JPH0161016B2 - - Google Patents

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Publication number
JPH0161016B2
JPH0161016B2 JP58230129A JP23012983A JPH0161016B2 JP H0161016 B2 JPH0161016 B2 JP H0161016B2 JP 58230129 A JP58230129 A JP 58230129A JP 23012983 A JP23012983 A JP 23012983A JP H0161016 B2 JPH0161016 B2 JP H0161016B2
Authority
JP
Japan
Prior art keywords
magnet
signal
notch
magnetic pole
boundary line
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.)
Expired
Application number
JP58230129A
Other languages
Japanese (ja)
Other versions
JPS60125143A (en
Inventor
Shigeo Obata
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP58230129A priority Critical patent/JPS60125143A/en
Publication of JPS60125143A publication Critical patent/JPS60125143A/en
Publication of JPH0161016B2 publication Critical patent/JPH0161016B2/ja
Granted 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
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Description

【発明の詳細な説明】 産業上の利用分野 本発明はビデオ・テープレコーダー（以下
VTRと略す）等の回転ヘツドシリンダーのモー
ターに関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a video tape recorder (hereinafter referred to as
This relates to the motor of the rotating head cylinder of devices such as VTR (abbreviated as VTR).

従来例の構成とその問題点 近年VTR業界は薄形化、軽量化の傾向にあり、
それに伴ない、回転ヘツドシリンダーも小形、軽
量の物が多くなつてきている。Conventional configuration and its problems In recent years, the VTR industry has been trending toward thinner and lighter products.
Along with this, many rotating head cylinders are becoming smaller and lighter.

以下、図面を参照しながら従来の回転ヘツドシ
リンダーについて説明する。第１図は従来の回転
ヘツドシリンダーの横断面図であり、１は上シリ
ンダー、２は下シリンダー、３はメインマグネツ
ト、４はケイ素鋼板を積層したステータコア、５
はバツクヨーク、６はコイル、７，８はホール素
子、９はステータ基板、３０，３１はロータリー
トランスである。以上のように構成されたモータ
ーについてその動作を以下に説明する。 Hereinafter, a conventional rotary head cylinder will be explained with reference to the drawings. Figure 1 is a cross-sectional view of a conventional rotating head cylinder, in which 1 is an upper cylinder, 2 is a lower cylinder, 3 is a main magnet, 4 is a stator core made of laminated silicon steel plates, and 5 is a cross-sectional view of a conventional rotating head cylinder.
6 is a back yoke, 6 is a coil, 7 and 8 are Hall elements, 9 is a stator board, and 30 and 31 are rotary transformers. The operation of the motor configured as above will be explained below.

メインマグネツト３のホール素子７，８に対向
する側の端面には第２図に示すような着磁がなさ
れ、２つのホール素子７，８は互いに取付半径の
異なる位置にある。前記ホール素子７，８の出力
波形１０，１１（以下それぞれPM信号、PS信号
と呼ぶ）は三相のコイル６に誘起される逆起電力
波形１２，１３，１４と第３図に示す位相関係を
持つている。 The end face of the main magnet 3 facing the Hall elements 7, 8 is magnetized as shown in FIG. 2, and the two Hall elements 7, 8 are located at different mounting radii. The output waveforms 10, 11 (hereinafter referred to as PM signal and PS signal, respectively) of the Hall elements 7, 8 have a phase relationship with the back electromotive force waveforms 12, 13, 14 induced in the three-phase coil 6 as shown in FIG. have.

