JPS6077697A - Speed controller of ac motor - Google Patents
Speed controller of ac motorInfo
- Publication number
- JPS6077697A JPS6077697A JP58183812A JP18381283A JPS6077697A JP S6077697 A JPS6077697 A JP S6077697A JP 58183812 A JP58183812 A JP 58183812A JP 18381283 A JP18381283 A JP 18381283A JP S6077697 A JPS6077697 A JP S6077697A
- Authority
- JP
- Japan
- Prior art keywords
- output
- inverter
- power factor
- voltage
- motor
- 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
Classifications
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、交流電動機を可変速運転する為の制御装置
、７に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a control device 7 for variable speed operation of an AC motor.
従来、この種の裁置として第１図〜第３図に示すものか
あつ１こ。第１図において（１）は商用７Ｊ源、（２）
は商用電源（１）に接続された整流器で交流を直流にＩ
ｄ流し、平滑リアクトル（３）、平滑コンデンサ（４）
からなる平滑回路にて脈動分の小さい直流に変換してい
る。（５）はインバータで第３図に示す如く（５ａ）〜
（５ｆ）の６個のスイッチング素子にて構成される。イ
ンバータ（５）は直流全交流に貨ｉ・θ［７、交流電動
機（６）に供給する。第２図に示す（７）は速度設定器
でこの出力は傾斜信号発生器（８）に入力される。Conventionally, this type of arrangement is shown in FIGS. 1 to 3. In Figure 1, (1) is a commercial 7J source, (2)
converts alternating current to direct current with a rectifier connected to the commercial power supply (1)
d Sink, smoothing reactor (3), smoothing capacitor (4)
It is converted into direct current with small pulsation by a smoothing circuit consisting of. (5) is an inverter as shown in Figure 3 (5a) ~
It is composed of six switching elements (5f). The inverter (5) supplies direct current and total alternating current (i·θ[7) to the AC motor (6). (7) shown in FIG. 2 is a speed setting device, and its output is input to a slope signal generator (8).
傾斜信号発生器（８）の出力は、電圧パターン発生回路
（９）、基糸正弦波発生回路θ０に入力される。（１カ
は乗算器で電圧パターン発生回路（９）の出力と基準正
強彼発、主回路ａＱの出力を乗算し、″酢圧パターンに
比例した正弦波を得ている。＋１３１は比較器で乗で１
γ器（勿の出力と三角波発生回路（ＩＩ）の出力全比較
し、分配器（１４１に入力している。The output of the slope signal generator (8) is input to a voltage pattern generation circuit (9) and a base thread sine wave generation circuit θ0. (1 is a multiplier that multiplies the output of the voltage pattern generation circuit (9) by the output of the reference voltage pattern generator and main circuit aQ to obtain a sine wave proportional to the vinegar pressure pattern. +131 is a comparator 1 to the power
The outputs of the gamma generator (of course) and the outputs of the triangular wave generating circuit (II) are all compared and input to the distributor (141).
次に動作について説明する。第１１／１〜２’ｌＳ ３
図は交流電動機を可変速逆転する制御義ＩＬの従来例を
示したもので、商用゛１ヒ源（１）から供給される交ｂ
１ε電池を整流器（２）によシ直流に長流し平滑りアク
１−ル（３）と平滑コンデンサ（４）からなる平ｊ“ぼ
１ｉＬＩＩ１１ｆｉにて、脈動分の少ない直流に平滑し
、インパーク（５）に供給する。インバータ（５）は、
６個（５ａ〜５ｆ）のトランジスタおよび逆並列に接続
される帰還用ダイオードからなるスイッチング素子によ
シ構成されておシ、後述するパルス幅制御方式（以下、
ＰＷＭ方式という）によシ、直流電圧を可変電圧、可変
周波数の交流に変換し、交流型！！！Ｉ ｍ （６）に
印加することによシ、交流電動機（６）を可匿速運転す
るものである。Next, the operation will be explained. 11/1~2'lS 3
The figure shows a conventional example of a control IL that reverses an AC motor at variable speed.
A 1ε battery is passed through a rectifier (2) to a long DC current, and is smoothed to a DC current with less pulsation by a flattened electric current consisting of a smoothing actuator (3) and a smoothing capacitor (4). (5).The inverter (5) is
It is composed of a switching element consisting of six transistors (5a to 5f) and a feedback diode connected in antiparallel, and uses a pulse width control method (hereinafter referred to as
(PWM method) converts DC voltage to variable voltage, variable frequency AC, making it an AC type! ! ! By applying the voltage to I m (6), the AC motor (6) is operated at a concealed speed.
