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Authoritative PPT Summary
"Magical Little Motor" Energy PPT Courseware 4
There is a small electric motor in the electric toy car, which drives the car forward.
Apply current to a small motor and observe the direction and speed of its rotation.
What's inside a small electric motor? Why does it rotate when electricity is turned on?
Take a look and think about it
When we see a coil wound around an iron core, we think of an electromagnet. How can we verify our conjecture?
Along what lines does current flow through the coil? What is the function of commutator?
The path that current flows through:
Battery → Back cover wiring → Brush → Commutator → Coil → Commutator → Brush → Back cover wiring → Battery
working principle
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.
The rotation of the small motor is the result of the work of various parts. How are these three parts put together?
The rotation of the rotor must be related to the action of force. How do magnets and electromagnets interact?
1. Install the bracket and circuit.
Place two rubber bands on the inverted cup.
Insert a wire bracket into the rubber ring and install it on the cup.
Wrap the two wires together with tape, separate the ends of one end into a "V" shape, and insert a rubber band into the other end to secure it.
Connect the wires to the battery and switch.
2. Place the rotor
Place the rotor on the stand. Adjust the position of the bracket so that the rotor can turn without sliding down. The "V" shaped fork functions as a brush.
3. Let the small motor rotor rotate.
When current is supplied to the rotor coil, does the rotor rotate? What else needs to be done to make the rotor turn?
Put a magnet close to the rotor to turn it
Where do we know electric motors are used?
An electric motor is a machine that uses electricity to generate power. Although the sizes and uses are different, the basic principles of how electric motors work are the same:
Electricity is used to generate magnetism, and the interaction of magnetism is used to rotate.
Knowledge 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.
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 ( ) an electromagnet.
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
5. The function of the commutator in a small motor is ( )
A Change the direction of current B Adjust the motor rotation speed
C switch motor
6. The electric motor is a ( ) machine.
A. Power produces magnetism B. Electricity produces power C. Magnetism produces electricity
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