JPH02197246A - Brushless motor - Google Patents
Brushless motorInfo
- Publication number
- JPH02197246A JPH02197246A JP1717989A JP1717989A JPH02197246A JP H02197246 A JPH02197246 A JP H02197246A JP 1717989 A JP1717989 A JP 1717989A JP 1717989 A JP1717989 A JP 1717989A JP H02197246 A JPH02197246 A JP H02197246A
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- position detection
- magnetically sensitive
- sensitive element
- housing
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 58
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract 6
- 230000000717 retained effect Effects 0.000 abstract 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 11
- 229920003002 synthetic resin Polymers 0.000 description 9
- 239000000057 synthetic resin Substances 0.000 description 9
- 239000007769 metal material Substances 0.000 description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000004323 axial length Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 241000283973 Oryctolagus cuniculus Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Brushless Motors (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、回転子の永久磁石とは別体に、位置検知用磁
石を有する無刷子電動機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brushless electric motor having a position detection magnet separate from the permanent magnet of the rotor.
［従来の技術］
この種の無刷子電動機は、第６図の如きものが一般的で
ある。すなわち回転子１は、回転子軸２とこれの外周に
固着されたヨーク３とこれの外周に固着された永久磁石
４よりなる。固定子５は、回転子１の外周を円筒状に囲
み、回転子１の外周に向けて突出した複数の磁極子６，
６．−の周囲に絶縁部材７を介してコイル８を巻回して
なる。[Prior Art] This type of brushless electric motor is generally shown in FIG. That is, the rotor 1 includes a rotor shaft 2, a yoke 3 fixed to the outer periphery of the rotor shaft 2, and a permanent magnet 4 fixed to the outer periphery of the rotor shaft 2. The stator 5 surrounds the outer periphery of the rotor 1 in a cylindrical shape, and includes a plurality of magnetic pole pieces 6 that protrude toward the outer periphery of the rotor 1.
6. A coil 8 is wound around - with an insulating member 7 in between.
この固定子５は、非磁性金属材料製の有底円筒状をした
ハウジング９の内周壁に一定保持される。The stator 5 is fixedly held on the inner circumferential wall of a housing 9 made of a non-magnetic metal material and having a cylindrical shape with a bottom.
ハウジング９の開口部には、非磁性金属材料製の軸受台
１０がこれを閉塞するように装着固定され、ハウジング
９と軸受台１０に設けた軸受１１１１により、回転子ｌ
の回転子軸２が回転可能に保持される。A bearing pedestal 10 made of a non-magnetic metal material is attached and fixed to the opening of the housing 9 so as to close the opening.
A rotor shaft 2 is rotatably held.
ハウジング９と軸受台１０にて形成されるスペースＳに
は、回転子１の永久磁石４部分が収容されているが、回
転子軸２は軸受台１０を道通して突出しており、その回
転子軸２に位置検知用磁石１２が設けである。そして位
置検知用磁石１２に対面して磁気感応素子１３が配設さ
れる。１４は非磁性金属材料製の検知部カバーである。The space S formed by the housing 9 and the bearing pedestal 10 accommodates 4 parts of the permanent magnet of the rotor 1, but the rotor shaft 2 protrudes through the bearing pedestal 10, and the rotor A position detection magnet 12 is provided on the shaft 2. A magnetically sensitive element 13 is disposed facing the position detecting magnet 12. 14 is a detection part cover made of a non-magnetic metal material.
［発明が解決しようとする課題］
近年、無刷子電動機は、小型化や高出力化が要求されて
きており、従って電動機自体は高温になりやすい。とこ
ろで、ボール素子のような磁気感応素子は、高温になる
につれ検知感度が低下するものである。例えばホール素
子の場合、使用温度範囲は一５５°Ｃか・ら１２５°Ｃ
であり、この範囲を超えると磁気感応素子の検知感度が
低下し、そうなるとコイルへの通電制御が正禽に行われ
難く、従って電動機の正席な回転が望めなくなる。[Problems to be Solved by the Invention] In recent years, brushless motors have been required to be smaller and have higher output, and therefore the motors themselves tend to become hotter. By the way, the detection sensitivity of a magnetically sensitive element such as a ball element decreases as the temperature increases. For example, in the case of a Hall element, the operating temperature range is -55°C to 125°C.
