JPS62210890A - Picking-out method for motor - Google Patents
Picking-out method for motorInfo
- Publication number
- JPS62210890A JPS62210890A JP61049848A JP4984886A JPS62210890A JP S62210890 A JPS62210890 A JP S62210890A JP 61049848 A JP61049848 A JP 61049848A JP 4984886 A JP4984886 A JP 4984886A JP S62210890 A JPS62210890 A JP S62210890A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output
- frequency
- inverter
- excitation
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000005284 excitation Effects 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 101100084595 Caenorhabditis elegans pam-1 gene Proteins 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ、産業上の利用分野
この発明は順、逆変換装置を用いた電動機の拾い上げ方
法に関する。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a method for picking up an electric motor using a forward and inverse converter.
Ｂ４発明の概要
との発明はＰＡＭ制御される順変換装置とＰＷＭ制され
る逆変換装置を用いた電動機の拾い上げ方法において、
電動機の残留電圧がないときに、一定時間間隔で予備励
磁電圧を数回与え残留電圧が励磁電圧のＩＡ以上発生し
ない間に励磁下限周波数に達したなら、逆変換装置の出
力電圧を上昇させ、逆変換装置の出力電圧を上昇させる
過程で出力電流が１００％を越えたとき逆変換装置の出
力周波数を低下させて出力電流が１００％以内になった
後に拾い上げを行うようにした仁とにより、
残留電圧が無くても確実かつ円滑な拾い上げ処理を可能
としたものである。B4 Summary of the Invention The invention provides a method for picking up a motor using a PAM-controlled forward conversion device and a PWM-controlled inverse conversion device, in which a pre-excitation voltage is applied several times at regular time intervals when there is no residual voltage in the motor. If the excitation lower limit frequency is reached before the residual voltage exceeds IA of the excitation voltage, the output voltage of the inverter is increased, and in the process of increasing the output voltage of the inverter, the output current exceeds 100%. By lowering the output frequency of the inverter and performing pickup after the output current is within 100%, it is possible to perform the pickup process reliably and smoothly even when there is no residual voltage. be.
Ｃ０従来の技術
近年、誘導電動機や同期電動機等の電動機の可変速運転
はインバータ（逆変換装置）を用いて行なわれるように
なって来た。このインバータにより電動機の可変速運転
を行っているとき、瞬時停電等により、インバータと電
動機間が電気的に切り離され、復電後にインバータと電
動機とを再接続して可変速制御することを拾い上けと称
している。BACKGROUND OF THE INVENTION In recent years, variable speed operation of electric motors such as induction motors and synchronous motors has come to be performed using inverters (inverse conversion devices). When variable speed operation of the electric motor is performed using this inverter, the inverter and electric motor are electrically disconnected due to a momentary power outage, etc., and after power is restored, the inverter and electric motor are reconnected to perform variable speed control. It is called ke.
Ｄ１発明が解決しようとする問題点
インバータと電動機とを再接続するには通常同期投入と
いう手段を用いて行われる。同期投入を行う際、電動機
に残留電圧がない場合には電動機の回転数を検出１、位
相合せを行う。この位相合せに通常ＰＬＬ回路が使用さ
れる。ＰＬＬ回路を使用すると回路構成が複雑となる問
題があるＣまた、拾い上げの時にデジタル系からアナロ
グ系に切換えると切換時の制御が円滑にできないで過渡
電圧が発生し、回転ムラが生じやすくなる問題がある。D1 Problems to be Solved by the Invention Normally, a method called synchronization is used to reconnect the inverter and the electric motor. When performing synchronization, if there is no residual voltage in the motor, the rotational speed of the motor is detected 1 and phase matching is performed. A PLL circuit is usually used for this phase adjustment. When using a PLL circuit, there is a problem that the circuit configuration becomes complicatedC.Also, when switching from a digital system to an analog system at the time of pickup, control at the time of switching cannot be smoothly performed, causing transient voltage to occur, which tends to cause uneven rotation. There is.
