Get a hub motor
- Thread starter EbikeMaui
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EbikeMaui
1 kW
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There is no reason to use any more than 1200 watts or to go faster than 30 mph even though I can with a 5 lb motor.eP said:So you are ready to racing with turtles RandyEbikeMaui said:
Stop this shit!! Randy.
What is the efficiency at 0.2 HP ?
http://video.google.com/videoplay?docid=40059310945424798&q=ecyclemaui
Stevil_Knevil
10 kW
Bubye, Ranty.
CGameProgrammer
10 kW
0.2 HP is 149 watts.EbikeMaui said:
Hi all
I use a external motor myself (USPD modified) I can see the situation from the outside looking in Randy can't or does not want to give an answer to your question as he knows at 0.2 hp his motor is not as efficient from what I have read the large motor he is using can't be, the only way to increase the efficiency at low wattages is to increase the reduction ratio between motor RPM and wheel RPM, this would reduce top/peak speed and from what I have read Randy likes to be a speed demon.
As I said I may not use a hub motor but Randy seems to have taken external motors to a unbelieveable degree with a 4to5 hp motor originaly designed for a boat. Hub may be better than external or not, but Randys motor seem to be overkill, his choice of motor should be on a E-scooter/moped not an E-bike.
thats all for now
Geoff
I use a external motor myself (USPD modified) I can see the situation from the outside looking in Randy can't or does not want to give an answer to your question as he knows at 0.2 hp his motor is not as efficient from what I have read the large motor he is using can't be, the only way to increase the efficiency at low wattages is to increase the reduction ratio between motor RPM and wheel RPM, this would reduce top/peak speed and from what I have read Randy likes to be a speed demon.
As I said I may not use a hub motor but Randy seems to have taken external motors to a unbelieveable degree with a 4to5 hp motor originaly designed for a boat
. Hub may be better than external or not, but Randys motor seem to be overkill, his choice of motor should be on a E-scooter/moped not an E-bike.thats all for now
Geoff
geoff57 said:
Hi
It is true. Even efficient and powerful brushless Etek has own weak side. It is not optimized to run at high efficiency at high rpm and low load.
So if eteks rider want high efficiency at relatively high speed and low load (at flat or even low grade downhill) he need a extremly wide span gears if he care comfortable climibing also.
The better solution could be a coreless brushless motor which have extremly high efficiency at very wide rpms span.
Randy is a troll - he don't learn anything, especially he dont talk his motors weak sides.
And he has wide lack understanding elementary scholarship - his famous max. efficiency at stall point.
As a troll he don't need a scholarship, so we dont need care about what (false statement/conclusion/proposal) he try to fabricate.
hi eP
the other solution is to fit a multispeed gearbox much like a car so that the motor is able to run at the most efficient RPM but a wide range of speeds, this is only possable with an external motor.
Before somone says dual speed Crystalyte I know and this is a good hub motor, for many people this is the most versatile simple option to go down the route of a gearbox for somone who just wants to jump on and go there is no option, a hub motor is the best option.
My wife and a friend of mine both of which could not even change a tyre have hub motor ebikes maybe not the most efficient but very low maintenance for them they are ideal.
My setup is under constant tweeking but for me that is fine, but most of us want as I said a jump and go ebike and all of the hub motor systems give that once they have been setup. The USPD and all of the other external systems need an eye keeping on the chain drive.
thats all for now
Geoff
the other solution is to fit a multispeed gearbox much like a car so that the motor is able to run at the most efficient RPM but a wide range of speeds, this is only possable with an external motor.
Before somone says dual speed Crystalyte I know and this is a good hub motor, for many people this is the most versatile simple option to go down the route of a gearbox for somone who just wants to jump on and go there is no option, a hub motor is the best option.
My wife and a friend of mine both of which could not even change a tyre have hub motor ebikes maybe not the most efficient but very low maintenance for them they are ideal.
My setup is under constant tweeking but for me that is fine, but most of us want as I said a jump and go ebike and all of the hub motor systems give that once they have been setup. The USPD and all of the other external systems need an eye keeping on the chain drive.
thats all for now
Geoff
CGameProgrammer
10 kW
Ah, those happy faces sure make me feel relaxed and content. What a nice guy Randy is! 
eP said:
Hi all
Since increasing the voltage on my setup I can see that at higher wattages starting from still is a lot easer I still say it must be inefficient at low speeds and high wattages as my best bet on efficiency is watts to speed and Who wants to travel at 120meters an hour(1rpm on a 26inch wheel) .
Any of us with a watt meter (eg drainbrain) have seen at start off the wattage peaks and then as speed increases the watts go down to a crusing speed, this is the point at which efficency should be mesured.
