The iron core is also the magnetic core. The iron core (magnetic core) plays a pivotal role in the entire motor. It is used to increase the magnetic flux of the inductance coil and realize the maximum conversion of electromagnetic power. The motor core is usually composed of a stator and a rotor. Among them, the stator core is the main component of the motor magnetic circuit. The stator core is punched out of silicon steel sheet. The iron core is also the part where the winding is placed. When the generator is running, the iron core will be subjected to the combined effects of mechanical force, thermal stress and electromagnetic force.
Market size
In 2020, China's automotive motor core market will reach US$175.83 million, and it is expected to reach US$678.83 million in 2027, with a compound annual growth rate (CAGR) of 17.32%. On the whole, China's automotive motor core industry is a rising industry, because its downstream electric vehicles are expected to grow faster, and we expect that the automotive motor core industry will usher in greater growth in the future.
Product type
From the perspective of product type and technology, welded iron core has the fastest growth rate. The market size in 2020 is 62.78 million US dollars, and it is expected to reach 678.83 million US dollars in 2027. Bonded iron cores accounted for the highest proportion, with a market size of US$78.85 million in 2020, accounting for 44.84% of the total market for automotive motor iron cores. After that, the proportion gradually decreased. This is because from the perspective of technology development trends, bonded iron cores Will gradually be replaced by welded iron core.
1. Welded iron core
Welded cores are laminations joined by welding seam technology. Welding processes mainly include: argon arc welding, gas shielded welding, resistance welding, etc., which have the advantages of mature technology, low cost, low requirements for laminations, and low requirements for equipment. However, its disadvantages are obvious, such as a large thermal reaction zone, which reduces the performance of the motor; it is not environmentally friendly; it has high requirements for workers to operate; it has flaws in appearance and rough welds. At present, laser welding can reduce the shortcomings of welding iron cores to a certain extent, but it is mainly used in small iron cores.
2. Interlocking iron core
The interlocking iron core uses automatic stacking riveting technology on the progressive die. The forming process of the interlocking iron core is to make the raised part of the stacking riveting point of the previous piece correctly align with the stacking riveting point of the lower piece at the punching and blanking station. The parts of the concave holes overlap together. When the upper piece is subjected to the pressure of the blanking punch, the lower piece uses the reaction force generated by the friction between its shape and the wall of the die to make the two pieces rivet. Through the continuous punching of high-speed automatic punching machine, a neat iron core with a certain stack thickness is formed. The interlocking iron core stacking points include: cylindrical stacking points, V-shaped stacking points, L-shaped stacking points, trapezoidal stacking points, etc.
3. Bonded core
The bonded iron core is bonded with glue, replacing the traditional welding and riveting methods. The purpose of this improvement is to improve the electromagnetic performance of the motor and reduce iron damage to the stator and rotor cores. Bonded cores are ideal for ultra-thin laminations, and the glue holds the stack together without lamination distortion. The adhesive between the bonded iron core steel plates forms an insulating layer, which can significantly reduce electromagnetic losses, and the bonded iron core has stronger shock resistance and waterproof performance.
Applications
From the perspective of product market application, pure electric vehicles account for a relatively high proportion. In 2020, the market size will account for 84.07% of the total market for automotive motor cores. The research team believes that hybrid electric vehicles are transitional products and will be gradually replaced by pure electric vehicles in the future. It is expected that the proportion of pure electric vehicles will continue to rise slowly in the next few years.
1. Hybrid electric vehicles
Hybrid electric vehicles refer to vehicles equipped with more than two power sources, including motor-driven vehicles, which comply with automobile road traffic and safety regulations. The unit, the current hybrid electric vehicle generally refers to an electric vehicle with a diesel locomotive generator and a battery.
2. Pure electric vehicles
A pure electric vehicle refers to a vehicle powered entirely by rechargeable batteries. A vehicle that uses motors to drive the wheels and meets the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic, but the current technology is still immature.
The automobile motor core is a key component of the new energy automobile motor. Analysis of the current policy environment of the industry, energy conservation, environmental protection, and electronic information technology are the key development directions of the auto parts manufacturing industry in the future. In recent years, due to the aggravation of environmental pollution, the state has formulated a policy to promote the development of new energy vehicles. The development and production of parts and components are the key to the development of new energy vehicles. Therefore, in the development policy of new energy vehicles formulated by the state, the relevant regulations on the development of auto parts are emphasized, which also regulates the development of my country's auto parts industry to a certain extent. This is conducive to promoting the continuous and standardized development of the automotive motor core industry.
Influence of Policy Environment on Automobile Motor Iron Core Industry
From the country's various industrial plans, to energy conservation and emission reduction requirements, to the strategy of manufacturing a strong country, iron cores, as the core components of automotive motors, are key areas of support in my country. The country will inevitably encourage the development of high-tech automotive motor cores, thereby driving the development of my country's energy-saving and environmentally friendly high-end equipment industry, putting forward higher requirements for the manufacturing industry of automotive motor cores, playing a leading role in the development of the industry, and contributing to the operation of enterprises Development brings important strategic opportunities.