JP2713826B2 - Inverter device - Google Patents
Inverter deviceInfo
- Publication number
- JP2713826B2 JP2713826B2 JP3307551A JP30755191A JP2713826B2 JP 2713826 B2 JP2713826 B2 JP 2713826B2 JP 3307551 A JP3307551 A JP 3307551A JP 30755191 A JP30755191 A JP 30755191A JP 2713826 B2 JP2713826 B2 JP 2713826B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- induction motor
- stall prevention
- overvoltage
- 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.)
- Expired - Lifetime
Links
Landscapes
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】この発明は、過電流、回生過電圧
時に負荷電流、回生エネルギーを減少させるべく周波数
を制御するインバータ装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device for controlling a frequency to reduce a load current and a regenerative energy when an overcurrent or a regenerative overvoltage occurs.
【０００２】[0002]
【従来の技術】図３は、従来の失速防止回路付汎用イン
バータの構成を示す説明図であり、図において、１は三
相商用電源、２は汎用インバータ主回路部、３は誘導電
動機、４は電圧検出回路、５はインバータ部の駆動回
路、６は電流検出回路、７は過電流、過電圧時に負荷電
流、回生エネルギーを減少させるべく周波数を制御する
失速防止回路、８はＣＰＵ等の演算回路で構成された制
御回路である。2. Description of the Related Art FIG. 3 is an explanatory view showing the configuration of a conventional general-purpose inverter with a stall prevention circuit. In FIG. 3, reference numeral 1 denotes a three-phase commercial power supply, 2 denotes a general-purpose inverter main circuit unit, 3 denotes an induction motor, Is a voltage detection circuit, 5 is a drive circuit of an inverter unit, 6 is a current detection circuit, 7 is a stall prevention circuit that controls frequency to reduce overcurrent and load current and regenerative energy when overvoltage occurs, and 8 is an arithmetic circuit such as a CPU. Is a control circuit composed of
【０００３】次に、動作について説明する。インバータ
装置にて誘導電動機３を加減速運転するモードにて、加
減速時間が短い場合や、負荷が重い場合、電流検出回路
６、電圧検出回路４により、過電流、過電圧になり、過
電流遮断、過電圧遮断状態に至るのを防止するため、遮
断レベルより低いレベルにおいて失速防止レベルを設
け、そのレベルに到達したとき、それ以上電流、電圧が
増加しないよう失速防止回路７にて周波数を制御する。
この回路は加速時、定速時、減速時にかかわらず動作す
る。加速中に失速防止レベルを越え過電流状態になった
場合は、周波数の上昇を止め、定速中は周波数を下げ負
荷電流を減少させる。また、減速中に失速防止レベルを
越え過電流、過電圧になった場合は、周波数の下降を止
め負荷電流、回生エネルギーを減少させるものである。Next, the operation will be described. In the mode in which the induction motor 3 is accelerated / decelerated by the inverter device, if the acceleration / deceleration time is short or the load is heavy, the current detection circuit 6 and the voltage detection circuit 4 cause overcurrent and overvoltage, and the overcurrent is interrupted. In order to prevent an overvoltage cutoff state, a stall prevention level is provided at a level lower than the cutoff level, and when the level is reached, the frequency is controlled by the stall prevention circuit 7 so that the current and voltage do not increase any more. .
This circuit operates regardless of acceleration, constant speed, and deceleration. If the current exceeds the stall prevention level during acceleration and an overcurrent state occurs, the increase in frequency is stopped, and the frequency is reduced during constant speed to reduce the load current. If the current exceeds the stall prevention level during deceleration and becomes overcurrent or overvoltage, the frequency is stopped from decreasing and the load current and regenerative energy are reduced.
【０００４】その他、この発明に関連する参考技術文献
として特開昭６２−１１６４９６号公報に開示されてい
る「巻上機の失速防止装置」がある。[0004] As another technical reference related to the present invention, there is a "stall prevention device for a hoist" disclosed in Japanese Patent Application Laid-Open No. 62-116496.
