Development of a High Speed Permanent Magnet Motor for Driving Embroidery Machines

This paper presents the development of a high speed PM brushless DC motor for driving embroidery machines. In the design of the motor, the magnetic field finite element analysis (FEA) was conducted to calculate the key motor parameters such as the air gap flux, back electromotive force (emf), and inductance, etc. Based on the numerical magnetic field analysis, a modified incremental energy method (MIEM) is introduced to effectively calculate the self and mutual inductances of the stator windings. The motor prototype has been constructed and tested with both a dynamometer and a high speed embroidery machines, which validates successfully the theoretical calculations.