ANALYSIS OF ELECTROMAGNETIC CHARACTERISTICS OF NOVEL TUBULAR PERMANENT MAGNET BRUSHLESS DC LINEAR MOTOR FOR MEDICAL EQUIPMENT, 25-31.
Guiyang Xu and Jianxin Zheng
Keywords
Electromagnetic property, linear motor, tubular brushless DC motor, novel structure
Abstract
The cogging force and end force of the permanent magnet (PM)
brushless DC linear motor are the main factors that generate
magnetic drag force. The generation of magnetic drag force can lead
to the occurrence of thrust fluctuations, and large thrust fluctuations
can cause vibration and noise characteristics of the linear motor,
hindering its development and application. Therefore, the novel
tubular PM brushless DC linear motor is proposed, by adding
additional magnetic guide ring at the end of the PM, the magnetic
path of the motor is improved, increasing the output thrust of
the motor while reducing thrust fluctuations, which can be better
applied to medical machinery equipment. Firstly, the topology and
basic working principle of the tubular PM brushless DC linear
motor are investigated, then the electromagnetic characteristics of
the PM brushless DC linear motor are analysed, such as air-gap
magnetic density, flux linkage, winding current, rated output thrust,
etc. Finally, the prototype and comprehensive testing platform are
established, the thrust value is measured, and compared with the
finite element simulation values, the rationality of the tubular PM
brushless DC linear motor is verified by finite element method
calculation and test.
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