JP7191568B2 - motor - Google Patents

Description

TECHNICAL FIELD 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.

Some motors have a structure in which a stator having an inner circumference is attached to a shaft. As for a connection structure between a shaft and a stator used in such a motor, there is known one in which the surface of the shaft is knurled, as described in Patent Document 1 below.

JP-A-58-039250

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor in which vibration is less likely to occur during rotation.

According to one aspect of the present invention to achieve the above object, a motor includes a shaft and a core, the core includes a plurality of groups composed of a plurality of magnetic members that fit together, and a plurality of magnetic members. The magnetic member has an inner peripheral portion, and the outer peripheral surface of the shaft is provided with a plurality of concave or convex fitting portions arranged at predetermined intervals in the longitudinal direction of the shaft. , the length of the fitting portion is smaller than the length of the group, and among the plurality of magnetic members constituting the plurality of groups, the inner peripheral portions of some of the magnetic members are fitted with the plurality of fitting portions, and the inner peripheral portions of the other magnetic members The inner peripheral portion of the member faces a portion of the outer peripheral surface of the shaft between the plurality of fittings .

Preferably, each of the plurality of magnetic members has an outer peripheral portion and a surface surrounded by the outer peripheral portion, and each of the surfaces of the plurality of magnetic members is formed with a plurality of streaks so that the plurality of fitting portions are aligned. Of the plurality of magnetic members, the first magnetic member is fitted into the first fitting portion, and the second magnetic member of the plurality of magnetic members is fitted into the second fitting portion of the plurality of fitting portions. The members are fitted, and 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 into the third fitting portion of the plurality of fitting portions, and the direction of the streaks of the third magnetic member is aligned with the direction of the first magnetic member. It is different from the direction of the streaks of the member and is different from the direction of the streaks of the second magnetic member.

Preferably, the plurality of magnetic members that fit together include a magnetic member provided with a convex portion and a magnetic member provided with a concave portion that engages with the convex portion.

Preferably, a plurality of stripes are formed on each surface of the plurality of magnetic members, the plurality of magnetic members are configured in a plurality of groups, and the first group of the magnetic members has the plurality of magnetic members. 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 in which vibration is less likely to occur during rotation.

It is a sectional view showing a motor in one of the embodiments of the present invention. FIG. 2 is a diagram schematically showing a cross section taken along line AA of FIG. 1; FIG. 4 is a side view showing a shaft and core; FIG. 3 shows a plate; Fig. 3 is a side cross-sectional view of the plate; FIG. 4 is a side cross-sectional view of the core; Fig. 3 is a side view of the shaft; It is a figure explaining the process of attaching a core to a shaft. FIG. 11 is a side view showing a shaft according to a modified example of the present embodiment; FIG. 5 is a side view showing a shaft and a core according to a modified example of the present embodiment;

A motor according to one embodiment of the present invention will be described below.

In the following description, the direction parallel to the shaft of the motor is sometimes referred to as the rotation axis direction. Also, the direction of the rotation axis is sometimes referred to as the front-rear direction (the direction in which the bracket is provided as viewed from the frame of the motor is the rearward direction). In addition, a specific direction (to be described later) among directions perpendicular to the rotating shaft of the motor (radial direction) may be referred to as the vertical direction, and directions perpendicular to the front-rear direction and the vertical direction may be referred to as the left-right direction. . Here, "back and forth", "up and down", "left and right", etc. are used for the sake of convenience when focusing only on the motor, and the direction in the equipment in which this motor is mounted and the direction in which this motor is used The posture is not limited at all.

[Embodiment]

FIG. 1 is a sectional view showing a motor in one embodiment of the 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 the cross-section shown as line BB in FIG. Note that some of the constituent members are shown schematically. In the following figures, an arrow A1 indicates the rotation axis direction, that is, the front-rear direction. An arrow A2 indicates the left-right direction (the left is the left in FIG. 2). An arrow A3 indicates the up-down direction (up is the up direction in FIG. 2).

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

The armature 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. Armature 4 is attached to shaft 2 . The armature 4 has a core 5 and windings (not shown). A winding is wound on the core 5 . A commutator 9 is provided near one end of the shaft 2 . The commutator 9 includes a plurality of commutator segments 9b arranged in the circumferential direction (around the rotation axis). Each of the commutator segments 9b is electrically connected to the winding.

