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Authoritative PPT Summary
"Electric Motor" PPT
Part One: Oersted's Experiment
Oersted's experiment: It shows that there is a magnetic field around a current-carrying conductor, which has a magnetic effect on the magnet.
Reverse thinking - can a magnet move a current-carrying wire?
Conclusion: A current-carrying conductor will be affected by a force in a magnetic field, and the direction of the force is related to the direction of the current and the direction of the magnetic field lines.
Electric motor PPT, part 2: basic structure of electric motor
The principle of the electric motor: the energized wire (coil) is acted upon by a force in the magnetic field
The main structure of the electric motor:
1.Stator
2.Rotor
So how does the coil of the motor achieve continuous rotation?
How commutator works
When the coil turns to the other half and contacts the brush, the direction of the current changes, so the direction of the force changes and the coil continues to turn.
Electric Motor PPT, Part 3: Electric Motors in Life
Motor type:
AC motor
DC motor
When the motor is powered on, the rotor rotates, converting electrical energy into kinetic energy.
Since the power grid supplies AC power, most of the motors in household appliances such as electric fans and washing machines are AC motors.
Most small appliances such as electric toys and tape recorders are powered by batteries and have DC motors inside.
advantage:
Simple structure, convenient control, small size,
High efficiency, large or small power, no pollution
With this advantage, electric motors are widely used in life and production.
The water pumps in rural electric irrigation stations and various machine tools in factories all have electric motors. Electric vehicles and electric locomotives are both means of transportation powered by electric motors. Research on electric vehicles powered by solar energy or batteries has entered the experimental stage. With the development of technology and social progress, the relationship between electric motors and humans will become increasingly close.
Electric motor PPT, part 4 content: Summary:
Motor energy conversion: electrical energy → kinetic energy
Classification:
DC motor (electric toys, tape recorders, etc.)
AC motors (electric fans, washing machines, etc.)
Advantages of electric motors:
Simple structure, convenient control, small size, high efficiency and no pollution
Keywords: Free download of Zhejiang Education Edition science PPT courseware for eighth grade volume 2, electric motor PPT download, .PPT format;
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