JPH06165582A - Inverter unit - Google Patents

Inverter unit

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Publication number
JPH06165582A
JPH06165582A JP4310047A JP31004792A JPH06165582A JP H06165582 A JPH06165582 A JP H06165582A JP 4310047 A JP4310047 A JP 4310047A JP 31004792 A JP31004792 A JP 31004792A JP H06165582 A JPH06165582 A JP H06165582A
Authority
JP
Japan
Prior art keywords
induction motor
current
inverter
value
phase
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.)
Granted
Application number
JP4310047A
Other languages
Japanese (ja)
Other versions
JP2980469B2 (en
Inventor
Hiroshi Mochikawa
宏 餅川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP4310047A priority Critical patent/JP2980469B2/en
Publication of JPH06165582A publication Critical patent/JPH06165582A/en
Application granted granted Critical
Publication of JP2980469B2 publication Critical patent/JP2980469B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Ac Motors In General (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

PURPOSE:To obtain an inverter unit producing deceleration energy, higher than that produced through DC brake system, required for emergency stop of an induction motor rotating at high speed without requiring any resistor for discharging regenerated energy or regeneration of power supply. CONSTITUTION:If a current detection value I outputted from an absolute value rectifying circuit 11 is lower than a current limit level Oc and a DC link voltage detection value Vdc is lower than a DC link voltage limit level Ov when emergency stop is required for an induction motor 10 rotating at high speed, output arm of inverter is switched to circulation state and integration of voltage phase is stopped simultaneously. Consequently, deceleration torque can be increased steeply while sustaining a constant flux in the induction motor 10 and thereby a limit current causing no overcurrent of inverter can be fed continuously and stably.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は誘導電動機を電圧形PW
Mインバータで駆動するインバータ装置に係り、特に急
速停止制御を行うインバータ装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an inverter device driven by an M inverter, and particularly to an inverter device that performs quick stop control.

【0002】[0002]

【従来の技術】従来、インバータ装置の急速停止制御法
には、誘導電動機に直流を印加する方式や、インバータ
の出力周波数を除々に減少させる方式があった。この直
流を印加する方式とは、以下の様な方式である。
2. Description of the Related Art Conventionally, as a method of controlling a rapid stop of an inverter device, there are a method of applying a direct current to an induction motor and a method of gradually decreasing an output frequency of an inverter. The method of applying the direct current is as follows.

【0003】誘導電動機を電源から切りはなし、1次側
の端子VとWとを結び、他の端子Uとの間に直流電圧を
加えて励磁すると、一次巻線によって作られていた回転
磁極に代って、固定した磁極ができる。そのため、誘導
電動機は回転電機子形交流発電機となる。その発生した
交流電力を巻線形回転子ならば、2次端子間に接続した
加減抵抗器で消費させ、また、かご形回転子ならばかご
形巻線内で消費させて、誘導電動機を制動する。
When the induction motor is not turned off from the power source and the terminals V and W on the primary side are connected and a DC voltage is applied to the other terminal U to excite it, the rotating magnetic pole formed by the primary winding is changed. Instead, a fixed magnetic pole is created. Therefore, the induction motor is a rotating armature type AC generator. If the generated AC power is a winding type rotor, it will be consumed by the adjusting resistor connected between the secondary terminals, and if it is a squirrel cage rotor, it will be consumed in the squirrel cage winding to brake the induction motor. .

【0004】これは、回転中の誘導電動機の1次巻線の
3つの端子のうち、任意の2つの端子の接続を電源に対
し入れ換えると、相回転の順序が反対になって、回転子
に働くトルクの方向は逆になるので、誘導電動機は、制
動されて、急速に減速するのである。
This is because, if the connection of any two terminals of the three terminals of the primary winding of the rotating induction motor is switched to the power source, the order of phase rotation is reversed and the rotor is rotated. Since the direction of the acting torque is opposite, the induction motor is braked and rapidly decelerated.