次に制御回路の動作について述べる。図に示す制御回路
の方式は基糸正弦波と三角波と全比較し７て行なう正弦
波ＰＷＭ方式で、インバータ出力の電圧制御は、正弦波
の波高値全変化させることによシ行ない、また周波数制
御は正弦波の発生周波数全制御することによシ行なうも
のである。又流電動機（６）の運転速度は速度設定器（
７）によシ設足される。設定器（７）の出力は頃斜信号
発生器（８）に入力され、ランプ時限を発生して設定器
（７）の急変をおさえている。Next, the operation of the control circuit will be described. The system of the control circuit shown in the figure is a sine wave PWM system that performs 7 complete comparisons between a basic sine wave and a triangular wave.The voltage control of the inverter output is performed by completely changing the peak value of the sine wave, and the frequency Control is performed by controlling the entire frequency of the sine wave. In addition, the operating speed of the current motor (6) is determined by the speed setting device (
7) will be added. The output of the setting device (7) is input to a ramp signal generator (8), which generates a ramp time period to suppress sudden changes in the setting device (7).
煩斜信号発生器（８）の出力は電圧パターン発生回路（
９）及び基準正弦波発生回路αｑに入力される。電圧パ
ターン発生回路（９）はインバータ（５）の出力電圧を
決めるｔこめのちので交流電動機（６）の運転周波数に
対して最適な印加７ａ圧になるように設定される。The output of the oblique signal generator (8) is output from the voltage pattern generation circuit (
9) and is input to the reference sine wave generation circuit αq. Since the voltage pattern generation circuit (9) determines the output voltage of the inverter (5), it is set so that the applied voltage 7a is optimal for the operating frequency of the AC motor (6).
基準正弦発生回路ＱＱは、インバータ（５）の出力周波
数を決めるたものもので設定器（７）の出力に応じた周
波数の正弦波信号を発生している。乗算器篠は基準正弦
波信号を電圧パターン発生回路（９）の出力に応じた波
第４図■に示す高値の正弦波信９ Ａに変換し、比較器
０粉に入力している。三角波発生回路［＋１１は、上記
基準正弦波信号に同勘し、かつ整数倍の周波数で波高値
一定の第４図■に示す三角波Ｂｋ発生するｔこめのもの
で出力は比較器（１３１の一方に入力される。比較器θ
Ｊは第４図（ａ）の如く、正弦波波高値と三角波信号と
全比１咬して第４図（ｂ）のようにＰ酷１信号を得て分
配器θ萄に入力している。分配器（ｌ→はＰ■１信号を
インバータ（５） ’ｉ＜ ｉ：４成する６個（ｓａ−
＋ｆ）のスイッチング素子に第４図（ｃ） （ｄｉの如
くＰ側、Ｎ側信号を分配している。この１）！ｉ、スイ
ッチング素子のスイッチング時間遅れにともなうアーム
短絡を防ぐ為、Ｐ−Ｎアームッｒ２子（５ａと５ｂ、５
ｃと５ｄ、 ５ｅと５ｆ）には数工ｏ ｐ ｓ ｅ ｃ
Ｍ間、ともにＯＦＦとなるインターロック時間（第４白
中のΔｔ）を設けている。The reference sine generating circuit QQ determines the output frequency of the inverter (5) and generates a sine wave signal of a frequency corresponding to the output of the setting device (7). The multiplier Shino converts the reference sine wave signal into a high value sine wave signal 9 A shown in FIG. The triangular wave generating circuit [+11 is the same as the reference sine wave signal mentioned above and generates the triangular wave Bk shown in FIG. is input to the comparator θ
As shown in Fig. 4 (a), J combines the sine wave peak value and the triangular wave signal into a total ratio of 1 to obtain a P signal as shown in Fig. 4 (b), which is input to the distributor θ. . Distributor (l→ is P■ 1 signal is inverter (5)
Figure 4(c) (P side and N side signals are distributed as in di. This 1)! i. In order to prevent arm short circuit due to switching time delay of switching element, P-N arm r2 (5a and 5b, 5
c and 5d, 5e and 5f) have several operations.
An interlock time (Δt in the fourth white) is provided during which both are turned off.
従来の交流電動機の制御装置は以上のように構成されて
いるので、インバータの出力電圧は設定値に対して、負
荷力率によシ変動する。特に低速度域では、設定値に対
する変動分の割合が大きく、交流電動機を安定に運転出
来ない欠点があつｔこ。Since the conventional AC motor control device is configured as described above, the output voltage of the inverter varies with respect to the set value depending on the load power factor. Particularly in the low speed range, the proportion of fluctuation relative to the set value is large, making it difficult to operate the AC motor stably.
