日本五十铃汽车公司与住友金属公司联合研制成一种采用铁-钕-硼永久磁铁的大型商用汽车用电动减速器。 目前使用的减速器有两种类型:一种是流体动力减速器,它把驱动轴的机械能转换成流体的动能。这种减速器结构相当紧凑,但很复杂,反应速度慢,难以与变速箱配合,同时它也使汽车变速装置增加约200kg的重量;另一种是电动减速器,它采用安装在定子盘上的励磁线圈和一对转子,给励磁线圈通电而产生磁场,在转子中感应出涡流,从而产生制动 Japan’s Isuzu Motors Corp. and Sumitomo Metal Co., Ltd. jointly developed an electric reducer for large commercial vehicles using iron-neodymium-boron permanent magnets. There are two types of decelerators currently used: one is a hydrodynamic retarder that converts the mechanical energy of the drive shaft into kinetic energy of the fluid. This reducer is quite compact but complex, slow to respond and hard to work with the gearbox, and it adds about 200kg to the car’s transmission; the other is an electric retarder, which is mounted on a stator disk Of the excitation coil and a pair of rotor, the excitation coil energized to produce a magnetic field induced in the rotor eddy current, resulting in braking