JP2005117772A - Small-sized motor - Google Patents

Small-sized motor Download PDF

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Publication number
JP2005117772A
JP2005117772A JP2003348297A JP2003348297A JP2005117772A JP 2005117772 A JP2005117772 A JP 2005117772A JP 2003348297 A JP2003348297 A JP 2003348297A JP 2003348297 A JP2003348297 A JP 2003348297A JP 2005117772 A JP2005117772 A JP 2005117772A
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Prior art keywords
magnet
small
motor
housing
bearing
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JP4748429B2 (en
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Tomohide Aoyanagi
智英 青柳
Toshio Suzuki
敏生 鈴木
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Namiki Precision Jewel Co Ltd
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Namiki Precision Jewel Co Ltd
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Priority to JP2003348297A priority Critical patent/JP4748429B2/en
Priority to CN2004800360919A priority patent/CN1890859B/en
Priority to KR1020067008220A priority patent/KR100780837B1/en
Priority to PCT/JP2004/013431 priority patent/WO2005036714A1/en
Priority to TW093128194A priority patent/TW200514335A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/061—Means for converting reciprocating motion into rotary motion or vice versa using rotary unbalanced masses
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • H02K7/075—Means for converting reciprocating motion into rotary motion or vice versa using crankshafts or eccentrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
    • B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
    • B01B1/02—Preventing foaming
    • B01B1/04—Preventing foaming by chemical means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/145—Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized motor which prevents an accident of a bearing from coming off a motor housing interfitting part by the force to a bearing in thrust direction given by fall shock, etc. and achieves its miniaturization in small diameter by curtailing parts count without dropping the output property of itself. <P>SOLUTION: In the small-sized motor, a step, which is orthogonally crossing a rotating shaft, is made at one part of the magnet storage of a motor housing small-diameter part, and also the above step is equipped with a magnet stopping face which retains the above magnet in a noncontact position to the above bearing, by the above magnet abutting on it in the thrust direction of the rotating shaft. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明はコアレスタイプの小型モータに係り、特に回転軸の一端に偏心分銅が取り付けられた振動発生用の小型モータに関するものである。   The present invention relates to a small motor of a coreless type, and more particularly to a small motor for generating vibration in which an eccentric weight is attached to one end of a rotating shaft.

近年、我々の日常生活においては、様々な電子機器に小型モータが搭載されており、それぞれの機器に対し、目的に応じたモータの小型化、軽量化、及び高出力化などの技術開発がなされている。   In recent years, small motors are mounted on various electronic devices in our daily lives, and technology development such as miniaturization, weight reduction, and high output of motors according to the purpose has been made for each device. ing.

無線通信機器である携帯電話においても、この小型モータが搭載されており、例えば、美術館、コンサートホール等の人が集まる静粛な公衆の場や、商談あるいは重要な会議の席において、携帯電話の突然の着信音が、周囲の人に多大な迷惑となる場合がある時などには、着信報知をバイブレーションにより体感振動で知らせる振動発生用の小型モータが用いられる。   Mobile phones, which are wireless communication devices, are also equipped with this small motor. For example, in a quiet public place where people gather, such as museums, concert halls, etc. When there is a case where the incoming ring tone may cause a great deal of trouble to surrounding people, a small motor for generating vibration is used to notify the incoming call notification by vibration.

前記振動発生用の小型モータ（以下、必要に応じて振動モータとする）の場合、駆動する回転軸に偏重心の分銅を取り付けて、ロータ部の回転動作時に分銅等の偏重心位置が振れ回る不均等な遠心力を利用して、携帯電話機全体を振動させるもので、それら携帯電話の普及が進むに連れ、その搭載率及び使用頻度も日々高まっている。   In the case of the above-mentioned small motor for generating vibration (hereinafter referred to as a vibration motor if necessary), an eccentric gravity center weight is attached to the rotating shaft to be driven, and the eccentric gravity center position such as the weight is swung around when the rotor portion is rotated. The mobile phone is vibrated as a whole using an uneven centrifugal force. As the mobile phone becomes more popular, its mounting rate and frequency of use increase daily.

