JP2982436B2 - Inverter operation state switching method - Google Patents
Inverter operation state switching methodInfo
- Publication number
- JP2982436B2 JP2982436B2 JP3296085A JP29608591A JP2982436B2 JP 2982436 B2 JP2982436 B2 JP 2982436B2 JP 3296085 A JP3296085 A JP 3296085A JP 29608591 A JP29608591 A JP 29608591A JP 2982436 B2 JP2982436 B2 JP 2982436B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- inverter
- voltage
- state
- switching
- 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 - Lifetime
Links
Landscapes
- Stopping Of Electric Motors (AREA)
- Control Of Ac Motors In General (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、その負荷誘導電動機に
対する運転状態を交流出力による通常運転から直流出力
による制動運転へと切替える場合のインバータの運転状
態切替方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for switching the operation state of an inverter when the operation state of a load induction motor is switched from a normal operation using an AC output to a braking operation using a DC output.
【０００２】[0002]
【従来の技術】従来のこの種の運転状態切替方法として
は、インバータの出力電圧を図２或いは図３に示す動作
波形図の如く制御するものが知られている。先ず図２
は、その交流出力電圧Ｖi1にて通常の速度制御中の前記
インバ−タに対し時刻ｔo においてその負荷誘導電動機
に対する直流制動指令が発せられると、該インバータの
出力を直流出力に変更すると共にその出力値を所定値Ｖ
idとし直流制動状態に移行させる場合を示すものであ
る。次に図３は、前記の如き時刻ｔo において直ちに前
記インバ−タの交流出力を断つと共に所定時間後の時刻
ｔ3 において該インバ−タより前記所定値Ｖidの直流電
圧を出力させて直流制動状態に移行させる場合を示すも
のである。2. Description of the Related Art As a conventional operation state switching method of this type, a method of controlling the output voltage of an inverter as shown in an operation waveform diagram of FIG. 2 or 3 is known. First, FIG.
, The inverter of the normal speed control in at its AC output voltage V i1 - a DC braking command for the load induction motor at time to other t o is issued, as well as change the output of the inverter to the DC output The output value is set to a predetermined value V
This is a case where the state is shifted to the DC braking state as id . Next, FIG. 3, immediately the inverter in the such time t o of - direct current to output DC voltage of the predetermined value V id from data - the inverter at time t 3 after a predetermined time along with breaking the AC output of the motor This shows a case where the state is shifted to a braking state.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら前記の如
き従来の運転状態切替方法に関し、図２の場合には切替
直前における前記インバ−タの出力周波数が高ければ切
替瞬時に前記負荷誘導電動機の逆起電力による過大電流
が流入し該インバ−タは過電流状態となって運転停止に
至る危険性があった。また図３の場合の如く、前記の過
電流状態を回避するために前記負荷誘導電動機における
残留磁気の自然消滅待機期間（図示の場合は時刻ｔo 〜
ｔ3 間）において前記インバ−タの出力を断つものとす
れば、該出力断期間は切替直前における該インバ−タの
出力周波数が高くなる程長くなす必要があり、従って以
後の直流制動を含めた時刻ｔo からの所要停止時間も長
くなる。即ち該所要停止時間は前記の切替直前の出力周
波数に影響されて変動することになり、斯様な直流制動
制御が例えば位置決め制御用のものであればその停止位
置の精度を保つことは困難となる。However, with respect to the conventional operating state switching method as described above, in the case of FIG. 2, if the output frequency of the inverter immediately before the switching is high, the load induction motor is back-emergenced immediately after the switching. There is a danger that an excessive current due to electric power will flow in, and the inverter will be in an overcurrent state and stop operation. Also, as in the case of FIG. 3, in order to avoid the overcurrent state, a standby period for natural elimination of residual magnetism in the load induction motor (from time t o in the illustrated case).
Assuming curtailing output data, the output cross period the inverter in immediately before the switching - - In t between 3) the inverter must make long enough to data of the output frequency becomes higher, thus including subsequent DC braking required stop time from the time t o was even longer. That is, the required stop time varies depending on the output frequency immediately before the switching, and if such a DC braking control is for positioning control, for example, it is difficult to maintain the accuracy of the stop position. Become.
