JP3622735B2 - Stator piece positioning structure for rotating electrical machines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning structure for a stator piece constituting a stator in a rotating electrical machine (an electric motor or a generator), and more particularly to a stator piece positioning structure for positioning with low accuracy and high accuracy with respect to brackets at both axial ends of the stator. Is.
[0002]
[Prior art]
Conventionally, as a rotating electrical machine, for example, a permanent magnet type rotary synchronous motor as described in JP 2001-359261 A is known.
In order to explain a conventional rotating electrical machine for this motor, a stator piece formed by laminating stator steel plates in the stator axial direction is arranged in a circle with an electromagnetic coil wound thereon, and a stator core is formed. A rotating electric machine is composed of a stator that is sandwiched between brackets arranged on both sides of the stator in the axial direction and molded with resin or the like, and a rotor that rotates relative to the stator.
[0003]
The rotor is composed of a laminated core formed by laminating electromagnetic steel plates in the rotor rotational axis direction, and a permanent magnet inserted in the laminated core in the rotor rotational axis direction.
In driving the motor, the rotor can be driven to rotate synchronously by generating a rotating magnetic field in the stator in accordance with the rotational position of the rotor, that is, the position of the permanent magnet provided thereon as described above.
[0004]
By the way, since the stator is attached to the housing via the bracket, and the bracket is positioned with respect to the housing, each stator piece is bracketed at a stage before the stator pieces in a circular arrangement are molded as described above to form a stator. Therefore, it is necessary to position with high accuracy.
Otherwise, when the stator is attached to the housing via the bracket, the clearance between the rotor and the rotor that is also rotatably supported by the housing cannot be properly secured, and interference occurs between the stator and the rotor. Or a decrease in electromagnetic field performance.
[0005]
For this reason, conventionally, when positioning each stator piece with respect to the bracket, as described in the above-mentioned document, the corresponding end of the stator piece is fitted to the surface of the bracket against which the stator piece is abutted, and is held in a mold type. Such a method has been adopted in which a plurality of sets of ribs are erected and the stator pieces are constrained in all directions within a plane crossing the stator axis by the plurality of sets of ribs.
[0006]
[Problems to be solved by the invention]
However, when the stator piece is positioned with respect to the bracket by holding the end of each stator piece by a plurality of sets of ribs provided on the bracket in this way, the above-mentioned so as to satisfy the expected high positioning accuracy. It is extremely difficult to provide the ribs, and even when possible, it is extremely impractical to make the ribs with high accuracy if the ribs are made with high accuracy.
[0007]
Also, from the viewpoint of assembly work in which a large number of stator pieces are assembled in a circular arrangement with respect to the brackets to form a stator core, first, the individual stator pieces are fitted to one of the brackets in a state where they are fitted to the plurality of sets of ribs. After all the stator pieces have been erected, it is a work procedure for simultaneously fitting a plurality of pairs of corresponding ribs on the other bracket to the other ends of all the stator pieces. However, it is difficult to deny the deterioration of workability.
[0008]
In the present invention, instead of the method of positioning the stator piece by fitting to a set of a plurality of ribs provided on the bracket as described above, the holes provided in the bracket and the stator piece and the pins inserted into the holes are provided. An object of the present invention is to propose a stator piece positioning structure for a rotating electrical machine in which the above-mentioned problems are eliminated by positioning between them.
[0009]
[Means for Solving the Problems]
To this end, according to the present invention, as described in claim 1, in the rotating electric machine of the above type, the stator piece and the bracket are provided with alignment holes extending in the axial direction of the stator and aligned with each other. A positioning pin is inserted into the alignment hole of the piece and the bracket to position the stator piece with respect to the bracket.
[0010]
【The invention's effect】
According to the configuration of the present invention, the stator pieces are positioned in a predetermined circular arrangement state with respect to the brackets before the stator pieces in the circular arrangement are sandwiched between the brackets on both sides in the stator axial direction and molded into the stator. At this time, the positioning is performed by the alignment holes and the positioning pins inserted in these holes.
[0011]
Therefore, it is easier and cheaper to align the stator pieces with the brackets by positioning the stator pieces with respect to the brackets by holding the ends of the stator pieces with a plurality of sets of ribs provided on the bracket as in the prior art. Each stator piece can be positioned with respect to the bracket with high accuracy.
[0012]
In addition, from the viewpoint of assembly work in which a large number of stator pieces are assembled in a circular arrangement with respect to the bracket to form a stator core, it is not necessary to insert positioning pins into all the stator pieces at the same time. A work procedure for inserting and assembling the work can be employed, and workability can be improved because there is no simultaneous work.
[0013]
In addition, the alignment hole provided in the stator piece is a blind hole whose end portion far from the bracket is closed.
In this case, since the alignment hole does not penetrate the stator piece, the deterioration of the electromagnetic field performance can be reduced.
[0014]
In addition, as described in claim 2, it is preferable to form a plurality of sets of alignment holes provided on one end of the bracket and one end face of the stator piece related to the one bracket.
In this case, the resistance against the tilt in the circumferential direction of the stator that acts on the stator piece during operation increases, and the positioning accuracy of the stator piece can be kept unchanged.