The frame assembly 1a includes a frame (motor case) 10, brackets 30, plates 40, magnets 50, and the like.

The frame 10 has a front end, a rear end, a face (cap) as the front end, and a cylindrical portion. That is, the frame 10 has a cup shape with an opening at the rear end. A plate 40 covers the opening at the rear end of the frame 10 (the right end in FIG. 1). The armature 4 of the armature assembly 1b, the commutator 9, and the like are accommodated in the housing composed of the frame 10 and the plate 40. As shown in FIG.

Frame 10 is formed using a magnetic material. As shown in FIG. 2, the frame 10 has a plurality of corners 12 and a planar portion 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 flat portions 11 adjacent in the circumferential direction are connected via one corner portion 12 . One of the two circumferentially adjacent planar portions 11 is substantially perpendicular to the other. The corner portion 12 has a rounded shape (R shape). The frame 10 has a substantially square cross section perpendicular to the shaft 2 . The frame 10 is formed in a rectangular shape as a whole. That is, the motor 1 is a rectangular small motor. In the following description, the vertical direction is the direction perpendicular to the pair of plane portions 11 positioned to sandwich the shaft 2, and the horizontal direction is the other pair of plane portions positioned to sandwich the shaft 2. This is the direction perpendicular to the portion 11 .

Returning to FIG. 1, the bracket 30 is arranged inside the plate 40 . Bracket 30 is provided on frame 10 . 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). Terminal portion 28 is attached to bracket 30 . The support supports the brush to bracket 30 . The support portion is formed of, for example, an elastic member having elasticity, and holds the brush to the bracket while the commutator 9 is in contact with 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 protrudes from the frame 10 to the outside of the frame 10 , and the rest of the shaft 2 is housed inside the frame 10 . A bearing holding portion 10g is provided in the central portion of the front surface of the frame 10, and a bearing 18 is held by the bearing holding portion 10g. A bearing 19 is held in the central portion of the plate 40 . A thrust washer 19 b is arranged behind the bearing 19 . The shaft 2 is rotatably supported with respect to the frame 10 by two bearings 18, 19 and a thrust washer 19b. The rear end of the shaft 2 may protrude rearward beyond the plate 40 .

As shown in FIG. 2, one annular magnet 50 is provided in this embodiment. 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 cross-sectional structure in which the outer peripheral surface 50a of the magnet 50 is surrounded by the frame 10. As shown in FIG. The outer peripheral surface of the frame 10 is the outer peripheral surface of the motor 1 . 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 in a rectangular shape by connecting a plurality of flat portions formed by the plane portions 11 and rounded portions formed by the corner portions 12 .

The magnet 50 is a bond magnet made of, for example, a known rare earth material and a known resin material. Note that the magnet 50 is not limited to a bond magnet, and may be, for example, a sintered magnet.

The magnet 50 has magnetic pole elements 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 corners 12 of the motor 1 . The magnetic pole elements 61 are arranged so that their polarities alternate in the circumferential direction. The four magnetic pole elements 61 are arranged at the four corners 12 of the frame 10 so 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 also 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 this embodiment, magnet 50 is fixed to frame 10 using adhesive 59 . That is, there is an adhesive 59 between the rear end of the magnet 50 and the inner surface 10b of the frame 10. As shown in FIG. In the assembly process of the motor 1 , the magnet 50 is housed inside the frame 10 through an opening on the rear side of the frame 10 . An adhesive 59 is placed between the rear end of the magnet 50 and the inner surface 10 b of the frame 10 to fix the magnet 50 to the frame 10 . After that, the motor 1 is assembled by attaching the armature assembly 1b to the frame 10 and attaching the bracket 30 and the plate 40 to the frame 10 .

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

In FIG. 3, the cross section of the core 5 on the plane passing through the axis of rotation is shown without hatching.

