JP2002369597A - Method for detecting rotational speed of induction motor in free rotation, and method for restarting induction motor - Google Patents
Method for detecting rotational speed of induction motor in free rotation, and method for restarting induction motorInfo
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- JP2002369597A JP2002369597A JP2001171990A JP2001171990A JP2002369597A JP 2002369597 A JP2002369597 A JP 2002369597A JP 2001171990 A JP2001171990 A JP 2001171990A JP 2001171990 A JP2001171990 A JP 2001171990A JP 2002369597 A JP2002369597 A JP 2002369597A
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- Prior art keywords
- induction motor
- axis
- voltage
- command value
- rotation speed
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、運転中に停電な
どによって電力変換装置の交流出力が中断されて自由回
転状態にある誘導電動機の回転速度の検出方法と再起動
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a rotation speed and a method for restarting an induction motor in a free-rotation state in which an AC output of a power converter is interrupted due to a power failure or the like during operation.
【0002】[0002]
【従来の技術】誘導電動機は構造が簡単で頑丈であるこ
とから多用されているが、回転速度を変化させるのが困
難であったため、例えば長尺材を巻き取る巻取機の駆動
や電気車のように可変速運転をさせる必要がある用途に
は、従来は直流電動機を採用していたが、この直流電動
機は整流子などの構造上の弱点を抱えていることや高価
であるなどの欠点があるし、ブラシなどの消耗品の交換
や、整流子の保守・点検に手間がかかるなど、いろいろ
な不都合があった。2. Description of the Related Art Induction motors are widely used because of their simple structure and ruggedness. However, it has been difficult to change the rotation speed. Conventionally, DC motors are used for applications that require variable speed operation, but such DC motors have structural weaknesses such as commutators and are disadvantageous in that they are expensive. However, there were various inconveniences, such as replacement of consumables such as brushes and maintenance and inspection of commutators.
【0003】一方で半導体スイッチ素子の性能とこれの
利用技術はますます向上しており、電力変換装置として
のインバータ装置が出力する交流電力の電圧と周波数を
適切に制御することにより、誘導電動機を所望のトルク
と回転速度で運転させるのは極めて容易になってきてい
る。それ故近年では、可変電圧・可変周波数の交流電力
を出力するインバータ装置を電源にした誘導電動機の可
変速運転が、一般に採用されるようになっている。[0003] On the other hand, the performance of semiconductor switch elements and the technology of using them have been further improved, and by appropriately controlling the voltage and frequency of AC power output from an inverter as a power converter, an induction motor can be used. It has become extremely easy to operate at a desired torque and rotational speed. Therefore, in recent years, variable speed operation of an induction motor using an inverter device that outputs AC power of a variable voltage and a variable frequency as a power source has been generally adopted.
【0004】[0004]
【発明が解決しようとする課題】ところで、このインバ
ータ装置は商用電力を電源にしていることから、落雷や
配電線路の切り換えなどでインバータ装置への電力供給
が一時的に中断されることがあると、その間は誘導電動
機への電力供給が中断されることになるし、インバータ
装置が故障した場合も誘導電動機への電力供給は中断と
なる。この電力供給中断期間中では誘導電動機は自由回
転状態となるため、その回転速度は徐々に低下する。や
がて電源が回復すれば、当該誘導電動機は再び交流電力
の供給を受けて運転を再開することができるが、実際に
は電源が回復したからといって直ちに運転を再開させる
ことはできない。何故ならば、インバータ装置が出力す
る交流電力の周波数と電圧が、その時点での電動機の回
転速度に対応した値よりも大であると、インバータ装置
から電動機へ大きな突入電流が流れる不具合を生じる。
また、これとは逆にインバータ装置の出力電圧と周波数
が、その時点での電動機の回転速度に対応した値よりも
小であるならば、電動機からインバータ装置へ大きな回
生電流が流れる不具合を生じる。それ故、誘導電動機の
運転を再開するにあたっては、先ず当該誘導電動機のそ
の時点での回転速度を検出しておく必要がある。However, since this inverter device uses commercial power as a power source, the power supply to the inverter device may be temporarily interrupted due to lightning strikes or switching of distribution lines. In the meantime, power supply to the induction motor is interrupted, and power supply to the induction motor is also interrupted when the inverter device breaks down. During this power supply interruption period, the induction motor is in a free rotation state, and its rotation speed gradually decreases. When the power supply recovers soon, the induction motor can be restarted by receiving the supply of the AC power again. However, in practice, it is not possible to restart the operation immediately after the power supply is recovered. If the frequency and voltage of the AC power output from the inverter device are higher than the values corresponding to the rotation speed of the motor at that time, a problem occurs in which a large rush current flows from the inverter device to the motor.
