JP2007195366A - Speed controller for portable electric power cutting tool - Google Patents

Speed controller for portable electric power cutting tool Download PDF

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Publication number
JP2007195366A
JP2007195366A JP2006012657A JP2006012657A JP2007195366A JP 2007195366 A JP2007195366 A JP 2007195366A JP 2006012657 A JP2006012657 A JP 2006012657A JP 2006012657 A JP2006012657 A JP 2006012657A JP 2007195366 A JP2007195366 A JP 2007195366A
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speed
motor
soft start
cutting tool
circular saw
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JP4939065B2 (en
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Taiji Okada
泰治 岡田
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Ryobi Ltd
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Ryobi Ltd
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Priority to JP2006012657A priority Critical patent/JP4939065B2/en
Priority to CN2006800501583A priority patent/CN101351955B/en
Priority to PCT/JP2006/323592 priority patent/WO2007083447A1/en
Publication of JP2007195366A publication Critical patent/JP2007195366A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details of starting control
    • H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
    • 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual dc motor
    • 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
    • H02P29/10—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for preventing overspeed or under speed
    • 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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
    • H02P7/295—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC of the kind having one thyristor or the like in series with the power supply and the motor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve the workability and operability of an electric power circular saw A suppressing reaction which is reverse to that at starting time which is generated when shifted to a constant-speed operating region from an accelerating operating region, without lengthening soft start time, in the electric power circular saw A with a soft start function which causes a rotating speed of a motor 9 to reach a set speed in the constant-speed operating region after a lapse of the predetermined soft start time from starting. <P>SOLUTION: A response of rotating speed feedback control to a motor 9 is made slow, then overshoot control is forcedly performed wherein the rotating speed of the motor 9 slows down up to the set speed after once the rotating speed exceeds the optimal set speed for cutting, at a point when shifted to the constant-speed operating region from the accelerating operating region after starting of the motor 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、携帯用電動切断工具の速度制御装置に関し、特に、ソフトスタート機能を設けたものに関する。   The present invention relates to a speed control device for a portable electric cutting tool, and particularly to a device provided with a soft start function.

従来より、電動丸鋸等の携帯用電動切断工具は、その電動機の起動時の反動が大きいことから、電動機の速度制御においてソフトスタート機能（例えば０．７秒〜２秒）を設けた制御を行うことによって電動機の反動を抑える方法は一般的に知られている。このソフトスタート機能は、起動時の反動（電動機の回転方向とは反対向きの反動）を抑えるとともに、加速運転領域（ソフトスタート領域）から定速運転領域へ移る段階で急激に加速度がなくなることに起因して発生する、起動時とは逆の反動を抑える働きも有している。   Conventionally, a portable electric cutting tool such as an electric circular saw has a large recoil at the time of starting the electric motor. Therefore, a control with a soft start function (for example, 0.7 second to 2 seconds) is provided in the speed control of the electric motor. A method for suppressing the reaction of the electric motor by performing the method is generally known. This soft start function suppresses reaction at the time of start-up (reaction opposite to the rotation direction of the motor), and at the stage of moving from the acceleration operation area (soft start area) to the constant speed operation area, the acceleration is suddenly lost. It also has the function of suppressing the reaction that occurs due to the reverse reaction at the time of startup.

一方、ソフトスタートが終了して定速運転領域に移行する際に過渡的に回転速度が設定速度を超えて大きな回転速度となるオーバーシュートは、加速運転領域から定速運転領域に移る間の移行領域に要する時間を長くし、操作性を悪くしているだけでなく、電動工具に共振状態を生じる恐れがあることから、従来、このオーバーシュートを最小限にすることが提案されている（特許文献１参照）。   On the other hand, when the soft start is finished and the transition to the constant speed operation area is over, the overshoot that causes the rotational speed to transiently exceed the set speed and become a large rotation speed is a transition during the transition from the acceleration operation area to the constant speed operation area. In addition to lengthening the time required for the region and deteriorating operability, it has been proposed to minimize this overshoot because there is a risk of causing a resonance state in the power tool (patented) Reference 1).

ところで、上記ソフトスタートについては、例えば図４に示すように、オーバーシュートがないとした場合に、定速運転領域では電動機の回転速度を設定速度ｖ１で制御する速度制御において、ソフトスタート時間ｔ１によって加速運転領域をＡの傾きで起動させるのに比べ、そのソフトスタート時間ｔ１よりも長いソフトスタート時間ｔ２（＞ｔ１）によって加速運転領域をＢの傾きで起動させた方が、起動時に受ける反動は小さくなる。   By the way, with respect to the soft start, for example, as shown in FIG. 4, when there is no overshoot, in the speed control in which the rotation speed of the motor is controlled at the set speed v1 in the constant speed operation region, the soft start time t1 Compared to starting the acceleration operation region with a slope of A, the reaction that the acceleration operation region is started with a slope of B with a soft start time t2 (> t1) longer than the soft start time t1 Get smaller.

