JP2009011048A - Air-gap measuring method, method of manufacturing axial gap type rotating machine, and axial gap type rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-gap measuring method capable of measuring an air-gap from a different direction even if it is difficult to measure the air-gap from a direction perpendicular to a rotary shaft. <P>SOLUTION: A stator 1 has a surface 1a. Through holes 11 each penetrate through the stator 1 and are opened on the surface 1a. A rotor 2 has a surface 2a facing the surface 1a on the rotary shaft. For example, a gauge is inserted into each through hole 11 to measure a distance (distance between air-gaps) between the surface 1a and the surface 2a on the rotary shaft. Accordingly, even if it is difficult to measure the air-gap at the direction perpendicular to the rotary shaft, the air-gap can be measured at the different direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air gap measuring method, an axial gap type rotating machine manufacturing method, and an axial gap type rotating machine.

  Patent Document 1 exemplifies a compressor equipped with an axial gap type motor. In the axial gap type motor, the rotor and the stator face each other through a predetermined air gap along the rotation axis.

  Generally, in assembling or inspecting an axial gap type rotating machine, an air gap is measured by inserting a thickness gauge, for example, from a direction perpendicular to the rotation axis.

JP 2004-52657 A

  However, when an axial gap type motor is applied to a hermetic compressor, for example, the stator and the rotor are covered with the case around the rotation shaft, and therefore the thickness gauge cannot be inserted into the air gap from the direction perpendicular to the rotation shaft.

  Therefore, an object of the present invention is to provide an air gap measurement method capable of measuring an air gap from different directions even when it is difficult to measure the air gap from a direction perpendicular to the rotation axis.

  A first aspect of an air gap measurement method according to the present invention includes a first magnetic body (1; 2; 3; 100; 200) having a first surface (1a; 2b; 3a; 100a; 200b), a predetermined surface, A second magnetic body (2; 3; 2; 200; 300) having a second surface (2a; 3a; 2b; 200a; 300a) facing the first surface on the axis (P), In the axial gap type rotating machine, the magnetic body has a through hole (11; 21; 31; 110; 210) penetrating through itself and opening on the first surface, and the first surface in the extending direction of the shaft And an air gap measuring method for measuring an air gap distance between the second surface and the second surface.

  A second aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the first aspect, wherein the first magnetic body (1; 2; 3; 100,200) has the axis (P). A third surface (1b; 2a; 3b; 100b; 200a) located on the opposite side of the first surface (1a; 2b; 3a; 100a; 200a) in the extending direction of the through hole (11; 21; 31; 110; 210) passes through the first magnetic body from the third surface toward the first surface, and passes through the through hole (11; 21; 31; 110; 210). A first length (L1) from the third surface to the second surface (2a; 3a; 2b; 200a; 300a) is measured, and from the first length, the first surface is measured from the third surface. The distance is measured by subtracting the second length (L2) to the surface.

  A third aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the first or second aspect, wherein the through hole (11; 21; 31; 110; 210) has a gauge (4 ) To measure the interval.

  A fourth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the third aspect, wherein the through hole (11; 21; 31; 110; 210) is a third surface (1b; 2a; 3b; 110b; 210a) having a thick tip shape.

  A fifth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the first or second aspect, wherein the light passing through the through hole (11; 21; 31; 110; 210). And measuring the distance.

  A sixth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to fifth aspects, wherein the through hole (11; 21; 31; 110; 210) Is parallel to the extending direction of the axis (P).

  A seventh aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to fifth aspects, wherein the through hole (11; 21; 31; 110; 210) Is inclined with respect to the axis (P).

  An eighth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to seventh aspects, wherein the through hole (11; 21; 31; 110; 210) Are provided in a plurality in the radial direction around the axis (P), and the interval is measured via the plurality of through holes.

  A ninth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to eighth aspects, wherein the first magnetic body (1; 3; 200) includes: A plurality of teeth (12; 32; 220) that are annularly arranged around the shaft (P) and have both ends (12a, 12b; 32a, 32b; 220a, 220b) in the extending direction of the shaft; One end (12a; 32a; 220b) of the teeth has the first surface (1a; 3a; 200b), and the through hole (11; 31; 210) penetrates between the both ends.

  A tenth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to eighth aspects, wherein the first magnetic body (2) has the axis (P ) And a plurality of permanent magnets (22; 120) disposed along the circumferential direction, and a member (24; 25; 140) disposed between the permanent magnets adjacent in the circumferential direction. The member has the first surface (2b; 100a), and the through hole (21; 110) is provided in the member.

  An eleventh aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the tenth aspect, wherein the first magnetic body (2; 100) is the second magnetic body (3; 200). ) Side is further provided with a magnetic core (23; 130) in contact with the permanent magnet (22), and the member (24; 25; 140) and the magnetic core have the first surface (2b; 100a). The first surface of the member protrudes closer to the second magnetic body than the first surface of the magnetic core.

  A twelfth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the tenth aspect, wherein the first magnetic body (2; 100) is the second magnetic body (3; 200). ) Side is further provided with a magnetic core (23; 130) in contact with the permanent magnet (22), and the member (24; 25; 140) and the magnetic core are planar first surface (2b; 100a) Have

  A thirteenth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to twelfth aspects, wherein the second magnetic body (2) is the axis (P). A fourth surface (2b) located on the opposite side of the second surface (2a) in the extending direction of the first gap (2b), and the axial gap type rotating machine has a predetermined second air gap and the fourth surface (2b). And a third magnetic body (3) having a fifth surface (3a) facing each other, the third magnetic body penetrating through itself and opening on the fifth surface (second through-hole ( 31), and the interval of the second air gap in the extending direction of the shaft is measured via the second through hole.

  A fourteenth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to any one of the first to twelfth aspects, wherein the second magnetic body (2; 200) is the axis ( P) has a fourth surface (2b; 200b) located opposite to the second surface (2a; 200a) in the extending direction, and the axial gap type rotating machine includes the fourth surface (2b; 200b). ) And a third magnetic body (3; 300) having a fifth surface (3a; 300a) facing each other by forming a predetermined second air gap, and the second magnetic body includes the second surface and the fourth surface A second through hole (21; 210) penetrating between the first air gap and the second air gap is measured through the second through hole in the extending direction of the shaft.

  A fifteenth aspect of the air gap measuring method according to the present invention is the air gap measuring method according to the fourteenth aspect, wherein the first magnetic body (1; 100) and the second magnetic body (2; 200) Is relatively rotated about the axis (P), and the distance between the axis (P) and the position extending through the through hole (11; 110) and intersecting the second surface (2a; 200a) is The distance between the position of the second through hole (21; 210) on the second surface and the axis is different.

  A first aspect of a method of manufacturing an axial gap type rotating machine according to the present invention includes a first magnetic body (1; 2; 3; 100; 200) having a first surface (1a; 2b; 3a; 100a; 200b). And a second magnetic body (2; 3; 2) having a second surface (2a; 3a; 2b; 200a; 300a) and rotating relative to the first magnetic body around a predetermined axis (P). 200; 300), and the first magnetic body passes through itself and has a through hole (11; 21; 31; 110; 210) that opens on the first surface. (A) a step of causing the first surface and the second surface to face each other at a predetermined axis; and (b) after the execution of the step (a), through the through-hole. A step of measuring a distance between the first surface and the second surface in the extending direction; and (c) a step of fixing the distance after the execution of the step (b).

