JP2018064401A - Axial gap dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of magnetic flux short circuit, occurring between magnets adjoining in the circumferential direction, while holding the magnets provided in the rotor reliably.SOLUTION: An axial gap dynamo-electric machine includes a stator 2, and a rotor 3 rotating together with a revolving shaft 4, and arranged oppositely to the stator 2 in the axial direction of the revolving shaft 4. The rotor 3 includes multiple permanent magnets 34 arranged, side-by-side, on the stator facing surface 33a in the circumferential direction, so that the polarity is different alternately, and holding members 6, 6A for holding these permanent magnets 34 while covering. Magnetic flux blocking portions (64, 65) for blocking short circuit flux path of these magnets 34, 34 are provided at at least the inter-magnet corresponding part 34P corresponding between adjoining magnets 34, 34 in the holding members 6, 6A.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an axial gap type rotating electrical machine including a stator and a rotor that rotates together with a rotating shaft and is disposed so as to face the stator in the axial direction of the rotating shaft.

  As the rotor provided in the axial gap type rotating electrical machine, a rotor adopting a so-called SPM (Surface Permanent Magnet) structure in which a permanent magnet is fixed to the surface of a disk-shaped core is well known.

  Since the SPM structure has a permanent magnet attached to the surface of the rotor core, it is more susceptible to harmonic components contained in the current than the IPM structure (Interior Permanent Magnet) in which the permanent magnet is embedded in the rotor core. Loss tends to increase. In addition, the magnetic flux density of the magnet fluctuates with the rotation of the rotor.

  As a countermeasure, Patent Document 1 further divides a plurality of magnets (magnet segments) arranged in the circumferential direction of the stator side end face, for example, a fan shape or a truncated pyramid shape, in order to divide the eddy current path. It has been proposed.

  However, when the magnet is further divided from the segment unit as in Patent Document 1, each of the divided magnets receives a centrifugal force due to the rotation of the rotor, and an attractive force and a repulsive force with other magnets. By exerting each other, there may be a case where a sufficient fixed state cannot be maintained only by adhesion to the core, and there is a concern that it may be scattered.

  Note that the rotor disclosed in Patent Document 1 also employs the SPM structure. Since this structure is employed, each of the divided magnets is easily affected by centrifugal force, and the magnets may be scattered. It is thought to be higher.

  Further, in Patent Document 2, in addition to fixing the permanent magnet to the core by bonding, the permanent magnet is sandwiched by clamp members from both sides in the axial direction of the rotating shaft at a position corresponding to the permanent magnet of the rotor. An axial gap type rotating electrical machine that can be fixed to the core side has been proposed.

  However, since the clamp member of Patent Document 2 basically holds only a part of the magnet (magnet segment), when the permanent magnet provided in the rotor of Patent Document 2 is divided, it is not fixed to the core side by the clamp member. There will also be a magnet. In other words, in the axial gap type rotating electric machine of Patent Document 2, the permanent magnet provided in the rotor is securely held, and as a result, it is improved in achieving a structure that can withstand higher rotation and higher torque. There was room.

  By the way, with respect to the plurality of magnets arranged in the circumferential direction so that the polarities are alternately different from each other on the stator facing surface, the rotor is prepared by bringing adjacent magnets as close as possible to each other while maintaining a distance that does not contact each other. It is preferable from the viewpoint that the magnetic flux from each magnet can be efficiently linked to the coil on the stator side.

  However, on the other hand, if magnets with different polarities are too close to each other, the short-circuit magnetic flux will increase between these adjacent magnets, and when using an axial gap type rotating electrical machine as a motor, torque will be reduced as a generator. When applied, the voltage will decrease.

  Therefore, it is desirable that the axial gap type rotating electrical machine has a configuration that satisfies the above two conflicting problems at the same time. However, in Patent Documents 1 and 2 described above, there is no description referring to such a problem. .

JP 2011-78269 A JP2015-192540A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an axial gap type rotating electrical machine capable of suppressing the occurrence of a magnetic flux short circuit occurring between adjacent magnets in the circumferential direction while securely holding a magnet provided in a rotor.

  The present invention relates to an axial gap type rotating electrical machine including a stator and a rotor that rotates together with the rotating shaft and is disposed so as to face the stator in the axial direction of the rotating shaft. A plurality of magnets arranged side by side in the circumferential direction so that their polarities are alternately different from each other on the opposing surface, and a holding member that covers and holds these magnets, and at least between the magnets in the holding member corresponding to adjacent magnets It is characterized in that a magnetic flux interrupting part for interrupting a short-circuit magnetic flux path between these magnets is provided in the corresponding part.

  According to the said structure, generation | occurrence | production of the magnetic flux short circuit which generate | occur | produces between the magnets adjacent in the circumferential direction can be suppressed, hold | maintaining the magnet with which the rotor was equipped reliably.

  As an aspect of the present invention, the magnetic flux blocking portion in the holding member is formed of a non-magnetic material, and at least a portion of the holding member other than the magnetic flux blocking portion and provided in the rotor and the stator It is preferable to form a portion corresponding to between these layers with a magnetic material.

According to the above configuration, since the portion of the holding member other than the magnetic flux blocking portion in the holding member that corresponds to at least the portion between the magnet provided in the rotor and the stator is formed of the magnetic material, the stator and the rotor It can be suppressed that the length of the magnetic gap between the stator and the rotor is increased due to the holding member being disposed in the gap between the stator and the rotor.
Therefore, since the magnetic flux from the rotor side magnet to the stator side does not decrease, a decrease in torque of the axial gap type rotating electrical machine can be suppressed.

  Furthermore, according to the said structure, since the magnetic flux interruption | blocking part in a holding member was formed with the nonmagnetic material, the magnetic short circuit between the magnets adjacent in the circumferential direction can be prevented.

  In the present invention, it is preferable that the portion corresponding to the portion between the magnet provided in the rotor and the stator in the holding member is formed of a magnetic material as described above, but the formation of a non-magnetic material is excluded. It is not a thing. In the present invention, it is preferable to form the magnetic flux blocking part with a non-magnetic material as described above, but this does not exclude the formation of a magnetic material such as a low permeability magnetic material.

