JPS6399739A - Motor - Google Patents

Abstract

PURPOSE:To reduce the temperature of bearing section, by providing an end bracket with two kinds of ventilating windows for sucking and discharging air. CONSTITUTION:A bobbin 2, around which the winding of a stator is wound, is molded integrally by a rosin constituting a housing 3 to constitute the stator. A rotor core 4 is fixed to a shaft 6, supported rotatably by ball bearings 7 held by end brackets 9. The end bracket 9 is provided with an inflated part 10, projected axially, and the ball bearing 7 is equipped in the inner periphery of the inflated part 10 while a rubber vibration insulator 11 is equipped on the outer periphery of the inflated part 10. The inflated part 10 is provided with a ventilating window 12 for sucking air on the top surface thereof and a ventilating window 13 for discharging air at a position communicating with a space 14 provided between a housing 3 and the rubber vibration insulator 11. Cool air, sucked through the ventilating window 12, cools the inside of a motor and is discharged through the ventilating window 13. The ball bearing 7 is provided at the inside of the inflated part 10, therefore, hot air does not hit it.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は誘導電動機の軸受部に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to a bearing for an induction motor.

従来の技術 近年、薄型・軽量化とともに低騒音化が重要視されてき
た。それを目的としてファンも効率の良いものが開発さ
れ、電動機の回転数も低くなってきている。電動機特性
はハイスリップ型となり、誘導電動機の回転子に流れる
電流値も高くなり鋼接になる回転子の発熱量も高（なっ
てきている。Conventional Technology In recent years, emphasis has been placed on reducing noise as well as thinning and lightweighting. For this purpose, more efficient fans have been developed, and the rotational speed of electric motors has become lower. Motor characteristics have become high-slip, the current flowing through the rotor of induction motors has also increased, and the amount of heat generated by the rotor, which is in contact with steel, has also increased.

ｐＪ下、図面を参照しながら上述した電動機の仕様につ
いて説明する。Below, specifications of the above-mentioned electric motor will be explained with reference to the drawings.

第３図は従来の電動機の構造を示すものである。FIG. 3 shows the structure of a conventional electric motor.

第３図において、ｌは固定子鉄心、２は固定子巻線（図
示せず）が巻装されるボビンで、ハウジング３を構成す
る樹脂により一体モールドされて固定子を構成している
。４は回転子鉄心、５は回転子一体部、６は回転子鉄心
４が固定された軸で、玉軸受７にて回転自在に支持され
ている。８は玉軸受７を保持するエンドブラケットで、
ハウジング３に取付けられている。In FIG. 3, l denotes a stator core, 2 denotes a bobbin around which stator windings (not shown) are wound, and they are integrally molded with resin constituting the housing 3 to constitute the stator. 4 is a rotor core, 5 is a rotor integral part, and 6 is a shaft to which the rotor core 4 is fixed, and is rotatably supported by a ball bearing 7. 8 is an end bracket that holds the ball bearing 7;
It is attached to the housing 3.

以Ｅのように構成された電動機について、以下その動作
を説明する。The operation of the electric motor configured as described above will be described below.

まず、固定子鉄心１とボビン２により保持された固定子
巻線により回転磁界を発生させ、それにより回転子一体
部５に電流が流れる。（４）電子の回転磁界と回転子電
流により回転トルクを発生させる。First, a rotating magnetic field is generated by the stator winding held by the stator core 1 and the bobbin 2, and a current flows through the rotor integral part 5. (4) Rotating torque is generated by the rotating magnetic field of electrons and rotor current.

発明が解決しようとする問題点 しかしながら、上記のような構成では、回転子一体部５
に流れる電流がｆ＠摸七なり発熱し、その発熱が軸６を
伝導し軸受部への温度上昇となる。Problems to be Solved by the Invention However, in the above configuration, the rotor integral part 5
The current flowing through the shaft 6 generates heat, which is transmitted through the shaft 6 and causes a temperature rise in the bearing section.

又、モータ内部のスペースにこもった固定子例の発熱分
も軸受部への温度上昇となる。Furthermore, the heat generated by the stator, which is trapped in the space inside the motor, also increases the temperature of the bearing.

軸受部の温度」−昇値はある程度を越すとグリースを劣
化させ音発生やロックにつながり電動機の寿命を低下さ
せる。Bearing temperature - If the temperature rise exceeds a certain level, it deteriorates the grease, causing noise and locking, and shortening the life of the motor.

