JP2006353064A - Inductor and inductor motor equipped with inductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate manufacture of an inductor suitably employed in an axial gap type motor and to reduce eddy current generated when an AC magnetic field acts on the inductor. <P>SOLUTION: The inductor having one end face arranged oppositely to an armature coil and the other end face arranged oppositely to a field body is formed by bundling a plurality of linear magnetic bodies 40. One end face of these linear magnetic bodies 40 in the longitudinal direction opposes the armature coil and the other end face opposes the field body. Cross-sectional areas of these linear magnetic bodies 40 are same in the direction perpendicular to the direction of flux being the longitudinal direction, and the profile of cross-section in the perpendicular direction is different between one end face and the other end face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inductor and an inductor-type motor including the inductor, and more specifically, an inductor made of a magnetic material that guides a magnetic flux on a field side to a required position and an axial gap type including the inductor. It relates to motors.

  Conventionally, Japanese Patent Laid-Open No. 54-116610 (Patent Document 1) and Japanese Patent Laid-Open No. 6-86517 (Patent Document 2) disclose a generator using an inductor. In the generator, as shown in FIG. 7, a field winding is provided on the outer periphery of a yoke 4 that passes through a bracket 2 serving as an outer cylinder through a bearing 3 and is fitted and fixed to the driving shaft 1. 5 and claw-shaped magnetic poles 6 and 7 (inductors) protruding alternately from the left and right sides of the field winding 5 are provided to form a rotor as a whole. On the other hand, the stator 2 is provided on the bracket 2 so as to face the claw-shaped magnetic poles 6 and 7. In addition, the power supply to the field winding 5 is configured to supply power slidably through the slip ring 9.

According to the above configuration, when a direct current is supplied to the field winding 5 through the slip ring 9, an N pole is generated on the right side of the field winding 5 in the figure and an S pole is generated on the left side of the figure. , The N pole is guided to the claw-shaped magnetic pole 6 protruding from the right side, and the S pole is guided to the claw-shaped magnetic pole 7 protruding from the left side. That is, by providing only one field winding 5 wound around the drive shaft 1, a plurality of N poles and S poles can be alternately generated in the circumferential direction on the outer peripheral side of the rotor. .
Some motors use inductors.

When the claw-shaped magnetic pole (inductor) is formed by bending a metal plate into a required shape as in Patent Document 1 and Patent Document 2, the inductor can be easily formed.
However, for example, when an inductor is used in an axial gap type motor, the inductor may be massive. Such a bulk inductor is formed by cutting a bulk magnetic body to form an inductor having a required shape, or pouring molten metal into a mold to form an inductor having a required shape. Then, it takes a lot of labor and cost to manufacture the inductor, and when an AC magnetic field acts on the inductor formed by these methods, an eddy current is generated, resulting in energy loss.

JP 54-116610 A JP-A-6-86517

  The present invention has been made in view of the above problems, and facilitates the production of an inductor suitably used for an axial gap type motor, and reduces the eddy current generated when an AC magnetic field acts on the inductor. The challenge is to do.

In order to solve the above-mentioned problem, the present invention is an inductor in which one end surface is disposed opposite to an armature coil and the other end surface is disposed opposite to a field body,
A plurality of linear magnetic bodies are formed by converging, and one end surface in the length direction of these linear magnetic bodies is a surface facing the armature coil, and the other end surface is a surface facing the field body. The cross-sectional area in the vertical direction with respect to the magnetic flux direction, which is the length direction of these linear magnetic bodies, is the same, and the cross-sectional shape in the vertical direction is different between the one end face and the other end face. An inductor is provided.

