JP3642179B2 - Method for manufacturing motor rotor - Google Patents

Method for manufacturing motor rotor Download PDF

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Publication number
JP3642179B2
JP3642179B2 JP08772698A JP8772698A JP3642179B2 JP 3642179 B2 JP3642179 B2 JP 3642179B2 JP 08772698 A JP08772698 A JP 08772698A JP 8772698 A JP8772698 A JP 8772698A JP 3642179 B2 JP3642179 B2 JP 3642179B2
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JP
Japan
Prior art keywords
rotor
fan
cooling fan
fixing bracket
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP08772698A
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Japanese (ja)
Other versions
JPH11289712A (en
Inventor
勉 夏原
富男 山田
四郎 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP08772698A priority Critical patent/JP3642179B2/en
Publication of JPH11289712A publication Critical patent/JPH11289712A/en
Application granted granted Critical
Publication of JP3642179B2 publication Critical patent/JP3642179B2/en
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  • Motor Or Generator Cooling System (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、小型・高出力が要求される温度上昇が高い、例えば充電電動工具用モータ等に利用されるモータのロータの製造方法に関するものである。
【０００２】
【従来の技術】
従来から充電電動工具用モータにおいて、ロータに冷却ファンを取付けることが行われており、従来にあってはモータの冷却ファンの固定はロータ鉄芯又はコミテータに接着により固定していた。
【０００３】
【発明が解決しようとする課題】
ところが、小型・高出力が要求されるモータではロータコイルの温度上昇が高く、このため、上記した従来例のようにロータ鉄芯又はコミテータに冷却ファンを接着により固定するものにおいては、冷却ファンの接着力の低下により接着の外れが発生し、モータロックして回転不能になる場合があるという問題があった。
【０００４】
本発明は上記の従来例の問題点に鑑みて発明したものであって、ロータコイルの温度上昇が高くても冷却ファンが外れたりするおそれがなくて確実な固定ができるモータのロータの製造方法を提供することを課題とするものである。
【０００５】
【課題を解決するための手段】
上記課題を解決するために本発明のモータのロータの製造方法は、モータのロータコイル１を冷却するための冷却ファン２を設けたモータのロータの製造方法において、ファン固定金具３をロータ鉄芯４と同時に絶縁コーティング１０を行い、次に、コミテータ５を固定すると共にロータ鉄芯４に巻線したロータコイル１と電気的に接合し、その後、冷却ファン２のリング部２ａの内面部をファン固定金具３の外面部に当接圧入し、ファン固定金具３に設けた係止片６を折り曲げて冷却ファン２のリング部２ａに係止して冷却ファン２を固定することを特徴とするものである。このような構成とすることで、冷却ファン２を機械的に固定できることになる。
【０００６】
【発明の実施の形態】
以下本発明を添付図面に示す実施形態に基づいて説明する。
モータのロータ７を製造するに当たっては、まず、軸８に電磁鋼板を打ち抜き積層したロータ鉄芯４と、金属又は合成樹脂よりなるブッシュ９とを圧入固定し、次に、図１に示すように金属薄板からなるファン固定金具３の孔を軸８に挿入する。ここで、ファン固定金具３は環状部３ａの外周部から放射状に複数（実施形態においては３個）の腕片１１を突設し、各腕片１１の先端部に腕片１１に対して直角に係止片６が折り曲げ突設してある。そして、係止片６を除くファン固定金具３の片面（腕片１１と反対側の面）を図１のように積層したロータ鉄芯４の片側の端面に当接する。次に、前記ロータ鉄芯４と一緒に絶縁コーティング１０を行う。次に、図３に示すように、ロータ鉄芯４にコミテータ５を圧入又は接着等により軸８に固定し、ロータ鉄芯４に巻き廻されたロータコイル１と溶接等の接合手段で電気的に接合する。次に、合成樹脂等からなる冷却ファン２をロータ鉄芯４の端面まで挿入し、冷却ファン２のリング部２ａの内面部をファン固定金具３の外面部に当接圧入し、ファン固定金具３に設けた係止片６を折り曲げて冷却ファン２のリング部２ａに係止して冷却ファン２を固定することで、冷却ファン２を機械的に固定するものである。ここで、冷却ファン２は環状部１２の外周部に放射状に複数のブレード部１３を設けたファン本体の背方にリング部２ａを配置し、ブレード部１３とリング部２ａとを脚部２４により一体に連設して構成してある。そして、ロータ鉄芯４のリング部２ａの内面部をファン固定金具３の外面部に当接圧入した状態で、ファン固定金具３に設けた係止片６の先端部がリング部２ａよりもファン本体側に突出するので、この係止片６の先端部を外側に９０°折り曲げてリング部２ａのファン本体側の面に当てて係止することで、冷却ファン２を機械的に固定するものである。このように、冷却ファン２を機械的に固定することで、ロータコイル１の温度上昇が上昇しても冷却ファン２が外れるおそれがなく、この結果、ロータコイルの温度上昇が高い小型・高出力が要求されるモータであっても何等問題ないものである。
【０００７】
ところで、冷却ファン２のリング部２ａの内径ｄはファン固定金具３の複数の係止片６の外面を結ぶ円の径Ｄよりも若干小さくなっており、冷却ファン２のリング部２ａの内面部をファン固定金具３の外面部に当接圧入することで、ラジアル方向及び回転方向のずれを防止することができるようになっている。また、係止片６の腕片１１から冷却ファン２のリング部２ａの厚みに相当する長さ位置には図１（ｃ）に示すように溝部１６が設けてあり、この溝部１６部分で係止片６の先端部を外側に９０°折り曲げることで、係止片６をリング部２ａのファン本体側の面に当接係止するのが容易に行えるものである。
【０００８】
なお、ファン固定金具３の係止片６を折り曲げ加工して上記のように係止片６の先端部を外側に９０°折り曲げてリング部２ａのファン本体側の面に当てて係止すると共にこの部分を更に接着剤により接着して一体化することを併用してもよく、このように機械的に固定すると共に接着剤による固定することを併用すると、より固定が強固となるものである。
【０００９】
【発明の効果】
本発明にあっては、上述のように、モータのロータコイルを冷却するための冷却ファンを設けたモータのロータの製造方法において、ファン固定金具をロータ鉄芯と同時に絶縁コーティングし、次に、コミテータを固定すると共にロータ鉄芯に巻線したロータコイルと電気的に接合し、その後、冷却ファンのリング部の内面部をファン固定金具の外面部に当接圧入し、ファン固定金具に設けた係止片を折り曲げて冷却ファンのリング部に係止して冷却ファンを固定するので、ロータコイルの温度上昇が高くても冷却ファンが外れたりするおそれがなくて確実な固定ができて、冷却ファンによる冷却効果を維持できると共にモータロックによる回転不能になることを防止できるものである。
【図面の簡単な説明】
【図１】（ａ）は本発明の製造方法においてファン固定金具を嵌め込んだ段階を示す正面図であり、（ｂ）は側面図であり、（ｃ）は（ｂ）の矢印Ａ方向からみた係止片の拡大図である。
【図２】（ａ）は絶縁コーティングした段階を示す正面図であり、（ｂ）は側面図である。
【図３】（ａ）はコミテータを取付けた段階を示す断面図であり、（ｂ）は側面図である。
【図４】（ａ）は冷却ファンの取付け段階を示す断面図であり、（ｂ）は側面図である。
【符号の説明】
１ ロータコイル
２ 冷却ファン
２ａ リング部
３ ファン固定金具
４ ロータ鉄芯
５ コミテータ
