WO2021161714A1 - Rotor core and rotary electric machine - Google Patents

Rotor core and rotary electric machine Download PDF

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Publication number
WO2021161714A1
WO2021161714A1 PCT/JP2021/001180 JP2021001180W WO2021161714A1 WO 2021161714 A1 WO2021161714 A1 WO 2021161714A1 JP 2021001180 W JP2021001180 W JP 2021001180W WO 2021161714 A1 WO2021161714 A1 WO 2021161714A1
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Prior art keywords
teeth
rotor core
slot
flat portion
curved
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PCT/JP2021/001180
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French (fr)
Japanese (ja)
Inventor
隆文 齋藤
康夫 齊藤
大介 山下
形次郎 岡部
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日立Astemo株式会社
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Application filed by 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to CN202180008215.6A priority Critical patent/CN114930684A/en
Priority to JP2022500277A priority patent/JP7390463B2/en
Publication of WO2021161714A1 publication Critical patent/WO2021161714A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/26—Rotor cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation

Definitions

  • the present invention relates to a rotary electric machine represented by a DC motor, and particularly to a rotor core configuration.
  • the brushed motor energizes the coil wound around the armature core and generates torque by acting with the magnetic field generated by the magnet.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2006-280172
  • the inner curvature center of the magnet arranged in the case of the DC motor is eccentric from the outer curvature center in the radial direction, and the inner curvature center of the tooth tip of the armature core.
  • a DC motor configured by eccentricity from the outer center of curvature toward the anti-tip portion (see summary).
  • the torque during rotation changes depending on the rotation angle of the motor, and this torque pulsation affects the controllability of the actuator, which causes deterioration of product characteristics such as deterioration of system response. Therefore, reduction of cogging torque is required.
  • the shape of the tip of the core teeth is changed by providing an eccentric amount in the inner peripheral portion of the core slot to adjust the flow of magnetic flux. Therefore, as the inner diameter eccentricity increases, the tip of the tooth becomes thinner, so that the freedom of adjusting the flow of magnetic flux is low, and the desired characteristics of the motor may not be obtained.
  • the rotor core of the rotary electric machine includes a slot portion in which the coil is wound and a teeth portion forming a space in which the coil is wound in the slot portion, and the slot on the inner peripheral side of the teeth portion.
  • the boundary portion with the portion is formed in a curved shape continuous with the flat portion via an inflection point provided at the boundary between the flat portion formed in a straight line perpendicular to the radial direction and the flat portion. It is formed by a curved portion, and the curved portion is characterized in that it is located at the tip of the flat portion in the circumferential direction of the teeth portion.
  • the flow of magnetic flux at the tip of the tooth can be adjusted. Issues, configurations and effects other than those mentioned above will be clarified by the description of the following examples.
  • FIG. 1 is a cross-sectional view showing the structure of the DC motor 1 of this embodiment, and shows a vertical cross section cut along the shaft 5.
  • FIG. 2 is an exploded perspective view of the DC motor 1 of this embodiment.
  • the DC motor 1 generates rotational torque by supplying power to the external power supply terminals 26, and transmits the torque to the system side via the attached motor gear 19.
  • the DC motor 1 has a case and a yoke 2 that has a role of forming a magnetic circuit.
  • a magnet stay 27 and a plurality of magnets 3 are mounted on the inner surface of the yoke 2 to generate magnetic flux as a permanent magnet.
  • the armature 4 is housed while holding an arbitrary gap with the inner surface of the magnet 3.
  • a shaft 5 connected to the motor gear 19 is provided at the radial center portion of the armature 4.
  • the shaft 5 is rotatably supported by the front bracket 7 and the rear bracket 21 via the bearing 6 and the bearing 20, and outputs the torque generated by the armature core 8 and the magnet 3.
  • the front bracket 7 and the rear bracket 21 are attached to the yoke 2.
  • the armature 4 is configured by fixing the armature core 8 and the commutator 9 to the shaft 5.
  • the armature coil 11 is wound across a plurality of slots 10 formed on the outer peripheral portion of the armature core 8 in the circumferential direction.
  • the commutator 9 is formed in a tubular shape by an insulating material such as resin, and a plurality of commutator pieces 12 made of a conductive material are provided on the outer peripheral portion of the commutator 9.
  • An armature coil 11 wound between the slots 10 is electrically joined to the commutator piece 12.
  • the brush holder 13 is housed inside the yoke 2. At least a pair of brushes 14 and springs 15 for supplying power to the commutator piece 12 are arranged in the brush holder 13. A choke coil 16 for removing electromagnetic noise is further arranged on the brush holder 13.
