Electric Motors

1
Electric Motors

• Mastercraft 14.4 V Cordless Reciprocating Saw
• Travis Ricard

2
Objective

• To outline and provide relevant information on
  the following
• The Various Components of an Electric Motor
• How an Electric Motor Works
• Function Within The Reciprocating Saw

3
What Are The Components of An Electric Motor

• Axle
• Commutator
• Armature
• Field Magnet
• DC Power Supply

4
Axle, Armature and Commutator

• The axle contains the armature and commutator
• The armature consists of a set of electromagnets
• An electromagnet is a set of thin metal plates
  stacked together.
• Thin copper wire is coiled around each of the
  plates
• Each end of the wire is soldered onto the plate
  and then wired to the commutator.
• The commutator is a pair of plates attached to
  the axle.
• These plates provide the two connections for the
  coil of the electromagnet.

http//electronics.howstuffworks.com/motor5.htm
5
Field Magnet

• Consists of the motor housing and two curved
  permanent magnets

http//electronics.howstuffworks.com/motor4.htm
6
How Does An Electric Motor Work

• A battery is used to magnetize the coils.
• Creates a magnetic field traveling north to south
  outside the coil
• North end of the coil is attracted the south end
  of the magnet
• Vice-versa for the south end of the coil
• This attraction causes the axel to make half a
  rotation

http//electronics.howstuffworks.com/motor4.htm
7

• In an electric motor the armature takes the place
  of the nail
• As the armature passes through the horizontal
  position, the current flips.
• The magnetic dipole is flipped, which is caused
  by a reverse in electron flow
• The commutator causes the reverse of electron
  flow
• The process continues indefinitely

http//hyperphysics.phy-astr.gsu.edu/hbase/magneti
c/motdc.htmlc2
8
Function Within The Reciprocating Saw

• The electric motor converts the power of the
  battery into mechanical energy
• The motor does work to create rotational motion
• The rotational motion is transferred into linear
  motion to be used for the tools primary purpose.
  

9
Conclusion

• The information presented in this presentation is
  a brief outline of the main ideas regarding the
  main role of the electric motor in the
  Mastercraft 14.4 V Cordless Reciprocating Saw

10
References

• Refer to the below links for further
  information
• http//electronics.howstuffworks.com/motor4.htm
• http//www.phys.unsw.edu.au/hsc/electric_motors4.h
  tml
• http//hyperphysics.phy-astr.gsu.edu/hbase/magneti
  c/motdc.htmlc2