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Electric Motors. How to build an Electric Motor. http:// www.youtube.com/watch?v=it_Z7NdKgmY. Electric Motor Commutators. http:// www.youtube.com/watch?v=Ue6S8L4On-Y http:// www.youtube.com/watch?v=Xi7o8cMPI0E.

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Presentation Transcript

How to build an electric motor
How to build an Electric Motor

  • http://www.youtube.com/watch?v=it_Z7NdKgmY


Electric motor commutators
Electric Motor Commutators

  • http://www.youtube.com/watch?v=Ue6S8L4On-Y

  • http://www.youtube.com/watch?v=Xi7o8cMPI0E


  • The magnitude of the force on the conductor depends on the magnitude of the current which it carries. The force is a maximum when the current flows perpendicular to the field (as shown in diagram A on the left below), and it is zero when it flows parallel to the field (as in diagram B, on the right):


Left hand rule
Left-hand rule magnitude of the current which it carries. The force is a maximum when the current flows


I

B

F


Electric motor
Electric Motor external magnetic field and the force the conductor experiences

  • An electromagnet is the basis of an electric motor

  • An electric motor is all about magnets and magnetism: A motor uses magnets to create motion.

  • Opposites attract and likes repel. Inside an electric motor, these attracting and repelling forces create rotational motion.

  • A motor is consist of two magnets.


Electric motor animation
Electric Motor Animation external magnetic field and the force the conductor experiences

  • http://www.youtube.com/watch?v=d_aTC0iKO68&safety_mode=true&persist_safety_mode=1&safe=active


Parts of the motor
Parts of the Motor external magnetic field and the force the conductor experiences

  • Armature or rotor

  • Commutator

  • Brushes

  • Axle

  • Field magnet

  • DC power supply of some sort


Commutator and brushes
Commutator and Brushes external magnetic field and the force the conductor experiences

  • Commutator is simply a pair of plates attached to the axle. These plates provide the two connections for the coil of the electromagnet.

  • Commutator and brushes work together to let current flow to the electromagnet, and also to flip the direction that the electrons are flowing at just the right moment.


0 o position
0 external magnetic field and the force the conductor experienceso Position


What happens at 90 o
What happens at 90 external magnetic field and the force the conductor experienceso


90 o position
90 external magnetic field and the force the conductor experienceso Position


Motion of a current carrying loop in a magnetic field
Motion of a current-carrying loop in a magnetic field external magnetic field and the force the conductor experiences

Rotation

F

I

R

N

L

S

F

brushes

Commutator (rotates with coil)


Answers
Answers external magnetic field and the force the conductor experiences


Answers continued
Answers Continued external magnetic field and the force the conductor experiences


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