JPH026306B2 - - Google Patents
Info
- Publication number
- JPH026306B2 JPH026306B2 JP58019116A JP1911683A JPH026306B2 JP H026306 B2 JPH026306 B2 JP H026306B2 JP 58019116 A JP58019116 A JP 58019116A JP 1911683 A JP1911683 A JP 1911683A JP H026306 B2 JPH026306 B2 JP H026306B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- circuit
- command signal
- voltage
- 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
- 238000001514 detection method Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 101100194362 Schizosaccharomyces pombe (strain 972 / ATCC 24843) res1 gene Proteins 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 230000004913 activation Effects 0.000 description 4
- 101100194363 Schizosaccharomyces pombe (strain 972 / ATCC 24843) res2 gene Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 108010045649 agarase Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Description
【発明の詳細な説明】
本発明は、交流電動機に所定交流を供給する電
力変換装置にかかわり、その電力変換装置への交
流電源に瞬停が発生したときに交流電動機を停止
させることなく速やかに再始動させる電力変換装
置の制御回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power conversion device that supplies a predetermined amount of alternating current to an AC motor. The present invention relates to a control circuit for a power conversion device to be restarted.
従来、この種の回路として第１図に示すものが
あつた。図において、１は、整流器、平滑回路お
よびインバータ等で成る電力変換装置、２は交流
電動機で、交流電動機２は電力変換装置１からの
所定周波数、所定電圧の交流出力によつて運転制
御されるようになされている。また、３は電力変
換装置１からの出力周波数を設定する周波数設定
器、４はこの周波数設定信号に基づき周波数指令
信号を形成して電力変換装置１に送出する周波数
指令回路、５はその周波数指令信号を受け電圧指
令信号を形成して電力変換装置１に送出する電圧
指令回路で、電力変換装置１への供給商用電源が
平常時には、周波数設定器３による設定値に基づ
いた上記周波数指令回路４および電圧指令回路５
の出力信号により電力変換装置１は電力変換を行
ない電動機２に交流出力を供給するようになされ
ている。更に、６は電力変換装置１の交流出力、
および電動機２がフリーランしている時の残留電
圧を変圧する絶縁トランス６ａ、その二次出力を
整流する整流器６ｂ、および整流器６ｂを介した
脈流パルスの個数に基いた周波数検出信号を得、
これに応じた電圧信号を形成する周波数・電圧変
換器６ｃとから成成る周波数検出回路、７は電力
変換装置１への商用電源における瞬停の有無によ
つて上記周波数設定器３または周波数検出回路６
の何れかを選択して周波数指令回路４に接続させ
る切換スイツチ、８は商用電源に瞬停が発生した
場合に切換スイツチ７および電圧指令回路５にリ
セツト信号を送出するリセツト回路で、商用電源
の瞬停時にはリセツト回路８からのリセツト信号
によつて切換スイツチ３を周波数検出回路６側に
接続させると共に電圧指令回路５の出力値を零に
させ、交流電動機１をフリーラン状態にさせるよ
うになされている。なお、Ｒは抵抗、Ｃはコンデ
ンサ、SWは開閉器で、抵抗Ｒおよびコンデンサ
Ｃの直列接続で電圧指令回路５の投入時の立上り
時定数を決めるように、また、コンデンサＣと並
列接続された開閉器SWの開閉により電圧指令回
路５の投入、リセツトを制御するようになされて
いる。 Conventionally, there has been a circuit of this type as shown in FIG. In the figure, 1 is a power conversion device consisting of a rectifier, a smoothing circuit, an inverter, etc., 2 is an AC motor, and the operation of the AC motor 2 is controlled by the AC output of a predetermined frequency and a predetermined voltage from the power conversion device 1. It is done like this. Further, 3 is a frequency setter that sets the output frequency from the power converter 1, 4 is a frequency command circuit that forms a frequency command signal based on this frequency setting signal and sends it to the power converter 1, and 5 is the frequency command. A voltage command circuit that receives a signal, forms a voltage command signal, and sends it to the power converter 1. When the commercial power supply to the power converter 1 is normal, the frequency command circuit 4 generates a voltage command signal based on the set value by the frequency setter 3. and voltage command circuit 5
The power conversion device 1 performs power conversion based on the output signal and supplies an AC output to the electric motor 2. Furthermore, 6 is the AC output of the power converter 1,
and an isolation transformer 6a that transforms the residual voltage when the motor 2 is coasting, a rectifier 6b that rectifies its secondary output, and a frequency detection signal based on the number of pulsating pulses passed through the rectifier 6b.