特許文献１に記載の小型モータは、円筒状のモータハウジングの一端部に細い外径の磁石収納部が形成され、軸受と、磁界を発生させる円筒状磁石とは、前記細い外径の磁石収納部の同一面に共に配置され、固定されるようになっている。そのため、円筒状磁石の中心孔に挿入されモータハウジングに対して、円筒状磁石を所定の位置に固定するスリーブを設置する必要がなく、小型モータの径方向の寸法を小さくし、小型モータのさらなる小型化を図ることができる構造となっている。   In the small motor described in Patent Document 1, a magnet housing portion with a thin outer diameter is formed at one end portion of a cylindrical motor housing, and the bearing and the cylindrical magnet for generating a magnetic field include the magnet housing with the thin outer diameter. They are arranged and fixed together on the same surface of the part. Therefore, there is no need to install a sleeve that is inserted into the center hole of the cylindrical magnet and fixes the cylindrical magnet at a predetermined position with respect to the motor housing. The structure can be reduced in size.

また、特許文献２に記載の小型モータのモータハウジングには、軽量化と部品点数削減のため、金属部分を樹脂に代替した樹脂モールド体が取り付けられている。この樹脂モールド体は、回転軸を支持するための軸受部と、円筒状磁石をモータハウジングの所定の位置に固定するスリーブ部と、樹脂モールド体をモータハウジングから外れないようにする保持部と、を樹脂により一体的に形成した部材である。   In addition, a resin mold body in which a metal portion is replaced with a resin is attached to a motor housing of a small motor described in Patent Document 2 in order to reduce weight and reduce the number of parts. The resin mold body includes a bearing portion for supporting the rotation shaft, a sleeve portion for fixing the cylindrical magnet at a predetermined position of the motor housing, a holding portion for preventing the resin mold body from being detached from the motor housing, Is a member integrally formed of resin.

特開２００１−００９３７２号公報JP 2001-009372 A 特開２００１−１３６７０４号公報JP 2001-136704 A

特許文献１に記載の小型モータは、細い外径の収納部の先端側に取り付けられた軸受に対して、円筒状磁石を前記軸受と同一保持面に位置し、スラスト方向で接し対向するように取り付けられたものである。そのため落下衝撃などで円筒状磁石がスラスト方向に移動するような強い力が加えられた場合には、自重が大きい円筒状磁石が移動して、軸受に接触して押す力が働き、押された軸受が前記細い外径の収納部から外れてしまうという問題がある。   In the small motor described in Patent Document 1, the cylindrical magnet is positioned on the same holding surface as the bearing and is opposed to and in contact with the bearing attached to the distal end side of the thin outer diameter storage portion. It is attached. Therefore, when a strong force is applied that causes the cylindrical magnet to move in the thrust direction due to a drop impact, etc., the cylindrical magnet with its own weight moves, and the pressing force is applied to the bearing and pushed. There exists a problem that a bearing will remove | deviate from the accommodating part of the said thin outer diameter.

また、特許文献２に記載の小型モータは、円筒状磁石に対して軸受側に移動するような力が加えられた場合であっても、軸受と一体的に形成された樹脂モールド体は、モータハウジングの内外を結ぶ保持部により、モータハウジングから外れないように構成されている。しかし樹脂モールド体には、スリーブ部分が備えられているので、モータのさらなる小型化のためには、円筒状磁石の外径寸法を小さくする必要がある。この場合、同時に円筒状磁石の表面磁束密度も低減され、小型モータの出力を低下させるという問題があり、モータ小型化への障害となっていた。   In addition, the small motor described in Patent Document 2 has a resin molded body formed integrally with the bearing, even when a force that moves to the bearing side is applied to the cylindrical magnet. A holding portion that connects the inside and outside of the housing is configured not to be detached from the motor housing. However, since the resin mold body is provided with a sleeve portion, it is necessary to reduce the outer diameter of the cylindrical magnet in order to further reduce the size of the motor. In this case, the surface magnetic flux density of the cylindrical magnet is reduced at the same time, and there is a problem that the output of the small motor is lowered, which is an obstacle to miniaturizing the motor.

本発明は、以上のような課題を解決するためになされたものであり、円筒状磁石に対して、スラスト方向軸受側に移動するような強い力が加えられた場合であっても、軸受が磁石収納部から外れることを防ぐことができ、さらに小型モータの出力を低下させずに、さらなる小径と小型化を図ることができる小型モータを提供することを目的とするものである。   The present invention has been made to solve the above-described problems. Even when a strong force is applied to the cylindrical magnet so as to move toward the thrust direction bearing, the bearing is not provided. It is an object of the present invention to provide a small motor that can be prevented from coming off from the magnet housing portion and can be further reduced in diameter and size without lowering the output of the small motor.

