Making a DC motor

  • Thread starter 33639
  • Start date
  • #1
12
0
Hi there
Currently in my physics class my teacher has assigned us a project where we are to make a DC motor using these items:

2 thumbtacks
1 meter of 14 AWG copper wire
2 paperclips
A block of wood
1 ceramic magnet
1 AA battery
2 connecting wires

My plan is something like this picture
http://farm4.static.flickr.com/3156/2864655414_234d5d3207.jpg

but I was wonder if I could get any tips on how to increase the rmp to maybe something over 5000?
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31
You could try increasing the number batteries, how much you wind the coil, the strength of the magnet.
 
  • #3
Delphi51
Homework Helper
3,407
10
You will have considerable difficulty getting the commutator to work with just those materials. Also, the heavy wire will take a terrible toll on the battery - I hope you are allowed to trade in your dead ones.
 
  • #4
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,297
Interestingly... The fewer turns the faster the motor should spin.

This is because a DC motor accelerates until the back EMFequals the applied voltage and the back emf is proportional to the number of turns. More turns means a lower rpm is required to produce a the required back EMF. For a low power motor affected by friction and air drag it might not be quite that simple so experiment in both directions. Balancing the rotor might be an issue for high rpm.
 
  • #5
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,297
You will have considerable difficulty getting the commutator to work with just those materials.
Hint. The wire is probably enameled.
 

Related Threads on Making a DC motor

  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
1
Views
507
  • Last Post
Replies
2
Views
772
  • Last Post
Replies
13
Views
944
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
2
Views
7K
Top