JPH0865985A - Thin motor - Google Patents
Thin motorInfo
- Publication number
- JPH0865985A JPH0865985A JP21428694A JP21428694A JPH0865985A JP H0865985 A JPH0865985 A JP H0865985A JP 21428694 A JP21428694 A JP 21428694A JP 21428694 A JP21428694 A JP 21428694A JP H0865985 A JPH0865985 A JP H0865985A
- Authority
- JP
- Japan
- Prior art keywords
- teeth
- rotational position
- electric motor
- armature
- magnetic sensor
- 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)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、薄型電動機に係り、特
にディスク状記録媒体の回転駆動に好適なブラシレスモ
ータの如くの薄型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 thin electric motor, and more particularly to a thin electric motor such as a brushless motor suitable for rotationally driving a disk-shaped recording medium.
【０００２】[0002]
【従来の技術】近年、コンピュータの外部記憶装置とし
て情報を記録再生するための手段としてフロッピーディ
スク及びハードディスクなどのディスク状記録媒体が多
く用いられていることは周知のことである。2. Description of the Related Art In recent years, it is well known that disk-shaped recording media such as a floppy disk and a hard disk are often used as means for recording and reproducing information as an external storage device of a computer.
【０００３】そして、この種のディスク状記録媒体に記
録される情報は多用化され、その情報量は益々多くなっ
てきているのが現状である。それに伴って、ディスク状
記録媒体に課せられる技術的課題も大容量、高密度とな
っていることから、駆動部である電動機の回転精度も当
然高精度であることが要求されている。そのために、構
成部品の組立て精度を高めたり、ディスク状記録媒体の
振れに大きく起因する回転主部であるベアリングの等級
を高めたり、例えば特開平１−１５２９４７号公報に示
されるようにモータの磁極形状を各種工夫して対応して
いるのが現状である。At present, the information recorded on this type of disc-shaped recording medium is diversified, and the amount of the information is increasing more and more. Along with this, the technical problems imposed on the disk-shaped recording medium are also large in capacity and high in density, so that the rotation accuracy of the electric motor, which is the drive unit, is naturally required to be high. Therefore, the assembling precision of the components is increased, the grade of the bearing, which is the main rotating part largely caused by the shake of the disk-shaped recording medium, is increased, and the magnetic pole of the motor is disclosed, for example, in Japanese Unexamined Patent Publication No. 1-152947. It is the current situation that various shapes are devised to deal with this.
【０００４】図７は薄型電動機である３．５インチフロ
ッピーディスク駆動用の従来のブラシレスモータの断面
図であり、電機子の歯を変形させたものである。即ち、
薄型電動機は図に示すように中央に回転軸３を固定し、
内周面にマグネット１を備え、かつ上部に３．５インチ
フロッピーディスクを載置するロータヨーク２から構成
されているロータ６と、回転軸３を支持すべくベース９
上に固定された焼結含油軸受からなる軸受８と、電機子
４の歯に巻線５を巻回してベース９上に固定されたステ
ータとなる固定電機子７とから構成され、上記巻線５へ
の通電を切替えることによりロータ６が回転駆動され
る。FIG. 7 is a cross-sectional view of a conventional brushless motor for driving a 3.5-inch floppy disk, which is a thin electric motor, in which teeth of an armature are deformed. That is,
The thin electric motor has the rotating shaft 3 fixed in the center as shown in the figure.
A rotor 6 having a magnet 1 on its inner peripheral surface and a rotor yoke 2 on which a 3.5-inch floppy disk is mounted, and a base 9 for supporting a rotating shaft 3.
A bearing 8 made of a sintered oil-impregnated bearing fixed on the upper side, and a fixed armature 7 acting as a stator fixed on a base 9 by winding the winding 5 around the teeth of the armature 4. The rotor 6 is rotationally driven by switching the power supply to 5.
【０００５】上記軸受８は焼結含油合金を用いているた
めに回転軸３と軸受との間には所定のクリアランスが必
要であるが、このクリアランスがロータ６の機械的なア
ンバランスによってロータ６が回転軸３とともに傾いて
すりこぎ運動を起こしてしまう。Since the bearing 8 is made of a sintered oil-impregnated alloy, a predetermined clearance is required between the rotary shaft 3 and the bearing. This clearance is due to the mechanical imbalance of the rotor 6 and the rotor 6 Tilts together with the rotating shaft 3 and causes a pestle movement.
