两年前，开发了一种轻量化的采用永久磁铁的直接驱动的牵引电动机与车轮一体化的装置。开发这种电动机的目的是为了获得低的噪声、低的维修和高的效率。为了降低重量，我们利用了为电动机磁场所需的高性能的永久磁铁。在此情况下，牵引电动机是一个无弹簧支撑的物体，这样它的坚固耐用性就产生了疑问。这次对其进行了高达100万次的冲击耐久性试验，从而断定这些电动机是足够坚固耐用的。 Two years ago, a lightweight, wheel-driven traction motor with a permanent magnet was developed. The purpose of developing such a motor is to obtain low noise, low maintenance and high efficiency. In order to reduce weight, we utilize the high-performance permanent magnets required for the motor’s magnetic field. In this case, the traction motor is a non-spring supported object, so its ruggedness raises questions. This time it was up to one million times the impact durability test, thus concluding that these motors are strong enough durable.