JPH0550953U - Fasteners for fixing stators in electric motors or generators - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to obtain a fastener for fixing a stator in an electric motor or a generator, which can fix the stator in a stable state and improve the assembling property. is there. [Composition] A pair of magnets 16 and 18 are closely arranged with a gap 38 on the inner peripheral surface of the housing 12,
The fixed spring 20, which is substantially E-shaped and line-symmetrical, is inserted and disposed in this gap 38 in a state of being elastically deformed. In the state after the insertion and arrangement, the bent portions 20A to 20A of the fixed spring 20 are arranged on both sides (in this case, at equal distance positions) across the circumferential line X-X passing through the intermediate positions of the magnets 16 and 18.
20D abuts. Therefore, the stable magnet 16,
The fixed state of 18 can be obtained, and the assembling property thereof can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing tool for fixing a stator, which fixes a plurality of stators arranged on an inner peripheral surface of a substantially cylindrical housing at predetermined positions.

[0002]

[Prior Art]

 Generally, an electric motor or generator includes a substantially cylindrical housing, a rotor axially supported by the shaft core of the housing, a plurality of stators arranged on the inner peripheral surface of the housing at predetermined intervals, and the like. Is equipped with. Hereinafter, a motor will be described as an example.

The motor includes a substantially cylindrical housing whose one axial end face is closed, and the other axial end face (opening-side end face) is closed by a disc-shaped end member. ing. Functional components such as a rotor and a pair of stators are arranged in this housing. Of these, many of the stators (magnets) have an arc shape curved along the inner peripheral surface of the housing, and both end surfaces in the circumferential direction of each stator are arranged at a predetermined distance from each other. ing.

As a method of fixing the above-mentioned stator to the inner peripheral surface of the housing, it has been generally known in the past to use an adhesive or a spring. However, the method of fixing the stator to the inner peripheral surface of the housing using an adhesive is weak against shock and heat, and it is difficult to apply the adhesive evenly to the inner peripheral surface of the housing, so that the axis line of the motor cannot be fixed. There is a problem such as a large change in the standard diameter. For this reason, a method of fixing the stator with a spring is adopted depending on the environment in which the motor is installed (for example, see Japanese Utility Model Laid-Open No. 3-3153).

In the structure disclosed in this publication, as shown in FIG. 7, the magnets 100 and 102, which are a pair of stators, have a height substantially equal to the height of the magnets 100 and 102 between the end surfaces in the circumferential direction. A U-shaped wire spring 104 is inserted and arranged. That is, after the both ends 104A and 104B on the opening side of the wire spring 104 are elastically deformed in a direction in which they approach each other, they are inserted and arranged between both end faces of the magnets 100 and 102, and then the pressing force is released to release the opening side. Both end portions 104A and 104B press the circumferential end surfaces of the pair of magnets 100 and 102, thereby fixing the magnets 100 and 102 to the inner circumferential surface of the housing.

[0006]

[Problems to be solved by the device]

 However, in this structure, since the wire spring 104 is U-shaped, the elastic force of the wire spring 104 inevitably has one end in the height direction of both end faces of the magnets 100 and 102 as a pressing point. To work. Therefore, the pressing points are not equidistant from the Y-Y line which is the circumferential line of the magnets 100 and 102 passing through the middle points of the magnets 100 and 102 in the height direction, that is, they are asymmetric. Therefore, the pressure distribution along the height direction of the magnets 100 and 102 becomes non-uniform with respect to the Y-Y line, and the stable fixing state of the magnets 100 and 102 to the housing cannot be obtained. .. It should be noted that this problem tends to be promoted as the height of the magnets 100 and 102 increases, because the ends of the wire spring 104 that are not pressed by the ends 104A and 104B are more likely to shift.

Further, when the U-shaped wire spring 104 that applies pressure at one point is used, a wire spring having a relatively large diameter must be used in order to obtain a sufficient pressing force to the magnets 100 and 102. Therefore, when the wire spring 104 is assembled, the pressing force for elastically deforming the wire spring 104 increases and the amount of elastic deformation also increases. Furthermore, if a U-shaped wire spring 104, one of which has an open end, is used, the wire spring 104 must be inserted in a unique insertion direction from the viewpoint of stabilizing the magnets 100 and 102 in a fixed state. I have to. Therefore, from the above, when the U-shaped wire spring 104 is used, there arises a problem that the assembling property is deteriorated.

In consideration of the above facts, the present invention provides a fastener for fixing a stator in an electric motor or a generator, which can fix the stator in a stable state and can improve the assembling property. The purpose is to obtain.