Ｅ０問題点を解決するための手段
この発明は逆変換装置の出力電圧が喪失された後、電動
機の残留電圧の有無を検出する工程と、残留電圧が無し
と検出された後、ＰＷＭ発生回路に与える周波数データ
を商用電源周波数にセットするとともに電圧データをＰ
ＷＭ位相制御角演算部から与えて一定時間の間道変換装
置を駆動させて最初の予備励磁電圧を送出する工程と、
この予備励磁電圧により電動機の残留電圧が励磁電圧の
１／２以上発生するかどうかを判別する工程と、この判
別工程で励磁電圧の１／２以上でないと判別されたなら
逆変換装置を再び動作させ、その出力周波数を段階的に
下げ、周波数を下げるたび毎に予備励磁電圧を送出する
工程と、この工程を励磁下限局波数まで行っても残留電
圧が励磁電圧の１／２以上発生しないならその下限周波
数をホールドする工程と、この工程でホールドされた下
限周波数をＰＷＭ発生回路の周波数データとして与える
とともにＰＷＭ位相制御角演算部の電圧データを徐々に
ＰＷＭ発生回路に与えて、逆変換装置の出力電圧を上昇
させる工程と、この工程によシ逆変換装置の出力電圧を
上昇させる過程で出力電流が定格値を越えたときに逆変
換装置の出力周波数を低下させるとともに出力電圧をホ
ールドさせて出力電流が定格値以内に入るようにさせる
工程と、電流が定格値以内に入った後、出力周波数の低
下を停止させてホールドし徐々に逆変換装置の出力電圧
を上昇させる工程と、この工程の処理のとき、周波数設
定器の設定値と逆変換装置の出力周波数に差があったと
きには周波数加減指令を与え、その後、前記差がなくな
ったなら、ＰＷＭ発生回路をアナログ系出力で処理させ
る工程とを備えたものである。Means for Solving the E0 Problem The present invention includes a process of detecting the presence or absence of residual voltage in the motor after the output voltage of the inverter is lost, and a process of detecting the presence or absence of residual voltage in the motor after the output voltage of the inverter is lost, and a process of detecting the presence or absence of residual voltage in the PWM generation circuit after the output voltage of the inverter is Set the frequency data to be given to the commercial power supply frequency and set the voltage data to P.
A step of sending out the first pre-excitation voltage by applying it from the WM phase control angle calculation unit to drive the road conversion device for a certain period of time;
A step of determining whether the residual voltage of the motor is generated by this pre-excitation voltage is 1/2 or more of the excitation voltage, and if it is determined in this determination step that it is not 1/2 or more of the excitation voltage, the inverter is operated again. The output frequency is lowered step by step, and the pre-excitation voltage is sent every time the frequency is lowered. A step of holding the lower limit frequency, and giving the lower limit frequency held in this step as frequency data to the PWM generation circuit, and gradually giving the voltage data of the PWM phase control angle calculation section to the PWM generation circuit, There is a process of increasing the output voltage, and when the output current exceeds the rated value during the process of increasing the output voltage of the inverter, the output frequency of the inverter is lowered and the output voltage is held. A process of making the output current fall within the rated value, a process of stopping and holding the decrease in the output frequency after the current falls within the rated value, and gradually increasing the output voltage of the inverter, and this process. During the process, if there is a difference between the set value of the frequency setter and the output frequency of the inverse converter, a frequency adjustment command is given, and after that, when the difference disappears, the PWM generation circuit is made to process with analog system output. It is equipped with the following.
７０作用
逆変換装置の動作停止後、拾い上げ指令が入力されると
、残留電圧の有無を検出する。残留電圧が無いと検出さ
れたなら、ＰＷＭ発生回路の周波数データに適用ｗ１源
周波数を与えて逆変換装置を最大出力周波数とするとと
もにＰＷＭ位相制御角（以下ＰＷＭαと称す）演算部の
出力を徐々に上昇させて、電動機に最初の励磁電圧を印
加する。When a pick-up command is input after the operation of the 70-action inverter is stopped, the presence or absence of residual voltage is detected. If it is detected that there is no residual voltage, the applied w1 source frequency is given to the frequency data of the PWM generation circuit to set the inverse converter to the maximum output frequency, and the output of the PWM phase control angle (hereinafter referred to as PWMα) calculation section is gradually increased. Apply the first excitation voltage to the motor.
この電圧は定格電圧の１０〜２０％位とする。励磁電圧
は数回繰返し、電動機に印加させるが電動機の残留電圧
が励磁電圧の１／２以上とならないときに、励磁下限周
波数に達したなら、その周波数をホールドする。なお、
励磁電圧を複数回印加させるたびに逆変換装置の出力周
波数を段階的に順次低下させる。前記ホールド尤た周波
数をＰＷＭ発生回路の周波数データとし、ＰＷＭα演算
部の電圧データを徐々に上昇させる。この上昇途中で、
出力電流が定格値を越えたならば出力周波数を低下させ
、前記出力雷１流が定格値以内にｋつたならそのときの
周波数データをホールドする。その彼、出力電圧を再度
上昇させ、電圧／周波数ホールド値（ｖ／ｆｕ ）
に相当する電圧まで上昇させて電動機の拾い上げを完了
する。This voltage is approximately 10 to 20% of the rated voltage. The excitation voltage is repeatedly applied to the motor several times, but if the excitation lower limit frequency is reached when the residual voltage of the motor does not become 1/2 or more of the excitation voltage, that frequency is held. In addition,
Each time the excitation voltage is applied a plurality of times, the output frequency of the inverter is sequentially lowered step by step. The held frequency is used as the frequency data of the PWM generation circuit, and the voltage data of the PWMα calculation section is gradually increased. During this rise,
If the output current exceeds the rated value, the output frequency is lowered, and if the output lightning current falls within the rated value, the frequency data at that time is held. Then he increases the output voltage again and sets the voltage/frequency hold value (v/fu)
The motor pick-up is completed by increasing the voltage to the voltage equivalent to .