また、加速運転領域から定速運転領域に移るポイントＣ，Ｄでは、ソフトスタートの終了に伴い加速度が急激に０となるため、起動時とは逆の反動を受けることになるが、定速運転領域に達する迄のソフトスタート時間をより長くすれば、この逆の反動は少なくなる。すなわち、傾きＢのように定速運転領域に達する迄のソフトスタート時間ｔ２の長いポイントＤの方が、傾きＡのようにソフトスタート時間ｔ１の短いポイントＣに比べ、逆の反動を受け難くなる。
特公平３−６７４４号公報 In addition, at points C and D that move from the acceleration operation region to the constant speed operation region, the acceleration suddenly becomes zero with the end of the soft start. The longer the soft start time to reach the region, the less this reverse reaction. That is, the point D having a long soft start time t2 until reaching the constant speed operation region as shown by the slope B is less susceptible to the reverse reaction than the point C having a short soft start time t1 as shown by the slope A. .
Japanese Patent Publication No. 3-6744

しかしながら、このように定速運転領域に達する迄のソフトスタート時間をより長くすることにより起動時の反動と起動時とは逆の反動とを抑制できる反面、頻繁に電源をＯＮ／ＯＦＦして使用する電動切断工具（例えば電動丸鋸等）の場合、定速運転領域に到達するまでのソフトスタート時間が長くなると、その分、切断開始に最適な速度（設定速度）である定速運転領域に至るまでの時間、すなわち起動開始から最適な速度で作業できるまでの待ち時間が長くなり、作業性が非常に悪くなるという問題がある。   However, by increasing the soft start time until reaching the constant speed operation range in this way, it is possible to suppress the reaction at the start and the reaction opposite to the start, but frequently use the power supply ON / OFF. In the case of an electric cutting tool (such as an electric circular saw), the longer the soft start time to reach the constant speed operation area, the more the speed (set speed) that is optimal for starting cutting will be There is a problem that the waiting time until the work can be completed at the optimum speed from the start of startup becomes long, and the workability becomes very bad.

また、特許文献１のようにオーバーシュートの発生をなくしたり小さくしたりすると、前述の逆反動は、オーバーシュートにより打ち消されたり減少させられたりすることなく発生する。   Further, when the occurrence of overshoot is eliminated or reduced as in Patent Document 1, the aforementioned reverse reaction occurs without being canceled or reduced by the overshoot.

特に、電動丸鋸のように大きな径をした重量のある刃物を有する電動切断工具では、加速運転領域から定速運転領域に移る点Ｃで、刃物の慣性により大きな加速度が付いている刃物の加速度が急激に０となることにより発生する起動時の反動（ハンドルを持った手を支点にして丸鋸の前側を下げようとするカ）とは逆向きの反動（ハンドルを持った手を支点にして丸鋸の前側を持ち上げようとするカ）が、発生しないか又は小さくされたオーバーシュートにより抑えられる（打ち消される）ことなくそのまま発生することとなるため、却って操作性が悪くなるのは避けられない。   In particular, in an electric cutting tool having a heavy blade with a large diameter, such as an electric circular saw, the acceleration of the blade having a large acceleration due to the inertia of the blade at a point C that moves from the acceleration operation region to the constant speed operation region. The reaction at the time of start-up that occurs when the value suddenly becomes zero (the action that attempts to lower the front side of the circular saw with the hand holding the handle as the fulcrum) (the reaction with the hand holding the handle as the fulcrum) Therefore, the operability of the circular saw is lifted without being generated or suppressed (cancelled) by the reduced overshoot. Absent.

本発明は斯かる諸点に鑑みてなされたものであり、その目的は、携帯用電動切断工具における電動機の速度制御に工夫を加えることにより、そのソフトスタート時間を長くすることなく、加速運転領域から定速運転領域に移行する時に発生する起動時とは逆の反動を抑え、携帯用電動切断工具の作業性及び操作性の向上を図ることにある。   The present invention has been made in view of the above points, and its purpose is to improve the speed control of the electric motor in the portable electric cutting tool without increasing the soft start time and from the acceleration operation region. The object is to suppress the reaction opposite to the start-up that occurs when shifting to the constant speed operation region, and to improve the workability and operability of the portable electric cutting tool.