  • the brush 14 is electrically connected to the external power supply terminal 26 of the DC motor 1.
  • the brush 14 is slidably contacted with the outer peripheral surface of the commutator piece 12 by the elasticity of the spring 15 held by the brush holder 13, and supplies power to the armature coil 11 via the commutator piece 12.
  • the external power supply terminal 26 and the armature coil 11 are electrically connected to form a circuit.
  • FIG. 3 is a perspective view showing the structure of the armature core 8 of this embodiment.
  • the armature core 8 is formed by laminating soft magnetic metal plates such as electromagnetic steel plates, and is provided with a slot 10 which is a groove for winding the armature coil 11 and a tooth 81 which constitutes a magnetic path through which magnetic flux passes.
  • the teeth 81 is formed in a T shape by a radial extending portion extending in the radial direction from the center of rotation and a circumferential extending portion extending left and right in the circumferential direction at the tip of the radial extending portion.
  • the adjacent teeth 81 are interrupted by the slot opening 82 on the outer peripheral side, and the slot 10 communicates with the outside in the radial direction by the slot opening 82.
  • the armature core 8 shown in the figure has an oblique groove (skew) type in which the slot opening 82 is diagonally provided, and reduces torque fluctuations due to rotation of the motor.
  • the slot 10 is formed as a space between adjacent teeth 81, and the number of slots is the number of armature cores 8 divided in the circumferential direction by the teeth 81.
  • FIG. 4 is a cross-sectional view showing the structure of the DC motor 1 of this embodiment, and mainly shows the shape of the teeth 81 using a cross section cut along a plane perpendicular to the shaft 5.
  • the outer peripheral side of the teeth 81 is formed by a predetermined arc centered on the shaft 5 so as to hold an arbitrary gap with the inner surface of the magnet 3. Further, the inner peripheral side of the teeth 81 (the boundary surface on the outer peripheral side of the slot 10) is formed by a flat portion 83 formed in a straight line perpendicular to the radial direction of the teeth 81 and a curve having a curvature different from that of the flat portion 83. It is composed of a curved portion 84. The flat portion 83 and the curved portion 84 are continuously connected, and an inflection point 85 whose curvature changes is formed at the boundary thereof.
  • the flat portion 83 and the curved portion 84 are formed evenly on the left and right sides, with the flat portion 83 on the inside and the curved portion 84 on the outside when viewed from the radial center line of each tooth 81.
  • the flat portion 83 is ideally formed in a straight line perpendicular to the radial direction of the teeth 81, but an error in a predetermined range from the vertical straight line (for example, unevenness or inclination of ⁇ 0.2 mm). May be tolerated.
  • This predetermined error may be determined by the radial width of the circumferentially stretched portion of the teeth 81, the thickness of the electromagnetic steel plate constituting the armature core 8, and the like.
  • the curved portion 84 is formed by a curved surface having a curvature different from that of the flat portion 83, but ideally, it is preferably formed in a concentric circle centered on the rotation axis.
  • the flat portion 83 is provided inside the tip portion of the teeth 81 and the outside of the inflection point 85 is formed by the curved portion 84, the width of the circumferential extension portion of the tip portion of the teeth 81 is the teeth 81. Since it widens at a position close to the radial extension portion and narrows at a position far from the radial extension portion, the flow of magnetic flux passing through the tip portion of the teeth 81 can be adjusted and the cogging torque can be reduced.
  • the radial width of the portion of the T-shaped circumferentially stretched portion close to the radially stretched portion is widened, the magnetic flux passing through the armature core 8 reaches the tip of the circumferentially stretched portion, and the slot The decrease in magnetic flux density at the position of the opening 82 can be suppressed, and the cogging torque can be reduced.
  • the width of the circumferentially stretched portion in the radial direction is widened, the space factor of the armature coil 11 decreases, and the torque decreases. Therefore, the range of the flat portion 83 is adjusted to reduce the cogging torque and suppress the decrease in torque.
  • ⁇ is an angle obtained by dividing the angle occupied by the entire circumference of the magnet 3 by the number of slots, and is a parameter representing the angle occupied by the magnet 3 per slot.
  • FIG. 5 is a diagram showing the effect of the armature core 8 of this embodiment, and is a diagram showing a change in cogging torque when the range of the flat portion 83 changes.
  • the boundary portion of the teeth 81 with the slot 10 on the inner peripheral side is a turning point provided at the boundary between the flat portion 83 formed in a straight line perpendicular to the radial direction and the flat portion 83.
  • the flat portion 83 is formed through the flat portion 83 and the curved portion 84 formed in a continuous curved shape. Since the curved portion 84 is located at the tip of the flat portion 83 in the circumferential direction of the teeth 81, the tip of the teeth 81 is formed.