Ｇ、実施例 以下図面の参照してこの発明の一実施例を説明する。G. Example An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１は周波数設定器で、この設定器１の
出力は第１つき合せ部２を介して加算増幅回路３に供給
される。加算増幅回路３の出力はクッション回路４に供
給される。このクッション回路４は電動機の始動が円滑
にできるような特性に形成されている。クッション回路
４の出力は第２つき合せ部５を介して周波数増幅回路６
に供給される。この増幅回路６の出力は電流増幅回路７
を介して反転増幅回路８へ供給される。反転増幅回路８
の出力は第２つき合せ部５にフィードバックされるとと
もに電圧設定増幅回路９と周波数設定増幅回路１０に入
力される。電圧設定増幅回路９の出力は電圧設定パター
ン回路１１を介して第３つき合せ部１２のプラス端に供
給される。この第３つき合せ部１２のマイナス端には直
流電圧Ｖａがフイ−ドパツクされ、その偏差出力がＰＡ
Ｍ電圧増幅回路１３に入力される。このＰ Ａ Ｍ １
ｈ３：圧増幅回路１３の出力は位相器１４とゲート回路
１５を介してサイリスタからなるコンバータ順変換装＠
１６に供給される。このコンバータ１６はＰＡＭ制御さ
れるｃ１７は直流リアクトル、１８は電解コンデンサ、
１９は直流電圧Ｖａを検出する直流電圧検出部、２０は
直流電流Ｔ（ｌ検出部である。In FIG. 1, reference numeral 1 denotes a frequency setter, and the output of this setter 1 is supplied to a summing amplifier circuit 3 via a first matching section 2. The output of the summing amplifier circuit 3 is supplied to a cushion circuit 4. This cushion circuit 4 is formed to have such a characteristic that the electric motor can be started smoothly. The output of the cushion circuit 4 is sent to the frequency amplification circuit 6 via the second matching section 5.
supplied to The output of this amplifier circuit 6 is the current amplifier circuit 7
The signal is supplied to the inverting amplifier circuit 8 via the inverting amplifier circuit 8. Inverting amplifier circuit 8
The output is fed back to the second matching section 5 and input to the voltage setting amplifier circuit 9 and the frequency setting amplifier circuit 10. The output of the voltage setting amplifier circuit 9 is supplied to the positive end of the third matching section 12 via the voltage setting pattern circuit 11. A DC voltage Va is fed to the negative end of the third matching portion 12, and its deviation output is PA.
It is input to the M voltage amplification circuit 13. This PAM 1
h3: The output of the pressure amplifier circuit 13 is sent to a converter converter consisting of a thyristor via a phase shifter 14 and a gate circuit 15.
16. This converter 16 is controlled by PAM, c17 is a DC reactor, 18 is an electrolytic capacitor,
19 is a DC voltage detection unit that detects DC voltage Va, and 20 is a DC current T(l detection unit).
２１はトランジスタからなるインバータ（逆変換装置）
で、このインバータ２１はコンバータ１６から与えられ
る直流電圧を交流電圧に変換して出カドランス２２に供
給される。出カドランス２２は供給された電圧を所定の
電圧に変換した後、開閉器２３を介して電動機２４に供
給する。21 is an inverter (inverse conversion device) consisting of a transistor
The inverter 21 converts the DC voltage provided from the converter 16 into an AC voltage and supplies the AC voltage to the output transformer 22 . The output transformer 22 converts the supplied voltage into a predetermined voltage, and then supplies the voltage to the electric motor 24 via the switch 23 .
２５はインバータ２１から出力電圧ＶＭを得るトランス
、２６はインバータ２１の出力電流ＴＭを検出する変流
器である。２７は電動機（ＩＭ）２４の出力（残留）ｉ
１１圧ＶＨを検出するトランス、２８．２９は開閉器で
、開閉器２８は電動機２４をインバータで動作させるた
めのもの、開閉器２９は電動機２４を商用電源で動作さ
せるためのものである。３０はトランスである。25 is a transformer that obtains the output voltage VM from the inverter 21, and 26 is a current transformer that detects the output current TM of the inverter 21. 27 is the output (residual) i of the electric motor (IM) 24
A transformer for detecting the 11-voltage VH, 28 and 29 are switches, the switch 28 is for operating the electric motor 24 with an inverter, and the switch 29 is for operating the electric motor 24 with commercial power. 30 is a transformer.
３１はトランス２７で検出された出力（残留）電圧ＶＨ
が供給されるゼロクロスコンパレータで、このコンパレ
ータ３１で検出された出力（残留）電圧ＶＨはマイクロ
コンピュータ等から形成される演算処理部３２の周波数
計測部３２ ａに供給され、ここで電動機２４０周波数
が計測される。計測周波数は周波数演算部３２ｂに入力
されて演算され、その演嘗データがＦｓ （周波数デー
タ）としてＰＷＡ発生回路３２ ｃに与えられる。出力
（残留）電圧ＶＨがないときには演算部３２ ｂで設定
されたデータがＰＷＭ発生回路３２ ｏに供給される。31 is the output (residual) voltage VH detected by the transformer 27
The output (residual) voltage VH detected by this comparator 31 is supplied to the frequency measurement unit 32a of the arithmetic processing unit 32 formed from a microcomputer, etc., where the frequency of the motor 240 is measured. be done. The measured frequency is input to the frequency calculation section 32b and calculated, and the performance data is given to the PWA generation circuit 32c as Fs (frequency data). When there is no output (residual) voltage VH, the data set by the calculation section 32b is supplied to the PWM generation circuit 32o.
