JPS61106057A - Brushless motor - Google Patents
Brushless motorInfo
- Publication number
- JPS61106057A JPS61106057A JP59228311A JP22831184A JPS61106057A JP S61106057 A JPS61106057 A JP S61106057A JP 59228311 A JP59228311 A JP 59228311A JP 22831184 A JP22831184 A JP 22831184A JP S61106057 A JPS61106057 A JP S61106057A
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- coil
- drive
- drive coil
- 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.)
- Pending
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
- H02K29/14—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with speed sensing devices
-
- 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
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Brushless Motors (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
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8m/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 more 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8m/mビデオに用いる場合
には、第4図に示すような構成がある。(B) Prior Art Conventionally, when a brushless motor is used for 8 m/m video, there is a configuration 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(4)を有するロータ(5)を
駆動コイル(2)と間隔をおいて対向するように回転自
在に軸支させ、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。That is, a printed circuit board (3) with a plurality of drive coils (2) attached is stacked on one main surface of a stator yoke (1), and a rotor (5) having a ring-shaped magnet (4) is attached to the drive coil (2). A rotary head (7) is rotatably supported at the tip of the rotary shaft (6) so as to face the
It is made by attaching.
なお、符号(8)は、回転軸(6)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りつけるハウジ
ングである。Note that the reference numeral (8) is a housing that supports the rotating shaft (6) and attaches the brushless motor to the chassis of the device.
このようなブラシレスモータは、各駆動コイル(2)を
切り換え駆動きせることによってロータ(5)が回転し
、ロータ(5〉の回転軸(6)の先端に取付けられた回
転ヘッドく7)が回転する。In such a brushless motor, the rotor (5) rotates by switching and driving each drive coil (2), and the rotating head 7 attached to the tip of the rotating shaft (6) of the rotor (5) rotates. do.
しかし、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駆WjJSI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
)の切り換え駆動時に急峻なパルス信号が発生し易く、
ノイズの原因となる。However, such a brushless motor has a rotor (5)
It is common to digitally switch the drive coil (2) to rotate the drive coil (2).
) A steep pulse signal is likely to occur when driving the switch.
It causes noise.
そして、この急峻なパルス信号はロータ(5)にも誘起
され易く、8m/mビデオに用いた場合、回転軸(6)
を介して回転ヘッド(7)に伝わって録画/再生時のノ
イズの原因となり、画像品位を低下きせる。This steep pulse signal is also easily induced in the rotor (5), and when used for 8m/m video, the rotation axis (6)
The noise is transmitted to the rotary head (7) through the recording/reproducing apparatus, causing noise during recording/playback, and degrading the image quality.
また、急峻な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
こし易くなって安全性の面からも問題がある。Further, if the level of the steep pulse signal is large, a discharge phenomenon is likely to occur between the rotor (5) or the rotary head (7) and the outside, which poses a safety problem.
さらに、ブラシレスモータにあっては、回転速度を制御
するために周波散発を機を備える場合が多く、周波数発
振コイルの配置に工夫が必要である。Furthermore, brushless motors are often equipped with frequency sporadic functions to control the rotational speed, and the arrangement of the frequency oscillation coils requires consideration.
(ハ)発明が解決しようとする問題点
本発明はこのような状況の下になされたもので、駆動コ
イルの切り換え駆動時に発生する急峻なパルス信号の影
響を抑え、かつ周波数発電機を備えたブラシレスモータ
の提供を目的とする。(c) Problems to be Solved by the Invention The present invention has been made under these circumstances, and is a method that suppresses the influence of steep pulse signals generated when switching and driving the drive coil, and is equipped with a frequency generator. The purpose is to provide brushless motors.
(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きせ
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、板状
のシールド部材を介在させるとともに、前記ロータの回
転に応じた周波数信号を出力する周波数発電コイルを前
記シールド部材に形成してなるものである。(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,
In the brushless motor, a rotor having a magnet is rotatably supported so as to face the drive coil, and a plate-shaped shield member is interposed between the drive coil and the rotor, and a plate-shaped shield member is interposed between the drive coil and the rotor. A frequency generating coil that outputs a corresponding frequency signal is formed on the shield member.
