JPS59149788A - Controlling method for frequency converter - Google Patents
Controlling method for frequency converterInfo
- Publication number
- JPS59149788A JPS59149788A JP58020581A JP2058183A JPS59149788A JP S59149788 A JPS59149788 A JP S59149788A JP 58020581 A JP58020581 A JP 58020581A JP 2058183 A JP2058183 A JP 2058183A JP S59149788 A JPS59149788 A JP S59149788A
- Authority
- JP
- Japan
- Prior art keywords
- output
- frequency
- signal
- speed
- output signal
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
-
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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、交流電動機の速度制御に用いられる周波数変
換装置の制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of controlling a frequency conversion device used for controlling the speed of an AC motor.
近時直流電動機の速度制御方式を交流電動機の速度制御
に置換え保守の簡略化を図り、省エネルギーを目的にポ
ンプ・ゾロン・ファン等の２乗負荷特性の機種の可変速
化に交流化が多く採用されるようになった。Recently, the speed control method of DC motors has been replaced with the speed control of AC motors to simplify maintenance, and AC is often used to variable speed models with square load characteristics such as pumps, Zolon fans, etc. for the purpose of energy saving. It started to be done.
しかして、従来交流化の制御装置として周波数制御が連
続的に可能な周波数変換装置が用いられるが、かかる装
置は更に用途によって負荷電動機の回転数を検出してこ
の回転数を基準回転信号（速度基準）に一致するように
制御する開ループ制御方式と、速度基準に応じて負荷電
動機の一次周波数を制御し負荷電動機の回転数を負荷に
応じたすべりに追従させる開ループ制御方式とに区分さ
れる。Conventionally, a frequency converter capable of continuous frequency control has been used as an AC control device, but depending on the application, such a device also detects the rotation speed of the load motor and uses this rotation speed as a reference rotation signal (speed The open-loop control method controls the primary frequency of the load motor according to the speed reference, and the open-loop control method controls the rotation speed of the load motor to follow the slip according to the load. Ru.
、 このうち後者の開ループ制御方式では、負荷電動
機が速度基準信号に追従して速度変化するかどうかが問
題であシ、急加減速する時、特にこの点が問題である。In the latter open-loop control method, the problem is whether the load motor changes its speed in accordance with the speed reference signal, and this point is particularly problematic when there is sudden acceleration or deceleration.
即ち、一般的にがかる制御方式では、出力電圧と出力周
波数比（Ｖ／Ｆ比）を所定の関係に制御して負荷電動機
に定トルク特性を出させるが、電圧制御ループ内に電流
制限ループ（電流マイナー）を設けるため急加速制御時
に加速電流を制限するように出力電圧を抑制するとこの
間出力周波数のみが上昇して出力Ｖ／Ｆ比が所定値よシ
大幅にずれ所定の加速トルクかです負荷電動機の回転数
が速度基準値より大幅にずれることがある。また、後者
の負荷側に速度センサーを設けない開ループ制御方式で
は、センサーとして直流回転計発電機等を使用しないの
でこれの保守を省略できシステムおよび保守の簡略化が
達成できてこの点では交流化の本来の目的に最も適して
いる。In other words, in general, such a control method controls the output voltage and output frequency ratio (V/F ratio) to a predetermined relationship to cause the load motor to exhibit constant torque characteristics, but a current limiting loop ( If the output voltage is suppressed to limit the acceleration current during sudden acceleration control, only the output frequency will increase during this period, and the output V/F ratio will deviate significantly from the specified value, causing the specified acceleration torque to be reduced. The motor rotation speed may deviate significantly from the speed reference value. In addition, the latter open-loop control method that does not include a speed sensor on the load side does not use a DC tachometer generator, etc. as a sensor, so maintenance can be omitted, simplifying the system and maintenance. most suitable for its original purpose.