  Further, as an aspect of the present invention, a rotor core for fixing a plurality of magnets is provided on the opposite side of the stator to the magnets in the rotor, and the holding member has a shape and a size corresponding to the plurality of magnets. A plurality of cover members formed so as to cover the stator from the stator side, and a pressing member that presses the cover member together with the magnets to the rotor core side at the corresponding portion between the magnets of the adjacent cover member, and the magnetic flux blocking section Is set to at least one of the corresponding part between the magnets of the cover member and the pressing member.

  According to the above configuration, the pressing member presses the magnet toward the rotor core via the cover member in a state where the plurality of cover members cover the corresponding magnets, so that the plurality of magnets provided on the stator facing surface of the rotor It can be held firmly with everything covered.

  Furthermore, by setting at least one of the corresponding portions between the magnets of the adjacent cover member and the pressing member as the magnetic flux blocking part, it is possible to suppress the occurrence of a magnetic flux short circuit that occurs between the adjacent magnets.

  As an aspect of the present invention, the cover member includes a cover main body having a cover end surface formed at a portion facing the magnet so as to cover at least a part of the circumferential end surface of the magnet, and a circumferential direction from the cover end surface. A flange portion protruding toward an adjacent magnet, and the presser member is interposed between adjacent magnets in the circumferential direction via the cover end surface, and the flange portion is pressed against the rotor core side. The cover members adjacent in the circumferential direction are formed to have a width that does not contact each other.

  According to the above configuration, the presser member is interposed between adjacent magnets in the circumferential direction via the cover end surface, so that the adjacent magnets can be kept at an interval at which the magnetic flux is not short-circuited.

  In particular, in the configuration in which the magnetic flux blocking part is set as a presser member, the presser member is interposed between adjacent magnets in the circumferential direction via the cover end surface, so that a magnetic short circuit between adjacent magnets in the circumferential direction is effective. Can be prevented.

  In addition, since the said flange part is plate shape (thin wall), even if it is a case where this flange part is formed with a magnetic material, the suppression effect of generation | occurrence | production of a magnetic flux short circuit can be acquired. However, since the flange portion can enhance the effect of suppressing a magnetic flux short circuit between the magnets, it is preferably formed of a magnetic material having a low magnetic permeability, and more preferably formed of a nonmagnetic material.

  Moreover, as an aspect of this invention, each flange part of an adjacent cover member is formed in the position where a radial direction mutually differs in the circumferential direction edge part of each cover member.

  According to the above configuration, when the plurality of cover members are assembled to the rotor in a state of covering the plurality of magnets, the cover members (flange portions) can be prevented from interfering with each other in the circumferential direction, and each flange portion can be avoided. Can protrude from the adjacent cover member side, so that the pressing member that presses toward the rotor core side can be firmly received.

  As an aspect of the present invention, the holding member includes a cover member integrally formed in the circumferential direction of the rotor so as to collectively cover a plurality of magnets, and the magnetic flux blocking portion is arranged in the circumferential direction of the cover member. Formed by a partition member provided between the adjacent magnets so as to partition adjacent magnets, and a plurality of magnets are fixed on the opposite side of the stator facing surface with respect to the magnets in the rotor. A rotor core that is externally fitted to the rotor core, and an inner peripheral member that is externally fitted to the rotating shaft at a central position of the rotor, and the holding member is an inner member of the outer peripheral member. A pressing piece is formed on the peripheral edge and the outer peripheral edge of the inner peripheral member, and presses the opposing edge on the cover member side facing the radial direction of the inner and outer peripheral edges together with the magnet to the rotor core side. It is those provided in the.

  According to the above configuration, the pressing member provided on the outer peripheral member and the inner peripheral member presses the cover member in a state where a plurality of magnets are collectively covered from both the inner and outer sides in the radial direction with respect to the cover member to the rotor core side. Therefore, all of the plurality of magnets provided on the stator facing surface of the rotor core can be firmly held by the pressing piece and the cover member.

  Furthermore, the magnetic flux short circuit which generate | occur | produces between adjacent magnets can be suppressed by setting the partition member which partitions the adjacent magnet in the circumferential direction to a magnetic flux interruption | blocking part.

-Generation | occurrence | production of the magnetic flux short circuit which generate | occur | produces between the magnets adjacent in the circumferential direction can be suppressed, hold | maintaining the magnet with which the rotor was equipped reliably.

The disassembled perspective view of the rotary electric machine which concerns on 1st Embodiment of this invention. The external view seen from the upper part of a rotor main body. The exploded external view of a rotor main body. FIG. 3 is a cross-sectional view taken along line A-O-B in FIG. 2. The CC sectional view taken on the line of FIG. Explanatory drawing of the modification of the rotary electric machine which concerns on 1st Embodiment. The external view of the rotor main body with which the rotary electric machine which concerns on 2nd Embodiment of this invention was equipped. The exploded external view of a rotor main body. FIG. 3 is a cross-sectional view taken along line D-O-E in FIG. 2. Explanatory drawing of the holding member of 2nd Embodiment. FF sectional view taken on the line of FIG. Explanatory drawing of the modification of the rotary electric machine which concerns on 2nd Embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
(First embodiment)
1 is an exploded perspective view of an axial gap type rotating electrical machine according to the first embodiment of the present invention, FIG. 2 is an external view seen from above the rotor body, FIG. 3 is an exploded external view of the rotor body, and FIG. FIG. 5 is a cross-sectional view taken along the line A-O-B in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line C-C in FIG.

  An axial gap type rotating electrical machine 1 (hereinafter referred to as “rotating electrical machine 1”) shown in FIG. 1 includes a rotor 3 having a rotating shaft 4 as a center and one side of a rotor body 31 described later of the rotor 3 (permanent magnet 34 is provided). A stator 2 which is located on the side where the rotor is provided and is opposed to the rotor body 31 in the axial direction of the rotary shaft 4 with a predetermined interval; Is a so-called 1-rotor 1-stator axial gap type rotating electrical machine. In the following description, the axial direction of the rotary shaft 4 is simply referred to as “axial direction”, the direction orthogonal to the axial direction is “radial direction”, and the rotational direction of the rotary shaft 4 (rotor 3) is “circumferential direction”. Called.

  As shown in FIG. 1, the stator 2 includes a back yoke 21 having a structure in which a magnetic steel sheet is spirally wound around an axis parallel to the axial direction, and the back yoke 21 arranged in a circumferential direction on the back yoke 21. A plurality of stator cores (not shown) that are fixed to each other, coils 22 that are mounted (wound) on each stator core, and end plates 23 that are fixed to the outside of the back yoke 21.

