JPS6194582A - Slip frequency control circuit - Google Patents
Slip frequency control circuitInfo
- Publication number
- JPS6194582A JPS6194582A JP59214207A JP21420784A JPS6194582A JP S6194582 A JPS6194582 A JP S6194582A JP 59214207 A JP59214207 A JP 59214207A JP 21420784 A JP21420784 A JP 21420784A JP S6194582 A JPS6194582 A JP S6194582A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- control circuit
- signal
- slip frequency
- circuit
- 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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/08—Controlling based on slip frequency, e.g. adding slip frequency and speed proportional frequency
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〕
本発明はインバータを駆動するすべり周波数制御回路に
関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a slip frequency control circuit for driving an inverter.
誘導電動機の可変速制御の代表的なもののひとつとして
すべり周波数制御がある。このすべり周波数制御は誘導
電動機の回転速度を検出してフィードバック制御を行な
うものであり、応答性に優れ、広い速度範囲と高いトル
ク特性をもち、運転精度が高いという特徴を持っている
。すべり周波数制御の一例を第３図に示すブロック図を
参照して説明する。図において１乃至８は主回路を形成
し、１は交流−直流変換器、２は平滑コンデンサ。Slip frequency control is one of the typical variable speed controls for induction motors. This slip frequency control detects the rotational speed of the induction motor and performs feedback control, and is characterized by excellent responsiveness, a wide speed range, high torque characteristics, and high operating accuracy. An example of slip frequency control will be explained with reference to the block diagram shown in FIG. In the figure, 1 to 8 form a main circuit, 1 is an AC-DC converter, and 2 is a smoothing capacitor.
３は直流−交流変換器である。４はこの主回路により駆
動される誘導電動機であり、この誘導電動機４の回転速
度は速度検出器５及び速度検出回路６により検出される
。速度検出回路６の出力信号Ｖ８Ｄは速度制御回路９に
入力される一方、加減速制限回路７を介して送られる速
度基準信号ＶＲＥＦとの比較演算がすべり周波数検出回
路８で行なわれ、これらの偏差信号を演算増幅してすべ
り周波数信号Δ■とする。このすべり周波数信号ΔＶと
、速度検出信号Ｖ８Ｄは速度制御回路９にて加算され、
周波数制御回路１０及び電圧制御回路１２への出力信号
となる。周波数制御回路１０では一次周波数指令信号の
大きさに比例した周波数を持つパルス信号を発生し、電
圧制御回路１１では速度制御回路８からの出力信号と検
流器１１からの信号により出力電圧信号を求め、それぞ
れ波形制御用マイクロプロセッサ１３に入力される。こ
の波形制御用マイクロプロセッサ１３では信号が入力さ
れると、波形制御信号の演算処理が行なわれ、波形制御
信号がベースドライブ回路１４を通じて直流−交流変換
器に出力される。１５は保護回路である。3 is a DC-AC converter. 4 is an induction motor driven by this main circuit, and the rotational speed of this induction motor 4 is detected by a speed detector 5 and a speed detection circuit 6. The output signal V8D of the speed detection circuit 6 is input to the speed control circuit 9, and the slip frequency detection circuit 8 compares it with the speed reference signal VREF sent via the acceleration/deceleration limiting circuit 7. The signal is operationally amplified to produce a slip frequency signal Δ■. This slip frequency signal ΔV and speed detection signal V8D are added in the speed control circuit 9,
This becomes an output signal to the frequency control circuit 10 and voltage control circuit 12. The frequency control circuit 10 generates a pulse signal with a frequency proportional to the magnitude of the primary frequency command signal, and the voltage control circuit 11 generates an output voltage signal using the output signal from the speed control circuit 8 and the signal from the galvanometer 11. and input them to the waveform control microprocessor 13. When a signal is input to this waveform control microprocessor 13, arithmetic processing is performed on the waveform control signal, and the waveform control signal is outputted to the DC-AC converter through the base drive circuit 14. 15 is a protection circuit.