上記の目的の達成のため、この発明では、加速運転領域から定速運転領域に移る際の起動時とは逆の反動を抑えるために、敢えてオーバーシュートを強制的に発生させるようにした。   In order to achieve the above object, in the present invention, an overshoot is forcibly generated in order to suppress a reaction opposite to that at the time of startup when moving from the acceleration operation region to the constant speed operation region.

具体的には、第１の発明では、電動機の回転速度を起動から所定のソフトスタート時間を経た後に定速運転領域の設定速度に到達させるソフトスタート機能を備えた携帯用電動切断工具の速度制御装置において、上記ソフトスタート機能の終了時、電動機の回転速度が上記定速運転領域の設定速度を一旦超えた後に該設定速度に低下するように電動機の回転速度のオーバーシュート制御を強制的に行う速度制御手段を設けたことを特徴とする。   Specifically, in the first invention, the speed control of the portable electric cutting tool having a soft start function for causing the rotation speed of the electric motor to reach the set speed in the constant speed operation region after a predetermined soft start time from the start. In the apparatus, at the end of the soft start function, overshoot control of the rotational speed of the motor is forcibly performed so that the rotational speed of the motor once exceeds the set speed in the constant speed operation region and then decreases to the set speed. A speed control means is provided.

上記の構成によると、電動機の起動時、ソフトスタート機能により起動から所定のソフトスタート時間を経た後に定速運転領域の設定速度に到達するとともに、この加速運転領域（ソフトスタート領域）から定速運転領域に移るポイントでは、速度制御手段によりオーバーシュート制御が強制的に行われ、電動機の回転速度が切断工具の切削に最適な速度である設定速度を敢えて超えた後、設定速度まで落ちる制御が行われるので、ソフトスタート領域が終了して加速度がなくなった時の逆反動を、ソフトスタート時間を長くせずとも少なくすることができ、操作性が向上する。   According to the above configuration, when the motor is started, the set speed of the constant speed operation area is reached after a predetermined soft start time from the start by the soft start function, and constant speed operation is performed from this acceleration operation area (soft start area). At the point that moves to the area, overshoot control is forcibly performed by the speed control means, and after the motor speed has deliberately exceeded the set speed, which is the optimum speed for cutting the cutting tool, control is performed to drop to the set speed. Therefore, the reverse reaction when the soft start region ends and the acceleration disappears can be reduced without increasing the soft start time, and the operability is improved.

また、ソフトスタート時間を長くする必要がないので、設定速度まで素早く立ち上げることができることになり、作業性が大幅に向上する。   Further, since it is not necessary to lengthen the soft start time, it is possible to quickly start up to the set speed, and the workability is greatly improved.

第２の発明では、上記速度制御手段は、電動機に対する回転速度フィードバック制御（位相制御電圧）の応答性を鈍くすることで、オーバーシュート制御を行うものとする。このことで、オーバーシュートの発生を容易に行うことができる。   In the second invention, the speed control means performs overshoot control by reducing the responsiveness of the rotational speed feedback control (phase control voltage) to the electric motor. Thus, overshoot can be easily generated.

第３の発明では、上記携帯用電動切断工具は電動丸鋸とする。このことで、上記効果を有効に奏することのできる携帯用電動切断工具が得られる。   In the third invention, the portable electric cutting tool is an electric circular saw. Thereby, the portable electric cutting tool which can show | play the said effect effectively is obtained.

以上説明のように、第１及び第３の発明によると、電動機の起動後の加速運転領域から定速運転領域に移るポイントで、電動機の回転速度が切削に最適な設定速度を一旦超えた後に設定速度まで落ちるオーバーシュート制御を強制的に行うようにしたことにより、ソフトスタート時間を長くすることなく、ソフトスタート領域が終了して加速度がなくなった時の逆反動を少なくすることができ、携帯用電動切断工具の操作性及び作業性双方の向上を図ることができる。   As described above, according to the first and third aspects of the invention, after the motor rotation speed has shifted from the acceleration operation area to the constant speed operation area after the motor starts, the rotation speed of the motor once exceeds the optimum setting speed for cutting. By overloading control forcibly down to the set speed, it is possible to reduce the reverse reaction when the soft start region ends and acceleration disappears without increasing the soft start time. Both the operability and workability of the electric power cutting tool can be improved.

第２の発明によれば、電動機に対する位相制御電圧の応答性を鈍くしてオーバーシュート制御を行うようにしたことにより、オーバーシュートの発生を容易に行うことができる。   According to the second invention, overshoot control can be easily performed by reducing the response of the phase control voltage to the electric motor and performing the overshoot control.

