I 1111111111111111 11111 1111111111 11111 111111111111111 IIIII IIIIII IIII IIII IIII
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`US007804272B2
`
`c12) United States Patent
`Morita et al.
`
`(IO) Patent No.:
`(45) Date of Patent:
`
`US 7,804,272 B2
`Sep.28,2010
`
`(54) NON-CONTACT TYPE POWER FEEDER
`SYSTEM FOR MOBILE OBJECT AND
`PROTECTING APPARATUS THEREOF
`
`(75)
`
`Inventors: Katsuaki Morita, Hiroshima-ken (JP);
`Masaya Mitake, Hiroshima-ken (JP);
`Masahiro Yamaguchi, Hiroshima-ken
`(JP); Masaomi Yamada, Hiroshima-ken
`(JP); Hiroshi Yamashita, Hiroshima-ken
`(JP); Kousuke Katahira, Hiroshima-ken
`(JP)
`
`(73) Assignee: Mitsubishi Heavy Industries, Ltd.,
`Tokyo (JP)
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 455 days.
`
`(21) Appl. No.: 11/936,916
`
`(22) Filed:
`
`Nov. 8, 2007
`
`(65)
`
`Prior Publication Data
`
`US 2008/0129246 Al
`
`Jun. 5,2008
`
`(30)
`
`Foreign Application Priority Data
`
`Nov. 10, 2006
`
`(JP)
`
`............................. 2006-306052
`
`(51)
`
`Int. Cl.
`(2006.01)
`HOJM 10146
`320/108
`(52) U.S. Cl. ......................................................
`(58) Field of Classification Search ................. 320/107,
`320/108, 109; 310/12.01, 12.02, 12.09; 104/282,
`104/292; 290/16, 50
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`7,495,414 B2 * 2/2009 Hui ............................
`
`320/108
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`JP
`JP
`JP
`
`2000150273 A
`2003115415 A
`2005224045 A
`2006128397 A
`
`5/2000
`4/2003
`8/2005
`5/2006
`
`* cited by examiner
`
`Primary Examiner-Edward Tso
`(74) Attorney, Agent, or Firm-Lowe Haupman Ham &
`BemerLLP
`
`(57)
`
`ABSTRACT
`
`A noncontact type power feeder system for feeding a power to
`a mobile object, in which a power feeding portion and a power
`receiving portion can be easily manufactured at low costs and
`which can transmit a high power. The noncontact type power
`feeder system for a mobile object, comprises a power feeding
`portion provided in a surface on which the mobile object runs,
`and a power receiving portion provided in the lower part of the
`mobile object at a position facing to the power supply portion,
`the each of the power feeding portion and the power receiving
`portion is composed of windings formed in an oval shape, and
`a magnetic planar core formed therein with a recess in which
`the windings are accommodated so that the longitudinal
`direction of the oval shape of the windings is extended along
`the travel direction of the mobile object, the planer core is
`composed of several planar blocks each having a rectangular
`surface, several blocks being laid so that long sides of the
`rectangular surfaces are extended in the travel direction of the
`mobile object, in which several blocks are also laid in the
`direction orthogonal to the travel direction, and several blocks
`being superposed one upon another, the recess of the planar
`core is defined by thick wall parts in which the planar cores
`are superposed on the surface of the planar core, outside and
`inside of the oval shape part of the windings.
`
`9 Claims, 12 Drawing Sheets
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`Momentum Dynamics Corporation
`Exhibit 1024
`Page 001
`
`

`

`U.S. Patent
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`Sep.28,2010
`
`Sheet 1 of 12
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`US 7,804,272 B2
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`Momentum Dynamics Corporation
`Exhibit 1024
`Page 002
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`

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`U.S. Patent
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`Sep.28,2010
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`Sheet 2 of 12
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`US 7,804,272 B2
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`Momentum Dynamics Corporation
`Exhibit 1024
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`U.S. Patent
`
`Sep.28,2010
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`Sheet 4 of 12
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`US 7,804,272 B2
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`Momentum Dynamics Corporation
`Exhibit 1024
`Page 005
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`

`

`U.S. Patent
`
`Sep.28,2010
`
`Sheet 5 of 12
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`US 7,804,272 B2
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`Fig.5
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`Momentum Dynamics Corporation
`Exhibit 1024
`Page 006
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`

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`U.S. Patent
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`Sep.28,2010
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`Sep.28,2010
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`U.S. Patent
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`Sep.28,2010
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`U.S. Patent
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`Sep.28,2010
`
`Sheet 9 of 12
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`US 7,804,272 B2
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`U.S. Patent
`
`Sep.28,2010
`
`Sheet 12 of 12
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`Exhibit 1024
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`

