JPS61106053A - Brushless motor - Google Patents

Brushless motor

Info

Publication number
JPS61106053A
JPS61106053A JP59228312A JP22831284A JPS61106053A JP S61106053 A JPS61106053 A JP S61106053A JP 59228312 A JP59228312 A JP 59228312A JP 22831284 A JP22831284 A JP 22831284A JP S61106053 A JPS61106053 A JP S61106053A
Authority
JP
Japan
Prior art keywords
rotor
coils
brushless motor
drive
drive coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59228312A
Other languages
Japanese (ja)
Inventor
Takeshi Osaki
大崎　武司
Yoshihisa Takahashi
高橋　良久
Noriaki Kitani
木谷　範昭
Hitoshi Yokomizo
横溝　仁志
Nobusuke Sasahara
笹原　伸亮
Nobuyoshi Amao
天尾　信義
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Kumagaya Seimitsu Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Kumagaya Seimitsu Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd, Kumagaya Seimitsu Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP59228312A priority Critical patent/JPS61106053A/en
Publication of JPS61106053A publication Critical patent/JPS61106053A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
    • H02K11/014—Shields associated with stationary parts, e.g. stator cores
    • H02K11/0141—Shields associated with casings, enclosures or brackets

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Brushless Motors (AREA)
  • Windings For Motors And Generators (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

PURPOSE:To obtain the smooth rotation of a rotor by interposing a shielding layer formed by spirally winding densely leads between a plurality of drive coils disposed on a printed board and the rotor. CONSTITUTION:A stator yoke 1 is mounted in a housing 8, and a printed board 3 for a drive circuit in which a plurality of drive coils 2 are mounted is superposed on the yoke. A rotor 5 has an annular magnet 4, which is opposed through a slight interval to the coils 2, and its rotational shaft 6 is rotatably supported. In this case, a shielding layer 9 of a thin copper plate is superposed on the coils 2 between the coils 2 and the rotor 5. The 9 if formed by spirally winding densely insulated leads 10 of circular section in a flat plate shape, and connected with an earth. Thus, the coils 2 and the rotor 5 are shielded therebetween to suppress noises.

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明はブラシレスモータに係り、特に８　ｍ／ｍビデ
オ等に好適するブラシレスモータの改良に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a brushless motor, and particularly to an improvement of a brushless motor suitable for 8 m/m video and the like.

（ロ）　従来の技術 従来、ブラシレスモータを８　ｍ／ｍビデオのヘッドの
回転に用いる場合には、第４図に・示すような、ｍ成が
ある。(b) Prior Art Conventionally, when a brushless motor is used to rotate an 8 m/m video head, there are m configurations as shown in FIG.

すなわち、ステータヨーク（１）の一方の主面に、複数
の駆動コイル（２）を取付けたプリント基板（３）を重
ね、リング状のマグネットく４）を有するロータく５〉
をその駆動コイル（２）と間隔をおいて対向するように
回転自在に支持許せ、回転軸（６）の先端に回転ヘッド
（７）を取付けてなるものである。なお、符号〈８月よ
、回転＠（６ンを軸支するとともにブラシレスモータを
機器のシャーシに取つけるハウジングである。That is, a printed circuit board (3) on which a plurality of drive coils (2) are attached is stacked on one main surface of a stator yoke (1), and a rotor (5) having a ring-shaped magnet (4) is formed.
The rotating head (7) is attached to the tip of the rotating shaft (6), and the rotating head (7) is rotatably supported so as to face the drive coil (2) at a distance. Furthermore, the symbol 〈Aug.

このように用いられるブラシレスモータは、各駆動コイ
ルく２）を切り換え駆動することによってロータ（５）
が回転し、回転軸（６）の先端に取付けられた回転ヘッ
ド（７）を回転きせる。The brushless motor used in this way drives the rotor (5) by switching and driving each drive coil (2).
rotates, causing the rotary head (7) attached to the tip of the rotary shaft (6) to rotate.

