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怎样区分变频电动机与普通电动机?
2020-12-10 14:50:00
来源:wangjian
怎样区分变频电动机与普通电动机?
1、变频电机在其转速范围内可任意调节,不会损坏电机。大多数普通电动机只能在额定电压和工频50赫兹的条件下运行。普通电动机虽然可以减频或加频使用,但范围不能太大,否则电动机会发热甚至烧毁。在实际应用中,在风机、水泵等的节能改造中,经常采用变频器来驱动普通电动机。
2、普通电机的散热系统不同于变频电机。普通电动机的冷却系统与转速密切相关。换言之,如果马达的转速很快,冷却系统就会正常工作。如果电机转速慢,冷却效果差,但变频电机的风扇由单独的电源供电,则不存在这种问题。
3、由于采用逆变器供电,电机可以在很低的频率和电压下以无冲击电流模式启动,逆变器提供的各种制动模式可用于快速制动,增强了电机对频繁启动和制动的适应性。
4、变频电机能直接在线启动吗?答案是否定的,因为绕组导线的载流能力不是按直接起动和正常过载能力设计的,直接启动电流太大,容易烧毁电机。
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