JPS6110460Y2 - - Google Patents
Info
- Publication number
- JPS6110460Y2 JPS6110460Y2 JP1977027460U JP2746077U JPS6110460Y2 JP S6110460 Y2 JPS6110460 Y2 JP S6110460Y2 JP 1977027460 U JP1977027460 U JP 1977027460U JP 2746077 U JP2746077 U JP 2746077U JP S6110460 Y2 JPS6110460 Y2 JP S6110460Y2
- Authority
- JP
- Japan
- Prior art keywords
- slots
- rotor
- slot
- noise
- force
- 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
- 230000006698 induction Effects 0.000 claims description 8
- 241000555745 Sciuridae Species 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Landscapes
- Induction Machinery (AREA)
Description
【考案の詳細な説明】
本考案は磁気騒音を低減した誘導電動機に関す
る。[Detailed Description of the Invention] The present invention relates to an induction motor with reduced magnetic noise.
かご形誘導電動機では、空隙における磁速の高
調波による漂遊損および漂遊負荷損を軽減する目
的で回転子には全閉スロツト構造が採用されるこ
とが多い。その場合、製造上の必要から第１図に
示すように１箇所のみ開口スロツト構造としスロ
ツト合せを容易にしている。 In squirrel cage induction motors, a fully closed slot structure is often adopted for the rotor in order to reduce stray loss and stray load loss due to harmonics of magnetic velocity in the air gap. In this case, due to manufacturing needs, only one slot structure is provided as shown in FIG. 1 to facilitate slot alignment.
即ち回転子鉄心１の中央にシヤフト穴２を有
し、さらに外周近くに、かご形導体用の全閉スロ
ツト３が等間隔に配置している。そしてこのうち
１ケ所のみ開口スロツト４としている。これは回
転子組立上この開口スロツト部にすり割りを打ち
込み、スロツト合わせをするためのものである。
スロツト合わせの後、アルミダイカストにより回
転子導体が形成される。このように開口スロツト
を混用しているために小形機種では騒音値が３〜
５〔dB〕上昇することを経験している。 That is, a shaft hole 2 is provided in the center of the rotor core 1, and fully closed slots 3 for squirrel cage conductors are arranged at equal intervals near the outer periphery. Only one of these slots is an open slot 4. This is for driving slots into the opening slots and aligning the slots when assembling the rotor.
After slot alignment, rotor conductors are formed by aluminum die casting. Due to the mixed use of opening slots in this way, the noise level of small models is 3~3~
I have experienced an increase of 5 [dB].
この場合の騒音増大の原因は、磁気振動であ
り、小形機種では固定子鉄心の分布力による多角
形振動固有振動数は、通常2000〜5000〔Hz〕とき
わめて高いが、回転子を含む軸系の固有振動数が
が割合低いため、回転軸に対して非対称の不平衡
磁気吸引力により回転子が共振または強制振動に
より磁気騒音を生ずる。不平衡磁気吸引力の発生
原因としては回転子の偏心とスロツトコンビネー
シヨンが考えられるが、この他磁気回路のアンバ
ランスとか、他の高調波磁束の重畳もある。第１
図の例は、回転子に磁気的アンバランスがあるも
のであり、回転子全体の変位力およびこれによる
磁気騒音が生じる。 The cause of noise increase in this case is magnetic vibration, and in small models, the polygonal vibration natural frequency due to the distributed force of the stator core is usually extremely high, 2000 to 5000 [Hz], but the shaft system including the rotor Since the natural frequency of the rotor is relatively low, the rotor generates magnetic noise due to resonance or forced vibration due to the unbalanced magnetic attraction force that is asymmetric with respect to the rotation axis. Possible causes of unbalanced magnetic attraction are rotor eccentricity and slot combination, but there are also other causes, such as unbalance in the magnetic circuit and the superposition of other harmonic magnetic fluxes. 1st
In the example shown in the figure, there is a magnetic imbalance in the rotor, which causes a displacement force of the entire rotor and magnetic noise due to this.