  A second aspect of the manufacturing method of the axial gap type rotating machine according to the present invention is the manufacturing method of the axial gap type rotating machine according to the first aspect, wherein the axial gap type rotating machine has a third surface (3a And a third magnetic body (3) that rotates relative to the second magnetic body (2) around the axis (P), and the third magnetic body passes through the third magnetic body (3). A second through hole (31) opening on the third surface, and (d) after the execution of the step (c), the second through hole on the opposite side of the second surface in the extending direction. A step of facing the fourth surface (2b) of the magnetic body and the third surface; and (e) after the execution of the step (d), in the extending direction via the second through hole. Measuring the distance between the third surface and the fourth surface; and (f) after performing the step (e), Further performing the step of fixing the distance between the fourth surface.

  A third aspect of the manufacturing method of the axial gap type rotating machine according to the present invention is a manufacturing method of the axial gap type rotating machine according to the first aspect, wherein the axial gap type rotating machine includes a third surface (1a And a third magnetic body (1) that rotates relative to the first magnetic body (2) around the axis (P), and the third magnetic body passes through the third magnetic body (1). A second through hole (11) opened on the third surface, and (d) after the execution of the step (c), the first magnetic body on the opposite side of the first surface in the extending direction. A step of facing the fourth surface (2a) of the second surface and the third surface; (e) after the execution of the step (d), through the second through hole, the second surface in the extending direction; Measuring the distance between the third surface and the fourth surface; and (f) after performing the step (e), the third surface and the fourth surface. Further performing the step of fixing the spacing of the surface.

  A first aspect of an axial gap type rotating machine according to the present invention is a plurality of annularly arranged around a predetermined axis (P) and having both ends (12a, 12b; 32a, 32b) in the extending direction of the axis. Teeth (12; 32; 220), and a field element (2; 300) arranged to form a predetermined air gap with one end of the plurality of teeth in the extending direction, At least one is provided with a through hole (11, 31, 210) penetrating between both ends in the extending direction.

  A second aspect of the axial gap type rotating machine according to the present invention includes a plurality of permanent magnets (22; 120) arranged along a circumferential direction centering on a predetermined axis (P) and adjacent to the circumferential direction in the circumferential direction. A member (24; 140) disposed between the matching permanent magnets, having both ends in the extending direction of the shaft, and provided with a through hole (21; 210) penetrating between the both ends; Teeth (12, 32, 120, 320) arranged to form a predetermined air gap with the permanent magnet in the extending direction.

  According to the first aspect of the air gap measuring method of the present invention, the distance between the first surface and the second surface is measured from the direction perpendicular to the predetermined axis to measure the air gap interval. When it is difficult, the gap of the air gap can be measured from the direction different from the direction through the through hole.

  According to the second aspect of the air gap measurement method of the present invention, it contributes to the realization of the air gap measurement method according to the first aspect.

  According to the third aspect of the air gap measurement method of the present invention, the first length can be easily measured.

  According to the 4th aspect of the air gap measuring method concerning this invention, it is easy to insert a gauge in a through-hole.

  According to the fifth aspect of the air gap measuring method of the present invention, an optical measuring instrument can be used, and the air gap interval can be measured in a short time.

  According to the 6th aspect of the air gap measuring method concerning this invention, the space | interval of an air gap can be measured directly.

  According to the seventh aspect of the air gap measurement method of the present invention, since a longer length is measured, the measurement accuracy can be improved.

  According to the 8th aspect of the air gap measuring method concerning this invention, since the space | interval of an air gap is measured through several through-holes, a measurement precision can be improved. Further, the present invention can be easily applied to an axial gap type rotating machine in which the air gap interval changes depending on the radial direction.

  According to the ninth aspect of the air gap measurement method of the present invention, it contributes to the execution of the air gap measurement method according to any one of the first to eighth aspects.

  According to the 10th aspect of the air gap measuring method concerning this invention, the fall of the magnetic flux density which a permanent magnet exhibits can be prevented compared with the case where a through-hole is provided in a permanent magnet.

  According to the 11th aspect of the air gap measuring method concerning this invention, the space | interval of the air gap in the position concerning a member is measured. Since the 1st surface concerning a member protrudes in the 2nd magnetic body side rather than the 1st surface concerning a magnetic body core, the space of the air gap concerning a magnetic body core is prevented from becoming smaller than a measurement result.

  According to the 12th aspect of the air gap measuring method concerning this invention, the space | interval of the air gap in the position concerning a member is measured. The first surface of the member is flush with the first surface of the magnetic core. Therefore, the air gap at the position on the magnetic core can improve the measurement accuracy.

  According to the thirteenth aspect of the air gap measurement method of the present invention, when it is difficult to measure the air gap interval and the second air gap interval from the direction perpendicular to the axis, The gap of the air gap and the gap of the second air gap can be measured from the direction through the through hole and the second through hole, respectively.

  According to the fourteenth aspect of the air gap measurement method of the present invention, when it is difficult to measure the air gap interval and the second air gap interval from the direction perpendicular to the axis, The gap of the air gap and the gap of the second air gap can be measured from the direction through the through hole and the second through hole, respectively.

  According to the fifteenth aspect of the air gap measuring method of the present invention, the position of the through hole on the first surface faces the position of the second through hole on the second surface in the extending direction of the through hole. Can be prevented.

  According to the first aspect of the manufacturing method of the axial gap type rotating machine according to the present invention, it is difficult to measure the distance between the first surface and the second surface from the direction perpendicular to the predetermined axis. Even if it exists, an axial gap type rotary machine can be manufactured, measuring the said space | interval via a through-hole from the direction different from the said direction.

  According to the second and third aspects of the method of manufacturing an axial gap type rotating machine according to the present invention, the distance between the first surface and the second surface and the third surface and the fourth surface from the direction perpendicular to the axis. Even if it is difficult to measure the distance between the first surface and the second surface from the direction different from the direction through the through hole and the second through hole, the third surface and the second surface An axial gap type rotating machine can be manufactured while measuring the distance to each of the four surfaces.

  According to the first and second aspects of the axial gap type rotating machine according to the present invention, even if it is difficult to measure the gap of the air gap from the direction perpendicular to the axis, The distance of the air gap in the extending direction of the shaft can be measured.

First embodiment.
A first embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a conceptual perspective view showing an example of an internal configuration of an axial gap type rotating machine (hereinafter referred to as a rotating machine) separated along a rotation axis. FIG. 2 is a side view of the rotating machine shown in FIG. 1 taken along the line AA, and shows a conceptual configuration diagram of a finished product of the rotating machine. FIG. 3 shows a cross section of a part of the rotating machine in the circumferential direction passing through a through hole 11 (described later) shown in FIG.

  First, the internal configuration of the rotating machine will be described, and then the finished product will be described.

  1 to 3, the rotating machine includes stators 1 and 3 and a rotor 2. The stator 1, the rotor 2, and the stator 3 are arranged in this order along the rotation axis P. Referring to FIG. 3, stator 1 has a surface 1 a and a surface 1 b located on the opposite side of surface 1 a in the extending direction of rotation axis P (hereinafter referred to as axis P direction). The rotor 2 has a surface 2a that faces the surface 1a in the axis P direction and a surface 2b that is located on the opposite side of the surface 2a in the axis P direction. The stator 3 has a surface 3a that faces the surface 2b in the axis P direction and a surface 3b that is located on the opposite side of the surface 3a in the axis P direction.

