JPH0775382A - Method and device for controlling operation of induction electric motor - Google Patents
Method and device for controlling operation of induction electric motorInfo
- Publication number
- JPH0775382A JPH0775382A JP6098689A JP9868994A JPH0775382A JP H0775382 A JPH0775382 A JP H0775382A JP 6098689 A JP6098689 A JP 6098689A JP 9868994 A JP9868994 A JP 9868994A JP H0775382 A JPH0775382 A JP H0775382A
- Authority
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- Japan
- Prior art keywords
- induction motor
- power
- frequency
- residual voltage
- electric motor
- 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.)
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- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は誘導電動機の運転制御方
法及びその装置に係り、特に、電力の供給が中断した後
の誘導電動機の再起動に好適な誘導電動機の運転制御方
法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction motor operation control method and apparatus, and more particularly to an induction motor operation control method and apparatus suitable for restarting the induction motor after power supply is interrupted. .
【０００２】[0002]
【従来の技術】誘導電動機の運転中に発生した電源瞬停
後の運転再開を、誘導電動機の再起動と云う。従来の再
起動方法に、特開昭５４−５０８１２号公報及び特開昭
５５−８２５０号公報記載のものがある。2. Description of the Related Art Resumption of operation after a momentary power failure during operation of an induction motor is called restart of the induction motor. Conventional restart methods include those described in JP-A-54-50812 and JP-A-55-8250.
【０００３】この従来の再起動方法を以下に述べる。電
源瞬停が発生すると、誘導電動機の回転数は慣性に従っ
て減少する。この回転数の減少は、誘導電動機の残留電
圧として反映される。従って、この残留電圧を監視して
おき、電源回復後、所定の回転数になるように電源制御
を行って再起動を行う。This conventional restart method will be described below. When a power failure occurs, the rotation speed of the induction motor decreases according to inertia. This decrease in rotation speed is reflected as the residual voltage of the induction motor. Therefore, the residual voltage is monitored, and after the power is restored, the power is controlled so that the rotation speed becomes a predetermined value, and the restart is performed.
【０００４】この従来の再起動方法は、回転数の監視を
速度発電機を用いずに可能とした点に利点がある。This conventional restart method is advantageous in that the number of revolutions can be monitored without using a speed generator.
【０００５】然るに、瞬停であるにもかかわらず、且つ
回転数が零になっていないにもかかわらず、残留電圧が
零になってしまうことがある。これは主として負荷の影
響によるものと考えられる。以下、考察する。However, the residual voltage may become zero despite the instantaneous blackout and the number of revolutions not having become zero. This is considered to be mainly due to the influence of load. Consider below.
【０００６】誘導電動機の一次側を開放（即ち電源断と
等価）した場合、その端子には電圧が残留する。この残
留電圧ｖ1は、When the primary side of the induction motor is opened (that is, equivalent to the power supply being cut off), the voltage remains at the terminal. This residual voltage v 1 is
【０００７】[0007]
【数１】 [Equation 1]
【０００８】ここで、 Ｍ：一次と二次間の相互インダクタンス Ｔ2＝Ｌ2／ｒ2：二次時定数 ω：回転子角速度 ｉ20：二次電流の第２種初期値 である。Here, M: mutual inductance between primary and secondary T 2 = L 2 / r 2 : secondary time constant ω: rotor angular velocity i 20 : second type initial value of secondary current.
【０００９】上記の数１で、回転子角速度ωが急激に下
降しないという条件下（負荷：小、ＧＤ2：大）では、In the above condition (1), under the condition that the rotor angular velocity ω does not drop sharply (load: small, GD 2 : large),
【００１０】[0010]
【数２】 [Equation 2]
【００１１】となる。この時の残留電圧の波形を図１
（イ）に示す。この図は減衰振動波形図であり、その周
期は、二次時定数Ｔ2に大きく依存し、ほぼ等周期で減
衰してゆく。[0011] Figure 1 shows the waveform of the residual voltage at this time.
Shown in (a). This diagram is a damped oscillation waveform diagram, the period of which largely depends on the second-order time constant T 2 and is damped in almost equal periods.