【０００６】また、コイル電流の切替えによりロータ６
が回転する際、歯４とマグネット２の磁極との吸引バラ
ンスの変化、及び回転軸３の上記したクリアランスと相
俟ってディスクに面振れが発生する。このため、ディス
クにトラックずれが生じリード／ライトエラーの原因と
なり高密度記録が困難となる。Further, the rotor 6 is changed by switching the coil current.
When the disk rotates, a wobbling of the disk occurs due to the change of the suction balance between the tooth 4 and the magnetic pole of the magnet 2 and the above-mentioned clearance of the rotary shaft 3. For this reason, track deviation occurs on the disk, which causes a read / write error, making high-density recording difficult.
【０００７】[0007]
【発明が解決しようとする課題】従って従来は上記課題
のために、図８に併せて示す如く複数の歯のうち回転位
置検出用磁気センサ１０1 と隣接する歯を含む所定の歯
４1 〜４3 のみを９０度下に、またそれそらと軸対称位
置にあるものを上に９０度屈曲させて積極的に磁気的ア
ンバランス部を設け、ロータ６が特定のステータ位置で
常に吸引されるようにして、回転軸３にクリアランスが
あってもその回転における偏芯を防止する構造が考えら
れていた。Therefore, in order to solve the above-mentioned problems, a predetermined number of teeth 4 1 to 4 1 including a tooth adjacent to the rotational position detecting magnetic sensor 10 1 among a plurality of teeth, as shown in FIG. Only 4 3 is bent 90 degrees downward, and those axially symmetrical to it are bent 90 degrees upward to positively provide a magnetic unbalance portion, so that the rotor 6 is always attracted at a specific stator position. Thus, there has been considered a structure for preventing eccentricity in the rotation even if the rotary shaft 3 has a clearance.
【０００８】上記構造によると、図７に示すようにマグ
ネット１のベース９側への吸引によりＦ1 ，Ｆ2 なる力
が作用するが、下側に屈曲した歯４1 に作用する力Ｆ2
の方がＦ1 より大となり、回転軸３は常に歯４1 側に傾
いて回転することで上記課題の解決を図っている。[0008] According to the above structure, F 1, F 2 becomes the force by suction to the base 9 side of the magnet 1, as shown in FIG. 7 is applied, the force F 2 acting on the teeth 4 1 bent to the lower side
Is larger than F 1 and the rotary shaft 3 is always inclined and rotated toward the tooth 4 1 side to solve the above problem.
【０００９】しかしながら、一の回転位置検出用磁気セ
ンサ１０1 は９０度屈曲された歯４1 ，４2 間に配置さ
れていることから、回転位置検出用磁気センサ１０1 は
これに極端に接近した歯４1 ，４2 による磁束の影響を
うけてしまって、その出力は図９（Ａ）に示すようにコ
イル電流が重畳してモータ駆動波形が歪むため、振動や
騒音が発生し、その結果としてディスクの面振れ、軸振
れ等によってディスク駆動用には良好な効果を発揮する
に至らなかった。However, since the one rotational position detecting magnetic sensor 10 1 is arranged between the teeth 4 1 and 4 2 bent at 90 degrees, the rotational position detecting magnetic sensor 10 1 is extremely close to this. the teeth 4 1, 4 2 I under the influence of magnetic flux due, its output because distorted motor driving waveform coil current is superimposed as shown in FIG. 9 (a), vibration and noise are generated, that As a result, a good effect for driving the disk has not been achieved due to surface wobbling and shaft wobbling of the disk.
【００１０】[0010]
【課題を解決するための手段】本発明は上記課題に鑑み
てなされたものであり、磁性体からなるベース上に、放
射状に形成された複数の歯を備えた固定電機子の前記歯
間に回転位置検出用磁気センサが配置され、ディスク状
記録媒体を保持し、前記固定電機子と所定の間隔を介し
て対向配置されたマグネットを備えて回転駆動されるロ
ータを有する薄型電動機において、少なくとも前記回転
位置検出用磁気センサと隣接する特定の電機子の歯を除
いた他の歯の少なくとも１つを軸方向に変位させてなる
薄型電動機。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is provided between the teeth of a fixed armature having a plurality of radially formed teeth on a base made of a magnetic material. A thin electric motor having a rotor in which a rotational position detecting magnetic sensor is arranged, holds a disk-shaped recording medium, and is provided with a magnet arranged to face the fixed armature with a predetermined gap, at least, A thin electric motor formed by axially displacing at least one tooth other than the tooth of a specific armature adjacent to the rotational position detecting magnetic sensor.
