JP2004140924A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor of such structure that the thinning of the motor main body can be contrived by reforming the constitution of a bearing and that the bearing can be provided merely by performing welding, caulking, adhesion, etc. once. <P>SOLUTION: In a stepping motor 1, an end plate 7 and the end face 410 of a first outer stator core 41 are welded to each other for fixing in condition that a bearing plate 6 and the end plate 7 are laid on the end face 410 of the first outer stator core 41. As a result, the second projection 62 of the bearing plate 6 gets caught on the end face 410 of the first outer stator core 41, while in this stator core 41, the first projection 61 of the bearing plate 6 is caught between the end face 410 of the stator core 41 and the end plate 7, within the recess 411 made between the bends of pole teeth 46. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor provided with a stator core whose pole teeth are bent in the motor axial direction at the inner periphery. More specifically, the present invention relates to a support structure for a rotating shaft in a motor having the structure.
[0002]
[Prior art]
As shown in FIG. 8A, the PM stepping motor generally includes a rotor 120 having a permanent magnet 122, a rotating shaft 121 extending from the rotor 120, and a stator 130 disposed so as to surround the rotor 120. have.
[0003]
The stator 130 includes a first outer stator core 141 and a first inner stator core 143 arranged so as to sandwich the first bobbin 142 around which the coil is wound, and a second bobbin around which the coil is wound. The second inner stator core 153 and the second outer stator core 151 are arranged so as to sandwich the 152 from above and below. Here, a plurality of pole teeth formed on each of the first outer stator core 141 and the first inner stator core 143 are arranged along the inner peripheral surface of the first bobbin 142. Similarly, a plurality of pole teeth formed on each of the second outer stator core 151 and the second inner stator core 153 are arranged along the inner peripheral surface of the second bobbin 152.
[0004]
For the stator 130, end plates 180 are attached to the outer surfaces of the first outer stator core 141 and the second stator core 151 in the motor axial direction. A radial bearing 190 for the rotating shaft 121 is attached to the end plate 180, and the radial bearing 190 protrudes from the end plate 180 to the output end side.
[0005]
Further, in the PM type stepping motor, as shown in FIG. 8 (b), instead of the structure in which the radial bearing is attached to the end plate 180, the radial bearing is provided on the base end side 121a (non-output end side) of the rotating shaft 121. A structure in which 191 is supported by an annular member 195 attached to the outer surface of the second outer stator core 151 in the motor axial direction may be employed. In such a case, an end plate 160 is attached to the outer surface of the annular member 195 in the motor axis direction, and the rotating shaft 121 is connected via the radial bearing 191 and the pivot 163 by the leaf spring 161 formed on the end plate 160. Energize toward the output end. Also in the motor having such a structure, an end plate 180 is attached to the end face of the first outer stator 141, but this end plate 180 is for attaching the motor to other devices, A large hole 185 through which the rotary shaft 121 passes is formed.
[0006]
[Problems to be solved by the invention]
In such a PM type stepping motor, since the radial bearings 190 and 191 protrude from the stator 130 in the motor axial direction, the dimension of the motor body in the motor axial direction is at least the radial dimension of the stator 130. Therefore, there is a problem that the thickness cannot be reduced.
[0007]
In the case of the motor shown in FIG. 8A, conventionally, the step of fixing the bearing 190 to the end plate 180 by welding, caulking, adhesion, or the like, and the end plate 190 are welded to the first outer stator core 141. Since it is necessary to perform two processes, such as a process, there is a problem that much time is required for assembly.
