JP5278091B2 - Induction motor rotation speed estimation apparatus and estimation method - Google Patents

Induction motor rotation speed estimation apparatus and estimation method Download PDF

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JP5278091B2
JP5278091B2 JP2009076950A JP2009076950A JP5278091B2 JP 5278091 B2 JP5278091 B2 JP 5278091B2 JP 2009076950 A JP2009076950 A JP 2009076950A JP 2009076950 A JP2009076950 A JP 2009076950A JP 5278091 B2 JP5278091 B2 JP 5278091B2
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邦朗 平尾
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce an estimation error in the rotating speed of an induction motor even when there is a voltage difference in the output of a PWM inverter. <P>SOLUTION: An estimator for the number of revolutions of an induction motor is so configured that the following is implemented: an induction motor 1 is controlled through a PWM inverter 2 according to a voltage command; an alternating-current voltage oscillator 6 produces a single-phase alternating-current voltage with a swept frequency; a primary current obtained when the alternating-current voltage is applied to an idling induction motor is detected with a three-phase/two-phase converter 4; and the number of revolutions of the induction motor is estimated from the ratio of minor axis/major axis of an ellipse drawn by the resulting current Lissajous figure. An amplitude computing unit 9A determines a current amplitude from &alpha;&beta; axis components of the current Lissajous figure with resect to each sweep of the frequency of the single-phase alternating-current voltage. A frequency adjuster 9B reduces the carrier frequency of the PWM inverter until the maximum value of current amplitude becomes equal to or higher than a reference value. After an estimation of the number of revolutions carried out when the maximum value of current amplitude becomes equal to or higher than the reference value, the frequency adjuster returns the carrier frequency to the original frequency. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、誘導電動機の速度センサレス制御装置に係り、特に周波数をスイープした単相交流電圧を空転中の誘導電動機に印加したときの一次電流から回転数を推定する誘導電動機の回転数推定装置および推定方法に関する。   The present invention relates to a speed sensorless control device for an induction motor, and more particularly to a rotation speed estimation device for an induction motor that estimates a rotation speed from a primary current when a single-phase AC voltage having a swept frequency is applied to an induction motor that is idling. It relates to an estimation method.

速度センサを有さない誘導電動機をインバータなどの制御装置で駆動するシステムにおいて、空転中の誘導電動機の回転数・回転方向を検出する場合、誘導電動機の一次電流の特徴量を監視して推定する方式がある（例えば、特許文献１参照）。   In a system in which an induction motor without a speed sensor is driven by a control device such as an inverter, when detecting the rotation speed and rotation direction of an induction motor that is idling, the feature value of the primary current of the induction motor is monitored and estimated. There is a method (for example, refer to Patent Document 1).

この文献１では、図３に構成例を示すように、単相の交流電圧を発振する発振器を設けて、空転中の誘導電動器に単相交流電圧の周波数をスイープしながら印加し、この印加時の誘導電動機の一次電流を検出して固定座標軸上の直交した２軸成分に変換し、２軸上の電流リサージュの波形の描く楕円の短軸／長軸の比率と電流リサージュの回転方向で空転中の誘導電動機の回転数・回転方向を推定する。   In this document 1, as shown in the configuration example of FIG. 3, an oscillator that oscillates a single-phase AC voltage is provided, and the frequency of the single-phase AC voltage is applied to the idle induction motor while sweeping. The primary current of the induction motor is detected and converted into orthogonal two-axis components on the fixed coordinate axis, and the ratio of the minor axis / major axis of the ellipse drawn by the current Lissajous waveform on the two axes and the current Lissajous rotation direction Estimate the rotation speed and rotation direction of the induction motor that is idling.