上記課題を解決するために、請求項１に記載の発明では、
ステータ部として、一端部が開口されるとともに、他端部が前記一端部開口径より小径に開口された小径部を有するモータハウジングと、前記モータハウジングの少なくとも小径部側端部内径に収納され、ロータ部中心の回転軸を軸支する軸受と、前記モータハウジング内に位置し磁界を発生させる磁石と、前記モータハウジングの前記小径部側端部近傍の内径で、前記磁石を保持固定する磁石収納部と、を備えてなる小型モータにおいて、
前記磁石収納部の一部に、前記回転軸と直交する段差が形成されるとともに、前記段差には、前記磁石が回転軸スラスト方向で当接することにより、前記軸受に対して、前記磁石を回転軸スラスト方向で非接触位置に保持する磁石止面を備える小型モータとしている。 In order to solve the above-mentioned problem, in the invention according to claim 1,
As the stator portion, one end portion is opened and the other end portion is accommodated in an inner diameter at least on the small diameter portion side of the motor housing having a small diameter portion opened to a diameter smaller than the opening diameter of the one end portion, A bearing that supports a rotation shaft at the center of the rotor portion, a magnet that is located in the motor housing and generates a magnetic field, and a magnet housing that holds and fixes the magnet at an inner diameter in the vicinity of the small-diameter side end of the motor housing. A small motor comprising:
A step that is perpendicular to the rotation axis is formed in a part of the magnet housing portion, and the magnet rotates with respect to the bearing by contacting the magnet in the rotation axis thrust direction at the step. A small motor is provided with a magnet stop surface that is held in a non-contact position in the axial thrust direction.

つまり、モータハウジングの内部に、回転軸を支持する軸受と、磁界を発生させる磁石と、が備えられた小型モータにおいて、前記モータハウジングの小径部側端部近傍には、前記磁石を前記軸受と非接触状態の位置に固定配置する磁石止面を有する磁石収納部の段差が備えられている。   That is, in a small motor provided with a bearing for supporting the rotating shaft and a magnet for generating a magnetic field inside the motor housing, the magnet is placed near the small-diameter side end of the motor housing. A step of the magnet storage portion having a magnet stop surface fixedly arranged at a position in a non-contact state is provided.

また、請求項２に記載の発明では、請求項１に記載の小型モータにおいて、
前記磁石収納部の径方向の一部に、前記磁石の外形外周面と当接して、前記磁石をモータハウジングの同心位置に保持固定する磁石固定面を備える小型モータとしている。 Moreover, in invention of Claim 2, in the small motor of Claim 1,
A small motor having a magnet fixing surface that is in contact with the outer peripheral surface of the magnet and is held and fixed at a concentric position of the motor housing on a part of the magnet housing portion in the radial direction.

また、請求項３に記載の発明では、請求項１又は請求項２に記載の小型モータにおいて、
前記モータハウジングの磁石収納部が、前記小径部側端部内径の軸受収納部と異なる内径寸法位置に配置された小型モータとしている。 Moreover, in invention of Claim 3, in the small motor of Claim 1 or Claim 2,
The magnet housing part of the motor housing is a small motor arranged at a position of an inner diameter different from the bearing housing part of the inner diameter of the small diameter part side end.

また、請求項４に記載の発明では、請求項１〜請求項３に記載の小型モータにおいて、
前記ロータ部回転軸の一端に、偏心分銅が取り付けられている振動モータとしている。 Moreover, in invention of Claim 4, in the small motor of Claims 1-3,
A vibration motor is provided in which an eccentric weight is attached to one end of the rotor portion rotation shaft.

以上のように、請求項１に記載された発明によれば、例えば、落下衝撃などにより、自重がある磁石に対して強い力が加えられた場合であっても、磁石の移動（磁石側から端部軸受方向に対して直接的に力が加えられること）を磁石止面の段差で完全に受け止めることができるので、軸受が磁石に押されてモータハウジング端部外方のスラスト方向に外れてしまうことを防ぐことができる。つまりモータハウジングに対し磁石を強固に固定することができ、耐衝撃性に優れた小型モータが得られる。   As described above, according to the first aspect of the present invention, even when a strong force is applied to a magnet with its own weight due to, for example, a drop impact, the movement of the magnet (from the magnet side) The force can be applied directly to the end bearing direction) by the step of the magnet stop surface so that the bearing is pushed by the magnet and disengages in the thrust direction outside the motor housing end. Can be prevented. That is, the magnet can be firmly fixed to the motor housing, and a small motor excellent in impact resistance can be obtained.