Conversely, if the output voltage and frequency of the inverter device are smaller than the values corresponding to the rotation speed of the motor at that time, a problem occurs in which a large regenerative current flows from the motor to the inverter device. Therefore, when restarting the operation of the induction motor, it is necessary to first detect the current rotational speed of the induction motor.
【0005】誘導電動機は電源が遮断されてもその巻線
に電圧が残留するので、この残留電圧を利用すれば回転
速度を検出できる。しかしこの残留電圧は極く短時間で
消滅してしまうから、残留電圧消滅後でも当該誘導電動
機の時々刻々の回転速度が検出できるようにするため
に、速度発電機やパルスジェネレータなどの回転速度検
出手段を電動機に結合しておく必要がある。しかしなが
ら、このような回転速度検出手段を誘導電動機に取り付
けるためには、電動機の軸端を加工しなければならない
不具合があるし、これらを取り付けるスペースを確保す
るのが困難な場合も多い。そこで速度発電機やパルスジ
ェネレータを備えることができない場合は、停電により
自由回転状態になった電動機を一旦停止させてから運転
を再開させることになる。しかしごく短時間の停電であ
っても、その都度電動機が停止するまで待つのでは、運
転再開までの無駄時間が多くなって装置の稼働効率が低
下する不都合がある。特に遠心分離機のようにはずみ車
効果が大きい負荷を結合している場合は、停止までに長
時間を要するので実際的ではないし、手間もかかる不都
合がある。[0005] Since the voltage remains in the winding of the induction motor even when the power is cut off, the rotational speed can be detected by using the residual voltage. However, since this residual voltage disappears in a very short time, even after the residual voltage disappears, the rotational speed of a speed generator or a pulse generator is detected so that the rotational speed of the induction motor can be detected every moment. The means must be connected to the motor. However, in order to attach such a rotational speed detecting means to an induction motor, there is a problem that the shaft end of the motor must be machined, and it is often difficult to secure a space for attaching these. Therefore, when a speed generator or a pulse generator cannot be provided, the motor that has been in a free-rotation state due to a power failure is temporarily stopped and then restarted. However, even if the power is interrupted for a very short time, waiting until the motor stops every time has a disadvantage that the useless time until the restart of operation is increased and the operating efficiency of the device is reduced. In particular, when a load having a large flywheel effect is connected, such as a centrifuge, it takes a long time to stop, so it is not practical and requires much time and labor.
【0006】そこでこの発明の目的は、自由回転中の誘
導電動機の回転速度を、電動機に速度検出手段を結合せ
ずに検出し、検出した回転速度に対応した周波数と電圧
の交流電力を電動機に与えることで、ショックなしで運
転を再開出来るようにすることにある。Accordingly, an object of the present invention is to detect the rotation speed of an induction motor during free rotation without coupling speed detection means to the motor, and to provide the motor with AC power of a frequency and voltage corresponding to the detected rotation speed. The purpose is to allow driving to resume without shock.
【0007】[0007]
【課題を解決するための手段】前記の目的を達成するた
めに、この発明の自由回転中の誘導電動機の回転速度検
出方法と再起動方法は、可変電圧・可変周波数の交流電
力を出力して誘導電動機を駆動する電力変換装置の交流
出力が中断されて自由回転中の前記誘導電動機の回転速
度を検出する方法において、自由回転中の前記誘導電動
機へステップ状のトリガ電圧を与え、この誘導電動機か
ら該トリガ電圧との位相が90度異なる電流を検出し、
調節動作によりこの90度位相が異なる検出電流を零に
制御することにより、当該誘導電動機の回転速度情報を
得る。SUMMARY OF THE INVENTION In order to achieve the above object, a method for detecting the rotational speed of an induction motor during free rotation and a method for restarting the motor according to the present invention output AC power of a variable voltage and a variable frequency. In the method of detecting the rotation speed of the induction motor during free rotation by interrupting the AC output of the power conversion device for driving the induction motor, a step-like trigger voltage is applied to the induction motor during free rotation, Detects a current having a phase different from the trigger voltage by 90 degrees from
By controlling the detected currents having a phase difference of 90 degrees to zero by the adjustment operation, rotation speed information of the induction motor is obtained.