【００１２】一方、回転子角速度が急激に下降するとい
う条件（負荷：大、ＧＤ2：小）のものとでは、残留電
圧ｖ1は、On the other hand, under the condition that the rotor angular velocity drops sharply (load: large, GD 2 : small), the residual voltage v 1 is
【００１３】[0013]
【数３】 [Equation 3]
【００１４】となる。この時の波形は図１（ロ）とな
る。即ち、周期も振幅も急激に変化する。[0014] The waveform at this time is shown in FIG. That is, both the cycle and the amplitude change rapidly.
【００１５】[0015]
【発明が解決しようとする課題】残留電圧は負荷の条件
（負荷、ＧＤ2の大小）に大きく依存する。このため仮
に負荷が小さく、ＧＤ2が大きい場合でも、二次時定数
が短ければ、瞬停の時間によっては残留電圧を検出する
ことは不可能となる。このような状態（回転角周波数不
明）で、電源を構成する電力変換装置をオンすれば、過
大電流が流れたり、回生状態となり変換装置が過電流あ
るいは過電圧保護による出力遮断を行い、制御不能とな
る。このため、残留電圧無のときにいきなり電力変換装
置をオンすることはできない。The residual voltage greatly depends on the load conditions (the load and the magnitude of GD 2 ). Therefore, even if the load is small and GD 2 is large, if the secondary time constant is short, it will be impossible to detect the residual voltage depending on the time of the instantaneous blackout. In such a state (rotational angular frequency unknown), if the power converter that constitutes the power supply is turned on, an excessive current flows or a regenerative condition occurs, and the converter shuts off the output due to overcurrent or overvoltage protection, resulting in loss of control. Become. Therefore, the power converter cannot be turned on suddenly when there is no residual voltage.
【００１６】また、負荷が大きく、ＧＤ2が小さい場合
には、図１（ロ）に示したように急激な減衰をするた
め、瞬停の時間幅によっては、残留電圧を検出すること
ができないことになる。この結果、前述と同様な問題が
生ずる。Further, when the load is large and GD 2 is small, the residual voltage cannot be detected depending on the time width of the instantaneous blackout because of the rapid attenuation as shown in FIG. It will be. As a result, the same problem as described above occurs.
【００１７】本発明の目的は、残留電圧がない場合で
も、誘導電動機を円滑に再起動することのできる誘導電
動機の運転制御方法を提供することにある。An object of the present invention is to provide an operation control method for an induction motor, which can smoothly restart the induction motor even when there is no residual voltage.
【００１８】[0018]
【課題を解決するための手段】上記目的は、誘導電動機
の運転中に電源瞬停が生じた後に、該誘導電動機の再起
動を行う場合、電源瞬停後に復電された際に、残留電圧
が無しと判断された場合には該誘導電動機に交流電力を
印加し、この印加の後に該誘導電動機への交流電力を遮
断し、この遮断の後に前記誘導電動機の一次側端子に発
生する残留電圧の周波数を検出し、この検出した周波数
に応じて再起動を行うことで、達成される。Means for Solving the Problems The above-mentioned object is to provide a residual voltage when the induction motor is restarted after a momentary power failure during operation of the induction motor and when the power is restored after the momentary power failure. If it is determined that the induction motor is not present, AC power is applied to the induction motor, the AC power to the induction motor is cut off after the application, and the residual voltage generated at the primary side terminal of the induction motor after the cutoff. This is achieved by detecting the frequency of and restarting according to the detected frequency.
【００１９】[0019]
【作用】再励磁を交流電力で行うため、誘導電動機の一
次巻線が直流偏磁することなく再起動ができ、また、残
留電圧を検出するために直流分をカットする必要が無い
ので、広い速度範囲で実速度にあった周波数から再起動
できる。Since the re-excitation is performed by AC power, the primary winding of the induction motor can be restarted without DC bias magnetization, and since it is not necessary to cut the DC component to detect the residual voltage, it is wide. It is possible to restart from the frequency that matches the actual speed in the speed range.
【００２０】[0020]
【実施例】以下、本発明の一実施例を図面を参照して説
明する。図２は、本発明の一実施例に係る運転制御装置
の構成図であり、図３はその動作処理手順を示すフロー
チャート、図４は動作タイムチャートである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 2 is a configuration diagram of an operation control device according to an embodiment of the present invention, FIG. 3 is a flowchart showing the operation processing procedure, and FIG. 4 is an operation time chart.
