JPH03139196A - Suppression of current ripple in inverter - Google Patents
Suppression of current ripple in inverterInfo
- Publication number
- JPH03139196A JPH03139196A JP1277701A JP27770189A JPH03139196A JP H03139196 A JPH03139196 A JP H03139196A JP 1277701 A JP1277701 A JP 1277701A JP 27770189 A JP27770189 A JP 27770189A JP H03139196 A JPH03139196 A JP H03139196A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- inverter
- ripple
- output
- circuit
- 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
- 230000001629 suppression Effects 0.000 title 1
- 230000003247 decreasing effect Effects 0.000 claims abstract 2
- 230000010349 pulsation Effects 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 8
- 238000009499 grossing Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Landscapes
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は交流電動機駆動用の汎用電圧形インバータの出
力電流脈動の抑制方法間する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for suppressing output current pulsations of a general-purpose voltage source inverter for driving an AC motor.
従来のこの種の汎用電圧形インバータにおいては、その
出力電流すなわちその駆動交流電動機の入力電流におけ
る脈動発生時に該電流脈動を抑制するための補償回路を
設けることは、その価格上の制約から一般的には行われ
ていなかった。In conventional general-purpose voltage source inverters of this type, it is common practice to provide a compensation circuit to suppress current pulsations when pulsations occur in the output current, that is, the input current of the driving AC motor, due to price constraints. It had not been done.
しかしながら上記の如き従来の汎用電圧形インバータに
おいては、その負荷となる交流電動機の通電電流脈動発
生時には前記インバータの主回路におけるスイッチング
素子に対するスイッチング周波数を低減させるか或いは
該インバータの出力電圧調整による前記交流電動機の励
磁条件変更を行っていたが、この場合には前記電動機通
電電流におけるリフプル分の増大成いは前記交流電動機
における過励磁発生の恐れがあり、安定した所要の電動
機運転の継続が不能となる可能性があった。However, in the conventional general-purpose voltage source inverter as described above, when pulsating current occurs in the AC motor serving as the load, the switching frequency of the switching element in the main circuit of the inverter is reduced or the output voltage of the inverter is adjusted to reduce the AC current. The excitation conditions of the motor were changed, but in this case, an increase in the ripple component in the motor current may cause overexcitation in the AC motor, making it impossible to continue stable motor operation as required. There was a possibility that it would happen.
上記に鑑み本発明は、広範囲の交流電動機を対象とし簡
易且つ安価に該電動機の通電電流すなわち前記インバー
タの出力電流における脈動を抑制する方法の提供を目的
とするものである。In view of the above, it is an object of the present invention to provide a method for simply and inexpensively suppressing pulsations in the current flowing through a wide range of AC motors, that is, in the output current of the inverter.
［課題を解決するための手段］
上記目的を達成するために、本発明のインバータの電流
脈動抑制方法は、交流電動機を駆動する電圧形インバー
タにおいて、該インバータの直流中間回路電圧を入力と
し該入力電圧の比例電圧と該インバータの制御用定圧直
流電圧とを出力するＤ Ｃ／Ｄ Ｃコンバータと、該コ
ンバータの出力する前記比例電圧を入力とし該比例電圧
に重畳したリップル交流電圧を分離出力するリップル検
出回路とを設け、前記インバータの出力周波数指令値が
前記直流中間回路電圧の脈動に対応してその増減方向と
同極性にて変化するように前記出力周波数指令値に対し
前記リップル交流電圧の検出値を加算制御するものであ
る。[Means for Solving the Problems] In order to achieve the above object, the inverter current pulsation suppressing method of the present invention provides a method for suppressing current ripples in an inverter that drives an AC motor by inputting the DC intermediate circuit voltage of the inverter. A DC/DC converter that outputs a proportional voltage and a constant voltage DC voltage for controlling the inverter, and a ripple that receives the proportional voltage output from the converter as input and separates and outputs a ripple AC voltage superimposed on the proportional voltage. detecting the ripple AC voltage with respect to the output frequency command value so that the output frequency command value of the inverter changes in the same polarity as the direction of increase or decrease in response to the pulsation of the DC intermediate circuit voltage; It controls addition of values.