I think I will start up a thread on this after I have done some more tests to back up my statements,to start my cycle cruses at approx 25 mph with a wattage of 850, so watts divided by mph gives an answer of 34 the higher the number the less efficient it is. this is a thing that needs a thread of its own maybe :?
As far as a hub motor over a external motor,there is no sure answer to that debate but for simplisity and ease a hub can't be bettered,and I use an external motor!
EbikeMaui
1 kW
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The design of the hub motor to provide a low end efficiency CAN be improved.A external mounted motor can be just as easy to mount and it can be totaly protected without adding unneeded heavy unsuspended weight on the axil. There is still plenty of room for debate and ebike system improvment. The thing is that not many people are making any improvments on ebikes and just settle for a pop on hub motor as bad as they are because ther are cheap.geoff57 said:
Hi allEbikeMaui said:
to the rest of you I think he must be smelling the fumes from those famous volcanos hekeeps on going in about going up on his ebike.
how can fitting an external motor and chaindrive be as simple as swoping over one wheel for another, as I have said on counless times I ride a external motor and am happy with it but I like to tinker and most of the people on this forum do as well,we in a way are the R and D for the industry.
once a motor has been made of a size it will fit in a wheel various gear ratios and voltages are tried the ones they like then go out for public feedback the results are the multitude of hub motors avalible they each have a target market be it speed or hill climing, no electric motor in fact no motor of any fuel type can be said to be master of all if somone thinks there is such a motor they are fooling themselves.
thats all for now
Geoff
TylerDurden
100 GW
EbikeMaui said:
A tutorial on the process would be great.
EbikeMaui said:Why bother? Girl scout hub motors are unbeatable according to the majority of the forum members.TylerDurden said:EbikeMaui said:
A tutorial on the process would be great.
Hi all
thats why the hub motor axels are stronger than normal axels so your point on weight is wrong in fact the reverse at least the axel of a hub motor is designed for the weight a normal axel isn't unless you get an axel for heavyweights
Hub motor is just a name for the place where the motor is put. Take the motor out of the hub attach it to the frame add a chain drive with the same reduction ratio as the hub motor originaly used and you have what you've always wanted randy but if you think that it will catch on you are out of your mind.
customers want ease of use and low mantainence and thats what the hub motor gives them.
randy an idea for you take your motor and build a shell around it with whatever reduction you use on your Ebike then make a frame to fit the new "state of the art" ebikemaui approved hub motor and see what happens, you might be on to a winner, a hub motor that no longer goes to girl scouts
TylerDurden
100 GW
For the same reason a video of a bike test is good...EbikeMaui said:
We all enjoy learning and it keeps everybody honest.
ie:
"My bike is better... see the video? If your bike is better, make the video."
"My motor is easier to install... see the video? If your motor is easier, make the video."
Or, as a wise man on volcano once said: "PROVE IT."
8)
ACCOUNTABILITY and TRANSPARENCY RULES!!!!!!!!!
CGameProgrammer
10 kW
Randy doesn't want that; nobody does. A gearless hub motor must rotate at the same speed as the wheel, which is not really very fast at all, and that puts certain limitations on the motor. A motor connected by a chain can spin very quickly due to the gear ratio. There'd be no reason to restrict the external motor to a 1:1 ratio with wheel speed as you suggest, except possibly to keep it quiet, but the chain will probably be making noise anyway. And a slowly-rotating motor would have to be large (if it is to be powerful, that is) which would make it harder to mount in a bicycle.geoff57 said:
xyster
10 MW
Stokemonkey employs a hubmotor fixed to the frame, with a gear on the axle.
http://cleverchimp.com/products/stokemonkey/
http://cleverchimp.com/products/stokemonkey/
I agree with EbikeMouthy on the point that it doesn't make a whole lotta sense to reduce a motors rpm to crank speed just to step it up again to the wheel. Unless someone can explain to me that the loss is negligeble & there's some other benefit to this tradeoff. Once it's determined to go with a chain & cogs anyway, may as well take as direct a path to the wheel as possible.
The Stokemonkey setup allows the motor to go through the gears on the bike. You can gear down on hills, which should more than make up for the efficiency lost in the extra chain, unless you live in Kansas.
If you look at the Puma hub motor, it's really no different than Randy's setup other than the motor is in a hub. It still has gear reduction between the motor and wheel and it has a very efficient brushless motor.
If you look at the Puma hub motor, it's really no different than Randy's setup other than the motor is in a hub. It still has gear reduction between the motor and wheel and it has a very efficient brushless motor.
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