【００２１】図２において、順変換器１は、交流３相電
源を取込み整流を行う。逆変換器２は、順変換器１の出
力（平滑コンデンサ４を介して）を取込み交流変換を行
う。逆変換器２の点弧角制御は主スイッチング素子駆動
回路１５が行う。順変換器１と逆変換器２とは電源の一
部を構成する電力変換装置である。逆変換器２の出力が
誘導電動機３を駆動回転させる。In FIG. 2, the forward converter 1 takes in an AC three-phase power source and performs rectification. The inverse converter 2 takes in the output of the forward converter 1 (via the smoothing capacitor 4) and performs AC conversion. The main switching element drive circuit 15 controls the firing angle of the inverse converter 2. The forward converter 1 and the inverse converter 2 are power conversion devices that form a part of a power supply. The output of the inverse converter 2 drives and rotates the induction motor 3.
【００２２】制御回路１４は、主スイッチング素子駆動
回路１５の点弧角制御のための指令回路であり、主スイ
ッチング素子駆動回路１５はこの指令を受けて必要なサ
イリスタへ必要な点弧パルスを送出し、点弧駆動させ
る。The control circuit 14 is a command circuit for controlling the ignition angle of the main switching element drive circuit 15, and the main switching element drive circuit 15 receives this command and sends out the necessary ignition pulse to the necessary thyristor. And drive the ignition.
【００２３】以上の構成は、誘導電動機制御の一般的系
統である。The above configuration is a general system for controlling an induction motor.
【００２４】本実施例で採用した構成要素は以下とな
る。The components adopted in this embodiment are as follows.
【００２５】瞬停検出回路１３は、制御用トランス１２
を介して交流３相電源が瞬停したか否かを検出する。ト
ランス５は、誘導電動機３の一次側残留電圧取込み用の
トランスであり、残留電圧は残留電圧検出回路６が行
う。The instantaneous blackout detection circuit 13 includes a control transformer 12
It is detected whether the AC three-phase power supply has momentarily stopped via. The transformer 5 is a transformer for taking in the primary side residual voltage of the induction motor 3, and the residual voltage detection circuit 6 performs the residual voltage.
【００２６】周波数検出回路７は、残留電圧検出回路６
の検出残留電圧を取込み対応する周波数の算出を行う。
この算出周波数は、誘導電動機３の現在の周波数であ
る。The frequency detection circuit 7 is a residual voltage detection circuit 6
The detected residual voltage of is taken and the corresponding frequency is calculated.
This calculated frequency is the current frequency of the induction motor 3.
【００２７】周波数設定回路８は、算出回路７で算出し
た誘導電動機の回転周波数に逆変換器２の出力周波数を
可及的に一致させる。The frequency setting circuit 8 matches the output frequency of the inverse converter 2 with the rotation frequency of the induction motor calculated by the calculation circuit 7 as much as possible.
【００２８】ソフトスタート回路９は、誘導電動機３を
再起動する際、電力変換装置に過電流等が発生しないよ
うに出力電圧を所定値から徐々に増加させるための出力
電圧のソフトスタートを行う。When the induction motor 3 is restarted, the soft start circuit 9 soft-starts the output voltage for gradually increasing the output voltage from a predetermined value so that an overcurrent or the like does not occur in the power converter.
【００２９】再励磁指令回路１０は、残留電圧検出回路
６で検出した残留電圧が所定値以下の場合、あるいは残
留電圧により検出した周期が所定以上の場合、再励磁の
指令を行う。The re-excitation command circuit 10 issues a re-excitation command when the residual voltage detected by the residual voltage detection circuit 6 is less than a predetermined value or when the period detected by the residual voltage is more than a predetermined value.
【００３０】残留電圧再誘起指令回路１１は、誘導電動
機に所定出力電圧、所定周波数を所定時間印加し、残留
電圧を再誘起させるべく指令を行う。この指令先は、制
御回路１４である。The residual voltage re-induction command circuit 11 applies a predetermined output voltage and a predetermined frequency to the induction motor for a predetermined time to issue a command to re-induce the residual voltage. The command destination is the control circuit 14.
【００３１】次に、図３，図４をもとに動作の流れを説
明する。Next, the flow of operation will be described with reference to FIGS.
