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介绍了ＺＤ１１１Ｓ脉流牵引电动机的设计原则和难点，同时对主要参数的选择和电机结构特点作了说明，评价了各项设计指标．
The design principles and difficulties of ZD111S pulse current traction motor are introduced. At the same time, the selection of main parameters and the structural characteristics of the motor are described, and the design indexes are evaluated.