この開ループ制御方式の周波数変換装置の一例を第１図
に示す。この図で、１は速度基準、２はランプ関数ユニ
ット、３は発振器、４は周波数制御回路、５ＩＬはＦＶ
変換器、５ｂは出方電圧検出器、５ｅは電圧制御器、５
ｄは電流制御器、５ｅは位相制御回路、６は大刀交流電
源、７は整流器、８は直流リアクトル、９はイン・／９
−タ、１０は負荷電動機である。この第１図の動作を説
明すると、速度基準１の速度基準信号をランプ関数ユニ
ット２へ与え速度基準信号がランプ関数ユニット２によ
シ傾斜を持って出力電圧、周波数基準となり、発振器３
に入力され、一つは周波数基準信号となり、周波数制御
回路４を介し出力周波数制御を行なう。An example of a frequency conversion device using this open-loop control method is shown in FIG. In this figure, 1 is the speed reference, 2 is the ramp function unit, 3 is the oscillator, 4 is the frequency control circuit, and 5IL is the FV
Converter, 5b is an output voltage detector, 5e is a voltage controller, 5
d is a current controller, 5e is a phase control circuit, 6 is a large AC power supply, 7 is a rectifier, 8 is a DC reactor, 9 is an in/9
-ta, 10 is a load motor. To explain the operation shown in FIG. 1, a speed reference signal of speed reference 1 is applied to the ramp function unit 2, and the speed reference signal becomes the output voltage and frequency reference with a slope of the ramp function unit 2, and the oscillator 3
One of the signals is inputted as a frequency reference signal, and the output frequency is controlled via the frequency control circuit 4.
また発振器３の出力信号をアナログ信号に変換し出力電
圧基準を作るＦＶ変換器５ｍの出力と出力電圧検出器５
ｂの出力を電圧制御器５ｃで比較制御して、出力電流基
準を作シ、この出力電流基準信号と出力電流検出信号と
を電流制御器５ｄで比較制御して位相制御回路５ｅを介
して出力電圧制御を行なう。この時入力交流電源６の電
力を整流器７で順変換する過程で出力電圧を制御し、整
流器１で順変換した直流電力を直流リアクトル８で平滑
化し、この直流電力をインバータ９で逆変換する際に周
波数制御回路４の出力信号で制御して、負荷電動機１０
に与える交流電力を可変周波数制御する。これによυ負
荷電動機１０は加減制御される。In addition, the output of the FV converter 5m which converts the output signal of the oscillator 3 into an analog signal and creates an output voltage reference and the output voltage detector 5
A voltage controller 5c compares and controls the output of the output voltage controller 5c to create an output current reference, and a current controller 5d compares and controls the output current reference signal and the output current detection signal and outputs the output via a phase control circuit 5e. Performs voltage control. At this time, the output voltage is controlled in the process of forward converting the power of the input AC power source 6 with the rectifier 7, the DC power forward converted with the rectifier 1 is smoothed with the DC reactor 8, and when this DC power is reverse converted with the inverter 9. The load motor 10 is controlled by the output signal of the frequency control circuit 4.
The AC power applied to the system is controlled by variable frequency. As a result, the υ load motor 10 is controlled.
従来の周波数変換装置において、ランプ関数ユニット２
の一例を第２図に示し動作を説明する。１１〜１４は演
算増幅器、１５は絶対値変換回路、１６は電流フィード
バック信号、１７は基準下げ回路であ）、演算増幅器１
１のゲインを１とし、演算増幅器１１と１２の間に８１
を、演算増幅器１２〜１４に並列抵抗Ｒ３を接続してい
る。In the conventional frequency conversion device, the ramp function unit 2
An example of this is shown in FIG. 2 and its operation will be explained. 11 to 14 are operational amplifiers, 15 is an absolute value conversion circuit, 16 is a current feedback signal, and 17 is a reference lowering circuit), operational amplifier 1
The gain of 1 is 1, and 81 is connected between operational amplifiers 11 and 12.
A parallel resistor R3 is connected to the operational amplifiers 12 to 14.