【００３２】瞬停発生前の定常運転下では、回路６、
７、８、９、１０、１１、１３は作動しない。従って、
制御回路１４の指令のもとに主スイッチング素子駆動回
路１５から逆変換器２のスイッチング制御を行い、定常
運転を行う。Under normal operation before the occurrence of the instantaneous blackout, the circuit 6,
7,8,9,10,11,13 do not work. Therefore,
Based on a command from the control circuit 14, the main switching element drive circuit 15 controls the switching of the inverse converter 2 to perform a steady operation.
【００３３】瞬停が発生すると、検出回路１３がこれを
検出し、制御回路１４に知らせる。制御回路１４は、こ
の知らせににより交流３相電源の印加がなくなったこと
を知り、逆変換器２に対する駆動回路１５の出力を遮断
させる。When an instantaneous blackout occurs, the detection circuit 13 detects it and notifies the control circuit 14 of it. The control circuit 14 knows from this notification that the application of the AC three-phase power supply has stopped, and cuts off the output of the drive circuit 15 to the inverse converter 2.
【００３４】瞬停発生から若干の時間遅れ（τ1）を経
て、誘導電動機３の回転数は、低下し始める（Ｂ）。回
転数の低下に伴って残留電圧も低下し始める（Ｃ）。こ
の低下は、減衰振動特性となる。After a slight time delay (τ 1 ) from the occurrence of the instantaneous power failure, the rotation speed of the induction motor 3 starts to decrease (B). The residual voltage also starts to decrease as the rotation speed decreases (C). This decrease becomes a damping vibration characteristic.
【００３５】瞬停回復時に残留電圧が存在していれば、
回路６、７、８、９を通じて再起動を行う。即ち、周波
数算出、周波数設定を行い、ソフトスタートさせる。If the residual voltage exists at the momentary power recovery,
Reboot is performed through the circuits 6, 7, 8 and 9. That is, frequency calculation and frequency setting are performed, and a soft start is performed.
【００３６】かかる瞬停回復時に残留電圧の存在する場
合については、図４のタイムチャートでは開示していな
い。The case where the residual voltage exists at the time of recovery from the instantaneous power failure is not disclosed in the time chart of FIG.
【００３７】さて、瞬停回復時に残留電圧が存在せず零
になっている（Ｃ）と、回路１０，１１が作動し、誘導
電動機３を所定の条件で運転させる。所定の条件とは、
先ず出力遮断の解除を行い、所定電圧、所定周波数にな
るように運転させることである。この運転は、零になっ
た残留電圧を再び生じさせる目的のためである。この運
転継続区間は、τ2である（Ｄ）。一定時間τ2経過後、
再び出力遮断を行い、更に一定時間τ3を経過させる。
然る後、残留電圧を検出し、零でなければ回路６、７、
８、９を介して周波数設定のもとに出力電圧しぼりによ
るソフトスタートを行う。図２でＥは出力周波数指令、
Ｆは出力電圧指定である。Now, when the residual voltage does not exist and is zero at the time of recovery from the instantaneous power failure (C), the circuits 10 and 11 are activated and the induction motor 3 is operated under a predetermined condition. The predetermined condition is
First, the output cutoff is released, and the operation is performed so that the voltage becomes a predetermined voltage and a predetermined frequency. This operation is for the purpose of regenerating the residual voltage which has become zero. This operation continuation section is τ 2 (D). After a certain time τ 2 ,
The output is cut off again and τ3 is allowed to elapse for a certain period of time.
After that, the residual voltage is detected, and if it is not zero, the circuits 6, 7,
A soft start is performed by narrowing the output voltage based on the frequency setting via 8 and 9. In FIG. 2, E is an output frequency command,
F is an output voltage designation.
【００３８】ソフトスタート後、任意の時刻でＶ／ｆ一
致となり、以降、規定の回転数となるように制御回路１
４が制御を行う。After the soft start, the V / f coincides at an arbitrary time, and thereafter, the control circuit 1 is controlled so that the rotation speed becomes a prescribed rotation speed.
4 controls.
【００３９】尚、再励磁を行っても、残留電圧が零であ
れば、誘導電動機停止と判断し、零ソフトスタートを行
う。Even if re-excitation is performed, if the residual voltage is zero, it is determined that the induction motor is stopped, and a zero soft start is performed.