６ 係止片
１０ 絶縁コーティング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a rotor of a motor that is used for, for example, a motor for a charging electric tool, and has a high temperature rise that requires a small size and high output.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a motor for a charging electric tool, a cooling fan is attached to a rotor, and conventionally, the cooling fan of the motor is fixed to a rotor iron core or a commutator by adhesion.
[0003]
[Problems to be solved by the invention]
However, in a motor that requires small size and high output, the temperature of the rotor coil rises so high that the cooling fan is fixed to the rotor iron core or the commutator as in the conventional example described above. There has been a problem that the adhesion may be lost due to a decrease in the adhesive force, and the motor may be locked to be unable to rotate.
[0004]
The present invention was invented in view of the above-described problems of the conventional example, and even if the temperature of the rotor coil is high, there is no risk that the cooling fan will come off and a method for manufacturing a rotor of a motor that can be securely fixed. It is a problem to provide.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a motor rotor manufacturing method according to the present invention is a motor rotor manufacturing method in which a cooling fan 2 for cooling a motor rotor coil 1 is provided. 4, insulation coating 10 is performed, and then the commutator 5 is fixed and electrically joined to the rotor coil 1 wound around the rotor core 4, and then the inner surface of the ring portion 2 a of the cooling fan 2 is connected to the fan The cooling fan 2 is fixed by abutting and press-fitting to the outer surface portion of the fixing bracket 3, bending the locking piece 6 provided on the fan fixing bracket 3, and locking it to the ring portion 2 a of the cooling fan 2. It is. With such a configuration, the cooling fan 2 can be mechanically fixed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on embodiments shown in the accompanying drawings.
In manufacturing the rotor 7 of the motor, first, the rotor iron core 4 in which electromagnetic steel plates are punched and laminated on the shaft 8 and the bush 9 made of metal or synthetic resin are press-fitted and fixed, and then, as shown in FIG. A hole of the fan fixing bracket 3 made of a thin metal plate is inserted into the shaft 8. Here, the fan fixing bracket 3 has a plurality of (in the embodiment, three) arm pieces 11 projecting radially from the outer peripheral portion of the annular portion 3 a, and is perpendicular to the arm pieces 11 at the tip of each arm piece 11. The locking piece 6 is bent and protruded. Then, one surface of the fan fixing bracket 3 excluding the locking piece 6 (the surface opposite to the arm piece 11) is brought into contact with one end surface of the rotor core 4 laminated as shown in FIG. Next, the insulating coating 10 is performed together with the rotor iron core 4. Next, as shown in FIG. 3, a commutator 5 is fixed to the shaft 8 by press-fitting or bonding to the rotor iron core 4, and the rotor coil 1 wound around the rotor iron core 4 is electrically connected by a joining means such as welding. To join. Next, the cooling fan 2 made of synthetic resin or the like is inserted to the end surface of the rotor iron core 4, and the inner surface portion of the ring portion 2 a of the cooling fan 2 is pressed into the outer surface portion of the fan fixing bracket 3. The cooling fan 2 is mechanically fixed by bending the locking piece 6 provided on the ring and locking it to the ring portion 2a of the cooling fan 2 to fix the cooling fan 2. Here, the cooling fan 2 has a ring portion 2a disposed behind the fan body in which a plurality of blade portions 13 are provided radially on the outer periphery of the