【0005】また、インバータの出力周波数を除々に減
少させる方式とは、誘導電動機を電源に接続したまま、
インバータの出力周波数を除々に減少させて、同期速度
以上の速度で誘導電動機を運転し、誘導発電機として働
かせ、その発生した電力を電源に回生しながら制動する
方式である。
In addition, the method of gradually decreasing the output frequency of the inverter means that the induction motor is connected to the power source,
This is a method in which the output frequency of the inverter is gradually decreased, the induction motor is operated at a speed equal to or higher than the synchronous speed, the induction motor is made to work, and the generated electric power is regenerated to the power source for braking.

【0006】[0006]

【発明が解決しようとする課題】誘導電動機に直流を印
加する方式で高速回転中の誘導電動機を急速停止する場
合には、誘導電動機内部の磁束を低下させる必要があ
る。そのため、これに必要な時間は数百msecにもなり、
この間は誘導電動機はフリーラン状態となる無駄な時間
であった。また、高速回転時には十分な減速トルクが発
生しないという問題点も有った。
In order to rapidly stop the induction motor that is rotating at high speed by applying a direct current to the induction motor, it is necessary to reduce the magnetic flux inside the induction motor. Therefore, the time required for this is several hundred msec,
During this time, the induction motor was a wasteful time in which it was in a free-run state. Further, there is a problem that sufficient deceleration torque is not generated during high speed rotation.

【0007】また、インバータの出力周波数を除々に減
少させる方式で高速回転中の誘導電動機を急速停止する
場合には、回転エネルギーが電気エネルギーに変換され
て、インバータ直流リンク部のコンデンサに蓄積する。
そのため、電源回生機能やコンデンサの電荷を放電させ
る回路が無い場合には、過電圧となってしまう。これを
防ぐために過電圧となった場合に出力周波数を減少させ
ないような制御をしたとしても、電動機電流を高いレベ
ルで安定に流し続けることができないため十分な減速ト
ルクが得られない問題点があった。この従来のインバ−
タ装置により高速回転中の誘導電動機を緊急停止させた
時の計算機シュミレーションを図3は示している。図に
おいて電動機線電流が大きくなる前に直流リンク電流が
許容値に達しており、このため出力周波数の減少を停止
し出力周波数を維持するため十分な減速トルクが得られ
ていないのがわかる。
Further, when the induction motor that is rotating at a high speed is rapidly stopped by the method of gradually decreasing the output frequency of the inverter, the rotational energy is converted into electric energy and stored in the capacitor of the inverter DC link section.
Therefore, if there is no power regeneration function or a circuit for discharging the electric charge of the capacitor, an overvoltage will occur. In order to prevent this, even if control is performed so that the output frequency is not reduced when an overvoltage occurs, there is a problem that sufficient deceleration torque cannot be obtained because the motor current cannot continue to flow stably at a high level. . This conventional Inver
FIG. 3 shows a computer simulation when an induction motor that is rotating at a high speed is emergency stopped by a computer device. In the figure, it can be seen that the DC link current reaches the allowable value before the motor line current becomes large, so that the deceleration torque is not sufficient to stop the output frequency from decreasing and maintain the output frequency.

【0008】このため、急速に停止する必要がある時に
は、構成の簡単なコンデンサ電荷放電回路を設けるのが
一般的である。しかし、この場合でも運転と急速停止を
繰り返すことで、インバータ装置内部の放電抵抗器の発
熱による盤内気温の上昇という不具合が生じる。
For this reason, when it is necessary to stop the battery rapidly, it is common to provide a capacitor charge discharging circuit having a simple structure. However, even in this case, by repeating the operation and the rapid stop, there is a problem that the temperature inside the panel rises due to the heat generation of the discharge resistor inside the inverter device.

【0009】そこで、本発明の目的は、誘導電動機を電
圧形PWMインバータで駆動するインバータ装置におい
て、高速回転中の誘導電動機を急速停止させる必要が生
じた場合に、電源回生機能やコンデンサの電荷を放電さ
せる回路を用いることなく、速やかに誘導電動機を減速
停止させるこのできるインバータ装置を提供するにあ
る。
Therefore, an object of the present invention is to provide a power source regeneration function and a charge for a capacitor in an inverter device for driving an induction motor with a voltage-type PWM inverter when it is necessary to rapidly stop the induction motor during high-speed rotation. It is an object of the present invention to provide an inverter device capable of quickly decelerating and stopping an induction motor without using a circuit for discharging.