〔作用〕
前記の如き電圧形インバータの出力電流すなわち該イン
バータの負荷となる交流電動機の通電電流における脈動
は、前記インバータの指定周波数に対応する前記交流電
動機の指定回転数とその駆動負荷状態により変化する該
電動機の実回転数との回転数差の大きさと正負極性とに
より決定される該インバータと電動機両者間の電力の流
れの変動に伴って発生するものである。[Function] The output current of the voltage source inverter as described above, that is, the pulsation in the current flowing through the AC motor serving as the load of the inverter, changes depending on the specified rotational speed of the AC motor corresponding to the specified frequency of the inverter and its driving load condition. This occurs due to fluctuations in the power flow between the inverter and the electric motor, which are determined by the magnitude of the difference in rotational speed from the actual rotational speed of the electric motor and the positive and negative polarities.
また前記インバータの出力電流の脈動は、該インバータ
の直流中間回路における平滑コンデンサの蓄積電荷変動
を伴うものであり、その結果該コンデンサの端子電圧従
って前記直流中間回路の出力電圧の変動を来たすことに
なり、該直流中間回路出力電圧はその定格値を中心に変
動し前記の指定回転数が実回転数より低く前記交流電動
機よりその電源である前記インバータへ電力が逆流する
回生状態においては上昇し、また該両回転数と電力方向
とがそれぞれ前記の回生状態と逆になるカ行状態におい
ては低下する。すなわち前記の如き電力の流れの変動に
起因する電圧形インバータの出力電流脈動は該インバー
タの直流中間回路出力電圧の脈動検出波形と相似なもの
として検出可能となる。Furthermore, the pulsations in the output current of the inverter are accompanied by fluctuations in the accumulated charge of the smoothing capacitor in the DC intermediate circuit of the inverter, which results in fluctuations in the terminal voltage of the capacitor and thus in the output voltage of the DC intermediate circuit. The output voltage of the DC intermediate circuit fluctuates around its rated value and increases in a regenerative state in which the specified rotation speed is lower than the actual rotation speed and power flows backward from the AC motor to the inverter that is its power source, Further, both the rotational speed and the power direction decrease in a running state in which the rotational speed and the power direction are respectively opposite to those in the regeneration state. That is, the output current pulsations of the voltage source inverter due to the above-described fluctuations in the power flow can be detected as a waveform similar to the pulsation detection waveform of the DC intermediate circuit output voltage of the inverter.
従って前記直流中間回路出力電圧のリップル交流電圧検
出値の適当な比例値を前記インバータの出力周波数指定
値に対して加算演算し、前記交流電動機を、前記直流中
間回路出力電圧の上昇時には増速し該出力電圧の低下時
には減速制御することにより、前記インバータの出力電
流脈動の抑制が可能となる。Therefore, an appropriate proportional value of the ripple AC voltage detection value of the DC intermediate circuit output voltage is added to the output frequency specified value of the inverter, and the AC motor is accelerated when the DC intermediate circuit output voltage rises. By performing deceleration control when the output voltage decreases, it is possible to suppress output current pulsations of the inverter.