この発明は、上記のような従来のものの欠点を除去する
為になされたもので、インバータ出力の力率を検出し電
圧設定値全検出信号にて補正することによシ、低速域で
も安定に運転出来る制御装置を提案するものである。This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by detecting the power factor of the inverter output and correcting it using the voltage setting value total detection signal, it is stable even in the low speed range. We propose a control device that can be operated.
以下、この発明の一実施例を図について説明する。第５
図は、この発明の一実施例を示しておシ、第１図〜第２
図と同一符号は同一のものを示し、θυは、インバータ
（５）の出力の負荷力率全検出する力率センサ、（１＠
は電圧パターン発生回路（９）の電圧設定出力音、上記
力率センサ（国の出力にて差動的に補正する補正回路で
ある。An embodiment of the present invention will be described below with reference to the drawings. Fifth
The figures show one embodiment of the present invention.
The same symbols as in the figure indicate the same things, and θυ is a power factor sensor that detects the entire load power factor of the output of the inverter (5), (1@
is a correction circuit that differentially corrects the voltage setting output sound of the voltage pattern generation circuit (9) and the output of the power factor sensor (national power).
このように構成されたものにおいて、 ＰＩが（方式で
はインバータにて、出力°電圧及び出力周波数に同時に
制御している。出力電圧は三角波と比較する正弦波の波
高値を変えることによって制御することは前述の通シで
ある。In a device configured in this way, the PI (in this method, the output voltage and output frequency are simultaneously controlled by an inverter.The output voltage is controlled by changing the peak value of the sine wave compared to the triangular wave. is the same as above.
一般的には、低周波数域では出力電圧も低くする必要が
あシ、この為正弦波波高値を低くし、また正弦波の一周
期内に含まれる三角波の個敵全多くすることにより、イ
ンバータ出力’ｉｆ流波形金、よシ正弦波に近似させて
いる。この犠合、アーム短絡防止用に設けているインタ
ーロック時間（第４図のΔｔ）が出力電圧に与える影ｐ
Ｂｑｓが無視出来なくなシ、インバータ出力の力率によ
って、インバータ出力電圧が戊勧する。Generally, it is necessary to lower the output voltage in the low frequency range, so by lowering the sine wave peak value and increasing the total number of triangular waves included in one period of the sine wave, the inverter The output 'if current waveform is approximated to a sine wave. In this case, the interlock time (Δt in Fig. 4) provided to prevent arm short circuit has an effect on the output voltage p.
When Bqs cannot be ignored, the inverter output voltage decreases depending on the power factor of the inverter output.
第５図に示す一実ｈ＆例ではインバータ墓の出力の力率
？力率センサ（１５１にて検出し、補正回路（Ｉυにて
電圧パターン発生回路（９）の出力、すなわち電圧設定
値全補正し、インバータ帆の出力電圧がほぼ設定値なる
ように、正弦波波高値全制御するように構成している。In the example shown in Figure 5, what is the power factor of the output of the inverter? It is detected by the power factor sensor (151), and the correction circuit (Iυ) completely corrects the output of the voltage pattern generation circuit (9), that is, the voltage setting value, and generates a sine wave wave so that the output voltage of the inverter sail is almost the set value. It is configured to fully control high values.
第６図は、力率センサ０６）の人出力持性を示す。FIG. 6 shows the human power characteristics of the power factor sensor 06).
即ち、力率センサ（１６）の出力は、第６図に示す如く
力率が悪くなるに従い大きくなる。第５図の実施例では
、インバータ出力電圧は、力率が悪くなるに従い高くな
る傾向があるため、補正回路−にて電圧パターン発生回
路（９）の出力、すなわち電圧設定値を低くなるように
補償をかけることによシ、インバータ出力電圧は力率の
変化にかかわらずほぼ一定に制御出来る。That is, the output of the power factor sensor (16) increases as the power factor worsens, as shown in FIG. In the embodiment shown in FIG. 5, since the inverter output voltage tends to increase as the power factor worsens, the correction circuit lowers the output of the voltage pattern generation circuit (9), that is, the voltage setting value. By applying compensation, the inverter output voltage can be controlled to be almost constant regardless of changes in the power factor.
以上のように、この発明によれば、電圧パターン発生回
路の出力に補正回路を設け、インバータ出力電圧が設定
値になるように構成したので、装置の安定性が向上し、
また精度の高い特性が得られる効果がある。As described above, according to the present invention, the correction circuit is provided at the output of the voltage pattern generation circuit, and the inverter output voltage is configured to be the set value, so that the stability of the device is improved.
Moreover, there is an effect that highly accurate characteristics can be obtained.
