Recently, Mercedes-Benz released Vision One-Eleven, a pure electric concept car. The biggest significance of this concept car is to show the world a new technology: axial flux motor, which is an important part of the future electrification of Mercedes-Benz. .Recently, Mercedes-Benz released Vision One-Eleven, a pure electric concept car. The biggest significance of this concept car is to show the world a new technology: axial flux motor, which is an important part of the future electrification of Mercedes-Benz.
The axial flux motor used by Mercedes-Benz comes from YASA, a British company specializing in this kind of motor, which Mercedes-Benz will acquire in July 2021.
In fact, in 1821, Faraday invented the world's first disc motor, which was actually an axial flux motor, but was limited by materials and techniques. Instead, the radial flux motor invented later was widely used, that is, At present, the motors used in most electric vehicles are radial flux motors.
For the same amount of permanent magnets and winding material, axial flux motors can provide a 30 percent torque density advantage over traditional radial motors . The YASA motor topology also eliminates the stator yoke, reducing stator mass by up to 80 percent , an innovation that provides a power density advantage of over 30 percent and a range advantage of 5 percent .
Accompanied by high performance is high cost and high difficulty. Therefore, at present, the few application fields of axial flux motors are racing cars and high-performance cars, which require high volume and weight but are not sensitive to cost. For example, when Mercedes-Benz bought YASA, the original intention was to use it on AMG models Implement the application.
Ferrari SF90
SF90 is equipped with three YASA motors, two in front and one behind
Before being acquired by Mercedes-Benz, the most well-known cooperation case of YASA in the past ten years was the Ferrari plug-in hybrid flagship SF90, equipped with three YASA motors, two of which are located on the front axle, and the other is located in the P2 position between the V8 engine and the gearbox. , the P2 scheme of placing the motor between the engine and the gearbox is also the most suitable scheme for YASA motors for a wide range of applications.
"YASA" technology has many advantages, just like this YASA company chooses this as the core technology of high-density motors. "Rome was not built in a day: In fact, YASA technology is the product of technological evolution, and its evolution path can be roughly divided into three stages: the first
wound flat on the teeth. The development of this structure depends on the maturity of the SMC stator bonding process . With the help of the isotropic magnetic permeability of the SMC material, it is possible to get rid of the constraints of the silicon steel sheet stamping process and design the most suitable 3D stator structure The space utilization rate has been greatly improved. The third-generation product, namely the "YASA" structure, completely got rid of the "yoke" and maximized the torque density of the motor. In the same way, the development of this structure must be behind the structure\process The product of technological breakthroughs, the core problem of this process is " how to integrate the split stator teeth into a whole ."
The topology of the YASA motor eliminates the stator yoke, thereby reducing the weight of the stator iron by up to 80 percent , which means that the power density of the YASA motor is 2-3 times that of the non-shaft motor.Compared to conventional electric motors, the YASA axial flux method uses less materials such as copper, iron and permanent magnets, which significantly reduces material costs and provides a more environmentally friendly product.
This is the scene where Vision One-Eleven appeared at the beginning.
