联合收割机、四轮驱动拖拉机、风钻机、农用轨道拖车、捆草机、播种机……这些农业机械的总价值大约为22万美元。

Combined harvesters, four-wheel drive tractors, wind rig, agricultural rail vehicles, bundle of grass machine, machine... These agricultural machinery's total value is about 22 million dollars.

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新式车辆部件包括驱动装置，发电拖车车轮，电动自行车前轮装置。

The mechanism consists of driving device, generator trailer wheel, bicycle front wheel device.

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由于拖车的运行主要是控制系统通过控制电动机驱动它而运行的，因此本文主要研究电机及其控制系统部分，对于系统中其他组成部分在设计中仅做简要的介绍。

The tow truck is driven by the control motors in the control system, so the research of this paper will focus mainly on the motors and their related control units.

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