Search found 797 matches

by major
Jul 28 2020 11:40pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

<snip> (Cross section is a bit of a mess, but I've learned a lot since then.) https://endless-sphere.com/forums/download/file.php?id=276879 V2 crosection..jpg Hi APL, Too bad you're having difficulty. Often one pays close attention to the electromagnetic assembly overlooking basic machine design. I...
by major
Jun 29 2020 12:10pm
Forum: Electric Watercraft
Topic: What is this Boat?
Replies: 16
Views: 414

Re: What is this Boat?

Looks nice and my guess is it would work with series connected pack. But for reliability, I've used multiple units for many years without a single issue, my money would go to Minn Kota.
Screenshot_20200629-130208.png
Minn Kota charger
Screenshot_20200629-130208.png (265.27 KiB) Viewed 196 times
major
by major
Jun 29 2020 10:10am
Forum: Electric Watercraft
Topic: What is this Boat?
Replies: 16
Views: 414

Re: What is this Boat?

BTW, if bilge pump runs off 12V, 2 of the 6V batteries, you'll have uneven discharge across the 4 pack. Then issues using a 24V charger. I'd consider getting a Minn Kota 2 by 12V marine charger. It'll at least equalize to 12V. I've never seen a 4 by 6V charger.
major
by major
Jun 29 2020 10:00am
Forum: Electric Watercraft
Topic: What is this Boat?
Replies: 16
Views: 414

Re: What is this Boat?

My guess is it is a PM (permanent magnet) motor. Maybe a Honeywell or Pacific Scientific, maybe Peerless, doesn't look like an Ohio Electric. So likely ceramic magnet stator, guessing 2-pole, wound rotor. Brushes and commutator prone to overheat on overload or long runs on hot days. 2-speed: either ...
by major
Jun 24 2020 7:55pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

... To avoid saturation, I think you have the option of making the tooth longer. APL, Saturation starts limiting at higher flux density, in units of Tesla, which is equivalent to Webers per square meter. So it is the cross sectional area normal to the flux path. A longer tooth means increased magne...
by major
Jun 23 2020 3:18pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

It brings me back to a question that has been nagging me for a while,.. seeing cores like this. I've always wondered, just how important the 'center' of the core is to axial motor operation. It's really the CSA, cross sectional area, which is important to keep the flux density below saturation of t...
by major
Jun 22 2020 1:34pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

The two coil sides cancel. Need area between the conductors carrying current in opposite directions.
major
{edit}
The method shown nets zero current per slot.
by major
Jun 22 2020 11:34am
Forum: Items for Sale - Used
Topic: Deal on motors/wheels
Replies: 48
Views: 2086

Re: Deal on motors/wheels

I got my order last week. One of the motor leads was cut off so near the axle (like 1/4") it will be impossible to splice. So I popped it open. It's a gear drive so it slipped out of the ring gear. Photo attached.
IMG_20200620_145737546.jpg
Bike wheel motor
IMG_20200620_145737546.jpg (324.09 KiB) Viewed 300 times
by major
Jun 09 2020 8:50am
Forum: Items for Sale - Used
Topic: Deal on motors/wheels
Replies: 48
Views: 2086

Re: Deal on motors/wheels

Thanks.
Regards,
major
by major
Jun 08 2020 7:23pm
Forum: Items for Sale - Used
Topic: Deal on motors/wheels
Replies: 48
Views: 2086

Re: Deal on motors/wheels

Hi all,
A box with 2 wheel-motors was delivered today per my order. Brake calipers and nuts/bolts included. All appears in good condition although obviously used somewhat. Does anybody have a link to the motor spec sheet or better yet, a manual? Would be appreciated. Thanks.
major
by major
Jun 05 2020 8:07pm
Forum: Items for Sale - Used
Topic: Deal on motors/wheels
Replies: 48
Views: 2086

Re: Deal on motors/wheels

I received a FedEx tracking number today. Says June 9th. I did send inquiry email yesterday. Fingers crossed.
major
by major
May 26 2020 3:02pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

Two layers of five is better than single layer of ten turns needing longer core. Proximity of turn to steel core is insignificant magnetically, according to Ampere's Law. Folks have a hard time believing that.