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

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

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

As shown in FIGS. 4 and 5, each core 5b has a plurality of plates (an example of magnetic members) 6. FIG. That is, the core 5 has multiple plates 6 . The plate 6 has, for example, ten radially projecting teeth 7 . An inner peripheral portion 6c is formed in the central portion of the plate 6. As shown in FIG. 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. As shown in FIG. 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 pressing or other processing method. A stripe 6z is formed on each of the front and back surfaces 6b of the plate 6. As shown in FIG. The streaks 6z are, for example, originally present in the magnetic steel sheet that is the material of the plate 6, and specifically, are marks formed on the surface of the magnetic steel sheet in the rolling process or the like when the magnetic steel sheet is produced. (roll eyes). The stripes 6z are formed on the plate 6 such that a predetermined direction is the longitudinal direction.

As shown in FIG. 5, the surface 6b of the plate 6 is formed with a convex portion 7b and a concave portion 7c. That is, a convex portion 7b is formed on one surface 6b of the plate 6, and a 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 sides of the plate 6. As shown in FIG. 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, each tooth 7 is provided with a combination of a convex portion 7b and a concave portion 7c. That is, each combination of the convex portion 7b and the concave portion 7c is provided in the vicinity of the outer peripheral edge of the plate 6. As shown in FIG. 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. As shown in FIG. When the plates 6 are superimposed as described later, each convex portion 7b of one plate 6 fits into each concave portion 7c of the other adjacent plate 6. As shown in FIG.

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 forming the core 5 form a plurality of groups as the core 5b. The cores 5b are stacked such that the teeth 7 and the like of the respective plates 6 are stacked. That is, the core 5b also has teeth 7 and an inner peripheral portion 6c.

The core 5b includes two or more plates 6 that fit together. That is, the two adjacent plates 6 are fitted to each other by fitting the protrusions 7b of each plate 6 into the recesses 7c of the other adjacent plate 6 . In this embodiment, the core 5b, which is a lump of laminate, is constructed without using any other member such as an adhesive as a whole. The two plates 6 are fitted to each other at 10 points, and the core 5b is configured by joining a plurality of plates 6 so as not to be easily disassembled.

In each core 5b, among the plurality of stacked plates 6, the end plate 6 having the recess 7c that fits the protrusion 7b of the other adjacent plate 6 is provided with the protrusion 7b. No, but not limited to.

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

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

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

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 aligned in the longitudinal direction of the shaft 2. As shown in FIG. In this embodiment, the plurality of knurls 2b has five sets of knurls 2v, 2w, 2x, 2y, 2z. Each knurl 2b is convex. The knurl 2b radially protrudes from the outer peripheral surface of the shaft 2 . The knurl 2b is formed by knurling the shaft 2. As shown in FIG. As shown in FIG. 2, five sets of knurls 2v, 2w, 2x, 2y, and 2z are provided on the upper, lower, left, and right sides of the outer peripheral surface of the shaft 2, respectively. 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 this embodiment, a plurality of knurls 2b are arranged in a row in the longitudinal direction of shaft 2. As shown in FIG. That is, among the five sets of knurls 2v, 2w, 2x, 2y, and 2z, the knurls formed on the respective right sides are arranged substantially in a straight line in the longitudinal direction of the shaft 2. As shown in FIG.

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

Dimension d4 is substantially the same as dimension d6. Dimension d3 is smaller than dimension d6. Also, dimension d2 is greater than dimension d1, and the sum of dimension d1 and dimension d6 is greater than the sum of dimension d2 and dimension d3.

8A and 8B are diagrams for explaining the process of attaching the core 5 to the shaft 2. FIG.

As shown in FIG. 8, in the present embodiment, five cores 5b are sequentially assembled to the knurled shaft 2 (steps S1 to S5) to attach the cores 5 to the shaft 2. (step S6). Since the knurls 2b are fitted to the inner peripheral portions 6c of the respective cores 5b, the torque applied to the cores 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 (for example, press-fitted) to the shaft 2 so that the inner peripheral portion 6c is fitted into the first knurl 2v from the front. As a result, the knurl 2v is fitted with the inner peripheral portion 6c of the core 5v.

