The Pumping unit has a double-chain synchronousdriving and reverse mechanism, and can realize flexible reverse with stroke increment;
抽油机具有双链条同步驱动换向机构，可实现增距式柔性换向；
2
The frequency changing start up process of generating unit actually is a synchronousdriving 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。
3
Driving is mainly regulated by frequency converter, with high driving accuracy of synchronous belt.