This paper presents the harmonic torque reduction by the different rotor pole angles of a three-phase 12/8 switched reluctance motor via an analytical model and simulation method. Improving torque performance by stator and rotor angles was applied for three-phase switched reluctance motor at stator pole/rotor pole ratios of 6/4, 8/12, 18/12, and 24/18. The average torque and the torque ripple effect by stator and rotor pole embrace have been recently studied in many projects. Due to the fact that leakage flux, flux density, and inductance are affected by the stator and rotor pole angles non-linear and linear leakage flux curves occur. Many stator and rotor pole angle combinations for the three-phase switched reluctance motor have already been done via a finite element method. In this paper, turn-on and turn-off angles will be figured based on stator and rotor pole embraces.

This paper presents two different approaches to improve the electromagnetic torque and output power of the hybrid Externally Excited Synchronous Motor (EESM) applied to Electric Vehicles (EVs). An analytical approach is first considered to define the main parameters of the proposed machine. Based on the obtained results from the analytical model, the hybrid EESM is designed with different rotor shapes and step-skewing magnet segments to reduce the total losses and improve torque ripple. Then, Finite Element Analysis (FEA) is applied to compute and simulate electromagnetic parameters, such as the magnetic flux density, mean torque, and output power. The development of these two approaches is validated on an actual EESM machine and the agreement with the theory is shown.

A Permanent magnet BLDC motor has been designed with different rotor configurations based on the arrangement of the permanent magnets such as step skewing Halbach continuous ring/sinusoidal array. Rotor magnet arrangement configuration strongly influences the torque and efficiency performance of permanent magnet electric motors. This paper is to compare and evaluate different rotor configurations for PM BLDC motors with parallel/radial and Halbach continuous ring/sinusoidal array permanent magnets. Many applications for electric drives or electric aircraft prefer surface-mounted permanent magnet design due to its ease of construction and maintenance. A finite element method has been used for the analysis and comparison of different geometry parameters and rotor magnet configurations to improve efficiency and torque performance. This paper describes a comprehensive design of a three-phase PMBLDC motor with 15 kW for an in-wheel electrical drive. An FEA simulation of the PMBLDC motor has been implemented to evaluate their designs. In this paper, the step-skewing and Halbach magnet array are applied to the PM surfacemounted Brushless DC Motor for eliminating torque ripples. To observe the skewing rotor effect, the rotor slayers are skewed with different angles and a Halbach sinusoidal/continuous ring array. With a determined skewing angle, the cogging torque is eliminated theoretically, and back EMF harmonics are also analyzed. After several design validation, a suitable design will be selected for pilot manufacture.

A permanent magnet assistance synchronous reluctance motor can start directly with a net voltage or a power converter via a torque control method. However, this motor has usually a higher irreversible demagnetization level in comparison with interior permanent magnet motors, due to the fewer permanent magnets in rotor slots. In order to cope with this disadvantage, different arrangements of permanent magnets in the rotor of the line-start permanent magnet assistance synchronous reluctance motor are proposed in this paper. The V magnet shape taking skewed slots and demagnetization effect into account with the short circuit current are investigated by the finite element approach. The efficiency, torque, and output power of the proposed model have been also improved. Finally, the rotor with 3V layered magnets is prototyped to verify the efficiency of the proposed motor.

Interior Permanent Magnet Synchronous Motors (IPMSM) are increasingly utilized across various fields as a result of their superior performance and high power density. To ensure efficient operation in electric vehicles and industrial applications, these motors have to meet the stringent performance objectives of low vibration. This study proposes an optimization method based on Genetic Algorithm (GA) techniques to minimize losses and material costs. First, an analytical model is developed to determine the required parameters for an IPM motor with five pole pairs, 15 slots, and a power rating of 7.5 kW. Subsequently, the GA is implemented using the analytical model to optimize the electromagnetic parameters of the IPM motor. Finally, the Finite Element Method (FEM) is applied to simulate the parameters obtained from the analytical model and GA. The results before and after optimization, including material cost functions, total losses, and motor outputs, were compared to validate the proposed method.