JPH0870594A - Method for restarting after voltage drop or instantaneous power failure in inverter - Google Patents
Method for restarting after voltage drop or instantaneous power failure in inverterInfo
- Publication number
- JPH0870594A JPH0870594A JP5096987A JP9698793A JPH0870594A JP H0870594 A JPH0870594 A JP H0870594A JP 5096987 A JP5096987 A JP 5096987A JP 9698793 A JP9698793 A JP 9698793A JP H0870594 A JPH0870594 A JP H0870594A
- Authority
- JP
- Japan
- Prior art keywords
- rotation
- motor
- inverter
- signal
- reverse
- 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
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はインバ−タ運転中に電圧
低下または瞬時停電が発生し、復電時に正常に始動する
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting normally when power is restored due to voltage drop or momentary power failure during inverter operation.
【0002】[0002]
【従来の技術】図1は従来実施されているインバ−タ回
路構成図を示すものであり、1が商用交流電源でコンバ
−タ部2を通して、リップルを含む直流電圧に変換し、
平滑用コンデンサ3により、リップルを含まない直流電
圧となる。4は直流を交流に変換するインバ−タ部で、
インバ−タ部4を通して出力が電動機5に印加される。
6は制御部で、駆動回路部7、A/D変換器8、インタ
−フェ−ス回路9、CPU部10、不揮発性記憶素子1
1から構成されている。2. Description of the Related Art FIG. 1 is a diagram showing a conventional inverter circuit configuration, in which a commercial AC power source 1 converts a DC voltage including ripples through a converter unit 2,
The smoothing capacitor 3 produces a DC voltage that does not include ripples. 4 is an inverter unit for converting direct current into alternating current,
The output is applied to the electric motor 5 through the inverter unit 4.
A control unit 6 includes a drive circuit unit 7, an A / D converter 8, an interface circuit 9, a CPU unit 10, and a non-volatile memory element 1.
1 is comprised.
【0003】周波数設定器12で設定されたアナログ信
号である周波数設定用入力電圧はA/D変換器8に入力
され、デジタル信号に変換されて、CPU部10に入力
される。一方正転用スイッチ13または逆転用スイッチ
14のいずれかを閉路すると、外部信号をアイソレ−ト
するインタ−フェ−ス回路9を通してCPU部10に正
転または逆転信号が入力される。CPU部10は全ての
演算処理を行なうところで、演算結果や各種パラメ−タ
のデ−タを格納した不揮発性記憶素子11からデ−タを
読み出して演算処理を行なう。CPU部10から演算さ
れた信号は駆動回路部7に入力され、更に増幅されてイ
ンバ−タ部4を駆動する。A frequency setting input voltage, which is an analog signal set by the frequency setting unit 12, is input to the A / D converter 8, converted into a digital signal, and input to the CPU section 10. On the other hand, when either the normal rotation switch 13 or the reverse rotation switch 14 is closed, the normal rotation or reverse rotation signal is input to the CPU section 10 through the interface circuit 9 which isolates an external signal. When the CPU section 10 performs all the arithmetic processing, the CPU section 10 reads the data from the non-volatile memory element 11 in which the arithmetic result and the data of various parameters are stored and performs the arithmetic processing. The signal calculated from the CPU unit 10 is input to the drive circuit unit 7, is further amplified, and drives the inverter unit 4.
【0004】図2はインバ−タの正転、逆転の動作説明
図で、正転信号が入力されると出力周波数は設定された
加速時間に従い正転方向に出力し、設定周波数で運転す
る。その後正転信号が開となり、逆転信号が閉となると
設定された減速時間に従い減速し停止し、一定時間休止
後、出力周波数は設定された加速時間に従い、逆転方向
に出力し、設定周波数で運転する。FIG. 2 is an explanatory view of the normal rotation and reverse rotation of the inverter. When the normal rotation signal is input, the output frequency is output in the normal rotation direction according to the set acceleration time, and the inverter operates at the set frequency. After that, when the forward rotation signal is opened and the reverse rotation signal is closed, the motor decelerates and stops according to the set deceleration time.After a certain period of rest, the output frequency is output in the reverse rotation direction according to the set acceleration time, and runs at the set frequency. To do.
