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Search: Posts Made By: unime
Showing results 1 to 50 of 123
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Forum: Electric Bikes
03-27-09, 11:32 AM
Replies: 3
Views: 765
Posted By unime

Glad I could be of help, John. I'd love to hear...

Glad I could be of help, John. I'd love to hear about your progress, so keep us posted!

Good luck.
Forum: Electric Bikes
03-25-09, 09:25 PM
Replies: 3
Views: 765
Posted By unime

You can find a lot of information through web...

You can find a lot of information through web searches. This (http://visforvoltage.org/forum-topic/testing/421-moderator-testing-o1-chain-wheel-motor-my1018) page, for example, talks about modifying...
Forum: Electric Bikes
03-22-09, 01:20 PM
Replies: 6
Views: 1,603
Posted By unime

JinbaIttai may have said it best, but here's my...

JinbaIttai may have said it best, but here's my reaction to Mabman's spew.


There is no false advertising going on. What you see in the ads is real. For what its worth, some very discerning...
Forum: Electric Bikes
03-22-09, 12:05 AM
Replies: 6
Views: 1,603
Posted By unime

First, let me thank you! This discussion belongs...

First, let me thank you! This discussion belongs in a thread of its own. Even if we end up disagreeing I welcome it.

Now then, conflict between user groups seems to be more rule than exception...
Forum: Electric Bikes
03-17-09, 09:50 PM
Replies: 31
Views: 7,818
Posted By unime

One more time: The federal law defining low...

One more time: The federal law defining low power electric assist bikes does not address the legality of using them.

New Hampshire's vehicle code defines bicycle as "every pedalled vehicle...
Forum: Electric Bikes
03-16-09, 01:31 PM
Replies: 5
Views: 1,721
Posted By unime

Where I live, homeowners/renters policies exclude...

Where I live, homeowners/renters policies exclude motor assisted bicycles. I had to get a motorcycle (moped) policy.

There was a thread about a denial of coverage when I joined the forum last...
Forum: Electric Bikes
03-16-09, 11:15 AM
Replies: 31
Views: 7,818
Posted By unime

That law defines safety requirements for low...

That law defines safety requirements for low power electric assist bikes, and places their regulation under CPSC control, rather than NHTSA. It does not address licensing requirements, which are...
Forum: Electric Bikes
03-16-09, 12:08 AM
Replies: 31
Views: 3,800
Posted By unime

Get a grip, man. You are losing it! Lest...

Get a grip, man. You are losing it!

Lest anyone misunderstand my position, I do not support riding ebikes in areas where they are prohibited. And for goodness sakes, ride carefully, wear...
Forum: Electric Bikes
03-15-09, 06:43 PM
Replies: 31
Views: 3,800
Posted By unime

Mabman was trying to convince me, since I live in...

Mabman was trying to convince me, since I live in Colorado. The problem is that his evidence is a memo that doesn't support his case (the memo is only a partial list of vehicles, and it mentions...
Forum: Electric Bikes
03-14-09, 09:40 PM
Replies: 31
Views: 3,800
Posted By unime

Tell that to the cyclist who passed me riding up...

Tell that to the cyclist who passed me riding up a steep road. To be fair, he was very fit and riding a very nice looking racing bike (that may well have been in the Optibike price range), while I...
Forum: Electric Bikes
03-14-09, 11:46 AM
Replies: 31
Views: 3,800
Posted By unime

Does the 400 watt Optibike model qualify as an...

Does the 400 watt Optibike model qualify as an "answer"? What about the 600 watt version? What about my 800 when I ride it in low power mode (which I use frequently)?

In fact some Optibike...
Forum: Electric Bikes
03-13-09, 03:43 PM
Replies: 31
Views: 3,800
Posted By unime

Am I wrong to assume you were looking for a...

Am I wrong to assume you were looking for a reason to reject the Optibike?

You get very nice components for $14k, to be sure. If the web site doesn't have the info you need at the moment (they're...
Forum: Electric Bikes
03-02-09, 07:11 PM
Replies: 4
Views: 731
Posted By unime

There is no significant voltage drop across the...

