Ningbo Hongda Motor Die Co. Ltd.
宁波鸿达电机模具有限公司
Hongda self bonding -Latest research and development lamination bonding technology!
The stator and rotor cores of the motor are made of silicon steel sheets laminated together to minimize eddy current loss. The self-adhesive core is formed by bonding laminations together with adhesive. The choice of lamination technology depends on motor design and economic considerations. The lamination process is divided into the technology in the stamping process (self fastening, spot welding and self-adhesive) and the technology downstream of the stamping process (welding, rivet and self-adhesive).
At present, the biggest problem faced by new energy vehicles is the range. In order to make electric vehicles go further without increasing the existing battery capacity, the efficiency of the motor must be improved. Recently, the Ministry of industry and information technology and the State Administration of market supervision and Administration jointly issued the motor energy efficiency improvement plan (2021-2023), which also requires to improve efficiency. A prerequisite for improving energy efficiency is the use of low loss industrial steel with high permeability, coupled with core lamination technology, which greatly affects the performance of electrical steel in the motor.
Use Hongda self-adhesive core to optimize performance and efficiency:
Freedom of design: the electrical engineer is allowed to design freely to achieve the ideal motor performance without considering manufacturing factors, such as the position of self buckle or weld. This makes it possible to design more efficient and energy-saving motors.
Better dimensional accuracy and mechanical strength: due to the expansion caused by the lamination without self buckle, smaller tolerance and shape stability can be controlled. In the process of self bonding, there will be no tension in the welded part of the iron core due to the introduction of heat in welding.
Keep magnetism: bonding has no effect on the magnetic properties of electrical steel. In contrast, self buckling and welding will seriously damage the microstructure and thus damage the magnetism of the material.
Excellent thermal conductivity: improve the heat dissipation by improving the heat transfer between the lamination and the shell, so that the cooling devices can become smaller, making them lighter, smaller and lower cost. It also has excellent stacking performance and good insulation effect, which can realize electrical short-circuit protection.
Acoustic advantages: the self-adhesive core can effectively suppress the vibration in the lamination to minimize the sound level.
Conclusion: as a new generation of stacking technology, self bonding and all its advantages are particularly suitable for high requirements and applications in the field of electric vehicles. This technology has been widely used in other important scenes: wind power, rail transit, electric aircraft, electric ship, aerospace, etc.