【０００５】[0005]
【発明が解決しようとする課題】従来のインバータ装置
は、以上のように構成されているので、例えば、昇降
機、搬送機等定位置にて停止させないと危険な状況が発
生する用途に使用した場合において、減速時に失速防止
回路が作動したとき周波数の下降が止まるため、停止位
置が周波数の下降を止めた時間分延びてしまうことに起
因して事故発生につながる危険な状態を招来する等の問
題点があった。Since the conventional inverter device is configured as described above, it is used, for example, in an application where a dangerous situation occurs unless it is stopped at a fixed position such as an elevator, a transporter, and the like. In the above, the frequency drop stops when the stall prevention circuit is activated during deceleration, so that the stop position is extended by the time during which the frequency drop was stopped, resulting in a dangerous situation that could lead to an accident. There was a point.
【０００６】この発明は、上記のような問題点を解決す
るためになされたもので、周波数下降停止に起因する停
止位置オーバーランを防止し、事故発生につながる危険
な状態を確実に回避することができるインバータ装置を
得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is intended to prevent a stop position overrun caused by a frequency lowering stop and to reliably avoid a dangerous state which may cause an accident. It is an object of the present invention to obtain an inverter device capable of performing the following.
【０００７】この発明に係るインバータ装置は、誘導電
動機の回転速度を周波数により制御するインバータ装置
において、負荷電流を検出する負荷電流検出手段と、過
電圧を検出する過電圧検出手段と、前記負荷電流検出手
段及び（或いは）過電圧検出手段により検出された過電
流、回生過電圧時に負荷電流、回生エネルギーを減少さ
せるべく周波数を制御する失速防止手段と、前記誘導電
動機の運転状態を判別する判別手段と、前記判別手段に
より判別された前記誘導電動機の運転状態に応じて前記
失速防止手段を制御する制御手段とを備え、前記制御手
段は、前記判別手段が前記誘導電動機の減速状態を判別
したとき、前記失速防止手段を停止させるものである。[0007] An inverter device according to the present invention is an inverter device for controlling the rotation speed of an induction motor by frequency, wherein the load current detection means detects a load current, the overvoltage detection means detects an overvoltage, and the load current detection means. And / or stall prevention means for controlling frequency to reduce load current and regenerative energy at the time of overcurrent and regenerative overvoltage detected by overvoltage detection means, and determination means for determining an operation state of the induction motor; and control means for controlling the stall preventing means in accordance with the operating state of the induction motor is determined by the means, the control hand
In the step, the determining means determines a deceleration state of the induction motor.
Then, the stall prevention means is stopped .
【０００８】また、前記制御手段は、前記判別手段が前
記誘導電動機の減速状態を判別したとき、前記失速防止
手段を停止させるものである。Further, the control means stops the stall prevention means when the determination means determines the deceleration state of the induction motor.
【０００９】[0009]
【作用】誘導電動機の運転状態により、加速、定速、減
速の各状態を判別し、各々任意の運転状態に応じて失速
防止回路の動作を適宜制御することにより、失速防止回
路が特定の状況にて作動したときに発生する危険な状態
を確実に回避する。According to the operation state of the induction motor, each state of acceleration, constant speed, and deceleration is determined, and the operation of the stall prevention circuit is appropriately controlled in accordance with each of the arbitrary operation states. Dangerous situations that occur when operating at are reliably avoided.
【００１０】[0010]
【実施例】以下、この発明の一実施例を図について説明
する。図中、図３と同一の部分は同一の符号をもって図
示し、その説明は省略する。図１において、９は誘導電
動機３の運転状態、即ち、加速、定速、減速の各状態を
判別して、各情報信号を制御回路８に出力する運転状態
判別回路であり、図２は、運転状態を判別する動作を示
したフローチャートである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, reference numeral 9 denotes an operation state discriminating circuit for discriminating the operation state of the induction motor 3, that is, each state of acceleration, constant speed, and deceleration, and outputting each information signal to the control circuit 8. FIG. 5 is a flowchart illustrating an operation of determining an operation state.