`

`US 7,804,272 B2
`
`1
`NON-CONTACT TYPE POWER FEEDER
`SYSTEM FOR MOBILE OBJECT AND
`PROTECTING APPARATUS THEREOF
`
`RELATED APPLICATIONS
`
`The present application is based on, and claims priority
`from, Japanese Application Number 2006-306052, filed Nov.
`10, 2006, the disclosure of which is hereby incorporated by
`reference herein in its entirety.
`
`BACKGROUND OF THE INVENTION
`
`2
`meter, the inductance thereof would vary largely so as to be
`largely out of a resonance condition, and accordingly, No
`higher power can be transmitted effectively. Thus, this power
`feeder system cannot transmit a large power in this configu(cid:173)
`ration as it is.
`The transformer for noncontact type power feeder system,
`disclosed in cited reference 2, is capable of transmitting a
`relatively high power, having an annular core formed of sec(cid:173)
`tor-like blocks which are jointed to one another. However, it is
`10 difficult to form blocks having the sector-like shape, and
`accordingly, there is caused a problem of taking much time
`and labor for the manufacture thereof. Further, the core hav(cid:173)
`ing a disc-like shape, and composed of several unit blocks
`having a U-like transverse-sectional shape, which are stacked
`15 one upon another and jointed to one another, causes much
`time and labor for manufacturing several unit blocks, and
`further, there is a risk of presence of gaps between adjacent
`unit blocks arranged in an arcuate shape, resulting in an
`problem of reducing a transmittable power per unit area
`20 caused by lowering of inductance due to a decrease in an area
`occupied by the core.
`Further, since the shape of the core is armular, the winding
`width of the windings cannot be taken largely, resulting in
`decrease in magnetic coupling rate, and a large radius is
`25 required for transmission of a high power, and accordingly,
`there is caused a problem of lowering design flexibility.
`
`1. Field of the Invention
`A present invention relates to a power feeder system for
`feeding a power to a power receiving portion provided to a
`mobile object such as an electric vehicle in a track way type
`transportation system or an electric mobile, from a power
`feeding portion provided in a track way, a road surface or the
`like on which the mobile object runs.
`2. Description of the Related Art
`A noncontact type power feeder system is adapted to feed
`a power in a noncontact marmer from a power feeding portion
`to a power receiving portion which are opposed face-to-face
`to each other through a gap therebetween, with the use of
`electromagnetic induction. The power feeding portion and
`the power receiving portion are provided therein with cores
`made of magnetic material such as ferrite. An E-shape core as
`an example thereof, has a plurality of protrusions and a plu(cid:173)
`rality of recesses which are defined between the adjacent 30
`protrusions, and windings annularly runs around among the
`plurality of recesses.
`Patent Document 1 (Japanese Patent Laid-Open No. 2006-
`128397) discloses a power feeder system for feeding a power
`in a noncontact manner to a shopping cart or the like. E-type 35
`cores made of ferrite are used in a power feeding portion and
`a power receiving portion in this power feeder system, and
`windings are arranged at levels equal to the heights of pro(cid:173)
`trusions of the cores in both power feeding and receiving
`portions so as to minimize the inter distance between the 40
`windings in the power feeding portion and the windings in the
`power receiving portion in order to reduce leakage flux from
`the power feeding portion and as well to enhance the trans(cid:173)
`mission efficiency from the windings on the power feeding
`portion side to the windings on the power receiving portion 45
`side.
`Patent Document 2 (Japanese Patent Laid-Open No. 2000-
`150273) discloses a transformer for a noncontact type power
`feeder system having armular cores in a power feeding por(cid:173)
`tion and a power receiving portion in order to enable trans-
`mission of a high power. The annular cores which are made of
`ferrite are formed in either a process in which a plurality of
`sector-like blocks are coupled to one another so as to form a
`single disc-like shape or a process in which several unit
`blocks having a U-like transverse sectional shape are stacked 55
`one upon another and coupled to one another so as to form a
`disc- like shape.
`The noncontact type power feeder system disclosed in
`patent document 1 is adapted to be used for a relatively low
`power transmission for a display unit in the shopping cart or 60
`the like, but is not intended for transmission of a high power
`of not lower than about several ten kW. The gap between the
`power feeding portion and the power receiving portion is
`regulated so as to maintain a small value, that is, about 2 mm
`in order to increase its magnetic coupling rate (a ratio of an 65
`effective magnetic flux with respect to an overall magnetic
`flux). Should the gap be deviated within an about one milli-
`
`50
`
`SUMMARY OF THE INVENTION
`
`Thus, the present invention is devised in view of the above(cid:173)
`mentioned background, and accordingly, an object of the
`present invention is to provide a noncontact type power feeder
`system for feeding a power to a mobile object, which can
`facilitate the manufacture of a power feeding portion and a
`power receiving portion at low costs, and which can enhance
`the magnetic coupling rate.
`Further, another object of the present invention is to pro(cid:173)
`vide a noncontact type power feeder system which can
`increase an inductance so as to be capable of transmitting a
`high power.
`To the end, according to the present invention, there is
`provided a noncontact type power feeder system for a mobile
`object, composed of a power feeding portion provided along
`a track way for the mobile object, and a power receiving
`portion provided in the mobile object, the power feeding
`portion and the power receiving portion being opposed face(cid:173)
`to-face to each other so as to carry out power feed, wherein
`each of the power feeding portion and the power receiving
`portion is composed of windings formed in an oval shape, and
`a magnetic planar core having a surface formed therein with
`a recess in which the windings are accommodated, wherein
`the planar core is formed of an assembly of planar blocks
`each having a rectangular surface, the assembly of planar
`blocks having thin wall parts in which planar blocks are laid
`in one and the same plane with their long sides are adjacent to
`one another, and thick wall parts in which planar blocks are
`superposed one upon another, the recess of the planar core is
`defined by the thick wall parts in which planar blocks are
`superposed on the surface of the planar core on the inside and
`the outside of the oval shape of the windings, and the longi(cid:173)
`tudinal direction of the oval shape of windings and the long
`sides of the planar blocks are directed in a travel direction of
`the mobile object when the power feeding portion and the
`power receiving portion are opposed face-to-face to each
`other.
`In the present invention, both power feeding portion and
`power receiving portion substantially have one and the same
`
`Momentum Dynamics Corporation
`Exhibit 1024
`Page 014
`
`

