JPS59122391A - Motor rotating speed control circuit for magnetic disk device - Google Patents
Motor rotating speed control circuit for magnetic disk deviceInfo
- Publication number
- JPS59122391A JPS59122391A JP57232679A JP23267982A JPS59122391A JP S59122391 A JPS59122391 A JP S59122391A JP 57232679 A JP57232679 A JP 57232679A JP 23267982 A JP23267982 A JP 23267982A JP S59122391 A JPS59122391 A JP S59122391A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- circuit
- metal film
- motor
- rotation speed
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/2855—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rotational Drive Of Disk (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、磁気ディスク装置のモータ回転数制卸回路の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a motor rotation speed control circuit for a magnetic disk device.
従来、この種の装置として、例えばモータの回転数をタ
コジェネレータ等の検出器で検出して帰還し、この検出
値に応じた出刃時間幅を有するパルス信号を時定数回路
を備えた単安定回路から発生し、このパルス信号を積分
回路で積分してその積分出力に対応する電流を上記モー
タに供給し、これによりモータの回転数を制御するよう
にしたものがある。Conventionally, as this type of device, for example, a monostable circuit equipped with a time constant circuit detects the rotation speed of a motor with a detector such as a tacho generator and returns it, and sends a pulse signal having a cutting time width according to this detected value. There is a device in which this pulse signal is generated by an integrating circuit, and a current corresponding to the integrated output is supplied to the motor, thereby controlling the rotation speed of the motor.
ところがこのような従来の回路は、モータの回転数を決
定する時定数回路のコンデンサや抵抗器の値が温度特性
を持っているため、周囲の温度変化に応じてモータの回
転数が変動を起こす。そこで、従来では上記温度変化の
影響を軽減するために、コンデンサおよび抵抗器に互い
に逆の温度係数を有する素子をそれぞれ選定し、これに
よりモータの回転数変動を低減するようにしている。し
かるに、このようにした場合、コンデンサと抵抗器との
各温度特性を合わせることが非常に難しく、現実として
モータの回転数変動を±３％以下に抑えることができな
かった。このことは、磁気ディスクを駆動するに際し読
出し精度の低下を招いて、高密度記録化をはかる上で大
きなネックとなり、非常に好ましくなかった。However, in conventional circuits like this, the values of the capacitors and resistors in the time constant circuit that determine the motor rotation speed have temperature characteristics, so the motor rotation speed may fluctuate in response to changes in the surrounding temperature. . Therefore, conventionally, in order to reduce the influence of the temperature change, elements having opposite temperature coefficients are selected for the capacitor and the resistor, respectively, thereby reducing fluctuations in the rotational speed of the motor. However, in this case, it is very difficult to match the temperature characteristics of the capacitor and the resistor, and in reality, it has not been possible to suppress the variation in the rotational speed of the motor to less than ±3%. This is extremely undesirable, as it causes a drop in read accuracy when driving the magnetic disk, and becomes a major bottleneck in achieving high-density recording.
本発明は、時定数回路の温度特性を精度良く油゛
保償し得るようにしてモータの回転数変動を低減し、磁
気ディスクの読出精度’ｒ Ｅめて高密度記録化をはか
り得る磁気ディスク装置のモータ回転数制御回路を提供
することを目的とする。The present invention makes it possible to guarantee the temperature characteristics of a time constant circuit with high precision, thereby reducing fluctuations in the rotational speed of a motor, thereby improving the reading accuracy of a magnetic disk, thereby realizing a magnetic disk capable of achieving high-density recording. The purpose of this invention is to provide a motor rotation speed control circuit for a device.
本発明は、上記目的を違反するために、時定数回路を構
成するコンデンサおよび抵抗器をそれぞれポリエチレン
コンデンサおよび金属被膜抵抗器とし、かつこの金属被
膜抵抗器に対し直列もしくは並列に、上記ポリエチレン
コンデンサの温度係数を上記金属被膜抵抗器と協働して
相殺すべく温度係数を定めた感温抵抗器を接続したもの
である。In order to overcome the above object, the present invention uses a polyethylene capacitor and a metal film resistor as the capacitor and resistor constituting the time constant circuit, respectively, and connects the polyethylene capacitor in series or parallel to the metal film resistor. A temperature sensitive resistor having a determined temperature coefficient is connected in order to cooperate with the metal film resistor to offset the temperature coefficient.