本考案は大部分が全閉スロツトである中に開口
スロツトを混用しても磁気騒音が殆んど増加しな
い誘導電動機を提供することを目的とする。 It is an object of the present invention to provide an induction motor in which magnetic noise hardly increases even when open slots are used in combination with the fully closed slots.
以下本考案の一実施例について第２図を参照し
て説明する。すなわち回転子鉄心１の軸対称の位
置に開口スロツト４を２ケ所等配する。そうする
と回転軸を中心とする磁気吸引力の多角形分布力
は同一直線状で互に反対の向きでバランスしたも
のとなつて、回転子全体としての変位力は低減さ
れ振動や騒音が低くなる。 An embodiment of the present invention will be described below with reference to FIG. That is, two opening slots 4 are equally distributed at axially symmetrical positions of the rotor core 1. Then, the polygonally distributed forces of the magnetic attraction force centered on the rotating shaft become balanced in the same straight line and in opposite directions, reducing the displacement force of the rotor as a whole and reducing vibration and noise.
次に第３図に示す実施例についてみれば、スロ
ツト数が22であるので、開口スロツトを３個にす
る場合はその開口スロツト４１，４２，４３を等
配にすることが出来ないので、第１の開口スロツ
ト４１を回転子鉄心１の３等分点のうちの一つの
A1に設け、第２，第３の開口スロツト４２，４
３は残りの３等分点のA2，A3から１スロツトピ
ツチ以内の範囲内の位置に設ける。 Next, looking at the embodiment shown in FIG. 3, the number of slots is 22, so if there are three opening slots, the opening slots 4 1 , 4 2 , and 4 3 cannot be equally distributed. Therefore, the first opening slot 41 is located at one of the three equal parts of the rotor core 1.
A 1 is provided with second and third opening slots 4 2 , 4
3 is provided at a position within one slot pitch from the remaining trisecting points A 2 and A 3 .
そうすると磁気吸引力はシヤフト穴２を中心と
する略正３角形となるので、回転軸に対してバラ
ンスしたものとなり、振動や騒音を低くすること
ができる。 In this case, the magnetic attraction force forms a substantially regular triangle with the shaft hole 2 at the center, so it is balanced with respect to the rotation axis, and vibration and noise can be reduced.
次に開口スロツトの数を一般的な数値として、
文字Ｒで表わす場合について説明する。すなわち
Ｒ個の開口スロツトを等配又は等配に近いように
円周をＲ等分した点から１スロツトピツチ以内の
位置に設け、他は全閉スロツトとする。 Next, the number of opening slots is a general value,
The case represented by the letter R will be explained. That is, R open slots are provided at positions within one slot pitch from the point where the circumference is divided into R equal parts so as to be equally distributed or nearly equally distributed, and the other slots are completely closed slots.
一般にこのように開口スロツトと全閉スロツト
とが混在すると回転子表面のパーミアンス（透磁
率）にはリツプルを生じる。パーミアンスリツプ
ル波の次数は一般に全周360゜をｎ等分する場
合、ｎ次と定義されている。Ｒ個の等配の開口ス
ロツトによるパーミアンスリツプル波の分布はＲ
次となる。第２図ではＲ＝２、第３図ではＲ＝３
である。この結果回転子スロツト数をN2（第２
図、第３図ではN2＝22）とすると両者の合成に
より（N2±Ｒ）次のパーミアンス波が生じる。
そのためパーミアンス波に応じて変化した次数の
多角形分布力が生じる。 Generally, when open slots and fully closed slots coexist in this manner, ripples occur in the permeance (magnetic permeability) of the rotor surface. The order of the permian ripple wave is generally defined as the nth order when the entire circumference of 360° is divided into n equal parts. The distribution of permian ripple waves due to R equally spaced aperture slots is R
Next. R=2 in Figure 2, R=3 in Figure 3
It is. As a result, the number of rotor slots is reduced to N 2 (second
In FIG. 3, when N 2 =22), a permeance wave of (N 2 ±R) order is generated by the combination of both.
Therefore, a polygonal distributed force of varying order is generated depending on the permeance wave.
