Reduction of cogging torque and electromagnetic vibration based on different combination of pole arc coefficient for interior permanent magnet synchronous machine

Abstract

Cogging torque and electromagnetic vibration are two important factors for evaluating permanent magnet synchronous machine (PMSM) and are key issues that must be considered and resolved in the design and manufacture of high-performance PMSM for electric vehicles. A fast and accurate magnetic field calculation model for interior permanent magnet synchronous machine (IPMSM) is proposed in this article.Based on the traditional magnetic potential permeance method, the stator cogging effect and complex boundary conditions of the IPMSM can be fully considered in this model, so as to realize the rapid calculation of equivalent magnetomotive force (MMF), air gap permeance, and other key electromagnetic properties. In this article, a 6-pole 36-slot IPMSM is taken as an example to establish its equivalent solution model, thereby the cogging torque is accurately calculated. And the validity of this model is verified by a variety of different magnetic pole structures, pole slot combinations machines, and prototype experiments. In addition, the improvement measure of the machine with different combination of pole arc coefficient is also studied based on this model. Cogging torque and electromagnetic vibration can be effectively weakened. Combined with the finite element model and multi-physics coupling model, the electromagnetic characteristics and vibration performance of this machine are comprehensively compared and analyzed. The analysis results have well verified its effectiveness. It can be extended to other structures or types of PMSM and has very important practical value and research significance.

A Cogging Torque Minimization Procedure for Interior Permanent Magnet Synchronous Motors Based on a Progressive Modification of the Rotor Lamination Geometry

“…Some of these techniques involve the optimum design of stator elements, such as, for example, the skewing of the lamination stack [5,6], or the modification of the stator tooth width [7]. The cogging torque can also be minimized by acting on the pole arc width, as described in [8,9]. An interesting alternative to the latest technique is proposed in [10,11], where the cogging torque is reduced by determining not only an adequate width of the polar arc, but also an optimized shape.…”

Method of Cogging Torque Reduction for Built-in Permanent Magnet Synchronous Motor

“…According to Equation (1), the groove torque can be reduced by reducing the Nz / 2P sub-Fourier decomposition coefficient Brnz/2p. Groove torque and 6k (k= 1,2,3...) For the built-in permanent magnet motor, the polar arc coefficient can be expressed by the central Angle corresponding to the two arcs.a [6] 2…”

Application for Optimization of New Soft Magnetic Material Motor by Taguchi Method

“…Cogging torque is an inherent property of permanent magnet motor, and its size affects the stability of motor operation. Therefore, high-performance motor needs low cogging torque [20]. Previous studies have shown that the application of new soft magnetic materials in the motor can effectively improve the efficiency of the motor.…”