図３において、誘導電動機１は、電力変換器であるPWMインバータ２により駆動される。誘導電動機１の一次電流は、変流器３により検出され、３相／２相変換手段４により一次電流の軸成分Ｉα*、Ｉβ*に変換される。５は２相／３相変換手段で、この２相／３相変換手段において３相の電圧指令Ｖｕ*、Ｖｖ*、Ｖｗ*に変換される。６は単相の交流電圧発振器で、この発振器６の単相交流出力は、周波数／電圧制御器７からの電圧指令Ｖα*、Ｖβ*のうち何れでもよいが、ここではＶα*に加算されてＶβ*と共に２相／３相変換手段５入力される。８は周波数指令値を入力して位相信号に変換する位相変換器である。 In FIG. 3, the induction motor 1 is driven by a PWM inverter 2 which is a power converter. The primary current of the induction motor 1 is detected by the current transformer 3 and converted into the axial components Iα * and Iβ * of the primary current by the 3-phase / 2-phase conversion means 4. Reference numeral 5 denotes a two-phase / three-phase conversion means, which converts the three-phase voltage commands Vu * , Vv * , Vw * in the two-phase / three-phase conversion means. 6 is a single-phase AC voltage oscillator, and the single-phase AC output of this oscillator 6 may be any one of the voltage commands Vα * and Vβ * from the frequency / voltage controller 7, but here it is added to Vα *. Two-phase / three-phase conversion means 5 is input together with Vβ * . A phase converter 8 receives a frequency command value and converts it into a phase signal.

まず、３相のＵ、Ｖ、Ｗの軸と固定座標軸上の直交したαβの２軸を図４で示すように定義する。空転中の誘導電動機１に単相交流電圧を印加し、単相交流電圧の周波数を誘導電動機１の最高周波数からゼロ方向へスイープする。このときの誘導電動機１の一次電流を変流器３により検出し、３相／２相変換手段４により固定座標上の直交した２軸のαβ成分に変換すると、αβ軸上の電流リサージュは図５の（ア）〜（コ）のような波形を描く。   First, as shown in FIG. 4, two axes of αβ, which are orthogonal to the three-phase U, V, W axes and the fixed coordinate axes, are defined. A single-phase AC voltage is applied to the idling induction motor 1 and the frequency of the single-phase AC voltage is swept from the highest frequency of the induction motor 1 in the zero direction. When the primary current of the induction motor 1 at this time is detected by the current transformer 3, and converted into two orthogonal αβ components on the fixed coordinates by the three-phase / two-phase conversion means 4, the current Lissajous on the αβ axis is shown in FIG. Draw a waveform like 5 (a) to (ko).

図５の（ａ）は誘導電動機が正転中に単相交流電圧を印加した場合を示し、（ｂ）は逆転時に単相交流電圧を印加した場合を示し、単相交流電圧の周波数と誘導電動機の回転数の大小で細い楕円から太い楕円を経て再び細い楕円に変化し、両周波数が一致した場合に最も太い楕円になる。このことを利用し、固定座標軸と直交した２軸の中のα軸に単相交流電圧を印加することにより、電流リサージュが描く楕円の短軸／長軸の比率と電流リサージュの回転方向を３相／２相変換手段４，若しくは３相／２相変換後において監視することにより、空転中の誘導電動機の回転数と回転方向の推定を行う。   FIG. 5A shows a case where a single-phase AC voltage is applied during forward rotation of the induction motor, and FIG. 5B shows a case where a single-phase AC voltage is applied during reverse rotation. Depending on the rotation speed of the motor, it changes from a thin ellipse to a thin ellipse again through a thick ellipse, and becomes the thickest ellipse when both frequencies match. By utilizing this, by applying a single-phase AC voltage to the α axis in two axes orthogonal to the fixed coordinate axis, the ratio of the minor axis / major axis of the ellipse drawn by the current Lissajous and the rotation direction of the current Lissajous are 3 By monitoring the phase / 2-phase conversion means 4 or after the three-phase / 2-phase conversion, the number of rotations and the direction of rotation of the induction motor during idling are estimated.