A frequency detection circuit consisting of a frequency/voltage converter 6c that forms a voltage signal corresponding to this, and 7 is a frequency detection circuit that is connected to the frequency setter 3 or the frequency detection circuit depending on the presence or absence of an instantaneous power failure in the commercial power supply to the power converter 1. 6
8 is a reset circuit that sends a reset signal to the switch 7 and the voltage command circuit 5 when a momentary power failure occurs in the commercial power supply. In the event of a momentary power failure, a reset signal from the reset circuit 8 connects the changeover switch 3 to the frequency detection circuit 6 side, and also causes the output value of the voltage command circuit 5 to become zero, thereby causing the AC motor 1 to coast. ing. In addition, R is a resistor, C is a capacitor, and SW is a switch, which is connected in series with the resistor R and capacitor C to determine the rise time constant when the voltage command circuit 5 is turned on, and is also connected in parallel with the capacitor C. Turning on and resetting of the voltage command circuit 5 is controlled by opening and closing the switch SW.
かかる構成を有する従来回路の動作を各部タイ
ムチヤートたる第２図をも参照して説明する。 The operation of the conventional circuit having such a configuration will be explained with reference to FIG. 2, which is a time chart of each part.
商用電源Vc（第２図ａは実効値を示す）の平常
時には、周波数指令回路４は切換スイツチ７を介
して入力される周波数設定器３からの周波数設定
信号に基づき周波数指令信号fref（第２図ｃ参照）
を電力変換装置１に送出し、また、電圧指令回路
５は、周波数指令信号frefに基づき、出力周波数
と出力電圧との最適な関係（以下、Ｆ／Ｖで表わ
す）を充足する電圧指令信号Vst（第２図ｄ参照）
を電力変換装置１に送出し、しかして、交流電動
機２を運転制御している。 During normal operation of the commercial power supply V c (FIG. 2 a shows the effective value), the frequency command circuit 4 generates a frequency command signal f ref ( (See Figure 2c)
is sent to the power conversion device 1, and the voltage command circuit 5 generates a voltage command signal that satisfies the optimal relationship between the output frequency and the output voltage (hereinafter expressed as F/V) based on the frequency command signal fref . V st (see Figure 2 d)
is sent to the power converter 1, thereby controlling the operation of the AC motor 2.
他方、第２図ａに示すように時刻t1で商用電源
vcに瞬停が生じると、リセツト回路８はその状態
を検出して第２図ｂに示す如くリセツト信号
RES１の状態を変換して切換スイツチ７および
開閉器SWに送出する。その時、切換スイツチ７
は周波数指令回路４と周波数検出器６とを切換接
続させると共に、開閉器SWは閉じて、電圧指令
回路５の出力を零とする。従つて、交流電動機２
は、フリーラン状態となり、その回転数は第２図
Ｃに示す如く徐々に降下する。その後、第２図ａ
に示す時刻t2で瞬停が終了すると、リセツト回路
８は一定時間後の時刻t3でリセツト信号RES１を
再び状態変化させて、切換スイツチ７を周波数設
定器３側に切換えると共に、電圧指令回路５の開
閉器SWを閉じる。この時、周波数指令回路４は
内部のクツシヨン回路によつてソフトスタート方
式に従がう周波数指令信号frefを送出し、電圧指
令回路５は抵抗ＲおよびコンデンサＣの直列回路
による時定数Ｃに従がう電圧指令信号Vstを送出
する。 On the other hand, as shown in Figure 2a, at time t1 , the commercial power supply
When a momentary power failure occurs in v c , the reset circuit 8 detects this state and issues a reset signal as shown in Figure 2b.