  The surfaces 1a and 2a form a first air gap, and the surfaces 2b and 3a form a second air gap.

  1 to 3, the stator 1 includes a through hole 11, a plurality of (here, twelve) teeth 12, a back yoke 13, and an armature winding 14.

  The back yoke 13 has, for example, an annular shape having a peripheral edge around the rotation axis P, and has a surface 1b.

  The plurality of teeth 12 are annularly arranged around the rotation axis P, and each of the plurality of teeth 12 has both ends 12a and 12b in the axis P direction. The plurality of teeth 12 are provided on the surface of the back yoke 13 located on the opposite side of the surface 2 b, and the ends 12 b are connected to each other by the back yoke 13. An end 12a of the tooth 12 has a surface 1a. The teeth 12 may have a bowl shape on the end 12a side.

  The teeth 12 and the back yoke 13 are made of a magnetic material having a high magnetic permeability (for example, iron), and have a high specific resistance in a direction at least perpendicular to the flow of magnetic flux in order to reduce eddy current loss. . The teeth 12 and the back yoke 13 can be composed of, for example, a dust core or an electromagnetic steel plate. In addition, the part which consists of teeth 12 and the back yoke 13 can be grasped | ascertained as the magnetic body which has the surfaces 1a and 1b.

  The through hole 11 passes through the stator 1 and opens on the surface 1a. More specifically, the through hole 11 penetrates the back yoke 13 and the tooth 12 in the axis P direction between the surfaces 1a and 1b, for example. In addition, it can also be grasped that the through hole 11 penetrates the teeth 12 between both ends 12a and 12b. The through hole 11 is desirably as small as possible so as not to obstruct the magnetic path inside the tooth 12.

  At least one through hole 11 is provided in the circumferential direction around the rotation axis P (hereinafter simply referred to as “circumferential direction”). In FIG. 1, four through holes 11 are provided at substantially equal intervals in the circumferential direction. By setting the intervals to be approximately equal, it is possible to reduce the influence of the magnetic imbalance due to the presence or absence of the through holes on the rotational force.

  When the teeth 12 and the back yoke 13 are made of, for example, a dust core, the through holes 11 may be provided when forming these shapes, or the shapes may be formed without including the shapes of the through holes 11. The through holes 11 may be provided later by processing. Moreover, when the teeth 12 are composed of, for example, electromagnetic steel plates laminated in the radial direction, the through holes 11 can be formed by several electromagnetic steel plates separated in the circumferential direction.

  Although the armature winding 14 is shown separated from the tooth 12 in FIG. 1, the armature winding 14 is actually wound around the tooth 12 around an axis parallel to the rotation axis P as shown in FIG. 2. In FIGS. 1 and 2, the armature winding 14 is wound around the tooth 12 by concentrated winding, but is not limited thereto, and may be wound by distributed winding.

  Unless otherwise specified in the present application, the armature winding does not indicate each of the conductive wires constituting the armature winding, but indicates an aspect in which the conductive wires are wound together. The same applies to the drawings. In addition, the drawing lines at the start and end of winding and their connection are also omitted in the drawings.

  The rotor 2 includes a plurality (eight in this case) of permanent magnets 22, magnetic cores 23 and 24, and a nonmagnetic holder 25. In FIG. 1, the nonmagnetic holder 25 is omitted. The nonmagnetic holder 25 will be described later.

  The plurality of permanent magnets 22 are magnetized in the direction of the axis P, arranged along the circumferential direction, and exhibit different magnetic poles alternately in the circumferential direction.

  The magnetic core 23 is a magnetic body (for example, iron) having a high magnetic permeability, and is provided on both sides of the permanent magnet 22 in the axis P direction. The magnetic core 23 can be composed of, for example, a dust core. The magnetic core 23 has a part of the surfaces 2a and 2b on the surface opposite to the permanent magnet 22, respectively. It can be understood that the magnetic core 23 on the stator 1 side contacts the permanent magnet 22 on the stator 1 side in the axis P direction, and the magnetic core 23 on the stator 3 side is permanent on the rotor 2 side in the axis P direction. It can be grasped when in contact with the magnet 22.

  Although the magnetic core 23 is not an essential constituent element, it prevents demagnetization of the permanent magnet 22 and reduces eddy current generated in the permanent magnet 22 if the permanent magnet 22 is sintered neodymium. be able to. In the embodiment in which the magnetic core 23 is not provided, the surface of the permanent magnet 22 on the stator 1 side is a part of the surface 2a, and the surface of the stator 3 side is a part of the surface 2b. The permanent magnet 22 is a magnetic body, and the surface thereof is a part of the surfaces 2a and 2b.

  The magnetic core 24 is a magnetic body (for example, iron) with high magnetic permeability, and is disposed between the permanent magnets 22 adjacent in the circumferential direction. The magnetic core 24 can be composed of, for example, a dust core or electromagnetic steel plates laminated in the radial direction. The magnetic core 24 has surfaces 2a and 2b. Although the magnetic core 24 is not an essential requirement, since the q-axis inductance can be improved, the reluctance torque generated due to the difference between the q-axis inductance and the d-axis inductance can be used in accordance with the magnet torque. it can.

  Further, it is desirable that the surface 2a applied to the magnetic core 23 and the surface 2a applied to the magnetic core 24 are the same plane. However, since the magnetic cores 23 and 24 are formed separately from each other, the same plane is realized. It is difficult. In this case, it is desirable that the surface 2 a applied to the magnetic core 24 protrudes toward the stator 1 as compared with the surface 2 a applied to the magnetic core 23. The same applies to the surface 2b applied to the magnetic core 24 and the surface 2b applied to the magnetic core 23. In FIG. 3, the steps of the magnetic cores 23 and 24 in the direction of the axis P are exaggerated. This point will be described later.

  The stator 3 includes a through hole 31, a plurality of teeth 32, a back yoke 33, and an armature winding 34. Since the stator 3 has the same shape as the stator 1, detailed description thereof is omitted.

  Next, a finished product of the rotating machine will be described with reference to FIG. The stators 1 and 3 and the rotor 2 are accommodated in a case including an upper surface portion 51, a lower surface portion 52, and a side surface portion 53.

  The shaft 5 is fixed to an upper surface portion 51 and a lower surface portion 52 having bearings, respectively, so as to be rotatable about the rotation axis P. Further, the stator 1, 3 and the rotor 2 are penetrated in a region including the rotation axis P.

  The rotor 2 is fixed to the shaft 5 between the upper surface portion 51 and the lower surface portion 52. More specifically, for example, the non-magnetic holder 25 fixes the permanent magnet 22 and the magnetic cores 23 and 24 to each other, and the rotor 2 is fixed to the shaft 5 by shrink fitting or the like.

  The stator 1 is fixed between the upper surface portion 51 and the rotor 2, and the stator 3 is fixed between the rotor 2 and the lower surface portion 52 with the side surface portion 53, for example, by shrink fitting.

  A method for measuring the distance between the first air gaps composed of the surfaces 1a and 2a and the second air gap composed of the surfaces 2b and 3a in the rotating machine having such a configuration will be described. FIG. 4 is a view for explaining an air gap measurement method when measuring the first air gap during or after assembly of the rotating machine.

