JPH04325890A - Motor driving apparatus - Google Patents
Motor driving apparatusInfo
- Publication number
- JPH04325890A JPH04325890A JP3093789A JP9378991A JPH04325890A JP H04325890 A JPH04325890 A JP H04325890A JP 3093789 A JP3093789 A JP 3093789A JP 9378991 A JP9378991 A JP 9378991A JP H04325890 A JPH04325890 A JP H04325890A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- speed
- signal
- high frequency
- current
- 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
Links
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、直流モータを一定速度
で駆動するモータ駆動装置の誤動作防止方法に関するも
のである。
【０００２】
【従来の技術】直流モータを一定速度で駆動するモータ
駆動装置は、例えばカーテンの開閉を自動的に行う電動
カーテン駆動装置などで用いられている。この電動カー
テン駆動装置においては、図３に示すように、速度設定
部１によるカーテンの開閉速度に応じて速度制御部２が
電力増幅部３の制御を行い、直流モータ６にモータ電流
を供給している。そして、モータ電流Ｉｍを検出部４で
検出し、この検出部４の出力をＦＶ変換部５を介して速
度制御部２にフィードバックし、カーテンの開閉速度を
一定に制御している。さらに、詳しくは、速度設定部１
からは設定速度に応じた電圧信号Ｖｒが出力され、カレ
ントトランスなどで構成される検出部５では、図４（ｂ
）に示すように、直流モータ６に流れる同図（ａ）に示
すモータ電流Ｉｍの周期的変化に応じた検出信号Ｖｐを
出力し、ＦＶ変換部５で同図（ｃ）に示すように検出信
号Ｖｐを電圧信号Ｖｓに変換し、この電圧信号Ｖｓと上
記電圧信号Ｖｒを速度制御部２で比較した電圧信号（Ｖ
ｒ−Ｖｓ）を電力増幅部３に与えて、その電圧信号（Ｖ
ｒ−Ｖｓ）に応じて電力増幅部３がモータ電流Ｉｍを適
当に調整してモータ速度を設定値に対応して一定値に制
御している。
【発明が解決しようとする課題】ところが、この種の直
流モータ６を使用した電動カーテン駆動装置では、走行
中に直流モータ６のブラシと整流子との瞬間的な接触不
良が起こり、これにより図５（ａ）に示すモータ電流Ｉ
ｍの落ち込みが発生することがある。なお、ここでブラ
シと整流子との非接触状態を起こす原因は、銅で形成さ
れる整流子の表面に酸化により絶縁層が形成されること
による。この場合、検出部６はその落込み部分も周期的
な電流変化であるとしてＦＶ変換部５に出力するため、
実際のモータ速度と設定速度とに狂いが生じる。このた
め、電圧信号Ｖｒと電圧信号Ｖｓとの対応が狂ってしま
い、その結果カーテンの動きが滑らかに行われず、極端
な場合には途中で停止したりするという問題があった。
【０００３】本発明は上述の点に鑑みて為されたもので
あり、その目的とするところは、ブラシと整流子との瞬
間的な接触不良を防止して、モータ速度を安定させるこ
とができるモータ駆動装置を提供することにある。
【０００４】
【課題を解決するための手段】本発明では、上記目的を
達成するために、電流変化の周期よりも十分に高い周波
数の高周波信号をモータ電流供給手段に供給してモータ
電流を高周波信号で変調する変調手段を備え、周波数／
電圧変換手段に上記変調信号を除去するフィルタ機能を
持たせてある。
【０００５】
【作用】本発明は、上述のように構成することにより、
モータ電流に高周波の変調をかけてブラシと整流子との
間に瞬時的に過電流を流して、整流子の表面に酸化によ
り形成された絶縁層を破壊し、これによりブラシと整流
子との瞬間的な接触不良を防止し、モータ電流の落ち込
みを無くし、モータ速度を安定させるようにしたもので
ある。そして、周波数／電圧変換手段に上記変調信号を
除去するフィルタ機能を持たせることにより、上記高周
波が速度制御系に影響を与えないようにしたものである
。
【０００６】
【実施例】図１及び図２に本発明の一実施例を示す。本
実施例のモータ駆動装置は、図１に示すように、直流モ
ータ６の励磁相切換時に起こる周期的な電流変化を検出
してモータ速度を検出する速度検出手段としての検出部
４と、この検出部４で検出した電流変化で示された速度
信号を電圧信号に変換する周波数／電圧変換手段として
のＦＶ変換部５と、直流モータ６の速度を設定する速度
設定手段としての速度設定部１と、上記ＦＶ変換部５の
出力を速度設定部１から与えられる電圧信号からなる速
