JPH05308794A - Motor anomaly detection circuit - Google Patents
Motor anomaly detection circuitInfo
- Publication number
- JPH05308794A JPH05308794A JP4109449A JP10944992A JPH05308794A JP H05308794 A JPH05308794 A JP H05308794A JP 4109449 A JP4109449 A JP 4109449A JP 10944992 A JP10944992 A JP 10944992A JP H05308794 A JPH05308794 A JP H05308794A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- winding
- abnormality
- detection circuit
- microprocessor
- 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
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、中点結線を有するモー
タの巻線異常またはスイッチング素子異常を検出する、
モータの異常検出回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects winding abnormality or switching element abnormality of a motor having a midpoint connection.
The present invention relates to a motor abnormality detection circuit.
【０００２】[0002]
【従来の技術】従来モータの巻線異常を検出する手段と
して、モータ内部に回転検出用のコイルを設けて、前記
コイルに発生する誘起電圧を利用して検出することが行
われていた。図３は従来の検出方法を示すもので、４，
５はモータ駆動用スイッチング素子、１２はモータ巻
線、１３は回転検出用巻線でモータ巻線と磁気的に結合
されている。１１はロータマグネット、１４はアナログ
処理回路である。モータが正常に回転している時に回転
検出用巻線１３に発生する誘起電圧をアナログ処理し
て、巻線異常の場合との誘起電圧波形を比較すること
で、間接的にモータの巻線異常を検出している。2. Description of the Related Art Conventionally, as a means for detecting a winding abnormality of a motor, a coil for detecting rotation is provided inside the motor and detection is performed by utilizing an induced voltage generated in the coil. FIG. 3 shows a conventional detection method.
Reference numeral 5 is a motor driving switching element, 12 is a motor winding, and 13 is a rotation detecting winding, which is magnetically coupled to the motor winding. Reference numeral 11 is a rotor magnet, and 14 is an analog processing circuit. By indirectly processing the induced voltage generated in the rotation detection winding 13 when the motor is rotating normally and comparing the induced voltage waveform with that in the case of winding abnormality, the winding abnormality of the motor is indirectly Is being detected.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記従来
の構成では、誘起電圧のアナログ処理回路が複雑であ
り、モータ巻線とは別に検出コイルを設けなければなら
ず、コストがかかるという問題点を有していた。However, in the above-mentioned conventional configuration, the analog processing circuit for the induced voltage is complicated, and the detection coil must be provided separately from the motor winding, which causes a problem of high cost. Was.
【０００４】本発明は上記従来の問題点を解決するもの
で、モータコイルの巻線異常，モータ駆動用スイッチン
グ素子異常を検出する回路を提供することを目的とす
る。The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a circuit for detecting an abnormal winding of a motor coil and an abnormal switching element for driving a motor.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するために、非通電巻線に発生する電圧をある特定のタ
イミングで検出し、モータの巻線異常およびスイッチン
グ素子異常を検出するものである。In order to achieve the above object, the present invention detects a voltage generated in a non-conducting winding at a specific timing to detect a winding abnormality and a switching element abnormality of a motor. Is.
【０００６】[0006]
【作用】本発明は上記した構成により、回転検出用巻線
やアナログ処理回路が不要となり、モータの巻線異常検
出，モータ駆動用スイッチング素子の異常検出を簡単に
行うことができる。According to the present invention, the rotation detecting winding and the analog processing circuit are not necessary because of the above-described structure, and the winding abnormality of the motor and the abnormality of the switching element for driving the motor can be easily detected.
【０００７】[0007]
【実施例】以下本発明の一実施例について、図１に基づ
いて説明する。図１において、２０は３相ステッピング
モータで中点結線されている。１〜３はモータのコイル
端子、４，５はモータ駆動用トランジスタで、モータコ
イルの１端子と接続されている。６はダイオードで１コ
イル端子と接続され、整形回路７を介してマイクロプロ
セッサ１０と接続される。８はモータ巻線へ供給される
電圧の中点電位を検出する中点電圧検出回路で、１コイ
ル端子と接続し、整形回路９を介してマイクロプロセッ
サ１０と接続されている。また、マイクロプロセッサ１
０はモータ駆動トランジスタと接続し、ステッピングモ
ータを回転させる励磁信号を送り出している。上記構成
において、その動作を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 20 denotes a three-phase stepping motor, which is connected to the middle point. 1 to 3 are coil terminals of the motor, and 4 and 5 are transistors for driving the motor, which are connected to one terminal of the motor coil. A diode 6 is connected to one coil terminal and is connected to the microprocessor 10 via the shaping circuit 7. Reference numeral 8 denotes a midpoint voltage detection circuit for detecting the midpoint potential of the voltage supplied to the motor winding, which is connected to one coil terminal and is connected to the microprocessor 10 via the shaping circuit 9. Also, the microprocessor 1
0 is connected to the motor drive transistor and sends out an excitation signal for rotating the stepping motor. The operation of the above configuration will be described.
