JPS639253Y2 - - Google Patents
Info
- Publication number
- JPS639253Y2 JPS639253Y2 JP785481U JP785481U JPS639253Y2 JP S639253 Y2 JPS639253 Y2 JP S639253Y2 JP 785481 U JP785481 U JP 785481U JP 785481 U JP785481 U JP 785481U JP S639253 Y2 JPS639253 Y2 JP S639253Y2
- Authority
- JP
- Japan
- Prior art keywords
- load
- gap length
- stator
- bearing
- motor according
- 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
Links
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Description
【考案の詳細な説明】
本考案は回転時の振動、騒音の発生を防止する
ようにした交流電動機に関するものである。[Detailed Description of the Invention] The present invention relates to an AC motor that prevents vibration and noise from occurring during rotation.
通常、第１図に示すような交流電動機はロータ
１とステータ２との空隙長ｔが全周囲一定（例え
ば0.3mm）となるように、つまり回転軸３とロー
タ１とがステータ２の中心となるように設計され
て組立てられる。ところが、ブラケツト４、軸受
５，６の部品の精度、組立時のばらつき等で空隙
長ｔにもある程度のばらつきが生じる。すると、
ある条件下において振動、騒音が発生する。 Normally, an AC motor as shown in FIG. It is designed and assembled to be. However, due to the accuracy of the parts such as the bracket 4 and the bearings 5 and 6, and variations during assembly, the gap length t also varies to some extent. Then,
Vibration and noise occur under certain conditions.
すなわち、ベルト７のテンシヨンF1の方向が
第１図の右方向であるとすると、軸受５にかかる
力F3は、
F3＝F1・l1＋l2＋l3／l2＋l3−F2
・l3／l2＋l3（sinωt）2
ここで、第２図に示すように、F1は時間的に
略一定で、F2は磁束の２乗に比例し、F2∝
（sinωt）2となつて時間的に変化する。なお、ω＝
2πf、ｆ＝電源周波数である。 That is , assuming that the direction of the tension F 1 of the belt 7 is to the right in FIG . 2・l 3 /l 2 +l 3 (sinωt) 2Here , as shown in Figure 2, F 1 is approximately constant over time, F 2 is proportional to the square of the magnetic flux, and F 2 ∝
(sinωt) 2 and changes over time. In addition, ω=
2πf, f=power frequency.
以上の構成において、F1・（l1＋l2＋l3）＜F2・l3
の条件下では、F3は第２図点線のような正負の
繰返しとなる。つまり空隙長t1における力F2がベ
ルトテンシヨンF1の方向に対し略180度だけ反対
側により多く偏つているとき、すなわちベルトテ
ンシヨンF1と同一方向の空隙長t2より反対側の空
隙長t1が短かいt1＞t2場合に、F1を正とすると、
F2が負側で波形に変化をする。したがつて、回
転軸３が第２図点線F3のように振動を生じ、軸
受５との衝撃により異常な振動や騒音を発生する
こととなる。 In the above configuration, F 1・(l 1 +l 2 +l 3 )<F 2・l 3
Under these conditions, F 3 becomes positive and negative repeatedly as shown by the dotted line in Figure 2. In other words, when the force F 2 at the gap length t 1 is biased more toward the opposite side by approximately 180 degrees with respect to the direction of the belt tension F 1, that is, when the force F 2 at the gap length t 1 is more biased toward the opposite side than the gap length t 2 in the same direction as the belt tension F 1, If the gap length t 1 is short t 1 > t 2 and F 1 is positive, then
The waveform changes when F 2 is on the negative side. Therefore, the rotating shaft 3 vibrates as indicated by the dotted line F3 in FIG. 2, and the impact with the bearing 5 causes abnormal vibrations and noise.
そこで、ステータ２とロータ１との磁気吸引力
をベルトと同一方向となるように、つまり、F3
≧０となるようにすれば振動、騒音を可及的に減
少せしめることができる。 Therefore, the magnetic attraction force between the stator 2 and the rotor 1 is set in the same direction as the belt, that is, F 3
By setting ≧0, vibration and noise can be reduced as much as possible.
本考案は上述の点に鑑みなされたもので、ロー
タとステータとの空隙長をテンシヨンと同一方向
側を狭くし、反対側を広くすることにより、少な
くともテンシヨンを直接受ける軸受が正負の繰返
しの力を受けないようにしたものである。 The present invention was developed in view of the above points, and by narrowing the gap length between the rotor and stator on the side in the same direction as the tension and widening it on the opposite side, at least the bearing that directly receives the tension can be exposed to repeated positive and negative forces. This was done so that it would not be affected.
以下、本考案の一実施例を第３図について説明
する。なお、第１図と同一部分は同一符号とす
る。 An embodiment of the present invention will be described below with reference to FIG. Note that the same parts as in FIG. 1 are given the same reference numerals.