[0015]
At this time, as described in claim 3 , two sets of alignment holes are provided in one end surface of the stator piece related to one bracket and the one bracket, and the other bracket and the stator piece related to the other bracket are arranged. It is better to make one set of alignment holes provided on the other end surface,
In this case, the above-described effects can be achieved with a minimum number of alignment holes and positioning pins.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show a rotating electric machine having a stator piece positioning structure according to an embodiment of the present invention, and this rotating electric machine is configured as a composite current multilayer motor in the present embodiment.
First, the overall structure of the composite current multilayer motor will be described with reference to FIGS. 1 and 2. This motor is composed of one annular stator 1 and an inner rotor 2 and an outer rotor 3 arranged coaxially on the inner and outer circumferences thereof, respectively. These are configured by being housed in the housing 4.
[0017]
For this storage, a torque transmission shell 5 is provided on the outer periphery of the outer rotor 3 by driving connection with the key 6 in FIG. 2, and both ends of the torque transmission shell 5 are rotated to the housing 4 by bearings 7 and 8 as shown in FIG. The torque transmission shell 5 is coupled to the hollow outer rotor shaft 9 on the bearing 8 side.
[0018]
The inner rotor 2 is provided through the inner rotor shaft 10 in the center, and the inner rotor 2 and the inner rotor shaft 10 are drivingly coupled by a key 11.
One end of the inner rotor shaft 10 is rotatably supported by a bearing 12 in a fixed stator bracket 13, and the other end is rotatably supported by a bearing 14 on a corresponding end wall of the torque transmission shell 5.
[0019]
The stator 1 includes a stator piece 16 formed by laminating I-shaped stator steel plates 15 made by press-forming electromagnetic steel plates as shown in FIG. 2 in the stator axial direction.
Each stator piece 16 is wound with an electromagnetic coil 17 at a location of the tooth 15c between the outer rotor side yoke 15a and the inner rotor side yoke 15b, and these coiled stator pieces 16 are equally spaced in the same circumferential direction. In other words, the stator cores are arranged in a circle to form a stator core, and the stator core is integrated by being clamped between the brackets 13 and 18 (see FIG. 1) on both sides in the stator axial direction with bolts 19 and entirely molded with the resin 20. The stator 1 is configured. In addition, the above-described bolt 19 is positioned between the adjacent stator pieces 16 as shown in FIG.
[0020]
Such a stator 1 cannot be directly supported by the housing 4 on the end side where the outer rotor shaft 9 exists, and thus is supported in a cantilever type by the following structure.
That is, as clearly shown in FIG. 1, the central hollow shaft portion 21 protrudes on the side of the bracket 13 far from the stator 1, passes through the corresponding end wall of the housing 4, and is tightened with the nut 22. Are positioned in the axial direction and supported on the housing 4 in a cantilever manner.
At this time, the relative position in the circumferential direction between the bracket 13 and the housing 4 is determined by the positioning pins 23 inserted therein.
[0021]
Each of the inner rotor 2 and the outer rotor 3 includes laminated cores 24 and 25 that are laminated in the rotor axial direction of a plate material made by press-molding electromagnetic steel sheets and the like. The permanent magnets 26 and 27 penetrating in the direction are arranged at equal intervals in the circumferential direction.
In driving the motor, a composite current obtained by combining the drive currents for the rotors 2 and 3 according to the rotational positions of the inner rotor 2 and the outer rotor 3, that is, the positions of the permanent magnets provided as described above, is used. By supplying to the electromagnetic coil 17 of the stator 1 and thereby generating a rotating magnetic field for both the rotors 2 and 3 individually in the stator, the rotors 2 and 3 can be individually rotated in synchronization with the rotating magnetic field. .
[0022]
By the way, since it is necessary to determine the circumferential position of the electromagnetic coil 17 with respect to the housing 4 for control purposes, the stator 1 positioned circumferentially with respect to the housing 4 by the pin 23 (see FIG. 1) as described above. It is necessary to position each stator piece 16 in the circumferential direction with respect to the bracket 13 (and hence the bracket 18).
[0023]
In the present embodiment, such positioning is performed as follows.
That is, as shown in FIGS. 1 and 2, the brackets 13 and 18 and the stator pieces 16 each have two sets of alignment holes 31 to 35 extending in the stator axial direction and aligned with each other, that is, the holes 31 of the bracket 13 and A first set of alignment holes comprising holes 34 in the stator piece 16 and a second set of alignment holes comprising holes 32 in the bracket 13, holes 35 in the stator piece 16 and holes 33 in the bracket 18 are provided.
[0024]
Here, the alignment holes 31 to 35 are arranged so as to align with the brackets 13 and 18 when the respective stator pieces 16 reach a predetermined circumferential position, and the positioning pins 36 to 36 are disposed in the opening ends of the holes facing each other at the time of alignment. 38 is inserted to position each stator piece 16 with respect to the brackets 13 and 18 individually.
In the present embodiment, the alignment holes 34 and 35 provided in the stator piece 16 are through holes that penetrate the stator piece 16 in the stator axial direction.