この場合、速度基準１と演算増幅器１４の出力信号とは
最終的に所定関係になるよう増幅器１２〜１４によシ制
御される。このランプ関数ユニットにおいて、例えば加
速時に過電流とカシ、電流フィードバック信号１６が増
加した場合、基準下げ回路１７によシ増幅器１３に電圧
周波数基準を減少させる方向に信号が入力され、５−
第３図に示すように基準信号Ｖを急速に減少させ、電動
機速度Ｎと一致させ出力電圧と周波数が大幅にずれない
よう制御していた。In this case, the speed reference 1 and the output signal of the operational amplifier 14 are controlled by the amplifiers 12 to 14 so that they finally have a predetermined relationship. In this ramp function unit, when the overcurrent and current feedback signal 16 increase during acceleration, for example, a signal is inputted to the reference lowering circuit 17 to the amplifier 13 in the direction of decreasing the voltage frequency reference, and the 5-3 As shown in the figure, the reference signal V was rapidly decreased to match the motor speed N, and the output voltage and frequency were controlled so as not to deviate significantly.
しかしながら、かような制御方式の場合法のような欠点
がある。However, such control schemes have certain disadvantages.
（１） ポンプ、ブロワ、ファンなどの２乗トルク負
荷を駆動する。電動機速度の減少は速度が高いほど早く
、速度が低くなるほど遅くなる。(1) Drive square torque loads such as pumps, blowers, and fans. The motor speed decreases faster at higher speeds and slower at lower speeds.
このため基準を減少させる量を電動機速度が高い所で決
めると電動機速度が低い所で基準の減少する時間が早す
ぎ、電動機速度に対して速度基準が下がりすぎ回生領域
とがり、過電流となることがある。また基準を減少させ
る量を電動機速度の低い所で決めると、電動機速度が高
い所で基準の減少する時間が遅すぎて電動機速度と基準
がずれて行き過電流となることがある。For this reason, if the amount to reduce the reference is determined at a place where the motor speed is high, the time at which the reference is reduced is too fast at a place where the motor speed is low, and the speed reference falls too low relative to the motor speed, causing the regeneration region to become sharp and overcurrent to occur. There is. Furthermore, if the amount by which the reference is reduced is determined at a low motor speed, the time at which the reference is reduced is too slow at a high motor speed, resulting in a deviation between the motor speed and the reference, resulting in overcurrent.
（２）周波数制御は開ループ、電圧制御は閉ループにな
るため急加減速時のｖ液比が所定範囲を越え、負荷電動
機加減速時間の増加を生ずる。(2) Since frequency control is open loop and voltage control is closed loop, the v-liquid ratio during sudden acceleration/deceleration exceeds a predetermined range, causing an increase in the load motor acceleration/deceleration time.
６−
〔発明の目的〕
本発明は上記事情に鑑みてなされたもので、電動機速度
に対応した過電流保護ができ、しかも交流化に適した開
ループでも速度基準信号に負荷電動機が追従する安定な
速度制御が可能な周波数変換装置の制御方法を提供する
ことを目的とする。6- [Object of the invention] The present invention has been made in view of the above circumstances, and provides overcurrent protection corresponding to the motor speed, and also provides stability in which the load motor follows the speed reference signal even in an open loop suitable for alternating current. It is an object of the present invention to provide a control method for a frequency conversion device that allows speed control.
本発明は、この目的を達成するために、周波数変換装置
の出力電流が所定値まで増加した時、出力周波数を減少
させて交流電動機の回転数変化に出力周波数を追従させ
るために、電圧周波数基準信号を出力周波数に応じて制
御すると共に、低い出力周波数時にはゆるやかに変化さ
せるように制御することを特徴としたものである。In order to achieve this object, the present invention reduces the output frequency when the output current of the frequency converter increases to a predetermined value and makes the output frequency follow the change in the rotational speed of the AC motor. This is characterized by controlling the signal according to the output frequency, and controlling the signal so that it changes slowly when the output frequency is low.