`

`US 7,804,272 B2
`
`3
`configuration. The power feeding portion is provided along
`the track way while the power receiving portion is provided in
`the mobile object, and when the mobile object comes to a stop
`in a power feeding place, the power receiving portion and the
`power receiving portion are arranged so that their winding
`laying surfaces are opposed faced-to-face to each other with
`a predetermined gap therebetween in order to feed a power to
`the mobile object.
`When an a.c. current is fed to a primary winding of the
`power feeding portion in such a condition that the power
`feeding portion and the power receiving portion are opposed
`to face-to-face each other, a magnetic flux is generated with a
`main magnetic path which extends through the power feeding
`portion, the power receiving portion and the gap between the
`power feeding portion and the power receiving portion.
`An overall magnetic flux is the sum of an effective mag(cid:173)
`netic flux interlinking a secondary winding of the power
`receiving portion, and a leakage magnetic flux which does not
`interlink the secondary winding. Since the magnetic flux
`interlinking the secondary winding changes with time, an 20
`induced electric motive force is produced in the secondary
`winding due to electromagnetic induction, and accordingly,
`an a.c. current runs so that a power is transmitted to a load
`connected to the secondary winding.
`In the present invention, the planar core which constitutes 25
`the power feeding portion or the power receiving portion is
`formed of an assembly of planer blocks each having a rect(cid:173)
`angular surface, the assembly of planar blocks being com(cid:173)
`posed of thin wall parts in which planar blocks are arranged in
`one and the same plane with their long sides being made into 30
`contact with one another, and thick wall parts in which planar
`blocks are superposed one upon another, the recess in the
`planar core being defined by the thick wall parts in which the
`planar blocks are superposed on the surface of the planar core
`on the inside and the outside of the oval part of the windings, 35
`and when the power feeding portion and the power receiving
`portion are opposed face-to-face to each other, the longitudi(cid:173)
`nal direction of the oval part of the windings and the long
`sides of the planar blocks are directed in the travel direction of
`the mobile object.
`Thus, the surface of the planar core can be formed in a
`rectangular shape, having its long sides extending in the travel
`direction with no difficulty. Further, by changing the arrange(cid:173)
`ment of the planar blocks, the shape of the core may easily be
`changed into a desired shape. Further, with the combination 45
`of the above-mentioned planar blocks, a planer core having a
`simple shape can be manufactured at lower costs.
`The windings are accommodated in the recess formed in
`the surface of the planar core. Further, the planar blocks may
`be joined to one another with the use of adhesives and screws. 50
`Further, in such a case that the power feeding portion is
`provided in the surface of the track way while the power
`receiving portion is provided in the mobile object, the power
`feeding portion and the power receiving portion are accom(cid:173)
`modated respectively in protecting apparatuses serving as 55
`means for protecting the power feeding portion and the power
`receiving portion from the external environment. The protect(cid:173)
`ing apparatus will be described later.
`In the power feeder system according to the present inven(cid:173)
`tion, the power feeding portion or the power receiving portion 60
`may be secured to the surface of the track way for the mobile
`object, or the mobile object, or it may be attached to the
`surface of the track way or the mobile object so as to be
`movable, relative to the surface of the track way or the mobile
`object. Even in either of these cases, when the power feeding 65
`portion and the power receiving portion are opposed face-to(cid:173)
`face to each other, the longitudinal direction of the oval shape