また電圧形インバータはその制御用定圧直流電圧を得る
ために通常その直流中間回路出力電圧を入力電圧とする
Ｄ Ｃ／Ｄ Ｃコンバータを有している。今、該ＤＣ／
ＤＣコンバータとして、変圧器の１次巻線側をスイッチ
ング素子により直列に断続（ＯＮ、０ＦＦ）Ｌ、該スイ
ッチング素子のＯＮ期間とＯＦＦ期間とに対応してそれ
ぞれ出力を得るような極性にて直列接続されたダイオー
ドを有する２組の半波整流回路を前記変圧器の２次巻線
を電源として並列に設け、前記のＯＦＦ期間に出力する
側の半波整流回路の出力電圧の平均値を所要の一定値と
なすように前記スイッチング素子のＯＦＦ期間制御を行
う回路構成をなすことにより、前記ＯＦＦ期間対応半波
整流回路から所定値の制御用直流電圧が得られると共に
前記ＯＮ期間対応半波整流回路からは前記変圧器の１次
及び２次間巻線比を比例係数としその平均値において前
記変圧器の１次側入力電圧すなわち前記直流中間回路出
力電圧に比例した値の直流電圧を得ることが可能となる
。Further, in order to obtain a constant DC voltage for control, the voltage source inverter usually has a DC/DC converter whose input voltage is the output voltage of the DC intermediate circuit. Now, the DC/
As a DC converter, the primary winding side of the transformer is connected in series with a switching element (ON, 0FF) L, with polarity such that outputs are obtained corresponding to the ON period and OFF period of the switching element. Two sets of half-wave rectifier circuits having connected diodes are provided in parallel using the secondary winding of the transformer as a power source, and the average value of the output voltage of the half-wave rectifier circuit on the output side during the OFF period is required. By configuring a circuit to control the OFF period of the switching element so as to maintain a constant value, a control DC voltage of a predetermined value can be obtained from the half-wave rectifier circuit corresponding to the OFF period, and at the same time, the half-wave rectifier circuit corresponding to the ON period can be controlled. From the circuit, a DC voltage of a value proportional to the primary side input voltage of the transformer, that is, the DC intermediate circuit output voltage is obtained from the average value of the transformer's primary and secondary winding ratio as a proportional coefficient. becomes possible.
従ってまた、前記直流中間回路電圧の比例電圧をコンデ
ンサと抵抗と増巾器とから濾波回路を構成するリップル
検出回路に入力することにより前記直流中間回路出力電
圧におけるリップル交流電圧成分の適当な増巾値を得る
ことができる。Therefore, by inputting the proportional voltage of the DC intermediate circuit voltage to a ripple detection circuit that constitutes a filter circuit from a capacitor, a resistor, and an amplifier, the ripple AC voltage component in the DC intermediate circuit output voltage can be appropriately amplified. value can be obtained.
本発明は、前記の如きＤ Ｃ／Ｄ Ｃコンバータとリッ
プル検出回路と更に加算演算器とを設け、検出した前記
直流中間回路出力電圧のリップル交流電圧成分の適当値
を前記加算演算器において前記インバータの出力周波数
指定値に加算して得られた新たなインバータ出力周波数
指令値に対応した交流電動機回転数制御を行うことによ
り、前記インバータ出力電流脈動の抑制を図るものであ
る。The present invention includes the above-mentioned DC/DC converter, ripple detection circuit, and addition calculator, and adds an appropriate value of the ripple AC voltage component of the detected DC intermediate circuit output voltage to the inverter in the addition calculator. The inverter output current pulsation is suppressed by performing AC motor rotational speed control corresponding to a new inverter output frequency command value obtained by adding it to the output frequency designation value.
以下この発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図はこの発明の実施例を示す電圧形インバータの全
体回路図、第２図は第１図におけるＤＣ／ＤＣコンバー
タの回路図、第３図は第１図回路各部の動作波形図であ
る。Fig. 1 is an overall circuit diagram of a voltage source inverter showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the DC/DC converter in Fig. 1, and Fig. 3 is an operating waveform diagram of each part of the circuit shown in Fig. 1. .
第１図において、１は交流電源、２は整流器、３はその
端子電圧がｖｄｃである平滑コンデンサ、４はスイッチ
ングトランジスタとその逆並列ダイオードとを主要素子
とじＰＷＭ制御回路を含むインバータ部である。なお前
記の整流器２と平滑コンデンサ３とはインバータ部４に
対する直流中間回路を構成しその出力電圧が前記電圧ｖ
ｄｃとなる。In FIG. 1, 1 is an AC power supply, 2 is a rectifier, 3 is a smoothing capacitor whose terminal voltage is VDC, and 4 is an inverter section including a PWM control circuit whose main elements are a switching transistor and its antiparallel diode. The rectifier 2 and the smoothing capacitor 3 constitute a DC intermediate circuit for the inverter section 4, and the output voltage thereof is equal to the voltage v.
It becomes d.c.
