JP2013128409A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine in which a rotor and a stator can be inserted without allowing them to be interfered with each other and the inertia of a guide member is reduced after inserting the rotor into the stator.SOLUTION: A rotary electric machine comprises: a cylindrical frame 41; a stator 30 held in the frame; brackets 42 of which outer peripheries are mounted to the ends of the frame 42, respectively, and of which inner peripheries hold bearings 43 respectively; a rotor 20 consisting of a shaft 22 supported by the bearings 43 and a rotor core 21 supported by the shaft, the rotor core being arranged in the stator 30; and guide members 44 each of which has a screw hole 44a, is mounted to the rotor core 21 so as to radially project from the outer periphery of the rotor core when inserting the rotor into the stator 30, in which, after insertion, a withdrawal screw 47 inserted from a screw-through-hole 42a of the bracket 42 is screwed into the screw hole 44a, and which is removed from the rotor core 21 by pulling out the withdrawal screw 47.

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, a relatively small general-purpose induction motor or the like having a small gap between the rotor and the stator, or a permanent magnet type rotating electric machine or the like that has a magnetic attraction force between the rotor and the stator However, when the rotor is inserted into the stator, the concentricity between the rotor and the stator cannot be maintained, and the rotor interferes (contacts) with the stator.

  In order to solve this problem, assembling the rotor and the stator while maintaining concentricity, an end plate having a diameter larger than the outer diameter of the rotor and smaller than the inner diameter of the stator is attached to the end of the rotor. Is inserted into the stator. According to this method, when the rotor is inserted into the stator, the concentricity between the rotor and the stator can be maintained, so that it is possible to prevent the rotor from interfering with the stator and taking time for assembly. Can do.

  Conventionally, a permanent magnet motor is housed in a housing integrally formed in a cylindrical shape, and the permanent magnet motor is disposed on the inner peripheral surface of the housing, and is rotatably disposed inside the stator. A plate having a plurality of protrusions is disposed on at least one of axial end portions of the rotor core of the rotor, and the permanent magnet motor is rotated by a tool. In the electric tool that transmits to and rotates the power tool, the outer diameter of at least two protrusions of the plate is set larger than the outer diameter of the rotor core and smaller than the inner diameter of the stator ( For example, see Patent Document 1).

Further, the rotor assembly by fitting the bearing holder of the outer diameter d ₂ on the rear bearing fixing the magnet to the outer peripheral surface stuck disposed fixed outer diameter D ₃ rotor shaft, a rear portion of the stator inner diameter D A rear bracket having an inner circumferential surface having an inclined guide surface having a length l ₁ and a cylindrical guide surface having an inner diameter D ₂ from an end portion having an inner diameter D ₁ is disposed, and D> D ₂ ≧ d ₂ ≧ D _3. Under this relationship, insert the rotor into the stator while guiding the rotor front end with the inclined surface of the rear bracket and centering the rotor, and then insert the front end of the shaft into the front bearing fixed to the front bracket. In addition, there is one in which the rotor assembly is inserted into the stator by sliding the bearing holder of the rear bearing on the inner peripheral surface of the rear bracket as a guide member (see, for example, Patent Document 2).

JP 2006-289571 A (page 3, FIG. 1) JP-A-63-202251 (page 2, lower left column to lower right column, FIG. 2)

  However, according to the technique described in Patent Document 1, after the rotor is inserted into the stator, the plate disposed on the rotor cannot be removed, so the inertia of the rotor increases by the amount of the plate. Therefore, there is a problem that the output corresponding to the inertia is consumed.

  Further, according to the technique described in Patent Document 2, if the rigidity of the bearing is small, the rotor tilts around the bearing as a fulcrum due to the attractive force of the magnet of the rotor assembly, and is attracted to and interferes with the stator. There was a problem that the assemblability deteriorated. Furthermore, in order to insert the rotor and the stator without interfering with each other, there has been a problem that the axial length of the rear bracket needs to be larger than the axial length of the rotor core.

  The present invention has been made in view of the above, and can insert the rotor and the stator without causing interference, and after inserting the rotor into the stator, the inertia for the guide member is reduced. The object is to obtain a rotating electrical machine.

  In order to solve the above-described problems and achieve the object, the present invention provides a cylindrical frame, a stator held in the frame, and an outer peripheral portion attached to an end of the frame. A bracket for holding a bearing, a shaft supported by the bearing, and a rotor core supported by the shaft, the rotor core being disposed in the stator, and a screw hole; When the rotor is inserted into the stator, an outer peripheral portion is attached to the rotor core so as to protrude radially from the outer peripheral portion of the rotor core. And a guide member that is inserted into the screw hole and pulled out of the rotor core by being pulled into the screw hole.

  According to the present invention, the rotor and the stator can be inserted without interfering with each other, and after inserting the rotor and the stator, the inertia of the guide member can be reduced.

