JP2020018036A - motor - Google Patents

Abstract

To provide a motor which is hard to be vibrated during rotation.SOLUTION: A motor comprises a shaft 2 and multiple plates each including an inner peripheral part 6c. On an outer peripheral surface of the shaft 2, multiple knurls 2v, 2w, 2x, 2y and 2z in a recessed or projected shape are provided while being placed side by side with each other in a length direction of the shaft 2. Each of the multiple knurls 2v, 2w, 2x, 2y and 2z is fitted with the inner peripheral part 6c of any one of the multiple plates.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a motor, and more particularly, to a motor having a structure in which a stator having an inner peripheral portion is attached to a shaft.

  There is a motor having a structure in which a stator having an inner peripheral portion is attached to a shaft. As for a connection structure between a shaft and a stator used in such a motor, there is known a structure in which a surface of a shaft is subjected to knurling as described in Patent Document 1 below.

JP-A-58-039250

  An object of the present invention is to provide a motor that is less likely to generate vibration during rotation.

  According to one aspect of the present invention, in order to achieve the above object, a motor includes a shaft, and a plurality of magnetic members having an inner peripheral portion. A plurality of convex fitting portions are provided, and each of the plurality of fitting portions is fitted to any one of the inner peripheral portions of the plurality of magnetic members.

  Preferably, each of the plurality of magnetic members has an outer peripheral portion and a surface surrounded by the outer peripheral portion, and a plurality of stripes are formed on each surface of the plurality of magnetic members, and a plurality of fitting portions are formed. A first magnetic member of the plurality of magnetic members is fitted to the first fitting portion, and a second magnetic member of the plurality of magnetic members is fitted to the second fitting portion of the plurality of fitting portions. The direction of the streaks of the first magnetic member is different from the direction of the streaks of the second magnetic member.

  Preferably, the third magnetic member of the plurality of magnetic members is fitted to the third fitting portion of the plurality of fitting portions, and the direction of the streaks of the third magnetic member is the first magnetic member. The direction of the streaks of the member is different from the direction of the streaks of the second magnetic member.

  Preferably, the plurality of fitting portions are arranged in a line in the longitudinal direction of the shaft.

  Preferably, the plurality of magnetic members are formed of a plurality of groups, and each of the plurality of groups includes two or more magnetic members that fit together.

  Preferably, the two or more magnetic members fitted to each other are provided with a magnetic member provided with a convex portion on the surface of the magnetic member and a concave portion fitted with the convex portion on the surface of the magnetic member. And a magnetic member.

  Preferably, a plurality of stripes are formed on each surface of the plurality of magnetic members, and the plurality of magnetic members are formed of a plurality of groups, and a first group of the plurality of magnetic members has the plurality of groups. The direction of the muscle is different from the direction of the muscle of the magnetic member of the second group among the plurality of groups.

  According to these inventions, it is possible to provide a motor that does not easily generate vibration during rotation.

FIG. 2 is a cross-sectional view showing a motor according to one of the embodiments of the present invention. It is a figure which shows typically the cross section in the AA line of FIG. It is a side view which shows a shaft and a core. It is a figure showing a plate. It is a sectional side view of a plate. It is a sectional side view of a core. It is a side view of a shaft. It is a figure explaining the process of attaching a core to a shaft. It is a side view which shows the shaft which concerns on the modification of this Embodiment. It is a side view which shows the shaft and core which concern on the modification of this Embodiment.

  Hereinafter, a motor according to one embodiment of the present invention will be described.

  In the following description, a direction parallel to the motor shaft may be referred to as a rotation axis direction. Further, the rotation axis direction may be referred to as the front-back direction (the direction in which the bracket is provided as viewed from the motor frame is the rear direction). In addition, a specific direction (specifically, described later) among directions (radial directions) perpendicular to the rotation axis of the motor may be referred to as a vertical direction, and a direction perpendicular to the front-rear direction and the vertical direction may be referred to as a left-right direction. . The terms "front and rear," "up and down," "left and right," and the like are indications adopted for convenience only when focusing on the motor, and the direction in a device in which this motor is mounted and the use of this motor There is no limitation on the posture.

  [Embodiment]

  FIG. 1 is a sectional view showing a motor according to one embodiment of the present invention. FIG. 2 is a diagram schematically showing a cross section taken along line AA of FIG.