２はステータで、このステータ２は外周近くの
取付け孔８とブラケツト４の取付け孔９とを一致
させ、ボルト１０で固着されている。またブラケ
ツト４の略中心位置には軸受５，６が設けられ、
ロータ１と一体の回転軸３が軸支されている。前
記回転軸３の端部にはプーリ１１が固着され、ベ
ルト７である一定方向にテンシヨンF1が加えら
れる。 Reference numeral 2 denotes a stator, and the stator 2 is fixed with bolts 10, with mounting holes 8 near the outer periphery aligned with mounting holes 9 of the bracket 4. Further, bearings 5 and 6 are provided approximately at the center of the bracket 4.
A rotating shaft 3 integral with the rotor 1 is pivotally supported. A pulley 11 is fixed to the end of the rotating shaft 3, and a tension F1 is applied to the belt 7 in a certain direction.
この場合、テンシヨンF1を直接受ける軸受５
に近い側のベルトテンシヨンF1と同一方向の空
隙長をt21、反対側をt11とし、また他方の軸受６
に近い側のベルトテンシヨンF1と同一方向の空
隙長をt22、反対側をt12とするとき、t11＞t12、t12
＜t22となるような構成とする。 In this case, the bearing 5 that directly receives the tension F 1
The gap length in the same direction as the belt tension F 1 on the side closer to is t 21 , the opposite side is t 11 , and the other bearing 6
When the gap length in the same direction as the belt tension F 1 on the side closer to is t 22 and the gap length on the opposite side is t 12 , t 11 > t 12 , t 12
The configuration is such that <t 22 .
このような構成とするための具体的な第１の方
法として、ブラケツト４の一方の軸受５の取付け
位置１２を中心よりもベルトテンシヨンF1と同
一方向にずらし、他方の軸受６の取付け位置１３
をベルトテンシヨンF1と反対方向にずらして回
転軸３をわずか傾斜せしめる。このようにする
と、軸受５の力F3は図中右方向のみ、軸受６の
力F4は図中左方向のみとなつて両方の軸受５，
６について振動、騒音が防止される。 As a first concrete method for achieving such a configuration, the mounting position 12 of one bearing 5 of the bracket 4 is shifted from the center in the same direction as the belt tension F1 , and the mounting position 12 of the other bearing 6 is shifted from the center. 13
is shifted in the opposite direction to the belt tension F1 to slightly tilt the rotating shaft 3. In this way, the force F 3 of the bearing 5 is only in the right direction in the figure, and the force F 4 of the bearing 6 is only in the left direction in the figure.
Regarding 6, vibration and noise are prevented.
第２の方法として軸受５，６の位置とブラケツ
ト４のステータ取付け孔９，９は正確に設定し、
ステータ２における取付け孔８の位置を左右でわ
ずか異ならせ、第１図における空隙長t1，t2を左
右で異ならせる。つまり、第１図とは逆に、ベル
トテンシヨンF1と同一方向の空隙長t2を狭くし、
反対側の空隙長t1を広くする。この第２の方法の
場合、他方の軸受６の力F4と磁気吸引力F22とが
反対方向であるため、この他方の軸受６に対して
は振動、騒音防止作用がないが、一方の軸受５が
振動、騒音発生の大部分を占めるので、これだけ
でも相当の効果がある。 The second method is to accurately set the positions of the bearings 5 and 6 and the stator mounting holes 9 and 9 of the bracket 4,
The positions of the mounting holes 8 on the left and right sides of the stator 2 are slightly different, and the gap lengths t 1 and t 2 in FIG. 1 are made different on the left and right sides. In other words, contrary to Fig. 1, the gap length t 2 in the same direction as the belt tension F 1 is narrowed,
Increase the gap length t 1 on the opposite side. In the case of this second method, since the force F 4 and the magnetic attraction force F 22 of the other bearing 6 are in opposite directions, there is no vibration and noise prevention effect on this other bearing 6, but one of the Since the bearing 5 accounts for most of the vibration and noise generation, this alone has a considerable effect.
ちなみに、洗濯機の交流電動機の場合、設定上
の空隙長ｔは0.3mmであるが、偏位はその約10％
程度で充分である。 By the way, in the case of the AC motor of a washing machine, the set gap length t is 0.3 mm, but the deviation is about 10% of that.
It is enough.
なお、磁気的吸引力はつぎのいわゆるベーレン
ト式によつてあらわされ、偏心する距離は可能な
限り小さい方がよい。 Incidentally, the magnetic attraction force is expressed by the following so-called Behrend equation, and it is preferable that the eccentric distance be as small as possible.