度設定信号と比較する比較手段としての速度制御部２と
、この速度制御部２の比較結果に応じて直流モータ６を
一定のモータ速度とするモータ電流を供給するモータ電
流供給手段としての電力増幅部３とで構成されている。
そして、本実施例の場合には、上記構成に加えて、上記
電流変化の周期よりも十分に高い周波数の高周波信号を
電力増幅部３に供給してモータ電流を高周波信号で変調
する変調手段としての変調部７を設けてある。
【０００７】以下、本実施例の動作を説明する。但し、
本実施例の基本構成である速度制御系の動作は従来技術
の項で説明した動作と同じであるので説明は省略し、本
実施例の特徴とする動作についてのみ説明する。本実施
例の新たに追加された変調部７では直流モータ６の励磁
相切換周期に対して十分に高い周波数で図２に示すよう
にモータ電流Ｉｍを変調する。なお、図５に示す高周波
で変調をかけたモータ電流Ｉｍのピーク値は定格値を越
えるように設定し、且つモータ電流Ｉｍの平均値は変調
をかけない場合とほぼ同じになるように設定してある。
また、上記変調部７でモータ電流Ｉｍを変調する高周波
は実際の直流モータ６の駆動時には発生しない周波数で
ある必要がある。このようにモータ電流Ｉｍに高周波で
変調をかけると、ブラシと整流子との間に瞬時的に過電
流が流れる。このため、整流子の表面に酸化により形成
された絶縁層を破壊することができ、ブラシと整流子と
の瞬間的な接触不良を防止できる。従って、モータ電流
Ｉｍに図５（ａ）に示す落ち込みが発生せず、モータ電
流Ｉｍの周期的な電流変化とモータ速度とが一致し、モ
ータ速度を安定させることができる。
【０００８】ところで、上述のように高周波でモータ電
流Ｉｍに変調をかけると、高周波の影響が速度制御系に
及ぶ。従って、本実施例ではＦＶ変換部５に上記変調信
号を除去するフィルタ機能を持たせてある。例えば、Ｆ
Ｖ変換部５に上記高周波成分を除去する帯域フィルタを
追加すればよい。このようにすれば、ＦＶ変換部５から
はモータ電流Ｉｍの電流変化に応じた電圧信号だけを速
度制御部２に与えることができ、高周波成分が速度制御
系に影響を与えることを防止できる。
【０００９】
【発明の効果】本発明は上述のように、電流変化の周期
よりも十分に高い周波数の高周波信号をモータ電流供給
手段に供給してモータ電流を高周波信号で変調する変調
手段を備えているので、ブラシと整流子との間に高周波
成分により瞬時的に過電流を流して、整流子の表面に酸
化により形成された絶縁層を破壊することができ、この
ためブラシと整流子との瞬間的な接触不良を防止でき、
従ってモータ電流の落ち込みが発生せず、モータ速度を
安定に制御できる。また、周波数／電圧変換手段に上記
変調信号を除去するフィルタ機能を持たせてあるので、
周波数／電圧変換手段がモータ電流の電流変化に応じた
電圧信号だけを比較手段に与えることができ、上記高周
波が速度制御系に影響を与えることがない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing malfunction of a motor drive device that drives a DC motor at a constant speed. 2. Description of the Related Art A motor drive device that drives a DC motor at a constant speed is used, for example, in an electric curtain drive device that automatically opens and closes curtains. In this electric curtain driving device, as shown in FIG. 3, a speed control section 2 controls a power amplification section 3 according to the opening/closing speed of the curtain by a speed setting section 1, and supplies motor current to a DC motor 6. ing. The motor current Im is detected by the detection section 4, and the output of the detection section 4 is fed back to the speed control section 2 via the FV conversion section 5, thereby controlling the opening/closing speed of the curtain to be constant. For more details, see speed setting section 1.