【０００８】３層ステッピングモータをたとえば２相励
磁駆動する際、マイクロプロセッサよりの励磁信号は図
２（ａ），（ｂ）となる。その時刻における１コイル端
子の電位は（ｃ）のようになる。ここで、トランジスタ
４のオン→オフつまりコイル１に電流が流れていて、流
れなくなる瞬間およびトランジスタ５のオン→オフつま
り、コイル１に電流が流れていて流れなくなる瞬間に、
コイル１端子に逆起電圧 ｅ＝Ｌｄｉ／ｄｔ が発生する。ここでＬはコイル１のインダクタンス、ｄ
ｉ／ｄｔはコイル１端子に流れる電流の時間的割合を示
す。この逆起電圧により図２（ｃ）のような電圧波形を
とる。この逆起電圧を含めたコイル１端子の非通電状態
に発生する電圧をダイオード，整形回路を介すること
で、図２（ｄ）の波形を得ることができる。When the three-layer stepping motor is driven by, for example, two-phase excitation, the excitation signals from the microprocessor are as shown in FIGS. 2 (a) and 2 (b). The potential of the one coil terminal at that time is as shown in (c). Here, when the transistor 4 is turned on → off, that is, when the current flows in the coil 1 and stops flowing, and when the transistor 5 is turned on → off, that is, when the current flows in the coil 1 and stops flowing,
A counter electromotive voltage e = Ldi / dt is generated at the coil 1 terminal. Where L is the inductance of coil 1, d
i / dt represents the temporal ratio of the current flowing through the coil 1 terminal. The counter electromotive voltage produces a voltage waveform as shown in FIG. By passing the voltage including the counter electromotive voltage generated in the non-energized state of the coil 1 terminal through the diode and the shaping circuit, the waveform of FIG. 2D can be obtained.
【０００９】マイクロプロセッサよりトランジスタ４の
立下がりを図２（ｅ）のようにモニターし、一定の遅延
時間を持って（ｄ）波形をマイクロプロセッサに取りこ
み状態を比較する。つまり、励磁信号の立下がりに同期
した遅延時間で、コイルの逆起電圧の有無の確認を行
う。巻線異常またはモータ駆動用トランジスタ異常の場
合は、図２（ｆ）のようになり正常時の波形（ｄ）と違
いが明らかになる。The fall of the transistor 4 is monitored by the microprocessor as shown in FIG. 2 (e), and the waveform (d) is taken into the microprocessor with a certain delay time to compare the states. That is, the presence or absence of the back electromotive force of the coil is confirmed with the delay time synchronized with the fall of the excitation signal. When the winding is abnormal or the motor driving transistor is abnormal, the waveform is as shown in FIG. 2F, and the difference from the waveform (d) in the normal state becomes clear.
【００１０】さらに、コイル１端子に電流が流れていな
い時、つまりトランジスタ４，５がともにオフの時は、
モータ巻線の供給電圧の１／２の電圧がコイル１端子に
発生する。これは、残りのコイル２と３が直列に接続さ
れており、各々のコイルに同等の巻線が施されているか
らである。この電圧を中点電圧検出回路８で検出し、波
形整形してマイクロプロセッサに取りこむ。この時の信
号は図２（ｇ）のようになる。（ｅ）に同期した一定の
遅延時間で（ｇ）波形をマイクロプロセッサに取りこみ
状態を比較する。巻線異常，モータ駆動トランジスタ異
常の場合は、図２（ｈ）のような波形が得られ、正常時
の波形（ｇ）と違いが明らかになる。Further, when no current is flowing through the coil 1 terminal, that is, when the transistors 4 and 5 are both off,
A voltage that is half the supply voltage of the motor winding is generated at the coil 1 terminal. This is because the remaining coils 2 and 3 are connected in series, and each coil is provided with an equivalent winding. This voltage is detected by the midpoint voltage detection circuit 8, the waveform is shaped, and the signal is taken into the microprocessor. The signal at this time is as shown in FIG. The waveform (g) is taken into the microprocessor at a constant delay time synchronized with (e) and the states are compared. When the winding is abnormal or the motor drive transistor is abnormal, the waveform as shown in FIG. 2 (h) is obtained, and the difference from the waveform (g) in the normal state becomes clear.
【００１１】[0011]
【発明の効果】以上の実施例から明らかなように、本発
明によれば中点結線を有する多相モータで、非通電巻線
に発生する電圧、つまり逆起電圧成分とコイル供給電圧
の中点電圧を検出することで、モータの巻線異常，スイ
ッチング素子異常を極めて簡易な回路構成で確実に検出
できる。As is apparent from the above embodiments, according to the present invention, in a multi-phase motor having a midpoint connection, the voltage generated in the non-conducting winding, that is, the back electromotive voltage component and the coil supply voltage By detecting the point voltage, abnormal windings of the motor and abnormal switching elements can be reliably detected with an extremely simple circuit configuration.
