JPS5828832B2 - Induction motor control device - Google Patents
Induction motor control deviceInfo
- Publication number
- JPS5828832B2 JPS5828832B2 JP53118752A JP11875278A JPS5828832B2 JP S5828832 B2 JPS5828832 B2 JP S5828832B2 JP 53118752 A JP53118752 A JP 53118752A JP 11875278 A JP11875278 A JP 11875278A JP S5828832 B2 JPS5828832 B2 JP S5828832B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- output
- voltage
- rotation speed
- regulator
- 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.)
- Expired
Links
Landscapes
- Control Of Ac Motors In General (AREA)
Description
【発明の詳細な説明】
この発明は、可変電圧・可変周波数電源による誘導電動
機の可変速運転に好適な制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device suitable for variable speed operation of an induction motor using a variable voltage/variable frequency power source.
誘導電動機の最も一般的な制御力法として、電圧・周波
数比の一定に保つ速度制御方法が知られており、その電
源としてはトランジスタ、サイリスク等の半導体を用い
た電圧形インバータが使用される。As the most common control force method for induction motors, a speed control method that maintains a constant voltage/frequency ratio is known, and a voltage source inverter using semiconductors such as transistors and SIRISK is used as the power source.
この制御方法においては、電動機の負荷としてトルク一
定負荷又は２乗トルク負荷などの場合には問題とならな
いが、工作機檄などのように、負荷が定電力（定出力）
特性を有する場合には下記式から明らかなように軸出力
ＰＧ一定において電動機回転数ｎが低くなるとトルクτ
が大きくなる。This control method does not pose a problem if the load on the motor is a constant torque load or a squared torque load, but if the load is a constant power (constant output) load such as in a machine tool
As is clear from the formula below, when the motor rotation speed n decreases at a constant shaft output PG, the torque τ
becomes larger.
Ｐ −に−ｎ・τ ・・・・・・・・・（１）ｋは
定数である。P − to −n·τ (1) k is a constant.
この場合、インバータの出力電圧は、電圧・周波数比（
Ｖ／Ｆ）一定制御をしているため、回転数低下で出力電
圧が低下しており、回転数が高い場合と同じ速度−トル
ク特性を有する電動機であっても低速ではトルクが大き
くなった分だけ電動機電流が増加し、損失の増力口から
効率低下、過熱等の問題がある。In this case, the output voltage of the inverter is the voltage-frequency ratio (
V/F) Because of constant control, the output voltage decreases as the rotation speed decreases, and even if the motor has the same speed-torque characteristics as when the rotation speed is high, the torque increases at low speeds. As the motor current increases, there are problems such as reduced efficiency and overheating due to power loss.
また、インバータ出力電圧が低下すると、一定の出力を
出すためには電流が増力口し、インパーク内部の発熱損
失の増力口を起し、インバータの利用効率が悪くなるし
、場合によっては使用半導体の定格を越える可能性もあ
ることからインパークの容量増しを必要とする。In addition, when the inverter output voltage decreases, the current must be increased in order to produce a constant output, which increases the power of heat loss inside the impark, reducing the inverter's utilization efficiency, and in some cases, the use of semiconductors Since there is a possibility of exceeding the rating, it is necessary to increase the impark capacity.
この発明は上述の問題点に鑑みてなされたもので、定出
力特性を持つ負荷に対してもインパークおよび電動機の
利用効率を向−ヒすること、特に速度調節器を有する可
変電圧・可変周波数電源において電動機の基底回転数以
上の領域ではＶ／Ｆ一定制御から円滑に定電力制御に移
行できるようにした制御装置を提供することを目的とす
る。This invention has been made in view of the above-mentioned problems, and is intended to improve the impark and utilization efficiency of the motor even for loads with constant output characteristics, and in particular to improve the efficiency of use of the motor with variable voltage and variable frequency speed regulators. It is an object of the present invention to provide a control device that can smoothly shift from constant V/F control to constant power control in a region above the base rotational speed of an electric motor in a power source.
第１図はこの発明制御装置構成図である。FIG. 1 is a block diagram of the control device of this invention.
インバータ本体１は交流電力を直流電力に電圧制御した
変換をする順変換器又は電圧制御機能をチョッパ等に持
たせた直流電源を入力側に持ち、可変電圧・可変周波数
の交流を誘導電動機２に供給する。The inverter main body 1 has a forward converter that converts AC power into DC power under voltage control or a DC power supply with a chopper or the like having a voltage control function on the input side, and supplies variable voltage/variable frequency AC to the induction motor 2. supply
電動機２の速度指令は設定器３の信号を単一積分器等の
加減速調整器４を通して与えられ、この指令信号は電動
機２の回転数ｎを比較入力に持つ速度調節器ＡＳＲ５の
入力にされる。The speed command for the electric motor 2 is given by a signal from a setting device 3 through an acceleration/deceleration regulator 4 such as a single integrator, and this command signal is input to a speed regulator ASR5 which has the rotation speed n of the electric motor 2 as a comparison input. Ru.
