JP2000324729A - Core sheet and armature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide core sheets which can improve winding space factor in a slot and can reduce the length of a coil end. SOLUTION: A tooth 13 has a tooth part 14 and a winding holding part 15, which protrudes from the tip of the tooth part 14 toward both sides so as to have a T-shape. The winding holding part 15 has a tip surface 15a, which has a circular arc shape whose center is the center of a core sheet 11 and base end surfaces 15b perpendicular to the tooth part 14. The winding parts 16 on both the sides of the tooth part 14 have recessed shapes, extending in directions perpendicular to the tooth part 14 having uniform widths. Corner parts 16a of the winding parts 16 on the root parts of the tooth part 14 have circular arc shapes, whose radii of curvature are the same as or slightly smaller than the radius of the winding 18 wound in the winding parts 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature of a motor, and more particularly, to a core sheet constituting a core of the armature.

[0002]

2. Description of the Related Art Heretofore, in a DC motor, a distributed winding has been generally adopted as a winding method for an armature. In the case of winding by this winding method, since the windings overlap each other, the length of the coil end (the length from one end to the end in the axial direction of the rotating shaft) is correspondingly long, and the internal space of the armature is large. Therefore, there is a problem in miniaturizing the motor.

Therefore, for example, Japanese Patent Application Laid-Open No. Sho 59-165947.
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. H11-209, a technique of concentrated winding of one tooth (or one slot) has been proposed. According to such a technique, since the windings such as the distributed winding do not overlap, the size of the armature (that is, the motor) can be reduced to some extent.

The core sheet constituting the core of the conventional armature is formed in a shape as shown in FIG. More specifically, the conventional core sheet 51 is formed in a disk shape as shown in FIG. A central portion 52 of the core sheet 51 is provided with a through hole 52a through which a rotating shaft of a motor or the like penetrates. Further, a plurality of teeth 53 are formed to extend radially from the outer periphery of the central portion 52 at equal angular intervals.

As shown in FIGS. 3 and 4, each of the teeth 53 includes a tooth portion 54 and a winding holding portion 55 extending from the tip of the tooth portion 54 to both sides. Is formed. The winding holding section 55 includes the core sheet 5.
1 is formed in an arc shape with the center as the center. A space surrounded by the central portion 52, the winding holding portion 55, and the teeth portion 54 on both sides of the teeth portion 54 is a winding portion 56 of the teeth 53. In other words, the winding portions 56 of the adjacent teeth 53 are the slots 5 of the core sheet 51.
7 are formed.

Further, since the central portion 52 of the core sheet 51 is formed in a circular shape and the winding holding portion 55 is formed in an arc shape, the angle θ1 formed between the central portion 52 and the teeth portion 54 is as shown in FIG. The angle θ2 between the winding holding portion 55 and the teeth portion 54 becomes an obtuse angle. Then, the respective corners, that is, the corners 56a of the roots of the teeth 54 of the winding part 56,
The arc 56b is processed into an arc, and the arc radii of the corners 56a and 56b are larger than the radius of the winding 58 wound around the winding section 56, respectively.

[0007]

Generally, a movable winding machine is used for winding a coil around an armature. When the winding 58 is wound on the winding portion 56 of each tooth 53 formed as described above by a movable winding machine, the shape of the winding portion 56 changes in an arc shape. Numeral 58 is wound along the arc-shaped winding portion 56 to cause uneven distribution.

Further, as shown in FIG. 4, the positions of the windings 58 are not determined at the corners 56a and 56b of the winding portion 56.
It becomes difficult to arrange the windings 58 in an aligned manner. This is because the space factor of the winding in the slot 57 is reduced and the length L of the coil end of the armature wound on the core 50 composed of the plurality of core sheets 51 is increased as shown in FIG. This leads to a problem in further downsizing the armature (that is, the motor).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve the space factor of a coil in a slot and to reduce the length of a coil end. An object of the present invention is to provide a core sheet that can be manufactured and an armature that can be downsized.

[0010]

In order to solve the above problem, the invention according to claim 1 comprises a plurality of teeth extending radially and equiangularly from a central portion, and a plurality of teeth extending from adjacent teeth. In a core sheet in which a plurality of slots each including a winding portion around which a winding is wound are formed, the winding portions forming the slots are formed so as to extend at a uniform width in a direction perpendicular to the teeth. Is the gist.

According to a second aspect of the present invention, in the core sheet according to the first aspect, the corner of the tooth root of the winding portion is formed in an arc shape, and the radius of the arc of the corner portion is determined by the winding portion. The gist is that the radius is set to be equal to or smaller than the radius of the winding to be wound.

[0012] The invention described in claim 3 is the invention according to claim 1 or 2.
The present invention has a gist including a core configured by overlapping a plurality of core sheets described in (1). According to the first aspect of the present invention, when the winding is wound around the tooth winding portion by the movable winding machine, the winding is not unevenly distributed and is uniformly distributed on the tooth winding portion. Can be wound around. As a result, the space factor of the winding in the slot can be improved, and the length of the coil end can be reduced.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention described in (1), the position of the winding at the corner of the winding portion is securely determined without uneven distribution, and the winding can be wound in an aligned manner. As a result, the space factor of the winding in the slot can be improved, and the length of the coil end can be reduced.

According to the invention described in claim 3, according to claim 1 of the present invention,
In addition to the effects of the inventions described in (1) and (2), the space factor of the winding in the slot can be improved, and the length of the coil end can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a core sheet constituting a core of an armature (rotor) of a DC motor will be described below with reference to FIGS.

