JPS63198523A - Brushless dc motor protector - Google Patents
Brushless dc motor protectorInfo
- Publication number
- JPS63198523A JPS63198523A JP62027404A JP2740487A JPS63198523A JP S63198523 A JPS63198523 A JP S63198523A JP 62027404 A JP62027404 A JP 62027404A JP 2740487 A JP2740487 A JP 2740487A JP S63198523 A JPS63198523 A JP S63198523A
- Authority
- JP
- Japan
- Prior art keywords
- current
- motor
- transistors
- detection device
- brushless
- 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
- 230000001012 protector Effects 0.000 title 1
- 238000001514 detection method Methods 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 11
- 230000015556 catabolic process Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Protection Of Generators And Motors (AREA)
- Protection Of Static Devices (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、エアコンの室外機等に用いられるブラシレス
直流モータのトランジスタ、ダイオードを保護する装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for protecting transistors and diodes of brushless DC motors used in outdoor units of air conditioners and the like.
（従来の技術）
従来のこの種ブラシレス直流モータは、出力シャフトは
ロータコアに圧入されて直結されており、その駆動回路
は一般に第４図に示すようになっている。ｌａ、ｌｂ、
ｌｃはモータ巻線、２はロータ、３ａ。(Prior Art) In a conventional brushless DC motor of this type, the output shaft is press-fitted into the rotor core and directly connected thereto, and its drive circuit is generally as shown in FIG. 4. la, lb,
lc is a motor winding, 2 is a rotor, and 3a.
３ｂ、３ｃ、３ｄ、３ｅ、３ｆはトランジスタ、 ４ａ
、４ｂ、４ｃ、４ｄ、４ｅ。3b, 3c, 3d, 3e, 3f are transistors, 4a
, 4b, 4c, 4d, 4e.
４ｆはダイオードである。4f is a diode.
（発明が解決しようとする問題点）
空気調和機の室外機は、風通しのよいところを選んで設
置されることにより自然の風を直ちに受ける場所である
ことが多く、風のためファンが回転し、従ってモータが
回転してしまう。外力によリモータが回転している時の
ある瞬間には、第４図においてトランジスタ３ａと３８
がオン、あとは全てオフとなる。ロータ２の正転のとき
に発生する電圧Ｖがモータ巻線ｌａ側を＋、 ｌｂ側を
−となるように発生すると、ダイオード４ｂを通して電
源側に電圧が供給される。ロータの正転時は、電圧の上
昇だけで大きな問題にならないが、この同一瞬間、ロー
タが逆転していたとすると発生する電圧Ｖ ｘ −ｚは
逆の電圧となり、第４図の破線で示すようにトランジス
タ３ｅ→ダイオード４ｄと短絡電流が流れてしまう。(Problem to be solved by the invention) The outdoor unit of an air conditioner is often installed in a well-ventilated place so that it receives natural wind immediately, and the fan does not rotate due to the wind. , so the motor will rotate. At a certain moment when the remoter is rotating due to an external force, transistors 3a and 38 in FIG.
is on, and everything else is off. When the voltage V generated during normal rotation of the rotor 2 is generated so that the motor winding la side is positive and the lb side is negative, the voltage is supplied to the power supply side through the diode 4b. When the rotor rotates in the forward direction, it is not a big problem because the voltage only increases, but if the rotor were to rotate in the reverse direction at this same moment, the voltage V x −z that would be generated would be the opposite voltage, as shown by the broken line in A short circuit current flows from the transistor 3e to the diode 4d.
さらに台風時のような強風時にはファンが受ける力が大
きくなってモータの回転数が上がり、逆回転では短絡電
流が増大してトランジスタ、ダイオード等を破壊すると
いう重大な問題が生じた。Furthermore, when there are strong winds such as during a typhoon, the force exerted on the fan increases, causing the motor to rotate at a higher speed.If the fan rotates in the opposite direction, short-circuit current increases, causing damage to transistors, diodes, etc.
本発明は上記の点にかんがみ、短絡電流がトランジスタ
等を破壊する電流値に至らない前に全トランジスタへの
通電を遮断して短絡電流による破壊をなくすることを目
的とするものである。In view of the above points, it is an object of the present invention to eliminate the damage caused by the short circuit current by cutting off current to all transistors before the short circuit current reaches a current value that would destroy the transistors, etc.