PM信号１０とPS波形１１の出力波形は合成さ
れ第３図に破線で示す位相信号１５，１６，１７
（以下それぞれP1信号、P2信号、P3信号と呼ぶ）
と１回転につき１回発生する原点位置信号１８
（以下PGパルスと呼ぶ）を得る。すなわち、PM
信号１０が正のレベルの時、P1信号１５が発生
し、第一相のコイルに通電される。PM信号１０
がレベルでかつ、PS信号１１が正のレベルの時
P2信号１６が発生し、第二相のコイルに通電さ
れる。PM信号１０が負のレベルでかつ、PS信号
１１が負のレベルの時P3信号１７が発生し、第
三相のコイルに通電される。PM信号１０が正の
レベルの時、PS信号１１が正のレベルから負の
レベルに反転すると、PGパルス１８が発生する。
PGパルス１８はモーターが１回転する間に１回
だけ発生し、速度検出器（図示しない）の出力信
号と比較演算され、ヘツド切換信号２０が発生す
る。 The output waveforms of the PM signal 10 and the PS waveform 11 are combined to produce phase signals 15, 16, 17 shown by broken lines in FIG.
(Hereafter referred to as P1 signal, P2 signal, and P3 signal respectively)
and the origin position signal 18 that is generated once per rotation.
(hereinafter referred to as PG pulse). That is, P.M.
When signal 10 is at a positive level, P1 signal 15 is generated and the first phase coil is energized. PM signal 10
is at level and PS signal 11 is at positive level
A P2 signal 16 is generated and the second phase coil is energized. When the PM signal 10 is at a negative level and the PS signal 11 is at a negative level, a P3 signal 17 is generated and the third phase coil is energized. When the PM signal 10 is at a positive level and the PS signal 11 is inverted from a positive level to a negative level, a PG pulse 18 is generated.
The PG pulse 18 is generated only once during one rotation of the motor, and is compared with the output signal of a speed detector (not shown) to generate a head switching signal 20.

上記説明から明らかなように、PGパルス１８
が発生するにはPS信号１１の波形中ｂ部１９は
PM信号１０が正のレベルにあるときになくては
ならず、また集積回路（IC）の駆動のためには
ｂ部１９の出力H1，H2はいづれもある一定以上
の値が必要である。 As is clear from the above explanation, PG pulse 18
In order for this to occur, the waveform b part 19 of the PS signal 11 must be
This is necessary when the PM signal 10 is at a positive level, and in order to drive an integrated circuit (IC), the outputs H 1 and H 2 of section b 19 must both have a value above a certain level. be.

しかしながら上記のような構成においては、第
２図ａ部の着磁幅ｗは小さくする必要があり、ま
たその場合PS信号１１の波形中ｂ部１９が第４
図ａに示すような出力の不均衡（温度変化が大き
くなると、図中破線で示す波形が出力され、PG
パルス１８が発生されなくなる）や、第４図ｂに
示すようにPM信号１０が正のレベルの範囲ｃ部
からはみ出て、モーターが円滑に回転しないとい
つた不良が発生しやすかつた。 However, in the above configuration, the magnetization width w of part a in FIG.
Output imbalance as shown in Figure a (when the temperature change increases, the waveform shown by the broken line in the figure is output, and the PG
(The pulse 18 is no longer generated) or the PM signal 10 goes out of the positive level range c as shown in FIG. 4b, causing problems such as the motor not rotating smoothly.

また周対向型モーターを用いているため、回転
ヘツドシリンダーの薄形化、軽量化には限界があ
つた。 Furthermore, since a circumferentially opposed motor was used, there was a limit to how thin and lightweight the rotary head cylinder could be.

発明の目的 本発明の目的は上記した従来の問題点を解決
し、小形、薄形、軽量な回転ヘツドシリンダー用
の平面対向モーターを提供することである。OBJECTS OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a small, thin, and lightweight planar motor for a rotary head cylinder.

発明の構成 本発明のモーターは、バツクヨークと一体的に
回転する第１のマグネツトと、この第１のマグネ
ツトに対向して、コイルと、少くとも２個の磁気
検出素子を配置したステータ基板とを有すると共
に、前記第１のマグネツトの内周部、もしくは外
周部の磁極の境界線に対して、対称形状に設けた
切欠部と、この切欠部に挿入され、磁極の境界線
が前記第１のマグネツトの磁極の境界線と一直線
上になるようにし、かつ前記磁気検出素子に対向
する面の磁極の極性を前記第１のマグネツトの切
欠き部の周囲の磁極の極性と互いに反対になるよ
うに着磁した第２のマグネツトとを具備したもの
であり、これにより、第３図中ｂ部１９の出力
H1，H2が安定に得られ、かつ第２のマグネツト
の円周方向長さｗは極めて小さくできるのでPM
信号１０のレベルが正のレベルにある範囲内ｃ部
に第３図中ｂ部１９の波形を容易に収めることが
でき、マグネツト径を小さくすることができる。Structure of the Invention The motor of the present invention includes a first magnet that rotates integrally with the back yoke, and a stator board that has a coil and at least two magnetic detection elements arranged opposite to the first magnet. and a notch provided in a symmetrical shape with respect to the boundary line of the magnetic poles on the inner peripheral part or the outer peripheral part of the first magnet; The magnet is aligned with the boundary line of the magnetic poles of the magnet, and the polarity of the magnetic pole on the surface facing the magnetic detection element is opposite to the polarity of the magnetic pole around the notch of the first magnet. The magnet is equipped with a magnetized second magnet, and as a result, the output of section b 19 in FIG.
Since H 1 and H 2 can be stably obtained and the circumferential length w of the second magnet can be made extremely small, PM
The waveform at section b 19 in FIG. 3 can be easily contained within section c within the range where the level of signal 10 is at a positive level, and the diameter of the magnet can be reduced.