  First, in step S11, the stator 1 is fixed to the side surface portion 53 to which the upper surface portion 51 is attached. Next, in step S12, the shaft 5 to which the rotor 2 is attached is inserted into the stator 1 and the upper surface portion 51 in this order, so that the stator 1 faces the rotor 2 in the axis P direction. Let Then, the shaft 5 and the upper surface portion 5 are rotatably fixed, and the rotor 2 is fixed to the stator 1.

  Next, in step S13, an interval between the surface 1a and the surface 2a in the direction of the axis P (hereinafter referred to as an interval of the first air gap) is measured via the through hole 11.

  More specifically, for example, as shown in FIG. 5, the gauge 4 is inserted into the through hole 11 from the surface 1 b side, and the gauge 4 is stopped in contact with the surface 2 a applied to the magnetic core 23, for example. Then, the gauge 4 is read to measure the length L1 between the surfaces 1b and 2a. Note that this step can be understood as measuring the length from the surface 1b to the surface 2a via the through hole 11.

  In addition, as shown in FIG. 6, the through-hole 11 may have a tip shape on the surface 1b side. In this case, it is easy to insert the gauge 4 into the through hole 11 from the surface 1b side. On the other hand, it is desirable that the surface 1a side does not have a thick shape. This is because the through-hole 11 hardly obstructs the flow of magnetic flux inside the back yoke 13 in the vicinity of the surface 1b side, but prevents the flow of magnetic flux inside the tooth 12 on the surface 1a side.

  Then, referring to FIG. 5 again, the distance between the first air gaps is measured by subtracting the length L2 between the surfaces 1a and 1b in the axis P direction from the measured length L1. For the length L2, for example, a design value of the rotor 2 manufactured with high accuracy in advance may be used. In addition, when the permanent magnet 22 is already magnetized, it is good to measure, for example using the gauge 4 of a nonmagnetic material.

  It is not essential to measure the distance of the first air gap using the gauge 4. For example, as shown in FIGS. 7 and 8, the optical path length of the light passing through the through hole 11 is measured by the optical measuring instrument 41. You may measure the space | interval of 1 air gap.

  More specifically, for example, as shown in FIG. 7, the light from the optical measuring instrument 41 is incident on the through hole 11 from the surface 1 b side, and the light reflected by the surface 2 a is received through the through hole 11. The length L3 from the optical measuring instrument 41 to the surface 2a is measured. Subsequently, as shown in FIG. 8, the surface 1b is irradiated with the light from the optical measuring instrument 41, the light reflected by the surface 1b is received, and the length L4 from the optical measuring instrument 41 to the surface 1b is measured. To do. The length between the optical measuring instrument 41 and the stator 1 in the axis P direction when measuring the length L3 is the same as that between the optical measuring instrument 41 and the stator in the axis P direction when measuring the length L4. The length between 1 is the same. Further, either the measurement of the length L3 or the measurement of the length L4 may be performed first or may be performed simultaneously.

  Then, the length L1 is measured by subtracting the length L4 from the length L3. In this step, it can be understood that the length from the surface 1b to the surface 2a is measured via the through hole 11. In this case, since the optical measuring instrument 41 is used, the interval between the first air gaps can be measured in a short time.

  Alternatively, the first air gap may be measured via the through hole 11 by rotating the rotor 2 so that the through hole 11 is positioned on the surface 1 a of the magnetic core 24. In this case, since the surface 1a applied to the magnetic core 24 protrudes to the stator 1 side from the surface 1a applied to the magnetic core 23, the interval of the first air gap applied to the magnetic core 23 is shorter than the measured value. Can be prevented.

  When a plurality of (for example, four) through-holes 11 are provided, the interval between the first air gaps may be measured at a plurality of locations via each of the plurality of through-holes 11.

  Next, in step S14, it is determined whether or not the measured value (first air gap interval) is within a specified range.

  If the result of determination in step S14 is within the specified range, it is determined in step S15 that the product is non-defective. If it exceeds the specified range, it is determined in step S16 that the product is defective. In step S13, if the intervals of the first air gap are measured at a plurality of locations via each of the plurality of through holes 11, whether or not each of the plurality of measured values is within a specified range in step S14. If all the measured values are within the specified range, it is determined to be non-defective in step S15, and if any one measured value exceeds the specified range, it is determined to be defective in step S16. May be.

  Further, in step S13, for example, the rotor 2 may be rotated to measure the intervals of the first air gap at a plurality of locations per one through hole 11. In this case, the accuracy of the measurement result can be improved. A reference mark may be attached to the rotor 2 or the shaft 5 so that the measurement location can be grasped in advance.

  A method for measuring the interval of the second air gap will be briefly described. For example, after the steps S11 to 16 are executed to fix the stator 1 and the rotor 2, the stator 3 is made to face the rotor 2 through the shaft 5. That is, the surfaces 2b and 3a face each other in the axis P direction. Then, the stator 3 is fixed to the side surface portion 53. Thereafter, the same steps as steps S13 to S16 are executed to measure the interval of the second air gap. However, the interval of the second air gap is measured via the through hole 31 from the side opposite to the rotor 2 (surface 3b side) when viewed from the stator 3.

  As described above, for example, even when it is difficult to measure the gap of the air gap from the direction perpendicular to the rotation axis P by the side surface portion 53, the gap of the air gap is measured from a direction different from the direction. be able to.

  Note that a through hole 51 a penetrating the upper surface portion 51 may be provided in a portion that extends through the through hole 11 and overlaps the upper surface portion 51 (see FIG. 2). In this case, after manufacturing the rotating machine, the first air gap can be measured through the through hole 51a and the through hole 11 in the same manner as in step S13. The same applies to the lower surface portion 52.

  The through hole 11 may be inclined with respect to the rotation axis P. FIG. 9 is a cross-sectional view of the stator 1 and the rotor 2 in the circumferential direction passing through the through hole 11 when the through hole 11 is inclined with respect to the rotation axis P.

  Referring to FIG. 9, the through hole 11 is inclined with respect to the rotation axis P by an angle θ (0 ° <θ <90 °). The length L1 'obtained by reading the gauge 4 inserted into the through hole 11 and in contact with the surface 1a is L1' = L1 / cos θ. Therefore, the length L1 can be obtained by L1 = L1 ′ · cos θ.

  For example, when the measurement error of the gauge 4 is ΔL, the error ΔL1 for the length L1 is expressed by ΔL1 = ΔL · cos θ. Therefore, the measurement accuracy of the length L1 can be improved as compared with the case where the through hole 11 is parallel to the rotation axis P (when θ = 0 °). As a result, the measurement precision of the space | interval of a 1st air gap can be improved. In other words, the measurement accuracy can be improved because the longer length L2 'is measured. If the through hole 11 is parallel to the rotation axis P, the length L1 can be directly measured without calculation.

  Further, a plurality of through holes 11 may be provided in a radial direction around the rotation axis P (hereinafter referred to as a radial direction). FIG. 10 is a conceptual perspective view of the stator 1 when a plurality of through holes 11 are provided in the radial direction. FIG. 11 is a conceptual view of the radial direction passing through the through holes 11 in the stator 1 shown in FIG. FIG.

  In this case, since the interval of the first air gap can be measured at a plurality of locations in the radial direction in step S13, the measurement accuracy can be improved. In terms of measurement accuracy, the through holes 11 in the radial direction are preferably separated from each other. The first embodiment can also be applied to a rotating machine in which the first air gap varies depending on the radial direction.

