JP2009201304A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine having a stator to which a plurality of plates can be fixed easily without a protrusion formed on the surface of the stator made up of the plurality of plates. <P>SOLUTION: The rotary electric machine includes a stator made up of the plurality of plates, which are made of magnetic material and laminated in an axial direction. A protrusion 45 along the axial direction is formed on one face of the side plate members 41A, 41B arranged on both sides of the stator in the axial direction, and a through-hole 46, to which the protrusion of the side plate member can be passed, is formed at a middle plate member 42 other than the side plate member of the stator. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

Conventionally, rotating electrical machines such as a magnet generator and a motor have a stator and a rotor. The stator generally has a structure in which plate members made of a magnetic material or the like are laminated. Further, there is known a structure in which laminated plate materials are fastened and fixed by rivet caulking and integrated as a stator core (see, for example, Patent Document 1). Here, the stator core of Patent Document 1 includes a plurality of first core sheets and second core sheets formed by pressing an electromagnetic steel sheet, and a core end plate that is thicker than the first and second core sheets. Are integrated by crimping the ends of the rivets passed through the rivet holes.
JP 2007-252076 A

When two or more types of plate materials having different plate thicknesses are stacked like the stator core of Patent Document 1 described above, it is common to fasten and fix using rivets. This is because if the plate materials having different plate thicknesses are stacked, it is not possible to perform automatic caulking in the same mold.
However, the stator core configured as described above requires parts such as rivets, and has a problem that the number of parts is larger than that produced by automatic caulking.
In addition, a dedicated jig (mold) is necessary to manage the rivet caulking height and the like.
Further, if the method of laminating the plate materials (such as the thickness of the stator core) is different, there is a problem that the type of rivet needs to be changed and product management becomes complicated.
Further, since the head of the rivet protrudes from the surface of the stator core, it is necessary to process the members attached adjacently, resulting in a problem that the production efficiency is lowered and the manufacturing cost is increased.

  Accordingly, the present invention has been made in view of the above circumstances, and a stator that can easily fix a plurality of plate members without forming protrusions on the surface of the stator made of a plurality of plate members. The rotary electric machine which has is provided.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a rotating electrical machine having a stator configured by laminating a plurality of plate materials made of a magnetic material in the axial direction, in the axial direction of the stator. A projection along the axial direction is formed on one surface of the side plate arranged on both sides, and the projection of the side plate can be inserted into an intermediate plate other than the side plate of the stator. A through hole is formed.

  By configuring in this way, the positions of the protrusions of the side plate member and the through hole of the intermediate plate member are aligned, and when the side plate member is pressed against the intermediate plate member, the protrusion is press-fitted into the through hole, and the intermediate between the side plate member and the intermediate plate member. The plate material is fixed. Therefore, a plurality of plate materials can be easily fixed. In addition, since the side plate has a simple structure in which protrusions are formed only on the surface on the intermediate plate side, it protrudes from the surface of the stator when a plurality of plates are fixed to manufacture the stator. Part is not formed. Therefore, it is not necessary to perform processing for avoiding interference with the protruding portion on the member arranged so as to be in close contact with the stator, and the stator and the member can be reliably connected. That is, the production efficiency can be improved and the manufacturing cost can be reduced.

The invention described in claim 2 is characterized in that the side plate material is formed thicker in the axial direction than the intermediate plate material.
With this configuration, the stator formed by laminating plate materials having different plate thicknesses is conventionally fastened and fixed by rivet caulking, but a plurality of plate materials can be fixed without using rivets. .

The invention described in claim 3 is characterized in that the shapes of the protrusion and the through hole are different in a horizontal plane orthogonal to the axial direction.
With this configuration, when the protrusion is press-fitted into the through hole, the protrusion can be press-fitted while the protrusion and the through hole are in point contact. Therefore, the contact resistance during press-fitting can be reduced. In addition, the holding strength of the protrusion can be improved after the press-fitting.

According to a fourth aspect of the present invention, in the horizontal plane, the protrusion is formed in a circular shape, the through hole is formed in a polygonal shape, and when the protrusion is press-fitted into the through hole, the protrusion is It is characterized by being configured to contact each side of the through hole.
With this configuration, the protrusion can be held at each side of the through hole, and thus the holding strength of the protrusion can be reliably ensured. In addition, since the protrusions are manufactured in a circular shape, product accuracy can be easily ensured, and production efficiency can be improved.

The invention described in claim 5 is characterized in that, in a horizontal plane, the protrusion is formed in a substantially perfect circle shape, and the through hole is formed in a substantially square shape.
With this configuration, if the central axis of the protrusion and the through hole coincide with each other in the horizontal plane, the protrusion can be reliably held by point contact on the four sides of the through hole. Moreover, since the through hole is formed in a square shape, the intermediate plate can be easily manufactured.

