Week 6- DC motor
Objective
- Applying your knowledge about the magnetic field on the DC motor
An electric motor is a device that takes electrical energy in as its input and changes this energy into kinetic, (movement), energy:
There are three basic parts to an electric motor:
1. magnets that create a magnetic field. These may be permanent magnets or electromagnets.
2. Loops of wire that carries a current. This means that there is a current carrying wire that is placed in magnetic field. As a result, a force will be felt by the wire.
3. Commutator. This is a device that allows the current from an external power supply to get to the rotating loop of wire.
1. what happens as you increase the number of loops?
2. what happens as you increase the battery voltage?
3. Apply the right hand slap rule to explain the coils rotation
4. What is a split ring commutator? Why is there a split in middle of the ring?
*A split ring is always used with a D.C supply: the split commutator is used to change the direction of the current (and hence force) every half rotation. Each half of the ring is a metallic conductor, which is separated by a material that is non-conducting. This ring has the ends of the loop of wire attached to each side of the split-ring and the whole lot rotates together.
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