2018年7月26日，27日に，東京の自動車会館にて，電気学会モータドライブ・回転機・自動車合同研究会が開催され，研究成果を発表しました．
タイトル：ベアリングレスブロアモータの巻線統合化
内 容：12スロット10極の表面磁石形モータを，これまで支持巻線（三相8極）と電動機巻線（三相10極）を用いてベアリングレス駆動してきましたが，この論文では，両巻線を1種類の四相巻線に統合し，さらに四相を非対称に配置して，この統合巻線に支持電流と電動機電流を重畳するベアリングレス駆動方式を提案しています．
Abstract：For hybrid electric vehicles and pure electric vehicles, noise and vibration of a heating, ventilating, air-conditioning (HVAC) system should be reduced for comfortable driving improvement. One of the primary reasons for the noise and vibration is a blower motor mounted in the HVAC unit. The mass unbalance of the rotor generates serious centrifugal force, increasing with the square of the rotational speed. The force is mechanically transmitted to the HVAC unit body, resulting in significant noise and vibration generation at the resonance point of the HVAC unit body. One possible solution is to employ an active magnetic bearing or a bearingless motor, which can control the radial force of the rotor and hence can drive the rotor at the center of inertia, resulting in no unbalance force transmission to the HVAC unit body. Compared with a magnetic bearing, a bearingless motor can make the blower motor structure simpler, because the radial force control function is magnetically integrated into the motor. Conventional bearingless motors, however, have separated winding configuration which includes two independent windings for torque and suspension force generations in the stator. Hence, it has lower torque density, because the suspension winding occupies in the stator slot area. To improve the torque property, several combined winding configurations have been previously developed, where the suspension and motor windings are combined into one set of winding. This paper introduces a novel and simple combined winding configuration for a bearingless blower motor with four-phase 12-slot/10-pole structure.