以下本発明の一実施例を第４図に、電動機速度と速度基
準の関係を第５図に示す。即ち第４図は第２図ラン！関
数ユニットに代わるもので、図中１は速度基準信号を発
生する速度基準、１１〜１４は演算増幅器、１７は基準
下げ回路、２１は関数発生回路等により構成されており
、本ランプ関数ユニットは、速度基準信号を速度基準１
より入力し、増幅器１１〜１４により制御している。本
発明の詳細な説明すると、増幅器１１と増幅器１２の間
に抵抗器Ｒ１ｋ、また前記増幅器１２〜１４に抵抗器Ｒ
，を接続している。An embodiment of the present invention is shown in FIG. 4, and a relationship between motor speed and speed reference is shown in FIG. 5. In other words, Figure 4 is Figure 2 run! It replaces the function unit, and in the figure, 1 is a speed reference that generates a speed reference signal, 11 to 14 are operational amplifiers, 17 is a reference lowering circuit, and 21 is a function generation circuit. , the speed reference signal is set to speed reference 1
and is controlled by amplifiers 11 to 14. To explain the present invention in detail, a resistor R1k is provided between the amplifier 11 and the amplifier 12, and a resistor R1k is provided between the amplifiers 12 to 14.
, is connected.
この場合速度基準１の速度基準信号と増幅器１４の出力
信号とは最終的に所定関係になるよう増幅器１２〜１４
により制御され、また図示例では増幅器１２のｒインは
無限大でありその出力信号は、速度基準信号をＲ１にて
割った値の絶対値と増幅器１４の出力信号を抵抗器Ｒ，
で割った値の絶対値が等しくなるまで飽和電圧に向は振
れ、前記速度基準と増幅器１４の出力信号が等しくなっ
た時零になる。また電流フィード・々、り信号１６によ
り基準下げ回路１２を動作させ、その基準下げ回路１７
の出力信号と、増幅器１４の出力信号とを関数発生回路
２１により演算し増幅器１３の入力信号としている。こ
の関数発生回路２１の出力信号と、増幅器１２の出力信
号を合成し増幅器１４への入力信号を制御しているのが
増幅器１３である。増幅器１３からの出力信号により、
増幅器１４と並列に接続されたコンデンサＣを夫々電流
値によシ充電し増幅器１４の出力信号を制御している。In this case, the speed reference signal of speed reference 1 and the output signal of amplifier 14 are connected to
In the illustrated example, the r-in of the amplifier 12 is infinite, and its output signal is the absolute value of the speed reference signal divided by R1 and the output signal of the amplifier 14, which is controlled by the resistor R,
The direction of the saturation voltage oscillates until the absolute values of the divided values become equal, and become zero when the speed reference and the output signal of the amplifier 14 become equal. In addition, the reference lowering circuit 12 is operated by the current feed signal 16, and the reference lowering circuit 17 is operated by the current feed signal 16.
The output signal of the amplifier 14 and the output signal of the amplifier 14 are calculated by the function generating circuit 21 and are used as the input signal of the amplifier 13. The amplifier 13 combines the output signal of the function generating circuit 21 and the output signal of the amplifier 12 and controls the input signal to the amplifier 14. With the output signal from the amplifier 13,
The output signal of the amplifier 14 is controlled by charging each capacitor C connected in parallel with the amplifier 14 with a current value.
よって第４口金体を通して考えた場合、電流フィード・
々ツク信号１６によシ動作する基準下げ回路１７の出力
信号が「０」であれば、前記の速度基準信号を抵抗器Ｒ
１で割った値の絶対値と増幅器１４の出力信号を抵抗器
Ｒ３で割った値の絶対値は等しくなり、基準下げ回路１
７の出力信号が「１」であれば増幅器１２の出力信号を
抵抗器Ｒ３で割った値から関数発生回路２１の出力信号
を抵抗器Ｒ４で割った値の差によシ増幅器１４の出力信
号を減少させる。Therefore, when considering through the fourth cap, the current feed
If the output signal of the reference lowering circuit 17 operated by the speed reference signal 16 is "0", the speed reference signal is connected to the resistor R.