[0008]
Accordingly, an object of the present invention is to improve the structure of the bearing so that the motor body can be thinned, and the bearing can be provided only by performing welding, caulking, bonding, etc. once. It is to provide a motor.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, in a motor having a rotating shaft extending from a rotor including a permanent magnet and a stator disposed around the rotor, at least one end of the stator in the motor axial direction The stator core located in the portion includes a plurality of pole teeth that are bent in the motor axial direction at the inner periphery so as to face the permanent magnet, and a concave portion that is recessed in the radial direction is formed between the bent portions of the pole teeth. A bearing plate having a bearing that rotatably supports the rotating shaft is disposed at an end portion of the stator where the stator core is disposed, and an end surface of the stator core is disposed on an outer peripheral side of the bearing plate. An end plate is fixed, and the bearing plate is engaged with an end surface of the stator core, and protrudes into the recess to be hooked on the end surface of the end plate. Characterized in that it comprises a first protrusion that.
[0010]
In the present invention, at one end in the motor axial direction of the stator, the engaging portion of the bearing plate is caught by the end surface of the stator core, while in the recess formed between the bent portions of the pole teeth in the stator core, the bearing The first convex portion of the plate is in a state of being sandwiched between the end face of the stator core and the end plate. For this reason, the bearing plate is restrained by the end plate through the first convex portion toward the outer side in the motor axial direction (the side opposite to the side where the rotor is located), and the inner side in the motor axial direction (where the rotor is positioned). (The side to be) is restrained by the stator core. Therefore, the bearing plate is firmly fixed to the end portion of the stator while having a simple structure. Therefore, it is not necessary to employ a structure in which the bearing is greatly protruded from the end plate for the purpose of firmly fixing the bearing and the end plate, so that the motor can be thinned. Further, when assembling the motor, the bearing plate may be sandwiched between the stator core and the end plate, and the end plate may be fixed to the stator core in a single process such as welding, caulking, and bonding. Therefore, after the bearing is fixed to the end plate by a method such as welding, caulking, or bonding, it is not necessary to perform a time-consuming process of fixing the end plate to the stator core again by a method such as welding, caulking, or bonding. .
[0011]
In the present invention, it is preferable that the bearing plate includes the bearing at a center position thereof, and a distal end portion of the first convex portion is in contact with a depth of the concave portion. If comprised in this way, a stator core and a bearing board can be positioned directly. In addition, since the concave portion can be formed with respect to the stator core with high positional accuracy by pressing, if the bearing plate is positioned with reference to the concave portion, the centering of the bearing can be performed with high accuracy.
[0012]
In the present invention, the engaging portion is formed as a second convex portion protruding from the bearing plate to the outer peripheral side, and the second convex portion is formed on a peripheral edge of the hole in which the bearing plate is disposed in the end plate. It is preferable that a notch to be fitted is formed. That is, if a notch into which the engaging portion of the bearing plate fits is formed with respect to the end plate, the engaging portion of the bearing plate and the end plate do not overlap in the motor axial direction. As a result, the motor can be further reduced in thickness.
[0013]
In the present invention, the second convex portion protrudes from the body portion of the bearing plate to the outer peripheral side without bending in the motor axial direction, while the first convex portion is bent in the motor axial direction. It is preferable to project to the outer peripheral side. If comprised in this way, even if it is the structure where an end plate pinches | interposes a 1st convex part between stator cores, it will aim at thickness reduction of a motor by the part which the 1st convex part is bent in the motor axial direction. be able to.
[0014]
In this invention, it is preferable that the outer end surface of the said bearing plate exists in the position dented rather than the outer end surface of the said end plate in a motor axial direction. If comprised in this way, since a bearing will not protrude at all from an end plate, a motor can be reduced in thickness significantly.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A motor to which the present invention is applied will be described below with reference to the drawings.
[0016]
[Embodiment 1]
1 and 2 are an exploded perspective view and a longitudinal sectional view of a motor according to Embodiment 1 of the present invention. 3A to 3I are respectively a plan view, a cross-sectional view, a bottom view, a plan view of a bearing plate, a cross-sectional view, a bottom view, and a first view of an end plate used in the motor shown in FIGS. FIG. 6 is a plan view, a cross-sectional view, and a bottom view of the outer stator. 4A to 4F are a plan view, a cross-sectional view, a bottom view, and an end plate and a bearing plate in a state where the end plate and the bearing plate shown in FIG. It is the top view, sectional view, and bottom view showing the state.
