Search found 23 matches

by Archer321
Feb 08 2019 11:02pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 180
Views: 3693

Re: APL's DIY axial-flux motor

I didn't know that one side is stronger than the other, and 2 to 3 times stronger than a standard magnet array. Halbach arangement.jpg One thing I recently learned about halbach arrays is that while they do shift the majority of the field to one side of the magnets, they don't create an even field ...
by Archer321
Jan 23 2019 10:33pm
Forum: Motor Technology
Topic: Air gap, magnet shape, and voltage questions
Replies: 10
Views: 291

Re: Air gap, magnet shape, and voltage questions

There you go. Different voltage models have different voltage and torque constants, so obviously are wound differently. Generally speaking, small change in air gap doesn't significantly or consistently affect the efficiency. Regards, major I didn't see anything on the sheet to indicate that the dif...
by Archer321
Jan 23 2019 9:07pm
Forum: Motor Technology
Topic: Air gap, magnet shape, and voltage questions
Replies: 10
Views: 291

Re: Air gap, magnet shape, and voltage questions

Screenshot_20190123-194348_crop_539x833-404x624.png
Screenshot_20190123-194348_crop_539x833-404x624.png (283.81 KiB) Viewed 174 times
I have to assume that the speed is limited by the controller as it doesn't change proportionally with voltage on the chart.

Even so, no one has an opinion on why efficiency would increase with a larger air gap?
by Archer321
Jan 20 2019 9:54pm
Forum: Motor Technology
Topic: Air gap, magnet shape, and voltage questions
Replies: 10
Views: 291

Air gap, magnet shape, and voltage questions

So I'll apologize in advance for the long post with lots of questions... Sorry. I'm running a Heinzmann PMS126 axial flux motor in my Electrathon car. It operates on 36v due to my battery weight restrictions although the controller (an ACD 4805) can supposedly handle up to 60v and according to the s...
by Archer321
Jan 20 2019 1:28am
Forum: Motor Technology
Topic: Ferrite as a stator material?
Replies: 17
Views: 1425

Re: Ferrite as a stator material?

I would think so. Less loss = more efficient. Go one step further and use an ironless motor. Interesting thought...but my understanding is that ironless motors are less efficient although I'm not sure why. Perhaps the benefit of having the "iron" in the stator to augment and channel the flux of the...
by Archer321
Jan 20 2019 12:08am
Forum: Motor Technology
Topic: Ferrite as a stator material?
Replies: 17
Views: 1425

Re: Ferrite as a stator material?

Ok, but if torque density is ignored for a moment, does a ferrite stator make for a more efficient motor?
Even if the motor has to be made physically larger to achieve the desired output.
by Archer321
May 18 2018 1:36pm
Forum: Items for Sale - Used
Topic: Heinzmann PMS126 motors, ACD4805 motor controller
Replies: 9
Views: 797

Re: Heinzmann PMS126 motors, ACD4805 motor controller

I'm guessing you sold the running one?
The Craigslist ad now says four instead of five...
by Archer321
May 17 2018 12:09am
Forum: Items for Sale - Used
Topic: Heinzmann PMS126 motors, ACD4805 motor controller
Replies: 9
Views: 797

Re: Heinzmann PMS126 motors, ACD4805 motor controller

I'll think about it.
I will be over that way in July...
by Archer321
Jan 21 2018 2:10pm
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

To: kirk@shiftev.com Dear Sir: Am writing to you in your capacity as President of Electrathon America... I stumbled across battery-electric vehicles about 20 years ago, and haven't bought fossil fuels for personal use for decades. HOWEVER, I am... bothered... to read that your organization still pr...
by Archer321
Jan 20 2018 10:04pm
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

Well it's largely a student engineering competition (there are a few adults racing at each event) with kids being overseen by an adult or two per team. While an adult might cheat on their own, it would take a particular type of a**hole to endorse their kids cheating. All that being said... I would r...
by Archer321
Jan 20 2018 7:47pm
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