【0005】図3はインバ−タの瞬時停電時の動作説明
図で、正転信号入力が入り正転方向に設定周波数で運転
後、正転信号が開となり、逆転信号が閉となり設定され
た減速時間で減速中、瞬時停電が発生し、停電した時の
動作状態を示す図である。時間t1において瞬時停電が
発生するとインバ−タは停止し、出力周波数は0となる
が、電動機は慣性により正転方向に回転し続けている。
次に時間t2で復電した場合、インバ−タは電動機の回
転数に同期した周波数を出力しようとするが、時間t2
においては逆転信号が入力されているため、逆転方向の
周波数を出力する。このために正常に起動できず場合に
よってはインバ−タの過電流保護回路が動作し、停止す
る場合があった。FIG. 3 is a diagram for explaining the operation of the inverter during a momentary power failure. The normal signal is input and the normal signal is operated in the normal direction at the set frequency, and then the normal signal is opened and the reverse signal is closed. It is a figure which shows the operation state at the time of a power failure, when an instantaneous power failure occurred during deceleration in deceleration time. When an instantaneous power failure occurs at time t1, the inverter stops and the output frequency becomes 0, but the electric motor continues to rotate in the forward direction due to inertia.
Next, when power is restored at time t2, the inverter tries to output a frequency synchronized with the rotation speed of the motor, but at time t2
Since the reverse rotation signal is input at, the frequency in the reverse rotation direction is output. For this reason, the inverter cannot be normally started, and in some cases, the overcurrent protection circuit of the inverter operates and stops.
【0006】[0006]
【発明が解決しようとする課題】電動機の運転中、イン
バ−タの信号入力が切り換わった直後に電圧低下または
瞬時停電が発生し、電動機の減速中に復電したときに切
り換わった信号入力の方向の周波数を出力するため、場
合によっては過電流保護回路が動作し停止することを防
ぎ、円滑に電動機の回転方向が切り換える方法に関して
である。During operation of the electric motor, a voltage drop or an instantaneous power failure occurs immediately after the signal input of the inverter is switched, and the signal input is switched when the electric power is restored during deceleration of the electric motor. The present invention relates to a method of outputting a frequency in the direction of, thereby preventing the overcurrent protection circuit from operating and stopping in some cases, and smoothly switching the rotation direction of the electric motor.
【0007】[0007]
【課題を解決するための手段】運転中に電動機の回転方
向のデ−タを不揮発性記憶素子11に記憶し、復電時に
入力されている信号入力と前述の不揮発性記憶素子11
に記憶している電動機の回転方向のデ−タを比較判断
し、電動機の回転方向に合わせて始動してから復電時の
入力信号に回転を切り換えることによって解決を図っ
た。Data of the rotating direction of the electric motor is stored in a non-volatile memory element 11 during operation, and the signal input which is input at the time of power recovery and the above-mentioned non-volatile memory element 11 are stored.
The problem was solved by comparing and judging the data in the direction of rotation of the electric motor stored in the above, and switching the rotation to the input signal at the time of power recovery after starting according to the direction of rotation of the electric motor.
【0008】[0008]
【発明の作用】電動機の運転方向を決定する信号入力が
切り換わった直後に電圧低下または瞬時停電が発生し、
電動機の減速中に復電した場合、正常に始動することが
できる。The voltage drop or the instantaneous power failure occurs immediately after the signal input for determining the operating direction of the motor is switched,
If power is restored during deceleration of the motor, it can start normally.
【0009】[0009]
【表1】 はインバ−タの運転方向と入力信号の組合わせを示した
表、図4はインバ−タの運転方向と入力信号との関係を
示した図で、[Table 1] Is a table showing the combination of the operating direction of the inverter and the input signal, and FIG. 4 is a diagram showing the relationship between the operating direction of the inverter and the input signal.
