Development of Lorentz Force Type Self-Bearing Motor and Industry Application

研制了麦克斯韦力式自承式电机。然而，第一类磁体要求薄磁体，导致制造成本高、退磁等严重问题。为了克服这些问题，我们提出了洛伦兹力式自承式电机。该型号可用于汽车领域的厚粉末冶金。首先，我们研制了6个集中绕组控制的圆柱型8极内转子电机。建立了实验装置，确定了较强的悬浮旋转。同样的理论也适用于四极电机。我们还利用最高可达5,500转/分的外旋翼实验装置进行了实验验证。在人工心脏、硬盘轴等小型主轴上应用时，要求有较强的外转子电机。为此，设计并制作了Halbach磁体阵列。这些结果显示了稳定的悬浮和旋转，并在几次座谈会之前报道过。自承重电机可以控制径向双向。提出了一种新型的磁悬浮轴承，这种磁悬浮轴承可以控制其他方向，由于内部存在永磁偏置，所以效率非常高。通常情况下，估计数据会受到控制信号的反向影响。开发了线性化补偿技术，显示了更好的性能。为了实现工业应用，我们正在开发植入式人工心脏泵和化学泵。

Maxwel force type self-bearing motor has been developed. However, PM type one requests thin PM which causes serious problems such as high manufacturing cost and demagnetization. To overcome these problems we proposed Lorentz force type self-bearing motor. This type can use thick PM for motoring field. The fundamental operation has been confirmed.First we developed cylindrical type 8 pole inner rotor motor controlled by 6 concentrated windings. The experimental setup is made and the strong levitated rotation is confirmed. The same theory can be applicable to 4 pole motor. We also confirmed experimentally by using the outer rotor experimental setup which can run up to 5,500 rpm. For applying this motor to a small spindle such as artificial heart or hard disc spindle, strong outer rotor motor is requested. Hence a Halbach magnet array is designed and fabricated. These results show stable levitation and rotation and reported before several symposium.Self-bearing motor can control radial two directions. A new magnetic bearing is proposed which can control other directions and the efficiency is very good due to the internal PM bias.New self-sensing technique is also developed using the differential transformer. Usually estimated data is affected inversely by the control signal. Linearize compensation technique is developed which show better performance.For the industrial application we are developing the implantable artificial heart pump and chemical pumps.