【0008】または、誘導電動機の電流・電圧を相互に
直行するd軸成分とq軸成分とに分離し、自由回転中の
前記誘導電動機へのq軸電圧指令値を零にしてd軸方向
にステップ状のトリガ電圧を与え、前記誘導電動機から
該トリガ電圧と位相が90度異なって流れるq軸電流を
検出し、このq軸電流検出値を零に制御する調節動作を
行うことで、当該誘導電動機の回転速度情報を得る。Alternatively, the current / voltage of the induction motor is separated into a d-axis component and a q-axis component that are orthogonal to each other, and the q-axis voltage command value to the induction motor during free rotation is reduced to zero to reduce the d-axis direction. By applying a step-like trigger voltage, detecting the q-axis current flowing from the induction motor with a phase difference of 90 degrees from the trigger voltage, and performing an adjusting operation of controlling the q-axis current detection value to zero, Obtain rotation speed information of the motor.
【0009】または、d軸電流指令値と当該誘導電動機
の一次抵抗との積からd軸電圧指令値を演算し、自由回
転中の前記誘導電動機へのq軸電圧指令値が零の状態
で、ステップ状の前記d軸電圧指令値をトリガ電圧とし
て与え、これとは位相が90度異なって流れるq軸電流
を零に制御する調節動作により回転速度情報を求め、当
該誘導電動機の再起動にこれらd軸電圧指令値と回転速
度情報を使用する。Alternatively, a d-axis voltage command value is calculated from a product of a d-axis current command value and a primary resistance of the induction motor, and in a state where the q-axis voltage command value to the induction motor during free rotation is zero, The step-shaped d-axis voltage command value is given as a trigger voltage, rotation speed information is obtained by an adjusting operation for controlling the q-axis current flowing at a phase difference of 90 degrees to zero, and these are obtained when the induction motor is restarted. The d-axis voltage command value and the rotation speed information are used.
【0010】または、誘導電動機の電流・電圧を相互に
直行するd軸成分とq軸成分とに分離し、d軸電流指令
値と当該誘導電動機の一次抵抗との積からd軸電圧指令
値を演算し、自由回転中の前記誘導電動機へのq軸電圧
指令値が零の状態で、ステップ状の前記d軸電圧指令値
をトリガ電圧として与えることで検出されるq軸電流を
零に制御する調節動作を行うことで当該誘導電動機の回
転速度情報を求め、これらd軸電圧指令値と回転速度情
報を当該誘導電動機の再起動に使用し、この回転速度情
報を所定の時間遅れと変化速度で、設定した回転速度指
令値へ切り換える。Alternatively, the current / voltage of the induction motor is separated into a d-axis component and a q-axis component that are orthogonal to each other, and the d-axis voltage command value is calculated from the product of the d-axis current command value and the primary resistance of the induction motor. In the state where the q-axis voltage command value to the induction motor during free rotation is zero, the q-axis current detected by applying the step-like d-axis voltage command value as a trigger voltage is controlled to zero. By performing the adjustment operation, the rotation speed information of the induction motor is obtained, and the d-axis voltage command value and the rotation speed information are used for restarting the induction motor, and the rotation speed information is used with a predetermined time delay and change speed. Switch to the set rotation speed command value.
【0011】[0011]
【発明の実施の形態】本発明の作用原理を以下に記述す
る。すなわち、誘導電動機がω2 なる角周波数で回転し
ているとき、その定常状態での電流電圧方程式は下記の
数式1に示す行列式で表すことができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle of operation of the present invention will be described below. That is, when the induction motor is rotating at an angular frequency of ω 2 , the current-voltage equation in its steady state can be represented by the following determinant in Equation 1.