【0010】[0010]

【課題を解決するための手段】以上の目的を達成するた
めに、誘導電動機を電圧形PWMインバータで駆動する
インバータ装置において、誘導電動機の減速開始後、イ
ンバータ出力電流の検出値が所定の電流制限値を越えて
いないことを判定する電流値判定手段と、前記検出値が
所定の電流制限値を越えていないと電流値判定手段が判
定すると、インバータ出力PWM電圧の位相の進行を停
止する位相制御手段と、前記検出値が所定の電流制限値
を越えていないと電流値判定手段が判定すると、インバ
ータ出力アームを還流状態へ切換えるアーム切換手段
と、を有することを特徴とするものである。
In order to achieve the above object, in an inverter device that drives an induction motor with a voltage-type PWM inverter, the detected value of the inverter output current is a predetermined current limit after deceleration of the induction motor is started. Current value determining means for determining that the current value does not exceed the value, and phase control for stopping the advance of the phase of the inverter output PWM voltage when the current value determining means determines that the detected value does not exceed the predetermined current limit value. Means and arm switching means for switching the inverter output arm to the return state when the current value determination means determines that the detected value does not exceed a predetermined current limit value.

【0011】[0011]

【作用】上記手段により、高速回転中の誘導電動機を緊
急停止させる必要が生じた場合でも、誘導電動機内部の
磁束を一定に保ったままで、減速トルクを急峻に増加さ
せる事ができ、かつインバータが過電流にならない限界
電流を安定に流し続けることで、誘導電動機の一次銅損
及び二次銅損を最大にでき、これにより回転エネルギー
を有効に消費させることが可能となり、大きな減速トル
クを発生できる。
By the above means, even when it is necessary to make an emergency stop of the induction motor during high-speed rotation, the deceleration torque can be rapidly increased while the magnetic flux inside the induction motor is kept constant, and the inverter By continuously flowing the limiting current that does not cause overcurrent, it is possible to maximize the primary copper loss and secondary copper loss of the induction motor, which makes it possible to effectively consume rotational energy and generate a large deceleration torque. .

【0012】[0012]

【実施例】本発明の実施例を図面を参照して説明する。Embodiments of the present invention will be described with reference to the drawings.

【0013】図1は実施例を示すインバータ装置におけ
る主回路の概略的構成図である。1は正側直流母線Pで
あり、2は負側直流母線Nである。3は主回路コンデン
サであり、主回路コンデンサ3は、直流母線PN間に配
置され、直流母線PN間の電圧を保持する働きを持つ。
4はU相正側主スイッチング素子、5はU相負側主スイ
ッチング素子、6はV相正側主スイッチング素子、7は
V相負側主スイッチング素子、8はW相正側主スイッチ
ング素子、9はW相負側主スイッチング素子、である。
U相正側主スイッチング素子4とU相負側主スイッチン
グ素子5、V相正側主スイッチング素子6とV相負側主
スイッチング素子7、W相正側主スイッチング素子8と
W相負側主スイッチング素子9は、相補的に動作し、片
方がオンの時はもう片方がオフとなる。10は誘導電動
機であり、誘導電動機10の端子電位は、正側直流母線
1または負側直流母線2のいずれかになる。
FIG. 1 is a schematic configuration diagram of a main circuit in an inverter device showing an embodiment. Reference numeral 1 is a positive-side DC bus P, and 2 is a negative-side DC bus N. Reference numeral 3 denotes a main circuit capacitor, which is arranged between the DC bus lines PN and has a function of holding a voltage between the DC bus lines PN.
4 is a U phase positive side main switching element, 5 is a U phase negative side main switching element, 6 is a V phase positive side main switching element, 7 is a V phase negative side main switching element, 8 is a W phase positive side main switching element, Reference numeral 9 is a W-phase negative side main switching element.
U-phase positive side main switching element 4 and U-phase negative side main switching element 5, V-phase positive side main switching element 6 and V-phase negative side main switching element 7, W-phase positive side main switching element 8 and W-phase negative side main The switching elements 9 operate complementarily, and when one is on, the other is off. Reference numeral 10 denotes an induction motor, and the terminal potential of the induction motor 10 is either the positive side DC bus 1 or the negative side DC bus 2.

