JP7344687B2

JP7344687B2 - stepper motor

Info

Publication number: JP7344687B2
Application number: JP2019128397A
Authority: JP
Inventors: 伸明田中; 一隆小林
Original assignee: NIDEC INSTRUMENTS CORPORATION
Current assignee: NIDEC INSTRUMENTS CORPORATION
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2023-09-14
Anticipated expiration: 2039-07-10
Also published as: JP2021016215A

Description

本発明は、複数のステータ組がモータ軸線方向に配置されたステッピングモータに関するものである。 The present invention relates to a stepping motor in which a plurality of stator sets are arranged in the motor axis direction.

ステッピングモータは、回転軸の外周面に固定された永久磁石を備えるロータと、永久磁石の外周面に対向するように配置されたステータとを備える。ステータは、Ａ相およびＢ相の２つのステータ組がモータ軸線方向で隣り合うように配置されている。一方、ステッピングモータを細径化した場合でも大きなトルクを確保可能な構造として、ステータ組をモータ軸線方向に４つ以上配置した構造が提案されている（特許文献１参照）。特許文献１では、複数のステータ組の周りに円筒状のケースを配置してステータを構成している。 A stepping motor includes a rotor that includes a permanent magnet fixed to an outer circumferential surface of a rotating shaft, and a stator that is arranged to face the outer circumferential surface of the permanent magnet. The stator is arranged such that two stator sets of A phase and B phase are adjacent to each other in the motor axis direction. On the other hand, a structure in which four or more stator sets are arranged in the motor axis direction has been proposed as a structure that can ensure large torque even when the diameter of the stepping motor is reduced (see Patent Document 1). In Patent Document 1, a stator is constructed by arranging a cylindrical case around a plurality of stator sets.

特開２０００－１５２５９３号公報Japanese Patent Application Publication No. 2000-152593

しかしながら、特許文献１の記載の構成では、ステータの周りにケースを配置していため、ケースの厚さによって、モータの小径化が損なわれるという問題点がある。一方、特許文献１の記載の構成でケースを省略すると、ステータ組の同軸度を確保しながらモータを組み立てることが困難になる。 However, in the configuration described in Patent Document 1, since the case is arranged around the stator, there is a problem that the reduction in the diameter of the motor is impaired due to the thickness of the case. On the other hand, if the case is omitted in the configuration described in Patent Document 1, it becomes difficult to assemble the motor while ensuring coaxiality of the stator set.

以上の問題に鑑みて、本発明の課題は、ステータの細径化を図るにあたってステータ組の数を増やして大きなトルクを確保した場合でも、各ステータ組の同軸度を確保しやすいステッピングモータを提供することにある。 In view of the above problems, an object of the present invention is to provide a stepping motor that can easily ensure coaxiality of each stator group even when a large torque is secured by increasing the number of stator groups in order to reduce the diameter of the stator. It's about doing.

上記課題を解決するため、本発明に係るステッピングモータは、モータ軸線方向に延在
する回転軸の外周側に永久磁石を備えるロータと、前記永久磁石に径方向外側に対向するように配置された筒状のステータ部と、を有し、前記ステータ部では、第１コア、コイルが巻回されたコイルボビン、および第２コアがモータ軸線方向に重ねられたステータ組が前記モータ軸線方向に４つ以上の複数、配置されており、前記複数のステータ組の各々において、前記第１コアは、前記コイルボビンに重なる環状板部と、前記環状板部の外縁で屈曲して前記第２コアを径方向外側から覆う位置まで延在した筒状のケース部と、を備え、前記複数のステータ組は、前記ケース部同士が溶接により固定され、前記ステータ組では、前記モータ軸線方向で重なる２つのステータ組からなるステータがモータ軸線方向に複数、配置されており、前記２つのステータ組では、前記第１コア、前記コイルボビン、および前記第２コアの前記モータ軸線方向における相対位置が逆向きであって、前記２つのステータ組の前記ケース部の先端部同士が溶接により固定され、前記複数のステータの境界部では、前記ケース部における前記環状板部からの屈曲部の外側の面同士が溶接により固定されていることを特徴とする。
In order to solve the above problems, a stepping motor according to the present invention includes a rotor that includes a permanent magnet on the outer circumferential side of a rotating shaft that extends in the motor axis direction, and a rotor that is arranged to face the permanent magnet radially outside. and a cylindrical stator part, in the stator part, there are four stator sets in the motor axis direction, each of which has a first core, a coil bobbin around which the coil is wound, and a second core stacked one on top of the other in the motor axis direction. In each of the plurality of stator sets, the first core is bent at an annular plate portion that overlaps the coil bobbin, and an outer edge of the annular plate portion, and the second core is bent in the radial direction. a cylindrical case portion extending from the outside to a covering position, the case portions of the plurality of stator assemblies are fixed to each other by welding, and the stator assemblies include two stator assemblies that overlap in the motor axis direction. A plurality of stators are arranged in the motor axis direction, and in the two stator sets, the relative positions of the first core, the coil bobbin, and the second core in the motor axis direction are opposite, The tips of the case parts of the two stator sets are fixed to each other by welding, and at the boundary between the plurality of stators, the outer surfaces of the bent parts from the annular plate part in the case part are fixed to each other by welding. It is characterized by

本発明では、４つ以上のステータ組がモータ軸線方向に複数配置されているため、モータを細径化した場合でも、大きなトルクを得ることができる。また、複数のステータ組は、第１コアのケース部同士が溶接により固定されているため、ステータ組を別体のケースに収容しなくても、組立の際にステータ組の同軸度を確保しやすい。それ故、モータの細径化を図りやすい。 In the present invention, since a plurality of four or more stator sets are arranged in the motor axis direction, a large torque can be obtained even when the diameter of the motor is reduced. In addition, since the case parts of the first cores of multiple stator sets are fixed to each other by welding, coaxiality of the stator sets can be ensured during assembly without having to house the stator sets in separate cases. Cheap. Therefore, it is easy to reduce the diameter of the motor.

本発明に係るステッピングモータは、モータ軸線方向に延在する回転軸の外周側に永久磁石を備えるロータと、前記永久磁石に径方向外側に対向するように配置された筒状のステータ部と、を有し、前記ステータ部では、第１コア、コイルが巻回されたコイルボビン、および第２コアがモータ軸線方向に重ねられたステータ組が前記モータ軸線方向に４つ以上の複数、配置されており、前記複数のステータ組の各々において、前記第１コアは、前記コイルボビンに重なる環状板部と、前記環状板部の外縁で屈曲して前記第２コアを径方向外側から覆う位置まで延在した筒状のケース部と、を備え、前記複数のステータ組は、前記ケース部同士が溶接により固定され、前記ステータ組では、前記モータ軸線方向で重なる２つのステータ組からなるステータがモータ軸線方向に複数、配置されており、前記複数のステータ組では、前記第１コア、前記コイルボビン、および前記第２コアの前記モータ軸線方向における相対位置が同一であって、前記複数のステータ組の境界部では、前記モータ軸線方向で隣り合う２つのステータ組のうち、一方のステータ組の前記ケース部の先端部と、他方のステータ組の前記ケース部における前記環状板部からの屈曲部の外側の面とが溶接により固定されていることを特徴とする。A stepping motor according to the present invention includes: a rotor including a permanent magnet on the outer peripheral side of a rotating shaft extending in the motor axis direction; a cylindrical stator portion disposed to face the permanent magnet radially outward; In the stator section, a plurality of four or more stator sets each including a first core, a coil bobbin around which a coil is wound, and a second core are stacked in the motor axis direction are arranged in the motor axis direction. In each of the plurality of stator sets, the first core extends to a position where it bends at an annular plate portion overlapping the coil bobbin and an outer edge of the annular plate portion and covers the second core from the outside in the radial direction. and a cylindrical case portion, in which the case portions of the plurality of stator sets are fixed to each other by welding, and in the stator set, a stator consisting of two stator sets that overlap in the motor axis direction is arranged in the motor axis direction. In the plurality of stator sets, the relative positions of the first core, the coil bobbin, and the second core in the motor axis direction are the same, and the boundary between the plurality of stator sets is the same. Now, of the two stator sets adjacent in the motor axis direction, the tip of the case part of one stator set and the outer surface of the bent part from the annular plate part of the case part of the other stator set. and are fixed by welding.

本発明において、前記複数のステータの境界部では、周方向の一部で前記環状板部同士が接し、周方向の他の部分では、前記環状板部の間に隙間が空いている態様を採用することができる。かかる態様によれば、第１コアにケース部を設ける工程等の影響で環状板部がモータ軸線に対して直交する状態から斜めに傾いている場合には、環状板部同士が周方向の全体で接する態様よりも、同軸度を優先して環状板部の間の周方向の一部に隙間が空いていることを許容する。従って、組立の際にステータの同軸度を確保しやすい。 In the present invention, at the boundary between the plurality of stators, the annular plate parts are in contact with each other in a part in the circumferential direction, and in other parts in the circumferential direction, there is a gap between the annular plate parts. can do. According to this aspect, when the annular plate part is inclined obliquely from the state perpendicular to the motor axis due to the process of providing the case part to the first core, the annular plate parts are aligned with each other in the entire circumferential direction. The coaxiality is given priority over the aspect in which the annular plate parts are in contact with each other, and a gap is allowed to exist in a part of the circumferential direction between the annular plate parts. Therefore, it is easy to ensure coaxiality of the stator during assembly.

本発明において、前記屈曲部の径方向外側の面が、径方向外側に向けて凸状に湾曲した凸曲面になっている態様を採用することができる。かかる態様によれば、環状板部の外縁からケース部を絞り加工により屈曲させる際、屈曲部の径方向外側の面が凸曲面になるが、この場合でも、本発明では、凸曲面で溶接を行う。このため、環状板部の外縁からケース部を屈曲させる際、凸曲面が発生しないような特別な折り曲げ加工や、追加の後加工を行わなくてもよい。 In the present invention, an aspect may be adopted in which the radially outer surface of the bent portion is a convex curved surface that is convexly curved radially outward. According to this aspect, when the case portion is bent by drawing from the outer edge of the annular plate portion, the radially outer surface of the bent portion becomes a convex curved surface, but even in this case, in the present invention, welding is performed on the convex curved surface. conduct. Therefore, when bending the case portion from the outer edge of the annular plate portion, there is no need to perform a special bending process to prevent a convex curved surface from occurring or additional post-processing.

