【正文】 ., Krishnan R.: Modeling, Simulation, and Analysis of PermanentMagnet Motor Drives, Part I: ThePermanentMagnet Synchronous Motor Drive, IEEE Transactions on Industry Applications, Vol. 25, ,pp. 265273.[23] 胡敏強(qiáng)、[M].南京：東南大學(xué)出版社，2003.[24]王秀和，張瑞橋，唐任遠(yuǎn)．永磁直流電動(dòng)機(jī)氣隙磁場(chǎng)的解析計(jì)算[J]．電工技術(shù)學(xué)報(bào)，1999，14(5)：14~17．[25] 劉瑞芳．基于電磁場(chǎng)數(shù)值計(jì)算的永磁電機(jī)性能分析方法的研究[D]：南京：東南大學(xué)電機(jī)與電器，2002．翻譯部分英文原文Motion Characteristics of a NovelSelfStart Type Permanent Magnet Synchronous MotorS. Arikawa*, T. Higuchi*, Y. Yokoi*, T. Abe*, Y. Miyamoto**, and M. Ohto*** Graduate School of Engineering, Nagasaki University, 114 Bunkyo, Nagasaki 8528521, Japan** Yaskawa Electric Corporation, 131 Nishimiyaichi 2 Chome, Yukuhashi, Fukuoka 8248511, JapanRecently, a permanent magnet type synchronous motor has been used widely for industry application. In the paper, we propose a novel selfstart type permanent magnet synchronous motor with squirrelcage. The motor is designed for high torque and high degree of efficiency. The motion characteristics are simulated. It is onfirmed that the motor operates satisfactory from start to synchronous speed. NTRODUCTIONIn this paper, we propose a selfstart type permanent magnet synchronous motor (PMSM). It operates on the basic principle of a squirrelcage induction motor bined with a permanent magnet synchronous motor [1]. An even numbered permanent magnets are stuck on the surface of the rotor core, that have same polarity. By the unique rotor structure, the motor is able to obtain high starting torque as the induction motor. The motor is not required to detect the rotor position and can be driven under openloop control. Additionally, in case of sudden pullout, the motor can rotate again as the inductiomotor. In this paper, we design permanent magnets of the rotor and simulate the motion characteristics from start to synchronous speed by using a finite element method (FEM) software.II. N OVEL SELF START TYPE PMSMA. Motor ConstructionFigure. 1 shows the rotor structure of the selfstart type PMSM proposed in this paper. It has a rotor bined the synchronous motor with the squirrelcage induction motor. It is 4poles machine but has two same polarity magnets. The magnets are stuck on the surface of the rotor core, and the wide remainder of the rotor core surface can be used for the squirrelcage part. The relative wide squirrelcage bars on both sides of the magnet prevent the leakage of magnetic flux of the permanent magnet. These structure enables effectively to use the revolving magnetic field produced by the armature current as well as the magnetic field by the permanent magnets. As the result, this motor has high starting torque as well as high synchronous torque. It also has high degree of efficiency at synchronous operation[2]. Motor structure.B. Torque CharacteristicsThe motor starts as the induction motor and accelerates to near synchronous speed. The torque at asynchronous speed is given by (1)P: Number of polesV 1 : Input voltagef: Frequency, s: Slipr 1 : Primary resistancer’ 2 : Secondary resistance seen from the primary sidex 1 : Primary leakage reactancex’ 2 : Secondary leakage reactance seen from the primary sideAt around the synchronous speed, the rotor is synchronized by the pullin torque and themotor operates as the synchronous motor. The synchronous torque is constitutes of magnet torque and reluctance torque. It is given by (2)P: Number of polesφ f : Armature flux linkage by PMI a : Amplitude of armature current : Phase angle of armature currentEven if the motor loses synchronization, the motor accelerates again as the induction motor to near synchronous speed and synchronized. [3].III. DESIGN AND BASIC CHARACTERISTICSA. Design ParameterThe design analysis is carried out. Figure. 2 shows 2DFEM model of the proposed selfstart type PMSM. Table 1 shows the resultant design parameters. The rated output power is , the rated voltage 200V, and the synchronous speed 1800rpm. Stator windings are distributed and fractional pitch windings。 the number of slots is 36 and the number of slots per pole per phases is 3. Number of rotor slots is 28. 2D analysis model. Design ParameterOutput powerNumber of poles4Voltage200VFrequency60HzRated speed1800rpmStator diameter157mmRotor diameterShaft diameter32mmMotor length90mmAir gapNumber of slots/pole/phase3Number of slots36Coil pitch8/9ConnectionY252。 Magnet parameters.B. Torque speed CharacteristicsThe effect of varying the permanent magnet dimensions on the torque characteristics is investigated. Input voltage is 200V. The design parameters are angle and height h m of the permanent magnet as shown in Figure 3. Figure 4 shows the simulated torquespeed characteristics. The black dotted line is the torquespeed characteristics of a same sized induction motor. It is shown that the selfstart type PMSM have the same asynchronous characteristics as the induction motor and it has not only high starting torque but also high synchronous synchronous torque increases with increasing and hm ,but the torque for start and acceleration decrease. The torque of the selfstart type PMSM has a dent point at slip of owing to the permanent magnet flux. 238。 Torquespeed characteristics.C. Efficiency CharacteristicsTable 2 shows the efficiency characteristics of the motor described above. The efficiency is calculated by （3） P: Output power P c : Copper loss P i : Iron lossThe efficiency is assumed under the direct axis current i d =0 control. The quadrature axis current i q is given so that the rated torque of Nm are obtained at synchronous speed. Increasing on the condition of constant hm or increasing hm on the condition of constant decrea