速度調節器５の出力は加減速調整器４の出力に加算され
、電圧リミッタＬＭ６を通して電圧調節器ＡＶＲ７の入
力にされる。The output of the speed regulator 5 is added to the output of the acceleration/deceleration regulator 4, and is input to the voltage regulator AVR7 through the voltage limiter LM6.
電圧リミッタ６は基底回転数に電圧制限レベルを持ち、
基底回転数以上の範囲で出力電圧を一定に制限する。The voltage limiter 6 has a voltage limit level at the base rotation speed,
Limits the output voltage to a constant value in the range above the base rotation speed.
電圧調節器７はインバータ本体１の出力電圧■を帰還信
号として入力し、その出力はインバータ電流Ｉをマイナ
ループとする電流調節器ＡＣＲ８を通して移相器９に与
えられ、移相器９によりインバータ本体１の順変換器又
はチョッパ等の直流電源主回路素子の通流率制御をし、
直流電圧（インバータ出力電圧）を制御する。The voltage regulator 7 inputs the output voltage ■ of the inverter main body 1 as a feedback signal, and its output is given to the phase shifter 9 through the current regulator ACR8 which uses the inverter current I as a minor loop. Controls the conduction rate of DC power main circuit elements such as forward converters or choppers,
Controls DC voltage (inverter output voltage).
−力、インバータの出力周波数を制御する周波数制御系
は、回転数ｎと速度調節器５の出力とが加算され、この
信号はインバータ出力電圧■との大小が比較されて大き
い信号がアクティブフィルタ１０でリップルが除去され
て電圧−周波数変換器１１に与えられ、周波数信号でイ
ンバータ本体１のインバータ主回路素子の０Ｎ−ＯＦＦ
周期が制御される。- In the frequency control system that controls the output frequency of the inverter, the rotation speed n and the output of the speed regulator 5 are added, and this signal is compared in magnitude with the inverter output voltage ■. The ripples are removed and the signal is applied to the voltage-frequency converter 11, and the frequency signal is used to turn the inverter main circuit elements of the inverter body 1 ON-OFF.
The period is controlled.
こうした制御装置において、設定器３により速度指令が
与えられ、加減速調整器４の設定時間が経過すると、電
動機２の回転数は速度指令に等しくなる。In such a control device, a speed command is given by the setting device 3, and when the set time of the acceleration/deceleration regulator 4 has elapsed, the rotational speed of the electric motor 2 becomes equal to the speed command.
この場合、速度指令が基底回転数（Ｖ／Ｆ一定制御領域
の上限の回転数）以下であれば電圧ノミツタ６のリミッ
タ動作がなされず、インバータ出力電圧及び周波数は速
度指令信号に対する出力電圧■の比較で一定比に制御さ
れる。In this case, if the speed command is below the base rotation speed (the upper limit rotation speed of the V/F constant control area), the limiter operation of the voltage limiter 6 is not performed, and the inverter output voltage and frequency are Controlled to a constant ratio by comparison.
速度指令が基底回転数以上に設定された場合には、電圧
リミッタがリミッタ動作をし、インパークの出力電圧■
は指令に拘らず一定となる。When the speed command is set above the base rotation speed, the voltage limiter operates as a limiter and the output voltage of impark is reduced.
remains constant regardless of the command.
このとき、電動機回転数ｎは速度指令に対応する値とな
らないため、速度をさらに増加する方向に速度調節器５
の出力が変化し、この速度調節器５の出力と電動機回転
数ｎが加算されて電圧−周波数変換器１１に加えられる
。At this time, the motor rotation speed n does not correspond to the speed command, so the speed regulator 5
The output of the speed regulator 5 and the motor rotation speed n are added and applied to the voltage-frequency converter 11.
これによって、インパークの出力周波数は増加し電動機
回転数ｎが上昇する。As a result, the output frequency of the impark increases and the motor rotation speed n increases.
そして、回転数ｎが速度指令に等しくなると速度調節器
５の出力はＯ■になり、インバータは回転数ｎによって
制御されることになる。When the rotational speed n becomes equal to the speed command, the output of the speed regulator 5 becomes O■, and the inverter is controlled by the rotational speed n.
