"DC Motor" Magnetic Phenomenon PPT Courseware

Description

"DC Motor" Magnetic Phenomenon PPT Courseware

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?

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.

2. Practical electric motors

A practical DC motor consists of two parts: a stator and a rotor.

Advantages of electric motors

1. Simple structure

2. Easy to manufacture

3. Small size

4. High efficiency

5. Easy to control

6. Wide variety

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 of a DC motor is __________. Its function is to change the direction of current passing 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 a________;

(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 a________. From this, it can be concluded that the energized wire is subject to a force in the magnetic field, and the direction of the force is related to the direction of ________ and the direction of ________.

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"DC Motor" Magnetic Phenomenon PPT Courseware 4:

"DC Motor" Magnetic Phenomenon PPT Courseware 4 Question 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 operate in a magnetic field...

"DC Motor" Magnetic Phenomenon PPT Courseware 3:

"DC Motor" Magnetic Phenomenon PPT Courseware 3 Experience the Principle of DC Motor Activity: Prepare two batteries, a section of enameled wire, magnets, and wire supports. Activity 1: As shown in the picture, wind the enameled wire into a rectangular coil, scrape off all the paint layers on both ends of the enameled wire, and press...

"DC Motor" Magnetic Phenomenon PPT Courseware 2:

"DC Motor" Magnetic Phenomenon PPT Courseware 2 I would like to discuss what exists around the magnet? Magnetic Fields What exists around a straight conductor carrying electricity? Magnets interact with each other through magnetic fields. Will current-carrying wires also be affected by magnetic fields? 1. The effect of magnetic field on current-carrying wires..

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Update Time: 2024-10-06

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

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