JP5116490B2 - モータ制御装置とそれを用いた電動工具 - Google Patents
モータ制御装置とそれを用いた電動工具 Download PDFInfo
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- JP5116490B2 JP5116490B2 JP2008000977A JP2008000977A JP5116490B2 JP 5116490 B2 JP5116490 B2 JP 5116490B2 JP 2008000977 A JP2008000977 A JP 2008000977A JP 2008000977 A JP2008000977 A JP 2008000977A JP 5116490 B2 JP5116490 B2 JP 5116490B2
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- side switching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
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- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/12—Monitoring commutation; Providing indication of commutation failure
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- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
-
- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/28—Arrangements for controlling current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Portable Power Tools In General (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
上記の問題を鑑み、本発明は、モータがロックした場合でもスイッチング素子の焼損が防止されるモータ制御装置を提供する。
そして、このモータ制御装置では、前記処理回路が、指示されたモータの目標回転速度に基づいてデューティ比を設定する設定処理、設定したデューティ比に基づいて前記オン信号をパルス幅変調するPWM処理、前記位置検出センサによる検出位置が更新される更新時間を計時する計時処理、前記設定処理によるデューティ比の設定値が80パーセント以上であって前記計時処理による計時時間が第1所定時間を超えたときにそのデューティ比の設定値を低下させる設定値低下処理、を実行することができる。第1所定時間は、前記モータが停止していると推定される時間に設定されている。
それにより、モータの出力を無用に低下させ過ぎることなく、ブートストラップコンデンサの放電による電圧低下を防止することができる。
このモータ制御装置によると、機械的ロックや過負荷等が除去されてモータが再び回転し始めた場合に、モータの回転速度を目標回転速度へ速やかに復帰させることができる。
それにより、機械的ロックや過負荷等によって回転不能な状態のモータへ電力を無用に供給し続けることを避けることができる。
(形態1) モータは、DC三相ブラシレスモータである。
(形態2) スイッチング素子には、nチャネルタイプの絶縁ゲート型電界効果トランジスタ(MOSFET)又は絶縁ゲート型バイポーラトランジスタ(IGBT)を用いることができる。
(形態3) モータ制御装置には、目標回転速度を設定する手段が設けられている。
図1は、電動ドライバ10の構成を示す側方断面図である。図1に示すように、電動ドライバ10は、本体12と、本体12に着脱可能に取付けられている電池パック50を備えている。本体12は、概して、略円柱形状の胴体部14と、胴体部14の側方に伸びるグリップ部16を備えている。電池パック50は、グリップ部16の先端に取付けられている。
制御装置100は、モータ32と電池パック50を電気的に接続するモータ駆動回路110を備えている。モータ駆動回路110は、モータ32のU相端子32uと電池パック50の正極50aを導通/遮断する第1スイッチング素子111と、モータ32のV相端子32vと電池パック50の正極50aを導通/遮断する第2スイッチング素子112と、モータ32のW相端子32wと電池パック50の正極50aを導通/遮断する第3スイッチング素子113と、モータ32のU相端子32uと電池パック50の負極50bを導通/遮断する第4スイッチング素子114と、モータ32のV相端子32vと電池パック50の負極50bを導通/遮断する第5スイッチング素子115と、モータ32のW相端子32wと電池パック50の負極50bを導通/遮断する第6スイッチング素子116を備えている。これらのスイッチング素子111−116は、nチャネルタイプの絶縁ゲート型電界効果トランジスタ(MOSFET)である。なお、スイッチング素子111−116には、例えば絶縁ゲート型バイポーラトランジスタ(IGBT)等の他のゲート駆動型の半導体スイッチング素子を用いることもできる。
本明細書では、モータ32の各端子32u、32v、32wと電池パック50の正極を導通/遮断する第1スイッチング素子111、第2スイッチング素子112、及び第3スイッチング素子113を、上アーム側スイッチング素子111−113と総称し、モータ32の各端子32u、32v、32wと電池パック50の負極を導通/遮断する第4スイッチング素子114、第5スイッチング素子115、第6スイッチング素子116を、下アーム側スイッチング素子114−116と総称することがある。
