JPH0421377A - Dynamic brake unit for synchronous motor - Google Patents
Dynamic brake unit for synchronous motorInfo
- Publication number
- JPH0421377A JPH0421377A JP12501590A JP12501590A JPH0421377A JP H0421377 A JPH0421377 A JP H0421377A JP 12501590 A JP12501590 A JP 12501590A JP 12501590 A JP12501590 A JP 12501590A JP H0421377 A JPH0421377 A JP H0421377A
- Authority
- JP
- Japan
- Prior art keywords
- synchronous motor
- rotational speed
- dynamic brake
- motor
- demagnetization
- 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
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 30
- 238000004804 winding Methods 0.000 claims abstract description 8
- 230000005347 demagnetization Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
Landscapes
- Stopping Of Electric Motors (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、産業用ロボットや工作機械などに使用される
同期電動機のダイナミックブレーキ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 dynamic braking device for a synchronous motor used in industrial robots, machine tools, and the like.
従来の技術
第２図は従来の同期電動機のダイナミックブレーキ装置
である。BACKGROUND OF THE INVENTION FIG. 2 shows a conventional dynamic braking device for a synchronous motor.
第２図において、１は同期電動機、２は同期電動機の運
転、停止を制御する制御手段としてのＣＰＵ、３は前記
ＣＰＵ２で演算された駆動波形信号を受けて電動機１に
駆動電流を流すインバータ回路。４はダイナミックブレ
ーキ接点で、前記ＣＰＵ２の指令を受けて同期電動機１
の固定子巻線を短絡する接点である。６はサーボオンオ
フ指令で電動１！ｌ！１の運転あるいは停止を指令する
。上記構成においてＣＰＵ２にサーボオフ指令６が入力
されると、ＣＰＵ２はインバータ回路３に与える駆動波
形信号を遮断してインバータ回路３針フし、電動１１！
１への電流供給を断つ一方サーボオフ指令６を反転した
、つｇ動作指令をダイナミックブレーキ接点４に送って
電動１１！１の固定子巻線を短絡し、電動機１はダイナ
ミックブレーキがか−って短時間で停止する。In FIG. 2, 1 is a synchronous motor, 2 is a CPU as a control means for controlling operation and stopping of the synchronous motor, and 3 is an inverter circuit that receives a drive waveform signal calculated by the CPU 2 and supplies a drive current to the motor 1. . 4 is a dynamic brake contact, which operates the synchronous motor 1 in response to a command from the CPU 2.
This is a contact point that shorts the stator windings. 6 is electric 1 with servo on/off command! l! Command to start or stop 1. In the above configuration, when the servo-off command 6 is input to the CPU 2, the CPU 2 cuts off the drive waveform signal given to the inverter circuit 3, turns off the inverter circuit 3, and the electric 11!
While cutting off the current supply to motor 1, the servo-off command 6 is reversed and a tsug operation command is sent to the dynamic brake contact 4 to short-circuit the stator winding of the motor 11!1, and the motor 1 is dynamically braked. Stops after a short time.
発明が解決しようとする課題
上記の従来例では、インバータ回路がオフになるとダイ
ナミックブレーキがか＼る方式になっている。同期電動
機の仕様と、インバータ回路がオフされた時の同期電動
機の回転数によっては、時には同期電動機が減磁するお
それもあった。回路設計者はそれを防止するために同期
電動機が減磁を起さないような適切な直列抵抗をダイナ
ミックブレーキ接点に挿入したシして面倒であった。Problems to be Solved by the Invention In the conventional example described above, the dynamic brake is activated when the inverter circuit is turned off. Depending on the specifications of the synchronous motor and the rotational speed of the synchronous motor when the inverter circuit is turned off, there is sometimes a risk that the synchronous motor may become demagnetized. To prevent this, circuit designers have had to insert an appropriate series resistor into the dynamic brake contact to prevent the synchronous motor from demagnetizing.