【0014】11は絶対値整流回路であり、絶対値整流
回路11は、インバータの出力側即ち誘導電動機10に
流れる電動機電流の各相電流を2相または3相で検出し
て、このうちの絶対値が最大なものを抽出し、これを電
流検出値Iとして出力する。
Reference numeral 11 denotes an absolute value rectification circuit. The absolute value rectification circuit 11 detects each phase current of the motor current flowing through the output side of the inverter, that is, the induction motor 10 in two or three phases, and detects the absolute value of the two. The one with the maximum value is extracted and output as the current detection value I.

【0015】12は比較器であり、この比較器12に入
力される電流制限レベルOc と電流検出値Iを比較し、
電流検出値Iが電流制限レベルOc を越えない場合に
は、比較器12から電流低下信号S1 が出力される。な
お、電流制限レベルOc は、インバータの過電流保護レ
ベルよりいく分低い値に設定する。
Reference numeral 12 is a comparator, which compares the current limit level Oc input to the comparator 12 with the current detection value I,
When the detected current value I does not exceed the current limit level Oc, the comparator 12 outputs the current decrease signal S1. The current limit level Oc is set to a value somewhat lower than the overcurrent protection level of the inverter.

【0016】13は直流リンク電圧検出器であり、直流
リンク電圧検出値Vdcを出力する。14は比較器であ
り、この比較器12に入力される直流リンク電圧検出値
Vdcと直流リンク電圧制限レベルOv を比較し、直流リ
ンク電圧検出値Vdcが直流リンク電圧制限レベルOv を
越えない場合には比較器14から電圧低下信号S2 が出
力される。
A DC link voltage detector 13 outputs a DC link voltage detection value Vdc. Reference numeral 14 denotes a comparator, which compares the DC link voltage detection value Vdc input to the comparator 12 with the DC link voltage limit level Ov, and when the DC link voltage detection value Vdc does not exceed the DC link voltage limit level Ov. The comparator 14 outputs the voltage drop signal S2.

【0017】15はAND回路であり、このAND回路
15に電流低下信号S1 と電圧低下信号S2 がともに出
力されている場合に還流状態切換信号S3 を出力する。
この還流状態切換信号S3 は制御回路16に入力され
る。制御回路16は、還流状態切換え信号S3 が入力さ
れない場合にはPWM信号を発生させて、主回路スイッ
チング素子4〜9を駆動している。還流状態切換信号S
3 が制御回路16に入力されると、制御回路16は、主
回路スイッチング素子4〜9のうち、正側のU相正側主
スイッチング素子4、V相正側主スイッチング素子6、
W相正側主スイッチング素子8、をオン、U相負側主ス
イッチング素子5、V相負側主スイッチング素子7、W
相負側主スイッチング素子9をオフして誘導電動機10
の端子間を短絡させ、これと同時にPWM信号を発生す
るための位相角の進行を停止させる。これにより、誘導
電動機10は零周波数でかつ、零電圧の状態となり、急
速に減速トルクが発生する。
Reference numeral 15 is an AND circuit, which outputs a return state switching signal S3 when the current reduction signal S1 and the voltage reduction signal S2 are both output to the AND circuit 15.
This recirculation state switching signal S3 is input to the control circuit 16. The control circuit 16 drives the main circuit switching elements 4 to 9 by generating a PWM signal when the reflux state switching signal S3 is not input. Return state switching signal S
When 3 is input to the control circuit 16, the control circuit 16 causes the positive-side U-phase positive-side main switching element 4, the V-phase positive-side main switching element 6, among the main-circuit switching elements 4 to 9
The W-phase positive side main switching element 8 is turned on, the U-phase negative side main switching element 5, the V-phase negative side main switching element 7, W
The negative side main switching element 9 is turned off and the induction motor 10 is turned on.
, And the progress of the phase angle for generating the PWM signal is stopped at the same time. As a result, the induction motor 10 is in a zero voltage and zero voltage state, and deceleration torque is rapidly generated.