[0017]
As shown in FIGS. 1 and 2, the stepping motor 1 of this embodiment is a PM type stepping motor, and surrounds the rotor 2 including the permanent magnet 22, the rotating shaft 21 extending from the rotor 2, and the rotor 2. The stator 3 is disposed. The rotor 2 is configured on the base end side (opposite output end side) with respect to the rotating shaft 21 and has a configuration in which the output end side protrudes greatly.
[0018]
The stator 3 includes a first stator set 4 and a second stator set 5. Among these stator sets 4 and 5, the first stator set 4 located on the upper stage side includes a first outer stator core 41, a first bobbin 42 around which a coil 44 is wound, and the bobbin 42 as a first one. Each of the first outer stator core 41 and the first inner stator core 43 along the inner circumferential surface of the first bobbin 42. A plurality of pole teeth 46 are formed in a line. In contrast, the second stator set 5 located on the lower stage side includes a second outer stator core 51, a second bobbin 52 around which the coil 54 is wound, and the bobbin 52 as the second outer stator core 51. A plurality of second inner stator cores 53 sandwiched between the second outer stator core 51 and the second inner stator core 53 along the inner peripheral surface of the second bobbin 52. Pole teeth 56 are lined up.
[0019]
In the stepping motor 1 configured as described above, the rotating shaft 21 is supported in a both-end supported state, and the support structure thereof will be described in detail below. In this embodiment, the output end side and the counter-output end side in the motor axial direction are used. The support structure is the same. Therefore, in the following description, the structure on the output end side will be mainly described.
[0020]
In the present embodiment, the first outer stator core 41 located at the end of the stator 3 is connected to the permanent magnet 22 (see FIGS. 1 and 2) as shown in FIGS. 2 and 3 (g) to (i). Five pole teeth 46 that bend in the motor axial direction at the inner peripheral edge of the end face 410 are provided so as to face each other, and five recesses 411 that are recessed in the radial direction are spaced between the bent portions of these pole teeth 46 at equal angular intervals. Is formed.
[0021]
As shown in FIG. 2 and FIGS. 3D to 3F, a bearing plate 6 having a cylindrical bearing 65 that supports the rotating shaft 21 rotatably is disposed at the end of the stator 3. ing. The bearing plate 6 includes a substantially circular main body portion 60, five first protrusions 61 protruding from the main body portion 60 toward the outer peripheral side, and three second protrusions protruding from the main body portion 60 toward the outer peripheral side. It is a disk-shaped resin molded product provided with the convex part 62 (engagement part).
[0022]
Of these convex portions 61, 62, the second convex portion 62 protrudes more greatly on the outer peripheral side than the first convex portion 61. The second convex portion 62 protrudes from the main body portion 60 to the outer peripheral side without being bent in the motor axial direction, while the first convex portion 61 is located on the inner side in the motor axial direction (the one on which the rotor 2 is positioned). ) Bent slightly toward
[0023]
As shown in FIG. 2 and FIGS. 3A to 3C, a ring-shaped metal end plate 7 is disposed around the bearing plate 6 at the end of the stator 3. The end surface 410 of the first outer stator core 41 is fixed by a method such as welding. The end plate 7 is formed with a hole 70 having a shape along the outer peripheral contour of the portion excluding the first convex portion 61 of the bearing plate 6. The second convex portion 62 is formed along the peripheral edge of the hole 70. Three notches 71 are formed at positions corresponding to.
[0024]
In assembling the stepping motor 1 using such a member, in this embodiment, first, as shown in FIGS. 4A to 4C, the bearing plate 6 and the end plate 7 are overlapped. As a result, the second convex portion 62 of the bearing plate 6 is fitted into the notch 71 of the end plate 7.
