以下为句子列表：
英文: According to the actual working condition of the electric motor on ground drive screw pump, two kinds of new motors are proposed, that is the gearshift multi-power single speed motor and speed regulating pole change motor.
中文: 摘要根据地面驱动螺杆泵电动机的实际工况，提出了分挡多功率单速和变极调速2种新的电动机设计方案。
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英文: Single speed motor drive connected to a Helical Worm Gear and a totally enclosed Connecting Gear Box with heavy duty chain drive to the rolls and with fixed friction ratio according to customers request (normally 1: 1,2).
中文: 系统带有同螺旋涡齿轮以及全封闭齿轮箱的单速马达，它带有重型链传动系统并可根据客户的需要固定摩擦比（通常为1:1.2）。
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