（問題点を解決するため９手段）
そこで本発明は、モータの巻線電流を検出し該巻線電流
が一定値を超えたときに信号を発生する電流検出装置を
設け、該電流検出装置が発生した信号によりモータ駆動
制御装置はモータ駆動回路のトランジスタの全てをオフ
状態にするようにしたものである。(9 Means for Solving the Problems) Therefore, the present invention provides a current detection device that detects the winding current of the motor and generates a signal when the winding current exceeds a certain value, and the current detection device The motor drive control device turns off all the transistors in the motor drive circuit based on the generated signal.
（作 用）
強風等の外力によりモータの逆回転して短絡電流が生じ
、その短絡電流が一定値を超えたとき電流検出装置が信
号を発生し、その信号によりモータ駆動制御装置がモー
タ駆動回路のトランジスタの全てをオフ状態にするよう
にするので、信号を発生する短絡電流をトランジスタ、
ダーｒオードの破壊電流より小さい値にすることで、こ
れら半導体の破壊を防ぐ。(Function) External forces such as strong winds cause the motor to rotate in reverse, creating a short-circuit current. When the short-circuit current exceeds a certain value, the current detection device generates a signal, which causes the motor drive control device to control the motor drive circuit. Since all of the transistors in the transistor are turned off, the short circuit current that generates the signal is transferred to the transistor,
Destruction of these semiconductors can be prevented by making the value smaller than the breakdown current of the diode.
（実施例）
第１図は本発明の実施例を示し、第４図に示した従来の
ものと同様の構成部分は同一符号で表わす。６は電流検
出装置であって、モータ接続線５の電流すなわちモータ
の巻線電流を検出する電流検出器７と、この電流検出器
７の検出した電流値が一定値を超したとき信号を発生す
る電流値処理装置８とよりなっている。９はモータの位
相検出装置、ｌＯはトランジスタ３８〜３ｆを制御する
モータ駆動制御装置であって、このモータ駆動制御装置
１０は電流検出装置６からの信号が入力する駆動停止入
力端子１１を有し、巻線電流が一定値を超えたとき電流
検出装置６より発した信号により機能を停止しトランジ
スタ３８〜３ｆを全てオフ状態にする。(Embodiment) FIG. 1 shows an embodiment of the present invention, and the same components as those of the conventional one shown in FIG. 4 are denoted by the same reference numerals. Reference numeral 6 denotes a current detection device, which includes a current detector 7 that detects the current in the motor connection line 5, that is, the motor winding current, and generates a signal when the current value detected by the current detector 7 exceeds a certain value. It consists of a current value processing device 8. Reference numeral 9 denotes a motor phase detection device, and lO denotes a motor drive control device that controls transistors 38 to 3f. This motor drive control device 10 has a drive stop input terminal 11 into which a signal from the current detection device 6 is input. When the winding current exceeds a certain value, the function is stopped by a signal issued from the current detection device 6, and all transistors 38 to 3f are turned off.
第２図は、風によるモータの回転数Ｎと、短絡電流工、
どの関係および通常のヒータ運転時の回転数Ｎと通常運
転電流工との関係を示し、回転数Ｎ。Figure 2 shows the rotational speed N of the motor due to the wind, the short-circuit electric current,
Which relationship is shown and the relationship between the rotation speed N during normal heater operation and the normal operating electrician, and the rotation speed N.
のとき短絡電流工、が流れ、この点で前述のトランジス
タ、ダイオードを破壊してしまう０通常の運転回転時の
回転数ＮＩＩでの運転電流は工、である、そこで電流検
出装置６は通常運転電流エヨと破壊電流ＩＩｌとの間の
電流値工。を超した時に信号を発生しくＳｌ）、この信
号を受けたモータ駆動制御装置は全てのトランジスタへ
のオン信号を遮断してオフ状態にしくＳ２）、タイマー
に、より一定時間待機する（Ｓ３）。一定時間経過後に
再びモータ駆動制御装置１０を起動しくＳ４）、電流検
出を行なう（Ｓ、）。電流値工。以下の場合は通常運転
をする（Ｓ６）。When , a short circuit current flows, which destroys the transistors and diodes mentioned above.The operating current at the rotation speed NII during normal operation is . Therefore, the current detection device 6 is operated normally. Current value between current Eyo and breakdown current IIl. SL), the motor drive control device that receives this signal cuts off the ON signals to all transistors to turn them OFF (S2), and waits for a certain period of time according to the timer (S3). . After a certain period of time has elapsed, the motor drive control device 10 is started again (S4), and current detection is performed (S,). Current value engineer. In the following cases, normal operation is performed (S6).