When this range is exceeded, the detection sensitivity of the magnetically sensitive element decreases, and in this case, it is difficult to control the energization to the coil in a proper manner, and therefore, it becomes impossible to expect the motor to rotate in a proper manner.
上記した従来例のものでは、発熱源であるコイル８と磁
気感応素子１３とを、その間に軸受台１０を介在させる
ことにより熱的に遮蔽する効果を期待している。In the conventional example described above, the effect of thermally shielding the coil 8 and the magnetically sensitive element 13, which are heat generating sources, by interposing the bearing stand 10 therebetween is expected.
しかしながら従来例のものでは、仮に軸受台を合成樹脂
製にしたとしても、回転子軸２が軸受台１０を貫通して
検知部カバー１４内に侵入してきているため、これを介
し、そして対流により熱伝導が行われることを防ぐこと
はできない。また、軸受台１０が高温になった場合、そ
の熱が熱伝導率の高い検知部カバーに伝導してその内部
の温度を上昇させることも防げない。従って磁気感応素
子１３の温度上昇の抑制は、まだ十分とは言えないので
ある。However, in the conventional example, even if the bearing pedestal is made of synthetic resin, the rotor shaft 2 penetrates the bearing pedestal 10 and enters the detection part cover 14. It is not possible to prevent heat conduction from occurring. Further, when the bearing stand 10 becomes high in temperature, it is impossible to prevent the heat from being conducted to the detection part cover having high thermal conductivity and increasing the temperature inside thereof. Therefore, suppression of the temperature rise of the magnetically sensitive element 13 cannot be said to be sufficient.
本発明は、上記事由に鑑みてなしたもので、その目的と
するところは、磁気感応素子の温度上昇香抑制すること
により磁気感応素子の感度の低下が抑制できる無刷子電
動機の提供にある。The present invention has been made in view of the above reasons, and an object thereof is to provide a brushless electric motor that can suppress a decrease in the sensitivity of a magnetically sensitive element by suppressing the rise in temperature of the magnetically sensitive element.
［課題を解決するための手段］
か□かる課題を解決するために、請求項（１１の無刷子
電動機は、位置検知用磁石と磁気感応素子との間に対流
遮蔽部材を介在させである。[Means for Solving the Problems] In order to solve the above problems, the brushless motor according to claim 11 has a convection shielding member interposed between the position detection magnet and the magnetically sensitive element.
請求項（２）の無刷子電動機は、位置検知用磁石と磁気
感応素子とからなる検知部を合成樹脂製部材にて被って
いる。In the brushless electric motor according to claim (2), a detection section consisting of a position detection magnet and a magnetically sensitive element is covered with a synthetic resin member.
［作用］
請求項（］）記載の無刷子電動機は、回転子軸や位置検
知用硝石が高温となって検知部カバー内が温度上昇して
も、そのカバー内の高温の空気は対流遮蔽部材により磁
気感応素子に直接触れることがなく、従って磁気感応素
子の温度上昇を抑制できる。[Function] In the brushless electric motor described in claim ( ), even if the rotor shaft or the saltpetre for position detection becomes high temperature and the temperature inside the detection part cover rises, the high temperature air inside the cover is removed by the convection shielding member. This prevents direct contact with the magnetically sensitive element, thereby suppressing the temperature rise of the magnetically sensitive element.
請求項（２）記載の無刷子電動機は、ハウジングと軸受
台にて形成されるスペース内の温度が上昇し、その結果
軸受台が高温になっても、検知用磁石と磁気感応素子か
らなる検知部を被う合成樹脂製部材により熱伝導が抑制
でき、従って磁気感応素子の温度上昇を抑制できる。In the brushless electric motor according to claim (2), even if the temperature in the space formed by the housing and the bearing pedestal increases, and as a result the bearing pedestal becomes high temperature, the brushless electric motor is provided with a detection magnet made of a detection magnet and a magnetically sensitive element. Heat conduction can be suppressed by the synthetic resin member covering the part, and therefore, the temperature rise of the magnetically sensitive element can be suppressed.
［実施例］
以下、請求項（１）記載の発明の一実施例を第１図に基
づいて説明する。なお、第６図に示した従来の技術の部
材と実質的に同一の部材には、同一の符号を付している
。[Example] Hereinafter, an example of the invention described in claim (1) will be described based on FIG. 1. Note that members that are substantially the same as those of the conventional technique shown in FIG. 6 are given the same reference numerals.
