Still cool if the gearbox can be omitted in car applications.
Do EV's have gearboxes?
Porsche Taycan has a two-speed gearbox, probably developed by or with Rimac.
Hunstable Electric Turbine can produce up to 3x the torque of other motors
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Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#12The motors are not really taking up a lot of useful space in the car and are not underpowered by any stretch so this tech needs to be price competitive. Like Hyundai said batteries are where we need to see advances. Don't get me wrong it is interesting and I am glad to see advances but I don't see this as a terribly useful advance today.
I see it as a BIG advance for small drones. The same torque from smaller engine where every gram counts is a big win, you can replace that weight with more battery.
What counts there is power density, not torque density, isn't it? Quadcopters don't typically gear their motors down, instead preferring to pitch the rotors at shallow angles of attack.
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#13The key quote from the linked article seems to be "It’s essentially two concentric radial motors bookended by two axial ones."
My question is where's the cooling? You can put more magnetic field and torque into an ever smaller area, always true, but still going to have to dump heat out via some path. And the bigger the path for whatever is cooling, the lower the magnetic flux density and torque. So I'd be interested in hearing how the cooling system works. Its not like their copper is more conductive than everyone elses copper, LOL.
yetihehe suggests drone use, plenty of air movement there.
Some of the quotes in the article sound very aerospace. Everyone is dancing around the concept without saying it, that the main advantage of removing or downsizing the gear train is along the lines of aerospace style "simplicate and add lightness" which is often much more expensive than it sounds. For example, imagine an electric general aviation airplane, you can't have problems man-rating the electric gearbox if your electric Cessna-172 doesn't even HAVE a gearbox between the electric motor and prop. Likewise for EVs, complete elimination of the gearbox would seem to eliminate all gearbox related maintenance and repairs. Honestly, the car manufacturers might not be amused at the concept of selling fewer more reliable cars. (Edited to add, also see car racing entertainment, if you enter an EV in a popular automobile race, you can't drop out of the race due to gearbox failure if you have no gearbox to fail... is that good or bad for ratings?)
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#14Still cool if the gearbox can be omitted in car applications.
Do EV's have gearboxes?
Some do, some don't.
The Koenigsegg hybrid (so not strictly an EV, but can be operated as a pure EV) famously don't have a gearbox but a single, fixed reduction gear. There is a hydraulic coupling for the electrical motors to allow slow speeds. At higher speeds the coupling is mechanically locked to directly connect all engines to the wheels.
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#15Earlier quoted context omitted.
I see it as a BIG advance for small drones. The same torque from smaller engine where every gram counts is a big win, you can replace that weight with more battery.
What counts there is power density, not torque density, isn't it? Quadcopters don't typically gear their motors down, instead preferring to pitch the rotors at shallow angles of attack.
So, better for racing drones, they will be able to change speed of propellers faster, they already use higher angles to readuce propeller speed (gyroscopic effects are killing maneuvring). Shallow angles are better for efficiency.
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#16The motors are not really taking up a lot of useful space in the car and are not underpowered by any stretch so this tech needs to be price competitive. Like Hyundai said batteries are where we need to see advances. Don't get me wrong it is interesting and I am glad to see advances but I don't see this as a terribly useful advance today.
Getting rid of a gearbox that weighs 70kg seems like a significant weight saving. They also claim more efficiency which could result in smaller batteries or more range.
Well got to admit, the standard exaggerated imagery implies large battery savings where we really do not know how much it could imply and I bet it would be a big stretch to hit double digits.
They may save on reduction gearing but recently Porsche went the other way by adding in a two speed transmission so as to improve high speed efficiency. Electrics would tend towards requiring heavier duty transmissions common to diesels simply because of torque but a good application of multiple gears in a transmission could benefit EVs depending again, on application. We would need to see the amount of electricity being consumed at different load levels and compare the cost of a transmission to increased batteries as to which is best for it.
Personally, the less parts the better.
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#17Haven’t I heard robotics needs more powerful motors to be viable? At least for household uses.
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#18Haven’t I heard robotics needs more powerful motors to be viable? At least for household uses.
Larger power density also means less weight for the same power.
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#19The motors are not really taking up a lot of useful space in the car and are not underpowered by any stretch so this tech needs to be price competitive. Like Hyundai said batteries are where we need to see advances. Don't get me wrong it is interesting and I am glad to see advances but I don't see this as a terribly useful advance today.
Possibly useful for hybrids where you're trying to squeeze an electric motor in next to an existing ICE?
Re: Hunstable Electric Turbine can produce up to 3x the torque of other motors
#20Earlier quoted context omitted.
Getting rid of a gearbox that weighs 70kg seems like a significant weight saving. They also claim more efficiency which could result in smaller batteries or more range.
Well got to admit, the standard exaggerated imagery implies large battery savings where we really do not know how much it could imply and I bet it would be a big stretch to hit double digits. They may save on reduction gearing but recently Porsche went the other way by adding in a two speed transmission so as to improve high speed efficiency. Electrics would tend towards requiring heavier duty transmissions common to…
In practice, "battery savings" will translate to "we'll do more with the same battery life"; see also: smartphones who have gotten 1000x as fast over the past decade (or whatever) and still only manage a day of intense use on a battery.