−・般に固定子全体を樹脂で一体モールドした電動機は
、その構造上電動機内部にこもった熱が電動機外部へ放
散しにくい。従って軸受部の温度もあがりやすい。-Generally, electric motors in which the entire stator is integrally molded with resin have a structure that makes it difficult for the heat trapped inside the motor to dissipate to the outside of the motor. Therefore, the temperature of the bearing portion also tends to rise.

本発明は一ヒ記欠点に鑑み、軸受部の温度上昇をおさえ
ることを目的としたものである。In view of the above-mentioned drawbacks, the present invention aims to suppress the temperature rise in the bearing portion.

問題点を解決するための手段 そこで本発明は、エンドブラケットに吸い込み用と叶き
出し用の通風窓を設けたものである。Means for Solving the Problems According to the present invention, the end bracket is provided with ventilation windows for intake and opening.

作用 一ヒ記構成によれば、電動機内部に外気が導入され、熱
が電動機内部にこもることがなく、軸受部の温度上昇が
抑えられる。According to the configuration described above, outside air is introduced into the electric motor, heat is not trapped inside the electric motor, and the temperature rise in the bearing portion is suppressed.

実施例 以下本発明の一実施例を第１図、第２図を参口しながら
説明する。なお、−１−記従来の構成と同一構成部品は
同一符号を付し、その説明を省略する。EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. Components that are the same as those in the conventional configuration described in -1- are designated by the same reference numerals, and their explanations will be omitted.

図において、９は軸方向外側に突出する膨出部】０を有
するエンドブラケットで、膨出部】０の内周に玉軸受７
が、外周に電動機を防振支持するための防振ゴム１１が
装備されている。１２は膨出部１０の頂面に設けた吸い
込み用通風窓、１３はハウジング３と防振ゴム１１との
間の空間１４に連通ずる吐き出し用通風窓である。In the figure, reference numeral 9 denotes an end bracket having a bulge 〇 0 projecting outward in the axial direction, and a ball bearing 7 is mounted on the inner circumference of the bulge 〇 .
However, a vibration-proof rubber 11 is provided on the outer periphery to support the electric motor in a vibration-proof manner. 12 is a suction ventilation window provided on the top surface of the bulging portion 10, and 13 is an exhaust ventilation window communicating with a space 14 between the housing 3 and the vibration isolating rubber 11.

以上のように構成された電動機について、以下その動作
を説明する。The operation of the electric motor configured as described above will be explained below.

エンドブラケット９の通風窓１２から電動機外部の冷風
が電動機運転時に電動機内部へ吸い込まれ電動機内部の
熱風を通風窓１：９より吐き出す。Cold air outside the motor is sucked into the motor through the ventilation window 12 of the end bracket 9 during operation, and hot air inside the motor is discharged through the ventilation window 1:9.

さらに玉軸受７は、エンドブラケット９の膨出部１０の
内周に設ける構造Ｆ１、電動機内部にこもった熱風が直
接軸受７にあたりに＜＜、従って軸受部の温度低減が図
れる。Furthermore, the ball bearing 7 has a structure F1 provided on the inner periphery of the bulging portion 10 of the end bracket 9, so that the hot air trapped inside the electric motor directly hits the bearing 7. Therefore, the temperature of the bearing portion can be reduced.

発明の効果 以上のように本発明は、エンドブラケットに吸い込み用
と叶き出し用の２種類の通風窓を設けたことにより軸受
部の温度を低減させることが可能となり、その実用的効
果は大なるものがある。Effects of the Invention As described above, the present invention has two types of ventilation windows, one for suction and one for opening, on the end bracket, making it possible to reduce the temperature of the bearing part, and its practical effects are great. There is something.

（ａ）、（ｂ）は同エンドブラケットの側面図波び半裁
断面図、第３図は従来の電動機の断面図である。(a) and (b) are side views of the same end bracket, and FIG. 3 is a cross-sectional view of a conventional electric motor.

１・・・同定子鉄心、３・・・・・・ハウジング、７・
・・・・・軸受、９・・・・・・エンドブラケット、１
２．１３・・曲・通風窓。1... Identifier core, 3... Housing, 7...
...Bearing, 9 ...End bracket, 1
2.13...Track/ventilation window.

代理人の氏名　弁理士　中尾敏男　はが１名第２図Name of agent: Patent attorney Toshio Nakao (1 person) Figure 2

Claims (1)

【特許請求の範囲】[Claims] 固定子全体を樹脂で一体モールドしてなるハウジングに
取付けられ、軸受部を保持するエンドブラケットに、吸
い込み用と吐き出し用の通風窓を配設した電動機。An electric motor that is attached to a housing made by integrally molding the entire stator with resin, and has ventilation windows for suction and discharge on the end bracket that holds the bearing.