また請求項２に記載の発明によれば、モータハウジングの同心位置に、円筒状磁石を配置する固定構造として、磁石収納部をモータハウジング内径面の一部、つまりモータハウジングの小径部側円筒部に前記磁石固定面として形成することにより、前記円筒状磁石の外形外周部と前記モータハウジングの小径部側円筒部内径の磁石固定面とで嵌合固定することができる。よってモータハウジングに対して、磁石を中心位置に固定するスリーブなどの固定部材を別個に備える必要がなくなる。そのため、円筒状磁石の外径寸法を小さくした場合であっても、同時に内径側寸法も小さくできるので、表面磁束密度を実質低下させることがなく、小型モータの出力も低下させずに、モータの特性を維持又は向上させるという効果がある。また同時に、磁石を中心位置に固定するスリーブなどの固定部材を別個に備える必要がなくなるので、部品点を削減することができる。   According to the second aspect of the present invention, as a fixed structure in which the cylindrical magnet is arranged at the concentric position of the motor housing, the magnet housing portion is a part of the inner diameter surface of the motor housing, that is, the small diameter side cylindrical portion of the motor housing. By forming it as the magnet fixing surface, the outer peripheral portion of the cylindrical magnet and the magnet fixing surface of the small diameter side cylindrical portion inner diameter of the motor housing can be fitted and fixed. Therefore, it is not necessary to separately provide a fixing member such as a sleeve for fixing the magnet at the center position with respect to the motor housing. Therefore, even when the outer diameter of the cylindrical magnet is reduced, the inner diameter can be reduced at the same time, so that the surface magnetic flux density is not substantially reduced and the output of the small motor is not reduced. There is an effect of maintaining or improving the characteristics. At the same time, it is not necessary to separately provide a fixing member such as a sleeve for fixing the magnet at the center position, so that the number of parts can be reduced.

また請求項３に記載の発明によれば、前記モータハウジングの磁石収納部が、前記小径部側端部内径の軸受収納部と異なる内径寸法位置に配置されることにより、モータハウジング内径に対し、磁石と軸受とがそれぞれ個別に安定して固定配置することができる。   According to the invention described in claim 3, the magnet housing portion of the motor housing is disposed at a position of an inner diameter different from the bearing housing portion of the inner diameter of the small diameter portion side end portion. The magnet and the bearing can be stably fixed and arranged individually.

また請求項４に記載の発明によれば、回転軸に偏心分銅が取り付けられた小型モータとして使用条件の厳しい状態の振動モータであっても、モータハウジングに対し磁石を強固に、かつ安定して固定配置することができ、耐衝撃性において、前記と同様な効果を奏する。   Further, according to the invention described in claim 4, even in a vibration motor having a severe use condition as a small motor having an eccentric weight attached to the rotating shaft, the magnet is firmly and stably attached to the motor housing. It can be fixedly arranged and has the same effect as described above in impact resistance.

例えば、落下等の衝撃により、偏心分銅を備えた回転軸に対し、スラスト方向により大きな力が発生した場合、モータハウジングに形成された磁石収納部の磁石止面が、偏心分銅を取り付けた回転軸に押されて、スラスト方向磁石側から軸受方向に対して、強い力が加えられたとしても、磁石の移動及びズレを防ぐことができる。   For example, when a large force is generated in the thrust direction against a rotating shaft equipped with an eccentric weight due to an impact such as dropping, the magnet retaining surface of the magnet housing portion formed in the motor housing is a rotating shaft with an eccentric weight attached. Even if a strong force is applied to the bearing direction from the thrust direction magnet side, the movement and displacement of the magnet can be prevented.

以下、本発明に係る実施形態の構成を、図１〜図３を参照しながら説明する。この実施形態では、小型モータの一形態として、回転軸に偏心分銅を備えたコアレスタイプの円筒型振動モータを例にとって説明する。   The configuration of the embodiment according to the present invention will be described below with reference to FIGS. In this embodiment, a coreless type cylindrical vibration motor having an eccentric weight on a rotating shaft will be described as an example of a small motor.