以下、本発明の最良の実施形態を図面に基づいて詳細に説明する。以下の好ましい実施形態の説明は、本質的に例示に過ぎず、本発明、その適用物或いはその用途を制限することを意図するものでは全くない。   Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

図２は本発明の実施形態に係る携帯用電動切断工具としての電動丸鋸Ａの構成を概略的に示す。この電動丸鋸Ａはハウジング１を備え、このハウジング１は、水平左右方向（図２の紙面と直交する方向）に延びかつ右端（図２では手前側）が開口された有底筒状のモータケース２と、このモータケース２の右端部に一体的に取付固定された密閉状のギヤボックス３と、モータケース２の右端外周部に一体的に組み付けられ、下側に開放された丸鋸刃カバー４とを備えてなる。上記モータケース２の内部には、水平左右方向に延びる出力軸９ａを有するモータ９（電動機）が該出力軸９ａを上記ギヤボックス３内に突出させて収容固定され、この出力軸９ａの外周にギヤ部１０が形成されている。また、モータケース２の上部には電動丸鋸Ａを操作するためのハンドル５が一体的に固定されている。   FIG. 2 schematically shows the configuration of an electric circular saw A as a portable electric cutting tool according to an embodiment of the present invention. This electric circular saw A includes a housing 1, which has a bottomed cylindrical motor that extends in a horizontal left-right direction (a direction orthogonal to the paper surface of FIG. 2) and has an open right end (front side in FIG. 2). Case 2, a sealed gear box 3 that is integrally attached and fixed to the right end portion of the motor case 2, and a circular saw blade that is integrally assembled to the outer peripheral portion of the right end of the motor case 2 and opened to the lower side And a cover 4. Inside the motor case 2, a motor 9 (electric motor) having an output shaft 9a extending in the horizontal left-right direction is accommodated and fixed by projecting the output shaft 9a into the gear box 3, and on the outer periphery of the output shaft 9a. A gear portion 10 is formed. A handle 5 for operating the electric circular saw A is integrally fixed to the upper part of the motor case 2.

上記ギヤボックス３内には、水平左右方向に延びる中間軸１７及び鋸刃軸１８が回転可能に支持され、中間軸１７の左端部には上記モータ出力軸９ａのギヤ部１０に噛合しかつ該ギヤ部１０よりも大径の第１中間ギヤ１３が、また右端部には第１中間ギヤ１３よりも小径の第２中間ギヤ１４がそれぞれ回転一体に設けられている。一方、鋸刃軸１８の左端部には上記第２中間ギヤ１４に噛合しかつ該第２中間ギヤ１４と略同径の第３中間ギヤ１５が回転一体に設けられ、鋸刃軸１８の右端部はギヤボックス３の外側に突出し、この突出部（右端部）に、その先端面に螺合する取付ボルト２１によって丸鋸刃２０が回転一体に取り付けられ、この鋸刃軸１８への取付状態で丸鋸刃２０の略上半部が上記丸鋸刃カバー４により覆われるようになっている。   An intermediate shaft 17 and a saw blade shaft 18 extending horizontally in the horizontal direction are rotatably supported in the gear box 3, and the left end portion of the intermediate shaft 17 meshes with the gear portion 10 of the motor output shaft 9a. A first intermediate gear 13 having a larger diameter than that of the gear portion 10 and a second intermediate gear 14 having a smaller diameter than that of the first intermediate gear 13 are integrally provided at the right end portion. On the other hand, a third intermediate gear 15 that meshes with the second intermediate gear 14 and has substantially the same diameter as the second intermediate gear 14 is provided integrally with the left end portion of the saw blade shaft 18 so as to rotate. The part protrudes to the outside of the gear box 3, and the circular saw blade 20 is attached to the protrusion (right end) by a mounting bolt 21 that is screwed to the front end surface thereof, and is attached to the saw blade shaft 18. The substantially upper half of the circular saw blade 20 is covered with the circular saw blade cover 4.

そして、以上のモータ出力軸９ａのギヤ部１０及び第１〜第３中間ギヤ１３〜１５により、モータ９の出力軸９ａの回転を減速して丸鋸刃２０に伝達して、その丸鋸刃２０を図２で反時計回り方向に回転駆動する伝動ギヤ機構１２が構成されている。   The rotation of the output shaft 9a of the motor 9 is decelerated and transmitted to the circular saw blade 20 by the gear portion 10 of the motor output shaft 9a and the first to third intermediate gears 13-15, and the circular saw blade. A transmission gear mechanism 12 that rotates 20 in a counterclockwise direction in FIG. 2 is configured.

