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Authoritative PPT Summary
"Magic Little Motor" Energy PPT Courseware 3
Have you ever played with these electric toys?
What drives them forward?
Is the rotor an electromagnet?
By applying power to the coil from the commutator, you can see that the rotor core can pick up the pins.
Explain that the rotor is just three electromagnets.
The function of commutator
The purpose of the commutator is to switch on the current and change the direction of the current.
During the rotation of the small motor, the brushes contact the three metal rings of the commutator in sequence, and the direction of the current passing through the rotor coil will automatically change.
Explore changing the rotation state of the rotor of a small motor
1. If the distance of the magnet is changed, what will happen to the rotation of the rotor?
2. If the positive and negative terminal connections of the battery are changed, what will happen to the rotation of the rotor?
3. If the position of the north and south poles of the magnet is changed, what will happen to the rotation of the rotor?
comminicate
1. What can be done to make the rotor rotate?
Apply electricity to the coil to generate magnetism; then put a magnet close to the rotor, and the rotor will rotate.
2. What can be done to make the rotor rotate faster?
The closer the magnet is to the rotor, the faster the rotor turns.
3. What can be done to change the rotation direction of the rotor?
Changing the position of the north and south poles of the magnet, or changing the positive and negative pole connections of the battery, can change the rotation direction of the rotor.
Class summary
1. The rotor is actually an electromagnet.
2. The function of the small toy motor is to turn electricity into power.
3. The interaction between the magnet and the electromagnet drives the rotor to rotate.
Classroom testing
1. True or False Questions (mark √ if correct, × if incorrect)
1. There are magnets inside the motor. ( )
2. Changing the current cannot change the speed of the rotor rotation. ( )
3. Electric motors use electricity to work. ( )
4. The rotor of a small motor is equivalent to an electromagnet, which becomes magnetic after being energized. ( )
5. There are only two sets of coils on the rotor of a small motor. ( )
2. Multiple choice questions
1. The rotor is composed of iron core, coil and ( ).
A. Brush B. Commutator C. Shell
2. The rotor is equivalent to ( ) electromagnets.
A.1 B.3 C.4
3. What can speed up the rotation speed of the rotor of a small motor is ( ).
A. Use two magnets B. Reduce the number of turns of the coil
C. Reduce the number of batteries
4. The rotation direction of the small motor has nothing to do with ( ).
A. Change the direction of the current B. Change the magnetic poles of the rotor magnet
C. Increase the number of turns of the coil winding
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