Yuneec motors
- Thread starter Miles
- Start date
liveforphysics
100 TW
I'm in love.
I'm going to try to get a power 20.
75v, 350amps, and built-in sensors, and under 7lbs! Sounds like a dream come true for e-bikes!
I'm going to try to get a power 20.
75v, 350amps, and built-in sensors, and under 7lbs! Sounds like a dream come true for e-bikes!
markcycle
10 kW
I would question what kind of cooling the motor needs. There is a lot of air going through the motor in a aircraft application. Not so for a bike.
They are good looking motors
Mark
They are good looking motors
Mark
etard
100 kW
I don't see where it says 7 lbs. That 20kw motor weighs 20 lbs. Pretty beast motors, can't imagine anything aviation costing less than a grand or two though. I would be interested in a head to head comparo with the Agni 95.
Has anybody put an Agni on an airplane yet?
Has anybody put an Agni on an airplane yet?
liveforphysics
100 TW
Ooops! I was browsing it from my phone, and I mixed up the specs for the controller and the motor. 20lbs motor weight... hmmm.... that's not nearly as attractive at a 20lbs motor weight...
voicecoils
1 MW
I wondered when someone would point that out. Hehe. Outrunner? I'm no RC dude...
Close, Cedric tech inside:
http://www.wired.com/autopia/2008/08/the-company-cla/
etard said:
Close, Cedric tech inside:
http://www.wired.com/autopia/2008/08/the-company-cla/
RoughRider
100 W
- Joined
- May 17, 2009
- Messages
- 208
i guess mark i right...
the cooling will be the show stoper for bikes...
AND
the price...i would think...
the cooling will be the show stoper for bikes...
AND
the price...i would think...
RoughRider
100 W
- Joined
- May 17, 2009
- Messages
- 208
it depends on how much power you wanna have...
you can not get 40kW from a hub with only 17kg of weight...with water cooling you can get it...i think...
my point was: this motors from YUNEEC gets on a aircraft tons of air to cool down...on a bike, you dont have so much airflow...
you will not be able to get the 40kW without killing the motor...
do you have prices for the motors?
you can not get 40kW from a hub with only 17kg of weight...with water cooling you can get it...i think...
my point was: this motors from YUNEEC gets on a aircraft tons of air to cool down...on a bike, you dont have so much airflow...
you will not be able to get the 40kW without killing the motor...
do you have prices for the motors?
Sorry, I don't have any prices.
I understand that there won't be as much airflow, so it will need to be de-rated somewhat, for bike use.
Unless motor speed is a given - as it more or less is, for a hub motor - the relationship between weight and power is open. The relationship between weight and torque, on the other hand, is pretty direct......
Hub motors are just large outrunners and can therefore produce high torque levels. They are not normally vented, though, and although the large mass gives them useful thermal inertia, the heat dissipation path is not much better than on an RC type outrunner. Also, surface area to volume follows an inverse relationship.......
I understand that there won't be as much airflow, so it will need to be de-rated somewhat, for bike use.
Unless motor speed is a given - as it more or less is, for a hub motor - the relationship between weight and power is open. The relationship between weight and torque, on the other hand, is pretty direct......
Hub motors are just large outrunners and can therefore produce high torque levels. They are not normally vented, though, and although the large mass gives them useful thermal inertia, the heat dissipation path is not much better than on an RC type outrunner. Also, surface area to volume follows an inverse relationship.......
TylerDurden
100 GW
Seems like not much difference than cooling an RC motor. Most of the airflow would be from airspeed, not propwash.
At least it has a fan built into the armature.
Might be good for a car conversion.
At least it has a fan built into the armature.
Might be good for a car conversion.
markcycle
10 kW
Miles said:
Are we talking about hub motors I though this thread was about Yuneec motors. Are you attaching me? I simply mentioned a motor designed for aircraft may not get enough cooling on a bike to achieve rated output.
Mark
I was simply responding to:
spinningmagnets
100 TW
Quick story, in WWII, The Germans wanted as many liquid-cooled V-12's as they could make, but the pesky buggers were getting shot down faster than the factory could make them. BMW had a well-designed air-cooled radial already in production so the RLM reluctantly commissioned several planes using that engine.
Normally at top speed the big-round motor was like pushing a barn door through the air. For the FW-190 fighter a snug rounded and smooth fairing was fitted. To get adequate cooling, there was a second small propellor just inside the nose.
Even though the Yuneec motors are set-up for a high volume of passive cooling, air is so fluid that it would not be hard to fit a fan away from the motor and to duct air to it.
Nobody is saying this is a great advance for all EV applications. but having a very small motor that can produce this high an output is a good option for us all, and there must be some applications where a tight fit limits choices (E-motorcycles?). A motor choice that requires an added fan is annoying, but it may be the solution someone can use.
Normally at top speed the big-round motor was like pushing a barn door through the air. For the FW-190 fighter a snug rounded and smooth fairing was fitted. To get adequate cooling, there was a second small propellor just inside the nose.
Even though the Yuneec motors are set-up for a high volume of passive cooling, air is so fluid that it would not be hard to fit a fan away from the motor and to duct air to it.
Nobody is saying this is a great advance for all EV applications. but having a very small motor that can produce this high an output is a good option for us all, and there must be some applications where a tight fit limits choices (E-motorcycles?). A motor choice that requires an added fan is annoying, but it may be the solution someone can use.
liveforphysics
100 TW
That China company sets very fair prices on it's RC stuff. If they don't bother with the headache of getting US FAA testing and aproval, I bet the motors will be pretty reasonable. I would be very suprized if even the 40kw motor was over 2,000usd.
regmeister
100 W
- Joined
- May 9, 2009
- Messages
- 264
deleted
Jeremy Harris
100 MW
The 10kW Yuneec motor is used in a paramotor, where it gets practically no forced air cooling (see here for a picture: http://yuneeccouk.site.securepod.com/paramotor_Tech%20Spec.html). Also, the duty cycle for any engine used on an aircraft os pretty high, much higher than that for land vehicles as a rule, so they need far better cooling. As an example, my aircraft cruises at around 60% power, takes off at 100% and climbs at about 85%. The average continuous power for the flight is always more than 60%, and it's this that dictates the engine cooling requirements.
Now, let's compare that with a land vehicle. I measured the average power of my old Toyota Prius over a two and half year period. It averaged at around 12hp, from an engine rated at 76hp, an average of about 16%. Generally most road vehicles, even fast motorcycles, don't get run at average power levels of over about 20%, so the cooling requirement is a lot less than that for an aero engine.
It'd be nice to know the price of just the motor. The complete paramotor (frame, harness, motor, prop controller and battery) costs around $7000 - $8000, I believe. My guess is that the motor on it's own might be around $1000 to $1500 of that, based on the price of the other parts.
Jeremy
Now, let's compare that with a land vehicle. I measured the average power of my old Toyota Prius over a two and half year period. It averaged at around 12hp, from an engine rated at 76hp, an average of about 16%. Generally most road vehicles, even fast motorcycles, don't get run at average power levels of over about 20%, so the cooling requirement is a lot less than that for an aero engine.
It'd be nice to know the price of just the motor. The complete paramotor (frame, harness, motor, prop controller and battery) costs around $7000 - $8000, I believe. My guess is that the motor on it's own might be around $1000 to $1500 of that, based on the price of the other parts.
Jeremy
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