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1. The new device is a commutator type frequency convertor that can quickly switch between two frequencies.
这款新型设备是一款交流器类型频率转换器，能够快速在两个频率之间切换。
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2. The engineer used the commutator type frequency convertor to adjust the speed of the motor.
工程师使用交流器类型频率转换器来调整电机的速度。
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3. The commutator type frequency convertor was designed to improve the efficiency of the electrical system.
交流器类型频率转换器的设计是为了提高电气系统的效率。