According to the above configuration, the inductor having the required shape is formed by converging the linear magnetic body having flexibility, so that it is possible to easily form the inductor whose cross-sectional shape is different between the one end surface and the other end surface. Can do.
In addition, since the length direction of the linear magnetic body and the magnetic flux direction are matched, the flow of magnetic flux in a predetermined direction can be improved. Further, since an eddy current generated when an AC magnetic field acts on the inductor flows between different linear magnetic bodies, this eddy current can be reduced and energy loss can be reduced.
Furthermore, if the cross-sectional area in the direction perpendicular to the direction of the magnetic flux passing through the inductor is different, the magnetic flux is saturated at a location where the cross-sectional area is small, and torque is reduced when the inductor is used for a motor or the like. Conversely, at locations where the cross-sectional area is large, the cross-sectional area becomes larger than necessary, causing waste in the inductor, and the inductor becomes heavy. On the other hand, in the inductor of the present invention, the linear magnetic body is formed by converging, so the cross-sectional area in the direction perpendicular to the magnetic flux direction which is the length direction of the linear magnetic body is always constant, and the torque is Reduction and unnecessary weight increase of the inductor can be prevented.

The outer peripheral surface of the linear magnetic body is insulated with a resin, and the plurality of insulated linear magnetic bodies are converged with different shapes in the direction perpendicular to the length direction and resin molded. preferable.
According to the above configuration, since the linear magnetic body is insulated with resin in all directions different from the magnetic flux direction, eddy current generated when an AC magnetic field acts on the inductor can be reduced.
Moreover, since the outer peripheral surface of each linear magnetic body is coat | covered with resin, an inductor can be type | molded to a required shape by hardening resin. In addition, when the outer peripheral surface of each linear magnetic body is not coat | covered with resin, it is preferable to mold the outer peripheral surfaces other than the both end surfaces of the inductor formed in a required shape for molding with resin.

  The linear magnetic body is a metal made of silicon steel, permender, iron, permalloy or the like, and preferably has a diameter of 0.1 to 1.0 mm, more preferably 0.3 to 0.7 mm.

The diameter of the linear magnetic material is set to 0.1 mm or more. If the diameter is smaller than 0.1 mm, the number of linear magnetic materials required to form an inductor having a required cross-sectional area becomes too large. This is because it becomes difficult to form the inductor, and when the linear magnetic body is covered with a resin, the cross-sectional area of the magnetic body portion becomes small. Moreover, the diameter of the linear magnetic body is set to 1.0 mm or less because if it is larger than 1.0 mm, the rigidity of the linear magnetic body becomes high and it becomes difficult to form an inductor having a required shape.
In particular, the linear magnetic body is preferably provided with anisotropy so that magnetic flux can easily flow in the length direction of the linear magnetic body. For example, silicon steel may be stretched without increasing the temperature.
Silicon steel is brittle and hard, but by forming it in a wire shape, flexibility can be obtained and an inductor having a complicated shape can be easily formed.

One end surface of the inductor is preferably either circular or arcuate and the other end surface is preferably the other.
According to the above configuration, since the end face of the inductor is circular or arcuate and the inductor is opposed to the magnetic flux generation region of the armature coil or field body, the inductor is efficiently magnetized, and the inductor is The used motor or the like can rotate the rotor with high efficiency.
In addition, since the inductor is formed by converging the linear magnetic bodies as in the present invention, it is possible to easily form even an inductor having different shapes on both end faces.

  As a method for forming the inductor of the present invention, for example, a plurality of linear magnetic bodies whose outer peripheral surfaces are insulated and coated with a thermosetting resin are focused, and the focused linear magnetic bodies are arranged in a mold. Then, the resin is integrated and cured by heating to the required shape and heating. Then, when there is an unnecessary part, the part is cut out to form an inductor having a required shape.

The present invention also includes a rotor having the inductor and a center hole fixed to the drive shaft, and an armature side stator and a field side stator disposed on both sides in the axial direction of the rotor. An axial gap type inductor motor,
An armature coil is disposed in the armature side stator with an interval in the circumferential direction, and a ring-shaped field body is disposed in the field side stator,
Inductors attached to the rotor are attached to the rotor body at intervals in the circumferential direction and penetrating in the axial direction. One end face of these inductors is opposed to the armature coil and the other end face is Provided is an inductor type motor characterized in that magnetic poles having opposite polarities are formed alternately in the circumferential direction by alternately facing the outer circumferential side and the inner circumferential side of the field body. Yes.