  In the air gap measurement method described above, the design value of the stator 1 manufactured with high accuracy in advance is used as the length L2, and the distance between the first air gaps is measured using the length L2. Not limited to. The length L2 of the surfaces 1a and 1b in the stator 1 may be measured, and the distance of the air gap may be measured by subtracting the length L2 from the length L1. FIG. 12 is a flowchart for explaining the air gap measurement method in this case.

  Steps S22, S23, and S25 to S27 are the same as steps S11, S12, and S14 to S16, respectively.

  Before fixing the stator 1 (execution of step S22), in step S21, the length L2 between the surfaces 1a and 1b in the axis P direction is measured. In this measurement, referring to FIG. 5, for example, the stator 1 is placed on a base having a predetermined reference surface so that the surface 1a is in contact with the reference surface, and a gauge is inserted into the through-hole 11 so that the reference is made from the surface 1b. This can be done by measuring the length to the surface.

  When the through hole 11 is inclined with respect to the rotation axis P, the length L2 ′ is measured via the through hole 11 with reference to FIG. 9, and the length is expressed by L2 = L2 ′ · cos θ. What is necessary is just to measure L2. In this case, the measurement accuracy of the length L2 can be improved, and consequently the measurement accuracy of the first air gap can be improved.

  And after fixing the stator 1 and the rotor 2 (execution of step S22, S23), in step S24, the length L1 is measured via the through-hole 11 similarly to step S13, The said length L1 From this, the distance of the first air gap is measured by subtracting the length L2 measured in step S21.

  As described above, since the length L2 is actually measured, the measurement accuracy can be improved.

  Next, the aspect which manufactures a rotary machine, applying this air gap measurement method and measuring an air gap is demonstrated. FIG. 13 is a flowchart showing an example of the manufacturing process of the rotating machine.

  First, in step S31, the stator 1 is fixed to the side surface portion 53 to which the upper surface portion 51 is attached, and the rotor 2 is fixed to the shaft 5. Next, in step S32, the shaft 5 is inserted into the stator 1 and the upper surface portion 51 so that the surfaces 1a and 2a face each other in the axis P direction. In other words, the rotor 2 is positioned with respect to the stator 1.

  Next, in step S <b> 33, the interval of the first air gap is measured via the through hole 11. Step S33 is executed in the same manner as step S13.

  Next, in step S34, it is determined whether or not the measured value (first air gap interval) is within a specified range. If it is not within the specified range, step S32 is executed again. At this time, in step S32, the rotor 2 (more specifically, the shaft 5) is moved and positioned in a direction in which the interval of the first air gap falls within a specified range.

  If the result of determination in step S34 is within the specified range, in step S35, the shaft 5 is rotatably fixed to the upper surface portion 51, and the rotor 2 is fixed to the stator 1. This step can be grasped as a step of fixing the distance between the surface 1a and the surface 2a.

  When fixing the stator 3 while measuring the second air gap, for example, after the stator 1 and the rotor 2 are fixed by executing steps S31 to 35, the stator 3 is connected via the shaft 5. It faces the rotor 2. That is, the surfaces 2b and 3a face each other in the axis P direction. Thereafter, the same steps as steps S32 to S35 are executed, and the stator 3 is fixed to the side surface portion 53 while measuring the interval of the second air gap via the through hole 31. If the lower surface portion 54 is attached to the side surface portion 53, an axial gap type rotating machine can be completed.

  As described above, for example, even when it is difficult to measure the air gap from the direction perpendicular to the rotation axis P by the side surface portion 53, the rotating machine is measured while measuring the air gap from a direction different from the direction. Can be manufactured.

  The above-described development of the through-hole can be applied to a method of manufacturing a rotating machine while measuring the air gap shown in FIG. The effects exhibited in that case are as described above.

  In the present embodiment, the rotating machine includes the stators 1 and 3 and the rotor 2, but is not limited thereto, and may include the stator 1 and the rotor 2.

Second embodiment.
A second embodiment according to the present invention will be described with reference to the drawings. In addition, the same code | symbol shows the same or an equivalent part, and the overlapping description is abbreviate | omitted.

  In the first embodiment, the distance between the first air gap and the distance between the second air gaps are measured from the side opposite to the rotor 2 via the through holes 11 and 31, respectively. For example, there may be a case where a compression mechanism or the like is disposed on the side opposite to the rotor 2 as viewed from the stator 3 and it is difficult to measure the second air gap via the through hole 31 by the compression mechanism. Therefore, in the second embodiment, the interval of the second air gap is measured from the stator 1 side as viewed from the stator 3.

  FIG. 14 is a conceptual perspective view showing an example of the internal configuration of the rotating machine, and FIG. 15 is a side view of the BB cross section shown in FIG. 14 and is a conceptual view of a hermetic compressor equipped with the rotating machine. This is a schematic diagram.

  Compared with FIG. 14 and FIG. 1, the main difference between the rotating machine according to the first embodiment and the rotating machine according to the second embodiment is that the rotor 2 has a through hole 21. The stator 3 does not have the through hole 31. 14 and 15, a plurality of through holes 11 and 21 are provided in the radial direction, but at least one or more may be provided as in the first embodiment.

  The through hole 21 is provided in the magnetic core 24. More specifically, the through hole 21 passes through the magnetic core 24 between the surfaces 2 a and 2 b applied to the magnetic core 24. It can be understood that the rotor 2 has a through-hole 21 that penetrates through the rotor 2 and opens on the surface 2a.

  Although the through hole 21 is not necessarily provided in the magnetic core 24, the magnetic flux density exhibited by the permanent magnet 22 is reduced as compared with the case where the through hole 21 is provided in the magnetic core 23 and the permanent magnet 22. Can be prevented. Further, the through hole 21 may be provided in the nonmagnetic holder 25.

  Referring also to FIG. 15, the distance between the rotation axis P and the position extending through the through hole 11 and intersecting the surface 2 a is different from the distance between the through hole 21 on the surface 2 a and the rotation axis P. This is not an essential requirement, but it is possible to prevent the position of the through hole 11 on the surface 1a and the position of the through hole 21 on the surface 2a from facing each other in the extending direction of the through hole 11. Therefore, when measuring the first air gap, for example, a gauge inserted into the through hole 11 can be prevented from being inserted into the through hole 21, and the first air gap can be measured more reliably.

  The hermetic compressor includes a casing 6 including a lid 65, a side surface 64, and a base 66, a suction port 61, a discharge port 62, a compression mechanism 63, stators 1 and 3, a rotor 2, and a shaft 5. Equipped with a rotating machine.

  The compression mechanism 63 is disposed facing the rotating machine in the direction of the axis P, and is connected to the shaft 5. The casing 6 encloses and stores the compression mechanism 63 and the rotating machine. For example, the suction port 61 is provided in the lid 65, and the discharge port 62 is provided in the side surface portion 64 at a position adjacent to the compression mechanism 63.

  Next, a method for assembling the rotary machine in the hermetic compressor while measuring the air gap will be described. FIG. 16 is a flowchart illustrating an example of a manufacturing process when a rotary machine is mounted on a hermetic compressor.

