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首页> 外文会议>Technology evolution: sensors to systems for failure prevention >INTERFERENCE OF VARIABLE FREQUENCY DRIVE (VFDS) ON ROTATING MACHINE FAULT DIAGNOSIS USING VIBRATION ANALYSIS
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INTERFERENCE OF VARIABLE FREQUENCY DRIVE (VFDS) ON ROTATING MACHINE FAULT DIAGNOSIS USING VIBRATION ANALYSIS

机译：振动分析中的可变频率驱动（VFDS）对旋转机械故障诊断的干扰

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摘要

VFDs are the most commonly used modes to drive induction motors in applications requiring speed variations. However, vibration analysis for fault diagnosis of such systems poses serious challenges as the signatures are complicated due to the inherent design of the VFD. This paper will explain the basic operation of a typical VFD and present vibration signatures of machines operated using VFDs. VFDs control motor speed by varying the frequency of supply line frequency. This is done in three stages. Firstly, the line voltage signal is rectified to obtain a DC signal. This is then smoothened and finally, the constant DC voltage is used to construct a pseudo AC voltage using a set of transistors, which act like switches (gates). The switching frequency, or carrier frequency, interferes with vibration signal. The vibration signal as a result of using the VFD contains discrete frequencies spaced at the carrier frequency and its harmonics. Each peak also contains sidebands around the carrier frequency (and its harmonics) spaced at both the rotor speed and the VFD frequency. There can be side bands associated with other rotational discrete frequencies such as gears and gearmesh frequencies. Analysts examining high frequency content of their data signals needs to be aware of the carrier frequencies and the side bands of their VFD. By understanding these issues one use them for diagnostics purposes.
机译：在需要变速的应用中，VFD是驱动感应电动机的最常用模式。然而，由于VFD的固有设计，由于签名复杂，用于这种系统的故障诊断的振动分析提出了严峻的挑战。本文将解释典型VFD的基本操作，并介绍使用VFD运行的机器的振动信号。 VFD通过改变电源线频率来控制电动机速度。这分三个阶段完成。首先，对线电压信号进行整流以获得直流信号。然后将其平滑，最后，恒定的直流电压用于通过一组晶体管来构造伪交流电压，这些晶体管的作用类似于开关（栅极）。开关频率或载波频率会干扰振动信号。由于使用VFD而产生的振动信号包含离散频率，该离散频率与载波频率及其谐波间隔开。每个峰值还包含围绕载波频率（及其谐波）的边带，这些边带以转子速度和VFD频率间隔开。可能存在与其他旋转离散频率（例如齿轮和齿轮啮合频率）相关的边带。分析其数据信号高频成分的分析人员需要了解其VFD的载波频率和边带。通过了解这些问题，可以将它们用于诊断目的。

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