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首页> 外文期刊>Journal of power electronics >Extending Switching Frequency for Torque Ripple Reduction Utilizing a Constant Frequency Torque Controller in DTC of Induction Motors
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Extending Switching Frequency for Torque Ripple Reduction Utilizing a Constant Frequency Torque Controller in DTC of Induction Motors

机译：通过在感应电动机的DTC中使用恒定频率转矩控制器来扩展开关频率以降低转矩纹波

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摘要

Direct torque control (DTC) of induction machines is known to offer fast instantaneous torque and flux control with a simple control structure. However, this scheme has two major disadvantageous, namely, a variable inverter switching frequency and a high torque ripple. These problems occur due to the use of hysteresis comparators in conventional DTC schemes, particularly in controlling the output torque. This paper reviews the utilization of constant frequency torque controllers (CFTC) in DTC to solve these problems while retaining the simple control structure of DTC. Some extensions of the work in utilizing a CFTC will be carried out in this paper which can further reduce the torque ripple. This is particularly useful for a system which has a limited/low sampling frequency. The feasibility of a CFTC with an extended carrier frequency in minimizing the torque ripple is verified through experimental results.
机译：众所周知，感应电机的直接转矩控制（DTC）可通过简单的控制结构提供快速的瞬时转矩和磁通量控制。然而，该方案具有两个主要缺点，即可变的逆变器开关频率和高的转矩脉动。这些问题是由于在常规DTC方案中使用磁滞比较器而发生的，特别是在控制输出扭矩时。本文回顾了DTC中恒定频率转矩控制器（CFTC）的使用，以解决这些问题，同时保留DTC的简单控制结构。本文将对使用CFTC的工作进行一些扩展，以进一步降低转矩脉动。这对于采样频率有限/较低的系统特别有用。通过实验结果验证了具有扩展载波频率的CFTC在最小化转矩波动中的可行性。

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