課題を解決するための手段
この目的を達成するために本発明は、インバータ回路に
よって駆動される同期電動機において、同期電動機の回
転子にロータリエンコーダなどの速度センサーを結合し
、前記速度センサーの信号を受けて電動機の速度を演算
する回転速度演算回路を設けて電動機の回転速度を把握
し、インバータ回路がオフであシかつ同期電動機の回転
数が固定子巻線を短絡しても減磁を起さない所定の回転
数以下の時に、前記ダイナミックブレーキ接点を閉じる
指令は号を出力してなる構成としたものである。つまシ
減磁のおそれがある高い回転速度ではダイナミックブレ
ーキがか−らないようにしている。Means for Solving the Problems To achieve this object, the present invention provides a synchronous motor driven by an inverter circuit, in which a speed sensor such as a rotary encoder is coupled to the rotor of the synchronous motor, and the signal of the speed sensor is coupled to the rotor of the synchronous motor. A rotation speed calculation circuit is installed to calculate the speed of the motor based on the rotational speed of the motor. The command to close the dynamic brake contact is outputted when the rotation speed is below a predetermined number. The dynamic brake is not applied at high rotational speeds where there is a risk of pawl demagnetization.
作 用
本発明は同期電動機の仕様と、停止指令時の同期電動機
の回転数によって固定子巻線に過大な短絡電流が流れる
のを防止し、同期電動機か減磁を起さない様にしている
。Function The present invention prevents excessive short-circuit current from flowing in the stator winding depending on the specifications of the synchronous motor and the rotational speed of the synchronous motor at the time of a stop command, thereby preventing demagnetization of the synchronous motor. .
実施例
以下、本発明の一実施例を第１図にもとづいて説明する
。ただし、第２図と同一のものは同一の番号を付し説明
を省略する。EXAMPLE Hereinafter, an example of the present invention will be described based on FIG. However, the same numbers as those in FIG. 2 are given the same numbers, and the explanation will be omitted.
第１図において、６は前記同期電動機１に直結すしたロ
ータリエンコーダなどの速度センサー７は前記速度セン
サー６の百号を受けて電動機の速度を演算する回転速度
演算回路で、電動機の回転速度がダイナミックブレーキ
で減磁しない所定のレベル以下である時にＣＰＵ２にＨ
出力を送るものである。In FIG. 1, a speed sensor 7 such as a rotary encoder directly connected to the synchronous motor 1 is a rotation speed calculation circuit that calculates the speed of the motor in response to the number 100 of the speed sensor 6. H is sent to CPU2 when the magnetization is below a predetermined level that does not cause demagnetization during dynamic braking.
It sends output.
上記構成において、ダイナミックブレーキ接点４への動
作指令はサーボオンオフ信号６の反転ト速度演算回路７
の出力のＡＮＤで与えられる。サーボオフ指令６で電動
機の停止が指令された時、インバータ回路３はたソちに
オフとなるが、電動機の回転速度が所定値よシ高いと回
転速度演算回路７の出力はＬレベルなのでダイナミック
ブレーキはか−らない。電動機の回転速度が下って来て
固定子巻線を短絡して減磁を起さない所定の回転数以下
になった時に、前記回転速度演算回路７の出力がＨに転
じサーボオフ信号６の反転は号とあいまってＣＰ＠から
の指令信号にもとづきダイナミックブレーキ接点４が動
作して電動機の固定子巻線を短絡し、ダイナミックブレ
ーキがか−るのである。In the above configuration, the operation command to the dynamic brake contact 4 is the inversion of the servo on/off signal 6 and the speed calculation circuit 7.
It is given by ANDing the outputs of . When the motor is commanded to stop using the servo-off command 6, the inverter circuit 3 is immediately turned off, but if the motor's rotational speed is higher than a predetermined value, the output of the rotational speed calculation circuit 7 is at L level, so the dynamic brake is activated. It's fleeting. When the rotational speed of the motor decreases to below a predetermined rotational speed that does not short-circuit the stator windings and cause demagnetization, the output of the rotational speed calculation circuit 7 changes to H, and the servo-off signal 6 is reversed. The dynamic brake contact 4 operates based on the command signal from CP@ in conjunction with the signal, shorting the stator windings of the motor and applying the dynamic brake.