上述のすべり周波数制御回路によれば速度検出信号Ｖ８
Ｄにすべり周波数信号Δ■を加算してこれを補正する様
にしているので追従応答性の向上な図ることができる。According to the above slip frequency control circuit, the speed detection signal V8
Since this is corrected by adding the slip frequency signal Δ■ to D, it is possible to improve the tracking response.
しかしながら高精度、高速応答性が要求される今日にお
いて、特に低速度領域におりるマイナス負荷時に、すべ
り周波数信号ΔＶが補正範囲を超えて低下し、出力設定
信号ｖＯが負電位から正電位に移行し、制御不能となる
という不具合が生じた。However, in today's world where high precision and high-speed response are required, the slip frequency signal ΔV drops beyond the correction range and the output setting signal vO shifts from a negative potential to a positive potential, especially during negative load in the low speed region. However, a problem occurred in which it became uncontrollable.
従来の速度制御回路を第４図に示して説明する。A conventional speed control circuit will be explained with reference to FIG.
図において６は速度検出回路、７は加減速制限回路であ
り、それぞれの出力信号である速度検出信号Ｖ３Ｄ （
正電位）、速度基準信号ＶＲＥＦ （負電位）は、それ
ぞれ抵抗２０．２１を介してすべり周波数検出回路８に
入力される。すべり周波数検出回路８は、オペアンプ２
３．抵抗２４．コンデンサ２５から構成され、速度検出
信号Ｖ８Ｄと速度基準信号ＶＲＥＦとの偏差を演算増幅
し、すべり周波数信号Δ■を出力する。このすべり周波
数信号Δ■は前記速度検出信号Ｖ８Ｄと共にそれぞれ抵
抗２６ 、２７を介して速度制御回路９は入力される。In the figure, 6 is a speed detection circuit, 7 is an acceleration/deceleration limiting circuit, and the speed detection signal V3D (
(positive potential) and speed reference signal VREF (negative potential) are input to the slip frequency detection circuit 8 via resistors 20 and 21, respectively. The slip frequency detection circuit 8 includes an operational amplifier 2
3. Resistance 24. It is composed of a capacitor 25, operationally amplifies the deviation between the speed detection signal V8D and the speed reference signal VREF, and outputs a slip frequency signal Δ■. This slip frequency signal Δ■ is input to the speed control circuit 9 together with the speed detection signal V8D via resistors 26 and 27, respectively.
この速度制御回路９はオペアンプ２８．抵抗２９から構
成され、すべり周波数信号ΔＶと速度検出信号Ｖ８Ｄと
の偏差を加算増幅し最終的な速度設定信号■０を出力す
る。This speed control circuit 9 has an operational amplifier 28. It is composed of a resistor 29, and adds and amplifies the deviation between the slip frequency signal ΔV and the speed detection signal V8D, and outputs the final speed setting signal 0.
上述の回路において不具合が生じる様子を第５図に示し
て説明する。同図において（ａ）は速度基準信号ＶＲＥ
Ｆ、 （ｂ）は負荷Ｌ 、 （Ｃ）は速度検出信号Ｖｓ
ｎ 。The manner in which a malfunction occurs in the above-mentioned circuit will be explained with reference to FIG. In the same figure, (a) is the speed reference signal VRE.
F, (b) is the load L, (C) is the speed detection signal Vs
n.
（ｄ） ｔｉすべり周波数信号ΔＶ、（ｅ）は速度設定
信号Ｖｏ。(d) ti slip frequency signal ΔV, (e) speed setting signal Vo.