図は、本発明の一実施例におけるモータ回転数制御回路
の回路構成図である。この回路は、磁気ディスク駆動用
のモータ１の回転数をタコジェネレータ２で検出し、そ
の検出出力パルスをサーボ回路３に導入している。この
サーボ回路３は、上記検出出力パルスを増幅器３１を介
して単安定回路３２に導びいている。この単安定回路３
２は、上記検出出力パルスが入力される毎に、後述する
時定数回路４により定められた出力時間幅（パルス幅）
のパルス信号を発生するものである。そしてサーボ回路
３は、上記単安定回路３２からのパルス信号を積分回路
３３で積分し、その出力電流（ｉ：電流増幅器３４で増
幅してモータ駆動用トランジスタ５に供給し、これによ
りモータ１を駆動側ＭＩ している。The figure is a circuit configuration diagram of a motor rotation speed control circuit in one embodiment of the present invention. This circuit detects the rotational speed of a motor 1 for driving a magnetic disk using a tacho generator 2, and introduces the detected output pulse to a servo circuit 3. This servo circuit 3 guides the detection output pulse to a monostable circuit 32 via an amplifier 31. This monostable circuit 3
2 is an output time width (pulse width) determined by a time constant circuit 4, which will be described later, each time the detection output pulse is input.
It generates a pulse signal. Then, the servo circuit 3 integrates the pulse signal from the monostable circuit 32 with an integrating circuit 33, and outputs the resulting current (i: amplified with a current amplifier 34 and supplies it to the motor drive transistor 5, thereby driving the motor 1. Drive side MI is on.
なお、図中３５は上記各回路へ電源出力を供給するだめ
の安定化電源、３６はオーバシュート防止回路、３７は
駆動用トランジスタ５への供給電流を制限する電流制限
回路である。In the figure, 35 is a stabilized power supply for supplying power output to each of the circuits described above, 36 is an overshoot prevention circuit, and 37 is a current limiting circuit for limiting the current supplied to the driving transistor 5.
さて、時定数回路４は、ポリエチレンコンデンサからな
る容量素子４１と、金属被膜型の固定抵抗器４２に対し
金属被膜型の可変抵抗器４３を直列に接続し、かつ上記
固定抵抗器４２に感温抵抗器４４を直列に接続した抵抗
回路とから構成されている。Now, the time constant circuit 4 has a capacitive element 41 made of a polyethylene capacitor, a metal film type variable resistor 43 connected in series to a metal film type fixed resistor 42, and a temperature sensitive element 43 connected to the fixed resistor 42. It is composed of a resistance circuit in which a resistor 44 is connected in series.
ところで、モータ１の回転数Ｎは、時定数回路における
容量素子４１の容量をＣτ、固定抵抗器４２の抵抗値を
Ｒτ、可変抵抗器４３の抵抗値をＶＲ１感温抵抗器４４
の抵抗値をＲτ８とすると、
で衣わされる。ただし、Ｋはサーボ回路３０時定数／回
転数変換の定数である。By the way, the rotation speed N of the motor 1 is determined by the capacitance of the capacitive element 41 in the time constant circuit being Cτ, the resistance value of the fixed resistor 42 being Rτ, and the resistance value of the variable resistor 43 being VR1, the temperature sensing resistor 44
Letting the resistance value of Rτ8 be expressed as follows. However, K is a constant of the servo circuit 30 time constant/rotation speed conversion.
したがって、先に述べたように容量素子４１をボリエｇ
コンデンサとし、かつ固定および可変各抵抗器４２．４
３を金属被膜型として、さらに感温抵抗器４３を用いた
本実施例の回路では、上記各素子の温度係数および湿度
変化量が
のような値を有することから、ポリエチレンコンデンサ
の温度係数（−１２０ｐｐｍ／’Ｃ）を相殺すべく、抵
抗回路（Ｒｏτ）の温度係数が＋１２０ｐｐｍ／”Ｃに
なるように、感温抵抗器の温度係数を設駕すればよいこ
とになる。Therefore, as mentioned earlier, the capacitive element 41 is
A capacitor, and each fixed and variable resistor 42.4
In the circuit of this embodiment in which the capacitor 3 is a metal film type and the temperature sensitive resistor 43 is used, since the temperature coefficient and humidity change amount of each of the above elements have the following values, the temperature coefficient of the polyethylene capacitor (- 120 ppm/'C), the temperature coefficient of the temperature sensitive resistor should be set so that the temperature coefficient of the resistance circuit (Roτ) becomes +120 ppm/'C.
