Proposal and experimental study on permanent magnet-type transverse flux synchronous machines with a disk rotor for large torque direct drives

直接驱动电机解决方案在从混合动力汽车到电动船舶的电机应用中变得越来越重要。新型永磁同步电动机（PMSM），如横向磁通电机是一个有吸引力的选择，因为这种应用的高转矩特性。因此，本文提出了一种适用于电力船舶的C芯型横向磁通永磁同步电动机，并对其进行了理论和实验研究。该电机在研究初期存在齿槽转矩大、电阻转矩大等问题。因此，我们提出了更高的性能，在横向磁通型永磁同步电动机的电动船舶，特别是专注于减少齿槽转矩和最大化转矩的方法。我们已经建立了一个原型电机具有低齿槽转矩特性，采用精心设计的极-芯组合。对磁路法在空间约束下的最大转矩法进行了理论研究。我们同时研究了在我们的原型实验台上将电流型双采样率观测器应用于低速驱动控制的可能性。实验结果证明了电流型双采样率观测器对大极数同步电机低速驱动控制的有效性。为了进一步开发大扭矩电机，我们正在继续研究基于简化磁路计算的电机设计方法。

Direct drive motor solutions are becoming increasingly important in electric motor applications from hybrid vehicles to electric ships. New type permanent magnet synchronous motors(PMSMs) such as a transverse flux machine are an attractive option for such applications because of high torque characteristics. Hence a C-core type transverse flux PMSM for electric ships has been proposed and studied theoretically and experimentally in this research. This motor had some critical problems such as high cogging torque and unexpectedly large resistance torque in our early study stage. We have, therefore, proposed the methods for higher performance in a transverse flux type PMSM for electric ships, especially focusing on reducing cogging torque and maximizing torque. We habe built a prototype motor with low cogging torque characteristics using carefully designrd pole-core combination. Maximizing torque method under the space constraint using magnetic circuit method has been theoretically investigated. We have simultaneously investigated possibility of applying the current type dual sampling rate observer to low speed drive controls in our prototype experimental bench. Experimental results demonstrate validity of low speed driving control of the proposed synchronous motor with large number of poles with the current type dual sampling rate observer. For further development of large torque machines, we are continuing invstigations on machine designe methodology based on siplified magnetic circuit calculations.