Go for it. 
Powered velomobile
- Thread starter heliolatrix
- Start date
cal3thousand
10 MW
amberwolf said:Go for it.
I'm unsure of the best section.
crossbreak
1 MW
cal3thousand said:amberwolf said:Go for it.
I'm unsure of the best section.
I'd simply add it to the motor tech page. The whole structure of the wiki needs some reorganisation.
heliolatrix
10 W
I am looking for some kind of belt that will take the torque of an electric motor, but that will drive a 19” rim from a 24” wheel this will attach to a 26” wheel. There will be a belt in the rim facing out and the drive belt facing in.
I think the belt will need to be about 89 inches or most likely even longer. Do timing belts get that long?
I saw a low profile notched V belt with large notches ( don't know the name) that was only about half inch wide but I do not know the name of it.
Has anyone seen photos of such a drive?
I think the belt will need to be about 89 inches or most likely even longer. Do timing belts get that long?
I saw a low profile notched V belt with large notches ( don't know the name) that was only about half inch wide but I do not know the name of it.
Has anyone seen photos of such a drive?
heliolatrix
10 W
the one I saw did work but not perfectly, it was using some kind of thin notched v belt. so the timing belts dont work? maybe I should try bending one to see if it changes vector too much.
Do they all have the same notch spacing?
Do they all have the same notch spacing?
V-belts are sometimes notched to improve efficiency and grip. I'm not sure how that would apply to this case?
Re. timing belts, there are different tooth profiles for different priorities. Pitches relevant to us are 5mm and 8mm.
Re. timing belts, there are different tooth profiles for different priorities. Pitches relevant to us are 5mm and 8mm.
heliolatrix
10 W
I need a book about programming controllers, please point me to one? ( AC and DC all kinds)
bigmoose
1 MW
If I get the gist of your request, you likely want to develop your own controller?
The best place to start is the microprocessor/DSP manufacturer (TI, Microchip, Cygnal, Siemens, etc), who's IC you want to use. Start looking for Application Notes, Design Notes, Demo Boards etc. on the motor of your choice. Likely 3 phase brushless DC. Most everything you need is in those data sheets.
If you want to program existing eBike controllers, then this thread is for you: http://endless-sphere.com/forums/viewtopic.php?f=2&t=27927
The best place to start is the microprocessor/DSP manufacturer (TI, Microchip, Cygnal, Siemens, etc), who's IC you want to use. Start looking for Application Notes, Design Notes, Demo Boards etc. on the motor of your choice. Likely 3 phase brushless DC. Most everything you need is in those data sheets.
If you want to program existing eBike controllers, then this thread is for you: http://endless-sphere.com/forums/viewtopic.php?f=2&t=27927
heliolatrix
10 W
first stage
second stage
this is a one stage reduction
second stage
this is a one stage reduction
heliolatrix
10 W
I need a book about how to program controllers because I want to learn what is possible and what they can do.
I need a book because I do not own a computer or internet links. I can not stay on the computers all day to read anything.
Are there NO books about the subject? I am thinking about all EV's nto just ebikes.
I need a book because I do not own a computer or internet links. I can not stay on the computers all day to read anything.
Are there NO books about the subject? I am thinking about all EV's nto just ebikes.
spinningmagnets
100 TW
Kingfish
100 MW
^ +1 what BigMoose said. AFAIK there are no books specific to ebike or ev controllers per se. However there is plenty out there on microcontrollers and their applications. Most, though not all require C++ or Assembly Language knowledge. Some come with free/low cost compliers but though yer stuck with proprietary libraries/compilers.
Begin your search here...
Good hunting, KF
Begin your search here...
Good hunting, KF
flyinmonkie
10 kW
http://endless-sphere.com/forums/viewtopic.php?f=28&t=19841
Just to add my take
Clay
Just to add my take
Clay
heliolatrix
10 W
where can I get these gearing parts, bearings, and maybe a premade mounting plate?
spinningmagnets
100 TW
Find a system that appeals to you, and we can supply the links. The companies that make every possible part for every possible variation of a two-stage drive would be a very long list. There are parts links in the stories that I linked to
If you want advice on what type of system you should seriously considering, in order to narrow down the list, you must post what type of application you intend. Will this be for offroad or street (or both)? What type of speeds do you hope to achieve? What type of budget can you use for this project? do you already have a bike? If you will buy a bike for this project, what type of bike appeals to you (because the type of frame may limit the options)...
