"Electric Motor" Electromagnetic Phenomenon PPT Courseware 2

Description

"Electric Motor" Electromagnetic Phenomenon PPT Courseware 2

Want to discuss

What exists around a magnet?

What exists around a straight conductor carrying electricity?

Magnets interact with each other through magnetic fields

Will the current-carrying wire also be affected by the magnetic field?

1. The effect of magnetic field on current-carrying wires

Demonstration experiment

① Close the switch and observe the movement of the aluminum straight conductor.

② Change the direction of current or change the direction of magnetic field.

When the plane of the coil is perpendicular to the magnetic field, the energized coil is acted upon by a balancing force and reaches an equilibrium position. At this time, the coil will continue to rotate due to inertia.

1. A current-carrying wire experiences a force in a magnetic field.

2. The direction in which a current-carrying straight wire experiences a force in a magnetic field is related to the direction of the current and the direction of the magnetic field.

question

The straight wire in the experiment will leave the magnetic field after moving for a certain distance, making it difficult to move continuously. So can the coil rotate continuously?

2. Basic structure of electric motor

1. The electric motor consists of two parts:

A coil that can rotate is also called a rotor.

A fixed magnet is also called a stator.

think about it

If in the second half of the coil's rotation, instead of stopping the power supply to the coil, we try to change the direction of the current in the second half of the rotation so that the coil also gets power in the second half of the rotation, wouldn't the coil rotate more smoothly?

summary:

1. A current-carrying conductor will experience a force in a magnetic field

2. The direction of force exerted by a current-carrying conductor in a magnetic field is related to the direction of the current and the direction of the magnetic field.

3. The principle of electric motor is: ______________

4. The function of the commutator is to automatically change the direction of the current in the coil when the coil crosses the equilibrium position.

5. Structure of electric motor: rotor and stator

6. Application of electric motors in life: electric bicycles, electric cars, electric toys

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For more information about the "Electromagnetic Phenomenon of Electric Motors" PPT courseware, please click the "Electromagnetic Phenomenon of Electric Motors ppt" tab.

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Update Time: 2024-06-30

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 2 industry PPT template

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