【表1】に示すように運転状態を3通りに分類しそのデ
−タを不揮発性記憶素子11の逆転モ−ドと設定された
番地に格納する。逆転モ−ド=0は停止または運転方向
と入力信号の方向が一致した場合で、逆転モ−ド=1は
運転方向が正転で入力信号が逆転方向の場合で、逆転モ
−ド=2は運転方向が逆転で入力信号が正転方向の場合
である。As shown in Table 1, the operating states are classified into three types, and the data are stored in the non-volatile memory element 11 at the address set as the reverse mode. Reverse mode = 0 is when the direction of the input signal coincides with the stop or driving, and reverse mode = 1 is when the driving direction is forward and the input signal is reverse direction, the reverse mode = 2 Shows the case where the driving direction is reverse and the input signal is forward.
【0010】図5は本発明のインバ−タの瞬時停電時の
動作説明図で、正転信号入力が入り正転方向設定周波数
で運転後、正転信号が開となり設定された減速時間で減
速中、瞬時停電が発生し、復電した時の動作状態を示す
図である。時間t1において瞬時停電が発生するとイン
バ−タは停止し、周波数は0となるが、時間t2で復電
すると、図6の電源が起動してからインバ−タの正転、
逆転の判断を行なうフロ−チャ−ト図に示すように不揮
発性記憶素子11内で、ステップ21の電源ON起動と
なり、次にステップ22の拾い上げモ−ドを読み出す。
その場合、ステップ22で拾い上げモ−ドが設定されて
いなければ、従来の図3の運転方法と判断し、ステップ
23の正転信号があるかどうかへ進み、正転信号があれ
ばステップ24の正転加速運転となる。ステップ23で
正転信号がない場合は、ステップ25で逆転信号がある
ものと判断し、ステップ26の逆転加速運転となる。FIG. 5 is a diagram for explaining the operation of the inverter of the present invention during a momentary power failure. After the forward rotation signal is input and the inverter operates at the forward rotation direction set frequency, the forward rotation signal opens and the motor decelerates for the set deceleration time. It is a figure which shows the operation state at the time of a middle and momentary power failure generate | occur | produced, and power is restored. When an instantaneous power failure occurs at time t1, the inverter stops and the frequency becomes 0. However, when power is restored at time t2, the power supply in FIG.
As shown in the flow chart for determining the reverse rotation, the power is turned on in step 21 in the nonvolatile memory element 11, and then the pick-up mode in step 22 is read.
In this case, if the pick-up mode is not set in step 22, it is judged that the operation method is the conventional one shown in FIG. 3, and the process proceeds to step 23 to see if there is a normal rotation signal. Forward rotation acceleration operation is performed. If there is no forward rotation signal in step 23, it is determined in step 25 that there is a reverse rotation signal, and the reverse rotation acceleration operation in step 26 is performed.
【0011】ステップ22の拾い上げモ−ドを読み出
し、拾い上げモ−ドが設定されていれば、電源ON起動
時の入力信号により拾い上げの回転方向を決定するた
め、ステップ27の逆転モ−ド=1へ進む。運転状態が
表1に示すように運転方向が正転で入力信号が逆転の場
合、逆転モ−ド=1と判断し、ステップ28で正転信号
がなければステップ29で正転拾い上げとなり正転方向
へ出力し、その後ステップ30で減速停止となり、次に
ステップ31で逆転加速となり、円滑に電動機の回転方
向が正転から逆転へ切り換わる。ステップ28で正転信
号があれば、ステップ32の正転拾い上げへ進み正転方
向へ出力する。If the pick-up mode of step 22 is read and the pick-up mode is set, the rotation direction of pick-up is determined by the input signal when the power is turned on. Go to. If the driving direction is normal and the input signal is reverse as shown in Table 1, it is judged that the reverse mode is 1, and if there is no forward signal in step 28, normal rotation is picked up in step 29 and normal rotation is taken. Direction, and then in step 30, deceleration and stop are performed, and then in step 31, reverse rotation acceleration is performed, and the rotation direction of the electric motor smoothly switches from forward rotation to reverse rotation. If there is a normal rotation signal in step 28, the normal rotation pick-up is proceeded to in step 32 and output in the normal rotation direction.
