Optimal Layout Method of Multiple Vibration Sensors Based on Motor Vibration Frequency Response

Purpose The optimal measurement points for the vibration characteristics of the motor under different faults may be inconsistent, which results in the problem that the motor cannot obtain reliable vibration signals during fault diagnosis or condition monitoring. However, the existing research seldom considers the influence of the installation position of the vibration sensor on the diagnosis effect. Therefore, this paper proposes an optimal layout method for vibration sensors based on the frequency response of motor vibration. Methods This paper analyzes the air gap magnetic field of the motor and obtains the changes of the radial electromagnetic force wave of the motor under normal operation, eccentric operation and broken rotor bars operation. Electromagnetic excitation is applied to the motor model and different base constraints are set to obtain the three-dimensional vibration characteristics of the shell under normal operation, eccentric operation and broken rotor bars operation. According to the vibration characteristics of the shell, the vibration laws under different working conditions are obtained. According to the three-dimensional vibration characteristics of the motor, the optimal vibration measurement points are selected and a new type of vibration sensors layout scheme is designed. Conclusion The results showed that the motor has different vibration optimal measuring points under different operating states. In addition, the identification and diagnosis of motor faults can be realized through the joint analysis of multiple vibration sensors after the optimized layout.