JP2001119876A - Brushless electric motor - Google Patents
Brushless electric motorInfo
- Publication number
- JP2001119876A JP2001119876A JP29506499A JP29506499A JP2001119876A JP 2001119876 A JP2001119876 A JP 2001119876A JP 29506499 A JP29506499 A JP 29506499A JP 29506499 A JP29506499 A JP 29506499A JP 2001119876 A JP2001119876 A JP 2001119876A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- pole portion
- sensor
- magnet
- brushless motor
- 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.)
- Granted
Links
Landscapes
- Brushless Motors (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主にルームエアコ
ンや給湯機や換気扇などの送風ファン駆動源として用い
られる小型電動機の一種である無刷子電動機に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor which is one of small motors mainly used as a drive source for a blower fan such as a room air conditioner, a water heater and a ventilation fan.
【０００２】[0002]
【従来の技術】近年、この種の無刷子電動機は、小型
化、低コスト化、部品点数・加工工数の削減、設備・金
型投資の抑制を実現した上で高品質、高出力および高効
率化が強く要求されている。無刷子電動機の高出力およ
び高効率化は、固定子は磁気飽和限界までスロット面積
を拡げるとともに、高密度実装巻線により実現し、ま
た、回転子は磁束密度の高い磁石を使用することにより
対処されている。さらに、最近では多極化することによ
って高効率化を実現している。2. Description of the Related Art In recent years, brushless motors of this type have achieved high quality, high output, and high efficiency after realizing miniaturization, cost reduction, reduction in the number of parts and processing steps, and reduction in equipment and mold investment. Is strongly required. The high output and high efficiency of brushless motors are achieved by increasing the slot area of the stator to the magnetic saturation limit, realizing high-density mounting windings, and using a magnet with a high magnetic flux density for the rotor. Have been. Furthermore, recently, high efficiency has been realized by increasing the number of electrodes.
【０００３】磁石は形状面からはリング型磁石とセグメ
ント型磁石に区分され、セグメント型磁石の方が磁束密
度は高い。また、磁性粉体を金型内で成型するときに磁
場をかけて配向するか、磁場をかけないで配向しないか
によって、異方性磁石、等方性磁石に区分され、磁場を
かけて得られる異方性磁石には、磁場配向によってラジ
アル異方性磁石と極異方性磁石と軸方向異方性に区分さ
れ、極異方性磁石はラジアル異方性磁石よりも２０％程
度磁束密度が高く、着磁波形は正弦波となるので、低振
動化、高出力および高効率化には極異方性磁石が用いら
れるようになってきた。[0003] Magnets are classified into ring type magnets and segment type magnets in terms of shape, and the segment type magnet has a higher magnetic flux density. The magnetic powder is divided into anisotropic magnets and isotropic magnets depending on whether it is oriented by applying a magnetic field when it is molded in a mold or is not oriented without applying a magnetic field. Anisotropic magnets are classified into radial anisotropic magnets, polar anisotropic magnets, and axially anisotropic magnets according to the magnetic field orientation. Polar anisotropic magnets have a magnetic flux density of about 20% higher than radial anisotropic magnets. And the magnetization waveform is a sine wave, so that polar anisotropic magnets have come to be used for low vibration, high output and high efficiency.
【０００４】従来、この種の無刷子電動機の一例として
図１２および図１３に示されるものが知られていた。以
下、その構成について図１２および図１３を参照しなが
ら説明する。[0004] Conventionally, as an example of this type of brushless motor, those shown in FIGS. 12 and 13 have been known. Hereinafter, the configuration will be described with reference to FIGS.
【０００５】図に示すように、固定子５４は、６つのス
ロットを有する固定子鉄心５１を一体成形あるいは軸方
向からの挟み込みによりインシュレータ５２にて絶縁
し、電機子巻線５３を直接巻装して構成され、磁石回転
子５５は、シャフト５６を圧入した回転子鉄心５７に４
枚のフェライト異方性セグメント磁石５８を貼り付け、
フェライト異方性セグメント磁石５８の軸方向長さは固
定子鉄心５１の軸方向長さ以上に構成され、５９は磁石
回転子５５の磁極位置を検出するための位置検出素子で
あるホールＩＣ６０および電機子巻線５３への通電を制
御する駆動ＩＣ６１を搭載したプリント基板であり、ホ
ールＩＣ６０はフェライト異方性セグメント磁石５８の
漏れ磁束を検出する構成であった。しかし、このような
６スロット４極の無刷子電動機では、極端な高効率化は
できないため、固定子鉄心５１のスロット数を６スロッ
トから９スロットあるいは１２スロットにし、磁石回転
子５５の極数を４極から８極にすることによって、高効
率化する構成が提案されてきている。しかしながら、磁
石回転子５５の極数を４極から８極に増やすことによっ
て、磁石回転子５５の加工工数は２倍になってしまうた
め、コスト高となるので、リング型磁石である極異方性
磁石の採用が増えてきている。[0005] As shown in the figure, a stator 54 has a stator core 51 having six slots, which is integrally molded or insulated by an insulator 52 by being sandwiched in the axial direction, and an armature winding 53 is directly wound thereon. The magnet rotor 55 is connected to a rotor core 57 into which a shaft 56 is press-fitted.
Paste the two ferrite anisotropic segment magnets 58,
The axial length of the ferrite anisotropic segment magnet 58 is equal to or greater than the axial length of the stator core 51, and 59 is a Hall IC 60 and a motor which are position detecting elements for detecting the magnetic pole position of the magnet rotor 55. The Hall IC 60 is configured to detect a leakage magnetic flux of the ferrite anisotropic segment magnet 58 on which a drive IC 61 for controlling the energization of the slave winding 53 is mounted. However, with such a 6-slot 4-pole brushless motor, extremely high efficiency cannot be achieved. Therefore, the number of slots of the stator core 51 is changed from 6 to 9 or 12 and the number of poles of the magnet rotor 55 is reduced. A configuration for increasing the efficiency by changing the number of poles from four to eight has been proposed. However, by increasing the number of poles of the magnet rotor 55 from 4 poles to 8 poles, the number of processing steps of the magnet rotor 55 is doubled and the cost is increased. The use of sex magnets is increasing.
【０００６】[0006]
【発明が解決しようとする課題】このような従来の無刷
子電動機によれば、プリント基板５９を電動機内部に内
蔵し、ホールＩＣ６０を用いて磁石回転子５５の磁極位
置を検出する場合、磁石５８の軸方向長さの少なくとも
プリント基板５９側は固定子鉄心５１に巻装された電機
子巻線５３の軸方向長さ以上とする必要がある。しかし
ながら、この方法では固定子鉄心５１の軸方向中心と磁
石５８の軸方向中心がずれるので、磁気中心がずれ、固
定子鉄心５１と磁石５８との磁力において軸方向にアン
バランスを生じて、軸方向の振動が大きくなるという課
題があった。According to such a conventional brushless motor, when the printed circuit board 59 is built in the motor and the magnetic pole position of the magnet rotor 55 is detected by using the Hall IC 60, the magnet 58 is not used. Of the armature winding 53 wound around the stator core 51 needs to be longer than the axial length of the armature winding 53 at least on the printed board 59 side. However, in this method, since the axial center of the stator core 51 and the axial center of the magnet 58 are shifted, the magnetic center is shifted, and the magnetic force between the stator core 51 and the magnet 58 is unbalanced in the axial direction. There was a problem that the vibration in the direction increased.
【０００７】また、磁石５８の軸方向長さをプリント基
板５９の反対側へも同様に長くすれば、磁石５８と固定
子鉄心５１の磁気中心のずれは無くなるが、無刷子電動
機の軸方向長さが長くなりすぎ、薄型化できないという
課題があった。If the length of the magnet 58 in the axial direction is similarly increased toward the opposite side of the printed circuit board 59, the magnetic center between the magnet 58 and the stator core 51 is not shifted, but the axial length of the brushless motor is reduced. However, there has been a problem that the thickness is too long and the thickness cannot be reduced.
【０００８】また、磁石５８の軸方向長さが固定子鉄心
５１に軸方向長さよりも異常に長くなった場合、固定子
鉄心５１が磁気飽和を生じるので、誘起電圧位相がセン
サ信号よりも進むとともに、誘起電圧波形のピークが凹
状に歪むため、通電位相が遅れ、消費電力が異常に上昇
し、出力が低下し、トルクリップルおよびトルク変化率
が大きくなり、回転方向の振動が大きくなるという課題
があった。When the axial length of the magnet 58 is abnormally longer than the axial length of the stator core 51, the stator core 51 is magnetically saturated, so that the induced voltage phase is ahead of the sensor signal. At the same time, since the peak of the induced voltage waveform is distorted in a concave shape, the conduction phase is delayed, the power consumption increases abnormally, the output decreases, the torque ripple and the torque change rate increase, and the vibration in the rotational direction increases. was there.