磁気的吸引力＝１／25・Ｓ（Ｂ／1000）2Δ／δ
ここで、Ｓは空隙面積、Ｂは磁束密度の実効
値、Δは偏心の大きさ、δは空隙の平均値であ
る。 Magnetic attraction force = 1/25・S (B/1000) 2 Δ/δ Here, S is the gap area, B is the effective value of the magnetic flux density, Δ is the eccentricity size, and δ is the average value of the gap. .
前記実施例において、ベルトテンシヨンF1の
方向と、軸受５の偏心方向とは略一致することが
好ましいが、ある一定範囲例えば90度程度の範囲
であればよい。さらに180度の範囲内であれば効
果がある。 In the embodiment described above, it is preferable that the direction of the belt tension F1 and the eccentric direction of the bearing 5 substantially coincide with each other, but they may be within a certain range, for example, about 90 degrees. Furthermore, it is effective within a 180 degree range.
本考案は上述のように、予めステータとロータ
の空隙間を負荷の方向に偏心させたので、振動、
騒音を可及的に防止できる。しかも、従来のよう
に、部品精度、組立て精度を上げる必要がないの
で、極めて安価に提供できるものであり、したが
つて実用に供するとその効果絶大である。 As mentioned above, in this invention, the gap between the stator and rotor is made eccentric in the direction of the load, so vibrations and
Noise can be prevented as much as possible. Moreover, unlike conventional methods, there is no need to increase component precision and assembly precision, so it can be provided at an extremely low cost, and when put into practical use, its effects are tremendous.
第１図は従来の交流電動機の説明図、第２図は
各部の力の説明図、第３図は本考案による交流電
動機の一実施例の説明図である。
１……ロータ、２……ステータ、３……回転
軸、４……ブラケツト、５，６……軸受、７……
ベルト、８……ステータの取付け孔、９……ブラ
ケツトの取付け孔、１０……ボルト、１１……プ
ーリ、１２，１３……軸受取付け位置。
FIG. 1 is an explanatory diagram of a conventional AC motor, FIG. 2 is an explanatory diagram of the forces of each part, and FIG. 3 is an explanatory diagram of an embodiment of the AC motor according to the present invention. 1... Rotor, 2... Stator, 3... Rotating shaft, 4... Bracket, 5, 6... Bearing, 7...
Belt, 8... Stator mounting hole, 9... Bracket mounting hole, 10... Bolt, 11... Pulley, 12, 13... Bearing mounting position.
Claims (1)
を駆動する電動機において、ステータとロータ
との間の空隙長を、負荷に近い軸受側において
負荷による力と略同一方向を狭く、反対側を広
くしてなることを特徴とする交流電動機。 (2) 負荷から遠い側の空隙長を、負荷による力と
略同一方向を広く、反対側を狭くしてなる実用
新案登録請求の範囲第１項記載の交流電動機。 (3) ブラケツトにおけるステータと軸受の取付け
位置の少なくともいずれか一方を中心からずら
してなる実用新案登録請求の範囲第１項または
第２項記載の交流電動機。 (4) ステータにおけるブラケツトとの取付け位置
を中心からずらしてなる実用新案登録請求の範
囲第１項または第２項記載の交流電動機。 (5) 負荷による力の方向と空隙長をずらした方向
とを略90度の範囲内とした実用新案登録請求の
範囲第１項、第２項、第３項または第４項記載
の交流電動機。[Claims for Utility Model Registration] (1) In an electric motor that drives a load on which a force acts in a direction substantially perpendicular to the rotating shaft, the gap length between the stator and rotor is determined by the force exerted by the load on the bearing side near the load. An AC motor characterized by being narrow in approximately the same direction and wide in the opposite direction. (2) The alternating current motor according to claim 1, wherein the gap length on the side far from the load is widened in substantially the same direction as the force exerted by the load and narrowed on the opposite side. (3) The alternating current motor according to claim 1 or 2, wherein at least one of the mounting positions of the stator and the bearing in the bracket is offset from the center. (4) The AC motor according to claim 1 or 2 of the utility model registration claim, in which the mounting position of the bracket on the stator is shifted from the center. (5) The AC motor according to claim 1, 2, 3, or 4 of the utility model registration claim, in which the direction of the force due to the load and the direction in which the gap length is shifted are within a range of approximately 90 degrees. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP785481U JPS639253Y2 (en) | 1981-01-22 | 1981-01-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP785481U JPS639253Y2 (en) | 1981-01-22 | 1981-01-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57122166U JPS57122166U (en) | 1982-07-29 |
| JPS639253Y2 true JPS639253Y2 (en) | 1988-03-18 |
Family
ID=29806035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP785481U Expired JPS639253Y2 (en) | 1981-01-22 | 1981-01-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS639253Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6284807B2 (en) * | 2014-03-31 | 2018-02-28 | 住友重機械工業株式会社 | Drive device |
-
1981
- 1981-01-22 JP JP785481U patent/JPS639253Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57122166U (en) | 1982-07-29 |
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