３３は周波数データ切換スイッチで、拾い上げ時は図示
のように可動片がｂ側に接続されていて、拾い上げが終
るとａ側に切換えられる。３２ａは周波数設定増幅回路
１０の出力、直流電圧Ｖａ及び出力（残留）電圧ＶＨが
入力されて出力に位相制御角αを得るＰＷＭα演算部で
、このα演算部３２ （１の出力はＰＷＭ発生回路３２
ｃに電圧データＶａとして供給される。Reference numeral 33 denotes a frequency data changeover switch, and when picking up data, the movable piece is connected to the b side as shown in the figure, and when the picking is finished, it is switched to the a side. Reference numeral 32a denotes a PWMα calculation unit into which the output of the frequency setting amplifier circuit 10, the DC voltage Va, and the output (residual) voltage VH are input to obtain a phase control angle α at the output. 32
c as voltage data Va.
３４は電圧データ切換スイッチで、拾い上げ時は図示の
ように可動片がｂ側に接続されていて、拾い上げが終る
とａ側に切換えられる。３２ ｅ ＶｉＰＷＭＰＩ演算
部で、この演算部３２ ｅには電圧設定増幅回路９の出
力と出力電圧ＶＭとの偏差出力が入力てれる。この偏差
出力は第４つき合せ部３５によシ得る。３２ｆは周波数
設定加減指令部で、この指令部３２ ｆは拾い上げ時の
ＰＷＭα演算をアナログ系に切換えるに際して、例えば
周波数設定器１の設定値と指令部３２ ｆで設定した値
とに差が生じたときに第１つき合せ部２に加減指令を与
えることによって、デジタル系よりアナログ系への切換
をスムーズに行えるようにしたものである。３６はＰＷ
Ｍ発生回路３２ ｏの出力によシインバータ２１をＰＷ
Ｍ制御するためのベースドライブ回路である。Reference numeral 34 denotes a voltage data changeover switch, the movable piece of which is connected to the b side as shown in the figure during picking up, and is switched to the a side when picking up is completed. 32e is a ViPWMPI calculation section, and the deviation output between the output of the voltage setting amplifier circuit 9 and the output voltage VM is input to this calculation section 32e. This deviation output can be obtained by the fourth matching section 35. 32f is a frequency setting adjustment command section, and this command section 32f is used when switching the PWMα calculation at the time of pickup to an analog system, for example, when a difference occurs between the set value of the frequency setter 1 and the value set by the command section 32f. By occasionally giving an adjustment command to the first matching section 2, it is possible to smoothly switch from a digital system to an analog system. 36 is PW
The inverter 21 is powered by the output of the M generation circuit 32 o.
This is a base drive circuit for M control.
次に上記実施例の動作を第２図により述べる。Next, the operation of the above embodiment will be described with reference to FIG.
時点ｔ１にて商用電源でのインバータ２１の運転が停止
される。運転停止によシ、時点ｔ１から電動機２４０回
転は減速を始める。これとともに電動機２４の残留電圧
Ｖ旧は電動機時定数と回転数低下により次第に減衰され
る。At time t1, operation of the inverter 21 using the commercial power source is stopped. When the operation is stopped, the motor 240 rotations start to decelerate from time t1. At the same time, the residual voltage Vold of the electric motor 24 is gradually attenuated by the motor time constant and the decrease in rotational speed.
まず、残留電圧■旧の有無を検出する。この電圧Ｖ旧は
例えばアナログ・デジタル変換して、演算処理部３２で
判別し、例えば定格の１０％以下であれば残留電圧Ｖ旧
を無と判断する。残留電圧ＶＨＩがないときには突入電
流を考慮しなくてよい。First, the presence or absence of residual voltage ■old is detected. This voltage Vold is, for example, subjected to analog-to-digital conversion and determined by the arithmetic processing unit 32, and if it is, for example, 10% or less of the rating, the residual voltage Vold is determined to be null. When there is no residual voltage VHI, there is no need to consider inrush current.
