The system of an electromagnetic induction

An electromagnetic induction type is a kind of the system of wireless electric supply.

In the technology put in practical use, it is main a system.

This system uses the guidance magnetic flux which occurs in a receiving side and the power transmission side.

It enables electric power power transmission.

The efficiency of electric transmission is greatly related to the distance between a receiving side and a power transmission side.

Therefore, when supplying electric power with small coils, electric power cannot be transmitted unless it is a short distance.

Principle

This system supplies electric power using electromagnetic induction.

Current occurs in a circuit by change of a magnetic field.
The phenomenon is applied.


A coil is required for the power transmission side.
Receiving side too.
Electric current flows into the coil on the power transmission side.

Magnetic flux occurs in the coil of a receiving side and in the coil of a power transmission side.

The magnetic flux in the coil of a receiving side changes.

When the magnetic field in a coil changes, electric current flows into the coil of a receiving side.

Principle2

@The coil of a receiving side is brought close the power transmission side.
      
           ↓

AElectric current flows into the power transmission side.


Magnetic flux occurs in the coil of a receiving side and in the coil of a power transmission side.
         
           ↓

BAn induced current arises in a receiving side.
   
      


Efficiency

Unless this feeding method is a short distance, it does not act.

By using iron and copper, apparatus will become heavy.
Furthermore, it generates heat.

Efficiency falls by gap of the position of a coil.

Now, efficiency is rising to about 70 percent by uniting the frequency of a coil.

Experiment

Experiment:The induced current which occurs by changing the magnetic field in a coil is observed.
Tool:Coil.Ammeter.Magnet.

An animation is reproduced by click.

クリックで動画再生
Result:Change of the magnetic field in a coil makes a coil generate current.

It was proved that change of a magnetic field produces an induced current.

In the electromagnetic induction type, electric power is supplied using the mechanism of this induced current generating.

Advantages

●Do not rust.
●Waterproofing is possible.
●Charge is possible also in a situation with water.
●Can charge by only placing.




【Reference】

TDK Techno Magazine

非接触電力輸送-wikipedia






 

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