回転子１ば、回転子軸２とこれの外周に固着されたヨー
ク３とこれの外周に固着された永久磁石４よりなる。コ
ーク３は、磁性材料にて回転子軸２より軸方向長さが短
い円筒状に形成されて、回転子軸２に圧入あるいは接着
される。永久磁石４は、円筒状あるいは複数個の円弧状
にセグメントされてスリーブ３の外周面に接着剤等によ
り接着しである。この永久磁石４は、径方向に異極が着
磁されており、全体的にはその外周に交互にかつ等間隔
に異極（本実施例では４極）が存在するように配設され
る。The rotor 1 consists of a rotor shaft 2, a yoke 3 fixed to the outer periphery of the rotor shaft 2, and a permanent magnet 4 fixed to the outer periphery of the rotor shaft 2. The coke 3 is formed of a magnetic material into a cylindrical shape having a shorter axial length than the rotor shaft 2, and is press-fitted or bonded to the rotor shaft 2. The permanent magnet 4 is segmented into a cylindrical shape or into a plurality of arc shapes and is adhered to the outer peripheral surface of the sleeve 3 with an adhesive or the like. This permanent magnet 4 is magnetized with different poles in the radial direction, and is arranged so that the different poles (4 poles in this embodiment) are present alternately and at equal intervals on the entire outer circumference. .
固定子５は、珪素鋼板のような磁性材料を打ち抜き積層
してなるもので、基本的には回転子１の外周を円筒状に
囲みかつ回転子１の外周面に向けて突出した複数（本実
施例では６個）の磁極子６６、−を有する。さらにこの
磁極子６の周囲には、絶縁部材７を介してコイル８が巻
回される。The stator 5 is formed by punching and laminating magnetic materials such as silicon steel plates, and basically surrounds the outer periphery of the rotor 1 in a cylindrical shape and includes a plurality of (mains) protruding toward the outer circumferential surface of the rotor 1. In the embodiment, there are six magnetic pole pieces 66, -. Further, a coil 8 is wound around the magnetic pole piece 6 with an insulating member 7 interposed therebetween.
このコイル８は、引き出し線により図外駆動回路に接続
される。This coil 8 is connected to a drive circuit (not shown) by a lead wire.
ハウジング９は、非磁性材料にて有底円筒状に形成され
、上記の固定子５がその内周壁に圧入等により固定保持
される。またハウジング９の底部中央には、軸受１１が
装着される。The housing 9 is formed of a non-magnetic material into a cylindrical shape with a bottom, and the stator 5 is fixedly held on the inner circumferential wall of the housing 9 by press-fitting or the like. Further, a bearing 11 is attached to the center of the bottom of the housing 9.
軸受台１０は、非磁性金属材料にて形成され、ハウジン
グ９の開１コ部にこれを閉塞するように装着固定される
。また軸受台１０の中央には、軸受１１が装着されてお
り、従って回転子軸２はハウジング９と軸受台１０の軸
受１１．１１により回転可能に保持される。The bearing stand 10 is made of a non-magnetic metal material, and is fixedly attached to the opening of the housing 9 so as to close the opening. Further, a bearing 11 is mounted in the center of the bearing pedestal 10, so that the rotor shaft 2 is rotatably held by the housing 9 and the bearings 11, 11 of the bearing pedestal 10.
位置検知用磁石１２は、円板状であって回転子１の永久
磁石４と同様のパターンに着磁されており、軸受台１０
を貫通して突出した回転子軸２に圧入あるいは接着等に
より固定される。The position detection magnet 12 is disc-shaped and magnetized in the same pattern as the permanent magnet 4 of the rotor 1, and
The rotor shaft 2 is fixed to the rotor shaft 2 which protrudes through the rotor shaft 2 by press-fitting or gluing.
検知部カバー１４は、非磁性金属材料により、ハウジン
グ９の内径より小さいが、検知用磁石Ｉ２の外径より十
分大きい内径を有する有底円筒状に形成され、検知用磁
石１２を被うようにして軸受台１０に取着される。１４
ａは底部中央に設けた貫通孔で、回転子軸２の先端部が
厚さの半分程度まで入り込んでいる。The detection part cover 14 is formed of a non-magnetic metal material into a bottomed cylindrical shape having an inner diameter smaller than the inner diameter of the housing 9 but sufficiently larger than the outer diameter of the detection magnet I2, and is configured to cover the detection magnet 12. and is attached to the bearing stand 10. 14
A is a through hole provided at the center of the bottom, into which the tip of the rotor shaft 2 enters to about half the thickness.