■旧が無と判断された後、時点１．にてシーケンス人力
ＲＵＮ指令と拾い上げ指令により雷、動機２４の回転中
の拾い上げに入る。ここでアナログ系のクッション回路
４１周波数増幅回路６及び電流増幅回路７の各短絡用ス
イッチＡＰＲがオフされるとともに、ＰＡＭ電圧増幅回
路１３の短絡用スイッチＰＡＭＶＴのオフによシコンバ
ータ１６が始動される。このとき、直流電圧Ｖｄの上昇
を遠くするために、クッション回路４にクッションパス
指令（図中破線がクッションパスを示す）を与える。■After the old is determined to be null, time 1. At this point, the sequence manual RUN command and pick-up command begin to pick up the lightning while the motive 24 is rotating. At this point, the short circuit switches APR of the analog cushion circuit 41, the frequency amplification circuit 6, and the current amplification circuit 7 are turned off, and the converter 16 is started by turning off the short circuit switch PAMVT of the PAM voltage amplification circuit 13. . At this time, a cushion path command (the broken line in the figure indicates the cushion path) is given to the cushion circuit 4 in order to prevent the DC voltage Vd from increasing further.
その後、時点ｔ３にて周波数設定増幅回路６の出力上昇
が完了すると前記クッションパス指令を解除させる。Thereafter, when the output increase of the frequency setting amplifier circuit 6 is completed at time t3, the cushion pass command is canceled.
その後、時点ｔ４で開閉器２３がオンされ、ＰＷＭ発生
回路３２ ｃの周波数データＦＢを商用電源周波数にセ
ットし、電圧データＶ８は零としてインバータ２１のゲ
ートしゃ断を解除させる。その後ｓＦｅは一定の状態に
保ち％ ＶｓをＰＷＭの演算部３２ａにより出力させて
インバータ２１を始動させクッション時間Ｔ旧で華初の
予備励磁電圧値まで時点ｔｓまで上昇させ、これを電動
機２４に印加させる。このとき電圧は定格電圧の１０〜
２０９ｃ位である。なお励磁時間Ｔｗ旧は時点１．まで
である。Thereafter, at time t4, the switch 23 is turned on, the frequency data FB of the PWM generation circuit 32c is set to the commercial power supply frequency, the voltage data V8 is set to zero, and the gate cut-off of the inverter 21 is released. Thereafter, sFe is kept in a constant state and %Vs is outputted by the PWM calculation unit 32a to start the inverter 21, and the voltage is increased to the initial pre-excitation voltage value at time ts during the cushion time T, and this is applied to the motor 24. let At this time, the voltage is 10 to 10% of the rated voltage.
It is around 209c. Note that the excitation time Tw old is at time 1. That's it.
時点ｔｌｌで励磁を完了すると、インバータ２１をゲー
トシゃ断し、電動機２４の残留電圧が励磁電圧の１／２
以上発生するかどうかを判別する。残留電圧が励磁電圧
の１／！以上発生していないので、インバータ２１の出
力周波数ｆｎを次式でもって段階的に下げる。When excitation is completed at time tll, the gate of the inverter 21 is cut off, and the residual voltage of the motor 24 becomes 1/2 of the excitation voltage.
Determine whether or not the above occurs. The residual voltage is 1/ of the excitation voltage! Since this has not occurred, the output frequency fn of the inverter 21 is lowered step by step using the following equation.
ｆｎ ＝ ｆｎ−ｔ ｆｎ−ｔ／１６なお、周波数の
下げ幅はｆｎ−ｘ１５以下ならｆｎ−ｔ、４６以外でも
よい。fn = fn-t fn-t/16 Note that the frequency reduction width may be other than fn-t and 46 as long as it is less than fn-x15.
時点ｔ６で周波数ｆｎを下げて再び励磁電圧を電動機２
４に印加させる。電動機２４の残留電圧が励磁電圧の１
／２以上になったかどうかを再び判別する。At time t6, the frequency fn is lowered and the excitation voltage is again applied to the motor 2.
4. The residual voltage of the motor 24 is 1 of the excitation voltage.
/2 or more is determined again.
以後残留電圧が励磁電圧の１／２以上発生しなければ周
波数ｆｎを図示のように段階的に下げ、同一の励磁処理
を繰返す。このとき、周波数ｆｎを下げて行くと、電動
機のすベシが小さくなってくると電動機２４の回転数は
上昇してくる。このため、低回転数で回転している場合
でも、上記のような処理を繰返すことにより、回転数が
上昇してくるので拾い上げが容易となる。Thereafter, unless a residual voltage of 1/2 or more of the excitation voltage is generated, the frequency fn is lowered stepwise as shown, and the same excitation process is repeated. At this time, as the frequency fn is lowered, the speed of the motor becomes smaller and the rotational speed of the motor 24 increases. Therefore, even if it is rotating at a low rotational speed, by repeating the above process, the rotational speed will increase, making it easier to pick up the rotational speed.
なお、時点ｔ６からｔ１４までの処理において、励磁電
圧を一定としているため、インバータ２１の出力周波数
ｆｎを下げてくると出力電流Ｉｙも増加してくる。この
ため、励磁電圧まで出力電圧を上昇させる途中で定格電
流を越えたときにはその時点でインバータ２１のゲート
しゃ断を行なって残留電圧の発生を調べる。残留電圧が
励磁電圧の１／２以上発生しなければ周波数ｆｎを下げ
て同様の処理を行なう。Note that in the process from time t6 to t14, the excitation voltage is kept constant, so as the output frequency fn of the inverter 21 is lowered, the output current Iy also increases. Therefore, when the rated current is exceeded while increasing the output voltage to the excitation voltage, the gate of the inverter 21 is cut off at that point to check for residual voltage. If a residual voltage of 1/2 or more of the excitation voltage is not generated, the frequency fn is lowered and the same process is performed.
