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Motors and Generators

Motors and Generators . Motors and Generators. Electromagnets Magnet Poles Parts of a Basic DC Motor Electric Generators From the Power Plant to Your Home. Motors and Generators . Small DC Motor. Image courtesy of DOE / NREL. Geothermal Generator. Generator in a Hydro Plant.

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Motors and Generators

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  1. Motors and Generators

  2. Motors and Generators • Electromagnets • Magnet Poles • Parts of a Basic DC Motor • Electric Generators • From the Power Plant to Your Home

  3. Motors and Generators Small DC Motor Image courtesy of DOE / NREL Geothermal Generator Generator in a Hydro Plant Electric Turbine Generator

  4. N S Electromagnets S Electromagnet ends change between north and south depending on the direction of the current. N

  5. N S S S N N N S Magnet Poles Remember that opposite poles attract and like poles repel. If you alternate the middle magnet’s poles, it will continue to spin. This is how motors can turn!

  6. Permanent Magnet Brush DC Source N S Commutator Armature S N Commutator Permanent Magnet Brush Parts of a Basic DC Motor Motor: A device used to convert electric energy into mechanical energy.

  7. Brushes Wire Connections Permanent Magnets Armature Commutator Parts of a Small DC Motor

  8. N S S N Electric Generators Generator: A device used to convert mechanical energy into electrical energy. Mechanical motion turns the armature which creates current. Many DC motors can function as a generator.

  9. From the Power Plant to Your Home Image courtesy of Sacramento Municipal Utility District Power plants generate electricity.

  10. From the Power Plant to Your Home Step up transformers increase voltage for transmission across large towers. Increased voltage increases efficiency.

  11. Images courtesy of DOE / NREL Large towers transmit electricity over long distances. From the Power Plant to Your Home

  12. From the Power Plant to Your Home Step down transformers reduce voltage at substations to acceptable levels for the end user.

  13. Electricity arrives at your home at a junction box. Usage is measured with a meter. From the Power Plant to Your Home

  14. Preparing Your Armature Step One: Wrap the Coil • Cut a 3ft section of Magnet wire • Start coiling the wire 3” from the end of end of the wire. Wrap the wire around a 1”diameter dowel rod until a 3” length remains. • Carefully hold the coil together and pull it off of the dowel rod. Wrap the coil with the 3” lengths you had left at the beginning and end of your coil. Step Two: Sand the Contacts Coil Contact Contact 1) Sand the top half of the contact on one side 2) Sand all the way around the contact on the other side

  15. Motors and Generators • Electromagnets • Magnet Poles • Parts of a Basic DC Motor • Electric Generators • From the Power Plant to Your Home

  16. Image Resources Microsoft, Inc. (2008). Clip Art. Retrieved September 10, 2008, from http://office.microsoft.com/en-us/clipart/default.aspx National Renewable Energy Laboratory (2008). Photographic information eXchange. Retrieved November 5, 2008, from http://www.nrel.gov/data/pix/searchpix.html Sacramento Municipal Utility District (SMUD). (2008). Power plant [Image]. Sacramento: Sacramento Municipal Utility District.

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