JPS5823723B2 - Contactless power supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new power supply device intended for supplying power to mobile equipment and machine tools that frequently change their installation locations.

Conventionally, there are two methods for this type of power supply: one using a long power cord and one using a trolley.
The present invention seeks to provide a new power supply device that uses a transformer.

That is, the present invention includes a primary winding wound into an elongated loop for supplying high-frequency alternating current, the primary winding being housed in a slot of a primary core, and the primary winding being housed in a slot of a secondary core. It consists of a splittable moving core containing a loop-shaped secondary winding facing a primary winding, and the power is transmitted to the secondary winding by energizing the primary winding. The following is an explanation of the embodiment based on the drawings.

FIG. 1 is an exploded perspective view of an embodiment of the present invention, in which 1 is a primary winding connected to an AC power source E and wound in an elongated loop;
Reference numeral 2 indicates two slots) 2a, in which the primary winding 1 is loosely fitted, and 3 indicates the same shape as the primary core 2; This is a secondary moving core equipped with a loop-shaped secondary winding 4 facing the next winding.

In order to reduce the size and weight, a high frequency inverter was used as the AC power source E, and the winding wire was a thin stranded wire wound with 2 to 3 turns in order to reduce the skin effect caused by high frequencies.

As for the material of the moving cores 2 and 3, silicon steel is used when the operating frequency is relatively low, about 2 KHz, and when a high frequency power source of about 20 KHz, which is in the ultrasonic range, is used to prevent noise, iron loss due to high frequency is used. Use an amorphous magnetic material such as a ferrite core or amorphous material with a small amount of ferrite core.

For example, when the object to be supplied with power is a machine tool, the device of the present invention can be used by
The secondary moving core 3 is fixed to the machine tool, and the primary moving core 2 is attracted to the secondary moving core 3 (attracted by magnetic force while energized) or fixed together with an appropriate means. .

In this way, power can be supplied to the moving machine tool without contact.

The volume of the moving core composed of 2 and 3 in the present invention is expressed by the following equation, where P is the power, f is the frequency, B is the magnetic flux density, δ is the current density, and θ is the cooling capacity coefficient.

Therefore, if there is a size limit, the moving core can be made smaller and lighter by using a high frequency power source.

Unfortunately, the key to transmission performance is to reduce the voltage fluctuation rate ε, so if you design the magnetic loading to be large and the electrical loading to be small, you can obtain a contactless power supply device with good transmission performance.

Figure 2 shows an equivalent circuit of the moving core transformer according to the present invention, in which 11 and 12 are the magnetic path lengths of the primary and secondary moving cores 2 and 3, and M is the mutual inductance. It is.

For reference, etc. 11, 12. The formula for M is as follows.

However, L2 cable length (primary winding length) d: cable width μS: relative permeability A): vacuum permeability lf slot length H slot depth W slot width le = coil end length γ: Radius of conductor wire FIG. 3 shows an embodiment in the case of three phases, and a movable core having three slots may be used.

Note that the drawings of the embodiments do not show the secondary side.

All of the examples shown here are of external iron type, but
It is obvious that the inner iron type may also be used.

As can be easily understood from the above explanation, it is a power supply device that uses a mobile transformer, and by using a high-frequency power supply, the mobile core can be made compact, and by using a divided mobile core, it can simultaneously handle a large number of mobile devices. It has the feature of being able to supply power to
As a practical new power supply method, its industrial value is extremely low.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is an equivalent circuit diagram, and FIG. 3 is a perspective view of a different embodiment. E: AC power supply, 1: Primary winding,
2...Primary side moving core, 3...Secondary side moving core, 4...Secondary side winding.

Claims (1)

[Claims] 1. A primary winding wound in a long and narrow loop shape that supplies high-frequency alternating current, this primary winding is housed in a primary core slot, and the primary winding is housed in a slot of a secondary core. It is characterized by comprising a splittable movable core housing a loop-shaped secondary winding facing the winding, and transmitting power to the secondary winding by energizing the primary winding. Contactless power supply device.