There is no significant voltage drop across the switch when it is closed, and it will be closed before you engage the motor, so the question is whether it can switch minimal current at battery...
Forum: Electric Bikes
02-25-09, 10:19 AM
Replies: 74
Views: 30,639
Posted By unime

You still don't get it! "Parallelism" is not the...

You still don't get it! "Parallelism" is not the issue. What matters is the number of turns and the cross sectional thickness of the wire. It pretty much does not matter whether you wind with one...
Forum: Electric Bikes
02-24-09, 10:48 PM
Replies: 74
Views: 30,639
Posted By unime

Puzzling? Your results confirm exactly what I...

Puzzling? Your results confirm exactly what I have been telling you.

As I have been explaining, Kv is inversely proportional to turns (and independent of winds). In other words, Kv*turns is a...
Forum: Electric Bikes
02-23-09, 12:34 PM
Replies: 74
Views: 30,639
Posted By unime

One more time, no. The number of windings has...

One more time, no. The number of windings has essentially zero effect on motor speed. Changing the number of turns affects Kv. You are abusing terminology by linking these two concepts. They are...
Forum: Electric Bikes
02-22-09, 09:22 PM
Replies: 74
Views: 30,639
Posted By unime

Uh... Hello! Have you been listening? Litz...

Uh... Hello! Have you been listening? Litz wire will not help. It is wasted expense. End of story.
Forum: Electric Bikes
02-22-09, 09:19 PM
Replies: 74
Views: 30,639
Posted By unime

Changing windings from serial to parallel has...

Changing windings from serial to parallel has zero effect on the power performance of a motor. None. Nada. Zilch. It doubles the current and halves the voltage, but resistive losses are exactly...
Forum: Electric Bikes
02-22-09, 12:18 PM
Replies: 74
Views: 30,639
Posted By unime

If you want to change the "gearing" of a hub...

If you want to change the "gearing" of a hub motor, rewing it with a different number of turns, or (for brushless) switch it from delta to wye or vice versa.

I'm sure some of the "pros" know what...
Forum: Electric Bikes
02-21-09, 08:33 PM
Replies: 74
Views: 30,639
Posted By unime

Safe - you can quote equations all you like, but...

Safe - you can quote equations all you like, but that doesn't mean you are applying them correctly. The parallel inductance equation simply doesn't apply when the coils are wrapped around the same...
Forum: Electric Bikes
02-21-09, 12:10 AM
Replies: 74
Views: 30,639
Posted By unime

No. That's not what is going on with multiple...

No. That's not what is going on with multiple windings. When you connect several identical windings on the same core in parallel, the inductance doesn't change. That's because the same magnetic...
Forum: Electric Bikes
02-20-09, 11:31 AM
Replies: 74
Views: 30,639
Posted By unime

What do you want to accomplish? If your...

What do you want to accomplish?

If your motor is running hot, then rewinding (with the same number of turns and thicker wire) might just help. Then again, it might not. Your losses are probably...
Forum: Electric Bikes
02-18-09, 10:45 PM
Replies: 12
Views: 5,209
Posted By unime

Rolling resistance is not significantly related...

Rolling resistance is not significantly related to tire size, except that fatter tires are generally run at lower pressures, which will increase RR. To find the required tire width, you need to...
Forum: Electric Bikes
02-18-09, 01:04 PM
Replies: 74
Views: 30,639
Posted By unime

[QUOTE=safe;8381946]High voltage is a way to...

[QUOTE=safe;8381946]High voltage is a way to overcome the downside of motors that are naturally of higher resistance.

The DC resistance of motors typically has only a small effect on efficiency or...
Forum: Electric Bikes
02-16-09, 03:42 PM
Replies: 16
Views: 1,470
Posted By unime

For the record, high end full suspension bikes...

For the record, high end full suspension bikes ride pretty well on the street. There are a bunch of enthusiasts (including me) riding full suspension Opibikes, and I haven't heard anything but...
Forum: Electric Bikes
02-15-09, 05:39 PM
Replies: 60
Views: 4,470
Posted By unime

You can say it, but how about explaining what you...