特開２００７−２６７４６８号公報JP 2007-267468 A

図３の構成において、ＰＷＭインバータ２はＰＷＭ制御により擬似正弦波電圧を出力する。このとき、インバータ主回路のスイッチング素子のコレクタ・エミッタ電圧（Ｖｃｅ）による電圧降下のバラツキにより、出力電圧の振幅に電圧差を生じる。   In the configuration of FIG. 3, the PWM inverter 2 outputs a pseudo sine wave voltage by PWM control. At this time, a voltage difference is generated in the amplitude of the output voltage due to variations in the voltage drop due to the collector-emitter voltage (Vce) of the switching element of the inverter main circuit.

また、ＰＷＭインバータは、スイッチング素子の上下アーム同時オンによる直流電圧短絡を防ぐために、ＰＷＭキャリアによるスイッチングのたびにデッドタイムを設けている。このデッドタイムの介挿とスイッチングの遅れによっても３相間の出力電圧の振幅に電圧降下を生じる。これらのＰＷＭインバータの電圧差を図６に示す。   In addition, the PWM inverter has a dead time each time switching is performed by the PWM carrier in order to prevent a DC voltage short circuit due to simultaneous turning on of the upper and lower arms of the switching element. This dead time insertion and switching delay also cause a voltage drop in the amplitude of the output voltage between the three phases. The voltage difference between these PWM inverters is shown in FIG.

これら電圧差のうち、デッドタイムなどスイッチングにより発生するものについては、キャリア周波数に依存して大きくなる。よって、前記の特許文献１の方式で電流リサージュを計測する際に、キャリア周波数が高い場合には、図７の（ｂ）に示すように、電圧差の影響によりリサージュ電流振幅が小さくなる場合もあり、空転中の誘導電動機の回転数・回転方向の推定が出来なくなる問題が発生する。   Among these voltage differences, those generated by switching such as dead time increase depending on the carrier frequency. Therefore, when the current Lissajous is measured by the method of Patent Document 1, if the carrier frequency is high, the Lissajous current amplitude may be reduced due to the influence of the voltage difference as shown in FIG. There is a problem that it is impossible to estimate the rotation speed and rotation direction of the induction motor that is idling.

これら電圧差の影響を無くすために、従来の技術で、出力電流極性に応じて補償電圧を加算する方式がある。しかし、前記の特許文献１の方式では、単相交流電圧の周波数を比較的高速にスイープしながら印加するため、この補償が印加電圧のスイープに追従できず、逆に外乱要素となってしまう。   In order to eliminate the influence of these voltage differences, there is a conventional technique in which a compensation voltage is added according to the output current polarity. However, in the method disclosed in Patent Document 1, since the frequency of the single-phase AC voltage is applied while sweeping at a relatively high speed, this compensation cannot follow the sweep of the applied voltage, and conversely becomes a disturbance factor.

本発明の目的は、ＰＷＭインバータの出力に電圧差がある場合にも誘導電動機の回転数の推定誤差を減らすことができる誘導電動機の回転数推定装置および推定方法を提供することにある。   An object of the present invention is to provide an induction motor rotation speed estimation device and an estimation method capable of reducing an estimation error of the rotation speed of an induction motor even when there is a voltage difference in the output of a PWM inverter.

本発明は、前記の課題を解決するため、単相交流電圧の周波数を誘導電動機の最高周波数からゼロ方向へスイープしたときの誘導電動機の一次電流リサージュの振幅がある基準値を下回る場合に、キャリア周波数を低減して電流リサージュ振幅を増加させることにより、電圧差の影響を低減して電流リサージュ振幅を増加し、この振幅増加した電流リサージュが描く楕円の短軸／長軸の比率から回転数を推定するようにしたもので、以下の装置および方法を特徴とする。   In order to solve the above-described problem, the present invention provides a carrier when the amplitude of the primary current Lissajous of the induction motor is less than a reference value when the frequency of the single-phase AC voltage is swept from the highest frequency of the induction motor to the zero direction. By reducing the frequency and increasing the current Lissajous amplitude, the influence of the voltage difference is reduced and the current Lissajous amplitude is increased, and the rotation speed is calculated from the ratio of the short axis / long axis of the ellipse drawn by this increased current Lissajous. The apparatus is characterized by the following apparatus and method.

