JPH01126131A - Overload detection circuit for rotational speed controller - Google Patents
Overload detection circuit for rotational speed controllerInfo
- Publication number
- JPH01126131A JPH01126131A JP28280487A JP28280487A JPH01126131A JP H01126131 A JPH01126131 A JP H01126131A JP 28280487 A JP28280487 A JP 28280487A JP 28280487 A JP28280487 A JP 28280487A JP H01126131 A JPH01126131 A JP H01126131A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- comparator
- temperature
- overload
- control device
- 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 title claims description 29
- 230000005855 radiation Effects 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 238000013021 overheating Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は回転電機の回転速度制御装置の過負荷検出回
路において、制御装置の温度が上昇するほど過負荷検出
時間を短くしてオペアンプの加熱を防止することができ
るようにしたものに関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an overload detection circuit for a rotational speed control device for a rotating electrical machine, and the overload detection time is shortened as the temperature of the control device rises to prevent overheating of the operational amplifier. Regarding things that can be prevented.
回転電機の回転速度制御装置では過負荷による過熱を防
止するために一般に放熱部の温度を検出するとともに回
転電機の一定値以上の入力電流の一定時間の継続により
過負荷を検出するようにしていた。前記回転電機の電流
と過負荷検出時間の関係は反限時特性で電流が増すほど
検出時間が短くなるようになっている。In order to prevent overheating due to overload, rotational speed control devices for rotating electric machines generally detect the temperature of the heat dissipation section and detect overload by continuation of an input current of a certain value or more to the rotating electric machine for a certain period of time. . The relationship between the current of the rotating electric machine and the overload detection time is an inverse time limit characteristic, and the detection time becomes shorter as the current increases.
前記構造では過負荷検出時間と電流の関係は反限時特性
で問題ないが放熱部の温度との関係は加熱状態であって
も一定であるので制御装置の温度余裕を増す必要があり
、これにより制御装置全体が大形化して高価になるとい
う欠点があった。In the above structure, the relationship between the overload detection time and the current is an inverse time limit characteristic, so there is no problem, but the relationship with the temperature of the heat dissipation part remains constant even in the heated state, so it is necessary to increase the temperature margin of the control device. The disadvantage is that the entire control device becomes large and expensive.
この発明は前記の欠点を除去するために°、制御装置の
温度が上昇するほど過負荷検出時間を短くしてオペアン
プの過熱を防止することができるようにした回転速度制
御装置の過負荷検出回路を提供することを目的とする。In order to eliminate the above-mentioned drawbacks, the present invention provides an overload detection circuit for a rotational speed control device that can prevent overheating of an operational amplifier by shortening the overload detection time as the temperature of the control device rises. The purpose is to provide
この発明は前記の目的を達成するために、回転電機の入
力電圧で回転速度を制御する制御装置の放熱部に温度検
出素子１を取付け、この温度検出素子１を接続して前記
放熱部の温度が上昇するとしきい値の低下するコンパレ
ータ２に制御装置のオペアンプ３の出力側を接続し、前
記コンパレータ２の出力電圧でオペアンプ３の過負荷を
検出するようにしたものである。In order to achieve the above-mentioned object, the present invention attaches a temperature detection element 1 to a heat radiation part of a control device that controls the rotation speed using an input voltage of a rotating electric machine, and connects this temperature detection element 1 to detect the temperature of the heat radiation part. The output side of the operational amplifier 3 of the control device is connected to a comparator 2 whose threshold value decreases when the voltage increases, and an overload of the operational amplifier 3 is detected based on the output voltage of the comparator 2.
前記コンパレータ２は制御装置の放熱部の温度が上昇す
るほどしきい値が低下して過負荷検出時間を短くするこ
とができる。The threshold value of the comparator 2 decreases as the temperature of the heat dissipation section of the control device increases, so that the overload detection time can be shortened.
第１図はこの発明の実施例を示すもので、図示しない回
転電機が入力電圧を制御することにより回転速度制御さ
れ、入力電流を検出する図示しない電流検出回路からの
出力電圧Ｅｌ （極性マイナス）をオペアンプ３のマ
イナス端子に抵抗Ｒ，を介して入力するようになってい
る。前記電圧Ｅ。FIG. 1 shows an embodiment of the present invention, in which a rotating electric machine (not shown) is controlled in rotational speed by controlling an input voltage, and an output voltage El (minus polarity) from a current detection circuit (not shown) that detects the input current. is input to the negative terminal of the operational amplifier 3 via a resistor R. Said voltage E.