According to a sixth aspect of the present invention, the through holes are formed at substantially equal intervals in the circumferential direction on a concentric circle of the intermediate plate material, and the top portions of the through holes having a regular polygonal shape are the intermediate plate material. The through hole is formed so as to coincide with the radial direction.
By configuring in this way, the positions of the two points where the two opposite sides of the through hole are in point contact with the projection are shifted from the same radial direction of the stator. Therefore, when the stator vibrates in the radial direction in the horizontal plane, the point contact portion between the protrusion and the through hole acts in a direction to suppress the positional deviation between the side plate member and the intermediate plate member with respect to the vibration. That is, a high-quality stator that is resistant to vibration can be easily manufactured.

  According to the present invention, when the side plate material and the through hole of the intermediate plate material are aligned, and the side plate material is pressed against the intermediate plate material, the protrusion is press-fitted into the through hole, and the side plate material and the intermediate plate material are Is fixed. Therefore, there is an effect that a plurality of plate materials can be easily fixed. In addition, since the side plate has a simple structure in which protrusions are formed only on the surface on the intermediate plate side, it protrudes from the surface of the stator when a plurality of plates are fixed to manufacture the stator. Part is not formed. Therefore, there is no need to perform processing for avoiding interference with the protruding portion on the member arranged so as to be in close contact with the stator, and there is an effect that the stator and the member can be reliably connected. That is, the production efficiency can be improved and the manufacturing cost can be reduced.

Next, an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a magnet generator will be described as an example.
As shown in FIGS. 1 and 2, the magnet generator 1 is an outer rotor type generator used in, for example, a motorcycle, and includes a rotor 3 fixed to the tip of a crankshaft 2 of the engine, And a stator 4 fixed to the case 7.

  The rotor 3 has a bottomed cylindrical rotor yoke 30. The end portion (bottom wall) 31 of the rotor yoke 30 is provided with a boss portion 5 substantially at the center in the radial direction. The boss portion 5 is formed so as to protrude from the end portion 31 toward the inside (the upper side in FIG. 2). A through hole 6 is formed in the center of the boss portion 5, and the crankshaft 2 is inserted and fixed in the through hole 6. Further, a flange portion 33 for attaching a clutch member (not shown) is formed outside the end portion 31 (lower side in FIG. 2). Further, a plurality of oil drain holes (through holes) 35 are formed at substantially equal intervals in the circumferential direction between the flange portion 33 and the peripheral wall 32 in the end portion 31. That is, the oil drain hole 35 is formed in the peripheral portion of the end portion 31 and is formed at a position that does not interfere with the clutch attached to the end portion 31 side of the rotor yoke 30 in plan view.

  On the peripheral wall 32 of the rotor yoke 30, a plurality of permanent magnets 8 are arranged on the inner peripheral wall 32 a side so that magnetic poles are alternately arranged in the circumferential direction. On the other hand, on the outer peripheral wall 32b side of the peripheral wall 32, a plurality of retractors (convex portions) 9 for detecting the ignition timing of the engine and the like are integrally formed at equal intervals in the circumferential direction.

  Here, the permanent magnet 8 is arranged so as to be placed on a magnet holder 51 provided so as to contact the inner peripheral wall 32 a of the rotor yoke 30. The magnet holder 51 is a ring-shaped member made of, for example, resin. On the upper surface of the magnet holder 51, protrusions 54 that protrude vertically upward at substantially equal intervals in the circumferential direction are formed. By positioning the permanent magnet 8 between the adjacent protrusions 54, the permanent magnet 8 can be easily positioned.

  In the engine to which the magnet generator 1 is attached, in order to control the ignition timing and the like, information on the rotational speed of the engine and information on the rotational angle of the crankshaft 2 are required. For this reason, a pulse generator (not shown) that generates a pulse signal as the crankshaft 2 rotates is used. The pulse generator is disposed so as to face the outer peripheral surface side of the rotor yoke 30, that is, the reluctator 9. A pulse signal (positive voltage pulse and negative voltage pulse) is generated from the pulse generator by the edge portion (corner portion) of the reluctator 9 crossing the pickup of the pulse generator, and this is supplied to a control unit (CDI unit not shown). Etc.) can be obtained, and information on the rotational speed of the engine and information on the rotational angle of the crankshaft 2 can be obtained.

  The stator 4 has an annular stator core 17. The stator core 17 is formed by laminating magnetic plate materials in the axial direction, and a boss hole 15 into which the boss portion 5 can be inserted is formed at the center. The stator core 17 is formed with a plurality of screw holes 20 (four in the present embodiment) along the circumferential direction for fastening and fixing the stator 4 to the engine case 7. Furthermore, the stator core 17 is provided with a plurality of teeth 16 extending radially outward in the circumferential direction at equal intervals. An insulator 24 is attached to each of the teeth 16, and an armature coil 18 is wound through the insulator 24.

