JP2013187924A - Dynamo-electric machine and stator core fixing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dynamo-electric machine in which deformation of a stator core is prevented in the radial direction, while preventing the occurrence of displacement of stator core.SOLUTION: The dynamo-electric machine includes a cylindrical housing 1 provided with a radial through hole 13 into which a fixing pin 5 is inserted, a spacer 2 placed on the inner peripheral surface of the housing, and provided with a hole 21 at a position corresponding to the through hole 13, and a stator core 3 held in the housing while being fitted therein with the spacer interposed therebetween, and provided with a recess 33 corresponding to the hole on the outer peripheral surface. A gap is formed between the tip in the insertion direction of the fixing pin entering the recess, and the bottom face of the recess. The inner peripheral part of the hole in the spacer is deformed plastically by insertion of the fixing pin and enters the recess.

Description

  The present invention relates to a rotating electric machine that fixes a stator core to a housing with a fixing pin, and a method for fixing the stator core of the rotating electric machine.

  As a conventional rotating electric machine of this type, in a motor housing structure in which the stator of a motor having a stator and a rotor is fitted and fixed inside the motor housing, a guide groove provided on the outer peripheral surface of the stator of the motor, and an external to the stator There is provided a female screw portion positioned at an appropriate position of the motor housing to be fitted, and a male screw is fastened to the female screw portion to position the stator and the motor housing and prevent mutual rotation (for example, Patent Documents). 1).

JP 2011-30351 A (page 4, FIGS. 2, 3)

  In the conventional technique as described above, since the fixing is performed by the frictional force of the screw that is screwed in, there is a concern that the inner diameter of the stator core may be deformed due to the axial force during tightening. In addition, in order to absorb the accuracy of parts such as the screw position and guide groove position of the housing and the positional deviation during assembly, a guide groove on the outer periphery of the stator, a male screw outer diameter, and a constant clearance are provided, but the screw is loosened. In this case, the stator core may be displaced by the clearance between the screw tip and the guide groove.

  The present invention has been made in order to solve the above-described problems. The rotating electrical machine in which the radial deformation of the stator core is prevented and the reliability of fixing the stator core is improved, and the stator core of the rotating electrical machine is fixed. The purpose is to get the method.

  A rotating electrical machine according to the present invention includes a cylindrical housing provided with a radial through hole into which a fixing pin is inserted, and a hole provided at an inner peripheral surface of the housing and corresponding to the through hole. A rotating electrical machine comprising: the interposed member, and a stator core that is held in the housing by the interposed member and is provided with a concave portion on an outer peripheral surface corresponding to the hole. A gap is formed between the front end portion of the fixing pin inserted in the insertion direction and the bottom surface of the concave portion, and the inner peripheral portion of the hole of the intervention member is made plastic by insertion of the fixing pin. It is deformed and entered into the recess.

  Also, the stator core fixing method for a rotating electrical machine according to the present invention is a recess for receiving the distal end portion of the fixing pin on the outer peripheral surface with respect to a cylindrical housing provided with a radial through hole into which the fixing pin is inserted. A stator core fixing method for a rotating electrical machine that fixes a stator core having a pin, wherein an interposition member having a hole smaller in diameter than an outer diameter of the fixing pin is provided between an inner peripheral surface of the housing and an outer peripheral surface of the stator core. Is inserted so that the small-diameter hole, the through hole, and the recess coincide with each other, and when the fixing pin is inserted into the recess from the through hole, the tip of the fixing pin The inner peripheral portion of the small-diameter hole is plastically deformed to enter the recess of the stator core, while a gap is provided between the fixing pin and the bottom of the recess.

  In the rotating electrical machine according to the present invention, when the fixing pin inserted into the concave portion of the stator core from the through hole of the housing through the hole of the interposed member passes through the hole of the interposed member, the inner peripheral portion of the hole Since the stator core is fixed to the housing by being plastically deformed to enter the concave portion of the stator core, the stator core is securely fixed. In addition, in the fixed state, a gap is formed between the tip of the fixed pin that has entered the concave portion of the stator core and the bottom surface of the concave portion, so the fixed pin is not in direct contact with the stator core. The radial deformation of the stator core is prevented.

  Further, in the stator core fixing method for a rotating electrical machine according to the present invention, when the fixing pin is inserted into the recess of the stator core from the through hole of the housing, the tip of the fixing pin has an inner diameter of the small diameter hole. While the peripheral portion is plastically deformed to enter the recess of the stator core, a gap is provided between the fixing pin and the bottom of the recess, so that the stator core is prevented from being deformed in the radial direction and the stator core is securely fixed. Reliability is also improved.

