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While converting electric energy into mechanical energy, the electric motor itself also consumes a part of energy. The loss of the oil pump motor can be generally divided into three parts: variable loss, fixed loss and stray loss. What should I do if the oil pump motor is high? Don't worry, Dalan Motor has a big move!
1. Variable loss is a function of load, including stator resistance loss (copper loss), rotor resistance loss, and brush resistance loss.
2. Fixed losses are independent of load, including core loss and mechanical loss. The iron loss is composed of hysteresis loss and eddy current loss, which is proportional to the square of the voltage, and the hysteresis loss is also inversely proportional to the frequency.
3. Other stray losses are mechanical losses and other losses, including bearing friction losses and windage losses due to rotation of fans, rotors, etc.
Stator loss
The main methods to reduce the stator I^2R loss of the motor are:
1. Increase the cross-sectional area of ​​the stator slot. In the case of the same outer diameter of the stator, increasing the cross-sectional area of ​​the stator slot will reduce the magnetic circuit area and increase the magnetic density of the tooth.
2. Increasing the full slot ratio of the stator slot, which is effective for low-voltage small motors. The applied winding and insulation dimensions and the cross-sectional area of ​​large wires can increase the full tank rate of the stator.
3. Minimize the length of the end of the stator winding. The loss of the end of the stator winding accounts for 1/4~1/2 of the total loss of the winding. The length of the end of the winding is reduced, which can improve the efficiency of the motor. Experiments have shown that the end length is reduced by 20% and the loss is reduced by 10%.
Rotor loss
The loss of the motor rotor I^2R is mainly related to the rotor current and the rotor resistance. The corresponding energy-saving methods are as follows:
1. Reduce rotor current, which can be considered from two aspects: increasing voltage and motor power.
2. Increase the cross-sectional area of ​​the rotor slot.
3, reduce the resistance of the rotor winding, such as the use of thick wires and low resistance materials, which is more meaningful for small motors, because small motors are generally cast aluminum rotors, if cast copper rotors, the total motor loss can be reduced by 10% ~15%, but today's cast copper rotors require high manufacturing temperatures and technology is not yet widely available, and their cost is 15% to 20% higher than cast aluminum rotors.
Core loss
The motor iron consumption can be reduced by the following measures:
1. Reduce the magnetic density and increase the length of the core to reduce the magnetic flux density, but the amount of iron used in the motor increases.
2. Reduce the thickness of the iron chip to reduce the loss of induced current. For example, replacing the hot-rolled silicon steel sheet with cold-rolled silicon steel sheet can reduce the thickness of the silicon steel sheet, but the thin iron chip will increase the number of iron chips and the manufacturing cost of the motor.
3. Use cold-rolled silicon steel sheet with good magnetic permeability to reduce hysteresis loss.
4, the use of high performance iron chip insulation coating.
5, heat treatment and manufacturing technology, the residual stress after processing the iron chip will seriously affect the loss of the motor. When the silicon steel sheet is processed, the cutting direction and the shear stress have a great influence on the core loss. It can be realized by cutting along the rolling direction of the silicon steel sheet and heat-treating the silicon steel sheet to reduce the loss by 10% to 20%.
Spurious loss
Today's understanding of motor stray losses is still in the research stage. Some of the main methods to reduce stray losses today are:
1. Use heat treatment and finishing to reduce the short circuit of the rotor surface.
2. Insulation treatment of the inner surface of the rotor slot.
3. Reduce harmonics by improving stator winding design.
4, improve the rotor groove fit design and coordination to reduce harmonics, increase the stator and rotor slots, design the rotor slot shape as a chute, the use of serial sinusoidal windings, scattered windings and short-distance windings can greatly reduce high-order harmonics; It is an effective method to reduce the additional stray loss by replacing the traditional insulating wedge with magnetic groove mud or magnetic wedge and filling the stator core slot of the motor with magnetic groove mud.
Wind and friction loss
Wind and wind loss accounts for about 25% of the total motor loss, which should be taken seriously by people. Friction losses are mainly caused by bearings and seals and can be reduced by:
1. Minimize the size of the shaft, but meet the requirements of output torque and rotor dynamics.
2. Use energy efficient bearings.
3. Use energy efficient lubrication systems and lubricants.
4. Adopt advanced sealing technology.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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