JP2004208402A - Stator of rotating electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotating electric motor capable of easily preventing the curling up or disjointing of a plurality of electromagnetic steel plates laminated to constitute a stator core. <P>SOLUTION: The stator of the rotating electric motor comprises holding pieces 31 and 32 that hold one end face and the other end face and make an outer frame member 13 abut with outer peripheral parts of end faces 11B and 11C of a teeth core 11 in the lamination direction of an electromagnetic steel plate 11a, and abut with outer peripheral parts of end faces 12B and 12C of a core back core 12 in the lamination direction of an electromagnetic steel plate 12a. It also comprises a plurality of connection pieces 33 to 33 that connect the end face holding pieces 31 and 32 to each other. A plurality of rod-like connection pieces 33 to 33 extending in the direction of a central axis line O are connected at circumferential positions at prescribed intervals, on the outer peripheral part of the facing surfaces, of the annular end face holding pieces 31 and 32. Each connection piece 33 is engaged with a recess 23 of the teeth core 11. Outer peripheral surfaces of the teeth core 11, the core back core 12, the end face holding pieces 31 and 32, and the connection piece 33 have similar outside diameters. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stator for an electric motor.
[0002]
[Prior art]
Conventionally, for example, a stator core is divided into a tooth core portion and a core back core portion, and a stator winding is wound around a slot portion between the tooth core portions, and then a core back core portion is inserted between the tooth core portions. 2. Description of the Related Art There is known a stator that is pressed and inserted from the outside in the radial direction (for example, see Patent Document 1).
In this stator, in order to reduce eddy current loss, the teeth core portion and the core back core portion are configured by laminating a plurality of electromagnetic steel plates in the rotation axis direction of the stator.
[0003]
[Patent Document 1]
JP-A-4-236149
[Problems to be solved by the invention]
By the way, in the stator according to an example of the above-described conventional technology, for example, when the stator is mounted on an appropriate device, the stator is pressed into the holder covering the outer peripheral surface of the stator along the lamination direction of the electromagnetic steel sheets. In some cases, it is desired to prevent a plurality of laminated electromagnetic steel sheets from being rolled up or separated.
The present invention has been made in view of the above circumstances, and a stator of an electric motor capable of easily preventing a plurality of laminated electromagnetic steel sheets constituting a stator core from being rolled up or separated. The purpose is to provide.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the above object, a stator for an electric motor according to the first aspect of the present invention includes a plurality of teeth cores arranged on a predetermined circumference (for example, in an embodiment described later). A stator winding (for example, a wire C in an embodiment to be described later) inserted between the adjacent tooth cores from the outer periphery side, and the stator winding between the adjacent tooth cores. And a core back core (e.g., a core back core 12 in an embodiment to be described later) provided on the outer peripheral side of the stator. The stator core including the teeth core and the core back core has a plurality of stator cores. (For example, the electromagnetic steel sheets 11a and 12a in the embodiments described later) are laminated, and one and the other end faces of the stator core in the laminating direction of the electromagnetic steel sheets (for example, described later). One and other end face holding pieces (for example, one and other end face holding pieces in an embodiment to be described later) that contact the outer peripheral portions of the one and other end faces 11B and 11C and the end faces 12B and 12C in the embodiment. Pieces 31 and 32) and a connecting piece (for example, a connecting piece 33 in an embodiment to be described later) connected to the one and the other end face holding pieces and fixed by an outer peripheral portion of the stator core. It is characterized by including a frame member (for example, an outer frame member 13 in an embodiment described later).
[0006]
According to the stator of the electric motor having the above configuration, the outer frame member is arranged such that each end face of the stator core in the lamination direction of the electromagnetic steel sheets is sandwiched from both sides with respect to the stator core formed by laminating a plurality of electromagnetic steel sheets. Since it is provided, for example, even when an external force acts in the laminating direction of the electromagnetic steel sheets, the laminated electromagnetic steel sheets can be reliably prevented from being turned up or dislodged. .