  The stator 2 is inserted from one side of the cylindrical housing 5 to the inside thereof, and is fixed to the housing 5 via an end plate 23.

  An end plate 23 is also provided at the other end of the housing 5, and the end plate 23 closes the opening at the other end.

  The rotor 3 includes a disk-shaped rotor body 31 and a rotating shaft 4 that passes through the center of the rotor body 31. The rotor body 31 is disposed in the housing 5 so as to face the stator 2, and The rotating shaft 4 is rotatably supported by the end plate 23 by being inserted into the bearings 24 held by the end plates 23.

As shown in FIG. 4, the rotating shaft 4 includes therein a coolant introduction passage 41 and a lead-out passage 42 communicating with a coolant circulation space 35 </ b> A described later.
With the position of the rotor core 33 in the axial direction as a boundary, the introduction passage 41 is disposed on the permanent magnet 34 side, and the lead-out passage 42 is disposed on the jacket member 35 side.

  As shown in FIGS. 2 to 5, the rotor main body 31 holds the rotor main member 32 and the permanent magnet 34 provided on the rotor main member 32 so as not to be detached from the rotor core 33 provided on the rotor main member 32. And a member 6.

  As shown in FIG. 4, the rotor main member 32 includes a rotor core 33 formed in a substantially disk shape by winding a strip-shaped electromagnetic steel sheet in a spiral shape, a plurality of permanent magnets 34, and a stator in the rotor core 33. 2 covers the entire stator non-facing surface 33b (the lower surface in FIGS. 1 to 5), which is the surface opposite to the surface 2, and the coolant circulation space 35A (see FIGS. 4 and 5) between the stator non-facing surface 33b. ), An inner cylinder member 36 provided at the center of the rotor core 33 and externally fitted to the rotary shaft 4, an outer cylinder member 37 externally fitted to the rotor core 33, Is included. The inner cylinder member 36 and the outer cylinder member 37 are formed of a nonmagnetic material (austenite stainless steel, aluminum, or the like).

  As shown in FIG. 3, the permanent magnet 34 has a substantially fan shape in plan view, and a stator facing surface 33 a that is a surface facing the stator 2 in the rotor core 33 so as to be aligned in the circumferential direction along the outer circumferential surface of the inner cylindrical member 36. (Upper surface in FIGS. 1 to 5) are arranged via a liquid leakage prevention sheet 38 (see FIGS. 4 and 5), and each is fixed to the upper surface of the liquid leakage prevention sheet 38 by an adhesive. In the example shown in FIG. 2, eight permanent magnets 34 are fixed on the upper surface of the liquid leakage prevention sheet 38. In addition, a plurality of grooves are formed along the circumferential direction and the radial direction of the sector-shaped permanent magnet 34 in plan view (see FIG. 3). The liquid leakage prevention sheet 38 is a sheet for preventing the coolant flowing between the jacket member 35 and the rotor core 33 from leaking to the permanent magnet 34 through the rotor core 33.

  As shown in FIGS. 3 and 5, the permanent magnets 34 are arranged with a predetermined gap so that the permanent magnets 34 adjacent in the circumferential direction do not contact each other in the circumferential direction. Further, as shown in the figure, a stepped portion 34a that is one step lower than the upper surface is formed at the circumferential end of each permanent magnet 34 so as to extend in the radial direction. The step portion 34a is formed of a step surface 34aa and a vertical wall surface 34ab, and is formed in a radial direction so as to form a groove portion (upper groove portion 39a described later) corresponding to a portion between adjacent permanent magnets 34. It extends.

  As shown in FIG. 4, the jacket member 35 includes a substrate portion 35 a positioned on the axially facing surface (the bottom surface in FIG. 4) with the rotor core 33, and a coolant is provided between the substrate portion 35 a and the rotor core 33. A coolant circulation space 35 </ b> A through which the gas flows is formed. The coolant circulation space 35A is formed in a space that expands in correspondence with the permanent magnet arrangement region z (see FIGS. 3 and 4) having a substantially circular shape in plan view.

  The inner cylinder member 36 includes an inlet 36i (see FIG. 4) for taking in the coolant from the introduction passage 41 to the coolant circulation space 35A, and a discharge for discharging the coolant from the coolant circulation space 35A to the outlet passage 42. And an outlet 36o (see FIG. 4).

  As shown in FIG. 4, the outer cylinder member 37 includes a rotor member 33 and the like that are fitted on a cover member 61, a permanent magnet 34, a liquid leakage prevention sheet 38, a rotor core 33, and a jacket member 35, which will be described later. Arranged outside.

  Similarly to the outer cylinder member 37, the inner cylinder member 36 includes a cover member 61, a permanent magnet 34, a liquid leakage prevention sheet 38, a rotor core 33, and a jacket member 35, which will be described later in order from the top. Arranged inside.

  As shown in FIGS. 3 to 5, the rotor main member 32 has a groove portion 39 into which the presser member 65 is fitted from the radially outer side so that the presser member 65 described later sandwiches the rotor main member 32 from the upper and lower sides. In the circumferential direction of the main member 32, it is formed in a portion 34S between the adjacent permanent magnets 34 (hereinafter referred to as “inter-magnet portion 34S”), and in this example, eight rotor main members 32 are formed in the circumferential direction.

  Specifically, as shown in FIG. 4, the groove portion 39 includes an upper groove portion 39 a that extends in the radial direction on the upper surface of the rotor main member 32 (the surface facing the stator 2), and the lower surface of the rotor main member 32 (the stator 2 The outer groove extending in the axial direction on the outer circumferential surface of the outer cylinder member 37 so as to connect the lower groove portion 39b extending in the radial direction to the non-opposing surface) and the respective radial outer ends of the upper groove portion 39a and the lower groove portion 39b. The groove portion 39c is formed continuously.

  As shown in FIG. 3 and FIG. 4, the upper groove portion 39 a is a portion 34 </ b> P (hereinafter, “inter-magnet corresponding portion 34 </ b> P”) corresponding to the upper surface of the outer cylinder member 37 and between the cover members 61, 61 adjacent in the circumferential direction. Is formed in the radial direction to the inner edge of the inner cylindrical member 36. The lower groove portion 39b is formed in a radial direction at a lower position of the upper groove portion 39a on the lower surface of the outer cylinder member 37 and the lower surface of the jacket member 35.