【０００９】また、環状の回転子鉄心の外周部にリング
状の第１永久磁石を接着固定し、回転子鉄心の端面にセ
ンサ用の第２永久磁石を接着固定した無刷子電動機（特
開平１０−３２２９９９号公報参照）の構成が開示され
ているが、その目的は電気絶縁体が干渉しない自由な位
置に磁気センサーを配置することであり、この構成の無
刷子電動機では、回転子鉄心への永久磁石の接着固定を
２回行う必要があり、品質の安定した接着固定を行うに
は、高温炉を使用して約１時間程度を要するため、加工
工数の増大および設備投資が増大するという課題があっ
た。そして、特に第２永久磁石の接着固定の位置につい
ては、少量の位置ずれでも重量アンバランスを生じた
り、センサ信号の変化間隔が均等にならないという課題
があった。さらに、第２永久磁石を接着する接着面は平
坦面であるとともに、磁極面に対する垂直度の精度を高
くしなければならないという課題があった。A brushless motor in which a ring-shaped first permanent magnet is bonded and fixed to an outer periphery of an annular rotor core and a second permanent magnet for a sensor is bonded and fixed to an end face of the rotor core (Japanese Patent Laid-Open No. The purpose of the invention is to dispose a magnetic sensor at a free position where the electric insulator does not interfere. The permanent magnet needs to be bonded and fixed twice, and it takes about 1 hour using a high-temperature furnace to perform stable bonding with stable quality. This increases the number of processing steps and increases capital investment. was there. In particular, with respect to the position where the second permanent magnet is bonded and fixed, there is a problem that even a small amount of misalignment may cause weight imbalance or change intervals of sensor signals may not be uniform. Further, there is a problem that the bonding surface for bonding the second permanent magnet is a flat surface and the accuracy of perpendicularity to the magnetic pole surface must be increased.
【００１０】また、特開平１０−３２２９９９号公報に
は開示されていないが、第１永久磁石に焼結極異方性磁
石を使用する場合、回転子鉄心は不要であるが、回転子
鉄心に接着する場合、焼結極異方性磁石の内径研磨が必
須となる。しかし、焼結極異方性磁石の内径研磨は加工
が困難であるため、コストが異常に高くなるという課題
があった。Although not disclosed in Japanese Patent Application Laid-Open No. Hei 10-322999, when a sintered pole anisotropic magnet is used as the first permanent magnet, a rotor core is unnecessary, but the rotor core is not required. In the case of bonding, polishing of the inner diameter of the sintered polar anisotropic magnet is essential. However, since the inner diameter polishing of the sintered pole anisotropic magnet is difficult to process, there has been a problem that the cost is abnormally high.
【００１１】本発明は、このような従来の課題を解決す
るものであり、振動が大きくなるなどの特性劣化を生じ
ることなく、コストおよび加工工数を低減でき、また、
電子部品を実装したプリント基板を内蔵しても、薄型化
・小型化・軽量化・低消費電力化・高品質化できる無刷
子電動機を提供することを目的とする。The present invention solves such a conventional problem, and can reduce the cost and the number of processing steps without deteriorating characteristics such as an increase in vibration.
It is an object of the present invention to provide a brushless motor that can be reduced in thickness, size, weight, power consumption, and quality even when a printed circuit board on which electronic components are mounted is incorporated.
【００１２】[0012]
【課題を解決するための手段】本発明の無刷子電動機は
上記目的を達成するために、焼結極異方性磁石よりなる
環状の主磁極部と、この主磁極部の外径よりも小さい外
径で環状の樹脂磁石またはゴム磁石よりなるセンサ用磁
極部から構成され、主磁極部とセンサ用磁極部は軸方向
に並んで位置した磁石回転子の構成としたものである。In order to achieve the above object, a brushless motor according to the present invention has an annular main magnetic pole portion made of a sintered pole anisotropic magnet and an outer diameter smaller than the outer diameter of the main magnetic pole portion. The sensor magnetic pole portion is formed of an annular resin magnet or rubber magnet having an outer diameter, and the main magnetic pole portion and the sensor magnetic pole portion are configured as magnet rotors arranged in the axial direction.
【００１３】本発明によれば、固定子鉄心の磁気中心と
主磁極部の磁気中心を合わすことができ、また、振動が
大きくなるなどの特性劣化を生じることなく、主磁極部
の磁石ボリュームを削減できるので、低コスト化、小型
化した無刷子電動機が得られる。According to the present invention, the magnetic center of the stator core and the magnetic center of the main magnetic pole portion can be aligned, and the magnet volume of the main magnetic pole portion can be reduced without deterioration in characteristics such as increased vibration. Since it can be reduced, a brushless motor with reduced cost and size can be obtained.
【００１４】また他の手段は、センサ用磁極部を形成す
るゴム磁石はシート状の磁石を略環状に打ち抜いて構成
したものである。Another means is that the rubber magnet forming the magnetic pole portion for the sensor is formed by punching a sheet-like magnet into a substantially annular shape.
【００１５】本発明によれば、センサ用磁極部を製作す
るのに必要な金型の投資費用を大幅に削減できるので、
より低コスト化した無刷子電動機が得られる。According to the present invention, the investment cost of the mold required to manufacture the magnetic pole portion for the sensor can be greatly reduced.
A brushless motor with lower cost can be obtained.
【００１６】また他の手段は、センサ用磁極部を構成す
る磁石の磁性粉体微粒子の磁化容易軸は軸方向に異方化
した構成としたものである。Another means is that the easy axis of magnetization of the magnetic powder particles of the magnet constituting the sensor magnetic pole portion is anisotropic in the axial direction.
【００１７】本発明によれば、センサ用磁極部の軸方向
長さを短くできるので、磁石ボリュームを削減でき、低
コスト化、小型化した無刷子電動機が得られる。According to the present invention, since the axial length of the magnetic pole portion for the sensor can be shortened, the volume of the magnet can be reduced, and a cost-effective and compact brushless motor can be obtained.
【００１８】また他の手段は、センサ用磁極部を構成す
る磁石に複数の貫通穴を設けた構成としたものである。In another aspect, a plurality of through holes are provided in a magnet constituting a magnetic pole portion for a sensor.
【００１９】本発明によれば、主磁極部に対するセンサ
用磁極部の正確な位置合わせが容易にできるので、磁石
回転子を製造する加工工数が低減できるとともに、重量
アンバランスやセンサ信号の不均一を抑制でき、低コス
ト化，高品質化，高性能化した無刷子電動機が得られ
る。According to the present invention, accurate positioning of the sensor magnetic pole portion with respect to the main magnetic pole portion can be easily performed, so that the number of processing steps for manufacturing the magnet rotor can be reduced, and weight imbalance and unevenness of the sensor signal can be achieved. And a brushless motor with reduced cost, higher quality, and higher performance can be obtained.
【００２０】また他の手段は、センサ用磁極部を構成す
る磁石に設けられた複数の貫通穴は段付き貫通穴の構成
としたものである。Another means is that the plurality of through holes provided in the magnet constituting the sensor magnetic pole portion are configured as stepped through holes.
【００２１】本発明によれば、主磁極部に対するセンサ
用磁極部の正確な位置合わせが一層容易にできるので、
磁石回転子を製造する加工工数がより低減できるととも
に、重量アンバランスやセンサ信号の不均一を抑制で
き、低コスト化，高品質化，高性能化した無刷子電動機
が得られる。According to the present invention, accurate positioning of the sensor magnetic pole portion with respect to the main magnetic pole portion can be more easily performed.
The number of processing steps for manufacturing the magnet rotor can be further reduced, and weight imbalance and sensor signal non-uniformity can be suppressed, and a brushless motor with reduced cost, higher quality, and higher performance can be obtained.
【００２２】また他の手段は、センサ用磁極部を構成す
る磁石に設けられた複数の貫通穴はすり鉢状貫通穴の構
成としたものである。Another means is that the plurality of through holes provided in the magnet constituting the magnetic pole portion for the sensor are formed as mortar-shaped through holes.
【００２３】本発明によれば、主磁極部に対するセンサ
用磁極部の正確な位置合わせが一層容易にできるので、
磁石回転子を製造する加工工数がより低減できるととも
に、重量アンバランスやセンサ信号の不均一を抑制で
き、低コスト化，高品質化，高性能化した無刷子電動機
が得られる。According to the present invention, accurate alignment of the sensor magnetic pole portion with respect to the main magnetic pole portion can be further facilitated.
The number of processing steps for manufacturing the magnet rotor can be further reduced, and weight imbalance and sensor signal non-uniformity can be suppressed, and a brushless motor with reduced cost, higher quality, and higher performance can be obtained.
【００２４】また他の手段は、主磁極部は保持部を介し
てシャフトに固定され、保持部はセンサ用磁極部を固定
する突部を有し、この突部にセンサ用磁極部の貫通穴を
嵌合し、前記突部の先端部を潰して前記センサ用磁極部
を固定した磁石回転子の構成としたものである。Another means is that the main magnetic pole portion is fixed to the shaft via a holding portion, and the holding portion has a projection for fixing the sensor magnetic pole portion, and the projection has a through hole for the sensor magnetic pole portion. Are fitted, and the tip of the protrusion is crushed to fix the sensor magnetic pole portion to form a magnet rotor.
【００２５】本発明によれば、保持部を形成する材料ボ
リュームを削減でき、高温炉などを使用する接着が不要
となり、磁石回転子を製造する加工工数，加工費および
投資費用が低減でき、重量アンバランスやセンサ信号の
不均一を抑制できるので、低コスト化，高品質化，高性
能化した無刷子電動機が得られる。According to the present invention, the volume of the material forming the holding portion can be reduced, the bonding using a high-temperature furnace or the like becomes unnecessary, and the number of processing steps, processing cost and investment cost for manufacturing the magnet rotor can be reduced, and the weight can be reduced. Since unbalance and non-uniformity of sensor signals can be suppressed, a brushless motor with low cost, high quality, and high performance can be obtained.