[0007]
Further, the stator for the electric motor according to the second aspect of the present invention is configured such that a plurality of tooth cores (for example, a tooth core 11 in an embodiment described later) arranged on a predetermined circumference and a space between the adjacent tooth cores are provided. (For example, a wire C in an embodiment to be described later) inserted from the outer peripheral side of the stator core, and a core back core (for example, a wire core) provided on the outer peripheral side of the stator winding between the adjacent tooth cores. , A stator core comprising the teeth core and the core back core is provided with a plurality of electromagnetic steel plates (for example, in the embodiments described later). The electromagnetic steel sheets 11a, 12a) are laminated, and a groove (for example, a concave portion 23 in an embodiment described later) extending along the lamination direction of the electromagnetic steel sheets is formed on the outer peripheral surface of the tooth core. One end and the other end face of the stator core in the laminating direction of the electromagnetic steel sheets (for example, one and the other end faces 11B and 11C and the end faces 12B and 12C in the embodiment described later) are in contact with the outer peripheral portion. One and the other end face holding pieces (for example, one and the other end face holding pieces 31 and 32 in an embodiment described later) and a connecting piece for connecting the one and the other end face holding pieces (for example, an embodiment to be described later) An outer frame member (for example, an outer frame member 13 in an embodiment to be described later) formed of a connection piece 33) in a form and having a substantially U-shape when viewed from the circumferential direction of the stator core. And the connecting piece is engaged with the groove.
[0008]
According to the stator of the electric motor having the above configuration, the outer frame member is arranged such that each end face of the stator core in the lamination direction of the electromagnetic steel sheets is sandwiched from both sides with respect to the stator core formed by laminating a plurality of electromagnetic steel sheets. Since it is provided, for example, even when an external force acts in the laminating direction of the electromagnetic steel sheets, the laminated electromagnetic steel sheets can be reliably prevented from being turned up or dislodged. .
Moreover, since the connecting piece of the outer frame member is engaged with the groove of the tooth core, it is possible to prevent the outer frame member from protruding radially outward from the outer peripheral surface of the tooth core, for example. By providing the frame member, it is possible to prevent the outer diameter of the stator from increasing.
[0009]
Furthermore, in the stator for the electric motor according to the third aspect of the present invention, the connecting piece of the outer frame member is capable of being split and connected at an intermediate position in the laminating direction of the electromagnetic steel sheets (for example, an embodiment described below). It is characterized by having a coupling convex portion 33-1a and a coupling concave portion 33-2b) in the form.
[0010]
According to the stator of the electric motor having the above configuration, the outer frame member can be easily mounted on the stator core including the tooth core and the core back core.
[0011]
Furthermore, in the stator for the electric motor according to the fourth aspect of the present invention, the end face holding piece of the outer frame member is provided with a connecting part (for example, an embodiment described later) that can be divided and connected in the circumferential direction of the stator core. , And a coupling concave portion 31- (k + 1) b).
[0012]
According to the stator of the electric motor having the above configuration, the outer frame member can be easily mounted on the stator core including the tooth core and the core back core.
[0013]
Furthermore, in the stator for the electric motor according to the fifth aspect of the present invention, the end surface suppressing piece of the outer frame member abuts on the end surface of the tooth core and protrudes radially inward (for example, as described later). The present invention is characterized in that each holding piece projection 41, 42) in the embodiment is provided.
[0014]
According to the stator of the electric motor having the above configuration, for example, the stator winding is set around the protruding portion together with the tooth core, and an insulating coating formed by applying an insulating paint on the surface of the protruding portion is provided. By applying a heat dissipating material on the surface of the insulating film, the heat dissipating property of the stator, particularly, the heat dissipating property for heat generated by the stator windings can be improved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a motor stator according to the present invention will be described with reference to the accompanying drawings.
The stator 10 of the electric motor according to the present embodiment is formed in a substantially cylindrical shape as shown in FIGS. 1 to 3, for example, and includes a plurality of tooth cores 11, which are arranged at predetermined intervals on a predetermined circumference. , 11, a core-back core 12,..., 12 disposed between adjacent tooth cores 11,..., And an outer frame member 13. For example, the outer diameter of an outer peripheral surface 10A of the stator 10 is provided. Is press-fitted into a holder 15 having an inner peripheral surface 15A having an inner diameter with a predetermined interference so that the outer peripheral surface 10A of the stator 10 is covered with the inner peripheral surface 15A of the holder 15 in a tightly fitted state. It has become.
[0016]
As shown in FIG. 4, for example, the tooth core 11 and the core back core 12 are formed by laminating a plurality of electromagnetic steel plates 11 a and 12 a such as a plurality of silicon steel plates having a predetermined width in a circumferential direction in a direction of a center axis O of the stator 10. It is formed in a substantially rectangular parallelepiped shape.
The tooth core 11 includes, for example, a wire passing portion 21 serving as an inner peripheral portion and a yoke portion 22 serving as an outer peripheral portion, and a wire C supplied from an appropriate winding machine (not shown) is provided. The teeth cores 11,..., 11 are wound so as to sew between the wire passing portions 21,.