The state of RES1 is converted and sent to changeover switch 7 and switch SW. At that time, selector switch 7
The frequency command circuit 4 and the frequency detector 6 are switched and connected, and the switch SW is closed to make the output of the voltage command circuit 5 zero. Therefore, AC motor 2
is in a free run state, and its rotational speed gradually decreases as shown in FIG. 2C. Then, Figure 2a
When the instantaneous power failure ends at time t2 shown in , the reset circuit 8 changes the state of the reset signal RES1 again at time t3 after a certain period of time, switches the changeover switch 7 to the frequency setter 3 side, and also switches the voltage command circuit to the frequency setter 3 side. Close switch SW of 5. At this time, the frequency command circuit 4 sends out a frequency command signal f ref according to the soft start method using an internal cushion circuit, and the voltage command circuit 5 sends out a frequency command signal f ref according to the soft start method, and the voltage command circuit 5 follows a time constant C formed by a series circuit of a resistor R and a capacitor C. Sends the voltage command signal Vst .
このようにして、瞬停発生に拘らず、交流電動
機２の運転を止めることなく再始動するのであ
る。 In this way, regardless of the occurrence of a momentary power failure, the AC motor 2 is restarted without stopping its operation.
しかるに、従来の制御回路では、瞬停後の再始
動時に、電圧指令信号Vstと周波数指令信号frefは
別個独立に上昇し、最適なＦ／Ｖに従がう加速が
できないため、負荷の慣性、容量およびトルク特
性等によつては加速時に交流電動機２に過電流が
流れ、電力変換装置１がストツプするという欠点
があつた。 However, in conventional control circuits, when restarting after an instantaneous power failure, the voltage command signal V st and the frequency command signal f ref rise separately and independently, making it impossible to accelerate according to the optimal F/V. Depending on the inertia, capacity, torque characteristics, etc., an overcurrent flows through the AC motor 2 during acceleration, causing the power converter 1 to stop.
本発明は、叙上の点を鑑みなされたもので、フ
リーラン回転周波数に見合う値まで電圧を徐々に
立ち上げ、その後、周波数と電圧との関係が定常
加速時と同様な最適Ｆ／Ｖになつた時点から所定
の加速パターンに従がい電圧指令信号および周波
数指令信号の値を上昇させる構成とし、極めて安
定な再始動を行ない得る電力変換装置の制御回路
の提供を目的とする。 The present invention was developed in view of the above points, and the voltage is gradually raised to a value corresponding to the free-run rotation frequency, and then the relationship between frequency and voltage reaches the optimum F/V similar to that during steady acceleration. It is an object of the present invention to provide a control circuit for a power conversion device which is configured to increase the values of a voltage command signal and a frequency command signal according to a predetermined acceleration pattern from the time when the power converter is used, and which can perform an extremely stable restart.
しかして、かかる目的を達成すべく、本発明の
制御回路においては、周波数指令信号と電圧指令
信号とを比較してスイツチ作動信号を出力する比
較回路、および、このスイツチ作動信号とリセツ
ト信号を受け、これら信号に基づき瞬停終了後
で、かつ、上記周波数指令信号と上記電圧指令信
号とが所定比になつたとき切換スイツチを周波数
信号設定側に切換えさせる切換指令回路とを設け
たのである。 In order to achieve such an object, the control circuit of the present invention includes a comparison circuit that compares a frequency command signal and a voltage command signal and outputs a switch operation signal, and a comparison circuit that receives the switch operation signal and a reset signal. A switching command circuit is provided which switches the changeover switch to the frequency signal setting side based on these signals after the instantaneous power failure ends and when the frequency command signal and the voltage command signal reach a predetermined ratio.