（ｆ）は電動機の回転速度Ｎの変位を示している。今、
第５図（ａ）に示す様に速度基準信号ＶＲＥＦを一定と
した場合に、第５図（ｂ）に示す様に負荷りがマイナス
負荷になり、電動機の回転速度が速度基準を大巾に超え
たとすると、第５図（ｅ）に示す様に速度検出信号Ｖ８
Ｄが上昇するとともにすべり周波数信号ΔＶが正から負
へと急変する。従って第５図（ｄ）に示す様に速度設定
信号■０も上昇し、補正可能領域を超えて負から正の値
に反転するとこの回路は制御機能を失い、電動機は負荷
により回転させられる制御不能状態になる。特に、電動
機が低速度で駆動される場合には速度基準信号ＶＲＥＦ
の値が小さしまためこの様な不具合が生じやすい。(f) shows the displacement of the rotational speed N of the electric motor. now,
When the speed reference signal VREF is kept constant as shown in Fig. 5(a), the load becomes a negative load as shown in Fig. 5(b), and the rotational speed of the motor becomes much larger than the speed reference. If it exceeds the speed detection signal V8 as shown in FIG. 5(e),
As D increases, the slip frequency signal ΔV suddenly changes from positive to negative. Therefore, as shown in Figure 5(d), when the speed setting signal ■0 also rises and goes beyond the correctable range and reverses from a negative value to a positive value, this circuit loses its control function and the motor is controlled to be rotated by the load. become incapacitated. In particular, when the electric motor is driven at low speed, the speed reference signal VREF
When the value of is small, such problems are likely to occur.
本発明は、低速度領域にお（プるマイナス負荷に対して
も良好な制動特性が得られるすべり周波数制御回路を提
供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a slip frequency control circuit that can obtain good braking characteristics even under negative loads in the low speed region.
本発明は電動機の速度を速度検出手段により検出し、こ
の速度検出信号と速度基準信号との偏差よりすべり周波
数を求め、このすべり周波数と前記速度検出信号とを速
度制御回路にて演算増幅して速度設定信号を得る様にし
た電動機のすべり周波数制御回路において、前記速度制
御回路に帰還回路な設りたことにより、速度制御回路の
出力電圧を所定値以下に抑えて、電動機が低速度領域の
マイナス負荷に対して制御不能となることを防止したす
べり周波数制御回路にある。In the present invention, the speed of the electric motor is detected by a speed detection means, a slip frequency is determined from the deviation between this speed detection signal and a speed reference signal, and this slip frequency and the speed detection signal are operationally amplified by a speed control circuit. In a slip frequency control circuit for a motor configured to obtain a speed setting signal, by providing a feedback circuit in the speed control circuit, the output voltage of the speed control circuit is suppressed to a predetermined value or less, and the motor is controlled in a low speed region. The slip frequency control circuit prevents loss of control in response to negative loads.
以下本発明を第１図に示す一実施例を参照して説明する
。The present invention will be explained below with reference to an embodiment shown in FIG.
図において第４図と同一番号は同一あるいは相当部分を
示し、３０は帰還回路、８５は速度制御回路の入出力間
に出力側から入力側に導通性を有する様に接続されたダ
イオードである。帰還回路３０は、速度制御回路９の出
力側と正電位との間に接続された可変抵抗３１．この可
変抵抗３１から抵抗３２を介してベース接続されたトラ
ンジスタ３３．及びこのトランジスタ３３のコレクタと
正電位との間に接続された抵抗８４とから構成されトラ
ンジスタ３３のエミッタは速度制御回路９の入力側に接
続されている。この様に接続された帰還回路８０におい
ては、速度制御回路９の出力が可変抵抗３１に設定され
た所定値までに達するとトランジスタ８３のベースに正
電位がかかり、ベース電流によりトランジスタ３３がＯ
Ｎｔ、正電位側から抵抗３４を介して速度制御回路９の
入力側に電流が流れ、入力側の電圧が上昇する。才だダ
イオード３５は速度制御回路９の出力電圧が正の値にな
ったときにこれを＋ＯＶに抑える為のものである。In the figure, the same numbers as in FIG. 4 indicate the same or corresponding parts, 30 is a feedback circuit, and 85 is a diode connected between the input and output of the speed control circuit so as to have conductivity from the output side to the input side. The feedback circuit 30 includes a variable resistor 31 . connected between the output side of the speed control circuit 9 and a positive potential. A transistor 33 whose base is connected to this variable resistor 31 via a resistor 32. and a resistor 84 connected between the collector of this transistor 33 and a positive potential.The emitter of the transistor 33 is connected to the input side of the speed control circuit 9. In the feedback circuit 80 connected in this way, when the output of the speed control circuit 9 reaches a predetermined value set in the variable resistor 31, a positive potential is applied to the base of the transistor 83, and the base current causes the transistor 33 to turn off.
