名词
中文翻译：可变极电机
同义词：
['variable-speed motor', 'variable-frequency motor']
例句：
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1. The new pole-changing motor has significantly improved the efficiency of our production line.
新型可变极电机已显著提高了我们生产线的效率。
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2. The pole-changing motor is used to control the speed of the conveyor belt.
可变极电机用于控制输送带的速度。
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3. The pole-changing motor is an essential component in many industrial applications.
可变极电机是许多工业应用中不可或缺的组件。