`
`4
`of the windings and the long sides of the planar blocks are
`directed in the travel direction of the mobile object. Accord(cid:173)
`ingly, a large-size planar core having long sides in the travel
`direction can be easily formed, and accordingly, a noncontact
`type power feeder system composes of the above-mentioned
`planer core, can ensure an excellent design flexibility with
`respect to the transmission of a high power by decreasing the
`overall width of the planar core as possible as it can, and by
`adjusting the length thereof in the travel direction of the
`10 mobile object.
`In the present invention as stated above, a large size core
`can be easily manufactured, and accordingly, the gap between
`the power feeding portion and the power receiving portion
`can become larger, that is, the gap can be set to a value, for
`15 example, in a range from about several millimeters to several
`ten millimeters.
`In the present invention, preferably, with the provision of
`U-like cross-sectional shape parts for supporting opposite
`ends of the windings in the longitudinal direction of the oval
`shape thereof, to the planar core, the windings may be sup(cid:173)
`ported by the planar core over the entire periphery thereof. In
`this configuration, by arranging the core having a U-like
`cross-section in the magnetic path in the form of an air space,
`the overall magnetic resistance becomes lower while the
`inductance becomes higher. Thus, the magnetic flux density
`on the inside of the windings becomes larger. Further, the
`sectional area of the planer core located outside of the recess
`in which the windings are accommodated, can be larger, and
`accordingly, the density of magnetic flux outside the wind(cid:173)
`ings can be set to be smaller. Thus, the density of magnetic
`flux leaking at the periphery of the core can be less, thereby it
`is possible to reduce affection by magnetic noise and induc(cid:173)
`tion heating through a metal around the windings. Further,
`since the U-like sectional shape parts are present at both ends
`of the planar core in the longitudinal direction of the oval
`shape of the windings, the magnetic flux can be easily pro-
`duced, thereby it is possible to have a higher inductance and
`to transmit a higher power.
`Further, according to the present invention, if the opening
`40 width of the recess in which the windings are accommodated
`is set to be equal to or larger than the gap between the power
`feeding portion and the power receiving portion, the magnetic
`resistance of the magnetic path through which leakage mag-
`netic flux produces, can be set to be higher, thereby it is
`possible to enhance the magnetic coupling rate and therefore
`to transmit a higher power.
`Moreover, according to the present invention, by setting
`the length of the power feeding portion along the travel direc(cid:173)
`tion of the mobile object, to be longer than the power receiv(cid:173)
`ing portion along the travel direction, the robustness for the
`power receiving capacity can be enhanced, with respect to a
`positional deviation of the stopping position of the mobile
`object in a horizontal direction. Further, it is not required to
`make longer the planar core in the power receiving portion
`which is installed on the mobile object side and for which
`robustness, lightweight and compactness are required, that is,
`by setting the planar core to be sorter, the lightweight and the
`compactness can be achieved.
`It is noted, according to the present invention, that by
`feeding a high frequency current of about several KHz to
`several ten KHz to the power feeding portion, the sectional
`area of the core can be set to be small in comparison with
`another core to which an equal power is fed, and accordingly,
`it is possible to miniaturize the system since the inductive
`electromotive force is proportional to a frequency. Moreover,
`it is preferable to use, for the windings, litz wires which can
`restrain an increase in resistance and an increase in heating
`
`Momentum Dynamics Corporation
`Exhibit 1024
`Page 015
`
`