FIG. 1 is a cross-sectional view showing a first embodiment of a rotating electrical machine according to the present invention. FIG. 2 is a cross-sectional view showing a state during the assembly of the rotating electrical machine of the first embodiment. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a cross-sectional view showing a state during the assembly of another example of the rotating electrical machine of the first embodiment. FIG. 5 is a sectional view showing a second embodiment of the rotating electrical machine according to the present invention. FIG. 6 is a cross-sectional view showing a state during the assembly of the rotating electrical machine of the second embodiment. FIG. 7: is sectional drawing of the state in the middle of the assembly which shows Embodiment 3 of the rotary electric machine concerning this invention. 8 is a cross-sectional view taken along line AA in FIG.

  Embodiments of a rotating electrical machine according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a first embodiment of the rotating electrical machine according to the present invention, FIG. 2 is a cross-sectional view showing a state during the assembly of the rotating electric machine according to the first embodiment, and FIG. 2 is a sectional view taken along line BB in FIG. FIG. 4 is a cross-sectional view showing a state during the assembly of another example of the rotating electrical machine of the first embodiment.

  As shown in FIGS. 1 to 3, the rotating electrical machine 10 according to the first embodiment has a cylindrical frame 41, a stator 30 held in the frame 41, and outer peripheral portions attached to both ends of the frame 41. It comprises a disc-shaped bracket 42 that holds the outer ring 43a of the bearing 43 at the inner periphery, a shaft 22 supported by the inner ring of the bearing 43, and a rotor core 21 supported by the shaft 22, and the rotor core 21 is a stator. The rotor 20 disposed in the rotor 30 is attached to the rotor core 21 when the rotor 20 is inserted into the stator 30, and the outer peripheral portion projects radially from the outer peripheral portion of the rotor core 21. An end plate 44 serving as a guide member that guides insertion of the rotor 20 so that the outer peripheral portion of the core 21 does not interfere (contact) the stator 30 and is removed from the rotor core 21 after insertion. Yes.

  The end plate 44 is formed in an annular shape having an outer diameter larger than the outer diameter of the rotor core 21 and an inner diameter smaller than the outer diameter of the outer ring 43 a of the bearing 43, and after being removed from the rotor core 21, The inner surface of the bracket 42 is screwed with a bearing fixing screw 45 so as to contact the inner surface of 43a.

  The outer diameter of the end plate 44 is larger than the outer diameter of the rotor core 21 and smaller than the inner diameter of the stator 30. The inner diameter of the end plate 44 is smaller than the outer diameter of the outer ring 43 a of the bearing 43 fitted to the shaft 22, larger than the inner diameter of the outer ring 43 a, and is dimensioned to fit into the stepped portion 21 a of the rotor core 21. .

  The annular end plate 44 is provided with a plurality of screw holes 44a into which the bearing fixing screws 45 are screwed, and the bracket 42 is provided with a plurality of screw through holes 42a through which the bearing fixing screws 45 are inserted. The plurality of screw holes 42a are provided corresponding to the plurality of screw holes 44a.

  As shown in FIGS. 2 and 3, at the time of assembling the rotating electrical machine 10, the end plate 44 is fitted to the stepped portion 21 a of the rotor core 21, and the head from the diameter of the screw through hole 42 a provided in the bracket 42. It is fixed to the end surface of the rotor core 21 by one or more end plate mounting screws 46 having a small diameter.

  When the rotary electric machine 10 is assembled, the rotor 20 and the bearing 43, to which the end plate 44 is fixed by the end plate mounting screw 46, are integrally inserted into the stator 30, and the end plate 44 serves as an insertion guide to be fixed. The rotor 20 can be inserted without the rotor core 21 hitting the rotor 30.

  Next, as shown in FIG. 2, after inserting the rotor 20 into the stator 30, the end plate mounting screw 46 is removed from the end plate 44 fixed to the end face of the rotor core 21 through the screw through hole 42a. . Next, an end plate extraction screw 47 longer than the bearing fixing screw 45 is inserted into the screw through hole 42 a, and the end plate extraction screw 47 is screwed into the screw hole 44 a of the end plate 44.

  By pulling the end plate extraction screw 47, the end plate 44 is pulled out from the stepped portion 21 a of the rotor core 21 and brought into contact with the inner surface of the outer ring 43 a of the bracket 42 and the bearing 43. The bearing fixing screw 45 is inserted into the screw through hole 42a of the bracket 42 where the end plate pull-out screw 47 is not inserted, and is screwed into the screw hole 44a of the end plate 44 to fix the end plate 44 to the bracket 42 and the outer ring 43a of the bearing 43. To do. Next, the end plate pull-out screw 47 is removed, and a bearing fixing screw 45 is inserted and screwed in instead. Since the end plate 44 is removed from the rotor core 21 and fixed to the bracket 42, the inertia of the rotor 2 can be reduced.