【００２６】また他の手段は、主磁極部は保持部を介し
てシャフトに固定され、前記保持部はセンサ用磁極部を
固定する突部を有し、前記センサ用磁極部の段付き貫通
穴またはすり鉢状貫通穴の小径側を主磁極部側に位置さ
せて前記突部に嵌合し、前記突部の先端部を前記段付き
貫通穴またはすり鉢状貫通穴の大径部空間内に潰して前
記センサ用磁極部を固定した磁石回転子の構成としたも
のである。Another means is that the main magnetic pole portion is fixed to the shaft via a holding portion, the holding portion has a projection for fixing the sensor magnetic pole portion, and a stepped through hole of the sensor magnetic pole portion. Alternatively, the small-diameter side of the mortar-shaped through-hole is positioned on the main magnetic pole part side and fitted to the projection, and the tip of the projection is crushed in the large-diameter space of the stepped through-hole or the mortar-shaped through-hole. Thus, the magnetic pole portion for the sensor is fixed to form a magnet rotor.
【００２７】本発明によれば、保持部を形成する材料ボ
リュームを削減でき、高温炉などを使用する接着が不要
となり、磁石回転子を製造する加工工数，加工費および
投資費用が低減でき、重量アンバランスやセンサ信号の
不均一を抑制でき、軸方向長さをより一層短くできるの
で、低コスト化，高品質化，高性能化，一層の小型化を
実現した無刷子電動機が得られる。According to the present invention, the volume of the material forming the holding portion can be reduced, the bonding using a high-temperature furnace or the like becomes unnecessary, and the number of processing steps, processing cost and investment cost for manufacturing the magnet rotor can be reduced, and the weight can be reduced. Since unbalance and nonuniformity of sensor signals can be suppressed and the axial length can be further reduced, a brushless motor can be obtained which is low in cost, high in quality, high in performance, and further downsized.
【００２８】また他の手段は、保持部の突部のうち少な
くとも先端部を薄肉とした磁石回転子の構成としたもの
である。Another means is a magnet rotor in which at least the tip of the projection of the holding portion is thin.
【００２９】本発明によれば、保持部を形成する材料ボ
リュームを削減でき、高温炉などを使用する接着が不要
となり、センサ用磁極部の固定に要する加工時間が大幅
に短縮できるため、磁石回転子を製造する加工工数，加
工費および投資費用が低減でき、重量アンバランスやセ
ンサ信号の不均一を抑制できるので、一層の低コスト
化，高品質化，高性能化，小型化した無刷子電動機が得
られる。According to the present invention, the volume of the material forming the holding portion can be reduced, the bonding using a high-temperature furnace or the like is not required, and the processing time required for fixing the magnetic pole portion for the sensor can be greatly reduced. Since the number of processing steps, processing cost and investment cost for manufacturing the armature can be reduced and weight imbalance and sensor signal non-uniformity can be suppressed, further cost reduction, high quality, high performance and miniaturized brushless motor have been achieved. Is obtained.
【００３０】また他の手段は、センサ用磁極部の貫通穴
に樹脂を充填して主磁極部とセンサ用磁極部とシャフト
とを一体成形して磁石回転子を構成したものである。Another means is to form a magnet rotor by filling the through-hole of the sensor magnetic pole portion with resin and integrally molding the main magnetic pole portion, the sensor magnetic pole portion and the shaft.
【００３１】本発明によれば、磁石回転子の加工費およ
び投資費用が低減でき、センサ用磁極部の空回り，重量
アンバランスやセンサ信号の不均一を確実に抑制でき、
低コスト化，高品質化，高性能化した無刷子電動機が得
られる。According to the present invention, the processing cost and investment cost of the magnet rotor can be reduced, and idling of the sensor magnetic pole portion, weight imbalance, and nonuniformity of the sensor signal can be reliably suppressed.
A brushless motor with low cost, high quality, and high performance can be obtained.
【００３２】[0032]
【発明の実施の形態】本発明は、主磁極部を焼結極異方
性磁石で形成し、センサ用磁極部を主磁極部の外径より
も小さい樹脂磁石またはゴム磁石で形成した磁石回転子
の構成としたものであり、適正な鎖交磁束を確保した上
で主磁極部を形成する磁石の軸方向長さを短くするなど
磁石ボリュームを減少でき、固定子鉄心の磁気中心と回
転トルクを発生する主磁極部の磁気中心とが一致し、磁
気飽和が抑制され、鎖交磁束が正弦波になるという作用
を有する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a rotating magnet in which a main magnetic pole portion is formed of a sintered pole anisotropic magnet and a magnetic pole portion for a sensor is formed of a resin magnet or a rubber magnet smaller than the outer diameter of the main magnetic pole portion. The magnet volume can be reduced, for example, by shortening the axial length of the magnet that forms the main magnetic pole part after securing the appropriate linkage flux, and the magnetic torque of the stator core and the rotational torque can be reduced. The magnetic center of the main magnetic pole portion that generates the magnetic field coincides with each other, magnetic saturation is suppressed, and the linkage flux has a sine wave.
【００３３】また、センサ用磁極部を形成するゴム磁石
はシート状の磁石を略環状に打ち抜いて形成した磁石回
転子の構成としたものであり、センサ用磁極部を製造す
る金型の構造が非常に簡単で安価な構造になるという作
用を有する。The rubber magnet forming the magnetic pole portion for the sensor has a configuration of a magnet rotor formed by punching a sheet-like magnet into a substantially annular shape. It has the effect of having a very simple and inexpensive structure.
【００３４】また、センサ用磁極部を構成する磁石の磁
性粉体微粒子の磁化容易軸は軸方向に異方化した磁石回
転子の構成としたものであり、センサ用磁極部の軸方向
長さを短くできるという作用を有する。Further, the axis of easy magnetization of the magnetic powder particles of the magnet constituting the magnetic pole portion for the sensor is constituted by a magnet rotor which is anisotropic in the axial direction. Can be shortened.
【００３５】また、センサ用磁極部を形成する磁石は複
数の貫通穴を設けた磁石回転子の構成としたものであ
り、主磁極部に対するセンサ用磁極部の正確な位置合わ
せが容易になるという作用を有する。Further, the magnet forming the magnetic pole portion for the sensor has a configuration of a magnet rotor having a plurality of through holes, which facilitates accurate alignment of the magnetic pole portion for the sensor with respect to the main magnetic pole portion. Has an action.
【００３６】また、センサ用磁極部を構成する磁石に設
けられた複数の貫通穴は段付き貫通穴とした磁石回転子
の構成としたものであり、主磁極部に対するセンサ用磁
極部の正確な位置合わせが一層容易になるという作用を
有する。The plurality of through holes provided in the magnet constituting the magnetic pole portion for the sensor have a configuration of a magnet rotor having a stepped through hole, and the accuracy of the magnetic pole portion for the sensor with respect to the main magnetic pole portion is accurate. This has the effect that the alignment becomes easier.
【００３７】また、センサ用磁極部を構成する磁石に設
けられた複数の貫通穴はすり鉢状貫通穴とした磁石回転
子の構成としたものであり、主磁極部に対するセンサ用
磁極部の正確な位置合わせが一層容易になるという作用
を有する。The plurality of through holes provided in the magnet constituting the magnetic pole portion for the sensor are configured as a magnet rotor having a mortar-shaped through-hole, so that the accurate positioning of the magnetic pole portion for the sensor with respect to the main magnetic pole portion. This has the effect that the alignment becomes easier.
【００３８】また、主磁極部は保持部を介してシャフト
に固定され、保持部はセンサ用磁極部を固定する突部を
有し、この突部にセンサ用磁極部の貫通穴を嵌合し、前
記突部の先端部を潰してセンサ用磁極部を固定した磁石
回転子の構成としたものであり、保持部の材料ボリュー
ムが削減し、高温炉などを使用する接着が不要になると
いう作用を有する。Further, the main magnetic pole portion is fixed to the shaft via a holding portion, and the holding portion has a projection for fixing the sensor magnetic pole portion, and a through hole of the sensor magnetic pole portion is fitted into this projection. And a magnet rotor in which the tip of the protrusion is crushed to fix the magnetic pole portion for the sensor, which reduces the material volume of the holding portion and eliminates the need for bonding using a high-temperature furnace or the like. Having.
【００３９】また、主磁極部は保持部を介してシャフト
に固定され、保持部はセンサ用磁極部を固定する突部を
有し、センサ用磁極部の段付き貫通穴またはすり鉢状貫
通穴の小径側を主磁極部側に位置させて前記突部に嵌合
し、突部の先端部を段付き貫通穴またはすり鉢状貫通穴
の大径部空間内に潰してセンサ用磁極部を固定した磁石
回転子の構成としたものであり、保持部の材料ボリュー
ムが削減し、高温炉などを使用する接着が不要になり、
磁石回転子の軸方向長さが短くなるという作用を有す
る。Further, the main magnetic pole portion is fixed to the shaft via the holding portion, and the holding portion has a projection for fixing the sensor magnetic pole portion, and has a stepped through hole or a mortar-shaped through hole of the sensor magnetic pole portion. The small-diameter side was positioned on the main magnetic pole part side and fitted to the projection, and the tip of the projection was crushed into the large-diameter part space of a stepped through hole or a mortar-shaped through hole to fix the sensor magnetic pole part. It has a magnet rotor configuration, reducing the material volume of the holding part, eliminating the need for bonding using a high-temperature furnace, etc.
This has the effect that the axial length of the magnet rotor is reduced.
【００４０】また、保持部の突部のうち少なくとも先端
部は薄肉とした磁石回転子の構成としたものであり、保
持部の材料ボリュームが削減し、高温炉などを使用する
接着が不要になり、センサ用磁極部の保持部への固定に
要する時間が短くなるという作用を有する。Further, at least the leading end of the projection of the holding portion is formed as a thin magnet rotor, so that the material volume of the holding portion is reduced, and the bonding using a high-temperature furnace or the like becomes unnecessary. This has the effect of shortening the time required for fixing the sensor magnetic pole portion to the holding portion.