annular portion 12, and the blade portion 13 and the ring portion 2a are connected to each other by the legs 24. It is configured to be integrally connected. Then, in a state where the inner surface portion of the ring portion 2a of the rotor iron core 4 is pressed into contact with the outer surface portion of the fan fixing bracket 3, the tip end portion of the locking piece 6 provided on the fan fixing bracket 3 is more fan than the ring portion 2a. Since it protrudes to the main body side, the cooling fan 2 is mechanically fixed by bending the front end portion of the locking piece 6 90 ° outward and engaging it with the surface on the fan main body side of the ring portion 2a. It is. Thus, by fixing the cooling fan 2 mechanically, there is no possibility that the cooling fan 2 will come off even if the temperature rise of the rotor coil 1 increases. As a result, the rotor coil 1 has a high temperature rise and small size and high output. Even if the motor is required, there is no problem.
[0007]
Incidentally, the inner diameter d of the ring portion 2a of the cooling fan 2 is slightly smaller than the diameter D of the circle connecting the outer surfaces of the plurality of locking pieces 6 of the fan fixing bracket 3, and the inner surface portion of the ring portion 2a of the cooling fan 2 Is pressed against the outer surface of the fan fixing bracket 3 to prevent the radial and rotational deviations. Further, a groove portion 16 is provided at a position corresponding to the thickness of the ring portion 2a of the cooling fan 2 from the arm piece 11 of the locking piece 6 as shown in FIG. By bending the distal end portion of the stop piece 6 by 90 ° outward, the engagement piece 6 can be easily abutted and engaged with the surface of the ring portion 2a on the fan main body side.
[0008]
In addition, the locking piece 6 of the fan fixing bracket 3 is bent and the front end portion of the locking piece 6 is bent 90 ° outward as described above and applied to the surface on the fan body side of the ring portion 2a to be locked. This part may be further bonded and integrated with an adhesive, and if fixed together with such an adhesive together with mechanical fixing, the fixing becomes stronger.
[0009]
【The invention's effect】
In the present invention, as described above, in the method of manufacturing a rotor of a motor provided with a cooling fan for cooling the rotor coil of the motor, the fan fixing bracket is insulated and coated simultaneously with the rotor core, The commutator is fixed and electrically joined to the rotor coil wound around the rotor iron core. After that, the inner surface of the ring portion of the cooling fan is pressed into the outer surface of the fan fixing bracket, and the fan fixing bracket is provided. Since the cooling fan is fixed by bending the locking piece and locking it to the ring part of the cooling fan, there is no risk of the cooling fan coming off even if the temperature of the rotor coil is high. It is possible to maintain the cooling effect by the fan and to prevent the motor from being disabled due to the motor lock.
[Brief description of the drawings]
1A is a front view showing a stage in which a fan fixing bracket is fitted in the manufacturing method of the present invention, FIG. 1B is a side view, and FIG. 1C is a view from the direction of arrow A in FIG. It is the enlarged view of the seen locking piece.
FIG. 2A is a front view showing a stage where an insulating coating is applied, and FIG. 2B is a side view.
3A is a cross-sectional view showing a stage where a commutator is attached, and FIG. 3B is a side view.
4A is a cross-sectional view showing a cooling fan mounting stage, and FIG. 4B is a side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor coil 2 Cooling fan 2a Ring part 3 Fan fixing bracket 4 Rotor core 5 Commutator 6 Locking piece 10 Insulation coating