尚、上記ハウジング１の下側には定盤７が配設され、この定盤７は、前端部（図で右側端）がハウジング１の前端に締結部材６を介して回動可能に締結されており、その回動角度を調整することにより、丸鋸刃２０の定盤７下側への突出量（電動丸鋸Ａの切込み深さ）を加減するようになっている。   A surface plate 7 is disposed on the lower side of the housing 1, and the surface plate 7 is fastened with a front end portion (right end in the figure) to the front end of the housing 1 via a fastening member 6. The amount of protrusion of the circular saw blade 20 to the lower side of the surface plate 7 (the cutting depth of the electric circular saw A) is adjusted by adjusting the rotation angle.

また、８はギヤボックス３の右端部に回動可能に支持された安全カバーで、図外のワークを切断する際にはワークに押されて回動しながらハウジング１の丸鋸刃カバー４内に入り込むようになっている。また、２２は上記丸鋸刃カバー４の右壁部に開口された切粉排出口である。   Reference numeral 8 denotes a safety cover rotatably supported at the right end of the gear box 3. When cutting a workpiece (not shown), the safety cover 8 is pushed by the workpiece and is rotated while rotating inside the circular saw blade cover 4 of the housing 1. It comes to get in. Reference numeral 22 denotes a chip discharge port opened in the right wall portion of the circular saw blade cover 4.

図１は、以上の構成を持つ電動丸鋸Ａのモータ９の回転速度（回転数）を制御するための速度制御装置Ａ１の回路図を示す。この速度制御装置Ａ１は、電動丸鋸Ａのハンドル５に設けた操作スイッチ（図示せず）のＯＮ操作により商用電源１００ＶＡＣに接続されるもので、モータ９の回転速度を起動から所定のソフトスタート時間を経た後に定速運転領域の設定速度に到達させるソフトスタート機能を備えている。速度制御装置Ａ１は専用ＩＣ３０（Ｕ−２１１Ｂ）を有し、このＩＣ３０はソフトスタート機能及び回転数フィードバック機能を有する位相制御ＩＣからなっている。上記モータ９は例えば整流子モータからなり、図１ではモータ９をその界磁コイル及びアマチュアコイルによって示している。   FIG. 1 shows a circuit diagram of a speed control device A1 for controlling the rotational speed (number of rotations) of the motor 9 of the electric circular saw A having the above configuration. This speed control device A1 is connected to the commercial power supply 100VAC by turning on an operation switch (not shown) provided on the handle 5 of the electric circular saw A, and the rotational speed of the motor 9 is started from the start to a predetermined soft start. It has a soft start function to reach the set speed in the constant speed operation area after a lapse of time. The speed control device A1 has a dedicated IC 30 (U-211B), and this IC 30 includes a phase control IC having a soft start function and a rotation speed feedback function. The motor 9 is composed of, for example, a commutator motor. In FIG. 1, the motor 9 is indicated by its field coil and amateur coil.

上記ＩＣ３０は、１００ＶＡＣからコンデンサＣ１、抵抗Ｒ１及びダイオードＤ１により形成される電源電圧を制御する電源電圧制御部３１と、その電圧を監視する電圧監視部３２と、ＩＣ３０の７番ピンに接続されて、モータ９の回転数（回転速度）を検出する回転速度センサ４３の出力パルス信号（周波数）を電圧に変換するＦ／Ｖ変換器３３と、モータ９を起動時にソフトスタートさせるためのソフトスタート部３４と、Ｆ／Ｖ変換器３３の出力とＩＣ３０の６番ピンに接続された抵抗Ｒ１３及び可変抵抗器ＶＲにより設定される定速運転領域の設定回転数とを比較する制御アンプ３５と、この制御アンプ３５の出力に基づき位相制御を行う位相制御ブロック３６と、位相制御ブロック３６の出力により４番ピンに接続されているＴＲＩＡＣ４４のゲート端子にトリガパルスを出力するパルス出力部３７との他、電圧検出部３８、電流検出部３９、負荷制限部４０、基準電圧部４１等を有する。   The IC 30 is connected to a power supply voltage control unit 31 that controls a power supply voltage formed by a capacitor C1, a resistor R1, and a diode D1 from 100 VAC, a voltage monitoring unit 32 that monitors the voltage, and a seventh pin of the IC 30. , An F / V converter 33 that converts the output pulse signal (frequency) of the rotation speed sensor 43 that detects the rotation speed (rotation speed) of the motor 9 into a voltage, and a soft start unit that soft-starts the motor 9 at startup 34, a control amplifier 35 for comparing the output of the F / V converter 33 with the set speed of the constant speed operation region set by the resistor R13 and the variable resistor VR connected to the 6th pin of the IC 30; A phase control block 36 that performs phase control based on the output of the control amplifier 35, and a TR connected to the fourth pin by the output of the phase control block 36 Other pulse output section 37 for outputting a trigger pulse to the gate terminal of AC44, has a voltage detector 38, current detector 39, the load limiting section 40, the reference voltage unit 41 and the like.