本発明において、前記複数のステータ組の各々において、前記ケース部には、モータ軸線方向で隣り合うステータ組同士の周方向の位置合わせを行う証が設けられている態様を採用することができる。 In the present invention, in each of the plurality of stator sets, an embodiment may be adopted in which the case portion is provided with a mark for circumferential positioning of adjacent stator sets in the motor axis direction.

本発明において、前記複数のステータ組の各々において、前記証は、前記ケース部に形成された切り欠きである態様を採用することができる。 In the present invention, in each of the plurality of stator sets, the mark may be a cutout formed in the case portion.

本発明において、前記切り欠きは、前記ケース部の軸線方向の全体にわたって延在する開口部であって、前記開口部からは、前記コイルボビンに形成された端子台が径方向外側に突出しており、前記複数のステータ組の前記開口部は、前記モータ軸線方向で繋がっている態様を採用することができる。モータを細径化した場合、第１コアのケース部に形成した開口部の周方向の寸法が短くなるが、本態様では、開口部をケース部のモータ軸線方向の全体にわたって延在させてある。また、開口部同士が前記モータ軸線方向で繋がっている。従って、開口部の開口面積が広いので、端子台を開口部から径方向外側に余裕をもって突出させることができる。 In the present invention, the notch is an opening that extends over the entire axial direction of the case portion, and a terminal block formed on the coil bobbin protrudes radially outward from the opening. The openings of the plurality of stator sets may be connected in the axial direction of the motor. When the diameter of the motor is reduced, the circumferential dimension of the opening formed in the case portion of the first core becomes shorter, but in this embodiment, the opening extends over the entire case portion in the motor axis direction. . Further, the openings are connected to each other in the motor axis direction. Therefore, since the opening area of the opening is large, the terminal block can be projected radially outward from the opening with a margin.

本発明において、前記複数のステータの各々において、前記２つのステータ組の一方がＡ相用ステータ組であり、他方がＢ相用ステータ組である態様を採用することができる。 In the present invention, in each of the plurality of stators, one of the two stator sets may be an A-phase stator set, and the other may be a B-phase stator set.

本発明において、前記複数のステータ部の外径が６ｍｍ以下である態様を採用することができる。 In the present invention, an aspect may be adopted in which the outer diameter of the plurality of stator parts is 6 mm or less.

本発明において、前記ステータ部は、前記複数のステータ組として４つのステータ組を
有する態様を採用することができる。 In the present invention, the stator section may have four stator groups as the plurality of stator groups.

本発明に係るステッピングモータの斜視図。FIG. 1 is a perspective view of a stepping motor according to the present invention. 図１に示すステッピングモータを別の方向からみたときの斜視図。FIG. 2 is a perspective view of the stepping motor shown in FIG. 1 when viewed from another direction. 図１に示すステッピングモータの断面図。2 is a sectional view of the stepping motor shown in FIG. 1. FIG. 図１に示すロータとステータとを分離させたときの分解斜視図。FIG. 2 is an exploded perspective view when the rotor and stator shown in FIG. 1 are separated. 図４に示すステータ部の分解斜視図。5 is an exploded perspective view of the stator section shown in FIG. 4. FIG. 図１に示す境界部で重なるＢ相用第１コアおよびＡ相用第１コアの説明図。FIG. 2 is an explanatory diagram of the B-phase first core and the A-phase first core that overlap at the boundary shown in FIG. 1 . 本発明の別の実施形態に係るステッピングモータの説明図。FIG. 6 is an explanatory diagram of a stepping motor according to another embodiment of the present invention.

以下に、図面を参照して、本発明を適用したステッピングモータ１を説明する。以下の説明では、回転軸２１の中心軸線（モータ軸線）に沿う方向を「モータ軸線方向Ｌ」としたとき、モータ軸線方向Ｌにおいて、「モータ軸線方向Ｌの一方側」がステータ部３から回転軸２１が突出している側（出力側Ｌａ）であって、「モータ軸線方向Ｌの他方側」がステータ部３から回転軸２１が突出している側（出力側Ｌａ）とは反対側の反出力側Ｌｂである場合を中心に説明する。また、以下の説明において、回転軸２１の中心軸線（モータ軸線）を中心とする径方向および周方向を単に「径方向」および「周方向」とする。 A stepping motor 1 to which the present invention is applied will be described below with reference to the drawings. In the following explanation, when the direction along the central axis (motor axis) of the rotating shaft 21 is defined as the "motor axis direction L", in the motor axis direction L, "one side of the motor axis direction L" rotates from the stator section 3. The side from which the shaft 21 protrudes (output side La), and the "other side in the motor axis direction L" is the opposite output from the side from which the rotating shaft 21 protrudes from the stator section 3 (output side La). The case where it is the side Lb will be mainly explained. In the following description, the radial direction and circumferential direction centered on the central axis (motor axis) of the rotating shaft 21 are simply referred to as "radial direction" and "circumferential direction."

（ステッピングモータ１の全体構成）
図１は、本発明に係るステッピングモータ１の斜視図である。図２は、図１に示すステッピングモータ１を別の方向からみたときの斜視図である。図３は、図１に示すステッピングモータ１の断面図である。図４は、図１に示すロータ２とステータ３０とを分離させたときの分解斜視図である。 (Overall configuration of stepping motor 1)
FIG. 1 is a perspective view of a stepping motor 1 according to the present invention. FIG. 2 is a perspective view of the stepping motor 1 shown in FIG. 1 viewed from another direction. FIG. 3 is a sectional view of the stepping motor 1 shown in FIG. 1. FIG. 4 is an exploded perspective view when the rotor 2 and stator 30 shown in FIG. 1 are separated.

図１、図２、および図３に示すように、本形態のステッピングモータ１は、モータ軸線方向Ｌに延在する回転軸２１の外周側に円筒状の永久磁石２２を備えるロータ２と、永久磁石２２に径方向外側に対向するように配置された筒状のステータ部３とを備えている。回転軸２１は、ステンレス、真鍮、アルミニウム等の金属材料からなる。永久磁石２２は、希土類系の磁粉を用いたボンド磁石であり、Ｎ極とＳ極が周方向において交互に設けられている。 As shown in FIGS. 1, 2, and 3, the stepping motor 1 of the present embodiment includes a rotor 2 having a cylindrical permanent magnet 22 on the outer peripheral side of a rotating shaft 21 extending in the motor axis direction L, and a permanent magnet 22. It includes a cylindrical stator portion 3 arranged to face the magnet 22 on the outside in the radial direction. The rotating shaft 21 is made of a metal material such as stainless steel, brass, or aluminum. The permanent magnet 22 is a bonded magnet using rare earth magnetic powder, and has N poles and S poles alternately provided in the circumferential direction.

ステータ部３の出力側Ｌａの端部には第１端板７０が溶接等によって固定され、第１端板７０には、回転軸２１を回転可能に支持する第１軸受７５が保持されている。第１軸受７５は、筒部７５１と、筒部７５１より出力側Ｌａで拡径する大径部７５２とを有しており、筒部７５１が第１端板７０の貫通穴７１を貫通した状態で第１端板７０の出力側Ｌａの面に大径部７５２が当接している。この状態で、第１軸受７５は、筒部７５１の反出力側Ｌｂの端部に対するカシメ等により第１端板７０に固定されている。本形態において、回転軸２１には、永久磁石２２と第１軸受７５との間にワッシャ９０が装着されている。従って、ロータ２が出力側Ｌａに移動したときでも、第１軸受７５と永久磁石２２とが接することがない。 A first end plate 70 is fixed to the end of the output side La of the stator section 3 by welding or the like, and the first end plate 70 holds a first bearing 75 that rotatably supports the rotating shaft 21. . The first bearing 75 has a cylindrical portion 751 and a large diameter portion 752 whose diameter increases from the cylindrical portion 751 on the output side La, and the cylindrical portion 751 passes through the through hole 71 of the first end plate 70. The large diameter portion 752 is in contact with the output side La surface of the first end plate 70 . In this state, the first bearing 75 is fixed to the first end plate 70 by caulking the end of the cylindrical portion 751 on the non-output side Lb. In this embodiment, a washer 90 is attached to the rotating shaft 21 between the permanent magnet 22 and the first bearing 75. Therefore, even when the rotor 2 moves to the output side La, the first bearing 75 and the permanent magnet 22 do not come into contact with each other.

ステータ部３の反出力側Ｌｂの端部には第２端板８０が固定され、第２端板８０には、回転軸２１を回転可能に支持する第２軸受８５が保持されている。第２軸受８５は、筒部８５１と、筒部８５１より出力側Ｌａで拡径する大径部８５２とを有しており、筒部８５１が第２端板８０の貫通穴８１を貫通した状態で第２端板８０の出力側Ｌａの面に大径部８５２が当接している。この状態で、第２軸受８５は、筒部８５１の反出力側Ｌｂの端部に対するカシメ等により第２端板８０に固定されている。ここで、第２軸受８５の大径部８５２の外周部分は、後述するＢ相用極歯６１２Ｂの根元部分の内側に当接し、第２軸受８５の径方向の位置決めが行われる。従って、第２軸受８５は、Ｂ相用極歯６１２Ｂの根元部分を基準にして径方向で適正に位置決めされる。なお、第２端板８０の反出力側Ｌｂの面において貫通穴８１の周りを凹部としておき、筒部８５１の反出力側Ｌｂの端部が第２端板８０から反出力側Ｌｂに突出することを抑制する態様を採用してもよい。 A second end plate 80 is fixed to the end of the stator section 3 on the non-output side Lb, and a second bearing 85 that rotatably supports the rotating shaft 21 is held in the second end plate 80. The second bearing 85 has a cylindrical portion 851 and a large diameter portion 852 whose diameter increases from the cylindrical portion 851 on the output side La, and the cylindrical portion 851 passes through the through hole 81 of the second end plate 80. The large diameter portion 852 is in contact with the output side La surface of the second end plate 80 . In this state, the second bearing 85 is fixed to the second end plate 80 by caulking the end of the cylindrical portion 851 on the non-output side Lb. Here, the outer peripheral portion of the large diameter portion 852 of the second bearing 85 comes into contact with the inside of the root portion of the B-phase pole tooth 612B, which will be described later, and the second bearing 85 is positioned in the radial direction. Therefore, the second bearing 85 is appropriately positioned in the radial direction with reference to the root portion of the B-phase pole tooth 612B. Note that a recess is formed around the through hole 81 on the surface of the non-output side Lb of the second end plate 80, and the end of the cylindrical portion 851 on the non-output side Lb protrudes from the second end plate 80 to the non-output side Lb. You may adopt an aspect to suppress this.

