DC motor help (1 Viewer)

[Shoom]

Hi
I need to build a DC motor for physics, it cant be the one where you have the battery and add the paper clips on the side of the battery and out the copper wire through the clips with the magnet on the battery, its due week 1 next term and I have no ideas what to do,

please provide images easy steps etc, teacher said id get more marks if it starts without me touching it ( ie I dont push the wire to get it to start twirling).

 

[clonestar]

Hey shoom,

You are gonna need some expertise in using your hands to create a working DC motor.

It's a straightforward thing with one vital part the:

SPLIT RING COMMUTATOR

It looks something like this:

()

Get this right and whooshka the coil will rotate..again and again and again.



I could easily make you one but then you wouldn't learn anything would you?

Get building and trust me when you have finished you will learn a lot more to physics than just the concept of the motor effect. There is whole stack of engineering principles in play too tweaking it to work well....

So...

Best of luck and let us know of your outcome and how it all goes. You can post back here if you have any problems and I will try to help.

Regards
C

 

[Shoom]

My teacher just said that we have permission to do Ac motors and AC inductions motors she said the Dc will get least while AC induction will get the most marks, the problem is I have not started the module so I know nothing about the differences between the motors or what they look like.

She also said we get more marks for more complex motors ( getting it to start automatically).

 

[clonestar]

An AC induction motor...

Is she out of her mind?

that squirrel cage needs some heavy metallurgy to be made whilst casting it in a solid iron core along with two ball bearings on either end of the shaft. placing electromagnets around the cage ain't easy without further metallurgy.

I would stick with DC and keep it simple. I have built a DC motor for my class and it is quite easy.

For AC you would need 2 split rings placed around a an armature but the problem is getting the phase correct to align the axis with 50Hz assuming you are using AC Australia spec. The key here is getting the axis in the vertical whilst AC is at 0.02seconds so it flips over and maintains positive torque.

Best bet stick with DC as you can use simple voltages like from an alkaline AA battery and it is SAFE tell your teacher that.... OH and S

To suggest AC is crazy especially if using mains supply. Of course there are transformers to step-down but i don't see every student have one of these trannies at their home to test their AC motor.

Best of luck.

 

[Shoom]

Ok, so AC induction si gone, AC im what can I use as the power source, I know I cant use a battery so......

 

[Shoom]

ok I gathered that I will need an armature, what can I use for this, what is the best way to make one.

I also noticed in some pictures of motors that a pole runs through the aramture and throguh the rest of the motor what is this part?

Please ohw can I make sure that mine starts automatically? i.e I dont need to give it a push or something to get it spinning?

 

[Shoom]

Hi
I am making a DC motor, I will be making a switch ( to get it started autmatically) do the wires from the battery ( voltage supply) have to be connected to my commutator?\

The hardest part is making the switch, I dont even know which type of wires to use for the switch.

Any help with getting the voltage to my motor will be greatly appreciated.

Brushes, the brushes have to touch the commutator correct? is there any particular way the brushes have to touch the commutator, what should I use for the brushes?

Thanks.

 

[crestor]

There is so much info on the net, do alot of research and everything you want to know you will find

I remember doing this last year and I managed, you just have to get the commutator right, if you can manage to do that you will be fine.

 

[Shoom]

Ok, when making my DC motor how can I get the commutator wrong, i.e what erros from the commutator will lead to the motor not working.

 

[Twickel]

Alright my model will consist of two nails on the armature with two commutators, when I wrap the copper wire around each of the nails then where do I connect the wire.

Do I place the loose bit of copper wire from the left nail under the right commutator and the loose bit of wire from the right nail under the left commutator?

Is that right?!!