In the existing agricultural motors, some of them are old models with low efficiency, various losses, low power factor and high waste power. These motors can take the following energy saving measures to improve.
For the continuous running motor, if the load rate is above 60%, the running time is more than 3000 hours a year, and the high efficiency motor should be used. The total loss of the domestic YX series high efficiency and energy saving motor is 25.8% lower than that of the Y series. The total copper consumption is 20%, the iron loss consumption is 10%, the miscellaneous consumption is 30%, the wind friction loss is 40%, and the efficiency is increased by 3%. When the load rate is 50%-100%, the motor has a relatively flat efficiency characteristic, and the efficiency is the highest at 75%. The cost of increasing the high efficiency motor can be compensated in the short term electricity saving cost, and a large amount of electricity can be saved every year.
If we consider more investment at a time and idle after the old motor is replaced, we can reduce the loss of motor to improve the efficiency of motor in the motor repair process.
When repairing Standard Motors, the standard of high efficiency motors can be reduced to motor efficiency by reducing motor losses. The total loss should be reduced by 20%-30% compared with the original motor, and the power factor is no less than the original motor level.
In the rewind coil of the motor, increase the conductor cross-sectional area can reduce the copper loss and improve the efficiency of the motor, but increased the weight of copper, copper due to heavy repair caused by increased costs, increase the cost of electromagnetic wire can rely on electricity savings in the short term to repay.
In the motor winding wire rewinding, with copper and aluminum, conditions of coil form, turns and wire cross-sectional area at the same time, the stator copper loss is about half of the original aluminum wire.
When the cast aluminum cage rotor is repaired, a copper strip can be used to weld the structure. The loss of eddy current loss and iron loss caused by the lateral leakage current of the rotor can be reduced and the loss of the rotor copper and the additional loss can be reduced. If conditionally re cast aluminum, the insulating paint can be applied to the inner wall of the rotor iron slot, so that the contact resistance between the aluminum guide bar and the core will increase, and the stray loss can be reduced by about 11%. Sanitary pump
In order to reduce the ventilation loss, a high efficiency fan can be used. When the air volume and wind pressure of the motor are constant, the ventilation loss is inversely proportional to the fan efficiency. If the efficiency of the big knife type or the pot fan is about 20%, the efficiency of the high-efficiency airfoil axial flow fan can be reduced to about 30% of the original efficiency of about 67%.
The operation efficiency and power factor of the old agricultural models of motor processing these measures have greatly improved, energy saving and cost effect.
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