  The cross section shown in FIG. 1 is a cross section shown as line BB in FIG. Note that some components are schematically shown. In the following figures, the arrow A1 indicates the rotation axis direction, that is, the front-back direction. The arrow A2 indicates the left-right direction (the left direction is the left direction in FIG. 2). Arrow A3 indicates the up-down direction (upward in FIG. 2).

  The motor 1 has a frame assembly 1a and an armature assembly 1b rotatable with respect to the frame assembly 1a.

  The amateur assembly 1b has a shaft (rotating shaft) 2, an armature 4 attached to the shaft 2, a commutator 9 attached to the shaft 2, and the like. The amateur 4 is attached to the shaft 2. The amateur 4 has a core 5, a winding (not shown), and the like. The winding is wound around the core 5. The commutator 9 is provided near one end of the shaft 2. The commutator 9 includes a plurality of commutator pieces 9b arranged in the circumferential direction (around the rotation axis). Each of the plurality of commutator pieces 9b is electrically connected to a winding.

  The frame assembly 1a includes a frame (motor case) 10, a bracket 30, a plate 40, a magnet 50, and the like.

  The frame 10 has a front end, a rear end, a surface (cap) as a front end, and a tubular portion. That is, the frame 10 has a cup shape in which the rear end is an opening. The opening at the rear end (the right end in FIG. 1) of the frame 10 is closed by a plate 40. The armature 4 and the commutator 9 of the armature assembly 1b are housed in a housing constituted by the frame 10 and the plate 40.

  The frame 10 is formed using a magnetic material. As shown in FIG. 2, the frame 10 has a plurality of corners 12 and a plane part 11 between two adjacent corners 12. Specifically, the frame 10 has an outer shape having four flat portions 11 and four corner portions 12. Two planar portions 11 adjacent in the circumferential direction are connected via one corner portion 12. One of the two planar portions 11 adjacent in the circumferential direction is substantially perpendicular to the other. The corner 12 has a rounded shape (R shape). The frame 10 is substantially square in a cross section perpendicular to the shaft 2. The frame 10 is formed in a square shape as a whole. That is, the motor 1 is a small rectangular motor. In the following description, the up-down direction is a direction perpendicular to a pair of plane portions 11 positioned so as to sandwich the shaft 2, and the left-right direction is another pair of planes positioned so as to sandwich the shaft 2. The direction is perpendicular to the part 11.

  Returning to FIG. 1, the bracket 30 is disposed inside the plate 40. The bracket 30 is provided on the frame 10. The bracket 30 has two sets of brush units 20. Each brush unit 20 includes a brush (not shown) that contacts the commutator 9, a terminal portion 28 to which an external current is supplied, and a metal support that electrically connects the brush and the terminal portion 28. (Not shown). The terminal 28 is attached to the bracket 30. The supporter supports the brush on the bracket 30. The support portion is formed of, for example, an elastic member having elasticity, and holds the brush to the bracket in a state where the commutator 9 contacts the outer surface of the brush.

  The shaft 2 passes through the front surface of the frame 10. That is, the front end of the shaft 2 projects from the frame 10 to the outside of the frame 10, and the other portion of the shaft 2 is housed inside the frame 10. A bearing holding portion 10g is provided at the center of the front surface of the frame 10, and a bearing 18 is held by the bearing holding portion 10g. The bearing 19 is held at the center of the plate 40. Behind the bearing 19, a thrust washer 19b is arranged. The shaft 2 is rotatably supported on the frame 10 by two bearings 18, 19 and a thrust washer 19b. The rear end of the shaft 2 may protrude rearward from the plate 40.

  As shown in FIG. 2, in the present embodiment, one annular magnet 50 is provided. In other words, the magnet 50 is formed in a cylindrical shape. The magnet 50 is arranged inside the frame 10. The frame assembly 1a has a sectional structure in which the outer peripheral surface 50a of the magnet 50 is surrounded by the frame 10. The outer peripheral surface of the frame 10 becomes the outer peripheral surface of the motor 1. Note that a plurality of magnets each having a magnetic pole element may be used.

  The frame 10 has a substantially uniform thickness. That is, the inner surface 10b of the frame 10 is formed by connecting a plurality of flat portions formed by the flat portions 11 and a plurality of rounded portions formed by the corner portions 12 and is formed in a square shape.

  The magnet 50 is, for example, a bonded magnet formed using a known rare earth material and a known resin material. The magnet 50 is not limited to a bonded magnet, and may be, for example, a sintered magnet.

