Electric Motor Secrets

[theremart]

RE: do I want to do this..

Here

http://www.freepatentsonline.com/6632128-0-large.jpg

This is a diagram of usual angle grinder insides. The rotor and the stator looks like in my pictures, only the housing is different.
Also are you sure you want to do this? I mean with an air gap that big, you will probably not see COP>1

I thought you wanted someone to share you pains lol

I am surveying what is out there, I am also interested in going back to the old design of the rod pulled up into the coil. Or to replicate version #1.

It looks like version #1 does not have much torque. but I understand it is to prove the concept not the final product.

[Peter Lindemann]

First Test Model

SWWEEET

Peter, what do you think about that idea that J gave? The coils look very very nice.

This is the $20.00 I saw... can't really tell much about the insides from the diagram..

http://www.harborfreight.com/manuals/91000-91999/91223.pdf

Mart

Mart,

Jetijs is right. This motor will probably not allow COP>1 mechanical energy production. What it will do for you is this. 1) It will allow you to make a fully operational rotary attraction motor by just modifying the rotor (cut some of the lamination lobes off and remove the copper coils). 2) It will allow you to demonstrate all of the "no back EMF" operations for yourself. 3) It will allow you to work out all of the commutator and power switching circuits.

Once you have all of that working well, you might be motivated to make a new rotor with a tighter clearance to increase the mechanical energy production.

Its a better place to start than the PM motors.

Peter

[Jetijs]

Here

http://www.freepatentsonline.com/6632128-0-large.jpg

This is a diagram of usual angle grinder insides. The rotor and the stator looks like in my pictures, only the housing is different.
Also are you sure you want to do this? I mean with an air gap that big, you will probably not see COP>1

[theremart]

Re Grinder..

SWWEEET

Peter, what do you think about that idea that J gave? The coils look very very nice.

This is the $20.00 I saw... can't really tell much about the insides from the diagram..

http://www.harborfreight.com/manuals/91000-91999/91223.pdf

Mart

[Jetijs]

Mart,
I think that those motors are not suitable to convert them in attraction motors, because you do not have a stator. It will be SO hard to make a good stator from scratch. Maybe you could get a grinder motor? Today I disassembled one of my old and broken grinders. I am talking about such one:


And here is what it has inside:









You see, there is a perfect stator inside made of high quality silicon steel. There already are two coils wound on the poles and you have an easy access to the coil wire ends. All you have to do is remove the coil wires form the rotor and cut out some of the rotor poles as Elias did some posts earlier. And you can use the original housing and bearings. This way you can easily modify such motor to run in attraction mod. All that is left, is the circuit and a commutator.
The only disadvantage is the airgap. This one has a total airgap of 1.5mm, that means 0.75mm on each side. This is not very good.
Hope this helps

[theremart]

Replicating Elias motor...

I have picked up 4 cheap $4.00 each dc motors, that I hope to convert to Peter's style of motor. This is a permanent magnet motor, so, my plan is to pull out the magnets and to place in some hand wound coils.

This is a 12V over 3,000 rpm motor not much torque as it is now.

The commutator sure put drag on this motor, I am surprised it put out as much as it did with this much drag.

Anyhow.... will cut off the coils and plan how I will cut down the stator.

Mart

[Jetijs]

Np,
by the way, what do you plan to do with your Lindemann attraction motor V1.0
Do you still need it, use it ...?

Thanx

The V1.0 is assembled and is sitting on the shelf. I use it as a demonstration model that I can show people who are interested. It is easy to explain what the motor is doing using that model
Thanks,
Jetijs

[satchid]

As for the UCC37321 ones I usually order them from Farnell and AFAIK

Lighty,
Thank you, i ordered 10 .

Willy

[aladinlamp]

Thanks aladinlamp
They seem exactly what I need

Np,
by the way, what do you plan to do with your Lindemann attraction motor V1.0
Do you still need it, use it ...?

Thanx

[Peter Lindemann]

Perfect Scales

Thanks aladinlamp
They seem exactly what I need

Jetijs,

These are exactly the kind of scales I use. Get two sets, like AladinLamp did. Then, you'll be ready to measure torque in any power range you want.

Thanks, AladinLamp!!!!

Peter

[Jetijs]

Thanks aladinlamp
They seem exactly what I need

[aladinlamp]

Peter,
I can't find those shunts in the electronics shops here. I mean, there are some of them but they cost about 40$ a piece I will rather take apart some 5$ worth multimeters and get a shunt from them. Also In reality my output leads are connected directly to the capacitor terminals, the circuit drawing is incorrect. I will redraw and post the corrected drawing. In these tests the output winding leads were connected to the capacitor on the input section and the amp meter was connected on the negative lead just before the capacitor and diode. This way it showed what the motor actually consumes and not what it was drawing from the power supply, because the power supply amp readings were lower. I already sent my drawings to the guy who will make the wheel for me (my own attempts failed miserably). As for the scales, before I bought these, I searched all aroud the web and local shops for scales like yours with no much luck. I even went to a chemist equipment shop, but they said, that no one uses such scales anymore, they couldn't even tell where I could get ones. Anyway, I will get the wheel done (with the curcumference exactly 1Ft) and then try these tests again with the scales I already have, then we will see
Thank you,
Jetijs

i bought 2 sets of these, 10 days to arrive to Europe

6 Spring Scales 250 to 5000 Gram/Newtons Scale Balance - eBay (item 190219869236 end time May-11-08 11:01:02 PDT)

[lighty]

Hi all,
I am Willy Gooris from Belgium and new in this Forum. My interest go's heavily towards this motor and read all the post in this tread. I ordered the motor DVD from Peter.


Lighty, I admire your knowledge.

You used UCC3732x driver in the motor controller,

Due to availability of material here, Is there a replacement for the ucc37321 controller from Maxim?

Thanks,

Willy

You can use some other MOSFET/IGBT driver from IR or ST. However, I tested various drivers over the years the UCC3732x ones proved as one of the best when dealing with a high degree of transients and EMI. They're also one of the most stable ones I saw in that price range. There are some even faster, more stable ones but they cost much more and they require additional parts in order to work and in this particular case I think they're not worth the trouble.

As for the UCC3732x ones I usually order them from Farnell and AFAIK you have Farnell representative in Belgium (they hold impressive selection of semiconductors). Look at Farnell NL | 's Werelds voornaamste distributeur van elektronische, elektrische en industriële (MRO) componenten en producten.


Regards

lighty

[Jetijs]

Peter,
I can't find those shunts in the electronics shops here. I mean, there are some of them but they cost about 40$ a piece I will rather take apart some 5$ worth multimeters and get a shunt from them. Also In reality my output leads are connected directly to the capacitor terminals, the circuit drawing is incorrect. I will redraw and post the corrected drawing. In these tests the output winding leads were connected to the capacitor on the input section and the amp meter was connected on the negative lead just before the capacitor and diode. This way it showed what the motor actually consumes and not what it was drawing from the power supply, because the power supply amp readings were lower. I already sent my drawings to the guy who will make the wheel for me (my own attempts failed miserably). As for the scales, before I bought these, I searched all aroud the web and local shops for scales like yours with no much luck. I even went to a chemist equipment shop, but they said, that no one uses such scales anymore, they couldn't even tell where I could get ones. Anyway, I will get the wheel done (with the curcumference exactly 1Ft) and then try these tests again with the scales I already have, then we will see
Thank you,
Jetijs

[satchid]

dyno

Hi Peter,

I just stumbled on this simple to make dyno .

Sci-Spot.com - Dynamometer

Might be something to adapt for the future? Would this be working?

Willy