中文摘要：

为了更加全面深入地研究SEMIHEX接法的优越性，将该接法应用于异步起动三相永磁同步电动机的单相运行上。首先，给出了异步起动永磁同步电动机同步运行时以及起动瞬间的正序、负序阻抗表达式，并且基于对称分量法，对该接法电机的对称运行条件进行分析；然后，提出了单相运行时的稳态性能计算方法；最后，设计了一台异步起动永磁同步电动机作为试验样机，将其按照SEMIHEX接法进行改接，进行了稳态试验研究。结果表明，三相永磁同步电动机采用SEMIHEX接法单相运行时，具有与同容量三相永磁同步电动机相近的效率和更高的功率因数。因此，可以在实际应用中设计较低功率因数的异步起动永磁同步电动机，采用SEMIHEX接法单相运行时，在电路中接入电容器，来提高功率因数。

英文摘要：

Aiming at the SEMIHEX connection fully and deeply, the steady-state performances of the single-phase operation of a line-start permanent magnet synchronous motor adopting this connection were analyzed. First of all, the positive sequence impedance and negative sequence impedance of three-phase line-start permanent magnet synchronous motor were presented, and based on the symmetrical component method, the condition for balanced operation was analyzed and the method for determining the requested capacitances was also obtained. Then, the approach for calculating the steady-state performance was brought out. Finally, a line-start permanent magnet synchronous motor was designed as prototype, in ad- dition, it was reconnected to operate on a single-phase power supply, based on which, experimental research was carried out. It is concluded that, compared with balanced three-phase operation, the permanent magnet synchronous motor running from a single-phase power supply has nearly the same efficiency when operating at rated load but has a higher power factor. As a result, a three-phase permanent magnet synchronous motor with lower power factor is designed in practical applications, nevertheless the power factor is enhanced when reconnected to a single-phase operation by adopting SEMIHEX, owning to the capacitors connected to the circuit.