  • the magnetic flow of the portion can be changed to adjust the magnetic change that occurs when the electric motor rotates, the amount of magnetic force at the end of the tooth 81 can be increased, and the cogging torque can be reduced while suppressing the decrease in torque.
  • the width of the tip portion of the teeth 81 in the radial direction is not reduced, and the DC motor 1 is centrifuged at the time of rotation. Deformation of the armature core 8 due to force can be suppressed. Further, the degree of freedom in adjusting the opening width of the slot opening 82 can be improved. Therefore, the tip of the teeth 81 is not sharpened, and the armature coil 11 can be prevented from being scratched by being caught by the armature core 8 when the coil is wound.
  • the present invention is not limited to the above-described embodiment, and includes various modifications and equivalent configurations within the scope of the appended claims.
  • the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the described configurations.
  • a part of the configuration of one embodiment may be replaced with the configuration of another embodiment.
  • the configuration of another embodiment may be added to the configuration of one embodiment.
  • other configurations may be added / deleted / replaced with respect to a part of the configurations of each embodiment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc Machiner (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

According to the present invention, the flow of magnetic flux at the tip part of teeth is adjusted.　Provided is a rotor core of a rotary electric machine, comprising: a slot part where a coil is wound; and a teeth part forming a space for winding the coil in the slot part, wherein a boundary part with the slot part on the inner peripheral side of the teeth part has a flat part formed in a straight line perpendicular to the radial direction, and a curved part formed in a curved shape continuous with the flat part, via an inflection point provided at the boundary with the flat part, and the curved part is positioned at the tip of the flat part in the circumferential direction of the teeth part.

Description

ロータコア及び回転電機Rotor core and rotary electric machine
　本発明は、直流電動機に代表される回転電機に関し、特にロータコアの構成に関する。 The present invention relates to a rotary electric machine represented by a DC motor, and particularly to a rotor core configuration.
　ブラシ付きモータは、アーマチャコアに巻回されたコイルへ通電し、磁石が発生する磁界との作用によってトルクを発生する。本技術分野の背景技術として、特開２００６－２８０１７２号公報（特許文献１）がある。特開２００６－２８０１７２号公報には、直流モータのケース内に配置されたマグネットの内側曲率中心を、その外側曲率中心より放射方向へ偏心させると共に、電機子のコアのティース先端部の内側曲率中心を、その外側曲率中心より当該反先端部方向へ偏心させて構成する直流モータが記載されている（要約参照）。 The brushed motor energizes the coil wound around the armature core and generates torque by acting with the magnetic field generated by the magnet. As a background technique in this technical field, there is Japanese Patent Application Laid-Open No. 2006-280172 (Patent Document 1). According to Japanese Patent Application Laid-Open No. 2006-280172, the inner curvature center of the magnet arranged in the case of the DC motor is eccentric from the outer curvature center in the radial direction, and the inner curvature center of the tooth tip of the armature core. Is described as a DC motor configured by eccentricity from the outer center of curvature toward the anti-tip portion (see summary).
特開２００６－２８０１７２号公報Japanese Unexamined Patent Publication No. 2006-280172
　ブラシ付きモータでは、回転時のトルクはモータの回転角で変化し、このトルク脈動がアクチュエータの制御性に影響を与え、システム応答の悪化など、製品性を低下させる要因となる。このため、コギングトルクの低減が求められている。前述した背景技術では、コアスロット内周部に偏心量を設けることによって、コアティース先端部の形状を変えて、磁束の流れを調節している。このため、内径偏心量が大きくなるとティース先端部が細くなるため、磁束の流れの調節の自由が低く、モータの所望の特性が得られないことがある。 In a brushed motor, the torque during rotation changes depending on the rotation angle of the motor, and this torque pulsation affects the controllability of the actuator, which causes deterioration of product characteristics such as deterioration of system response. Therefore, reduction of cogging torque is required. In the background technique described above, the shape of the tip of the core teeth is changed by providing an eccentric amount in the inner peripheral portion of the core slot to adjust the flow of magnetic flux. Therefore, as the inner diameter eccentricity increases, the tip of the tooth becomes thinner, so that the freedom of adjusting the flow of magnetic flux is low, and the desired characteristics of the motor may not be obtained.