[0025]
According to the positioning structure of the stator piece 16 according to the present invention described above, the stator pieces 16 in a circular arrangement are sandwiched between the bolts 19 by the brackets 13 and 18 on both sides in the stator axial direction and molded with the resin 20 before being formed into the stator. When positioning each stator piece 16 in a predetermined circular arrangement with respect to the brackets 13 and 18, the positioning is performed by the alignment holes 31 to 35 and the positioning pins 36 to 38 inserted in these holes.
Alignment holes 31 to 35 and positioning pins that are simpler and less expensive than the case of positioning the stator piece with respect to the bracket by wrapping the end of each stator piece with a plurality of pairs of ribs provided on the bracket as in the past. Each stator piece 16 can be positioned with respect to the brackets 13 and 18 with high accuracy by 36-38.
[0026]
Further, from the viewpoint of assembly work in which a large number of stator pieces 16 are assembled in a circular arrangement with respect to the brackets 13 and 18 to form a stator core, it is not necessary to insert the positioning pins 36 to 38 into all the stator pieces 16 at the same time. It is possible to employ a work procedure in which the positioning pins 36 to 38 are sequentially inserted into the stator piece 16 to perform the assembly, and workability can be improved by the absence of simultaneous work.
[0027]
Furthermore, in the present embodiment, since the alignment holes 34 and 35 provided in the stator piece 16 are through holes that penetrate the stator piece 16 in the stator axial direction, the alignment holes provided at both ends of the stator piece 16 in the stator axial direction are simultaneously provided. It is possible to improve the workability of the alignment holes 34 and 35.
[0028]
As in this embodiment, two sets of alignment holes 31, 34, 32, and 35 provided on one end face of one bracket 13 and the stator piece 16 related thereto, and the other bracket 18 and the related stator are provided. When the alignment holes 33 and 35 provided on the other end surface of the piece 16 are set as one set, the resistance against the circumferential collapse of the stator acting on the stator piece 16 during operation is increased, and the positioning accuracy of the stator piece is kept unchanged. In addition, this effect can be achieved with a minimum number of alignment holes and positioning pins.
[0029]
FIG. 3 shows another embodiment of the present invention. In this embodiment, the alignment holes 34 provided in each stator piece 16 are not formed as through holes as shown in FIG. A blind hole is set to the minimum depth required for the positioning pin 36 to penetrate, and the alignment holes 35a and 35b provided in the stator piece 16 corresponding to the alignment hole 35 in FIG. Instead, the blind hole must have a minimum depth necessary for the positioning pins 37 and 38 to penetrate.
In this case, since the alignment holes 34, 35a, and 35b do not penetrate the stator pieces 16, it is possible to reduce the deterioration of the electromagnetic field performance.
[Brief description of the drawings]
FIG. 1 is a vertical side view of a composite current multilayer motor having a stator piece positioning structure according to an embodiment of the present invention.
FIG. 2 is a longitudinal front view showing the stator of the composite current multilayer motor as viewed in the axial direction.
FIG. 3 is a longitudinal side view similar to FIG. 1, showing a stator piece positioning structure according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator 2 Inner rotor 3 Outer rotor 4 Housing 5 Torque transmission shell 6 Key 7 Bearing 8 Bearing 9 Outer rotor shaft 10 Inner rotor shaft 11 Key 12 Bearing 13 Bracket 14 Bearing 15 Stator steel plate 16 Stator piece 17 Electromagnetic coil 18 Bracket 19 Bolt 20 Mold resin 21 Center hollow shaft portion 22 Nut 23 Positioning pin 24 Laminated core 25 Laminated core 26 Permanent magnet 27 Permanent magnet 31 Alignment hole 32 Alignment hole 33 Alignment hole 34 Alignment hole 35 Alignment hole 35a Alignment hole 35b Alignment hole 36 Locating pin 37 Locating Pin 38 Positioning pin

Claims (3)

A stator core obtained by stacking stator pieces formed by stacking stator steel plates in the stator axial direction in a circular shape and sandwiched between brackets arranged on both sides of the stator axial direction and molded, and the stator In a rotating electrical machine comprising a rotor that rotates relatively,
Each of the stator piece and the bracket is provided with alignment holes extending in the stator axial direction and aligned with each other,
A positioning pin is inserted into the alignment holes of the stator piece and the bracket to position the stator piece with respect to the bracket .
A stator piece positioning structure for a rotating electrical machine, wherein the alignment hole provided in the stator piece is a blind hole whose end far from the bracket is closed . The stator piece positioning structure for a rotating electric machine according to claim 1, wherein a plurality of sets of alignment holes provided on one end surface of the stator piece related to one of the brackets and the one bracket are provided . Stator piece positioning structure. The stator piece positioning structure for a rotating electrical machine according to claim 2 , wherein two sets of alignment holes are provided in one end surface of the stator piece related to one of the brackets and the one bracket, the other bracket, and the other bracket. A stator piece positioning structure for a rotating electrical machine, characterized in that a set of alignment holes provided on the other end surface of the stator piece according to the above.

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