[0017]
The core back core 12 is press-fitted from the outer peripheral side between the adjacent tooth cores 11, for example, in a state in which the wire is wound around the wire transition portion 21 of the tooth core 11, and the yoke part 22 of the adjacent tooth cores 11, 11. , 21 so as to be sandwiched from both sides.
Here, the yoke portion 22 of the tooth cores 11, 11 and the core back core 12 are formed such that the lengths in the radial direction of the stator 10 are equal, and between the adjacent tooth cores 11, 11. In a state where the core back iron core 12 is press-fitted, the outer peripheral surface 11A of the tooth core 11 (that is, the outer peripheral surface of the yoke portion 22) and the outer peripheral surface 12A of the core back iron core 12 are smoothly connected to each other, and have the same outer diameter. It is made to make a plane.
On the outer peripheral surface 11A of the tooth core 11, for example, as shown in FIG. 4, a concave portion 23 extending in the laminating direction of the electromagnetic steel sheets 11a, that is, in the direction of the center axis O of the stator 10 is provided.
[0018]
As shown in FIGS. 2 and 4 and FIGS. 5 (a) and 5 (b), the outer frame member 13 has an outer peripheral portion of one and the other end faces 11B and 11C of the tooth core 11 in the laminating direction of the electromagnetic steel sheets 11a. And the other end face holding pieces 31 and 32 that abut against the outer peripheral portions of the one and the other end faces 12B and 12C of the core back iron core 12 in the stacking direction of the magnetic steel sheet 12a and the one and the other end face holding pieces 31 and 32, respectively. , And 33, which are connected to each other.
For example, the one and the other end face holding pieces 31 and 32 are formed in a ring shape, and are arranged such that the center axis of each end face holding piece 31 and 32 is coaxial with the center axis O of the stator 10. On the outer peripheral portion of the opposing surfaces 31A, 32A of the end surface suppressing pieces 31, 32, a plurality of substantially rod-shaped connecting pieces 33,. 33 are connected to each other, and the opposing surfaces 31A, 32A of the end face suppressing pieces 31a, 31b are connected by these connecting pieces 33,.
[0019]
Here, the outer peripheral surfaces 31B and 32B of the end surface suppressing pieces 31 and 32 and the outer peripheral surface 33A of the connecting piece 33 are smoothly connected so as to form an outer peripheral surface having an equivalent outer diameter. Further, the connecting piece 33 is engaged with the concave portion 23 of the tooth core 11, and the outer peripheral surface 11 </ b> A of the tooth core 11 (that is, the outer peripheral surface of the yoke part 22) and the outer peripheral surface 33 </ b> A of the connecting piece 33 are smoothly connected, The outer peripheral surfaces have the same outer diameter.
That is, the opposing surfaces 31A and 32A of the end surface pressing pieces 31 and 32 are provided on one and the other end surfaces 11B and 11C of the tooth core 11 and on the one and the other end surfaces 12B and 12C of the core back core 12 respectively. The outer peripheral surface 11A of the tooth core 11 and the outer peripheral surface 12A of the core back iron core 12 and the respective end surfaces are brought into contact with each other in a state where the connecting pieces 33 that come into surface contact and connect the respective end face pressing pieces 31 and 32 are engaged with the concave portions 23 of the tooth core 11. The outer peripheral surfaces 31B, 32B of the holding pieces 31, 32 and the outer peripheral surface 33A of the connecting piece 33 form an outer peripheral surface having an equivalent outer diameter.
[0020]
In the radial direction of the stator 10, for example, the length of the connecting piece 33 is formed shorter than the length of each of the end face suppressing pieces 31 and 32. The connecting piece 33 is formed so as to protrude radially inward from the inner peripheral surface 33B of the connecting piece 33. For this reason, as shown in FIG. 5B, for example, the outer frame member 13 is formed in a substantially U-shape when viewed from the circumferential direction of the tooth core 11.
For example, as shown in FIG. 6, in the radial direction of the stator 10, the length of each end face holding piece 31, 32 is shorter than the length of the yoke portion 22 of the tooth cores 11, 11 and the core back iron core 12. Is formed.
[0021]
As described above, according to the stator 10 of the electric motor according to the present embodiment, each of the electromagnetic steel plates 11a, 12a is provided with respect to the tooth core 11 and the core back core 12 in which the plurality of magnetic steel plates 11a, 12a are laminated. Since the outer frame member 13 is provided so as to sandwich the end faces 11B and 11C and the end faces 12B and 12C from both sides in the stacking direction of the electromagnetic steel sheet 11a, for example, the electromagnetic steel sheet 11a is placed in the holder 15 that covers the outer peripheral face of the stator 10. Even when the stator 10 is press-fitted along the stacking direction of the electromagnetic steel plates 12a, 12a, it is possible to prevent the stacked electromagnetic steel plates 11a, 12a from being turned up or separated.