Sectional drawing which shows roughly the rotary electric machine which concerns on Embodiment 1 of this invention. The schematic sectional drawing which looked at the fixing | fixed part of the stator core shown by FIG. 1 from the axial direction. FIG. 3 is an enlarged cross-sectional view of the fixing portion shown in FIG. 2, where (a) shows a state before the fixing pin is assembled, and (b) shows a state after the fixing pin is assembled. 4A and 4B are detailed cross-sectional views showing the main part of the fixing method and the fixing structure shown in FIG. 3, wherein (a) shows before plastic deformation of the interposed member, and (b) shows after plastic deformation by the fixing pin. It is detailed sectional drawing which shows the principal part of the fixing method and fixing structure in the fixing | fixed part of the stator core of the rotary electric machine which concerns on Embodiment 2 of this invention, (a) is before plastic deformation of an interposed member, (b) is fixing. It shows after plastic deformation by a pin. It is detail sectional drawing which shows the principal part of the fixing method and fixing structure in the fixing | fixed part of the stator core of the rotary electric machine which concerns on Embodiment 3 of this invention, (a) is before plastic deformation of an interposed member, (b) is fixing. It shows after plastic deformation by a pin. It is detail sectional drawing which shows the principal part of the fixing method and fixing structure in the fixing | fixed part of the stator core of the rotary electric machine which concerns on Embodiment 4 of this invention, (a) is before plastic deformation of an interposed member, (b) is fixing. It shows after plastic deformation by a pin.

Embodiment 1 FIG.
1 is a cross-sectional view schematically showing a rotary electric machine according to Embodiment 1 of the present invention, FIG. 2 is a schematic cross-sectional view of a stator core fixing portion shown in FIG. 1 viewed from the axial direction, and FIG. FIG. 2 is an enlarged cross-sectional view of the fixing portion shown in FIG. 2, (a) before assembly of the fixing pin, and (b) after assembly of the fixing pin. 4A and 4B are detailed cross-sectional views showing the main part of the fixing method and the fixing structure in the fixing part shown in FIG. 3, wherein FIG. 4A is before plastic deformation of the interposed member, and FIG. 4B is after plastic deformation by the fixing pin. Indicates. In the figure, a rotating electric machine includes a cylindrical housing 1 made of an aluminum frame, a cylindrical stator core 3 fixed to an inner peripheral surface of the housing 1 via an interposed member 2 made of a cylindrical ring, a housing 1. A bracket 11 fixed to both ends of the shaft, a shaft 4 rotatably supported on the bracket 11 via a bearing 12, a rotor core 41 which is attached to the shaft 4 and generates torque by electromagnetic interaction with the stator core 3 and the like. I have.

  The stator core 3 is made of an iron-based material such as a silicon steel plate, for example, and a coil 32 is wound around a magnetic pole 31 on the inner peripheral side. 2 and 3, the illustration of the coil 32 is omitted. On the outer peripheral surface of the stator core 3, recesses 33 each having a trapezoidal groove in parallel with the axial direction used at the time of winding and having a narrow opening and a wide bottom are provided corresponding to each magnetic pole 31. The housing 1 has a plurality of radial through holes 13 into which the fixing pins 5 for restricting the movement of the stator core 3 in the rotational direction are inserted corresponding to the positions of the predetermined recesses 33 (in this example, three in the circumferential direction). ) Is provided. The interposition member 2 is formed of a steel plate in a cylindrical shape, and a hole 21 having a diameter smaller than the inner diameter of the through hole 13 is provided at a position corresponding to the through hole 13. The stator core 3 is fitted and held coaxially by shrink fitting or the like on the inner peripheral surface side.

  At this time, the holes 21 installed in the interposition member 2 are assembled in a state where the positions of the recesses 33 used at the time of winding provided on the outer periphery of the stator core 3 are aligned. Here, as shown in FIGS. 3A and 4A, the inner diameter of the hole 21 provided in the interposed member 2 is the minimum difference dimension of the recess 33 of the stator core 3 (in this example, the edge of the groove). The hole 21 is called a small diameter hole 21 for the sake of convenience. In order to facilitate plastic deformation of the small-diameter hole 21, the peripheral portion A on the housing 1 side (left side in the figure) is chamfered as shown in FIG. It is formed thinner than the thickness T (shown in FIG. 5 described later). Further, the outer peripheral edge portion of the distal end portion 5a of the fixing pin 5 is chamfered to form an inclined surface B. Other configurations are the same as those of the conventional one, and thus the description thereof is omitted.

  Next, the fixing structure and fixing method of the stator core 3, which is a typical characteristic part of the present invention, will be described. First, the interposed member 2 and the stator core 3 are assembled to the housing 1 so that the through hole 13 of the housing 1, the hole 21 of the interposed member 2, and the center position C of the concave portion 33 of the stator core 3 match. Then, the fixing pin 5 is press-fitted into the through hole 13 from the outer diameter side of the housing 1. FIG. 4A corresponds to a state in which the distal end portion 5 a of the fixing pin 5 reaches the front of the hole 21 of the interposition member 2.

