With the development of new energy vehicle technology, cast aluminum rotors have been widely used in motors. The use of cast aluminum rotors can reduce the weight of the motor, increase the power/mass density, reduce the moment of inertia, and release greater starting torque, which is one of the reasons why it is widely used by new energy vehicle manufacturers.

The rotor under high-speed rotation provides strong power for the car, which requires us to have higher requirements for the strength and stiffness of the rotor material, so as to ensure the stable performance of the motor under high-speed operation, small vibration, and improve the reliability of the motor. At the same time, improve the quality of supporting vehicles.

With the technology update and iteration of new energy vehicles, auto manufacturers are also pursuing faster acceleration speeds, so high heat and huge centrifugal force at high speeds may cause changes in the geometry of pure aluminum cast rotors, which may easily cause motor vibration or The motor is swept and the motor is damaged. In a sense, the focus of the rotor performance and quality competition is on the production process and material selection of the rotor. 

At present, the two main processes for producing rotors are centrifugal casting aluminum and pressure casting aluminum. Centrifugal casting aluminum generally uses A00 aluminum. For most cast aluminum rotors, due to many factors such as casting aluminum process, ventilation and heat dissipation, and later balance, The aluminum end ring of the rotor has balance columns and wind blades. When the temperature of the motor rotor is high, the aluminum in the rotor will undergo fluidization deformation to varying degrees, especially at the end of the rotor. Severe twisting and deformation are very likely to occur in the state of high speed, and its final state is similar to the bag-throwing failure of the wound rotor. After all the blades are thrown out, they rub against the stator winding, causing the entire motor to burn out instantly.

When the die-casting aluminum alloy is used to make the motor rotor, the strength of the material is higher, but the conventional die-casting aluminum alloy is added with more alloy components, and the electrical conductivity and thermal conductivity are greatly reduced. Shenzhen Xinshen New Material Technology Co., Ltd. independently developed Die-cast aluminum alloys with conductivity close to that of pure aluminum may bring new solutions to the industry.

After the launch of this material, it has aroused the interest of many well-known manufacturers. It will be verified from 2021, and now the road test has passed, and it will be fully promoted on its new generation of vehicles.