（ステータ部３の構成）
図５は、図４に示すステータ部３の分解斜視図である。図３、図４、および図５を参照して以下に説明するように、ステータ部３では、第１コア、コイルが巻回されたコイルボビン、および第２コアがモータ軸線方向に重ねられたステータ組がモータ軸線方向に４つ以上、配置されており、複数のステータ組のうち、モータ軸線方向Ｌで隣り合う２つのステータ組によってステータ３０が構成されている。従って、ステータ部３では、複数のステータ３０がモータ軸線方向Ｌに重ねて配置されている。従って、ステッピングモータ１を細径化した場合でも、大きなトルクを得ることができる。 (Configuration of stator section 3)
FIG. 5 is an exploded perspective view of the stator section 3 shown in FIG. 4. As described below with reference to FIGS. 3, 4, and 5, the stator unit 3 includes a stator in which a first core, a coil bobbin around which a coil is wound, and a second core are stacked in the motor axis direction. Four or more sets are arranged in the motor axis direction, and the stator 30 is constituted by two stator sets adjacent in the motor axis direction L among the plurality of stator sets. Therefore, in the stator section 3, a plurality of stators 30 are arranged one on top of the other in the motor axis direction L. Therefore, even if the diameter of the stepping motor 1 is reduced, a large torque can be obtained.

かかる構成に対応して、ロータ２において、永久磁石２２は、複数のステータ３０の各々に対向するように回転軸２１に固定された複数の磁石２２０からなる。従って、モータ軸線方向Ｌに長く延在した磁石を用いる場合より、製造しやすくて安価な磁石を用いることができる。 Corresponding to this configuration, in the rotor 2, the permanent magnets 22 include a plurality of magnets 220 fixed to the rotating shaft 21 so as to face each of the plurality of stators 30. Therefore, it is possible to use a magnet that is easier to manufacture and cheaper than when a magnet that extends long in the motor axis direction L is used.

本形態において、ステータ部３は、外径が６ｍｍ以下となるように細径化されている。従って、複数のステータ３０はいずれも、外径が６ｍｍ以下である。それ故、ロータ２において、回転軸２１の外径は１ｍｍ以下である。なお、ステータ部３のモータ軸線方向Ｌの長さは１０ｍｍを超える寸法を有している。 In this embodiment, the stator portion 3 is reduced in diameter so that the outer diameter is 6 mm or less. Therefore, all of the plurality of stators 30 have an outer diameter of 6 mm or less. Therefore, in the rotor 2, the outer diameter of the rotating shaft 21 is 1 mm or less. Note that the length of the stator portion 3 in the motor axis direction L exceeds 10 mm.

本形態において、ステータ部３では、４つのステータ組がモータ軸線方向Ｌに配置されている。従って、ステータ部３では、２つのステータ３０（第１ステータ３１および第２ステータ３２）がモータ軸線方向Ｌに配置されている。また、永久磁石２２は、第１ステータ３１と対向する第１磁石２２１と、第２ステータ３２と対向する第２磁石２２２とからなる。複数の磁石２２０の各々において、反出力側Ｌｂの端面、および出力側Ｌａの端面には凹部２２６、２２７が形成されており、凹部２２７には、磁石２２０と回転軸２１とを固定する接着剤２９が設けられている。 In this embodiment, in the stator section 3, four stator groups are arranged in the motor axis direction L. Therefore, in the stator section 3, two stators 30 (first stator 31 and second stator 32) are arranged in the motor axis direction L. Further, the permanent magnet 22 includes a first magnet 221 facing the first stator 31 and a second magnet 222 facing the second stator 32. In each of the plurality of magnets 220, recesses 226 and 227 are formed in the end face on the opposite output side Lb and the end face on the output side La, and the recess 227 is filled with an adhesive for fixing the magnet 220 and the rotating shaft 21. 29 are provided.

以下の説明では、２つのステータ３０のうち、モータ軸線方向Ｌの反出力側Ｌｂのステータ３０を第１ステータ３１とし、第１ステータ３１に対してモータ軸線方向Ｌの出力側Ｌａに重なるステータ３０を第２ステータ３２とする。ここで、複数のステータ３０は、形状やサイズ等の構成が同一である。従って、第１ステータ３１と第２ステータ３２とは構成が同一である。それ故、ステータ３０を説明する際、第１ステータ３１と第２ステータ３２とを区別する必要がない場合には、第１ステータ３１および第２ステータ３２を単にステータ３０として説明する。 In the following description, of the two stators 30, the stator 30 on the opposite output side Lb in the motor axis direction L will be referred to as the first stator 31, and the stator 30 that overlaps with the first stator 31 on the output side La in the motor axis direction L will be referred to as the first stator 31. is the second stator 32. Here, the plurality of stators 30 have the same configuration such as shape and size. Therefore, the first stator 31 and the second stator 32 have the same configuration. Therefore, when describing the stator 30, if there is no need to distinguish between the first stator 31 and the second stator 32, the first stator 31 and the second stator 32 will be simply referred to as the stator 30.

複数のステータ３０において、２つのステータ組の一方がＡ相用であり、他方がＢ相用である。より具体的には、複数のステータ３０は各々、Ａ相用ステータ組３０Ａと、Ａ相用ステータ組３０Ａに対して反出力側Ｌｂから重なるＢ相用ステータ組３０Ｂとを有して
おり、ステータ部３では、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとが交互に配置されている。複数のステータ３０の各々において、Ａ相用ステータ組３０ＡおよびＢ相用ステータ組３０Ｂは、基本的な構造が同一であるが、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとは、第１コア、コイルボビン、および第２コアのモータ軸線方向Ｌにおける相対位置が逆向きである。 In the plurality of stators 30, one of the two stator sets is for A phase, and the other is for B phase. More specifically, each of the plurality of stators 30 has an A-phase stator set 30A and a B-phase stator set 30B that overlaps the A-phase stator set 30A from the opposite output side Lb, and the stator In section 3, A-phase stator sets 30A and B-phase stator sets 30B are alternately arranged. In each of the plurality of stators 30, the A-phase stator group 30A and the B-phase stator group 30B have the same basic structure, but the A-phase stator group 30A and the B-phase stator group 30B have the same basic structure. The relative positions of the first core, the coil bobbin, and the second core in the motor axis direction L are opposite.

より具体的には、図３、図４および図５に示すように、Ａ相用ステータ組３０Ａは、Ａ相用コイル４０Ａが巻回されたＡ相用コイルボビン５０Ａと、Ａ相用コイルボビン５０Ａに出力側Ｌａから重なるＡ相用第１コア６１Ａと、Ａ相用コイルボビン５０Ａに反出力側Ｌｂから重なるＡ相用第２コア６２Ａとを有している。Ａ相用コイルボビン５０Ａは、円筒状の胴部５３Ａと、胴部５３Ａの出力側Ｌａの端部で拡径するフランジ部５１Ａと、胴部５３Ａの反出力側Ｌｂの端部で拡径するフランジ部５２Ａとを有しており、フランジ部５１Ａとフランジ部５２Ａとの間で胴部５３Ａの周りにＡ相用コイル４０Ａが巻回されている。 More specifically, as shown in FIGS. 3, 4, and 5, the A-phase stator set 30A includes an A-phase coil bobbin 50A around which the A-phase coil 40A is wound, and an A-phase coil bobbin 50A. It has an A-phase first core 61A that overlaps from the output side La, and an A-phase second core 62A that overlaps the A-phase coil bobbin 50A from the opposite output side Lb. The A-phase coil bobbin 50A includes a cylindrical body 53A, a flange 51A that expands in diameter at an end on the output side La of the body 53A, and a flange that expands in diameter at an end on the non-output side Lb of the body 53A. The A-phase coil 40A is wound around the body portion 53A between the flange portion 51A and the flange portion 52A.

本形態において、Ａ相用第１コア６１Ａは、Ａ相用コイルボビン５０Ａのフランジ部５１Ａに重なる環状板部６１１Ａ（Ａ相用環状板部）と、環状板部６１１Ａの内縁の周方向の複数箇所から反出力側Ｌｂに折れ曲がったＡ相用極歯６１２Ａと、環状板部６１１Ａの外縁から反出力側Ｌｂに折れ曲がったＡ相用ケース部６１３Ａとを有している。Ａ相用第２コア６２Ａは、Ａ相用コイルボビン５０Ａのフランジ部５２Ａに重なる環状板部６２１Ａと、環状板部６２１Ａの内縁の周方向の複数箇所から出力側Ｌａに折れ曲がったＡ相用極歯６２２Ａとを有しており、ケース部は設けられていない。このように構成したＡ相用第１コア６１ＡおよびＡ相用第２コア６２ＡをＡ相用コイルボビン５０Ａに重ねると、胴部５３Ａの内周面に沿って、Ａ相用第１コア６１ＡのＡ相用極歯６１２ＡとＡ相用第２コア６２ＡのＡ相用極歯６２２Ａが周方向で交互に配置される。また、Ａ相用ケース部６１３Ａは、Ａ相用第２コア６２Ａの環状板部６１１Ａを径方向外側で覆う。 In this embodiment, the A-phase first core 61A includes an annular plate portion 611A (A-phase annular plate portion) that overlaps the flange portion 51A of the A-phase coil bobbin 50A, and multiple locations in the circumferential direction of the inner edge of the annular plate portion 611A. It has an A-phase pole tooth 612A that is bent toward the opposite output side Lb, and an A-phase case portion 613A that is bent from the outer edge of the annular plate portion 611A toward the opposite output side Lb. The A-phase second core 62A includes an annular plate portion 621A that overlaps the flange portion 52A of the A-phase coil bobbin 50A, and an A-phase pole tooth that is bent toward the output side La from multiple locations in the circumferential direction of the inner edge of the annular plate portion 621A. 622A, and no case part is provided. When the A-phase first core 61A and the A-phase second core 62A configured in this way are stacked on the A-phase coil bobbin 50A, the The phase pole teeth 612A and the A-phase pole teeth 622A of the A-phase second core 62A are arranged alternately in the circumferential direction. Further, the A-phase case portion 613A covers the annular plate portion 611A of the A-phase second core 62A on the outside in the radial direction.