【００４１】また、センサ用磁極部の貫通穴に樹脂を充
填して主磁極部とセンサ用磁極部とシャフトとを一体成
形して磁石回転子を構成したものであり、センサ用磁極
部の固定が堅固になるという作用を有する。The through hole of the sensor magnetic pole portion is filled with resin, and the main magnetic pole portion, the sensor magnetic pole portion and the shaft are integrally formed to form a magnet rotor, and the sensor magnetic pole portion is fixed. Has the effect of becoming firmer.
【００４２】以下、本発明の実施例について図１〜図１
１を参照しながら説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
1 will be described.
【００４３】[0043]
【実施例】（実施例１）図１および図２に示すように、
１は複数のスロットを有する固定子鉄心４に絶縁材にて
形成されたインシュレータ２を介して電機子巻線３を巻
装した固定子で、固定子１は熱硬化性樹脂１６にてモー
ルド成形されて外被を形成しており、１７はブラケット
で軸受け１４を保持している。１０はホールＩＣ１１、
駆動ＩＣ１２および電子部品１３などを実装したプリン
ト基板で、８は磁石回転子であり、焼結フェライト極異
方性磁石よりなる主磁極部６と、等方性の樹脂磁石より
なる環状のセンサ用磁極部７をシャフト９の軸方向に隙
間５ａを設けて並べ、熱可塑性樹脂５にて一体成形され
て形成され、主磁極部６とセンサ用磁極部７の隙間５ａ
にも熱可塑性樹脂５が介在している。また、センサ用磁
極部７の外径から外側および主磁極部６の外径より内側
の範囲に空間部１５を設け、プリント基板１０に駆動Ｉ
Ｃ１２などを実装するその配置は、ホールＩＣ１１はセ
ンサ用磁極部７に対向した位置に、駆動ＩＣ１２につい
てはプリント基板１０に電気的に接続する接続脚１２ａ
の長さ（プリント基板１０の端面からの高さ）が２ｍｍ
以上のため、接続脚１２ａのプリント基板１０への半田
部１２ｂが空間部１５に位置するよう配置され、同様に
電子部品１３の中で高さが２ｍｍ以上あるツェナーダイ
オード、コンデンサなどの電子部品１３ａについても空
間部１５に位置するよう配置されている。(Embodiment 1) As shown in FIGS. 1 and 2,
Reference numeral 1 denotes a stator in which an armature winding 3 is wound around a stator core 4 having a plurality of slots via an insulator 2 formed of an insulating material. The stator 1 is molded from a thermosetting resin 16. In this manner, a bracket 17 holds the bearing 14 with a bracket. 10 is a Hall IC 11,
A printed circuit board on which the drive IC 12 and the electronic components 13 are mounted. Reference numeral 8 denotes a magnet rotor for a main magnetic pole 6 made of a sintered ferrite anisotropic magnet and an annular sensor made of an isotropic resin magnet. The magnetic pole portions 7 are arranged with a gap 5 a provided in the axial direction of the shaft 9, formed integrally with the thermoplastic resin 5, and formed with a gap 5 a between the main magnetic pole portion 6 and the sensor magnetic pole portion 7.
The thermoplastic resin 5 is also interposed. Further, a space 15 is provided in a range outside the outer diameter of the sensor magnetic pole portion 7 and inside the outer diameter of the main magnetic pole portion 6, and drives the printed circuit board 10.
The arrangement for mounting C12 and the like is such that the Hall IC 11 is located at a position facing the sensor magnetic pole portion 7, and the drive IC 12 is a connection leg 12a for electrically connecting to the printed circuit board 10.
Length (height from the end face of the printed circuit board 10) is 2 mm
For this reason, the soldering portion 12b of the connection leg 12a to the printed circuit board 10 is arranged so as to be located in the space portion 15, and similarly, the electronic component 13a such as a Zener diode or a capacitor having a height of 2 mm or more in the electronic component 13. Are also arranged so as to be located in the space 15.
【００４４】このような本発明の無刷子電動機によれ
ば、主磁極部６を焼結フェライト極異方性磁石で形成
し、センサ用磁極部７を主磁極部６の外径よりも小さい
等方性樹脂磁石で形成し、主磁極部６とセンサ用磁極部
７は軸方向に並んで位置した磁石回転子８の構成とする
ことによって、適正な鎖交磁束を確保した上で主磁極部
６の軸方向長さを短くするなど磁石ボリュームを減少で
き、固定子鉄心４の磁気中心と回転トルクを発生する主
磁極部６の磁気中心とが一致するので、軸方向の振動の
発生が抑制できる。また、磁気飽和が抑制され、鎖交磁
束が正弦波になるため、常に誘起電圧位相に対して最適
な通電位相で運転できるので、トルクリップル・トルク
変化率の増大が抑制され、回転方向の振動の増大が抑制
される。また、磁石ボリュームを減らすことができるた
め、コスト低減・小型化・軽量化ができる。したがっ
て、低コスト・低振動・小型化・軽量化の無刷子電動機
が得られる。According to such a brushless motor of the present invention, the main magnetic pole 6 is formed of a sintered ferrite anisotropic magnet, and the magnetic pole 7 for the sensor is smaller than the outer diameter of the main magnetic pole 6. The main magnetic pole portion 6 and the sensor magnetic pole portion 7 are formed of an isotropic resin magnet, and the magnet rotor 8 is arranged in the axial direction. The magnetic volume of the stator core 4 can be reduced by shortening the axial length of the stator core 6, and the magnetic center of the stator core 4 matches the magnetic center of the main magnetic pole portion 6 that generates rotational torque, thereby suppressing the occurrence of axial vibration. it can. In addition, since magnetic saturation is suppressed and the interlinkage magnetic flux becomes a sine wave, operation can always be performed at the optimum energizing phase with respect to the induced voltage phase. Is suppressed. Further, since the magnet volume can be reduced, the cost, size, and weight can be reduced. Therefore, a brushless motor with low cost, low vibration, small size, and light weight can be obtained.
【００４５】また、焼結フェライト極異方性磁石よりな
る主磁極部６と等方性樹脂磁石よりなるセンサ用磁極部
７とシャフト９がＰＢＴなどの熱可塑性樹脂５で一体的
に成形固化して磁石回転子８を構成することによって、
焼結フェライト極異方性磁石および等方性樹脂磁石の内
径研磨および積層された回転子鉄心と、回転子鉄心への
シャフト９の圧入が不要となるため、磁石が安価に安定
生産ができるとともに、部品点数の削減ができ、磁石回
転子８が完成するまでの加工時間の削減ができる。さら
に、樹脂成形金型にて全ての部品を外形基準にて位置決
めして製造するので、重量アンバランスやセンサ信号の
不均一を抑制できる。したがって、より安価で、低振動
化・小型化・軽量化・低消費電力化・高品質化・高性能
化した無刷子電動機が得られる。The main magnetic pole 6 made of a sintered ferrite polar anisotropic magnet, the sensor magnetic pole 7 made of an isotropic resin magnet, and the shaft 9 are integrally molded and solidified with a thermoplastic resin 5 such as PBT. By configuring the magnet rotor 8 by
Since the inner diameter of the sintered ferrite polar anisotropic magnet and the isotropic resin magnet and the lamination of the rotor core and the press-fitting of the shaft 9 into the rotor core are not required, the magnet can be manufactured stably at low cost. Therefore, the number of parts can be reduced, and the processing time until the magnet rotor 8 is completed can be reduced. Further, since all the parts are positioned and manufactured with the resin molding die based on the outer shape, it is possible to suppress weight imbalance and unevenness of sensor signals. Therefore, it is possible to obtain a brushless electric motor which is less expensive and has reduced vibration, reduced size, reduced weight, reduced power consumption, improved quality and improved performance.
【００４６】また、主磁極部６とセンサ用磁極部７との
隙間５ａに熱可塑性樹脂５を介在させて一体成形するこ
とによって、主磁極部６およびセンサ用磁極部７の軸方
向端面の平行度や表面粗さ・磁極面との垂直度の精度を
高くする必要がなくなるので、磁石金型の高精度化や端
面研磨が不要となり、コスト低減ができる。したがっ
て、より低コスト化した無刷子電動機が得られる。Also, the thermoplastic resin 5 is interposed in the gap 5a between the main magnetic pole portion 6 and the sensor magnetic pole portion 7 so as to be integrally formed, so that the axial end surfaces of the main magnetic pole portion 6 and the sensor magnetic pole portion 7 are parallel to each other. It is not necessary to increase the accuracy of the degree, the surface roughness, and the perpendicularity to the magnetic pole surface, so that it is not necessary to increase the precision of the magnet mold and to polish the end faces, thereby reducing the cost. Therefore, a brushless motor with lower cost can be obtained.