ここで、抵抗回路（Ｒｏτ）に対する固定抵抗器（Ｒτ
）４２、可変抵抗器（ＶＲ）４３および感温抵抗器（Ｒ
τＢ）４４の温度係数の寄与率は、それぞれ
Ｒτり８６．５％
ＶＲ−８，１％
８７ｇ−５，４％
となる。したがって、例えば感温抵抗器４４の温度係数
を２２００ ｐｐｍ ／’Ｃに設定したとすると、各抵
抗器の温度係数は、
Ｒτ冒± ４３．３ ｐｐｍ／’Ｃ
ＶＲ−± １６．２ ｐｐｍ／”Ｃ
ＲτＢ −＋ １１８．４ ｐ ｐｍ／”ＣＮτＴＹＰ
−Ｋ・（ＣＴ＋ＲＯＴ）
＝ −１，１７（−１２０＋１１８．４ ）＝ ＋ １
．９ ｐｐｍ ／’Ｃ
となる。また同様にＲｒ＝ −４３，３ｐｐｍ ／’Ｃ
。Here, a fixed resistor (Rτ
) 42, variable resistor (VR) 43 and temperature sensitive resistor (R
The contribution rates of the temperature coefficient of τB) 44 are as follows: Rτ - 86.5% VR - 8.1% 87g - 5.4%. Therefore, for example, if the temperature coefficient of the temperature sensitive resistor 44 is set to 2200 ppm/'C, the temperature coefficient of each resistor is Rτ± 43.3 ppm/'C VR-± 16.2 ppm/'' C RτB −+ 118.4 p pm/”CNτTYP
-K・(CT+ROT) = -1,17(-120+118.4)=+1
．． 9 ppm/'C. Similarly, Rr=-43,3ppm/'C
.
Ｖ Ｒ＝−１６，２ｐ ｐｍ／’Ｃのときには、Ｎτｍ
ａｘ−１，１７（−１２０−１６，２−４３，３＋１１
８．４）＝ ＋ ７１．５ ｐ ｐ ｒｎ／”Ｃとなり
、Ｒｒ −＋ ４３．３ ｐｐｍ／”Ｃ１ＶＲ−＋１６
．２ｐ ｐ ｍ／ ”Ｃのときには
Ｎ７ｍ１ｎ−１，１７（１２０＋１６．２＋４３．３＋
１１８．４）÷−６６，７ｐｐｍ／ ”Ｃ
となる。When V R = -16,2p pm/'C, Nτm
ax-1,17(-120-16,2-43,3+11
8.4) = + 71.5 p p rn/”C, Rr −+ 43.3 ppm/”C1VR−+16
．． 2p p m/” When C, N7m1n-1,17(120+16.2+43.3+
118.4)÷-66.7ppm/''C.
ここで、使用温度範囲を＋５℃〜＋４５℃とし、かつ２
５℃で回転数をセットしたとすると、このときの温度変
化は±２０℃であるから、モータの回転数変動率Ｎｃは
、
となる。Here, the operating temperature range is +5℃ to +45℃, and
Assuming that the rotation speed is set at 5° C., the temperature change at this time is ±20° C., so the rotation speed fluctuation rate Nc of the motor is as follows.
このように、本実施例の回路であれば、モータ１の回転
数変動率は、従来の３％以上に比べて±０，１５％（１
／２０）以下と、極めて小さくなる。したがって、磁気
ディスクの回転動作の安定性を高めることができ、この
結果読出し精度を同上し得て記憶容量を増加することが
できる。In this way, with the circuit of this embodiment, the rotation speed fluctuation rate of the motor 1 is ±0.15% (1
/20) or less, which is extremely small. Therefore, the stability of the rotational operation of the magnetic disk can be improved, and as a result, the read accuracy can be improved and the storage capacity can be increased.
また、本実施例の回路であれば、感温抵抗器４４の湿度
変化量が負であるため、金属被膜型固定抵抗器４２の正
の成分を相殺でき、これにより湿度変化に対する回転数
変動を低減することができる。In addition, in the circuit of this embodiment, since the amount of humidity change in the temperature sensitive resistor 44 is negative, the positive component of the metal film fixed resistor 42 can be canceled out, thereby suppressing rotation speed fluctuations due to humidity changes. can be reduced.
なお本発明は、上記実施例に限定されるものではない。Note that the present invention is not limited to the above embodiments.
例えば、感温抵抗器は固定抵抗器に対し並列に接続する
ようにしてもよい。その他、サーボ回路の回路描成や時
定数回路の構成等についても、本発明の要旨を逸脱しな
い範囲で種々罰形して実施できる。For example, a temperature sensitive resistor may be connected in parallel to a fixed resistor. In addition, the circuit drawing of the servo circuit, the configuration of the time constant circuit, etc. may be modified in various ways without departing from the gist of the present invention.
