JPH0539200U - DC motor controller - Google Patents

DC motor controller

Info

Publication number
JPH0539200U
JPH0539200U JP085574U JP8557491U JPH0539200U JP H0539200 U JPH0539200 U JP H0539200U JP 085574 U JP085574 U JP 085574U JP 8557491 U JP8557491 U JP 8557491U JP H0539200 U JPH0539200 U JP H0539200U
Authority
JP
Japan
Prior art keywords
control unit
motor
voltage
resistor
fet
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.)
Withdrawn
Application number
JP085574U
Other languages
Japanese (ja)
Inventor
良雄 飯村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP085574U priority Critical patent/JPH0539200U/en
Publication of JPH0539200U publication Critical patent/JPH0539200U/en
Withdrawn legal-status Critical Current

Links

Abstract

(57)【要約】 【目的】 本考案は直流モータ制御装置の改良に関する
もので、その目的はフライバックダイオードでは除去で
きないスパイク電圧を安価な素子を追加することによっ
て除去し、安価で信頼性の高い制御装置を得ることであ
る。 【構成】 電池2、モータ3と直列に接続されたFET
5にゲート信号を供給する制御部9に、FET5のオフ
及びスイッチ4のチャッタリング時に発生する過大なス
パイク電圧が印加されるのを防止するため、制御部9と
直列に抵抗10を接続すると共に定電圧ダイオード11
またはコンデンサ12を制御部9に並列に接続した。
(57) [Abstract] [Objective] The present invention relates to an improvement of a DC motor control device, and an object thereof is to remove spike voltage which cannot be removed by a flyback diode by adding an inexpensive element, thereby achieving an inexpensive and reliable operation. To get a high control device. [Structure] FET connected in series with battery 2 and motor 3
In order to prevent an excessive spike voltage generated when the FET 5 is turned off and the switch 4 is chattered from being applied to the control unit 9 that supplies a gate signal to the resistor 5, a resistor 10 is connected in series with the control unit 9. Constant voltage diode 11
Alternatively, the capacitor 12 is connected to the control unit 9 in parallel.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は直流式電動工具等に使用される直流モータの制御装置の改良に関する ものである。 The present invention relates to an improvement of a control device for a DC motor used in a DC power tool or the like.

【0002】[0002]

【従来の技術】[Prior Art]

従来技術になる制御装置を図4に示す。図4において、制御回路7は通常耐圧 が16V程度のIC類で構成されている。FET5の耐圧も60V程度のものが 使用される。そのため電流の断続によって発生する過大なスパイク電圧から制御 回路7やFET5を保護するため、モータ3に並列にフライバックダイオード6 が接続されている。従来技術においては、スパイク電圧に対する保護はフライバ ックダイオード6だけであった。 A conventional control device is shown in FIG. In FIG. 4, the control circuit 7 is usually composed of ICs having a withstand voltage of about 16V. The withstand voltage of the FET 5 is about 60V. Therefore, a flyback diode 6 is connected in parallel with the motor 3 in order to protect the control circuit 7 and the FET 5 from an excessive spike voltage generated by the interruption of the current. In the prior art, the flyback diode 6 was the only protection against spike voltage.

【0003】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

制御回路7に印加される電圧波形を微視的にみると図3の如くである。 すなわち、FET5がオンし電流が流れると電池2の電圧が下がり、FET5が オフすると電池2と制御回路7の間の配線によるインダクタンス分によってスパ イク電圧Vp1が発生する。また、ブレーキ端子4bがチャタリングを起こした 時もモータ3のインダクタンス分によってスパイク電圧Vp2が発生する。 Vp1、Vp2はフライバックダイオード6に対しては逆極性であるため、フラ ンバックダイオード6では吸収されない。 従って、従来技術においては過大なスパイク電圧で耐圧の低いIC類で構成さ れた制御回路7が時として破壊し変速不能になるという問題があった。更に高耐 圧のIC類を得ようとしても市販されておらず非常に高価なものになるという問 題もあった。 本考案の目的は、上記した欠点をなくし、安価で信頼性の高い制御装置を得る ことである。A voltage waveform applied to the control circuit 7 is microscopically observed as shown in FIG. That is, when the FET 5 is turned on and a current flows, the voltage of the battery 2 drops, and when the FET 5 is turned off, the spike voltage Vp 1 is generated due to the inductance due to the wiring between the battery 2 and the control circuit 7. Further, the spike voltage Vp 2 is generated by the inductance of the motor 3 even when the brake pin 4b is chattering. Since Vp 1 and Vp 2 have opposite polarities to the flyback diode 6, they are not absorbed by the flyback diode 6. Therefore, in the prior art, there is a problem that the control circuit 7 composed of ICs having a low withstand voltage due to an excessive spike voltage is sometimes destroyed and cannot be shifted. Further, there was a problem that even if an attempt was made to obtain ICs with high pressure resistance, they would not be commercially available and would be very expensive. An object of the present invention is to eliminate the above-mentioned drawbacks and obtain an inexpensive and highly reliable control device.

