外文翻譯----4極自起動永磁同步電動機設(shè)計

1、附錄 附錄 B 外文文獻 外文文獻Design of a 4-pole Line Start Permanent Magnet Synchronous MotorF. Libert1, J. Soulard1 and J. Engström21 Royal Institute of TechnologyDepartment of Electrical Machines and Power Electronics,100 44

2、 Stockholm, Sweden e-mail: florence@ekc.kth.se e-mail: juliette@ekc.kth.se2 ITT Flygt ABBox 1309, 171 25 Solna, Swedene-mail: jorgen.engstrom@flygt.comAbstract — To improve the efficiency of submersible pumps, the soluti

3、on described in this article consists in replacing the rotor of the induction motor with a rotor presenting a squirrel cage and buried permanent magnets that can start on the grid. The analytical procedure to design t

4、he rotor is presented with magnets placed in U shape and a four-pole motor. The steady state and transient performances of the different designed motors are then studied using finite element calculations and analytica

5、l models. As an example, the design of a 75kW four-pole motor is described. 1. IntroductionIn order to decrease gas emissions, different countries led by the United States imposed classes of efficiency for stand-alone

6、induction motors through their legislation. Even though it is possible to increase the efficiency of traditional induction motors, this cannot be easily done without over sizing the motor, which is definitely contrary

7、 to the idea of an integrated motor for products such as pumps. In this case, the solution could be to find another type of motor that reaches higher efficiency levels: the Line Start Permanent Magnet Synchronous Moto

8、r (LSPM) is one of them. By introducing permanent magnets buried beneath the squirrel cage, a hybrid rotor is obtained which combines an asynchronous start with a synchronous steady state operation. With really low co

9、pper losses at steady state (harmonics losses only), a better efficiency can be reached. The design procedure, which will be described in this paper, has been used on a 75kW four-pole motor. Different designs were test

10、ed in order to find a good compromise between good steady state performances and a good start and synchronization. 2. Design procedure A: Start and synchronization of the LSPMs.The exterior magnets are placed directly

11、under one bar to heavily saturate the iron bridges and allow the magnetization of the air-gap. For a low harmonic content, an electrical pole angle near to 120° has been chosen. The magnets have all the same dime

12、nsions because of economical reasons. The magnet dimensions are calculated analytically in order to obtain the chosen no-load voltage [3].This analytical design procedure has been implemented in Matlab. As the whole pr