  The armature coil 18 is formed by winding a predetermined number of coils around the teeth 16, and the terminal portion thereof is led out to the vicinity of the drawing position of the harness 26 including the three power generation output lead wires 19. Yes. Each terminal portion of the armature coil 18 and each terminal portion of the power generation output lead wire 19 are joined by being soldered in a superposed state or by crimping using a crimp sleeve. An insulating cap 22 fixed to the stator core 17 is attached to this joint portion.

  In the magnet generator 1 configured as described above, when the rotor 3 rotates together with the crankshaft 2, the permanent magnet 8 rotates around the stator 4, so that an induced electromotive force is generated in the armature coil 18. The current flowing through the armature coil 18 is supplied to a battery (not shown) and attached electric equipment via a power generation output lead wire 19.

Next, the structure of the stator core 17 will be described.
As shown in FIG. 3, the stator core 17 is a laminate of a plurality of plate materials made of a magnetic material. In the present embodiment, the stator core 17 includes side plate members 41 (41A and 41B) disposed on both sides (upper and lower ends in FIG. 3), and an intermediate plate member 42 disposed between the side plate members 41A and 41B. It consists of The side plate 41 is formed thicker in the direction along the axis than the intermediate plate 42. Further, the side plate member 41 and the intermediate plate member 42 are formed with substantially the same outer shape in plan view.

  As shown in FIG. 4, the side plate member 41 forms a part of the stator core 17, and the above-described teeth 16 and screw holes 20 are formed. Here, the side plate member 41 has a circular boss hole 15 formed around the axis, and a core portion 43 is formed outside the boss hole 15 in the radial direction. The teeth 16 extend radially at substantially equal intervals in the circumferential direction with the core portion 43 as a base end. The screw hole 20 is formed in the core portion 43. Projections 45 projecting vertically upward with respect to the core portion 43 are formed on the core portion 43 at substantially equal intervals in the circumferential direction only on one surface (three locations in this embodiment). The protrusions 45 are formed on the concentric circle of the core part 43 at substantially equal intervals in the circumferential direction. The protrusion 45 is formed in a circular cylindrical shape in plan view, and its tip is chamfered. The surface opposite to the surface on which the protrusion 45 is formed is formed as a substantially flat surface.

  As shown in FIG. 5, the intermediate plate member 42 forms a part of the stator core 17, similarly to the side plate member 41, and the above-described teeth 16 and screw holes 20 are formed. Here, the intermediate plate member 42 has a circular boss hole 15 formed around the axis, and a core portion 43 is formed on the radially outer side of the boss hole 15. The teeth 16 extend radially at substantially equal intervals in the circumferential direction with the core portion 43 as a base end. The screw hole 20 is formed in the core portion 43. In the core portion 43, through holes 46 are formed at substantially equal intervals in the circumferential direction at positions corresponding to the protrusions 45 of the side plate member 41 described above (three locations in this embodiment). The through hole 46 is formed in a square shape in plan view, and is formed in such a size that the four sides of the through hole 46 and the projection 45 are held in point contact when the projection 45 is inserted. Moreover, the through-hole 46 is formed in the direction in which two opposing top portions are positioned in the same radial direction.

Next, a method for manufacturing the stator core 17 will be described.
As shown in FIG. 6, in order to manufacture the stator core 17, first, a predetermined number of intermediate plate members 42 are laminated. At this time, the lamination is performed such that the positions of the screw holes 20 and the through holes 46 formed in the core portion 43 coincide with the axial direction. After the intermediate plate 42 is laminated, the side plates 41A and 41B are press-fitted from both sides thereof. That is, the protrusions 45 of the side plate members 41A and 41B are press-fitted so as to be inserted into the through holes 46 of the intermediate plate member 42, and the stator core 17 is manufactured if the side plate members 41A and 41B can be press-fitted to a predetermined position. It becomes.
The stator core 17 manufactured in this way is manufactured as the stator 4 by, for example, winding an armature coil 18. Thereafter, the stator core 17 is disposed in the rotor yoke 30 and fastened and fixed to the engine case 7 using the screw holes 20.