【0004】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

上記目的は制御部に直列に抵抗を接続し、並列に定電圧ダイオードあるいはコ ンデンサを接続することにより達成される。 The above object is achieved by connecting a resistor in series to the control unit and connecting a constant voltage diode or a capacitor in parallel.

【0005】[0005]

【作用】[Action]

上記のように接続された抵抗、定電圧ダイオードあるいはコンデンサは制御部 に加わる過大なスパイク電圧を除去するように動作する。 The resistor, constant voltage diode or capacitor connected as described above operates to eliminate an excessive spike voltage applied to the control unit.

【0006】[0006]

【実施例】【Example】

本考案の実施例を図1〜図3を参照して説明する。 図1において、制御装置1には電池2とモータ3が接続されている。制御装置 1は、スイッチ4、FET5、制御回路7、フライバックダイオード6等から構 成される。 スイッチ4はメイン端子4a、ブレーキ端子4b、コモン端子4cからなり、 メイン端子4a、コモン端子4c、モータ3、FET5が電池2に直列接続され る。フライバックダイオード6、コモン端子4cとブレーキ端子4bはモータ3 に並列に接続される。 制御回路7は、抵抗10と制御部9の直列回路と制御部9に並列に接続された 定電圧ダイオード11、可変抵抗8からなり、抵抗10と制御部9の直列回路は スイッチ4を介して電池2に接続される。 An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, a battery 2 and a motor 3 are connected to the control device 1. The control device 1 is composed of a switch 4, an FET 5, a control circuit 7, a flyback diode 6 and the like. The switch 4 includes a main terminal 4a, a brake terminal 4b, and a common terminal 4c. The main terminal 4a, the common terminal 4c, the motor 3, and the FET 5 are connected in series to the battery 2. The flyback diode 6, the common terminal 4c and the brake terminal 4b are connected in parallel to the motor 3. The control circuit 7 includes a series circuit of a resistor 10 and a control unit 9 and a constant voltage diode 11 and a variable resistor 8 connected in parallel to the control unit 9, and the series circuit of the resistor 10 and the control unit 9 is connected via a switch 4. It is connected to the battery 2.

【0007】 コモン端子4cがメイン端子4aに接続されると制御部9からFET5のゲー トにパルス信号が送られ、FET5がオン・オフを繰返しモータ3に矩形波電圧 が印加されモータ3が回転する。可変抵抗8を変化させるとパルス信号のデュー ティサイクルが変化しモータ3の回転数が変化する。When the common terminal 4c is connected to the main terminal 4a, a pulse signal is sent from the control unit 9 to the gate of the FET 5, the FET 5 repeatedly turns on and off, and a rectangular wave voltage is applied to the motor 3 to rotate the motor 3. To do. When the variable resistor 8 is changed, the duty cycle of the pulse signal is changed and the rotation speed of the motor 3 is changed.