図１に、本発明の最良の実施形態の一例を概略断面図で示す。図に示すように、小型モータ1の本体は、一端部が開口されるとともに、他端部が前記一端部開口径より小径に段階を経て開口された小径部を有して略円筒形状に形成されたモータハウジング3で構成される。このモータハウジング3には、図２に詳細を示すように、図１の小型モータ1の駆動機構の大半を収納するハウジング本体部31が備えられ、このハウジング本体部31の一端側は図のように大きく開口状態に形成されている。またハウジング本体部31の他端側には、前記ハウジング本体部31よりも一段小径な磁石収納部32が設けられ、この磁石収納部32の端部側には、段差となる磁石止面32bが形成されている。また磁石収納部32の端部先端側には、前記磁石収納部32よりもさらに一段小径で開口するように形成された軸受嵌合部33が設けられている。このように、モータハウジング3の小径部側端部は、図に示す形状で段階的に径方向の段差が設けられている。   FIG. 1 is a schematic sectional view showing an example of the best embodiment of the present invention. As shown in the figure, the main body of the small motor 1 is formed in a substantially cylindrical shape with one end portion opened and the other end portion having a small-diameter portion opened through a diameter smaller than the one-end opening diameter. The motor housing 3 is made up of. As shown in detail in FIG. 2, the motor housing 3 is provided with a housing main body 31 that houses most of the drive mechanism of the small motor 1 of FIG. 1, and one end side of the housing main body 31 is as shown in the figure. It is formed in a large open state. Further, the other end side of the housing main body 31 is provided with a magnet storage portion 32 that is one step smaller in diameter than the housing main body portion 31. On the end portion side of the magnet storage portion 32, a magnet stop surface 32b serving as a step is provided. Is formed. In addition, a bearing fitting portion 33 formed so as to open with a smaller diameter than the magnet housing portion 32 is provided on the tip end side of the magnet housing portion 32. As described above, the end portion on the small diameter side of the motor housing 3 is provided with a step in the radial direction step by step in the shape shown in the drawing.

さらに前記磁石収納部32の内径側には、図３で示すように、モータハウジング3の内部で磁界を発生させる円筒状磁石5の一端が収納されている。この円筒状磁石5の一端は、前記磁石止面32bと当接するように配置されており、当接によって、円筒状磁石5は、軸受嵌合部33方向にこれ以上移動できない構造となっている。   Further, as shown in FIG. 3, one end of a cylindrical magnet 5 that generates a magnetic field inside the motor housing 3 is housed on the inner diameter side of the magnet housing portion 32. One end of the cylindrical magnet 5 is disposed so as to contact the magnet stop surface 32b, and the cylindrical magnet 5 cannot move further in the direction of the bearing fitting portion 33 by the contact. .

また同時に、円筒状磁石5の一端外周面は、前記磁石収納部32の内周面（図２又は図３参照）である磁石固定面32a周縁で嵌合し、接着剤40により固着される。これにより円筒状磁石5は、円筒状磁石5の中心軸がモータハウジング3の中心軸と同一軸上の配置位置になるように、モータハウジング3側に固定される。   At the same time, the outer peripheral surface of one end of the cylindrical magnet 5 is fitted on the periphery of the magnet fixing surface 32a, which is the inner peripheral surface (see FIG. 2 or FIG. 3) of the magnet housing portion 32, and is fixed by the adhesive 40. Thereby, the cylindrical magnet 5 is fixed to the motor housing 3 side so that the central axis of the cylindrical magnet 5 is located on the same axis as the central axis of the motor housing 3.

一方、これに対し前記軸受収納部33には、出力軸フロント側に位置する軸受6が、前記円筒状磁石5の一端面と実質的に非接触となるように装着されている。図１に示すように、円筒状磁石5の中心孔の内部には、ロータ部の中心軸となる回転軸2が貫通し、前記フロント側軸受6及びリア側軸受7によりロータを回転自在に軸支している。リア側の軸受7は、前記ハウジング本体部31の開口側に取り付けられる蓋体形状のエンドキャップ4の貫通孔4aに装着される。   On the other hand, the bearing housing 33 is mounted with a bearing 6 located on the output shaft front side so as to be substantially non-contact with one end face of the cylindrical magnet 5. As shown in FIG. 1, a rotation shaft 2 that serves as a central axis of the rotor portion passes through the center hole of the cylindrical magnet 5, and the rotor can be freely rotated by the front side bearing 6 and the rear side bearing 7. I support. The rear-side bearing 7 is mounted in the through hole 4a of the lid-shaped end cap 4 attached to the opening side of the housing main body 31.

回転軸2の一部には、回転軸2と同一軸上に、整流子11をモールドした樹脂成形材からなるコイルホルダ10を用いて、円筒状磁石5の外周面とハウジング本体31内周面の間で、エアギャップを介して対向する位置に巻線コイル8が配置され、カップ状のロータ部を構成している。   A part of the rotating shaft 2 includes a coil holder 10 made of a resin molding material in which a commutator 11 is molded on the same axis as the rotating shaft 2, and the outer peripheral surface of the cylindrical magnet 5 and the inner peripheral surface of the housing body 31. Between them, the winding coil 8 is arranged at a position facing through the air gap to constitute a cup-shaped rotor portion.