５は交流電動機、６はＤ Ｃ／Ｄ Ｃコンバータであり
前記電圧Ｖ Ｌｌ ｃを入力とし所定の定圧直流電圧Ｖ
ＣＯと前記電圧■。に比例した直流電圧Ｖ、。とを出
力するものである。また７は所要の制御用直流電圧■。5 is an AC motor, and 6 is a DC/DC converter, which inputs the voltage V Ll c and converts it to a predetermined constant voltage DC voltage V.
CO and the voltage ■. DC voltage V, proportional to . This outputs the following. 7 is the required control DC voltage.
を得るために前記電圧Ｖ ｃｏの一層の安定化を要する
場合に用いる電圧の安定化回路であり、８は前記電圧ｖ
７゜のリップル交流分を適当なレベルの電圧信号■、と
して検出するリップル検出回路、９は加算演算器である
。前記インバータ部４のＰＷＭ制御回路に対し入力され
るインバータ出力周波数指令ｆｓはその原指令ｆ５゜と
インバータ出力電流ｆ、の脈動抑制に最適のレベルにて
作成した前記電圧信号Ｖ、とを前記加算演算器９にて加
算して得たものであり、前記出力周波数指令ｆ、に対応
する回転数を目標に前記交流電動機５は回転数制御され
前記インバータ出力電流１． ｔの脈動が抑制される。8 is a voltage stabilizing circuit used when further stabilization of the voltage Vco is required to obtain the voltage Vco.
A ripple detection circuit 9 detects a ripple alternating current component of 7° as a voltage signal (2) at an appropriate level, and 9 is an addition calculator. The inverter output frequency command fs input to the PWM control circuit of the inverter section 4 is obtained by adding the original command f5° and the voltage signal V created at the optimum level for suppressing pulsation of the inverter output current f. The AC motor 5 is controlled to have a rotation speed corresponding to the output frequency command f, and the inverter output current 1. t pulsation is suppressed.
次に第２図に示すＤ Ｃ／Ｄ Ｃコンバータの回路図に
ついて説明する。Next, the circuit diagram of the DC/DC converter shown in FIG. 2 will be explained.
第２図（イ）において、Ｔ、１は図示・印の如き巻線極
性の１次巻線Ｗ、と２次巻線Ｗ２とを有する変圧器、Ｔ
は前記１次巻線Ｗ１回路を直列に断続するスイッチング
トランジスタ、ＢＣＵは該トランジスタＴのベースに対
するベース制御回路、Ｃ５とＣｔとは平滑コンデンサ、
Ｄ、とＤ２とはダイオードである。In FIG. 2(a), T1 is a transformer having a primary winding W and a secondary winding W2 with winding polarities as shown and marked, T.
is a switching transistor that connects and connects the primary winding W1 circuit in series, BCU is a base control circuit for the base of the transistor T, C5 and Ct are smoothing capacitors,
D and D2 are diodes.
図示の如く、前記Ｃ，−Ｄ、とＣｔ Ｄｚとの各接続
は前記巻線Ｗ２の出力電圧を入力とする２組の半波整流
回路を構成し、一方のＣｔ Ｄｚ回路は前記電圧Ｖ、
１（が印加された前記１次巻線Ｗ。As shown in the figure, each connection between C, -D and Ct Dz constitutes two sets of half-wave rectifier circuits that receive the output voltage of the winding W2, and one Ct Dz circuit receives the voltage V,
1( is applied to the primary winding W.
回路が前記トランジスタＴのＯＮ動作により導通した場
合に電圧■、。を出力するものであり、他方のＣ＋
Ｄ ＋回路は逆に前記トランジスタＴのＯＦＦ動作時
に電圧Ｖ ｃｏを出力するものである。When the circuit becomes conductive due to the ON operation of the transistor T, the voltage ■. , and the other C+
Conversely, the D + circuit outputs the voltage V co when the transistor T is turned off.
前記電圧■１゜は前記電源電圧Ｖ４＜を前記両巻線Ｗ、
−Ｗ、間の巻線比にて変圧した値して得られ、一方前記
電圧■。。は前記巻線Ｗ２における蓄積エネルギの前記
トランジスタＴのＯＦ Ｆ ｘ、ｕ間における放出度合
に従って決定される。従って前記電圧Ｖ ｅｏを制御対
象として前記制御回路ＢＣＵに帰還させ、前記電圧■。The voltage ■1° is the power supply voltage V4< of both the windings W,
- W, obtained by transforming the voltage at a winding ratio between, while the above voltage ■. . is determined according to the degree of release of the energy stored in the winding W2 between OFx, u of the transistor T. Therefore, the voltage V eo is fed back to the control circuit BCU as a control target, and the voltage V eo is returned to the control circuit BCU.