第１図は交流電動機の速度制御装置の主回路図、第２図
は従来の交流電動機の制御装置の制御回路構成図、第３
図はインバータの構成図、第４図は第２図各部の動作波
形図、第５図はとの以明の一実施例による交流電動機の
速度制御族；直の制御回路構成図、第６図は力率センサ
の入出力特性を示す特性図である。
図中、（１）は商用電源、（２）は整流器、（３）は平
、・１すりアクトＩし、（４）は平滑コンデンサ、（５
）はインバータ、（６）は交流電動機、（７）は速度設
定器、（８）は傾斜信号発生器、（９）は電圧パターン
発生回路、θＱは基準正弦波発生回路、（ｌｌ］は三角
波発生回路、（１２１は乗算器０騰は比較器、（１→は
分配器、（１υは力率センサ、（１０）は補正回路。
なお、図中同一符号は同一もしくは相当部分を示す。
代理人 大岩増雄
第１図
第２図
第３Ｖ４
第４１４Fig. 1 is a main circuit diagram of a speed control device for an AC motor, Fig. 2 is a control circuit configuration diagram of a conventional AC motor control device, and Fig. 3 is a main circuit diagram of a speed control device for an AC motor.
Figure 4 is a diagram of the configuration of the inverter, Figure 4 is an operating waveform diagram of each part of Figure 2, Figure 5 is a diagram of the speed control group of the AC motor according to an embodiment of the present invention; Figure 6 is a diagram of the direct control circuit. is a characteristic diagram showing input/output characteristics of a power factor sensor. In the figure, (1) is a commercial power supply, (2) is a rectifier, (3) is a flat, 1-slip actuator, (4) is a smoothing capacitor, (5)
) is the inverter, (6) is the AC motor, (7) is the speed setting device, (8) is the slope signal generator, (9) is the voltage pattern generation circuit, θQ is the reference sine wave generation circuit, (ll) is the triangular wave Generation circuit, (121 is a multiplier, 0 is a comparator, (1→ is a distributor, (1υ is a power factor sensor, (10) is a correction circuit. In addition, the same reference numerals in the figure indicate the same or equivalent parts. People Masuo Oiwa Figure 1 Figure 2 Figure 3V4 414
Claims (1)
制御方式のインバータにて交流電動機を可変速運転する
制御装置において、インバータに接続される負荷の力率
全検出する力率検出手段、この力率検出手段の出力にて
上記インバータの電圧設定値を補正する補正手段全備え
てなることを４’＆徴とする交流電動機の速度制御装置
。In a control device for operating an AC motor at variable speed using an inverter using a pulse width control method, the power factor detecting means detects the entire power factor of a load connected to the inverter; 4. A speed control device for an AC motor, comprising a correction means for correcting the voltage setting value of the inverter based on the output of the power factor detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58183812A JPS6077697A (en) | 1983-09-30 | 1983-09-30 | Speed controller of ac motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58183812A JPS6077697A (en) | 1983-09-30 | 1983-09-30 | Speed controller of ac motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6077697A true JPS6077697A (en) | 1985-05-02 |
Family
ID=16142299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58183812A Pending JPS6077697A (en) | 1983-09-30 | 1983-09-30 | Speed controller of ac motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6077697A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63228992A (en) * | 1987-03-17 | 1988-09-22 | Hitachi Ltd | Inverter controller |
| JPH0198010A (en) * | 1987-10-12 | 1989-04-17 | Aretsukusu Denshi Kogyo Kk | Automatic power factor controller |
| JPH0198009A (en) * | 1987-10-12 | 1989-04-17 | Aretsukusu Denshi Kogyo Kk | Automatic power factor controller |
| JPH01197819A (en) * | 1988-02-02 | 1989-08-09 | Aretsukusu Denshi Kogyo Kk | Automatic power controller for inductive load |
| JPH01206420A (en) * | 1988-02-15 | 1989-08-18 | Aretsukusu Denshi Kogyo Kk | Automatic power factor controller |
-
1983
- 1983-09-30 JP JP58183812A patent/JPS6077697A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63228992A (en) * | 1987-03-17 | 1988-09-22 | Hitachi Ltd | Inverter controller |
| JPH0198010A (en) * | 1987-10-12 | 1989-04-17 | Aretsukusu Denshi Kogyo Kk | Automatic power factor controller |
| JPH0198009A (en) * | 1987-10-12 | 1989-04-17 | Aretsukusu Denshi Kogyo Kk | Automatic power factor controller |
| JPH01197819A (en) * | 1988-02-02 | 1989-08-09 | Aretsukusu Denshi Kogyo Kk | Automatic power controller for inductive load |
| JPH01206420A (en) * | 1988-02-15 | 1989-08-18 | Aretsukusu Denshi Kogyo Kk | Automatic power factor controller |
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