Thread: Electrical Basics

Try this link for a more accessible, and clearly explained video of modern motor control:

[ame=http://www.youtube.com/watch?v=RXJKdh1KZ0w&feature=youtube_gdata_player]Rockwell Retro Encabulator - YouTube[/ame]

Greg

Hi GQ,

I love it... where can I buy one...

Regards
Ray

Like the man said: wherever Rockwell Automation products are sold. Like all of
my A-B products: ebay. )

here is a explanation

What is an Eddy Current?

Hi RayG,
Here is one I built at work, ill let you have it for $40K ... Just kidding.
Its the unit I built for when we are doing Motor Starting Training, shows the different starting methods and on the HMI can show the differances in current, torque and temperature from the different starting methods being DOL, Star/Delta, Auto Transformer, Liquid Resistance, Soft Start and VSD.
The picture was taken when I was near the end of building it.

Regards,
Keith.

Originally Posted by Greg Q

Try this link for a more accessible, and clearly explained video of modern motor control:

Rockwell Retro Encabulator - YouTube

Greg

It's original use was in a transmission, again by Rockwell.


[ame=http://www.youtube.com/watch?v=yjXTOlsE8k0]The Turbo-Entabulator - YouTube[/ame]

Originally Posted by morrisman

I've read through AC 1 ..it's easy to understand , in plain language .

They don't mention why the stator and rotor are made from thin laminations . Is it eddy currents ? Eddy Currents induced into a large single lump would degrade the performance ?

MIKE

Yes that is correct. The idea of laminations is to provide high surface contact impedance to current flow. That current would otherwise create useless heating and thus waste of energy.They are thin so that their intrinsic impedance is also high.

Originally Posted by Greg Q

Like the man said: wherever Rockwell Automation products are sold. Like all of
my A-B products: ebay. )

I think the special offer ended a week ago.
Regards

Originally Posted by Keith_W

Hi RayG,
Here is one I built at work, ill let you have it for $40K ... Just kidding.
Its the unit I built for when we are doing Motor Starting Training, shows the different starting methods and on the HMI can show the differances in current, torque and temperature from the different starting methods being DOL, Star/Delta, Auto Transformer, Liquid Resistance, Soft Start and VSD.
The picture was taken when I was near the end of building it.

Regards,
Keith.

Hi Keith,

It's a bit hard to see, but does yours stop ellipsoidal depleneration in Milford Trunions like the Rockwell one?

Regards
Ray

I'm going to listen to that a few times and write down some of the better "technical terms"
I'll feed it to the engineers next time they ask me what I found to repair a fault.
They will not want to admit that they don't have the faintest idea of what i'm talking about and will nod agreeably and tell me well done.

Originally Posted by NCArcher

I'm going to listen to that a few times and write down some of the better "technical terms"
I'll feed it to the engineers next time they ask me what I found to repair a fault.
They will not want to admit that they don't have the faintest idea of what i'm talking about and will nod agreeably and tell me well done.

LOL, that should get them.

Dave

Originally Posted by NCArcher

I'm going to listen to that a few times and write down some of the better "technical terms"
I'll feed it to the engineers next time they ask me what I found to repair a fault.
They will not want to admit that they don't have the faintest idea of what i'm talking about and will nod agreeably and tell me well done.

LOL With all the talk about laminations, reminds me you can floor most of them by mentioning Hysteresis losses.

I can remember, standing around with a group of guys discussing some obscure technical problem, when one of them said, "maybe it's an issue with the LRT..?"

No one asked, eventually someone asked "what's an LRT", to which the guy replied pointing at a red led, "little red thing"...

Regards
Ray

A factory manager I know of thought he could make transformers much cheaper by using 1mm lamination steel in place of 0.5mm.

Stuart