Ｂ相用ステータ組３０Ｂは、Ｂ相用コイル４０Ｂが巻回されたＢ相用コイルボビン５０Ｂと、Ｂ相用コイルボビン５０Ｂに反出力側Ｌｂから重なるＢ相用第１コア６１Ｂと、Ｂ相用コイルボビン５０Ｂに出力側Ｌａから重なるＢ相用第２コア６２Ｂとを備えている。Ｂ相用コイルボビン５０Ｂは、円筒状の胴部５３Ｂと、胴部５３Ｂの反出力側Ｌｂの端部で拡径するフランジ部５１Ｂと、胴部５３Ｂの出力側Ｌａの端部で拡径するフランジ部５２Ｂとを有しており、フランジ部５１Ｂとフランジ部５２Ｂとの間で胴部５３Ｂの周りにＢ相用コイル４０Ｂが巻回されている。 The B-phase stator set 30B includes a B-phase coil bobbin 50B around which a B-phase coil 40B is wound, a B-phase first core 61B that overlaps the B-phase coil bobbin 50B from the non-output side Lb, and a B-phase coil bobbin. 50B is provided with a B-phase second core 62B overlapping from the output side La. The B-phase coil bobbin 50B includes a cylindrical body 53B, a flange 51B that expands in diameter at an end on the non-output side Lb of the body 53B, and a flange that expands in diameter at an end on the output side La of the body 53B. The B-phase coil 40B is wound around the body portion 53B between the flange portion 51B and the flange portion 52B.

本形態において、Ｂ相用第１コア６１Ｂは、Ｂ相用コイルボビン５０Ｂのフランジ部５１Ｂに重なる環状板部６１１Ｂ（Ｂ相用環状板部）と、環状板部６１１Ｂの内縁の周方向の複数箇所から出力側Ｌａに折れ曲がったＢ相用極歯６１２Ｂと、環状板部６１１Ｂの外縁から出力側Ｌａに折れ曲がったＢ相用ケース部６１３Ｂとを有している。Ｂ相用第２コア６２Ｂは、Ｂ相用コイルボビン５０Ｂのフランジ部５２Ｂに重なる環状板部６２１Ｂと、環状板部６２１Ｂの内縁の周方向の複数箇所から反出力側Ｌｂに折れ曲がったＢ相用極歯６２２Ｂとを有しており、ケース部は設けられていない。このように構成したＢ相用第１コア６１ＢおよびＢ相用第２コア６２ＢをＢ相用コイルボビン５０Ｂに重ねると、胴部５３Ｂの内周面に沿って、Ｂ相用第１コア６１ＢのＢ相用極歯６１２ＢとＢ相用第２コア６２ＢのＢ相用極歯６２２Ｂが周方向で交互に配置される。また、Ｂ相用ケース部６１３Ｂは、Ｂ相用第２コア６２Ｂの環状板部６１１Ｂを径方向外側で覆う。 In this embodiment, the B-phase first core 61B includes an annular plate portion 611B (B-phase annular plate portion) that overlaps the flange portion 51B of the B-phase coil bobbin 50B, and multiple locations in the circumferential direction of the inner edge of the annular plate portion 611B. It has a B-phase pole tooth 612B that is bent toward the output side La, and a B-phase case portion 613B that is bent from the outer edge of the annular plate portion 611B toward the output side La. The B-phase second core 62B includes an annular plate portion 621B that overlaps the flange portion 52B of the B-phase coil bobbin 50B, and a B-phase pole that is bent toward the opposite output side Lb from multiple locations in the circumferential direction of the inner edge of the annular plate portion 621B. It has teeth 622B and is not provided with a case portion. When the B-phase first core 61B and the B-phase second core 62B configured in this way are stacked on the B-phase coil bobbin 50B, the The phase pole teeth 612B and the B-phase pole teeth 622B of the B-phase second core 62B are arranged alternately in the circumferential direction. Further, the B-phase case portion 613B covers the annular plate portion 611B of the B-phase second core 62B on the outside in the radial direction.

本形態では、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとがモータ軸線方向Ｌで重なるようにステッピングモータ１を組み立てる際、後述するＡ相用開口部６１４ＡとＢ相用開口部６１４Ｂとを基準にしてモータ軸線を中心とする角度位置を調整する。その
結果、複数のステータ３０の各々において、Ａ相用極歯６１２Ａ、６２２ＡとＢ相用極歯６１２Ｂ、６２２Ｂとは、所定の電気角に沿う角度分、位置がずれる。従って、ステッピングモータ１を駆動する際、Ａ相用コイル４０ＡとＢ相用コイル４０Ｂには、所定の電気角に沿う角度分、位相のずれた駆動信号が供給される。それ故、ロータ２の停止位置等の精度を高めることができる。 In this embodiment, when assembling the stepping motor 1 so that the A-phase stator set 30A and the B-phase stator set 30B overlap in the motor axis direction L, the A-phase opening 614A and the B-phase opening 614B, which will be described later, Adjust the angular position around the motor axis based on . As a result, in each of the plurality of stators 30, the positions of the A-phase pole teeth 612A, 622A and the B-phase pole teeth 612B, 622B are shifted by an angle along a predetermined electrical angle. Therefore, when driving the stepping motor 1, the A-phase coil 40A and the B-phase coil 40B are supplied with drive signals that are out of phase by an angle along a predetermined electrical angle. Therefore, the accuracy of the stopping position of the rotor 2, etc. can be improved.

また、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとがモータ軸線方向Ｌで重なるようにステッピングモータ１を組み立てる際、複数のステータ３０の各々において、Ａ相用ケース部６１３ＡのＡ相用第２コア６２Ａ側の先端部６１５Ａと、Ｂ相用ケース部６１３ＢのＢ相用第２コア６２Ｂ側の先端部６１５Ｂとがモータ軸線方向Ｌで当接する。 In addition, when assembling the stepping motor 1 so that the A-phase stator set 30A and the B-phase stator set 30B overlap in the motor axis direction L, in each of the plurality of stators 30, the A-phase case portion 613A is The tip portion 615A on the second core 62A side and the tip portion 615B on the B-phase second core 62B side of the B-phase case portion 613B abut in the motor axial direction L.

また、複数のステータ３０をモータ軸線方向Ｌで重ねると、ステータ３０の境界部３５では、Ｂ相用第１コア６１ＢとＡ相用第１コア６１Ａとが重なる。より具体的には、第１ステータ３１と第２ステータ３２とをモータ軸線方向Ｌで重ねると、第１ステータ３１と第２ステータ３２との境界部３５では、第１ステータ３１のＡ相用第１コア６１Ａと、第２ステータ３２のＢ相用第１コア６１Ｂとが重なる。 Further, when a plurality of stators 30 are overlapped in the motor axis direction L, the B-phase first core 61B and the A-phase first core 61A overlap at the boundary portion 35 of the stator 30. More specifically, when the first stator 31 and the second stator 32 are overlapped in the motor axis direction L, at the boundary 35 between the first stator 31 and the second stator 32, the A-phase The first core 61A and the B-phase first core 61B of the second stator 32 overlap.

（開口部６１４および端子台５５Ａ、５５Ｂ等の構成）
複数のステータ３０の各々において、Ａ相用コイルボビン５０Ａの２つのフランジ部５１Ａ、５２Ａの一方のフランジ部の外周側の端部にはＡ相用端子台５５Ａが設けられ、Ｂ相用コイルボビン５０Ｂの２つのフランジ部５１Ｂ、５２Ｂの一方のフランジ部の外周側の端部にはＢ相用端子台５５Ｂが設けられている。Ａ相用端子台５５Ａには、樹脂製のＡ相用端子ピン５６Ａが径方向外側に突出するように形成されている。Ａ相用コイルボビン５０Ａにコイル線を巻回してＡ相用コイル４０Ａを構成する際、コイル線の端部をＡ相用端子ピン５６Ａに絡げた後、ハンダ付けを行うことによって、端子が構成される。また、Ｂ相用端子台５５Ｂには、樹脂製のＢ相用端子ピン５６Ｂが径方向外側に突出するように形成されている。Ｂ相用コイルボビン５０Ｂにコイル線を巻回してＢ相用コイル４０Ｂを構成する際、コイル線の端部をＢ相用端子ピン５６Ｂに絡げた後、ハンダ付けを行うことによって、端子が構成される。 (Configuration of opening 614, terminal blocks 55A, 55B, etc.)
In each of the plurality of stators 30, an A-phase terminal block 55A is provided at the outer peripheral end of one of the two flanges 51A and 52A of the A-phase coil bobbin 50A, and A B-phase terminal block 55B is provided at the outer peripheral end of one of the two flange parts 51B and 52B. The A-phase terminal block 55A is formed with an A-phase terminal pin 56A made of resin so as to protrude outward in the radial direction. When forming the A-phase coil 40A by winding a coil wire around the A-phase coil bobbin 50A, the terminal is formed by winding the end of the coil wire around the A-phase terminal pin 56A and then soldering. Ru. Further, a resin-made B-phase terminal pin 56B is formed on the B-phase terminal block 55B so as to protrude outward in the radial direction. When forming the B-phase coil 40B by winding a coil wire around the B-phase coil bobbin 50B, the terminal is formed by winding the end of the coil wire around the B-phase terminal pin 56B and then soldering. Ru.

一方、Ａ相用ケース部６１３Ａには、先端部６１５Ａから出力側Ｌａに向けて延在する切り欠きからなるＡ相用開口部６１４Ａが形成され、Ｂ相用ケース部６１３Ｂには、先端部６１５Ｂから反出力側Ｌｂに向けて延在した切り欠きからなるＢ相用開口部６１４Ｂが形成されている。従って、Ａ相用端子台５５Ａ、およびＢ相用端子台５５ＢをＡ相用開口部６１４ＡおよびＢ相用開口部６１４Ｂから径方向外側に向けて突出させることができる。 On the other hand, the A-phase case portion 613A is formed with an A-phase opening 614A consisting of a notch extending from the tip 615A toward the output side La, and the B-phase case portion 613B is formed with a tip 615B. A B-phase opening 614B consisting of a notch extending from the side toward the non-output side Lb is formed. Therefore, the A-phase terminal block 55A and the B-phase terminal block 55B can be made to protrude radially outward from the A-phase opening 614A and the B-phase opening 614B.

