JP3775559B2 - Induction motor control device - Google Patents
Induction motor control device Download PDFInfo
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- JP3775559B2 JP3775559B2 JP32567699A JP32567699A JP3775559B2 JP 3775559 B2 JP3775559 B2 JP 3775559B2 JP 32567699 A JP32567699 A JP 32567699A JP 32567699 A JP32567699 A JP 32567699A JP 3775559 B2 JP3775559 B2 JP 3775559B2
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- induction motor
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Description
【０００１】
【発明の属する技術分野】
この発明は、電圧形インバータにより給電され、負荷装置を駆動する誘導電動機の制御装置に関する。
【０００２】
【従来の技術】
従来、この種の誘導電動機の制御装置においては、指令される周波数設定値に基づいて電圧形インバータが出力する交流電力の周波数と電圧とを所望の値に制御し、この交流電力を誘導電動機に給電することにより該誘導電動機を可変速している。このとき、外部に設置した種々の測定器を用いて前記誘導電動機の回転速度を計測したり、該誘導電動機の一次電流波形を観測したりして該誘導電動機の回転速度の変化の滑らかさ，該回転速度の安定性などの駆動性能を評価し、該誘導電動機で駆動される負荷機器への適合性の判定資料としていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述の如き従来の評価方法では種々の測定器を設置するための十分な設置スペースを必要とし、また、該測定器も高価であり、得られた測定値や観測値も誘導電動機の回転速度の微小変化に対して十分ではなかった。
【０００４】
この発明の目的は、上記問題点を解決する誘導電動機の制御装置を提供することにある。
【０００５】
【課題を解決するための手段】
この第１の発明は、電圧形インバータにより給電され、負荷装置を駆動する誘導電動機の制御装置において、
前記制御装置が前記誘導電動機の回転速度を検出する速度検出手段と、この検出した回転速度に基づいて前記誘導電動機の加速度を演算する加速度演算回路と、演算された前記誘導電動機の加速度を加速度信号として外部へ送出するモニタ回路とを備えたことを特徴とする。
【０００６】
また第２の発明は、電圧形インバータにより給電され、負荷装置を駆動する誘導電動機の制御装置において、
前記負荷が前記誘導電動機の回転速度を変速する変速機構を備え
前記制御装置が前記誘導電動機の回転速度を検出する速度検出手段と、この検出した回転速度に基づいて前記誘導電動機の加速度を演算する加速度演算回路と、演算された前記誘導電動機の加速度に前記変速機構の変速比を乗ずる乗算回路と、この乗算回路で求められた乗算値を前記負荷装置の加速度信号として外部へ送出するモニタ回路とを備えたことを特徴とする。
【０００７】
この発明によれば、制御装置内部より送出される加速度信号は前記誘導電動機の回転速度の変化の滑らかさ，該回転速度の安定性をより拡大して変化するので、この加速度信号を単にオシロスコープなどで観測すればよく、従来の如く、外部に特別な測定器を設置することが不要となる。
【０００８】
また第２の発明によれば、前記負荷装置に備えるギヤ，プーリなどを介した負荷側の加速度信号を前記制御装置から得ることができる。
【０００９】
【発明の実施の形態】
図１は、この発明の第１の実施例を示す誘導電動機の制御装置の回路構成図である。
【００１０】
図１において、１は商用電源などの交流電源、２は半導体電力変換素子，該素子の駆動回路などで構成される電圧形インバータ、３は電圧形インバータ２より給電される誘導電動機、４は誘導電動機３で駆動される負荷装置、１０は誘導電動機３の制御装置である。
この制御装置１０には指令される周波数設定値ｆS の変更に伴って（図２（イ）参照）、予め設定された単位時間当りの加算値及び減算値に基づいて、最終的にはｆ* ＝ｆS になる周波数指令値ｆ* （図２（ロ）参照）を出力する加減速演算回路１１と、この周波数指令値ｆ* に対応する電圧指令値ｖ* を出力する周波数・電圧変換回路１２とは、図示しない従来例回路にも備えている制御要素であり、この周波数指令値ｆ* と電圧指令値ｖ* とにより電圧形インバータ２は周波数ｆ* ，電圧ｖ* の交流電力を誘導電動機３に供給し、誘導電動機３は周波数ｆ* に基づく同期速度に近い回転速度で回転する。
【００１１】
このとき、前記回転速度検出手段の一例としての誘導電動機３の出力軸に連結された増分方式のパルスエンコーダ３ａと、周知の技術により形成された速度演算回路１３とにより、上述の誘導電動機３の回転速度ｎ（図２（ハ）参照）を導出し、導出された回転速度ｎを加速度演算回路１４により微分演算して誘導電動機３の加速度α（図２（ニ）参照）を得る。さらにモニタ回路１５では、前記加速度αにバッファ素子などを介することにより、誘導電動機３の加速度信号として外部へ送出する。
【００１２】
この加速度信号の波形は誘導電動機３の回転速度の変化の滑らかさ，該回転速度の安定性を、加速度演算回路１４の微分動作に基づいて、より拡大したものになるので、この加速度信号を単にオシロスコープなどで観測すればよい。
【００１３】
図３は、この発明の第２の実施例を示す誘導電動機の制御装置の回路構成図であり、図１に示した実施例回路と同一機能を有するものには同一符号を付してここではその説明を省略する。
【００１４】
この制御装置１０ａには、図１に示した制御装置１０の加速度演算回路１４とモニタ回路１５との間に乗算回路１６が挿設されている。
【００１５】
すなわち、負荷装置４にギヤ，プーリなどを含むときには、その減速比または増速比Ｋを加速度演算回路１４で得られる誘導電動機３の加速度αに乗ずることにより、該負荷装置の加速度が得られ、この加速度をモニタ回路１５を介して、負荷装置４の加速度信号として外部へ送出できる。なお、Ｋ＝１とすれば、モニタ回路の出力は誘導電動機３の加速度信号となる。
【００１６】
【発明の効果】
この発明によれば、従来の如く外部に特別な測定器を設置することなく、制御装置内部より送出される加速度信号から誘導電動機の駆動性能をより精密に評価することができる。特に、近年のマイクロコンピュータによる誘導電動機のデジタル制御装置に好適である。
【図面の簡単な説明】
【図１】この発明の第１の実施例を示す誘導電動機の制御装置の回路構成図
【図２】図１の動作を説明する波形図
【図３】この発明の第２の実施例を示す誘導電動機の制御装置の回路構成図
【符号の説明】