【0018】本実施例によれば、緊急停止指令が発生し
た場合、直流リンク電圧が過大でなく、電動機電流が過
大でない時は、インバータ出力を還流状態にし、PWM
波形制御をその時点で停止させる。その後、電動機電流
が過大になった場合には、停止していたPWM波形制御
を再起させ、インバータ出力を通常状態に戻す。これら
の一連のシーケンスが減速中に繰り変えされることで、
強力な制動力が発生する。
According to this embodiment, when an emergency stop command is issued and the DC link voltage is not excessive and the motor current is not excessive, the inverter output is brought into the return state and the PWM
Stop waveform control at that point. Then, when the electric motor current becomes excessive, the stopped PWM waveform control is restarted and the inverter output is returned to the normal state. By repeating these series of sequences during deceleration,
Strong braking force is generated.

【0019】なお、本実施例においては、制御回路16
は、主回路スイッチング素子4〜9のうち、正側の主回
路スイッチング素子4、6、8をオン、負側の主回路ス
イッチング素子5、7、9をオフして誘導電動機10の
端子間を短絡させたが、逆に正側の主回路スイッチング
素子4、6、8をオフ、負側の主回路スイッチング素子
5、7、9をオンさせて誘導電動機10の端子間を短絡
させても良い。
In this embodiment, the control circuit 16
Among the main circuit switching elements 4 to 9, the positive side main circuit switching elements 4, 6 and 8 are turned on and the negative side main circuit switching elements 5, 7 and 9 are turned off to connect the terminals of the induction motor 10. Although short-circuited, conversely, the positive side main circuit switching elements 4, 6, 8 may be turned off and the negative side main circuit switching elements 5, 7, 9 may be turned on to short-circuit the terminals of the induction motor 10. .

【0020】図2は、本発明の実施例における高速回転
中の誘導電動機の緊急停止動作時の計算機シミュレーシ
ョン結果である。同図によれば、電動機線電流Iuが許
容値以内におさえられ、かつ直流リンク電圧検出値Vdc
も許容以内に収まっている状態でも、急速に減速できる
ことがわかる。
FIG. 2 is a computer simulation result during an emergency stop operation of the induction motor during high speed rotation in the embodiment of the present invention. According to the figure, the motor line current Iu is suppressed within the allowable value, and the DC link voltage detection value Vdc
It can be seen that even when the value is within the allowable range, the speed can be rapidly reduced.

【0021】図3に示す従来のインバ−タ装置おける高
速回転中の誘導電動機の緊急停止動作時の計算機シミュ
レーション結果では1.2秒要した減速時間が、図2に
示す本発明の実施例では、0.3秒に低減している。
In the conventional inverter device shown in FIG. 3, the deceleration time required 1.2 seconds in the computer simulation result at the time of the emergency stop operation of the induction motor during high-speed rotation, in the embodiment of the present invention shown in FIG. , 0.3 seconds.

【0022】本実施例によれば、電流検出値Iが電流制
限レベルOc を越えずに、かつ、直流リンク電圧検出値
Vdcが直流リンク電圧制限レベルOv を越えない場合に
は、インバータ出力アームを還流状態へ切り換えると同
時に電圧位相の積算を停止できることになる。そのた
め、高速回転中の誘導電動機の緊急停止動作時でも、誘
導電動機内部の磁束を一定に保ったまま減速トルクを急
峻に増加させる事ができ、かつインバータが過電流にな
らない限界電流を安定に流し続けることができる。ま
た、インバータが過電流にもならないので、誘導電動機
の一次銅損及び二次銅損を最大にでき、これにより回転
エネルギーを有効に消費させることが可能となり、大き
な減速トルクを発生できる。
According to this embodiment, when the current detection value I does not exceed the current limit level Oc and the DC link voltage detection value Vdc does not exceed the DC link voltage limit level Ov, the inverter output arm is turned on. The voltage phase integration can be stopped at the same time as switching to the return state. Therefore, even during an emergency stop operation of the induction motor during high-speed rotation, the deceleration torque can be sharply increased while keeping the magnetic flux inside the induction motor constant, and the limiting current that does not cause overcurrent in the inverter can be made to flow stably. I can continue. Further, since the inverter does not become an overcurrent, the primary copper loss and the secondary copper loss of the induction motor can be maximized, whereby the rotational energy can be effectively consumed and a large deceleration torque can be generated.

