JP2007043845A - Stator structure and method for manufacturing stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator structure and a stator manufacturing method capable of preventing distortion of a case and reliably preventing rotation of a stator core.
In a stator structure in which an outer periphery of an annular stator core is held by a cylindrical case, at least one recess 5 along the axial direction is provided on the outer periphery of the stator core 2, and the recess of the case 10 is provided. The stator core 2 is held by the case 10 by deforming a part or the whole of the portion 13 facing 5 toward the recess 5.
[Selection] Figure 1

Description

  The present invention relates to an improved stator structure and an improved stator manufacturing method.

There are various proposals for a stator structure in which an annular stator is held by a cylindrical case. Among them, for example, a case in which the case itself is plastically deformed is, for example, divided in the circumferential direction. By forming an annular stator core with a plurality of cores with notches formed in a part of the side end, storing the stator core in a cylindrical case, and then caulking the case in the circumferential direction from its outer peripheral side A case in which a case and a stator core are integrated is known (for example, see Patent Document 1).
JP 2003-158833 A (Embodiment of the Invention, FIG. 1 and FIG. 2)

  However, in the above proposal, since the stator core is held by the case by caulking the case in the circumferential direction from its outer peripheral side, there is a risk that the case may be distorted. In the case of having a flange used when attaching to a lid member holding the rotor at the end, the flange is also distorted, and in the worst case, the lid member etc. cannot be attached. .

  Further, there is a concern that a gap may be formed between the notch portion of the stator core and the case, and there is a possibility that the stator core is not sufficiently prevented from rotating.

  Therefore, the present invention was devised to improve the above-described problems, and an object of the present invention is to prevent the case from being distorted and to reliably prevent the stator core from rotating. It is to provide a manufacturing method.

  In order to achieve the above-described object, the stator structure of the present invention is a stator structure in which the outer periphery of an annular stator core is held by a cylindrical case, and at least one concave portion along the axial direction is formed on the outer periphery of the stator core. And the stator core is held by the case by deforming part or all of the portion of the case facing the recess toward the recess.

Further, according to another stator structure of the present invention, in the stator structure in which the outer periphery of the annular stator core is held by a cylindrical case, at least one recess along the axial direction is provided on the outer periphery of the stator core, The stator core is held by the case by inserting a locking pin at one or more locations between the circumference and the concave portion. The stator manufacturing method of the present invention is characterized by an annular stator core. In a method for manufacturing a stator in which a cylindrical case is held, at least one or more recesses along the axial direction are provided on the outer periphery of the stator core, and a part or all of a portion of the case that faces the recesses The stator core is held by the case by being deformed toward the surface.

  Furthermore, according to another stator manufacturing method of the present invention, in the stator manufacturing method in which the outer periphery of the annular stator core is held by a cylindrical case, at least one concave portion along the axial direction is formed on the outer periphery of the stator core. And the stator core is held by the case by inserting a locking pin into one or more locations between the inner periphery of the case and the recess.

  According to the first and fourth aspects of the present invention, the portion of the case enters the recess and is crimped, so that the case firmly holds the stator core.

  And even when the rotational torque received from the rotor acts on the stator core at the time of driving the motor embodying this stator structure, the above-mentioned part has entered the concave part, so that the tip of the part after plastic deformation and the deepest part of the concave part Even if there is a gap between them, the part is deformed so as to enter the recess, so both ends of the part are always in contact with the opening end of the recess, so that the part receives the rotational torque and the Since it acts as a stop, idling of the stator core is reliably prevented.

  Furthermore, when plastically deforming the above-mentioned part of the case, there is no need to perform caulking on the entire circumference of the case, so that the deformation of the case can be reduced compared to the conventional case. As a result, when the case is attached to the lid member or the like as described above, the situation that the case does not coincide with the lid member side is avoided, and the roundness of the case is also maintained, so that the uniform quality can be maintained. A motor can be manufactured.

  According to the inventions of claims 2 and 5, the surface of the locking pin that faces the case is crimped to the inner peripheral side of the case, and the surface that faces the recess side enters the recess and is crimped. The case holds the stator core firmly.

