JPH0723028Y2 - Brushless motor - Google Patents
Brushless motorInfo
- Publication number
- JPH0723028Y2 JPH0723028Y2 JP1986110122U JP11012286U JPH0723028Y2 JP H0723028 Y2 JPH0723028 Y2 JP H0723028Y2 JP 1986110122 U JP1986110122 U JP 1986110122U JP 11012286 U JP11012286 U JP 11012286U JP H0723028 Y2 JPH0723028 Y2 JP H0723028Y2
- Authority
- JP
- Japan
- Prior art keywords
- main magnetic
- pole
- magnetic poles
- stator
- poles
- 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 - Lifetime
Links
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- Brushless Motors (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 この考案は磁石を有する回転子と２相半波または単相全
波巻線を巻回した鉄心を有する固定子を備えたブラシレ
スモータに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a brushless motor provided with a rotor having a magnet and a stator having an iron core wound with two-phase half-wave or single-phase full-wave windings. Is.
第３図および第４図は例えば実開昭58−143486号公報に
示されたブラシレスモータの概略構成図および回路図で
あり，図において，（１）は回転子で，鉄等の磁性体で
カツプ状に形成された回転子ヨーク（２）の内周に弧状
の磁石（3a）〜（3d）をリング状に並べて設けるととも
に，底壁部の中央部に図示しないフレームに回転自在に
支持される回転軸（４）を設けて形成されている。
（５）は回転子（１）の内側に配設された固定子で,90
°の等角度間隔で継鉄部（６）から放射状に突設された
４個の主磁極（7a）〜（7d）とこれらを磁極相互間にそ
れぞれ１個ずつ設けられた４個の補極（8a）〜（8d）と
から成る固定子鉄心（９）を備え，主磁極（7a）〜（7
d）は継鉄部（６）から放射状に延びる歯部（９）と，
この歯部の先端に形成され該歯部の中心に対して対称に
形成された極片部（10）とから成り，これら主磁極（7
a）〜（7d）の歯部に巻回された巻線（11a）〜（11d）
が２相に結線されている。補極（8a）〜（8d）は主磁極
相互間の中央位置に配設されて継鉄部（６）から放射状
に延びる歯部（12）と，この歯部の先端部に形成された
極片部（13）とから成り，極片部（13）は歯部の中心に
対して非対称に設けられている。（14）は位置検出素子
であり，このようにしてなるプラシレスモータの駆動回
路は第４図のように設けられている。この駆動回路にお
いては位置検出器（この例ではホール素子）（14）の出
力が比較器CMPに入力され，比較器CMPの出力端子の電位
は検出器（14）がＮ極に対向したときに高レベルにな
り,S極に対向したときに低レベルになる。L1及びL2はそ
れぞれＡ相及びＢ相の巻線で，これらの巻線にはそれぞ
れトランジスタQ1及びQ2のコレクタエミツタ間回路が直
列に接続されている。巻線L1とトランジスタQ1の直列回
路及び巻線L2とトランジスタQ2の直列回路は直流電源の
両端に並列接続され，トランジスタQ1のベースには比較
器CMPの出力が供給されている。またトランジスタQ2の
ベースには比較器CMPの出力がインバータINVを介して与
えられている。したがつて検出器（14）が磁石回転子の
Ｎ極に対向して比較器CMPの出力端子が高電位になつた
ときにはトランジスタQ1が導通してＡ相の巻線L1に電流
が流れる。また検出器（14）が磁石回転子のＳ極と対向
して比較器CMPの出力端子が低電位になつたときにはイ
ンバータINVの出力端子が高電位になつてトランジスタQ
2が導通し,B相の巻線L2に電流が流れるようになつてい
る。3 and 4 are schematic configuration diagrams and circuit diagrams of a brushless motor disclosed in, for example, Japanese Utility Model Laid-Open No. 58-143486, in which (1) is a rotor, which is a magnetic substance such as iron. Arc-shaped magnets (3a) to (3d) are arranged side by side in a ring shape on the inner circumference of a rotor yoke (2) formed in a cup shape, and rotatably supported by a frame (not shown) at the center of the bottom wall. It is formed by providing a rotating shaft (4).
(5) is a stator arranged inside the rotor (1),
Four main magnetic poles (7a) to (7d) radially projecting from the yoke portion (6) at equal angular intervals of 4 °, and four auxiliary poles each provided between the magnetic poles. A stator core (9) composed of (8a) to (8d) is provided, and main magnetic poles (7a) to (7) are provided.
d) is a tooth portion (9) that extends radially from the yoke portion (6),
A pole piece portion (10) formed at the tip of the tooth portion and symmetrically formed with respect to the center of the tooth portion.