[0025]
Next, after passing the rotating shaft 21 through the bearing 65 of the bearing plate 6 in this state, the bearing plate 6 and the end plate 7 are connected to the first outer stator core 41 as shown in FIGS. Alignment is performed so that the first convex portion 61 of the bearing plate 6 fits into the concave portion 411 of the first outer stator core 41. When alignment is performed in this manner, the tip portion 610 of the first convex portion 61 comes into contact with the back 412 of the concave portion 411. In this way, the bearing plate 6 is positioned in the radial direction.
[0026]
Then, the end plate 7 and the end surface 410 of the first outer stator core 41 are welded and fixed.
[0027]
As a result, at the end portion of the stator 3 in the motor axial direction, the second convex portion 62 of the bearing plate 6 is caught by the end surface 410 of the first outer stator core 41, while the stator core 41 is between the bent portions of the pole teeth 46. In the formed recess 411, the first protrusion 61 of the bearing plate 6 is in a state of being sandwiched between the end surface 410 of the stator core 41 and the end plate 7.
[0028]
The bearing plate 6 and the end plate 7 provided with the bearing 65 are also arranged on the second outer stator core 51 side. The configuration of this portion is the same as that of the first outer stator core 41 side. Therefore, the description is omitted.
[0029]
Thus, in this embodiment, the bearing plate 7 is restrained by the end plate 7 via the first convex portion 61 toward the outer side in the motor axial direction (the side opposite to the side where the rotor 2 is located). It is in a state of being restrained by the first outer stator core 61 toward the inner side in the axial direction (the side where the rotor 2 is located). Therefore, the bearing plate 6 is firmly fixed to the end portion of the stator 3 with a simple structure. Further, the outer end surface of the bearing plate 7 is recessed from the end plate 7 in the motor axial direction. Therefore, since it is not necessary to employ a structure in which the bearing 65 protrudes greatly from the end plate 7, it is possible to reduce the thickness of the motor.
[0030]
Here, the bearing 65 protrudes toward the rotor 2, but since the end surface of the rotor 2 is recessed so as to escape from the bearing 5, there is no hindrance to the rotation of the rotor 2.
[0031]
Further, when assembling the stepping motor 1, the bearing plate 6 is sandwiched between the first outer stator core 41 and the end plate 7, and the end plate 7 is welded, caulked, bonded, or the like to the first outer stator core 41. A single process of fixing is sufficient. Therefore, after fixing the bearing to the end plate by a method such as welding, caulking, or adhesion, it is necessary to perform a time-consuming process of fixing the end plate to the stator core again by a method such as welding, caulking, or adhesion. Absent.
[0032]
Further, in the present embodiment, the bearing plate 6 includes a bearing 65 at the center position, and the tip portion 610 of the first convex portion 61 is in contact with the back 412 of the concave portion 411. For this reason, the first outer stator core 41 and the bearing plate 6 can be positioned directly. In addition, the formation of the recess 411 with respect to the first outer stator core 41 can be performed with high positional accuracy by pressing. Therefore, if the bearing plate 6 is positioned with reference to the recess 41, the centering of the bearing 65 can be performed with high accuracy. It can be carried out.
[0033]
Furthermore, in the end plate 7, since the notch 71 into which the 2nd convex part 62 fits is formed in the periphery of the hole 70 in which the bearing plate 6 is arrange | positioned, the 2nd convex part 62 and the end plate of the bearing plate 6 are formed. 7 does not overlap in the motor axis direction. Therefore, the thickness of the stepping motor 1 can be reduced by at least the thickness of the second convex portion 62.
[0034]
Furthermore, the second convex portion 62 protrudes from the body portion 60 of the bearing plate 6 to the outer peripheral side without being bent in the motor axial direction, while the first convex portion 61 is bent in the motor axial direction. Since the end plate 7 projects from the outer peripheral side to the first outer stator core 41, the first convex portion 61 is bent in the motor axis direction even if the first convex portion 61 is sandwiched between the end plate 7 and the first outer stator core 41. Therefore, the stepping motor 1 can be thinned. For example, the stepping motor 1 having a structure in which the end surface of the bearing 65 is recessed from the outer end surface of the end plate 7 in the motor axial direction can be realized.