し；”’　Ｌ／　、このようなブラシレスモータは、ロ
ータ（５）を回転きせるために複数の駆動コイル（２）
をデジタル的に切り換えるのが一般的であるので、駆動
コイル（２）にはこの切り換え時に急峻なパルス信号が
発生し易い。;"' L/ Such a brushless motor uses a plurality of drive coils (2) to rotate the rotor (5).
Since it is common to switch digitally, a steep pulse signal is likely to be generated in the drive coil (2) at the time of this switching.

そして、この急峻なパルス信号は、駆動コイル（２）と
対向するロータ（５）にも誘起され易く、これがノイズ
の原因となる。特に、８　ｍ／ｍビデオの回転へラド（
７）の回転に用いる場合には、回転軸（６）を介して誘
起信号が静電的に回転へラド（７）に伝わり、録画／再
生時のノイズのＷ、因となって８　ｍ／ｍビデオの品位
を低下きせる。This steep pulse signal is also likely to be induced in the rotor (5) facing the drive coil (2), which causes noise. In particular, the rotation of 8 m/m video (
7), the induced signal is electrostatically transmitted to the rotating rod (7) via the rotating shaft (6), causing noise W during recording/playback to be 8 m/ Degrades the quality of m-video.

さらに、パルス信号のレベルが大きい場合には、ロータ
（５）や回転ヘッド（７）と外部間で放電現象を起こし
やすくなって安全性の面からも好ましくない。Furthermore, if the level of the pulse signal is high, a discharge phenomenon is likely to occur between the rotor (5) or the rotary head (7) and the outside, which is undesirable from the standpoint of safety.

（ハ）発明が解決しようとする問題点 本発明はこのような従来の欠点を解決するためになされ
たもので、駆動コイルの切り換え駆動時にロータへの急
峻なパルス信号の誘起を抑え、ロータの円滑な回転を確
保できるブラシレスモータの提供を目的とする。(c) Problems to be Solved by the Invention The present invention has been made to solve these conventional drawbacks. The purpose is to provide a brushless motor that can ensure smooth rotation.

（ニ）問題点を解決するための手段 この問題点を解決するために本発明は、ステータヨーク
上に重ねたプリント基板に複数の駆動コイルを配置し、
マグネットを有するロータを前記駆動コイルに対向させ
るようにして回転自在に支持させてなるブラシレスモー
タにおいて、前記駆動コイルと前記ロータの間に、導線
をスパイラル状に密巻きしてなるシールド層を介在した
ものである。(d) Means for solving the problem In order to solve this problem, the present invention arranges a plurality of drive coils on a printed circuit board stacked on the stator yoke,
A brushless motor comprising a rotor having a magnet and rotatably supported so as to face the drive coil, wherein a shield layer made of a conductive wire tightly wound in a spiral is interposed between the drive coil and the rotor. It is something.

（ホ）作用 このような本発明の手段によれば、駆動コイルとロータ
間において、駆動コイルの切り換え駆動時に生ずる急峻
なパルス信号がシールド層によってシールドされる一方
、シールド層にあってもロータのマグネットによろうず
電流の発生が抑えられる。(e) Effect: According to the means of the present invention, the steep pulse signal generated between the drive coil and the rotor during switching drive of the drive coil is shielded by the shield layer, while the shield layer also prevents the rotor from moving. The magnet suppresses the generation of wax current.

くべ）実施例 以下本発明の詳細な説明する。なお、従来例と共通する
部分には同一の符号を付す。Example) The present invention will be explained in detail below. Note that parts common to the conventional example are given the same reference numerals.

第１図は本発明のブラシレスモータの一実施例を示す半
断面図であり、便宜上、８　ｍ／ｍビデオに応用する場
合で示す。FIG. 1 is a half-sectional view showing one embodiment of the brushless motor of the present invention, and for convenience, the brushless motor is shown in the case where it is applied to an 8 m/m video.