第３図には上記の流れ図を示している。FIG. 3 shows the above flowchart.
（発明の効果）
以上のように本発明は、電流検出装置により巻線電流を
検出して該電流が一定値を超したときに信号を発し、こ
の信号でモータ駆動制御装置がモータ駆動回路の全ての
トランジスタをオフ状態にするようにしたことで、電流
検出装置からの信号が巻線電流をトランジスタ、ダイオ
ード等の破壊電流以下で発生するようにしておけば、室
外に設置されるエアコンの室外機等に用いられるモータ
の台風等の状況下における保護はを確実に行なうことが
できる。また電流検出装置を設け、モータ駆動制御装置
を電流検出装置の出力信号で作動するだけの簡単な構成
で実現できる。モしてモータ部分単独で動作をするので
、他の制御の変更を必要としなく、安価な構成で、信頼
性の高い保護ができる。(Effects of the Invention) As described above, the present invention detects a winding current using a current detection device, issues a signal when the current exceeds a certain value, and uses this signal to cause a motor drive control device to control a motor drive circuit. By turning off all transistors, if the signal from the current detection device is generated so that the winding current is below the breakdown current of transistors, diodes, etc., the outdoor air conditioner installed outdoors can be Motors used in aircraft, etc. can be reliably protected under conditions such as typhoons. Further, it is possible to implement the present invention with a simple configuration in which a current detection device is provided and the motor drive control device is operated by an output signal from the current detection device. Since the motor part operates independently, there is no need to change other controls, and highly reliable protection can be achieved with an inexpensive configuration.
第１図は本発明の実施例の回路図、第２図はモータの回
転数と短絡電流および通常の運転電流との関係を示す特
性図、第３図は本発明装置の動作の流れ図、第４図は従
来のブラシレス直流モータの回路図を示す。
１ａ＝１ｃ・・・モータ巻線、３ａ〜３ｆ・・・ トラ
ンジスタ、 ４ａ〜４ｆ・・・ダイオード、 ６・・
・電流検出装置、１０・・・モータ駆動制御装置。
第２図
口転衷Ｎ
第３図
第４図Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between motor rotation speed, short-circuit current, and normal operating current, Fig. 3 is a flowchart of the operation of the device of the present invention, Figure 4 shows a circuit diagram of a conventional brushless DC motor. 1a=1c...Motor winding, 3a-3f...Transistor, 4a-4f...Diode, 6...
- Current detection device, 10... motor drive control device. Figure 2 Mouth transfer N Figure 3 Figure 4
Claims (1)
とき信号を発生する電流検出装置を設け、該電流検出装
置が発生した信号によってモータ駆動制御装置はモータ
駆動回路のトランジスタの全てをオフ状態にするように
したことを特徴とするブラシレス直流モータ保護装置。A current detection device is provided that detects the winding current of the motor and generates a signal when the winding current exceeds a certain value, and the motor drive control device uses the signal generated by the current detection device to control all of the transistors in the motor drive circuit. A brushless DC motor protection device characterized in that the brushless DC motor is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62027404A JPS63198523A (en) | 1987-02-10 | 1987-02-10 | Brushless dc motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62027404A JPS63198523A (en) | 1987-02-10 | 1987-02-10 | Brushless dc motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63198523A true JPS63198523A (en) | 1988-08-17 |
Family
ID=12220133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62027404A Pending JPS63198523A (en) | 1987-02-10 | 1987-02-10 | Brushless dc motor protector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63198523A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588388A2 (en) * | 1988-08-30 | 1994-03-23 | Fuji Electric Co., Ltd. | Current-limiting system for voltage-type inverter |
-
1987
- 1987-02-10 JP JP62027404A patent/JPS63198523A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588388A2 (en) * | 1988-08-30 | 1994-03-23 | Fuji Electric Co., Ltd. | Current-limiting system for voltage-type inverter |
| EP0588388A3 (en) * | 1988-08-30 | 1994-04-13 | Fuji Electric Co., Ltd. | Current-limiting system for voltage-type inverter |
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