[0035]
[Embodiment 2]
FIG. 5 is a longitudinal sectional view of a motor according to Embodiment 2 of the present invention. 6A to 6I are a plan view, a cross-sectional view, a bottom view, a plan view of a bearing plate, a cross-sectional view, a bottom view, and an end plate, respectively, of the second outer stator core used in the motor shown in FIG. It is a top view, sectional drawing, and bottom view. 7A to 7F are a plan view, a cross-sectional view, a bottom view, and an end plate and a bearing plate in a state where the end plate and the bearing plate shown in FIG. It is the top view, sectional view, and bottom view showing the state.
[0036]
As shown in FIG. 5, the stepping motor 1a of the present embodiment is also a PM type stepping motor as in the first embodiment, and includes a rotor 2 including a permanent magnet 22, a rotating shaft 21 extending from the rotor 2, and a rotor 2 And a stator 3 arranged so as to surround the. The rotor 2 is configured on the base end side (opposite output end side) with respect to the rotating shaft 21 and has a configuration in which the output end side protrudes greatly.
[0037]
The stator 3 includes a first stator set 4 and a second stator set 5. Among these stator sets 4 and 5, the first stator set 4 located on the upper stage side includes a first outer stator core 41, a first bobbin 42 around which a coil 44 is wound, and the bobbin 42 as a first one. Each of the first outer stator core 41 and the first inner stator core 43 along the inner circumferential surface of the first bobbin 42. A plurality of pole teeth 46 are formed in a line. In contrast, the second stator set 5 located on the lower stage side includes a second outer stator core 51, a second bobbin 52 around which the coil 54 is wound, and the bobbin 52 as the second outer stator core 51. A plurality of second inner stator cores 53 sandwiched between the second outer stator core 51 and the second inner stator core 53 along the inner peripheral surface of the second bobbin 52. Pole teeth 56 are lined up.
[0038]
In the stepping motor 1 of this embodiment, the rotating shaft 21 is in a single-supported state, and only the base end side 21a of the rotating shaft 21 is supported. That is, in the stepping motor 1 of this embodiment, the end plate 6b is fixed to the first outer stator core 41, but the end plate 6b is only formed with a large hole 61b through which the rotary shaft 21 passes. Thus, it does not contribute to the support of the rotating shaft 21.
[0039]
On the other hand, a support mechanism as described below is configured on the base end side 21 a of the rotating shaft 21.
[0040]
In the present embodiment, the second outer stator core 51 located at the end of the stator 3 in the motor axial direction has the permanent magnet 22 (FIGS. 1 and 2) as shown in FIGS. 5 and 6A to 6C. 5 pole teeth 56 bent in the motor axial direction at the inner peripheral edge of the end surface 510 so as to oppose each other), and between the bent portions of these pole teeth 56, five recesses 511 recessed in the radial direction are provided. Are formed at equiangular intervals.
[0041]
As shown in FIGS. 5 and 6D to 6F, a bearing plate 6a including a bearing 65a that rotatably supports the rotary shaft 21 is disposed at the end of the stator 3. The bearing plate 6a includes a substantially circular main body portion 60a, four first protrusions 61a protruding from the main body portion 60a toward the outer peripheral side, and three second protrusions protruding from the main body portion 60a toward the outer peripheral side. It is a disk-shaped resin molded product provided with the convex part 62a. In this embodiment, the bearing plate 6a is formed with a groove 66a that is largely cut out so as to reach the bearing 65a.
