We all know that textile screw air compressors will also wear out while running, and the motor is the most seriously damaged. Motor losses are generally divided into three types: fixed losses, stray losses and variable losses. So how to reduce the motor losses of textile screw air compressors? Let me briefly talk about it with you:
1. Stator loss
Increasing the stator slot full rate, which is better for low-voltage small motors. The application of winding and insulation size, large wire cross-sectional area can increase the stator full slot rate;
Increasing the stator slot cross-section, under the same outer diameter, increasing the stator slot cross-sectional area will reduce the magnetic circuit area and increase the tooth magnetic density;
Try to shorten the stator winding end length. The stator winding end loss accounts for 1/4 to 1/2 of the total winding loss. Reducing the winding end length can improve the motor efficiency.
2. Rotor loss
The I^2R loss of the motor rotor is mainly related to the rotor current and rotor resistance. The loss can be reduced mainly by the following methods:
Increase the cross-sectional area of the rotor slot;
Reduce the resistance of the rotor winding, such as using thick wires and low-resistance materials, which is more useful for small motors;
3. Core loss
Reduce the magnetic density and increase the length of the core to reduce the magnetic flux density. It should be noted that the amount of iron used in the textile screw air compressor motor will also increase;
Use cold-rolled silicon steel sheets with good magnetic conductivity to reduce hysteresis loss;
Use high-performance iron core insulation coating;
The thickness of the iron core can be reduced to reduce the loss of induced current;
Heat treatment and manufacturing technology;
4. Stray loss
Use heat treatment and finishing to reduce rotor surface short circuit;
Insulation treatment of the inner surface of the rotor slot;
Reduce harmonics by improving the stator winding design;
Improve the rotor slot matching design and match to reduce harmonics, increase the stator and rotor tooth slots, design the rotor slot shape into skew slots, use series-connected sinusoidal windings, distributed windings and short-distance windings to greatly reduce high-order harmonics; Use magnetic slot mud or magnetic slot wedges to replace traditional insulating slot wedges, and use magnetic slot mud to fill the stator core slots of the motor, which is a method to reduce additional stray losses;
5. Wind friction loss
Wind friction loss accounts for a large proportion of the total loss of the motor, and we must pay attention to it in our daily work. There are mainly the following reduction measures for wind friction loss:
Reduce the size of the shaft, and pay attention to meeting the requirements of output torque and rotor dynamics;
Use lubrication system and lubricant;
Use high-performance bearings;
Use advanced sealing technology;