行了一些试验。通过稳态同步工作特性试验，阐明了LSPMM能够高效驱动，稳态异步起动电流由三个不同频率的分量组成。启动电流的频率验证了分析理论的正确性。(3)感应电机与LSPMM的特性比较：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imm，在基频至基频的3.5倍频率范围内工作，对其性能特性进行了详细的实验研究。结果表明，总损耗显著地受到初级电阻损耗和杂散负载损耗（SLL）随驱动频率间隙长度的影响。(4)采用T型等效电路直接法，可以较好地计算出各驱动频率的IM特性，而无需考虑SLL。

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.