実施例の説明 以下本発明の一実施例について、図面を参照し
ながら説明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

第５図は本発明の一実施例における回転ヘツド
シリンダーの横断面図である。第５図において、
３はメインマグネツト、５はバツクヨーク、６は
コイル、７，８はホール素子、９はステータ基
板、２１はPGマグネツト、３０，３１はロータ
リートランス、３２は流体軸受である。 FIG. 5 is a cross-sectional view of a rotating head cylinder in one embodiment of the present invention. In Figure 5,
3 is a main magnet, 5 is a back yoke, 6 is a coil, 7 and 8 are Hall elements, 9 is a stator board, 21 is a PG magnet, 30 and 31 are rotary transformers, and 32 is a hydrodynamic bearing.

メインマグネツト３とPGマグネツト２１はホ
ール素子７，８に対向する面の極性が第６図に示
すように着磁されており、メインマグネツト３の
内周部には、メインマグネツト３の磁極の境界線
２２と対称形状に設けた切欠き部２３があり、こ
の切欠部２３には、メインマグネツト３のもつ飽
和磁束密度Brより高いBr値を持つ材料から成る
PGマグネツト２１が挿入されている。PGマグネ
ツト２１の磁極の境界線２４はメインマグネツト
の磁極の境界線２２と直線上に並ぶようにPGマ
グネツト２１は挿入されている。メインマグネツ
ト３に対向するステータ基板９上には第７図に示
すように、コイル６とホール素子７，８が配置さ
れている。 The main magnet 3 and the PG magnet 21 are magnetized so that the polarities of the surfaces facing the Hall elements 7 and 8 are as shown in FIG. There is a notch 23 provided in a shape symmetrical to the boundary line 22 of the magnetic pole, and this notch 23 is made of a material having a B r value higher than the saturation magnetic flux density B r of the main magnet 3.
A PG magnet 21 is inserted. The PG magnet 21 is inserted so that the magnetic pole boundary line 24 of the PG magnet 21 is aligned with the magnetic pole boundary line 22 of the main magnet. As shown in FIG. 7, a coil 6 and Hall elements 7, 8 are arranged on a stator substrate 9 facing the main magnet 3.

以上の様に構成された本実施例のモーターにつ
いて以下その動作を説明する。 The operation of the motor of this embodiment configured as described above will be explained below.