A voltage signal Vr corresponding to the set speed is output from the detector 5, which is configured by a current transformer,
), a detection signal Vp corresponding to periodic changes in the motor current Im flowing through the DC motor 6 shown in FIG. A voltage signal (V
r-Vs) to the power amplification section 3, and the voltage signal (V
r-Vs), the power amplifying section 3 appropriately adjusts the motor current Im to control the motor speed to a constant value in accordance with the set value. However, in an electric curtain drive device using this type of DC motor 6, instantaneous contact failure between the brushes of the DC motor 6 and the commutator occurs during running, which causes problems in the figure. Motor current I shown in 5(a)
A drop in m may occur. Note that the cause of the non-contact state between the brush and the commutator is that an insulating layer is formed by oxidation on the surface of the commutator made of copper. In this case, since the detection unit 6 outputs the drop portion to the FV conversion unit 5 as a periodic current change,
A discrepancy occurs between the actual motor speed and the set speed. For this reason, the correspondence between the voltage signal Vr and the voltage signal Vs becomes out of order, and as a result, there is a problem in that the curtain does not move smoothly, and in extreme cases, it may stop midway. The present invention has been made in view of the above points, and its purpose is to prevent momentary contact failure between the brush and the commutator, thereby stabilizing the motor speed. An object of the present invention is to provide a motor drive device. Means for Solving the Problems In the present invention, in order to achieve the above object, a high frequency signal having a frequency sufficiently higher than the period of current change is supplied to the motor current supply means to increase the motor current at high frequency. Equipped with a modulation means for modulating the signal, the frequency/
The voltage conversion means is provided with a filter function for removing the modulation signal. [Operation] The present invention has the above-described structure, and thereby
High-frequency modulation is applied to the motor current to instantaneously cause an overcurrent to flow between the brushes and the commutator, destroying the insulating layer formed by oxidation on the surface of the commutator. This prevents momentary contact failures, eliminates drops in motor current, and stabilizes motor speed. By providing the frequency/voltage conversion means with a filter function for removing the modulation signal, the high frequency is prevented from affecting the speed control system. [Embodiment] An embodiment of the present invention is shown in FIGS. 1 and 2. As shown in FIG. 1, the motor drive device of this embodiment includes a detection section 4 as a speed detection means for detecting the motor speed by detecting periodic current changes that occur when switching the excitation phase of the DC motor 6; An FV conversion unit 5 as a frequency/voltage conversion unit that converts a speed signal indicated by a current change detected by the detection unit 4 into a voltage signal, and a speed setting unit 1 as a speed setting unit that sets the speed of the DC motor 6. , a speed control section 2 as a comparison means for comparing the output of the FV conversion section 5 with a speed setting signal consisting of a voltage signal given from the speed setting section 1; 6 as a motor current supply means for supplying a motor current to maintain a constant motor speed. In the case of this embodiment, in addition to the above-mentioned configuration, a modulation means for supplying a high-frequency signal with a frequency sufficiently higher than the cycle of the current change to the power amplifying section 3 to modulate the motor current with the high-frequency signal is provided. A modulation section 7 is provided. The operation of this embodiment will be explained below. however,
Since the operation of the speed control system, which is the basic configuration of this embodiment, is the same as that described in the section of the prior art, the explanation will be omitted, and only the characteristic operation of this embodiment will be explained. The newly added modulating section 7 of this embodiment modulates the motor current Im at a frequency sufficiently high with respect to the excitation phase switching period of the DC motor 6, as shown in FIG. Note that the peak value of the motor current Im modulated with high frequency shown in Fig. 5 is set to exceed the rated value, and the average value of the motor current Im is set to be approximately the same as when no modulation is applied. There is. Furthermore, the high frequency that modulates the motor current Im in the modulation section 7 needs to be a frequency that does not occur when the DC motor 6 is actually driven. When the motor current Im is modulated at high frequency in this way, an overcurrent instantaneously flows between the brush and the commutator. Therefore, the insulating layer formed on the surface of the commutator by oxidation can be destroyed, and instantaneous poor contact between the brush and the commutator can be prevented. Therefore, the dip shown in FIG. 5A does not occur in the motor current Im, and the periodic current change in the motor current Im matches the motor speed, making it possible to stabilize the motor speed. By the way, when the motor current Im is modulated with a high frequency as described above, the influence of the high frequency is exerted on the speed control system. Therefore, in this embodiment, the FV converter 5 is provided with a filter function for removing the modulated signal. For example, F
A bandpass filter that removes the high frequency components may be added to the V converter 5. In this way, the FV converter 5 can give only the voltage signal corresponding to the current change of the motor current Im to the speed controller 2, and it is possible to prevent high frequency components from affecting the speed control system. [0009] As described above, the present invention includes modulation means for supplying a high frequency signal with a frequency sufficiently higher than the period of current change to the motor current supply means to modulate the motor current with the high frequency signal. Therefore, an overcurrent can be instantaneously caused by high frequency components to flow between the brushes and the commutator, and the insulating layer formed by oxidation on the surface of the commutator can be destroyed. can prevent momentary contact failure,
Therefore, the motor current does not drop, and the motor speed can be stably controlled. In addition, since the frequency/voltage conversion means has a filter function that removes the modulation signal,
The frequency/voltage conversion means can provide the comparison means with only a voltage signal corresponding to a change in the motor current, and the high frequency does not affect the speed control system.