上記励磁処理で出力周波数ｆを低下させて行くと、図示
のように出力電流Ｉｖけ増加してくる。As the output frequency f is lowered in the above excitation process, the output current increases by Iv as shown in the figure.
そこで周波数ｆの低下は出力電流ＩＭが定格電流を越え
るか、予めセットされた励磁下限周波数までとする。時
点ｔ１８で励磁下限周波数においても残留電圧が励磁電
圧の１／！以上発生しないので、その周波数をホールド
し、時点ｔ１４の処理に移動。Therefore, the frequency f is reduced until the output current IM exceeds the rated current or until the excitation lower limit frequency is set in advance. At time t18, even at the excitation lower limit frequency, the residual voltage is 1/! of the excitation voltage! Since no more occurrences occur, the frequency is held and the process moves to time t14.
ホールドされた周波数はＰＷＭ発生回路３２ ａの周波
数データＦＢと畜れ、そわの電圧データ■８は零とされ
てインバータ２１のゲートしゃ断を解除する。ＦＢは一
定のまま、 ＶｓをＰＷＭα演算部３２ａの出力により
クッション時間Ｔｏｗで上昇させる。The held frequency is stored as the frequency data FB of the PWM generating circuit 32a, and the voltage data 8 is set to zero, thereby releasing the gate cut-off of the inverter 21. While FB remains constant, Vs is increased by the cushion time Tow by the output of the PWMα calculation unit 32a.
■８を上昇させる過程でＩＭの出力電流が時点ｔｌで１
００％を越えると、Ｆｓをクッションで低下させる。こ
のとき時点ｔｌｌからｔｌｌｌまでＶｓの上昇をストッ
プさせて、Ｖｓをホールドさせる。なお、Ｆｓを低下さ
せる途中、回生モードに入ればＰ８の低下を停止させ、
回生のすべり周波数分だけＦＢを上昇させる。■In the process of increasing 8, the output current of IM becomes 1 at time tl.
If it exceeds 00%, Fs is lowered by a cushion. At this time, the rise in Vs is stopped from time tll to tllll, and Vs is held. In addition, if you enter regeneration mode while decreasing Fs, the decrease in P8 will be stopped.
FB is increased by the regeneration slip frequency.
前記Ｆ８を低下させて出力電流ＩＭが時点ｔｔｓで定格
以内（１００Ｖ１以内）になると、ＦＢの低下を停止さ
せ、そのデータ値で周波数ｆをホールド（ｔＨ）させる
。一方、Ｖθの方は再変クッションで時点ｔｒｙまで上
昇させ、出力電圧ＶＭを上昇させる。ＦＢのｖＺｆＨ値
（ｆｙホールド値）に相当する電圧までＶｓが上昇、す
なわち出力電圧ＶＭがＶ／ｆｉで上昇したとき、Ｖｓの
クッション上昇を停止させる。これにより電動機２４の
拾い上げを完了と判断する。このとき、インバータ出力
周波数ｆのホールド値ｆＨと周波数設定器の設定値とを
比較し％ （Ｆ設定値−ｆＨ）分だけＦ設定加減指令
部３２ ｔから減指令を送出する。これによシ周波数設
定増幅回路１０の出力はｆＨに向ってアナログクッショ
ンで時点ｔ１ｓ ’！で低下する。時点ｔ１・にて回路
１０の出力とｆＨとが等しくなったなら、ＰＷＭ発生回
路３２ ｏを拾い上げ側から周波数設定増幅回路１０の
出力側へスイッチ３３を切換える。これと同時にスイッ
チ３４も切換えてＰＷＭＰＩ演算部３２ ｅの出力がＰ
ＷＭ発生回路３２ ｃに供給されるようにする。When the output current IM becomes within the rating (within 100V1) at time tts by decreasing F8, the decrease in FB is stopped and the frequency f is held (tH) at that data value. On the other hand, Vθ is increased by a re-variable cushion until time try, and the output voltage VM is increased. When Vs rises to a voltage corresponding to the vZfH value (fy hold value) of FB, that is, when the output voltage VM rises by V/fi, the cushion rise of Vs is stopped. Thereby, it is determined that the picking up of the electric motor 24 is completed. At this time, the hold value fH of the inverter output frequency f is compared with the setting value of the frequency setter, and a reduction command is sent from the F setting adjustment command section 32t by % (F setting value - fH). As a result, the output of the frequency setting amplifier circuit 10 is an analog cushion toward fH at the time t1s'! It decreases. When the output of the circuit 10 becomes equal to fH at time t1, the switch 33 is switched from the pickup side of the PWM generation circuit 32o to the output side of the frequency setting amplifier circuit 10. At the same time, the switch 34 is also changed so that the output of the PWMPI calculation section 32e becomes P.
