JPS61112595A - Controller of ac motor - Google Patents

Controller of ac motor

Info

Publication number
JPS61112595A
JPS61112595A JP59234649A JP23464984A JPS61112595A JP S61112595 A JPS61112595 A JP S61112595A JP 59234649 A JP59234649 A JP 59234649A JP 23464984 A JP23464984 A JP 23464984A JP S61112595 A JPS61112595 A JP S61112595A
Authority
JP
Japan
Prior art keywords
power
circuit
motor
output signal
reactor
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
Application number
JP59234649A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Ejima
江島 一義
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP59234649A priority Critical patent/JPS61112595A/en
Publication of JPS61112595A publication Critical patent/JPS61112595A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/03AC-DC converter stage controlled to provide a defined DC link voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To eliminate a commutation failure at recovery time by first blocking a firing pulse command of a power reactor at momentary power interruption time, then setting the power factor of an AC motor to a power drive motor, and then blocking the firing pulse command of an inverter. CONSTITUTION:When a power interruption occurs during a regenerative operation, it is detected by a momentary power interruption detector 23, its output signal is applied to a phase controller 16 to block a power reactor 12. A comparison calculator 33 calculates and outputs a variation in a power source voltage from the output signal of a voltage detector 29 and a power source voltage reference. When this output signal e3 is added by an adder 34 with a frequency reference 22 and applied to a ring counter 21, the output frequency of a power inverter 14 is raised from the frequency of an AC motor 15. The energy of a DC reactor 13 is returned to the motor 15 at this time and rapidly discharged. Thus, the power reactor is not failed in the commutation at recovery time.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は電流型インバータによって駆動される交流電動
機の制m装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a control device for an AC motor driven by a current type inverter.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

従来の交流電動機の制御装置の一例を第1図に示す。こ
のような制御IVtWlは通常電流型インバータ装置と
よばれており、3相交流電源11に接続される順変換器
12により、3相交流電IT!11は可変直流電源へと
変換される。順変換器12の二次側は平滑用の直流リア
クトル13を介して逆変換器14の一次側と結合してい
る。この逆変換器14により、可変直流電源は可変周波
数交流電源へと変換される。
An example of a conventional AC motor control device is shown in FIG. Such a control IVtWl is called a normal current type inverter device, and the forward converter 12 connected to the three-phase AC power supply 11 converts the three-phase AC power IT! 11 is converted into a variable DC power supply. The secondary side of the forward converter 12 is coupled to the primary side of the inverse converter 14 via a DC reactor 13 for smoothing. This inverter 14 converts the variable DC power source into a variable frequency AC power source.

逆変換器14の二次側には交流電動ta15が接続され
、逆変換器14から得られた可変周波数交流電源によっ
て駆動される。順変換器12には点弧パルス指令が位相
制御回路16により与えられる。また順変換器12に流
れる負荷If流は電流制御回路17により制御され、負
荷電流は電流基準18と順変換器12の一次側に設けら
れた電流検出回路19による検出電流を電流帰還信号と
して用い、この出力信号との偏差信号を取ることによっ
て電流制御回路17により安定に制御されるよう構成さ
れている。また電流基準18は図示しない電圧制御回路
の出力信号として与えられる。一方逆変換器14には位
相差を持つ点弧パルス指令がパルス増巾回路20を介し
て供給される。またパルス増巾回路20にはリングカウ
ンタ回路21から、周波数基準22の信号に基づいて1
200の位相差を持ち、しかも周波数基準22に比例す
るパルスが与えられる。
An AC electric motor TA 15 is connected to the secondary side of the inverter 14 and is driven by a variable frequency AC power source obtained from the inverter 14 . An ignition pulse command is given to the forward converter 12 by a phase control circuit 16 . Further, the load If current flowing through the forward converter 12 is controlled by a current control circuit 17, and the load current is determined by using a current reference 18 and a current detected by a current detection circuit 19 provided on the primary side of the forward converter 12 as a current feedback signal. , and is configured to be stably controlled by the current control circuit 17 by taking a deviation signal from this output signal. Further, the current reference 18 is given as an output signal of a voltage control circuit (not shown). On the other hand, an ignition pulse command having a phase difference is supplied to the inverter 14 via a pulse amplification circuit 20. The pulse amplification circuit 20 also receives a signal from a ring counter circuit 21 based on a signal from a frequency reference 22.
Pulses with a phase difference of 200 and proportional to a frequency reference 22 are provided.