Windings (11a) to (11d) wound around the teeth of a) to (7d)
Are connected in two phases. The auxiliary poles (8a) to (8d) are arranged at the central positions between the main magnetic poles and have teeth (12) radially extending from the yoke portion (6) and poles formed at the tips of the teeth. The pole piece (13) is provided asymmetrically with respect to the center of the tooth. (14) is a position detecting element, and the drive circuit of the thus-obtained plasticless motor is provided as shown in FIG. In this drive circuit, the output of the position detector (Hall element in this example) (14) is input to the comparator CMP, and the potential of the output terminal of the comparator CMP is when the detector (14) faces the N pole. It becomes high level, and becomes low level when facing the south pole. L 1 and L 2 are A-phase and B-phase windings, respectively, and collector-emitter circuits of transistors Q 1 and Q 2 are connected in series to these windings. The series circuit of winding L 1 and transistor Q 1 and the series circuit of winding L 2 and transistor Q 2 are connected in parallel at both ends of the DC power supply, and the output of comparator CMP is supplied to the base of transistor Q 1 . . The output of the comparator CMP is given to the base of the transistor Q 2 via the inverter INV. Therefore, when the detector (14) faces the N pole of the magnet rotor and the output terminal of the comparator CMP becomes a high potential, the transistor Q 1 becomes conductive and a current flows through the A-phase winding L 1. . When the detector (14) faces the south pole of the magnet rotor and the output terminal of the comparator CMP becomes low potential, the output terminal of the inverter INV becomes high potential and the transistor Q
2 becomes conductive and current flows in the B-phase winding L 2 .
従来のブラシレスモータは上記のように構成され，位置
検出器（14）がＮ極に対向しているときには,A相の巻線
L1に電流が流れて主磁極（7a），（7b），（7c）及び
（7d）がそれぞれN,S,N及びＳの極性に励磁され，これ
らの主磁極が回転子の磁極を吸引または反発して回転子
（１）を時計方向に回転させる。次に位置検出器（14）
にＳ極が対向するとＢ相の巻線L2に電流が流れ，主磁極
（7a），（7b），（7c）及び（7d）がそれぞれS,N,S及
びＮの極性に励磁され，回転子を同様に時計方向に回転
させる。回転子（１）の磁極の中心と固定子（５）の主
磁極の中心とが一致するときには，巻線L1及びL2のいず
れに電流が流れても，巻線電流による回転力は零である
が，この場合は主磁極相互間の中心位置に対し非対称に
形成配置した補極（8a）〜（8d）と回転子の磁極との間
の吸引力により時計回転方向のトルク（リラクタンスト
ルク）を生じる。したがつて回転子がいかなる位置にあ
つてもトルクが零になることはなく，電動機は回転を続
け，停止時には必ず起動時に時計方向のトルクが生ずる
位置に停止し，再起動が可能となる。The conventional brushless motor is configured as described above, and when the position detector (14) faces the N pole, the A phase winding
A current flows through L 1 and main poles (7a), (7b), (7c) and (7d) are excited to the polarities of N, S, N and S, respectively, and these main poles attract the magnetic pole of the rotor. Alternatively, repulsion causes the rotor (1) to rotate clockwise. Next position detector (14)
When the S pole is opposite to, a current flows through the B-phase winding L 2 and the main magnetic poles (7a), (7b), (7c) and (7d) are excited to the polarities of S, N, S and N, respectively. Rotate the rotor clockwise as well. When the center of the magnetic pole of the rotor (1) and the center of the main magnetic pole of the stator (5) coincide with each other, the rotating force due to the winding current is zero regardless of the current flowing through either of the windings L 1 and L 2. However, in this case, the torque in the clockwise direction (reluctance torque) is generated by the attractive force between the magnetic poles of the rotor and the auxiliary poles (8a) to (8d) that are arranged asymmetrically with respect to the center position between the main magnetic poles. ) Occurs. Therefore, the torque does not become zero regardless of the position of the rotor, the motor continues to rotate, and when stopped, it always stops at the position where a clockwise torque is generated at the time of start, and restart is possible.
