JP5747672B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine used as an electric motor or a generator.

  In various fields such as automobiles and home appliances, rotating electric machines that use electric motors that convert electric power into driving force or generators that convert driving force into electric power are used. As this rotating electrical machine, there is one provided with a winding unit having a plurality of winding portions arranged in an annular shape and a magnet body unit having a plurality of magnet bodies arranged so as to face the winding portions. Many are used.

The rotating electrical machine includes a winding unit and a magnet body unit, one of which is a rotor (rotation) and the other is a stator (fixed side), and the winding unit and the magnet body unit rotate relatively. It is configured to be possible.
In such a rotating electrical machine, since a gap is formed between the winding part and the magnet body, foreign matters such as sand and pebbles enter the gap, and the winding part or the magnet body may be damaged or smooth. May interfere with rotation. Thus, by adopting a structure in which a cover that covers the entire surface of the winding portion and the magnet body as disclosed in Patent Document 1 is employed, entry of foreign matter can be prevented.

Japanese Patent No. 4572591

  However, when it is going to employ | adopt the structure of patent document 1, the increase in the number of parts which comprises a rotary electric machine and the increase in the assembly | attachment man-hour of a cover are needed. Therefore, the cost of the rotating electrical machine may increase and the production efficiency may decrease.

  The present invention has been made in view of such a background, and intends to provide a rotating electrical machine capable of preventing foreign matter from entering between a winding portion and a magnet body with an inexpensive and simple structure. Is.

A first aspect of the present invention is a winding unit formed by arranging a plurality of winding portions in an annular shape;
A magnet body unit that rotates relative to the winding unit and has a magnet body disposed opposite to the winding portion;
The winding portion includes a core made of a magnetic material, a coil wound around the core, and a bobbin interposed between the core and the coil.
The magnet body and the core of the winding part are arranged to face each other,
The bobbin includes a protrusion that protrudes from a front side and a rear side of the core in a rotation direction of the magnet body unit toward a gap between the core and the magnet body. There is .

In the rotating electrical machine, it is preferable that the bobbin includes a covering portion that covers at least a part of an opening end of a gap between the core and the magnet body.

The bobbin of the upper Symbol rotary electric machine is provided with the covering portion covering at least a part of the open end of the gap in between the core and the magnet body. By providing this covering portion, the opening area of the opening end can be reduced. For this reason, it is possible to make it difficult for foreign matter to enter the gap between the core and the magnet body from the opening end. Therefore, damage to the rotating electrical machine can be prevented. Moreover, the said coating | coated part is comprised by a part of said bobbin. Therefore, it is possible to prevent an increase in the number of parts constituting the rotating electric machine and an increase in the number of parts assembling steps. Therefore, it is possible to suppress a decrease in production efficiency of the rotating electrical machine and prevent an increase in cost. Therefore, the rotary electric machine having a simple structure and inexpensive can be obtained.

In the first aspect, the bobbin of the rotating electrical machine includes the protruding portion protruding from the front side and the rear side of the core in the rotation direction toward the gap between the core and the magnet body. ing. Therefore, when the winding unit is rotated, foreign matter that has entered between the winding portion and the magnet body from the opening can be swept away by the protruding portion. Therefore, even if foreign matter enters the gap between the core and the magnet body from the opening, the foreign matter is quickly swept away by the protrusion. Therefore, damage to the winding portion and the magnet body can be prevented. Moreover, the said protrusion part is comprised by a part of said bobbin. Therefore, it is possible to prevent an increase in the number of parts constituting the rotating electric machine and an increase in the number of parts assembling steps. Accordingly, it is possible to prevent an increase in cost of the rotating electrical machine and a decrease in production efficiency. Therefore, the rotary electric machine having a simple structure and inexpensive can be obtained.

