A Novel Surface Inset Permanent Magnet Synchronous Motor for Electric Vehicles Aiming to successfully meet the requirements of a large output torque and a wide range of flux weakening speed expansion in permanent magnet synchronous motors (PMSM) for electric vehicles, a novel surface insert permanent magnet synchronous motor (SIPMSM) is developed. The method of notching auxiliary slots between the magnetic poles in the rotor and unequal thickness magnetic poles is proposed to improve the performance of the motor. By analyzing the magnetic circuit characteristics of the novel SIPMSM, the notching auxiliary slots between the adjacent magnetic poles can affect the qaxis inductance, and the shape of magnetic pole effects the daxis inductance of the motor. The combined action of the two factors not only weakens the cogging torque, but also improves the flux weakening capability of the motor. In this paper, the response surface methodology (RSM) is used to establish a mathematical model of the relationship between the structural parameters of the motor and the optimization objectives, and the optimal design of the motor is completed by solving the mathematical model. Experimental validation has been conducted to show the correctness and effectiveness of the proposed SIPMSM.

Flux Regulation for Torquecontrolled Robotics Actuators Upon the employment of robots in applications beyond traditional industries, the need for development of torquecontrolled actuators has become more evident. To exploit the full capacity of torquemotion actuators, it is essential to regulate the motor flux in demand. Despite many studies in this area, major research in flux control has been dedicated to speed control. This work targets to present a novel and robust field weakening strategy for surface mounted permanent magnet motors (SPMSMs) when only a torque reference is given so that the motor velocity can adapt to operating conditions. The concept of proposed approach is elaborated and described qualitatively and mathematically. This work analyses the robustness of proposed approach to variation in motor parameters, and compares it with the performance of another approach in simulation and experimental results.