[0042]
Here, the 2nd convex part 62a protrudes largely on the outer peripheral side rather than the 1st convex part 61a. Further, the second convex portion 62a protrudes from the main body portion 60a to the outer peripheral side without being bent in the motor axial direction, while the first convex portion 61a is located on the inner side in the motor axial direction (the one on which the rotor 2 is positioned). ) Bent slightly toward
[0043]
As shown in FIGS. 5 and 6G to 6I, a thin end plate 7a made of metal is disposed around the bearing plate 6a at the end of the stator 3, and the end plate 7a 2 is fixed to the end surface 510 of the outer stator core 51 by a method such as welding. The end plate 7a is formed with a hole 70a having a shape substantially along the outer peripheral contour of the portion excluding the first convex portion 61a of the bearing plate 6a. A second convex portion is formed along the periphery of the hole 70a. Three notches 71a are formed at positions corresponding to 62a. Further, a leaf spring 76a is formed on the end plate 7a so as to reach the bearing 65a of the bearing plate 6a from the inner peripheral edge of the hole 70a, and the leaf spring 76a connects the rotary shaft 21 to the output end as shown in FIG. It bears the function of energizing towards the side.
[0044]
In assembling the stepping motor 1 using such a member, in this embodiment, first, as shown in FIGS. 7A to 7C, the bearing plate 6a and the end plate 7a are overlapped. As a result, the second convex portion 62a of the bearing plate 6a is fitted into the notch 71a. Further, the leaf spring 76a of the end plate 7a reaches the bearing 65a through the groove 66a of the bearing plate 6a.
[0045]
Next, as shown in FIGS. 7D to 7F, the bearing plate 6a and the end plate 7a are overlapped with the end surface 510 of the second outer stator core 51, and the first convex portion 61a of the bearing plate 6a is the first one. Positioning is performed so as to fit in the recess 511 of the second outer stator core 51. When alignment is performed in this manner, the tip portion 610a of the first convex portion 61a comes into contact with the back 512 of the concave portion 511.
[0046]
Then, the end plate 7a and the end surface 510 of the second outer stator core 51 are welded and fixed.
[0047]
As a result, at the end portion of the stator 3 in the motor axial direction, the second convex portion 62a of the bearing plate 6a is caught by the end surface 510 of the second outer stator core 51. In the concave portion 511 formed in the first concave portion 511, the first convex portion 61a of the bearing plate 6a is sandwiched between the end surface 510 of the stator core 51 and the end plate 7a.
[0048]
Thus, also in the present embodiment, as in the first embodiment, the bearing plate 7a has an end through the first convex portion 61a toward the outer side in the motor axial direction (the side opposite to the side where the rotor 2 is located). It is constrained by the plate 7a and is constrained by the second outer stator core 51 toward the inner side in the motor axial direction (the side where the rotor 2 is located). Therefore, the bearing plate 6 a is firmly fixed to the end portion of the stator 3 with a simple structure. Therefore, it is not necessary to employ a structure in which the bearing is greatly protruded from the end plate for the purpose of firmly fixing the bearing and the end plate, so that the motor can be thinned. Further, when the stepping motor 1 is assembled, the end plate 7 is welded, caulked, bonded, etc. to the second outer stator core 51 so that the bearing plate 6a is sandwiched between the second outer stator core 51 and the end plate 7. What is necessary is just to fix by a method. Therefore, after fixing the bearing to the end plate by a method such as welding, caulking, or adhesion, it is necessary to perform a time-consuming process of fixing the end plate to the stator core again by a method such as welding, caulking, or adhesion. The effects similar to those of the first embodiment are obtained.
[0049]
【The invention's effect】
As described above, in the present invention, at one end portion of the stator in the motor axial direction, the engaging portion of the bearing plate is hooked on the end surface of the stator core, while the stator core is formed between the bent portions of the pole teeth. In the concave portion, the first convex portion of the bearing plate is sandwiched between the end face of the stator core and the end plate. For this reason, the bearing plate is restrained by the end plate through the first convex portion toward the outer side in the motor axial direction (the side opposite to the side where the rotor is located), and the inner side in the motor axial direction (where the rotor is positioned). (The side to be) is restrained by the stator core. Therefore, the bearing plate is firmly fixed to the end portion of the stator while having a simple structure. Therefore, it is not necessary to employ a structure in which the bearing is greatly protruded from the end plate for the purpose of firmly fixing the bearing and the end plate, so that the motor can be thinned. Further, when assembling the motor, the end plate may be fixed to the stator core by welding, caulking, bonding, or the like so that the bearing plate is sandwiched between the stator core and the end plate. Therefore, after fixing the bearing to the end plate by a method such as welding, caulking, or adhesion, it is necessary to perform a time-consuming process of fixing the end plate to the stator core again by a method such as welding, caulking, or adhesion. Absent.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a motor according to Embodiment 1 of the present invention.
