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06-16-13, 09:00 PM
Replies: 113
Views: 10,459
Posted By safe

http://motorbicycling.com/showthread.php?t=47090&p...

http://motorbicycling.com/showthread.php?t=47090&page=15

Look's like the Motorized Bicycles (not electric) are still being raced, but the electric bikes aren't active anymore.

Sure would have...
05-22-13, 08:52 AM
Replies: 113
Views: 10,459
Posted By safe

Wisconsin is a lot of fun (already) and we aren't...

Wisconsin is a lot of fun (already) and we aren't even fully into festival season yet.

Eventually I'll get back into this hobby, but for now I'm basically just learning the area.

.
03-31-13, 09:58 AM
Replies: 113
Views: 10,459
Posted By safe

Good News... After spending a little over a...

Good News...

After spending a little over a year in Nevada I've decided it's not for me and am in the process of moving back to the midwest to Wisconsin.

I have a friend out there already and...
03-27-13, 10:39 AM
Replies: 113
Views: 10,459
Posted By safe

Some final thoughts on the battery... First,...

Some final thoughts on the battery...

First, the A123 20ah cells packaged in thin fiberglass as plates seem really good.

If I do everything right they work flawlessly.

When I charge I place...
03-22-13, 09:14 AM
Replies: 113
Views: 10,459
Posted By safe

I have my own doubts about the concept. The...

I have my own doubts about the concept.

The recurring problem is always the question:

"Just how fast, how much power?"

...if you go unlimited you create an electric motorcycle, but if you...
03-15-13, 09:35 AM
Replies: 113
Views: 10,459
Posted By safe

Going Into Storage This project was started...

Going Into Storage

This project was started way back in 2007.

It's great to have gotten it running, but I bought an undersized Kelly Controller that seems to be faltering already. The...
03-13-13, 09:06 AM
Replies: 113
Views: 10,459
Posted By safe

Thanks.... ...

Thanks....

http://i.ytimg.com/vi/BxmzLk-ZZVY/hqdefault.jpg?w=600&h=360&sigh=-3TagqtVouoAehjE7QahFxZ-7IY

http://m.youtube.com/watch?v=BxmzLk-ZZVY

There's no way you can make 30 mph look fast...
03-12-13, 08:33 AM
Replies: 113
Views: 10,459
Posted By safe

Everything is working again. Got an old...

Everything is working again.

Got an old computer and have reprogrammed the controller.

The new settings are:

Overvoltage (maxed out) at 45 volts.

Undervoltage 32 volts
03-10-13, 09:01 AM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/1362875239-picsay.jpg

...already getting the first of the fatigue/stress related problems.

There is a crack in the clipon connector.
03-04-13, 05:13 PM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Tire%20Wear.jpg

...finally got leaned over enough to wear in the sides of the tire.

.
03-03-13, 12:35 PM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Bike%20Rack.jpg

Yep. 52"... it was modeled after a Aprilia 250 MotoGP motorcycle from a few years ago.

The dimensions are of a full sized...
03-02-13, 06:06 PM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Bike%20Rack.jpg

...almost done with bike rack.

.
02-23-13, 12:07 PM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Motor%20Current%20vs%20Efficiency.jpg

I'm running 40 amps right now (23 lbs of Force) but plan to increase to 43 amps to get an even 25 lbs of...
02-22-13, 09:55 PM
Replies: 27
Views: 7,196
Posted By safe

My first ebike (Project #001) ran the motor power...

My first ebike (Project #001) ran the motor power through a derailler and so it had six gears.

I did a total of 10,000 miles (really) on that ebike.

Technically it wasn't a bicycle though...
02-22-13, 09:35 PM
Replies: 113
Views: 10,459
Posted By safe

Well I know that 40 amps from a 20ah battery is...

Well I know that 40 amps from a 20ah battery is only 2C and these A123 cells are "supposed" to be able to do 10C or more.

It's still pretty cold here... below freezing in the mornings. Maybe as...
02-22-13, 10:48 AM
Replies: 27
Views: 7,196
Posted By safe

It's also kind of funky if there is one set of...

It's also kind of funky if there is one set of gears for pedal power and another for the motor.

I like the bottom bracket location for a motor, or at least to run through the mainline gearing. ...
02-22-13, 10:21 AM
Replies: 113
Views: 10,459
Posted By safe

Sag Might Not Matter Was pondering the...

Sag Might Not Matter

Was pondering the effect of voltage sag while under full throttle. I'm seeing about a 4 volt sag from full battery voltage when under full load.

But then I think of what...
02-21-13, 10:21 AM
Replies: 27
Views: 7,196
Posted By safe

http://www.imtmotors.com/ebike4.jpg ...

http://www.imtmotors.com/ebike4.jpg

http://www.imtmotors.com/graph01.gif

http://www.imtmotors.com/technology.htm

Technology

The IMT motor is a single sided axial flux permanent magnet...
02-21-13, 09:41 AM
Replies: 113
Views: 10,459
Posted By safe

How to "Trick Out" your Power Supply The...