[0009]

[Means for Solving the Problems]

 INDUSTRIAL APPLICABILITY The present invention is applied to an electric motor or a generator having a substantially cylindrical housing and a plurality of stators arranged on the inner peripheral surface of the housing at a predetermined interval from each other. A fastener for fixing a stator fixed at a position, which is elastically deformed and inserted into a gap between mutually facing end faces of stators adjacent to each other in a circumferential direction, and is disposed in the housing of the adjacent stators. Abutting the end faces of at least one of the adjacent stators on both sides straddling the circumferential line passing through the intermediate position along the axial direction, and pressing the opposing end faces in a direction away from each other. It has a feature.

[0010]

[Action]

 According to the present invention having the above structure, the plurality of stators are arranged at a predetermined interval on the inner peripheral surface of the housing. To fix this stator with the fixing fasteners, first elastically deform the fixing fasteners, and then insert the fixing fasteners into the gap between the end faces of the stators adjacent to each other in the circumferential direction in this state. And place it. As a result, the end surfaces of the plurality of stators that face each other are pressed in the directions in which they are separated from each other by the elastic force of the fixing fastener, and are fixed to the inner peripheral surface of the housing.

Here, in a state where the stator is fixed by the fixing fastener, the fixing fasteners are provided on both sides of a circumferential line passing through an intermediate position along an axial direction of the housing in the adjacent stators. The end surface of at least one of the adjacent stators is abutted. For this reason, the pressing positions of the plurality of stators by the fixing fasteners are on both sides with respect to the circumferential line, and compared to the conventional structure in which only one side with respect to the circumferential line is provided, Fixed state is stable.

In addition, unlike the conventional structure in which pressure is applied at one point on one side, fixing fasteners contact the end faces of the stator on both sides across the circumferential line, and the opposite end faces are separated from each other. Since the pressure is applied, the wire diameter can be reduced when, for example, a wire spring is used as the fixing fastener. Therefore, it is possible to reduce the pressing force and the elastic deformation amount when elastically deforming the fixing fastener. Furthermore, since the fixing fastener contacts the end surface of the stator on both sides of the circumferential line, the inserting direction of the fixing fastener when assembled is not uniquely restricted. Therefore, from the above, when the fixing fastener according to the present invention is used, its assembling property is improved.

[0013]

【Example】

 Hereinafter, a motor 10 as an electric motor according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a schematic configuration of a motor 10. The motor 10 includes a housing 12, in which an armature 14, a pair of magnets 16 and 18 as a stator, and a fixing member are provided. A fixed spring 20 as a fastener is housed and arranged at a predetermined position.

The housing 12 includes a substantially cylindrical peripheral wall 12A and a bottom wall 12B that closes one end surface of the peripheral wall 12A in the axial direction. It should be noted that the housing 12 in FIG. 1 is shown with a part thereof cut away along the axis thereof. The other end surface of the housing 12 in the axial direction is opened, and is closed by a substantially disk-shaped end housing (not shown) after a predetermined assembling work is completed. Further, a bulged portion 22 having a cylindrical shape with an end and coaxially bulging is formed on the shaft core portion of the bottom wall 12B of the housing 12.

An armature 14 (illustrated by a chain double-dashed line) is arranged at the axis of the housing 12. The axial end of the shaft 24 of the armature 14 serves as an output shaft 24A, and a commutator 26 is fixed in front of the output shaft 24A. Further, the shaft 24 is axially supported by the housing 12 via a bearing 28 between the axially rear end portion thereof and the commutator 26 and the output shaft 24A. In addition, in FIG. 1, a bearing 28 is illustrated on the armature 14 side in order to show the shaft support position of the shaft 24.

A pair of projecting stoppers 30 and 32 (see FIGS. 1 and 2) are provided on the inner peripheral surface of the housing 12 on the side of the bulging portion 22. The movement of 18 in the circumferential direction is restricted. Further, a stepped portion 34 is formed on the inner peripheral surface of the housing 12 on the side of the bulging portion 22 with respect to the position where the stoppers 30 and 32 are arranged. It regulates movement along the direction.

A pair of magnets 16 and 18 are arranged around the armature 14 on the inner peripheral surface of the housing 12. Each of the magnets 16 and 18 has a shape in which a rectangular flat plate is curved along the inner peripheral surface of the housing 12. The end faces 16A and 18A of the magnets 16 and 18 that face each other in the circumferential direction abut the stoppers 30 and 32, and the end faces 16C and 18C (see FIG. 3) in the direction along the axial direction of the housing 12 are the same. It is in contact with the step portion 34. As a result of this positioning, as shown in FIG. 2, the circumferential end faces 16A, 16B of one magnet 16 and the circumferential end faces 18A, 18B of the other magnet 18 are separated by the gaps 36, 38 having the gap size S. They are placed facing each other with the open.