上記ソフトスタート部３４は、モータ９の回転速度を電源投入による起動から所定のソフトスタート時間を経た後に定速運転領域の設定速度に到達させるもので、そのソフトスタート時間は、ＩＣ３０の１２番ピンに接続されたコンデンサＣ３の値により決定され、この実施形態では例えば約０．７秒に設定されている。   The soft start unit 34 causes the rotation speed of the motor 9 to reach the set speed in the constant speed operation region after a predetermined soft start time has elapsed since the start-up by turning on the power. The soft start time is the 12th pin of the IC 30. In this embodiment, for example, it is set to about 0.7 seconds.

また、ＩＣ３０の１１番ピンに接続されたコンデンサＣ７，Ｃ８及び抵抗Ｒ７を、モータ９に対する回転速度フィードバック制御（位相制御電圧）の応答性を鈍くするように設定することで、上記ソフトスタート機能の終了時、モータ９の回転速度が上記定速運転領域の設定速度（最適切削速度）を一旦超えた後に該設定速度に低下するオーバーシュート制御を強制的に行うようになっており、この実施形態では、上記コンデンサＣ７，Ｃ８及び抵抗Ｒ７により、オーバーシュート制御を行うための速度制御手段４６が構成されている。   Further, by setting the capacitors C7 and C8 and the resistor R7 connected to the 11th pin of the IC 30 so as to make the response of the rotational speed feedback control (phase control voltage) to the motor 9 dull, At the end, after the rotational speed of the motor 9 once exceeds the set speed (optimal cutting speed) in the constant speed operation region, overshoot control is forcibly performed to decrease to the set speed. Then, the capacitors C7, C8 and the resistor R7 constitute a speed control means 46 for performing overshoot control.

したがって、上記実施形態においては、電動丸鋸Ａの操作スイッチのＯＮ操作により、速度制御装置Ａ１に１００ＶＡＣが入力されると、コンデンサＣ１、抵抗Ｒ１及びダイオードＤ１によりＩＣ３０に電源が供給される。ＩＣ３０のパルス出力部３７から４番ピンによりＴＲＩＡＣ４４のゲート端子にトリガパルスが出力され、モータ９が起動されて回転し始める。   Therefore, in the above embodiment, when 100 VAC is input to the speed control device A1 by turning on the operation switch of the electric circular saw A, power is supplied to the IC 30 by the capacitor C1, the resistor R1, and the diode D1. A trigger pulse is output from the pulse output unit 37 of the IC 30 to the gate terminal of the TRIAC 44 by the 4th pin, and the motor 9 is started to start rotating.

また、回転数センサ４３によってモータ９の回転数が検出され、その回転数情報はＩＣ３０の７番ピンによってＦ／Ｖ変換器３３に入力されてパルス数に応じた電圧に変換される。   The rotation speed of the motor 9 is detected by the rotation speed sensor 43, and the rotation speed information is input to the F / V converter 33 by the 7th pin of the IC 30 and converted into a voltage corresponding to the number of pulses.

そして、抵抗Ｒ１３及び可変抵抗器ＶＲにより設定された設定回転数に対応する電圧がＩＣ３０の１０番ピンを経て制御アンプ３５の＋極へ入力され、この制御アンプ３５において、−極に入力されて電圧に変換された上記モータ回転数の電圧と比較され、制御アンプ３５の出力により位相制御ブロック３６及びパルス出力部３７を介してＴＲＩＡＣ４４の導通角が変えられ、センサ４３により検出されたモータ９の回転数が設定回転数になるようにフィードバック制御が行われる。   A voltage corresponding to the set rotational speed set by the resistor R13 and the variable resistor VR is input to the positive pole of the control amplifier 35 through the 10th pin of the IC 30, and is input to the negative pole in the control amplifier 35. The conduction angle of the TRIAC 44 is changed by the output of the control amplifier 35 via the phase control block 36 and the pulse output unit 37 by comparing with the voltage of the motor rotation speed converted into the voltage, and the motor 9 detected by the sensor 43. Feedback control is performed so that the rotational speed becomes the set rotational speed.

