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Hairpin Motors Have an Advantage over Round Wire Motors

With the rapid development of new energy technologies, hairpin motors, as a high-performance driving device, are gradually receiving widespread attention. Compared with round wire motors, hairpin motors require more copper, mainly because hairpin of the same size occupy 1.78 times the volume of round wire motors, and the slot filling rate is higher. Although hairpin motors are more expensive to manufacture, they have a number of advantages that make them stand out from the competition with round wire motors.


Temperature Rise Control: The circular motor needs to use cold-rolled steel strip as the stator core material, and the cold-rolled steel strip has poor thermal conductivity, and the heat conduction from the stator to the rotor is not smooth, which makes it difficult for the circular motor to dissipate heat during operation, so the temperature rise control performance is not as good as hairpin motors. The stator core of the hairpin motor is made of silicon steel sheet with a thickness of 0.2mm, which has better magnetic permeability and smoother heat conduction from the stator to the rotor. In terms of temperature rise control, hairpin motors are 2-3°C lower than round wire motors.



Starting Torque: The performance of circular motors in the low speed range below 2000rpm is not as good as that of hairpin motors. This is because in the low-speed range, the density of magnetic force lines is the same, but the slot filling rate of circular motors is lower than that of hairpin motors, which means that the number of magnetic force lines excited per unit volume is less, and the density of magnetic force lines is insufficient, resulting in poor performance of performance indicators such as starting torque. 


Noise: The noise performance of circular motor is better than that of hairpin motor. This is because the air gap flux density of the circular  motor is higher than that of the hairpin motor, and the density of the magnetic force lines is higher. At the same speed, the air gap magnetic induction required by the circular motor is lower than that of the hairpin motor. The air gap magnetic induction intensity determines the size of the noise.


Weight: Hairpin motors are smaller in size and lighter in weight than circular motors due to the flat shape of the coils and windings. This enables the hairpin motor to better adapt to various application requirements in a limited space, especially in areas with high volume and weight requirements, such as new energy vehicles.


Performance: New energy hairpin motors have higher efficiency and power density through the use of advanced magnetic materials, fine windings and efficient control systems. In comparison, the new energy hairpin motor performs better in terms of energy conversion efficiency, dynamic response and power output. This gives hairpin motors a competitive edge in delivering higher performance drive capabilities and better system response.



Energy: Due to its high-efficiency energy conversion and precise control, hairpin motors can use electric energy more efficiently, reducing energy waste and environmental pollution. Compared with circular motors, this has lower energy consumption and smaller carbon footprint, which meets the requirements of sustainable development and environmental protection in today's society.


In the competition with circular motors, new energy hairpin motors have gradually gained market recognition by virtue of various advantages. With the further development of manufacturing technology and the reduction of cost, the new energy hairpin motor is expected to continue to expand its market share in the future and show greater innovation and competitiveness in various fields.

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