  The holding member 6 has a plurality of (eight in this example) cover members 61 formed so as to cover each permanent magnet 34 from the stator 2 side (above) in a shape and size corresponding to the plurality of permanent magnets 34; A pressing member 65 that presses the cover member 61 together with the permanent magnet 34 toward the rotor core 33 in the inter-magnet corresponding portion 34P is provided.

  In the holding member 6, the cover member 61 is formed of a magnetic material, and the holding member 65 is formed of a non-magnetic material using a magnetic flux blocking portion.

  Specifically, as the magnetic material, for example, iron, electromagnetic steel (iron-based alloy), amorphous, nanocrystallized soft magnetic material, soft magnetic material such as Ni or Ni-based alloy can be employed. These soft magnetic materials are preferable as a holding body because of their relatively large electrical resistance among magnetic bodies.

  Non-magnetic materials include non-magnetic steel such as resin (plastic material), carbon fiber, glass fiber (FRP (Fiber-Reinforced Plastics)), or austenitic steel in order to avoid short-circuiting magnetic flux of the magnet. Magnetic material can be used.

  The pressing member 65 includes a rotor core 33, each permanent magnet 34 fixed to the upper surface thereof, a cover member 61 (a flange portion 63 described later) that covers the permanent magnet 34, and a jacket member 35 fixed to the lower surface of the rotor core 33. Is integrally clamped from both the upper and lower sides to press the cover member 61 together with the permanent magnet 34 toward the rotor core 33 (see FIG. 4).

  As shown in FIGS. 2 to 4, the pressing member 65 is attached to the rotor main member 32 so as to hold the rotor main member 32 from the outside in the radial direction at the intermagnet portion 34 </ b> P in the circumferential direction. In the example shown in FIGS. 2 to 4, eight pressing members 65 are attached to the rotor main member 32.

  As shown in FIGS. 3 and 4, each pressing member 65 includes a pair of arm portions 65a and 65b extending in the radial direction of the rotor main member 32 at positions on both upper and lower sides of the rotor main member 32, and the arm portions 65a, It has a U-shaped shape in a side view having a connecting portion 65 c that connects 65 b at a position radially outside the rotor main member 32.

  Of the pair of arm portions 65a and 65b, the upper arm portion 65a corresponds to a portion that fits into the upper groove portion 39a of the groove portion 39, and the lower arm portion 65b corresponds to a portion that fits into the lower groove portion 39b of the groove portion 39. The connecting portion 65 c corresponds to a portion fitted into the outer peripheral groove portion 39 c of the groove portion 39.

  As shown in FIGS. 4 and 5, the position of the lower arm portion 65b located on the lower side (jacket member 35 side) of the presser member 65 is fitted in the lower groove portion 39b of the jacket member 35, and the jacket The member 35 is pressed down to the rotor core 33 side. Since the thickness of the lower arm portion 65b in the vertical direction is set to be the same as the depth of the lower groove portion 39b, the lower surface of the lower arm portion 65b is flush with the lower surface of the rotor main member 32. .

  As shown in FIGS. 3 to 5, the cover member 61 is integrally formed of a cover main body 62 and a flange portion 63.

  The cover main body 62 includes a cover substrate portion 62a formed in a sector shape corresponding to the permanent magnet 34 so as to cover the sector-shaped permanent magnet 34 from above, and extends downward from a circumferential end of the cover substrate portion 62a. And a cover end face 62b provided.

The cover substrate portion 62a has a thin plate shape. In this example, the cover substrate portion 62a is formed as a laminated body in which thin plate-like magnetic bodies are laminated. Thereby, the electrical resistance in the laminating direction of the thin plate-shaped magnetic body caused by the magnetic flux flowing through the holding member 6 formed of a magnetic body is increased, and energy loss (eddy current loss) due to eddy current is reduced.
The cover end surface 62b is formed so as to cover a part of the circumferential end surface of the permanent magnet 34 in the inter-magnet corresponding portion 34P, that is, the vertical wall surface 34ab of the stepped portion 34a (see FIG. 5).

  The flange portion 63 is adjacent in the circumferential direction from the lower end of the cover end surface 62b so as to cover a part of the circumferential end surface of the permanent magnet 34, that is, the stepped surface 34aa (lower surface) of the stepped portion 34a in the inter-magnet corresponding portion 34P. It protrudes substantially horizontally toward the permanent magnet 34 and is formed along the radial direction (see FIGS. 3 to 5).

  The flange portion 63 is formed at a position different from each other in the radial direction at the circumferential end portion of each cover member 61 between the flange portions 63 of the adjacent cover members 61 (see FIGS. 3 and 4). .

  In this example, each of the flange portions 63, 63 of the adjacent cover members 61, 61 is provided on the circumferential end surface so as to have a concave-convex shape in plan view in the plan view. Projections are formed so as to alternate in the radial direction at the ends. As a result, the flange 63 protrudes in a length that does not contact the cover member 61 and the adjacent permanent magnet 34 including the flange 63 adjacent in the circumferential direction when the permanent magnet 34 is covered with the cover member 61. In addition, the flange portions 63 including the adjacent flange portions 63 are formed to have the same height.

  The flange portion 63 has a width that allows the upper arm portion 65a to be received from the lower side in a state where the lower surface of the upper arm portion 65a of the pressing member 65 is in contact with the upper surface of the flange portion 63, as will be described later. The protrusion is formed.

  In a state where the permanent magnet 34 is covered with the cover substrate portion 62a, the step portion 34a at the circumferential end of the permanent magnet 34 is covered with the cover end surface 62b of the cover member 61 and the flange portion 63 in the intermagnet portion 34S. It becomes a state.

  In this example, the upper arm 65a of the pressing member 65 presses two flange portions 63 provided in the adjacent cover members 61, 61 in the intermagnet portion 34S, that is, a total of four flange portions 63 downward. The upper groove part 39a is fitted.

  Further, the upper arm 65a of the pressing member 65 is interposed in the inter-magnet part 34S via the cover end surface 62b, so that the flange members 63 are pressed toward the rotor core 33 and the cover members 61, 61 adjacent to each other in the circumferential direction. The width which the permanent magnets 34 and 34 do not contact mutually is ensured.