  Further, since the end plate 44 is attached to the end face of the rotor core 21, it is only necessary to provide a gap corresponding to the thickness of the end plate 44 between the rotor core 21 and the bearing 43, thereby shortening the overall length of the rotating electrical machine 10. be able to. The end plate 44 may be attached to the end face of the rotor core 21 by a connecting member such as a pin instead of the end plate attaching screw 46.

  As shown in FIG. 4, when assembling the rotating electrical machine 10, the end plate 44 may be attached only to the end surface of the rotor core 21 on the insertion side to the stator 30. Even in this case, the rotor core 21 can be inserted into the stator 30 without interference.

Embodiment 2. FIG.
FIG. 5 is a sectional view showing a second embodiment of the rotating electrical machine according to the present invention, and FIG. 6 is a sectional view showing a state during the assembly of the rotating electrical machine according to the second embodiment. As shown in FIGS. 5 and 6, in the rotating electrical machine 12 of the second embodiment, a bearing housing 50 is used as a guide member instead of the end plate 44 of the first embodiment.

  The bearing housing 50 has an outer diameter larger than the outer diameter of the rotor core 21, an inner diameter that is the same as the outer diameter of the outer ring 43 a of the bearing 43, and an inner diameter that is smaller than the outer diameter of the outer ring 43 a and larger than the inner diameter of the outer ring 43 a. It has a large inner flange 50a and is formed in a cylindrical shape as a whole. After being removed from the rotor core 21, the bearing housing 50 is screwed to the bracket 42 with a bearing fixing screw 45 so as to hold the outer ring 43 a of the bearing 43.

  That is, in the rotating electrical machine 12 of the second embodiment, the insertion of the rotor core 21 is guided and the bearing 43 is fixed to the bracket 42 using the cylindrical bearing housing 50 having the inner flange 50a. . When the bearing housing 50 is used, the depth of the screw hole 50b can be increased, the distance between the bearing 43 and the rotor core 21 can be shortened, and the overall length of the rotating electrical machine 12 can be shortened.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view showing a third embodiment of the rotating electrical machine according to the present invention in the middle of assembly, and FIG. 8 is a cross-sectional view taken along the line AA in FIG. In the rotating electrical machine 13 of the third embodiment, instead of the annular end plate 44 of the first embodiment, two circular arcs obtained by dividing an annular plate whose outer diameter is larger than the outer diameter of the rotor core 21 into two parts. The end plate 60 is used. Two arc-shaped end plates 60 are attached to the rotor core 21 to serve as insertion guides for the rotor core 21.

  After the rotor 2 is guided by the two arcuate end plates 60 and inserted into the stator 30, the end plate 60 can be removed from the rotor core 21. Even when the end plate 60 is not used for retaining the bearing 43 of the rotating electrical machine 13, the rotor core 21 can be inserted into the stator 30 without interfering with the end plate 60. If removed, the inertia of the rotor 20 and the weight of the rotating electrical machine 13 can be reduced.

  As described above, the rotary electric machine according to the present invention has a small rotor inertia and is useful as a control rotary electric machine.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 20 Rotor, 21 Rotor core, 21a Step part, 22 Shaft, 30 Stator, 41 Frame, 42 Bracket, 42a Screw through hole, 43 Bearing, 43a Outer ring, 44 End plate (guide member), 44a Screw hole, 45 Bearing fixing screw, 46 End plate mounting screw, 47 End plate extraction screw, 50 Bearing housing, 50a Inner flange, 50b Screw hole, 60 Arc-shaped end plate.

Claims (3)

A cylindrical frame,
A stator held in the frame;
A bracket for attaching an outer peripheral portion to an end of the frame and holding a bearing at the inner peripheral portion;
A rotor supported by the bearing and a rotor core supported by the shaft, the rotor core being disposed in the stator;
A screw hole, and when the rotor is inserted into the stator, an outer peripheral portion is attached to the rotor core so as to protrude radially from the outer peripheral portion of the rotor core; A guide member inserted from a screw hole of the bracket is screwed into the screw hole and pulled out of the rotor core to be removed from the rotor core,
A rotating electric machine comprising:   The guide member is formed in an annular shape having an outer diameter larger than the outer diameter of the rotor core and an inner diameter smaller than the outer diameter of the bearing, and after being removed from the rotor core, the inner surface of the outer ring of the bearing The rotating electrical machine according to claim 1, wherein the rotating electrical machine is screwed to an inner surface of the bracket so as to be in contact with the bracket.   The guide member is a bearing housing having an inner flange whose outer diameter is larger than the outer diameter of the rotor core, whose inner diameter is the same as the outer diameter of the outer ring of the bearing, and whose inner diameter is smaller than the outer diameter of the outer ring. 2. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is formed in a cylindrical shape and is screwed to the bracket so as to hold an outer ring of the bearing after being removed from the rotor core.

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