　本願において開示される発明の代表的な一例を示せば以下の通りである。すなわち、回転電機のロータコアであって、コイルが巻回されるスロット部と、前記スロット部にコイルが巻回される空間を形成するティース部とを備え、前記ティース部の内周側の前記スロット部との境界部は、径方向に垂直な直線状に形成されるフラット部と、前記フラット部との境界に設けられる変曲点を介して、前記フラット部と連続する曲線状に形成される曲線部とで形成され、前記曲線部は、前記ティース部の周方向において前記フラット部より先端に位置することを特徴とする。 A typical example of the invention disclosed in the present application is as follows. That is, the rotor core of the rotary electric machine includes a slot portion in which the coil is wound and a teeth portion forming a space in which the coil is wound in the slot portion, and the slot on the inner peripheral side of the teeth portion. The boundary portion with the portion is formed in a curved shape continuous with the flat portion via an inflection point provided at the boundary between the flat portion formed in a straight line perpendicular to the radial direction and the flat portion. It is formed by a curved portion, and the curved portion is characterized in that it is located at the tip of the flat portion in the circumferential direction of the teeth portion.
　本発明によれば、ティースの先端部の磁束の流れを調整できる。前述した以外の課題、構成及び効果は、以下の実施例の説明によって明らかにされる。 According to the present invention, the flow of magnetic flux at the tip of the tooth can be adjusted. Issues, configurations and effects other than those mentioned above will be clarified by the description of the following examples.
本発明の実施例の直流電動機の構造を示す縦断面図である。It is a vertical sectional view which shows the structure of the DC motor of the Example of this invention. 本発明の実施例の直流電動機の分解斜視図である。It is an exploded perspective view of the DC motor of the Example of this invention. 本発明の実施例のアーマチャコアの構造を示す斜視図である。It is a perspective view which shows the structure of the armature core of the Example of this invention. 本発明の実施例の直流電動機の構造を示す横断面図である。It is sectional drawing which shows the structure of the DC motor of the Example of this invention. 本発明の実施例のアーマチャコアによる効果を示す図である。It is a figure which shows the effect by the armature core of the Example of this invention.
　以下、図１～図５を参照して、回転電機のうち代表的な直流電動機の実施例を説明する。 Hereinafter, examples of typical DC motors among rotary electric machines will be described with reference to FIGS. 1 to 5.
　図１は、本実施例の直流電動機１の構造を示す断面図であり、シャフト５に沿って切断した縦断面を示す。図２は、本実施例の直流電動機１の分解斜視図である。 FIG. 1 is a cross-sectional view showing the structure of the DC motor 1 of this embodiment, and shows a vertical cross section cut along the shaft 5. FIG. 2 is an exploded perspective view of the DC motor 1 of this embodiment.
　直流電動機１は、外部給電端子２６間への給電によって回転トルクを発生し、取付けられたモータギア１９を介してシステム側へトルクを伝える。直流電動機１は、ケース及び磁気回路を形成する役割を有するヨーク２を有する。ヨーク２の内面にはマグネットステー２７及び複数個のマグネット３が装着され、永久磁石として磁束を発生する。更にマグネット３の内側には、マグネット３の内面と任意の隙間を保持してアーマチャ４が収容される。アーマチャ４の径方向中央部にはモータギア１９に接続されたシャフト５が備えられる。シャフト５は、軸受６及び軸受２０を介してフロントブラケット７及びリアブラケット２１に回転自在に支持され、アーマチャコア８とマグネット３で発生するトルクを出力する。フロントブラケット７及びリアブラケット２１はヨーク２に取り付けられる。アーマチャ４は、シャフト５にアーマチャコア８及び整流子９が固定されて構成される。アーマチャコア８の周方向外周部に形成された複数のスロット１０間に跨ってアーマチャコイル１１が巻回される。整流子９は樹脂等の絶縁材により筒状に形成され、整流子９の外周部には導電材からなる複数の整流子片１２を備える。整流子片１２にはスロット１０間に巻回されたアーマチャコイル１１が電気的に接合される。 The DC motor 1 generates rotational torque by supplying power to the external power supply terminals 26, and transmits the torque to the system side via the attached motor gear 19. The DC motor 1 has a case and a yoke 2 that has a role of forming a magnetic circuit. A magnet stay 27 and a plurality of magnets 3 are mounted on the inner surface of the yoke 2 to generate magnetic flux as a permanent magnet. Further, inside the magnet 3, the armature 4 is housed while holding an arbitrary gap with the inner surface of the magnet 3. A shaft 5 connected to the motor gear 19 is provided at the radial center portion of the armature 4. The shaft 5 is rotatably supported by the front bracket 7 and the rear bracket 21 via the bearing 6 and the bearing 20, and outputs the torque generated by the armature core 8 and the magnet 3. The front bracket 7 and the rear bracket 21 are attached to the yoke 2. The armature 4 is configured by fixing the armature core 8 and the commutator 9 to the shaft 5. The armature coil 11 is wound across a plurality of slots 10 formed on the outer peripheral portion of the armature core 8 in the circumferential direction. The commutator 9 is formed in a tubular shape by an insulating material such as resin, and a plurality of commutator pieces 12 made of a conductive material are provided on the outer peripheral portion of the commutator 9. An armature coil 11 wound between the slots 10 is electrically joined to the commutator piece 12.