  In the state where the permanent magnet 34 is covered with the cover member 61, the upper surface of the cover member 61 is flush with the upper surfaces of the outer cylinder member 37 and the inner cylinder member 36. Thereby, the upper surface of the rotor main member 32 becomes substantially flush.

  The rotating shaft 4 is inserted inside the inner cylinder member 36 of the rotor body 31 configured as described above. In this state, the rotor body 31 is axially moved by the nut member 51 and the flange 4a (ring member 52). It is being fixed to the rotating shaft 4 in the state pinched | interposed into.

  In a state in which the rotor body 31 is fixed to the rotary shaft 4, as shown in FIG. 4, the ends of the arm portions 65 a and 65 b of the pressing members 65 are pressed toward the rotor core 33 by the nut members 51 and the ring members 52. . Note that a flange portion 65d extending in the opposite direction along the rotation shaft 4 is formed at the tip of each arm portion 65a, 65b of the pressing member 65, and the flange portion of the arm portion 65a on the upper side (permanent magnet 34 side). 65 d is inserted into a recess formed in the center of the nut member 51, and a flange portion 65 d of the lower (jacket member 35) arm portion 65 b is inserted inside the ring member 52. Thereby, the collar parts 65d and 65d of each arm part 65a and 65b are restrained from the radial direction outer side, and the displacement to the radial direction outer side of each pressing member 65 is controlled.

The effect of the rotor 32 of the rotary electric machine 1 of 1st Embodiment mentioned above is demonstrated.
The rotating electrical machine 1 according to the first embodiment includes an axial gap type rotation provided with a stator 2 and a rotor 3 that rotates together with the rotating shaft 4 and is disposed opposite to the stator 2 in the axial direction of the rotating shaft 4. In the electric machine, the rotor 3 includes a plurality of permanent magnets 34 arranged in a circumferential direction so that the polarities are alternately different on the stator facing surface 33a, and a holding member 6 that covers and holds the permanent magnets 34. The holding member 6 is provided with a magnetic flux interrupting portion that interrupts the short-circuit magnetic flux path between the permanent magnets 34 and 34 at least in the inter-magnet corresponding portion 34P corresponding to the inter-magnet portion 34S.

  According to the above configuration, even if the permanent magnet 34 is further finely divided in order to reduce the eddy current loss of the permanent magnet 34 provided in the rotor 3, the holding member 6 covers the plurality of divided permanent magnets 34. Since it can be held, the permanent magnet 34 provided in the rotor 3 can be reliably held without scattering due to centrifugal force accompanying the rotation of the rotor 3 or suction or repulsion with other permanent magnets 34, In the holding member 6, the magnetic flux short-circuit path R (see FIG. 5) is interrupted by providing a magnetic flux blocking portion at least in the inter-magnet corresponding portion 34 </ b> P corresponding to the inter-magnet portion 34 </ b> S, that is, the magnetic flux generated in the inter-magnet portion 34 </ b> S. When it is applied as a motor by suppressing occurrence of a short circuit, it can contribute to an increase in torque, and when applied as a generator, it can contribute to an increase in voltage.

  As an aspect of the present invention, the pressing member 65 as a magnetic flux blocking portion in the holding member 6 is formed of a nonmagnetic material, and at least a portion of the holding member 6 other than the magnetic flux blocking portion (pressing member 65) and at least the rotor 3. A portion corresponding to between the permanent magnet 34 and the stator 2 provided in the above, that is, in this example, the cover member 61 is formed of a magnetic material.

According to the above configuration, the cover substrate 61 is a cover member 61 that is a part other than the magnetic flux blocking part in the holding member 6 and that is at least a part corresponding to between the permanent magnet 34 provided in the rotor 3 and the stator 2. Since 62a is formed of a magnetic material, the length of the magnetic gap between the stator 2 and the rotor 3 is caused by the cover substrate portion 62a being disposed in the gap between the stator 2 and the rotor 3. It won't be long.
Therefore, since it is possible to suppress a decrease in the magnetic flux from the permanent magnet 34 on the rotor 3 side to the stator 2 side, it is possible to prevent a decrease in torque of the axial gap rotating electrical machine 1.

  Further, as an aspect of the present invention, a rotor core 33 for fixing a plurality of permanent magnets 34 is provided on the side opposite to the stator 2 side with respect to the permanent magnets 34 in the rotor 3, and the holding member 6 corresponds to the plurality of permanent magnets 34. A plurality of cover members 61 formed so as to cover each permanent magnet 34 from the stator 2 side in the shape and size, and the cover member 61 on the rotor core 33 side in the corresponding portion 34P between the magnets of the adjacent cover members 61, 61 A presser member 65 that presses the permanent magnet 34 together is provided, and the magnetic flux blocking part is set to the presser member 65.

  According to the above configuration, the presser member 65 presses the permanent magnet 34 toward the rotor core 33 through the cover member 61 in a state where the plurality of cover members 61 cover the corresponding permanent magnets 34, thereby the stator of the rotor 3. It can hold | maintain firmly in the state which covered all the some permanent magnet 34 with which the opposing surface 33a was equipped.

  Furthermore, by setting the magnetic flux blocking portion to the pressing member 65, it is possible to suppress the formation of the magnetic flux short circuit R generated in the inter-magnet part 34S.

  Further, by providing a plurality of cover members 61 corresponding to the plurality of permanent magnets 34 and having a shape and size corresponding to the plurality of permanent magnets 34, for example, the entire surface of the rotor 3 facing the stator 2 is covered. Since the volume of the cover member 61 itself can be reduced as compared with the cover form formed as described above, the influence of eddy current loss generated by the cover member 61 is reduced in the present embodiment in which the cover member 61 is a magnetic body. can do.

  In addition, even if a plurality of cover members 61 are provided corresponding to the plurality of permanent magnets 34, the pressing member 65 includes the adjacent cover members 61, 61 at the inter-magnet corresponding portion 34 </ b> P of the adjacent cover members 61, 61. Since both the adjacent cover members 61 can be pressed into the rotor core 33 side so as to straddle, the cover member 61 can be pressed into the rotor core 33 side efficiently and firmly with a small number of pressing members 65.

