JPH01181159U - - Google Patents
Info
- Publication number
- JPH01181159U JPH01181159U JP7815988U JP7815988U JPH01181159U JP H01181159 U JPH01181159 U JP H01181159U JP 7815988 U JP7815988 U JP 7815988U JP 7815988 U JP7815988 U JP 7815988U JP H01181159 U JPH01181159 U JP H01181159U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- coil
- width
- ring
- shaped
- 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
- 238000001514 detection method Methods 0.000 claims description 7
- 230000005405 multipole Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000003708 edge detection Methods 0.000 description 1
Landscapes
- Rotational Drive Of Disk (AREA)
Description
第１図は本考案のインデツクス信号発生装置の
実施例を示す概略図、第２図はインデツクス信号
波形処理回路の動作を説明するブロツク図、第３
図は第２図の回路動作を説明するタイミングチヤ
ート、第４図は第１の従来例であるインデツクス
信号発生装置が組込まれたダイレクトドライブ型
スピンドルモータを示す概略構造図、第５図は第
２の従来例であるインデツクス信号発生装置を示
す概略図である。
１，１′……信号発生用マグネツト、２，２′
……リング状信号トラツク、２―１，２―１′…
…回転速度信号発生用磁極面、２―２，２―２′
……インデツクス信号発生用磁極面、３，３′…
…信号検出用コイル、３―１，３，１′……回転
速度信号検出用コイル、３―２，３―２′……イ
ンデツクス信号検出用コイル、３―３，３―３′
，３―４，３―４′……回転速度信号検出用コイ
ルの出力端子、３―５，３―５′，３―６，３―
６′……インデツクス信号検出用コイルの出力端
子、７……比較回路、８……基準電圧発生器、９
……エツジ検出回路、θ１……第１の磁極幅、ｎ
θ１……第２の磁極幅（ｎは２以上の正の整数）
。
FIG. 1 is a schematic diagram showing an embodiment of the index signal generator of the present invention, FIG. 2 is a block diagram explaining the operation of the index signal waveform processing circuit, and FIG.
The figure is a timing chart explaining the circuit operation of FIG. 2, FIG. 4 is a schematic structural diagram showing a direct drive spindle motor incorporating a first conventional index signal generator, and FIG. 1 is a schematic diagram showing a conventional index signal generating device. 1, 1'...Signal generation magnet, 2, 2'
...Ring signal track, 2-1, 2-1'...
...Magnetic pole surface for generating rotational speed signal, 2-2, 2-2'
...Magnetic pole surface for index signal generation, 3, 3'...
... Signal detection coil, 3-1, 3, 1'... Rotation speed signal detection coil, 3-2, 3-2'... Index signal detection coil, 3-3, 3-3'
, 3-4, 3-4'... Output terminal of rotational speed signal detection coil, 3-5, 3-5', 3-6, 3-
6'... Output terminal of index signal detection coil, 7... Comparison circuit, 8... Reference voltage generator, 9
...Edge detection circuit, θ 1 ...First magnetic pole width, n
θ 1 ... Second magnetic pole width (n is a positive integer of 2 or more)
.
Claims (1)
ブと直結したダイレクトドライブ型スピンドルモ
ータのロータに配置した、第１の磁極幅θ１で多
極着磁した磁極面と第２の磁極幅ｎθ１（ｎは２
以上の正の整数）で着磁したＮ．Ｓ１組の磁極面
とよりなるリング状信号トラツクと、上記モータ
のステータにこのリング状信号トラツクと対向す
るように配置した、ロータの回転速度に比例した
周波数の回転速度信号を検出するためのコイル幅
を前記第１の磁極幅θ１で連続して折返したクシ
歯状コイルとロータの１回転に付き１回周期の異
なる波形のインデツクス信号を検出するためのコ
イル幅を前記第１の磁極幅θ１で折返した１ター
ンのコイルとを隣接配置したリング状信号検出コ
イルとよりなることを特徴とするフロツピーデイ
スク装置におけるインデツクス信号発生装置。 A multi-pole magnetized magnetic pole surface with a first magnetic pole width θ 1 and a second magnetic pole width nθ 1 (n is 2
or more positive integer)). a ring-shaped signal track made up of S1 sets of magnetic pole surfaces; and a coil arranged on the stator of the motor to face the ring-shaped signal track, for detecting a rotational speed signal having a frequency proportional to the rotational speed of the rotor. The first magnetic pole width is a comb-shaped coil whose width is continuously folded back by the first magnetic pole width θ1 , and the coil width for detecting the index signal of a waveform that has a different period once per rotation of the rotor. 1. An index signal generating device for a floppy disk device, comprising a ring-shaped signal detection coil in which a one-turn coil folded back at θ1 is arranged adjacent to the ring-shaped signal detection coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7815988U JPH01181159U (en) | 1988-06-13 | 1988-06-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7815988U JPH01181159U (en) | 1988-06-13 | 1988-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01181159U true JPH01181159U (en) | 1989-12-27 |
Family
ID=31303107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7815988U Pending JPH01181159U (en) | 1988-06-13 | 1988-06-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01181159U (en) |
-
1988
- 1988-06-13 JP JP7815988U patent/JPH01181159U/ja active Pending
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