Next, in step S2, the second front core 5w is attached to the shaft 2 so that the inner peripheral portion 6c is fitted into the second front knurl 2w. As a result, the knurl 2w is fitted 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 72 degrees about 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 so that the inner peripheral portion 6c is fitted into the third knurl 2x from the front. As a result, the knurl 2x is fitted with the inner peripheral portion 6c of the core 5x. At this time, the core 5x is attached to the shaft 2 in a state rotated by 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 so that the inner peripheral portion 6c is fitted into the fourth knurl 2y from the front. As a result, the knurl 2y is fitted with the inner peripheral portion 6c of the core 5y. At this time, the core 5y is attached to the shaft 2 in a state rotated by 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 so that the inner peripheral portion 6c is fitted to the fifth knurl 2z from the front. As a result, the knurl 2z is fitted 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 this 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 one of the inner peripheral portions 6c of the plurality of plates 6. As shown in FIG. One of the plates 6 of the first core 5v from the front is fitted to the first knurl 2v from the front, and one of the plates 6 of the second core 5w from the front is fitted to the second knurl 2w from the front. Either plate 6 of the third core 5x from the front is fitted to the third knurl 2x from the front, and either plate 6 of the fourth core 5y from the front is fitted to the fourth knurl 2y from the front. is 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 among the plurality of cores 5b is different from the direction of the streaks 6z of the plates 6 of the other cores 5b. That is, the longitudinal direction of the muscle 6z of the plate 6 of the core 5v, the longitudinal direction of the muscle 6w of the plate 6 of the core 5w, the longitudinal direction of the muscle 6x of the plate 6 of the core 5x, and the longitudinal direction of the plate 6 of the core 5y. The longitudinal direction of the muscle 6y and the longitudinal direction of the muscle 6z of the plate 6 of the core 5z are different from each other. In other words, it can be said that the angles around the rotation axis of each core 5b are different from each other.

Thus, in the present embodiment, the orientation (longitudinal direction) of the stripes 6z of the plurality of plates 6 forming the core 5 is not uniform, but differs for each core 5b (for each group). Therefore, the balance of the core 5 around the rotation axis becomes relatively uniform, and vibration is less likely to occur when the motor 1 rotates.

Normally, if the angles around the rotation axis of the plates constituting the core are uniform (the directions of the stripes (roll grains) are the same), the core tends to become unbalanced. This is because each plate has a common tendency of biased weight. Such imbalance causes vibration during rotation of the motor. In order to reduce the imbalance, it is necessary to adjust the balance by applying putty etc. to the amateur (plus balance), or by scraping the core to adjust the balance (negative balance). However, both approaches can compromise motor quality or affect motor characteristics. For example, applying putty can cause motor lockup due to falling putty. Also, if the core is shaved, the gap between the core and the magnet widens, possibly deteriorating the characteristics.

With respect to such a problem, with the configuration of the present embodiment, the balance around the rotation axis of the core 5 can be easily adjusted in advance. When the armature 4 is assembled, if the core 5, which most affects the balance, is well balanced, there is no need to correct the balance as described above when the armature 4 is assembled. Therefore, the motor 1 with little vibration and high quality can be easily manufactured.

In general, in a motor with a long overall length, the armature is long and the thickness of the core stack is large. Vibration tends to increase. However, with the configuration of the present embodiment, even in the case of the motor 1 having the armature 4 having a relatively long overall length, which can obtain a relatively high torque output, the core 5 is in a state of being balanced around the rotation axis. become. Therefore, the motor 1 with little vibration and high quality can be easily manufactured.

A plurality of knurls 2 b are provided on the outer peripheral surface of the shaft 2 so as to be aligned with each other in the longitudinal direction of the shaft 2 . Since the knurl 2b having a relatively small size can be formed in the shaft 2 by dividing it into a plurality of times, the shaft 2 can be produced with relatively simple equipment. Further, even in this case, the plurality of plates 6 are fitted to each other to form a core 5b, and each core 5b is fitted to the knurl 2b. Holding strength can be secured, and torque applied to the plate 6 can be reliably transmitted to the shaft 2 .

Since the plurality of plates 6 are fixed to the shaft 2 as the cores 5b and 5 by a mechanical connection structure without using a method such as adhesion, the durability of the motor 1 can be increased.

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

Modifications of this embodiment will be described below. In the following description, the same reference numerals are given to the same configurations as the configurations according to the present embodiment, and the description thereof may be omitted.

[Explanation of modification]

A plurality of knurls aligned in the longitudinal direction of the shaft 2 may not be aligned in a line in the longitudinal direction of the shaft 2 .