。を所要の一定値となすように前記トランジスタＴのＯ
ＦＦ時間制御を行うことにより、前記Ｃ，−Ｄ、回路か
らは所要の定圧直流電圧Ｖ、。が得られ、また前記Ｃｚ
Ｄｉ回路からは前記電源電圧Ｖｄｃに比例した電圧
■１゜が得られることになる。. O of the transistor T is set such that O is a constant value.
By performing FF time control, the required constant voltage DC voltage V is output from the circuits C and -D. is obtained, and the Cz
A voltage of 1° proportional to the power supply voltage Vdc is obtained from the Di circuit.
第２図（ロ）は、第２図（イ）における変圧器’ｒｒ＋
の２次巻線Ｗ２を２巻線ＷＺＩとＷ２□とに分割し、該
変圧器Ｔ１１とＤ Ｃ／Ｄ Ｃコンバータ６とをそれぞ
れＴ、、、と６ａとに符号変更したものであり、その動
作機能においては第２図（イ）の場合と全く同様である
。Figure 2 (B) shows the transformer 'rr+ in Figure 2 (A).
The secondary winding W2 of is divided into two windings WZI and W2□, and the signs of the transformer T11 and the DC/DC converter 6 are changed to T, , , and 6a, respectively. The operating function is exactly the same as that shown in FIG. 2(a).
次に第３図に示す動作波形図において、図（イ）は前記
のインバータ出力電流■、の脈動に伴う直流中間回路出
力電圧Ｖ ４ （の脈動模様を示し、図（ロ）は前記電
圧Ｖ４（のリップル交流電圧骨の検出電圧信号Ｖ、の波
形を示し、図（ハ）はインバータ出力周波数源指令ｆ
ｓｏに対し前記信号Ｖ、を加算して得た新たなインバー
タ出力周波数指令ｆ８の波形を示すものである。Next, in the operation waveform diagram shown in FIG. 3, diagram (a) shows the pulsation pattern of the DC intermediate circuit output voltage V 4 (accompanied by the pulsation of the inverter output current 2), and diagram (b) shows the pulsation pattern of the DC intermediate circuit output voltage V 4 (2). (C) shows the waveform of the detected voltage signal V of the ripple AC voltage bone.
It shows the waveform of a new inverter output frequency command f8 obtained by adding the signal V to so.
本発明によれば、交流電動機を制御する汎用電圧形イン
バータにおいて、その直流中間回路電圧を入力とするＤ
Ｃ／ＤＣコンバータを前記の如き回路構成となしてイン
バータ制御用定圧直流電圧と前記直流中間回路電圧に対
する比例電圧とを容易に取出し可能となし、該比例電圧
のリップル成分を分離し、該リップル成分の加算により
インバータ出力周波数指令値の修正変更を行うことによ
リ、インバータ出力電流の脈動抑制が特別のリップル検
出・補償装置を設けることなく面易且つ安価に可能とな
り、更に前記インバータの交流電動機に対する組合せ上
の制約もまた軽減される。According to the present invention, in a general-purpose voltage source inverter that controls an AC motor, the DC intermediate circuit voltage is input to the D
By configuring the C/DC converter as described above, it is possible to easily extract a constant voltage DC voltage for inverter control and a proportional voltage to the DC intermediate circuit voltage, and to separate the ripple component of the proportional voltage. By modifying the inverter output frequency command value by adding The combinatorial constraints on are also reduced.