【0012】ステップ27で逆転モ−ド=1でない場
合、ステップ33の逆転モ−ド=2へ進む。運転状態が
表1に示すように運転方向が逆転で入力信号が正転の場
合、逆転モ−ド=2と判断し、ステップ34で逆転信号
がなければ、ステップ35で逆転拾い上げとなり逆転方
向へ出力し、その後ステップ36で減速停止となり、次
にステップ37で正転加速となり、円滑に電動機の回転
方向が逆転から正転へ切り換わる。ステップ34で逆転
信号があれば、ステップ38の逆転拾い上げへ進み逆転
方向へ出力する。If the reverse mode is not 1 in step 27, the process proceeds to reverse mode = 2 in step 33. When the driving direction is reverse rotation and the input signal is forward rotation as shown in Table 1, it is judged that the reverse rotation mode is 2. If there is no reverse rotation signal in step 34, the reverse rotation is picked up in step 35 and the reverse rotation direction is set. After that, the output is decelerated and stopped at step 36, and then forward rotation acceleration is performed at step 37, and the rotation direction of the electric motor is smoothly switched from reverse rotation to forward rotation. If there is a reverse rotation signal in step 34, the operation proceeds to reverse rotation pickup in step 38 and outputs in the reverse rotation direction.
【0013】ステップ33で逆転モ−ド=2でない場合
は、電源ON起動時に入力信号が無ければ出力はしない
が、電源ON起動後に前記入力信号が入力されれば、正
転または逆転の拾い上げを行なうということで、ステッ
プ39で正転信号があれば、ステップ32の正転拾い上
げへ進み正転方向へ出力し、ステップ39で正転信号が
なければステップ38の逆転拾い上げへ進み逆転方向へ
出力する。If the reverse mode is not 2 in step 33, no output is made if there is no input signal when the power is turned on, but if the input signal is input after the power is turned on, the forward rotation or the reverse rotation is picked up. As a result, if there is a forward rotation signal in step 39, the operation proceeds to forward rotation pickup in step 32 and outputs in the forward rotation direction, and if there is no forward rotation signal in step 39, proceeds to reverse rotation pickup in step 38 and outputs in the reverse rotation direction. To do.
【0014】[0014]
【発明の効果】不揮発性記憶素子内に、前述のプログラ
ムを格納することにより、部品点数を増さないで、電圧
低下または瞬時停電の復電時に、電動機の回転方向に合
った出力による拾い上げが可能となり、あらゆる運転状
態における瞬停再始動ができる。By storing the above-mentioned program in the non-volatile memory element, it is possible to pick up by an output suitable for the rotating direction of the electric motor when the voltage drops or the momentary power failure is restored without increasing the number of parts. It becomes possible and restarts after a momentary power failure in any operating condition.
以下次のように説明する。 This will be described below.
【図1】従来実施されているインバ−タ回路構成図。FIG. 1 is a block diagram of an inverter circuit that has been conventionally implemented.
【図2】インバ−タの正転、逆転の動作説明図。FIG. 2 is a diagram for explaining the forward / reverse operation of the inverter.
【図3】インバ−タの瞬時停電時の動作説明図。FIG. 3 is a diagram for explaining the operation of the inverter during a momentary power failure.
【図4】インバ−タの運転方向と入力信号との関係を示
した図。FIG. 4 is a diagram showing a relationship between an operating direction of the inverter and an input signal.
【図5】本発明のインバ−タの瞬時停電時の動作説明
図。FIG. 5 is a diagram for explaining the operation of the inverter of the present invention during a momentary power failure.