ここで、Ａ相用開口部６１４Ａは、Ａ相用ケース部６１３Ａのモータ軸線方向Ｌの全体にわたって延在し、Ｂ相用開口部６１４Ｂは、Ｂ相用ケース部６１３Ｂのモータ軸線方向Ｌの全体にわたって延在している。このため、ステータ部３を細径化した結果、Ａ相用開口部６１４Ａ、およびＢ相用開口部６１４Ｂの周方向の寸法が短いが、Ａ相用開口部６１４Ａ、およびＢ相用開口部６１４Ｂは大きな開口面積を有している。従って、ステッピングモータ１の小径化を図った場合でも、Ａ相用端子台５５Ａ、およびＢ相用端子台５５Ｂを開口部６１４から径方向外側に向けて余裕をもって突出させることができる。 Here, the A-phase opening 614A extends over the entire A-phase case portion 613A in the motor axial direction L, and the B-phase opening 614B extends over the entire B-phase case portion 613B in the motor axial direction L. It extends across the country. Therefore, as a result of reducing the diameter of the stator portion 3, the dimensions in the circumferential direction of the A-phase opening 614A and the B-phase opening 614B are short, but the A-phase opening 614A and the B-phase opening 614B has a large opening area. Therefore, even when the diameter of the stepping motor 1 is reduced, the A-phase terminal block 55A and the B-phase terminal block 55B can be made to protrude radially outward from the opening 614 with a margin.

また、複数のステータ３０の各々において、Ａ相用開口部６１４ＡとＢ相用ケース部６１３Ｂとはモータ軸線を中心とする同一の角度位置に形成されている。従って、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとをモータ軸線方向Ｌで重ねてステータ３０とした際、複数のステータ３０の各々において、Ａ相用開口部６１４ＡとＢ相用ケース部６１３Ｂとはモータ軸線方向Ｌで繋がって１つの開口部６１４を構成している。それ故、ス
テッピングモータ１の小径化を図った場合でも、Ａ相用端子台５５Ａ、およびＢ相用端子台５５Ｂを開口部６１４から径方向外側に向けて余裕をもって突出させることができる。 Further, in each of the plurality of stators 30, the A-phase opening 614A and the B-phase case portion 613B are formed at the same angular position centering on the motor axis. Therefore, when the A-phase stator set 30A and the B-phase stator set 30B are stacked together in the motor axis direction L to form the stator 30, in each of the plurality of stators 30, the A-phase opening 614A and the B-phase case part 613B are connected in the motor axis direction L to form one opening 614. Therefore, even when reducing the diameter of the stepping motor 1, the A-phase terminal block 55A and the B-phase terminal block 55B can be made to protrude radially outward from the opening 614 with a margin.

さらに、複数のステータ３０のいずれにおいても、開口部６１４（Ａ相用開口部６１４ＡおよびＢ相用ケース部６１３Ｂ）は、モータ軸線を中心とする同一の角度位置に形成されている。従って、複数のステータ３０をモータ軸線方向Ｌで重ねてステータ部３とした際、複数のステータ３０の各々に形成された開口部６１４（Ａ相用開口部６１４ＡおよびＢ相用ケース部６１３Ｂ）は、ステータ部３のモータ軸線方向Ｌの全体にわたって連続して延在する１つの開口部を構成している。それ故、ステッピングモータ１の小径化を図った場合でも、２つのＡ相用端子台５５Ａ、および２つのＢ相用端子台５５Ｂを開口部６１４から径方向外側に向けて余裕をもって突出させることができる。 Furthermore, in any of the plurality of stators 30, the openings 614 (A-phase opening 614A and B-phase case portion 613B) are formed at the same angular position with respect to the motor axis. Therefore, when a plurality of stators 30 are stacked in the motor axis direction L to form a stator section 3, the openings 614 (A-phase opening 614A and B-phase case section 613B) formed in each of the plurality of stators 30 are , constitutes one opening that extends continuously over the entire stator portion 3 in the motor axis direction L. Therefore, even when reducing the diameter of the stepping motor 1, it is possible to make the two A-phase terminal blocks 55A and the two B-phase terminal blocks 55B protrude radially outward from the opening 614 with a margin. can.

本形態では、Ａ相用端子台５５ＡがＡ相用コイルボビン５０Ａの反出力側Ｌｂのフランジ部５２Ａに設けられ、Ｂ相用端子台５５Ｂは、Ｂ相用コイルボビン５０Ｂの反出力側Ｌｂのフランジ部５１Ｂに設けられている。従って、Ａ相用端子台５５ＡおよびＢ相用端子台５５Ｂは各々、モータ軸線方向Ｌにおいて十分な間隔をもって配置されている。 In this embodiment, the A-phase terminal block 55A is provided on the flange portion 52A on the non-output side Lb of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion on the non-output side Lb of the B-phase coil bobbin 50B. 51B. Therefore, the A-phase terminal block 55A and the B-phase terminal block 55B are each arranged at sufficient intervals in the motor axis direction L.

図５に示すように、Ａ相用第２コア６２Ａの環状板部６２１Ａには、径方向外側に突出した突出部６２８Ａが形成され、Ｂ相用第２コア６２Ｂの環状板部６２１Ｂには、径方向外側に突出した突出部６２８Ｂが形成されている。一方、図２に示すように、Ａ相用ケース部６１３Ａの先端部６１５Ａには、Ａ相用開口部６１４Ａと反対側に切り欠き６１８Ａが形成され、Ｂ相用ケース部６１３Ｂの先端部６１５Ｂには、Ｂ相用開口部６１４Ｂと反対側に切り欠き６１８Ｂが形成されている。従って、Ａ相用第２コア６２Ａの突出部６２８Ａ、およびＢ相用第２コア６２Ｂの突出部６２８Ｂは、モータ軸線方向Ｌで重なった状態で切り欠き６１８Ａ、６１８Ｂから露出した状態にある。 As shown in FIG. 5, the annular plate part 621A of the A-phase second core 62A is formed with a protrusion 628A that protrudes radially outward, and the B-phase second core 62B has an annular plate part 621B. A protrusion 628B is formed that protrudes radially outward. On the other hand, as shown in FIG. 2, a notch 618A is formed in the tip 615A of the A-phase case portion 613A on the opposite side to the A-phase opening 614A, and a notch 618A is formed in the tip 615B of the B-phase case portion 613B. A notch 618B is formed on the opposite side to the B-phase opening 614B. Therefore, the protrusion 628A of the A-phase second core 62A and the protrusion 628B of the B-phase second core 62B are exposed from the cutouts 618A and 618B while overlapping in the motor axis direction L.

（ステータ３０の境界部３５での固定構造）
図６は、図１に示す境界部３５で重なるＢ相用第１コア６１ＢおよびＡ相用第１コア６１Ａの説明図である。 (Fixing structure at boundary portion 35 of stator 30)
FIG. 6 is an explanatory diagram of the B-phase first core 61B and the A-phase first core 61A that overlap at the boundary portion 35 shown in FIG.

本形態のステッピングモータ１において、複数のステータ３０の境界部３５で重なるＢ相用第１コア６１ＢとＡ相用第１コア６１Ａとが固定されている。より具体的には、図６に示すように、複数のステータ３０の境界部３５で重なる第２ステータ３２のＢ相用第１コア６１Ｂと第１ステータ３１のＡ相用第１コア６１Ａとが溶接により固定されている。本形態においては、複数のステータ３０の境界部３５で重なるＢ相用第１コア６１ＢとＡ相用第１コア６１Ａとは、環状板部６１１ＢとＢ相用ケース部６１３Ｂとの間の屈曲部６１６Ｂの外側の面と、環状板部６１１ＡとＡ相用ケース部６１３Ａとの間の屈曲部６１６Ａの外側の面との間に対する溶接によって固定されている。このため、複数のステータの境界部３５で重なるＢ相用第１コア６１ＢとＡ相用第１コア６１Ａとを溶接により固定した際の第１溶接痕６６が、屈曲部６１６Ｂの外側の面、および屈曲部６１６Ａの外側の面の双方に跨るように存在している。かかる固定構造を採用するにあたって、本形態では、Ｂ相用第１コア６１ＢのＢ相用ケース部６１３Ｂに形成したＢ相用開口部６１４Ｂ（切り欠き）と、Ａ相用第１コア６１ＡのＡ相用ケース部６１３Ａに形成したＡ相用開口部６１４Ａ（切り欠き）とを証にして、Ｂ相用第１コア６１ＢとＡ相用第１コア６１Ａとの周方向の位置を合せる。 In the stepping motor 1 of this embodiment, the B-phase first core 61B and the A-phase first core 61A, which overlap at the boundary 35 of the plurality of stators 30, are fixed. More specifically, as shown in FIG. 6, the B-phase first core 61B of the second stator 32 and the A-phase first core 61A of the first stator 31 overlap at the boundary 35 of the plurality of stators 30. Fixed by welding. In this embodiment, the B-phase first core 61B and the A-phase first core 61A, which overlap at the boundary 35 of the plurality of stators 30, are located at the bent portion between the annular plate portion 611B and the B-phase case portion 613B. It is fixed by welding between the outer surface of 616B and the outer surface of the bent portion 616A between the annular plate portion 611A and the A-phase case portion 613A. Therefore, the first welding marks 66 when the B-phase first core 61B and the A-phase first core 61A, which overlap at the boundary part 35 of the plurality of stators are fixed by welding, are formed on the outer surface of the bent part 616B, and the outer surface of the bent portion 616A. In adopting such a fixing structure, in this embodiment, the B-phase opening 614B (notch) formed in the B-phase case portion 613B of the B-phase first core 61B and the A Using the A-phase opening 614A (notch) formed in the phase case portion 613A as evidence, align the circumferential positions of the B-phase first core 61B and the A-phase first core 61A.