ホール素子のような磁気感応素子１３は、検知用磁石１
２の極性検知が可能なように、検知用磁石１２の外周に
対面するよう配設される。具体的には、軸受台１０の底
部に装備された結線用基板１０ａに設けられる。この磁
気感応素子１３と検知用磁石１２とにより、検知部Ｒが
構成される。A magnetically sensitive element 13 such as a Hall element is connected to the detection magnet 1
It is arranged so as to face the outer periphery of the detection magnet 12 so that the polarity of the detection magnet 12 can be detected. Specifically, it is provided on a wiring board 10a provided at the bottom of the bearing stand 10. This magnetic sensing element 13 and the detection magnet 12 constitute a detection section R.
また、磁気感応素子１３の検知信号は、信号線１３ａに
より図外駆動回路に入力される。Further, the detection signal of the magnetically sensitive element 13 is inputted to a drive circuit (not shown) through a signal line 13a.
１５は対流遮蔽部材で、検知用磁石１２と磁気感応素子
１３間に介在して各部材１２．１３が存在するスペース
を遮蔽するべく、合成樹ＪＪＦＩのような非磁性Ｈ料に
て円筒状に形成される。具体的には、厚さを０．１ｍｍ
乃Ｖ ０．５ｍｍ、内径を検知用磁石１２の外径より
若干大きく、軸方向長さを軸受台１０と検知部カバー１
４の底部間より若干長くする。また、軸受台１０と検知
部カバー１４の底部に、対流遮蔽部材１５が嵌合し得る
環状溝１０Ｃ１４、Ｃを設けて両端部を嵌合させる。な
お、対流遮蔽部材■５と磁気感応素子１３間の隙間は、
０．１ｍｍ乃至０ 、３ｍｍ程度となる。Reference numeral 15 denotes a convection shielding member, which is interposed between the detection magnet 12 and the magnetically sensitive element 13 and is made of a non-magnetic H material such as synthetic wood JJFI in order to shield the space in which each member 12.13 exists. It is formed. Specifically, the thickness is 0.1mm.
V 0.5 mm, the inner diameter is slightly larger than the outer diameter of the detection magnet 12, and the axial length is the same as the bearing stand 10 and the detection part cover 1.
Make it slightly longer than the distance between the bottoms of 4. Furthermore, annular grooves 10C14 and 10C into which the convection shielding member 15 can be fitted are provided at the bottoms of the bearing stand 10 and the detection part cover 14, and both ends thereof are fitted. Note that the gap between the convection shielding member ■5 and the magnetic sensing element 13 is as follows:
It is about 0.1 mm to 0.3 mm.
しかして、磁気感応素子１３は、検知用磁石１２の極性
を検知することにより回転子１の位置検知を行い、その
検知信号により作動する図外駆動回路がコイル８への通
電を制御する。The magnetically sensitive element 13 detects the position of the rotor 1 by detecting the polarity of the detection magnet 12, and a drive circuit (not shown) activated by the detection signal controls energization of the coil 8.
なお、磁気感応素子１３が軸方向において検知用磁石１
２の端面に対面する形式のものにあっては、検知用磁石
１２と磁気感応素子１３とが遮蔽できるように、対流５
ａ蔽部材１５を有底円筒状等に変更すればよい。Note that the magnetic sensing element 13 is axially aligned with the detection magnet 1.
2, the convection 5
The a-shielding member 15 may be changed to a cylindrical shape with a bottom or the like.
第２図及び第３図は、請求項（１）記載の発明の別の実
施例で、先の実施例とは実質的には対流遮蔽部材の形状
のみ異なる。従ってこれ以外の部材には、先の実施例と
同一の符号を付して詳細な説明は省略する。FIGS. 2 and 3 show another embodiment of the invention set forth in claim (1), which is substantially different from the previous embodiment only in the shape of the convection shielding member. Therefore, members other than these are given the same reference numerals as in the previous embodiment, and detailed description thereof will be omitted.