【図6】電源が起動してからインバ−タの正転、逆転の
判断を行なうフロ−チャ−ト図。FIG. 6 is a flowchart for determining whether the inverter is rotating normally or reversely after the power source is activated.
1 商用交流電源 2 コンバ−タ部 3 平滑用コンデンサ 4 インバ−タ部 5 電動機 6 制御部 7 駆動回路部 8 A/D変換器 9 インタ−フェ−ス回路 10 CPU部 11 不揮発性記憶素子 12 周波数設定器 13 正転用スイッチ 14 逆転用スイッチ 1 Commercial AC Power Supply 2 Converter Section 3 Smoothing Capacitor 4 Inverter Section 5 Motor 6 Control Section 7 Drive Circuit Section 8 A / D Converter 9 Interface Circuit 10 CPU Section 11 Nonvolatile Storage Element 12 Frequency Setting device 13 Forward rotation switch 14 Reverse rotation switch
Claims (1)
タ部と、該コンバ−タ部の直流出力をパルス幅制御して
交流電動機に印加するインバ−タ部と、該インバ−タ部
をパルス幅制御する制御部と、該制御部は交流電動機の
回転数及び回転方向を制御するCPU部を有し、前記商
用交流電源の電圧低下又は瞬時停電時に交流電動機の回
転数に同期始動するインバ−タにおいて、前記商用交流
電源の電圧低下又は瞬時停電時の回転方向を不揮発性記
憶素子に記憶し、前記電圧低下又は瞬時停電が復電した
時の交流電動機の回転方向と不揮発性記憶素子の記憶デ
−タの比較により交流電動機の回転方向が不一致の時、
前記交流電動機を減速停止し後に交流電動機の回転方
向、回転数に同期してインバ−タ出力を交流電動機に印
加するインバ−タの電圧低下又は瞬停再始動方法。1. A converter for converting a commercial AC power source into a direct current.
An inverter section for controlling the pulse width of the DC output of the converter section and applying it to the AC motor, a control section for controlling the pulse width of the inverter section, and the control section for the AC motor. In the inverter having a CPU unit for controlling the rotation speed and the rotation direction, which starts synchronously with the rotation speed of the AC motor at the time of the voltage drop of the commercial AC power source or the momentary power failure, the voltage drop of the commercial AC power source or the momentary power failure occurs. The rotation direction of the AC motor is stored in a non-volatile storage element, and the rotation direction of the AC motor is not matched by comparing the rotation direction of the AC motor when the voltage drop or the instantaneous power failure is restored with the storage data of the non-volatile storage element. Time,
A method for restarting a voltage drop or an instantaneous blackout of an inverter for applying an inverter output to the AC motor in synchronism with the rotation direction and rotation speed of the AC motor after decelerating and stopping the AC motor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5096987A JPH0870594A (en) | 1993-03-31 | 1993-03-31 | Method for restarting after voltage drop or instantaneous power failure in inverter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5096987A JPH0870594A (en) | 1993-03-31 | 1993-03-31 | Method for restarting after voltage drop or instantaneous power failure in inverter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0870594A true JPH0870594A (en) | 1996-03-12 |
Family
ID=14179568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5096987A Pending JPH0870594A (en) | 1993-03-31 | 1993-03-31 | Method for restarting after voltage drop or instantaneous power failure in inverter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0870594A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101307024B1 (en) * | 2006-11-07 | 2013-09-11 | 가부시끼가이샤가미무라고오교오 | A control method for sensorless permanent magnet synchronous motor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01291693A (en) * | 1988-05-16 | 1989-11-24 | Hitachi Ltd | Restarting device for ac motor |
-
1993
- 1993-03-31 JP JP5096987A patent/JPH0870594A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01291693A (en) * | 1988-05-16 | 1989-11-24 | Hitachi Ltd | Restarting device for ac motor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101307024B1 (en) * | 2006-11-07 | 2013-09-11 | 가부시끼가이샤가미무라고오교오 | A control method for sensorless permanent magnet synchronous motor |
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