Low voltage three phase asynchronous motors' efficiency classes in the power range 0.75kW to 375kW:
IE1= Standard Efficiency
IE2= High Efficiency
IE3=Premium Efficiency
IE4=Super Premium Efficiency
And how done to increase efficiency?
In order to meet the new efficiency legislation, engineers have redesigned products with higher copper content.
using magnetic slot wedge instead of the original slot wedge. Asynchronous motor in no-load iron loss is reduced by magnetic slot wedge, no-load additional iron loss is caused by slot effect in the motor harmonic magnetic flux is generated in the stator and rotor core. The stator and rotor in the core sense of the consumption of additional iron loss high frequency called pulsation loss. Also stator and rotor tooth sometimes positive and sometimes staggered, tooth surface gear cluster flux changes, in the line of tooth surface layer eddy current, loss of surface. Pulsating loss and surface loss, collectively referred to as the additional high frequency loss, which accounted for 70% to 90% of the stray loss of the motor, the addition of 10% ~ 30% said to load additional loss is generated by the leakage magnetic flux. Although the use of magnetic slot wedge will make the starting torque is decreased by 10% to 20%, but the magnetic slot wedge motor than the ordinary Slot Wedge motor iron loss can reduce the 60K and are so well adapted no-load or light load start motor transformation.
Using an automatic conversion device of Y/ delta. For the equipment to solve the light load of electric energy waste phenomenon, under the premise of the non replacement of the motor can be automatic switching device to achieve energy saving objective using Y /]. Because of the three-phase alternating current, the voltage obtained by the different methods of the load is different, so the energy absorbed from the power grid is also different.
Motor power factor reactive power compensation. To improve the power factor and reduce the power loss is the main purpose of reactive power compensation. Power factor is equal to the active power and apparent power. Usually, the power factor is low, resulting in the current is too large, for a given load, when the supply voltage is certain, power factor is low, current, the greater the. So the power factor is as high as possible to save energy.
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