従って、Ａ相用ステータ組３０ＡやＢ相用ステータ組３０Ｂを組み立てる前のＡ相用第１コア６１ＡおよびＢ相用第１コア６１Ｂの状態で、境界部３５でＡ相用第１コア６１ＡとＢ相用第１コア６１Ｂとを溶接によって固定できる他、Ａ相用ステータ組３０ＡやＢ相用ステータ組３０Ｂを組み立てた後であっても、Ａ相用第１コア６１ＡとＢ相用第１コア
６１Ｂとを境界部３５で溶接によって固定することができる。 Therefore, in the state of the A-phase first core 61A and the B-phase first core 61B before assembling the A-phase stator set 30A and the B-phase stator set 30B, the A-phase first core 61A and In addition to being able to fix the B-phase first core 61B by welding, the A-phase first core 61A and the B-phase first core 61B can be The core 61B can be fixed at the boundary portion 35 by welding.

ここで、Ａ相用第１コア６１ＡおよびＢ相用第１コア６１Ｂを製作する工程では、所定形状に分割した磁性板に対して金型による絞り加工等を行って、Ａ相用極歯６１２Ａ、Ａ相用ケース部６１３Ａ、Ｂ相用極歯６１２Ｂ、Ｂ相用ケース部６１３Ｂが環状板部６１１Ａ、６１１Ｂから起立するように加工される。その結果、屈曲部６１６Ａの径方向外側の面、および屈曲部６１６Ｂの径方向外側の面の双方が、径方向外側に向けて凸状に湾曲した凸曲面になる。このような場合でも、本形態では、屈曲部６１６Ａと屈曲部６１６Ｂとの間で、Ｂ相用第１コア６１ＢとＡ相用第１コア６１Ａとが接する個所に向けてレーザビームを照射し、Ｂ相用第１コア６１ＢとＡ相用第１コア６１Ａとをレーザ溶接によって固定する。その際、レーザ溶接を周方向の複数箇所で行うため、第１溶接痕６６は、周方向で離間する複数箇所に存在する。従って、全周に溶接する場合より、作業効率を高めることができる。 Here, in the process of manufacturing the A-phase first core 61A and the B-phase first core 61B, a magnetic plate divided into predetermined shapes is subjected to drawing processing using a mold, and the A-phase pole tooth 612A is , the A-phase case portion 613A, the B-phase pole tooth 612B, and the B-phase case portion 613B are processed so as to stand up from the annular plate portions 611A and 611B. As a result, both the radially outer surface of the bent portion 616A and the radially outer surface of the bent portion 616B become convex curved surfaces that are convexly curved radially outward. Even in such a case, in this embodiment, the laser beam is irradiated toward the point where the B-phase first core 61B and the A-phase first core 61A touch between the bent part 616A and the bent part 616B, The B-phase first core 61B and the A-phase first core 61A are fixed by laser welding. At this time, since laser welding is performed at multiple locations in the circumferential direction, the first welding marks 66 are present at multiple locations spaced apart in the circumferential direction. Therefore, work efficiency can be improved compared to when welding the entire circumference.

このように本形態では、凸曲面からなる屈曲部６１６Ａ、６１６Ｂが接する部分で溶接を行うため、環状板部６１１Ａの外縁からＡ相用ケース部６１３Ａを屈曲させる際、および環状板部６１１Ｂの外縁からＢ相用ケース部６１３Ｂを屈曲させる際、凸曲面が発生しないような特別な折り曲げ加工や、追加の後加工を行わなくてもよい。 In this manner, in this embodiment, welding is performed at the portion where the bent portions 616A and 616B, which are convexly curved surfaces, are in contact with each other. When bending the B-phase case portion 613B, there is no need to perform a special bending process to prevent a convex curved surface from occurring or additional post-processing.

また、本形態において、複数のステータ３０の境界部３５では、周方向の一部で環状板部６１１Ｂと環状板部６１１Ａとが同士が接し、周方向の他の部分では、環状板部６１１Ｂと環状板部６１１Ａとの間に隙間が空いている態様であってもよい。かかる態様によれば、Ｂ相用第１コア６１ＢにＢ相用ケース部６１３Ｂを設ける工程や、Ａ相用第１コア６１ＡにＡ相用ケース部６１３Ａを設ける工程等において、環状板部６１１Ｂ、および環状板部６１１Ａがモータ軸線に対して直交する状態から斜めに傾いている場合には、環状板部６１１Ｂと環状板部６１１Ａとが周方向の全体で接する態様よりも、同軸度を優先し、環状板部６１１Ｂと環状板部６１１Ａとの間の周方向の一部に隙間が空いていることを許容する。従って、組立の際に複数のステータ３０の同軸度を確保しやすい。 Further, in this embodiment, in the boundary portion 35 of the plurality of stators 30, the annular plate portion 611B and the annular plate portion 611A are in contact with each other in a part in the circumferential direction, and in the other part in the circumferential direction, the annular plate portion 611B and the annular plate portion 611A are in contact with each other in a part in the circumferential direction. A gap may be provided between the annular plate portion 611A and the annular plate portion 611A. According to this aspect, in the step of providing the B-phase case portion 613B on the B-phase first core 61B, the step of providing the A-phase case portion 613A on the A-phase first core 61A, etc., the annular plate portion 611B, If the annular plate portion 611A is tilted obliquely from the state perpendicular to the motor axis, coaxiality is given priority over the manner in which the annular plate portion 611B and the annular plate portion 611A are in contact with each other in the entire circumferential direction. , a gap is allowed to exist in a part of the circumferential direction between the annular plate portion 611B and the annular plate portion 611A. Therefore, it is easy to ensure the coaxiality of the plurality of stators 30 during assembly.

ここで、Ａ相用第１コア６１ＡおよびＢ相用第１コア６１Ｂを製作する工程では、薄板化工程等を利用して、Ａ相用極歯６１２ＡおよびＢ相用極歯６１２Ｂの板厚が環状板部６１１Ａ、６１１Ｂの板厚より薄く、Ａ相用ケース部６１３ＡおよびＢ相用ケース部６１３Ｂの板厚がＡ相用極歯６１２ＡおよびＢ相用極歯６１２Ｂの板厚より薄くすることが好ましい。かかる構成において、Ａ相用極歯６１２ＡおよびＢ相用極歯６１２Ｂの板厚と環状板部６１１Ａ、６１１Ｂの板厚との差がコイル線の線径より大きく、Ａ相用ケース部６１３ＡおよびＢ相用ケース部６１３Ｂの板厚とＡ相用極歯６１２ＡおよびＢ相用極歯６１２Ｂの板厚との差がコイル線の線径より大きければ、コイル線を巻回するスペースを広く確保することができる。従って、コイル線の巻回数を増やすことができるので、トルクの増大を図ることができる。例えば、本形態では、環状板部６１１Ａ、６１１Ｂの板厚が０．３５ｍｍであり、Ａ相用極歯６１２ＡおよびＢ相用極歯６１２Ｂの板厚が０．２３ｍｍであり、Ａ相用ケース部６１３ＡおよびＢ相用ケース部６１３Ｂの板厚が０．２０ｍｍであり、コイル線の線径が０．０５５ｍｍである。 Here, in the process of manufacturing the A-phase first core 61A and the B-phase first core 61B, the plate thickness of the A-phase pole tooth 612A and the B-phase pole tooth 612B is reduced by using a thinning process or the like. The thickness of the annular plate portions 611A and 611B is thinner than that of the A-phase case portion 613A and the B-phase case portion 613B. preferable. In this configuration, the difference between the thickness of the A-phase pole tooth 612A and the B-phase pole tooth 612B and the thickness of the annular plate portions 611A, 611B is larger than the wire diameter of the coil wire, and the A-phase case portion 613A and B If the difference between the plate thickness of the phase case portion 613B and the plate thicknesses of the A-phase pole tooth 612A and the B-phase pole tooth 612B is larger than the wire diameter of the coil wire, a large space for winding the coil wire can be secured. I can do it. Therefore, since the number of turns of the coil wire can be increased, torque can be increased. For example, in this embodiment, the plate thickness of the annular plate parts 611A and 611B is 0.35 mm, the plate thickness of the A-phase pole tooth 612A and the B-phase pole tooth 612B is 0.23 mm, and the A-phase case part The thickness of the case portion 613A and the B-phase case portion 613B is 0.20 mm, and the wire diameter of the coil wire is 0.055 mm.

（ステータ３０内での固定構造等）
本形態では、複数のステータ３０の各々において、Ａ相用第１コア６１ＡとＢ相用第１コア６１Ｂとが固定されている。より具体的には、複数のステータ３０の各々において、Ａ相用第１コア６１ＡとＢ相用第１コア６１Ｂとが溶接により固定されている。本形態では、Ａ相用ケース部６１３Ａの先端部６１５ＡとＢ相用ケース部６１３Ｂの先端部６１５Ｂとがモータ軸線方向Ｌで当接していることから、Ａ相用ケース部６１３Ａの先端部６１５ＡとＢ相用ケース部６１３Ｂの先端部６１５Ｂとをレーザ溶接により固定する。それ故
、複数のステータ３０の各々において、Ａ相用第１コア６１ＡとＢ相用第１コア６１Ｂとをレーザ溶接により固定した際の第２溶接痕６７が、Ａ相用ケース部６１３Ａの先端部６１５Ａの径方向外側の面、およびＢ相用ケース部６１３Ｂの先端部６１５Ｂの径方向外側の面に跨るように存在している。ここで、第２溶接痕６７は、周方向で離間する複数箇所に存在する。従って、全周に溶接する場合より、作業効率を高めることができる。かかる固定構造を採用するにあたって、本形態では、Ｂ相用第１コア６１ＢのＢ相用ケース部６１３Ｂに形成したＢ相用開口部６１４Ｂ（切り欠き）と、Ａ相用第１コア６１ＡのＡ相用ケース部６１３Ａに形成したＡ相用開口部６１４Ａ（切り欠き）とを証にして、Ｂ相用第１コア６１ＢとＡ相用第１コア６１Ａとの周方向の位置を合せる。 (Fixed structure within stator 30, etc.)
In this embodiment, in each of the plurality of stators 30, the A-phase first core 61A and the B-phase first core 61B are fixed. More specifically, in each of the plurality of stators 30, the A-phase first core 61A and the B-phase first core 61B are fixed by welding. In this embodiment, since the tip 615A of the A-phase case section 613A and the tip 615B of the B-phase case section 613B are in contact with each other in the motor axis direction L, the tip 615A of the A-phase case section 613A The distal end portion 615B of the B-phase case portion 613B is fixed by laser welding. Therefore, in each of the plurality of stators 30, the second welding mark 67 when the A-phase first core 61A and the B-phase first core 61B are fixed by laser welding is the tip of the A-phase case portion 613A. It exists so as to straddle the radially outer surface of the portion 615A and the radially outer surface of the tip portion 615B of the B-phase case portion 613B. Here, the second welding marks 67 are present at a plurality of locations spaced apart in the circumferential direction. Therefore, work efficiency can be improved compared to when welding the entire circumference. In adopting such a fixing structure, in this embodiment, the B-phase opening 614B (notch) formed in the B-phase case portion 613B of the B-phase first core 61B and the A Using the A-phase opening 614A (notch) formed in the phase case portion 613A as evidence, align the circumferential positions of the B-phase first core 61B and the A-phase first core 61A.

