Intelligent Over-vibration Protection Modeling & Simulation For Three Phase Induction Motor

Abstract

This paper presents an intelligent over-vibration simulation and protection preference for three phase medium and high power induction motor. Three phase induction motor is widely used in industry because they are rugged, reliable and economical.Monitoring and over-vibration protection of machines can avoid consequential damage and avoid its consequences.The effect of three main different abnormal operating cases which are rotor unbalance,shaft coupling misalignment and torque pulsations on the rotor vibration are examined.The results are collected and evaluated for motor status. Rotor unbalance and shaft coupling misalignment will cause radial vibrations,while torque pulsations will cause torsional vibrations.The vibration analysis and simulation is calculated using matlab(m-file)to produce the different vibration waves.Fuzzy logic technique is utilized in determining machine vibration source ,and if vibration displacement (r.m.s) at bearing exceeds limits,then fuzzy will feed a relay to trip machine.The fuzzy is programmed by the output of the simulation(m-file). A case study of 5100 kW motor was used in rotor vibration modeling,rotor stiffness and damping values were calculated. Fuzzy logic as an artificial intelligence technique can be used as a vibration monitoring and protection tool.

Keywords

• induction motor
• vibration modeling
• fuzzy