名词
中文翻译：交变极电机
同义词：
['variable-speed motor', 'variable-frequency motor']
例句：
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1. The commutating pole motor is essential for the operation of the machine.
交变极电机是机器运行所必需的。
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2. The variable-speed motor allows for precise control over speed and torque.
可调速电机允许精确控制速度和扭矩。
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3. The variable-frequency motor is commonly used in industrial applications where precise timing is required.
可变频电机常用于工业应用中，需要精确定时的场合。