Search found 143 matches

by Fumesucker
Dec 15 2008 6:21am
Forum: E-Bike Non-hub Motor Drives
Topic: most effiecient motor
Replies: 10
Views: 1614

Re: most effiecient motor

Since you listed inexpensive as one of your criteria perhaps this motor might work for you.

http://www.hobbycity.com/hobbycity/stor ... Kv_/_3250W
by Fumesucker
Nov 22 2008 7:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: My non hub build
Replies: 46
Views: 8071

Re: My non hub build

An analog ammeter isn't going to care about voltage, all it cares about is how many electrons are going through the shunt in a given length of time.
by Fumesucker
Nov 21 2008 7:36am
Forum: E-Bike Non-hub Motor Drives
Topic: Mounting Gearbox & Motor Aluminum Frame - Weld? Bond?
Replies: 28
Views: 4988

Re: Mounting Gearbox & Motor Aluminum Frame - Weld? Bond?

To me it would depend on the bike I'm putting the drive on.. If you feel it's your ultimate bike, the one you plan on keeping for a good while, go ahead and have it welded, that can be made to look the nicest with the least effort. A bike worth trading later, do some kind of semi permanent thing wit...
by Fumesucker
Nov 19 2008 11:16pm
Forum: E-Bike Non-hub Motor Drives
Topic: Motor testing without a dyno.. or even a tach..
Replies: 9
Views: 2073

Re: Motor testing without a dyno.. or even a tach..

John,

Keep in mind that the waveform is very harmonic rich, in fact when I looked at it with SpectrumLab the first harmonic is actually several dB louder than the fundamental frequency..

Which means you should start with a low frequency and sweep up until you get a beat with the prop sound.
by Fumesucker
Nov 17 2008 5:30pm
Forum: E-Bike Technical
Topic: Energy density for SLA, Li and Gasoline
Replies: 11
Views: 1272

Re: Energy density for SLA, Li and Gasoline

The motor and drive train in an EV weigh less and are more compact than an equivalent ICE, this leaves more weight proportionally for batteries in the vehicle than fuel in the ICE.

Not sure how much effect his has, but it wouldn't surprise me to see it add another 20% or so range.
by Fumesucker
Nov 17 2008 12:35pm
Forum: E-Bike Non-hub Motor Drives
Topic: Tostino's Custom BMC build
Replies: 16
Views: 3142

Re: Tostino's Custom BMC build

Nice shade-tree build.. Ingenious..

How's your hill climbing ability?

What gears did you end up using under power?
by Fumesucker
Nov 17 2008 1:00am
Forum: E-Bike Non-hub Motor Drives
Topic: Mongoose DX project
Replies: 208
Views: 27835

Re: Mongoose DX project

My avatar is my project, a BikeE recumbent. I'm doing a power unit to pull the bottom chain run and then a freewheel on the crank so I can use all my gears (my bike has a seven speed derailleur and a three speed hub, all the gears are in the rear). I'm probably going to send the 10T back, I've found...
by Fumesucker
Nov 16 2008 9:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: Motor testing without a dyno.. or even a tach..
Replies: 9
Views: 2073

Re: Motor testing without a dyno.. or even a tach..

Now that *is* a good idea.. I definitely like that. My cell takes voice notes, that would be more than adequate to record the audio from the spokes.. If you were to use a digital video cam you could vid the wattmeter at the same time and get some really comprehensive numbers.. Speed, acceleration, v...
by Fumesucker
Nov 16 2008 9:48am
Forum: E-Bike General Discussion
Topic: Demographics?
Replies: 156
Views: 15966

Re: Demographics?

Fifty eight, married, one kid, three grandkids. I'm basically a professional JOAT (jack of all trades) but my primary expertise is troubleshooting and repairing high powered electromechanical equipment, mostly stuff that the manufacturer has gone out of business and for which parts are not available...
by Fumesucker
Nov 16 2008 9:24am
Forum: E-Bike General Discussion
Topic: .
Replies: 26
Views: 2559

Re: Big Hank Tire almost goes Boom!

Well I just got back from the dumb bike store. Those damn tires are now $30. They use to be $20. Thats a 50% increase. What in the hell is going on!!! More like wtf! Bastards. Thats fine raise your prices on everything. You'll just sell less and go out of business. Bastards!!! I only bought one. (o...
by Fumesucker
Nov 16 2008 9:18am
Forum: E-Bike Non-hub Motor Drives
Topic: Mongoose DX project
Replies: 208
Views: 27835

Re: Mongoose DX project

I just got one of those TowerPro 10t motors and measured the constants..

Kv = 220

Io = 1.33A

Rm= .068 ohm

The Io seems to vary quite a bit, I'm thinking the bearings might be dragging intermittently. The value I gave is the lowest one I recorded.
by Fumesucker
Nov 16 2008 9:11am
Forum: E-Bike Non-hub Motor Drives
Topic: Motor testing without a dyno.. or even a tach..
Replies: 9
Views: 2073

Re: Motor testing without a dyno.. or even a tach..

I hadn't thought of that, TD, you just need to make sure that the sound you are using to measure rpm is the loudest one by a fair bit. It also helps if the sound is the lowest frequency among the sounds the mic picks up. Milk jug material works pretty well for shade tree guitar picks, I don't see wh...
by Fumesucker
Nov 16 2008 8:31am
Forum: E-Bike Non-hub Motor Drives
Topic: Motor testing without a dyno.. or even a tach..
Replies: 9
Views: 2073

Motor testing without a dyno.. or even a tach..

