Nikola Tesla You have to watch this

[Silly Sausage]

My kids think me strange but I flippin loved me O level physics lessons

Physics is brilliant but you need to be seriously clever to go on with it.
Love to have done it but way out of my league beyond school level.

 

[trev]

Going to start my HND soon but apparently it's the maths that's tough there, good job I was good at that

 

[Silly Sausage]

Going to start my HND soon but apparently it's the maths that's tough there, good job I was good at that

Solving 3rd order differentials will be just a stroll along the Tyne with a bag full of Dog for you then...:shades_smile:
In Electrical? Enjoy & good luck with it anyway.

 

[trev]

Well I live near the Tyne and we have a dog so I guess I'm good to go then

 

[Silly Sausage]

Well I live near the Tyne and we have a dog so I guess I'm good to go then

I'll buy you a crate if you get a 1st!

 

[Knobhead]

For interest I just drew on a piece of paper two magnets with the fields reversing and rotating,do me a favour,when you work out the answer,let me know as well

This has just about done my brain in!

It’s the only way I can think to get a two phase motor to run in a set direction.

Now don’t forget the original two phase systems used four wires.

The yellow in the drawing is the shading pole. A single loop of insulated copper embedded in the pole face. Blue and red being the phase coils.
View attachment 11549
Any other suggestions gratefully received, however inane.

The rotor is probably totally wrong. I pinched it from a drawing I was doing for three phase motors

 

[Silly Sausage]

As you well know, I'm no motor (dare I use the word) expert!
Does shading reduce the magnetic field in the area where it is?
If so, the machine in your diagram would run anti clockwise, yes?

Remember, he was a genius so there's probably something we don't know.

Nice diagrams, you been on an Autocad course?

 

[Knobhead]

The shading induces “reluctance” in the magnetic field as far as I remember. IE weakening the field to one side of the pole and giving a kick to the other side. Once the motor is running the shaded pole has little effect. Rotation that depends on the lay out of the rotor.

Please remember, this is from memory and theory. I can’t find anything on the net to back it up.

 

[Silly Sausage]

The shading induces “reluctance” in the magnetic field as far as I remember. IE weakening the field to one side of the pole and giving a kick to the other side. Once the motor is running the shaded pole has little effect. So yes the motor should run counter clockwise.

Please remember, this is from memory and theory. I can’t find anything on the net to back it up.

We better get advice from elsewhere then.

Mmm...sounds reasonable. Got me thinking about single phase cap run motors, I'll stick with instruments, much easier.

 

[Knobhead]

Nice diagrams, you been on an Autocad course?

Would love to do “proper” AutoCad drawings. I use AutoSketch. It’s a pig to use, it was written for Windows 3.11 (it’s that old). I have to thrash it in to submission to getting it to run under XP. Like AutoCad it’s capable of minute detail when you zoom in. the motor drawing took about 2 hours and then had to be taken in to Photoshop to colour it.

PS the drawing is wrong, I've only just spotted it. To late to edit.

This is the correct version. See if you can spot the difference.

View attachment 11571

 

[Guest111]

Oh happy days in the physics lab,used to love pouring mercury from one hand to the other,I remember our first day with reactive metals (sodium lithium potassium etc) our physics teacher holds up one hand and says "right lads I know some of you wondered how I lost part of two fingers,well this is how" and proceeded to tell us how when he was at school he had pinched a large chunk of potassium and wrapped it in paper to take home potassium reacts with moist air as well as water and on the way home it rained the stuff ignited in his pocket and he ended up having part of 2 fingers amputated due to severe burns, he finished of with the immortal words"now anyone still feel like sticking a piece in your pocket for later?"Nobody did , we may not have had laptops but by god we made some cracking explosions!

 

[Knobhead]

A friend owned a little craft shop, she’d made a few enemies along the way.
So I get a phone call one morning;
“Tony, I’ve fond an old rusty tin on the back of a shelf”.
“OK what about it, any label on it?”
“¼oz sodium in vacuum”.
“Don’t touch it, shut the shop, I’ll be there in 20 minutes and I’ll take it to work”.

So at work I taped it to a brick pierced a hole in the tin and slung it in to the drainage sump. Nothing happened, so I’m wandering back to the workshop dejected. While my back was turned there was an almighty explosion, about 100 tonnes of water and quarry slurry erupted like an atomic bomb mushroom cloud. The wind then caught it, the workshop and the plant were a strange brown s*** colour. It took months for the rain to wash it off.

 

[ringer]

...
PS the drawing is wrong, I've only just spotted it. To late to edit.

This is the correct version. See if you can spot the difference.

View attachment 11571

The lower blue coil was wound the wrong way, which you have now corrected. Motor would stall.
There is another error. Can you spot it?

 

[Guest111]

A friend owned a little craft shop, she’d made a few enemies along the way.
So I get a phone call one morning;
“Tony, I’ve fond an old rusty tin on the back of a shelf”.
“OK what about it, any label on it?”
“¼oz sodium in vacuum”.
“Don’t touch it, shut the shop, I’ll be there in 20 minutes and I’ll take it to work”.

So at work I taped it to a brick pierced a hole in the tin and slung it in to the drainage sump. Nothing happened, so I’m wandering back to the workshop dejected. While my back was turned there was an almighty explosion, about 100 tonnes of water and quarry slurry erupted like an atomic bomb mushroom cloud. The wind then caught it, the workshop and the plant were a strange brown s*** colour. It took months for the rain to wash it off.

could be a bit interesting if we were to mix then couldn,t it? you know big boys toys and all that lol

 

[Knobhead]

The lower blue coil was wound the wrong way, which you have now corrected. Motor would stall.
There is another error. Can you spot it?

Go on you've get me.

PS remember this is theory, I can't find proof of it.