The absolute value of the value divided by 1 and the absolute value of the value obtained by dividing the output signal of the amplifier 14 by the resistor R3 are equal, and the reference lowering circuit 1
If the output signal of 7 is "1", the output signal of the amplifier 14 is determined by the difference between the value obtained by dividing the output signal of the amplifier 12 by the resistor R3 and the value obtained by dividing the output signal of the function generating circuit 21 by the resistor R4. decrease.
置の出力電流が過電流となった場合、出力電圧、周波数
基準を第５図のように変化させている。When the output current of the device becomes an overcurrent, the output voltage and frequency reference are changed as shown in FIG.
９−
即ち前記周波数変換装置の出力電流が過電流の時、基準
下げ回路１７は一定レベルの信号を出力するが、関数発
生回路２１より出力する信号レベルを変化させて、入力
制限回路２の出力信号（第５図の基準信号Ｖ）の変化率
、を低速領域でゆるやかにさせる。このため関数発生回
路２１では、基準下げ回路１７の出力信号と入力制限回
路２の出力信号との積を出力信号として抵抗器Ｒ４を介
して増幅器１３に入力する。9- That is, when the output current of the frequency converter is an overcurrent, the reference lowering circuit 17 outputs a signal at a constant level, but the output of the input limiting circuit 2 is changed by changing the signal level output from the function generating circuit 21. The rate of change of the signal (reference signal V in FIG. 5) is made gradual in the low speed region. Therefore, in the function generating circuit 21, the product of the output signal of the reference lowering circuit 17 and the output signal of the input limiting circuit 2 is input as an output signal to the amplifier 13 via the resistor R4.
以上説明したように本発明によれば、前記の電動機速度
と出力電圧、周波数基準の関係を所定範囲内に制御する
ことにより電動機速度の高い所では出力軍用、周波数基
準を早く減少させ、電動機速度の低い所では、出力電圧
、周波数基準を遅く減少させることとなる。前記第５図
の関係により第３図の関係のような電動機速度と出力電
圧・周波数基準の関係がある速度では所定範囲で制御さ
れ、またある速度では所定範囲をこえてしまうといった
ような不都合を生ずることなく、電動機の速度制御が可
能である。As explained above, according to the present invention, by controlling the relationship between the motor speed, output voltage, and frequency reference within a predetermined range, the output power is reduced quickly in areas where the motor speed is high, and the frequency reference is quickly reduced. At low values, the output voltage and frequency reference will decrease slowly. Due to the relationship shown in FIG. 5, the motor speed is controlled within a predetermined range at speeds where there is a relationship between the motor speed and the output voltage/frequency reference as shown in FIG. It is possible to control the speed of the electric motor without this occurring.
１０−
他の実施例として、入力制限回路２の変形例を第６図に
示す。この図において入力制限回路２の出力信号である
出力電圧・周波数基準よシミ動機速度を速度検出器３１
によシ検出し、スイッチ３２，３３．３４を前記出力電
圧・周波数基準レベルによりそれぞれ開閉動作を行ない
、電流フィードパ、り１６によシ出力過電流を検出した
場合、基準下げ回路１７を動作させ、基準下げ回路１７
の出力信号を前記スイッチ３２゜３３．３４により切換
えて増幅器１３の入力信号レベルを変えることによシ出
力電圧・周波数基準を電動機速度に近似させて下げるよ
う制御し、第７図に示すような関係を作ることも可能で
ある。10- As another embodiment, a modification of the input limiting circuit 2 is shown in FIG. In this figure, the speed detector 31 detects the motor speed based on the output voltage and frequency standard, which is the output signal of the input limiting circuit 2.
