Studying and Measuring System for Motor Base Unbalance

Abstract

This paper presents the importance of motor base vibration measurements; different faults which can appear during motor running and how the motor base unbalance and vibration influence the whole system vibration. The electrical and mechanical faults influence the normal functioning of the motor, increase the power consumption, the current, more heat is generated and vibrations are growing too. Balancing is important requirement for motors and all rotating components. An electrical and/or mechanical unbalance affects other parts of the motor or system. A weak motor base is one of the vibration sources which can be detected with vibration transducers. A 3-axis accelerometer was used to detect motor vibration for a small DC motor fixed on different types of base in different manner. A virtual instrument was developed to acquire and analyze the vibration. Analyzing the frequency spectra of the vibration the weak motor base and improper fixing of the motor was highlighted which appear in horizontal direction. Knowing the rotating frequency the measured and analyzed data was compared with the reference data. It is shown that sideband frequencies appear around the fundamental frequency which means an anomaly due to improper motor base.