発明の詳細
な説明したように、本発明は、ダイナミックブレーキに
よって、同期電動機が減磁を起す事がない使い勝手の良
いダイナミックブレーキ装置を提供するものである。DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides an easy-to-use dynamic brake device that does not cause demagnetization of a synchronous motor due to dynamic braking.
第１図は本発明の実施例で同期電動機のダイナミックブ
レーキ装置のブロック図、第２図は従来例の同期電動機
のダイナミックブレーキ装置のブロック図である。
１・・・・・・同期電動機、２・・・・・・ＣＰＵ、
３・・・・・・インバータ回路、４・・・・・・ダイナ
ミックブレーキ接点、５・・・・・・サーボオンオフ信
号、６・・・・・・速度センサー７・・・・・・回転速
度演算回路。FIG. 1 is a block diagram of a dynamic braking device for a synchronous motor according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional dynamic braking device for a synchronous motor. 1...Synchronous motor, 2...CPU,
3...Inverter circuit, 4...Dynamic brake contact, 5...Servo on/off signal, 6...Speed sensor 7...Rotation speed Arithmetic circuit.
Claims (1)
、前記電動機の回転速度を検出する速度センサーと前記
速度センサーの出力を受けて電動機の回転速度を演算す
る回転速度演算回路と、前記電動機の固定子巻線を短絡
するダイナミックブレーキ接点と、前記インバータ回路
がオフでありかつ電動機の回転速度が所定の値以下の時
に、前記ダイナミックブレーキ接点を閉じる指令信号を
出力してなる制御手段とを備えてなる同期電動機のダイ
ナミックブレーキ装置。A synchronous motor, an inverter circuit that drives the motor, a speed sensor that detects the rotational speed of the motor, a rotational speed calculation circuit that receives the output of the speed sensor and calculates the rotational speed of the motor, and a stator of the motor. A dynamic brake contact that short-circuits a winding; and control means that outputs a command signal to close the dynamic brake contact when the inverter circuit is off and the rotational speed of the motor is below a predetermined value. Dynamic braking device for synchronous motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12501590A JPH0421377A (en) | 1990-05-15 | 1990-05-15 | Dynamic brake unit for synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12501590A JPH0421377A (en) | 1990-05-15 | 1990-05-15 | Dynamic brake unit for synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0421377A true JPH0421377A (en) | 1992-01-24 |
Family
ID=14899752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12501590A Pending JPH0421377A (en) | 1990-05-15 | 1990-05-15 | Dynamic brake unit for synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0421377A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014054064A (en) * | 2012-09-06 | 2014-03-20 | Fanuc Ltd | Control apparatus for permanent magnet synchronizing motor for preventing irreversible demagnetization of permanent magnet and control system with the same |
| US9614466B2 (en) | 2014-05-20 | 2017-04-04 | Black & Decker Inc. | Electronic braking for a universal motor in a power tool |
| US11047528B2 (en) | 2016-02-12 | 2021-06-29 | Black & Decker Inc. | Electronic braking for a power tool having a brushless motor |
-
1990
- 1990-05-15 JP JP12501590A patent/JPH0421377A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014054064A (en) * | 2012-09-06 | 2014-03-20 | Fanuc Ltd | Control apparatus for permanent magnet synchronizing motor for preventing irreversible demagnetization of permanent magnet and control system with the same |
| US9614466B2 (en) | 2014-05-20 | 2017-04-04 | Black & Decker Inc. | Electronic braking for a universal motor in a power tool |
| US11047528B2 (en) | 2016-02-12 | 2021-06-29 | Black & Decker Inc. | Electronic braking for a power tool having a brushless motor |
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