JPH08126106A - Inductive power supply device for mobile - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the power supply efficiency of an induction power supply device that supplies power to a moving body from the ground side in a contactless manner by using the principle of electromagnetic induction using primary and secondary inductors. [Structure] The secondary inductor 4 that is opposed to the primary inductor 1 on the ground in a non-contact manner has a structure in which a secondary coil 6 is wound around an iron core 5 arranged concentrically with a wheel 7 of a vehicle A. Place it inside. If this is the case, the secondary inductor 4
Is brought as close as possible to the primary inductor 1, the secondary inductor 4 does not come into contact with the road surface, and the primary coil 3
And the distance between the secondary coils 6 can be shortened to improve the power feeding efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductive power supply device for a mobile body, which supplies electric power from a primary side inductor on the ground to a secondary side inductor mounted on the mobile body in a non-contact manner. Specifically, it is a proposal to improve power supply efficiency.

[0002]

2. Description of the Related Art A primary side inductor is laid on the ground along a moving route of a moving body, for example, a vehicle, and an AC current is passed through a coil of the primary side inductor to mount the inductor on the vehicle to be a primary side ink inductor. BACKGROUND ART An induction power supply device in which electric power is induced in a coil of a secondary inductor facing each other by a principle of electromagnetic induction to supply power to a vehicle in a contactless manner is already well known.

The secondary inductor of this device is attached to the bottom of the vehicle body while maintaining a distance between the secondary inductor and the road surface that avoids contact with the road surface.

[0004]

A general vehicle has a suspension device for the wheels and a buffer device for supporting the vehicle body, and the sinking of the vehicle body increases as the loaded weight increases. Those using wheels with tires have a particularly large amount of sinking. Therefore, the secondary inductor provided at the bottom of the vehicle body is
Naturally, the distance to the road surface is determined based on the maximum sinking amount of the vehicle body, but with this, the distance to the road surface becomes large when the vehicle is empty, and the magnetic flux coupling state between the primary coil and the secondary coil is poor. The power supply efficiency is reduced.

If the distance between the secondary inductor and the road surface is large from the beginning, the same result can be obtained even if the car body does not sink.

In view of the above, the present invention provides an induction power supply device which eliminates the risk of the secondary side inductor contacting the road surface and shortens the distance between the secondary side inductor and the primary side inductor as much as possible, thereby improving the power supply efficiency. The challenge is to provide.

[0007]

In order to solve the above problems, in the present invention, the secondary inductor has a structure in which a secondary coil is wound around an iron core arranged concentrically with a wheel of a moving body. Make it built into the wheel.

[0008]

If the secondary inductor is built into the wheel, the rubber layer and the air layer of the wheel are interposed between the secondary inductor and the road surface, so that the secondary inductor does not come into contact with the road surface. Also,
If the secondary inductor is placed in the wheel that is originally grounded, the distance between it and the primary inductor can be greatly shortened.
This improves the magnetic flux coupling between the primary coil and the secondary coil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the inductive power feeding device of the present invention. In the figure, reference numeral 1 is a primary inductor formed by winding a primary coil 3 around an iron core 2, and 4 is a secondary inductor formed by winding a secondary coil 6 around an iron core 5.

The primary side inductor 1 is laid on the ground along the moving path of the vehicle A, and the secondary side inductor 2 is built in the wheel 7. The illustrated wheel has a tubeless tire, and has an air chamber 8 inside.

In the secondary inductor 2, the iron core 5 is an annular iron core that is concentric with the wheel, and a secondary coil wound around the iron core 5 is fixed to the rim 9 of the wheel with a non-magnetic support 10 and the inside of the air chamber 8 is fixed. It is located at.

The electric power induced in the secondary coil 6 is
It is sent to an electric circuit or a motor on the vehicle through a rotary joint (not shown) or the like.

With this structure, the secondary inductor 4 can be brought close to the primary inductor 1 within a range that does not hinder the deformation of the tire.

If the secondary inductor 4 comes too close to the primary inductor 1, the inner surface of the crown portion may come into contact with the coil of the primary inductor when the tire gets over an obstacle. Since the primary-side inductor rotates integrally, unlike the case where it contacts the road surface that flows at high speed, the risk of coil damage is low.

If the wheels are rubber-filled wheels, 2
The secondary inductor is embedded in rubber.

[0016]

As described above, in the inductive power feeding device of the present invention, the secondary side inductor is built in the wheel of the moving body and brought sufficiently close to the primary side inductor without causing contact with the road surface. Since it is possible, the effect that the magnetic flux coupling between the primary and secondary coils is strengthened and the power feeding efficiency is enhanced can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a power supply device of the present invention.

[Explanation of symbols]

 1 primary side inductor 2 iron core 3 primary coil 4 secondary side inductor 5 iron core 6 secondary coil 7 wheel 8 air chamber 9 rim 10 supporter

Claims (1)

[Claims] 1. A primary side inductor that is laid on the ground along a moving path of a moving body, and a secondary side inductor that is mounted on the moving body. In an inductive power feeding device for a mobile body, which generates an induced current in a coil of a secondary inductor and transmits electric power between a primary inductor and a secondary inductor in a non-contact manner, the secondary inductor is placed concentrically with a wheel of the movable body. An induction power supply device for a mobile body, characterized in that a secondary coil is wound around an arranged iron core and is built into a wheel.