JPH0371413A - Rotary cylinder device - Google Patents

Rotary cylinder device

Info

Publication number
JPH0371413A
JPH0371413A JP20809989A JP20809989A JPH0371413A JP H0371413 A JPH0371413 A JP H0371413A JP 20809989 A JP20809989 A JP 20809989A JP 20809989 A JP20809989 A JP 20809989A JP H0371413 A JPH0371413 A JP H0371413A
Authority
JP
Japan
Prior art keywords
coil
hole
fixed cylinder
back yoke
bottom plane
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
Application number
JP20809989A
Other languages
Japanese (ja)
Other versions
JP2714165B2 (en
Inventor
Koichi Kawakami
浩一 川上
Masazumi Nishiguchi
西口 正純
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
Original Assignee
Sanyo Electric 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 filed Critical Sanyo Electric Co Ltd
Priority to JP20809989A priority Critical patent/JP2714165B2/en
Publication of JPH0371413A publication Critical patent/JPH0371413A/en
Application granted granted Critical
Publication of JP2714165B2 publication Critical patent/JP2714165B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To dispense with a specific space for arranging a PG coil and to miniaturizing and thinning by forming a through hole on the bottom plane of a back yoke, and embedding the PG coil for rotating phase detection at a position confronting with the through hole on the bottom plane of a fixed cylinder. CONSTITUTION:The through hole 18 is formed at the back yoke 15, and it is formed in the neighborhood of the center of a magnetic pole, and the PG coil 20 for rotating phase detection is embedded at the position confronting with the through hole 18 on the bottom plane 19 of the fixed cylinder 1. High magnetic flux density exists in the neighborhood of the through hole 18 due to leakage magnetic flux, and a voltage is excited in the PG coil 20 according to the rotation of a rotary part including the back yoke 15, and a PG signal is formed. Also, since the PG coil is embedded in the bottom plane of the fixed cylinder 1, no specific space for the arrangement of the PG coil 20 is required. Thereby, a rotary cylinder device can be miniaturized and made thin.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明はビデオテープレコーダ(VTR)等の回転シリ
ンダ装置に関する。
DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a rotating cylinder device such as a video tape recorder (VTR).

(ロ) 従、米の技術 従来、VTR等の回転シリンダ装置における回転位相の
検出は、回転部に回転位相検出用の小磁石を設けると共
に、固定部に、小磁石と対向して回転位相検出用のPG
コイルを設け、回転部の回転に伴いPGコイルに励起さ
れる電圧からPG信号を発生させ、検出を行う構成とな
っている。
(b) Conventionally, the detection of the rotational phase in a rotating cylinder device such as a VTR has been carried out by providing a small magnet for detecting the rotational phase in the rotating part, and a fixed part facing the small magnet to detect the rotational phase. PG for
A coil is provided, and a PG signal is generated from a voltage excited in the PG coil as the rotating part rotates, and detection is performed.

また、実開昭59−103579号公報(HO2に29
100)には、ロータマグネットを覆う皿状ロータヨー
クの外周の筒面に切欠を設け、ロータマグネットから漏
洩する磁束を利用してPGコイルに電圧をra起させる
構成とすることにより、回転位相検出用の小磁石等の部
品を削減することができるブラシレスモータが示されて
いる。
Also, Japanese Utility Model Application Publication No. 59-103579 (29 in HO2
100) has a configuration in which a notch is provided on the outer cylindrical surface of the dish-shaped rotor yoke that covers the rotor magnet, and the magnetic flux leaking from the rotor magnet is used to generate a voltage ra in the PG coil, thereby making it possible to detect the rotational phase. A brushless motor is shown that can eliminate parts such as small magnets.

(ハ)発明が解決しようとする課題 しかし、上記ブラシレスモータでは、ロータヨーク側方
にPGコイルを設けるためのスペースを確保する必要が
あり、このブラシレスモータを回転シリンダ装置に用い
た場合、小型化、薄型化等を行う場合に、PGコイルの
配置スペースが間臆となることがある。
(c) Problems to be Solved by the Invention However, in the brushless motor described above, it is necessary to secure space for installing the PG coil on the side of the rotor yoke. When making the device thinner, the space for arranging the PG coil may be limited.

本発明は、回転位相検出用の小磁石が不要であリ、また
、PGコイルを設けるための特別なスペースを必要とせ
ず、小型化、薄型化が可能な回転シリンダ装置を提供す
るものである。
The present invention provides a rotating cylinder device that does not require a small magnet for rotational phase detection, does not require a special space for installing a PG coil, and can be made smaller and thinner. .