【００４７】また、２ｍｍ以上の高さを有する電子部品
１３ａおよび駆動ＩＣ１２の接続脚１２ａなどを電気的
に接続する半田部１２ｂをセンサ用磁極部７である等方
性樹脂磁石の外径から外側および主磁極部６である焼結
フェライト極異方性磁石の外径より内側の範囲にある空
間部１５に位置させる構成とすることによって、等方性
樹脂磁石の外径から外側および焼結フェライト極異方性
磁石の外径より内側の範囲にある空間部１５を有効に活
用できるため、無刷子電動機の軸方向長さが一層短くで
き、熱硬化性樹脂１６の量も削減できる。したがって、
一層の小型化・軽量化・低コスト化した無刷子電動機が
得られる。The solder part 12b for electrically connecting the electronic component 13a having a height of 2 mm or more and the connection leg 12a of the drive IC 12 is located outside the outer diameter of the isotropic resin magnet serving as the sensor magnetic pole part 7. By being located in the space 15 which is located inside the outer diameter of the sintered ferrite polar anisotropic magnet which is the main magnetic pole portion 6, the outer ferrite from the outer diameter of the isotropic resin magnet and the sintered ferrite Since the space 15 inside the outer diameter of the polar anisotropic magnet can be effectively utilized, the axial length of the brushless motor can be further reduced, and the amount of the thermosetting resin 16 can be reduced. Therefore,
A brushless motor with further reduced size, weight, and cost can be obtained.
【００４８】なお、実施例１ではセンサ用磁極部７とし
て等方性樹脂磁石を使用したが、等方性ゴム磁石として
もよく、その作用効果に差異を生じない。さらに、軸方
向に磁性粉体のフェライト微粒子の磁化容易軸が配向さ
れた軸方向異方性樹脂磁石または軸方向異方性ゴム磁石
を使用した磁石回転子としてもよく、その場合はセンサ
用磁極部の軸方向長さも短くできる。さらに、センサ用
磁極部の着磁電圧も下げることが可能となり、加工に要
する電力が削減できるとともに、主磁極部におけるセン
サ用磁極部近傍の磁束量の低下が抑制可能となるので、
固定子鉄心に鎖交する磁束量は増加する。したがって、
低振動、より一層の低コスト・小型化・軽量化・低消費
電力の無刷子電動機が得られる。In the first embodiment, an isotropic resin magnet is used as the sensor magnetic pole portion 7. However, an isotropic rubber magnet may be used, and there is no difference in operation and effect. Further, a magnet rotor using an axially anisotropic resin magnet or an axially anisotropic rubber magnet in which the axis of easy magnetization of ferrite fine particles of magnetic powder is oriented in the axial direction may be used. The axial length of the part can also be shortened. Further, the magnetizing voltage of the sensor magnetic pole portion can be reduced, and the power required for processing can be reduced, and the decrease in the amount of magnetic flux near the sensor magnetic pole portion in the main magnetic pole portion can be suppressed.
The amount of magnetic flux linked to the stator core increases. Therefore,
A brushless motor with low vibration, lower cost, smaller size, lighter weight and lower power consumption can be obtained.
【００４９】また、実施例１では主磁極部６とセンサ用
磁極部７との隙間５ａに熱可塑性樹脂５を介在させて一
体成形したが、介在させなくても低振動化・小型化でき
る無刷子電動機が得られる。In the first embodiment, the thermoplastic resin 5 is interposed and formed in the gap 5a between the main magnetic pole 6 and the sensor magnetic pole 7, but the vibration can be reduced and the size can be reduced without the interposition. A brush motor is obtained.
【００５０】（実施例２）図３〜図１０に示すように、
１８はシャフト９に焼結フェライト極異方性磁石よりな
る主磁極部６をＰＢＴなどの熱可塑性樹脂にて一体成形
して構成された磁石回転子であり、主磁極部６は保持部
１９にて保持されている。２０は保持部１９に軸方向に
略直立して一体的に設けられた複数の突部で、センサ用
磁極部２１を位置決め、保持する。また、突部２０が設
けられた保持部１９のセンサ用磁極部側軸方向端面１９
ａは主磁極部６のセンサ用磁極部側軸方向端面６ａを部
分的に環状に覆うよう形成されている。そして、センサ
用磁極部２１は異方性のゴム磁石をトムソン型など簡単
で安価な金型によって略環状に打ち抜かれて形成される
とともに、突部２０に嵌合するための複数の貫通穴２２
も同時に打ち抜かれて設けられている。センサ用磁極部
２１の固定は突部２０に貫通穴２２を嵌合させた後、突
部２０の先端部２０ａを超音波溶着または熱溶着または
高周波溶着またはインパルス溶着などで潰して固定され
る。その他の構成は実施例１と同一である。(Embodiment 2) As shown in FIGS.
Reference numeral 18 denotes a magnet rotor formed by integrally molding a main magnetic pole portion 6 made of a sintered ferrite polar anisotropic magnet on a shaft 9 with a thermoplastic resin such as PBT. Has been held. Reference numeral 20 denotes a plurality of protrusions provided integrally and substantially upright in the axial direction on the holding portion 19 to position and hold the sensor magnetic pole portion 21. Further, an axial end surface 19 of the holding portion 19 provided with the protrusion 20 on the sensor magnetic pole portion side.
a is formed so as to partially annularly cover the axial end face 6a of the main magnetic pole 6 on the sensor magnetic pole side. The sensor magnetic pole portion 21 is formed by punching an anisotropic rubber magnet into a substantially annular shape by a simple and inexpensive mold such as a Thomson type, and a plurality of through holes 22 for fitting into the protrusion 20.
Are also punched out at the same time. The sensor magnetic pole portion 21 is fixed by fitting the through hole 22 to the protrusion 20 and then crushing the tip portion 20a of the protrusion 20 by ultrasonic welding, heat welding, high frequency welding, impulse welding, or the like. Other configurations are the same as those of the first embodiment.
【００５１】このような本発明の無刷子電動機によれ
ば、保持部１９は主磁極部６とシャフト９をＰＢＴなど
の熱可塑性樹脂で一体成形することによって、シャフト
９の軸心に対する主磁極部６，突部２０，センサ用磁極
部２１の位置精度が高くなるとともに、加工工数も削減
できるので、高品質化、低コスト化した無無刷子電動機
が得られる。According to the brushless motor of the present invention, the holding portion 19 is formed by integrally molding the main magnetic pole portion 6 and the shaft 9 with a thermoplastic resin such as PBT so that the main magnetic pole portion with respect to the axis of the shaft 9 is formed. 6, since the positional accuracy of the protrusion 20 and the sensor magnetic pole portion 21 is increased and the number of processing steps can be reduced, a high quality and low cost brushless motor can be obtained.
【００５２】また、突部２０が設けられた保持部１９の
センサ用磁極部側軸方向端面１９ａは主磁極部６のセン
サ用磁極部側軸方向端面６ａを部分的に環状に覆うよう
形成することによって、主磁極部６およびセンサ用磁極
部２１の軸方向端面の平行度や表面粗さ・磁極面との垂
直度の精度を高くする必要がなくなるので、磁石金型の
高精度化や端面研磨が不要となり、コスト低減ができ
る。したがって、より低コスト化した無刷子電動機が得
られる。The axial end face 19a of the holding portion 19 provided with the protrusion 20 is formed so as to partially annularly cover the axial end face 6a of the main magnetic pole portion 6 on the sensor magnetic pole side. This eliminates the need to increase the parallelism of the axial end surfaces of the main magnetic pole portion 6 and the sensor magnetic pole portion 21 and the accuracy of the surface roughness / perpendicularity to the magnetic pole surface. Polishing becomes unnecessary, and cost can be reduced. Therefore, a brushless motor with lower cost can be obtained.
【００５３】また、保持部１９の突部２０にセンサ用磁
極部２１の貫通穴２２を嵌合させる構造とすることによ
って、主磁極部６に対するセンサ用磁極部２１の正確な
位置合わせが容易になるうえ、主磁極部６の外径とセン
サ用磁極部２１の外径の平行度が均一になるため、重量
アンバランスやセンサ信号の不均一を抑制できるので、
高品質化，高性能化した無刷子電動機が得られる。Further, by providing a structure in which the through hole 22 of the sensor magnetic pole portion 21 is fitted to the projection 20 of the holding portion 19, accurate positioning of the sensor magnetic pole portion 21 with respect to the main magnetic pole portion 6 is facilitated. In addition, since the parallelism of the outer diameter of the main magnetic pole 6 and the outer diameter of the magnetic pole 21 for the sensor becomes uniform, it is possible to suppress weight imbalance and non-uniformity of the sensor signal.
A brushless motor with higher quality and higher performance can be obtained.
【００５４】また、突部２０の先端部２０ａを潰してセ
ンサ用磁極部２１を固定して磁石回転子１８を構成する
ことによって、高温炉などを使用する接着が不要とな
り、磁石回転子を製造する加工工数，加工費および投資
費用が低減できるとともに、磁石回転子１８の製造を２
工程とすることができるため、生産タクトが短くなり、
生産能力が増大し、コスト低減ができるため、低コスト
化した無刷子電動機が得られる。Further, by forming the magnet rotor 18 by crushing the tip portion 20a of the projection 20 and fixing the magnetic pole portion 21 for the sensor, bonding using a high-temperature furnace or the like becomes unnecessary, and the magnet rotor is manufactured. The number of processing steps, processing costs and investment costs can be reduced, and the manufacturing of the magnet rotor 18 is reduced by two.
Because it can be a process, production tact is shortened,
Since the production capacity is increased and the cost can be reduced, a brushless motor with reduced cost can be obtained.
【００５５】また、ゴム磁石を単純な構造のトムソン型
で打ち抜いて構成できるので、投資費用が大幅に削減で
き、より一層低コスト化した無刷子電動機が得られる。Further, since the rubber magnet can be formed by punching with a Thomson type having a simple structure, the investment cost can be greatly reduced, and a brushless motor with further reduced cost can be obtained.
