讨论滑动摩擦力作功，说明了滑动摩擦力可以使刚体的平动动能和转动动能之间相互转换，但总是作负功。
It is pointed out that translational kinetic energy and rotational kinetic energy mutually transferred by sliding friction force, but it only has positive acting.
励磁电流与传递力矩、单位转动惯量传递的力矩等成指数关系，与功率损耗成负指数关系。
The exciter current an exponential relationship with transmitted torque, torque by unit moment of inertia and viscous power loss.
励磁电流与传递力矩、单位转动惯量传递的力矩等成指数关系，与功率损耗成负指数关系。
The exciter current an exponential relationship with transmitted torque, torque by unit moment of inertia and viscous power loss.
应用推荐