  Even when rotational torque received from the rotor acts on the stator core during driving of the motor that embodies this stator structure, the locking pin enters the recess and takes the form of receiving the rotational torque. Since it is crimped to the periphery, it acts as a detent for the stator core and reliably prevents idling of the stator core.

  In addition, since it is not necessary to perform caulking on the entire circumference of the case, the deformation of the case due to the insertion of the locking pin is slight, and when the flange is provided, the deformation of the flange is also suppressed. When the case is attached to a member or the like, a situation where the case does not coincide with the lid member side is avoided, and the roundness of the case is maintained, so that a motor with uniform quality can be manufactured.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a plan sectional view of a stator in which a stator structure according to an embodiment of the present invention is embodied. FIG. 2 is a side sectional view of a stator in which a stator structure according to an embodiment of the present invention is embodied. FIG. 3 is a partially enlarged perspective view of the stator core. FIG. 4 is a side sectional view of a stator in which a stator structure according to a modification of the embodiment is embodied. FIG. 5 is a plan sectional view of a stator in which a stator structure according to another embodiment is embodied. FIG. 6 is a side sectional view of a stator in which a stator structure according to another embodiment is embodied.

  As shown in FIGS. 1 and 2, the stator 1 in which the stator structure according to the embodiment is embodied includes an annular stator core 2 and a case 10.

  In the following, each part will be described in detail. In the case of this embodiment, the stator core 2 is configured by arranging nine cores 3 in an annular shape, and each of the cores 3 includes magnetic pole teeth 4. A winding 7 is wound around the outer periphery of 4 via an insulating member 6.

  Therefore, the stator core 2 is composed of nine cores 3 divided in the circumferential direction, and a recess 5 having an arcuate cross section is formed on the back surface of each core 3, that is, on the outer peripheral side of the core 3. ing. In this case, there are nine cores, but the number of cores is not limited to this.

  On the other hand, the case 10 includes a cylindrical portion 9 and a flange 11 extending from the lower end of the cylindrical portion in FIG. 2, and a plurality of holes 12 are formed in the flange 11. Further, it can be fixed to a lid member or the like having a rotor (not shown) by a bolt inserted into the hole 12 or the like.

  And the stator core 2 comprised as mentioned above is inserted in the said case 10, and the part 13 which opposes the recessed part 5 of three cases 10 in that state is caulked toward the recessed part 5 from the outer peripheral side. The stator core 2 is held by the case 10 by plastic deformation.

  When nine cores 3 are annularly arranged and maintained in this state, as shown in FIG. 3, nine concave portions are arranged at equal intervals on the same circumference as the outer diameter of the stator core 2. The cores 3 can be positioned by inserting the pins 17 having the same cross section as the recesses 5 into the recess 5, and the stator core 2 can be maintained in a state in which the cores 3 are not separated. After inserting the stator core 2 into the case 10, the pins 17 can be pulled out, so that the case 10 can be easily shifted to deformation processing.

  In other words, the processing advantage of providing the recess 5 is that the above-described arrangement of the core, positioning and maintenance of the stator core state, as well as the insertion of the stator core 2 into the case 10 and the transition to deformation processing become smooth and easy. is there.

  And the said site | part 13 in case 10 goes into the recessed part 5, and is crimped | bonded by this, and case 10 will hold | maintain the stator core 2 firmly.

  At this time, it is only necessary to plastically deform only the portion 13 by caulking or the like, and since it is not necessary to perform caulking on the entire circumference of the case 10, the processing becomes easy and the processing time is shortened, resulting in a processing cost. Can be reduced.

  Furthermore, since the case 10 itself does not need to be processed in advance by providing a convex portion on the case 10 and compared with a coupling method in which the convex portion is aligned with the concave portion 5, the case 10 is inexpensive. Can be manufactured.

  When the motor that embodies this stator structure is driven, even though the rotational torque received from the rotor acts on the stator core 2, the part 13 enters the recess 5, so that the tip 14 of the part 13 after plastic deformation Even if a gap is generated between the deepest portion 15 of the recess 5, the portion 13 is deformed so as to enter the recess 5, so that both ends 16, 16 of the portion 13 are always in contact with the opening end of the recess 5. Therefore, the portion 13 receives the rotational torque and acts as a detent for the stator core 2, so that the idling of the stator core 2 is reliably prevented.