１…交流電源、２…電圧形インバータ、３…誘導電動機、３ａ…パルスエンコーダ、４…負荷装置、１０，１０ａ…制御装置、１１…加減速演算回路、１２…周波数・電圧変換回路、１３…回転速度演算回路、１４…加速度演算回路、１５…モニタ回路、１６…乗算回路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for an induction motor that is powered by a voltage source inverter and drives a load device.
[0002]
[Prior art]
Conventionally, in this type of induction motor control device, the frequency and voltage of the AC power output from the voltage source inverter are controlled to desired values based on the commanded frequency setting value, and this AC power is supplied to the induction motor. The induction motor is variable speed by supplying power. At this time, the rotational speed of the induction motor is measured using various measuring devices installed outside, or the primary current waveform of the induction motor is observed to smooth the change in the rotational speed of the induction motor. The driving performance such as the stability of the rotational speed was evaluated and used as a material for determining suitability for a load device driven by the induction motor.
[0003]
[Problems to be solved by the invention]
However, the conventional evaluation methods as described above require a sufficient installation space for installing various measuring instruments, and the measuring instruments are also expensive, and the measured values and observed values obtained are not the same as the rotation of the induction motor. Not enough for small changes in speed.
[0004]
An object of the present invention is to provide a control device for an induction motor that solves the above problems.
[0005]
[Means for Solving the Problems]
This first invention is a control device for an induction motor that is fed by a voltage source inverter and drives a load device.
A speed detecting means and the control device detects the rotational speed of the induction motor, an acceleration calculation circuit and the computed acceleration signal of the acceleration of the induction motor to calculate the acceleration of the induction motor based on the rotational speed and the detected And a monitor circuit for sending to the outside.
[0006]
The second invention is a control device for an induction motor that is fed by a voltage source inverter and drives a load device.
The load includes a speed change mechanism that changes the rotational speed of the induction motor, and the control device calculates speed of the induction motor based on the detected speed and speed detecting means for detecting the rotational speed of the induction motor. An acceleration calculation circuit; a multiplication circuit that multiplies the calculated acceleration of the induction motor by a speed ratio of the transmission mechanism; and a monitor circuit that sends the multiplication value obtained by the multiplication circuit to the outside as an acceleration signal of the load device; It is provided with.
[0007]
According to the present invention, the acceleration signal sent from the inside of the control device changes with the smoothness of the change in the rotation speed of the induction motor and the stability of the rotation speed more enlarged. As in the conventional case, it is not necessary to install a special measuring instrument outside.