  According to the present invention, as described above, it is possible to provide a rotating electrical machine capable of preventing foreign matter from entering between the winding portion and the magnet body with an inexpensive and simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. The principal part enlarged view of FIG. FIG. 3 is an explanatory diagram showing a bobbin in the first embodiment. Explanatory drawing of the B arrow direction in FIG. The CC sectional view taken on the line of FIG. Explanatory drawing which shows the modification of a protrusion part. Explanatory drawing which shows the rotary electric machine in Example 2. FIG. The DD sectional view taken on the line in FIG. FIG. 10 is a cross-sectional view taken along line EE in FIG. 9. Explanatory drawing which shows the rotary electric machine in Example 3. FIG. FIG. 12 is a cross-sectional view taken along line FF in FIG. 11.

In the rotating electrical machine, the covering portion, it is not preferable covering more than 1/3 of the opening area of the opening end. In this case, the effect of preventing entry of foreign matter into the gap between the core and the magnet body can be further improved.

Also, the bobbin may have preferably be made of resin. In this case, the covering portion, the protruding portion, and the bobbin can be easily formed integrally. That is, since resin molding has a high degree of freedom in product shape, even a complicated shape can be formed relatively easily. In general, the resin is softer than a metal or a magnet body. Therefore, even if the covering portion or the protruding portion comes into contact with the magnet body unit due to variations in tolerance or the like, the input applied to the magnet body can be reduced. Therefore, damage and dropout of the magnet body can be prevented.

Example 1
A rotating electrical machine 1 according to an embodiment of the present invention will be described with reference to FIGS.
The rotating electrical machine 1 includes a winding unit 2 formed by arranging a plurality of winding portions 20 in a ring shape, and a magnet body unit 6 having a magnet body 61 arranged to face the winding portion 20. The winding portion 20 includes a core 30 made of a magnetic material, a coil 4 wound around the core 30, and a bobbin 5 interposed between the core 30 and the coil 4. The magnet body 61 and the core 30 of the winding part 20 are disposed to face each other. The bobbin 5 includes a covering portion 543 that covers a part of the opening end 10 of the gap 101 between the core 30 and the magnet body 61.

The rotating electrical machine 1 of this example will be described in further detail.
In this example, the direction in which the rotor (rotation side) of the rotating electrical machine 1 rotates is defined as a rotation direction R.
The rotating electrical machine 1 shown in this example is mounted on a motorcycle and used as a generator.
As shown in FIGS. 1 and 2, the rotating electrical machine 1 includes a magnet body unit 6 that is a rotor (rotating side) that rotates using an engine (not shown) as a drive source, and a stator (fixed side) that is fixed to the vehicle body of the motorcycle. ) Winding unit 2.

As shown in FIGS. 1 and 2, the magnet body unit 6 includes a case 62 connected to the engine, a plurality of magnet bodies 61 arranged inside the case 62, and a winding unit 2. And a rotating shaft 622 to be supported.
As shown in FIG. 2, the case 62 includes a substantially disk-shaped bottom portion 621 and a cylindrical portion 623 that stands vertically from the outer periphery of the bottom portion 621. As shown in FIG. 1, a plurality of magnet bodies 61 are arranged on the inner peripheral surface of the cylindrical portion 623. The plurality of magnet bodies 61 are arranged so that their magnetic poles face the inner peripheral side, and N poles and S poles are alternately arranged in the circumferential direction. In addition, when the magnet body unit 6 and the winding unit 2 are combined into the rotating electrical machine 1, the magnet body 61 is opposed to the winding section 20 on the outer peripheral side of the annular winding section 20. Arranged.

Further, as shown in FIG. 2, a rotation shaft 622 is provided on a surface of the bottom 621 that is disposed inside the case 62. The rotation shaft 622 is erected perpendicularly to the bottom 621 and has the same center as the center of the case 62. Rotary shaft 622 is, as shown in the figure, when the coalesced and a magnet body unit 6 and the winding unit 2 is rotatably supported by a bearing 31 2 arranged on the base portion 31 of the winding unit 2 . Thereby, the magnet body unit 6 holding the plurality of magnet bodies 61 can rotate with respect to the winding unit 2.

  As shown in FIG. 1, the winding unit 2 includes a plurality of winding portions 20 arranged in an annular shape. The winding portion 20 includes a core 30 made of a magnetic material, a coil 4 wound around the core 30, and a bobbin 5 disposed between the core 30 and the coil 4.