  The magnet 50 has a magnetic pole element 61 (N pole 61a, S pole 61b, N pole 61c, S pole 61d). That is, the magnet 50 has the same number of magnetic pole elements 61 as the number of the corners 12 of the motor 1. The magnetic pole elements 61 are arranged so that the polarities are alternated in the circumferential direction. The four magnetic pole elements 61 are arranged on the four corners 12 of the frame 10 such that the magnetic pole elements 61 face each other.

  The magnet 50 has a rounded outer peripheral surface 50 a along the inner surface 10 b of the frame 10 at the corner 12. The magnet 50 has a cylindrical inner peripheral surface 50b. A slight air gap is provided between the inner peripheral surface 50 b of the magnet 50 and the core 5.

  In the present embodiment, the magnet 50 is fixed to the frame 10 using an adhesive 59. That is, the adhesive 59 is provided between the rear end of the magnet 50 and the inner surface 10 b of the frame 10. In the process of assembling the motor 1, the magnet 50 is housed inside the frame 10 from the rear opening of the frame 10. Then, the adhesive 59 is disposed between the rear end of the magnet 50 and the inner surface 10 b of the frame 10, and the magnet 50 is fixed to the frame 10. Thereafter, the armature assembly 1b is mounted on the frame 10, and the bracket 30 and the plate 40 are mounted on the frame 10, whereby the motor 1 is assembled.

  FIG. 3 is a side view showing the shaft 2 and the core 5.

  3, the cross section of the core 5 in a plane passing through the rotation axis is shown without hatching.

  As shown in FIG. 3, the core 5 includes a plurality of cores (an example of a group) 5b. In the present embodiment, the plurality of cores 5b have five cores 5v, 5w, 5x, 5y, and 5z. That is, the core 5 is composed of five cores 5b. The core 5v, the core 5w, the core 5x, the core 5y, and the core 5z are arranged in order from the front along the longitudinal direction of the shaft 2.

  In the present embodiment, the dimension from the front end of the shaft 2 to the front surface of the forefront core 5v is the dimension d1.

  FIG. 4 is a diagram showing the plate 6. FIG. 5 is a side sectional view of the plate 6.

  As shown in FIGS. 4 and 5, each core 5 b has a plurality of plates (an example of a magnetic member) 6. That is, the core 5 has a plurality of plates 6. The plate 6 has, for example, ten teeth 7 protruding in the radial direction. At the center of the plate 6, an inner peripheral portion 6c is formed. The inner peripheral portion 6c is a circular hole. The diameter (dimension d5) of the inner peripheral portion 6c is substantially the same as the diameter of the shaft 2. The outer peripheral portion 6d of the plate 6 faces the magnet 50 fixed to the frame 10 in the radial direction.

  The plate 6 is formed by cutting an electromagnetic steel sheet into a predetermined shape by a press or another processing method. A streak 6z is formed on each of the two front and back surfaces 6b of the plate 6. The streaks 6z are, for example, originally present in the magnetic steel sheet, which is a material of the plate 6, and specifically, marks formed on the surface of the magnetic steel sheet in a rolling process when the magnetic steel sheet is produced. (Roll roll). The streaks 6z are formed on the plate 6 such that a predetermined direction is a longitudinal direction.

  As shown in FIG. 5, a convex portion 7b and a concave portion 7c are formed on a surface 6b of the plate 6. That is, the convex portion 7b is formed on one surface 6b of the plate 6, and the concave portion 7c is formed on the other surface 6b. The convex portion 7b and the concave portion 7c are formed at the same position on the front and back of the plate 6. For example, the convex portion 7b and the concave portion 7c are formed by pressing one portion of the plate 6 with a press.

  As shown in FIG. 4, a combination of the convex portion 7 b and the concave portion 7 c is provided in each tooth 7. That is, each combination of the convex portion 7b and the concave portion 7c is provided in a portion near the outer peripheral edge of the plate 6. One plate 6 is formed with ten protrusions 7b and ten recesses 7c.

  The convex portion 7b can be fitted into the concave portion 7c of another plate 6. When the plates 6 are overlapped as described later, each convex portion 7b of one plate 6 fits into each concave portion 7c of another adjacent plate 6.

  FIG. 6 is a side sectional view of the core 5b.