【００４０】本実施例によれば、瞬停回復時に残留電圧
が零になっても、再励磁する操作を行うので、これによ
って発生する残留電圧をもとにその時の回転数を算出で
きる。この算出回転数をもとに再起動運転を行うので、
負荷の条件に関係なく、円滑に誘導電動機の自動再起動
が実行できる。According to this embodiment, the re-excitation operation is performed even if the residual voltage becomes zero at the time of recovery from the instantaneous blackout, so that the rotational speed at that time can be calculated based on the residual voltage generated thereby. Since restart operation is performed based on this calculated rotation speed,
The automatic restart of the induction motor can be smoothly executed regardless of the load condition.
【００４１】尚、再励磁の条件として残留電圧を零とし
たが、検出精度の関係から零である必要はない。回路
６、７、８、９、１０、１１、１３、１４は、マイコン
におきかえることも可能である。Although the residual voltage is set to zero as a re-excitation condition, it does not have to be zero in view of detection accuracy. The circuits 6, 7, 8, 9, 10, 11, 13, 14 can be replaced by microcomputers.
【００４２】更に、瞬停と同様な状態となる場合にも適
用できる。例えば、商用電源から電力変換装置へ切換え
る場合にも適用できる。更に、残留電圧の振幅値と共に
位相を検出し、同期投入（再起動）も可能である。Furthermore, the present invention can be applied to the case where a state similar to an instantaneous blackout occurs. For example, it can be applied when switching from a commercial power source to a power conversion device. Further, the phase can be detected together with the amplitude value of the residual voltage, and the synchronization can be turned on (restart).
【００４３】[0043]
【発明の効果】本発明によれば、電力変換装置の電源が
瞬停の場合、あるいは商用電源から電力変換装置へ切換
える場合に負荷の条件等によらず、迅速且つ円滑に誘導
電動機を自動再起動することができる。According to the present invention, when the power source of the power converter is instantaneously interrupted, or when the commercial power source is switched to the power converter, the induction motor is automatically restarted smoothly regardless of load conditions. Can be activated.
【図１】残留電圧の説明図である。FIG. 1 is an explanatory diagram of a residual voltage.
【図２】本発明の一実施例に係る運転制御装置の構成図
である。FIG. 2 is a configuration diagram of an operation control device according to an embodiment of the present invention.
【図３】図２に示す運転制御装置の動作手順を示すフロ
ーチャートである。3 is a flowchart showing an operation procedure of the operation control device shown in FIG.
【図４】図２に示す運転制御装置の動作を示すタイムチ
ャートである。FIG. 4 is a time chart showing the operation of the operation control device shown in FIG.
１…順変換器、２…逆変換器、３…誘導電動機、４…平
滑コンデンサ、５…電圧検出トランス、６…残留電圧検
出回路、７…周波数検出回路、８…周波数設定回路、９
…出力電力ソフトスタート回路、１０…再励磁指令回
路、１１…指令回路、１２…制御用トランス、１３…瞬
停検出回路、１４…制御回路、１５…主スイッチング素
子駆動回路。DESCRIPTION OF SYMBOLS 1 ... Forward converter, 2 ... Inverse converter, 3 ... Induction motor, 4 ... Smoothing capacitor, 5 ... Voltage detection transformer, 6 ... Residual voltage detection circuit, 7 ... Frequency detection circuit, 8 ... Frequency setting circuit, 9
Output power soft start circuit, 10 ... Re-excitation command circuit, 11 ... Command circuit, 12 ... Control transformer, 13 ... Instantaneous power failure detection circuit, 14 ... Control circuit, 15 ... Main switching element drive circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藪 雅智 千葉県習志野市東習志野七丁目１番１号 日立京葉エンジニアリング株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatomo Yabu 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Keiyo Engineering Co., Ltd.