上記のような従来のブラシレスモータでは，主磁極の極
片部（10）と補極の極片部（13）との空隙（15a）は小
さい程良いが，これは巻線（11a）〜（11d）の関係から
所定幅以下にはできない。この空隙（15a）および主磁
極の極片部（10）の広がりを30°一定とし，補極の歯部
の幅を固定子（５）外径に比例するものとして，固定子
（５）の外径を変えた場合の空隙（15a）と主磁極の極
片部（10）と補極の歯部（12）端部との空隙（15b）の
比率を示すと第２図の（Ａ）のようになる。この図から
解るように，固定子（５）の外径が小さくなればなるほ
ど，空隙（15a）と空隙（15b）の比率は１に近くなり，
これに伴つてリラクタンストルクは小さくなり起動特性
が低下する。また，補極の極片部（13）が非対称に形成
されていることから特に外径の小さな固定子（５）では
強度が低く，プレスによる打抜き時変形し易い問題点が
あつた。In the conventional brushless motor as described above, the smaller the gap (15a) between the pole piece (10) of the main pole and the pole piece (13) of the auxiliary pole, the better. Due to the relationship of 11d), it cannot be less than the specified width. The gap between the air gap (15a) and the pole piece (10) of the main pole is fixed at 30 °, and the width of the tooth portion of the auxiliary pole is proportional to the outer diameter of the stator (5). The ratio of the air gap (15a) and the air gap (15b) between the pole piece (10) of the main pole and the teeth (12) of the auxiliary pole when the outer diameter is changed is shown in Fig. 2 (A). become that way. As can be seen from this figure, the smaller the outer diameter of the stator (5), the closer the ratio of the void (15a) to the void (15b) becomes,
Along with this, the reluctance torque becomes small and the starting characteristic deteriorates. In addition, since the pole piece (13) of the commutating pole is formed asymmetrically, the stator (5) having a particularly small outer diameter has a low strength and is easily deformed during punching by a press.
この考案は，かかる問題点を解決するためになされたも
ので，固定子の外径が小さくてもリラクタンストルクを
損うことなく，極片部の強度も高いブラシレスモータを
得ることを目的とするものである。The present invention was made in order to solve such a problem, and an object thereof is to obtain a brushless motor having a high strength pole piece portion without impairing reluctance torque even if the outer diameter of the stator is small. It is a thing.
この考案に係るブラシレスモータは，補極を根元が主磁
極間のほぼ中央に設けられ，先端部が一方の主磁極に近
づくとともに，他方の主磁極から離れるように所定の曲
率に湾曲形成したものである。The brushless motor according to the present invention is one in which the base of the auxiliary pole is provided substantially in the center between the main magnetic poles, and the tip end is curved to a predetermined curvature so as to approach one main magnetic pole and move away from the other main magnetic pole. Is.
この考案においては，空隙比15a/15bが大きくリラクタ
ンストルクを大きくできるから起動性特性が良好になる
とともに，所定の曲率に湾曲形成されていることからプ
レスによる打抜き時のせん断力のバランスが良く変形し
難くなる。In this invention, since the void ratio 15a / 15b is large and the reluctance torque can be increased, the starting property is good, and the curved shape is formed to have a predetermined curvature, so that the shear force during punching by the press is well-balanced and deformed. Hard to do.
第１図はこの考案の一実施例を示す概略構成図であり，
補極（8a）〜（8d）以外は上記従来例と同一または相当
部分を示す。（20a）〜（20d）は主磁極（7a）〜（7d）
相互間にそれぞれ１個ずつ設けられた補極で，その根元
部（21）は主磁極間のほぼ中央に設けられ，先端部（2
2）は一方の主磁極に近づくとともに，他方の主磁極か
ら離れるようほぼ同一の幅になるよう所定の曲率で形成
されている。なお，駆動回路は従来と同様に設けられて
いる。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention,
Except for the commutating poles (8a) to (8d), the same or corresponding parts as those of the above conventional example are shown. (20a) to (20d) are main magnetic poles (7a) to (7d)
One auxiliary pole is provided between each other, and its root portion (21) is provided approximately in the center between the main magnetic poles and the tip portion (2).
2) is formed with a predetermined curvature so as to have a substantially same width so as to approach one main magnetic pole and move away from the other main magnetic pole. The drive circuit is provided as in the conventional case.
上記のように構成されたブラシレスモータにおいては，
従来と同様に駆動し回転する。起動については，補極
（20a）〜（20d）先端部（22）の主磁極の近づいた巻線
に必要な空隙（15a）と主磁極と離れた側の空隙（15b）
との比率が，第２図（Ｂ）で示す曲線となり，固定子
（５）の外径が小さくなつても大きなものとなる。従つ
て，リラクタンストルクは固定子の外径が小さくても充
分に得られることから起動特性は良好になる。また，固
定子（５）のプレス打抜き時には，補極（20a）〜（20
d）がほぼ同一の幅で所定の曲率で形成されていること
から，せん断力のバランスがよく変形はし難いものとな
る。In the brushless motor configured as above,
It is driven and rotated in the same way as in the past. As for starting, the air gap (15a) required for the winding near the main pole at the tips (22a) to (20d) of the auxiliary poles (20a) and the air gap (15b) on the side away from the main pole
The ratio of and becomes a curve shown in FIG. 2 (B), and becomes larger even if the outer diameter of the stator (5) becomes smaller. Therefore, the reluctance torque can be obtained sufficiently even if the outer diameter of the stator is small, so that the starting characteristics are good. Also, when punching the stator (5) with a press, the commutating poles (20a) to (20
Since d) is formed with almost the same width and a predetermined curvature, the shear force is well balanced and deformation is difficult.