（１）２相／３相変換器によって変換された電圧指令に基づき、ＰＷＭインバータを介して誘導電動機を制御し、周波数をスイープした単相交流電圧を前記ＰＷＭインバータを介して空転中の誘導電動機に印加したときの一次電流リサージュが描く楕円の短軸／長軸の比率から誘導電動機の回転数を推定する誘導電動機の回転数推定装置において、
前記単相交流電圧の周波数のスイープ毎に前記電流リサージュのαβ軸成分から電流振幅を求める振幅演算器と、
前記電流振幅の最大値が基準値以上になるまで、前記ＰＷＭインバータのキャリア周波数を低減し、前記電流振幅の最大値が基準値以上になったときの回転数推定後にキャリア周波数を元の周波数に復帰させる周波数調節器と、
を備えたことを特徴とする。 (1) An induction motor that controls an induction motor via a PWM inverter based on a voltage command converted by a two-phase / three-phase converter, and idles a single-phase AC voltage sweeping the frequency via the PWM inverter. In the induction motor rotation speed estimation device for estimating the rotation speed of the induction motor from the ratio of the short axis / long axis of the ellipse drawn by the primary current Lissajous when applied to
An amplitude calculator for obtaining a current amplitude from an αβ axis component of the current Lissajous for each sweep of the frequency of the single-phase AC voltage;
The carrier frequency of the PWM inverter is reduced until the maximum value of the current amplitude is equal to or higher than a reference value, and the carrier frequency is restored to the original frequency after the rotation speed is estimated when the maximum value of the current amplitude is equal to or higher than the reference value. A frequency adjuster to be restored,
It is provided with.

（２）２相／３相変換器によって変換された電圧指令に基づき、ＰＷＭインバータを介して誘導電動機を制御し、周波数をスイープした単相交流電圧を前記ＰＷＭインバータを介して空転中の誘導電動機に印加したときの一次電流リサージュが描く楕円の短軸／長軸の比率から誘導電動機の回転数を推定する誘導電動機の回転数推定方法において、
前記単相交流電圧の周波数のスイープ毎に前記電流リサージュのαβ軸成分から電流振幅を求める振幅演算ステップと、
前記電流振幅の最大値が基準値以上になるまで、前記ＰＷＭインバータのキャリア周波数を低減し、前記電流振幅の最大値が基準値以上になったときの回転数推定後にキャリア周波数を元の周波数に復帰させる周波数調節ステップと、
を有することを特徴とする。 (2) Based on the voltage command converted by the two-phase / three-phase converter, the induction motor is controlled via the PWM inverter, and the single-phase AC voltage whose frequency is swept is idled via the PWM inverter. In the induction motor rotation speed estimation method for estimating the rotation speed of the induction motor from the ratio of the short axis / long axis of the ellipse drawn by the primary current Lissajous when applied to
An amplitude calculation step for obtaining a current amplitude from an αβ axis component of the current Lissajous for each frequency sweep of the single-phase AC voltage;
The carrier frequency of the PWM inverter is reduced until the maximum value of the current amplitude is equal to or higher than a reference value, and the carrier frequency is restored to the original frequency after the rotation speed is estimated when the maximum value of the current amplitude is equal to or higher than the reference value. A frequency adjustment step to return,
It is characterized by having.

以上のとおり、本発明によれば、単相交流電圧の周波数を誘導電動機の最高周波数からゼロ方向へスイープしたときの誘導電動機の一次電流リサージュの振幅がある基準値を下回る場合に、キャリア周波数を低減して電流リサージュ振幅を増加させることにより、電圧差の影響を低減して電流リサージュ振幅を増加し、この振幅増加した電流リサージュが描く楕円の短軸／長軸の比率から回転数を推定するようにしたため、ＰＷＭインバータの出力に電圧差がある場合にも誘導電動機の回転数の推定誤差を減らすことができる。   As described above, according to the present invention, when the amplitude of the primary current Lissajous of the induction motor is less than a reference value when the frequency of the single-phase AC voltage is swept from the highest frequency of the induction motor to the zero direction, the carrier frequency is decreased. By reducing and increasing the current Lissajous amplitude, the influence of the voltage difference is reduced to increase the current Lissajous amplitude, and the rotation speed is estimated from the ratio of the short axis / long axis of the ellipse drawn by this increased current Lissajous As a result, the estimation error of the rotation speed of the induction motor can be reduced even when there is a voltage difference in the output of the PWM inverter.