  Further, as an aspect of the present invention, the cover member 61 includes a cover main body 62 including a cover end surface 62b formed in the inter-magnet corresponding portion 34P so as to cover at least the stepped portion 34a of the circumferential end surface of the permanent magnet 34, and the cover A flange portion 63 projecting from the end face 62b toward the adjacent permanent magnet 34 in the circumferential direction. The pressing member 65 is interposed in the inter-magnet part 34S via the cover end face 62b and the flange portion 63 is disposed on the rotor core 33. The cover members 61 and 61 adjacent to each other in the circumferential direction in a state of being pressed to the side are formed so as not to contact each other (see FIG. 5).

  According to the above configuration, the cover member 61 is pressed against the rotor core 33 side by the pressing member 65 via the flange portion 63, so that the plurality of permanent magnets 34 provided on the stator facing surface 33 a of the rotor 3 are collectively covered. Can be held firmly.

  Further, the pressing member 65 can be interposed in the inter-magnet part 34S via the cover end surface 62b so that the cover members 61 and 61 do not contact each other as well as the permanent magnets 34 and 34 adjacent in the circumferential direction. Therefore, it is possible to keep the adjacent permanent magnets 34 and 34 at an interval that does not short-circuit the magnetic flux.

  Further, as an aspect of the present invention, the flange portions 63 of the adjacent cover members 61 and 61 are formed to be alternately (alternately) radially in the circumferential end portion of each cover member 61. . That is, the circumferential end portion of the cover member 61 is formed in an uneven shape in plan view (see FIG. 3).

  According to the above configuration, in the state where the permanent magnet 34 is covered with the cover member 61, the cover members 61 (flange portions 63) can be prevented from contacting each other in the circumferential direction, and the flange portions 63 are adjacent to each other. Since it can project longer than the member 61 side, each flange portion 63 can have a sufficient pressing surface pressed against the rotor core 33 side by the pressing member 65.

  However, the present invention is not limited to the configuration in which the flange portions 63 of the adjacent cover members 61 and 61 are alternately formed in the radial direction as in the first embodiment described above, as shown in FIG. A configuration may be adopted in which the flange portions 63, 63 protrude from the same position in the radial direction at the end portions in the circumferential direction of the cover members 61, 61 so as to face each other in the circumferential direction. In this configuration, each of the flange portions 63, 63 is formed with a protruding length slightly shorter than the intermediate position of the interval between the magnet portions 34S.

  Alternatively, as shown in FIG. 6B as still another embodiment, in the permanent magnet 34 in which the stepped portion 34 a is not formed on the peripheral end surface, the cover member 61 has the cover end surface 62 b of the permanent magnet 34. A length that covers the entire vertical wall surface 34ab (peripheral end surface) corresponding to the thickness is formed, and the flange portion 63 projects from the lower end of the cover end surface 62b in the circumferential direction along the upper surface of the rotor core 33. .

  6A and 6B are explanatory diagrams for explaining a modification of the rotating electrical machine 1 according to the first embodiment, and are cross-sectional views corresponding to FIG.

  In the first embodiment, the pressing member 65 is formed of a nonmagnetic material as a magnetic flux blocking portion. However, the present invention is not limited to the pressing member 65 being formed of a nonmagnetic material as a magnetic flux blocking portion. A configuration in which at least the inter-magnet corresponding portion 34P in the cover member 61, for example, the flange portion 63 or the cover end surface 62b is formed of a nonmagnetic material as a magnetic flux blocking portion may be employed.

(Second Embodiment)
FIGS. 7-11 is explanatory drawing of the rotor 3A with which the axial gap type rotary electric machine 1A (henceforth "rotary electric machine 1A") based on 2nd Embodiment of this invention was equipped, FIG. FIG. 8 is an exploded external view of the rotor body, FIG. 9 is a cross-sectional view taken along the line D-O-E of FIG. 7, and FIG. FIG. 10B is a perspective view of the holding member 6 according to the second embodiment as viewed from below, and FIG. 11 is a cross-sectional view taken along line FF in FIG. It is. In addition, about the structure similar to 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 7 to 9, the holding member 6 </ b> A provided in the rotor 3 </ b> A according to the second embodiment is integrally formed in the circumferential direction of the rotor 3 </ b> A so as to cover a plurality of fan-shaped permanent magnets 34 </ b> A in plan view. The cover member 61A having a substantially disk shape in plan view and the pressing pieces 361 and 371 formed on the respective sides of the inner cylinder member 36A and the outer cylinder member 37A instead of the pressing member 65 described above are configured. Yes.

  Specifically, as shown in FIGS. 8 to 10A and 10B, the cover member 61A includes a cover main body 62A and a partition plate 64, and is integrally formed. The cover main body 62A is continuous in the circumferential direction without any gap even in the inter-magnet corresponding portion 34P, and is formed in a shape corresponding to the permanent magnet arrangement region z, that is, a substantially annular shape with an open center.

  On the outer peripheral edge and inner peripheral edge of the cover main body 62A, step portions 62Aa and 62Ab are formed over the entire circumference so as to be engageable by pressing pieces 361 and 371, which will be described later. .

  The cover body 62A is entirely formed of a magnetic material, and in this example, the cover body 62A is formed as a laminated body in which thin plate-shaped magnetic materials are laminated. Thereby, the electrical resistance in the laminating direction of the thin plate-shaped magnetic body caused by the magnetic flux flowing through the holding body formed of the magnetic body is increased to reduce the energy loss (eddy current loss) due to the eddy current.

  Further, on the lower surface (back surface) of the cover main body 62A, a pair of convex portions 62Ac and 62Ac projecting downward are integrally formed on the inter-magnet corresponding portion 34P, and the pair of convex portions 62Ac and 62Ac are The groove portions 620 (see FIG. 10 (a) and FIG. 11) having a space in which the partition plate 64 can be fitted between the convex portions 62Ac and 62Ac are provided apart from each other in the circumferential direction. They extend in parallel from the radially inner end to the outer end.

  The partition plate 64 has a long side (radial side) corresponding to the radius of the cover main body 62A and a short side (axial side) slightly shorter than the thickness of the permanent magnet 34A. It is formed in a strip-like (rectangular) plate shape having a thickness corresponding to a gap between adjacent permanent magnets 34A in the circumferential direction.