Claims (1)

モータのロータコイルを冷却するための冷却ファンを設けたモータのロータの製造方法において、ファン固定金具をロータ鉄芯と同時に絶縁コーティングし、次に、コミテータを固定すると共にロータ鉄芯に巻線したロータコイルと電気的に接合し、その後、冷却ファンのリング部の内面部をファン固定金具の外面部に当接圧入し、ファン固定金具に設けた係止片を折り曲げて冷却ファンのリング部に係止して冷却ファンを固定することを特徴とするモータのロータの製造方法。In a method of manufacturing a rotor of a motor provided with a cooling fan for cooling the rotor coil of the motor, the fan fixing bracket is insulated and coated at the same time as the rotor iron core, and then the commutator is fixed and wound around the rotor iron core. Electrically joined to the rotor coil, and then the inner surface of the ring part of the cooling fan is pressed into the outer surface of the fan fixing bracket, and the locking piece provided on the fan fixing bracket is bent to the ring part of the cooling fan. A method for manufacturing a rotor of a motor, wherein the cooling fan is fixed by locking.
JP08772698A 1998-03-31 1998-03-31 Method for manufacturing motor rotor Expired - Fee Related JP3642179B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08772698A JP3642179B2 (en) 1998-03-31 1998-03-31 Method for manufacturing motor rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08772698A JP3642179B2 (en) 1998-03-31 1998-03-31 Method for manufacturing motor rotor

Publications (2)

Publication Number Publication Date
JPH11289712A JPH11289712A (en) 1999-10-19
JP3642179B2 true JP3642179B2 (en) 2005-04-27

Family

ID=13922929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP08772698A Expired - Fee Related JP3642179B2 (en) 1998-03-31 1998-03-31 Method for manufacturing motor rotor

Country Status (1)

Country Link
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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57111068U (en) * 1980-12-25 1982-07-09
JPS6051432A (en) * 1983-08-31 1985-03-22 Hitachi Ltd Cooling fan of rotary electric machine
JP2810000B2 (en) * 1995-05-31 1998-10-15 マブチモーター株式会社 Small motor

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