オン信号生成部152は、位置検出センサ34からのホール信号HSに基づいて、スイッチング素子111−116へ出力するオン信号UH、VH、WH、UL、VL、WLを生成する。図4に、位置検出センサ34がホール信号HSを更新するタイミングと、オン信号生成部152が生成するオン信号UH、VH、WH、UL、VL、WLの関係を例示する。また、図5に示すように、オン信号生成部152は、デューティ比設定部154によって設定されたデューティ比に基づいて、上アーム側スイッチング素子111−113へ出力するオン信号UH、VH、WHをパルス幅変調することができる。それにより、モータ32の回転速度が調節される。
図6は、デューティ比設定部154がデューティ比を設定する処理の流れを示すフローチャートである。デューティ比設定部154は、利用者によってトリガスイッチ28が操作されている間、図6に示す処理フローを実行する。
次に、ステップS20において、デューティ比設定部154は、入力したトリガ信号TGに基づいてデューティ比を設定する。
次に、ステップS30において、デューティ比設定部154は、設定したデューティ比が80パーセント以上であればステップS40の処理に進み、設定したデューティ比が80パーセント以上でなければステップS10の処理に戻る。即ち、設定したデューティ比が80パーセント以上でなければ、トリガスイッチ28から入力されるトリガ信号TGに応じて、デューティ比の設定を繰り返し実行する。
一方、ステップS40の処理に進んだ場合、デューティ比設定部154は、タイマ156による計時時間を確認する。そして、タイマ156による計時時間が第1所定時間T1以上であればステップS50の処理に進み、第1所定時間T1を超えていなければステップS10の処理に戻る。ここで、第1所定時間T1は、モータ32が停止していると推定される時間に設定され、例えば数十ミリ秒程度に設定することができる。即ち、このステップS40において、デューティ比設定部154は、モータ32が停止しているのか否かを判断する。そして、モータ32が停止していると判断した場合、ステップS50の処理に進む。
ここで、ステップS50の処理でデューティ比を低下させる幅は、10パーセントに限定されない。モータの出力を無用に低下させ過ぎることなく、ブートストラップコンデンサの放電による電圧低下を防止することができる範囲であればよく、具体的には10パーセントから50パーセントの範囲で設定するとよい。
また、電動ドライバ10のような電動工具では、モータの出力が低下したことが、利用者によって直ちに感受される。そのことから、ステップS50の処理でデューティ比を低下させることによって、モータ32への負荷が過大であることを利用者に報知することが可能となる。ただし、デューティ比を大きく低下させすぎると、電動ドライバ10からの反力が急激に低下することから、利用者がバランスを崩すといったことも起こりえる。これらの観点からも、デューティ比を低下させる幅は、10パーセントから50パーセントの範囲とすることが好ましい。
タイマ156による計時時間が第2所定時間T2以上となった場合(ステップS70の処理でイエス)、モータ32は依然として停止していると判断される。この場合、デューティ比設定部154はステップS80の処理に進み、デューティ比をゼロパーセントに設定する。それにより、図7に示すように、時点P1から第2所定時間T2が経過した時点P3において、モータ32の運転を強制的に終了する。
本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時の請求項に記載の組合せに限定されるものではない。本明細書または図面に例示した技術は複数の目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。
28:トリガスイッチ
32:モータ
34:位置検出センサ
50:電池パック
100:制御装置
111−116:スイッチング素子
121−126:ゲート駆動回路
131−133:ブートストラップ回路
131a−133a:ブートストラップコンデンサ
131b−133b:ダイオード
150:マイクロコンピュータ
152:オン信号生成部
154:デューティ比設定部
156:タイマ
Claims (5)
- ねじ類の締付作業に用いられる電動工具用のモータ制御装置であって、
モータの回転位置を検出する位置検出センサと、
モータの各端子を直流電源の正極に導通/遮断するゲート駆動型の上アーム側スイッチング素子と、
モータの各端子を直流電源の負極に導通/遮断するゲート駆動型の下アーム側スイッチング素子と、
前記位置検出センサによって検出されたモータの回転位置に基づいて、前記上アーム側スイッチング素子及び前記下アーム側スイッチング素子にオン信号を選択的に出力する処理回路と、
前記処理回路が出力する上アーム側スイッチング素子へのオン信号をレベルシフトし、前記上アーム側スイッチング素子のゲートへ駆動電圧を印加する上アーム側ゲート駆動回路と、
前記処理回路が出力する下アーム側スイッチング素子へのオン信号をレベルシフトし、前記下アーム側スイッチング素子のゲートへ駆動電圧を印加する下アーム側ゲート駆動回路と、
前記上アーム側スイッチング素子がオフのときに充電され、前記上アーム側スイッチング素子がオンのときに前記上アーム側ゲート駆動回路の電圧源として機能するブートストラップコンデンサを備え、
前記処理回路は、指示されたモータの目標回転速度に基づいてデューティ比を設定する設定処理、そのデューティ比の設定値に基づいて前記オン信号をパルス幅変調するPWM処理、前記位置検出センサによる検出位置が更新される時間間隔を計時する計時処理、前記設定処理によるデューティ比の設定値が80パーセント以上であって前記計時処理による計時間隔が第1所定時間を超えたときにそのデューティ比の設定値を低下させる設定値低下処理、を実行可能であり、