  According to this embodiment, the protrusions 45 are formed on the side plate members 41 (41A, 41B) located on both sides of the stator core 17, and correspond to the protrusions 45 of the intermediate plate member 42 sandwiched between the side plate members 41A, 41B. Since the through holes 46 are formed at the positions where the protrusions 45 of the side plate members 41A and 41B are aligned with the through holes 46 of the intermediate plate member 42 and the side plate members 41A and 41B are pressed against the intermediate plate member 42, the protrusions 45 Is press-fitted into the through hole 46, and the side plate members 41A and 41B and the intermediate plate member 42 are fixed. Therefore, the stator core 17 can be manufactured by easily fixing the plurality of plate members 41 and 42. Further, since the side plate members 41A and 41B have a simple configuration in which the projection 45 is formed on the surface on the intermediate plate member 42 side, the stator core 17 is manufactured by fixing the plurality of plate members 41 and 42. In this case, no protrusion is formed on the surface of the stator core 17. Therefore, there is no need to process the engine case 7 arranged so as to be in close contact with the stator core 17 (stator 4) to avoid interference with the protruding portion, and the stator 4 and the case 7 Can be connected. That is, the production efficiency can be improved and the manufacturing cost can be reduced.

  Further, as in the present embodiment, when the plate thicknesses of the side plate material 41 and the intermediate plate material 42 are different from each other, they are conventionally fastened and fixed by rivet caulking, but by fixing with the protrusion 45 and the through hole 46, The plurality of plate members 41 and 42 can be fixed without using rivets.

  Further, since the protrusion 45 is formed in a columnar shape and the through hole 46 is formed in a square shape in plan view, when the protrusion 45 is press-fitted into the through hole 46, the protrusion 45 and the through hole 46 are pointed at each side of the through hole 46. The protrusion 45 can be press-fitted while contacting. Therefore, the contact resistance during press-fitting can be reduced. Further, the holding strength of the protrusion 45 can be improved after the press-fitting.

  In addition, since the protrusion 45 is formed in a columnar shape, it is easy to ensure product accuracy and improve production efficiency.

  Further, the through holes 46 are formed at substantially equal intervals in the circumferential direction on the concentric circles of the core portion 43 of the intermediate plate member 42, and a pair of opposing top portions of the through holes 46 formed in a square shape are the cores of the intermediate plate member 42. Since the through hole 46 is formed so as to coincide with the radial direction of the portion 43, the positions of the two points where the two opposite sides of the through hole 46 and the protrusion 45 are in point contact are the positions of the stator core 17 (stator 4). Arranged from the same radial direction. Therefore, when the stator 4 vibrates in the radial direction in the horizontal plane, the point contact portion between the protrusion 45 and the through hole 46 suppresses the positional deviation between the side plate member 41 and the intermediate plate member 42 with respect to the vibration. Act on. That is, the high-quality stator 4 that is strong against vibration can be easily manufactured.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. That is, the specific shape, configuration, and the like given in the present embodiment are merely examples, and can be changed as appropriate.
For example, although the present embodiment has been described using a magnet generator, the present invention may be employed in a motor that forms a stator core by stacking a plurality of plate members.
Moreover, although this embodiment demonstrated the case where a processus | protrusion was circular and the through-hole was formed in the square, if it is a structure where a processus | protrusion and a through-hole are hold | maintained by point contact, other shapes (for example, refer FIG. 7) But you can.

It is a top view of the magnet generator in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is the B section enlarged view of FIG. It is a top view of the side part board material in the embodiment of the present invention. It is a top view of the intermediate board material in the embodiment of the present invention. It is a fragmentary sectional view which shows the manufacturing process of the stator core in embodiment of this invention. It is explanatory drawing which shows another structure of the protrusion and through-hole in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Magnet generator (rotary electric machine) 3 ... Rotor 4 ... Stator 8 ... Permanent magnet 18 ... Armature coil 30 ... Rotor yoke 31 ... End part (bottom wall) 41 (41A, 41B) ... Side part plate material 42 ... Middle Plate material 45 ... Projection 46 ... Through hole

Claims (6)

In a rotating electrical machine having a stator configured by laminating a plurality of plate materials made of a magnetic material in the axial direction,
Projections along the axial direction are formed on one surface of the side plate disposed on both sides in the axial direction of the stator,
A rotating electrical machine, wherein a through-hole through which the protrusion of the side plate material can be inserted is formed in an intermediate plate material other than the side plate material of the stator.   The rotating electrical machine according to claim 1, wherein the side plate material is formed thicker in the axial direction than the intermediate plate material.   3. The rotating electrical machine according to claim 1, wherein the protrusions and the through holes have different shapes in a horizontal plane orthogonal to the axial direction. In the horizontal plane, the projection is formed in a circular shape, the through hole is formed in a polygonal shape,
The rotating electrical machine according to claim 3, wherein the protrusion is configured to contact each side of the through hole when the protrusion is press-fitted into the through hole.   5. The rotating electrical machine according to claim 4, wherein the protrusion is formed in a substantially circular shape in a horizontal plane, and the through hole is formed in a substantially square shape. The through holes are formed at substantially equal intervals in the circumferential direction on a concentric circle of the intermediate plate material,
6. The rotating electrical machine according to claim 4, wherein the through hole is formed so that a top portion of the through hole having a regular polygonal shape is coincident with a radial direction of the intermediate plate member.

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