Have you ever wondered what kind of power system lies behind an electric vehicle that can push the limits at the Nürburgring track and break records? The Xiaomi SU7 Ultra, with an astonishing time of 6 minutes 46.874 seconds, has set the fastest lap time for a four-door car on the track, and behind this achievement is Xiaomi’s self-developed HyperEngine V8s Motor.
Why can this motor support such incredible performance? What unique aspects does it have in terms of power output, torque distribution, and high-speed performance?
Motor Performance
The V8s motor in the Xiaomi SU7 Ultra delivers exceptional performance, with a maximum power of 1548 horsepower and a top speed of 27200 rpm.
This powerful output results in impressive acceleration figures: 0 to 100 km/h in just 1.97 seconds, 0 to 200 km/h in 5.96 seconds, and 0 to 300 km/h in 15.07 seconds. The maximum design speed reaches 350 km/h.
How does Xiaomi’s HyperEngine V8s electric motor maintain high torque stability even at ultra-high speeds? Let’s reveal the internal structure of this motor.
Motor Structure
The casing of the Xiaomi EV motor is made from a patented new type of high-strength aluminum alloy, reducing the weight by 3kg, increasing strength by 27%, improving corrosion resistance by 100%, and enhancing yield strength by 40%, while tensile strength is boosted by 17%.
The motor uses ultra-thin (0.2mm) stator silicon steel sheets combined with ultra-high strength (0.35mm) rotor silicon steel sheets, balancing both strength and efficiency.
Additionally, the motor includes components like the stator oil ring, inverter, and gears.
Why is the Super V8 Motor able to consistently push the limits and break records? What technology does Xiaomi motor use?
Motor Technology and Manufacturing Processes
AI Simulation Technology
At the inception of the design process, Xiaomi’s engineering team employed AI simulation technology. Over eight months and 200,000 iterations of electromagnetic and structural coupling AI simulations, coupled with multiple rounds of sample prototyping, the HyperEngine V8s was born.
Today, AI-driven design has become mainstream among leading automotive manufacturers, facilitating rapid generation of recommended solutions in areas such as body structure and material selection. Xiaomi’s utilization of advanced AI simulation technology underscores its technological prowess in this domain.
How does AI simulation impact motor material selection and optimization? Why choose 960MPa ultra-high-strength silicon steel?
Electric Motor Materials
Xiaomi unveils the industry’s first 960MPa ultra-high-strength special silicon steel sheets, surpassing the industry standard by more than twice (450MPa), enhancing strength.
As motor speeds increase, significant centrifugal forces and stresses are generated within the motor, necessitating reinforcement of the materials used in the rotating components.
Xiaomi once again raises the industry standard by doubling the strength to ensure stability of the rotor at high speeds.
So what technologies are used in the Xiaomi HyperEngine V8 motor rotor? Let’s read on.
Motor Rotor – S-Type 3D Oil Cooling Technology
The HyperEngine V8s achieves an impressive 98.11% motor efficiency. The rotor uses 0.35mm thick silicon steel and is made up of 6 segments.
Xiaomi motor rotor features an S-shaped oil circuit design, where both the rotor shaft and core are cooled simultaneously, with oil entering and exiting at both ends.
This cooling technology lowers the rotor temperature by up to 30°C, reducing risks of deformation and demagnetization caused by rising temperatures, ensuring the motor operates stably at high speeds.
So how does the stator technology that works with it ensure that the overall efficiency is improved?
Motor Stator – Flat Wire Windings + Bidirectional Full Oil Cooling Technology
The stator core of the HyperEngine V8s motor uses 0.2mm thick silicon steel sheets, which are bonded together using a dispensing process to reduce iron loss and improve efficiency.
The stator silicon steel laminations also feature a “staggered” design, increasing the effective heat dissipation area by an additional 7%.
Why does this staggered design improve cooling efficiency?
Advantages of Staggered Silicon Steel Laminations Design
Xiaomi has developed dual-loop 3D oil cooling technology for the stator, which enables the cooling oil to flow bidirectionally inside the stator.
The staggered lamination design increases the contact area with the oil, resulting in more efficient heat conduction.
The stator’s temperature can drop by more than 20°C, with a temperature difference of less than 5°C between both ends.
This design is similar to using a larger fan in summer to cool devices faster.
Flat Wire Winding
The V8s stator features a 54-slot, 6-pole design with 8-layer Hairpin flat wire windings. The stator’s slot fill rate is 77%.
What are the advantages of a high slot fill rate?
A higher slot fill rate means that more coils can fit inside the stator, creating a stronger magnetic field and boosting the motor’s power output.
Compared with Tesla Model 3, Xiaomi’s HyperEngine V8s represents a significant milestone in motor technology, showcasing a blend of innovation and engineering excellence. Core technology is like bricks and stones. Building a solid house requires the accumulation of many bricks and stones.
Xiaomi’s pursuit of the highest speed of the motor is by no means a show of skill, but a solid step forward. Xiaomi’s leading technology in super motors is by no means as simple as the above points.
Customized EV Motor Lamination: Choose Lamnow
Xiaomi’s V8 motor technology breakthroughs undoubtedly demonstrate the future of electric vehicle motor design. As the electric vehicle industry evolves, customized motor cores have become essential.
Lamnow, as a leading motor core lamination manufacturer in China, specializes in the customization of new energy vehicle motor stator and rotor lamination, offering solutions for stamping, laser cutting, wire cutting, and adhesive bonding of motor lamination stacks.
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