　ヨーク２の内部にはブラシホルダ１３が収容される。ブラシホルダ１３には、整流子片１２に給電する少なくとも一対のブラシ１４とバネ１５が配置される。ブラシホルダ１３にはさらに、電磁ノイズを除去するためのチョークコイル１６が配置される。ブラシ１４は直流電動機１の外部給電端子２６と電気的に接続される。ブラシ１４は、ブラシホルダ１３に保持されたバネ１５の弾性によって整流子片１２の外周面に摺接され、整流子片１２を介してアーマチャコイル１１に給電する。これによって、外部給電端子２６とアーマチャコイル１１が電気的に接続され、回路を形成する。 The brush holder 13 is housed inside the yoke 2. At least a pair of brushes 14 and springs 15 for supplying power to the commutator piece 12 are arranged in the brush holder 13. A choke coil 16 for removing electromagnetic noise is further arranged on the brush holder 13. The brush 14 is electrically connected to the external power supply terminal 26 of the DC motor 1. The brush 14 is slidably contacted with the outer peripheral surface of the commutator piece 12 by the elasticity of the spring 15 held by the brush holder 13, and supplies power to the armature coil 11 via the commutator piece 12. As a result, the external power supply terminal 26 and the armature coil 11 are electrically connected to form a circuit.
　図３は、本実施例のアーマチャコア８の構造を示す斜視図である。 FIG. 3 is a perspective view showing the structure of the armature core 8 of this embodiment.
　アーマチャコア８は、電磁鋼板などの軟磁性金属板を積層して構成され、アーマチャコイル１１を巻き回すための溝であるスロット１０と、磁束が通る磁路を構成するティース８１が設けられる。ティース８１は、回転中心から径方向に延伸する径方向延伸部と、径方向延伸部の先端で周方向左右に延伸する周方向延伸部とでＴ字形に形成されている。隣接するティース８１は外周側のスロット開口部８２によって途切れており、スロット１０はスロット開口部８２によって径方向に外部と連通している。図示するアーマチャコア８は、スロット開口部８２が斜めに設けられる斜溝（スキュー）型となっており、モータの回転に伴うトルク変動を低減している。 The armature core 8 is formed by laminating soft magnetic metal plates such as electromagnetic steel plates, and is provided with a slot 10 which is a groove for winding the armature coil 11 and a tooth 81 which constitutes a magnetic path through which magnetic flux passes. The teeth 81 is formed in a T shape by a radial extending portion extending in the radial direction from the center of rotation and a circumferential extending portion extending left and right in the circumferential direction at the tip of the radial extending portion. The adjacent teeth 81 are interrupted by the slot opening 82 on the outer peripheral side, and the slot 10 communicates with the outside in the radial direction by the slot opening 82. The armature core 8 shown in the figure has an oblique groove (skew) type in which the slot opening 82 is diagonally provided, and reduces torque fluctuations due to rotation of the motor.
　スロット１０は隣接するティース８１の間の空間として形成され、スロット数はアーマチャコア８がティース８１によって周方向に分割される数である。 The slot 10 is formed as a space between adjacent teeth 81, and the number of slots is the number of armature cores 8 divided in the circumferential direction by the teeth 81.
　図４は、本実施例の直流電動機１の構造を示す断面図であり、シャフト５に垂直な面で切断した横断面を用いて、主にティース８１の形状を示す。 FIG. 4 is a cross-sectional view showing the structure of the DC motor 1 of this embodiment, and mainly shows the shape of the teeth 81 using a cross section cut along a plane perpendicular to the shaft 5.
