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Bearing current, EMI and soft switching in induction motor drives: A systematic analysis, design and evaluation.

机译：感应电动机驱动器中的轴承电流，EMI和软开关：系统分析，设计和评估。

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摘要

This dissertation proposes a unified theory to explain bearing current, EMI and other phenomena in induction motor drives. The theory is based on recognition of parasitic capacitive coupling and common mode voltage generation in a drive system. The high dv/dt differential and common mode voltages of an inverter provide excitation to the parasitic coupling circuit of the drive system and produce a significant amount of the so called coupling current in the system.;The coupling current is defined as the sum of currents flowing in all parasitic capacitors of a motor drive which is different from the well-known fundamental and harmonic currents. The motor bearing current is a common mode component of the coupling current which flows through parasitic capacitors from the motor windings to the rotor and then via the bearings to the grounded motor case. The emissions from a drive system can also be explained by flow of the coupling current into the utility AC source.;Experiments are then carried out to verify the theory. Bearing currents are measured on a modified induction motor. A model of bearing currents is also established to describe the phenomenon. Several suppression methods and circuits are proposed to reduce the conducted EMI emissions and the bearing currents in an induction motor drive. The results not only clarify some of the long suspected issues regarding existence of bearing currents and mechanisms of EMI emissions but also provide effective solutions to the problems.;Another important contribution of the dissertation is to evaluate the soft switching technology for reducing bearing currents and EMI emissions. The state of the art in soft switching inverters is reviewed. To overcome some of the problems in the conventional resonant link inverters, a novel passively clamped quasi resonant DC link inverter is proposed and built to provide a low dv/dt excitation to induction motors. The soft switching inverter is then extensively tested and evaluated in terms of bearing currents, coupling currents and other performances.
机译：本文提出了一个统一的理论来解释感应电动机驱动中的轴承电流，EMI和其他现象。该理论基于对驱动系统中寄生电容耦合和共模电压生成的识别。逆变器的高dv / dt差分和共模电压会为驱动系统的寄生耦合电路提供激励，并在系统中产生大量的所谓耦合电流;耦合电流定义为电流之和电流流入电动机驱动器的所有寄生电容器中，这与众所周知的基波和谐波电流不同。电动机轴承电流是耦合电流的共模分量，该耦合电流通过寄生电容器从电动机绕组流到转子，然后通过轴承流到接地的电动机壳体。驱动系统的辐射也可以通过耦合电流流入市电交流电源来解释。然后进行实验以验证该理论。在改进的感应电动机上测量轴承电流。还建立了一个轴承电流模型来描述这种现象。提出了几种抑制方法和电路，以减少感应电动机驱动器中的传导EMI辐射和轴承电流。结果不仅澄清了一些长期存在的关于轴承电流和EMI辐射机理的怀疑问题，而且为解决这些问题提供了有效的解决方法。论文的另一重要贡献是评估了软开关技术以降低轴承电流和EMI。排放。回顾了软开关逆变器的最新技术。为了克服常规谐振链路逆变器中的一些问题，提出了一种新型的无源钳位准谐振直流链路逆变器，该逆变器被构造为向感应电动机提供低dv / dt激励。然后对软开关逆变器进行了广泛的测试，并根据轴承电流，耦合电流和其他性能进行了评估。

著录项

  • 作者

    Chen, Shaotang.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 234 p.
  • 总页数 234
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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