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

研制了麦克斯韦力型自轴承电动机。然而，PM类型1要求薄的PM，这导致严重的问题，例如高制造成本和退磁。为了克服这些问题，我们提出了洛伦兹力型自轴承电机。该类型可用于电机领域的厚PM。首先，我们研制了六集中绕组控制的圆筒型八极内转子电动机。制作了实验装置，证实了强悬浮旋转。同样的理论也适用于4极电机。我们还通过使用外转子实验装置进行了实验验证，该装置可运行至5，500 rpm。为了将这种电机应用于小型主轴，如人工心脏或硬盘主轴，需要强大的外转子电机。因此，设计并制造了Halbach磁体阵列。这些结果表明，自轴承电机可以实现径向两个方向的控制。提出了一种新的磁悬浮轴承，利用永磁体内部偏置，实现了对其它方向的控制，并利用差动Transformer实现了磁悬浮轴承的自检测。通常，估计的数据受到控制信号的相反影响。在工业应用方面，我们正在研制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.