How to "Trick Out" your Power Supply

The stock (Meanwell clone) power supplies are cheap to buy, but they use an "Inrush Current" regulator (Thermistor) with a pathetic 3 amp limit. Combined with...
02-20-13, 07:27 PM
Replies: 113
Views: 10,459
Posted By safe

A123 20ah Cells 12% Sag @ Full Throttle I...

A123 20ah Cells 12% Sag @ Full Throttle

I finally got a digital voltmeter (big letters ~$3) installed on the ebike and can watch as the voltage sags when I ride.

No throttle : 40 volts

Full...
02-20-13, 10:57 AM
Replies: 27
Views: 7,196
Posted By safe

While we are talking about "perfect world"...

While we are talking about "perfect world" scenarios for motors...

Motor rpm is determined by internal pole count.

My brushed motor has only four magnets and therefore two pole pairs.

Most...
02-19-13, 09:41 AM
Replies: 27
Views: 7,196
Posted By safe

About motors... ...

About motors...

http://www.scorpionsystem.com/files/Other%20Image%20on%20Website/motorIllustration.jpg

It's really a question of "axial" vs "radial" design. Most all RC motors are radial...
02-18-13, 08:12 PM
Replies: 27
Views: 7,196
Posted By safe

http://www.tradesparq.com/uploads/user/0000/0008/5...

http://www.tradesparq.com/uploads/user/0000/0008/5855/product/702397/EDC09C4F1F5B5441ED10020F2BC19984.jpg

What we all need is a high powered and high efficiency pancake (thin) motor.

One of...
02-18-13, 12:08 PM
Replies: 27
Views: 7,196
Posted By safe

Don't forget about cogging... ...

Don't forget about cogging...

http://en.m.wikipedia.org/wiki/Cogging_torque

If you use two motors and hope to have the option of running just one sometimes you better be sure that the...
02-17-13, 11:35 AM
Replies: 113
Views: 10,459
Posted By safe

Surface Charge and Discharge ...

Surface Charge and Discharge

http://www.smartgauge.co.uk/surf_chg.html

A good article...

Basically a Lead Acid battery has a "fast" surface charge, but a slower deeper charge.

The...
02-17-13, 09:38 AM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Watts%20Per%20Pound.jpg

You probably won't make 92 miles because of hills. (hard to predict)

But there have been people who have achieved...
02-16-13, 06:54 PM
Replies: 113
Views: 10,459
Posted By safe

Not sure if you caught what was a surprising...

Not sure if you caught what was a surprising realization when comparing Ironman Triathalons vs Olympic Trials. (graphs in earlier post)

You would "think" that higher performance tasks like the...
02-15-13, 09:48 AM
Replies: 113
Views: 10,459
Posted By safe

Sagging Voltage Update Here's what seems to...

Sagging Voltage Update

Here's what seems to be happening...

At first the 70ah SLA car battery holds it's full charge and the alternator does a float charge on the battery. When you connect the...
02-13-13, 11:57 AM
Replies: 113
Views: 10,459
Posted By safe

http://www.pedalpowergenerator.com/power-lab/18AH-...

http://www.pedalpowergenerator.com/power-lab/18AH-rate-of-discharge-graph-deep-cycle.jpg

My car battery is 70ah and the chart is for 18ah, so multiply the current by about four.

A123 20ah cells...
02-12-13, 10:47 AM
Replies: 113
Views: 10,459
Posted By safe

Very, very impressive work !!! You have...

Very, very impressive work !!!

You have gotten it all right. I agree that 60-90 pedal rpm is the "sweet spot" for cycling. And I like how you've made proper usage of battery side vs motor side...
02-11-13, 10:07 PM
Replies: 113
Views: 10,459
Posted By safe

Update on Charging... Got two out of three...

Update on Charging...

Got two out of three of my 300 watt chargers working today.

I'm using 10AWG wires throughout the ebike and they should handle at least 100 amps before failing, but they...
02-11-13, 09:18 PM
Replies: 113
Views: 10,459
Posted By safe

http://upload.wikimedia.org/wikipedia/commons/0/0c...

http://upload.wikimedia.org/wikipedia/commons/0/0c/Charlesproteussteinmetz.jpg

The Steinmetz Equation
...
02-10-13, 06:22 PM
Replies: 113
Views: 10,459
Posted By safe

Looks good. (your motor with extra bearings) ...

Looks good. (your motor with extra bearings)

I haven't had a chance to even think about my RC motor because right now I'm still fiddling with charging concepts.

Very tired today... 6 hours...
02-08-13, 07:23 PM
Replies: 113
Views: 10,459
Posted By safe

Interesting... When in normal operation the...

Interesting...