まず、ホール素子７，８はメインマグネツト３
が回転すると、第３図に示すPM信号１０とPS信
号１１とを検出する。PM信号１０とPS信号１１
とは互いに合成され、P1信号１５、P2信号１６、
P3信号１７とPGパルス１８を得る。PGパルス
１８が発生するには、PS信号１１の波形中ｂ部
１９の波形はPM信号１０が正のレベルにあると
きになくてはならず、またICの駆動のためには
ｂ部１９の出力電圧H1，H2はある一定以上の値
が必要である。本実施例においてPGマグネツト
２１は、メインマグネツト３の持つ飽和磁束密度
Brより高いBr値を持つ材料からなり、かつ、メ
インマグネツト３の切欠部２３に挿入する前に飽
和着磁されている。これにより第６図に示すPG
マグネツト２１の幅ｗが小さくとも充分大きな出
力電圧H1，H2を得ることができ、かつ、第３図
に示すPS信号１１のｂ部１９の幅は、PM信号１
０が正のレベルにあるｃ部の幅より極めて小さく
することができる。 First, the Hall elements 7 and 8 are connected to the main magnet 3.
When it rotates, a PM signal 10 and a PS signal 11 shown in FIG. 3 are detected. PM signal 10 and PS signal 11
are combined with each other, P1 signal 15, P2 signal 16,
Obtain P3 signal 17 and PG pulse 18. In order to generate the PG pulse 18, the waveform of part b 19 in the waveform of the PS signal 11 must be present when the PM signal 10 is at a positive level, and in order to drive the IC, the part b 19 of the waveform of the PS signal 11 must be present when the PM signal 10 is at a positive level. The output voltages H 1 and H 2 need to have values above a certain level. In this embodiment, the PG magnet 21 has a saturation magnetic flux density of the main magnet 3.
It is made of a material with a B r value higher than B r and is magnetized to saturation before being inserted into the notch 23 of the main magnet 3 . As a result, the PG shown in Figure 6
Even if the width w of the magnet 21 is small, sufficiently large output voltages H 1 and H 2 can be obtained, and the width of the b portion 19 of the PS signal 11 shown in FIG.
It can be made much smaller than the width of section c where 0 is at a positive level.

また、PGマグネツト２１の磁極の境界線２４
とメインマグネツト３の磁極の境界線２２とは
略々一直線上にあるため、PS信号１１のｂ部１
９の出力電圧H1，H2が第４図ａに示すような不
均衡を生ずることが無く、量産時もバラツキの少
ない極めて安定な出力と波形を得ることが可能で
ある。 In addition, the boundary line 24 of the magnetic poles of the PG magnet 21
and the boundary line 22 of the magnetic poles of the main magnet 3 are almost in a straight line, so the part b 1 of the PS signal 11
There is no imbalance between the output voltages H 1 and H 2 of the output voltages H 1 and H 2 as shown in FIG.

なお、本実施例ではメインマグネツト３の内周
部に切欠き部２３を設けたが、切欠部２３はメイ
ンマグネツト３の外周部に設けてもよい。 In this embodiment, the notch 23 is provided on the inner periphery of the main magnet 3, but the notch 23 may be provided on the outer periphery of the main magnet 3.

発明の効果 以上の説明から明らかな様に、本発明はメイン
マグネツトの内周部もしくは外周部の磁極の境界
線に対して対称形状に設けた切欠部と、この切欠
部に挿入され、磁極の境界線がメインマグネツト
の磁極の境界線と一直線上になるようにし、かつ
ステータ基板上に配置したホール素子に対向する
面の磁極の極性をメインマグネツトの切欠部の周
囲の磁極の極性と互いに反対になるように着磁し
たPGマグネツトを備えた平面対向モーターであ
るため、PGパルスを極めて安定に得ることがで
き、小形、軽量、薄型の回転ヘツドシリンダー用
モーターを提供するることができる。Effects of the Invention As is clear from the above description, the present invention has a notch provided in a symmetrical shape with respect to the boundary line of the magnetic poles on the inner circumference or outer circumference of the main magnet, and a magnetic pole inserted into the notch. The polarity of the magnetic pole on the surface facing the Hall element arranged on the stator board should be set so that the boundary line is in line with the boundary line of the magnetic pole of the main magnet, and the polarity of the magnetic pole around the notch of the main magnet Since it is a planar opposed motor equipped with PG magnets that are magnetized in opposite directions, it is possible to obtain PG pulses extremely stably, making it possible to provide a small, lightweight, and thin rotary head cylinder motor. can.

