MCIA Research Group, Universitat Politècnica de Catalunya, C. Colom 1, Terrassa, 08222 Catalunya, Spain.
Sensors (Basel). 2011;11(3):3356-80. doi: 10.3390/s110303356. Epub 2011 Mar 21.
Double frequency tests are used for evaluating stator windings and analyzing the temperature. Likewise, signal injection on induction machines is used on sensorless motor control fields to find out the rotor position. Motor Current Signature Analysis (MCSA), which focuses on the spectral analysis of stator current, is the most widely used method for identifying faults in induction motors. Motor faults such as broken rotor bars, bearing damage and eccentricity of the rotor axis can be detected. However, the method presents some problems at low speed and low torque, mainly due to the proximity between the frequencies to be detected and the small amplitude of the resulting harmonics. This paper proposes the injection of an additional voltage into the machine being tested at a frequency different from the fundamental one, and then studying the resulting harmonics around the new frequencies appearing due to the composition between injected and main frequencies.
双频测试用于评估定子绕组和分析温度。同样，感应电机上的信号注入也用于无传感器电机控制领域，以找出转子位置。电机电流特征分析（MCSA）侧重于定子电流的频谱分析，是识别感应电机故障最广泛使用的方法。可以检测到电机故障，如转子断条、轴承损坏和转子轴偏心等。然而，该方法在低速和低转矩时存在一些问题，主要是由于待检测频率与产生的谐波的小幅度之间的接近。本文提出在与基频不同的频率下向被测电机注入附加电压，然后研究由于注入频率和主频率之间的组合而在新频率周围出现的谐波。