図において、ハウジング〈８）にはステータヨーク（１
）が取つけられており、ステータヨーク（１）の上には
複数の駆動コイル（２）を環状に取付けた駆動回路用の
プリント基板（３）が重ねられている。In the figure, the stator yoke (1) is attached to the housing (8).
) is attached, and a printed circuit board (3) for a drive circuit on which a plurality of drive coils (2) are attached in a ring shape is stacked on top of the stator yoke (1).

ロータ（５）は、環状のマグネット（４）を有し、この
マグネット（４）を駆動コイル（２）と僅がな間隔をお
いて対向するようにして配置されるとともに、ハウジン
グ（８）に回転自在に軸支された回転軸（６）に支持き
れている。The rotor (5) has an annular magnet (4), which is disposed so as to face the drive coil (2) with a small distance therebetween, and is attached to the housing (8). It is fully supported by a rotating shaft (6) which is rotatably supported.

駆動コイルく２）とロータ（５）の間において、駆動コ
イル（２〉上には薄鋸板製のシールドｉ（９）が重ねら
れている。このシールドＪｌ（９）は、第２図および第
３図に示すように、断面円形の絶縁導線（１０）、例え
ばポリウレタン導線をスパイラル状に密巻きして偏平な
板状になっており、ステータヨーク（１）もしくはアー
スに接続されている。Between the drive coil (2) and the rotor (5), a thin sawn board shield i (9) is superimposed on the drive coil (2). As shown in FIG. 3, an insulated conductive wire (10) having a circular cross section, such as a polyurethane conductive wire, is tightly wound in a spiral shape to form a flat plate shape, and is connected to the stator yoke (1) or ground.

そして、ハウジング（８）から突出する回転軸（６ンの
先端には、回転ヘッドく７）が取付けられている。A rotary shaft (rotary head 7) is attached to the tip of the rotary shaft (6) protruding from the housing (8).

（ト〉　発明の効果 このようなブラシレスモータは、複数の駆動ロイルく２
）を切り換え駆動することによってロータ（５）が回転
する。この場合、駆動コイル（２）とロータ（５）間は
シールド層（９）によってシールドされるから、駆動コ
イル（２）の切り換え駆動に伴って生じる急峻なパルス
信号は、ロータ（５〉に誘起されにくくなる。(G) Effect of the invention Such a brushless motor has a plurality of drive coils and two
) is switched and driven to rotate the rotor (5). In this case, since the distance between the drive coil (2) and the rotor (5) is shielded by the shield layer (9), the steep pulse signal generated by switching drive of the drive coil (2) is induced in the rotor (5>). become less likely to be

そのため、例えば８　ｍ／ｍビデオの回転ヘラド（７）
の回転に用いても、回転ヘッド（７）部分にもそれが伝
達されにくいので、ノイズの発生を抑えることができる
。Therefore, for example, an 8 m/m video rotating helad (7)
Even if the rotary head (7) is used for rotation, the noise is not easily transmitted to the rotary head (7) portion, so generation of noise can be suppressed.

さらに、マグネット（４）が回転するので導体にはうず
電流が発生し易いが、シールド層（９）が１枚の板状で
はなく導線り１０）をスパイラル状に巻い−たものであ
るから、うず電流が生じにくく、ロータく５）の円滑な
回転を確保できる。Furthermore, since the magnet (4) rotates, eddy currents are likely to occur in the conductor, but since the shield layer (9) is not a single plate but a spirally wound conductor wire (10), Eddy currents are less likely to occur and smooth rotation of the rotor 5) can be ensured.

なお、上述した実施例において、シールド層（９）を形
成する導線（１０）として断面角形のものを用いれば巻
線が容易となるうえ急峻なパルス信号のシールド効果を
より高めることができる。また、必ずしも絶縁導線であ
る必要はない。In the above-described embodiment, if a conductive wire (10) having a rectangular cross section is used to form the shield layer (9), winding becomes easier and the shielding effect against steep pulse signals can be further enhanced. Further, it does not necessarily have to be an insulated conductor.