Moreover, since the connecting piece 33 of the outer frame member 13 is engaged with the concave portion 23 of the tooth core 11, the outer diameter of the stator core including the tooth core 11 and the core back core 12 and the outer frame The outer diameter of the stator 10 to which the member 13 is attached is set to be equal to the outer diameter of the stator 10, so that the outer diameter of the stator 10 can be prevented from increasing.
[0022]
In the above-described embodiment, the outer frame member 13 may be fixed to the tooth core 11 and the core back core 12 by, for example, caulking, or may be formed by, for example, molding.
[0023]
In the above-described embodiment, the outer frame member 13 may include an insulating layer formed by applying an insulating paint on the surface, or may be formed of an electrical insulator.
[0024]
In the present embodiment described above, the one and the other end face suppressing pieces 31 and 32 are formed in an annular plate shape, and the length of each end face suppressing piece 31 and 32 in the radial direction of the stator 10 is set to the teeth. Although formed to be shorter than the lengths of the yoke portion 22 and the core back core 12 of the iron core 11, the present invention is not limited to this. For example, the outer frame of the stator 10 of the electric motor according to the first modification of the present embodiment shown in FIG. Like the member 13, each of the annular plate-shaped end faces 31 and 32 comes into contact with one and the other end faces 11B and 11C of the tooth core 11 and projects inward in the radial direction. One-side protruding portions 41 and 42 may be provided.
In the stator 10 of the electric motor according to the first modification, the length of each of the retaining piece protrusions 41 and 42 in the radial direction of the stator 10 is such that the inner peripheral portion of each of the retaining piece protrusions 41 and 42 is the tooth core 11. The wire C is wound around the wire passing portion 21 and each of the holding piece protrusions 41 and 42.
Then, on the surface of the outer frame member 13, for example, an insulating coating formed by applying an insulating paint is provided, and on the surface of the insulating coating, a heat dissipation material is applied. Thereby, the heat radiation of the stator 10, particularly the heat radiation of the wire C, can be improved.
[0025]
In the above-described embodiment, for example, the outer frame member 13 of the stator 10 of the electric motor according to the second modification of the embodiment shown in FIG. 8 or the third modification of the embodiment shown in FIG. Like the outer frame member 13 of the stator 10 of the electric motor according to the example, a plurality of divided portions 31-1,... Formed by circumferentially dividing one and the other end face holding pieces 31, 32 of an annular plate shape. , 31-n and 32-1,..., 32-n (n is an arbitrary natural number).
In these second and third modifications, for example, in the adjacent divided portions 31-k, 31- (k + 1); (where 1 ≦ k ≦ n−1), the circumferential direction of one divided portion 31-k is used. Are formed on the end surface 31-kA of the other, and the connection concave portion 31- (k + 1) b is formed on the circumferential end surface 31- (k + 1) B of the other divided portion 31- (k + 1). By fitting the coupling convex portion 31-ka into the coupling concave portion 31- (k + 1) b, one divided portion 31-k and the other divided portion 31- (k + 1) are coupled.
[0026]
In the above-described embodiment, the connecting piece 33 is divided in the direction of the central axis O, for example, as in the outer frame member 13 of the stator 10 of the electric motor according to the fourth modification of the embodiment shown in FIG. It may be possible.
In the fourth modified example, for example, a coupling projection 33-1a is formed on an end surface 33-1A in the direction of the central axis O of one of the divided coupling pieces 33-1 in which the coupling piece 33 is divided into two, A coupling concave portion 33-2b is formed on an end surface 33-2B of the other split coupling piece 33-2 in the direction of the central axis O, and the coupling convex portion 33-1a is fitted into the coupling concave portion 33-2b. Is connected to the other divided connecting piece 33-2.
[0027]
【The invention's effect】
As described above, according to the stator of the electric motor of the present invention, even when external force acts in the lamination direction of the electromagnetic steel sheets, the laminated electromagnetic steel sheets may be turned up or dislodged. It can be reliably prevented.
Furthermore, according to the stator for the electric motor according to the second aspect of the present invention, the outer frame member can be prevented from protruding radially outward from the outer peripheral surface of the tooth core, and the outer frame member is provided. This can prevent the outer diameter of the stator from increasing.
