Can the Segway get up a curb while the rider is in it, like a bike?...
8919
Colin
cjd121@...
Dec 1, 2002 10:08 pm
... Agreed, and this is essentially the same method as I suggested to Randy. However, given that Paul owns only a single "cheapie" analogue meter, then I ...
8920
Colin
cjd121@...
Dec 1, 2002 11:31 pm
... Yes, it sounds like 0.85 ohms is fairly close. Combined with your earlier no-load current measurements, this gives the following motor specs at 24V. SPEED...
... Thanks for what you’ve done already. ... 7.2 AH at what discharge rate? Cheers, Paul S (Looking for additional 12v batteries to experiment with)...
... Me again: Or should it be 0.75? The motor leads were as long as the meter's, and thinner. I didn't allow anything for their resistance....
8924
Colin
cjd121@...
Dec 2, 2002 2:07 am
... Hi Paul, On further reflection, there is something a bit odd about your measurements. It seems to me that either the motor resistance should be higher than...
8925
Colin
cjd121@...
Dec 2, 2002 2:13 am
... At the 20hr rate, as with the specs for all lead-acid batteries. In assist service you may typically get only 60% of that, but that's still a fair bit if...
... I didn't measure it myself. I don't have a suitable rev counter. ... The chap who sold it to me said it was "about 540 @ 24v". His actual measurement was...
Don't you or your neighbor have a drill press? Chuck the shaft up carefully and run the press at some low RPM so as to avoid damaging you or the motor - have...
8928
Colin
cjd121@...
Dec 2, 2002 3:05 am
... It's an imaginative idea, but 540 RPM is only 10.8 Hz, which is lower than any piano note. Chris Pollard's suggestion is excellent, if you know anyone with...
8929
Colin
cjd121@...
Dec 2, 2002 3:10 am
... Go with 0.85 ohms for now, as the motor leads are effectively part of the motor. I would be happier if we had an additional resistance measurement to...
Help! My Charger bike has given it up. Is their anyone nearby who does repairs? (I'm in Champaign, IL USA) I think the torque sensor may have bought it, but we...
I bolted a bean can as a winch drum to my motor this evening and did some testing. It lifted a 12kg anvil 1m in 4 seconds while drawing about 15A from 24 v. If...
I'm looking at adding an electric assist to my Greenspeed Trike. I want to be able to run atleast a mile or two of my work commute at 25- 30 mph (a level road...
8933
Colin
cjd121@...
Dec 2, 2002 10:45 pm
... I love it! Never let me discourage anyone from taking wonderful, down-to-earth measurements like this. I think you have slipped up in the maths though. The...
8934
Colin
cjd121@...
Dec 3, 2002 2:53 am
... I was not able to get much information from the NPC website. Nothing happens when I click "dynonometer tests". When I click "Vantec motor facts" I get some...
Hello All, Here's the latest newsletter from Ed Benjamin of Cycle Electric Group: This newsletter concerns the business of electric bicycles and scooters, and...
In my view, Benjamin's newsletter is peculiar that he doesn't mention Currie products at all, arguably the most reliable and most popular out there. ... I ... ...
... mention ... Maybe he wouldn't make any money off of mentioning them. He is, after all, an "executive", which usually means focusing on the bottom line....
Hey Joe Why bother going to all this trouble when you can get your 25-30 mph from a back wheel hub motor? I too use powered Tadpoles, but I prefer using...
I found another battery and obtained the following results using the string and a tin can method: 12v, 210mA, 288rpm 24v, 250mA, 570rpm 36v, 285mA, 924 rpm I...
Hey Joe<BR> Why bother going to all this trouble when you can get your 25-30 mph <BR> Up hill as well as on the flat? Paul S...
8941
Colin
cjd121@...
Dec 4, 2002 10:17 pm
... Looks like the 570RPM at 24V is about right. Can you explain your "string and tin can" method of measuring RPM? Is a variation of the "wind up the cotton...
... Yes. I fed string onto the can with the motor running for 10 seconds then unwound it carefully counting the turns ... At a couple of points the string...
8943
Colin
cjd121@...
Dec 5, 2002 2:23 am
... Excellent. I think your next measurement should be fairly accurate. ... It's a fair bet that this is a "servo motor", that was used as a tape drive motor...
Hello all, has anyone purchased a gearing upgrade/downgrade kit from scott at ev deals for a currie bike. Are they compatible? Will the clutch gear be...
... Me Again: How should I measure the resistance of the resistor + bulb(s)? Just put my ohmmeter across it? or is it more complicated than that, i.e.; does...
8946
Colin
cjd121@...
Dec 5, 2002 5:49 am
... We don't need to know the bulb resistance - it is only in the circuit to reduce the current a bit. Just wire the 3.3 ohm resistor, bulb, and motor all in...
... Me: Battery, 12.4v 3.3 ohm Resister, 4.3v Motor, 1.3v Circuit, 1.29A So the motor is a whisker under 1 ohm? If this means that the bulb had a resistance of...