第１図はこの発明の実施例を示す電圧形インバータの全
体回路図、第２図は第１図におけるＤＣ／ＤＣコンバー
タの回路図、第３図は第１図回路各部の動作波形図であ
る。
ｌ・・・交流電源、２・・・整流器、３・・・平滑コン
デンサ、４・・・インバータ部、５・・・交流電動機、
６．６ａ・・・Ｄ Ｃ／Ｄ Ｃコンバータ、７・・・安
定化回路、８・・・リップル検出回路、９・・・加算演
算器、ＥＣＵ・・・ベース制御回路、Ｃ，、Ｃ２・・・
平滑コンデンサ、Ｄ、、Ｄ、・・・ダイオード、Ｔ・・
・スイッチングトランジスタ、Ｔ、・・・変圧器。
（ハ）Fig. 1 is an overall circuit diagram of a voltage source inverter showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the DC/DC converter in Fig. 1, and Fig. 3 is an operating waveform diagram of each part of the circuit shown in Fig. 1. . l... AC power supply, 2... Rectifier, 3... Smoothing capacitor, 4... Inverter section, 5... AC motor,
6.6a... D C/DC converter, 7... Stabilization circuit, 8... Ripple detection circuit, 9... Addition calculator, ECU... Base control circuit, C,, C2.・・・
Smoothing capacitor, D,, D,...diode, T...
・Switching transistor, T...transformer. (c)
Claims (1)
該インバータの直流中間回路電圧を入力とし該入力電圧
の比例電圧と該インバータの制御用定圧直流電圧とを出
力するＤＣ／ＤＣコンバータと、該コンバータの出力す
る前記比例電圧を入力とし該比例電圧に重畳したリップ
ル交流電圧を分離出力するリップル検出回路とを設け、
前記インバータの出力周波数指令値が前記直流中間回路
電圧の脈動に対応してその増減方向と同極性にて変化す
るように前記出力周波数指令値に対し前記リップル交流
電圧の検出値を加算制御することを特徴とするインバー
タの電流脈動抑制方法。1) In a voltage source inverter that drives an AC motor,
a DC/DC converter that receives the DC intermediate circuit voltage of the inverter and outputs a proportional voltage of the input voltage and a constant voltage DC voltage for controlling the inverter; It is equipped with a ripple detection circuit that separates and outputs the superimposed ripple AC voltage,
Adding and controlling the detected value of the ripple AC voltage to the output frequency command value so that the output frequency command value of the inverter changes in the same polarity as the increasing/decreasing direction of the DC intermediate circuit voltage in response to the pulsations of the DC intermediate circuit voltage. A method for suppressing current pulsation in an inverter, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277701A JPH03139196A (en) | 1989-10-25 | 1989-10-25 | Suppression of current ripple in inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277701A JPH03139196A (en) | 1989-10-25 | 1989-10-25 | Suppression of current ripple in inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03139196A true JPH03139196A (en) | 1991-06-13 |
Family
ID=17587109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1277701A Pending JPH03139196A (en) | 1989-10-25 | 1989-10-25 | Suppression of current ripple in inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03139196A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004114514A1 (en) * | 2003-06-24 | 2004-12-29 | Askoll Holding S.R.L. | Control method for a synchronous motor, particularly for circulation pumps |
| KR20140110998A (en) | 2012-02-15 | 2014-09-17 | 후지쯔 콤포넌트 가부시끼가이샤 | Touch panel and position detection method |
| WO2023127034A1 (en) * | 2021-12-27 | 2023-07-06 | 三菱電機株式会社 | Power conversion device and air conditioner |
-
1989
- 1989-10-25 JP JP1277701A patent/JPH03139196A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004114514A1 (en) * | 2003-06-24 | 2004-12-29 | Askoll Holding S.R.L. | Control method for a synchronous motor, particularly for circulation pumps |
| KR100807373B1 (en) * | 2003-06-24 | 2008-02-28 | 아스콜 홀딩 에스.알.엘. | Control Method for a Synchronous Motor, Particularly for Circular Pumps |
| US7576510B2 (en) | 2003-06-24 | 2009-08-18 | Askoll Holding S.R.L. | Control method for a synchronous motor, particularly for circulation pumps |
| KR20140110998A (en) | 2012-02-15 | 2014-09-17 | 후지쯔 콤포넌트 가부시끼가이샤 | Touch panel and position detection method |
| WO2023127034A1 (en) * | 2021-12-27 | 2023-07-06 | 三菱電機株式会社 | Power conversion device and air conditioner |
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