の絶対値は回転電機の入力電流に比例して増減し、交流
サーボモータでは入力電流を全波整流したものと比例し
た値になる。前記オペアンプ３のマイナス端子には抵抗
Ｒ２を介して電圧の制御基準値Ｅ ｓ＊Ｌが入力され、
このマイナス端子とオペアンプ３の出力側とはコンデン
サＣを介して接続されている。前記電圧の制御基準値Ｅ
３゜１は回転電機および制御装置の過負荷レベルを設定
するためのしきい値である。したがってオペアンプ３の
マイナス端子（反転入力端子）への入力電流はオペアン
プ３が飽和していない状態では
力電圧Ｅ。Ｕ、は時間をｔとすれば
前記オペアンプ３の出力側はコンパレータ２のマイナス
端子（反転入力端子）に接続され、コンパレータ２のプ
ラス端子（非反転入力端子）には図示しない制御装置の
例えば放熱フィン部に取付けたＰＴＣサーミスタ（正特
性サーミスタ）等の温度検出素子１とこれに直列接続し
た抵抗Ｒ４との接続点が接続されている。前記温度検出
素子１と抵抗Ｒ４には安定化電源Ｅ３から正電圧が印加
され、コンパレータ２にしきい値を与えるようになって
いる。このしきい値Ｅ３１は温度検出素子１の抵抗ＲＰ
ｒｅと抵抗Ｒ１の分圧値でありオペアンプ３の出力電圧
Ｅ。Ｕ？が前記しきい値Ｅｓ＋より大きくなるとコンパ
レータ２の出力電圧がＬ（ローレベル）となってオペア
ンプ３の過負荷を検出し、信号を図示しない過負荷処理
回路に送るようになっている。The absolute value of increases or decreases in proportion to the input current of a rotating electrical machine, and in the case of an AC servo motor, the absolute value of is proportional to the full-wave rectification of the input current. A voltage control reference value Es*L is input to the negative terminal of the operational amplifier 3 via a resistor R2,
This negative terminal and the output side of the operational amplifier 3 are connected via a capacitor C. Control reference value E of the voltage
3°1 is a threshold value for setting the overload level of the rotating electric machine and the control device. Therefore, the input current to the negative terminal (inverting input terminal) of the operational amplifier 3 is the voltage E when the operational amplifier 3 is not saturated. U, where time is t, the output side of the operational amplifier 3 is connected to the negative terminal (inverting input terminal) of the comparator 2, and the positive terminal (non-inverting input terminal) of the comparator 2 is connected to a control device (not shown), such as heat radiation. A connection point between a temperature detection element 1 such as a PTC thermistor (positive temperature coefficient thermistor) attached to the fin portion and a resistor R4 connected in series thereto is connected. A positive voltage is applied to the temperature detection element 1 and the resistor R4 from a stabilized power supply E3, so as to provide a threshold value to the comparator 2. This threshold value E31 is the resistance RP of the temperature detection element 1.
The output voltage E of the operational amplifier 3 is the divided voltage value of re and the resistor R1. U? When becomes larger than the threshold value Es+, the output voltage of the comparator 2 becomes L (low level), an overload of the operational amplifier 3 is detected, and a signal is sent to an overload processing circuit (not shown).
前記オペアンプ３の出力電圧Ｅ。ｕｒがコンパレータ２
のしきい値Ｅ３＋になるとオペアンプ３の過負荷を検出
するので過負荷検出時間Ｔは電流に比例する電圧Ｅｌが
増すほど短くなることがわかる。一方前記温度検出素子
１は抵抗ＲＰＴＩ：が制御装置の温度上昇に伴って増す
のでコンパレータ２のしきい値Ｅ！ｌは制御装置の温度
が上昇するほど低下し、これにより過負荷検出時間を短
くしてオペアンプ３の過熱を防止することができる。Output voltage E of the operational amplifier 3. ur is comparator 2
When the threshold value E3+ is reached, overload of the operational amplifier 3 is detected, so it can be seen that the overload detection time T becomes shorter as the voltage El proportional to the current increases. On the other hand, the temperature detection element 1 has a resistance RPTI: which increases as the temperature of the control device increases, so the threshold value E! of the comparator 2! l decreases as the temperature of the control device rises, thereby making it possible to shorten the overload detection time and prevent the operational amplifier 3 from overheating.