前記第1所定時間は、前記モータが停止していると推定される時間に設定されていることを特徴とするモータ制御装置。 - 前記処理回路は、前記設定値低下処理において、デューティ比の設定値を10パーセントから50パーセントの幅で低下させることを特徴とする請求項1に記載のモータ制御装置。
- 前記処理回路は、前記設定値低下処理の実行後、前記計時処理による計時時間が第1所定時間未満となったときに前記設定処理を再実行することを特徴とする請求項1又は2に記載のモータ制御装置。
- 前記処理回路は、前記設定値低下処理の実行後、前記計時処理による計時時間が第2所定時間を超えたときにモータの回転を停止させる処理、をさらに実行可能であることを特徴とする請求項1から3のいずれか一項に記載のモータ制御装置。
- ねじ類の締付作業に用いられる電動工具であって、
工具を回転させるモータと、
そのモータを制御する請求項1から4のいずれか一項に記載のモータ制御装置と、
を備える電動工具。
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008000977A JP5116490B2 (ja) | 2008-01-08 | 2008-01-08 | モータ制御装置とそれを用いた電動工具 |
| CN2008801234023A CN101911468B (zh) | 2008-01-08 | 2008-12-01 | 电动机控制装置及使用该电动机控制装置的电动工具 |
| US12/734,645 US8294399B2 (en) | 2008-01-08 | 2008-12-01 | Motor controller and electric tool having the same |
| EP08870429A EP2219288A4 (en) | 2008-01-08 | 2008-12-01 | MOTOR CONTROL AND ELECTRIC TOOL WITH CONTROL |
| PCT/JP2008/071779 WO2009087834A1 (ja) | 2008-01-08 | 2008-12-01 | モータ制御装置とそれを用いた電動工具 |
| RU2010133155/07A RU2478256C2 (ru) | 2008-01-08 | 2008-12-01 | Контроллер двигателя и электроинструмент, имеющий вышеупомянутый контроллер |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008000977A JP5116490B2 (ja) | 2008-01-08 | 2008-01-08 | モータ制御装置とそれを用いた電動工具 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009165280A JP2009165280A (ja) | 2009-07-23 |
| JP5116490B2 true JP5116490B2 (ja) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008000977A Expired - Fee Related JP5116490B2 (ja) | 2008-01-08 | 2008-01-08 | モータ制御装置とそれを用いた電動工具 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8294399B2 (ja) |
| EP (1) | EP2219288A4 (ja) |
| JP (1) | JP5116490B2 (ja) |
| CN (1) | CN101911468B (ja) |
| RU (1) | RU2478256C2 (ja) |
| WO (1) | WO2009087834A1 (ja) |
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- 2008-12-01 WO PCT/JP2008/071779 patent/WO2009087834A1/ja not_active Ceased
- 2008-12-01 US US12/734,645 patent/US8294399B2/en not_active Expired - Fee Related
- 2008-12-01 CN CN2008801234023A patent/CN101911468B/zh not_active Expired - Fee Related
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- 2008-12-01 EP EP08870429A patent/EP2219288A4/en not_active Withdrawn
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| US8294399B2 (en) | 2012-10-23 |
| RU2010133155A (ru) | 2012-02-20 |
| US20100308764A1 (en) | 2010-12-09 |
| RU2478256C2 (ru) | 2013-03-27 |
| CN101911468B (zh) | 2013-03-27 |
| CN101911468A (zh) | 2010-12-08 |
| EP2219288A4 (en) | 2012-09-12 |
| EP2219288A1 (en) | 2010-08-18 |
| WO2009087834A1 (ja) | 2009-07-16 |
| JP2009165280A (ja) | 2009-07-23 |
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