【００１１】及び磁性体からなるベース上に、放射状に
形成された複数の歯を備えた固定電機子の前記歯間に回
転位置検出用磁気センサが配置され、ディスク状記録媒
体を保持し、前記固定電機子と所定の間隔を介して対向
配置されたマグネットを備えて回転駆動されるロータを
有する薄型電動機において、前記回転位置検出用磁気セ
ンサと隣接する特定の電機子の歯を前記ベース側とは反
対側に変位させてなる薄型電動機をそれぞれ提供する。A magnetic sensor for detecting a rotational position is arranged between the teeth of a fixed armature having a plurality of radially formed teeth on a base made of a magnetic material, and holds a disk-shaped recording medium. In a thin electric motor having a rotor that is rotationally driven with a magnet that is arranged to face a fixed armature with a predetermined gap, a tooth of a specific armature adjacent to the rotational position detecting magnetic sensor is set to the base side. Respectively provide thin electric motors that are displaced to the opposite side.
【００１２】[0012]
【実施例】以下に本発明に係る薄型電動機の一実施例を
図１乃至図６を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a thin electric motor according to the present invention will be described in detail below with reference to FIGS.
【００１３】図１に示すように薄型電動機は、プレス成
形等により椀型に形成されており、回転軸１３を固定し
た中央部にディスク載置部１２ｂを有し、外周部の内面
にマグネット１１を固定したロータヨーク１１とからな
るロータ１６と、回転軸１３を支持すべく磁性体からな
るベース１９上に固定された焼結含油合金からなる軸受
１８を備え、上記マグネット１１と対向し、巻線（コイ
ル）１５が巻回された電機子１４を軸受１８のフランジ
部１８ｂに固定したステータ１７とから構成されてい
る。上記ディスク載置部１２ｂは図示せぬディスクの金
属製ハブのチャツキング孔と嵌合する駆動ピン１２ａ及
び金属製ハブを吸着固定する固定用マグネット１２ｃを
有するものである。As shown in FIG. 1, the thin electric motor is formed into a bowl shape by press molding or the like, has a disk mounting portion 12b in the central portion to which the rotary shaft 13 is fixed, and has a magnet 11 on the inner surface of the outer peripheral portion. A rotor 16 composed of a rotor yoke 11 fixed to the rotor 11, and a bearing 18 composed of a sintered oil-impregnated alloy fixed on a base 19 composed of a magnetic material to support the rotating shaft 13, and the bearing 18 is opposed to the magnet 11 and is wound. The armature 14 around which the (coil) 15 is wound is fixed to the flange portion 18b of the bearing 18 and the stator 17. The disk mounting portion 12b has a drive pin 12a which fits into a chucking hole of a metal hub of a disk (not shown) and a fixing magnet 12c which attracts and fixes the metal hub.
【００１４】上記焼結含油合金からなる軸受１８は、回
転軸１３を支持する円筒部１８ａと下部の円盤状のフラ
ンジ部１８ｂとからなり、このフランジ部１８ｂには電
機子１４及びベース１９に対する複数の位置決め用突起
１８ｃが形成されると共に、ベース１９及び電機子１４
に対する複数の固定用突起１８ｄがそれぞれ一体形成さ
れている。このように軸受１８と各突起部を一体形成す
ることにより、従来採用されている位置決め部品及び固
定用ピンを省略できると同時に、電機子１４に対する回
転位置検出用磁気センサの取付け精度も飛躍的に向上す
るものとなる。固定用突起１８ｄはベース１９及び電機
子１４に先端をカシメることにより固定される。なお、
２２はスラスト軸受である。The bearing 18 made of the above-mentioned sintered oil-impregnated alloy comprises a cylindrical portion 18a for supporting the rotating shaft 13 and a lower disk-shaped flange portion 18b. The flange portion 18b has a plurality of portions for the armature 14 and the base 19. The positioning projection 18c of the base 19 and the armature 14 are formed.
A plurality of fixing protrusions 18d are integrally formed. By integrally forming the bearing 18 and the respective projections in this manner, the conventionally used positioning parts and fixing pins can be omitted, and at the same time, the accuracy in mounting the magnetic sensor for detecting the rotational position on the armature 14 can be dramatically improved. It will be improved. The fixing protrusion 18d is fixed to the base 19 and the armature 14 by crimping the tip. In addition,
22 is a thrust bearing.