このものの対流遮蔽部ヰＡ２５ば、合成樹脂材料により
、磁気感応素子１３のみを略ずつぼり収容できる程度の
一面開口の箱状に形成される。また開口縁には鍔２５ａ
、２５ａが連設されており、これが結線用基板１０ａに
接合される。このものも、検知用磁石１２と磁気感応素
子１３間に介在する箇所の厚さを０．１ｍｍ乃至０．５
ｍｍとし、その他の箇所は適宜の寸法にすればよい。The convection shielding part A25 is formed of a synthetic resin material into a box-like shape with an opening on one side that can accommodate only the magnetically sensitive element 13. Also, the edge of the opening has a flange 25a.
, 25a are connected in series, and these are joined to the wiring board 10a. In this case, the thickness of the portion interposed between the detection magnet 12 and the magnetically sensitive element 13 is set to 0.1 mm to 0.5 mm.
mm, and other portions may be set to appropriate dimensions.
次に、請求項（２）記載の発明の一実施例を第４図に基
づいて説明する。このものは、従来例のものとは実質的
には検知カバーの材質のみが異なる。Next, an embodiment of the invention according to claim (2) will be described based on FIG. 4. This device is substantially different from the conventional example only in the material of the detection cover.
従ってこれ以外の部材には、従来例と同一の符号を付し
て詳細な説明は省略する。Therefore, the same reference numerals as in the conventional example are given to the other members, and detailed explanation thereof will be omitted.
このものの検知カバー３４は、非磁性金属材料製ではな
く、熱伝導率が低い合成樹脂材料により形成されている
。すなわち位置検知用磁石１２と磁気感応素子１３から
なる検知部Ｒを合成樹脂製部材にて被っているのである
。□
第５図は、請求項（２）記載の発明の別の実施例で、実
質的には先の実施例に遮蔽板を追加した点のみが先の実
施例と異なる。従ってこれら以外の郵相には、先の実施
例と同一の符号を付して詳細な説明は省略する。The detection cover 34 of this device is not made of a non-magnetic metal material, but is made of a synthetic resin material with low thermal conductivity. That is, the detection part R consisting of the position detection magnet 12 and the magnetically sensitive element 13 is covered with a synthetic resin member. □ FIG. 5 shows another embodiment of the invention as claimed in claim (2), which differs from the previous embodiment only in that a shielding plate is substantially added to the previous embodiment. Therefore, postal addresses other than these will be given the same reference numerals as in the previous embodiment, and detailed explanation will be omitted.
このものの検知カバー４４は、兎の実施例の検知カバー
３４より若干軸方向長さが短い。４６は遮蔽板で、合成
樹脂材料により、検知カバー４４の外径と略同径の円板
状に形成される。４．６ ａは回転子軸２の挿通孔、４
．６ ｂは外周段部である。The detection cover 44 of this embodiment has a slightly shorter axial length than the detection cover 34 of the rabbit embodiment. Reference numeral 46 denotes a shielding plate, which is made of a synthetic resin material and has a disc shape having approximately the same diameter as the outer diameter of the detection cover 44 . 4.6 a is the insertion hole of the rotor shaft 2, 4
．． 6b is an outer peripheral stepped portion.
この遮蔽板４６は、軸受台１０の検知用磁石１２が位置
する側に取着され、その後検知カバー４４の開口端を外
周段部４．６ ｂに突き合わせてこれを遮蔽板４６に取
着する。従ってこのものは、先の実施例よりさらに確実
に、検知部Ｒを合成樹脂製部材にて被うこととなる。This shielding plate 46 is attached to the side of the bearing stand 10 on which the detection magnet 12 is located, and then the open end of the detection cover 44 is butted against the outer circumferential step portion 4.6b and this is attached to the shielding plate 46. . Therefore, in this case, the detection part R is covered with a synthetic resin member more reliably than in the previous embodiment.
［発明の効果］
本発明の無刷子電動機は、上記の如く構成したので、以
下のような効果を奏する。[Effects of the Invention] Since the brushless electric motor of the present invention is configured as described above, it has the following effects.
請求項（１）記載の無刷子電動機は、回転子軸や位置検
知用磁石が高温となって検知部カバー内が温度上昇して
も、検知部カバー内の高温の空気は対流遮蔽部材により
磁気感応素子に直接触れることがなくなって磁気感応素
子の温度上昇を抑制できる。In the brushless motor according to claim (1), even if the rotor shaft or position detection magnet becomes high temperature and the temperature inside the detection part cover rises, the high temperature air inside the detection part cover is magnetically prevented by the convection shielding member. Since there is no need to directly touch the sensing element, the temperature rise of the magnetic sensing element can be suppressed.