Regards,
major
by major
May 20 2020 4:28pm
Forum: Electric Watercraft
Topic: minkota trolling motors
Replies: 5
Views: 452

Re: minkota trolling motors

In that case it depends on what is contained in the top part. What is its function? Got a link to a web page or manual?

major
by major
May 19 2020 10:01pm
Forum: Electric Watercraft
Topic: minkota trolling motors
Replies: 5
Views: 452

Re: minkota trolling motors

steve1981 wrote:
May 19 2020 8:55pm
I recently replaced a 55lb thrust 12 volt motor with a 70 lb thrust motor 24 volt. Can I now use two batteries to run the trolling motor or not? Will the top electrical handle it?
What does this mean? "Will the top electrical handle it?" Top electrical????

major
by major
May 19 2020 7:51pm
Forum: Motor Technology
Topic: electric wheels/hubs
Replies: 3
Views: 241

Re: electric wheels/hubs

Can anyone advise me to some contacts for electric wheels/hubs for vehicles/ light trucks This is the only serious attempt currently of which I am aware. And I doubt they will be successful. https://www.greencarreports.com/news/1128135_lordstown-electric-pickup-will-use-elaphe-in-wheel-motors-made-...
by major
May 16 2020 10:38pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Quality of Kelly Controllers
Replies: 14
Views: 1331

Re: Quality of Kelly Controllers

Alexanderfoti wrote:
May 16 2020 3:58pm
Too high a current setting.....
IMO, a quality controller would protect itself from too high a current regardless of the settings.

major
by major
May 14 2020 11:16pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

:bigthumb: :bigthumb: https://endless-sphere.com/forums/download/file.php?id=273359 This is different than the C-core design. Here the two radial coil sides will pass thru the magnetic circuit carrying the charge (as current) perpendicular to the desired force (tangential), as well as being perpendi...
by major
May 12 2020 10:42pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

Hi APL, That second link is about SRM. You can view the diagrams without sign in. This one did have vectors. Has 15 C-cores/coils and rotor with 12 steel blocks on the periphery. From your post showing a 12 C-cores, I thought those were PMs. 2-Figure2-1.png An interesting oddity but not much good fo...
by major
May 12 2020 3:39pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

Thanks for the reply APL. But what I am interested in is how Lorentz force law is applied to this geometry. Namely the flux, current and force vector directions. Looks to me like the current and force ( or motion, tangential to rotor) are in common direction which doesn't work well with the required...
by major
May 11 2020 10:46pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105533

Re: APL's DIY axial-flux motor

... also the fact that if one uses a 'C' core in a motor, the windings are no where near the core faces, and can't have anything to do with torque other than Lorentz transfer through the steel to the pole face. C cores.jpg ... Hi APL, Could you elaborate on Lorentz transfer for this geometry? Perha...
by major
Mar 31 2020 8:52pm
Forum: Motor Technology
Topic: FEMM Simulation Help
Replies: 4
Views: 156

Re: FEMM Simulation Help

If I'm reading the graphic right, you have essentially no magnetic flux encompassing current carrying conductors except for minor leakage. In other words, no interaction between flux and current.
Regards,
major
by major
Mar 28 2020 8:13am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Quality of Kelly Controllers
Replies: 14
Views: 1331

Re: Quality of Kelly Controllers

I've never owned a Kelly, but have seen many. I was involved with TTXGP for a few seasons back 10 years ago. Maybe half the bikes ran Kelly's. There were bits and pieces of Kelly all over tracks in NA and EU. Looking at post mortem and attempted repairs in the paddock, Kelly internals sucked in desi...
by major
Mar 18 2020 12:49am
Forum: E-Bike Technical
Topic: Phase Amps vs Battery Amps
Replies: 18
Views: 831

Re: Phase Amps vs Battery Amps

Hi guys, This issue was discussed a short time ago. 3-phase power. Here's a short study I did a while back, for a different reason, but it shows some basic formulas. https://www.diyelectriccar.com/forums/showpost.php?p=376274&postcount=9 Regards, major That post is here: https://endless-sphere.com/f...
by major
Mar 02 2020 12:15pm
Forum: E-Bike Technical
Topic: MOTOR GURU'S, CHIME IN!!!: Which of these motors has better performance?
Replies: 11
Views: 760

Re: MOTOR GURU'S, CHIME IN!!!: Which of these motors has better performance?

In picture#1, it is obvious that the rotor which is shown is not the same as the rotor in the motor due to difference in the output shaft end. Also, on the opposite end of the rotor, at the edge of the photo frame, the commutator and wire connections are just visible. The motor may be BLDC, but the ...
by major
Feb 23 2020 11:23am
Forum: Motor Technology
Topic: 75 KW Axial Flux Motor Design Help
Replies: 15
Views: 1247

Re: 75 KW Axial Flux Motor Design Help

Hi ardillo, Very ambitious of you. Too much so, IMO. Suggestion is to start small, say, 0.75 kW. All design characteristic principles are the same. Just scale will save money in long run. Review APL's build thread if you haven't done so. https://endless-sphere.com/forums/viewtopic.php?f=30&t=97860 R...