一方、前述のエンドキャップ4には、前記整流子11に外部からの電流を供給するブラシ9が装着固定されており、このブラシ9には、図示しない給電端子を経て、電流が供給される。   On the other hand, a brush 9 for supplying current from the outside to the commutator 11 is attached and fixed to the end cap 4 described above, and current is supplied to the brush 9 via a power supply terminal (not shown).

また、この小型モータ1では、モータハウジング3の外方の出力軸となる回転軸2の一端に、タングステン等の高比重焼結合金から形成された半円柱状の偏心分銅12が取り付けられ、いわゆる振動モータとして動作する構造を有している。この振動モータは、回転軸2で偏心分銅12を回転駆動させることにより、偏重心位置が振れ回る力が発生し、モータ全体が振動する。   Further, in this small motor 1, a semi-cylindrical eccentric weight 12 formed of a high specific gravity sintered alloy such as tungsten is attached to one end of a rotating shaft 2 which is an outer output shaft of the motor housing 3, so-called It has a structure that operates as a vibration motor. In this vibration motor, when the eccentric weight 12 is rotationally driven by the rotary shaft 2, a force that causes the eccentric gravity center position to swing is generated, and the entire motor vibrates.

次に、本実施の形態における作用効果について説明する。
例えば、偏心分銅12が取り付けられた小型モータ1（振動モータ）を携帯電話機に搭載した場合は、着信モード選択により、小型モータ1が動作し、偏心分銅12が高速回転して携帯電話機に振動が加えられることを利用して、携帯電話機の使用者に体感振動による着信を告知する。また同様にゲーム機のコントローラや腕時計型目覚まし時計等に、上記小型モータ1を搭載した場合であっても、振動体感発生装置として機能する。 Next, the function and effect of this embodiment will be described.
For example, when a small motor 1 (vibration motor) with an eccentric weight 12 attached is mounted on a mobile phone, the small motor 1 operates by selecting the incoming mode, and the eccentric weight 12 rotates at high speed, causing vibration to the mobile phone. Utilizing what is added, the mobile phone user is notified of an incoming call due to vibration. Similarly, even when the small motor 1 is mounted on a controller of a game machine, a wristwatch type alarm clock, or the like, it functions as a vibration sensation generating device.

ところが、これらの携帯電話機または前記振動モータを搭載した装置類は、人が手で持って使用するものなので、誤って落下させてしまうことも考えられる。例えば、振動発生装置としての小型モータ1を搭載した携帯電話機が、たまたま偏心分銅12の側から地面等に落下した際には、スラスト方向に強い衝撃力が加わる。この時、比重の大きい偏心分銅12を取り付けた回転軸2に当然ながら強いスラスト方向の力が加わり、一体のロータ部全体が円筒状磁石5に接するライナー20（図１参照）を強く押すこととなる。よって円筒状磁石5は、フロント側の軸受6側のスラスト方向に移動するような力が瞬間的に加えられることになる。   However, since these mobile phones or devices equipped with the vibration motor are used by a person with their hands, they may be dropped by mistake. For example, when a mobile phone equipped with a small motor 1 serving as a vibration generator happens to fall from the eccentric weight 12 side to the ground or the like, a strong impact force is applied in the thrust direction. At this time, as a matter of course, a strong thrust force is applied to the rotary shaft 2 to which the eccentric weight 12 having a large specific gravity is attached, and the entire rotor portion strongly presses the liner 20 (see FIG. 1) contacting the cylindrical magnet 5. Become. Accordingly, the cylindrical magnet 5 is momentarily applied with a force that moves in the thrust direction on the front bearing 6 side.

しかし、円筒状磁石5は、その一端面を磁石止面32bにより、磁石収納部32の先端側、つまり軸受6側スラスト方向への移動を制限され、また一方軸受6は、円筒状磁石5の一端面と非接触となるように、軸受収納部33に装着されるので、上記落下事故の際であっても、円筒状磁石5に生じた上記強い力を磁石止面32bで受けることができる。よって、軸受嵌合部33に配置した軸受6は、上記落下によるモータ全体への衝撃力を受けたとしても、円筒状磁石5からは直接、スラスト方向への強い力を加えられることはない。   However, the cylindrical magnet 5 has its one end face restricted by the magnet stop surface 32b so that movement in the tip end side of the magnet storage portion 32, that is, the bearing 6 side thrust direction, and the one bearing 6 of the cylindrical magnet 5 Since it is mounted on the bearing housing portion 33 so as to be in non-contact with the one end surface, the strong force generated in the cylindrical magnet 5 can be received by the magnet stop surface 32b even in the case of the fall accident. . Therefore, the bearing 6 arranged in the bearing fitting portion 33 is not directly applied with a strong force in the thrust direction from the cylindrical magnet 5 even if it receives an impact force on the entire motor due to the dropping.