Core 30, an electromagnetic steel sheet which is cut out by a press machine, a laminated core formed by laminating a plurality in the direction of the axis of rotation 622 of the magnet unit 6. As shown in FIGS. 1 and 2, a plurality of cores 30 are formed so as to project radially from the outer peripheral side surface of the base 31 that is substantially cylindrical in the stacked state toward the radially outer side. As shown in FIGS. 4 and 6, a refracting portion 301 extending toward the front side and the rear side in the rotation direction R of the magnet body unit 6 is formed at the tip of the core 30. Further, as shown in FIG. 2, a bearing 312 is inserted and held in the inner periphery of the base 31, and a rotating shaft 622 disposed in the magnet body unit 6 can be supported by the bearing 312. The surfaces of the core 30 and the base 31 are painted with an insulating paint.

  As shown in FIGS. 1 and 2, the coil 4 is wound around the side surface arranged perpendicular to the protruding direction of the core 30. The coil 4 is connected to a power transmission harness (not shown), and rotates the magnet body unit 6 to transmit power generated in the coil 4 to the electric circuit of the motorcycle via the power transmission harness. It is configured.

  As shown in FIGS. 2 to 6, a bobbin 5 made of an insulating resin is disposed between the core 30 and the coil 4. As shown in FIGS. 4 and 5, the bobbin 5 includes a first bobbin 51 and a second bobbin 52, and is disposed so as to be sandwiched with respect to one core 30 from both sides in the stacking direction of the core 30. At this time, the second bobbin 52 is arranged so as to be positioned on the bottom 621 side of the case 62 with respect to the magnet body unit 6.

  As shown in FIGS. 5 and 6, the first bobbin 51 includes a side insulating portion 53 that has a substantially U-shaped cross section in a plane perpendicular to the protruding direction of the core 30 and covers the side surface of the core 30. Yes. The side insulating portion 53 extends from the end portion disposed on the front end side of the core 30 to the front side and the rear side in the rotational direction R of the rotating electrical machine 1 and covers the inner side surface of the refractive portion 301 of the core 30. An insulating part 54 is provided. Further, in the refractive insulating portion 54, the tip portion disposed on the front side and the rear side with respect to the rotation direction R of the magnet body unit 6 is provided with a protruding portion 544 that is formed to protrude toward the outer peripheral side of the rotating electrical machine 1. Yes. In this example, the protruding portion 544 has a length that is at least half of the radial width of the gap 101 between the core 30 and the magnet body 61. As shown in FIGS. 4 and 5, the projecting portion 544 has a substantially flat plate shape, and is uniformly formed on the entire distal end portion of the refractive insulating portion 54.

  As shown in FIGS. 4 to 6, the second bobbin 52 includes a side surface insulating portion 53, a refractive insulating portion 54, and a protruding portion 544, similar to the first bobbin 51. As shown in FIGS. 1 to 5, the second bobbin 52 includes a covering portion 543 that is formed to protrude from the refractive insulating portion 54 toward the radially outer side of the core 30. In this example, the covering portion 543 is formed so as to cover the entire open end 10 of the gap 101 between the core 30 and the magnet body 61. In the circumferential direction of the rotating electrical machine 1, the width of the covering portion 543 is set wider than the width at the opening end 10. Further, the width of the covering portion 543 and the width between the adjacent covering portions 543 are set to a ratio of about 8: 2.

Next, the function and effect of this example will be described.
The bobbin 5 of the rotating electrical machine 1 includes a covering portion 543 that covers a part of the opening end 10 of the gap 101 between the core 30 and the magnet body 61. By providing the covering portion 543, the opening area of the opening end 10 can be reduced. Thereby, it can be made difficult for foreign matter to enter the opening end 10. Therefore, damage to the rotating electrical machine 1 can be prevented. The covering portion 543 is configured by a part of the bobbin 5. Therefore, it is possible to prevent an increase in the number of parts constituting the rotating electrical machine 1 and an increase in the number of parts assembly steps. Therefore, an increase in cost of the rotating electrical machine 1 and a decrease in production efficiency can be prevented.