【０００４】上記に鑑み本発明は、前記の如き運転状態
切替直前の出力周波数の影響を小として直流制動への切
替えをより円滑なものとなし、且つその負荷誘導電動機
に対する所要停止時間の短縮を図り得るインバータの運
転状態切替方法の提供を目的とするものである。In view of the above, the present invention reduces the influence of the output frequency immediately before the switching of the operating state as described above to make the switching to the DC braking smoother and to reduce the required stop time for the load induction motor. It is an object of the present invention to provide a possible inverter operation state switching method.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明のインバータの運転状態切替方法は、その速
度制御対象である誘導電動機の運転状態を所定の交流出
力による通常運転から直流出力による制動運転へと切替
える場合のインバータの運転状態切替方法であって、切
替指令の印加と共に前記インバータの交流出力をその周
波数は不変の儘その電圧のみを所定の第一の時間勾配に
て低減制御し、該交流電圧が前記直流制動運転の定常状
態にて印加すべき直流電圧の定常所定値より小なる値と
して設定された切替設定値に達すれば、前記インバータ
の出力を直流出力に変更すると共にその直流出力電圧を
前記切替設定値から前記定常所定値まで所定の第二の時
間勾配にて増大制御し該所定値へ達すると共に定常的な
直流制動運転に移行させるものとする。In order to achieve the above object, a method for switching the operation state of an inverter according to the present invention is to change the operation state of an induction motor whose speed is to be controlled from a normal operation by a predetermined AC output to a DC output. A method for switching the operation state of an inverter in the case of switching to a braking operation according to (1), wherein the AC output of the inverter is controlled to reduce only the voltage thereof at a predetermined first time gradient while the frequency remains unchanged, together with the application of a switching command. When the AC voltage reaches a switching set value set as a value smaller than a steady state predetermined value of the DC voltage to be applied in the steady state of the DC braking operation, the output of the inverter is changed to a DC output, and The DC output voltage is controlled to increase from the switching set value to the steady-state predetermined value at a predetermined second time gradient, reaches the predetermined value, and shifts to a steady DC braking operation. It is assumed to be.
【０００６】[0006]
【作用】前記の如く負荷誘導電動機の運転状態切替瞬時
におけるインバ−タの過電流状態の発生は運転状態切替
瞬時における前記電動機の大なる逆起電力に起因し、該
逆起電力はまた運転状態変化に伴う該電動機中の磁束量
の変化を妨げるものとして発生するものである。従って
前記過電流状態の回避は、前記切替瞬時における前記電
動機中の磁束量の時間的変化率を小となすか或いは該磁
束量自体を小となしておくことにより可能となる。上記
に従い本発明は、前記の運転状態の切替時、前記インバ
−タの交流出力に関しその周波数は変更することなくそ
の電圧のみ所定の時間勾配にて低減させ且つその低減目
標値を直流制動時に前記電動機に印加すべき直流電圧の
所定値より小なる値となしてその低減を行い、該低減目
標値に達すれば続いて前記インバ−タの出力を直流出力
となすと共にその出力電圧を前記の如き直流電圧の所定
値まで新たな所定の時間的勾配にて増大させることによ
り、運転状態切替時点における該電動機中の磁束量自体
の縮小と，磁束変化量を小となすその時間的変化率の低
減とを図るものである。As described above, the occurrence of an overcurrent state of the inverter at the moment of switching the operation state of the load induction motor is caused by a large back electromotive force of the motor at the moment of switching the operation state. This is caused as a hindrance to a change in the amount of magnetic flux in the motor due to the change. Therefore, the overcurrent state can be avoided by reducing the temporal change rate of the magnetic flux amount in the electric motor at the instant of the switching or by reducing the magnetic flux amount itself. According to the present invention, according to the present invention, at the time of the switching of the operation state, the voltage of the inverter AC output is reduced at a predetermined time gradient without changing the frequency, and the reduction target value is reduced at the time of DC braking. The DC voltage to be applied to the motor is reduced to a value smaller than a predetermined value, and the DC voltage is reduced. When the reduction target value is reached, the output of the inverter is changed to a DC output and the output voltage is reduced as described above. By increasing the DC voltage to a predetermined value at a new predetermined time gradient, the amount of magnetic flux in the electric motor itself at the time of operating state switching is reduced, and the rate of change over time to reduce the amount of change in magnetic flux is reduced. It is intended to be.
