Tim Woolmer 3e et +
CTO at YASA Motors
3 h.
Sometimes the only way to achieve the impossible is to target the ridiculous.At
YASA, the challenge we set ourselves was - on paper at least - simple: create the world’s first sports car in-wheel motor with 𝐳𝐞𝐫𝐨 𝐮𝐧𝐬𝐩𝐫𝐮𝐧𝐠-𝐦𝐚𝐬𝐬 𝐚𝐝𝐝𝐢𝐭𝐢𝐨𝐧. Our customers loved the idea, but the brief was absolute: don’t add a single gram to the wheel.🏋

To make that happen, we needed two big mindset shifts:1) Rear motors had to handle not only traction but the full force of braking – around 𝟲𝟱𝟬𝗸𝗪 𝗽𝗲𝗿 𝗿𝗲𝗮𝗿 𝘄𝗵𝗲𝗲𝗹 in a high-performance sports EV.2) Carbon-ceramic discs are incredibly light. At just 𝟭𝟯.𝟵𝗸𝗴 𝗮𝗻𝗱 𝟰𝟳𝗸𝗪/𝗸𝗴, the motor had to surpass the state-of-the-art (~23kW/kg at project start) to get close to mass neutrality.Two years later, I’m excited to introduce YASA's in-wheel concept!

𝗔 𝗽𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗲 𝗺𝗮𝘀𝘀-𝗻𝗲𝘂𝘁𝗿𝗮𝗹** 𝗶𝗻-𝘄𝗵𝗲𝗲𝗹 𝗺𝗼𝘁𝗼𝗿 that combines our 59kW/kg motor, upright, wheel bearing, and transmission into a 750kW (1000hp), 4,000Nm magnetic beast

.𝗧𝗵𝗲 𝗶𝗺𝗽𝗮𝗰𝘁: over 200kg of hardware removed (rear EDU, driveshafts, CVs, cradle, and even the carbon-ceramic brakes). And if you design the EV around it - taking advantage of mass de-compounding, a smaller battery, and higher regen capability - that 200 kg saving can more than double.


It’s still early days, and the system remains very much in the testing and development phase, but it shows how in-wheel architectures could redefine what an electric sports car can be: 𝗹𝗶𝗴𝗵𝘁𝗲𝗿, 𝗳𝗮𝘀𝘁𝗲𝗿 𝗮𝗻𝗱 𝗺𝗼𝗿𝗲 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁. Interested to hear what you think - add your questions or comments below.
#AxialFlux #InWheelMotor #EVPerformance #ElectricDrive #PowerDensity #DeepTech #EVEngineering #Prototype**Mass neutrality assumes 13.9kg brake removed, ½ a driveshaft (4kg), 12.7kg motor & 5.5kg transmission added. Wheel bearing & upright & rim all optimised for application. A lightweight emergency brake available within the package if functional safety requires it.