本発明の実施形態を示す誘導電動機の速度センサレス制御装置の構成図。The block diagram of the speed sensorless control apparatus of the induction motor which shows embodiment of this invention. 実施形態におけるキャリア周波数調節の動作フロー。The operation | movement flow of the carrier frequency adjustment in embodiment. 誘導電動機の速度センサレス制御装置の構成図。The block diagram of the speed sensorless control apparatus of an induction motor. ３相のＵ、Ｖ、Ｗの軸と固定座標軸上の直交したαβの２軸の例。An example of two axes of αβ orthogonal to a three-phase U, V, W axis and a fixed coordinate axis. αβ軸上の電流リサージュ波形。Current Lissajous waveform on αβ axis. ＰＷＭインバータの電圧差の例。The example of the voltage difference of a PWM inverter. キャリア周波数別の電流リサージュ波形例。Examples of current Lissajous waveforms by carrier frequency.

図１は、本発明の実施形態を示す誘導電動機の速度センサレス制御装置の構成図である。同図が図３と異なる部分は、キャリア周波数制御部９を追加した点にある。なお、ＰＷＭインバータ２は、電圧指令ＶU *，ＶV *，ＶW *に応じたＰＷＭ波形を生成するＰＷＭ制御器２Ａと、このＰＷＭ波形でゲート制御されるインバータ２Ｂに分離した構成で示す。 FIG. 1 is a configuration diagram of a speed sensorless control device for an induction motor showing an embodiment of the present invention. 3 is different from FIG. 3 in that a carrier frequency control unit 9 is added. The PWM inverter 2 is shown in a configuration separated into a PWM controller 2A that generates a PWM waveform corresponding to the voltage commands V U * , V V * , and V W * and an inverter 2B that is gate-controlled with this PWM waveform. .

前記のように、空転中の誘導電動機１の回転数・回転方向の推定には、交流電圧発振器６から単相交流電圧をα軸に印加し、単相交流電圧の周波数を誘導電動機１の最高周波数からゼロ方向へスイープしたときの誘導電動機１の一次電流を検出し、３相／２相変換器４により固定座標軸上の直交した２軸（αβ軸）成分に変換し、この電流リサージュが描く楕円の短軸／長軸の比率と電流リサージュの回転方向を監視することにより、空転中の誘導電動機の回転数と回転方向を推定する。   As described above, in order to estimate the rotation speed and rotation direction of the induction motor 1 during idling, a single-phase AC voltage is applied to the α axis from the AC voltage oscillator 6, and the frequency of the single-phase AC voltage is set to the maximum of the induction motor 1. The primary current of the induction motor 1 when swept from the frequency to the zero direction is detected and converted into two orthogonal (αβ axis) components on the fixed coordinate axis by the three-phase / two-phase converter 4, and this current Lissajous is drawn By monitoring the ratio of the minor axis / major axis of the ellipse and the direction of rotation of the current Lissajous, the number of revolutions and the direction of rotation of the induction motor during idling are estimated.

ここで、キャリア周波数制御部９は、３相／２相変換器４で変換した電流Ｉα*とＩβ*が呈する電流リサージュの振幅を求める振幅演算器９Ａと、この演算結果となる振幅が予め設定される基準値よりも小さい場合にキャリア周波数指令ｆｃの周波数を下げてＰＷＭ制御器２Ａのキャリア信号とする周波数調節器９Ｂを備える。 Here, the carrier frequency control unit 9 sets an amplitude calculator 9A for obtaining the amplitude of the current Lissajous exhibited by the currents Iα * and Iβ * converted by the three-phase / two-phase converter 4, and the amplitude as the calculation result is set in advance. When the frequency is smaller than the reference value, a frequency adjuster 9B is provided that lowers the frequency of the carrier frequency command fc to make the carrier signal of the PWM controller 2A.