【0012】[0012]
【数1】 但し、 Vd :一次電圧(d軸) Vq :一次電圧(q軸) Id :一次電流(d軸) Iq :一次電流(q軸) φ2d:二次磁束(d軸) φ2q:二次磁束(q軸) R1 :一次抵抗 R2 :二次抵抗 Lσ:漏れインダクタンス Lm:励磁インダクタンス ω1 :一次周波数 ω2 :回転速度 ωS :滑り周波数(ωS =ω1 −ω2 ) この数式1で表される特性方程式の近似解は、−(R2
/Lm)+jω2 となる。従ってω2 を周波数成分とし
て含んでいる電圧を印加すると、電流波形はこのω2 で
振動する。よって検出した一次電流Id またはIq が零
となるように座標軸を回転させれば、その回転周期から
誘導電動機の回転速度情報を得ることができる。Where V d : primary voltage (d-axis) V q : primary voltage (q-axis) I d : primary current (d-axis) I q : primary current (q-axis) φ 2d : secondary magnetic flux (d Axis) φ 2q : Secondary magnetic flux (q axis) R 1 : Primary resistance R 2 : Secondary resistance Lσ: Leakage inductance Lm: Exciting inductance ω 1 : Primary frequency ω 2 : Rotational speed ω S : Slip frequency (ω S = ω 1 −ω 2 ) The approximate solution of the characteristic equation represented by Expression 1 is − (R 2
/ Lm) + jω 2 to become. Therefore, when a voltage containing ω 2 as a frequency component is applied, the current waveform oscillates at ω 2 . Therefore, if the coordinate axis is rotated so that the detected primary current Id or Iq becomes zero, the rotation speed information of the induction motor can be obtained from the rotation cycle.
【0013】図1は本発明の第1実施例を表したフロー
チャートである。この図1において、電動機へステップ
状のトリガ電圧を印加(処理21)することにより、こ
の電動機からトリガ電圧とは位相が90度異なる電流を
検出(判断17)する。この90度位相が異なる電流を
零にする調節動作(処理23)の結果から、回転速度情
報(判断18)を得ることができる。FIG. 1 is a flowchart showing a first embodiment of the present invention. In FIG. 1, a step-like trigger voltage is applied to the motor (process 21), so that a current having a phase different from the trigger voltage by 90 degrees from the motor is detected (judgment 17). Rotational speed information (judgment 18) can be obtained from the result of the adjustment operation (step 23) for setting the currents having 90 ° phase differences to zero.
【0014】図2は本発明の第2実施例を表したブロッ
ク回路図である。この図2の回路において、三相交流電
源1からの三相交流電力は順変換器2で直流電力に変換
され、この直流電力は平滑コンデンサ3で平滑された
後、電圧形インバータ4で可変電圧・可変周波数の三相
交流電力に変換され、誘導電動機5を所望の回転速度で
駆動する。符号31は、別途に設定する周波数指令値ω
1 * を電圧指令値に変換するV/F変換器であり、第1
座標変換器32は、直流座標系の相互に直交する電圧指
令値Vq * とVd * を、交流座標系の電圧指令値
VU * ,VV * ,VW *に変換する。符号33はこの三
相電圧指令値を電圧形インバータ4のゲート信号に変換
するPWM(パルス幅変調)制御器であり、このPWM
制御器33で電圧形インバータ4を制御することで、誘
導電動機5を所望のトルクと回転速度で駆動することが
できる。FIG. 2 is a block circuit diagram showing a second embodiment of the present invention. In the circuit of FIG. 2, the three-phase AC power from the three-phase AC power supply 1 is converted into DC power by a forward converter 2, this DC power is smoothed by a smoothing capacitor 3, -It is converted into three-phase AC power of variable frequency, and drives the induction motor 5 at a desired rotation speed. Reference numeral 31 denotes a separately set frequency command value ω
This is a V / F converter that converts 1 * into a voltage command value.
