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Electric Motors - PowerPoint PPT Presentation

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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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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):
The directional relationship of I in the conductor, the external magnetic field and the force the conductor experiences




electric motor
Electric Motor
  • 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
  • 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
  • Armature or rotor
  • Commutator
  • Brushes
  • Axle
  • Field magnet
  • DC power supply of some sort
commutator and brushes
Commutator and Brushes
  • 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.
motion of a current carrying loop in a magnetic field
Motion of a current-carrying loop in a magnetic field










Commutator (rotates with coil)