  In the above-mentioned axial gap type inductor type motor, the inductor is agglomerated, but since the inductor is formed by converging the linear magnetic material as described above, the inductor can be easily formed. Can do.

One end surface of the inductor facing the armature coil has a circular shape, and the other end surface facing the field body has a circular arc shape facing the outer peripheral side or inner peripheral side of the field body. It is preferable.
According to the above configuration, since both end faces of the inductor are opposed to the armature coil and the magnetic flux generation region of the field body as described above, the inductor is efficiently magnetized, and the rotor of the inductor type motor is raised. It can be rotated with efficiency.

It is preferable that the field body and / or the armature coil is formed of a superconducting material.
When the field body and / or the armature coil is formed of a superconducting material, a large current can be supplied, the generated magnetic flux can be greatly strengthened, and high output can be achieved. Moreover, since a large current density can be obtained by achieving superconductivity, the field body and the armature coil can be reduced, and the inductor motor can be reduced in size and weight. As the superconducting material, it is preferable to use a high temperature superconducting material such as bismuth or yttrium.

As described above, according to the present invention, an inductor having a required shape is formed by converging a linear magnetic material having flexibility, so that even an inductor having a different cross-sectional shape at one end surface and the other end surface can be used. It can be formed easily.
In addition, since the inductor is formed by converging the linear magnetic body, the cross-sectional area in the direction perpendicular to the magnetic flux direction, which is the length direction of the linear magnetic body, is always constant, and the magnetic flux is saturated in the inductor. It becomes difficult. Therefore, when the inductor is used for a motor, the magnetic flux generated in the field body can be efficiently guided to the armature coil side.

  When the outer peripheral surface of each linear magnetic body is insulated and coated with resin, all directions different from the magnetic flux direction are insulated with resin, so that eddy currents generated when an AC magnetic field acts on the inductor can be reduced.

  An axial gap type comprising the rotor having the inductor and a center hole fixed to the drive shaft, and an armature side stator and a field side stator disposed on both sides in the axial direction of the rotor. The inductor type motor has a circular end surface opposite to the outer peripheral side or inner peripheral side of the field body while one end surface facing the armature coil of the inductor is circular and the other end surface facing the field body is circular. With the shape, the inductor is efficiently magnetized, and the rotor can be rotated with high efficiency.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an inductor type motor 10 of the embodiment.
The inductor type motor 10 is an axial gap type, and penetrates through the drive shaft 34 in the order of the field side stator 11, the rotor 12, the armature side stator 13, the rotor 14, and the field side stator 15, The field-side stators 11 and 15 and the armature-side stator 13 are fixed to the installation surface G and have a gap with the drive shaft 34, and the rotors 12 and 14 are externally fixed to the drive shaft 34.

The field side stator 11 and the field side stator 15 are bilaterally symmetric, and FIGS. 4A and 4B show only one field side stator 15 as a representative.
The field side stators 11 and 15 include yokes 16 and 29 made of a magnetic material fixed to the installation surface G, heat insulating refrigerant containers 17 and 30 having a vacuum heat insulating structure embedded in the yokes 16 and 29, and a heat insulating refrigerant container. 17 and 30 and field coils 18 and 31 which are windings made of a superconducting material.
The yokes 16 and 29 have loose fitting holes 16b and 29b drilled at the center larger than the outer diameter of the drive shaft 34, and groove portions 16a and 29a recessed in an annular shape around the loose fitting holes 16b and 29b. I have. The heat insulating refrigerant containers 17 and 30 contain the field coils 18 and 31 in a state where liquid nitrogen is circulated, and the heat insulating refrigerant containers 17 and 30 are embedded in the grooves 16a and 29a.
The yokes 16 and 29 are made of a magnetic material such as permender, silicon steel plate, iron, and permalloy. Further, as a superconducting material for forming the field coils 18 and 31, a superconducting material such as bismuth or yttrium is used.

