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
①The coil of a receiving side is brought close the power transmission side.
↓
②Electric 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.
↓
③An 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.
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