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

第１図は従来の回転ヘツドシリンダーの横断面
図、第２図は従来の回転ヘツドシリンダーのモー
ターマグネツトの着磁状態図、第３図はホール素
子の出力波形、コイルに誘起される逆起電力波
形、位相信号波形、原点位置検出波形それぞれの
位相関係図、第４図ａ，ｂはホール素子の出力波
形図、第５図は本発明のモーターを採用した回転
ヘツドシリンダーの一実施例の横断面図、第６図
は本発明のモーターのマグネツトの着磁状態図、
第７図は本発明のモーターのステーター基板の平
面図である。 １……上シリンダー、２……下シリンダー、３
……メインマグネツト、５……バツクヨーク、６
……コイル、７，８……ホール素子、９……ステ
ータ基板、１０……PM波形、１１……PS波形、
１２，１３，１４……コイルに生ずる逆起電力波
形、１８……PGパルス、２１……PGマグネツ
ト。 Figure 1 is a cross-sectional view of a conventional rotary head cylinder, Figure 2 is a diagram of the magnetization state of the motor magnet of a conventional rotary head cylinder, and Figure 3 is the output waveform of the Hall element and the back emf induced in the coil. The phase relationship diagrams of the power waveform, phase signal waveform, and origin position detection waveform are shown in FIG. 4, a and b are output waveform diagrams of the Hall element, and FIG. A cross-sectional view, FIG. 6 is a diagram of the magnetization state of the magnet of the motor of the present invention,
FIG. 7 is a plan view of the stator board of the motor of the present invention. 1...Upper cylinder, 2...Lower cylinder, 3
...Main magnet, 5...Back yoke, 6
... Coil, 7, 8 ... Hall element, 9 ... Stator board, 10 ... PM waveform, 11 ... PS waveform,
12, 13, 14... Back electromotive force waveform generated in the coil, 18... PG pulse, 21... PG magnet.

Claims (1)

【特許請求の範囲】[Claims] １ バツクヨーク５と一体的に回転する第１のマ
グネツト３と、前記第１のマグネツト３に対向し
てコイル６と少くとも２個の磁気検出素子７，８
を配置したステータ基板９とを有すると共に、前
記第１のマグネツトの内周部もしくは外周部の磁
極の境界線に対して対称形状に設けた切欠き部２
３と、前記切欠き部に挿入され、磁極の境界線が
前記第１のマグネツトの磁極の境界線と一直線上
になるようにし、かつ前記磁気検出素子に対向す
る面の磁極の極性を前記第１のマグネツトの切欠
き部の周囲の磁極の極性と互いに反対になるよう
に着磁した第２のマグネツト２１とを具備したこ
とを特徴とするモーター。1 A first magnet 3 that rotates integrally with the back yoke 5, a coil 6 facing the first magnet 3, and at least two magnetic detection elements 7, 8.
a stator substrate 9 on which a stator substrate 9 is arranged, and a notch 2 provided in a symmetrical shape with respect to the boundary line of the magnetic poles on the inner circumference or outer circumference of the first magnet.
3, the magnetic pole is inserted into the notch so that the boundary line of the magnetic pole is on a straight line with the boundary line of the magnetic pole of the first magnet, and the polarity of the magnetic pole of the surface facing the magnetic detection element is set to the first magnet. 1. A motor comprising a second magnet 21 magnetized such that the polarity of the magnetic poles around the notch of the first magnet is opposite to each other.
JP58230129A 1983-12-06 1983-12-06 Motor Granted JPS60125143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58230129A JPS60125143A (en) 1983-12-06 1983-12-06 Motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58230129A JPS60125143A (en) 1983-12-06 1983-12-06 Motor

Publications (2)

Publication Number Publication Date
JPS60125143A JPS60125143A (en) 1985-07-04
JPH0161016B2 true JPH0161016B2 (en) 1989-12-26

Family

ID=16903024

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58230129A Granted JPS60125143A (en) 1983-12-06 1983-12-06 Motor

Country Status (1)

Country Link
JP (1) JPS60125143A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63136946A (en) * 1986-11-28 1988-06-09 Hitachi Ltd Cylinder motor
DE19905810A1 (en) * 1999-02-12 2000-08-17 Diehl Ako Stiftung Gmbh & Co Synchronous motor with rotor position detection
US10277084B1 (en) 2016-10-19 2019-04-30 Waymo Llc Planar rotary transformer
US10530209B2 (en) 2016-10-28 2020-01-07 Waymo Llc Devices and methods for driving a rotary platform
US10931175B2 (en) 2018-10-31 2021-02-23 Waymo Llc Magnet ring with jittered poles

Also Published As

Publication number Publication date
JPS60125143A (en) 1985-07-04

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