以下、本発明の一実施例を第１図と同一または
同効の部分には同一符号を附して示す第３図につ
いて説明する。図示実施例において、新たなる回
路９は、電圧指令回路５の入・出力電圧、つま
り、周波数指令信号frefと電圧指令信号Vstとの大
小を比較し、両者が一致したとき“Ｈ”状態のス
イツチ作動信号を出力する比較回路、１０はその
スイツチ作動信号および上述のリセツト信号
RES１の論理和をとり切換指令信号RES２を出
力する切換指令回路たるANDゲートで、瞬停後
再始動時における切換スイツチ７の周波数検出回
路６から周波数設定器３への接続切換えは、切換
指令信号RES２の“Ｌ”から“Ｈ”への状態変
換点で行なわれるようになされている。 Hereinafter, an embodiment of the present invention will be described with reference to FIG. 3, in which parts that are the same as those in FIG. 1 or have the same effect are given the same reference numerals. In the illustrated embodiment, the new circuit 9 compares the input/output voltages of the voltage command circuit 5, that is, the frequency command signal f ref and the voltage command signal V st , and is in the "H" state when the two match. A comparison circuit 10 outputs the switch operation signal of the switch operation signal and the above-mentioned reset signal.
The AND gate is a switching command circuit that takes the logical sum of RES1 and outputs a switching command signal RES2.The switching command signal is used to switch the connection from the frequency detection circuit 6 of the switching switch 7 to the frequency setter 3 when restarting after a momentary power failure. This is done at the state change point of RES2 from "L" to "H".
次に、図示実施例の制御回路における瞬停後の
動作を各部タイムチヤートたる第４図を用いて説
明すると、瞬停終了（時刻t2）後時刻t3までのあ
る一定時間は、第４図ｂに示すリセツト信号
RES１により引き続き電圧指令回路５は、零の
電圧指令信号Vst（第４図ｅ参照）を出力して交流
電動機２のフリーラン状態を継続させると共に、
切換スイツチ７も継続して周波数検出回路６側に
接続され、周波数検出信号に見合つた周波数指令
信号frefが電力変換装置１に送出される。 Next, the operation after a momentary power failure in the control circuit of the illustrated embodiment will be explained using FIG. 4 , which is a time chart of each part . Reset signal shown in Figure b
RES1 causes the voltage command circuit 5 to output a zero voltage command signal V st (see Figure 4 e) to continue the free run state of the AC motor 2, and
The changeover switch 7 is also continuously connected to the frequency detection circuit 6 side, and a frequency command signal f ref corresponding to the frequency detection signal is sent to the power conversion device 1.
図示実施例においては、これ以降、即ち、時刻
t3以降の動作が従来回路と異なつている。リセツ
ト信号RES１が時刻t3で状態を変えると、電圧指
令回路５の開閉器SWは閉じ、電圧指令回路５は
抵抗ＲとコンデンサＣにより定まる時定数に従が
い電圧指令信号Vstを徐々に立ちあがらせ（第４
図ｅ参照）、従つて電力変換装置１の出力電圧も
徐々に立ち上がり交流電動機２のラツシユ電流は
抑制される。しかしながら、リセツト信号RES
１の状態変化に拘らず、切換スイツチ７は周波数
検出回路６に依然として接続されている。 In the illustrated embodiment, from this point on, i.e., the time
The operation after t 3 is different from the conventional circuit. When the reset signal RES1 changes state at time t3 , the switch SW of the voltage command circuit 5 closes, and the voltage command circuit 5 gradually raises the voltage command signal Vst according to the time constant determined by the resistor R and capacitor C. Agarase (4th
(See Figure e) Therefore, the output voltage of the power converter 1 also gradually rises, and the lash current of the AC motor 2 is suppressed. However, the reset signal RES
1, the changeover switch 7 is still connected to the frequency detection circuit 6.
その後、上述の徐々に立ちあがつた電圧指令信
号Vstと周波数指令信号frefが時刻t4で一致すると、
比較回路９はその状況を検出してスイツチ作動信
号をANDゲート１０に送出する。ANDゲート１
０はこのスイツチ作動信号と上述のリセツト信号
RES１との論理和をとり、第４図ｄに示すよう
に時刻t4で切換指令信号RES２の状態を変化さ
せ、しかして、切換スイツチ７は周波数設定器３
側に切換えられる。即ち、回転周波数に見合つた
最適な電圧となつた時刻t4から交流電動機２が再
加速され、この加速は周波数設定器３による周波
数設定信号値まで、定常加速時と同様なＦ／Ｖパ
ターンで行なわれる。 After that, when the voltage command signal V st and the frequency command signal f ref , which gradually rose as described above, coincide at time t 4 ,
Comparison circuit 9 detects the situation and sends a switch activation signal to AND gate 10. AND gate 1
0 is this switch activation signal and the above-mentioned reset signal
RES1 and changes the state of the switching command signal RES2 at time t4 as shown in FIG.