  After mounting the compression mechanism 63 in the side surface portion 64 attached to the base 66 and attaching the shaft 5 to the compression mechanism 63, the stator 3 is fixed to the side surface portion 64 of the casing 6 in step S41. Next, in step S42, the rotor 2 is positioned with respect to the stator 3, and the surfaces 2b and 3a are opposed to each other in the axis P direction.

  Next, in step S43, the interval of the second air gap is measured via the through hole 21. FIG. 17 is a cross-sectional view in the circumferential direction passing through the through hole 21 in the rotor 2 and the stator 3 shown in FIG. Similar to the first embodiment, for example, the gauge 4 is inserted into the through hole 21 from the surface 2a side, and the second air gap is measured. More specifically, the lengths of the surfaces 2a and 3a in the direction of the axis P are measured, and the second air gap is measured by subtracting the lengths of the surfaces 2a and 2b applied to the magnetic core 24 from the measured length. To do. The lengths of the surfaces 2a and 2b may be the design values of the rotor 2 manufactured with high accuracy in advance.

  Similarly to the first embodiment, if the surface 2b applied to the magnetic core 24 protrudes toward the stator 3 from the surface 2b applied to the magnetic core 23, the second air gap applied to the magnetic core 23. Can be prevented from becoming shorter than the measured value.

  Next, in step S44, it is determined whether or not the measured value (second air gap interval) is within a specified range. If it is not within the specified range, step S42 is executed again. At this time, in step S42, the rotor 2 is moved and positioned in a direction in which the interval of the second air gap falls within a specified range. If it is within the specified range, the rotor 2 is fixed to the shaft 5 in step S45.

  Next, Steps S46 to S49 are executed to fix the stator 1 to, for example, the side surface portion 64 while measuring the first air gap. Since steps S46 to S49 are the same as steps S32 to S35 according to the first embodiment, detailed description thereof is omitted.

  As described above, it is difficult to measure the distance between the first air gap and the second air gap from the direction perpendicular to the rotation axis P by the side surface portion 64, and for example, opposite to the rotor 2 when viewed from the stator 3. Even if the compression mechanism 63 is arranged on the side and it is difficult to measure the distance of the second air gap from the stator 3 side, the first air gap and the second air gap from different directions. The rotating machine can be mounted on the hermetic compressor while measuring the interval.

  FIG. 18 is a flowchart showing another example of the manufacturing process when a rotary machine is mounted on a hermetic compressor. In this example, the air gap measurement method described with reference to FIG. 12 in the first embodiment is applied to the manufacturing process described with reference to FIG.

  Only the difference will be described. Before the positioning of the rotor 2 (execution of step S54), the lengths of the surfaces 2a and 2b of the rotor 2 are measured in step S52, and the positioning of the stator 1 (execution of step S58). Prior to step S53, the lengths of the surfaces 1a and 1b of the stator 1 are measured. In steps S55 and S59, the distance between the first air gap and the second air gap is measured using the lengths of the surfaces 2a and 2b and the lengths of the surfaces 1a and 1b measured in steps S52 and S53, respectively. ing.

  Since the actual lengths of the surfaces 2a and 2b and the lengths of the surfaces 1a and 1b are measured, the measurement accuracy of the first air gap and the second air gap can be improved.

  Note that an optical measuring instrument may be used instead of a gauge for measuring the gap of the air gap, and the through holes 11 and 21 may have a tapered shape on the surfaces 1b and 2a, respectively. It may be inclined with respect to it. Further, the air gap may be measured at a plurality of positions via each of the plurality of through holes, or the rotor 2 may be rotated per one through hole and measured at a plurality of positions. The stator 1 and the rotor 2 may be fixed when all the measured air gap intervals are within a specified range. The effects exhibited in these cases are the same as those in the first embodiment.

Third embodiment.
A third embodiment according to the present invention will be described with reference to the drawings. In the first embodiment and the second embodiment, since the magnetic cores 23 and 24 are configured separately from each other, for example, the surface 2a over the magnetic core 23 and the magnetic core 24 It was difficult to make the surface 2a coplanar. The same was true for the surface 2b. In the third embodiment, these are configured on the same plane.

  A specific example will be described by describing differences from the second embodiment. FIG. 19 is a conceptual perspective view in which an example of the rotor 2 is separated in the axis P direction. FIG. 20 is a conceptual cross-sectional view in the circumferential direction at a position passing through the through hole 21 in the rotor 2 shown in FIG. FIG. 20 also shows a cross section of the stator 3 in the circumferential direction at a position passing through the through hole 21.

  The magnetic cores 23 and 24 are integrally formed, for example, by connecting one end opposite to the rotation axis P in the circumferential direction. The magnetic cores 23 and 24 have planar surfaces 2a and 2b. Since the magnetic cores 23 and 24 are integrally formed, the surface 2a (2b) applied to the magnetic core 23 and the surface 2a (2b) applied to the magnetic core 24 can be easily set on the same plane. In addition, it is desirable that the portion connecting the magnetic cores 23 and 24 has a short radial length. This is to reduce a short circuit (leakage magnetic flux) between the permanent magnets 22.

  Referring to FIG. 20, since the surface 2 b applied to the magnetic core 23 and the surface 2 b applied to the magnetic core 23 are planar, the interval between the second air gaps at the position applied to the magnetic core 23, and the magnetic core The distance between the second air gaps at the position of 24 is substantially the same. Therefore, it is possible to improve the measurement accuracy of the interval of the second air gap. In addition, since the surface 2a applied to the magnetic core 23 and the surface 2a applied to the magnetic core 24 are planar, it is possible to accurately measure the distance between the first air gaps at any position applied to the magnetic cores 23 and 24. .

  Referring to FIG. 19, the rotor 2 includes a connecting portion 26 that connects one ends of the magnetic core 23 on the rotating shaft P side in the circumferential direction. The connecting portion 26 is also formed integrally with the magnetic cores 23 and 24. The connecting portion 26 is provided with an insertion hole for inserting the shaft. As a result, a non-magnetic material for fixing the rotor 2 to the shaft can be eliminated, and the manufacturing cost can be reduced.

  In addition, since the first air gap and the second air gap are substantially the same at any position of the magnetic cores 23 and 24, the thrust force and rotational force imbalance of the rotating machine can be reduced.

  FIG. 21 is a conceptual perspective view in which another example of the rotor 2 is separated in the direction of the axis P. FIG. 22 is a conceptual view in the circumferential direction passing through the through hole 21 in the rotor 2 shown in FIG. It is sectional drawing. FIG. 22 also shows a cross section of the stator 3 in the circumferential direction at a position passing through the through hole 21.

  20 and 22, the rotor 2 further includes a connecting portion 27 that connects the magnetic cores 23 and 24 on the surface 2a side and the surface 2b side, respectively. The magnetic cores 23 and 24 and the connecting portion 27 are integrally formed over the entire circumference in the circumferential direction. The magnetic cores 23 and 24 and the connecting portion 27 on the stator 1 side have a flat surface 2a, and the magnetic cores 23 and 24 and the connecting portion 27 on the stator 3 side have a flat surface 2b. is doing. Therefore, the measurement accuracy of the interval between the first air gap and the second air gap can be improved.

  Since the magnetic cores 23 and 24 and the connecting portion 27 are integrally formed over the entire circumference, the magnetic resistance becomes uniform, thereby further reducing the cogging torque.