Nt, a current flows from the positive potential side to the input side of the speed control circuit 9 via the resistor 34, and the voltage on the input side rises. The diode 35 is used to suppress the output voltage of the speed control circuit 9 to +OV when it becomes a positive value.
次に上記構成の本発明の一実施例にお（プる作用を第２
図を用いて説明する。第２図（ａ）乃至（ｆ）は第１図
に示した回路にお（プる信号波形を第５図と同様に示し
たものである。従来例と同様に電動機の速度基準が一定
の状態で負荷が急にマイナス負荷になると電＃＋機は負
荷により回転させられることになり、電動機速度は速度
基準を超え、速度検出信号Ｖｓｎが増加し、すべり周波
数信号Δ■は正から負の値に急変する。速度制御回路９
の出力信号である速度設定信号Ｖｏは、このすべり周波
数信号ΔＶと速度検出信号Ｖ８Ｄの加算増幅出力である
から、すべり周波数信号△Ｖが補正可能範囲を超えると
、負電位から正電位に移行し、速度制御機能を失なおう
とする。そこで第２図（ｅ）に示す様に速度設定信号Ｖ
ｏが負電位から零電位になる直前にトランジスタ３３の
ベースに正電圧がかかる様に可変抵抗３１を設定してお
き、帰還回路を動作させることにより速度設定信号Ｖｏ
を負電位に保ち、速度制御機能を維持する。そして、そ
の後マイナス負荷が解除されると電動機に円滑に制動を
かζプ設定速度まで追従させる。Next, in one embodiment of the present invention having the above configuration (the pulling action is
This will be explained using figures. Figures 2(a) to (f) show the signal waveforms applied to the circuit shown in Figure 1 in the same way as Figure 5.As with the conventional example, the speed reference of the motor is constant. If the load suddenly becomes a negative load in this state, the motor will be rotated by the load, the motor speed will exceed the speed standard, the speed detection signal Vsn will increase, and the slip frequency signal Δ will change from positive to negative. value suddenly changes.Speed control circuit 9
The speed setting signal Vo, which is the output signal, is the summation and amplification output of the slip frequency signal ΔV and the speed detection signal V8D, so when the slip frequency signal ΔV exceeds the correctable range, it shifts from a negative potential to a positive potential. , attempts to lose speed control function. Therefore, as shown in Fig. 2(e), the speed setting signal V
The variable resistor 31 is set so that a positive voltage is applied to the base of the transistor 33 immediately before o changes from negative potential to zero potential, and by operating the feedback circuit, the speed setting signal Vo
is held at a negative potential to maintain speed control function. After that, when the negative load is released, the motor is smoothly braked to follow the set speed.
上述の通り本発明の一実施例によれば、低速領域にお（
ブるマイナス負荷に対しても、速度制御機能を失なうこ
となく電動機に制動をかζ）ることが可能である。As mentioned above, according to an embodiment of the present invention, the (
It is possible to brake the motor without losing the speed control function even in the case of a negative load.
尚、上述した本発明の一実施例においては帰還回路にト
ランジスタを用いているが、これを他のスイッチング素
子にて代用することも当然可能である。Note that although a transistor is used in the feedback circuit in the above-described embodiment of the present invention, it is of course possible to use other switching elements instead.
以上述べた通り本発明によれば、速度制御回路に帰還回
路を設ζＪることにより低速度領域のマイ・ナス負荷に
対しても速度制御機能を失なうことなく、制動特性を向
上させることが可能となった。As described above, according to the present invention, by providing a feedback circuit in the speed control circuit, braking characteristics can be improved without losing the speed control function even under negative loads in the low speed range. became possible.
