Vocation;
Teclmology;
College,;
Hebei;
Normal;
University,;
Shijiazhuang;
050031,;
P.;
R.;
China;
School;
of;
Mechanical;
Engineering,;
Beijing;
Institute;
of;
Technology,;
Beijing;
100081,;
P.;
R.;
China;
牵引电机; 实验; 电动车; 张力; 一般工业; 电动汽车; 频繁启动; 噪声源;