can be switched to the side. That is, the AC motor 2 is re-accelerated from time t4 when the voltage reaches the optimum voltage corresponding to the rotational frequency, and this acceleration continues in the same F/V pattern as during steady acceleration until the frequency setting signal value by the frequency setting device 3 is reached. It is done.
このようにして、交流電動機２は瞬停後再始動
においても速やか、かつ、滑らかに所定の周波数
まで回復することができる。 In this way, the AC motor 2 can quickly and smoothly recover to the predetermined frequency even when restarted after an instantaneous power failure.
なお、上記実施例では、瞬停時の再始動につい
て説明したが、瞬停以外の外乱による電力変換装
置の故障時における再始動にも本発明を適用でき
ることは勿論である。 In the above embodiment, restarting in the event of a momentary power failure has been described, but it goes without saying that the present invention can also be applied to restarting in the event of a failure of the power converter due to a disturbance other than a momentary power failure.
以上のように、本発明の制御回路は、周波数指
令信号と電圧指令信号とを比較し、電圧指令信号
が大きい場合にスイツチ作動信号を出力する比較
回路、および、このスイツチ作動信号とリセツト
信号を受け、これら信号に基づき瞬停終了後で、
かつ、上記周波数指令信号と上記電圧指令信号と
が所定比になつたとき切換スイツチを周波数信号
設定側に切換えさせる切換指令回路とを設け、瞬
停後再始動時には、先ず、電圧指令信号を立ち上
げさせ、その後、電圧指令信号と周波数指令信号
とが最適な関係になつた時点から所定パターンに
従がう加速を行なわせる構成としたので、交流電
動機に過電流が流れることなく、速やか、かつ、
安定した再始動を行なうことができるという効果
を有する。 As described above, the control circuit of the present invention includes a comparison circuit that compares a frequency command signal and a voltage command signal and outputs a switch activation signal when the voltage command signal is large, and a comparison circuit that outputs a switch activation signal when the voltage command signal is large. Based on these signals, after the momentary power outage ends,
Further, a switching command circuit is provided which switches a changeover switch to the frequency signal setting side when the frequency command signal and the voltage command signal reach a predetermined ratio, and when restarting after a momentary power failure, first the voltage command signal is turned off. The configuration is such that acceleration is performed according to a predetermined pattern from the point at which the voltage command signal and frequency command signal reach an optimal relationship, so that the AC motor can be quickly and efficiently controlled without overcurrent flowing. ,
This has the effect that stable restart can be performed.
第１図は従来の電力変換装置の制御回路の構成
を示すブロツク図、第２図は第１図回路における
各部タイムチヤート、第３図は本発明の一実施例
による電力変換装置の制御回路の構成を示すブロ
ツク図、第４図は第３図回路における各部タイム
チヤートである。
１：電力変換装置、２：交流電動機、３：周波
数設定器、４：周波数指令回路、５：電圧指令回
路、６：周波数検出回路、７：切換スイツチ、
８：リセツト回路、９：比較回路、１０：切換指
令回路（ANDゲート）。なお、図中、同一符号は
同一または相当部分を示す。
FIG. 1 is a block diagram showing the configuration of a control circuit of a conventional power converter, FIG. 2 is a time chart of each part in the circuit of FIG. 1, and FIG. 3 is a diagram of a control circuit of a power converter according to an embodiment of the present invention. A block diagram showing the configuration, and FIG. 4 are time charts of each part in the circuit of FIG. 3. 1: Power converter, 2: AC motor, 3: Frequency setting device, 4: Frequency command circuit, 5: Voltage command circuit, 6: Frequency detection circuit, 7: Changeover switch,
8: Reset circuit, 9: Comparison circuit, 10: Switching command circuit (AND gate). In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
号に基づき所定周波数電圧の交流に変換して交流
電動機に供給する電力変換装置、交流電動機のフ
リーラン時その残留電圧より回転周波数を検出す
る周波数検出回路、電力変換装置の出力周波数を
設定する周波数設定器、周波数検出信号または周
波数設定信号の何れかを出力させるべく切換える
切換スイツチ、その切換えに応じて入力される信
号に基づき上記周波数指令信号を形成して出力す
る周波数指令回路、この周波数指令信号に基づき
上記電圧指令信号を形成して出力する電圧指令回
