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Low cost speed controller for small AC motors

机译:小型交流电机的低成本速度控制器

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The article introduces simple and low cost PWM speed controller for the fractional power AC motors (less than 500 W). Variable speed settings are normally required to match the load requirement, reduce acoustical noise, and energy savings in blenders, air blower etc. In the proposed circuit, one transistor and a diode bridge are configured to vary the AC supply across the motor. Switching the transistor ON and OFF at a fast rate results in variable AC voltage. By using the proposed circuit. the PWM modulated AC supply has high frequency harmonic of which the first harmonic is dependent on the operating switching frequency. This in turn makes filtering the harmonics a simple task. Comparison between the phase controls circuits normally adopted for speed control with the proposed controller was investigated using PSpice models.
机译:本文介绍了适用于小功率交流电动机(小于500 W)的简单且低成本的PWM速度控制器。通常需要变速设置来满足负载要求,降低声学噪声并节省搅拌机,鼓风机等的能量。在建议的电路中,一个晶体管和一个二极管电桥被配置为改变整个电动机的交流电源。快速开关晶体管会产生可变的交流电压。通过使用建议的电路。 PWM调制交流电源具有高频谐波,其一次谐波取决于工作开关频率。反过来,这使得滤除谐波成为一项简单的任务。使用PSpice模型研究了通常用于速度控制的相位控制电路与建议的控制器之间的比较。

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