3相交流電源11と順変換器12との接続点には3相交
流電源11の瞬時停止(以下瞬停という)を検出するた
めの瞬停検出回路23が設けられており、この瞬停検出
回路23の出力信号は位相制御回路16およびパルス増
巾回路20にそれぞれ与えられる。このような構成にお
いて3相交8!電源11に瞬停が発生すると、瞬停検出
回路23により位相制御回路16とパルス増巾回路20
の点弧パルス指令とを同時にブロックし、順変換器12
および逆変換器14の運転を停止する。そして3相交流
電源11の復電が、瞬停検出回路23によって検出され
た時点で上述したブロックを解除し、再運転をおこなう
ようにしていた。
An instantaneous power failure detection circuit 23 is provided at the connection point between the three-phase AC power source 11 and the forward converter 12 to detect an instantaneous stoppage (hereinafter referred to as an instantaneous power failure) of the three-phase AC power source 11. The output signal of circuit 23 is given to phase control circuit 16 and pulse amplification circuit 20, respectively. In such a configuration, 3 phase interactions 8! When a momentary power failure occurs in the power supply 11, the momentary power failure detection circuit 23 activates the phase control circuit 16 and the pulse amplification circuit 20.
The ignition pulse command and the forward converter 12 are simultaneously blocked.
and the operation of the inverter 14 is stopped. Then, when the power restoration of the three-phase AC power supply 11 is detected by the instantaneous power failure detection circuit 23, the above-mentioned block is released and the operation is restarted.

第6図は第5図の構成によって駆動される交流電動機1
5の速度特性曲線を示したもので、曲線aはトルク曲線
を、曲線6は力率曲線をそれぞれ示している。横軸は滑
りSを示している。ここで滑り5=−Pの運転つまり回
生運転中に瞬停が発生すると、位相制御回路16とパル
ス増巾回路20の点弧パルス指令を同時にブロックして
も、第7図の等価回路で示されるように電力方向が順変
換器12の出力電圧e、fが(−)、  (+)、逆変
換器14の入力電圧g、hが(−)、  (+)となっ
ているため、順変換器12を構成するサイリスタ素子が
3相交流電源11の電圧でターンオフしないで転流失敗
をおこすことがある。このため運転の継続を必要として
いるボイラ設備や水道設備のためのポンプ用途に適用し
た場合には、回生運転中の瞬停保護における信頼性が欠
けるという欠点があった。
Figure 6 shows an AC motor 1 driven by the configuration shown in Figure 5.
5 shows the speed characteristic curves of No. 5, in which curve a shows the torque curve and curve 6 shows the power factor curve. The horizontal axis shows the slip S. Here, if an instantaneous power failure occurs during operation with slip 5 = -P, that is, during regenerative operation, even if the firing pulse commands of the phase control circuit 16 and pulse amplification circuit 20 are blocked at the same time, the equivalent circuit shown in FIG. The power direction is such that the output voltages e and f of the forward converter 12 are (-) and (+), and the input voltages g and h of the inverse converter 14 are (-) and (+). The thyristor element constituting the converter 12 may not be turned off by the voltage of the three-phase AC power supply 11, causing commutation failure. Therefore, when applied to pumps for boiler equipment or water supply equipment that require continuous operation, there is a drawback that reliability in protection against instantaneous power failure during regenerative operation is lacking.

(発明の目的) 本発明は上記事情を考慮してなされたもので、回生運転
中に瞬停が発生しても復電時に転流失敗をおこすことの
ないような瞬停対策を施した交流電動機の制御装置を提
供することを目的とする。
(Purpose of the Invention) The present invention has been made in consideration of the above circumstances, and is an alternating current that has measures against instantaneous interruptions to prevent commutation failure when power is restored even if an instantaneous interruption occurs during regenerative operation. The purpose of the present invention is to provide a control device for an electric motor.