【００５６】なお、実施例２ではシャフト９に焼結フェ
ライト極異方性磁石よりなる主磁極部６をＰＢＴなどの
熱可塑性樹脂にて一体成形することによって保持部１９
を形成したが、アルミニウム，亜鉛，マグネシウム合金
など軟質金属で保持部を形成してもよく、その作用効果
に差異を生じない。また、保持部を軟質金属にすること
によって、８０℃を越える高温域での無刷子電動機の使
用が可能となる。In the second embodiment, the main magnetic pole portion 6 made of a sintered ferrite polar anisotropic magnet is integrally formed on the shaft 9 with a thermoplastic resin such as PBT to form the holding portion 19.
Is formed, but the holding portion may be formed of a soft metal such as aluminum, zinc, and magnesium alloy, so that there is no difference in operation and effect. Further, by using a soft metal for the holding portion, it is possible to use the brushless motor in a high temperature range exceeding 80 ° C.
【００５７】また、図６（ａ）、（ｂ）に示すように、
突部２０の先端部２０ｂを環状など薄肉で形成すること
によって、先端部２０ｂを容易に潰すことが可能とな
り、加工時間が短縮されるので、生産タクトが短くな
り、生産能力が増大し、コスト低減ができるため、より
低コスト化した無刷子電動機が得られる。As shown in FIGS. 6A and 6B,
By forming the distal end portion 20b of the projection 20 with a thin thickness such as an annular shape, the distal end portion 20b can be easily crushed, and the processing time is shortened, so that the production tact is shortened, the production capacity is increased, and the cost is increased. Since reduction is possible, a brushless motor with lower cost can be obtained.
【００５８】また、図７（ａ）、（ｂ）および図８に示
すように、貫通穴２２を段付き貫通穴２２ａや、すり鉢
状貫通穴２２ｃとなるよう樹脂磁石を成形してセンサ用
磁極部２１ａを形成することによって、突部２０への嵌
合が容易になるので、加工時間が短縮され、生産タクト
が短くなり、生産能力が増大し、コスト低減ができるた
め、より低コスト化した無刷子電動機が得られる。As shown in FIGS. 7A, 7B, and 8, a resin magnet is formed by forming the through hole 22 into a stepped through hole 22a or a mortar-shaped through hole 22c. By forming the portion 21a, the fitting to the protruding portion 20 becomes easy, so that the processing time is shortened, the production tact is shortened, the production capacity is increased, and the cost can be reduced. A brushless motor is obtained.
【００５９】また、段付き貫通穴の大径部のみすり鉢状
としてもよく、その作用効果に差異を生じない。Further, the large diameter portion of the stepped through hole may be formed in a mortar shape, so that there is no difference in operation and effect.
【００６０】さらに、図９および図１０に示すように、
段付き貫通穴２２ａの小径側を主磁極部６側に位置させ
て突部２０に嵌合し、突部２０の先端部２０ａを段付き
貫通穴２２ａの大径部空間２２ｂ内に潰してセンサ用磁
極部２１ａを固定することによって、磁石回転子１８ａ
の磁石部の軸方向長さが短くできるので、プリント基板
１０を磁石部に近付けることが可能となり、無刷子電動
機の軸方向長さをより一層短くできるため、一層の軽量
化、小型化、低コスト化した無刷子電動機が得られる。Further, as shown in FIGS. 9 and 10,
The small diameter side of the stepped through hole 22a is positioned on the side of the main magnetic pole portion 6 and fitted into the projection 20, and the tip end 20a of the projection 20 is crushed into the large diameter space 22b of the stepped through hole 22a to provide a sensor. By fixing the magnetic pole portion 21a, the magnet rotor 18a
Since the axial length of the magnet portion can be shortened, the printed circuit board 10 can be brought closer to the magnet portion, and the axial length of the brushless motor can be further shortened. A brushless motor with reduced cost can be obtained.
【００６１】（実施例３）図１１に示すように、２３は
シャフト９に焼結フェライト極異方性磁石よりなる主磁
極部６と、複数の段付き貫通穴２２ａを有する軸方向異
方性の樹脂磁石よりなるセンサ用磁極部２１ａとを軸方
向に空間を設けて並べ、ＰＢＴなどの熱可塑性樹脂２４
にて段付き貫通穴２２ａに樹脂を充填するとともに一体
成形して構成された磁石回転子であり、熱可塑性樹脂２
４の充填は段付き貫通穴２２ａの大径部空間２２ｂ内に
とどめている。その他の構成は実施例１と同一である。(Embodiment 3) As shown in FIG. 11, reference numeral 23 denotes an axially anisotropic member having a main magnetic pole portion 6 formed of a sintered ferrite anisotropic magnet on a shaft 9 and a plurality of stepped through holes 22a. The sensor magnetic pole portion 21a made of a resin magnet is arranged side by side with a space provided in the axial direction.
The magnet rotor is formed by filling the stepped through hole 22a with resin and integrally molding the same.
Filling 4 is kept in the large-diameter portion space 22b of the stepped through hole 22a. Other configurations are the same as those of the first embodiment.
【００６２】このような本発明の無刷子電動機によれ
ば、センサ用磁極部２１ａの固定が堅固になるので、セ
ンサ用磁極部２１ａの空回り，重量アンバランスやセン
サ信号の不均一を確実に抑制でき、高品質化した無刷子
電動機が得られる。According to such a brushless motor of the present invention, since the sensor magnetic pole portion 21a is firmly fixed, idling of the sensor magnetic pole portion 21a, weight imbalance, and nonuniformity of the sensor signal are surely suppressed. A high quality brushless motor can be obtained.
【００６３】また、高温炉などを使用する接着が不要と
なり、磁石回転子２３を製造する加工工数，加工費およ
び投資費用が低減できるので、低コスト化した無刷子電
動機が得られる。In addition, since bonding using a high-temperature furnace or the like is not required, the number of processing steps, processing cost, and investment cost for manufacturing the magnet rotor 23 can be reduced, so that a low-cost brushless motor can be obtained.
【００６４】また、熱可塑性樹脂２４の充填を段付き貫
通穴２２ａの大径部空間２２ｂ内にとどめ、センサ用磁
極部２１ａの軸方向端面を抱くような成形をしない構造
とすることによって、樹脂量が減少するとともに、成形
タクトも短縮でき、磁石回転子２３の磁石部の軸方向長
さが短くできるので、プリント基板を磁石部に近付ける
ことが可能となり、無刷子電動機の軸方向長さをより一
層短くできるため、一層の軽量化、小型化、低コスト化
した無刷子電動機が得られる。Further, by filling the thermoplastic resin 24 in the large-diameter portion space 22b of the stepped through hole 22a and not forming the sensor magnetic pole portion 21a in the axial direction, the resin is formed. As the amount decreases, the molding tact time can be shortened, and the axial length of the magnet portion of the magnet rotor 23 can be shortened. Therefore, the printed circuit board can be brought closer to the magnet portion, and the axial length of the brushless motor can be reduced. Since the length can be further reduced, a brushless motor with further reduced weight, size and cost can be obtained.
【００６５】また、主磁極部６とセンサ用磁極部２１ａ
との間に熱可塑性樹脂２４を介在させて一体成形するこ
とによって、主磁極部６およびセンサ用磁極部２１ａの
軸方向端面の平行度や表面粗さ・磁極面との垂直度の精
度を高くする必要がなくなるので、磁石金型の高精度化
や端面研磨が不要となり、コスト低減ができ、より低コ
スト化した無刷子電動機が得られる。The main magnetic pole portion 6 and the sensor magnetic pole portion 21a
And the integral molding with a thermoplastic resin 24 interposed therebetween, the parallelism of the axial end surfaces of the main magnetic pole portion 6 and the sensor magnetic pole portion 21a and the accuracy of surface roughness and perpendicularity with the magnetic pole surface are improved. This eliminates the need to perform the process, so that it is not necessary to increase the precision of the magnet mold and to polish the end face, thereby reducing the cost and obtaining a brushless motor with lower cost.
【００６６】[0066]
【発明の効果】以上の実施例から明らかなように、本発
明によれば、主磁極部を焼結フェライト極異方性磁石で
形成し、センサ用磁極部を主磁極部の外径よりも小さい
等方性樹脂磁石または等方性ゴム磁石で形成し、主磁極
部とセンサ用磁極部は軸方向に並んで位置した磁石回転
子の構成とすることによって、適正な鎖交磁束を確保し
た上で主磁極部の軸方向長さを短くするなど磁石ボリュ
ームを減少でき、固定子鉄心の磁気中心と回転トルクを
発生する主磁極部の磁気中心とが一致するので、軸方向
の振動の発生が抑制できる。また、磁気飽和が抑制さ
れ、鎖交磁束が正弦波になるため、常に誘起電圧位相に
対して最適な通電位相で運転できるので、トルクリップ
ル・トルク変化率の増大が抑制され、回転方向の振動の
増大が抑制される。また、磁石ボリュームを減らすこと
ができるため、コスト低減・小型化・軽量化ができる。
したがって、低コスト・低振動・小型化・軽量化の無刷
子電動機が得られる。As is apparent from the above embodiments, according to the present invention, the main magnetic pole portion is formed of a sintered ferrite anisotropic magnet, and the magnetic pole portion for the sensor is larger than the outer diameter of the main magnetic pole portion. The main magnetic pole part and the magnetic pole part for the sensor are formed of a small isotropic resin magnet or isotropic rubber magnet, and the main magnetic pole part and the magnetic pole part for sensor are arranged side by side in the axial direction. The magnet volume can be reduced by shortening the axial length of the main magnetic pole part above, and the magnetic center of the stator core matches the magnetic center of the main magnetic pole part that generates rotational torque, so that axial vibration is generated. Can be suppressed. In addition, since magnetic saturation is suppressed and the interlinkage magnetic flux becomes a sine wave, operation can always be performed at the optimum energizing phase with respect to the induced voltage phase, so that an increase in the torque ripple / torque change rate is suppressed and vibration in the rotational direction is suppressed. Is suppressed. Further, since the magnet volume can be reduced, the cost, size, and weight can be reduced.
