JPH0644301U - Electromagnetic power supply device for electric vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electromagnetic power supply device for an electric vehicle, which has excellent power conversion efficiency even though the work of aligning both cores is simple. [Structure] A secondary core 3 with 4 windings of a secondary coil is fixed to a vehicle, and a primary core 1 with 2 windings of a primary coil is fitted into a secondary core 3. The primary core 1 that needs to be moved is formed into a columnar shape (a T-shaped cross section) having a disk-shaped lid portion 11, and the secondary core 3 is formed into a bottomed cylindrical shape (a U-shaped cross section). In this way, the gap g1 on the center side is the bottom 32 of the secondary core 3.
On the other hand, the outer gap g2 is formed between the lid portion 11 of the primary core 1 and the tip surface of the cylindrical portion 31 of the secondary core 3, and these two gaps g1,
Since g2 is arranged on the opposite side in the axial direction, it is possible to greatly reduce the leakage magnetic flux that does not link with both the primary coil 2 and the secondary coil 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic power supply device for an electric vehicle.

[0002]

[Prior art]

 U.S. Pat. No. 4,347,472, 4496896 and Japanese Patent Laid-Open No. 63-73837 disclose that a secondary coil wound secondary core is fixed to the bottom or front of a battery-driven electric vehicle, and a primary coil wound primary core is attached to the ground side. It is disclosed that the cores are fixed and both cores are aligned by driving the electric vehicle to form a closed magnetic circuit with a gap to supply power.

When such a primary core and a secondary core are aligned to form a closed magnetic path with a gap, a closed magnetic path with a gap having a square cross section formed by combining a pair of cores having a U-shaped cross section is formed. There is known a closed magnetic circuit with a gap having a V-shaped cross section, which is configured by combining a pair of cores having an E-shaped cross section or a core having an E-shaped cross section and a bar-shaped core.

[0004]

[Problems to be solved by the device]

 However, in the proposal of the above publication, there is a problem that the power conversion efficiency (secondary active power / primary active power) is low because the cores cannot be precisely aligned and the gap length is large. In addition, in order to improve power conversion efficiency, both cores must be increased in size, but increasing the size of the core cannot achieve significant improvement in power conversion efficiency. Further, in the conventional technology, the position and shape of the secondary core in the vehicle body are regulated in accordance with the shape and position of the primary core on the ground side, which is a great constraint on the vehicle design. In view of the above problems, the inventors of the present invention grasp the primary core (station side) wound with the primary coil and align it with the secondary core, and if power is supplied in this state, precise alignment can be achieved. We thought that the core could be downsized because the gap could be reduced.

However, when grasping such a small primary core and aligning it with the secondary core, there are the following problems. First, when using such a small primary core or secondary core, if each core shape is U-shaped or E-shaped as in the conventional case, two adjacent gap portions are close to each other, and thus the magnetic flux is generated between the gaps. There is a problem in that the power conversion efficiency is reduced due to leakage and an increase in leakage flux.

Next, when such a small primary core or secondary core is used, the areas of the magnetic flux input / output end faces of both are small, so that both cores are precisely aligned in the direction parallel to the magnetic flux input / output end face. Then, it is necessary to overlap them so that the magnetic flux inflow and outflow end faces of both do not shift. However, such alignment work has a problem that it becomes difficult to attach and detach the primary core and the secondary core.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electromagnetic power supply device for an electric vehicle that has excellent power conversion efficiency even though the alignment work of both cores is simple. It is a problem to be solved.

[0008]

[Means for Solving the Problems]

 An electromagnetic power feeder for an electric vehicle according to the present invention comprises a soft magnetic secondary core having a bottomed cylindrical shape and disposed on a vehicle body, and a secondary coil wound along an inner peripheral surface of the secondary core. And a disk-shaped lid portion and a column portion that stands upright on the central axis of the lid portion. When the outer peripheral portion of the lid portion is close to the tip surface of the cylindrical portion of the secondary core, It is characterized by comprising a soft magnetic primary core whose tip is close to the bottom of the secondary core, and a primary coil wound around a cylindrical portion of the primary core.

In a preferred aspect, a locking protrusion protruding from one of a stationary portion including the secondary core and the vehicle body and a rotating portion including the primary core, and the other of the stationary portion and the rotating portion. And a locking groove capable of locking the locking projection, wherein the locking groove is a shaft into which the locking projection can be fitted when the cylindrical portion of the primary core is fitted into the secondary coil. Direction groove portion and a circumferential groove portion that enables relative rotation of the locking projection with respect to the locking groove after the locking projection is fitted and prohibits axial release of the locking projection from the locking groove. With.

In a preferred aspect, the rotating portion has a non-magnetic, can-shaped outer lid attached to the lid portion of the primary core, and the locking protrusion and the outer periphery surface of the outer lid. One of the locking grooves is formed. In a preferred aspect, the outer lid is coupled to the lid portion of the primary core via an elastic member.