請求項（２）記載の無刷子電動機は、ハウジングと軸受
台にて形成されるスペース内の温度が上昇し、その結果
軸受台が高温になっても、検知部を被う合成樹脂製部材
により熱伝導が抑制できて磁気感応素子の温度上昇を抑
制できる。In the brushless electric motor according to claim (2), even if the temperature in the space formed by the housing and the bearing pedestal increases, and as a result the bearing pedestal becomes high temperature, the synthetic resin member covering the detection part Heat conduction can be suppressed, and the temperature rise of the magnetically sensitive element can be suppressed.
従って、いずれも磁気感応素子の温度上昇を抑制するこ
とにより磁気感応素子の感度の低下が抑制できるものと
なる。Therefore, in both cases, by suppressing the temperature rise of the magnetically sensitive element, a decrease in the sensitivity of the magnetically sensitive element can be suppressed.
第１図は、請求項（］）記載の発明の一実施例を示す縦
断面図、
第２図は、その別の実施例を示す縦断面図、第３図は、
その要部分解斜視図、
第４図は、請求項（２）記載の発明の一実施例を示す縦
断面図、
第５図は、その別の実施例を示す縦断面図、第６図は、
従来例の縦断面図である。
１−回転子、 ２一回転子軸、３−スリーブ、４−永
久磁石、
５−固定子、 ６−磁極子、 ７−絶縁部月、８−コイ
ル、
９−ハウジング、
１０−軸受台、
１２−位置検知用磁石、
１３−磁気感応素子、
１４゜
１５゜
３４．４４−・−検知カバー
２５一対流遮蔽部材、
遮蔽板、
検知部（１２＋１３）。FIG. 1 is a longitudinal sectional view showing one embodiment of the invention as claimed in claim ( ]), FIG. 2 is a longitudinal sectional view showing another embodiment thereof, and FIG.
FIG. 4 is a longitudinal sectional view showing one embodiment of the invention as claimed in claim (2); FIG. 5 is a longitudinal sectional view showing another embodiment thereof; FIG. 6 is a longitudinal sectional view showing another embodiment of the invention; ,
FIG. 3 is a vertical cross-sectional view of a conventional example. 1-Rotor, 2-Rotor shaft, 3-Sleeve, 4-Permanent magnet, 5-Stator, 6-Magnetic pole piece, 7-Insulation part, 8-Coil, 9-Housing, 10-Bearing stand, 12 - Position detection magnet, 13 - Magnetic sensing element, 14° 15° 34.44 - Detection cover 25 - Convection shielding member, shielding plate, detection part (12+13).
Claims (2)
周を円筒状に囲みかつ回転子の外周面に向けて複数の磁
極子を突出させ該磁極子の周囲に絶縁部材を介してコイ
ルを巻回した固定子と、有底円筒状をなして回転子の一
方と固定子とを保持するハウジングと、ハウジングの開
口部を閉塞して回転子の他方を保持する軸受台と、ハウ
ジングと軸受台にて形成されるスペースより軸受台を貫
通して突出した回転子軸に設けられた位置検知用磁石と
、位置検知用磁石に対面する磁気感応素子と、位置検知
用磁石と磁気感応素子とを被う検知部カバーとを含み、
磁気感応素子にて回転子の位置検知を行い、該位置検知
信号により作動する駆動回路がコイルへの通電を制御す
る無刷子電動機において、 前記位置検知用磁石と磁気感応素子との間に対流遮蔽部
材を介在させてなる無刷子電動機。(1) A rotor with permanent magnets arranged on its outer periphery, a plurality of magnetic pole pieces that surround the outer periphery of the rotor in a cylindrical shape, protrude toward the outer circumferential surface of the rotor, and surround the magnetic pole pieces with an insulating member interposed therebetween. a stator having a coil wound thereon, a housing having a bottomed cylindrical shape and holding one of the rotors and the stator, and a bearing stand holding the other rotor by closing an opening of the housing; A position detection magnet provided on the rotor shaft that protrudes through the bearing base from the space formed by the housing and the bearing base, a magnetically sensitive element facing the position detection magnet, and a position detection magnet and magnetic a sensing element cover that covers the sensing element;
In a brushless motor in which the position of the rotor is detected by a magnetically sensitive element, and a drive circuit activated by the position detection signal controls energization to the coil, a convection shield is provided between the position detecting magnet and the magnetically sensitive element. A brushless electric motor with intervening parts.