Therefore, a brushless motor with low cost, low vibration, small size, and light weight can be obtained.
【００６７】また、センサ用磁極部を形成するゴム磁石
はシート状の磁石を略環状に打ち抜いて構成とすること
により、ゴム磁石を単純な構造のトムソン型で打ち抜い
て形成できるので、投資費用が大幅に削減できるので、
より一層低コスト化した無刷子電動機が得られる。Further, since the rubber magnet forming the magnetic pole portion for the sensor is formed by punching out a sheet-like magnet into a substantially annular shape, the rubber magnet can be formed by punching out the rubber magnet with a Thomson type having a simple structure. Because it can be greatly reduced,
A brushless motor with even lower cost can be obtained.
【００６８】また、軸方向に磁性粉体のフェライト微粒
子の磁化容易軸が配向された軸方向異方性樹脂磁石また
は軸方向異方性ゴム磁石を使用した磁石回転子とするこ
とによって、センサ用磁極部の軸方向長さも短くでき、
センサ用磁極部の着磁電圧も下げることが可能となり、
加工に要する電力が削減できるとともに、主磁極部にお
けるセンサ用磁極部近傍の磁束量の低下が抑制可能とな
るので、固定子鉄心に鎖交する磁束量は増加する。した
がって、低振動、より一層の低コスト・小型化・軽量化
・低消費電力の無刷子電動機が得られる。Further, a magnet rotor using an axially anisotropic resin magnet or an axially anisotropic rubber magnet in which the axis of easy magnetization of ferrite fine particles of magnetic powder is oriented in the axial direction makes it possible to use a magnet rotor for a sensor. The axial length of the magnetic pole can be shortened,
It is also possible to lower the magnetizing voltage of the sensor magnetic pole,
Since the power required for processing can be reduced and the decrease in the amount of magnetic flux near the sensor magnetic pole portion in the main magnetic pole portion can be suppressed, the magnetic flux amount linked to the stator core increases. Therefore, a brushless motor with low vibration, lower cost, smaller size, lighter weight and lower power consumption can be obtained.
【００６９】また、センサ用磁極部を形成する磁石は複
数の貫通穴を設けた構成とすることにより、主磁極部に
対するセンサ用磁極部の正確な位置合わせが容易にでき
るので、磁石回転子を製造する加工工数が低減でき、重
量アンバランスやセンサ信号の不均一を抑制でき、低コ
スト化，高品質化，高性能化の無刷子電動機が得られ
る。Further, since the magnet forming the sensor magnetic pole portion is provided with a plurality of through holes, accurate positioning of the sensor magnetic pole portion with respect to the main magnetic pole portion can be easily performed. The number of processing steps to be manufactured can be reduced, the weight imbalance and the unevenness of the sensor signal can be suppressed, and a brushless motor with low cost, high quality, and high performance can be obtained.
【００７０】また、センサ用磁極部を構成する磁石に設
けられた複数の貫通穴は段付き貫通穴とした磁石回転子
の構成としたものであり、主磁極部に対するセンサ用磁
極部の正確な位置合わせが一層容易になるので、磁石回
転子を製造する加工工数がより低減でき、重量アンバラ
ンスやセンサ信号の不均一を抑制でき、低コスト化，高
品質化，高性能化の無刷子電動機が得られる。The plurality of through holes provided in the magnet constituting the magnetic pole portion for the sensor are configured as a magnet rotor having a stepped through hole, so that the accuracy of the magnetic pole portion for the sensor with respect to the main magnetic pole portion is accurate. Since the alignment is easier, the number of man-hours for manufacturing the magnet rotor can be reduced, the weight imbalance and the unevenness of the sensor signal can be suppressed, and the brushless motor with low cost, high quality, and high performance. Is obtained.
【００７１】また、センサ用磁極部を構成する磁石に設
けられた複数の貫通穴はすり鉢状貫通穴とした磁石回転
子の構成としたものであり、主磁極部に対するセンサ用
磁極部の正確な位置合わせが一層容易になるので、磁石
回転子を製造する加工工数がより低減でき、重量アンバ
ランスやセンサ信号の不均一を抑制でき、低コスト化，
高品質化，高性能化の無刷子電動機が得られる。The plurality of through holes provided in the magnet constituting the magnetic pole portion for the sensor are configured as a magnet rotor having a mortar-shaped through hole, and the accurate arrangement of the magnetic pole portion for the sensor with respect to the main magnetic pole portion. Since the alignment becomes easier, the number of man-hours for manufacturing the magnet rotor can be reduced, the weight imbalance and the unevenness of the sensor signal can be suppressed, and the cost can be reduced.
A brushless motor with high quality and high performance can be obtained.
【００７２】また、突部の先端部を潰してセンサ用磁極
部を固定して磁石回転子を構成することによって、高温
炉などを使用する接着が不要となり、磁石回転子を製造
する加工工数，加工費および投資費用が低減できるとと
もに、磁石回転子の製造を２工程とすることができるた
め、生産タクトが短くなり、生産能力が増大し、コスト
低減ができるため、低コスト化の無刷子電動機が得られ
る。Further, by forming the magnet rotor by crushing the tip of the projection and fixing the magnetic pole portion for the sensor, bonding using a high-temperature furnace or the like becomes unnecessary, and the number of processing steps for manufacturing the magnet rotor is reduced. Since the processing cost and investment cost can be reduced, and the magnet rotor can be manufactured in two steps, the production tact is shortened, the production capacity is increased, and the cost can be reduced. Is obtained.
【００７３】また、段付き貫通穴またはすり鉢状貫通穴
の小径側を主磁極部側に位置させて突部に嵌合し、突部
の先端部を段付き貫通穴またはすり鉢状貫通穴の大径部
空間内に潰してセンサ用磁極部を固定することによっ
て、磁石回転子の磁石部の軸方向長さが短くできるの
で、プリント基板を磁石部に近付けることが可能とな
り、無刷子電動機の軸方向長さをより一層短くできるた
め、一層の軽量化、小型化、低コスト化の無刷子電動機
が得られる。Further, the small-diameter side of the stepped through hole or the mortar-shaped through hole is positioned on the main magnetic pole portion side and fitted to the projection, and the tip end of the projection is larger than the stepped through hole or the mortar-shaped through hole. By fixing the sensor magnetic pole portion by crushing it in the radial space, the axial length of the magnet portion of the magnet rotor can be shortened, so that the printed circuit board can be brought closer to the magnet portion, and the shaft of the brushless motor can be reduced. Since the length in the direction can be further reduced, a brushless motor with further reduction in weight, size and cost can be obtained.
【００７４】また、突部の先端部を薄肉で形成すること
によって、先端部を容易に潰すことが可能となり、加工
時間が短縮されるので、生産タクトが短くなり、生産能
力が増大し、コスト低減ができるため、より低コストの
無刷子電動機が得られる。Further, by forming the distal end of the projection with a thin wall, the distal end can be easily crushed, and the processing time is shortened, so that the production tact is shortened, the production capacity is increased, and the cost is increased. Because of the reduction, a brushless motor with lower cost can be obtained.
【００７５】また、複数の貫通穴に樹脂を充填するとと
もに一体成形して構成することによって、センサ用磁極
部の固定が堅固になるので、センサ用磁極部の空回り，
重量アンバランスやセンサ信号の不均一を確実に抑制で
きるとともに、高温炉などを使用する接着が不要とな
り、磁石回転子を製造する加工工数，加工費および投資
費用が低減できるので、高品質化・低コストの無刷子電
動機が得られる。Further, since the plurality of through-holes are filled with resin and integrally molded, the fixing of the sensor magnetic pole portion is firmly performed.
Weight unbalance and sensor signal non-uniformity can be reliably suppressed, and bonding using a high-temperature furnace or the like is not required, and the number of processing steps, processing costs, and investment costs for manufacturing the magnet rotor can be reduced, resulting in higher quality. A low-cost brushless motor can be obtained.
【図１】本発明の実施例１における無刷子電動機の構造
を示す縦断面図FIG. 1 is a longitudinal sectional view showing a structure of a brushless motor according to a first embodiment of the present invention.
【図２】同無刷子電動機の磁石回転子の縦断面図FIG. 2 is a longitudinal sectional view of a magnet rotor of the brushless motor.
【図３】本発明の実施例２における無刷子電動機の構造
を示す縦断面図FIG. 3 is a longitudinal sectional view showing a structure of a brushless motor according to a second embodiment of the present invention.
【図４】同無刷子電動機のセンサ用磁極部の斜視図FIG. 4 is a perspective view of a sensor magnetic pole portion of the brushless motor.
【図５】同無刷子電動機のセンサ用磁極部を取り付ける
前の磁石回転子の斜視図FIG. 5 is a perspective view of a magnet rotor before a sensor magnetic pole portion of the brushless motor is mounted.
【図６】（ａ）同無刷子電動機のセンサ用磁極部を取り
付ける前の磁石回転子における他の斜視図 （ｂ）同無刷子電動機のセンサ用磁極部を取り付ける前
の磁石回転子における他の斜視図FIG. 6A is another perspective view of the magnet rotor before the sensor magnetic pole portion of the brushless motor is mounted. FIG. 6B is another perspective view of the magnet rotor before the sensor magnetic pole portion of the brushless motor is mounted. Perspective view
【図７】（ａ）同無刷子電動機における他のセンサ用磁
極部の斜視図 （ｂ）同無刷子電動機における他のセンサ用磁極部の断
面図FIG. 7A is a perspective view of another sensor magnetic pole portion in the brushless motor. FIG. 7B is a cross-sectional view of another sensor magnetic pole portion in the brushless motor.
