Abstract
Today, major industrial countries have developed various applications of high-performance electric motors; and, they all endeavored to stabilize the motor’s performance. Among the applications, development in PM motors has become prominent in many successful examples. In the design of PM motors with high performance, minimizing power losses is critical to the final efficiency. Hence, the use of fractional-slots with concentrated windings for the reduction in the length of the winding wires is to minimize the copper resistance losses. Since direct-drive motors exhibit stable rotation, low vibration noises, high torque accuracy, high reliability with long service life, high position accuracy and etc. Commonly, the applications are found for high output torque and high responses at lower operational speed. The objectives of the thesis are to study PM type direct drive motors used in mechanical rotation tables. From basic motor design methodology to analysis of design parameters and CAE simulations, optimized slots/poles combination and windings has been adopted for high positional accuracy. First, CAE commercial software packages, namely RMxprt® and Maxwell 2D/3D® copyrighted by ANSYS Inc., have been adopted for calculation of physical parameters and simulation of the magnetic field distribution. Then, a commercial PM direct drive motor has been experimentally tested for verifications in static and dynamic performance. The thesis could provide a design reference for the electric machinery industry.