  Further, the bobbin 5 includes a protruding portion 544 that protrudes toward the gap 101 between the core 30 and the magnet body 61. Therefore, when the winding unit 2 is rotated, foreign matter that has entered between the winding portion 20 and the magnet body 61 from the opening end 10 can be swept out by the protruding portion 544. Thereby, even if a foreign substance enters the opening end 10, it can be quickly discharged. Therefore, damage to the winding part 20 and the magnet body 61 can be prevented. Further, the protruding portion 544 is constituted by a part of the bobbin 5. Therefore, it is possible to prevent an increase in the number of parts constituting the rotary electric machine 1 and an increase in the number of parts assembling steps. Thereby, the increase in the cost of the rotary electric machine 1 and the fall of production efficiency can be prevented.

  In the rotating electrical machine 1, the covering portion 543 covers 1/3 or more of the opening area at the opening end 10. Therefore, it is possible to increase the range of covering the opening end 10 by the covering portion 543 and to reduce the opening area of the opening end 10. Therefore, the effect of preventing the entry of foreign matter by the covering portion 543 can be further improved.

The bobbin 5 is made of resin. Therefore, it is easy to integrally form the covering portion 543 or the protruding portion 544 on the bobbin 5. That is, in resin molding, since the degree of freedom of the product shape is high, even a complicated shape can be formed relatively easily. Further, the resin is often softer than the metal or the magnet body 61. Therefore, even if the covering portion 543 or the protruding portion 544 comes into contact with the magnet body unit 6 due to variations in tolerance, the magnet body unit 6 is hardly damaged.
Moreover, although the protrusion part 544 of this example was flat form, various shapes, such as the comb-tooth shape shown in FIG. 7, can be used. Also in this case, the same effect as this example can be obtained.

  As described above, it is possible to provide the rotating electrical machine 1 that can prevent foreign matter from entering between the winding portion 20 and the magnet body 61 with an inexpensive and simple structure.

(Example 2)
This example is an example in which the structure of the rotating electrical machine 1 is changed with respect to the first embodiment.
As shown in FIGS. 8 to 10, the rotating electrical machine 1 of the present example uses the magnet body unit 6 as the rotor (rotation side), the winding unit 2 as the stator (fixed side), and the magnet body unit 6 as the winding unit 2. It is arranged on the inner peripheral side.
As shown in FIG. 9, the magnet body unit 6 includes a substantially cylindrical magnet body holding body 63 and a plurality of magnet bodies 61 arranged on the outer peripheral side surface of the magnet body holding body 63 arranged in a direction perpendicular to the axial direction. It is. The plurality of magnet bodies 61 are arranged so that the respective magnetic poles face the outer peripheral side, and the N poles and the S poles are alternately arranged in the circumferential direction. The magnet body holder 63 is configured to be rotatable by the driving force of the engine. Further, when the magnet body unit 6 and the winding unit 2 are combined, the winding portion 20 and the magnet body 61 are arranged to face each other.

As shown in FIGS. 8 to 10, the core 30 in the winding unit 2 is formed so as to protrude from the inner peripheral surface of the annular base 31 toward the radially inner side of the base 31 at equal intervals. A refracting portion 301 extending forward and backward in the rotation direction R of the magnet body unit 6 is formed at the tip of the core 30.
As shown in FIGS. 8 and 9, the covering portion 543 of the bobbin 5 is provided on the inner peripheral side of the winding unit 2 so as to cover a part of the opening end 10 of the gap 101 between the core 30 and the magnet body 61. Protrusions are formed. As shown in FIG. 10, in the refractive insulating portion 54, the substantially flat plate-like protrusion that protrudes toward the magnet body 61 at the front end portion disposed on the front side and the rear side in the rotation direction R of the magnet body unit 6. A portion 544 is formed.
Other configurations are the same as those of the first embodiment.
Also in this example, it is possible to obtain the same effect as that of the first embodiment.

