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为满足新一代动车用牵引电动机减少维修、延长拆检里程、降低噪声、提高效率的要求，日本开发出了新式全封闭型牵引电动机，它可以防止外部尘埃的侵入，从而延长其维修期，并将机内噪声遮断于机壳内以降低走行噪声，利用动车的走行风使冷却装置设计得更合理，同时新型牵引电动机还采用了机壳内空气循环冷却方式、油润滑式轴承、耐高温磁化楔铁等新技术。
In order to meet the demand of a new generation of traction motors for motor vehicles to reduce maintenance, extend inspection clearance, reduce noise and improve efficiency, Japan has developed a new fully enclosed traction motor that can prevent the intrusion of external dust and thereby extend its maintenance period. The noise in the machine is cut off in the cabinet to reduce the running noise. The use of the traveling wind of the motor car makes the cooling device more reasonable. Meanwhile, the new traction motor also adopts the air circulation cooling method in the cabinet, the oil lubricated bearing, the high temperature magnetization Wedge iron and other new technologies.