The signal is supplied to the WM generating circuit 32c.
これにより自動制御系への切換を完了し、切換後の安定
性を確保するためウェイト時間ＴｗＨｇ を設ける。This completes the switch to the automatic control system, and a wait time TwHg is provided to ensure stability after the switch.
時点ｔ１・になったなら、Ｆ設定域指令を解除し、ＲＵ
Ｎアンサを出力して周波数設定器１の設定値までアナロ
グクッションで上昇し、時点１、で拾い上げを完了する
。At time t1, the F setting range command is canceled and the RU
The N answer is output and the frequency rises to the set value of the frequency setter 1 using an analog cushion, and the pickup is completed at time point 1.
■０発明の効果
以上述べたように、この発明によれば次に述べるような
効果がある。■0 Effects of the invention As described above, this invention has the following effects.
（１）回転中の電動機に最高周波数から周波数をげなが
ら予備励磁電圧を印加させ、その電圧の１／！以上の残
留電圧が発生するまで励磁を繰返す過程で、励磁下限周
波数になつ念なら出力電圧を上昇させ、出力電流が定格
電流を越えたなら前記周波数を低下させて拾い上げ処理
に入るようにしたので、確寮かつ円滑な拾い上げが可能
となる。(1) Apply a pre-excitation voltage to the rotating electric motor while increasing the frequency from the highest frequency, and apply a pre-excitation voltage to the rotating motor, increasing the frequency to 1/1 of that voltage. In the process of repeating excitation until the above residual voltage is generated, if the excitation lower limit frequency is reached, the output voltage is increased, and if the output current exceeds the rated current, the frequency is lowered and the pick-up process begins. This makes it possible to pick up students in the dormitory and in a smooth manner.
（２）拾い上げ処理時にＰＷＭ制御を用いることによシ
円滑な拾い上げが可能となった。(2) By using PWM control during the pick-up process, smooth pick-up is possible.
（３） マイコンを採用することによシアナログ系へ
の切換が容易にできる。(3) By using a microcontroller, it is easy to switch to a cyanalog system.
（４）残留電圧無でかつ回転数検出無の状態でも拾い上
げが可能となった。(4) Pick-up is now possible even when there is no residual voltage and no rotation speed detection.
【図面の簡単な説明】
第１図はこの発明の一夾施例を示すブロック図、第２図
は第１の動作を説明するタイムチャートである。
１０・周波数設定器、９・・・電圧設定増幅回路、１０
・・−周波数設定増幅回路、１３・・・ＰＡＭ電圧増幅
回路、１６０・順変換装置、２１・・・逆変換装置、２
３・・・開閉器、２４・０電動機、３２・・・演算処理
部、３２ ｂ・・・周波数演算部、３２ｃΦ・・ＰＷＭ
発生回路、３２ｅ・・・ＰＷＭＰ■演算部、３２ （１
−−−Ｐ ＷＭ位相制御角演算部。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a time chart explaining the first operation. 10. Frequency setting device, 9... Voltage setting amplifier circuit, 10
...-Frequency setting amplification circuit, 13... PAM voltage amplification circuit, 160, forward conversion device, 21... inverse conversion device, 2
3... Switch, 24.0 electric motor, 32... Arithmetic processing section, 32 b... Frequency computing section, 32cΦ... PWM
Generation circuit, 32e...PWMP■ operation section, 32 (1
---P WM phase control angle calculation unit.
Claims (1)
逆変換装置を使用した電動機の拾い上げ方法において、
逆変換装置の出力電圧が喪失された後、電動機の残留電
圧の有無を検出する工程と、残留電圧が無しと検出され
た後、ＰＷＭ発生回路に与える周波数データを商用電源
周波数にセットするとともに電圧データをＰＷＭ位相制
御角演算部から与えて一定時間の間逆変換装置を駆動さ
せて最初の予備励磁電圧を送出する工程と、この予備励
磁電圧により電動機の残留電圧が励磁電圧の１／２以上
発生するかどうかを判別する工程と、この判別工程で励
磁電圧の１／２以上でないと判別されたなら逆変換装置
を再び動作させ、その出力周波数を段階的に下げ、周波
数を下げるたび毎に予備励磁電圧を送出する工程と、こ
の工程を励磁下限周波数まで行つても残留電圧が励磁電
圧の１／２以上発生しないならその下限周波数をホール
ドする工程と、この工程でホールドされた下限周波数を
ＰＷＭ発生回路の周波数データとして与えるとともにＰ
ＷＭ位相制御角演算部の電圧データを徐々にＰＷＭ発生
回路に与え、逆変換装置の出力電圧を上昇させる工程と
、この工程により逆変換装置の出力電圧を上昇させる過
程で出力電流が定格値を越えたときに逆変換装置の出力
周波数を低下させるとともに出力電圧をホールドさせて
出力電流が定格値以内に入るようにさせる工程と、電流
が定格値以内に入つた後、出力周波数の低下を停止させ
てホールドし徐々に逆変換装置の出力電圧を上昇させる
工程と、この工程の処理のとき、周波数設定器の設定値
と逆変換装置の出力周波数に差があつたときには周波数
加減指令を与え、その後、前記差がなくなつたなら、Ｐ
ＷＭ発生回路をアナログ系出力で処理させる工程とを備
えたことを特徴とする電動機の拾い上げ方法。(1) In a method for picking up an electric motor using a PAM-controlled forward conversion device and a PWM-controlled inverse conversion device,
After the output voltage of the inverter is lost, there is a process of detecting the presence or absence of residual voltage in the motor, and after it is detected that there is no residual voltage, the frequency data given to the PWM generation circuit is set to the commercial power frequency and the voltage is A process of supplying data from the PWM phase control angle calculation unit to drive the inverter for a certain period of time to send out the first pre-excitation voltage, and this pre-excitation voltage causes the residual voltage of the motor to be 1/2 or more of the excitation voltage. There is a process of determining whether or not it occurs, and if it is determined in this determination process that it is not 1/2 or more of the excitation voltage, the inverter is operated again and its output frequency is lowered step by step, each time the frequency is lowered. A step of transmitting a preliminary excitation voltage, a step of holding the lower limit frequency if a residual voltage of 1/2 or more of the excitation voltage is not generated even if this step is performed up to the excitation lower limit frequency, and a step of holding the lower limit frequency held in this step. Provide it as the frequency data of the PWM generation circuit and P