  Thereafter, when the fixing pin 5 is further press-fitted, it is press-fitted into the small-diameter hole 21 of the intervention member 2. At this time, since the vicinity of the small-diameter hole 21 is dimensioned so as to be plastically deformed by press-fitting the fixing pin 5, it is plastically deformed by the outer peripheral surface of the distal end portion of the fixing pin 5, and the inner peripheral portion of the small-diameter hole 21 is The stator core 3 enters the recess 33 in a form sandwiched between the fixing pin 5 and the edge of the recess 33, and a locking portion 21 </ b> X in the rotational direction with respect to the stator core 3 is formed. FIG. 4B corresponds to the state in which the press-fitting of the fixing pin 5 is completed.

  As described above, according to the first embodiment, when the fixing pin 5 is press-fitted into the through hole 13 of the housing 1, the inner peripheral portion of the small-diameter hole 21 of the interposed member 2 is plastically deformed by the fixing pin 5. Since the interposition member 2 is partially inserted into the recessed portion 33 of the fixing pin 5 and the stator core 3 to prevent the stator core 3 from moving in the rotational direction, the fixing pin 5 and the stator core 3 are coupled to each other. Will become stronger and reliability will be improved. For this reason, as in the case of the fixing screw in the prior art, the screw is loose and a clearance is generated, and the stator core is not displaced. Further, the fixed pin 5 and the stator core 3 are not in direct contact with each other in a fixed state, and a gap is formed between the front end portion 5a of the fixed pin 5 and the bottom surface of the concave portion 33 of the stator core 3, so that deformation of the stator core 3 is suppressed. It is possible to prevent changes in characteristics due to deformation. In addition, durability is improved.

  In addition, although the case where a total of three fixing pins 5 were provided at three locations in the circumferential direction has been described, the number, installation position, and the like can be appropriately set according to the fixing force. Moreover, although it fixed using the recessed part 33 which consists of a groove | channel parallel to the axial direction formed in the outer peripheral surface of the stator core 3, it is not limited to this. In the case of the stator core not provided with the groove as described above, it can be similarly configured by providing, for example, a bottomed round hole or the like in the outer peripheral portion of the stator core. Further, the fixing pin 5 may have an oval shape in addition to a circular cross section.

Embodiment 2. FIG.
FIG. 5 is a detailed sectional view showing a fixing method and a main part of a fixing structure in a fixing portion of a stator core of a rotary electric machine according to Embodiment 2 of the present invention, (a) is before plastic deformation of an interposed member, (b ) Shows after plastic deformation by a fixing pin. As shown in FIG. 5 (a), the small-diameter hole 21A of the intervention member 2 has the same inner diameter as that of the first embodiment shown in FIG. 4 (a), but is fixed to the outer diameter side (left side in the figure). A step portion 22 having a diameter larger than the diameter of the pin 5 is formed, and the thickness t of the portion into which the fixing pin 5 is press-fitted is formed thinner than the thickness T of the other interposed member 2. Other configurations are the same as those of the first embodiment.

  In the second embodiment configured as described above, the fixing pin 5 has a smaller diameter than the interposed member 2 by making the thickness t of the small diameter hole 21A thinner than the thickness T of the other part of the interposed member 2. The force at the time of plastically deforming the inner peripheral portion of the hole 21A can be reduced, and the further effect added to the first embodiment that the assembling property is improved can be obtained.

Embodiment 3 FIG.
6 is a detailed cross-sectional view showing a fixing method and a main part of a fixing structure in a stator core fixing portion of a rotary electric machine according to Embodiment 3 of the present invention, in which (a) is before plastic deformation of an interposed member, (b ) Shows after plastic deformation by a fixing pin. In FIG. 6A, the fixing pin 5A has an outer diameter of the press-fitted portion that is smaller toward the stator core 3 side, that is, the inclined surface B1 of the tip portion 5a is longer than that of the first embodiment shown in FIG. 4A. It is formed in a taper shape. The shape of the small-diameter hole 21B of the intervention member 2B is substantially the same as that of FIG. 4A, but in this example, the inner diameter is smaller than that of FIG. Is formed. Other configurations are the same as those of the first embodiment.

  In the third embodiment configured as described above, the plastic deformation portion of the interposed member 2B increases as the fixing pin 5A is press-fitted, and the vicinity of the inner peripheral portion of the small-diameter hole 21B of the interposed member 2B is the stator core. Since the width W in the rotation direction of the engaging portion 21X made of the interposition member 2B is increased as shown in FIG. 6B, the fixing force is further strengthened. The further effect added to the form 1 is acquired.