この考案は以上説明したとおり，各補極を根元部が主磁
極間のほぼ中央に設けられ，先端部が一方の主磁極に近
づくとともに，他方の主磁極から離れるように所定の曲
率に湾曲形成したことにより、補極と隣接する各主磁極
との先端部相互間の空隙の小さい方と大きい方との空隙
比が，固定子の外径に拘らず大きく維持でき，巻線スペ
ースを損うことなく，リラクタンストルクが充分得られ
起動特性の良好なものとなる効果がある。As described above, in the present invention, each of the auxiliary poles has a root portion formed substantially in the center between the main magnetic poles, and the tip portion is curved to have a predetermined curvature so as to approach the one main magnetic pole and move away from the other main magnetic pole. As a result, the air gap ratio between the smaller gap and the larger gap between the tips of the auxiliary pole and the adjacent main magnetic poles can be maintained large regardless of the outer diameter of the stator, and the winding space is impaired. Without this, there is an effect that a sufficient reluctance torque is obtained and the starting characteristic is good.
第１図はこの考案の一実施例を示す概略構成図，第２図
はこの考案と従来例との空隙比15a/15bを比較するグラ
フ図，第３図は従来のブラシレスモータを示す概略構成
図，第４図はその回路図である。 なお，各図中同一符号は同一または相当部分を示し，
（１）は回転子，（3a）〜（3d）は磁石，（５）は固定
子，（7a）〜（7d）は主磁極，（11a）〜（11d）は巻
線，（15a）（15b）は空隙，（20a）〜（20d）は補極，
（21）は根元部，（22）は先端部である。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a graph diagram comparing a void ratio 15a / 15b of the present invention and a conventional example, and FIG. 3 is a schematic configuration showing a conventional brushless motor. FIG. 4 and FIG. 4 are the circuit diagrams. In addition, in each figure, the same reference numerals indicate the same or corresponding parts,
(1) is a rotor, (3a) to (3d) are magnets, (5) is a stator, (7a) to (7d) are main magnetic poles, (11a) to (11d) are windings, (15a) ( 15b) is a void, (20a) to (20d) is a pole,
(21) is the root, and (22) is the tip.
Claims (2)
と，この複数の主磁極間に配設され，回転方向に隣接す
る上記主磁極に対する方が，反対方向に隣接する上記主
磁極に対するより，先端部相互間の空隙が大きく構成さ
れた補極を有する固定子鉄心の上記主磁極にそれぞれ巻
線を巻回した固定子と，この固定子と対向する磁石を設
けた回転子とを備え，上記各補極を，この補極と隣接す
る上記各主磁極との先端部相互間の空隙の小さい方と大
きい方との空隙比が，固定子の外径に拘らず大きく維持
できるように，その根元部が上記主磁極間のほぼ中央に
有り，先端部が一方の上記主磁極に漸近し，他方の上記
主磁極に乖離するように所定の曲率に湾曲させたことを
特徴とするブラシレスモータ。1. A plurality of main magnetic poles arranged at equal angular intervals, and the main magnetic poles arranged between the plurality of main magnetic poles, which are adjacent to each other in the rotation direction, are adjacent to each other in the opposite direction. A stator in which a winding is wound around each of the main magnetic poles of a stator core having a compensating pole whose gap between the tip portions is larger than that of the magnetic pole, and a rotor provided with a magnet facing the stator. And each of the above-mentioned auxiliary poles maintains a large air-gap ratio between the smaller one and the larger one of the tips between the main poles adjacent to each other and the main pole regardless of the outer diameter of the stator. It is characterized in that its root portion is located approximately in the center between the main magnetic poles, and that the tip portion is asymptotically closer to one of the main magnetic poles and is curved to have a predetermined curvature so as to be separated from the other main magnetic pole so as to be possible. And brushless motor.
する実用新案登録請求の範囲第１項記載のブラシレスモ
ータ。2. The brushless motor according to claim 1, wherein the windings are connected in two phases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986110122U JPH0723028Y2 (en) | 1986-07-18 | 1986-07-18 | Brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986110122U JPH0723028Y2 (en) | 1986-07-18 | 1986-07-18 | Brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6317572U JPS6317572U (en) | 1988-02-05 |
| JPH0723028Y2 true JPH0723028Y2 (en) | 1995-05-24 |
Family
ID=30988850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986110122U Expired - Lifetime JPH0723028Y2 (en) | 1986-07-18 | 1986-07-18 | Brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723028Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8035325B2 (en) | 2006-08-21 | 2011-10-11 | Seiko Epson Corporation | Single-phase brushless motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61114979U (en) * | 1984-12-26 | 1986-07-21 |
-
1986
- 1986-07-18 JP JP1986110122U patent/JPH0723028Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6317572U (en) | 1988-02-05 |
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