(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部材によってシールドされ、ま
たこのシールド部材に設けた周波数発電コイルにより、
ロータの回転に応じた周波数発電信号を得ることができ
る。(e) Effect: According to the means of the present invention, the steep pulse signal generated when switching the drive coil between the drive coil and the rotor is shielded by the shield member, and the frequency generating coil provided on the shield member According to
A frequency power generation signal corresponding to the rotation of the rotor can be obtained.
(へ)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。(f) Examples 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中
断正面図であり、便宜上、8m/mビデオに応用する場
合で示す。FIG. 1 is a cutaway front view showing one embodiment of the brushless motor of the present invention, and for convenience, the brushless motor is shown in a 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
)が取付けられており、ステータヨークく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
プリント基板く3)が重ねられている。In the figure, the housing (8) has a stator yoke (1
) is attached, and on top of the stator yoke 1) is a printed circuit board 3) for a drive circuit on which a plurality of drive coils 2 are attached in a ring shape.
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)と僅かな間隔をお
いて対向するように配置され、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 slight distance therebetween, and is rotatably mounted on the housing (8). It is fully supported by the supported rotating shaft (6).
駆動コイル(2)とロータ、(5)の間において、駆動
コイルく2)の上にはシールド部材(9)が重ねられて
いる。このシールド部材(9)は、第21Eおよび第3
図に示すように、絶縁板〈9a)に円形のシールド電極
部(10)と、このシールド電極部(10)の外周にジ
グザグ状の周波数発電コイル(11)を有している。A shield member (9) is placed on top of the drive coil (2) between the drive coil (2) and the rotor (5). This shield member (9) has the 21E and the 3rd
As shown in the figure, an insulating plate (9a) has a circular shield electrode part (10) and a zigzag-shaped frequency power generation coil (11) around the outer periphery of this shield electrode part (10).
なお、シールド電極部(10)および周波数発電コイル
ク11)はフレキシブル・プリント基板から形成すると
作業性がよい、また、シールド電極部(10)は、ステ
ータヨーク(1)もしくはアースに接続されている。It should be noted that the shield electrode part (10) and the frequency power generation coil 11) can be formed from a flexible printed circuit board for better workability, and the shield electrode part (10) is connected to the stator yoke (1) or the ground.
また、シールド電極部(10)には、ロータ(5〉の回
転軸を中心にして円弧状かつ同心状に形成された複数の
切込み(12)が形成されている。これらの切込み(1
2)の長さは、シールド電極部(10)にあって隣合う
切込み(12)に挾まれた円弧状の各帯状部(13)が
、ロータ(5)のマグネット(4)を磁極数2Pとした
場合に360°Xn/p(nはp以下の整数〉の個所で
短絡きれるように選定される0例えばマグネット(4)
の磁極数を6極とした場合、同心状の各帯状部(13)
が120°の位置で短絡されている。Further, a plurality of notches (12) are formed in the shield electrode portion (10) in an arcuate and concentric manner centered around the rotation axis of the rotor (5>.
2) The length is such that each arcuate strip (13) in the shield electrode part (10) sandwiched between adjacent notches (12) connects the magnet (4) of the rotor (5) to a magnetic pole number of 2P. For example, magnet (4) is selected so that it can be shorted at 360°Xn/p (n is an integer less than or equal to p).
When the number of magnetic poles is 6, each concentric strip (13)
is shorted at 120°.
このように、各帯状部(13)が120@の位置で短絡
されていると、各短絡部ではマグネット(4)の回転に
伴い発生するうずt流が各々同位相となって打ち消され
る。In this way, when each strip (13) is short-circuited at the 120@ position, the eddy currents generated as the magnet (4) rotates are in the same phase and canceled out at each short-circuit portion.
なお、シールド部材は切込み(12)を・設けたシール
ド電極部(10)を用いる代わりに、導線をスパイラル
状に密巻きしたものを、マグネット(4)に対向するよ
うに絶縁板に重ねて形成してもよい。In addition, instead of using the shield electrode part (10) provided with the notch (12), the shield member is formed by stacking a conductive wire tightly wound in a spiral shape on an insulating plate so as to face the magnet (4). You may.
