The frequency changing start up process of generating unit actually is a synchronous driving process under the action of electromagnetic moment of the stator and rotor of motor.
机组变频起动过程，实际上是电动机依靠定子和转子的电磁力矩作用的同步驱动过程。
2
The driving force of the rotor is driven by the belt drive, coupling and self driving.
拖动转子的传动方式有圈带拖动，联轴器拖动和自驱动。
3
Dust effects when driving over certain surfaces, rotor downwash effects for helicopters and VTOL aircraft.