The analysis and design of a NdFeB permanent-magnet spindle motor for CD-ROM drive

This paper presents a blushless permanent-magnet (PM) DC motor for use as t he spindle motor in Compact-Disk Read-Only-Memory (CD-ROM) drive. The propo sed motor is a slotted stator and an outer-rotor which uses a high energy m agnet, neodymium-iron-boron (NdFeB) for excitation. The design and optimiza tion of the motor was done with the aid of electromagnetic field analysis b ased on the finite element method. Computational and experimental results o f the motor are included.