そして、ロータ(5)の回転軸(6)の先端には、回転
ヘッド(7)が取付けられている。A rotating head (7) is attached to the tip of the rotating shaft (6) of the rotor (5).
(ト)発明の効果
このようなブラシレスモータは、駆動コイル(2)を切
り換え駆動することによってロータ(5)が回転するが
、駆動コイル(2)とロータ(5)間がシールドされる
ので、駆動コイルく2)の切り換え駆動に伴−)て生じ
る急峻なパルス信号がロータ(5)に誘起されにくくな
る。(G) Effects of the Invention In such a brushless motor, the rotor (5) rotates by switching and driving the drive coil (2), but since the space between the drive coil (2) and the rotor (5) is shielded, A steep pulse signal generated due to switching drive of the drive coil (2) is less likely to be induced in the rotor (5).
そのため、本発明によるブラシレスモータを8m/mビ
デオに用いた場合、例えばロータ(5)に取りつけた回
転へラド(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, when the brushless motor according to the present invention is used for an 8 m/m video, the noise is less likely to be transmitted to the rotary rotor (7) attached to the rotor (5), for example, so that the generation of noise can be suppressed.
きらに、ロータ(5)の回転に伴い、シールド部材(9
)に設けた周波数発電コイルからロータの回転に応じた
周波数発電信号が出力するので、これをサーボ回路に入
力すれば、ロータ(5)を回転制御できる。As the rotor (5) rotates, the shield member (9)
Since a frequency power generation signal corresponding to the rotation of the rotor is outputted from the frequency power generation coil provided in ), the rotation of the rotor (5) can be controlled by inputting this signal to the servo circuit.
きらに、本発明は8m/mビデオ以外にも広く応用可能
である。Moreover, the present invention is widely applicable to other than 8m/m video.
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
す生新正面図、第2図および第3図は第1図のシールド
部材の斜視図および断面図、第4図は従来のブラシレス
モータを示ず生新正面図である。
(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)・・・シールド部材、(10)・・シ
ールド電極部、(11)・・・周波数発電コイル。FIG. 1 is a new front view showing one embodiment of a brushless motor according to the present invention, FIGS. 2 and 3 are perspective views and sectional views of the shield member shown in FIG. 1, and FIG. 4 is a conventional brushless motor. It is a new front view without showing. (1)... Stator yoke, (2)... Drive coil,
(3)...Printed circuit board, (4)...Magnet, (
5) Rotor, (6) Rotating shaft, (7) Rotating head, (9) Shield member, (10) Shield electrode, (11) Frequency power generation coil.
Claims (1)
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、板状のシールド部
材を介在させるとともに、前記ロータの回転に応じた周
波数信号を出力する周波数発電コイルを前記シールド部
材に形成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 characterized in that a plate-shaped shield member is interposed therebetween, and a frequency power generation coil that outputs a frequency signal according to the rotation of the rotor is formed on the shield member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59228311A JPS61106057A (en) | 1984-10-30 | 1984-10-30 | Brushless motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59228311A JPS61106057A (en) | 1984-10-30 | 1984-10-30 | Brushless motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61106057A true JPS61106057A (en) | 1986-05-24 |
Family
ID=16874450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59228311A Pending JPS61106057A (en) | 1984-10-30 | 1984-10-30 | Brushless motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61106057A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62293959A (en) * | 1986-06-11 | 1987-12-21 | Tamagawa Seiki Co Ltd | Brushless dc motor |
WO2009071064A1 (en) * | 2007-12-05 | 2009-06-11 | Ina - Drives & Mechatronics Gmbh & Co. Ohg | Electric motor having partial surge protection and method for the production thereof |
Citations (1)
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 |
-
1984
- 1984-10-30 JP JP59228311A patent/JPS61106057A/en active Pending
Patent Citations (1)
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 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62293959A (en) * | 1986-06-11 | 1987-12-21 | Tamagawa Seiki Co Ltd | Brushless dc motor |
WO2009071064A1 (en) * | 2007-12-05 | 2009-06-11 | Ina - Drives & Mechatronics Gmbh & Co. Ohg | Electric motor having partial surge protection and method for the production thereof |
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