  At one end (radial outer end) in the longitudinal direction of the upper end side of the partition plate 64, that is, at a portion corresponding to the pressing piece 371 of the outer cylinder member 37A, a notch 64a is formed by notching the portion (FIG. 9). Similarly, at one end in the longitudinal direction (radial inner end) of the upper end side of the partition plate 64, that is, at a portion corresponding to the pressing piece 361 of the inner cylinder member 36A, a notch 64b in which the portion is cut is formed. (See the figure).

The partition plate 64 is formed of a non-magnetic material as a magnetic flux blocking part.
The partition plate 64 is integrated with the cover main body 62A by fitting the entire long side portion on the upper end side into the groove portion 620 (see FIGS. 10A and 10B).

  As a result, the cover member 61A is formed such that eight partition plates 64 project downward from the eight inter-magnet corresponding portions 34P in the circumferential direction of the cover body 62A, and these eight partition plates 64 are formed radially in bottom view. Yes. And in the state which covered the permanent magnet 34A with the cover member 61A, it will be in the state which the partition plate 64 interposed in the site | part 34S between magnets in the circumferential direction.

  As shown in FIGS. 7 to 9, the outer cylinder member 37 </ b> A according to the second embodiment is provided with the hook-shaped presser piece 371 that protrudes inward over the entire circumference on the inner circumferential edge at the upper end thereof. ing. Similarly, the inner cylinder member 36A is provided with the hook-shaped presser piece 361 that protrudes outward over the entire circumference on the outer peripheral edge of the upper end thereof (see the figure).

  The holding pieces 361 and 371 of the inner cylinder member 36A and the outer cylinder member 37A both hold the permanent magnet 34A toward the rotor core 33 via the cover member 61A. The holding pieces 361 and 371 and the cover member 61A And constitutes a holding member 6A of the second embodiment.

  Further, as shown in FIGS. 8 and 9, a projecting piece 362 projecting downward is provided at the lower portion of the outer cylinder member 37A, and at the upper portion of the outer peripheral portion provided in the jacket member 35A. Is provided with a projecting piece 350 projecting downward from the outer side of a projecting piece 362 provided on the upper portion of the jacket member 35A, and these projecting pieces 350 and 362 are arranged in the radial direction. Is engaged.

The permanent magnet 34A according to the second embodiment is formed with a step portion 34Aa extending in the circumferential direction on the outer peripheral edge corresponding to the pressing piece 371 of the outer cylinder member 37A, and corresponds to the pressing piece 361 of the inner cylinder member 36A. A stepped portion 34Ab extending in the circumferential direction is formed on the inner peripheral edge (see FIG. 9).
In the present embodiment, the stepped portion 34a (see FIG. 5) as in the first embodiment is not formed at the circumferential end of the permanent magnet 34A (see FIG. 8).

  The holding pieces 361 and 371 of the inner cylinder member 36A and the outer cylinder member 37A are both stepped portions 34Ab and 34Aa of the permanent magnet 34A from the opposite side (upper side) of the rotor core 33 via the stepped portions 62Ab and 62Aa of the cover member 61A. Engage with. The holding pieces 361 and 371 are configured to hold the permanent magnet 34 </ b> A toward the rotor core 33 via the cover member 61 </ b> A from both inside and outside in the radial direction.

  At this time, the upper surface of the outer cylinder member 37A, the upper surface of the cover member 61A, and the upper surface of the inner cylinder member 36A are flush with each other (see FIG. 7).

  As shown in FIG. 9, the outer cylinder member 37 </ b> A moves the step part 62 </ b> Aa of the cover member 61 </ b> A, the step part 34 </ b> Aa of the permanent magnet 34 </ b> A, the liquid leakage prevention sheet 38 and the rotor core 33 together with the outer periphery of the jacket member 35 </ b> A. The inner cylinder member 36A is inserted into these so as to be sandwiched from both sides, and the inner cylindrical member 36A sandwiches the stepped portion 62Ab of the cover member 61A, the stepped portion 34Ab of the permanent magnet 34A, the liquid leakage prevention sheet 38 and the rotor core 33 from both the upper and lower sides. It is fitted in these.

  As described above, the rotating electrical machine 1A according to the second embodiment includes the cover member 61A integrally formed in the circumferential direction of the rotor 3A so as to collectively cover the plurality of permanent magnets 34A on the holding member 6A. The part is formed by a partition plate 64 provided between the adjacent magnets 34A and 34A so as to partition the adjacent permanent magnets 34A so as to partition the adjacent permanent magnets 34A. A rotor core 33 that fixes a plurality of permanent magnets 34A is provided on the side opposite to the stator facing surface 33a with respect to the magnet 34A, and an outer cylinder member 37A that is externally fitted to the rotor core 33 is provided. 6A, the holding member 6A is formed on the inner peripheral edge of the outer cylindrical member 37A and the outer peripheral edge of the inner cylindrical member 36A. In which further comprises a pressing piece 371,361 to press the opposite edges of the cover member 61A side facing the periphery of the respective radially on the side of the permanent magnet 34A each rotor core 33 (see FIGS. 7 to 11).

  According to the above configuration, the cover member 61A in a state in which the plurality of permanent magnets 34A are collectively covered by the cover member 61A of the outer cylinder member 37A and the inner cylinder member 36A and the presser pieces 371 and 361 provided at the opposing edge portions. Can be pressed to the rotor core 33 side from both the inner and outer sides in the radial direction, and all of the plurality of permanent magnets 34A provided on the stator facing surface 33a of the rotor 3A are firmly held by the pressing pieces 371, 361 and the cover member 61A. Can be held.

  Furthermore, by setting the partition plate 64 that partitions the adjacent permanent magnets 34A in the circumferential direction as the magnetic flux blocking portion, it is possible to suppress the occurrence of a magnetic flux short circuit that occurs between the adjacent magnets 34A and 34A.

In the correspondence between the configuration of the present invention and the above-described embodiment, the magnet of the present invention corresponds to the permanent magnets 34 and 34A of the embodiment.
Similarly,
The inner circumferential member corresponds to the inner cylinder member 36,
The outer peripheral member corresponds to the outer cylinder member 37,
The partition member corresponds to the partition plate 64,
Although the magnetic flux shielding part corresponds to the pressing member 65 of the first embodiment or the partition plate 64 of the second embodiment, the present invention is not limited to the configuration of the above-described embodiment, and many implementations are possible. A form can be obtained.