さらに、本形態では、Ａ相用第２コア６２Ａの突出部６２８Ａ、およびＢ相用第２コア６２Ｂの突出部６２８Ｂは、モータ軸線方向Ｌで重なった状態で、Ａ相用ケース部６１３ＡおよびＢ相用ケース部６１３Ｂの切り欠き６１８Ａ、６１８Ｂから露出した状態にある。従って、Ａ相用第２コア６２Ａの突出部６２８ＡとＡ相用ケース部６１３Ａとをレーザ溶接によって固定することができ、Ｂ相用第２コア６２Ｂの突出部６２８ＢとＢ相用ケース部６１３Ｂとをレーザ溶接によって固定することができる。 Furthermore, in this embodiment, the protruding part 628A of the A-phase second core 62A and the protruding part 628B of the B-phase second core 62B overlap in the motor axis direction L, and the A-phase case part 613A and B It is in a state where it is exposed from the notches 618A and 618B of the companion case part 613B. Therefore, the protruding part 628A of the second core 62A for A-phase and the case part 613A for A-phase can be fixed by laser welding, and the protruding part 628B of the second core 62B for B-phase and the case part 613B for B-phase can be fixed by laser welding. It can be fixed by laser welding.

なお、Ａ相用第２コア６２Ａの突出部６２８ＡおよびＢ相用第２コア６２Ｂの突出部６２８Ｂについては、Ａ相用ステータ組３０ＡやＢ相用ステータ組３０Ｂを組み立てる前のＡ相用第２コア６２ＡおよびＢ相用第２コア６２Ｂの状態でレーザ溶接によって固定できる他、Ａ相用ステータ組３０ＡやＢ相用ステータ組３０Ｂを組み立てた後であっても、突出部６２８Ａ、６２８Ｂをレーザ溶接によって固定することができる。 In addition, regarding the protruding part 628A of the A-phase second core 62A and the protruding part 628B of the B-phase second core 62B, In addition to being able to fix the core 62A and the B-phase second core 62B by laser welding, the protrusions 628A and 628B can be laser welded even after the A-phase stator assembly 30A and the B-phase stator assembly 30B are assembled. It can be fixed by

このように本形態では、複数のステータ３０の各々においてモータ軸線方向Ｌの両側に位置するＡ相用第１コア６１ＡとＢ相用第１コア６１Ｂとを固定し、複数のステータ３０の境界部３５で重なるＢ相用第１コア６１ＢとＡ相用第１コア６１Ａとを固定したため、ステータ組を別体のケースに収容しなくても、組立の際にステータ組の同軸度を確保しやすい。それ故、モータの細径化を図りやすい。 In this manner, in this embodiment, the A-phase first core 61A and the B-phase first core 61B located on both sides of the motor axis direction L in each of the plurality of stators 30 are fixed, and the boundary between the plurality of stators 30 is fixed. Since the B-phase first core 61B and the A-phase first core 61A, which overlap at 35, are fixed, it is easy to ensure the coaxiality of the stator assembly during assembly without having to house the stator assembly in a separate case. . Therefore, it is easy to reduce the diameter of the motor.

［別の実施形態］
図７は、本発明の別の実施形態に係るステッピングモータ１の説明図である。なお、本形態の基本的な構成は、図３等を参照し説明した構成と同様である。従って、共通する部分には同一の符号を付してそれらの説明を省略する。図３等を参照して説明したステッピングモータ１では、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとは、第１コア、コイルボビン、および第２コアのモータ軸線方向Ｌにおける相対位置が逆向きであったが、本形態では、図７に示すように、いずれのステータ３０でも、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとにおいて、第１コア、コイルボビン、および第２コアのモータ軸線方向Ｌにおける相対位置が同一である。より具体的には、Ａ相用ステータ組３０Ａでは、モータ軸線方向Ｌの出力側Ｌａから反出力側Ｌｂに向かって、Ａ相用第２コア６２Ａ、Ａ相用コイルボビン５０Ａ、およびＡ相用第１コア６１Ａが順に配置され、Ｂ相用ステータ組３０Ｂでは、モータ軸線方向Ｌの出力側Ｌａから反出力側Ｌｂに向かって、Ｂ相用第２コア６２Ｂ、Ｂ相用コイルボビン５０Ｂ、およびＢ相用第１コア６１Ｂが順に配置されている。従って、各ステータ組の境界、およびステータ３０の境界において、Ａ相用ケース部６１３ＡとＢ相用ケース部６１３Ｂとを溶接によって固定するにあたっては、一方のケース部の先端部と、他方のケースの屈曲部の外側の面とを溶接により固定する。例えば、Ｂ相用ケース部６１３Ｂの先端部６１５Ｂと、Ａ相用ケース部６１３Ａの屈曲部６１６Ａの外側の面とを溶接により固定する。 [Another embodiment]
FIG. 7 is an explanatory diagram of a stepping motor 1 according to another embodiment of the present invention. Note that the basic configuration of this embodiment is the same as the configuration described with reference to FIG. 3 and the like. Therefore, common parts are given the same reference numerals and their explanation will be omitted. In the stepping motor 1 described with reference to FIG. 3, etc., the A-phase stator set 30A and the B-phase stator set 30B have opposite relative positions of the first core, coil bobbin, and second core in the motor axial direction L. However, in this embodiment, as shown in FIG. 7, in both stators 30, the A-phase stator set 30A and the B-phase stator set 30B, the first core, coil bobbin, and second core are The relative positions in the motor axis direction L are the same. More specifically, in the A-phase stator set 30A, the A-phase second core 62A, the A-phase coil bobbin 50A, and the A-phase second core 62A, the A-phase coil bobbin 50A, and the 1 core 61A is arranged in order, and in the B-phase stator set 30B, from the output side La in the motor axis direction L toward the opposite output side Lb, the B-phase second core 62B, the B-phase coil bobbin 50B, and the B-phase The first cores 61B are arranged in this order. Therefore, when fixing the A-phase case part 613A and the B-phase case part 613B by welding at the boundary of each stator group and the boundary of the stator 30, it is necessary to The outside surface of the bent part is fixed by welding. For example, the tip portion 615B of the B-phase case portion 613B and the outer surface of the bent portion 616A of the A-phase case portion 613A are fixed by welding.

［他の実施の形態］
上記実施形態においては、Ａ相用端子台５５ＡをＡ相用コイルボビン５０Ａの反出力側
Ｌｂのフランジ部５２Ａに設け、Ｂ相用端子台５５ＢをＢ相用コイルボビン５０Ｂの反出力側Ｌｂのフランジ部５１Ｂに設けたが、Ａ相用端子台５５ＡをＡ相用コイルボビン５０Ａの出力側Ｌａのフランジ部５１Ａに設け、Ｂ相用端子台５５ＢをＢ相用コイルボビン５０Ｂの出力側Ｌａのフランジ部５２Ｂに設けてもよい。 [Other embodiments]
In the above embodiment, the A-phase terminal block 55A is provided on the flange portion 52A on the opposite output side Lb of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion on the opposite output side Lb of the B-phase coil bobbin 50B. 51B, the A-phase terminal block 55A is provided on the flange portion 51A of the output side La of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion 52B of the output side La of the B-phase coil bobbin 50B. It may be provided.

また、Ａ相用端子台５５ＡをＡ相用コイルボビン５０Ａの反出力側Ｌｂのフランジ部５２Ａに設け、Ｂ相用端子台５５ＢをＢ相用コイルボビン５０Ｂの出力側Ｌａのフランジ部５２Ｂに設けた態様や、Ａ相用端子台５５ＡをＡ相用コイルボビン５０Ａの出力側Ｌａのフランジ部５１Ａに設け、Ｂ相用端子台５５ＢをＢ相用コイルボビン５０Ｂの反出力側Ｌｂのフランジ部５１Ｂに設けた態様であってもよい。 In addition, the A-phase terminal block 55A is provided on the flange portion 52A on the opposite output side Lb of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion 52B on the output side La of the B-phase coil bobbin 50B. Or, an embodiment in which the A-phase terminal block 55A is provided on the flange portion 51A on the output side La of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion 51B on the opposite output side Lb of the B-phase coil bobbin 50B. It may be.

また、Ａ相用端子台５５ＡをＡ相用コイルボビン５０Ａの反出力側Ｌｂのフランジ部５２Ａに設け、Ｂ相用端子台５５ＢをＢ相用コイルボビン５０Ｂの出力側Ｌａのフランジ部５２Ｂに設けた場合、Ａ相用端子台５５ＡとＢ相用端子台５５Ｂとはモータ軸線方向Ｌで重なる。この場合、Ａ相用端子ピン５６ＡとＢ相用端子ピン５６Ｂとがモータ軸線を中心とする同一の角度位置に設けられた態様、あるいはＡ相用端子ピン５６ＡとＢ相用端子ピン５６Ｂとがモータ軸線を中心とする異なる角度位置に設けられた態様のいずれであってもよい。 In addition, when the A-phase terminal block 55A is provided on the flange portion 52A on the opposite output side Lb of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion 52B on the output side La of the B-phase coil bobbin 50B. , the A-phase terminal block 55A and the B-phase terminal block 55B overlap in the motor axis direction L. In this case, the A-phase terminal pin 56A and the B-phase terminal pin 56B may be provided at the same angular position centering on the motor axis, or the A-phase terminal pin 56A and the B-phase terminal pin 56B may be It may be provided in any of the embodiments provided at different angular positions centering on the motor axis.

