Rigorous design and optimization of brushless PM motor using response surface methodology with quantum-behaved PSO operator

In this paper, a rigorous design of a brushless permanent-magnet (PM) motor with both lower cogging torque and higher efficiency, using response surface methodology (RSM) with a quantum-behaved PSO (QPSO) operator for a portable electric power drill application, has been presented. To decrease noise and vibration of a slotted PM motor, cogging torque must be reduced. Some skew techniques have obvious advantages of reducing cogging torque. In particular, the stepped equivalent model with its cost-effectiveness can be employed to design a high-performance PM motor for portable electric power drills in this paper. To find the most suitable combination of the geometric parameters of a brushless PM motor with skewed magnets to achieve the design goal, the RSM with a QPSO operator is employed. The 3-D finite element method (FEM) is employed as the tool for analyzing the cogging torque and performance of the proposed PM motor. The experimental results show that the proposed method can obtain the best combination of the geometric parameters for reducing the cogging torque and enhancing the operating efficiency.