For example, as shown in FIGS. 12A and 12B, a configuration in which the cover member 61 </ b> B is formed of a nonmagnetic material similarly to the partition plate 64 may be employed. In this case, a fan-shaped magnetic panel 70 may be provided in each part corresponding to the permanent magnet 34A in the circumferential direction of the cover main body 62B in plan view.
12 (a) and 12 (b) are explanatory diagrams for explaining a modification of the rotating electrical machine 1A according to the second embodiment, and FIG. 12 (a) corresponds to FIG. 10 (a). FIG. 12B is a cross-sectional view corresponding to FIG. 10B.

  In this embodiment, eight magnetic body panels 70 are provided corresponding to the number of permanent magnets 34A, and the shape of the permanent magnet 34A is the same as that of the permanent magnet 34A, and is formed in a fan shape in plan view. Further, in each portion corresponding to the permanent magnet 34A in the circumferential direction of the cover main body 62B, a fitting hole 68 (see FIG. 12A) into which the magnetic body panel 70 is fitted is formed penetrating in the thickness direction. The magnetic panel 70 is provided in the cover member 61 </ b> B so as to face the corresponding permanent magnet 34 </ b> A by fitting the magnetic panel 70 in the fitting hole 68.

In this configuration, the cover main body 62B of the cover member 61B is formed of a non-magnetic material such as resin. Therefore, when the permanent magnet 34A is covered with the cover member 61B while improving the weight and formability, the rotor 3A Since the magnetic body panel 70 in the cover member 61B is interposed at a portion corresponding to the permanent magnet 34A and the stator 2 included in the cover member 61B, the cover member 61B is disposed in the gap between the stator 2 and the rotor 3A. As a result, it is possible to suppress the length of the magnetic gap between the stator 2 and the rotor 3A from becoming long.
Therefore, since the magnetic flux from the permanent magnet 34A on the rotor 3A side to the stator 2 side does not decrease, it is possible to prevent a reduction in torque of the axial gap type rotating electrical machine.

  Furthermore, by forming the magnetic body panel 70 as a laminated body in which thin plate-like magnetic bodies are laminated, the electrical resistance in the laminating direction of the thin plate-like magnetic body caused by the magnetic flux flowing through the magnetic body panel 70 formed of the magnetic body. The energy loss due to eddy current (eddy current loss) can also be reduced.

  In the cover member 61B of the present embodiment, the cover main body 62B is formed of a non-magnetic material together with the partition plate 64. Therefore, the members 64 and 62B are not combined and formed as separate members. May be formed integrally.

DESCRIPTION OF SYMBOLS 1,1A ... Axial gap type rotary electric machine 2 ... Stator 4 ... Rotary shaft 3, 3A ... Rotor 6, 6A ... Holding members 34, 34A ... Permanent magnet (magnet)
34P ... Magnet corresponding part 33 ... Rotor core 33a ... Stator facing surface 37 ... Outer cylinder member (outer peripheral member)
36 ... Inner cylinder member (inner peripheral member)
61, 61A ... Cover member 62b ... Cover end face 62 ... Cover body 63 ... Flange (magnetic flux shield)
64 ... Partition plate (partition member, magnetic flux block)
65: Presser member (magnetic flux interrupter)
361, 371 ... Presser piece

Claims (6)

An axial gap type rotating electrical machine comprising a stator and a rotor that rotates together with a rotating shaft and is disposed opposite to the stator in the axial direction of the rotating shaft,
The rotor includes a plurality of magnets arranged side by side in the circumferential direction so that the polarities are alternately different on the stator facing surface, and a holding member that covers and holds these magnets,
An axial gap type rotating electrical machine in which a magnetic flux interrupting part that interrupts a short-circuit magnetic flux path between these magnets is provided at least at a corresponding part between the magnets in the holding member. The magnetic flux blocking part of the holding member is formed of a non-magnetic material, and the part of the holding member other than the magnetic flux blocking part is at least a part corresponding to between the magnet provided in the rotor and the stator. The axial gap type rotating electrical machine according to claim 1, wherein is formed of a magnetic material. A rotor core that fixes a plurality of magnets on the side opposite to the stator side with respect to the magnets in the rotor,
The holding member includes a plurality of cover members formed so as to cover each magnet from the stator side in a shape and size corresponding to the plurality of magnets, and the cover member at the inter-magnet corresponding portion of the adjacent cover member. A presser member that holds the magnet together with the rotor core,
The axial gap type rotating electrical machine according to claim 1 or 2, wherein the magnetic flux blocking section is set to at least one of the corresponding portion between the magnets of the cover member and a pressing member. The cover member is
A cover body provided with a cover end surface formed at a portion facing the magnet so as to cover at least a part of the circumferential end surface of the magnet, and a flange portion formed to protrude from the cover end surface toward the adjacent magnet in the circumferential direction And
The presser member is interposed between adjacent magnets in the circumferential direction via the cover end face, and has a width that prevents the cover members adjacent in the circumferential direction from contacting each other in a state where the flange portion is pressed to the rotor core side. The axial gap type rotating electrical machine according to claim 3, which is formed as described above. 5. The axial gap type rotating electrical machine according to claim 4, wherein the flange portions of the adjacent cover members are formed at different positions in the radial direction at the circumferential ends of the respective cover members. The holding member includes a cover member integrally formed in the circumferential direction of the rotor so as to cover a plurality of magnets together.
The magnetic flux blocking part is provided in a part corresponding to the area between the magnets in the circumferential direction of the cover member, and is formed by a partition member interposed between adjacent magnets so as to partition adjacent magnets,
A rotor core that fixes a plurality of magnets on the opposite side of the stator facing surface with respect to the magnets in the rotor,
The rotor includes an outer peripheral member that fits externally to the rotor core, and an inner peripheral member that fits externally to the rotating shaft at the center position of the rotor,
The holding member is formed on the inner peripheral edge of the outer peripheral member and the outer peripheral edge of the inner peripheral member, and the opposing edge on the cover member side facing the inner and outer peripheral edges in the radial direction together with the magnet is on the rotor core side. The axial gap type rotating electrical machine according to claim 1, further comprising a pressing piece that is pressed onto the axial gap type rotating electric machine.

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