また同時に、円筒状磁石5は、その一端の円筒外周面でモータハウジング3の磁石固定面32aと嵌合し、モータハウジング3の中心軸と同一軸上の位置になるように接着固定されているので、円筒状磁石5の中心孔に固定用のスリーブを配置する必要がなくなる。   At the same time, the cylindrical magnet 5 is fitted and fixed to a position on the same axis as the central axis of the motor housing 3 by fitting with the magnet fixing surface 32a of the motor housing 3 at the cylindrical outer peripheral surface of one end thereof. Therefore, it is not necessary to arrange a fixing sleeve in the center hole of the cylindrical magnet 5.

このよに、本実施の形態によれば、円筒状磁石5のスラスト方向軸受6側への移動を磁石止面32bにより制限し、さらに、軸受6を円筒状磁石5の一端面と常に非接触となるように軸受収納部33に装着することで、落下衝撃などにより、軸受6が軸受収納部33の開口部から外れてしまう原因の一つであった円筒状磁石5から軸受6方向に加えられる力を防ぐことができる。このため、落下衝撃に強い、信頼性の高い偏心分銅を取り付けた小型モータを提供することができる。   Thus, according to the present embodiment, the movement of the cylindrical magnet 5 toward the thrust direction bearing 6 is limited by the magnet stop surface 32b, and the bearing 6 is not always in contact with one end surface of the cylindrical magnet 5. By attaching it to the bearing housing 33 so that the bearing 6 is removed from the opening of the bearing housing 33 due to a drop impact or the like, it is added in the direction from the cylindrical magnet 5 to the bearing 6 direction. Can be prevented. Therefore, it is possible to provide a small motor with a highly reliable eccentric weight that is resistant to drop impact.

また、小型モータ1は、前述の従来のスリーブを備える必要がない構成となっているので、スリーブを備える小型モータよりもモータハウジングの径寸法を小さく設計することができる。また、同様に前記スリーブを備える必要がない構成となっているので、部品点数を削減できるのは勿論、小型モータ1の外径寸法を変更せずに、スリーブが配置されていた領域分だけ円筒状磁石5の内径寸法を小さく設定し、表面磁束密度が大きくなるように円筒の厚みを増し、体積の大きな円筒状磁石5を適用することができ、高出力の小型モータを設計することができるという効果がある。   Further, since the small motor 1 is configured not to include the above-described conventional sleeve, the diameter of the motor housing can be designed to be smaller than that of the small motor including the sleeve. Similarly, since it is not necessary to provide the sleeve, the number of parts can be reduced and, of course, the outer diameter of the small motor 1 can be reduced without changing the outer diameter of the small motor 1. The inner diameter of the magnet 5 is set small, the thickness of the cylinder is increased so that the surface magnetic flux density is increased, and the cylindrical magnet 5 having a large volume can be applied, and a high-power small motor can be designed. There is an effect.

主に、振動機能が必要とされる携帯電話を始めとする多機能型携帯電話、腕時計型ＰＨＳ、構内型小型無線通信機などのモバイル通信機器、及び携帯型のＰＤＡ等の各種情報通信端末機器、及び体感振動を伴うゲーム機コントローラや、ポケットゲーム機などの電子玩具を含む電子機器全般に搭載される。   Mainly mobile communication devices such as multi-function mobile phones such as mobile phones that require vibration functions, wristwatch-type PHS, on-site small wireless communication devices, and various information communication terminal devices such as portable PDAs , And game machine controllers with body vibration, and electronic devices including electronic toys such as pocket game machines.

本発明に係る小型モータを示した断面図である。It is sectional drawing which showed the small motor based on this invention. 本発明に係る小型モータのモータハウジング部分を示した断面図である。It is sectional drawing which showed the motor housing part of the small motor based on this invention. 本発明に係る小型モータのモータハウジングと、軸受及び円筒状磁石の配置を示した断面図である。It is sectional drawing which showed arrangement | positioning of the motor housing of the small motor based on this invention, a bearing, and a cylindrical magnet.