従来のスロツトコンビネーシヨン理論によると
多角形分布力が１次のモードを示す場合は回転子
を全体として変位させる不平衡磁気吸引力で、２
次以上の場合は固定子を多角形変形させる振動力
となる。分布力の次数Ｍを示す式として従来は
Ｍ＝｜N1−N2｜〓2P ……(1)
という式が用いられている。 According to the conventional slot combination theory, if the polygonal distributed force exhibits a first-order mode, it is an unbalanced magnetic attraction force that displaces the rotor as a whole;
If it is greater than or equal to the following, the vibration force will cause the stator to undergo polygonal deformation. Conventionally, the following formula has been used to indicate the order M of the distributed force: M=|N 1 −N 2 |〓2P (1).
但しN1＝固定子スロツト数
N2＝回転子スロツト数
Ｐ＝極対数
であり、計算の仕方はN1とN2の差の絶対値に2P
を加算するか、2Pを減算するか、あるいは2Pを
加算も減算もしない３つの場合を求めるものであ
る。 However, N 1 = number of stator slots N 2 = number of rotor slots P = number of pole pairs, and the calculation method is to calculate the absolute value of the difference between N 1 and N 2 by 2P.
The purpose is to find three cases: adding , subtracting 2P, or neither adding nor subtracting 2P.
そして従来はＭを０又は２以上の値に選んでい
るが、上記したように全閉スロツトの中に開口ス
ロツトを混用した場合は（N2±Ｒ）次のパーミ
アンス波に応じて変化した次数の多角形分布力が
生じることを考慮に入れる必要があり、その開口
スロツトの効果を考慮した場合の多角形分布力次
数M′は実質的に次の第(2)式となる。 Conventionally, M is selected to be 0 or a value of 2 or more, but when an open slot is used in combination with a fully closed slot as described above, the order changes according to the next permeance wave (N 2 ±R). It is necessary to take into account that a polygonally distributed force is generated, and when the effect of the opening slot is taken into account, the polygonally distributed force order M' is substantially expressed by the following equation (2).
M′＝｜N1−N′2｜〓2P ……(2)
但しN′2＝N2±Ｒ
従つてこのM′の値を０又は２以上の数にし
て、１にならないようにすれば振動、騒音を小さ
くすることができる。 M′=｜N 1 −N′ 2 |〓2P ……(2) However, N′ 2 =N 2 ±R Therefore, set the value of M′ to 0 or a number greater than 2 so that it does not become 1. Vibration and noise can be reduced.
因みに第１図に示すように開口スロツトを１個
所設ければ、従来の(1)式によつてＭ＝０又は２と
なるようにしてもＲ＝１であるから(2)式のM′の
値は
M′＝０±１＝±１、
又はM′＝２±１＝１，３
となつてどちらも１次の分布力が発生し、不平衡
磁気吸引力を生じ、回転子の変位振動により磁気
騒音が生じる。 Incidentally, if one opening slot is provided as shown in Fig. 1, even if M = 0 or 2 according to the conventional equation (1), R = 1, so M' in equation (2) The value of is M' = 0 ± 1 = ± 1, or M' = 2 ± 1 = 1,3, and in both cases, a first-order distributed force is generated, an unbalanced magnetic attraction force is generated, and the rotor displacement Vibrations create magnetic noise.
しかし第２図のように開口スロツト数Ｒ＝２と
すれば従来の(1)式によつてＭ＝０又は２となるよ
うにしたものは、
M′＝０±２＝±２、
又はM′＝２±２＝０，４
となり、どちらも１次の分布力が無い。即ち不平
衡磁気吸引力が無いから回転子の変位振動、騒音
の発生が少ない。 However, if the number of opening slots R = 2 as shown in Fig. 2, then M = 0 or 2 using the conventional equation (1), M' = 0 ± 2 = ± 2, or M '=2±2=0,4, and there is no first-order distributed force in either case. That is, since there is no unbalanced magnetic attraction force, there is less displacement vibration of the rotor and less noise.