  As shown in FIG. 6, the core 5b is configured by stacking a plurality of (for example, about 10 to 20) plates 6. In other words, the plurality of plates 6 constituting the core 5 constitute a plurality of groups as the core 5b. The cores 5b are stacked such that the teeth 7 and the like of each plate 6 overlap. That is, the core 5b also has the teeth 7 and the inner peripheral portion 6c.

  The core 5b includes two or more plates 6 that fit together. That is, the adjacent two plates 6 are fitted with each other by the protrusions 7b of each plate 6 being fitted into the recesses 7c of the other adjacent plate 6. In the present embodiment, the core 5b, which is a group of stacked bodies, is configured without using other members such as an adhesive as a whole. The two plates 6 are fitted with each other at ten points, and the core 5b is configured so that the plurality of plates 6 are connected so as not to be easily disassembled.

  In each core 5b, a protruding portion 7b is provided on an end plate 6 having a concave portion 7c fitted to a protruding portion 7b of another adjacent plate 6 among the plurality of stacked plates 6. No, but not limited to this.

  The width dimension of each core 5b in the front-rear direction is a dimension d6.

  In the present embodiment, the plurality of plates 6 constituting one core 5b are stacked such that the longitudinal directions of the respective stripes 6z are substantially the same as each other. Thereby, a plurality of plates 6 formed from the same electromagnetic steel plate can be easily stacked. In addition, it is not limited to this. The plurality of plates 6 forming one core 5b may be stacked so that the longitudinal directions of the respective streaks 6z are different from each other.

  FIG. 7 is a side view of the shaft 2.

  As shown in FIG. 7, in the present embodiment, a plurality of knurls (an example of a fitting portion) 2b are formed on the outer peripheral surface of the shaft 2 so as to be arranged in the longitudinal direction of the shaft 2. In the present embodiment, the plurality of knurls 2b have five sets of knurls 2v, 2w, 2x, 2y, and 2z. Each knurl 2b is convex. The knurl 2 b protrudes radially from the outer peripheral surface of the shaft 2. The knurl 2b is formed by subjecting the shaft 2 to knurling. As shown in FIG. 2, each of the five sets of knurls 2v, 2w, 2x, 2y, 2z is provided on the upper, lower, left and right sides of the outer peripheral surface of the shaft 2. That is, each of the five sets of knurls 2v, 2w, 2x, 2y, and 2z has four convex projections formed by knurling.

  As shown in FIG. 7, in the present embodiment, a plurality of knurls 2b are arranged in a line in the longitudinal direction of the shaft 2. That is, of the five sets of knurls 2v, 2w, 2x, 2y, and 2z, those formed on the right side are substantially aligned on the straight line in the longitudinal direction of the shaft 2.

  In the present embodiment, the dimension from the front end of the shaft 2 to the front end of the foremost knurl 2v is a dimension d2. The length in the front-rear direction of each knurl 2b is a dimension d3. The distance between the knurls 2b adjacent in the front-rear direction is a dimension d4.

  The dimension d4 is substantially the same as the dimension d6. The dimension d3 is smaller than the dimension d6. The dimension d2 is larger than the dimension d1, and the sum of the dimension d1 and the dimension d6 is larger than the sum of the dimension d2 and the dimension d3.

  FIG. 8 is a diagram illustrating a process of attaching the core 5 to the shaft 2.

  As shown in FIG. 8, in the present embodiment, the cores 5 are attached to the shaft 2 by sequentially assembling five cores 5b on the knurled shaft 2 (from step S1 to step S5). (Step S6). Since the knurl 2b is fitted to the inner peripheral portion 6c of each core 5b, the torque applied to the core 5 is reliably transmitted to the shaft 2 when the motor 1 is driven.

  That is, in step S1, the first core 5v from the front is attached to the shaft 2 (for example, press-fitted) so that the inner peripheral portion 6c is fitted into the first knurl 2v from the front. As a result, the knurl 2v is engaged with the inner peripheral portion 6c of the core 5v.

  Next, in step S2, the second core 5w from the front is attached to the shaft 2 such that the inner peripheral portion 6c is fitted into the second knurl 2w from the front. As a result, the knurl 2w is engaged with the inner peripheral portion 6c of the core 5w. At this time, the core 5w is attached to the shaft 2 while being rotated by 72 degrees around the rotation axis with respect to the first core 5v from the front.

