Analysis and Verification of a Cogging Torque Reduction Method for Variable Flux Memory Permanent Magnet Machine

Abstract

In this paper, an analytical method based on the series transform and skewed slot structure of rotor is adopted to reduce the cogging torque of the variable flux memory permanent magnet (VFMPM) machine. Firstly, the theory analysis of the cogging torque of the VFMPM machine was completed. Secondly, a simulation model of the VFMPM machine was established, aiming at calculating the cogging torque of the VFMPM machine and verifying the correctness of the above analytical method. Thirdly, a prototype of 14 rotor slots and 12 stator slots of the VFMPM machine was manufactured, and the experimental results of the cogging torque of the VFMPM machine further verified the effectiveness of the above mentioned theory analysis. Besides, the load force of the VFMPM machine including the cogging torque was also tested and analyzed in this paper.

Active Disturbance Rejection Controller for Smooth Speed Control of Electric Drives Using Adaptive Generalized Integrator Extended State Observer

“…To alleviate the effect of torque ripple, there are two types of methods that can be used [5]. The first group of technologies includes motor-design techniques like skewing [6], stator pole arc design [7], and PM magnetic design [8]. However, these procedures are expensive and only applicable to newly developed machines.…”

Reduction in the Cogging Torques in the DCEFSM Motor by Changing the Geometry of the Rotor Teeth

“…• appropriate choice of the angular span of the rotor poles (teeth) in reluctance machines [14,15]; • making slots in the stator or rotor that are skewed [3,4,11,[14][15][16][17]; • desymmetrization of the angular arrangement of rotor poles (teeth) in reluctance machines [4,10,11]; • choice of the shape of the face of the poles/teeth of the stator or rotor [18,19]; • making cuts in the stator teeth or inserting additional teeth [7,15,17]; • using an appropriate current power supply [12,20,21].…”