Search found 39 matches

by jscoot
Jan 05 2010 10:16am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge

Miles wrote:Randy,

Neither an Astra 3210 or my Planet Ryder motor (your design) will meet the Challenge goal.

Either get cracking on something that will or shut the f*ck up. :)
Have you ever tested your motor for a max continues torque load for 30 minutes ?
Do you think 6 nm would get too hot ?
by jscoot
Jan 05 2010 9:30am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge

Suppose a motor can withstand the torque tests without frying, then whal loaded RPMs would be considered useful for ebike use? :?: i dont recall a loaded rpm # as a requirement to meet the challenge. add to that i personally wont be concerned if i have to suffer the inefficiency of multiple stages ...
by jscoot
Jan 04 2010 9:14pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge

Suppose a motor can withstand the torque tests without frying, then whal loaded RPMs would be considered useful for ebike use? :?:
by jscoot
Dec 30 2009 10:10pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: Rules clarification please

For ages I've been wanting to build a wheel motor, so the total weight would include the original swing arm to which the stator is attached along with the original weight of the wheel. It's not realistic to bring the entire assembly in under the 3kg limit, but I think it's very possible for a high ...
by jscoot
Dec 30 2009 8:03pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

There is some value added input, Thanks guys, Miles, I will let you be the ultimate vote on the final test parameters, it is your challange after all. I will nutshell it for those skimming the chaff in this thread: (my 1st choice for voltage is 36-It is just so attainable by the masses) senario 2 (...
by jscoot
Dec 30 2009 10:27am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Randy, Please could you explain how you can achieve the specified continuous torque output without involving efficiency...? For goodness sake.......... 1970 oz-in is the stall torque for the S28-150 Feel free to enter one, though :P What I ment is highest eficiency FIGURES on the dyno tests not bei...
by jscoot
Dec 30 2009 9:46am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

What do you think about the idea of a competition for the diy motor builders on ES? What would be a suitable goal to work towards? 4Nm of continuous rated torque per kg of motor weight - passive cooling only - for a motor weighing under 3 kg? ...........................................................
by jscoot
Dec 30 2009 8:30am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Miles wrote:Maybe run tests for 80%, 90% then 100% of required output?
33 66 and 100% would show which motors do well at lower power levels.
Is the limit 1000 watts :?:
by jscoot
Dec 30 2009 8:21am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Miles wrote:As we are testing for specific torque, only 3 kg motors would be required to output 12Nm.

First weigh the motor, then calculate the amount of continuous torque required to meet the challenge..... :)
Yes then test it in Thrids ?
by jscoot
Dec 30 2009 8:09am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Good catch, I forgot the temp monitering in that post. I originaly thought measuring at set times of duration will be nessisary also. I am more concerned with the durability of the drive components than smoking a test motor. I suppose if a motor is clearly under stress attempting to make the touque...
by jscoot
Dec 30 2009 7:28am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Lets start a discusion regarding the actual test procedure. I am thinking 36 or 48 volts (I have 56ah of SLA at 48v for testing) 1) start the test at no load & measure rpms & amp draw. 2) apply load to 90% of no load rpm & measure amp draw & foot pounds of tourque. 3+)progress down to 50% of no loa...
by jscoot
Dec 30 2009 7:06am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Miles wrote:
jscoot wrote:I thought the rules only included the motor ? Why not 5 Kg motors if you allow gearboxes/motors? are the rules changing already? :D
Randy, try to understand what I've written before you reply.
Nice to know the rules are set. Now what is the voltage range .... 24 - 100 volts ? :?:
by jscoot
Dec 30 2009 6:21am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

No reductions will be tested unless they are integral to the design. (we will leave reductions to another challange thread of someones creation) :mrgreen: It certainly wouldn't be fair to allow any type of torque multiplication to be included in the testing, integral or not..... If it's not possibl...
by jscoot
Dec 30 2009 6:12am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Jscoot- I really don't see how you think those converted alternators can compare. You've got thick lams with poor copper fill and big flux gaps, stator teeth done in a grouped series arrangement that gives loads of end losses and weird flux patterns, and it's all put together in a package designed ...
by jscoot
Dec 29 2009 6:57pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

I suspose so but it also limits a cost effective easy way to get more efficient drive system motors on the road fast! No, it doesn't. It only limits this particular challenge to a more efficiently powerful lighter motor. ;) There's nothing wrong with spreading the news about PMA motors anywhere you...
by jscoot
Dec 29 2009 4:58pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

At 5Kg I could just use my brushed PMDC 4-pole wheelchair motor, which thru the gearbox (an additional 3 or 4 kg) has enough torque to rip itself off my bike, destroy chains, and yank wheels out of dropouts. ;) 3Kg makes that kind of challenge a lot tougher, *and* it gives back 4.4 pounds that one ...
by jscoot
Dec 29 2009 4:37pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

For specific power, even some dirt cheap RC motors are in the 4.6kw/Kg range. This is with a KV of 130, which easily enables the reduction to be accomplished in a single stage reduction. My own bike is an example of this. Your motor isn't made to direct drive a rear wheel, you must also incur the l...
by jscoot
Dec 29 2009 4:05pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

John, Like I said, larger motors do have an advantage. That's the reason for the 3kg limit. This is the non-hub motor forum :wink: 0.5kg to 3kg should be the range that most people want to work within? A important aspect of having a 5 kg limit would be to enable people to take advantage of reasonab...
by jscoot
Dec 29 2009 4:13am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Are any large RC motor's even made that achieve worse performance in any attribute than the converted alternator motors? They have maybe 5-10x the specific power... It would seem like if you wanted to help guide a motor decision, the RC motors would be well above converted alternator motors. Power ...
by jscoot
Dec 29 2009 3:07am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

) unexpected. cool That is a line from my current favorite movie ever, Meet The Robinsons "keep moving forward" got it for the kids but for a few reasons it is to me rather special. jscoot what you lay out as a test is definitely what i would call the real world end of the testing but it would be r...
by jscoot
Dec 28 2009 6:15am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

I am not here to disrespect anyone or anyones project. i missed that one in my last post. it shows that you have no idea how you come off on paper. im gonna tell you what all the ban's and suspensions from other forums should have told you already . you appear disrespectful, rude and flat out conte...
by jscoot
Dec 28 2009 12:29am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

leaving it alone is your call . not what i ask. just contribute in a constructive manner. if you see the original poster doing something that has an obvious flaw point out a better direction, help them make THEIR version better, telling folks what you have is just plain better is beside the point. ...
by jscoot
Dec 27 2009 4:17pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Randy, I find the car alternator/PMA conversion interesting, but...it really does belong in a separate thread. Starting from scratch is just too expensive and too hard for 99.9% of ebikers who wish for something better Axel was kind enough to send me a rough copy of his DIY 500W RC motor build-inst...
by jscoot
Dec 27 2009 3:41pm
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Enter one in the contest. :) I think we will reach 10-20x the torque/weight ratio of that alternator conversion with our DIY designs. :) I'm working on a 3/4" thick 10" rotor diameter motor that will a third of the weight. Good luck with it. Every motor has it's pros and cons. Some things can be ch...
by jscoot
Dec 27 2009 6:41am
Forum: Motor Technology
Topic: ES DIY Motor Challenge
Replies: 328
Views: 122487

Re: ES DIY Motor Challenge (was "competition")

Enter one in the contest. :) I think we will reach 10-20x the torque/weight ratio of that alternator conversion with our DIY designs. :) I'm working on a 3/4" thick 10" rotor diameter motor that will a third of the weight. Good luck with it. Every motor has it's pros and cons. Some things can be ch...