Research of high frequency magnetic field interference on the eddy current sensor

The non-contact eddy current sensor was used spread in the inverter- motor driving system to measure the vibration and rotate speed of the motor. But the electromagnetic environment is very complex in the inverter driving system, the sensor output should be affected by the electromagnetic interference. According to the MIL-STD-461F RS101, the upper frequency of magnetic field sensitivity measurement is normally 100kHz., it is not enough in high-power inverter-motor driving system because there are strong magnetic field interferences in MHz. A rotating speed sensor was researched in this paper, the interference effects were analyzed and the solutions were proposed. The analysis was verified by the experiment.