【0023】本発明は、誘導電動機速度が高速の場合に
は非常に有効であるが、電動機の回転速度が低い場合に
はあまり効果的ではない。そのため、本実施例におい
て、誘導電動機がある程度減速し、所定の回転速度以下
になった場合に、直流を電動機に印加する方式に切替え
る構成を付加することで、さらに減速を早めることがで
きる。
The present invention is very effective when the induction motor speed is high, but is not so effective when the rotation speed of the electric motor is low. Therefore, in this embodiment, when the induction motor is decelerated to some extent and becomes lower than a predetermined rotation speed, a configuration for switching to a method of applying direct current to the motor can be added to further accelerate deceleration.

【0024】また、従来のインバータ出力周波数を徐々
に減少させる方式を併用することにより、かなり減速し
た時点で直流リンク電圧の超過による還流状態からの復
帰が行われた場合の電流立ち上がりが緩和され、制御周
期を長くとっても過電流トリップにならないようにする
ことができる。また、回生放電抵抗器を併用すること
で、さらに高速に低減でき、モータの過熱や、振動が抑
止できる。
Further, by additionally using the conventional method of gradually decreasing the inverter output frequency, the current rise when the recovery from the return state is performed due to the excess of the DC link voltage at the time of considerably decelerating is mitigated, Even if the control cycle is long, it is possible to prevent an overcurrent trip. Further, by using the regenerative discharge resistor together, it is possible to further reduce the speed and suppress overheating and vibration of the motor.

【0025】[0025]

【発明の効果】本発明によれば、誘導電動機を電圧形P
WMインバータで駆動するインバータ装置において、高
速回転中の誘導電動機を緊急停止させる必要が生じた場
合でも、誘導電動機内部の磁束を一定に保ったままで、
減速トルクを急峻に増加させる事ができ、かつインバー
タが過電流にならない限界電流を安定に流し続けること
で、誘導電動機の一次銅損及び二次銅損を最大にでき、
これにより回転エネルギーを有効に消費させることが可
能となり、大きな減速トルクを発生できるというような
優れた効果を奏するものである。
According to the present invention, the induction motor is provided with the voltage source P.
In an inverter device driven by a WM inverter, even when it is necessary to stop the induction motor during high-speed rotation in an emergency, the magnetic flux inside the induction motor is kept constant,
The deceleration torque can be sharply increased, and the inverter's primary current and secondary copper loss can be maximized by keeping the limiting current that the inverter does not overcurrent flow stably.
As a result, it is possible to effectively consume the rotational energy, and it is possible to produce a large deceleration torque, which is an excellent effect.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例の主回路構成を示すブロック回
路図である。
FIG. 1 is a block circuit diagram showing a main circuit configuration of an embodiment of the present invention.

【図2】本発明による実施例における高速回転中の誘導
電動機の緊急停止動作時の計算機シミュレーションを示
す図である。
FIG. 2 is a diagram showing a computer simulation during an emergency stop operation of an induction motor during high speed rotation in an example according to the present invention.

【図3】従来のインバ−タ装置における高速回転中の誘
導電動機の緊急停止動作時の計算機シミュレーションを
示す図である。
FIG. 3 is a diagram showing a computer simulation during an emergency stop operation of an induction motor during high-speed rotation in a conventional inverter device.

