A study on magnetically-levitated micro PM motor using micro magnetic bearings

我们开发了一种带有毫米大小圆柱转子的磁悬浮微型永磁电机。两种类型的电磁铁应用于微型永磁电机。并对微型永磁电机的动态特性进行了研究。实验结果表明，与其他普通尺寸的永磁电机相比，这些微型永磁电机的驱动电流范围较小。采用马蹄形电磁铁的微型永磁电机的转速可高达【约等于】30000转/分以上，速度非常快，令人惊叹。与马蹄形电磁铁电机相比，圆柱形电磁铁微型永磁电机的驱动电流范围非常小。采用圆柱形电磁铁的微型永磁电机的磁摩擦比采用马蹄形电磁铁的电机的磁摩擦小得多。结果表明，对于高速旋转，采用马蹄形电磁铁的永磁电机比采用圆柱形电磁铁的永磁电机性能更好。从电耗的角度来看，由于驱动电流范围很小，采用圆柱形电磁铁的微型永磁电机优于采用马蹄形电磁铁的微型永磁电机。对于快速响应，马蹄形电磁铁的微型永磁电机优于圆柱形电磁铁的微型永磁电机。利用这一特性，证明了马蹄形电磁铁微型永磁电机的转子转速是可以控制的。微型永磁电机可应用于微型陀螺仪，机械传感器和其他应用。在微机电一体化领域具有广阔的应用前景。

We have developed a magnetically levitated micro PM motor with a millimeter-sized cylindrical rotor. Two types of electromagnets are applied to the micro PM motors. And the dynamic characteristics of the micro PM motors were investigated. From the experimental results, it is found that the driving current ranges of these micro PM motors are small in comparison to other normal-sized PM motors. The micro PM motor with horseshoe-shaped electromagnets increases up to speeds higher than 【approximately equal】30000 rpm, which is very fast and marvelous. The driving current range for the micro PM motor with cylindrical electromagnets is very small compared to that for the motor with horseshoe-shaped electromagnets. The magnetic friction for the micro PM motor with cylindrical electromagnets is very smaller than that for the motor with horseshoe-shaped electromagnets. From these results, it is found that for high speed rotations the micro PM motor with horseshoe-shaped electromagnets is better than that with cylindrical electromagnets. From the standpoint of electric power consumption, the micro PM motor with cylindrical electromagnets is better than that with horseshoe-shaped electromagnets because of the very small driving current range. For quick responses, the micro PM motor with horseshoe-shaped electromagnets is better than that with cylindrical electromagnets. Using this characteristic, it is shown that the rotor speed of the micro PM motor with horseshoe-shaped electromagnets can be controlled.The micro PM motor may be applied to micro gyroscopes, mechanical sensors, and other applications. It is regarded as promising for micro mechatronics.