〔発明の概要〕[Summary of the invention]

本発明は回生運転中に瞬停があった場合の瞬停検出回路
により順変換器の点弧パルス指令をブロックし、同時に
3相交流電源の電圧変動に応じて逆変換器の周波数基準
を交流電動機の周波数によりあげて交流電動機の力率を
カ行モードにしたのち、逆変換器の点弧パルス指令をブ
ロックさせるようにしたものである。
The present invention uses a momentary power failure detection circuit to block the firing pulse command of the forward converter when there is a momentary power failure during regenerative operation, and at the same time changes the frequency reference of the reverse converter to AC in response to voltage fluctuations of the three-phase AC power source. After increasing the frequency of the motor to bring the power factor of the AC motor into a power mode, the ignition pulse command of the inverter is blocked.

このような構成にすることにより順変換器および逆変換
器の電力方向を二分割し、電流リアクトルのエネルギは
交流電動機側にもどし負荷電流をずばやく切って順変換
器側のサイリスタ素子を確実ターンオフさせることがで
きる。
With this configuration, the power direction of the forward converter and inverse converter is divided into two, the energy of the current reactor is returned to the AC motor side, and the load current is quickly cut off, ensuring the thyristor element on the forward converter side. It can be turned off.

〔発明の実施例〕[Embodiments of the invention]

以下本発明の実施例を図面に基づいて詳細に説明する。 Embodiments of the present invention will be described in detail below based on the drawings.

第1図はこの発明の一実施例を示したブロック構成図で
ある。第5図に示した従来の装置と同一部分には同一符
号を付してその説明は省略する。
FIG. 1 is a block diagram showing an embodiment of the present invention. Components that are the same as those of the conventional device shown in FIG. 5 are designated by the same reference numerals, and their description will be omitted.

本実施例では、3相交流電源11の電圧を検出しこの検
出された交流電圧を直流電圧に変化して出力するために
電圧検出回路29が設けられている。また瞬停検出回路
23の出力側にはタイマ回路30が接続され、位相制御
回路16の点弧パルス指令とパルス増巾回路20の点弧
パルス指令との間のブロック時間差を持たせるようにな
っている。逆変換器14の入力電圧極性を検出するため
に極性検出回路31が設けられ、この極性検出回路31
は回生時の極性すなわち第7図に示すように逆変換器1
4の入力側電圧q、hが(−)。
In this embodiment, a voltage detection circuit 29 is provided to detect the voltage of the three-phase AC power supply 11, convert the detected AC voltage into a DC voltage, and output the DC voltage. Further, a timer circuit 30 is connected to the output side of the instantaneous power failure detection circuit 23 to provide a block time difference between the firing pulse command of the phase control circuit 16 and the firing pulse command of the pulse amplification circuit 20. ing. A polarity detection circuit 31 is provided to detect the input voltage polarity of the inverter 14, and this polarity detection circuit 31
is the polarity during regeneration, that is, the inverter 1 as shown in Figure 7.
The input side voltages q and h of 4 are (-).

(+)の時ロジック信号を発生するような動作をおこな
う。32は3相交流電源11の標準電圧に相当する、電
m電圧基準e1である。
When it is (+), it performs an operation that generates a logic signal. Reference numeral 32 indicates a voltage reference e1 corresponding to the standard voltage of the three-phase AC power supply 11.

