Fault analysis of three phase induction motor

Winding is part of the motor, aging, moisture, heat, erosion, foreign body intrusion, the impact of external force will cause damage to the winding, motor overload, under voltage, over voltage, lack of operation can also cause winding failure. Winding faults are generally divided into winding ground, short circuit, open circuit, wiring error. Now the failure phenomenon, the cause of the phenomenon, and inspection methods. Grounding of the winding and the core of the core or the insulation of the housing.

Causes: damp winding insulation resistance decreased; long-term overload operation of the motor; corrosion of harmful gas; metallic foreign body intrusion internal winding insulation damage; rewind stator winding insulation damage when touch core; winding end touch base of the end cover; stator, rotor friction caused by insulation burns; lead wire insulation damage and shell collision; over voltage (such as lightning) makes the dielectric breakdown.

Fault phenomenon: the case of charged, control circuit, winding short-circuit heating, resulting in the motor can not run normally.

Industry focus

With the deterioration of the environment, the lack of resources, energy conservation and environmental protection concept is becoming more and more deep into the economic and social development, all countries in the energy saving technology and the promotion of investment. Along with China’s “Twelfth Five Year” energy saving and environmental protection industry planning, the introduction of energy saving and environmental protection has been pushed up a new height. According to the investment adviser released by the 2011-2015 in China’s energy efficiency motor industry investment analysis and forecast report shows that the total capacity of the motor installed capacity has reached more than 4 KWh, the annual electricity consumption of 1.2, accounting for 60% of the total electricity consumption, including the total installed capacity of wind turbines, pumps, compressors, the annual consumption of 800000000000 KWh, accounting for 40% of the total electricity consumption. Most of these motors are running in the lower power utilization rate, as long as the electric energy utilization rate of these motors can be improved by 10 to 15%, at least 10000000000 KW can be saved for the whole year. Enough to see the great potential and importance of the motor energy saving market. Motor energy consumption phenomenon is serious, not only increased the cost of production, resulting in a great waste of electric energy, but also with the implementation of China’s energy-saving emission reduction strategy is not consistent. At present, the energy consumption of motor can be effectively changed by improving the operation efficiency of the motor, the energy saving effect is very obvious, and the energy consumption can be reduced by 20% to 30% compared with the ordinary motor. Motor energy saving the main way, one is by the frequency conversion speed control system, improve the efficiency of the frequency conversion motor two is the use of high efficiency motor.