Author Topic: Pulse Motors- Your building them wrong. (Read 7474 times)

Thaelin · « **Reply #75 on:** September 09, 2023, 09:40:50 AM »

Complete with built in fan for drag.

MagnaProp · « **Reply #76 on:** September 09, 2023, 10:21:45 AM »

Quote from: tinman on September 02, 2023, 01:18:43 AM

Those neo magnets will do the job just fine.
The idea here is to spend as little as possible, and use what you have lying around...

Great. A few parts have arrived, the power unit and such. I'm still searching for a wheel. The one that arrived turned out to be aluminium and not steel as described in the add.

Going to try a Wheelbarrow wheel next. Those usually aren't aluminium.

I've looked at some cast iron flywheels. I've heard those can explode at high revolutions since the metal isn't made for spinning that fast. I've never built a pulse motor so I'm not sure if we get up to such high speeds or not.

i_ron · « **Reply #77 on:** September 10, 2023, 01:10:15 AM »

Hi MagaProp,

I think your concern is a bit misplaced at the speeds we will archive.

Quote

The maximum revs of cast iron flywheel depends on the type of flywheel and its intended use. Gray iron flywheels can be used as a stock replacement and in mild builds, but should never be associated with racing, high horsepower, sticky drag radial tires, or engines that operate beyond 6,000 rpm[/font][/size]1[/url][/color][/font][/size]. [/font][/size]High-velocity flywheels can have a velocity between 30,000 rpm to 80,000 rpm, and can be adjusted up to 100,000 rpm[/font][/size]2[/url][/color][/font][/size].[/font][/size]
[size=78%]
[/size]
[size=78%]Ron [/size]

citfta · « **Reply #78 on:** September 10, 2023, 01:29:04 AM »

I agree with i_ron. My experience with this motor is you will probably see speeds of between 400 and 600 rpm depending on you building skills and proper tuning.

Carroll

MagnaProp · « **Reply #79 on:** September 11, 2023, 05:41:26 AM »

Thanks i_ron and citfta for the info. I'll try to get something working first then worry about breaking the sound barrier with the speed.

I received this white wheelbarrow wheel today. A magnet sticks to it so that sounds good. The rim is about 8.5 inches diameter and the solid rubber tire was easy enough to cut off with a long box utter and wood chisel I have. It's a wheelboarrow wheel so the bearings aren't exactly super smooth but hopefully we can get it moving. Now to find a way to attache the little metal part to this rim.

Nali2001 · « **Reply #80 on:** September 11, 2023, 01:46:28 PM »

Hi Brad, is there a recommended magnet diameter? I have 20mm and 10mm laying around. Do you tend to keep the diameter of the core of the electromagnet the same diameter as the magnet? What core material do you use. Normal silicon steel lamination should be fine right? Thanks!

Thaelin · « **Reply #81 on:** September 11, 2023, 11:27:59 PM »

Nali:
Brad did mention to keep magnet 90% of a soft iron core. I have 1/2" mags and will use a 9/16" soft bolt with the head cut off.
All:
Have most of the info needed but still have not seen if and when the coil should be shut off for the best results. Still trying to see how the rotor escapes the magnet. Does the two north facing fields make a dead spot?
thay

tinman · « **Reply #82 on:** September 12, 2023, 01:33:32 AM »

Quote

author=Thaelin link=topic=19546.msg582185#msg582185 date=1694467679

[/quote]

Quote

but still have not seen if and when the coil should be shut off for the best results.

That was clearly shown and explained in this video, which is why it is important to carry out this test.
There is no way i can tell you when the coil should be turned on or shut off on each individual motor without seeing the torque curve for that motor. https://www.youtube.com/watch?v=QwbP4b4tlFU

Quote

Still trying to see how the rotor escapes the magnet.

Also clearly explained in the video, where the attraction force was removed from the pull force test by zeroing out the scales, so as to account for the very same force required for the torque plate to leave the gate.

Quote

Does the two north facing fields make a dead spot?