この構成により、振幅演算器９Ａでは誘導電動機１の一次電流のαβ軸成分から電流の振幅をスイープ期間に亘って求め、周波数調節器９Ｂでは電流振幅の演算結果について、電流振幅の最大値を監視し、これが基準値を超える振幅が得られなかった場合は、キャリア周波数を低減してＰＷＭ制御器のキャリア周波数とする。このキャリア周波数を調節した後、再度、単相交流電圧を最高周波数からゼロ方向へスイープさせ、キャリア周波数制御部９による振幅監視とキャリア周波数切替え行う。この動作を、基準値を超える振幅が得られるまで繰り返すことにより、精度良く空転中の誘導電動機の回転数推定さらには回転方向の推定が可能になる。計測終了後は、キャリア周波数を本来の値に戻して、ＰＷＭインバータ２は再始動を開始する。   With this configuration, the amplitude calculator 9A calculates the current amplitude from the αβ axis component of the primary current of the induction motor 1 over the sweep period, and the frequency adjuster 9B monitors the maximum value of the current amplitude for the calculation result of the current amplitude. If the amplitude exceeding the reference value is not obtained, the carrier frequency is reduced to the carrier frequency of the PWM controller. After adjusting the carrier frequency, the single-phase AC voltage is swept from the highest frequency to the zero direction again, and amplitude monitoring and carrier frequency switching by the carrier frequency control unit 9 are performed. By repeating this operation until an amplitude exceeding the reference value is obtained, it is possible to accurately estimate the rotational speed of the induction motor that is idling and further estimate the rotational direction. After the measurement is completed, the carrier frequency is returned to the original value, and the PWM inverter 2 starts restarting.

図２は上記のキャリア周波数調節の動作フローを示す。単相交流電圧をスイープさせながら印加し（Ｓ１）、１回のスイープ期間における電流振幅最大値が基準値以上か否かを監視し（Ｓ２）、基準値以上でなければキャリア周波数の低減処理を行う（Ｓ３）。この繰り返し処理で電流振幅最大値が基準値以上になれば（Ｓ２）、電流リサージュの長軸と短軸の比率から誘導電動機の実回転速度を推定し（Ｓ４）、この推定に際してキャリア周波数の低減を行ったか否かをチェックし（Ｓ５）、低減していればキャリア周波数を元の周波数への復帰処理を行い（Ｓ６）、低減していなければ回転数推定を終える。   FIG. 2 shows an operation flow of the above carrier frequency adjustment. A single-phase AC voltage is applied while sweeping (S1), and it is monitored whether the current amplitude maximum value in one sweep period is greater than or equal to a reference value (S2). Perform (S3). If the maximum value of current amplitude exceeds the reference value in this iterative process (S2), the actual rotational speed of the induction motor is estimated from the ratio of the major axis to the minor axis of the current Lissajous (S4), and the carrier frequency is reduced in this estimation. (S5), if the frequency is reduced, the carrier frequency is restored to the original frequency (S6). If the frequency is not reduced, the estimation of the rotational speed is finished.

このように、本実施形態では、単相交流電圧印加時の電流リサージュの振幅がある基準値を下回る場合に、キャリア周波数を低減することにより、電圧差の影響を低減して電流リサージュ振幅を増加し、空転中の誘導電動機の回転数の推定精度を向上させる。   As described above, in this embodiment, when the amplitude of the current Lissajous when the single-phase AC voltage is applied falls below a certain reference value, the influence of the voltage difference is reduced and the current Lissajous amplitude is increased by reducing the carrier frequency. In addition, the estimation accuracy of the rotational speed of the induction motor during idling is improved.