I imagine one day, someone who has been driven to the brink of insanity by coming second every year since 1990, will buy 70lbs of Lithium, gut two very standard looking SLAs, fit them inside then create a tiny layer of acid and lead on top in case a race official tries to remove a valve to inspect ...
by Archer321
Jan 20 2018 2:39pm
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

They do.
The standard class is 72lbs or less of lead acid.
All other battery chemistries fall into the "Advanced Battery" class and they have weight restrictions unique to the specific types.
I think li-po is 16lbs or so.
by Archer321
Jan 20 2018 8:58am
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

Sunder wrote:
Jan 20 2018 7:19am
amberwolf wrote:
Jan 20 2018 2:24am
Archer321 wrote:
Jan 19 2018 7:25pm
Gotta have lead.
Rules.
You must live in a really wierd place to require lead-type batteries on your bikes (or other vehicles).
Could be a competition or race?
Indeed it is a competition...
Electrathon.
by Archer321
Jan 19 2018 10:24pm
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

I've never heard of those before. ADVANTAGES * Capacity has been increased 10 - 16%; * Cycle life has been increased 50% more; * Low/High Temperature performance has been improved 30-40%; * Water Loss rate has been decreased 40%; * Large power discharge capability has been increased 15%; * Special ...
by Archer321
Jan 19 2018 7:25pm
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Re: Chilwee lead-graphene battery

Gotta have lead.
Rules.
Thanks for the heads up though.
Maybe I'll try the sample route.
by Archer321
Jan 19 2018 8:02am
Forum: Battery Technology
Topic: Chilwee lead-graphene battery
Replies: 19
Views: 1492

Chilwee lead-graphene battery

I found an interesting looking battery online but can't find a place to actually buy some unless I order 200 units off Alibaba.
Anybody got an idea?
http://www.cnchaowei.com/en/product9.php

https://m.alibaba.com/product/605975553 ... 5-3Ah.html
by Archer321
Nov 01 2016 11:11pm
Forum: Motor Technology
Topic: Ashwoods Axial Flux motors
Replies: 3
Views: 1485

Re: Ashwoods Axial Flux motors

I've been keeping an eye out for a used Elmo80 motor from these guys. New ones are out of my budget.
They do look interesting.
by Archer321
Oct 30 2016 11:36am
Forum: Motor Technology
Topic: help me chose a motor for my electrathon racer
Replies: 20
Views: 1902

Re: help me chose a motor for my electrathon racer

So it sounds like your efficiency point was determined mathematically. I don't have access to any real performance data from the manufacturer on my motor so I have had to determine my efficiency point empirically. It will be interesting to see if your real-world data supports the mathematical models...
by Archer321
Oct 20 2016 3:58pm
Forum: Items Wanted
Topic: Heinzmann PMS motors wanted
Replies: 0
Views: 237

Heinzmann PMS motors wanted

Looking for some heinzmann PMS motors at a reasonable price.
Let me know what ya got....please!
by Archer321
Oct 18 2016 10:32pm
Forum: Motor Technology
Topic: help me chose a motor for my electrathon racer
Replies: 20
Views: 1902

Re: help me chose a motor for my electrathon racer

Glad to hear you are back up and running.
You mentioned running a 9.5:1 drive ratio to keep the motor speed up where it was most efficient.
How did you determine what speed that was?
by Archer321
Aug 13 2016 10:50pm
Forum: Motor Technology
Topic: help me chose a motor for my electrathon racer
Replies: 20
Views: 1902

Re: help me chose a motor for my electrathon racer

Well be sure to keep us updated as you get it installed and test it out.
The occasional pic wouldn't be bad either...
by Archer321
Jul 28 2016 2:21pm
Forum: Motor Technology
Topic: help me chose a motor for my electrathon racer
Replies: 20
Views: 1902

Re: help me chose a motor for my electrathon racer

Any updates on this?
Find a new motor yet?