(ニ)課題を解決するための手段 本発明は、固定シリンダ内に、円板状のロータマグネッ
ト上方にステータコイルを対向して成るブラシレスモー
タを内蔵する回転シリンダ装置において、ロータマグネ
ットを覆う皿状0バツクヨークの底面に透孔を形成する
と共に、固定シリンダ底面の、前記透孔に対向する休養
に回転位相検出用のPGコイルを埋設することを特徴と
する。
(D) Means for Solving the Problems The present invention provides a rotary cylinder device in which a brushless motor is built in a fixed cylinder and has a stator coil facing above a disc-shaped rotor magnet. The present invention is characterized in that a through hole is formed in the bottom surface of the zero back yoke, and a PG coil for detecting the rotational phase is embedded in a hole in the bottom surface of the fixed cylinder opposite to the through hole.

(ホ〉作用 本発明は以上の様に構成されているので、回転部の同転
に伴い、透孔より漏洩する磁束によりPGコイルに電圧
が励起される。また、PGコイルは固定シリンダ底面に
埋設されているため、PGコイルを配設するための特別
なスペースを必要としない。
(E) Effect Since the present invention is constructed as described above, voltage is excited in the PG coil by the magnetic flux leaking from the through hole as the rotating parts rotate. Since it is buried, no special space is required for arranging the PG coil.

(へ)実施例 以下図面に従い本発明の一実施例について説明する。(f) Example An embodiment of the present invention will be described below with reference to the drawings.

第1図は実施例の回転シリンダ装置の断面図、第2図は
バックヨーク部分の平面図である。
FIG. 1 is a sectional view of the rotary cylinder device of the embodiment, and FIG. 2 is a plan view of the back yoke portion.

図において、(1〉は固定シリンダ、(2)は固定シリ
ンダ(1)に支持される固定シャフト、(3)は軸受部
(4)を介して固定シャフト(2)に回転可能に支持さ
れるディスク、(5)はディスク(3)にネジ(6)に
より固定され、ディスク(3)と一体となって回転する
回転シリンダ、(7)は回転シリンダ(5)下面に、ヘ
ッドベース(8)を介して取付けられている磁気ヘッド
である。(9)は回転シリンダ(5)内に配されるロー
タリトランスであり、ロータ側(10)は回転シリンダ
(5)上面に、ステータ側(11)は固定シャフト(2
)上端に圧入固定されているボス(12)に固着されて
いる。(13)は固定シノンダ(1)内に配され、回転
シリンダ(5)を回転させる駆動力を発生するブラシレ
スモータである。ブラシレスモータ(13)は、外周部
を固定シリンダ(1)内面に固定されるステータコイル
(14〉、バックヨーク(15)を介してディスク(3
)に取付けられているロータマグネット(16〉、及び
ステータコイル(14)を挟んでロータマグネット(1
6)と対向して配設される様に、ディスク(3)に取付
けられているロータヨーク(17)とから構成されてい
る。
In the figure, (1> is a fixed cylinder, (2) is a fixed shaft supported by the fixed cylinder (1), and (3) is rotatably supported by the fixed shaft (2) via a bearing part (4). The disk (5) is a rotating cylinder that is fixed to the disk (3) with a screw (6) and rotates together with the disk (3), and (7) is a head base (8) on the underside of the rotating cylinder (5). (9) is a rotary transformer placed inside the rotating cylinder (5), and the rotor side (10) is attached to the upper surface of the rotating cylinder (5), and the stator side (11) is attached to the upper surface of the rotating cylinder (5). is the fixed shaft (2
) It is fixed to a boss (12) which is press-fitted into the upper end. (13) is a brushless motor that is disposed within the fixed cylinder (1) and generates a driving force to rotate the rotary cylinder (5). The brushless motor (13) includes a stator coil (14) whose outer periphery is fixed to the inner surface of the fixed cylinder (1), and a disk (3) via a back yoke (15).
) is attached to the rotor magnet (16), and the rotor magnet (16) is attached to the rotor magnet (16) with the stator coil (14) in between.
6) and a rotor yoke (17) attached to the disk (3) so as to face the rotor yoke (17).

バンクヨーク(15)には透孔(18)が形成されてい
る。本実施例においては、第2図に示される様に、透孔
(18)は磁極の中心付近に形成されている。固定シリ
ンダ(1)の底面(19)には、透孔(18)に対向す
る位置に、回転位相検出用のPGコイル(20)が埋設
されている。(21)はコアである。透孔(18)付近
は漏洩磁束により磁束密度が高くなっており、よって、
バックヨーク(15)を含む同転部の回転に伴い、PG
コイル(20)に電圧が励起され、PG信号が形成され
る。
A through hole (18) is formed in the bank yoke (15). In this embodiment, as shown in FIG. 2, the through hole (18) is formed near the center of the magnetic pole. A PG coil (20) for rotational phase detection is embedded in the bottom surface (19) of the fixed cylinder (1) at a position facing the through hole (18). (21) is the core. The magnetic flux density is high near the through hole (18) due to leakage magnetic flux, so
With the rotation of the rotary part including the back yoke (15), the PG
A voltage is excited in the coil (20) and a PG signal is formed.