【００１５】また、電機子１４は図２に示す如く、複数
の磁性板を積層し放射状に形成して複数個の歯（実施例
では１５個）を備えてなり、複数個の歯のうち隣接する
歯１４ａ，１４ｂ，１４ｃの最外周部分（巻線部分より
突出する部分）は、図５に示す如くベース１９側に寸法
Ｌだけ屈曲変位させてある。Further, as shown in FIG. 2, the armature 14 is formed by laminating a plurality of magnetic plates and radially forming a plurality of teeth (fifteen in the embodiment). The outermost peripheral portions (portions projecting from the winding portions) of the teeth 14a, 14b, 14c are bent and displaced by a dimension L toward the base 19 as shown in FIG.
【００１６】歯１４ａ〜１４ｃの曲げ量は、歯の厚さを
Ｄとし、その変位量をＬとした時、０．１＜Ｌ／Ｄ＜２
なる関係としてある。本実施例ではＬ／Ｄ＝０．４とし
てある。The bending amount of the teeth 14a to 14c is 0.1 <L / D <2, where D is the thickness of the teeth and L is the amount of displacement thereof.
There is as a relationship. In this embodiment, L / D = 0.4.
【００１７】そして、ロータの位置を検出するよう等配
された回転位置検出用磁気センサ２１1 ，２１2 ，２１
3 は屈曲変位された歯１４ａ，１４ｂ，１４ｃとは隣接
しないよう他の歯間にてベース１９上に取付けられてい
る。このように構成された電動機は図１に示すように歯
１４ａ（１４ｂ，１４ｃ）側にはマグネット１１の大な
る吸引力Ｆ2 が作用し、その軸受部は図５に拡大して示
すように回転軸１３と軸受１８とのクリアランス２０が
あってもロータは常に一定の傾斜位置で回転し続け、す
りこぎ運動を発生するようなことはない。The rotational position detecting magnetic sensors 21 1 , 21 2 and 21 equally arranged to detect the position of the rotor.
3 is mounted on the base 19 between the other teeth so as not to be adjacent to the bent and displaced teeth 14a, 14b, 14c. As shown in FIG. 1, the electric motor configured as described above is subjected to a large attractive force F 2 of the magnet 11 on the teeth 14a (14b, 14c) side, and its bearing portion is enlarged as shown in FIG. Even if there is a clearance 20 between the rotating shaft 13 and the bearing 18, the rotor always continues to rotate at a constant tilt position and does not generate a rubbing motion.
【００１８】従って、電機子のコイルに通電しコイル電
流の切替えにより磁界が発生してロータ１６が回転する
際、上記した如く回転位置検出用磁気センサ２１と屈曲
変位された歯１４ａ，１４ｂ，１４ｃとの位置関係によ
り、回転位置検出用磁気センサ２１の出力波形は図９
（Ｂ）のように正弦波状になり従来問題となっていたコ
イル電流の歪による振動等の発生を抑制すると同時にす
りこぎ運動をも回避し得る。さらに、ディスクの振動や
面振れが少なく記録／再生時のリード／ライトエラーが
改善され、高密度記録が可能となる。Therefore, when the rotor 16 is rotated by energizing the coil of the armature and generating a magnetic field by switching the coil current, the rotational position detecting magnetic sensor 21 and the bent and displaced teeth 14a, 14b, 14c as described above. The output waveform of the rotational position detecting magnetic sensor 21 is shown in FIG.
As in the case of (B), it becomes sinusoidal, and it is possible to suppress the occurrence of vibration and the like due to the distortion of the coil current, which has been a problem in the past, and at the same time avoid the rubbed movement. Further, the vibration and surface wobbling of the disk are small and the read / write error at the time of recording / reproducing is improved, and high density recording becomes possible.
【００１９】そして、歯１４ａ〜１４ｃの変位量を０．
１＜Ｌ／Ｄ＜２とすることにより、図６に示すようにロ
ータの振れ量を小とすることができる。Then, the displacement amount of the teeth 14a to 14c is set to 0.
By setting 1 <L / D <2, it is possible to reduce the amount of shake of the rotor as shown in FIG.
【００２０】図３は本発明の他の実施例を示す電機子の
平面図であり、回転位置検出用磁気センサ２１1 ，２１
2 ，２１3 が片側に集中配置されたものであり、各回転
位置検出用磁気センサ２１1 ，２１2 ，２１3 と隣接す
る歯１４ａ〜１４ｄは反ステータ側（マグネット１１の
吸引力の方向と反対の上側）に変位させてある。その変
位量は上記した条件と同様である。このように構成する
ことによっても回転位置検出用磁気センサの出力による
コイル電流の影響を少なくすることができ、上記実施例
と同様の効果を奏し得る。FIG. 3 is a plan view of an armature showing another embodiment of the present invention, in which magnetic sensors 21 1 and 21 for detecting rotational position are shown.