Coordinate converter 32, a voltage command value V q * and V d * mutually orthogonal DC coordinate system, the voltage command value of the AC coordinate system V U *, V V *, converted to V W *. Reference numeral 33 denotes a PWM (pulse width modulation) controller which converts the three-phase voltage command value into a gate signal of the voltage source inverter 4.
By controlling the voltage source inverter 4 by the controller 33, the induction motor 5 can be driven at a desired torque and rotation speed.
【0015】電流検出器6で検出された交流電流検出値
IU ,IW は、第2座標変換器34で直流座標系の電流
検出値に変換される。符号35はq軸電流検出値I
q を、別途に設定するq軸電流指令値Iq * に一致させ
る電流調節器であり、周波数切換器36は電流調節器3
5の調節動作により得られる回転速度情報ωと、前述の
周波数指令値ω1 * との切り換えを行う。また積分器3
7は積分演算により周波数を角度θへ変換する。The AC current detection values I U and I W detected by the current detector 6 are converted by the second coordinate converter 34 into current detection values in the DC coordinate system. Reference numeral 35 indicates the q-axis current detection value I.
q is a current controller that matches q-axis current command value I q * set separately, and frequency switch 36 is a current controller 3
The switching between the rotational speed information ω obtained by the adjustment operation of No. 5 and the above-described frequency command value ω 1 * is performed. Integrator 3
7 converts the frequency into an angle θ by an integration operation.
【0016】本発明ではトリガ電圧発生器38が設けら
れており、V/F変換器31が出力するq軸電圧指令値
Vq * が零のときに、トリガ電圧発生器38によりd軸
方向にステップ状のトリガ電圧Vd * を発生させる。こ
のトリガ電圧Vd * により、これとは位相が90度ずれ
たq軸方向の電流Iq を第2座標変換器34から取り出
すことができ、このq軸電流指令値Iq * =0とするこ
とで、電流調節器35は、その調節動作によりq軸電流
検出値Iq を零にする。このときの電流調節器35の出
力値ωが、その時点での誘導電動機5の回転速度情報で
ある。In the present invention, the trigger voltage generator 38 is provided, and when the q-axis voltage command value V q * output from the V / F converter 31 is zero, the trigger voltage generator 38 causes the trigger voltage generator 38 to move in the d-axis direction. A step-like trigger voltage V d * is generated. Due to the trigger voltage V d * , a current I q in the q-axis direction having a phase shifted by 90 degrees from the trigger voltage V d * can be extracted from the second coordinate converter 34, and the q-axis current command value I q * = 0. Thus, the current adjuster 35 sets the q-axis current detection value Iq to zero by the adjusting operation. The output value ω of the current controller 35 at this time is the rotation speed information of the induction motor 5 at that time.
【0017】図3は本発明の第3実施例を表した動作波
形図であって、図2で既述の第2実施例回路に記載のト
リガ電圧発生器38が出力する電圧波形を表している。
すなわちトリガ電圧Vd * として、d軸方向の電流指令
値Id * に誘導電動機5の一次抵抗R1 を乗じた値を採
用する。これにより、自由回転中の電動機の回転速度検
出状態と、通常の運転状態における無効電圧指令値Vd
* とを同一にすることができる。FIG. 3 is an operation waveform diagram showing a third embodiment of the present invention, and shows a voltage waveform output from the trigger voltage generator 38 described in the circuit of the second embodiment described above with reference to FIG. I have.
That is, as the trigger voltage V d *, adopting the value obtained by multiplying the primary resistance R 1 of the induction motor 5 to the current command value of the d-axis direction I d *. As a result, the rotation speed detection state of the motor during free rotation and the invalid voltage command value V d in the normal operation state
* And can be the same.