さらに、本発明は８　ｍ／ｍビデオ以外にも広く応用可
能である。Furthermore, the present invention is widely applicable to more than 8 m/m video.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明に係るブラシレスモータの一実施例を示
す中断正面図、第２図および第３図は第１図のシールド
層の斜視図および断面図、第４図は従来のブラシレスモ
ータを示す生新正面図である。 （１）・・・ステータヨーク、（２）・・・駆動コイル
、〈３）・・・プリント基板、（４）・・・マグネット
、〈５）・・・ロータ、（６）・・・回転軸、（７）・
・・回転ヘッド、（９）・・・シールド層、（１０）・
・・導線。FIG. 1 is an interrupted front view showing one embodiment of a brushless motor according to the present invention, FIGS. 2 and 3 are perspective views and cross-sectional views of the shield layer of FIG. 1, and FIG. 4 is a diagram showing a conventional brushless motor. FIG. (1)...Stator yoke, (2)...Drive coil, <3)...Printed circuit board, (4)...Magnet, <5)...Rotor, (6)...Rotation Axis, (7)・
・Rotating head, (9) ・Shield layer, (10)・
・Conducting wire.

Claims (3)

【特許請求の範囲】[Claims] （１）ステータヨーク上に重ねたプリント基板に複数の
駆動コイルを取付け、 マグネットを有するロータを前記駆動コイルに対向させ
るとともに回転自在に支持させてなるブラシレスモータ
において、 前記駆動コイルと前記ロータの間に、導線をスパイラル
状に密巻きしてなるシールド層が介在してなることを特
徴とするブラシレスモータ。(1) In a brushless motor in which a plurality of drive coils are attached to a printed circuit board stacked on a stator yoke, and a rotor having a magnet is opposed to and rotatably supported by the drive coil, between the drive coil and the rotor. A brushless motor is characterized in that a shield layer made of conductive wires tightly wound in a spiral is interposed therebetween. （２）前記シールド層が、断面円形の導線からなる特許
請求の範囲第１項記載のブラシレスモータ。(2) The brushless motor according to claim 1, wherein the shield layer is made of a conductive wire having a circular cross section. （３）前記シールド層が、断面角形の導線からなる特許
請求の範囲第１項記載のブラシレスモータ。(3) The brushless motor according to claim 1, wherein the shield layer is made of a conductive wire having a rectangular cross section.
JP59228312A 1984-10-30 1984-10-30 Brushless motor Pending JPS61106053A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59228312A JPS61106053A (en) 1984-10-30 1984-10-30 Brushless motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59228312A JPS61106053A (en) 1984-10-30 1984-10-30 Brushless motor

Publications (1)

Publication Number Publication Date
JPS61106053A true JPS61106053A (en) 1986-05-24

Family

ID=16874465

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59228312A Pending JPS61106053A (en) 1984-10-30 1984-10-30 Brushless motor

Country Status (1)

Country Link
JP (1) JPS61106053A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1450464A4 (en) * 2001-11-29 2005-02-09 Yamaha Motor Co Ltd Axial gap type dynamo-electric machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5510825A (en) * 1978-07-05 1980-01-25 Matsushita Electric Ind Co Ltd Motor with frequency generator
JPS59147481A (en) * 1983-02-10 1984-08-23 ソニー株式会社 Circuit board for mounting stator for motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5510825A (en) * 1978-07-05 1980-01-25 Matsushita Electric Ind Co Ltd Motor with frequency generator
JPS59147481A (en) * 1983-02-10 1984-08-23 ソニー株式会社 Circuit board for mounting stator for motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1450464A4 (en) * 2001-11-29 2005-02-09 Yamaha Motor Co Ltd Axial gap type dynamo-electric machine
US7323799B2 (en) 2001-11-29 2008-01-29 Yamaha Hatsudoki Kabushiki Kaisha Axial gap type rotating electric machine

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