路、上記交流電源が停電したときには、上記切換
スイツチを切換え制御し、周波数検出信号を周波
数指令回路へ切換えるとともに、上記電圧指令回
路よりの電圧指令信号出力を停止させ、且つ、復
電後の一定時間経過後には上記電圧指令信号を再
出力させるリセツト信号を出力するリセツト回路
と、再出力された電圧指令信号と上記周波数指令
信号とを比較し、一致判定時に一致信号を出力す
る比較回路、該一致信号に基づき上記切換スイツ
チを周波数設定信号側に切換える切換指令回路と
を設けたことを特徴とする電力変換装置の制御回
路。1. A power conversion device that converts AC power into AC of a predetermined frequency voltage based on a frequency command signal and a voltage command signal and supplies it to an AC motor, a frequency detection circuit that detects the rotation frequency from the residual voltage when the AC motor is free running; A frequency setter that sets the output frequency of the power converter, a changeover switch that changes to output either a frequency detection signal or a frequency setting signal, and a changeover switch that forms the frequency command signal based on the signal input in response to the changeover. A frequency command circuit that outputs a frequency command signal, a voltage command circuit that forms and outputs the voltage command signal based on this frequency command signal, and when the AC power supply fails, the changeover switch is controlled to switch and the frequency detection signal is sent to the frequency command circuit. a reset circuit that outputs a reset signal that stops outputting the voltage command signal from the voltage command circuit and re-outputs the voltage command signal after a certain period of time after power is restored; A comparison circuit that compares the command signal and the frequency command signal and outputs a match signal when determining a match, and a switching command circuit that switches the changeover switch to the frequency setting signal side based on the match signal. Control circuit for power conversion equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58019116A JPS59148585A (en) | 1983-02-08 | 1983-02-08 | Control circuit for power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58019116A JPS59148585A (en) | 1983-02-08 | 1983-02-08 | Control circuit for power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59148585A JPS59148585A (en) | 1984-08-25 |
| JPH026306B2 true JPH026306B2 (en) | 1990-02-08 |
Family
ID=11990501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58019116A Granted JPS59148585A (en) | 1983-02-08 | 1983-02-08 | Control circuit for power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59148585A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61196794A (en) * | 1985-02-21 | 1986-08-30 | Nippon Electric Ind Co Ltd | Inverter for driving ac motor countermeasured for power interruption and recovery times |
| JPH0448156Y2 (en) * | 1985-04-18 | 1992-11-12 | ||
| JPS6260499A (en) * | 1985-09-10 | 1987-03-17 | Toshiba Corp | Inverter device |
| JP2629692B2 (en) * | 1987-02-23 | 1997-07-09 | 富士電機株式会社 | How to restart the load motor at the moment of power failure of the inverter |
| JP2562564B2 (en) * | 1994-05-12 | 1996-12-11 | 株式会社日立製作所 | Induction motor operation control method and apparatus |
| JP2562563B2 (en) * | 1994-05-12 | 1996-12-11 | 株式会社日立製作所 | Induction motor operation control method |
| JPH07274587A (en) * | 1995-04-27 | 1995-10-20 | Hitachi Ltd | Control method for induction motor operation |
| JP2017139904A (en) * | 2016-02-04 | 2017-08-10 | 三浦工業株式会社 | Boiler |
| CN116057828A (en) * | 2020-08-03 | 2023-05-02 | 株式会社电装 | Motor control device |
-
1983
- 1983-02-08 JP JP58019116A patent/JPS59148585A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59148585A (en) | 1984-08-25 |
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