Why has the Xiaomi SU7 been frequently trending on social media? Its groundbreaking HyperEngine V6/V6s and V8s motors have drawn significant attention. Today, let’s take a deep dive into the Xiaomi SU7 motor.
When it comes to electric vehicles, the core technologies are motors, batteries, and electronic control systems—commonly referred to as the “three electrics.”
Among them, the motor is the heart of an electric vehicle, making it the core of the core. The vehicle’s ability to travel far, move fast, and perform dynamically depends entirely on the motor’s capabilities.
So how does Xiaomi’s groundbreaking motor technology break through industry ceilings?
The HyperEngine V6 and V6s motors boast a maximum speed of 21,000 rpm, ranking among the best in the industry. Meanwhile, Xiaomi’s fully self-developed and mass-produced HyperEngine V8s motor reaches an astonishing speed of 27,200 rpm, breaking the speed ceiling in the motor industry.
| HyperEngine V6 | HyperEngine V6s | HyperEngine V8s | |
| RPM | 21,000rpm | 21,000rpm | 27,200rpm |
HyperEngine V6/V6s: Outperforming Tesla Motors
The Xiaomi SU7, released in the 2024 year, is equipped with these two motors. Both the HyperEngine V6 and V6s are permanent magnet synchronous electric motors (PMSM).
What parts do these two motors consist of?
HyperEngine V6 Motor Structure
HyperEngine V6 motor including stator, rotor, bearing, housing, and controller.
HyperEngine V6s motor structure is also, please check the following content.
HyperEngine V6s Motor Structure
But what sets the V6 apart from the V6s?
HyperEngine V6 Motor: Maximum power of 220 kW, peak torque of 400 Nm.
HyperEngine V6s Motor: Maximum power of 275 kW, peak torque of 500 Nm.
The motor power density reaches 6.78 kW/kg. It also surpasses Tesla’s most advanced motor.
How does Xiaomi HyperEngine V6S differ from Tesla Model S Plaid and Porsche Taycan Turbo in terms of speed, torque and power density?
In this table we compare three motors.
| max rpm | peak torque | peak power | power density | |
| HyperEngine V6S | 21000rpm | 500N/m | 275KW | 6.78kw/kg |
| Model S Plaid | 20000rpm | 480N/m | 253kw | 6.22kw/kg |
| Taycan Turbo | 16000rpm | 610N/m | 370KW | 5.29kw/kg |
What challenges does the high speed of HyperEngine V6S pose to the motor rotor?
HyperEngine V6S Motor Technology
Motor Rotor Technology
Leveraging AI simulation, Xiaomi’s engineers evaluated over 200,000 rotor topology configurations.
Xiaomi also collaborated with two motor manufacturers, UMC and Inovance, to optimize the stress at the rotor core magnetic bridge to below the material yield strength limit, achieving a breakthrough in speed without changing the material.
Structural optimization also reduces rotor deformation, and the margin left for deformation between the stator and rotor can be made smaller.
The air gap (the gap between the outer wall of the rotor and the inner wall of the stator) is reduced to an astonishing 1.3mm, bringing stronger electromagnetic performance and less air resistance, further improving efficiency.
Motor Stator Technology
The HyperEngine V6 and V6s motors both use 8-layer hairpin flat-wire winding technology. However, the V6s motor’s stator has a unique design—one side of the flat copper wire winding has a welding point, while the other does not.
What benefits does Hairpin flat wire winding technology bring to motors?
Reduce copper loss: The design of Hairpin flat wire winding with one end welded and the other end not welded reduces the length of the welded end, thereby reducing copper loss.
Improve motor efficiency: Due to the reduced length of the welded end, Hairpin flat wire winding can reduce copper loss, thereby improving the overall efficiency of the motor.
Improve NVH performance: This design can reduce torque pulsation, achieve smoother operation, and contribute to better cooling effect.
After learning about the HyperEngine V6S motor, are you curious about the HyperEngine V8S motor?
HyperEngine V8s: High-Speed Motor
Xiaomi’s self-developed HyperEngine V8s motor achieves a maximum speed of 27,200 rpm, with a peak power of 425 kW, maximum torque of 35 Nm, and an efficiency of 98.11%.
Xiaomi su7 Ultra comes with three electric motors – two Xiaomi V8s and one Xiaomi V6 – generating a combined output of 1,526 horsepower.
What is the structure of such a powerful V8S motor?
V8S Motor Structure
HyperEngine V8s motor including stator, rotor, bearing, housing, and controller.
With such high speed and torque, what technologies does the HyperEngine V8s motor use?
HyperEngine V8S Motor Technology
This motor uses a newly designed cooling system and two-way three-dimensional oil cooling technology.
At the same time, the use of 960MPa high-strength silicon steel successfully increased the heat dissipation efficiency by more than 50% and reduced the maximum temperature by 30%.
V8S Motor Stator Flat Wire Winding Technology
Xiaomi EV Motors redesigned the entire stator and rotor, using a new flat wire winding design, 54 slots and 6 poles for the stator and rotor, with the least pin types in the industry.
It uses 8-layer Hair-Pin flat wire winding technology to improve the pure copper slot fill rate, and also streamlines the winding pin type to 6 types.
The slot fill rate has increased to 77%, the iron loss has decreased by 25%, and the overall motor efficiency has increased by 0.3%. Finally, 27200rpm was achieved, making it the world’s top motor.
You can learn more about V8S motor technology through the “Xiaomi SU7 HyperEngine V8S Motor” connection.
Official data shows that Xiaomi has applied for a total of 155 patents during the development of V8s, of which 60 have been authorized.
This is not the end of Xiaomi Motors. They have innovatively developed “laser rotor winding technology”.
Xiaomi Laser Rotor Winding Technology(35,000 rpm)
Laser winding rotor technology is an advanced manufacturing technology.
It uses the high energy density and precise control ability of laser to tightly wind carbon fiber materials on the rotor. This enables high-precision and high-efficiency manufacturing.
Xiaomi Lab has completed the technical pre-research of 35,000-rpm motors, using a new carbon fiber Aurora winding rotor process.
This technology solidifies the sleeve through laser, avoiding the thermal expansion and contraction problems associated with wet winding.
It brings up to 1000mPa preload and higher manufacturing yield.
More and more EV industry companies are moving enter higher speeds cars.
Huawei: 22,000 rpm motors. Hongqi: M220 modular drive system with motors exceeding 22,000 rpm. GAC Aion: New Quark drive system reaching 25,000 rpm.
Xiaomi Motors has always insisted on investing in core technology research and development. It decided to take speed as the core and ensure leading power density to challenge the ceiling of motor performance.
35,000rpm is far from the ultimate goal. To truly achieve a “fault-leading” speed, you need to go deep into the “no man’s land” of technology!
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