2 and 21 3 are concentrated on one side, and the teeth 14a to 14d adjacent to the rotational position detecting magnetic sensors 21 1 , 21 2 and 21 3 are on the side opposite to the stator (the direction of the attraction force of the magnet 11). It is displaced to the opposite upper side). The amount of displacement is similar to the above-mentioned conditions. With such a configuration, it is possible to reduce the influence of the coil current due to the output of the rotational position detecting magnetic sensor, and it is possible to obtain the same effect as that of the above embodiment.
【００２１】なお、上記の場合、各回転位置検出用磁気
センサ２１1 ，２１2 ，２１3 の回転軸１３に対して軸
対称位置にある歯１４ｊを中心として１つ以上をベース
１９側に変位させても良い。In the above case, one or more of the magnetic sensors 21 1 , 21 2 , 21 3 are displaced toward the base 19 side with respect to the tooth 14j at an axisymmetric position with respect to the rotational axis 13 of each rotational position detecting magnetic sensor 21 1 , 21 2 , 21 3. You may let me.
【００２２】上記実施例における歯の屈曲変位に関して
は、ロータの重量及び形状により曲げる数を増減させて
も同様の効果が得られることは勿論である。Regarding the bending displacement of the teeth in the above embodiment, it is needless to say that the same effect can be obtained even if the number of bending is increased or decreased depending on the weight and shape of the rotor.
【００２３】[0023]
【発明の効果】以上詳述した本発明に係る薄型電動機に
よると、請求項１，２，３にあっては回転位置検出用磁
気センサの出力にコイル電流の影響による振動等の発生
を抑制すると同時にすりこぎ運動をも回避し得、またデ
ィスクの振動や面振れが少なく記録／再生時のリード／
ライトエラーが改善され、高密度記録が可能となる。請
求項４にあっては回転位置検出用磁気センサの位置が任
意に設定でき、請求項５にあってはロータのステータに
対する吸引力を大きくしてすりこぎ運動をより抑制し得
る効果がある。According to the thin electric motor according to the present invention described in detail above, according to the first, second and third aspects, it is possible to suppress the occurrence of vibration or the like due to the influence of the coil current on the output of the magnetic sensor for detecting the rotational position. At the same time, it is possible to avoid rubbed movements, and there is little disc vibration or surface wobbling, which leads to read / write during recording / playback.
Write error is improved and high density recording becomes possible. In the fourth aspect, the position of the magnetic sensor for detecting the rotational position can be arbitrarily set, and in the fifth aspect, the attractive force of the rotor with respect to the stator can be increased to further suppress the rubbing movement.
【図１】本発明の薄型電動機の一実施例を示す断面図で
ある。FIG. 1 is a sectional view showing an embodiment of a thin electric motor of the present invention.
【図２】本発明の薄型電動機の電機子と回転位置検出用
磁気センサとの関係を示す平面図である。FIG. 2 is a plan view showing a relationship between an armature of the thin electric motor of the present invention and a magnetic sensor for detecting a rotational position.
【図３】本発明の薄型電動機の他の実施例の電機子と回
転位置検出用磁気センサとの関係を示す平面図である。FIG. 3 is a plan view showing a relationship between an armature and a rotational position detecting magnetic sensor of another embodiment of the thin electric motor of the invention.
【図４】本発明の薄型電動機の歯の屈曲変位状態を示す
半断面図である。FIG. 4 is a half sectional view showing a bending displacement state of teeth of the thin electric motor of the present invention.
【図５】回転軸と軸受部とのクリアランスの状態を示す
部分拡大断面図である。FIG. 5 is a partial enlarged cross-sectional view showing a state of clearance between a rotary shaft and a bearing portion.
【図６】本発明の薄型電動機の歯の変位量と振れとの関
係を示す図である。FIG. 6 is a diagram showing the relationship between the amount of tooth displacement and runout of the thin electric motor of the present invention.
【図７】従来の電動機の断面図である。FIG. 7 is a cross-sectional view of a conventional electric motor.
【図８】従来の電動機の電機子と回転位置検出用磁気セ
ンサとの関係を示す平面図である。FIG. 8 is a plan view showing a relationship between an armature of a conventional electric motor and a magnetic sensor for detecting a rotational position.