  In step S3, the third core 5x from the front is attached to the shaft 2 such that the inner peripheral portion 6c is fitted into the third knurl 2x from the front. Thus, the knurl 2x is engaged with the inner peripheral portion 6c of the core 5x. At this time, the core 5x is attached to the shaft 2 while being rotated 144 degrees around the rotation axis with respect to the first core 5v from the front.

  In step S4, the fourth core 5y from the front is attached to the shaft 2 such that the inner peripheral portion 6c is fitted into the fourth knurl 2y from the front. As a result, the knurl 2y is fitted to the inner peripheral portion 6c of the core 5y. At this time, the core 5y is attached to the shaft 2 while being rotated 216 degrees around the rotation axis with respect to the first core 5v from the front.

  In step S5, the fifth core 5z from the front is attached to the shaft 2 such that the inner peripheral portion 6c is fitted into the fifth knurl 2z from the front. As a result, the knurl 2z is engaged with the inner peripheral portion 6c of the core 5z. At this time, the core 5z is attached to the shaft 2 while being rotated 288 degrees around the rotation axis with respect to the first core 5v from the front.

  Thus, in the present embodiment, one core 5b is fitted to each of the five knurls 2b. That is, it can be said that each of the plurality of knurls 2b is fitted to any one of the inner peripheral portions 6c of the plurality of plates 6. One of the plates 6 of the first core 5v is fitted to the first knurl 2v from the front, and one of the plates 6 of the second core 5w is fitted to the second knurl 2w from the front. Then, any one of the plates 6 of the third core 5x from the front fits into the third knurl 2x from the front, and any one of the plates 6 of the fourth core 5y from the front fits into the fourth knurl 2y from the front. Are fitted, and one of the plates 6 of the fifth core 5z from the front is fitted to the fifth knurl 2z from the front.

  The direction of the streaks 6z of the plate 6 of one core 5b of the plurality of cores 5b is different from the direction of the streaks 6z of the plate 6 of another core 5b. That is, the longitudinal direction of the streaks 6z of the plate 6 of the core 5v, the longitudinal direction of the streaks 6w of the plate 6 of the core 5w, the longitudinal direction of the streaks 6x of the plate 6 of the core 5x, and the plate 6 of the core 5y The longitudinal direction of the streaks 6y and the longitudinal direction of the streaks 6z of the plate 6 of the core 5z are different from each other. In other words, it can be said that the angles of the respective cores 5b around the rotation axis are different from each other.

  As described above, in the present embodiment, the direction (longitudinal direction) of the streaks 6z of the plurality of plates 6 constituting the core 5 is not uniform, but differs for each core 5b (for each group). Therefore, the balance around the rotation axis of the core 5 becomes relatively uniform, and vibration is less likely to be generated when the motor 1 rotates.

  Normally, when the angle around the rotation axis of the plate constituting the core is uniform (the direction of the streaks (rolls) is the same), imbalance tends to occur in the core. This is because there is a common tendency in bias in weight among the plates. When such imbalance occurs, vibration occurs when the motor rotates. In order to reduce unbalance, it is necessary to adjust the balance by putting putty etc. on the amateur while the amateur is configured (plus balance), or adjust the balance by cutting the core (minus balance) However, in either method, the quality of the motor may be impaired or the characteristics of the motor may be affected. For example, when putty is applied, there is a possibility that motor lock may occur due to the putty falling off. In addition, when the core is cut, the characteristics may be deteriorated due to the widening of the gap between the core and the magnet.

  In order to solve such a problem, according to the configuration of the present embodiment, the balance around the rotation axis of the core 5 is easily adjusted in advance. When the amateur 4 is assembled, if the core 5 that most affects the balance is balanced, it is not necessary to perform the above-described balance correction at the stage of assembling the amateur 4. Therefore, it is possible to easily manufacture the motor 1 with low vibration and high quality.

  In particular, in general, in a motor having a long overall length, since the armature is long and the core thickness is large, the degree of unbalance of the arm tends to increase due to the eccentricity of the core and the imbalance of the core balance. Vibration tends to increase. However, according to the configuration of the present embodiment, even when the motor 1 has a relatively long armature 4 that can obtain an output with a relatively high torque, a balance around the rotation axis of the core 5 is maintained. become. Therefore, the motor 1 with low vibration and high quality can be easily manufactured.