【0018】図4は本発明の第4実施例を表したブロッ
ク回路図であるが、この第4実施例回路は、図2で既述
の第2実施例回路に第2周波数切換器41を付加してい
るのが異なるが、それ以外は全て第2実施例回路と同じ
であるから、同じ部分の説明は省略する。誘導電動機5
が自由回転中でその回転速度を演算しているとき、周波
数切換器36は電流調節器35が出力する回転速度情報
ωを出力し、回転速度演算から通常運転へは第2周波数
切換器41が出力する周波数指令値ω1 * に切り換わっ
て、これを出力する。ここで回転速度演算中は回転速度
情報ωが第2周波数切換器41へも与えられており、回
転速度演算から通常運転への切り換え時のショックを緩
和するために、第2周波数切換器41に内蔵されている
フィルタや加減速度演算器にこの回転速度情報ωをセッ
トする。またV/F変換器31には誘導電動機5の磁束
モデルを内蔵させていて、その変換係数を誘導電動機5
の二次時定数で変化させている。それ故回転速度演算か
ら通常運転への切り換え時には回転速度情報ωを元にし
て起動することになり、自由回転中の誘導電動機5にシ
ョックを与えること無しに起動させることができる。FIG. 4 is a block circuit diagram showing a fourth embodiment of the present invention. This fourth embodiment circuit is different from the second embodiment circuit shown in FIG. The difference is that they are added, but the rest is the same as the circuit of the second embodiment, so that the description of the same parts will be omitted. Induction motor 5
Is in free rotation and its rotation speed is calculated, the frequency switch 36 outputs the rotation speed information ω output from the current controller 35, and the second frequency switch 41 is switched from the rotation speed calculation to the normal operation. Switch to the frequency command value ω 1 * to be output, and output this. Here, during the rotation speed calculation, the rotation speed information ω is also supplied to the second frequency switch 41, and the second frequency switch 41 is provided to the second frequency switch 41 in order to reduce a shock at the time of switching from the rotation speed calculation to the normal operation. The rotational speed information ω is set in a built-in filter or an acceleration / deceleration calculator. The V / F converter 31 has a built-in magnetic flux model of the induction motor 5, and converts the conversion coefficient of the induction motor 5.
Is changed by the second order time constant. Therefore, when the operation is switched from the rotation speed calculation to the normal operation, the operation is started based on the rotation speed information ω, and the induction motor 5 during the free rotation can be started without giving a shock.
【0019】[0019]
【発明の効果】力行運転中の誘導電動機へ電力を供給し
ている電源が停電すると、停電期間中にその回転速度が
低下するので、電源が復旧したときの誘導電動機の回転
速度が不明だと、適切な値の電圧と周波数の交流電力を
誘導電動機に与えることができない。そこで従来は、誘
導電動機にパルスジェネレータなどの回転速度検出手段
を結合しておく必要があった。しかしパルスジェネレー
タを取り付けるために電動機軸端の加工や取り付けスペ
ースを確保する必要があった。これに対して本発明で
は、自由回転中の誘導電動機へステップ状のトリガ電圧
を与えて、このトリガ電圧とは位相が90度異なる電流
を前記誘導電動機から検出する。調節動作により位相が
90度異なる前記検出電流を零に制御することにで、当
該誘導電動機の回転速度情報を得ることができるので、
自由回転中の誘導電動機の残留電圧が零であっても、パ
ルスジェネレータなどを使用せずにその回転速度が容易
に検出できる効果が得られるし、回転速度検出演算から
通常運転へショックを与えずに切り換えることができる
効果も得られる。According to the present invention, if the power supply that supplies power to the induction motor during the power running operation fails, the rotation speed of the induction motor decreases during the power failure period. Therefore, if the rotation speed of the induction motor when the power is restored is unknown. In addition, it is impossible to supply an AC power having an appropriate voltage and frequency to the induction motor. Therefore, conventionally, it has been necessary to connect a rotation speed detecting means such as a pulse generator to the induction motor. However, in order to mount the pulse generator, it was necessary to secure the machining and mounting space for the shaft end of the motor. On the other hand, in the present invention, a step-like trigger voltage is applied to the induction motor that is rotating freely, and a current having a phase that differs from the trigger voltage by 90 degrees is detected from the induction motor. By controlling the detection current having a phase difference of 90 degrees to zero by the adjusting operation to zero, the rotation speed information of the induction motor can be obtained.
Even if the residual voltage of the induction motor during free rotation is zero, the effect that the rotation speed can be easily detected without using a pulse generator or the like is obtained, and the rotation speed detection calculation does not give a shock to normal operation. Is also obtained.
【図1】本発明の第1実施例を表したフローチャートFIG. 1 is a flowchart showing a first embodiment of the present invention.