【図９】従来及び本発明の薄型電動機の回転位置検出用
磁気センサの出力波形である。FIG. 9 is an output waveform of a magnetic sensor for detecting a rotational position of the conventional thin motor and the present invention.
１１…マグネット、１２…ロータヨーク、１３…回転
軸、１４…歯、１５…巻線（コイル）、１６…ロータ、
１７…ステータ、２１1 ，２１2 ，２１3 …回転位置検
出用磁気センサ。11 ... Magnet, 12 ... Rotor yoke, 13 ... Rotation shaft, 14 ... Tooth, 15 ... Winding (coil), 16 ... Rotor,
17 ... Stator, 21 1 , 21 2 , 21 3 ... Magnetic sensor for detecting rotational position.
Claims (5)
された複数の歯を備えた固定電機子の前記歯間に回転位
置検出用磁気センサが配置され、ディスク状記録媒体を
保持し、前記固定電機子と所定の間隔を介して対向配置
されたマグネットを備えて回転駆動されるロータを有す
る薄型電動機において、少なくとも前記回転位置検出用
磁気センサと隣接する特定の電機子の歯を除いた他の歯
の少なくとも１つを軸方向に変位させてなる薄型電動
機。1. A magnetic sensor for detecting a rotational position is arranged between the teeth of a stationary armature having a plurality of radially formed teeth on a base made of a magnetic material, and holds a disk-shaped recording medium, In a thin electric motor having a rotor that is rotationally driven with a magnet that is arranged to face the fixed armature with a predetermined gap, at least the teeth of a specific armature adjacent to the magnetic sensor for detecting the rotational position are removed. A thin electric motor in which at least one of the other teeth is axially displaced.
気センサと隣接しない前記歯を前記ベース側に変位させ
てなる薄型電動機。2. The thin electric motor according to claim 1, wherein the teeth that are not adjacent to the magnetic sensor for detecting the rotational position are displaced toward the base side.
された複数の歯を備えた固定電機子の前記歯間に回転位
置検出用磁気センサが配置され、ディスク状記録媒体を
保持し、前記固定電機子と所定の間隔を介して対向配置
されたマグネットを備えて回転駆動されるロータを有す
る薄型電動機において、前記回転位置検出用磁気センサ
と隣接する特定の電機子の歯を前記ベース側とは反対側
に変位させてなる薄型電動機。3. A magnetic sensor for detecting a rotational position is arranged between the teeth of a fixed armature having a plurality of radially formed teeth on a base made of a magnetic material, and holds a disk-shaped recording medium, In a thin electric motor having a rotor that is rotationally driven with a magnet that is arranged to face the fixed armature with a predetermined gap, a tooth of a specific armature adjacent to the magnetic sensor for detecting the rotational position is provided on the base side. A thin electric motor that is displaced to the opposite side.
記歯の厚さをＤとし、その変位量をＬとした時、 ０．１＜Ｌ／Ｄ＜２なる関係を満たしてなる薄型電動
機。4. The thin type as claimed in claim 1, wherein the tooth thickness is D and the displacement amount is L, where 0.1 <L / D <2. Electric motor.
転位置検出用磁気センサと隣接しない特定の歯と略軸対
称位置関係にある他の歯とを互いに反対方向に変位させ
てなる薄型電動機。5. The thin electric motor according to claim 1 or 3, wherein the rotational position detecting magnetic sensor and a specific tooth which is not adjacent to the magnetic sensor are displaced in opposite directions from each other in a substantially axisymmetric positional relationship. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06214286A JP3127977B2 (en) | 1994-08-16 | 1994-08-16 | Thin motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06214286A JP3127977B2 (en) | 1994-08-16 | 1994-08-16 | Thin motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0865985A true JPH0865985A (en) | 1996-03-08 |
| JP3127977B2 JP3127977B2 (en) | 2001-01-29 |
Family
ID=16653220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06214286A Expired - Fee Related JP3127977B2 (en) | 1994-08-16 | 1994-08-16 | Thin motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3127977B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006136094A (en) * | 2004-11-04 | 2006-05-25 | Funai Electric Co Ltd | Rotator drive motor and its annular magnet attaching method |
-
1994
- 1994-08-16 JP JP06214286A patent/JP3127977B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006136094A (en) * | 2004-11-04 | 2006-05-25 | Funai Electric Co Ltd | Rotator drive motor and its annular magnet attaching method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3127977B2 (en) | 2001-01-29 |
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