　ティース８１の外周側は、マグネット３の内面と任意の隙間を保持するようにシャフト５を中心とした所定の円弧で形成される。また、ティース８１の内周側（スロット１０の外周側の境界面）は、ティース８１の径方向に垂直な直線状に形成されるフラット部８３と、フラット部８３と異なる曲率の曲線で形成される曲線部８４で構成されている。フラット部８３と曲線部８４とは連続的に接続されており、その境界には曲率が変化する変曲点８５が形成される。フラット部８３及び曲線部８４は、各ティース８１の径方向中心線からみて、フラット部８３が内側、曲線部８４が外側で、左右均等に形成される。フラット部８３は、前述したように、ティース８１の径方向に垂直な直線状に理想的には形成されるが、垂直な直線から所定の範囲の誤差（例えば±０．２ｍｍの凹凸や傾き）を許容してもよい。この所定の誤差はティース８１の周方向延伸部の径方向の幅や、アーマチャコア８構成する電磁鋼板の厚さなどによって決めてもよい。曲線部８４は、フラット部８３と異なる曲率の曲面で形成されるが、理想的には回転軸を中心とした同心円状に形成されるとよい。 The outer peripheral side of the teeth 81 is formed by a predetermined arc centered on the shaft 5 so as to hold an arbitrary gap with the inner surface of the magnet 3. Further, the inner peripheral side of the teeth 81 (the boundary surface on the outer peripheral side of the slot 10) is formed by a flat portion 83 formed in a straight line perpendicular to the radial direction of the teeth 81 and a curve having a curvature different from that of the flat portion 83. It is composed of a curved portion 84. The flat portion 83 and the curved portion 84 are continuously connected, and an inflection point 85 whose curvature changes is formed at the boundary thereof. The flat portion 83 and the curved portion 84 are formed evenly on the left and right sides, with the flat portion 83 on the inside and the curved portion 84 on the outside when viewed from the radial center line of each tooth 81. As described above, the flat portion 83 is ideally formed in a straight line perpendicular to the radial direction of the teeth 81, but an error in a predetermined range from the vertical straight line (for example, unevenness or inclination of ± 0.2 mm). May be tolerated. This predetermined error may be determined by the radial width of the circumferentially stretched portion of the teeth 81, the thickness of the electromagnetic steel plate constituting the armature core 8, and the like. The curved portion 84 is formed by a curved surface having a curvature different from that of the flat portion 83, but ideally, it is preferably formed in a concentric circle centered on the rotation axis.
　本実施例では、ティース８１の先端部の内側にフラット部８３を設け、変曲点８５の外側を曲線部８４で形成したので、ティース８１の先端部の周方向延伸部の幅が、ティース８１の径方向延伸部に近い位置において広くなり、径方向延伸部から遠い位置において狭くなるので、ティース８１の先端部を通る磁束の流れを調節でき、コギングトルクを低減できる。 In this embodiment, since the flat portion 83 is provided inside the tip portion of the teeth 81 and the outside of the inflection point 85 is formed by the curved portion 84, the width of the circumferential extension portion of the tip portion of the teeth 81 is the teeth 81. Since it widens at a position close to the radial extension portion and narrows at a position far from the radial extension portion, the flow of magnetic flux passing through the tip portion of the teeth 81 can be adjusted and the cogging torque can be reduced.
　また、Ｔ字形に形成される周方向延伸部のうち径方向延伸部に近い部分の径方向の幅が広くなるので、アーマチャコア８を通る磁束が周方向延伸部の先端にまで到達し、スロット開口部８２の位置における磁束密度の低下を抑制し、コギングトルクが低減できる。一方、周方向延伸部の径方向の幅を広くすると、アーマチャコイル１１の占積率が低下して、トルクが低下する。このため、フラット部８３の範囲を調節して、コギングトルクを低減しつつ、トルクの低下を抑制している。 Further, since the radial width of the portion of the T-shaped circumferentially stretched portion close to the radially stretched portion is widened, the magnetic flux passing through the armature core 8 reaches the tip of the circumferentially stretched portion, and the slot The decrease in magnetic flux density at the position of the opening 82 can be suppressed, and the cogging torque can be reduced. On the other hand, if the width of the circumferentially stretched portion in the radial direction is widened, the space factor of the armature coil 11 decreases, and the torque decreases. Therefore, the range of the flat portion 83 is adjusted to reduce the cogging torque and suppress the decrease in torque.
　また、フラット部８３が形成される周方向の角度範囲（フラット部８３の端部（変曲点８５）と回転中心を結ぶ線がなす角度）θｓは、１極あたりのマグネット３が占める角度範囲（すなわち、ヨーク２の内面にマグネット３が接している範囲）をθｅ、マグネット３の極数をｐ（図では２）、アーマチャコア８のスロット数ｓ（図では５）を用いて、フラット部８３を下式の範囲で形成すると、コギングトルクの低減に適することが分かった。
　θｓ÷θα＝０．５～０．７　θα＝θｅ×ｐ÷ｓ　 Further, the angular range in the circumferential direction in which the flat portion 83 is formed (the angle formed by the line connecting the end portion (curvature point 85) of the flat portion 83 and the center of rotation) θs is the angle range occupied by the magnet 3 per pole. (That is, the range in which the magnet 3 is in contact with the inner surface of the yoke 2) is θe, the number of poles of the magnet 3 is p (2 in the figure), and the number of slots s of the armature core 8 (5 in the figure) is used to make a flat portion. It was found that forming the 83 in the range of the following formula is suitable for reducing the cogging torque.