  The outer peripheral surface of the shaft 2 is provided with a plurality of knurls 2b arranged in a line in the longitudinal direction of the shaft 2. Since the knurl 2b having a relatively small size can be formed into the shaft 2 by dividing it into a plurality of times, the shaft 2 can be produced with relatively simple equipment. Also in this case, since the plurality of plates 6 are fitted to each other to be grouped together as a core 5b, and each core 5b is fitted to the knurl 2b, the plate 6 The holding strength can be ensured, and the torque applied to the plate 6 can be transmitted to the shaft 2 reliably.

  The plurality of plates 6 are fixed to the shaft 2 as the core 5b and the core 5 by a mechanical coupling structure regardless of a method such as bonding, so that the durability of the motor 1 can be increased.

  In each core 5b, the combination of the convex portion 7b and the concave portion 7c is provided near the tip of the tooth 7. Adjacent plates 6 are fitted in the vicinity of teeth 7 where warpage is likely to occur in each plate 6, so that core 5b in which warpage of each stator 6 is suppressed can be configured.

  Hereinafter, a modified example of the present embodiment will be described. In the following description, the same components as those according to the present embodiment are denoted by the same reference numerals, and description thereof may be omitted.

  [Description of Modification]

  A plurality of knurls arranged in a line in the longitudinal direction of the shaft 2 need not be arranged in a line in the longitudinal direction of the shaft 2.

  FIG. 9 is a side view showing a shaft 102 according to a modification of the present embodiment.

  On the outer peripheral surface of the shaft 102 shown in FIG. 9, two sets of knurls 102 b and 102 c are formed side by side in the longitudinal direction of the shaft 2. Each of the two sets of knurls 102b and 102c has four convex projections formed by knurling. In this modification, the front knurl 102b and the rear knurl 102c are formed so as not to be aligned in the longitudinal direction of the shaft 2 but to be alternately arranged in the circumferential direction. That is, the front knurls 102 b are provided on the upper, lower, left, and right sides of the outer peripheral surface of the shaft 2. On the other hand, the rear knurl 102c is provided on the outer peripheral surface of the shaft 2 at the upper left, the lower left, the lower right, and the upper right.

  FIG. 10 is a side view showing a shaft 102 and a core 5 according to a modification of the present embodiment.

  As shown in FIG. 10, also in the shaft 102, similarly to the above-described embodiment, the cores 5 can be fixed to the shaft 102 by sequentially attaching five cores 5b. In the present modification, the inner peripheral portions 5c of the three cores 5v, 5w, and 5x on the front side are fitted to the front knurl 102b. The three cores 5x, 5y, 5z on the rear side are fitted to the knurl 102c on the rear side.

  In FIG. 10, the dimension from the front end of the shaft 2 to the front surface of the foremost core 5v is indicated by a dimension d1. The width dimension in the front-rear direction of the core 5b is a dimension d6. In FIG. 9, the dimension from the front end of the shaft 2 to the front end of the front knurl 102b is a dimension d2. The length in the front-rear direction of each knurl 102b, 102c is dimension d3. The distance from the front end of the front knurl 102b to the rear end of the rear knurl 102c is a dimension d8.

  In this modification, the dimension d3 is larger than the number obtained by multiplying the dimension d8 by 0.5. That is, in the longitudinal direction of the shaft 2, the front knurl 102b and the rear knurl 102c overlap (the front end of the rear knurl 102c is ahead of the rear end of the front knurl 102b). The dimension d2 is smaller than the dimension d1, and the sum of the dimension d2 and the dimension d8 is greater than the sum of the dimension d6 multiplied by 6 and the dimension d1. That is, the front end of the knurl 102b is ahead of the front end of the foremost core 5v, and the rear end of the knurl 102c is behind the rear end of the last core 5z.

  Even when the motor 1 is configured using the shaft 102 according to the above-described modification, the same effect as described above can be obtained. In the present modification, one of the knurls 102b and 102c is present in the longitudinal direction of the shaft 2 from the front end of the foremost core 5v to the rear end of the last core 5z. Therefore, even if the plurality of plates 6 are not fitted in the core 5b (for example, even if the protrusions 7b and the recesses 7c are not provided in the plates 6), the torque generated in each plate 6 is surely reduced. It is transmitted to the shaft 2 through the knurls 102b and 102c.

  [Others]

  The motor may be configured by partially combining the features of the above-described embodiments and modified examples. In the above embodiments and modifications, some components may not be provided, or some components may be configured in other modes.