In a preferred aspect, the lid portion and the outer lid include a relative rotation regulating portion that regulates relative rotation of the lid portion and the outer lid around the central axis of the primary core.

[0012]

[Action and effect of the device]

 In this electromagnetic power feeder for an electric vehicle, the secondary core of the secondary coil (power receiving side) winding is fixed to the vehicle, and the primary core of the primary coil (power transmitting side) winding is fitted into the secondary core. The primary core that needs to be moved is formed into a columnar shape (a T-shaped cross section) having a disk-shaped lid, and the secondary core is formed into a cylindrical shape with a bottom (a U-shaped cross section).

With this configuration, the central gap is formed near the bottom of the secondary core, while the outer gap is formed between the lid of the primary core and the tip surface of the cylindrical portion of the secondary core. Since these two gaps are arranged on the opposite sides in the axial direction, it is possible to greatly reduce the leakage flux that does not link with both the primary coil and the secondary coil.

Further, since the primary core, the secondary core, the primary coil, and the secondary coil have the above-described shapes, the primary core and the secondary core can rotate relative to each other, and the primary coil wound primary core The two can be easily aligned by simply fitting them into the holes of the secondary coil. Also, the gap length can be reduced simply by pressing the primary core in the direction of insertion.

Further, since the outer peripheral surface of the primary coil is held by the inner peripheral surface of the secondary coil, relative displacement of the primary core relative to the secondary core in the direction perpendicular to the axis can be restricted. Further, since the primary core and the secondary core completely surround the coils, the leakage flux to the outside is small and the power conversion efficiency can be further improved. However, there may be some missing parts in the shape of the double-sided shielded cylindrical body composed of the primary core and the secondary core.

[0016]

【Example】

 (Embodiment 1) An embodiment of the electromagnetic power supply device of the present invention is shown in FIGS. FIG. 1 is a perspective view showing a state immediately before the primary core is fitted into the secondary core. The rear trunk 9 of the vehicle body has a square opening 92 with a lid 91. When the opening 92 is opened, the secondary core 3 made of soft magnetic ferrite is fixed inside the trunk 9, and the secondary coil 4 is wound along the inner peripheral surface of the secondary core 3.

On the other hand, on the outside of the opening 92, there is a primary core 1 made of soft magnetic ferrite and grasped by a hand (not shown), and it is about to be fitted to the secondary core 3. A primary coil 2 is wound around the outer periphery of the primary core 1. FIG. 2 is an axial sectional view showing a state in which the primary core 1 is fitted in the secondary core 2. An outer peripheral end of a cylindrical case 93 having an upper end opening is welded to the trunk 9, and the secondary core 3 is fitted and fixed to the case 93.

The secondary core 3 includes a cylindrical portion 31 having an upper end opening and a disk-shaped bottom portion 32 that shields the base end side opening of the cylindrical portion 31. On the other hand, the primary core 1 has a disk-shaped lid portion 11 and a column portion 12 that stands upright on the central axis of the lid portion, and the outer peripheral portion of the lid portion 11 is the tip surface of the cylindrical portion 31 of the secondary core 3. It is designed so that the tip of the cylindrical portion 12 of the primary core 1 comes into close contact with the bottom portion 32 of the secondary core 4 when it comes into close contact with 31 a. A primary coil 2 is wound around the cylindrical portion 12 of the primary core 1.

An inner case 5 made by pressing an aluminum plate is fitted to the lid portion 11. The inner peripheral surface and the bottom surface of the inner case 5 are bonded to the outer peripheral surface of the lid portion 11 and the circular upper surface 11 a. ing. An outer case 6 formed by pressing an aluminum plate is axially slidably fitted to the lid portion 11, and a closed space between the inner surface of the bottom of the outer case 6 and the outer surface of the bottom of the inner case 5 is closed. A rubber plate (elastic member) 7 is housed in the. Both rubber plates 7 each having a semicircular shape are arranged in a substantially circular shape with a linear gap at a constant interval, and both end faces of both rubber plates 7 have a bottom inner surface of the outer case 6 and a bottom part of the inner case 5. It is adhered to the outer surface. Guide projections 51 and 61 are individually provided on the inner surface of the bottom of the outer case 6 and the inner surface of the bottom of the inner case 5 located in the linear gap, and the pair of guide projections 61 are slidable in the axial direction of the guide projections 51. , It is sandwiched so that it cannot be displaced relative to the circumferential direction. As a result, the inner case 5 and the outer case 6 cannot rotate relative to each other. The guide protrusions 51 and 61 form a relative rotation restricting portion in the present invention.

Further, as shown in FIGS. 1 and 2, a locking groove 63 is formed in the peripheral wall of the outer case 6, and the locking groove 63 is formed in the axial direction and opens at the tip of the peripheral wall. It is composed of an axial groove portion 63a and a circumferential groove portion 63b which is bored in the circumferential direction from the inner depth of the axial groove portion 63a. Further, a locking projection 94 facing the outer wall of the outer case 6 is provided in the center of the case 93 at a small distance from the peripheral wall of the outer case 6, and is fitted in the circumferential groove 63b in FIG. Escape from the next core 3 outward in the axial direction is restricted.