【０００７】[0007]
【実施例】以下本発明の実施例を図１に示すインバータ
の出力電圧の動作波形図に従って説明する。即ち本発明
は前記インバータの出力電圧を該動作波形図に示す如く
制御するものである。なお図１は本発明の典型を示すも
のとし前記の請求項３記載内容に対応した出力電圧動作
波形図を示すものである。先ず図１は、その交流出力電
圧Ｖi1にて通常の速度制御中の前記インバ−タに対し時
刻ｔo においてその負荷誘導電動機に対する直流制動指
令が発せられると、該インバータの出力に関しその周波
数は変更することなくその電圧のみを所定の時間勾配に
て前記電圧Ｖi1より低減させ時刻ｔ1 においてその低減
目標値Ｖi2に達すれば、該時刻ｔ1 にて前記インバ−タ
の出力を交流より直流に変更すると共にその出力電圧を
前記直流制動における直流電圧の所定値Ｖidに向けて新
たな所定の時間的勾配にて増大制御し、時刻ｔ2 にて該
所定値Ｖidに達すれば該時刻ｔ2 以後定常的な直流制動
に移行させた場合を示すものである。この場合前記の電
圧Ｖi2は電圧Ｖidより小なる適当な値に選択されてい
る。なお図１は前記交流電圧の低減状態をその振幅の包
絡線により例示するものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the operation waveform diagram of the output voltage of the inverter shown in FIG. That is, the present invention controls the output voltage of the inverter as shown in the operation waveform diagram. FIG. 1 shows a typical waveform of the present invention, and shows an output voltage operation waveform diagram corresponding to the contents of claim 3. First, FIG. 1, the inverter of the normal speed control in at its AC output voltage V i1 - a DC braking command for the load induction motor is issued at time to data t o, the frequency relates to an output of the inverter Once you reach its reduction target value V i2 at time t 1 is reduced from the voltage V i1 that voltage only at a predetermined time gradient without changing the inverter at the time t 1 - from the AC output of the motor towards its output voltage to a predetermined value V id of the DC voltage at the DC braking with changing the direct current increases controlled by new predetermined temporal gradient, said it reaches the predetermined value V id at time t 2 time t 2 illustrates a case that has migrated in the subsequent steady DC braking. In this case, the voltage V i2 is selected to be an appropriate value smaller than the voltage V id . FIG. 1 illustrates the reduced state of the AC voltage by an envelope of the amplitude.
【０００８】[0008]
【発明の効果】本発明によれば、その速度制御対象であ
る誘導電動機の運転状態を所定の交流出力による通常運
転から直流出力による制動運転へと切替える場合のイン
バータの運転状態切替方法であって、切替指令の印加と
共に前記インバータの交流出力をその周波数は不変の儘
その電圧のみを所定の第一の時間勾配にて低減制御し、
該交流電圧が前記直流制動運転の定常状態にて印加すべ
き直流電圧の定常所定値より小なる値として設定された
切替設定値に達すれば、前記インバータの出力を直流出
力に変更すると共にその直流出力電圧を前記切替設定値
から前記定常所定値まで所定の第二の時間勾配にて増大
制御し該所定値へ達すると共に定常的な直流制動運転に
移行させることにより、前記交流出力による通常運転時
の周波数に関係無く過大電流の発生を抑制しながら前記
直流制動運転への円滑な切替えが可能となり且つ前記従
来の方法適用時に比し前記電動機の所要停止時間の短縮
を図ることができ、例えば位置決め制御に適用すればそ
の制御位置精度の向上と共に所要時間の短縮とによる制
御性能の向上が可能となる。According to the present invention, there is provided a method for switching the operation state of an inverter when the operation state of an induction motor whose speed is to be controlled is switched from a normal operation with a predetermined AC output to a braking operation with a DC output. With the application of the switching command, the AC output of the inverter is controlled to reduce only the voltage thereof at a predetermined first time gradient while keeping the frequency unchanged,
When the AC voltage reaches a switching set value set as a value smaller than a steady state predetermined value of the DC voltage to be applied in the steady state of the DC braking operation, the output of the inverter is changed to a DC output, and the DC output is changed. The output voltage is controlled to increase from the switching set value to the steady-state predetermined value at a predetermined second time gradient, and when the output voltage reaches the predetermined value and shifts to a steady DC braking operation, during normal operation with the AC output. It is possible to smoothly switch to the DC braking operation while suppressing the occurrence of an excessive current irrespective of the frequency of the motor, and it is possible to shorten the required stop time of the motor as compared with the case of applying the conventional method. If applied to control, control performance can be improved by improving the control position accuracy and shortening the required time.