FIG. 2 is a longitudinal sectional view of the motor shown in FIG.
FIGS. 3A to 3I are a plan view, a cross-sectional view, a bottom view, a plan view of a bearing plate, a cross-sectional view, a bottom view, and a plan view of an end plate used in the motor shown in FIGS. 1 and 2, respectively. It is a top view, a sectional view, and a bottom view of the first outer stator.
4 (a) to (f) are a plan view, a cross-sectional view, a bottom view, and an end plate and a bearing plate in a state where the end plate and the bearing plate shown in FIG. It is a top view, a sectional view, and a bottom view showing the state attached to.
FIG. 5 is a longitudinal sectional view of a motor according to Embodiment 2 of the present invention.
6A to 6I are a plan view, a cross-sectional view, a bottom view, a plan view of a bearing plate, a cross-sectional view, a bottom view, and a first outer stator core used in the motor shown in FIG. It is a top view of an end plate, a sectional view, and a bottom view.
7A to 7F are a plan view, a cross-sectional view, a bottom view, and a first outer stator core in which the end plate and the bearing plate shown in FIG. It is a top view, a sectional view, and a bottom view showing the state attached to.
8A and 8B are longitudinal sectional views showing a conventional motor, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stepping motor 2 Rotor 3 Stator 4 1st stator set 5 2nd stator set 6, 6a Bearing plate 7, 7a End plate 21 Rotating shaft 22 Permanent magnet 41 1st outer stator core 43 1st inner stator core 46, 56 Polar teeth 51 Second outer stator core 53 Second inner stator core 61, 61a First convex portion 62, 62a Second convex portion (engagement portion)
65, 65a Bearing 71 Notch 411, 511 Concave part 411a, 511a of outer stator core Back part 610, 610a of concave part Tip part of first convex part

Claims (5)

In a motor having a rotating shaft extending from a rotor provided with a permanent magnet, and a stator disposed around the rotor,
The stator core positioned at at least one end of the stator in the motor axial direction includes a plurality of pole teeth bent in the motor axis direction at the inner periphery so as to face the permanent magnet, and the bent portion of the bent portion of the pole teeth A recess recessed in the radial direction is formed between them,
A bearing plate having a bearing that rotatably supports the rotating shaft is disposed at an end of the stator where the stator core is disposed, and an end surface of the stator core is disposed on an outer peripheral side of the bearing plate. The board is fixed,
The bearing plate includes an engaging portion that is hooked on an end surface of the stator core, and a first convex portion that protrudes into the concave portion and hooks on the end surface of the end plate. 2. The motor according to claim 1, wherein the bearing plate includes the bearing at a central position thereof, and a tip portion of the first convex portion is in contact with a depth of the concave portion. 3. The engagement portion according to claim 1, wherein the engagement portion is formed as a second protrusion protruding from the bearing plate to the outer peripheral side, and the second end portion of the end plate is disposed at a periphery of the hole in which the bearing plate is disposed. A motor having a notch into which a convex portion of the motor is fitted. 4. The method according to claim 3, wherein the second convex portion projects from the main body portion of the bearing plate to the outer peripheral side without being bent in the motor axial direction, while the first convex portion extends in the motor axial direction. A motor characterized in that it is bent to the outer peripheral side after bending. 5. The motor according to claim 1, wherein an outer end surface of the bearing plate is in a position recessed from an outer end surface of the end plate in the motor axial direction.

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