また33は、電圧検出回路29の出力信号e2と、タイ
マ回路30の出力信号dと、極性検出回路31の出力信
号eとを入力し、回生時に瞬停が発生した時3相交流電
源11の電圧変動に応じて出力信号e3を発生する比較
演算回路である。この比較演算回路33の出力信号e3
は周波数基準22と加算回路34において加算され、リ
ングカウンタ回路21に供給される。このような加算が
おこなわれると、逆変換器14に供給される点弧指令は
交流電動機15の周波数より周波数を高くするような指
令として与えられる。
Further, 33 inputs the output signal e2 of the voltage detection circuit 29, the output signal d of the timer circuit 30, and the output signal e of the polarity detection circuit 31. This is a comparison calculation circuit that generates an output signal e3 in response to voltage fluctuations. Output signal e3 of this comparison calculation circuit 33
is added to the frequency reference 22 and the adder circuit 34, and is supplied to the ring counter circuit 21. When such addition is performed, the ignition command supplied to the inverter 14 is given as a command to make the frequency higher than the frequency of the AC motor 15.

第2図は第1図の装置の動作を説明するためのタイミン
グチャートであって、(a)は電圧検出回路29の出力
信号e と電[11i1圧基準e1の動作波形、(b)
は比較演算回路33の出力信号e3の動作波形、(C)
は瞬停検出回路23の出力信号Cのロジック信号、(C
)はタイマ回路30の出力信号dのロジック信号、(e
)は極性検出回路31の出力信号eのロジック信号であ
る。
FIG. 2 is a timing chart for explaining the operation of the device shown in FIG.
is the operating waveform of the output signal e3 of the comparison calculation circuit 33, (C)
is the logic signal of the output signal C of the instantaneous power failure detection circuit 23, (C
) is the logic signal of the output signal d of the timer circuit 30, (e
) is a logic signal of the output signal e of the polarity detection circuit 31.

回生運転は前述したように第6図に示した速度特性曲線
の負側で滑り5−−8で運転がおこなわれている状態で
ある。また電力方向としては第7図に示すように、順変
換器12の可変直流電圧極性が出力側電圧e、「が(−
)、  (+)となり逆変換器14の入力可変直流電圧
極性が入力電圧q。
As mentioned above, the regenerative operation is a state where the operation is performed with slippage 5--8 on the negative side of the speed characteristic curve shown in FIG. As for the power direction, as shown in FIG. 7, the variable DC voltage polarity of the forward converter 12 is the output side voltage e,
), (+), and the input variable DC voltage polarity of the inverter 14 is the input voltage q.

hが(−)、  (+)となった状態で、電力が3相交
流電源11側にパワーバックされる状態で運転されてい
る。
It is operated in a state where h is (-) and (+), and power is powered back to the three-phase AC power supply 11 side.

この電力方向の極性は第1図に示す極性検出回路31で
検出され、その出力信号eは比較演算回路33に与えら
れる。時刻t。において瞬停が発生した場合、瞬停検出
回路23によりこれが検出され、その出力信号Cが位相
$1]111回路16に印加されて点弧パルス指令はブ
ロックされる。また出力信号Cはタイマ回路30を介し
て遅延され、時刻t1の時点でパルス増巾回路20に与
えられ、これにより点弧パルス指令はブロックされる。
The polarity of this power direction is detected by a polarity detection circuit 31 shown in FIG. 1, and its output signal e is given to a comparison calculation circuit 33. Time t. If an instantaneous power outage occurs, the instantaneous power outage detection circuit 23 detects this, and its output signal C is applied to the phase $1] 111 circuit 16 to block the ignition pulse command. Further, the output signal C is delayed via the timer circuit 30 and is applied to the pulse amplification circuit 20 at time t1, thereby blocking the ignition pulse command.

一方比較演算回路33は電圧検出回路29の出力信号e
 と電源電圧基準e1とから電i電圧の変動をe3を演
算して出力する。この出力信号e3が、周波数基準22
と加算回路34において加算されてリングカウンタ回路
21に与えられると、時刻t。からtlの範囲で逆変換
器14の出力周波数は交流電動!!115の周波数より
上がる。
On the other hand, the comparison calculation circuit 33 receives the output signal e of the voltage detection circuit 29.
The fluctuation of the electric voltage e3 is calculated from the power supply voltage reference e1 and is outputted. This output signal e3 is the frequency reference 22
are added in the adder circuit 34 and provided to the ring counter circuit 21, and then the time t. In the range from tl, the output frequency of the inverter 14 is AC electric! ! The frequency rises above 115.