The rotors 12 and 14 are bilaterally symmetric, and one of the rotors 14 is representatively described in FIGS.
The rotors 12 and 14 are disk-shaped and made of a nonmagnetic material and have rotor main bodies 19 and 26 having center holes 19a and 26a, and a pair of S pole inductions embedded in point-symmetric positions around the center holes 19a and 26a. And a pair of N-pole inductors 20 and 28 embedded at positions rotated by 90 ° from the S-pole inductors 21 and 27.

As shown in FIG. 3A, the S pole inductors 21 and 27 and the N pole inductors 20 and 28 converge a plurality of linear magnetic bodies 40 whose outer peripheral surfaces are insulated with a thermosetting resin 41 as shown in FIG. Then, the resin 41 is integrated as shown in FIG. 3C by placing the focused linear magnetic body 40 in a mold so as to obtain a required shape as shown in FIG. 3B and heating. And hardened. Thus, the south pole inductors 21 and 27 and the north pole inductors 20 and 28 formed in a required shape are molded in the rotor bodies 19 and 26. 3A to 3C show the formation process of the N-pole inductors 20 and 28. The one end surfaces 20a and 28a are circular, and the other end surfaces 20b and 28b are arc-shaped. In the S pole inductors 21 and 27, the other end surfaces 21b and 27b are formed in an arc shape that is longer than that of the N pole inductors 20 and 28.
The south pole inductors 21 and 27 and the north pole inductors 20 and 28 converge the same number of the same linear magnetic bodies 40. Therefore, the S-pole inductors 21 and 27 and the N-pole inductors 20 and 28 have the same cross-sectional area in the direction perpendicular to the magnetic flux direction of the passing magnetic flux at any location. Specifically, it is preferable to have converged linear magnetic body 40 having a diameter of 0.1 mm to 1.0 mm 10 to 10 ⁸ present, in the present embodiment, the linear magnetic body 40 having a diameter of 0.5 mm 12 Ten thousand are concentrated.
The linear magnetic body 40 is made of a magnetic material such as silicon steel, permender, iron, permalloy, and in particular, the wire-like silicon steel is stretched without increasing the temperature and has anisotropy. Is preferred.

  As shown in FIG. 2A, the S-pole inductors 21 and 27 and the N-pole inductors 20 and 28 are concentric with the circular end faces 20a, 21a, 27a, and 28a facing the armature-side stator 13, respectively. They are arranged at equal intervals on the top.

The other end faces 21b and 27b of the S pole inductors 21 and 27 are arranged so as to face the S pole generation position of the field coils 18 and 31, for example, the other end face 27b of the S pole inductor 27 is shown in FIG. ) And FIG. 5 (B), it is in the shape of a circular arc disposed opposite to the outer peripheral side of the field coil 31.
The other end faces 20b and 28b of the N pole inductors 20 and 28 are arranged so as to face the N pole generation position of the field coils 18 and 31, for example, the other end face 28b of the N pole inductor 28 is shown in FIG. ) And FIG. 5 (C), it is in the shape of a circular arc disposed opposite to the inner peripheral side of the field coil 31.

In other words, the S-pole inductors 21 and 27 and the N-pole inductors 20 and 28 have one end faces 20a, 21a, 20a, 21a, In 27a and 28a, it is set as the solid shape used as a circle. In addition, the cross-sectional area in the direction perpendicular to the magnetic flux direction of the south pole inductors 21 and 27 and the north pole inductors 20 and 28 is constant from the other end faces 20b, 21b, 27b, and 28b to the one end faces 20a, 21a, 27a, and 28a. Yes. The other end surfaces 20b, 28b of the south pole inductors 20, 28 have the same area as the other end surfaces 21b, 27b of the north pole inductors 21, 27.
The rotor bodies 19 and 26 are made of a nonmagnetic material such as FRP or stainless steel.