The switches 32, 33, and 34 are opened and closed according to the output voltage and frequency reference levels, respectively, and when the current feeder 16 detects an output overcurrent, the reference lowering circuit 17 is operated. , reference lowering circuit 17
By changing the input signal level of the amplifier 13 by switching the output signal of the amplifier 13 with the switch 32, 33, 34, the output voltage/frequency reference is controlled to be lowered to approximate the motor speed, and as shown in FIG. It is also possible to create relationships.
従ってかような構成によると出力電圧・周波数基準信号
を電流フィードバック信号と関連づけて制御し、出力過
電流が流れる期間を最少期間とすることによって、その
分制御の連応性を高めることができる。また加減速時間
は電流フィートノ４ツク信号に関連づけて制御できるの
で加減速中にも出力ｖ液比を所定値以内に制御できる。Therefore, according to such a configuration, the output voltage/frequency reference signal is controlled in association with the current feedback signal, and the period during which the output overcurrent flows is set to the minimum period, thereby making it possible to improve the coordination of the control accordingly. Further, since the acceleration/deceleration time can be controlled in relation to the current foot/four-clock signal, the output v-liquid ratio can be controlled within a predetermined value even during acceleration/deceleration.
更に出力トルクを最適に制御して加減速できるので、最
短時間での加減速が可能である。Furthermore, since the output torque can be controlled optimally to perform acceleration and deceleration, acceleration and deceleration can be performed in the shortest possible time.
つまり、本発明によれば速度基準信号の変化に対応して
連応性の高い制御ができ開ループでも速度基準信号に負
荷電動機が追従する安定々速度制御が可能である。尚本
発明は、上記実施例にのみ限定されず周波数変換装置に
おいて、出力電圧、周波数基準信号の変化を加減速時抑
制するように電流検出信号を加えて制御する方式であれ
ば良い。また定常運転中は電流検出信号が所定値以上と
なったとき出力周波数を減少させるよう制御する方式で
あれば良い。That is, according to the present invention, highly responsive control can be performed in response to changes in the speed reference signal, and stable speed control in which the load motor follows the speed reference signal even in an open loop is possible. It should be noted that the present invention is not limited to the above-mentioned embodiments, but may be any system in which the frequency converter is controlled by adding a current detection signal so as to suppress changes in the output voltage and frequency reference signal during acceleration and deceleration. Further, during steady operation, any control method may be used that controls the output frequency to be decreased when the current detection signal exceeds a predetermined value.
以上説明したように本発明によって、２乗トルク負荷を
駆動する負荷電動機が過電流を要求しても、周波数変換
装置の出力周波数もこの過電流期間に所定値に制限され
、開ループ制御でも安定な運転特性が得られる周波数変
換装置の制御方法を提供できる。As explained above, according to the present invention, even if the load motor that drives the square torque load requests overcurrent, the output frequency of the frequency converter is also limited to a predetermined value during this overcurrent period, making it stable even under open loop control. A method for controlling a frequency converter that provides excellent operating characteristics can be provided.
第１図は従来の周波数変換装置の要部のみを示す回路図
、第２図は同装置のランプ関数ユニ、トの一例の要部の
みを示す回路図、第３図は、同二二、トの出力信号と電
動機速度の関係を示す特性図、第４図、第６図は本発明
による周波数変換装置のそれぞれ異る一実施例の要部の
みを示す回路図、第５図、第７図は本発明による周波数
変換装置の一実施例の出力信号と電動機速度の関係を示
す特性図である。
１・・・速度基準、２・・・ランプ関数ユニット、３・
・・発振器、４・・・周波数制御回路、５・・・位相制
御回路、１１〜１４・・・増幅器、１５・・・絶対値変
換回路、１６・・・電流フィードパ、り信号、１７・・
・基準下げ回路、２１・・・関数−主回路１．３１・・
・速度検出器、３２，３３．３４−・・スイッチ。
出願人代理人 弁理士 鈴 江 武 彦第２ＥＪ
２
第３図 第５図
第４図
Ｆ−Ｆ％Ｍ ／”］
第６図Fig. 1 is a circuit diagram showing only the main parts of a conventional frequency conversion device, Fig. 2 is a circuit diagram showing only the main parts of an example of the ramp function unit of the same device, and Fig. 3 is a circuit diagram showing only the main parts of an example of the ramp function unit of the same device. FIGS. 4 and 6 are circuit diagrams showing only the essential parts of different embodiments of the frequency converter according to the present invention, and FIGS. The figure is a characteristic diagram showing the relationship between the output signal and motor speed of an embodiment of the frequency conversion device according to the present invention. 1... Speed reference, 2... Ramp function unit, 3...