  Furthermore, when plastically deforming the portion 13 in the case 10, there is no need to roll caulk over the entire circumference of the case 10, so that the deformation of the case 10 can be reduced as compared with the conventional case, and the deformation on the flange 11 side is also reduced. As a result, when the case 10 is attached to the lid member or the like, a situation where the hole 12 of the flange 11 does not coincide with the hole on the lid member side is avoided, and the roundness of the case 10 is also maintained. Therefore, it is possible to manufacture a motor with uniform quality.

  In the present embodiment, the three portions 13 are plastically deformed. However, all the portions of the case 10 facing the concave portion 5 may be plastically deformed, or may be plastically deformed only at one location. Good.

  Further, as shown in FIG. 2, the entire portion 13 is plastically deformed toward the recess 5, but as shown in FIG. The stator core 2 may be held by the case 10 by crimping.

  Next, a stator in which the stator structure according to another embodiment shown in FIGS. 5 and 6 is embodied will be described.

  As shown in FIGS. 5 and 6, the stator 21 in which the stator structure according to another embodiment is embodied includes an annular stator core 2, a case 10, and a locking pin 25. In addition, about the member similar to the stator structure in above-mentioned one Embodiment, detailed description shall be abbreviate | omitted only to attach | subject the same code | symbol.

  Hereinafter, a portion different from the stator structure in the embodiment will be described in that the locking pin 25 is used to hold the stator core 2 in the case 10. The locking pin 25 is inserted into a gap formed by the recess 5 and the inner peripheral surface of the case 10, and its cross section is a plan view of the gap formed by the recess 5 and the inner peripheral surface of the case 10. The shape is set to be slightly larger, and the stator core 2 is compressed so that the case 10 can hold the stator core 2 when the locking pin 25 is inserted between the case 10 and the recess 5 of the stator core 2. It has become.

  Therefore, in the stator structure of another embodiment, the stator core 2 is fixed by the locking pin 25 instead of plastically deforming the case 10 itself.

  Here, when nine cores 3 are annularly arranged and maintained in this state, in one embodiment, nine cores 3 are arranged at equal intervals on the same circumference as the outer diameter of the stator core 2. Although the pin 20 having the same cross section as the concave portion 5 is used, in this other embodiment, a locking pin 25 is used instead of the pin 17.

  In this embodiment, the locking pins 25 are arranged at three locations corresponding to the recesses 5 on the same circumference as the outer diameter of the stator core 2, and the cores 3 are positioned by the three locking pins 25. Even in this case, the stator core 2 can be maintained in a state in which the cores 3 are not dispersed as in the case of the first embodiment.

  In the case of this other embodiment, the processing of the stator 21 is completed by press-fitting the stator core 2 together with the locking pins 25 into the case 10 while keeping the cores 3 in the state of constituting the stator core 2. be able to.

  Therefore, in other embodiments, the number of processing steps can be omitted.

  Further, the processing advantage of providing the recess 5 is the same as that of the above-described embodiment.

  Even in the stator structure of this other embodiment, the surface of the locking pin 25 facing the case 10 is pressure-bonded to the inner peripheral side of the case 10 and the surface facing the concave portion 5 is the concave portion 5. In this case, the case 10 holds the stator core 2 firmly.

  Furthermore, since the case 10 itself does not need to be processed in advance by providing a convex portion on the case 10 and compared with a coupling method in which the convex portion is aligned with the concave portion 5, the case 10 is inexpensive. Can be manufactured.

  Even when the rotational torque received from the rotor acts on the stator core 2 when driving the motor embodying the stator structure, the locking pin 25 enters the concave portion 5 and takes the form of receiving the rotational torque, and Since it is pressure-bonded to the inner periphery of the case 10, it acts as a detent for the stator core 2, and the idling of the stator core 2 is reliably prevented.