【符号の説明】[Explanation of symbols]

1…正側直流母線P、 2…負側直流母
線N、3…主回路コンデンサ、 4…U相
正側スイッチング素子、5…U相負側スイッチング素
子、 6…V相正側スイッチング素子、7…V相負
側スイッチング素子、 8…W相正側スイッチング
素子、9…W相負側スイッチング素子、 10…誘導
電動機、11…絶対値整流回路、 12…比
較器、13…直流リンク電圧検出器、 14…比較
器、15…AND回路、 16…制御回
路、I …電流検出値、 Oc …電流制
限レベル、S1 …電流低下信号、 Vdc…
直流電圧検出値 Oc …直流リンク電圧制限レベル、 S2 …電圧低下信
号 S3 …還流状態切換え信号、 Iu …電動機線電
流、Vdc…直流リンク電圧、 N…電動機速
度、T …電動機トルク。
1 ... Positive side DC bus P, 2 ... Negative side DC bus N, 3 ... Main circuit capacitor, 4 ... U phase positive side switching element, 5 ... U phase negative side switching element, 6 ... V phase positive side switching element, 7 ... V-phase negative side switching element, 8 ... W-phase positive side switching element, 9 ... W-phase negative side switching element, 10 ... Induction motor, 11 ... Absolute value rectifying circuit, 12 ... Comparator, 13 ... DC link voltage detector , 14 ... Comparator, 15 ... AND circuit, 16 ... Control circuit, I ... Current detection value, Oc ... Current limit level, S1 ... Current drop signal, Vdc ...
DC voltage detection value Oc ... DC link voltage limit level, S2 ... Voltage drop signal S3 ... Reflux state switching signal, Iu ... Motor line current, Vdc ... DC link voltage, N ... Motor speed, T ... Motor torque.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 誘導電動機を電圧形PWMインバータで
駆動するインバータ装置において、 誘導電動機の減速開始後、インバータ出力電流の検出値
が所定の電流制限値を越えていないことを判定する電流
値判定手段と、 前記検出値が所定の電流制限値を越えていないと電流値
判定手段が判定すると、インバータ出力PWM電圧の位
相の進行を停止する位相制御手段と、 前記検出値が所定の電流制限値を越えていないと電流値
判定手段が判定すると、インバータ出力アームを還流状
態へ切換えるアーム切換手段と、を有することを特徴と
するインバータ装置。
1. An inverter device for driving an induction motor with a voltage-type PWM inverter, wherein current value determination means for determining that the detected value of the inverter output current does not exceed a predetermined current limit value after deceleration of the induction motor is started. When the current value determination means determines that the detected value does not exceed the predetermined current limit value, the phase control means that stops the advance of the phase of the inverter output PWM voltage, and the detected value determines the predetermined current limit value. An inverter device comprising: arm switching means for switching the inverter output arm to a return state when the current value determination means determines that the current value has not exceeded.
【請求項2】 誘導電動機の減速開始後、誘導電動機の
回転速度が所定の回転速度以下になったことを判定する
速度判定手段と、 誘導電動機の回転速度が所定の回転速度以下になったと
速度判定手段が判定すると、誘導電動機に直流を印加す
る直流制動手段を有することを特徴とする請求項1記載
のインバータ装置。
2. A speed determining means for determining that the rotation speed of the induction motor has become less than or equal to a predetermined rotation speed after deceleration of the induction motor, and a speed when the rotation speed of the induction motor has become less than or equal to the predetermined rotation speed. The inverter device according to claim 1, further comprising direct current braking means for applying direct current to the induction motor when the determination means makes a determination.
JP4310047A 1992-11-19 1992-11-19 Inverter device Expired - Lifetime JP2980469B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4310047A JP2980469B2 (en) 1992-11-19 1992-11-19 Inverter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4310047A JP2980469B2 (en) 1992-11-19 1992-11-19 Inverter device

Publications (2)

Publication Number Publication Date
JPH06165582A true JPH06165582A (en) 1994-06-10
JP2980469B2 JP2980469B2 (en) 1999-11-22

Family

ID=18000529

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4310047A Expired - Lifetime JP2980469B2 (en) 1992-11-19 1992-11-19 Inverter device

Country Status (1)

Country Link
JP (1) JP2980469B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007330047A (en) * 2006-06-08 2007-12-20 Yokogawa Electric Corp Power-generating braking device
JP2008211953A (en) * 2007-02-28 2008-09-11 Tietech Co Ltd Servo controller for motor
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JP2014057391A (en) * 2012-09-11 2014-03-27 Juki Corp Motor control device, and method of controlling the same
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