The voltage data of the WM phase control angle calculating section is gradually applied to the PWM generation circuit to increase the output voltage of the inverter, and in the process of increasing the output voltage of the inverter, the output current reaches the rated value. The process of lowering the output frequency of the inverter and holding the output voltage so that the output current is within the rated value when the current exceeds the rated value, and stopping the reduction of the output frequency after the current is within the rated value. and holding the output voltage of the inverter to gradually increase the output voltage of the inverter.During this step, when there is a difference between the set value of the frequency setter and the output frequency of the inverter, a frequency adjustment command is given. After that, if the difference disappears, P
A method for picking up an electric motor, comprising the step of processing a WM generating circuit with an analog output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61049848A JPH0667274B2 (en) | 1986-03-07 | 1986-03-07 | How to pick up an electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61049848A JPH0667274B2 (en) | 1986-03-07 | 1986-03-07 | How to pick up an electric motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62210890A true JPS62210890A (en) | 1987-09-16 |
| JPH0667274B2 JPH0667274B2 (en) | 1994-08-24 |
Family
ID=12842478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61049848A Expired - Lifetime JPH0667274B2 (en) | 1986-03-07 | 1986-03-07 | How to pick up an electric motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0667274B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001022570A1 (en) * | 1999-09-21 | 2001-03-29 | Kabushiki Kaisha Yaskawa Denki | Method of controlling ac motor and controller |
-
1986
- 1986-03-07 JP JP61049848A patent/JPH0667274B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001022570A1 (en) * | 1999-09-21 | 2001-03-29 | Kabushiki Kaisha Yaskawa Denki | Method of controlling ac motor and controller |
| US6815924B1 (en) | 1999-09-21 | 2004-11-09 | Kabushiki Kaisha Yaskawa Denki | Method of controlling AC motor and controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0667274B2 (en) | 1994-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5705904A (en) | Frequency converter device which adaptively responds to a power failure | |
| US9647597B2 (en) | Motor control apparatus and method for controlling motor | |
| US8030870B2 (en) | Method and device for reducing the influence of a DC component in a load current of an asynchronous three-phase motor | |
| RU2497267C1 (en) | Method of smooth start of asynchronous motor with squirrel-cage rotor | |
| US9641120B2 (en) | Motor control apparatus and method for controlling motor | |
| JPS62210890A (en) | Picking-out method for motor | |
| JPS62144593A (en) | Picking-out method for motor | |
| JP4077326B2 (en) | Method of processing regenerative power of inverter device and inverter device used in this method | |
| JPS62160093A (en) | Picking up method for motor | |
| JP2979765B2 (en) | Inverter for synchronous motor | |
| JP3282321B2 (en) | Inverter device | |
| JPH0667275B2 (en) | How to pick up an electric motor | |
| JP2003165678A (en) | Controller for elevator | |
| JP3678781B2 (en) | AC motor control device | |
| JPH01231685A (en) | Voltage type inverter | |
| JPH06296396A (en) | Method and device for controlling speed of induction motor | |
| JP2002204594A (en) | Motor control equipment | |
| JPH0757120B2 (en) | How to pick up an electric motor | |
| JPS58130795A (en) | Power source for driving ac motor | |
| JP2645144B2 (en) | Motor control device | |
| JPS6019519Y2 (en) | Electric motor speed setting control device | |
| JPS6127994B2 (en) | ||
| JPS62201095A (en) | Motor pick-up method | |
| JPH088782B2 (en) | Electric motor controller | |
| JPS6074986A (en) | Controlling method of voltage type inverter device |