゛  したがって、第6図に示す速度特性曲線の滑りS
=Aにおいて運転がされるようになる。すなわち滑り周
波数が回生モードからカ行モードの周波数に変化させら
れたことになり、力率曲線すが正側に移行し、第7図に
示す逆変換器14の入力可変直流電圧の極性q、hが(
+)、  (−)と変化する。
゛ Therefore, the slip S of the speed characteristic curve shown in Fig. 6
= Operation starts at A. That is, the slip frequency is changed from the regeneration mode to the power mode frequency, the power factor curve shifts to the positive side, and the polarity q of the input variable DC voltage of the inverter 14 shown in FIG. h is (
+), (-).

この時直流リアクトル13のエネルギを交流電動機15
にもどし、電力方向を2分割して負荷電流を瞬時に零に
させる。この負荷電流を零にする時間、逆変換器14の
点弧パルス指令は位相制御をおこなっており、時刻t1
後にブロックされる。
At this time, the energy of the DC reactor 13 is transferred to the AC motor 15.
Then, the power direction is divided into two and the load current is instantaneously reduced to zero. During the time to make this load current zero, the ignition pulse command of the inverter 14 is phase controlled, and the time t1
later blocked.

この時同時に比較演算回路33の出力信号e3が停止さ
れる。負荷電流が零になれば、順変換器12のサイリス
タ素子がターンオフされるため転流失敗をおこす原因は
除去される。
At the same time, the output signal e3 of the comparison calculation circuit 33 is stopped. When the load current becomes zero, the thyristor element of the forward converter 12 is turned off, thereby eliminating the cause of commutation failure.

第3図は比較演算回路33の詳細構成を示した回路図で
ある。また第4図は第3図の回路動作を説明するための
タイミングチャートである。比較演算回路33は反転増
巾器40、入力抵抗器41、可変抵抗器42、ダイオー
ド43、アナログスイッチ44、オア回路45から構成
されている。極性検出回路31の出力信号eは回生モー
ドから力行モードになる点すなわち時刻t。までは“1
″の状態を保ち、タイマ回路30の出力信号dは時刻t
1まで“1″の状態にある。
FIG. 3 is a circuit diagram showing the detailed configuration of the comparison calculation circuit 33. Further, FIG. 4 is a timing chart for explaining the circuit operation of FIG. 3. The comparison calculation circuit 33 includes an inverting amplifier 40, an input resistor 41, a variable resistor 42, a diode 43, an analog switch 44, and an OR circuit 45. The output signal e of the polarity detection circuit 31 is at the point when the regeneration mode changes to the power running mode, that is, at time t. Until “1”
'' state is maintained, and the output signal d of the timer circuit 30 is at time t.
It remains in the state of "1" up to 1.

この両方の出力信号はオア回路45に与えられ、オア回
路45の出力信号e は時刻t1まで1″の状態が続く
。このオア回路45の出力信号e。
Both output signals are applied to the OR circuit 45, and the output signal e of the OR circuit 45 remains at 1'' until time t1.

がアナログスイッチ44に与えられると、反転増巾器4
0は動作する。入力抵抗器41には電8I電圧基準32
からの負の信号e1と電圧検出回路29からの正の信号
e2とが与えられ、両信号の大小は反転増巾器40で比
較される。
is applied to the analog switch 44, the inverting amplifier 4
0 works. The input resistor 41 has an electric voltage reference 32.
A negative signal e1 from the voltage detection circuit 29 and a positive signal e2 from the voltage detection circuit 29 are applied, and the inverting amplifier 40 compares the magnitude of both signals.

