UK-based YASA has just built a tiny electric motor that makes Tesla motors look like slackers, and this invention could potentially reshape the future of EVs
This looks small enough to be installed within the wheel hub itself. Imagine a car with four motors, one inside each wheel. The entire floor pan could just be one thin battery, and everything above it could be passenger and storage space.
And some 2000s EVs tried it. But it’s impractical.
It increases unsprung weight, e.g. weight not cushioned by suspension. Bad for ride/handling/steering feel.
All that vibration is HARD on the motor. Read: unreliable.
Motor is more exposed to temperature/dust. Again, reliability.
In reality, a decent suspension needs a lot of room under the body anyway. An axle to get the motor in the body is dirt cheap on the rear, and still pretty cheap on the front, and you could just mount this thing sideways to make it flat…
Handling and ride quality are dramatically and negatively impacted by every bit of weight that is not held up by the suspension. That’s why higher performance cars will have lightweight wheels. Rather than steel wheels you see on lower performance cars.
It’s better to just put all the heavy drive components inboard on the chassis and run drive shafts to the wheels.
You see motors in the hubs of bicycles, because they really don’t go that fast. So even if the bike has a suspension, it’s not that big of a deal. Motorcycles on the other hand would need to keep any heavy parts inboard.
If you have different information about a production car, please share it. The theoretical concept ID.2 R may use hub motors but that is vaporware at this point.
I only have german articles. I only heard it in the video source below, and they sadly don’t really say how the normal problems with hub motors would be solved even though they have a section for it in the video.
They make sense for scooters, bikes, and other low speed or two wheel personal transport. For anything with an actual suspension (designed for a highway) there is just too much competition for space with brakes and suspension linkage. The unsprung weight, exposed high voltage cabling subject to road debris and accidents are problems too. And what to do hub motors really gain you?
Simplicity, no transmission. As to unsprung weight, designs like these have a ridiculous power density, so add only very little. Advanced suspensions are active anyway, so just part of the wheel robot.
Except for the fact that that much power would need massive batteries. So your thin small battery would be dead the first time you mashed the peddle to the floor
This looks small enough to be installed within the wheel hub itself. Imagine a car with four motors, one inside each wheel. The entire floor pan could just be one thin battery, and everything above it could be passenger and storage space.
That’s how EVs started! Sorta.
This is from a Porsche in 1900:
And some 2000s EVs tried it. But it’s impractical.
It increases unsprung weight, e.g. weight not cushioned by suspension. Bad for ride/handling/steering feel.
All that vibration is HARD on the motor. Read: unreliable.
Motor is more exposed to temperature/dust. Again, reliability.
In reality, a decent suspension needs a lot of room under the body anyway. An axle to get the motor in the body is dirt cheap on the rear, and still pretty cheap on the front, and you could just mount this thing sideways to make it flat…
That would be a lot of unsprung weight.
Handling and ride quality are dramatically and negatively impacted by every bit of weight that is not held up by the suspension. That’s why higher performance cars will have lightweight wheels. Rather than steel wheels you see on lower performance cars.
It’s better to just put all the heavy drive components inboard on the chassis and run drive shafts to the wheels.
You see motors in the hubs of bicycles, because they really don’t go that fast. So even if the bike has a suspension, it’s not that big of a deal. Motorcycles on the other hand would need to keep any heavy parts inboard.
Aptera wanted to do this with their flagship Solar Electric Vehicle (SEV).
IIRC, they switched to an outwheel motor because of the weight the inwheel motors added to the wheels. Could be wrong tho
Hub motors are a party trick. They will never reach mass market in a car.
They work well on bikes. I could appreciate 1000bhp hub on my 12kg touring bike. 🤭
I agree, they are good for minimally suspended low speed personal transport.
German company DeepDrive has some kinda promising tech. And the ID.Polo seems to be said to have hub motors.
Not even the concept had hub motors.
https://www.autoexpress.co.uk/news/volkswagen-id-polo
https://electricarworld.com/volkswagen-polo-makes-a-comeback-as-an-electric-car/
https://auto.hindustantimes.com/auto/electric-vehicles/volkswagen-id-polo-gti-breaks-cover-at-iaa-mobility-comes-as-reborn-polo-gti-41757316409552.html
Limited slip differential? Can’t do that with hub motors. https://www.topgear.com.ph/news/car-news/volkswagen-id-polo-prototype-a5100-20250908
If you have different information about a production car, please share it. The theoretical concept ID.2 R may use hub motors but that is vaporware at this point.
I only have german articles. I only heard it in the video source below, and they sadly don’t really say how the normal problems with hub motors would be solved even though they have a section for it in the video.
https://www.electrive.net/2025/06/20/vw-soll-neues-topmodell-id-2-r-mit-radnabenmotoren-erwaegen/
https://youtu.be/R3Sok4ZbUyo
Renault 5 RS Turbo has hub motors, Nostradamus.
That car is the definition of a party trick. You proved my point, so thank you.
That’s because its a limited run show car. Its not meant to be practical.
Imagine on a motorcycle… Probably nonstop wheely 🤣
uni-motorcycle
They make sense for scooters, bikes, and other low speed or two wheel personal transport. For anything with an actual suspension (designed for a highway) there is just too much competition for space with brakes and suspension linkage. The unsprung weight, exposed high voltage cabling subject to road debris and accidents are problems too. And what to do hub motors really gain you?
Less weight, less parts, 4WD, 4W traction control, more cabin space because no driveshafts.
Simplicity, no transmission. As to unsprung weight, designs like these have a ridiculous power density, so add only very little. Advanced suspensions are active anyway, so just part of the wheel robot.
This is already pretty close to how many EVs are designed.
Except for the fact that that much power would need massive batteries. So your thin small battery would be dead the first time you mashed the peddle to the floor
forgot the part where they were excited to put the batteries on the tire