High efficiency and energy saving motor technology in the development of industry
From the perspective of energy conservation and environmental protection, high efficiency motor is nowadays the international development trend, the United States, Canada, Europe, subsequently issued relevant laws and regulations. Europe according to the running time of the motor, make the efficiency can be divided into eff1 CEMEP standard (highest), eff2, eff3 (minimum) at three levels, from 2003-2006, step-by-step implementation. The latest IEC60034-30 standard motor efficiency can be divided into IE1 (corresponding eff2), IE2 (corresponding eff1), IE3, IE4 (highest) four levels. Our commitment from July 1, 2011 executive IE2 and above standard.
At present, the industrial energy consumption accounts for about 70% of the total energy consumption, including motor energy consumption accounted for about 60% ~ 70% of the industrial energy consumption, and non-industrial motor energy consumption, motor above the actual energy consumption accounts for about 50% of the total energy consumption, and the high efficiency and energy saving motor application rate is low. According to the national quality supervision and inspection center for domestic key enterprises of small and medium-sized motor sample up to 198 sets motor, of which more than 2 levels of high efficiency and energy saving motor proportion was only 8%, it made a tremendous waste of social resources to the whole.
Institutions have done calculation, if all the motor efficiency increased by 5%, it can save electricity for the whole year of 76.5 billion KWH, this number is close to the three gorges electricity in the whole year of 2008. So development space is large, the demand of energy saving motor industry. Policy, the national standardization management committee in 2012, issued a mandatory standard GB18613-2012 small and medium-sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency level ".
Efficient motor energy saving measures
Motor energy saving is a systematic project, involving motor of the whole life cycle, from the design, manufacture of the motor to motor selection, operation, adjustment, repair, scrap, to the entire life cycle from the motor considering the effect of energy saving measures, main consideration in this respect at home and abroad from the following several aspects to improve efficiency.
Design is using the optimization design of energy-saving motor technology, new material technology, control technology, modern design means such as integration technology, test technology, reduce the power loss of the motor, improve the efficiency of the motor, design a efficient motor.
Motor at the same time of converts electrical energy into mechanical energy, itself also loss of energy, a typical ac motor loss in general can be divided into fixed loss, variable loss and stray loss of three parts. Variable loss is changing with load, including stator resistance loss, copper loss), rotor resistance loss and brush resistance loss; Fixed loss has nothing to do with the load, including the core loss and mechanical wear and tear. Iron loss is composed of magnetic hysteresis loss and eddy current loss, and is proportional to the square of the voltage, the hysteresis loss also is inversely proportional to the frequency; Other stray loss is mechanical loss and other loss, including bearing friction loss and the fan, rotor caused by the rotating wind resistance loss.