How to reduce motor iron loss?

Method of reducing iron loss in engineering design

The most fundamental way is to know the reason for the large iron consumption, whether the magnetic density is high or the frequency is large or the local saturation is too serious and so on. Of course, in accordance with the normal way, on the one hand, it is necessary to approximate the reality as much as possible from the simulation side, and on the other hand, the process coordination technology reduces the additional iron consumption. According to the most common way is to increase the use of good silicon steel sheet, for different application scenarios have a better product classification.

1.Optimized magnetic circuit

Optimizing the magnetic circuit, specifically optimizing the sinusoidal properties of the magnetic field. This is very critical, not only for fixed-frequency induction motors to do. Variable frequency induction motor synchronous motor is crucial. I once made two motors with different performance in order to reduce costs in the textile machinery industry, of course, the most important thing is that there is no inclined pole, resulting in the sinusoidal inconsistency of the air gap magnetic field. Because the work is in high-speed conditions, the iron consumption accounts for a relatively large, so the loss of the two motors is very large, and finally, after some columns of backward calculation, because the iron consumption of the motor under the control algorithm is more than 2 times. It also reminds you that when you do frequency conversion speed regulating motor, you must coupling control algorithm to do it.

2.Decrease magnetic density

The most fundamental way is to know the reason for the large iron consumption, whether the magnetic density is high or the frequency is large or the local saturation is too serious and so on. Of course, in accordance with the normal way, on the one hand, it is necessary to approximate the reality as much as possible from the simulation side, and on the other hand, the process coordination technology reduces the additional iron consumption. According to the most common way is to increase the use of good silicon steel sheet, for different application scenarios have a better product classification.

3.Optimized magnetic circuit

Optimizing the magnetic circuit, specifically optimizing the sinusoidal properties of the magnetic field. This is very critical, not only for fixed-frequency induction motors to do. Variable frequency induction motor synchronous motor is crucial. I once made two motors with different performance in order to reduce costs in the textile machinery industry, of course, the most important thing is that there is no inclined pole, resulting in the sinusoidal inconsistency of the air gap magnetic field. Because the work is in high-speed conditions, the iron consumption accounts for a relatively large, so the loss of the two motors is very large, and finally, after some columns of backward calculation, because the iron consumption of the motor under the control algorithm is more than 2 times. It also reminds you that when you do frequency conversion speed regulating motor, you must coupling control algorithm to do it.

4.Decrease magnetic density

Increase the length of the iron core or increase the magnetic conductivity area of the magnetic circuit to reduce the magnetic flux density, but the amount of iron used by the motor will increase accordingly;

5.Reduce the thickness of the iron chip to reduce the loss of induced current

If the cold-rolled silicon steel sheet is used instead of the hot-rolled silicon steel sheet, the thickness of the silicon steel sheet can be reduced, but the thin iron core sheet will increase the number of iron chips and the manufacturing cost of the motor.

6.The cold-rolled silicon steel sheet with good magnetic permeability is used to reduce hysteresis loss

7.High performance iron chip insulation coating

8.Heat treatment and manufacturing technology

9.The residual stress after the iron chip machining will seriously affect the loss of the motor, and the cutting direction and punching shear stress have great influence on the loss of the iron core during the silicon steel sheet machining. Cutting along the rolling direction of the silicon steel sheet and heat treatment of the silicon steel punching sheet can reduce the loss of 10% to 20%.