Abstract
In this study, a new homopolar permanent-magnet (PM) linear tubular motor is designed, analyzed and optimized. Firstly, a mechanical structure of the linear oscillating motor (LOM) is proposed and the main working principles are introduced. A basic dynamic mathematic model of the motor is given. Secondly, the magnetic circuit of the motor is analyzed and equivalent magnetic modes are obtained to estimate the magnetic characteristic and force outputs. Thirdly, optimizations including the tooth stricter of the E-core stator, the size of the PM and the air gap length are carried out to improve the force output performance of the motor, increasing force outputs and reducing force ripples during the stroke. Finally, the motor prototype is manufactured according to the design and experimental tests involving force outputs and working efficiency are measured. The average force output and efficiency of the motor can achieve 60 N and 67 %, respectively. Results obtained by finite element method (FEM) and experiments prove the correctness of the design and the effectiveness of the LOM.
Highlights
Linear oscillatory motors (LOMs) are extensively employed in industrial applications and domestic appliances, such as wire bonders, air conditioners and refrigerators and so on
Switched reluctance motors have low efficiency and less force to volume ratio compared with permanent magnet (PM) motors, which means they are usually operated with low power density
In [15], two types LOMs with transverse flux are compared and the results showed that the thrust of the two methods is very similar
Summary
Linear oscillatory motors (LOMs) are extensively employed in industrial applications and domestic appliances, such as wire bonders, air conditioners and refrigerators and so on. A PM ring being axially magnetized is sandwiched by an iron core of the mover to produce two poles for the motor, as shown in Figure 1 (d). According to the flux line figure, the equivalent magnetic circuit of the motor can be plotted as shown in Figure 6 when the coils of the motor are not excited, neglecting local saturation condition In this figure, Ry and Rs are the magnetic reluctance of the yoke of the E-core stator and the back iron. The magnetic motive force drop in the iron cores Fdrop and the flux leakage effect of the motor need to be taken into account. It can be seen that the constant of the motor mainly depends on the magnetic flux density in the air gap, the radium of the mover and the coil turns of the stator. If the velocity of the mover is determined, the efficiency η of the motor can be estimated according to the equations (34)
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