第１図は、本発明の一実施例を示す主要部の回路図、第
２図は第１図に示した回路の各部波形図。
＠３図は従来のすべり周波数制御回路のブロック図、第
４図は従来例の主要部を示す回路図、第５図は第４図に
示した回路の各部波形図である。
１・・・交流−直流変換器、２・・・平滑コンデンサ。
３・−・直流−交流変換器、４・・−誘導電動機。
５・・・速度検出器、 ６・・・速度検出回路。
７・・・加減速制限回路。
９・・−速度制御回路、１ｏ・・・周波数制御回路。
１３・・・マイクロプロセッサ。
１４・・・ベース・ドライブ回路。
２０；２１．２４．２６．２７．２９．８１．８８・・
・抵抗。
２８、２８−・・オペアンプ、２５・・・コンデンサ。
３０・・・可変抵抗、３２・・・トランジスタ。
３４・・・ダイオード。FIG. 1 is a circuit diagram of main parts showing an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part of the circuit shown in FIG. 1. 3 is a block diagram of a conventional slip frequency control circuit, FIG. 4 is a circuit diagram showing the main parts of the conventional example, and FIG. 5 is a waveform diagram of each part of the circuit shown in FIG. 4. 1...AC-DC converter, 2...Smoothing capacitor. 3.--DC-AC converter, 4.--Induction motor. 5...Speed detector, 6...Speed detection circuit. 7... Acceleration/deceleration limiting circuit. 9...-speed control circuit, 1o... frequency control circuit. 13...Microprocessor. 14...Base drive circuit. 20; 21.24.26.27.29.81.88...
·resistance. 28, 28-... operational amplifier, 25... capacitor. 30...Variable resistor, 32...Transistor. 34...Diode.
Claims (2)
速度検出手段からの速度検出信号と前記電動機の速度基
準信号との偏差からすべり周波数を求め、このすべり周
波数信号と前記速度検出信号とを速度制御回路にて演算
増幅して速度設定信号を得る電動機のすべり周波数制御
回路において、前記速度制御回路に出力電圧を所定値以
下に抑える帰還回路を設けたことを特徴とするすべり周
波数制御回路。(1) The speed of the electric motor is detected by a speed detection means, the slip frequency is determined from the deviation between the speed detection signal from the speed detection means and the speed reference signal of the motor, and this slip frequency signal and the speed detection signal are A slip frequency control circuit for a motor that obtains a speed setting signal through operational amplification in a speed control circuit, characterized in that the speed control circuit is provided with a feedback circuit that suppresses an output voltage to a predetermined value or less.
との間に設けた可変抵抗と、この可変抵抗に抵抗を介し
てベース接続され前記速度制御回路の入力側にエミッタ
、正電位側に抵抗を介してコレクタを接続したトランジ
スタとを具備し、前記可変抵抗により設定する所定値は
前記速度制御回路の出力電圧が零電位近傍の負電位で前
記トランジスタに正電位を与える様に設定することを特
徴とする特許請求の範囲第１項記載のすべり周波数制御
回路。(2) The feedback circuit includes a variable resistor provided between the output side of the speed control circuit and a positive potential, a base connected to the variable resistor via a resistor, an emitter connected to the input side of the speed control circuit, and a positive potential. and a transistor whose collector is connected to the side through a resistor, and the predetermined value set by the variable resistor is set so that the output voltage of the speed control circuit is a negative potential near zero potential and a positive potential is given to the transistor. A slip frequency control circuit according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59214207A JPS6194582A (en) | 1984-10-15 | 1984-10-15 | Slip frequency control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59214207A JPS6194582A (en) | 1984-10-15 | 1984-10-15 | Slip frequency control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6194582A true JPS6194582A (en) | 1986-05-13 |
Family
ID=16652003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59214207A Pending JPS6194582A (en) | 1984-10-15 | 1984-10-15 | Slip frequency control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6194582A (en) |
-
1984
- 1984-10-15 JP JP59214207A patent/JPS6194582A/en active Pending
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