11 - Quality Systems and Testing of Electrical Machines

Abstract

Quality systems assure better product reliability; builds customer confidence by relieving them from constant checks to ensure the required quality and timely delivery, particularly for custom-built and engineering products; improves a company's image and goodwill; enhances competitiveness and acceptability in national and international markets, where many other brands may already be available; and reduces wastage and rework and improving productivity. The purpose of testing an electrical motor is to ensure its compliance with the norms of design, material inputs, and manufacturing accuracy. It determines the mechanical soundness and electrical fitness of the machine for its electrical and mechanical performance. T testing methods include electrical measurements, type tests, routine tests, and test for seismic disturbances. Tests on load are conducted to determine the performance of the machine, such as its efficiency, power factor, speed, and temperature rise. The no-load test is a very informative method to determine the no-load current, core and pulsation losses, friction and windage losses, magnetizing current and the no-load power factor. The test also reveals mechanical imbalance, if any, performance of the bearings, vibration, and noise level of the motor.