`

`US 7,804,272 B2
`
`6
`safely protect the power feeding portion or the power receiv(cid:173)
`ing portion from an external force exerted thereto.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`20
`
`5
`caused by a skin effect. Further, as a magnetic material from
`which the planar core is made, there may be used ferromag(cid:173)
`netic ferrite, silicate steel sheet or the like. Although the
`silicate steel sheet has a larger loss in comparison with the
`ferrite, it can be used in a relatively low frequency band. It is
`noted that an iron core produces eddy currents which generate
`a heat, and accordingly, is inconvenient.
`Further, in the present invention, by arranging the above(cid:173)
`mentioned thick wall parts and the thin wall parts alternately 10
`in the travel direction of the mobile object, the thick wall parts
`and the thin wall parts can be located with point symmetry
`with respect to the center point of the planer core. With this
`configuration, even though the planar core is set to be longer
`in the travel direction of the mobile object, the lightweight 15
`and cost reduction can be attained, and accordingly, the fab(cid:173)
`rication of the planar core can be facilitated. Moreover, since
`it can be longer in the travel direction of the mobile object, a
`higher power can be transmitted. Thus, the gap between the
`power feeding portion and the power receiving portion can be
`set to be larger, and accordingly, even though a large deviation
`in the horizontal direction is caused between the power feed(cid:173)
`ing portion and the power receiving portion when the mobile
`object comes to a stop, the inductance does not largely vary, 25
`thereby it is possible to transmit a higher power.
`Further, if it is not necessary to transmit a relatively high
`power, the planar core may be divided into pieces arranged
`along the travel direction of the mobile object with air gap 30
`parts being defined between the pieces, and these pieces may
`be formed of the air gap parts, excepts recesses, the thick wall
`parts and the thin wall parts being arranged with point sym(cid:173)
`metry with respect to the center point of the planar core. With
`this configuration, the lightweight and cost reduction can be 35
`further enhanced.
`Further, according to the present invention, there is pro(cid:173)
`vided a protecting apparatus for accommodating and protect(cid:173)
`ing the power feeding portion or the power receiving portion
`which have the above-mentioned configuration, including a 40
`protecting cover having an internal accommodation space is
`attached to a base board which is mounted to a mobile object,
`or provided in the vicinity of a track way for the mobile
`object, and the power feeding portion or the power receiving
`portion is accommodated
`in the internal accommodation
`space with a planar insulating member is interposed itself and
`the base board.
`The protecting apparatus according to the present inven(cid:173)
`tion, can prevent the power feeding portion or the power
`receiving portion from being deteriorated by external envi(cid:173)
`ronments such as dust and rain water in the case of attaching
`the power feeding portion on the road surface on which the
`mobile object runs, or attaching the power receiving portion
`to the lower part of the mo bile object or the like. Further, since 55
`the power feeding portion or the power receiving portion is
`covered with the protecting cover, it is possible to protect the
`power feeding portion or the power receiving portion from an
`external force applied thereto.
`With the protecting apparatus according to the present
`invention, in addition to the above-mentioned configuration,
`an air gap part is formed in the center part of the planar core,
`and a spacer is provided in the air gap part so as to fill the space
`between the planar insulation member and the protecting 65
`cover, thereby it is possible to allow the spacer to remarkably
`enhance the strength of the protecting cover, and therefore to
`
`45
`
`60
`
`FIG. lA is a perspective view illustrating a power feeding
`portion or a power receiving portion of a noncontact type
`power feeder system in a first embodiment of the present
`invention;
`FIG. 1B is a plan view illustrating the noncontact type
`power feeder system in which the power feeding portion and
`the power receiving portion are opposed face-to-face to each
`other,
`FIG. lC is a sectional view along line A-A in FIG. lA,
`FIG. 2 is a perspective view illustrating a power feeding
`portion or a power receiving portion in a second embodiment
`of the present invention;
`FIG. 3A is a plan view illustrating a noncontact type power
`feeder system in the second embodiment of the present inven-
`tion,
`FIG. 3B is a sectional view along line B-B in FIG. 3A,
`FIG. 3C is a sectional view along line C-C in FIG. 3A,
`FIG. 4 is a chart which show a magnetic induction lines
`produced in the noncontact type power feeder system in the
`second embodiment,
`FIG. 5 is a chart which shows magnetic flux density distri(cid:173)
`butions in a core width direction in the second embodiment
`and the prior art;
`FIG. 6 is a view for explaining a horizontally positional
`deviation of a mobile object in the second embodiment of the
`present invention,
`FIG. 7A is a plan view illustrating a noncontact type power
`feeder system in a third embodiment of the present invention,
`FIG. 7B is a sectional view along line D-D in FIG. 7A,
`FIG. 7C is a sectional view along line E-E in FIG. 7A,
`FIG. SA is a plan view illustrating a noncontact type power
`feeder system in a variant form of the third embodiment,
`FIG. SB is a sectional view along line F-F in FIG. SA,
`FIG. SC is a sectional view illustrating line G-G in FIG. SA,
`FIG. 9A is a plan view illustrating a noncontact type power
`feeder system in another variant form of the third embodi(cid:173)
`ment,
`FIG. 9B is a sectional view along line H-H in FIG. 9A,
`FIG. 9C is a sectional view along line I-I in FIG. 9A,
`FIG. 10 is an elevation sectional view illustrating a non(cid:173)
`contact type power feeder system in a fourth embodiment of
`50 the present invention,
`FIG. llA and FIG. 11B are views for explaining a joint
`structure between planar blocks,
`FIG.12A is a plan sectional view (sectional view along line
`L-L in FIG. 12B) illustrating a noncontact type power feeder
`system in a fifth embodiment of the present invention,
`FIG. 12B is a sectional view along line J-J in FIG. 12A,
`FIG. 12C is a sectional view along line K-K in FIG. 12A,
`FIG. 13A is a plan sectional view (sectional view along line
`P-P in FIG. 13B) illustrating a sixth embodiment of the
`present invention,
`FIG. 13B is a sectional view along line M-M in FIG. 13A,
`FIG. 13C is a sectional view along line N-N in FIG. 13A,
`and
`FIG. 14 is an exploded perspective view illustrating a pro(cid:173)
`tecting apparatus in the sixth embodiment of the present
`invention.
`
`Momentum Dynamics Corporation
`Exhibit 1024
`Page 016
`
`