As shown in FIGS. 1A and 1B and FIG. 6, the armature-side stator 13 includes a support portion 22 made of a nonmagnetic material fixed to the installation surface G, and a vacuum heat insulation embedded in the support portion 22. A heat insulating refrigerant container 23 having a structure and an armature coil 24 that is a winding made of a superconducting material housed in the heat insulating refrigerant container 23 are provided.
The support portion 22 includes a loose fitting hole 22b drilled at the center larger than the outer diameter of the drive shaft 34, and four mounting holes 22a drilled at equal intervals in the circumferential direction around the loose fitting hole 22b. ing. The adiabatic refrigerant container 23 accommodates the armature coil 24 in a state where liquid nitrogen is circulated, and a flux collector 25 made of a magnetic material is disposed in a hollow portion of the armature coil 24. Four heat-insulating refrigerant containers 23 accommodating the armature coils 24 are embedded in the respective coil mounting holes 22a.
The flux collector 25 is made of a magnetic material such as a permender, a silicon steel plate, iron, or permalloy. Further, as the superconducting material forming the armature coil 24, a bismuth-based or yttrium-based superconducting material is used. Moreover, the support part 22 is formed with nonmagnetic materials, such as FRP and stainless steel.

A power feeding device 32 is connected to the field coils 18 and 31 and the armature coil 24 via wiring, and a direct current is supplied to the field coils 18 and 31 and a three-phase alternating current is supplied to the armature coil 24. ing.
A liquid nitrogen tank 33 is connected to the heat-insulating refrigerant containers 17, 23, and 30 through heat-insulating piping, and circulates liquid nitrogen as a refrigerant.

Next, the operating principle of the inductor type motor 10 will be described.
When a direct current is fed to the field coil 31 on the right side in FIG. 1, an S pole is generated on the outer peripheral side and an N pole is generated on the inner peripheral side. Then, as shown in FIGS. 5A and 5B, the magnetic flux on the S pole side is introduced into the S pole inductor 27 from the other end face 27b, and the S pole magnetic flux appears on the one end face 27a. Further, as shown in FIGS. 5A and 5C, the magnetic flux on the N pole side is introduced into the N pole inductor 28 from the other end face 28b, and the N pole magnetic flux appears on the one end face 28a. Here, since the other end surfaces 27 b and 28 b are arranged on concentric circles along the inner and outer peripheries of the field coil 31, the S pole is always provided on the one end surface 27 a of the S pole inductor 27 even when the rotor 14 rotates. Appears, and the N pole always appears on the one end face 28a of the N pole inductor 28.
When a direct current is supplied to the left field coil 18 in FIG. 1 according to the same principle, an N pole always appears on one end face 20 a of the N pole inductor 20 of the rotor 12, and one end face 21 a of the S pole inductor 21. Always has an S pole.

  When three-phase alternating current is fed to the armature coil 24 from this state, a rotating magnetic field is generated around the axis of the armature-side stator 13 due to a feeding phase shift between the three phases, and the rotors 12 and 14 are affected by this rotating magnetic field. A rotational force around the axis is generated in the N-pole inductors 20 and 28 and the S-pole inductors 21 and 27, the rotors 12 and 14 are rotated, and the drive shaft 34 is rotationally driven.

According to the above configuration, the linear magnetic bodies 40 having flexibility are converged to form the inductors 20, 21, 27, and 28 having the required shapes, so that the cross-sectional shapes are different between the one end surface and the other end surface. Even an inductor can be easily formed.
Further, since the inductors 20, 21, 27, and 28 are formed by converging the linear magnetic body 40, the cross-sectional area in the direction perpendicular to the magnetic flux direction that is the length direction of the linear magnetic body 40 is always constant. The magnetic flux is less likely to be saturated in the inductor. Therefore, the magnetic flux generated by the field coils 18 and 31 can be efficiently guided to the armature coil 24 side, and the rotor 13 can be rotated with high efficiency. Further, since the cross-sectional area of the N-pole inductors 20 and 28 and the cross-sectional area of the S-pole inductors 21 and 27 are the same, the attractive force / repulsive force generated between the armature coil 24 is constant, and the rotation The rotational balance of the children 12 and 14 is stabilized.
Furthermore, since the outer peripheral surface of each linear magnetic body 40 is insulated and coated with resin 41 and all directions different from the magnetic flux direction are insulated with resin, an AC magnetic field acts on inductors 20, 21, 27, and 28. Can be reduced.