The fixed spring 20 is inserted and arranged in one of the pair of gaps 36 and 38 that are opposed to each other in the radial direction. As shown in FIGS. 1 and 3, the fixed spring 20 has both axial end portions curved in the same direction and an arc shape with a predetermined radius of curvature, and the axial intermediate portion has both axial end portions. It has a substantially E-shape that is curved in a circular arc shape with a predetermined radius of curvature in a direction approaching. In other words, the fixed spring 20 is line-symmetrical with respect to the normal line HH (see FIG. 3) passing through the intermediate point in the axial direction and on the plane including the fixed spring 20.

Therefore, when the fixed spring 20 is set in the gap 38, the circumferential line XX passing through the midpoint of the pair of magnets 16 and 18 in the height direction (direction along the axial direction of the housing 12). And the normal line HH of the fixed spring 20 coincide with each other. Therefore, the bent portions 20A, 20C and the bent portions 20B, 20D of the fixed spring 20 are located at positions equidistant from the circumferential line XX, and at this position, the circumferences of the magnets 16, 18 are surrounded. One of the end faces 16B and 18B in the direction is abutted, respectively, and these are pressed and biased in the direction away from each other (direction of arrow G in FIG. 3).

The operation of this embodiment will be described below through the procedure of assembling the fixed spring 20.

First, the pair of magnets 16 and 18 are inserted so that the inner peripheral surface of the housing 12 is in a predetermined position (the end surfaces 16A and 18A are in contact with the stoppers 30 and 32, and the end surfaces 16C and 18C are attached to the step portion 34). Are in contact with each other). As a result, gaps 36 and 38 having a gap size S are formed between the circumferential end faces 16A and 16B of the magnet 16 and the circumferential end faces 18A and 18B of the magnet 18, respectively.

Next, the fixed spring 20 is elastically deformed from its natural state (the state shown on the left side in FIG. 3) by slightly compressing it along the circumferential direction of the magnets 16, 18. Then, in this state, the fixed spring 20 is inserted into the gap 38 along the direction of the arrow L in FIG. 3, and is arranged so that the normal line H-H coincides with the circumferential line X-X. In the state after the fixed spring 20 has been inserted and arranged, the bending portion 20A and the bending portion 20C are equidistant from the circumferential line XX on one circumferential end face 18B of the magnet 18. Abutting. Similarly, the bent portion 20B and the bent portion 20D are in contact with each other on one circumferential end face 16B of the magnet 16 at positions equidistant from the circumferential line XX. Therefore, the magnets 16 and 18 are fixed to the magnets 16 and 18 in the same circumferential direction lines (the circumferential line passing through the bent portions 20A and 20B and the circumferential line passing through the bent portions 20C and 20D) and away from each other. An elastic force of 20 is applied, so that the magnets 16 and 18 are fixed to the inner peripheral surface of the housing 12. Therefore, in the state after being fixed, the pressure distribution acting on the magnets 16 and 18 becomes uniform in each. Further, the pressure distributions acting on the magnets 16 and 18 are substantially the same as each other.

As described above, in this embodiment, the substantially E-shaped fixing is made at a position equidistant from the circumferential line XX of the housing 12 passing through the midpoints of the magnets 16 and 18 in the height direction. Since the magnets 16 and 18 are fixed to the inner peripheral surface of the housing 12 by pressing one end faces 16B and 18B of the magnets 16 and 18 in the circumferential direction by the spring 20, the magnets 16 and 18 are fixed to the inner peripheral surface of the housing 12. The applied pressure distribution can be made uniform. Therefore, a stable fixed state of the magnets 16 and 18 can be obtained. Further, in this embodiment, the pressure points acting on the magnets 16 and 18 are located on both sides of the circumferential line XX (bent portions 20A and 20C or bent portions 20B and 20D). It is possible to stabilize the fixed state of 18.

Further, since the pressure points acting on the magnets 16 and 18 are on both sides with respect to the circumferential line XX, the U-shaped linear spring 104 of the one-point pressure type (conventional type) that applies pressure only on one side is used. It is possible to make the wire diameter of the fixed spring 20 smaller than that of the structure). That is, the fixed spring 20 can be made thin. For this reason, the pressing force for elastically deforming the fixed spring 20 when the fixed spring 20 is assembled and the elastic deformation amount of the fixed spring 20 can be reduced. Therefore, the assemblability of the fixed spring 20 into the gap 38 of the housing 12 can be improved.

Further, since the fixed spring 20 is symmetrical with respect to the normal line H-H, when the fixed spring 20 is inserted into the gap 38, the fixed spring 20 has no directivity and is fixed. It may be inserted from either end. Also from this point, the assembling property of the fixed spring 20 in the gap 38 of the housing 12 can be improved.