以上詳述したように本発明は、時定数回路を構成するコ
ンデンサおよび抵抗器をそれぞれポリエチレンコンデン
サおよび金属被膜抵抗器とし、かつこの金属被膜抵抗器
に対し直列もしくは並列に、上記ポリエチレンコンデン
サの温度係数を上記金属被膜抵抗器と協働して相殺すべ
く温度係数も定めた感温抵抗器を接続したものである。As detailed above, the present invention uses a polyethylene capacitor and a metal film resistor as the capacitor and resistor constituting the time constant circuit, respectively, and connects the temperature coefficient of the polyethylene capacitor in series or parallel to the metal film resistor. A temperature sensitive resistor having a determined temperature coefficient is connected to the metal film resistor in cooperation with the metal film resistor.
したがって、本発明によれば、時定数回路の稙
温度特性を精度良く休演し得てモータの回転数変動を低
減し、磁気ディスクの読出精度を高めて高密度記録化を
はかることができる磁気ディスク装置のモータ回転数制
御回路を提供することができる。Therefore, according to the present invention, there is provided a magnetic disk in which the temperature characteristic of the time constant circuit can be precisely controlled, the fluctuation in the rotational speed of the motor can be reduced, and the reading accuracy of the magnetic disk can be improved to achieve high-density recording. A motor rotation speed control circuit for the device can be provided.
【図面の簡単な説明】
図は本発明の一実施例におけるモータ回転数制御回路の
回路構成図である。
１・・・モータ、２・・・タコジェネレータ、３・・・
サーボ回路、４・・・時定数回路、４ノ・・・ポリエチ
レンコンデンサ（容量素子）、４２・・・全屈被膜型固
定抵抗器、４３・・・金属被膜型可使抵抗器、４４・・
・感温抵抗器、５・・・モータ駆動用トランジスタ。BRIEF DESCRIPTION OF THE DRAWINGS The figure is a circuit configuration diagram of a motor rotation speed control circuit in an embodiment of the present invention. 1...Motor, 2...Tachogenerator, 3...
Servo circuit, 4... Time constant circuit, 4... Polyethylene capacitor (capacitive element), 42... Full bending film type fixed resistor, 43... Metal film type usable resistor, 44...
・Temperature-sensitive resistor, 5...Transistor for motor drive.
Claims (1)
じた出力時間幅を有するパルス信号を時定数回路を備え
た単安定回路から発生してこのパルス信号を積分し、こ
の積分出力に応じて前記モータの回転数を制御する磁気
ディスク装置のモータ回転数制御回路において、前記時
定数回路を構成する容量菓子および抵抗素子をそれぞれ
ポリエチレンコンデンサおよび金属被膜型抵抗器とし、
かつこの金属被膜型抵抗器に対し直列もしくは並列に、
前記ポリエチレンコンデンサの温度係数を前記金１編被
膜型抵抗器と協働して相殺すべく温度係数を設定した感
温抵抗器を接続したことを特徴とする磁気ディスク装置
のモータ回転数制卸（ロ）路。The rotation speed information of the motor is detected and returned, a pulse signal having an output time width according to this detected value is generated from a monostable circuit equipped with a time constant circuit, this pulse signal is integrated, and this integrated output is generated. In a motor rotation speed control circuit of a magnetic disk device that controls the rotation speed of the motor according to
And in series or parallel to this metal film resistor,
A motor rotation speed control for a magnetic disk device, characterized in that a temperature sensitive resistor having a temperature coefficient set to cancel out the temperature coefficient of the polyethylene capacitor in cooperation with the gold film resistor is connected. b) Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57232679A JPS59122391A (en) | 1982-12-25 | 1982-12-25 | Motor rotating speed control circuit for magnetic disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57232679A JPS59122391A (en) | 1982-12-25 | 1982-12-25 | Motor rotating speed control circuit for magnetic disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59122391A true JPS59122391A (en) | 1984-07-14 |
Family
ID=16943089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57232679A Pending JPS59122391A (en) | 1982-12-25 | 1982-12-25 | Motor rotating speed control circuit for magnetic disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59122391A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61198467A (en) * | 1985-02-28 | 1986-09-02 | Canon Inc | Magnetic disc device |
-
1982
- 1982-12-25 JP JP57232679A patent/JPS59122391A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61198467A (en) * | 1985-02-28 | 1986-09-02 | Canon Inc | Magnetic disc device |
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