θs ÷ θα = 0.5 to 0.7 θα = θe × p ÷ s
　上式において、θαは、マグネット３の全周に占める角度をスロット数で除した角度であり、１スロットあたりでマグネット３が占める角度を表すパラメータである。 In the above equation, θα is an angle obtained by dividing the angle occupied by the entire circumference of the magnet 3 by the number of slots, and is a parameter representing the angle occupied by the magnet 3 per slot.
　図５は、本実施例のアーマチャコア８による効果を示す図であり、フラット部８３の範囲が変化したときのコギングトルクの変化を示す図である。図５では、θｓ÷θα（θα対するフラット部８３の範囲θｓの割合）を横軸とし、フラット部８３を設けない場合（θｓ＝θｏ）を基準としたコギングトルクの比率を縦軸とした。 FIG. 5 is a diagram showing the effect of the armature core 8 of this embodiment, and is a diagram showing a change in cogging torque when the range of the flat portion 83 changes. In FIG. 5, the horizontal axis is θs ÷ θα (ratio of the range θs of the flat portion 83 to θα), and the vertical axis is the ratio of cogging torque based on the case where the flat portion 83 is not provided (θs = θo).
　図５によると、θｓ＝θｏからθαが増加すると（フラット部８３の範囲が広くなると）、コギングトルクが低下して、θｓ÷θαが０．５～０．７の範囲で、コギングトルクが低くなる。その後、θαが増加するとコギングトルクが増加する。このことから、θｓ÷θαが０．５～０．７の範囲が、コギングトルクが低減できる範囲であることが分かる。 According to FIG. 5, when θα increases from θs = θo (when the range of the flat portion 83 becomes wider), the cogging torque decreases, and θs ÷ θα is in the range of 0.5 to 0.7, and the cogging torque is low. Become. After that, as θα increases, the cogging torque increases. From this, it can be seen that the range where θs ÷ θα is 0.5 to 0.7 is the range in which the cogging torque can be reduced.
　以上に説明したように、ティース８１の内周側のスロット１０との境界部は、径方向に垂直な直線状に形成されるフラット部８３と、フラット部８３との境界に設けられる変曲点８５を介して、フラット部８３と連続する曲線状に形成される曲線部８４とで形成され、曲線部８４は、ティース８１の周方向においてフラット部８３より先端に位置するので、ティース８１の先端部の磁気の流れを変化させて、電動機の回転時に生じる磁気変化を調整し、ティース８１の端部の磁気量を増大でき、トルクの低下を抑制しつつ、コギングトルクを低減できる。また、変曲点８５からアーマチャコア８の外径側と同心円状に曲線部８４を延伸することによって、ティース８１の先端部の径方向の幅が小さくならず、直流電動機１の回転時の遠心力によるアーマチャコア８の変形を抑制できる。また、スロット開口部８２の開口幅を調節の自由度を向上できる。このため、ティース８１の先端が鋭利にならず、コイルの巻回時にアーマチャコイル１１がアーマチャコア８に引っ掛かることによるアーマチャコイル１１の傷付きを抑制できる。 As described above, the boundary portion of the teeth 81 with the slot 10 on the inner peripheral side is a turning point provided at the boundary between the flat portion 83 formed in a straight line perpendicular to the radial direction and the flat portion 83. The flat portion 83 is formed through the flat portion 83 and the curved portion 84 formed in a continuous curved shape. Since the curved portion 84 is located at the tip of the flat portion 83 in the circumferential direction of the teeth 81, the tip of the teeth 81 is formed. The magnetic flow of the portion can be changed to adjust the magnetic change that occurs when the electric motor rotates, the amount of magnetic force at the end of the tooth 81 can be increased, and the cogging torque can be reduced while suppressing the decrease in torque. Further, by extending the curved portion 84 concentrically with the outer diameter side of the armature core 8 from the inflection point 85, the width of the tip portion of the teeth 81 in the radial direction is not reduced, and the DC motor 1 is centrifuged at the time of rotation. Deformation of the armature core 8 due to force can be suppressed. Further, the degree of freedom in adjusting the opening width of the slot opening 82 can be improved. Therefore, the tip of the teeth 81 is not sharpened, and the armature coil 11 can be prevented from being scratched by being caught by the armature core 8 when the coil is wound.