So.. I got my brushless motor the other day and wanted to confirm the rather vague motor constants provided by the seller. The way I go about motor testing is to use two different propellers on the motor, measure the voltage, current and rpm with each propeller at full throttle as well as a no load ...
by Fumesucker
Nov 04 2008 10:48pm
Forum: E-Bike Non-hub Motor Drives
Topic: Using RC motors on E-bikes [Archive]
Replies: 1244
Views: 154421

Re: Using RC motors on E-bikes

Hyperion 5045-18 outrunner on ebay for a decent price.. http://cgi.ebay.com/NEW-HYPERION-Z5045-18-TURN-BRUSHLESS-OUTRUNNER-MOTOR_W0QQitemZ110307340599QQcmdZViewItem?hash=item110307340599&_trkparms=72%3A1205|39%3A1|66%3A2|65%3A12|240%3A1318&_trksid=p3286.c0.m14 http://www.aircraft-world.com/prod_data...
by Fumesucker
Nov 04 2008 2:17pm
Forum: E-Bike Technical
Topic: drop in top speed due to cold?
Replies: 12
Views: 1138

Re: drop in top speed due to cold?

Others have already mentioned the battery voltage dropping with decreasing temps. Another thing that has a surprising effect on top speed is increased air density at colder temperatures. This is the reason that people who keep gas logs for their cars find they get better mileage in the summer than t...
by Fumesucker
Oct 29 2008 4:34pm
Forum: E-Bike General Discussion
Topic: New Dealers
Replies: 40
Views: 6983

Re: New Dealers

Hey Link,

Keep on the path you're on now and you have the opportunity to be a world class tech..

See my sig for further explanation. :twisted:

Congrats on the freebie.. Didn't I see on another thread that you had somehow toasted your ride?
by Fumesucker
Oct 29 2008 10:00am
Forum: E-Bike Non-hub Motor Drives
Topic: Resources
Replies: 58
Views: 48449

Re: Resources

Another motor calculator and motor parameter database. http://www.peakeff.com/ Edited to add: This calculator also has an option for calculating motor parameters from input data.. You will need to know the no load current draw and also rpm, current draw and voltage for the motor with two different l...
by Fumesucker
Oct 24 2008 9:07am
Forum: E-Bike Technical
Topic: "Open source" motor?
Replies: 29
Views: 6061

Re: "Open source" motor?

You're right about inventive members, Jeremy..

I found a PM rotor for Delco alternators.

http://www.windbluepower.com/product_p/pma-rot.htm

Image
by Fumesucker
Oct 23 2008 10:08pm
Forum: E-Bike Technical
Topic: "Open source" motor?
Replies: 29
Views: 6061

Re: "Open source" motor?

I pulled apart an old PC power supply and found a nice toroid that would be just the right size to take slices off to make cores.. 1.3 inches OD x 0.625 ID x 0.450 thick.. I have several old supplies in my junk room that should yield toroids of the same or similar size. The first coils I make are go...
by Fumesucker
Oct 23 2008 9:20pm
Forum: E-Bike Technical
Topic: "Open source" motor?
Replies: 29
Views: 6061

Re: "Open source" motor?

Jeremy, Here is a thread about converting an alternator into a brushless motor.. I do believe someone posted a link to a controller specifically made to energize the rotor as well as commutating the stator windings although I don't have time to look through the thread again at the moment. I read so ...
by Fumesucker
Oct 23 2008 8:23am
Forum: E-Bike Technical
Topic: "Open source" motor?
Replies: 29
Views: 6061

Re: "Open source" motor?

After drawing it out I now understand why 24 magnets and 18 coils works. Take a look at the pic below, the circles are the 24 magnets with N and S poles alternating while the wedge shapes represent the 18 coils with the three phases three different colors. Note how each color wedge has the same magn...
by Fumesucker
Oct 22 2008 11:36pm
Forum: E-Bike Technical
Topic: Peak Efficiency: An internet database for motor performance
Replies: 3
Views: 638

Peak Efficiency: An internet database for motor performance

I just found this site for RC brushless motor performance numbers, it has a database with a large number of RC brushless motors and a calculator for determining motor constants from measured data as well as a graphing function to show you the efficiency, power and rpms over a range of currents and v...
by Fumesucker
Oct 22 2008 7:12pm
Forum: E-Bike Technical
Topic: "Open source" motor?
Replies: 29
Views: 6061

Re: "Open source" motor?

There are a wide variety of valid magnet/coil combinations. My BMC uses 16 magnets/18 coils. The Puma uses twice this (32/36). 24/21 might be OK, but I'm not sure. Here's a publication that might be helpful: Thanks for that.. It looks like 24 magnets and 18 windings. I found wedge shaped magnets fo...
by Fumesucker
Oct 22 2008 11:50am
Forum: E-Bike Technical
Topic: "Open source" motor?
Replies: 29
Views: 6061

Re: "Open source" motor?

I'm about to order some magnets for a proof of concept motor, I'm going to get 50 1/2 dia x 1/16 round magnets, I already have all the materials I need for the rest of the motor save for the wire.. I'm going to trim the sides of the round magnets a bit so as to make the magnetic field more dense and...