... Oscillator, 4... Frequency control circuit, 5... Phase control circuit, 11-14... Amplifier, 15... Absolute value conversion circuit, 16... Current feeder, signal, 17...
・Reference lowering circuit, 21...Function-main circuit 1.31...
・Speed detector, 32, 33, 34-... switch. Applicant's agent Patent attorney Suzue Takehiko 2nd EJ 2 Figure 3 Figure 5 Figure 4 F-F%M /''] Figure 6
Claims (1)
振周波数で出力周波数制御することによシ交流電動機の
速度制御を行なう周波数変換装置において、前記周波数
変換装置の出力電流が所定値まで増加した時、前記出力
周波数を減少させて前記交流電動機の回転数変化に前記
出力周波数を追従させるようにした前記電圧周波数基準
信号を制御する際に、前記出力周波数の減少する勾配が
前記出力周波数の大きさで変化し低い出力周波数時にゆ
るやかになるように制御して、前記交流電動機の回転数
変化に前記出力周波数を追従制御して、出力過電流を抑
制するよう制御することを特徴とする周波数変換装置の
制御方法。In a frequency conversion device that controls the speed of an AC motor by oscillating at a frequency corresponding to a voltage frequency reference signal and controlling the output frequency at this oscillation frequency, when the output current of the frequency conversion device increases to a predetermined value, When controlling the voltage frequency reference signal in which the output frequency is decreased to make the output frequency follow changes in the rotational speed of the AC motor, the slope of the decrease in the output frequency is determined by the magnitude of the output frequency. The frequency conversion device is characterized in that the output frequency is controlled so that the output frequency becomes gentle when the output frequency changes and is low, and the output frequency is controlled to follow the change in the rotational speed of the AC motor to suppress output overcurrent. Control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58020581A JPS59149788A (en) | 1983-02-10 | 1983-02-10 | Controlling method for frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58020581A JPS59149788A (en) | 1983-02-10 | 1983-02-10 | Controlling method for frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59149788A true JPS59149788A (en) | 1984-08-27 |
Family
ID=12031177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58020581A Pending JPS59149788A (en) | 1983-02-10 | 1983-02-10 | Controlling method for frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59149788A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245642A (en) * | 2018-09-29 | 2019-01-18 | 深圳市英威腾电气股份有限公司 | High-voltage brushless double feedback electric engine control method, system, equipment and readable storage medium storing program for executing |
| CN110492827A (en) * | 2019-08-13 | 2019-11-22 | 南京钢铁股份有限公司 | A kind of control method for the frequency converter for not using current transformer to feed back |
-
1983
- 1983-02-10 JP JP58020581A patent/JPS59149788A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245642A (en) * | 2018-09-29 | 2019-01-18 | 深圳市英威腾电气股份有限公司 | High-voltage brushless double feedback electric engine control method, system, equipment and readable storage medium storing program for executing |
| CN109245642B (en) * | 2018-09-29 | 2020-06-30 | 深圳市英威腾电气股份有限公司 | Control method, system and equipment for high-voltage brushless dual-feeder and readable storage medium |
| CN110492827A (en) * | 2019-08-13 | 2019-11-22 | 南京钢铁股份有限公司 | A kind of control method for the frequency converter for not using current transformer to feed back |
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