Reference numeral 8 denotes a handle fixed to the outer case 6, and a cable 81 extending from the handle 8 supplies power to the primary coil 2. Next, the operation of this device will be described. When the primary core 1 is axially inserted into the secondary coil 4 while holding the handle 8, the magnetic flux input / output end faces 15 and 35 of both cores 1 and 3 are in close contact with each other, and a closed magnetic path with a gap is completed.

The rubber plate 7 is compressed when the cores 1 and 3 collide with each other, absorbs a shock, and prevents the cores 1 and 3 from being damaged. After the primary core 1 15 comes into close contact with the magnetic flux output / inlet end surface 35 of the secondary core 3, when the handle 8 is rotated while being pressed, the locking projection 94 is fitted into the axial groove portion 63a of the locking groove 63, and And the outer case 6 is locked to the case 93 by the bias of the rubber plate 7. As a result, the rubber plate 7 presses the primary core 1 against the secondary core 3, the gap between the magnetic flux output / inlet end faces 15 and 35 is reduced, and the power conversion efficiency is improved.

As described above, in the electromagnetic power feeder for an electric vehicle of the present invention, the central gap g 1 is formed in the vicinity of the bottom 32 of the secondary core 3, while the outer gap g 2 of the primary core 1 is formed. Since it is formed between the lid portion 11 and the tip surface of the cylindrical portion 31 of the secondary core 3, these two gaps g1 and g2 are arranged on the opposite sides in the axial direction, so that the primary coil 1 and It is possible to significantly reduce the leakage magnetic flux that does not interlink with both the secondary coils 3.

Further, since the primary core 1, the secondary core 3, the primary coil 2 and the secondary coil 4 have the coaxial concentric shape, the primary core 1 and the secondary core 3 can rotate relative to each other, and Only by inserting the primary core 1 of the coil 2 winding into the hole of the secondary coil 4, the positions of the two can be easily adjusted. In addition, the gap length can be reduced only by pressing the primary core 1 in the fitting direction.

Further, since the outer peripheral surface of the primary coil 2 is held by the inner peripheral surface of the secondary coil 4, it is possible to prevent the primary core 1 from being displaced relative to the secondary core 3 in the direction perpendicular to the axis. it can. Further, since the primary core 1 and the secondary core 3 completely surround the coils 2 and 4, the leakage flux to the outside is small and the power conversion efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an electromagnetic power feeding device of the present invention, particularly showing a state where a primary core is being inserted;

2 is an axial cross-sectional view of the device of FIG.

[Explanation of symbols]

1 is a primary core, 2 is a primary coil, 3 is a secondary core, 4 is a secondary coil, 11 is a lid portion, 12 is a cylindrical portion, 31 is a cylindrical portion,
32 is the bottom.

Claims (5)

[Scope of utility model registration request] 1. A soft magnetic secondary core, which has a bottomed cylindrical shape and is disposed on a vehicle body, a secondary coil wound along an inner peripheral surface of the secondary core, and a disk-shaped lid. Portion and a columnar portion that stands upright on the central axis of the lid portion, and when the outer peripheral portion of the lid portion is close to the tip surface of the cylindrical portion of the secondary core, the tip of the columnar portion is the secondary core An electromagnetic power feeding device for an electric vehicle, comprising: a soft magnetic primary core adjacent to the bottom of the primary core; and a primary coil wound around a cylindrical portion of the primary core. 2. A locking protrusion protruding from one of a stationary portion including the secondary core and the vehicle body and a rotating portion including the primary core, and a locking protrusion formed in the other of the stationary portion and the rotating portion. A locking groove capable of locking the locking projection, wherein the locking groove is an axial groove into which the locking projection can be fitted when the cylindrical portion of the primary core is fitted into the secondary coil; A circumferential groove portion that enables relative rotation of the locking projection with respect to the locking groove after the locking projection is fitted, and prohibits axial release of the locking projection from the locking groove. 1. An electromagnetic power feeder for an electric vehicle according to 1. 3. The rotating portion has a non-magnetic, can-shaped outer lid attached to the lid portion of the primary core, and the locking protrusion and the locking groove are formed on an outer peripheral surface of the outer lid. The electromagnetic power feeder for an electric vehicle according to claim 2, wherein one of them is formed. 4. The electromagnetic power feeder for an electric vehicle according to claim 3, wherein the outer lid is coupled to the lid portion of the primary core via an elastic member. 5. The electric motor according to claim 4, wherein the lid portion and the outer lid include a relative rotation regulation portion that regulates relative rotation between the lid portion and the outer lid around the central axis of the primary core. Electromagnetic power supply device for cars.