符号の説明Explanation of symbols

1 小型モータ
2 回転軸
3 モータハウジング
31 ハウジング本体部
32 磁石収納部
32a 磁石固定面
32b 磁石止面
33 軸受収納部
4 エンドキャップ
40 接着剤
5 円筒状磁石
6 軸受
7 軸受
8 巻線コイル
9 ブラシ部
10 コイルホルダ
11 整流子
12 偏心分銅
1 Small motor
2 Rotating axis
3 Motor housing
31 Housing body
32 Magnet compartment
32a Magnet fixing surface
32b Magnet stop surface
33 Bearing housing
4 End cap
40 Adhesive
5 Cylindrical magnet
6 Bearing
7 Bearing
8-winding coil
9 Brush part
10 Coil holder
11 Commutator
12 Eccentric weight

Claims (4)

ステータ部として、
一端部が開口されるとともに、他端部が前記一端部開口径より小径に開口された小径部を有するモータハウジングと、
前記モータハウジングの少なくとも小径部側端部内径に収納され、ロータ部中心の回転軸を軸支する軸受と、
前記モータハウジング内に位置し磁界を発生させる磁石と、
前記モータハウジングの前記小径部側端部近傍の内径で、前記磁石を保持固定する磁石収納部と、
を備えてなる小型モータにおいて、
前記磁石収納部の一部に、前記回転軸と直交する段差が形成されるとともに、
前記段差には、前記磁石が回転軸スラスト方向で当接することにより、前記軸受に対して、前記磁石を回転軸スラスト方向で非接触位置に保持する磁石止面を備えている
ことを特徴とする小型モータ。 As a stator part,
A motor housing having a small-diameter portion having an opening at one end and an opening at the other end smaller than the opening diameter at the one-end;
A bearing that is housed in at least the small-diameter-side end inner diameter of the motor housing and that supports the rotation shaft at the center of the rotor portion;
A magnet located within the motor housing to generate a magnetic field;
A magnet housing portion for holding and fixing the magnet at an inner diameter in the vicinity of the small diameter side end of the motor housing;
In a small motor comprising
A step perpendicular to the rotation axis is formed in a part of the magnet housing part,
The step is provided with a magnet stop surface that holds the magnet in a non-contact position in the rotation axis thrust direction with respect to the bearing when the magnet abuts in the rotation axis thrust direction. Small motor. 前記磁石収納部の径方向の一部に、前記磁石の外形外周面と当接して、前記磁石をモータハウジングの同心位置に保持固定する磁石固定面を備えている
ことを特徴とする請求項１に記載の小型モータ。 2. A magnet fixing surface for holding and fixing the magnet at a concentric position of the motor housing in contact with an outer peripheral surface of the magnet at a part in a radial direction of the magnet housing portion. Small motor described in 1. 前記モータハウジングの磁石収納部が、前記小径部側端部内径の軸受収納部と異なる内径寸法位置に配置されたことを特徴とする請求項１又は請求項２に記載の小型モータ。   3. The small motor according to claim 1, wherein the magnet housing portion of the motor housing is disposed at a position of an inner diameter different from the bearing housing portion of the inner diameter of the small diameter portion side end portion. 前記ロータ部回転軸の一端に、偏心分銅が取り付けられている
ことを特徴とする請求項１〜請求項３に記載の小型モータ。
The small motor according to claim 1, wherein an eccentric weight is attached to one end of the rotor portion rotation shaft.
JP2003348297A 2003-10-07 2003-10-07 Small motor Expired - Fee Related JP4748429B2 (en)

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PCT/JP2004/013431 WO2005036714A1 (en) 2003-10-07 2004-09-15 Miniature motor
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CN106375582A (en) * 2016-09-06 2017-02-01 广东欧珀移动通信有限公司 Vibration control method and apparatus

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JP2002223543A (en) * 2001-01-26 2002-08-09 Mitsuba Corp Housing structure of motor

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JP2003189531A (en) * 2001-12-11 2003-07-04 Asmo Co Ltd Dynamo-electric machine and its manufacturing method
JP4159441B2 (en) * 2003-10-06 2008-10-01 三洋電機株式会社 Small motor

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JP2001009372A (en) * 1999-06-29 2001-01-16 Shicoh Eng Co Ltd Cylindrical micro vibration motor
JP2002223543A (en) * 2001-01-26 2002-08-09 Mitsuba Corp Housing structure of motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7598639B2 (en) 2005-09-16 2009-10-06 Samsung Electro-Mechanics Co., Ltd. Vibration motor provided with a thin blocking body of a communtator's breakaway
CN106375582A (en) * 2016-09-06 2017-02-01 广东欧珀移动通信有限公司 Vibration control method and apparatus
CN106375582B (en) * 2016-09-06 2019-05-24 Oppo广东移动通信有限公司 Vibration control method and device

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