【0008】 図3に示すように、制御回路7の電圧を微視的にみるとモータ3回転中はスパ イク電圧Vp1が、ブレーキ端子4bがチャタリングを起している時はスパイク 電圧Vp2が発生しているが、抵抗10、定電圧ダイオード11の作用により制 御部9に過大なスパイク電圧が印加されることはない。すなわち、制御回路7に 加わる電圧V1のピーク値は大きくても、制御部9に加わる電圧V2のピーク値は 十分小さいものとなる。As shown in FIG. 3, when the voltage of the control circuit 7 is viewed microscopically, the spike voltage Vp 1 is generated while the motor 3 is rotating, and the spike voltage Vp 2 is generated when the brake terminal 4b is chattering. However, an excessive spike voltage is not applied to the control unit 9 due to the action of the resistor 10 and the constant voltage diode 11. That is, although the peak value of the voltage V 1 applied to the control circuit 7 is large, the peak value of the voltage V 2 applied to the control unit 9 is sufficiently small.

【0009】 図2は本考案の他の実施例を示すもので、前記定電圧ダイオード11の代りに コンデンサ12を接続したもので、ほぼ上記と同様の効果を奏し得る。FIG. 2 shows another embodiment of the present invention, in which a capacitor 12 is connected instead of the constant voltage diode 11, and the same effect as above can be obtained.

【0010】[0010]

【考案の効果】[Effect of the device]

本考案によれば、安価な素子を追加することで制御部に加わる過大なスパイク 電圧を除去できるので、安価で信頼性の高い制御装置を得ることができる。 According to the present invention, since an excessive spike voltage applied to the control unit can be removed by adding an inexpensive element, an inexpensive and highly reliable control device can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本考案制御装置の一実施例を示す回路図。FIG. 1 is a circuit diagram showing an embodiment of a control device of the present invention.

【図2】 本考案の他の実施例を示す回路図。FIG. 2 is a circuit diagram showing another embodiment of the present invention.

【図3】 本考案を説明するための電圧波形図。FIG. 3 is a voltage waveform diagram for explaining the present invention.

【図4】 従来技術の一例を示す回路図。FIG. 4 is a circuit diagram showing an example of a conventional technique.

【符号の説明】[Explanation of symbols]

1は制御装置、2は電池、3はモータ、4はスイッチ、
5はFET、6はフライバックダイオード、7は制御回
路、8は可変抵抗、9は制御部、10は抵抗、11は定
電圧ダイオード、12はコンデンサである。
1 is a control device, 2 is a battery, 3 is a motor, 4 is a switch,
5 is an FET, 6 is a flyback diode, 7 is a control circuit, 8 is a variable resistor, 9 is a control unit, 10 is a resistor, 11 is a constant voltage diode, and 12 is a capacitor.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 電池、電源スイッチ、直流モータ及びス
イッチング素子からなる直列回路を有し、前記電源スイ
ッチを介して電池と直列に接続され、前記スイッチング
素子をオン・オフさせる信号を発生する制御部を設けた
ものにおいて、 前記制御部と直列に抵抗を接続すると共に制御部と並列
に定電圧ダイオードまたはコンデンサを接続したことを
特徴とする直流モータの制御装置。
1. A control unit having a series circuit composed of a battery, a power switch, a DC motor and a switching element, which is connected in series with the battery via the power switch and generates a signal for turning on / off the switching element. The DC motor control device according to claim 1, wherein a resistor is connected in series with the control unit and a constant voltage diode or a capacitor is connected in parallel with the control unit.
JP085574U 1991-10-21 1991-10-21 DC motor controller Withdrawn JPH0539200U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP085574U JPH0539200U (en) 1991-10-21 1991-10-21 DC motor controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP085574U JPH0539200U (en) 1991-10-21 1991-10-21 DC motor controller

Publications (1)

Publication Number Publication Date
JPH0539200U true JPH0539200U (en) 1993-05-25

Family

ID=13862587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP085574U Withdrawn JPH0539200U (en) 1991-10-21 1991-10-21 DC motor controller

Country Status (1)

Country Link
JP (1) JPH0539200U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012505623A (en) * 2008-10-10 2012-03-01 アイデーイーアソシエイツ(アイオーエム) リミテッド Power supply system and method for controlling a mechanically commutated motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012505623A (en) * 2008-10-10 2012-03-01 アイデーイーアソシエイツ(アイオーエム) リミテッド Power supply system and method for controlling a mechanically commutated motor

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19960208