ここで、仮に、ＩＣ３０の１１番ピンに接続されたコンデンサＣ７，Ｃ８及び抵抗Ｒ７の値により決定される回転速度フィードバック制御（位相制御電圧）の応答性を高く（良く）するか、又は突入電流をなくしたり小さくしたりすれば、図３で破線にて示すように、加速運転領域から定速運転領域（設定速度領域）への移行時において、起動時の過渡的に回転数が増加する現象であるオーバーシュートを減少させることができる。しかし、そのオーバーシュートを小さくすると、加速運転領域から定速運転領域へ移行する時点のポイントＣにおいて、加速度が急激に０或いは小さくなり、起動時とは逆の反動（図２の矢印ａに示すように、ハンドル５を持った手を支点にして丸鋸Ａの前側を持ち上げようとする力）を生じることとなる。   Here, suppose that the responsiveness of the rotational speed feedback control (phase control voltage) determined by the values of the capacitors C7 and C8 and the resistor R7 connected to the 11th pin of the IC 30 is increased (or improved), or the inrush current. If the value is eliminated or reduced, as indicated by the broken line in FIG. 3, a transient increase in the number of revolutions at start-up occurs during the transition from the acceleration operation region to the constant speed operation region (set speed region). The overshoot that is can be reduced. However, if the overshoot is reduced, the acceleration suddenly becomes zero or smaller at the point C at the time of transition from the acceleration operation region to the constant speed operation region, and the reaction (as indicated by the arrow a in FIG. 2) opposite to that at the start. Thus, a force to lift the front side of the circular saw A with the hand holding the handle 5 as a fulcrum is generated.

しかし、この実施形態に係る電動丸鋸Ａでは、上記コンデンサＣ７，Ｃ８及び抵抗Ｒ７の値が、上記回転速度フィードバック制御（位相制御電圧）の応答性を低く（鈍く）するように設定されているので、図３で実線にて示すように、加速運転領域から定速運転領域（設定速度領域）への移行時にモータ９の回転数が強制的に増加（増速）されてオーバーシュートが生じ、切断作業に最適とされる速度である設定速度ｖ１を一旦超え、その後に設定速度ｖ１へ滑らかに移行する。このように、ソフトスタート終了時のモータ９の回転数（速度）を一旦、設定速度よりもオーバシュートさせた後に、設定速度まで滑らかに移行するようにしたため、上記の如き起動時とは逆の反動を抑制でき、電動丸鋸Ａの操作性を向上させることができることとなる。例えば図３の破線はＣ７を３．３μＦ、Ｃ８を０．２２μＦ、抵抗Ｒ７を２２ＫΩとしたものであるのに対し、実線はＣ７を３．３μＦ、Ｃ８を０．２２μＦ、抵抗Ｒ７を３３ＫΩとしたものである。   However, in the electric circular saw A according to this embodiment, the values of the capacitors C7 and C8 and the resistor R7 are set so as to lower (dull) the responsiveness of the rotational speed feedback control (phase control voltage). Therefore, as shown by a solid line in FIG. 3, the rotational speed of the motor 9 is forcibly increased (accelerated) at the time of transition from the acceleration operation region to the constant speed operation region (set speed region), and overshoot occurs. The set speed v1 that is the optimum speed for the cutting operation is temporarily exceeded, and then the speed is smoothly shifted to the set speed v1. As described above, since the rotational speed (speed) of the motor 9 at the end of the soft start is once overshooted from the set speed and then smoothly shifted to the set speed, the reverse of the start-up as described above. The reaction can be suppressed and the operability of the electric circular saw A can be improved. For example, the broken line in FIG. 3 shows C7 as 3.3 μF, C8 as 0.22 μF, and resistor R7 as 22 KΩ, while the solid line shows C7 as 3.3 μF, C8 as 0.22 μF, and resistor R7 as 33 KΩ. It is a thing.

すなわち、ソフトスタート時間を長く取ることなく、起動時とは逆の反動を抑制することができるようになるので、電動丸鋸Ａを使用する作業者にとって、起動時、回転速度が設定速度に達するまでのソフトスタートによる待ち時間を必要以上に長くする必要がなくなり、よって、電動丸鋸Ａの作業性を損なうことなく、その操作性を向上させることができる。   That is, since it becomes possible to suppress the reaction opposite to that at the time of starting without taking a long soft start time, the rotation speed reaches the set speed at the time of starting for the operator who uses the electric circular saw A. Thus, it is not necessary to make the waiting time due to the soft start longer than necessary, so that the operability of the electric circular saw A can be improved without impairing the workability.