　なお、本発明は前述した実施例に限定されるものではなく、添付した特許請求の範囲の趣旨内における様々な変形例及び同等の構成が含まれる。例えば、前述した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに本発明は限定されない。また、ある実施例の構成の一部を他の実施例の構成に置き換えてもよい。また、ある実施例の構成に他の実施例の構成を加えてもよい。
また、各実施例の構成の一部について、他の構成の追加・削除・置換をしてもよい。 The present invention is not limited to the above-described embodiment, and includes various modifications and equivalent configurations within the scope of the appended claims. For example, the above-described examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the described configurations. Further, a part of the configuration of one embodiment may be replaced with the configuration of another embodiment. Further, the configuration of another embodiment may be added to the configuration of one embodiment.
In addition, other configurations may be added / deleted / replaced with respect to a part of the configurations of each embodiment.
１　直流電動機、２　ヨーク、３　マグネット、４　アーマチャ、５　シャフト、６　軸受、７　フロントブラケット、８　アーマチャコア、９　整流子、１０　スロット、１１　アーマチャコイル、１２　整流子片、１３　ブラシホルダ、１４　ブラシ、１５　バネ、１６　チョークコイル、１９　モータギア、２０　軸受、２１　リアブラケット、２６　外部給電端子、２７　マグネットステー、８１　ティース、８２　スロット開口部、８３　フラット部、８４　曲線部、８５　変曲点 1 DC motor, 2 yoke, 3 magnet, 4 armature, 5 shaft, 6 bearing, 7 front bracket, 8 armature core, 9 commutator, 10 slot, 11 armature coil, 12 commutator piece, 13 brush holder, 14 brush, 15 spring, 16 choke coil, 19 motor gear, 20 bearing, 21 rear bracket, 26 external power supply terminal, 27 magnet stay, 81 teeth, 82 slot opening, 83 flat part, 84 curved part, 85 turning point

Claims (3)

  1. 　回転電機のロータコアであって、
    　コイルが巻回されるスロット部と、
    　前記スロット部にコイルが巻回される空間を形成するティース部とを備え、
    　前記ティース部の内周側の前記スロット部との境界部は、径方向に垂直な直線状に形成されるフラット部と、前記フラット部との境界に設けられる変曲点を介して、前記フラット部と連続する曲線状に形成される曲線部とで形成され、
    　前記曲線部は、前記ティース部の周方向において前記フラット部より先端に位置することを特徴とするロータコア。     It is a rotor core of a rotary electric machine,
    The slot where the coil is wound and
    The slot portion is provided with a teeth portion that forms a space around which the coil is wound.
    The boundary portion between the teeth portion and the slot portion on the inner peripheral side is the flat portion via an inflection point provided at the boundary between the flat portion formed in a linear shape perpendicular to the radial direction and the flat portion. It is formed by a part and a curved part that is formed in a continuous curved shape.
    The rotor core is characterized in that the curved portion is located at the tip of the flat portion in the circumferential direction of the teeth portion.
  2. 　請求項１に記載のロータコアであって、
    　回転中心から見た前記変曲点の間の角度θｓ、１極あたりの磁石が占める角度θe、前記磁石の極数ｐ、前記スロット部の数ｓを用いて、
    θｓ÷（θｅ×ｐ÷ｓ）が０．５から０．７の範囲にあることを特徴とするロータコア。     The rotor core according to claim 1.
    Using the angle θs between the inflection points as seen from the center of rotation, the angle θe occupied by the magnet per pole, the number of poles p of the magnet, and the number s of the slot portion,
    A rotor core characterized in that θs ÷ (θe × p ÷ s) is in the range of 0.5 to 0.7.
  3. 　請求項１又は２に記載のロータコアと、
    　前記ロータコアの外周側に設けられる磁石を有することを特徴とする回転電機。     The rotor core according to claim 1 or 2,
    A rotary electric machine characterized by having a magnet provided on the outer peripheral side of the rotor core.
PCT/JP2021/001180 2020-02-10 2021-01-15 Rotor core and rotary electric machine WO2021161714A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003018773A (en) * 2001-06-28 2003-01-17 Sankyo Seiki Mfg Co Ltd Motor with core
JP2006333584A (en) * 2005-05-24 2006-12-07 Mitsumi Electric Co Ltd Motor
JP2007267439A (en) * 2006-03-27 2007-10-11 Mitsuba Corp Armature core in rotating-electric machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003018773A (en) * 2001-06-28 2003-01-17 Sankyo Seiki Mfg Co Ltd Motor with core
JP2006333584A (en) * 2005-05-24 2006-12-07 Mitsumi Electric Co Ltd Motor
JP2007267439A (en) * 2006-03-27 2007-10-11 Mitsuba Corp Armature core in rotating-electric machine

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