`

`US 7,804,272 B2
`
`7
`DETAILED DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`Exemplified explanation will be hereinbelow made of pre(cid:173)
`ferred embodiments of the present invention with reference to
`the accompanying drawings. It is not intended to limit the
`scope of the present invention to the dimensions, materials,
`shapes, relative arrangements and the like of components
`which will be described in these embodiments unless other(cid:173)
`wise specified.
`
`Embodiment 1
`
`A first embodiment of the present invention will be
`explained with reference to FIGS. IA to lCin whichFIG. lA
`is a perspective view illustrating a power feeding portion or a
`power receiving portion of a noncontact type power feeder
`system to which the present invention is applied, FIG.1B is a
`plan view illustrating the noncontact type power feeder sys(cid:173)
`tem in which the power receiving portion and the power
`feeding portion are opposed face-to-face to each other, and
`FIG. lC is a sectional view along line A-A in FIG. 1B.
`Reference to FIGS. lA to lC, the power feeding portion 1 or
`the power receiving portion 2 is composed of an E-type core
`3 and the windings 4. The E-type core 3 is composed of
`several planar blocks 5 made of ferromagnetic ferrite, which
`are appropriately laid in a travel direction (a) of a mobile
`object and a direction orthogonal to the travel direction (a),
`and which are stacked one upon another while the adjacent
`planar blocks 5 are joined to one another by means of an
`adhesive or screws. Specifically, the power feeding portion 1
`or the power receiving portion 2 in this embodiment is com(cid:173)
`posed of 48 of the planar blocks 5 which are conveniently
`available at low costs as standards.
`Each of the planar block 5 has a planar member having a
`rectangular surface, and all planar blocks are arranged with
`their long sides being directed in the travel direction (a) and
`their short sides in a direction orthogonal to the travel direc(cid:173)
`tion (a). Thus, the power feeding portion 1 or the power
`receiving portion 2 is appropriate for the manufacture of a
`planar body having a rectangular surface, the long sides
`thereofbeing laid along the travel direction (a). It is noted that
`the shaded portions in FIG. 1B show parts where two planar
`blocks 2 are superposed one upon another so as to form
`protrusions (thick wall parts) 7.
`The windings are formed in an oval shape, and is set in a
`recess (8) defined between the protrusions (shaded portions)
`7 of the E-type core 3, the longitudinal direction of the oval
`shape being directed in the travel direction (a). Clearances 6 50
`are provided for forming curvature radii of the windings 4 at
`corners of the planer blocks 5.
`The above-mentioned power feeding portion 1 and the
`power receiving portion 2 are opposed face-to-face to each
`other with a gap g being defined therebetween. The power
`receiving portion 2 is mounted in a mobile vehicl