(Example 3)
This example is an example in which the covering portion 543 and the protruding portion 544 are provided on the bobbin 5 in the axial gap type rotating electrical machine 1.
As shown in FIGS. 11 and 12, the rotating electrical machine 1 of this example includes a magnet body 61 of a magnet body unit 6 that forms a rotor (rotation side) and a winding portion 20 of a winding unit 2 that forms a stator (fixed side). The axial gap type rotating electrical machine 1 is shown in which are arranged in the direction of the rotating shaft 622 of the rotating electrical machine 1.
As shown in FIG. 12, the magnet body unit 6 includes a rotating shaft 622 and magnet bodies 61 disposed at both ends of the rotating shaft 622.
The magnet body 61 is formed in an annular plate shape, and is subjected to a magnetizing process such that a plurality of N poles and S poles are alternately formed in the circumferential direction with the magnetic poles facing the main surface. The magnet body 61 is bonded and fixed to a disk-shaped magnet body holding body 63, and is disposed perpendicular to the axial direction of the rotating shaft 622 via the magnet body holding body 63. Further, the magnet bodies 61 disposed at both ends of the rotating shaft 622 are disposed so that different magnetic poles face each other.

As shown in FIG. 12, the winding unit 2 is arranged between two magnet bodies 61 included in the magnet body unit 6.
As shown in FIGS. 11 and 12, the winding unit 20 of the winding unit 2 includes a prismatic core 30 having a substantially trapezoidal cross section, a coil 4 wound around the outer peripheral side surface of the core 30, and the core 30 and the coil 4. And a bobbin 5 disposed between the two. In addition, the winding portion 20 is annularly arranged at a position on the outer side in the radial direction of the rotation shaft 622 in which the axial direction of the rotation shaft 622 and the longitudinal direction of the core 30 are parallel.

  As shown in FIGS. 11 and 12, the bobbin 5 is provided with a prismatic side surface insulating portion 53 that covers the side surface of the core 30, and an opening that is formed at both ends of the side surface insulating portion 53 from the entire periphery to the outside. The heel part 540 is provided. A covering portion 543 that covers the opening end 10 of the gap 101 formed between the winding portion 20 and the magnet body 61 is formed at the end portion disposed on the outer peripheral side of the flange portion 540. Further, in the flange portion 540 of the bobbin 5, a flat plate-like protruding portion 544 that protrudes toward the magnet body 61 is formed at an end portion arranged in front of the rotation direction R.

Also in this example, the same effect as Example 1 can be obtained.
Moreover, in this example, although it was set as the structure which arrange | positions the coil | winding part 20 between a pair of magnet bodies 61 arrange | positioned facing each other, it arrange | positions a pair of coil | winding parts 20 facing each other and a magnet body between them 61 may be arranged, and may be constituted by one winding part 20 and one magnet body 61.

  Moreover, in the rotary electric machine 1 shown in Example 1-Example 3, although both the coating | coated part 543 and the protrusion part 544 were provided in the bobbin 5, you may provide only any one. In this case, the operational effect of the covering portion 543 or the protruding portion 544 can be obtained in the same manner as in the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 10 Open end 101 Crevice 2 Winding unit 20 Winding part 30 Core 4 Coil 5 Bobbin 543 Covering part 6 Magnet body unit 61 Magnet body

Claims (3)

  A winding unit formed by arranging a plurality of winding portions in an annular shape;
  A magnet body unit that rotates relative to the winding unit and has a magnet body disposed opposite to the winding portion;
  The winding portion includes a core made of a magnetic material, a coil wound around the core, and a bobbin interposed between the core and the coil.
  The magnet body and the core of the winding part are arranged to face each other,
  The bobbin includes a protruding portion that protrudes from a front side and a rear side of the core toward a gap between the core and the magnet body in a rotation direction of the magnet body unit.   2. The rotating electrical machine according to claim 1, wherein the bobbin includes a covering portion that covers at least a part of an opening end of a gap between the core and the magnet body.   The rotating electrical machine according to claim 2, wherein the covering portion covers 1/3 or more of the opening area at the opening end.

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