１ 誘導電動機
２ ＰＷＭインバータ
６ 交流電圧発振器
９ キャリア周波数制御部
９Ａ 振幅演算器
９Ｂ 周波数調節器 DESCRIPTION OF SYMBOLS 1 Induction motor 2 PWM inverter 6 AC voltage oscillator 9 Carrier frequency control part 9A Amplitude calculator 9B Frequency regulator

Claims (2)

２相／３相変換器によって変換された電圧指令に基づき、ＰＷＭインバータを介して誘導電動機を制御し、周波数をスイープした単相交流電圧を前記ＰＷＭインバータを介して空転中の誘導電動機に印加したときの一次電流リサージュが描く楕円の短軸／長軸の比率から誘導電動機の回転数を推定する誘導電動機の回転数推定装置において、
前記単相交流電圧の周波数のスイープ毎に前記電流リサージュのαβ軸成分から電流振幅を求める振幅演算器と、
前記電流振幅の最大値が基準値以上になるまで、前記ＰＷＭインバータのキャリア周波数を低減し、前記電流振幅の最大値が基準値以上になったときの回転数推定後にキャリア周波数を元の周波数に復帰させる周波数調節器と、
を備えたことを特徴とする誘導電動機の回転数推定装置。 Based on the voltage command converted by the two-phase / three-phase converter, the induction motor is controlled via the PWM inverter, and the single-phase AC voltage sweeping the frequency is applied to the idle induction motor via the PWM inverter. In the induction motor rotation speed estimation device for estimating the rotation speed of the induction motor from the ratio of the short axis / long axis of the ellipse drawn by the primary current Lissajous
An amplitude calculator for obtaining a current amplitude from an αβ axis component of the current Lissajous for each sweep of the frequency of the single-phase AC voltage;
The carrier frequency of the PWM inverter is reduced until the maximum value of the current amplitude is equal to or higher than a reference value, and the carrier frequency is restored to the original frequency after the rotation speed is estimated when the maximum value of the current amplitude is equal to or higher than the reference value. A frequency adjuster to be restored,
An induction motor rotation speed estimation device comprising: ２相／３相変換器によって変換された電圧指令に基づき、ＰＷＭインバータを介して誘導電動機を制御し、周波数をスイープした単相交流電圧を前記ＰＷＭインバータを介して空転中の誘導電動機に印加したときの一次電流リサージュが描く楕円の短軸／長軸の比率から誘導電動機の回転数を推定する誘導電動機の回転数推定方法において、
前記単相交流電圧の周波数のスイープ毎に前記電流リサージュのαβ軸成分から電流振幅を求める振幅演算ステップと、
前記電流振幅の最大値が基準値以上になるまで、前記ＰＷＭインバータのキャリア周波数を低減し、前記電流振幅の最大値が基準値以上になったときの回転数推定後にキャリア周波数を元の周波数に復帰させる周波数調節ステップと、
を有することを特徴とする誘導電動機の回転数推定方法。 Based on the voltage command converted by the two-phase / three-phase converter, the induction motor is controlled via the PWM inverter, and the single-phase AC voltage sweeping the frequency is applied to the idle induction motor via the PWM inverter. In the induction motor rotation speed estimation method for estimating the rotation speed of the induction motor from the ratio of the short axis / long axis of the ellipse drawn by the primary current Lissajous
An amplitude calculation step for obtaining a current amplitude from an αβ axis component of the current Lissajous for each frequency sweep of the single-phase AC voltage;
The carrier frequency of the PWM inverter is reduced until the maximum value of the current amplitude is equal to or higher than a reference value, and the carrier frequency is restored to the original frequency after the rotation speed is estimated when the maximum value of the current amplitude is equal to or higher than the reference value. A frequency adjustment step to return,
A method for estimating the number of revolutions of an induction motor.
JP2009076950A 2009-03-26 2009-03-26 Induction motor rotation speed estimation apparatus and estimation method Expired - Fee Related JP5278091B2 (en)

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