Note that either one of the field coils 18 and 31 or the armature coil 24 may be formed of a normal conductive material such as a copper wire, and in that case, a cooling structure for the normal conductive wire can be omitted. .
Moreover, in this embodiment, the rotor provided with the inductor is arranged on both sides of the armature side stator, and the field side stator is arranged on both outer sides of these rotors. May be arranged in the center, rotors having inductors may be arranged on both sides of the field side stator, and armature side stators may be arranged on both outer sides of these rotors.
Furthermore, although it is set as the motor in this embodiment, you may utilize as a generator with the same structure.

  The inductor of the present invention is suitably used for an axial gap type inductor motor, and the inductor motor is used as a drive source for automobiles, ships, and the like.

(A) is sectional drawing of the inductor type motor of embodiment of this invention, (B) is sectional drawing in the position rotated 90 degrees. (A) is a front view of the rotor, (B) is a cross-sectional view taken along line II of (A), (C) is a rear view, and (D) is a cross-sectional view taken along the line II-II of (A). (A)-(C) are drawings which show the preparation processes of an inductor. (A) is a front view of a field side stator, (B) is the II sectional view taken on the line of (A). (A) is a front view of a state where a rotor and a field side stator are penetrated by a drive shaft, (B) is a cross-sectional view taken along line II of (A), and (C) is a line II-II of (A). It is sectional drawing. It is a front view of an armature side stator. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inductor type motors 11, 15 Field side stators 12, 14 Rotor 13 Armature side stators 17, 23, 30 Vacuum insulation container 18, 31 Field coils 20, 28 N pole inductors 21, 27 S pole Inductor 24 Armature coil 34 Drive shaft

Claims (7)

One end face is disposed opposite to the armature coil, and the other end face is disposed to face the field body,
A plurality of linear magnetic bodies are formed by converging, and one end surface in the length direction of these linear magnetic bodies is a surface facing the armature coil, and the other end surface is a surface facing the field body. The cross-sectional area in the vertical direction with respect to the magnetic flux direction, which is the length direction of these linear magnetic bodies, is the same, and the cross-sectional shape in the vertical direction is different between the one end face and the other end face. Inductor to do.   The outer peripheral surface of the linear magnetic body is insulated and coated with a resin, and the plurality of linearly coated linear magnetic bodies are converged with different shapes in the direction perpendicular to the length direction and resin molded. The inductor according to 1.   3. The inductor according to claim 1, wherein the linear magnetic body is a metal made of silicon steel, permender, iron, and permalloy, and has a diameter of 0.1 to 1.0 mm.   The inductor according to any one of claims 1 to 3, wherein one end surface of the inductor is circular or arcuate and the other end surface is the other. A rotor including the inductor according to any one of claims 1 to 4 and having a center hole fixed to a drive shaft, and an armature side stator disposed on both sides in the axial direction of the rotor; An axial gap type inductor motor having a field side stator,
An armature coil is disposed in the armature side stator with an interval in the circumferential direction, and a ring-shaped field body is disposed in the field side stator,
Inductors attached to the rotor are attached to the rotor body at intervals in the circumferential direction and penetrating in the axial direction. One end face of these inductors is opposed to the armature coil and the other end face is An inductor-type motor characterized in that magnetic poles having opposite polarities alternately formed in the circumferential direction are formed by alternately opposing the outer circumferential side and the inner circumferential side of the field body in the circumferential direction.   One end surface of the inductor facing the armature coil has a circular shape, and the other end surface facing the field body has a circular arc shape facing the outer peripheral side or inner peripheral side of the field body. The inductor type motor according to claim 5.   The inductor type motor according to claim 5 or 6, wherein the field body and / or the armature coil is formed of a superconducting material.

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