March 2002

Rotating Equipment/Reliability

Understand AC induction motor vibration

Use these guidelines to diagnose mechanical and electrical problems

Mansoor, A., Qatar Fertilizer Company

Squirrel cage, 3-phase AC induction motors are the most common prime movers in the process industries. This is chiefly because of their generally low cost, reasonable size, ruggedness, low maintenance and easily available power supply. Being very reliable, these drives are often given less importance in machinery management programs (MMP), and sometimes developing malfunctions are ignored. The fact is that electric motors can fail in the same manner as many other types of machinery. AC induction motors are ignored in an MMP for many reasons, a common one being the electromechanical nature of most motor faults. This creates misunderstanding as to whose job it should be to track

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