この結果、基底回転数以上の領域では電圧■が一定で周
波数ｆが変化するという第２図に示すような電圧−周波
数特性になる。As a result, a voltage-frequency characteristic as shown in FIG. 2 is obtained in which the voltage (2) is constant and the frequency (f) changes in the region above the base rotational speed.
ｆｏば基底回転数に相当し、ｆｏ以上の周波数領域に定
出力制御を可能にする。fo corresponds to the base rotational speed, and enables constant output control in a frequency range above fo.
なお本発明は定電力制御のほかに、既設電動機の昇速運
転及び一般的な速度調節器による回転数制御にも適用で
きる。In addition to constant power control, the present invention can also be applied to increased speed operation of an existing electric motor and rotation speed control using a general speed regulator.
以上のとおり、この発明による制御方式は、速度調節器
を備える制御装置において、電動機の基底回転数までは
Ｖ／Ｆ一定制御をし、基底回転数以上の領域では電圧制
御から回転数制御に移行させるため、電動機の安定な制
御ができると共に定電力制御が可能になる。As described above, the control method according to the present invention, in a control device equipped with a speed regulator, performs constant V/F control up to the base rotation speed of the motor, and shifts from voltage control to rotation speed control in the region above the base rotation speed. Therefore, stable control of the motor and constant power control are possible.
第１図はこの発明による誘導電動機の制御装置を説明す
るための構成図、第２図はこの発明の制御装置による電
動機電源の電圧−周波数特性図である。
１：インバータ本体、２：誘導電動機、３：速度設定器
、４：加減速調整器、５：速度調節器、６：電圧リミッ
タ、７：電圧調節器、８：電流調節器、９：移相器、１
０ニアクチイブフイルタ、１１：電圧−周波数変換器。FIG. 1 is a configuration diagram for explaining a control device for an induction motor according to the present invention, and FIG. 2 is a voltage-frequency characteristic diagram of a motor power supply by the control device according to the present invention. 1: Inverter body, 2: Induction motor, 3: Speed setting device, 4: Acceleration/deceleration regulator, 5: Speed regulator, 6: Voltage limiter, 7: Voltage regulator, 8: Current regulator, 9: Phase shift vessel, 1
0 Near active filter, 11: Voltage-frequency converter.
Claims (1)
器を制御系に持つ可変電圧・可変周波数電源により該誘
導電動機を可変速運転するにおいて、上記電源の制御装
置は上記速度調節器の出力を誘導電動機の基底回転数に
相当するレベルに制限するリミッタと、このリミッタの
出力に応じて上記電源の出力電圧を制御する手段と、誘
導電動機の回転数に上記速度調節器の出力をカ目算する
手段と、この力目算手段の出力値と前記電源の出力電圧
相当値とのうち大きい刀を選択してそれに応じて上記電
源の周波数を制御する手段とを備えていることを特徴と
する誘導電動機の制御装置。1. When the induction motor is operated at variable speed by a variable voltage/variable frequency power supply having a speed regulator in the control system that makes the speed of the induction motor equal to the speed command, the control device of the power supply induces the output of the speed regulator. A limiter that limits the rotation speed to a level corresponding to the base rotation speed of the electric motor, means for controlling the output voltage of the power supply according to the output of the limiter, and means for calculating the output of the speed regulator to the rotation speed of the induction motor. and means for selecting the larger of the output value of the force calculation means and the output voltage equivalent value of the power source and controlling the frequency of the power source accordingly. Control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53118752A JPS5828832B2 (en) | 1978-09-27 | 1978-09-27 | Induction motor control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53118752A JPS5828832B2 (en) | 1978-09-27 | 1978-09-27 | Induction motor control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5546895A JPS5546895A (en) | 1980-04-02 |
| JPS5828832B2 true JPS5828832B2 (en) | 1983-06-18 |
Family
ID=14744170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53118752A Expired JPS5828832B2 (en) | 1978-09-27 | 1978-09-27 | Induction motor control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5828832B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5031331A (en) * | 1973-05-15 | 1975-03-27 | ||
| JPS5396111A (en) * | 1977-01-31 | 1978-08-23 | Mitsubishi Electric Corp | Induction motor control circuit for electric car |
-
1978
- 1978-09-27 JP JP53118752A patent/JPS5828832B2/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5031331A (en) * | 1973-05-15 | 1975-03-27 | ||
| JPS5396111A (en) * | 1977-01-31 | 1978-08-23 | Mitsubishi Electric Corp | Induction motor control circuit for electric car |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5546895A (en) | 1980-04-02 |
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