【図８】同無刷子電動機における他のセンサ用磁極部の
断面図FIG. 8 is a sectional view of another sensor magnetic pole portion in the brushless motor.
【図９】同無刷子電動機における他の磁石回転子の縦断
面図FIG. 9 is a longitudinal sectional view of another magnet rotor in the brushless motor.
【図１０】同無刷子電動機における他の構造を示す縦断
面図FIG. 10 is a longitudinal sectional view showing another structure of the brushless motor.
【図１１】本発明の実施例３における無刷子電動機の磁
石回転子の縦断面図FIG. 11 is a longitudinal sectional view of a magnet rotor of a brushless motor according to a third embodiment of the present invention.
【図１２】従来の無刷子電動機の構造を示す縦断面図FIG. 12 is a longitudinal sectional view showing the structure of a conventional brushless motor.
【図１３】同無刷子電動機の固定子、磁石回転子および
プリント基板を示す分解斜視図FIG. 13 is an exploded perspective view showing a stator, a magnet rotor, and a printed board of the brushless motor.
１ 固定子 ２ インシュレータ ３ 電機子巻線 ４ 固定子鉄心 ５ 熱可塑性樹脂 ５ａ 隙間 ６ 主磁極部 ６ａ センサ用磁極部側軸方向端面 ７ センサ用磁極部 ８ 磁石回転子 ９ シャフト １０ プリント基板 １１ ホールＩＣ １２ 駆動ＩＣ １２ａ 接続脚 １２ｂ 半田部 １３ 電子部品 １３ａ ２ｍｍ以上の高さを有する電子部品 １４ 軸受け １５ 空間部 １６ 熱硬化性樹脂 １７ ブラケット １８ 磁石回転子 １８ａ 磁石回転子 １９ 保持部 １９ａ センサ用磁極部側軸方向端面 ２０ 突部 ２０ａ 先端部 ２０ｂ 先端部 ２１ センサ用磁極部 ２１ａ センサ用磁極部 ２２ 貫通穴 ２２ａ 段付き貫通穴 ２２ｂ 大径部空間 ２２ｃ すり鉢状貫通穴 ２３ 磁石回転子 ２４ 熱可塑性樹脂 DESCRIPTION OF SYMBOLS 1 Stator 2 Insulator 3 Armature winding 4 Stator iron core 5 Thermoplastic resin 5a Clearance 6 Main magnetic pole part 6a Sensor magnetic pole part side axial end face 7 Sensor magnetic pole part 8 Magnet rotor 9 Shaft 10 Printed circuit board 11 Hall IC DESCRIPTION OF SYMBOLS 12 Drive IC 12a Connection leg 12b Solder part 13 Electronic component 13a Electronic component having a height of 2 mm or more 14 Bearing 15 Space 16 Thermosetting resin 17 Bracket 18 Magnet rotor 18a Magnet rotor 19 Holding part 19a Magnetic pole part for sensor Lateral axial end surface 20 Protrusion 20a Tip 20b Tip 21 Magnetic pole for sensor 21a Magnetic pole for sensor 22 Through hole 22a Stepped through hole 22b Large diameter space 22c Crate-shaped through hole 23 Magnet rotor 24 Thermoplastic resin
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０２Ｋ 15/03 Ｈ０２Ｋ 21/14 Ｍ 21/14 29/08 29/08 11/00 Ｃ Ｆターム(参考） 5H002 AA04 AA06 AA07 AA09 AB06 AC07 5H019 AA04 AA06 AA07 AA09 AA10 BB05 BB15 BB19 BB22 CC03 DD01 EE04 5H611 BB08 PP05 QQ03 RR02 TT01 TT03 TT06 UA01 5H621 HH02 JK14 JK17 5H622 CA05 DD01 PP03 PP20 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H02K 15/03 H02K 21/14 M 21/14 29/08 29/08 11/00 CF term (reference) 5H002 AA04 AA06 AA07 AA09 AB06 AC07 5H019 AA04 AA06 AA07 AA09 AA10 BB05 BB15 BB19 BB22 CC03 DD01 EE04 5H611 BB08 PP05 QQ03 RR02 TT01 TT03 TT06 UA01 5H621 HH02 JK05 JK01 PP622
Claims (10)
子と、極異方性磁石を用いた磁石回転子と、ホールＩＣ
などの電子部品を実装したプリント基板とを内蔵した無
刷子電動機であって、前記磁石回転子は焼結極異方性磁
石よりなる環状の主磁極部と、この主磁極部の外径より
も小さい外径で略環状の樹脂磁石またはゴム磁石よりな
るセンサ用磁極部から構成され、主磁極部とセンサ用磁
極部は軸方向に並んで位置したことを特徴とする無刷子
電動機。1. A stator in which an armature winding is wound around a stator core, a magnet rotor using a polar anisotropic magnet, and a Hall IC.
A brushless motor incorporating a printed board on which electronic components such as are mounted, wherein the magnet rotor has an annular main magnetic pole portion made of a sintered pole anisotropic magnet and an outer diameter of the main magnetic pole portion. A brushless motor comprising a sensor magnetic pole portion having a small outer diameter and made of a substantially annular resin magnet or rubber magnet, wherein the main magnetic pole portion and the sensor magnetic pole portion are arranged in the axial direction.
ート状の磁石を略環状に打ち抜いて構成されたことを特
徴とする請求項１記載の無刷子電動機。2. The brushless motor according to claim 1, wherein the rubber magnet constituting the sensor magnetic pole portion is formed by punching a sheet-like magnet into a substantially annular shape.
体微粒子の磁化容易軸は軸方向に異方化されたことを特
徴とする請求項１または２記載の無刷子電動機。3. The brushless motor according to claim 1, wherein the easy axis of magnetization of the magnetic powder particles of the magnet constituting the sensor magnetic pole portion is anisotropic in the axial direction.
貫通穴を設けたことを特徴とする請求項１から３のいず
れかに記載の無刷子電動機。4. The brushless motor according to claim 1, wherein a plurality of through holes are provided in a magnet constituting the sensor magnetic pole portion.
れた複数の貫通穴は段付き貫通穴であることを特徴とす
る請求項４記載の無刷子電動機。5. The brushless motor according to claim 4, wherein the plurality of through holes provided in the magnet constituting the magnetic pole portion for the sensor are stepped through holes.
れた複数の貫通穴はすり鉢状貫通穴であることを特徴と
する請求項４記載の無刷子電動機。6. The brushless motor according to claim 4, wherein the plurality of through holes provided in the magnet constituting the sensor magnetic pole portion are mortar-shaped through holes.
定され、前記保持部はセンサ用磁極部を固定する突部を
有し、この突部に前記センサ用磁極部の貫通穴を嵌合
し、前記突部の先端部を潰して前記センサ用磁極部を固
定したことを特徴とする請求項４から６のいずれかに記
載の無刷子電動機。7. The main magnetic pole portion is fixed to a shaft via a holding portion, and the holding portion has a projection for fixing the sensor magnetic pole portion, and a through hole of the sensor magnetic pole portion is fitted to the projection. The brushless motor according to any one of claims 4 to 6, wherein the sensor magnetic pole portion is fixed by crushing a tip of the protrusion.
定され、前記保持部はセンサ用磁極部を固定する突部を
有し、前記センサ用磁極部の段付き貫通穴またはすり鉢
状貫通穴の小径側を主磁極部側に位置させて前記突部に
嵌合し、前記突部の先端部を前記段付き貫通穴またはす
り鉢状貫通穴の大径部空間内に潰して前記センサ用磁極
部を固定したことを特徴とする請求項６または７記載の
無刷子電動機。8. A main magnetic pole portion is fixed to a shaft via a holding portion, and the holding portion has a projection for fixing a sensor magnetic pole portion, and a stepped through hole or a mortar-shaped through hole of the sensor magnetic pole portion. The small-diameter side of the hole is positioned on the main magnetic pole side and fitted into the protrusion, and the tip of the protrusion is crushed into the large-diameter space of the stepped through hole or the mortar-shaped through hole for the sensor. The brushless motor according to claim 6 or 7, wherein the magnetic pole portion is fixed.
薄肉であることを特徴とする請求項７または請求項８記
載の無刷子電動機。9. The brushless electric motor according to claim 7, wherein at least a tip portion of the protrusion of the holding portion is thin.
部とシャフトを一体成形して構成され、前記センサ用磁
極部の貫通穴には樹脂が充填されたことを特徴とする請
求項４から請求項６のいずれかに記載の無刷子電動機。10. The magnetic rotor according to claim 4, wherein the main magnetic pole part, the magnetic pole part for the sensor, and the shaft are integrally formed, and a through hole of the magnetic pole part for the sensor is filled with resin. A brushless motor according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29506499A JP3672775B2 (en) | 1999-10-18 | 1999-10-18 | Brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29506499A JP3672775B2 (en) | 1999-10-18 | 1999-10-18 | Brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001119876A true JP2001119876A (en) | 2001-04-27 |
| JP3672775B2 JP3672775B2 (en) | 2005-07-20 |
Family
ID=17815859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29506499A Expired - Fee Related JP3672775B2 (en) | 1999-10-18 | 1999-10-18 | Brushless motor |
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| Country | Link |
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| JP (1) | JP3672775B2 (en) |
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