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首页> 外文会议>World Energy Engineering Congress (WEEC) null null >A Simple and Reliable Variable Speed Drive Technology Resolves Premature Motor Failure and Power Quality Issues
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A Simple and Reliable Variable Speed Drive Technology Resolves Premature Motor Failure and Power Quality Issues

机译：一种简单可靠的变速驱动技术解决了过早的电动机故障和电能质量问题

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Variable Frequency Drives (VFD's), or Inverters, have become the universally accepted method of variable speed control of AC motors and their respective loads. The most common type of VFD used today is the PWM (pulse width modulated) inverter. It is the popular choice because of its excellent operating efficiency and lower front end costs compared to other types of variable frequency speed control methods. The PWM drive however, has proven to be one of the leading sources of noise and motor related problems in variable speed drive applications. Many technical papers have been written recently identifying the reasons for the problems and offering solutions, yet the same concerns that are directly associated with PWM drives continue and to this day have not been totally resolved. The leading issues with PWM drives today are: 1. Motor winding failure 2. Motor bearing currents (premature bearing failure) 3. Current harmonics and voltage distortion (affect on facilities power quality) 4. Additional motor heating (shortened motor life) 5. Low end operating speed range limitation 6. Distance limits between motor and drive 7. Nuisance dropouts 8. Retrofits: cannot reliably use existing motors 9. When to use line filters, isolation transformers, bypass disconnects, and special inverter rated wiring or cable 10. Highly skilled service level requirements This paper addresses an alternative method of reliable, efficient, and economical variable speed control of the load where none of the above listed issues are applicable. Also provided is a simple explanation of the basic principle of operation, a look at the developmental history of the magnetic coupled variable speed drive, the latest advances and improvements in the technology, the benefits, and the successful use of this technology in numerous and diverse applications.
机译：变频驱动器（VFD）或变频器已成为公认的交流电动机及其各自负载的变速控制方法。今天使用的最常见的VFD类型是PWM（脉宽调制）逆变器。与其他类型的变频调速方法相比，它具有出色的工作效率和较低的前端成本，因此是最受欢迎的选择。然而，事实证明，PWM驱动器是变速驱动器应用中与噪声和电机相关的主要问题之一。最近写了许多技术论文，指出了问题的原因并提供了解决方案，但是与PWM驱动器直接相关的相同问题仍在继续，直到今天仍未完全解决。当今，PWM驱动器的主要问题是：1.电动机绕组故障2.电动机轴承电流（轴承过早失效）3.电流谐波和电压畸变（影响设施的电能质量）4.电动机额外发热（电动机寿命缩短）5。低端运行速度范围限制6.电动机与驱动器之间的距离限制7.有害干扰8.改造：无法可靠地使用现有电动机9.何时使用电源滤波器，隔离变压器，旁路开关和变频器额定的特殊电线或电缆10。高度熟练的服务水平要求本文提出了一种适用于负载的可靠，高效和经济的变速控制的替代方法，在上述方法均不适用的情况下。还提供了基本操作原理的简单说明，电磁耦合变速驱动器的发展历史，该技术的最新进展和改进，该技术的益处以及在众多领域中的成功使用应用程序。

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