"DC Motor" Magnetic Phenomenon PPT Courseware 4

Description

"DC Motor" Magnetic Phenomenon PPT Courseware 4

statement of problem

A current-carrying wire is acted upon by a force in a magnetic field, so how will a current-carrying coil move in a magnetic field?

1. Principle of DC motor

Observe and think

Experiment 1: How will a energized coil move in a magnetic field?

But when the plane of the coil is perpendicular to the magnetic field, it stops spinning...

Observed phenomena:

An energized coil _____ (can/cannot) rotate in a magnetic field; an energized coil _____ (can/cannot) continue to rotate in a magnetic field;

Think about it: Why does the coil rotate? And why doesn't it continue to rotate?

Experiment 2: Rotation of the coil inside the motor

Think about it: Why does this device allow the coil to rotate continuously? What role do the commutator and brushes play?

commutator

1. Composition: two copper semicircles;

2. Function: When the energized coil has just rotated past the equilibrium position, it can automatically change the direction of the current in the coil and make the coil continue to rotate.

An electric motor is a power machine that converts electrical energy into mechanical energy

A motor that uses direct current is called a DC motor

(The magnetic field has a powerful effect on the energized coil) The energized coil is forced to rotate in the magnetic field, which is the basic principle of the electric motor.

Description of work process

The energized coil is affected by the magnetic field force and begins to rotate clockwise. Just after the energized coil passes the equilibrium position, the commutator automatically changes the direction of the current in the coil. After the energized coil rotates through the equilibrium position, it continues to rotate clockwise under the action of the magnetic field force.

practice

1. The direction of the magnetic field's force on the current is related to the ____ direction and the ____ direction.

2. The working principle of the electric motor is __________. During the working process of the electric motor, __________ energy is converted into __________ energy.

3． The simplest commutator for a DC motor is __________. Its function is to change the direction of current flowing through ____ so that the motor can rotate continuously.

4. As shown in the figure, conduct an experiment on the force movement of a energized wire in a magnetic field and answer the following questions:

(1) Place the wire in the magnetic field, turn on the power supply, and let the current pass through the wire ab. You will find that the wire ab_______;

(2) Swap the positive and negative poles of the power supply and connect it to the circuit so that the direction of the current through the wire is opposite to the original. At this time, the wire ab_______;

(3) Keep the positive and negative poles of the power supply unchanged, and reverse the magnetic poles of the magnet so that the direction of the magnetic field is opposite to the original. At this time, the wire ab_______. From this it can be concluded that the energized wire will be acted upon by a force in the magnetic field, and the direction of the force is related to both the direction of _______ and the direction of _______.

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"DC Motor" Magnetic Phenomenon PPT Courseware 3:

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"DC Motor" Magnetic Phenomenon PPT Courseware 2:

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"DC Motor" Magnetic Phenomena PPT Courseware:

"DC Motor" Magnetic Phenomenon PPT Courseware Question: The energized wire is acted upon by a force in the magnetic field, so how will the energized coil move in the magnetic field? 1. Principles of DC Motors Observation and Thinking Experiment 1: How will a energized coil move in a magnetic field?

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Update Time: 2024-07-28

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 2 industry PPT template

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