FIG. 1 is a front view of the core sheet of the present embodiment. FIG. 2 is an enlarged view of a main part of the core sheet.
As shown in FIG. 1, the core sheet 11 is formed in a disk shape. The central portion 12 of the core sheet 11 is formed to be a regular polygon having the same number of sides 12a as the number (M) of the teeth 13 described later formed on the core sheet 11. Each corner formed by the intersection of the side 12a and the side 12a is formed in an arc shape.

At the center of the central portion 12, a through hole 12b through which a rotating shaft of a motor or the like is inserted is provided. The through hole 12b is formed in a gear shape. Further, on each side 12a of the central portion 12, a tooth 13 is formed to extend from the center of each side 12a perpendicularly to each side 12a. That is, a plurality (M) of the teeth 13 are formed to extend radially from each side 12 a at equal angular intervals from the center of the core sheet 11. In this embodiment,
The central portion 12 is formed in a regular pentagon, and five teeth 13 are formed.

As shown in FIGS. 1 and 2, each of the teeth 13 has a tooth portion 14 and a winding holding portion 15 extending from the tip of the tooth portion 14 to both sides. Is formed.

Both side surfaces of the tooth portion 14 are formed on the side 12a.
Perpendicular to The winding holding part 15 is provided on the core sheet 1.
1 has an arc-shaped distal end surface 15a centered on the center and a base end surface 15b perpendicular to the teeth portion 14 (that is, parallel to the side 12a). Projections 15c are formed at both ends of the base end face 15b.

Then, on both sides of the teeth portion 14,
The space surrounded by the side 12a, the winding holding portion 15, and the teeth portion 14 is a winding portion 16 of the teeth 13. That is, the winding portion 16 of the tooth 13 is formed in a concave portion extending at a uniform width in a direction perpendicular to the tooth portion 14.
The winding portions 16 of the adjacent teeth 13 form the slots 17 of the core sheet 11.

Since the side 12a and the base end face 15b are orthogonal to the teeth portion 14, respectively, the angle between the side 12a and the tooth portion 14 and the base end face 1 as shown in FIG.
The angle between the teeth 5b and the teeth portion 14 is a right angle. And
Each of the right-angled corners (that is, the corners of the roots of the teeth portion 14 of the winding portion 16) 16a is formed by arc processing. The arc radii of the corners 16a are set to be equal to or slightly smaller than the radius of the winding 18 wound around the winding portion 16.

Next, the features of this embodiment configured as described above will be described. Core sheet 11 of the present embodiment
According to this, the following features can be obtained.

(1) In this embodiment, the wound portion 16 of the teeth 13 is formed in a concave portion extending at a uniform width in a direction perpendicular to the teeth portion 14. Therefore, when the winding 18 is wound around the winding part 16 of the tooth 13 by the movable winding machine, the winding 18 is not unevenly distributed and the winding part 16 of the tooth 13 is
Can be wound uniformly.

As a result, the space factor of the winding in the slot 17 can be improved, and the length of the coil end can be reduced. (2) In the present embodiment, the corner 16a of the root of the tooth portion 14 of the winding portion 16 is formed into an arc. The radius of the arc of the corner portion 16a is set to be the same as or slightly smaller than the radius of the winding 18 wound around the winding portion 16.

Therefore, as shown in FIG. 2, the positions of the windings 18 are securely determined without uneven distribution at the corners 16a of the winding portion 16, and the windings 18 can be wound in an aligned manner. As a result, the space factor of the winding in the slot 17 can be improved, and the length of the coil end can be reduced.

The embodiment of the present invention may be modified as follows. In the above embodiment, the present invention is applied to a core sheet having five teeth (that is, five slots), but may be applied to a core sheet having five or more teeth (that is, slots). In this case, effects similar to the effects described in the features (1) and (2) of the above embodiment can be obtained.

In the above embodiment, the core sheet constituting the core of the armature (rotor) of the DC motor has been embodied. However, the core sheet constituting the core of the armature (rotor) of the permanent magnet motor in general has been embodied. May be implemented. In this case, effects similar to the effects described in the features (1) and (2) of the above embodiment can be obtained.

[0028]

As described above, according to the first and second aspects of the present invention, the space factor of the winding in the slot can be improved and the length of the coil end can be reduced. be able to.

According to the invention described in claim 3, according to claim 1
In addition to the effects of the inventions described in (2) and (3), the size of the armature can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a core sheet of the present invention.

FIG. 2 is an enlarged view of a main part of the core sheet.

FIG. 3 is a front view of a conventional core sheet.

FIG. 4 is an enlarged view of a main part of a conventional core sheet.

FIG. 5 is an explanatory view showing a coil end of the armature.

[Explanation of symbols]

11 core sheet, 12 central part, 13 teeth, 1
6 ... winding part, 16a ... corner of winding part, 17 ... slot,
18 ... winding.

Claims (3)

[Claims] 1. A winding device comprising a plurality of teeth (13) extending radially and equiangularly from a central portion (12), wherein a winding (18) is wound between adjacent teeth (13). In the core sheet having a plurality of slots (17) formed of the portions (16), the winding portion (16) constituting the slots (17) is formed so as to extend with a uniform width in a direction perpendicular to the teeth (13). A core sheet characterized by being formed. 2. The core sheet according to claim 1, wherein a corner (1) of a root of a tooth (13) of the winding portion (16) is provided.
6a) is formed in an arc shape, and the radius of the arc of the corner portion (16a) is set to be equal to or smaller than the radius of the winding (18) wound around the winding portion (16). A core sheet characterized in that: 3. An armature comprising a core constituted by overlapping a plurality of core sheets (11) according to claim 1 or 2.