  Cores adjacent in the longitudinal direction of the shaft may be fitted to each other.

  Instead of the convex knurl as in the above-described embodiment, for example, a concave fitting portion may be provided. Further, as the convex fitting portion formed on the outer peripheral surface of the shaft, a different one from the one formed by knurling may be provided. The number of such fitting portions is not limited to the above embodiment. The longitudinal dimension of the shaft of each knurl is not limited to that described above.

  The outer peripheral shape of the motor does not have to be square as in the above-described embodiment. For example, the above-described core may be employed in a small motor having a so-called oval (oval type in which two right and left arcs are connected by two straight lines), or a small motor having a round cross section. May employ the above-described core. When the outer peripheral shape of the motor has an oval cross section, two magnets having an arc-shaped planar shape are fixed to the frame, and when the outer peripheral shape of the motor has a round cross section, a circular planar shape is formed. The fixed magnet is fixed to the frame. Further, the number of poles and the number of slots of the motor are not limited to those described above.

  In the above-described embodiment, a plurality of convex knurls arranged in the longitudinal direction of the shaft are formed on the outer peripheral surface of the shaft, and then the core is pressed into the shaft to form an amateur assembly. The manufacturing process of the assembly is not limited to this. For example, among a plurality of convex knurls arranged in the longitudinal direction of the shaft, a first convex knurl is formed on the outer peripheral surface of the shaft, and a first core is fitted to the first convex knurl, Thereafter, the motor may be formed by repeatedly forming the second convex knurl on the outer peripheral surface of the shaft and fitting the second core to the second convex knurl. That is, the motor may be formed by repeating the step of fitting the core to a knurl formed by forming one of a plurality of convex knurls arranged in the longitudinal direction.

  The motor configured as described above can be used for various applications. For example, it may be used for an electronic device, or used for an application mounted on various vehicles.

  The above embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Motor 1a Frame assembly 1b Amateur assembly 2,102 Shaft 2b (2v, 2w, 2x, 2y, 2z), 102b, 102c Knurl (an example of a fitting part)
4 amateur 5 core 5b (5v, 5w, 5x, 5y, 5z) core (an example of a group)
6 plate (example of magnetic member)
6b (plate) surface 6c Inner circumference 6z Streak 7 Teeth 7b Concave part 7c Convex part 10 Frame 20 Brush unit 30 Bracket 40 Plate 50 Magnet

Claims (7)

Shaft and
A plurality of magnetic members having an inner peripheral portion,
An outer peripheral surface of the shaft is provided with a plurality of concave or convex fitting portions that are arranged in a line in the longitudinal direction of the shaft,
The motor, wherein the plurality of fitting portions are fitted with any one of the inner peripheral portions of the plurality of magnetic members. Each of the plurality of magnetic members has an outer peripheral portion and a surface surrounded by the outer peripheral portion,
A plurality of stripes are formed on each surface of the plurality of magnetic members,
A first magnetic member of the plurality of magnetic members is fitted to a first fitting portion of the plurality of fitting portions,
A second magnetic member of the plurality of magnetic members is fitted to a second fitting part of the plurality of fitting parts,
2. The motor according to claim 1, wherein the direction of the streaks of the first magnetic member is different from the direction of the streaks of the second magnetic member. 3. A third magnetic member of the plurality of magnetic members is fitted to a third fitting portion of the plurality of fitting portions,
The direction of the streaks of the third magnetic member is different from the direction of the streaks of the first magnetic member, and is different from the direction of the streaks of the second magnetic member. Motor.   The motor according to any one of claims 1 to 3, wherein the plurality of fitting portions are arranged in a line in a longitudinal direction of the shaft. The plurality of magnetic members are constituted by a plurality of groups,
The motor according to claim 1, wherein each of the plurality of groups includes two or more magnetic members that fit together.   The two or more magnetic members fitted to each other have a magnetic member provided with a convex portion on the surface of the magnetic member and a magnetic member provided with a concave portion fitted with the convex portion on the surface of the magnetic member. The motor according to claim 5, comprising a member. A plurality of stripes are formed on each surface of the plurality of magnetic members,
The plurality of magnetic members are constituted by a plurality of groups,
2. The motor according to claim 1, wherein the direction of the streaks of a first group of magnetic members of the plurality of groups is different from the direction of streaks of a second group of magnetic members of the plurality of groups. 3.

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