（その他の実施形態）
尚、上記実施形態では、モータ９に対する回転速度フィードバック制御（位相制御電圧）の応答性を鈍くすることで、オーバーシュート制御を行うようにしているが、本発明は上記方法に限定されず、他の方法によりオーバーシュート制御を行うようにしてもよい。 (Other embodiments)
In the above embodiment, the overshoot control is performed by slowing down the response of the rotational speed feedback control (phase control voltage) to the motor 9, but the present invention is not limited to the above method. Overshoot control may be performed by this method.

また、上記実施形態は、電動丸鋸Ａに適用した例であるが、本発明は電動丸鋸Ａ以外の携帯用電動切断工具にも適用できるのは勿論であり、同様の作用効果を奏することができる。   Moreover, although the said embodiment is an example applied to the electric circular saw A, of course, this invention is applicable also to portable electric cutting tools other than the electric circular saw A, and there exists the same effect. Can do.

本発明は、携帯用電動切断工具のソフトスタートによる待ち時間を必要以上に長くすることなく、起動時とは逆の反動を抑制して、その作業性と操作性との両立を図ることができるので、極めて有用で産業上の利用可能性が高い。   The present invention makes it possible to achieve both workability and operability by suppressing a reaction opposite to that at the time of activation without unnecessarily increasing the waiting time due to soft start of the portable electric cutting tool. Therefore, it is extremely useful and has high industrial applicability.

図１は、本発明の実施形態に係る電動丸鋸用速度制御装置の回路図である。FIG. 1 is a circuit diagram of a speed control device for an electric circular saw according to an embodiment of the present invention. 図２は、電動丸鋸の構成を示す右側面図である。FIG. 2 is a right side view showing the configuration of the electric circular saw. 図３は、オーバーシュート制御によってモータ回転速度が変化した特性を示す特性図である。FIG. 3 is a characteristic diagram showing characteristics in which the motor rotation speed is changed by overshoot control. 図４は、ソフトスタート機能を説明するための特性図である。FIG. 4 is a characteristic diagram for explaining the soft start function.

符号の説明Explanation of symbols

Ａ 電動丸鋸（携帯用電動切断工具）
Ａ１ 速度制御装置
１ ハウジング
９ モータ（電動機）
１２ 伝動ギヤ機構
２０ 丸鋸刃
３０ ＩＣ
４３ 回転数センサ
４６ 速度制御手段 A Electric circular saw (portable electric cutting tool)
A1 Speed control device 1 Housing 9 Motor (electric motor)
12 Transmission gear mechanism 20 Circular saw blade 30 IC
43 Speed sensor 46 Speed control means

Claims (3)

電動機の回転速度を起動から所定のソフトスタート時間を経た後に定速運転領域の設定速度に到達させるソフトスタート機能を備えた携帯用電動切断工具の速度制御装置において、
上記ソフトスタート機能の終了時、電動機の回転速度が上記定速運転領域の設定速度を一旦超えた後に該設定速度に低下するように電動機の回転速度のオーバーシュート制御を強制的に行う速度制御手段を設けたことを特徴とする携帯用電動切断工具の速度制御装置。 In the speed control device for a portable electric cutting tool having a soft start function for reaching the set speed in the constant speed operation region after passing a predetermined soft start time from the start of the rotation speed of the electric motor,
Speed control means for forcibly performing overshoot control of the rotation speed of the motor so that the rotation speed of the motor once decreases beyond the set speed in the constant speed operation region at the end of the soft start function. A speed control device for a portable electric cutting tool characterized by comprising: 請求項１の携帯用電動切断工具の速度制御装置において、
速度制御手段は、電動機に対する回転速度フィードバック制御の応答性を鈍くすることで、オーバーシュート制御を行うものであることを特徴とする携帯用電動切断工具の速度制御装置。 In the speed control device of the portable electric cutting tool according to claim 1,
A speed control device for a portable electric cutting tool, characterized in that the speed control means performs overshoot control by reducing the responsiveness of the rotational speed feedback control to the electric motor. 請求項１又は２の携帯用電動切断工具の速度制御装置において、
携帯用電動切断工具は電動丸鋸であることを特徴とする携帯用電動切断工具の速度制御装置。 In the speed control device of the portable electric cutting tool according to claim 1 or 2,
A speed control device for a portable electric cutting tool, wherein the portable electric cutting tool is an electric circular saw.
JP2006012657A 2006-01-20 2006-01-20 Speed control device for portable electric cutting tool Expired - Fee Related JP4939065B2 (en)

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