Further, according to the stator for the electric motor according to the third or fourth aspect of the present invention, the outer frame member can be easily mounted on the stator core including the teeth core and the core back core.
Further, according to the stator for the electric motor according to the fifth aspect of the present invention, for example, the stator winding is set around the protruding portion together with the teeth core, and the insulating paint is applied on the surface of the protruding portion. By providing such an insulating film and further applying a heat radiating material on the surface of the insulating film, it is possible to improve the heat radiation of the stator, especially the heat radiation with respect to the heat generated by the stator windings.
[Brief description of the drawings]
FIG. 1 is a perspective view of a stator of an electric motor according to an embodiment of the present invention.
FIG. 2 is a perspective view of an outer frame member of the stator of the electric motor shown in FIG.
FIG. 3 is a perspective view of a tooth core and a core back core of the stator of the electric motor shown in FIG. 1;
FIG. 4 is an exploded perspective view showing a tooth core, a core back core, and an outer frame member in the stator of the electric motor shown in FIG.
5 (a) is a sectional view orthogonal to the circumferential direction of the stator of the electric motor shown in FIG. 1 and including the outer peripheral surface of the teeth core, and FIG. 5 (b) is the fixing of the electric motor shown in FIG. 1; It is sectional drawing orthogonal to the circumferential direction of a child, and containing the recessed part of a teeth iron core.
FIG. 6 is a plan view of a main part of the stator of the electric motor shown in FIG. 1, as viewed from a direction of a center axis O.
FIG. 7 is a plan view of a main part of the stator of the electric motor according to a first modification of the present embodiment, as viewed from the center axis O direction.
FIG. 8 is a plan view of a stator of an electric motor according to a second modification of the present embodiment, as viewed from a direction of a center axis O.
FIG. 9 is a plan view of a stator of an electric motor according to a third modification of the present embodiment, as viewed from a center axis O direction.
FIG. 10 is a diagram of a main part of a stator of an electric motor according to a fourth modified example of the present embodiment viewed from an outer peripheral side toward an inner peripheral side in a radial direction.
[Explanation of symbols]
Reference Signs List 10 Stator 11 Teeth iron core 11a Electromagnetic steel sheets 11B, 11C End face 12 Core back iron core 12a Electromagnetic steel sheets 12B, 12C End face 13 Outer frame member 23 Recess (groove)
31 End face holding piece 32 End face holding piece 33-1a Joining convex part (joining part)
33-2b Coupling recess (coupling portion)
41, 42 Suppressing piece projection (projection)

Claims (5)

A plurality of tooth cores arranged on a predetermined circumference, a stator winding inserted from an outer peripheral side between adjacent tooth cores, and an outer peripheral side of the stator winding between adjacent tooth cores. A stator having a core back iron core provided,
The stator core including the teeth core and the core back core is formed by stacking a plurality of electromagnetic steel sheets,
One and the other end face retaining pieces that contact the outer peripheral portions of the one and the other end faces of the stator core in the lamination direction of the electromagnetic steel sheets, and are connected to the one and the other end face retaining pieces, and are connected to the stator cores. A stator for an electric motor, comprising: an outer frame member including a connection piece fixed by an outer peripheral portion. A plurality of tooth cores arranged on a predetermined circumference, a stator winding inserted from an outer peripheral side between adjacent tooth cores, and an outer peripheral side of the stator winding between adjacent tooth cores. A stator having a core back iron core provided,
The stator core including the tooth core and the core back core is formed by laminating a plurality of electromagnetic steel sheets, and a groove extending along the lamination direction of the electromagnetic steel sheets is formed on an outer peripheral surface of the tooth core,
One and the other end face restraining pieces that contact the outer peripheral portions of the one and the other end faces of the stator core in the lamination direction of the electromagnetic steel sheets, and a connecting piece that connects the one and the other end face restraining pieces, An outer frame member formed in a substantially U-shape as viewed from the circumferential direction of the stator core,
A stator for an electric motor, wherein the connecting piece is engaged with the groove. 3. The electric motor according to claim 1, wherein the connection piece of the outer frame member includes a coupling portion that can be divided and coupled at an intermediate position in a stacking direction of the electromagnetic steel sheets. 4. stator. The fixing of the electric motor according to claim 1, wherein the end surface pressing piece of the outer frame member includes a coupling portion that can be divided and coupled in a circumferential direction of the stator core. 4. Child. The end face holding piece of the outer frame member is provided with a protruding portion that comes into contact with an end face of the teeth core and protrudes radially inward. Electric motor stator.

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