【図2】本発明の第2実施例を表したブロック回路図FIG. 2 is a block circuit diagram showing a second embodiment of the present invention.
【図3】本発明の第3実施例を表した動作波形図FIG. 3 is an operation waveform diagram showing a third embodiment of the present invention.
【図4】本発明の第4実施例を表したブロック回路図FIG. 4 is a block circuit diagram showing a fourth embodiment of the present invention.
1 三相交流電源 2 順変換器 3 平滑コンデンサ 4 電圧形インバータ 5 誘導電動機 6 電流検出器 17,18 判断 21,23 処理 31 V/F変換器 32 第1座標変換器 33 PWM制御器 34 第2座標変換器 35 電流調節器 36 周波数切換器 37 積分器 38 トリガ電圧発生器 41 第2周波数切換器 DESCRIPTION OF SYMBOLS 1 Three-phase AC power supply 2 Forward converter 3 Smoothing capacitor 4 Voltage source inverter 5 Induction motor 6 Current detector 17, 18 Judgment 21, 23 Processing 31 V / F converter 32 First coordinate converter 33 PWM controller 34 Second Coordinate converter 35 Current controller 36 Frequency switch 37 Integrator 38 Trigger voltage generator 41 Second frequency switch
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 究 神奈川県川崎市川崎区田辺新田1番1号 富士電機株式会社内 Fターム(参考) 5H576 AA20 BB09 BB10 CC05 DD02 DD04 EE01 EE11 EE22 FF01 FF02 FF07 GG04 GG07 HA01 HB02 JJ03 JJ06 JJ15 JJ17 KK06 LL14 LL22 LL34 MM02 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuki Suzuki 1-1-1 Tanabe Shinda, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Fuji Electric Co., Ltd. (Reference) 5H576 AA20 BB09 BB10 CC05 DD02 DD04 EE01 EE11 EE22 FF01 FF02 FF07 GG04 GG07 HA01 HB02 JJ03 JJ06 JJ15 JJ17 KK06 LL14 LL22 LL34 MM02
Claims (4)
て誘導電動機を駆動する電力変換装置の交流出力が中断
されて自由回転中の前記誘導電動機の回転速度を検出す
る方法において、 自由回転中の前記誘導電動機へステップ状のトリガ電圧
を与え、 前記誘導電動機から該トリガ電圧との位相が90度異な
る電流を検出し、 この位相が90度異なる検出電流を零に制御する調節動
作を行い、 この調節動作から当該誘導電動機の回転速度情報を得る
ことを特徴とする自由回転中の誘導電動機の回転速度検
出方法。1. A method for detecting a rotation speed of an induction motor during free rotation by interrupting an AC output of a power converter for driving an induction motor by outputting AC power of a variable voltage and a variable frequency. Applying a step-like trigger voltage to the induction motor inside, detecting a current having a phase different from the trigger voltage by 90 degrees from the induction motor, and performing an adjusting operation for controlling the detected current having a phase different from the phase by 90 degrees to zero. A method for detecting a rotation speed of an induction motor during free rotation, wherein rotation speed information of the induction motor is obtained from the adjustment operation.
て誘導電動機を駆動する電力変換装置の交流出力が中断
されて自由回転中の前記誘導電動機の回転速度を検出す
る方法において、 誘導電動機の電流・電圧を相互に直行するd軸成分とq
軸成分とに分離し、 自由回転中の前記誘導電動機へのq軸電圧指令値が零の
状態で、d軸方向にステップ状のトリガ電圧を与え、 前記誘導電動機から該トリガ電圧と位相が90度異なっ
て流れるq軸電流を検出し、 このq軸電流検出値を零に制御する調節動作を行うこと
で、当該誘導電動機の回転速度情報を得ることを特徴と
する自由回転中の誘導電動機の回転速度検出方法。2. A method for detecting a rotation speed of said induction motor during free rotation by interrupting an AC output of a power converter for driving an induction motor by outputting AC power of a variable voltage and a variable frequency. D-axis component and q
When the q-axis voltage command value to the induction motor during free rotation is zero, a step-like trigger voltage is applied in the d-axis direction, and the phase of the trigger voltage and the phase from the induction motor are 90 The rotation of the induction motor during free rotation is characterized by detecting a q-axis current flowing at different degrees and performing an adjusting operation for controlling the detected value of the q-axis current to zero to obtain rotation speed information of the induction motor. Rotation speed detection method.