次に第３図に示すものを６極機に用いればＲ＝
３であるから、従来第(1)式のＭの値を３になるよ
うにしていたものならば第(2)式によるM′の値は
M′＝３±３＝０，６
となつて不平衡磁気吸引力が無いから、これも振
動、騒音の少ない電動機が得られる。 Next, if the one shown in Fig. 3 is used in a six-pole machine, R=
3, so if the value of M in equation (1) was previously set to 3, the value of M' in equation (2) would be M' = 3 ± 3 = 0,6. Since there is no unbalanced magnetic attraction, an electric motor with less vibration and noise can be obtained.
即ち開口スロツトを等配する場合、その数を極
対数の整数倍にすれば不平衡磁気吸引力による騒
音が無くなることが判る。 That is, when the opening slots are equally distributed, it is understood that noise caused by unbalanced magnetic attraction can be eliminated by making the number an integral multiple of the number of pole pairs.
このように(1)式を用いてスロツト数を定めてい
た従来のものを、その抜型を変えないで開口スロ
ツトを混用する場合、本考案を用いれば不平衡磁
気吸引力による騒音を生じることなく、静かでま
た使用寿命の長い誘導電動機を得ることができ
る。 In this way, when using the conventional method in which the number of slots is determined using equation (1) and using open slots without changing the cutting die, the present invention can be used without causing noise due to unbalanced magnetic attraction force. , you can get an induction motor that is quiet and has a long service life.
尚新規に設計するときは、(1)式のＭの事は考え
ずに、(2)式のM′の値のみ考えてやればよいこと
は勿論である。 Of course, when creating a new design, it is sufficient to consider only the value of M' in equation (2) without considering M in equation (1).
第１図は従来の誘導電動機の回転子鉄心の平面
図、第２図および第３図はそれぞれ異なる本考案
の実施例の誘導電動機の回転子鉄心の平面図であ
る。
１……回転子鉄心、２……シヤフト穴、３……
全閉スロツト、４，４１，４２，４３……開口ス
ロツト。
FIG. 1 is a plan view of a rotor core of a conventional induction motor, and FIGS. 2 and 3 are plan views of a rotor core of an induction motor according to different embodiments of the present invention. 1... Rotor core, 2... Shaft hole, 3...
Fully closed slot, 4, 4 1 , 4 2 , 4 3 ... open slot.
Claims (1)
ロツトとを備え、上記の式に示すM′の値が１に
ならず、開口スロツトは前記円周面において等分
割の位置から１スロツトピツチ以内の位置に配置
されたことを特徴とする誘導電動機。 但しM′＝｜N1−N′2｜〓2P N1＝固定子スロツト数 N′2＝N2±Ｒ N2＝回転子スロツト数 Ｒ＝回転子の開口スロツト数 Ｐ＝極対数 とする。[Claims for Utility Model Registration] A squirrel cage rotor is provided with fully closed slots and open slots on the circumferential surface, and the value of M' shown in the above equation is not 1, and the open slots are provided on the circumferential surface. An induction motor characterized in that the induction motor is arranged at a position within one slot pitch from the equally divided position. However, M' = |N 1 -N' 2 | 2P N 1 = Number of stator slots N' 2 = N 2 ±R N 2 = Number of rotor slots R = Number of rotor opening slots P = Number of pole pairs .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977027460U JPS6110460Y2 (en) | 1977-03-09 | 1977-03-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977027460U JPS6110460Y2 (en) | 1977-03-09 | 1977-03-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53123112U JPS53123112U (en) | 1978-09-30 |
| JPS6110460Y2 true JPS6110460Y2 (en) | 1986-04-03 |
Family
ID=28871611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977027460U Expired JPS6110460Y2 (en) | 1977-03-09 | 1977-03-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6110460Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11101723B2 (en) | 2015-10-01 | 2021-08-24 | Mitsubishi Electric Corporation | Three-phase induction motor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49101806A (en) * | 1973-02-02 | 1974-09-26 |
-
1977
- 1977-03-09 JP JP1977027460U patent/JPS6110460Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49101806A (en) * | 1973-02-02 | 1974-09-26 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11101723B2 (en) | 2015-10-01 | 2021-08-24 | Mitsubishi Electric Corporation | Three-phase induction motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53123112U (en) | 1978-09-30 |
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