You can say it, but how about explaining what you mean? Applying full power both down hill and up obviously wins (DUH!) when motor power is limited but batteries are not. Using your "rules"...
Forum: Electric Bikes
02-15-09, 03:45 PM
Replies: 60
Views: 4,470
Posted By unime

And...? Are there power or energy restrictions? ...

And...? Are there power or energy restrictions? Are they the same for both riders? Uphill and downhill? Regeneration doesn't help in a race if the participants can pack enough battery to run the...
Forum: Electric Bikes
02-15-09, 02:32 PM
Replies: 60
Views: 4,470
Posted By unime

Cool Your presentation does not make sense. If the...

Your presentation does not make sense. If the bikes have a limit on motor input power and unlimited battery capacity, riders will just run full throttle all the way and any attempt at regeneration...
Forum: Electric Bikes
02-13-09, 07:52 PM
Replies: 6
Views: 816
Posted By unime

My experience with the XR has been far better on...

My experience with the XR has been far better on roads than off. It is a very firm tire that prefers to ride over irregularities instead of conforming to them like an off road tire would. This...
Forum: Electric Bikes
02-13-09, 07:26 PM
Replies: 60
Views: 4,470
Posted By unime

WRONG! What you have shown is that Regen...

WRONG!

What you have shown is that Regen loses when he chooses a poor strategy. If I were riding against Freewheel under the proposed conditions, I would win. Maybe you can figure out why.
...
Forum: Electric Bikes
02-10-09, 12:00 AM
Replies: 60
Views: 4,470
Posted By unime

There you go, making assumptions again - motor...

There you go, making assumptions again - motor limitations are not necessary. If I were running a race, I'd limit battery capacity, and let competitors run whatever motor and controller they care...
Forum: Electric Bikes
02-09-09, 10:47 AM
Replies: 60
Views: 4,470
Posted By unime

OK. Now I'm guilty of not reading your new...

OK. Now I'm guilty of not reading your new scenario carefully and misunderstanding it.

My problem with you is that each time I debunk one of your scenarios, you come back with a different...
Forum: Electric Bikes
02-08-09, 10:56 PM
Replies: 60
Views: 4,470
Posted By unime

Safe, I don't know how to say this more clearly...

Safe, I don't know how to say this more clearly but you are wrong, flat wrong, plain wrong, simply wrong, and almost completely wrong. I've shown you your mistakes and will show you new ones as they...
Forum: Electric Bikes
02-08-09, 06:04 PM
Replies: 60
Views: 4,470
Posted By unime

I'm sorry, but I can't completely make sense of...

I'm sorry, but I can't completely make sense of your calculations. For one thing, multiplying watt hours and horespower gives power squared, a unit I have never encountered a use for. You also made...
Forum: Electric Bikes
02-07-09, 10:59 PM
Replies: 9
Views: 881
Posted By unime

Ferromagnetic materials interact strongly with...

Ferromagnetic materials interact strongly with magnetic fields, spontaneously aligning their magnetic dipoles (electron spins). Iron (thus the "ferro") and Cobalt are example of ferromagnetic...
Forum: Electric Bikes
02-07-09, 10:14 AM
Replies: 60
Views: 4,470
Posted By unime

You can put an equal sign between those two...

You can put an equal sign between those two terms, but that doesn't make it a valid equation. I have already given you two counterexamples: First, regeneration user to recover energy during...
Forum: Electric Bikes
02-06-09, 08:48 PM
Replies: 60
Views: 4,470
Posted By unime

So regenerative braking is likely to make race...

So regenerative braking is likely to make race cars go faster, but slows bicycles??? I don't think so. You have put forth a strawman argument by asserting that regeneration used on bicycles must be...
Forum: Electric Bikes
02-06-09, 03:33 PM
Replies: 60
Views: 4,470
Posted By unime

Regeneration does not need to be implemented as a...