時刻t。以前は電圧検出回路2つの出力信号t2が大で
、しかも正の信号であるため、ダイオード43でクリッ
プされ反転増巾器40の出力信号e3は零の状態である
。時刻t。から時刻t1の間では電源電圧基準32から
の負の信号e、が大となる。そのため反転増巾器40の
出力信号e3は正となり、瞬停時の電源電圧波形が得ら
れる。また可変抵抗器42は反転増巾器40の出力信号
e3の大きざを定めるために用いられ、この出力信号e
3の大きさを調整することによりカ行モードにおける滑
り周波数の大きさを調整することができる。このように
第1図に示すような制御装置を用いることにより、回生
運転中に瞬停が発生しても順変換器側の転流失敗が無く
なり、再運転が可能となる。
Time t. Previously, since the output signals t2 of the two voltage detection circuits were large and positive signals, they were clipped by the diode 43 and the output signal e3 of the inverting amplifier 40 was in a zero state. Time t. From time t1 to time t1, the negative signal e from the power supply voltage reference 32 becomes large. Therefore, the output signal e3 of the inverting amplifier 40 becomes positive, and a power supply voltage waveform at the time of a momentary power failure is obtained. Further, the variable resistor 42 is used to determine the magnitude of the output signal e3 of the inverting amplifier 40.
By adjusting the magnitude of 3, the magnitude of the slip frequency in the power mode can be adjusted. As described above, by using the control device as shown in FIG. 1, even if an instantaneous power failure occurs during regenerative operation, there is no commutation failure on the forward converter side, and restart of operation becomes possible.

なお第1図に示す実施例では電力方向の極性を逆変換器
の入力側に設けた極性検出回路31によりおこなうよう
にしているが、電力方向の極性を位相制御回路16から
検出し、その出力信号を比較演算回路33に与え、瞬停
検出回路23により瞬停を検出するようにしても同様の
動作を行なわせることが可能である。また電圧検出回路
2つの出力信号をリングカウンタ回路21と位相制御回
路16とにそれぞれ印加して、瞬停時に逆変換器14を
位相制御するようにすることも可能である。
In the embodiment shown in FIG. 1, the polarity of the power direction is determined by the polarity detection circuit 31 provided on the input side of the inverter, but the polarity of the power direction is detected by the phase control circuit 16 and its output A similar operation can be performed by applying a signal to the comparison calculation circuit 33 and detecting a momentary power failure by the momentary power failure detection circuit 23. It is also possible to apply the output signals of the two voltage detection circuits to the ring counter circuit 21 and the phase control circuit 16, respectively, to control the phase of the inverter 14 at the time of a momentary power failure.

なおそのさいの順変換器12と逆変換器14のゲートブ
ロックシーケンスは第1図と同様の構成によりおこなわ
れる。
At this time, the gate block sequence of the forward converter 12 and the inverse converter 14 is performed with the same configuration as that shown in FIG.