Claims (2)
後に、該誘導電動機の再起動を行う誘導電動機の運転制
御方法において、 Ａ）電源瞬停後に復電された際に、残留電圧が無しと判
断された場合には該誘導電動機に交流電力を印加する工
程と、 Ｂ）上記Ａ）の工程によって誘導電動機に交流電力を印
加した後に、該誘導電動機への交流電力が遮断される工
程と、 Ｃ）上記Ｂ）の工程の後に前記誘導電動機の一次側端子
に発生する残留電圧の周波数を検出する工程と、 Ｄ）上記Ｃ）の工程において検出した周波数に応じて再
起動を行う工程 とを備えたことを特徴とする誘導電動機の運転制御方
法。1. An operation control method for an induction motor, which restarts the induction motor after a power interruption occurs during operation of the induction motor, comprising: A) residual voltage when power is restored after the power interruption. If it is determined that the induction motor is not present, the step of applying AC power to the induction motor, and B) the AC power to the induction motor is cut off after applying the AC power to the induction motor in the step A). And C) a step of detecting the frequency of the residual voltage generated at the primary side terminal of the induction motor after the step of B), and D) restarting in accordance with the frequency detected in the step of C). An operation control method for an induction motor, comprising:
波数の交流電力に変換して誘導電動機に供給するための
電力変換手段と、前記電力変換手段が前記誘導電動機に
出力する交流電力の周波数を制御する制御手段を備える
誘導電動機の運転制御装置において、 電源瞬停後に受電電力が復電した際に前記誘導電動機の
一次側に現れる残留電圧が無いときは前記制御手段に指
令を出力して前記誘導電動機に交流電力を一時的に供給
する再励磁指令手段と、前記再励磁指令から所定時間経
過した時の前記誘導電動機の一次側周波数を前記制御手
段に出力する再起動周波数設定手段とを備え、前記制御
手段は、前記再起動周波数設定手段で設定された周波数
から予め設定された周波数まで前記電力変換手段の出力
周波数を変化させて前記誘導電動機を再起動する手段を
備えたことを特徴とする誘導電動機の運転制御装置。2. A power conversion unit for receiving AC power, converting the received power into AC power of an arbitrary frequency and supplying the AC power to an induction motor, and AC power output by the power conversion unit to the induction motor. In an induction motor operation control device having a control means for controlling the frequency, when there is no residual voltage that appears on the primary side of the induction motor when the received power is restored after a momentary power failure, a command is output to the control means. Re-excitation command means for temporarily supplying AC power to the induction motor, and restart frequency setting means for outputting the primary side frequency of the induction motor when a predetermined time has elapsed from the re-excitation command to the control means. The control means changes the output frequency of the power conversion means from the frequency set by the restart frequency setting means to a preset frequency, and the induction motor Operation controller for an induction motor characterized by comprising means for restarting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6098689A JP2562564B2 (en) | 1994-05-12 | 1994-05-12 | Induction motor operation control method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6098689A JP2562564B2 (en) | 1994-05-12 | 1994-05-12 | Induction motor operation control method and apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59190514A Division JPH07110154B2 (en) | 1984-09-13 | 1984-09-13 | Induction motor operation control method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0775382A true JPH0775382A (en) | 1995-03-17 |
| JP2562564B2 JP2562564B2 (en) | 1996-12-11 |
Family
ID=14226483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6098689A Expired - Lifetime JP2562564B2 (en) | 1994-05-12 | 1994-05-12 | Induction motor operation control method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2562564B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007185090A (en) * | 2006-01-03 | 2007-07-19 | Taida Electronic Ind Co Ltd | Fan system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57208888A (en) * | 1981-06-17 | 1982-12-22 | Toshiba Corp | Speed detecting system for induction motor |
| JPS58130790A (en) * | 1982-01-27 | 1983-08-04 | Hitachi Ltd | Drive device for motor |
| JPS59148585A (en) * | 1983-02-08 | 1984-08-25 | Mitsubishi Electric Corp | Control circuit for power converter |
| JPS59201697A (en) * | 1983-04-27 | 1984-11-15 | Toshiba Corp | Synchronization changer |
| JPH0698688A (en) * | 1992-09-24 | 1994-04-12 | Shinkiyou Sangyo Kk | Feed |
-
1994
- 1994-05-12 JP JP6098689A patent/JP2562564B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57208888A (en) * | 1981-06-17 | 1982-12-22 | Toshiba Corp | Speed detecting system for induction motor |
| JPS58130790A (en) * | 1982-01-27 | 1983-08-04 | Hitachi Ltd | Drive device for motor |
| JPS59148585A (en) * | 1983-02-08 | 1984-08-25 | Mitsubishi Electric Corp | Control circuit for power converter |
| JPS59201697A (en) * | 1983-04-27 | 1984-11-15 | Toshiba Corp | Synchronization changer |
| JPH0698688A (en) * | 1992-09-24 | 1994-04-12 | Shinkiyou Sangyo Kk | Feed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007185090A (en) * | 2006-01-03 | 2007-07-19 | Taida Electronic Ind Co Ltd | Fan system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2562564B2 (en) | 1996-12-11 |
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