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首页> 外文会议>2012 IEEE 5th India International Conference on Power Electronics. >A novel switching scheme for Three phase PWM AC Chopper fed induction motor
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A novel switching scheme for Three phase PWM AC Chopper fed induction motor

机译：三相PWM交流斩波感应电动机的新型切换方案。

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摘要

AC Voltage Controllers are finding important application in speed control of induction motors, light dimmers, heat controllers and soft starters. AC Chopper is an arrangement of bi-directional switches to control the output voltage by varying the duty-cycle of operation of the switches involved. In this paper, a new switching scheme for three phase ac chopper is discussed which requires only three variables for converting the fixed input ac voltage to a controlled ac voltage. The added advantage is that this scheme takes into account the safe operation of the ac chopper by preventing short-circuit conditions. At the same time it provides a path to the motor current when the terminal voltage falls to zero. Implementation of the proposed scheme leads to much simpler control circuitry than discussed in the literature. A Three phase 3HP induction motor-fed from three phase ac chopper is used for the work. The simulation results confirm the improvement in power factor, leading to power savings.
机译：交流电压控制器在感应电动机，调光器，热控制器和软起动器的速度控制中发现重要的应用。交流斩波器是一种双向开关，通过改变相关开关的工作占空比来控制输出电压。在本文中，讨论了一种新的三相交流斩波器开关方案，该方案仅需三个变量即可将固定输入交流电压转换为受控交流电压。另一个优点是，该方案通过防止短路情况考虑了交流斩波器的安全运行。同时，当端子电压降至零时，它为电动机电流提供了一条路径。所提出的方案的实现导致比文献中讨论的控制电路简单得多的控制电路。使用由三相交流斩波器供电的三相3HP感应电动机进行工作。仿真结果证实了功率因数的改善，从而节省了功率。

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