Regeneration does not need to be implemented as a drag brake. There are ebikes out there that sense brake lever position and activate regeneration when the lever is first activated, but before the...
Forum: Electric Bikes
02-06-09, 02:59 PM
Replies: 9
Views: 881
Posted By unime

Sort of. Allowing the magnetic field to escape...

Sort of. Allowing the magnetic field to escape the motor's housing is a sign of ineficiency - it means the magnetic circuit in the motor is leaky. Adding ferromagnetic parts outside such a motor...
Forum: Electric Bikes
02-05-09, 05:46 PM
Replies: 12
Views: 5,209
Posted By unime

What kind of stability are you looking for? I've...

What kind of stability are you looking for? I've bombed downhill on my 26x2" tires at over 50 mph (80 kph) and felt totally solid. A wider tire could be used at lower pressure on a hub motor wheel...
Forum: Electric Bikes
02-03-09, 05:38 PM
Replies: 5
Views: 1,776
Posted By unime

Your friend gave you some very bad advice. I'm...

Your friend gave you some very bad advice. I'm afraid that reversing the polarity probably destroyed the controller.

The DC motor, on the other hand, can be connected either way. Reversing the...
Forum: Electric Bikes
01-31-09, 01:35 AM
Replies: 12
Views: 5,209
Posted By unime

I think a 2" tire is more than enough for typical...

I think a 2" tire is more than enough for typical ebikes. Even off road, a 2" tire should be sufficient for moderate uses. Riders who need something beefier likely know it already.



I...
Forum: Electric Bikes
01-29-09, 02:45 PM
Replies: 6
Views: 1,199
Posted By unime

I don't think you appreciate the steepness of the...

I don't think you appreciate the steepness of the road our friend in Chiapas has described. Its slope is the same as an intermediate ski slope and although I have ridden straight down such ski...
Forum: Electric Bikes
01-28-09, 10:01 AM
Replies: 6
Views: 1,199
Posted By unime

I don't believe there is any hub motor capable of...

I don't believe there is any hub motor capable of handling a 26% (or steeper!) slope. At least not efficiently. To cope with that kind of climb, the motor will need to be geared waaaaay down. I...
Forum: Electric Bikes
01-28-09, 12:30 AM
Replies: 7
Views: 2,223
Posted By unime

One key difference is that the CA uses a remote...

One key difference is that the CA uses a remote shunt (sensor), so you don't have to run big wires from battery-display-motor controller. Not only are the wires bulky, but the extra length means...
Forum: Electric Bikes
01-28-09, 12:22 AM
Replies: 18
Views: 1,909
Posted By unime

Expect to pedal a lot on steep inclines. Even...

Expect to pedal a lot on steep inclines. Even with an 800 watt motor driving the chain (i.e. with selectable gears), I have to pedal a little when inclines get seriously steep. Modest hub motors...
Forum: Electric Bikes
01-23-09, 02:15 PM
Replies: 22
Views: 2,289
Posted By unime

Read some of the ham radio boards and you'll see...

Read some of the ham radio boards and you'll see lots of people have inconsistent results using pliers style crimpers. If you want to use that technique - fine. If you want recommend it - that's up...
Forum: Electric Bikes
01-23-09, 11:26 AM
Replies: 22
Views: 2,289
Posted By unime

A proper crimp evenly squeezes the contact...

A proper crimp evenly squeezes the contact barrel, mashing it hard against the copper strands and compressing them so no air pockets remain. The result is a strong connection, both electrically and...
Forum: Electric Bikes
01-22-09, 08:19 PM
Replies: 22
Views: 2,289
Posted By unime

Don't bother with a $15 crimping tool. Suitable...

Don't bother with a $15 crimping tool. Suitable tools have dies shaped precisely for the Anderson contacts. I have the West Mountain Radio version ($55), but Powerwerx.com sells an appropriate...
Forum: Electric Bikes
01-22-09, 12:08 PM
Replies: 22
Views: 2,289
Posted By unime

Not likely. Try RC hobby or ham radio shops.

Not likely. Try RC hobby or ham radio shops.
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