【図１】本発明の実施例におけるモータ巻線異常、およ
びスイッチング素子異常を検出する回路ブロック図FIG. 1 is a circuit block diagram for detecting a motor winding abnormality and a switching element abnormality according to an embodiment of the present invention.
【図２】本発明の実施例における要部波形図FIG. 2 is a waveform diagram of essential parts in an embodiment of the present invention.
【図３】従来の巻線異常を検出する回路ブロック図FIG. 3 is a circuit block diagram of a conventional winding abnormality detection circuit.
１ コイルの１端子 ２ コイルの２端子 ３ コイルの３端子 ４，５ モータ駆動用トランジスタ ６ ダイオード ７，９ 整形回路 ８ 中点電圧検出回路 １０ マイクロプロセッサ １１ ロータマグネット １２ モータ巻線 １３ 回転検出用巻線 １４ アナログ処理回路 ２０ ３相ステッピングモータ 1 1 terminal of coil 2 terminal of 2 coil 3 terminal of 3 coil 4,5 Motor drive transistor 6 Diode 7,9 Shaping circuit 8 Midpoint voltage detection circuit 10 Microprocessor 11 Rotor magnet 12 Motor winding 13 Winding for rotation detection Line 14 Analog processing circuit 20 3-phase stepping motor
Claims (5)
非通電巻線に発生する電圧を測定し、巻線異常およびス
イッチング素子異常を判断するモータの異常検出回路。1. A polyphase motor having a midpoint connection,
A motor abnormality detection circuit that measures the voltage generated in the non-energized winding and determines winding abnormality and switching element abnormality.
切り換わった時、前記巻線に発生する電圧を測定し、モ
ータの巻線異常およびスイッチング素子異常を判断する
請求項１記載のモータの異常検出回路。2. The motor according to claim 1, wherein when one winding is switched from the energized state to the non-energized state, the voltage generated in the winding is measured to determine the winding abnormality and the switching element abnormality of the motor. Motor abnormality detection circuit.
オードで接続し、前記マイクロプロセッサよりモータ巻
線への電源供給信号と、ダイオードを介してマイクロプ
ロセッサに至る信号とを、前記マイクロプロセッサにて
ある特定の遅延時間をもって比較する請求項２記載のモ
ータの異常検出回路。3. One winding and a microprocessor are connected by a diode, and the microprocessor supplies a power supply signal from the microprocessor to the motor winding and a signal reaching the microprocessor via the diode. The motor abnormality detection circuit according to claim 2, wherein the comparison is performed with a specific delay time.
電源供給信号と、前記モータ巻線へ供給される電圧の中
点電圧とを比較する請求項３記載のモータの異常検出回
路。4. The motor abnormality detection circuit according to claim 3, wherein a power supply signal from the microprocessor to the motor winding is compared with a midpoint voltage supplied to the motor winding.
切り換わった時、前記巻線に発生する電圧と、この時点
から一定時間遅れた時に前記巻線に発生する電圧によっ
て、モータの巻線異常およびスイッチング素子異常を判
断する請求項１記載のモータの異常検出回路。5. A motor according to a voltage generated in the winding when one winding is switched from an energized state to a non-energized state and a voltage generated in the winding when a certain time lags from this point. The motor abnormality detection circuit according to claim 1, which determines a winding abnormality and a switching element abnormality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4109449A JPH05308794A (en) | 1992-04-28 | 1992-04-28 | Motor anomaly detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4109449A JPH05308794A (en) | 1992-04-28 | 1992-04-28 | Motor anomaly detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05308794A true JPH05308794A (en) | 1993-11-19 |
Family
ID=14510524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4109449A Pending JPH05308794A (en) | 1992-04-28 | 1992-04-28 | Motor anomaly detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05308794A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6956349B2 (en) | 2003-05-23 | 2005-10-18 | Denso Corporation | Motor drive apparatus |
| US7121240B2 (en) | 2003-10-09 | 2006-10-17 | Denso Corporation | Valve controller |
| US7146944B2 (en) | 2003-10-15 | 2006-12-12 | Denso Corporation | Valve timing controller |
-
1992
- 1992-04-28 JP JP4109449A patent/JPH05308794A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6956349B2 (en) | 2003-05-23 | 2005-10-18 | Denso Corporation | Motor drive apparatus |
| US7121240B2 (en) | 2003-10-09 | 2006-10-17 | Denso Corporation | Valve controller |
| US7146944B2 (en) | 2003-10-15 | 2006-12-12 | Denso Corporation | Valve timing controller |
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