て誘導電動機を駆動する電力変換装置の交流出力が中断
されて自由回転中の前記誘導電動機を再起動させる方法
において、 誘導電動機の電流・電圧を相互に直行するd軸成分とq
軸成分とに分離し、 d軸電流指令値と当該誘導電動機の一次抵抗との積から
d軸電圧指令値を演算し、 自由回転中の前記誘導電動機へのq軸電圧指令値が零の
状態で、ステップ状の前記d軸電圧指令値をトリガ電圧
として与え、 前記誘導電動機から該トリガ電圧と位相が90度異なっ
て流れるq軸電流を検出し、 このq軸電流検出値を零に制御する調節動作を行うこと
で当該誘導電動機の回転速度情報を求め、 当該誘導電動機の再起動にこれらd軸電圧指令値と回転
速度情報を使用することを特徴とする自由回転中の誘導
電動機の再起動方法。3. A method for restarting the induction motor during free rotation by interrupting the AC output of a power converter that drives an induction motor by outputting AC power of a variable voltage and a variable frequency, comprising: The d-axis component and q that are orthogonal to each other
The d-axis voltage command value is calculated from the product of the d-axis current command value and the primary resistance of the induction motor, and the q-axis voltage command value to the induction motor during free rotation is zero. Then, the step-shaped d-axis voltage command value is given as a trigger voltage, a q-axis current flowing from the induction motor at a phase different from the trigger voltage by 90 degrees is detected, and the q-axis current detection value is controlled to zero. The rotational speed information of the induction motor is obtained by performing the adjusting operation, and the d-axis voltage command value and the rotation speed information are used for restarting the induction motor. Method.
て誘導電動機を駆動する電力変換装置の交流出力が中断
されて自由回転中の前記誘導電動機を再起動させる方法
において、 誘導電動機の電流・電圧を相互に直行するd軸成分とq
軸成分とに分離し、 d軸電流指令値と当該誘導電動機の一次抵抗との積から
d軸電圧指令値を演算し、 自由回転中の前記誘導電動機へのq軸電圧指令値が零の
状態で、ステップ状の前記d軸電圧指令値をトリガ電圧
を与え、 前記誘導電動機から該トリガ電圧と位相が90度異なっ
て流れるq軸電流を検出し、 このq軸電流検出値を零に制御する調節動作を行うこと
で当該誘導電動機の回転速度情報を求め、 これらd軸電圧指令値と回転速度情報を当該誘導電動機
の再起動に使用し、 この回転速度情報を所定の時間遅れと変化速度で、設定
した回転速度指令値へ切り換えることを特徴とする自由
回転中の誘導電動機の再起動方法。4. A method of restarting the induction motor during free rotation by interrupting the AC output of a power converter that drives an induction motor by outputting AC power of a variable voltage and a variable frequency, the method comprising: The d-axis component and q that are orthogonal to each other
The d-axis voltage command value is calculated from the product of the d-axis current command value and the primary resistance of the induction motor, and the q-axis voltage command value to the induction motor during free rotation is zero. Then, a trigger voltage is applied to the step-shaped d-axis voltage command value, a q-axis current flowing from the induction motor at a phase different from the trigger voltage by 90 degrees is detected, and the q-axis current detection value is controlled to zero. By performing the adjusting operation, the rotation speed information of the induction motor is obtained, the d-axis voltage command value and the rotation speed information are used for restarting the induction motor, and the rotation speed information is used with a predetermined time delay and change speed. A method of restarting an induction motor during free rotation, wherein the method is switched to a set rotation speed command value.
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JP2001171990A JP4380089B2 (en) | 2001-06-07 | 2001-06-07 | Rotation speed detection method and restart method of induction motor during free rotation |
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JP2001171990A JP4380089B2 (en) | 2001-06-07 | 2001-06-07 | Rotation speed detection method and restart method of induction motor during free rotation |
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