  It is desirable that the connecting portion 27 in the axis P direction is sufficiently thin. This is to prevent a short circuit between the permanent magnets 22.

  In addition, the rotor of the aspect which does not provide the through-hole 21 in this rotor 2 can also be applied to 1st Embodiment. Even in this case, the accurate first air gap interval can be measured at any position on the magnetic cores 23 and 24, and the accurate second air gap interval can be measured at any position as well. . Also, the cogging torque can be reduced.

Fourth embodiment.
A fourth embodiment according to the present invention will be described. In the first to third embodiments, the stators 1 and 3 are arranged on both sides of the rotor 2, respectively. In the fourth embodiment, the rotors are arranged on both sides of the stator. Is done.

  FIG. 23 is a conceptual configuration diagram of an example of a rotating machine partially shown in the axis P direction. The rotating machine includes rotors 100 and 300 and a stator 200.

  FIG. 24 is a cross-sectional view of the rotor 100 and the stator 200 in the circumferential direction passing through the through hole 110 (described later). FIG. 25 is a cross-sectional view of the stator 200 and the rotor 300 in the circumferential direction passing through a through hole 210 (described later).

  24 and 25, the rotor 100 has a surface 100a and a surface 100b located on the opposite side of the surface 100a in the axis P direction. The stator 200 has a surface 200a facing the surface 100a in the axis P direction, and a surface 200b located on the opposite side of the surface 200a in the axis P direction. The rotor 300 has a surface 300a that faces the surface 200b in the axis P direction, and a surface 300b that is located on the opposite side of the surface 300a in the axis P direction.

  The rotor 100 includes a through hole 110, a permanent magnet 120, magnetic cores 130 and 140, and a back yoke 150. As shown in FIGS. 23 and 24, the rotor 100 is substantially the same as the rotor 2 shown in FIG. The difference is that the rotor 100 includes a back yoke 150 that contacts the permanent magnet 120 on the opposite side of the stator 200. The back yoke 150 is a magnetic material.

  The magnetic cores 130 and 140 have a surface 100 a on the stator 200 side, and the back yoke 150 has a surface 100 b on the opposite side to the stator 200. The magnetic cores 130 and 140 are not essential requirements. When the magnetic core 140 is not provided, the surface of the permanent magnet 120 on the stator 200 side is the surface 100a. The permanent magnet 120 is a magnetic body, and its surface becomes a part of the surface 100a.

  The through hole 110 passes through the rotor 100 and opens on the surface 100a. Specifically, for example, the back yoke 150 and the magnetic core 140 are penetrated between the surfaces 100a and 100b.

  The stator 200 includes a through hole 210, a plurality of teeth 220, and an armature winding 240. The stator 200 is substantially the same as the stator 1 shown in FIG. The difference is that no back yoke is provided. Although the teeth 220 are shown separated from each other, they are actually fixed to each other by a mold or the like.

  The tooth 220 has both ends 220a and 220b in the axis P direction, and the both ends 220a and 220b have surfaces 200a and 200b, respectively. The teeth 220 can be grasped as a magnetic body having the surfaces 200a and 200b.

  The through hole 210 passes through the stator 200 and opens on the surface 200b. More specifically, the through hole 210 penetrates the teeth 220 between both ends 220a and 220b (surfaces 200a and 200b).

  Similar to the first and second embodiments, the through holes 110 and 210 may be parallel to the rotation axis P or may be inclined with respect to the rotation axis P. Further, a plurality of circumferential and radial directions may be provided. These effects are the same as those of the first and second embodiments.

  The rotor 300 includes a permanent magnet 320, magnetic cores 330 and 340, and a back yoke 350. Since the configuration of the rotor 300 is the same as that of the rotor 100 except that the through hole is not provided, detailed description thereof is omitted.

  In such a rotating machine, as in the second embodiment, the distance between the third air gaps composed of the surfaces 200b and 300a can be measured via the through hole 210, and the surfaces 100a and 100a can be measured via the through hole 110. The distance of the fourth air gap consisting of 200a can be measured.

  Note that, as in the first embodiment, the rotor 300 may be provided with a through hole 310.

  In the first to fourth embodiments, the axial gap type rotating machine using a permanent magnet has been described. However, the present invention is not limited to this, and the present invention can also be applied to an embodiment using no permanent magnet.

It is a notional perspective view which shows an example of the internal structure of the axial gap type rotary machine which concerns on 1st Embodiment. It is a side view in the AA cross section of the rotary machine shown in FIG. 1, Comprising: It is a notional block diagram of the completed product of a rotary machine. FIG. 2 is a partial cross-sectional view in the circumferential direction of the rotating machine shown in FIG. 1. It is a flowchart for demonstrating the air gap measuring method. It is a figure which shows the aspect which measures an air gap using a gauge. It is a figure which shows the aspect which measures an air gap using a gauge. It is a figure which shows the aspect which measures an air gap using an optical measuring device. It is a figure which shows the aspect which measures an air gap using an optical measuring device. It is a figure which shows the aspect which measures an air gap using a gauge. It is a notional perspective view of a stator. It is sectional drawing of the radial direction of the stator shown in FIG. It is a flowchart for demonstrating the air gap measuring method. It is a flowchart which shows the process of manufacturing a rotary machine, measuring an air gap. It is a notional perspective view which shows an example of the internal structure of the axial gap type rotary machine which concerns on 2nd Embodiment. It is a side view in the BB cross section shown in FIG. 14, Comprising: It is a notional block diagram of the hermetic type compressor carrying the rotary machine shown in FIG. It is a flowchart which shows the process of incorporating a rotary machine, measuring an air gap. It is a figure which shows the aspect which measures an air gap using a gauge. It is a flowchart which shows the process of incorporating a rotary machine, measuring an air gap. It is a notional perspective view showing an example of a stator which an axial gap type rotating machine concerning a 3rd embodiment has. FIG. 21 is a conceptual perspective view showing an example of the stator shown in FIG. 20. It is a notional perspective view which shows another example of the stator which the axial gap type rotary machine which concerns on 3rd Embodiment has. It is a conceptual perspective view which shows an example of the stator shown in FIG. It is a conceptual perspective view which shows an example of the axial gap type rotary machine which concerns on 4th Embodiment. It is sectional drawing in the circumferential direction of the one rotor and stator shown in FIG. It is sectional drawing in the circumferential direction of the one rotor and stator shown in FIG.