周を円筒状に囲みかつ回転子の外周面に向けて複数の磁
極子を突出させ該磁極子の周囲に絶縁部材を介してコイ
ルを巻回した固定子と、有底円筒状をなして回転子の一
方と固定子とを保持するハウジングと、ハウジングの開
口部を閉塞して回転子の他方を保持する軸受台と、ハウ
ジングと軸受台にて形成されるスペースより軸受台を貫
通して突出した回転子軸に設けられた位置検知用磁石と
、位置検知用磁石に対面する磁気感応素子と、位置検知
用磁石と磁気感応素子とを被う検知部カバーとを含み、
磁気感応素子にて回転子の位置検知を行い、該位置検知
信号により作動する駆動回路がコイルへの通電を制御す
る無刷子電動機において、 前記位置検知用磁石と磁気感応素子からなる検知部を合
成樹脂製部材にて被ってなる無刷子電動機。(2) A rotor with permanent magnets arranged on the outer periphery, a plurality of magnetic pole pieces that surround the outer periphery of the rotor in a cylindrical shape, protrude toward the outer circumferential surface of the rotor, and surround the magnetic pole pieces with an insulating member interposed therebetween. a stator having a coil wound thereon, a housing having a bottomed cylindrical shape and holding one of the rotors and the stator, and a bearing stand holding the other rotor by closing an opening of the housing; A position detection magnet provided on the rotor shaft that protrudes through the bearing base from the space formed by the housing and the bearing base, a magnetically sensitive element facing the position detection magnet, and a position detection magnet and magnetic a sensing element cover that covers the sensing element;
In a brushless electric motor in which the position of the rotor is detected by a magnetically sensitive element, and a drive circuit activated by the position detection signal controls energization to the coil, a detection section consisting of the position detecting magnet and the magnetically sensitive element is combined. A brushless electric motor covered with resin parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1717989A JPH02197246A (en) | 1989-01-26 | 1989-01-26 | Brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1717989A JPH02197246A (en) | 1989-01-26 | 1989-01-26 | Brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02197246A true JPH02197246A (en) | 1990-08-03 |
Family
ID=11936722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1717989A Pending JPH02197246A (en) | 1989-01-26 | 1989-01-26 | Brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02197246A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2391480B1 (en) | 2009-01-30 | 2015-11-11 | Hitachi Koki CO., LTD. | Power tool |
| EP3109984A4 (en) * | 2014-08-01 | 2017-07-19 | Panasonic Intellectual Property Management Co., Ltd. | Motor |
| US10236742B2 (en) | 2014-11-25 | 2019-03-19 | Black & Decker Inc. | Brushless motor for a power tool |
| US10328566B2 (en) | 2015-10-14 | 2019-06-25 | Black & Decker Inc. | Brushless motor system for power tools |
-
1989
- 1989-01-26 JP JP1717989A patent/JPH02197246A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2391480B1 (en) | 2009-01-30 | 2015-11-11 | Hitachi Koki CO., LTD. | Power tool |
| EP3109984A4 (en) * | 2014-08-01 | 2017-07-19 | Panasonic Intellectual Property Management Co., Ltd. | Motor |
| US10236742B2 (en) | 2014-11-25 | 2019-03-19 | Black & Decker Inc. | Brushless motor for a power tool |
| US10523081B2 (en) | 2014-11-25 | 2019-12-31 | Black & Decker Inc. | Brushless motor for a power tool |
| US10328566B2 (en) | 2015-10-14 | 2019-06-25 | Black & Decker Inc. | Brushless motor system for power tools |
| US10328567B2 (en) | 2015-10-14 | 2019-06-25 | Black & Decker Inc. | Brushless motor system for power tools |
| US10500708B2 (en) | 2015-10-14 | 2019-12-10 | Black & Decker Inc. | Power tool |
| US10786894B2 (en) | 2015-10-14 | 2020-09-29 | Black & Decker Inc. | Brushless motor system for power tools |
| US11951603B2 (en) | 2015-10-14 | 2024-04-09 | Black & Decker Inc. | Brushless motor system for power tools |
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