  Further, since it is not necessary to perform caulking on the entire circumference of the case 10, the deformation of the case 10 due to the insertion of the locking pin 25 is slight, and the deformation on the flange 11 side is also suppressed. When the case 10 is attached to the case, the situation that the hole 12 of the flange 11 does not coincide with the hole on the lid member side is avoided, and the roundness of the case 10 is maintained, so that a motor with uniform quality is manufactured. It becomes possible to do.

  In this embodiment, the locking pins 25 are inserted in three places, but the locking pins 25 may be inserted as many as the number of the recesses 5. The stator core 2 may be fixed in the case 10 with one or two locking pins 25. However, in this case, since the core 3 cannot be maintained in the stator core 2 state, the ease of processing is lost. It becomes.

  Further, the shape of the locking pin 25 may be other shapes as long as it is at least capable of preventing and fixing the stator core 2 with respect to the case 10, for example, facing the case 10 of the locking pin 25. A wedge-shaped protrusion along the axis may be provided on the surface to improve the anti-rotation effect.

  In each of the above-described embodiments, the shape of the concave portion 5 is an arc shape. However, as long as the stator core can be held by the case and the stator core can be prevented from rotating, specifically, for example, It may be a triangle or a quadrangle.

  Further, it is not necessary to provide the recesses 5 in all of the cores 3. If the recesses 5 are provided only in at least one core 3, the stator core 2 can be held and prevented by the case 10. In consideration of the above processing advantages, it is preferable to provide the recesses 5 in at least three cores 3.

  Furthermore, in each embodiment, although the scene which fixes the stator core 2 comprised by the several core 3 is assumed, not the stator core 2 comprised by the several core 3, but the stator core integral with itself is used. However, the effect of the present invention is not lost even if a recess is provided and the portion facing the recess of the case is plastically deformed or a locking pin is inserted between the recess and the inner periphery of the case.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

1 is a plan sectional view of a stator in which a stator structure according to an embodiment of the present invention is embodied. It is side surface sectional drawing of the stator with which the stator structure in one embodiment of this invention was embodied. It is a partially expanded perspective view of a stator core. It is side surface sectional drawing of the stator with which the stator structure in the modification of one Embodiment was embodied. It is a plane sectional view of the stator by which the stator structure in other embodiments was embodied. It is side surface sectional drawing of the stator with which the stator structure in other embodiment was embodied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2, 21 Stator core 10 Case 3 Core 4 Magnetic pole tooth 5 Recess 6 Insulation member 7 Winding 9 Cylindrical part 11 Flange 12 Hole 13 The part which opposes a recessed part 17 Pin 14 Protrusion 15 Deepest part 16 Both ends 25 Part Lock pin

Claims (6)

In the stator structure in which the outer periphery of the annular stator core is held by the cylindrical case, at least one or more recesses along the axial direction are provided on the outer periphery of the stator core, and part or all of the part of the case facing the recesses The stator structure is characterized in that the stator core is held by the case by deforming it toward the recess. In a stator structure in which the outer periphery of an annular stator core is held by a cylindrical case, at least one recess along the axial direction is provided on the outer periphery of the stator core, and any one between the inner periphery of the case and the recess. A stator structure characterized in that a stator core is held by a case by inserting a locking pin in more than one place. The stator structure according to claim 1 or 2, wherein the stator core includes a plurality of cores divided in the circumferential direction, and at least one or more cores are formed with recesses along the axial direction. In a method for manufacturing a stator in which an annular stator core is held by a cylindrical case, at least one or more recesses along the axial direction are provided on the outer periphery of the stator core, and a part or all of a portion of the case facing the recesses The stator core is held by the case by deforming the recess toward the recess, and a stator manufacturing method is provided. In a method for manufacturing a stator in which an outer periphery of an annular stator core is held by a cylindrical case, at least one recess along the axial direction is provided on the outer periphery of the stator core, and any one between the inner periphery of the case and the recess A stator manufacturing method, wherein a stator core is held by a case by inserting a locking pin at one or more locations. The stator manufacturing method according to claim 4, wherein the stator core includes a plurality of cores divided in a circumferential direction, and at least one or more cores are formed with recesses along the axial direction.

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