[0008]
According to the second aspect of the present invention, a load-side acceleration signal can be obtained from the control device via a gear, a pulley or the like provided in the load device.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a circuit configuration diagram of an induction motor control apparatus showing a first embodiment of the present invention.
[0010]
In FIG. 1, 1 is an AC power source such as a commercial power source, 2 is a semiconductor power conversion element, a voltage source inverter composed of a drive circuit for the element, 3 is an induction motor fed by the
In accordance with the change in the frequency setting value f S commanded to the control device 10 (see FIG. 2 (A)), finally, based on the preset addition value and subtraction value per unit time, f * = the acceleration and deceleration calculation circuit 11 which outputs a f S to become a frequency command value f * (see FIG. 2 (b)), the frequency and voltage and outputs a voltage command value v * corresponding to the frequency command value f * conversion The circuit 12 is a control element provided in a conventional circuit (not shown ), and the
[0011]
At this time, an incremental pulse encoder 3a connected to the output shaft of the
[0012]
The waveform of the acceleration signal is obtained by further expanding the smoothness of the change in the rotation speed of the
[0013]
FIG. 3 is a circuit configuration diagram of an induction motor control apparatus according to a second embodiment of the present invention. Components having the same functions as those of the embodiment circuit shown in FIG. The description is omitted.
[0014]
In the control device 10a, a multiplication circuit 16 is inserted between the acceleration calculation circuit 14 and the monitor circuit 15 of the
[0015]
That is, when the
[0016]
【The invention's effect】
According to the present invention, the driving performance of the induction motor can be more accurately evaluated from the acceleration signal sent from the inside of the control device without installing a special measuring instrument outside as in the prior art. In particular, it is suitable for a digital control device of an induction motor using a recent microcomputer.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram of an induction motor control apparatus showing a first embodiment of the present invention. FIG. 2 is a waveform diagram for explaining the operation of FIG. 1. FIG. 3 shows a second embodiment of the present invention. Circuit diagram of induction motor control device 【Explanation of symbols】
DESCRIPTION OF
Claims (2)
前記制御装置が、
前記誘導電動機の回転速度を検出する速度検出手段と、
この検出した回転速度に基づいて前記誘導電動機の加速度を演算する加速度演算回路と、
演算された前記誘導電動機の加速度を加速度信号として外部へ送出するモニタ回路とを備えたことを特徴とする誘導電動機の制御装置。In a control device for an induction motor that is fed by a voltage source inverter and drives a load device,
The control device is
Speed detecting means for detecting the rotational speed of the induction motor;
An acceleration calculation circuit for calculating the acceleration of the induction motor based on the detected rotation speed;
A control circuit for an induction motor, comprising: a monitor circuit that sends the calculated acceleration of the induction motor to the outside as an acceleration signal.
前記負荷が前記誘導電動機の回転速度を変速する変速機構を備え、
前記制御装置が、
前記誘導電動機の回転速度を検出する速度検出手段と、
この検出した回転速度に基づいて前記誘導電動機の加速度を演算する加速度演算回路と、
演算された前記誘導電動機の加速度に前記変速機構の変速比を乗ずる乗算回路と、
この乗算回路で求められた乗算値を前記負荷装置の加速度信号として外部へ送出するモニタ回路とを備えたことを特徴とする誘導電動機の制御装置。In a control device for an induction motor that is fed by a voltage source inverter and drives a load device,
The load includes a speed change mechanism that changes the rotational speed of the induction motor;
The control device is
Speed detecting means for detecting the rotational speed of the induction motor;
An acceleration calculation circuit for calculating the acceleration of the induction motor based on the detected rotation speed;
A multiplication circuit for multiplying the calculated acceleration of the induction motor by the speed ratio of the speed change mechanism ;
A control device for an induction motor, comprising: a monitor circuit for sending the multiplication value obtained by the multiplication circuit to the outside as an acceleration signal of the load device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32567699A JP3775559B2 (en) | 1999-11-16 | 1999-11-16 | Induction motor control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32567699A JP3775559B2 (en) | 1999-11-16 | 1999-11-16 | Induction motor control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001145391A JP2001145391A (en) | 2001-05-25 |
| JP3775559B2 true JP3775559B2 (en) | 2006-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32567699A Expired - Fee Related JP3775559B2 (en) | 1999-11-16 | 1999-11-16 | Induction motor control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3775559B2 (en) |
-
1999
- 1999-11-16 JP JP32567699A patent/JP3775559B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2001145391A (en) | 2001-05-25 |
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