Embodiment 4 FIG.
FIG. 7 is a detailed cross-sectional view showing the main part of the fixing method and fixing structure in the fixing portion of the stator core of the rotating electrical machine according to Embodiment 4 of the present invention, (a) is before plastic deformation of the interposed member, (b ) Shows after plastic deformation by a fixing pin. In FIG. 7A, the small-diameter hole 21C of the intervention member 2C is formed in a tapered shape so that the diameter becomes smaller toward the stator core 3 side, that is, the plastic deformation portion increases. Other configurations are the same as those of the third embodiment.

  In the fourth embodiment configured as described above, since the plastic deformation portion of the interposed member 2C is increased in substantially the same manner as in the third embodiment, the concave portion of the stator core 3 due to the press-fitting of the fixing pin 5A. As shown in FIG. 7 (b), the width and depth of the locking portion 21X in the rotational direction are increased as in the third embodiment, and the fixing force is further strengthened. A further effect in addition to the first embodiment can be obtained.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted. For example, although the example in which the columnar fixing pins 5 and 5A are press-fitted and fixed to the housing 1 has been shown, the same effect can be obtained by a structure in which the fixing pin 5 has a male screw structure and is fixed to the housing 1 by screws. Moreover, although the interposed member 2 was comprised by the cylindrical ring, it is not necessarily limited to this. For example, when fixing in one place with respect to the rotation direction, the interposition member 2 can be appropriately changed, such as being configured by a belt-like plate material. Needless to say, the material of the constituent member is not particularly limited.

  DESCRIPTION OF SYMBOLS 1 Housing, 13 Through hole, 2, 2B, 2C Interposition member, 21, 21A, 21B, 21C (small diameter) hole, 21X Locking part, 22 Step part, 3 Stator core, 33 Recessed part (groove), 4 Shaft, 5, 5A fixing pin, 5a tip, A peripheral edge, B, B1 inclined surface, C center position, L minimum passing dimension (groove width), W locking part width.

Claims (10)

  A cylindrical housing provided with a radial through hole into which the fixing pin is inserted, an interposed member disposed on the inner peripheral surface of the housing and provided with a hole at a position corresponding to the through hole, A rotating electrical machine comprising a stator core that is held in the housing by an interposition member and is provided with a recess on an outer peripheral surface corresponding to the hole, the fixing pin entering the recess A gap is formed between the front end portion in the insertion direction and the bottom surface of the recess, and the inner peripheral portion of the hole of the intervention member is plastically deformed by insertion of the fixing pin and enters the recess. A rotating electric machine characterized by being made.   The rotating electrical machine according to claim 1, wherein the interposition member is formed of a ring that is held in the housing by being fitted therein.   The said concave part of the said stator core consists of a groove | channel where the cross section formed in the outer peripheral part of this stator core parallel to the axial direction is trapezoid, and an opening part is narrow and the bottom part side is wide, The Claim 1 or Claim 2 characterized by the above-mentioned. The rotating electrical machine described.   The rotating electrical machine according to any one of claims 1 to 3, wherein a minimum difference dimension of the recess is formed larger than a diameter of the hole provided in the intervention member.   5. The rotating electrical machine according to claim 1, wherein a distal end portion in the insertion direction of the fixing pin is inclined so as to have a smaller diameter toward the distal end side.   The hole provided in the intervention member is formed to have a smaller diameter than the through hole, and a thickness of a peripheral edge portion is formed to be thinner than a portion other than the hole. The rotating electrical machine according to any one of claims 1 to 5.   This is a method for fixing a stator core of a rotating electrical machine, in which a stator core having a recess for receiving the tip end portion of the fixing pin is fixed to an outer peripheral surface of a cylindrical housing having a radial through hole into which a fixing pin is inserted. An interposition member having a hole smaller in diameter than the outer diameter of the fixing pin is arranged between the inner peripheral surface of the housing and the outer peripheral surface of the stator core, and the small diameter hole, the through hole, and the concave portion coincide with each other. When the fixing pin is inserted into the recess from the through hole, the inner peripheral portion of the small-diameter hole of the interposed member is plastically deformed at the distal end portion of the fixing pin, and the stator core A method of fixing a stator core of a rotating electrical machine, wherein a clearance is provided between the fixing pin and the bottom of the recess while entering the recess.   The method for fixing a stator core of a rotating electric machine according to claim 7, wherein a thickness of the small diameter hole portion of the interposition member is formed to be thinner than a thickness other than the small diameter portion.   9. The rotating electrical machine according to claim 7, wherein an inner peripheral surface of the small-diameter hole of the interposed member is an inclined surface having a small diameter from the housing side toward the stator core side. Stator core fixing method.   The method for fixing a stator core of a rotating electrical machine according to any one of claims 7 to 9, wherein an outer peripheral surface of the fixing pin is inclined so that a diameter thereof becomes smaller toward a distal end side in an insertion direction.

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