Reduce the loss of current flowing through the winding.
One of the most direct ways to improve motor efficiency is to reduce armature winding losses. For example, by increasing the groove area so that more copper is used to increase the section area of the winding and then reduce its resistance, so that the loss of current flow over the winding is reduced.
The control of the loss of iron core.
The core loss is related to two factors: magnetic flux density and frequency in the core. Usually the power frequency is fixed, so in order to reduce the core loss, the iron core is usually adopted.
The improvement of efficiency is closely related to material consumption.
In order to achieve the required level of energy consumption, it is inevitable to increase the volume of copper and iron core. However, the decrease in loss is not always positively related to the increase in consumption of copper and iron. When the core and coil section increase to a certain extent, the loss will increase, because the enlargement of the core volume will also increase the loss of the core and coil, and the efficiency will decrease if the reduction of the core and the coil is greater than that caused by the decrease of resistance and the unsaturation of the iron core. There may be such a point that the loss will increase actually when the core volume is increased. Similarly, for a certain magnetic flux density, the eddy current loss can be reduced by using thinner laminations.
Technological innovation improves efficiency.
Breaking through the technical forbidden area of closed slot rotor and cast copper rotor, the motor efficiency level will get a qualitative leap.
Efficiency increases at the cost of more effective material consumption, but because of the existence of effective materials such as copper wire and iron core, all kinds of losses are unavoidable. The product of the loss value produced by the unit material and the product of the total material consumption have a minimum value under certain relatively stable conditions to achieve the minimum value or the process of optimal design. It is the traditional way to improve efficiency, how to improve relative stability, enhance material quality, break through the bottleneck of traditional technology and so on, depending on innovative technology.