Flat wire motor
The driving motor is mainly composed of stator assembly, rotor assembly, end cover and auxiliary standard parts, and the stator winding includes iron core, copper wire winding, insulation material and so on. The flat wire motor, as the name implies, adopts flat copper wire in the stator window. First, the winding is made into the same shape as the card, pierced into the stator slot, and then welded to the end of the card at the other end.
Advantages and disadvantages of flat wire motor
The difference between the flat wire motor and the circular wire motor lies in the forming mode of the copper wire. The flat wire is beneficial to the improvement of the slot filling rate of the motor. The slot filling rate of the general circular wire motor is about 40%, while that of the flat wire motor can reach more than 60%. The increase of slot filling rate means that more copper wires can be filled with the same space, resulting in stronger magnetic field intensity and increasing power density.
The contact area between flat wires is larger, and the thermal conductivity is better and the temperature rise is lower than that of circular wire motor. Some data show that the temperature rise of flat wire motor is about 10% lower than that of circular wire motor.
In addition, the flat wire motor can also improve the utilization rate of copper wire by saving the end copper material, so as to reduce the cost.
Application of flat wire motor
In the long run, miniaturization and high speed will be the main development trend of new energy vehicle motor, and miniaturization will inevitably require a significant increase in motor power density.
In addition, the high speed brings about the promotion of the heat dissipation of the motor, and the cooling mode also tends to adopt oil cooling. The flat wire motor can make the cooling oil contact with the heat source as much as possible.