前記実施例では温度検出素子１がＰＴＣサーミスタ（正
特性サーミスタ）の場合について説明したが、ＮＴＣサ
ーミスタ（負特性サーミスタ）等の温度検出素子１１を
使用する場合には第２図に示すように安定化電源Ｅ、に
対して温度検出素子１１と分圧抵抗Ｒ１１を逆に直列接
続しその接続点をコンパレータ２のプラス端子（非反転
入力端子）に接続して実施することができる。In the above embodiment, the case where the temperature detection element 1 is a PTC thermistor (positive characteristic thermistor) was explained, but when using the temperature detection element 11 such as an NTC thermistor (negative characteristic thermistor), it is stable as shown in FIG. This can be carried out by connecting the temperature detection element 11 and the voltage dividing resistor R11 in reverse series with respect to the switching power source E, and connecting the connection point to the positive terminal (non-inverting input terminal) of the comparator 2.
この発明によれば回転速度制御装置の過負荷検出回路に
おいて、制御装置の放熱部に温度検出素子を取付け、こ
の温度検出素子を接続して前記放熱部の温度が上昇する
としきい値の低下するコンパレータに制御装置のオペア
ンプの出力側を接続し、前記コンパレータの出力電圧で
オペアンプの過負荷を検出するようにしたので、制御装
置の温度が上昇するほど過負荷検出時間を自動的に短く
して過熱を防止し、これにより装置全体を小形化するこ
とができるという効果が得られる。According to this invention, in the overload detection circuit of a rotation speed control device, a temperature detection element is attached to a heat radiation part of the control device, and when the temperature detection element is connected and the temperature of the heat radiation part increases, the threshold value decreases. The output side of the operational amplifier of the control device is connected to a comparator, and the overload of the operational amplifier is detected using the output voltage of the comparator.As the temperature of the control device increases, the overload detection time is automatically shortened. This has the effect of preventing overheating and thereby making it possible to downsize the entire device.
第１図はこの発明の実施例の要部回路図、第２図はこの
発明の他の実施例の要部回路図である。
１．１１・・・温度検出素子、２・・・コンパレータ、
３・・・オペアンプ。
第２図FIG. 1 is a circuit diagram of a main part of an embodiment of the invention, and FIG. 2 is a circuit diagram of a main part of another embodiment of the invention. 1.11...Temperature detection element, 2...Comparator,
3...Op amp. Figure 2
Claims (1)
の放熱部に温度検出素子を取付け、この温度検出素子を
接続して前記放熱部の温度が上昇するとしきい値の低下
するコンパレータに制御装置のオペアンプの出力側を接
続し、前記コンパレータの出力電圧でオペアンプの過負
荷を検出するようにしたことを特徴とする回転速度制御
装置の過負荷検出回路。1) A temperature detection element is attached to the heat radiation section of a control device that controls the rotation speed using the input voltage of the rotating electric machine, and this temperature detection element is connected to control a comparator whose threshold value decreases when the temperature of the heat radiation section rises. 1. An overload detection circuit for a rotation speed control device, characterized in that an output side of an operational amplifier of the device is connected, and overload of the operational amplifier is detected using the output voltage of the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28280487A JPH01126131A (en) | 1987-11-09 | 1987-11-09 | Overload detection circuit for rotational speed controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28280487A JPH01126131A (en) | 1987-11-09 | 1987-11-09 | Overload detection circuit for rotational speed controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01126131A true JPH01126131A (en) | 1989-05-18 |
Family
ID=17657305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28280487A Pending JPH01126131A (en) | 1987-11-09 | 1987-11-09 | Overload detection circuit for rotational speed controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01126131A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557058A (en) * | 2019-08-29 | 2019-12-10 | 西安法士特汽车传动有限公司 | starting protection method and circuit for direct-current brushless motor |
-
1987
- 1987-11-09 JP JP28280487A patent/JPH01126131A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110557058A (en) * | 2019-08-29 | 2019-12-10 | 西安法士特汽车传动有限公司 | starting protection method and circuit for direct-current brushless motor |
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