"Electromagnet Relay and Automatic Control" Electromagnet and Automatic Control PPT Courseware

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"Electromagnet Relay and Automatic Control" Electromagnet and Automatic Control PPT Courseware

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1. What parts does an electromagnet consist of?

coil, iron core

2. What factors are related to the magnetic strength of electromagnets?

Number of coil turns and current size

3. List the application examples of electromagnets.

Electromagnetic cranes, electric bells, maglev trains, electromagnetic relays….

1. Understanding electromagnetic relays

The structure and function of electromagnetic relay

The function of the main parts:

Electromagnet: When energized, it generates magnetism and attracts the armature.

Armature: and the movable contact form a lever that rotates around the fulcrum, driving the movable contact to move up and down.

Return spring: When the magnetism of the electromagnet disappears, it pulls the armature and bounces away from the electromagnet.

Contact: equivalent to the switch of the controlled circuit (A and C are static contacts, B is a moving contact)

2. Use electromagnetic relays for automatic control

Activity 2: Learn to use electromagnetic relays

working principle

When the switch S1 is closed, the electromagnet is energized to produce ____, which moves the armature ______ and the movable contact downwards, the ____ branch is connected, and ____ lights up; when the switch S1 is open, the electromagnet loses power and loses ____, The return spring pulls the armature, the movable contact moves upward, the ____ branch is connected, and ____ lights up;

When switch S1 is closed, the electromagnet is energized to produce ____, which ______ the armature and the contact of switch S. When _____ passes through the working circuit, the motor starts to rotate.

think:

1. If the motor in the working circuit in the above example is a large motor with a working voltage of several thousand volts or even higher, it would be dangerous to control it directly with a switch. This danger can be avoided by using an electromagnetic relay. So what do you think are the benefits of using an electromagnetic relay? What?

Electromagnetic relays can be used to control high voltage and high current circuits with low voltage and weak current circuits.

2. Think about it: What other benefits can be achieved by using electromagnetic relays?

Remote operation, automatic control

Class summary

1. The electromagnetic relay is composed of _______, _______, ______ and ______.

2. The electromagnetic relay can be used to realize the working circuit of _______ and _______ controlled by low voltage and weak current, and it can also realize _______ and ________.

Class exercises

1. The structure of the electromagnetic relay is as shown in the figure, where A is ________, B is ________, and C is ________. It uses ________ to absorb and release the armature instead of opening the armature.

Turn off the control circuit

On and off.

2. The main advantages of using electromagnetic relays to control high voltage and high current switches are ( )

A. Save electricity B. Use electricity safely

C. Protect electrical appliances D. Simple operation

3. Regarding the selection of the armature of the electromagnetic relay, which of the following statements is correct ( )

A. Soft iron material should be used

B. Steel rods should be used

C. Both of the above materials can be used

D. Neither of the above two materials will work

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For more information about the PPT courseware "Electromagnets and Automatic Control Electromagnetic Relays and Automatic Control", please click the Electromagnets and Automatic Control ppt Electromagnetic Relays and Automatic Control ppt tag.

"Electromagnetic Relays and Automatic Control" Electromagnets and Automatic Control PPT Courseware 2:

"Electromagnetic Relays and Automatic Control" Electromagnets and Automatic Control PPT Courseware 2 1. Understand electromagnetic relays. Please write the Chinese names of each component in the corresponding positions on the picture. Activity 1 Observe the functions of the main parts of the electromagnetic relay: Electromagnet: generated when energized magnetic,..

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Update Time: 2024-11-17

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 2 industry PPT template

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