If you want advice on what type of system you should seriously considering, in order to narrow down the list, you must post what type of application you intend. Will this be for offroad or street (or both)? What type of speeds do you hope to achieve? What type of budget can you use for this project? do you already have a bike? If you will buy a bike for this project, what type of bike appeals to you (because the type of frame may limit the options)...
You will want to make your own plates with a drill, angle grinder, steel etc.
good places to shop are:
http://www.robotmarketplace.com/store.html
http://staton-inc.com/home.shtml
http://www.usabearingsandbelts.com/
good places to shop are:
http://www.robotmarketplace.com/store.html
http://staton-inc.com/home.shtml
http://www.usabearingsandbelts.com/
heliolatrix
10 W
The first thing I need to find is ratcheting sprocket (with reverse threads or key way to hold it on the shaft) for the first part of the second stage And possibly a shaft already machined for it; is there one that will hold a bicycle sproket?? Then knowing what sizes of shaft I have to work with I will find a timing wheel large as possible, and belt that will work for the first stage reduction.
I have not done any calculations yet, I am not good with math.
And finally a sprocket to attach to rear wheel. This should be a reasonably strong chain. I am not sure what kind of motor my friend has, but he does not have much money. He has lost the use of his hands and not much power in his legs. So I want to build this for torque not speed.
I am thinking about 12 to 15mph....a speed he can pedal at to get exercise. The hills are not kind in this area some are really bad. I think he has a 20 tire wheel on the trike.
I really liked some of the photos, but can't copy some of them.
I have not done any calculations yet, I am not good with math.
And finally a sprocket to attach to rear wheel. This should be a reasonably strong chain. I am not sure what kind of motor my friend has, but he does not have much money. He has lost the use of his hands and not much power in his legs. So I want to build this for torque not speed.
I am thinking about 12 to 15mph....a speed he can pedal at to get exercise. The hills are not kind in this area some are really bad. I think he has a 20 tire wheel on the trike.
I really liked some of the photos, but can't copy some of them.
bobc
10 kW
what I'm putting on my trike -
wheel sprocket is on freewheel LH threaded onto hub disc mount
and a closeup of the 2 stage reduction bit. BTW I've lost faith with roller chain for the first (high speed) stage since my first one threw out all its lubrication....
might give you some ideas ;^)
All the custom parts are laser cut stainless 3mm thick. Except for the 12mm jackshaft. That includes the wheel sprocket.
wheel sprocket is on freewheel LH threaded onto hub disc mount
and a closeup of the 2 stage reduction bit. BTW I've lost faith with roller chain for the first (high speed) stage since my first one threw out all its lubrication....
might give you some ideas ;^)
All the custom parts are laser cut stainless 3mm thick. Except for the 12mm jackshaft. That includes the wheel sprocket.
heliolatrix
10 W
I was trying to calculate the wheel speed in high gear and slow crank speed. But I may have gotten it wrong somehow.
52 sprockets / 12 sprockets on the rear= 4.333 ratio? X 60rpm crank speed x (20” x pi=62.8inch circumference) = 16327.987 inch min. / 12 inch = 1360.6655 and then 5280/1360.6655 = only 3.88 mph???
If that is correct I will have to drive the crank which will make it a three stage reduction. And take more power to begin with because I can’t possibly gear the motor down to 60 rpm.
Is that correct???
I still do not know what kind of motor he has….must find out soon.
bandaro
10 kW
you can use the sheldon brown calculator for gearing speeds:
http://sheldonbrown.com/gears/index.html
http://sheldonbrown.com/gears/index.html
heliolatrix
10 W
that calculator does not work.
this reads like a calculator input
52 sprockets / 12 sprockets on the rear= 4.333 ratio? X 60rpm crank speed x (20” x pi=62.8inch circumference) = 16327.987 inch min. / 12 inch = 1360.6655ft/min. x 5280ft x 60min/hr= 15.45 mi/hr
this reads like a calculator input
52 sprockets / 12 sprockets on the rear= 4.333 ratio? X 60rpm crank speed x (20” x pi=62.8inch circumference) = 16327.987 inch min. / 12 inch = 1360.6655ft/min. x 5280ft x 60min/hr= 15.45 mi/hr
Similar threads
