A Torque Discontinuity Free New Hybrid PWM Approach for High Speed Induction Motor Drives

H. Rehman, R. Mahmood, Taimoor Shah
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引用次数: 1

Abstract

This paper designs a hybrid speed controller in which a Sine Triangle Pulse Width Modulated (SPWM) inverter is used below the base speed and a square wave inverter is employed above the base speed. The two inversion techniques complement each other for their advantages and disadvantages below and above the base speed. This paper proposes a unique strategy for the transition between SPWM and square wave by simply setting the frequency of the carrier signal equal to zero. The proposed methodology in a way uses only one inversion technique and realizes a seamless transition from the SPWM to square wave compared to conventional method in which modes are simply switched from SPWM to square wave and vice versa when the speed changes above and below the base speed, respectively. Computer simulations show that the proposed technique has smoother torque transition and thus a better speed response compared to conventional approach of inverter mode switching around the base speed. The performance of proposed hybrid approach is also validated on a small prototype induction motor through experimental results.
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一种无转矩不连续的新型混合PWM高速感应电机驱动方法
本文设计了一种混合速度控制器,在基本速度以下采用正弦三角脉宽调制(SPWM)逆变器,在基本速度以上采用方波逆变器。这两种反演技术在基本速度以下和以上各有优缺点,互为补充。本文提出了一种在SPWM和方波之间转换的独特策略,即简单地将载波信号的频率设置为零。该方法在某种程度上只使用了一种反演技术,实现了从SPWM到方波的无缝转换,而传统方法在速度高于基本速度和低于基本速度时分别简单地从SPWM切换到方波,反之亦然。计算机仿真结果表明,与传统的围绕基本转速进行逆变器模式切换的方法相比,该方法具有更平稳的转矩转换和更好的速度响应。并在小型感应电机样机上进行了实验验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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