When in normal operation the PWM causes the voltage to match the backEMF and current also cycles in the same way:
...
02-08-13, 09:00 AM
Replies: 113
Views: 10,459
Posted By safe

http://e2e.ti.com/resized-image.ashx/__size/550x0/...

http://e2e.ti.com/resized-image.ashx/__size/550x0/__key/CommunityServer-Blogs-Components-WeblogFiles/00-00-00-07-88/4667.Regen_2D00_Plugging-Plot.gif
...
02-07-13, 07:15 PM
Replies: 113
Views: 10,459
Posted By safe

Update on the regen problem... Maximum regen...

Update on the regen problem...

Maximum regen occurs at a very specific place where wheel speed differs from supplied voltage. Yesterday I was trying to gradually ease off the throttle to keep the...
02-07-13, 09:46 AM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Ebike%20-%20Side.jpg

More riding yesterday...

The ebike pulls 28 - 30 mph very easily in most places. The motors brushes are actually still...
02-06-13, 10:58 AM
Replies: 113
Views: 10,459
Posted By safe

I ride on either bike lanes or the street...

I ride on either bike lanes or the street depending on traffic. If no one is around I use the street.

No turn signals or lights, but I have full leathers and a helmet. Sometimes I don't wear my...
02-06-13, 09:47 AM
Replies: 113
Views: 10,459
Posted By safe

30 mph feels slow on long straightaways, but it's...

30 mph feels slow on long straightaways, but it's not bad in tighter situations. There's a section of fairly tight turns nearby my house where I go to test the ebike and when you have the throttle...
02-05-13, 09:35 AM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/16%20tooth%20sprocket.jpg

After three days of welding, cutting and grinding I finally got the new 16 tooth sprocket on the ebike.

The results...
01-23-13, 11:24 AM
Replies: 113
Views: 10,459
Posted By safe

http://i.ebayimg.com/t/2-Pcs-Green-100-Watt-0-1-Oh...

http://i.ebayimg.com/t/2-Pcs-Green-100-Watt-0-1-Ohm-5-Aluminum-Shell-Wire-Wound-Resistors-/00/s/MTEwMFgxMTAw/$(KGrHqZ,!ooFBsd(QfqwBQl2T)FdUg~~60_35.JPG

Update.

My alternator supplies a voltage...
01-21-13, 10:32 AM
Replies: 113
Views: 10,459
Posted By safe

Take your time... I've been fiddling with...

Take your time...

I've been fiddling with those formula's for years. They are so simple, but they are very profound.

Keep in mind that the Steinmetz Equation applies in "extreme situations"...
01-17-13, 10:07 AM
Replies: 27
Views: 7,196
Posted By safe

...I responded to your questions on my thread.

...I responded to your questions on my thread.
01-15-13, 08:07 PM
Replies: 113
Views: 10,459
Posted By safe

Spreadsheet: A: Rpm B:...

Spreadsheet:

A: Rpm

B: ActualVoltage=MIN(MIN(((C17)+(SQRT(C17^2+4*($Voltage)*($LimitBattery*$Resistance))))/(2*$Voltage),1)*$Voltage-C17,$LimitMotor*$Resistance)

C: BackEMF=A17/$kV

D:...
01-15-13, 07:43 PM
Replies: 113
Views: 10,459
Posted By safe

http://b.vimeocdn.com/ts/221/865/221865226_640.jpg...

http://b.vimeocdn.com/ts/221/865/221865226_640.jpg

You might also consider placing the motor between the cranks and rear wheel. This allows you to "step up" rather than "step down" the rpm during...
01-11-13, 01:01 PM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Gearing%2016%20to%20100.jpg

The next state I'm looking to move to has a "motorized bicycle" law that makes 30 mph perfectly legal.

It really...
01-02-13, 12:17 PM
Replies: 113
Views: 10,459
Posted By safe

Yeah. It just seems silly to buy a separate...

Yeah.

It just seems silly to buy a separate (smelly) gas generator to charge in a remote location when everyone already "owns" a generator in their cars alternator. The car does the voltage...
01-02-13, 10:06 AM
Replies: 113
Views: 10,459
Posted By safe

Charging with your Car When I charge I...

Charging with your Car

When I charge I reconfigure the wiring so that in parallel the charge starts at 10 volts (empty) and goes to 11 volts. (full)

So far I'm just using one 400 watt charger,...
01-01-13, 10:28 PM
Replies: 113
Views: 10,459
Posted By safe

http://visforvoltage.org/sites/default/files/u6181...

http://visforvoltage.org/sites/default/files/u6181/Ebike%20-%20Side.jpg

You wouldn't want to ride this on a bike path. (well you might sit upright and goof around, but not race)

The idea is Go...
01-01-13, 11:27 AM
Replies: 113
Views: 10,459
Posted By safe

http://www.aerovelo.com/wp-content/uploads/2012/03...

http://www.aerovelo.com/wp-content/uploads/2012/03/Sam-Whittingham-and-Varna-Diablo.jpeg

A mountain bike is about 0.5, my road racer concept seems to come in at about 0.3, but for hardcore speed...
Showing results 1 to 50 of 160
 


 
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