A New Axial-Flux Motor Becomes a Supercar Staple

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• ‌High – efficiency power conversion‌: Axial flux motors have a shorter magnetic flux path, usually resulting in an efficiency of over 96%. In automotive transmissions, this high – efficiency characteristic means that more of the electrical energy can be directly converted into mechanical energy, reducing energy loss during the transmission process. For example, in hybrid vehicles, when the axial flux motor is used in combination with the internal combustion engine, it can more effectively assist the engine in driving the vehicle, improving the overall fuel efficiency of the vehicle.
• ‌Compact size and space optimization‌: The axial size of axial flux motors is relatively short. In automotive transmissions, this allows for more flexible layout within the limited space of the vehicle. For instance, in electric vehicles with a distributed electric drive system, axial flux motors can be easily integrated into the wheel hubs or other compact spaces, optimizing the use of the chassis space. This can also lead to a more streamlined design of the vehicle’s underbody, improving aerodynamic performance.
• ‌High – torque output‌: Axial flux motors can provide high – torque density. In automotive applications, this means that the motor can generate a large amount of torque even at low speeds. In a transmission system, this high – torque characteristic can reduce the need for complex gear – shifting mechanisms in some cases. For example, in low – speed heavy – duty applications such as off – road vehicles or construction vehicles, the high – torque output of the axial flux motor can directly drive the vehicle without requiring multiple gears to amplify the torque.
• ‌Potential for simplified transmission structure‌: Due to the high – torque and high – efficiency characteristics of axial flux motors, it is possible to simplify the traditional transmission structure. In some electric vehicles, a single – speed or dual – speed transmission may be sufficient when using an axial flux motor, reducing the number of components and the complexity of the transmission system. This not only reduces the manufacturing cost but also improves the reliability of the transmission system.
• ‌Enhanced vehicle performance‌: The combination of high – efficiency, high – torque, and compact size of axial flux motors can enhance the overall performance of the vehicle. For example, in sports cars, the rapid response and high – torque output of the axial flux motor can provide faster acceleration, while the compact size allows for a lower center of gravity, improving the vehicle’s handling and stability.

However, there are also some challenges in the application of axial flux motors in automotive transmissions. For example, the (in the original text, it should be “heat dissipation”) challenge due to the long heat – dissipation path requires optimization of the design, such as using composite materials for the rotor or active cooling systems. Additionally, the relatively high cost due to complex manufacturing processes may also limit their widespread application in the short term. But as technology continues to advance and production scales up, these issues are expected to be gradually resolved.

Application of automotive axial flux motors

• ‌High – performance vehicles (such as super – sports cars)‌:
  • ‌High torque density‌: Axial flux motors can provide high torque density. In super – sports cars, this means the ability to achieve rapid acceleration. The unique structure of axial flux motors allows for a more efficient conversion of electrical energy into mechanical energy, enabling the vehicle to reach high speeds in a short time.
  • ‌Compact size‌: Their compact design is beneficial for super – sports cars where space is often limited. By using axial flux motors, car manufacturers can optimize the layout of the power system within the vehicle, making room for other important components or improving the overall aerodynamic performance.
• ‌Electric and hybrid vehicles‌:
  • ‌Improved energy efficiency‌: For electric and hybrid vehicles, energy efficiency is crucial. Axial flux motors can contribute to higher system efficiency. For example, some motor and controller systems using axial flux motors can reach an efficiency of 95.2%, and the high – efficiency area of the system can exceed 90% under the full working range. This means longer driving ranges for electric vehicles and better fuel – electric conversion efficiency for hybrid vehicles.
  • ‌Variable speed range‌: These motors have a variable speed range, which is essential for electric and hybrid vehicles to adapt to different driving conditions, such as urban traffic with frequent starts and stops, and highway driving requiring high – speed and stable operation.
• ‌Commercial vehicles‌:
  • ‌Heavy – duty applications‌: Axial flux motors are suitable for various commercial vehicles, including 6X4 tractors, 6X4 dumpers, 8X4 dumpers, concrete mixers, 6X4 highway tractors, mining trucks, and city buses. In these heavy – duty applications, the high – power and high – torque characteristics of axial flux motors can meet the demanding power requirements. For example, in mining trucks, they can provide the necessary power to transport heavy loads over complex terrains.
  • ‌Low – speed operation‌: For low – speed commercial vehicles like sanitation vehicles, axial flux motors can offer stable and reliable power output at low speeds, ensuring the normal operation of these vehicles during their daily work tasks.

In summary, the application of automotive axial flux motors is diverse, ranging from high – performance sports cars to environmentally – friendly electric and hybrid vehicles, as well as heavy – duty commercial vehicles, due to their unique advantages in terms of torque density, efficiency, size, and adaptability.