【図１】本発明の一実施例の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
【図２】同上のモータ電流の波形図である。FIG. 2 is a waveform diagram of the motor current same as above.
【図３】従来例の構成を示すブロック図である。FIG. 3 is a block diagram showing the configuration of a conventional example.
【図４】同上の基本動作の説明図である。FIG. 4 is an explanatory diagram of the basic operation same as above.
【図５】同上の問題点の説明図である。FIG. 5 is an explanatory diagram of the problem same as the above.
１ 速度設定部 ２ 速度制御部 ３ 電力増幅部 ４ 検出部 ５ ＦＶ変換部 ６ 直流モータ ７ 変調部 1 Speed setting section 2 Speed control section 3 Power amplification section 4 Detection section 5 FV conversion section 6 DC motor 7 Modulation section
Claims (1)
期的な電流変化を検出してモータ速度を検出する速度検
出手段と、この速度検出手段で検出した電流変化で示さ
れた速度信号を電圧信号に変換する周波数／電圧変換手
段と、直流モータの速度を設定する速度設定手段と、上
記周波数／電圧変換手段の出力を速度設定手段から与え
られる電圧信号からなる速度設定信号と比較する比較手
段と、この比較手段の比較結果に応じて直流モータを一
定のモータ速度とする電流を供給するモータ電流供給手
段と、上記電流変化の周期よりも十分に高い周波数の高
周波信号をモータ電流供給手段に供給してモータ電流を
高周波信号で変調する変調手段とを備え、上記周波数／
電圧変換手段に上記変調信号を除去するフィルタ機能を
持たせて成ることを特徴とするモータ駆動装置。1. Speed detection means for detecting the motor speed by detecting periodic current changes that occur when switching the excitation phase of a DC motor, and a speed signal indicated by the current change detected by the speed detection means as a voltage signal. a speed setting means for setting the speed of the DC motor; and a comparison means for comparing the output of the frequency/voltage conversion means with a speed setting signal consisting of a voltage signal given from the speed setting means. , a motor current supply means for supplying a current to maintain the DC motor at a constant motor speed according to the comparison result of the comparison means; and a high frequency signal having a frequency sufficiently higher than the cycle of the current change to the motor current supply means. modulating means for modulating the motor current with a high frequency signal,
A motor drive device characterized in that the voltage conversion means has a filter function for removing the modulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3093789A JP2858989B2 (en) | 1991-04-24 | 1991-04-24 | Motor drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3093789A JP2858989B2 (en) | 1991-04-24 | 1991-04-24 | Motor drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04325890A true JPH04325890A (en) | 1992-11-16 |
| JP2858989B2 JP2858989B2 (en) | 1999-02-17 |
Family
ID=14092185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3093789A Expired - Lifetime JP2858989B2 (en) | 1991-04-24 | 1991-04-24 | Motor drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2858989B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010110152A (en) * | 2008-10-31 | 2010-05-13 | Aisan Ind Co Ltd | Controller to control motor for fuel pump |
| US20130279960A1 (en) * | 2012-04-20 | 2013-10-24 | Konica Minolta, Inc. | Image forming apparatus |
-
1991
- 1991-04-24 JP JP3093789A patent/JP2858989B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010110152A (en) * | 2008-10-31 | 2010-05-13 | Aisan Ind Co Ltd | Controller to control motor for fuel pump |
| US20130279960A1 (en) * | 2012-04-20 | 2013-10-24 | Konica Minolta, Inc. | Image forming apparatus |
| US9056493B2 (en) * | 2012-04-20 | 2015-06-16 | Konica Minolta, Inc. | Image forming apparatus which performs a cleaning operation to remove a film deposited in a motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2858989B2 (en) | 1999-02-17 |
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