また、Ａ相用端子台５５ＡをＡ相用コイルボビン５０Ａの反出力側Ｌｂのフランジ部５２Ａに設け、Ｂ相用端子台５５ＢをＢ相用コイルボビン５０Ｂの出力側Ｌａのフランジ部５２Ｂに設けた場合、Ａ相用端子台５５ＡにおいてＡ相用端子ピン５６Ａを設けた部分と、Ｂ相用端子台５５ＢにおいてＢ相用端子ピン５６Ｂを設けた部分とが周方向で隣り合う態様であってもよい。 In addition, when the A-phase terminal block 55A is provided on the flange portion 52A on the opposite output side Lb of the A-phase coil bobbin 50A, and the B-phase terminal block 55B is provided on the flange portion 52B on the output side La of the B-phase coil bobbin 50B. , the part where the A-phase terminal pin 56A is provided in the A-phase terminal block 55A and the part where the B-phase terminal pin 56B is provided in the B-phase terminal block 55B may be adjacent in the circumferential direction. .

また、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとにおいて、Ａ相用端子台５５ＡおよびＢ相用端子台５５Ｂがモータ軸線を中心とする異なる角度位置に設けられた態様であってもよい。この場合、Ａ相用ステータ組３０ＡとＢ相用ステータ組３０Ｂとにおいて、Ａ相用開口部６１４ＡおよびＢ相用開口部６１４Ｂをモータ軸線を中心とする異なる角度位置に設ける。 Furthermore, in the A-phase stator set 30A and the B-phase stator set 30B, even if the A-phase terminal block 55A and the B-phase terminal block 55B are provided at different angular positions around the motor axis, good. In this case, in the A-phase stator set 30A and the B-phase stator set 30B, the A-phase opening 614A and the B-phase opening 614B are provided at different angular positions with respect to the motor axis.

また、第１ステータ３１と第２ステータ３２とにおいて、Ａ相用端子台５５ＡおよびＢ相用端子台５５Ｂがモータ軸線を中心とする異なる角度位置に設けられた態様であってもよい。この場合、第１ステータ３１と第２ステータ３２とにおいて、Ａ相用開口部６１４ＡおよびＢ相用開口部６１４Ｂをモータ軸線を中心とする異なる角度位置に設ける。 Further, in the first stator 31 and the second stator 32, the A-phase terminal block 55A and the B-phase terminal block 55B may be provided at different angular positions with respect to the motor axis. In this case, in the first stator 31 and the second stator 32, the A-phase opening 614A and the B-phase opening 614B are provided at different angular positions about the motor axis.

上記実施形態において、複数のステータ３０において、２つのステータ組の一方がＡ相用であり、他方がＢ相用であったが、複数のステータ３０の一部がＡ相用であり、他の一部がＢ相用である場合に本発明を適用してもよい。また、複数のステータ３０において、２つのステータ組が同一相である場合に本発明を適用してもよい。 In the above embodiment, in the plurality of stators 30, one of the two stator sets was for the A phase and the other was for the B phase, but some of the plurality of stators 30 were for the A phase and the other The present invention may be applied in a case where a part is for B phase. Moreover, in a plurality of stators 30, the present invention may be applied when two stator sets have the same phase.

上記実施形態において、ステータ部３に４組のステータ組が設けられていたが、５組以上のステータ組が設けられている場合に本発明を適用してもよい。 In the above embodiment, the stator unit 3 is provided with four stator sets, but the present invention may be applied to a case where five or more stator sets are provided.

上記実施形態において、ロータ２では、永久磁石２２が複数の磁石２２０からなる態様であったが、永久磁石２２が１つの磁石からなる態様であってもよい。 In the embodiment described above, in the rotor 2, the permanent magnet 22 is composed of a plurality of magnets 220, but the permanent magnet 22 may be composed of one magnet.

１…ステッピングモータ、２…ロータ、３…ステータ部、３０…ステータ、２１…回転軸、２２…永久磁石、３０Ａ…Ａ相用ステータ組、３０Ｂ…Ｂ相用ステータ組、３１…第１
ステータ、３２…第２ステータ、３５…境界部、４０Ａ…Ａ相用コイル、４０Ｂ…Ｂ相用コイル、５０Ａ…Ａ相用コイルボビン、５０Ｂ…Ｂ相用コイルボビン、５１Ａ、５１Ｂ、５２Ａ、５２Ｂ…フランジ部、５５Ａ…Ａ相用端子台、５５Ｂ…Ｂ相用端子台、５６Ａ…Ａ相用端子ピン、５６Ｂ…Ｂ相用端子ピン、６１Ａ…Ａ相用第１コア、６１Ｂ…Ｂ相用第１コア、６２Ａ…Ａ相用第２コア、６２Ｂ…Ｂ相用第２コア、６６…第１溶接痕、６７…第２溶接痕、２２０…磁石、２２１…第１磁石、２２２…第２磁石、６１１Ａ…環状板部（Ａ相用環状板部）、６１１Ｂ…環状板部（Ｂ相用環状板部）、６２１Ａ、６２１Ｂ…環状板部、６１２Ａ、６２２Ａ…Ａ相用極歯、６１２Ｂ、６２２Ｂ…Ｂ相用極歯、６１３Ａ…Ａ相用ケース部、６１３Ｂ…Ｂ相用ケース部、６１４…開口部、６１４Ａ…Ａ相用開口部、６１４Ｂ…Ｂ相用開口部、６１５Ａ、６１５Ｂ…先端部、６１６Ａ、Ｌ…モータ軸線方向、Ｌａ…出力側、Ｌｂ…反出力側 DESCRIPTION OF SYMBOLS 1... Stepping motor, 2... Rotor, 3... Stator part, 30... Stator, 21... Rotating shaft, 22... Permanent magnet, 30A... Stator group for A phase, 30B... Stator group for B phase, 31... First
Stator, 32...Second stator, 35...Boundary part, 40A...A phase coil, 40B...B phase coil, 50A...A phase coil bobbin, 50B...B phase coil bobbin, 51A, 51B, 52A, 52B...flange 55A...Terminal block for A phase, 55B...Terminal block for B phase, 56A...Terminal pin for A phase, 56B...Terminal pin for B phase, 61A...1st core for A phase, 61B...1st core for B phase Core, 62A...Second core for A phase, 62B...Second core for B phase, 66...First welding mark, 67...Second welding mark, 220...Magnet, 221...First magnet, 222...Second magnet, 611A...Annular plate part (A-phase annular plate part), 611B...Annular plate part (B-phase annular plate part), 621A, 621B...Annular plate part, 612A, 622A...A-phase pole teeth, 612B, 622B... Pole tooth for B phase, 613A...Case part for A phase, 613B...Case part for B phase, 614...Opening part, 614A...Opening part for A phase, 614B...Opening part for B phase, 615A, 615B...Tip part, 616A, L...motor axis direction, La...output side, Lb...counter output side

Claims

a rotor that includes a permanent magnet on the outer circumferential side of a rotating shaft that extends in the motor axis direction;
a cylindrical stator portion arranged to face the permanent magnet radially outward;
has
In the stator section, a plurality of four or more stator sets in which a first core, a coil bobbin around which a coil is wound, and a second core are stacked in the motor axis direction are arranged in the motor axis direction,
In each of the plurality of stator sets, the first core includes an annular plate portion that overlaps the coil bobbin, and a cylinder that is bent at the outer edge of the annular plate portion and extends to a position that covers the second core from the outside in the radial direction. A case portion having a shape,
In the plurality of stator sets, the case parts are fixed to each other by welding ,
In the stator set, a plurality of stators each consisting of two stator sets that overlap in the motor axis direction are arranged in the motor axis direction,
In the two stator sets, the relative positions of the first core, the coil bobbin, and the second core in the motor axis direction are opposite, and the distal ends of the case parts of the two stator sets are welded together. fixed by
A stepping motor characterized in that, at a boundary between the plurality of stators, outer surfaces of the bent portion from the annular plate portion of the case portion are fixed to each other by welding.

a rotor that includes a permanent magnet on the outer circumferential side of a rotating shaft that extends in the motor axis direction;
a cylindrical stator portion arranged to face the permanent magnet radially outward;
has
In the stator section, a plurality of four or more stator sets in which a first core, a coil bobbin around which a coil is wound, and a second core are stacked in the motor axis direction are arranged in the motor axis direction,
In each of the plurality of stator sets, the first core includes an annular plate portion that overlaps the coil bobbin, and a cylinder that is bent at the outer edge of the annular plate portion and extends to a position that covers the second core from the outside in the radial direction. A case portion having a shape,
In the plurality of stator sets, the case parts are fixed to each other by welding,
In the stator set, a plurality of stators each consisting of two stator sets that overlap in the motor axis direction are arranged in the motor axis direction,
In the plurality of stator sets, the first core, the coil bobbin, and the second core have the same relative position in the motor axis direction,
At the boundary between the plurality of stator sets, of the two stator sets adjacent in the motor axis direction, the tip of the case part of one stator set and the annular plate part of the case part of the other stator set. A stepping motor characterized in that an outer surface of a bent portion of the stepping motor is fixed to the outer surface of the bent portion by welding.

In claim 1 ,
A stepping motor characterized in that, at a boundary between the plurality of stators, the annular plate parts touch each other in a part of the circumferential direction, and a gap is left between the annular plate parts in the other part of the circumferential direction. .

The stepping motor according to any one of claims 1 to 3 ,
A stepping motor characterized in that a radially outer surface of the bent portion is a convex curved surface that is convexly curved radially outward.

In any one of claims 1 to 4 ,
A stepping motor characterized in that, in each of the plurality of stator sets, the case portion is provided with a mark for circumferentially positioning adjacent stator sets in the motor axis direction.

In claim 5 ,
A stepping motor characterized in that in each of the plurality of stator sets, the proof is a notch formed in the case portion.

In claim 6 ,
The notch is an opening that extends over the entire axial direction of the case portion, and a terminal block formed on the coil bobbin protrudes radially outward from the opening.
A stepping motor, wherein the openings of the plurality of stator sets are connected in the axial direction of the motor.

The stepping motor according to any one of claims 1 to 7 ,
A stepping motor characterized in that, in each of the plurality of stators, one of the two stator sets is an A-phase stator set and the other is a B-phase stator set.

The stepping motor according to any one of claims 1 to 8 ,
A stepping motor characterized in that the plurality of stator parts have an outer diameter of 6 mm or less.

The stepping motor according to any one of claims 1 to 9 ,
The stepping motor is characterized in that the stator section has four stator groups as the plurality of stator groups.