〔発明の効果〕〔Effect of the invention〕

以上実施例に基づいて詳細に説明したように、本発明に
よれば瞬停発生時にまず順変換器の点弧パルス指令をブ
ロックし、ついで逆変換器の周波数基準を交流電動機の
周波数よりあげて交流電動機の力率をカ行モードにした
のちに、逆変換器の点弧パルス指令をブロックさせるよ
うに構成しているため瞬停時に直流リアクトルに蓄積さ
れたエネルギが速かに放出されるため、復電時に順変換
器が転流失敗をおこすことが無い。したがって、運転の
継続を必要としているボイラ、水道設備のポンプ用途に
使用することができ、信頼性の向上した交流電動機の制
御vit置を提供することができる。
As described above in detail based on the embodiments, according to the present invention, when an instantaneous power failure occurs, the firing pulse command of the forward converter is first blocked, and then the frequency reference of the inverse converter is raised above the frequency of the AC motor. The configuration is such that the ignition pulse command of the inverter is blocked after the power factor of the AC motor is set to power mode, so the energy stored in the DC reactor is quickly released in the event of a momentary power outage. , the forward converter will not cause commutation failure when power is restored. Therefore, it is possible to provide a control device for an AC motor with improved reliability, which can be used for pumps in boilers and water supply facilities that require continuous operation.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示すブロック図、第2図は
第1図の動作を説明するためのタイミングチャート、第
3図は本発明に用いられる比較演算回路の詳細構成を示
す回路図、第4図は第3図の動作を説明するためのタイ
ミングチャート、第5図は従来の制御装置の概略構成を
示すブロック図、第6図は交R電動機の速度特性を示す
図、第7図は制御装置の動作等価回路を示す図である。 11・・・3相交流電源、12・・・順変換器、13・
・・直流リアクトル、14・・・逆変換器、15・・・
交流型vJi、16・・・位相制御回路、20・・・パ
ルス増巾回路、23・・・瞬停検出回路、29・・・電
圧検出回路、30・・・タイマ回路、31・・・極性検
出回路、33・・・比較演算回路、34・・・加算回路
。 出願人代理人  猪  股    清 派 第3図 第4図 ち    t。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of FIG. 1, and FIG. 3 is a circuit showing the detailed configuration of a comparison calculation circuit used in the present invention. 4 is a timing chart for explaining the operation of FIG. 3, FIG. 5 is a block diagram showing a schematic configuration of a conventional control device, FIG. 6 is a diagram showing speed characteristics of an AC R motor, and FIG. FIG. 7 is a diagram showing an operational equivalent circuit of the control device. 11...3-phase AC power supply, 12...Forward converter, 13.
...DC reactor, 14... Inverse converter, 15...
AC type vJi, 16... Phase control circuit, 20... Pulse amplification circuit, 23... Momentary power failure detection circuit, 29... Voltage detection circuit, 30... Timer circuit, 31... Polarity Detection circuit, 33... Comparison calculation circuit, 34... Addition circuit. Applicant's agent Inomata Seiha Figure 3 Figure 4 t.

Claims (1)

【特許請求の範囲】[Claims] 位相制御回路によって制御され一次側が交流電源に接続
された順変換器と、位相差をもつ点弧パルスを発生する
パルス増巾回路によって制御され二次側が交流電動機に
接続された逆変換器とを直流リアクトルを介して結合し
、前記順変換器に入力される前記交流電源の瞬時停止を
検出する瞬停検出回路からの検出信号に応答して前記位
相制御回路と前記パルス増巾回路との制御動作を停止す
るようした交流電動機の制御装置において、前記位相制
御回路の制御動作停止後所定の時間だけ前記交流電動機
をカ行モードとする様前記パルス増巾回路に所定の制御
信号を印加した後前記パルス増巾回路の制御動作を停止
させる手段を設けたことを特徴とする交流電動機の制御
装置。
A forward converter is controlled by a phase control circuit and its primary side is connected to an AC power supply, and an inverse converter is controlled by a pulse amplification circuit that generates firing pulses with a phase difference and its secondary side is connected to an AC motor. Control of the phase control circuit and the pulse amplification circuit in response to a detection signal from an instantaneous power failure detection circuit that is coupled via a DC reactor and that detects an instantaneous stoppage of the AC power supply that is input to the forward converter. In a control device for an AC motor configured to stop operation, after applying a predetermined control signal to the pulse amplification circuit so as to put the AC motor into a power mode for a predetermined period of time after the control operation of the phase control circuit is stopped. A control device for an AC motor, comprising means for stopping the control operation of the pulse amplification circuit.
JP59234649A 1984-11-07 1984-11-07 Controller of ac motor Pending JPS61112595A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59234649A JPS61112595A (en) 1984-11-07 1984-11-07 Controller of ac motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59234649A JPS61112595A (en) 1984-11-07 1984-11-07 Controller of ac motor

Publications (1)

Publication Number Publication Date
JPS61112595A true JPS61112595A (en) 1986-05-30

Family

ID=16974328

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59234649A Pending JPS61112595A (en) 1984-11-07 1984-11-07 Controller of ac motor

Country Status (1)

Country Link
JP (1) JPS61112595A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63264759A (en) * 1986-05-19 1988-11-01 Mitsui Toatsu Chem Inc Electrophotographic sensitive body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63264759A (en) * 1986-05-19 1988-11-01 Mitsui Toatsu Chem Inc Electrophotographic sensitive body

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