Further, in the conventional U-shaped wire spring 104, both end portions 104 A and 104 B on the opening side of the wire spring 104 slide on one end surface of the magnets 100 and 102 in the circumferential direction when assembled. , The end faces 16B and 18B of the magnets 16 and 18 may be damaged, and the damage may cause shavings, which may adversely affect the operation noise of the motor 10 and the operation of the motor 10 itself. According to the fixed spring 20 of the example, even when the fixed spring 20 and the end surfaces 16B and 18B of the magnets 16 and 18 slide, the arc-shaped bent portions 20A to 20D only slide, so that the magnet 16 One of the end faces 16B, 18B in the circumferential direction of No. 18, 18 is not damaged, and no shavings are generated. Therefore, the operating noise of the motor 10 due to the shavings and the operation itself of the motor 10 are not adversely affected.

In the present embodiment, the substantially E-shaped fixed spring 20 shown in FIG. 3 is used to attach the end faces 16B, 18B of the magnets 16, 18 at positions equidistant from the circumferential line XX. However, the present invention is not limited to this, but the state where the magnets 16 and 18 are inserted and arranged in the gap 38 between the magnets 16 and 18 is such that at least one of the magnets 16 is provided on both sides across the circumferential line XX of the magnets 16 and 18. Any spring can be applied as long as it is in contact with the end surface 16B of the magnet 18 or the end surface B of the magnet 18. Therefore, for example, as shown in FIG. 4, when a motor using magnets 50 and 52 whose height dimension is higher in the axial direction of the housing 12 than the magnets 16 and 18 described above is applied, It is also possible to use a fixed spring 54 that is lengthened accordingly.

Further, instead of the fixed spring 20, a substantially C-shaped fixed spring 56 as shown in FIG. 5 may be used. In this case, the pressing points of the fixed spring 56 on the magnets 16 and 18 are one point and two points, but on both sides straddling the circumferential line XX (in this case, with respect to the circumferential line XX, etc.). Since it abuts the end face 18B in the circumferential direction at a position (distance), the fixed state of the magnet 18 can be stabilized. Since the magnet 16 is also in contact with the end surface 16B on the circumferential line XX, the fixed state of the magnet 16 is also stable.

Further, instead of the fixed spring 20, an S-shaped fixed spring 58 as shown in FIG. 6 may be used. In this case, although it is not a line-symmetry with respect to the normal line H-H, it has point symmetry, and like the fixed spring 20 shown in FIG. 3, the magnets are provided on both sides across the circumferential line X-X. Since the end faces 16B and 18B of the blades 16 and 18 are in contact with each other, the advantages of the pressurizing point, the pressurizing distribution, and the directionality of the inserting direction during assembly are the same as those of the fixed spring 20.

Further, in the present embodiment and the various modified examples, wire springs are used as the fixed springs 20, 54, 56, 58, but thin and narrow leaf springs may be used.

Although the present invention is applied to the motor 10 in the present embodiment, the present invention is not limited to this, and the present invention may be applied to a generator.

[0033]

[Effect of the device]

 As described above, the fastener for fixing the stator in the electric motor or generator according to the present invention can fix the stator in a stable state and can improve the assembling property of the stator. Has excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a motor according to an embodiment of the present invention, centering around a fixed spring.

FIG. 2 FIG. 1 with a fixed spring inserted and arranged.
2 is a sectional view taken along line 2-2 of FIG.

3 is a side view seen from the R direction in FIG. 2 showing a state before the fixed spring of FIG. 1 is inserted into a gap between magnets and a state after the fixed spring is inserted.

FIG. 4 is a side view corresponding to FIG. 3, showing a modification of the fixed spring of FIG.

FIG. 5 is a side view corresponding to FIGS. 3 and 4 showing a modified example of the fixed spring of FIG.

FIG. 6 is a side view corresponding to FIGS. 3 to 5, showing a modification of the fixed spring of FIG. 1.

FIG. 7 is a side view corresponding to FIG. 3 showing a U-shaped fixed spring according to a conventional example.

[Explanation of symbols]

 10 motor (electric motor) 12 housing 16 magnet (stator) 18 magnet (stator) 20 fixed spring (fastener for fixing) 38 gap 50 magnet (stator) 52 magnet (stator) 54 fixed spring (fastener for fixing) ) 56 fixed spring (fastening fastener) 58 fixed spring (fastening fastener)

Claims (1)

[Scope of utility model registration request] 1. A motor having a substantially cylindrical housing, and a plurality of stators arranged on the inner peripheral surface of the housing at a predetermined interval from each other. A fastener for fixing a stator to be fixed in a position, which is inserted and arranged in a gap between end faces facing each other in circumferentially adjacent stators in a state of being elastically deformed, the housing of the adjacent stator being On both sides straddling a circumferential line passing through an intermediate position along the axial direction, the end faces of at least one of the adjacent stators are abutted, and the opposing end faces are pressed in directions away from each other. A fastener for fixing the stator in the electric motor or generator.