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

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

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

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

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

In this modification, the dimension d3 is larger than the dimension d8 multiplied by 0.5. That is, the front knurl 102b and the rear knurl 102c overlap in the longitudinal direction of the shaft 2 (the front end of the rear knurl 102c is ahead of the rear end of the front knurl 102b). Also, 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 front knurl 102b is ahead of the front end of the foremost core 5v, and the rear end of the rear knurl 102c is behind the rear end of the rearmost core 5z.

Even when the motor 1 is configured using the shaft 102 according to the modified example as described above, the same effect as described above can be obtained. In this modification, either knurl 102b or 102c exists in the longitudinal direction of the shaft 2 from the front end of the front core 5v to the rear end of the rearmost core 5z. Therefore, even if the plurality of plates 6 are not fitted to each other within the core 5b (for example, even if the plate 6 is not provided with the convex portion 7b or the concave portion 7c), the torque generated in each plate 6 can be reliably transferred. It is transmitted to the shaft 2 through knurls 102b and 102c.

[others]

A motor may be configured by partially combining the features of the above embodiments and modifications. In the embodiments and modifications described above, some components may be omitted or some components may be configured in other manners.

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

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

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

In the above-described embodiment, the armature assembly is constructed by forming a plurality of convex knurls aligned in the longitudinal direction of the shaft on the outer peripheral surface of the shaft and then press-fitting the core into the shaft. The assembly manufacturing process 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, a first core is fitted to the first convex knurl, After that, a second convex knurl may be formed on the outer peripheral surface of the shaft, and the second core may be fitted into the second convex knurl, and the motor may be formed by repeating this process. That is, the motor may be formed by repeating the process of forming one of a plurality of convex knurls arranged in the longitudinal direction and fitting the core to the formed knurl.

The motor configured as described above can be used for various purposes. For example, it may be used in electronic equipment, or may be used in applications mounted on various vehicles.

The above-described embodiments should be considered as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

Reference Signs List 1 motor 1a frame assembly 1b armature assembly 2, 102 shaft 2b (2v, 2w, 2x, 2y, 2z), 102b, 102c knurl (an example of fitting portion)
4 amateur 5 core 5b (5v, 5w, 5x, 5y, 5z) core (an example of a group)
6 plate (an example of a magnetic member)
6b Surface 6c Inner Periphery 6z Line 7 Teeth 7b Concave 7c Convex 10 Frame 20 Brush Unit 30 Bracket 40 Plate 50 Magnet

Claims (5)

a shaft;
comprising a core and
The core comprises a plurality of groups composed of a plurality of magnetic members that fit together,
The plurality of magnetic members have an inner periphery,
A plurality of concave or convex fitting portions are provided at predetermined intervals on the outer peripheral surface of the shaft, and are arranged side by side in the longitudinal direction of the shaft;
In the longitudinal direction of the shaft, the length of the fitting portion is smaller than the length of the group, and among the plurality of magnetic members forming the plurality of groups, the inner peripheral portions of some of the magnetic members are the plurality of fitting portions. The motor, wherein the inner peripheral portion of another magnetic member is fitted with the mating portion and faces a portion of the outer peripheral surface of the shaft between the plurality of mating portions. each of the plurality of magnetic members has an outer peripheral portion and a surface surrounded by the outer peripheral portion;
A plurality of streaks are formed on each surface of the plurality of magnetic members,
a first magnetic member of the plurality of magnetic members is fitted into a first fitting portion of the plurality of fitting portions;
a second magnetic member of the plurality of magnetic members is fitted into a second fitting portion of the plurality of fitting portions;
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. a third magnetic member of the plurality of magnetic members is fitted into a third fitting portion of the plurality of fitting portions;
3. The method according to claim 2 , wherein 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. 2. The motor according to claim 1 , wherein the plurality of magnetic members that fit together include a magnetic member provided with a convex portion and a magnetic member provided with a concave portion that engages with the convex portion. A plurality of streaks are formed on each surface of the plurality of magnetic members,
The plurality of magnetic members are configured in a plurality of groups,
2. The motor according to claim 1 , wherein the direction of the ridges of the magnetic members of the first group among the plurality of groups is different from the direction of the ridges of the magnetic members of the second group of the plurality of groups.

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