尚、透孔(18)の形成位置、形状等は上記実施例に限
定されるものでなく種々変更が可能である。
Note that the formation position, shape, etc. of the through hole (18) are not limited to the above embodiments, and can be variously modified.

例えば、第3図に示される様に、透孔(18)を磁極の
境界に形成する構成としてもよく、また、形状を円形で
はなく、スリット状等に形成してもよい。
For example, as shown in FIG. 3, the through holes (18) may be formed at the boundaries of the magnetic poles, or the shape may be slit-like instead of circular.

(ト)発明の効果 以上に述べた様に本発明によれば、回転位相検出用の小
磁石等の部品が削減され、組立工数、コスト等を低減す
ることができる。また、1) Gコイルは固定シリンダ
底面に埋設されるため、PGコイルを配設するための特
別なスペースを必要とせず、よって回転シリンダ装置を
小型化、薄型化することができ、その効果は大である。
(G) Effects of the Invention As described above, according to the present invention, parts such as small magnets for detecting rotational phase can be reduced, and assembly man-hours, costs, etc. can be reduced. In addition, 1) Since the G coil is buried in the bottom of the fixed cylinder, no special space is required for arranging the PG coil, and the rotating cylinder device can therefore be made smaller and thinner. It's large.

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

図面は全て実施例に係り、第1図は実施例の回転シリン
ダ装置の断面図、第2図はバックヨーク部分の平面図、
第3図は透孔と磁極との付置関係を第2図とは異ならし
めた他の実施例を示す図である。 (1)・・・固定シリンダ、(5)・・・回転シリンダ
、(7)・・・磁気ヘッド、(13)・・・ブラシレス
モータ、(14)・・・ステータコイル、(15)・・
・バックヨーク、(16)・・・ロータマグネット、(
18)・・・透孔、(19)・・・固定シリンダ底面、
(20)・・・PGコイル。
The drawings all relate to the embodiment; FIG. 1 is a sectional view of the rotary cylinder device of the embodiment, FIG. 2 is a plan view of the back yoke portion,
FIG. 3 is a diagram showing another embodiment in which the placement relationship between the through hole and the magnetic pole is different from that in FIG. 2. (1)...Fixed cylinder, (5)...Rotating cylinder, (7)...Magnetic head, (13)...Brushless motor, (14)...Stator coil, (15)...
・Back yoke, (16)...rotor magnet, (
18)...Through hole, (19)...Fixed cylinder bottom surface,
(20)...PG coil.

Claims (1)

【特許請求の範囲】[Claims] (1)固定シリンダ上方に、磁気ヘッドを備える回転シ
リンダを対向配置し、前記固定シリンダ内に、円板状の
ロータマグネット上方にステータコイルを対向して成る
ブラシレスモータを内蔵する回転シリンダ装置において
、前記ロータマグネットを覆う皿状のバックヨークの底
面に形成される透孔と、該透孔に対向する様に、前記固
定シリンダ底面に埋設される回転位相検出用のPGコイ
ルとを備えることを特徴とする回転シリンダ装置。
(1) A rotary cylinder device in which a rotary cylinder equipped with a magnetic head is disposed facing above a fixed cylinder, and a brushless motor having a stator coil facing above a disc-shaped rotor magnet is built in the fixed cylinder, It is characterized by comprising a through hole formed in the bottom surface of a dish-shaped back yoke that covers the rotor magnet, and a PG coil for rotational phase detection buried in the bottom surface of the fixed cylinder so as to face the through hole. Rotating cylinder device.
JP20809989A 1989-08-11 1989-08-11 Rotary cylinder device Expired - Fee Related JP2714165B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20809989A JP2714165B2 (en) 1989-08-11 1989-08-11 Rotary cylinder device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20809989A JP2714165B2 (en) 1989-08-11 1989-08-11 Rotary cylinder device

Publications (2)

Publication Number Publication Date
JPH0371413A true JPH0371413A (en) 1991-03-27
JP2714165B2 JP2714165B2 (en) 1998-02-16

Family

ID=16550619

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20809989A Expired - Fee Related JP2714165B2 (en) 1989-08-11 1989-08-11 Rotary cylinder device

Country Status (1)

Country Link
JP (1) JP2714165B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660489A (en) * 1992-08-06 1994-03-04 Yamauchi Corp Magnetic type torque limiter
US8007881B2 (en) 2002-07-16 2011-08-30 Misawa Homes Co., Ltd. Wood-like molded product, manufacturing apparatus for the same, and manufacturing method of the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660489A (en) * 1992-08-06 1994-03-04 Yamauchi Corp Magnetic type torque limiter
US8007881B2 (en) 2002-07-16 2011-08-30 Misawa Homes Co., Ltd. Wood-like molded product, manufacturing apparatus for the same, and manufacturing method of the same

Also Published As

Publication number Publication date
JP2714165B2 (en) 1998-02-16

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