No, there is no 2 facing north fields when the torque plate is leaving the gate, as the coil was switched off long before that.

tinman · « **Reply #83 on:** September 12, 2023, 01:35:45 AM »

Quote from: Nali2001 on September 11, 2023, 01:46:28 PM

Hi Brad, is there a recommended magnet diameter? I have 20mm and 10mm laying around. Do you tend to keep the diameter of the core of the electromagnet the same diameter as the magnet? What core material do you use. Normal silicon steel lamination should be fine right? Thanks!

I would start with the 10mm magnets first.
The core of the electromagnets should be some 10-20% larger in diameter.

tinman · « **Reply #84 on:** September 12, 2023, 01:39:40 AM »

Quote from: Nali2001 on September 08, 2023, 07:34:37 PM

Hi Brad just wanted to run this by you first:

Turns out that it is a bit hard to find a steel rotor 20cm+
I do have a 30x40x 1cm thick plate I can machine to a 30cm circle, but it is aluminum. I can add some steel mass to the center to enhance the weight if needed. So is aluminum ok by you or do you have a theory that is needs to be steel?

Steel helps carry the magnetic fields, so as the torque plates do not become saturated.

Thaelin · « **Reply #85 on:** September 12, 2023, 02:18:29 AM »

Hit a stroke of luck, metal shop close is plasma cutting me a .25 round 9" for only $80 . Should be a sufficient flywheel effect I'd say. So, I guess its off to Ace for the tabs.
thay

Thaelin · « **Reply #86 on:** September 17, 2023, 09:56:13 AM »

Coil done. 2 1/2" neo's glued together. Making a slider for the coil and mags. Shooting for about 1mm on each side of the tab as TM talks. Finally got my head around this I think. 5 ohms on the coil and has good push back on the mags. Still have to drill the rotor for the tabs. Going for 4 tabs at the moment. Big enough for 8 if I want. Will use a hall effect tied to sense mags on shaft and driving a 600v 29A IGBT because it has no body diode. Reason for that is my recovery circuit I am working on. Had a transformer with a 1.2ohm secondary of #20 wire and using only 2 ma. [size=78%] Figure if I collect back as much as possible and send as much possible to rotational force, it will only need a few ma to keep going and up the batts. [/size]
[size=78%] So how is every one getting on? Hope to hear from others soon.[/size]
[size=78%]thay[/size]

i_ron · « **Reply #87 on:** September 17, 2023, 06:26:43 PM »

Sounds good Thay, I have been working on the rotor.

https://youtu.be/RuiKPJUkuXM

Ron

tinman · « **Reply #88 on:** September 18, 2023, 10:13:41 AM »

Quote from: i_ron on September 17, 2023, 06:26:43 PM

Sounds good Thay, I have been working on the rotor.

https://youtu.be/RuiKPJUkuXM

Ron

Very nice Ron.
That should do the trick.

tinman · « **Reply #89 on:** September 18, 2023, 10:14:11 AM »

Quote from: Thaelin on September 17, 2023, 09:56:13 AM

Coil done. 2 1/2" neo's glued together. Making a slider for the coil and mags. Shooting for about 1mm on each side of the tab as TM talks. Finally got my head around this I think. 5 ohms on the coil and has good push back on the mags. Still have to drill the rotor for the tabs. Going for 4 tabs at the moment. Big enough for 8 if I want. Will use a hall effect tied to sense mags on shaft and driving a 600v 29A IGBT because it has no body diode. Reason for that is my recovery circuit I am working on. Had a transformer with a 1.2ohm secondary of #20 wire and using only 2 ma. [size=78%] Figure if I collect back as much as possible and send as much possible to rotational force, it will only need a few ma to keep going and up the batts. [/size]
[size=78%] So how is every one getting on? Hope to hear from others soon.[/size]
[size=78%]thay[/size]

Great to hear Thae.

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Author Topic: Pulse Motors- Your building them wrong. (Read 7474 times)

Thaelin

Re: Pulse Motors- Your building them wrong.

MagnaProp

Re: Pulse Motors- Your building them wrong.

i_ron

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citfta

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MagnaProp

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Nali2001

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Thaelin

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tinman

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tinman

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tinman

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Thaelin

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Thaelin

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i_ron

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tinman

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tinman

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