【図１】本発明の実施例を示すインバータ出力電圧の動
作波形図FIG. 1 is an operation waveform diagram of an inverter output voltage showing an embodiment of the present invention.
【図２】従来技術の第一の実施例を示すインバータ出力
電圧の動作波形図FIG. 2 is an operation waveform diagram of an inverter output voltage showing a first embodiment of the prior art.
【図３】従来技術の第二の実施例を示すインバータ出力
電圧の動作波形図FIG. 3 is an operation waveform diagram of an inverter output voltage showing a second embodiment of the prior art.
Ｖi インバ−タ交流出力電圧 Ｖi1 通常速度制御中のインバ−タ交流出力電圧 Ｖi2 インバ−タ交流出力電圧の低減目標電圧 Ｖid 直流制動時の定常直流電圧 ｔ0 直流制動指令時刻 ｔ1 インバ−タ交流出力電圧の低減制御完了時刻 ｔ2 インバ−タ直流出力電圧の増大制御完了時刻 ｔ3 インバ−タ直流出力電圧の再出力時刻V i inverter - motor AC output voltage V i1 normal speed control in inverter - motor AC output voltage V i2 inverter - steady state DC voltage at reducing the target voltage V id DC braking of motor AC output voltage t 0 DC braking command time t 1 inverter - reduction control ending time t 2 inverters in motor AC output voltage - motor DC output voltage of increased control completion time t 3 inverter - re-output time of the data DC output voltage
Claims (1)
状態を所定の交流出力による通常運転から直流出力によ
る制動運転へと切替える場合のインバータの運転状態切
替方法であって、切替指令の印加と共に前記インバータ
の交流出力をその周波数は不変の儘その電圧のみを所定
の第一の時間勾配にて低減制御し、該交流電圧が前記直
流制動運転の定常状態にて印加すべき直流電圧の定常所
定値より小なる値として設定された切替設定値に達すれ
ば、前記インバータの出力を直流出力に変更すると共に
その直流出力電圧を前記切替設定値から前記定常所定値
まで所定の第二の時間勾配にて増大制御し該所定値へ達
すると共に定常的な直流制動運転に移行させることを特
徴とするインバータの運転状態切替方法。1. A method for switching the operation state of an inverter, in which the operation state of an induction motor to be speed-controlled is switched from a normal operation with a predetermined AC output to a braking operation with a DC output, the method comprising: The AC output of the inverter is controlled so that only its voltage is reduced at a predetermined first time gradient while its frequency remains unchanged, and the AC voltage is applied at a steady state of the DC voltage to be applied in the steady state of the DC braking operation. When the switching set value set as a value smaller than the value is reached, the output of the inverter is changed to a DC output, and the DC output voltage is changed to a predetermined second time gradient from the switching set value to the steady-state predetermined value. And switching to steady-state DC braking operation when the predetermined value is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3296085A JP2982436B2 (en) | 1991-11-13 | 1991-11-13 | Inverter operation state switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3296085A JP2982436B2 (en) | 1991-11-13 | 1991-11-13 | Inverter operation state switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05137364A JPH05137364A (en) | 1993-06-01 |
| JP2982436B2 true JP2982436B2 (en) | 1999-11-22 |
Family
ID=17828926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3296085A Expired - Lifetime JP2982436B2 (en) | 1991-11-13 | 1991-11-13 | Inverter operation state switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2982436B2 (en) |
-
1991
- 1991-11-13 JP JP3296085A patent/JP2982436B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05137364A (en) | 1993-06-01 |
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