Explanation of symbols

1-3, 100, 200, 300 Magnetic body 1a, 1b, 2a, 2b, 3a, 3b, 100a, 100b, 200a, 200b, 300a, 300b Surface 4 gauge 11, 21, 31, 110, 210, 310 Through hole 12, 32, 220 Teeth 13, 14, 33, 34, 130, 140, 330, 340 Magnetic core 12a, 12b, 32a, 32b, 220a, 220b End L1, L2 Length

Claims (20)

A first magnetic body (1; 2; 3; 100; 200) having a first surface (1a; 2b; 3a; 100a; 200b) and a second surface facing the first surface at a predetermined axis (P) A second magnetic body (2; 3; 2; 200; 300) having (2a; 3a; 2b; 200a; 300a), the first magnetic body penetrating through itself and opening on the first surface In an axial gap type rotating machine having through holes (11; 21; 31; 110; 210) that measure the distance of the air gap between the first surface and the second surface in the extending direction of the shaft An air gap measuring method
An air gap measuring method of measuring the interval via the through hole. The first magnetic body (1; 2; 3; 100,200) is a third surface located opposite to the first surface (1a; 2b; 3a; 100a; 200a) in the extending direction of the axis (P). (1b; 2a; 3b; 100b; 200a)
The through hole (11; 21; 31; 110; 210) penetrates the first magnetic body from the third surface toward the first surface;
Measure the first length (L1) from the third surface to the second surface (2a; 3a; 2b; 200a; 300a) via the through hole (11; 21; 31; 110; 210) The air gap measuring method according to claim 1, wherein the distance is measured by subtracting a second length (L2) from the third surface to the first surface from the first length.   The air gap measuring method according to claim 1 or 2, wherein a gauge (4) is inserted into the through hole (11; 21; 31; 110; 210) to measure the distance.   The air gap measuring method according to claim 3, wherein the through hole (11; 21; 31; 110; 210) has a tip shape on the third surface (1b; 2a; 3b; 110b; 210a).   The air gap measuring method according to claim 1 or 2, wherein the distance is measured by measuring a path of light passing through the through hole (11; 21; 31; 110; 210).   The air gap measuring method according to any one of claims 1 to 5, wherein the through hole (11; 21; 31; 110; 210) is parallel to an extending direction of the axis (P).   The air gap measuring method according to any one of claims 1 to 5, wherein the through hole (11; 21; 31; 110; 210) is inclined with respect to the axis (P).   The said through-hole (11; 21; 31; 110; 210) is provided with two or more radial directions centering on the said axis | shaft (P), The said space | interval is measured via the said several through-hole. The air gap measuring method according to any one of 1 to 7. The first magnetic body (1; 3; 200)
A plurality of teeth (12; 32; 220) arranged in a ring around the shaft (P) and having both ends (12a, 12b; 32a, 32b; 220a, 220b) in the extending direction of the shaft;
One end (12a; 32a; 220b) of the tooth has the first surface (1a; 3a; 200b), and the through hole (11; 31; 210) penetrates between the both ends. The air gap measuring method according to any one of 8.   The first magnetic body (2; 100) includes a plurality of permanent magnets (22; 120) arranged along a circumferential direction centering on the axis (P), and the permanent magnets adjacent in the circumferential direction. A member (24; 25; 140) disposed between the member, the member having the first surface (2b; 100a), and the through hole (21; 110) provided in the member. Item 9. The air gap measurement method according to any one of Items 1 to 8.   The first magnetic body (2; 100) further includes a magnetic core (23; 130) in contact with the permanent magnet (22) on the second magnetic body (3; 200) side, and the member (24; 25). 140) and the magnetic body have the first surface (2b; 100a), and the first surface of the member protrudes closer to the second magnetic body than the first surface of the magnetic core. The air gap measuring method according to claim 10.   The first magnetic body (2; 100) further includes a magnetic core (23; 130) in contact with the permanent magnet (22) on the second magnetic body (3; 200) side, and the member (24; 25). 140) and the magnetic core have the planar first surface (2b; 100a), the air gap measuring method according to claim 10. The second magnetic body (2) has a fourth surface (2b) located on the opposite side of the second surface (2a) in the extending direction of the shaft (P), and the axial gap type rotating machine is A third magnetic body (3) having a fifth surface (3a) facing the fourth surface (2b) by forming a predetermined second air gap is further provided, and the third magnetic body penetrates through the third magnetic body. And having a second through hole (31) opening on the fifth surface,
The air gap measurement method according to claim 1, wherein an interval between the second air gaps in the extending direction of the shaft is measured via the second through hole. The second magnetic body (2; 200) has a fourth surface (2b; 200b) located on the opposite side of the second surface (2a; 200a) in the extending direction of the axis (P), and the axial The gap type rotating machine further includes a third magnetic body (3; 300) having a fifth surface (3a; 300a) facing the fourth surface (2b; 200b) by forming a predetermined second air gap. The second magnetic body has a second through hole (21; 210) penetrating between the second surface and the fourth surface;
The air gap measuring method according to any one of claims 1 to 12, wherein an interval between the second air gaps in the extending direction of the shaft is measured via the second through hole.   The first magnetic body (1; 100) and the second magnetic body (2; 200) rotate relatively around the axis (P), extend through the through hole (11; 110), and The distance between the position intersecting the second surface (2a; 200a) and the axis (P) is different from the distance between the position of the second through hole (21; 210) on the second surface and the axis. The air gap measuring method according to claim 14. A first magnetic body (1; 2; 3; 100; 200) having a first surface (1a; 2b; 3a; 100a; 200b) and a second surface (2a; 3a; 2b; 200a; 300a) A second magnetic body (2; 3; 2; 200; 300) that rotates relative to the first magnetic body around a predetermined axis (P), and the first magnetic body passes through the second magnetic body. A method of manufacturing an axial gap type rotating machine having a through hole (11; 21; 31; 110; 210) opened on the first surface,
(A) causing the first surface and the second surface to face each other at a predetermined axis (P);
(B) after the execution of the step (a), measuring a distance between the first surface and the second surface in the extending direction of the shaft via the through hole;
(C) A method of manufacturing an axial gap type rotating machine, wherein the step of fixing the interval is performed after the step (b). The axial gap type rotating machine has a third surface (3a) and a third magnetic body (3) that rotates relative to the second magnetic body (2) around the axis (P). The third magnetic body further includes a second through hole (31) that passes through the third magnetic body and opens on the third surface,
(D) after the execution of the step (c), a step of bringing the fourth surface (2b) of the second magnetic body on the opposite side of the second surface in the extending direction to the third surface. ,
(E) a step of measuring a distance between the third surface and the fourth surface in the extending direction via the second through hole after the step (d) is performed;
(F) The method of manufacturing an axial gap type rotating machine according to claim 16, further comprising a step of fixing a distance between the third surface and the fourth surface after the step (e) is performed. The axial gap type rotating machine has a third surface (1a) and a third magnetic body (1) that rotates relative to the first magnetic body (2) around the axis (P). Further, the third magnetic body has a second through hole (11) penetrating through itself and opening on the third surface,
(D) after the execution of the step (c), a step of bringing the fourth surface (2a) of the first magnetic body on the opposite side of the first surface in the extending direction to the third surface. ,
(E) after the execution of the step (d), a step of measuring a distance between the third surface and the fourth surface in the extending direction via the second through hole;
(F) The method of manufacturing an axial gap type rotating machine according to claim 16, further comprising a step of fixing a distance between the third surface and the fourth surface after the step (e) is performed. A plurality of teeth (12; 32; 220) arranged in a ring around a predetermined axis (P) and having both ends (12a, 12b; 32a, 32b) in the extending direction of the axis;
A field element (2; 300) arranged to form a predetermined air gap with one end of the plurality of teeth in the extending direction;
An axial gap type rotating machine, wherein at least one of the teeth is provided with a through hole (11, 31, 210) penetrating between both ends in the extending direction. A plurality of permanent magnets (22; 120) arranged along a circumferential direction around a predetermined axis (P);
A member (24; disposed between the permanent magnets adjacent in the circumferential direction, having both ends in the extending direction of the shaft, and provided with a through hole (21; 210) penetrating between the both ends 140)
An axial gap type rotating machine comprising: the permanent magnet and teeth (12, 32, 120, 320) arranged in the extending direction so as to form a predetermined air gap.

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