| In recent years, because of the vehicle exhaust emissions, the air pollution is becoming more and more serious. Therefore, developing electric vehicle business and building new transportation operation mode has become a discuss hot around the world.The electric vehicle is a kind of energy-saving traffic tools. PMSM is the most suitable for the high performance motor. It has a very broad space for development. However, The traditional PMSM is hard to meet the condition of speed-adjusting range with field weakening. From the view of increasing D-Axis reactive reactance and reducing No-load back emf, this paper strives to expand the speed-adjusting range with field weakening of the electric vehicle, based on the favourable output torque performance of PMSM.Based on the FEA software, the simulation of PMSM has been done. Modify the permanent magnet size and design the depth of permanent magnet embedded. In order to reduce the cogging torque, expand the speed-adjusting range with field weakening and optimize the motor performance.According to the problem of the electric vehicle with inner-buried permanent magnet synchronous motor difficult to weak magnetic in order to wider speed, this paper discusses the advantages of the sectional permanent magnet in constant-powerfield-weakening speed expanding. Analyzes how the size of the permanent magnet segment spacing influences the performance of motor. Obtains the conclusion of that increasing segment spacing within the scope of certain can improve constant-powerfield speed range.Based on the parameters of model machine, this paper also researches the advantages and disadvantages that V-shape PMSM compared with the traditional one. Analyze how the motor performance would be influenced by V-shape permanent magnet parameters such as the depth of permanent magnet embedded, the length of magnetization direction and the width of magnetic bridge. Experimental results indicated that the conclusion of theoretical analysis is correct. |
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