【００１１】次に、動作について説明する。失速防止回
路７の動作は従来例と同一であるが、この発明では運転
状態を判別する運転状態判別回路９からの情報信号に基
づいて失速防止回路７が制御される。その動作について
説明する。図２において、誘導電動機３の運転状態判別
処理（Ｓ１００）により、まず、運転指令出力の有無を
判断し（Ｓ１０１）、運転指令出力有と判断したときに
は、次に、指令周波数と実際の運転周波数とを比較する
（Ｓ１０２）。その結果、指令周波数が実際の運転周波
数より大きい場合（指令周波数＞運転周波数）は、加速
中（Ａ）と判断し、指令周波数と運転周波数とが等しい
場合（指令周波数＝運転周波数）は定速中（Ｂ）と判断
し、指令周波数が小さい場合（指令周波数＜運転周波
数）は減速中（Ｃ）と判断する。Next, the operation will be described. The operation of the stall prevention circuit 7 is the same as that of the conventional example, but in the present invention, the stall prevention circuit 7 is controlled based on the information signal from the operation state determination circuit 9 for determining the operation state. The operation will be described. In FIG. 2, the operation state determination process (S100) of the induction motor 3 first determines whether or not there is an operation command output (S101). When it is determined that the operation command output is present, the command frequency and the actual operation frequency are next determined. Are compared (S102). As a result, when the command frequency is higher than the actual operating frequency (command frequency> operating frequency), it is determined that the vehicle is accelerating (A), and when the command frequency is equal to the operating frequency (command frequency = operating frequency), the speed is constant. If the command frequency is low (command frequency <operating frequency), it is determined that the vehicle is decelerating (C).
【００１２】また、上記ステップＳ１０１で運転指令出
力無と判断したときには、運転周波数出力の有無が判断
され（Ｓ１０３）、運転周波数出力有のときは減速中
（Ｄ）と判断し、運転周波数出力無のときは停止中
（Ｅ）と判断する。以上、運転状態判別回路９により常
に誘導電動機３の運転状態を判別し、その判別された運
転状態に応じた情報信号を制御回路８に出力し、該制御
回路８は所定の演算処理後、失速防止回路７へ制御信号
を出力して失速防止回路７を制御できる構成になってい
る。具体的には、ステップＳ１０２で減速中（Ｃ）と判
断されたときには失速防止回路７を動作させないように
制御する。If it is determined in step S101 that there is no operation command output, it is determined whether or not there is an operation frequency output (S103). If there is an operation frequency output, it is determined that the vehicle is decelerating (D). In this case, it is determined that the vehicle is stopped (E). As described above, the operating state of the induction motor 3 is always determined by the operating state determining circuit 9, and an information signal corresponding to the determined operating state is output to the control circuit 8. The control circuit 8 performs a predetermined calculation process and then stalls. The configuration is such that a control signal is output to the prevention circuit 7 to control the stall prevention circuit 7. Specifically, when it is determined in step S102 that the vehicle is decelerating (C), control is performed so that the stall prevention circuit 7 is not operated.
【００１３】反対に、失速防止回路７を動作させないこ
とによるトラブルとしての過電流や過電圧の心配は減速
中においては一般的に少ない。なぜなら、この装置の使
用目的が、主に、通常は失速防止が働かないレベルで使
用していて、何らかの要因で失速防止回路が動作してし
まう場合の危険防止であり、その場合には装置の根本的
故障に起因するものであるから別途設けたトリップ回路
（図示せず）にて装置そのものを停止させればよい。Conversely, the fear of overcurrent or overvoltage as a trouble caused by not operating the stall prevention circuit 7 is reduced.
In general it is low. The purpose of this device is mainly to prevent danger in the event that the stall prevention circuit is activated for some reason when the device is normally used at a level where stall prevention does not work. Since the failure is caused by a fundamental failure, the apparatus itself may be stopped by a separately provided trip circuit (not shown).
【００１４】[0014]
【発明の効果】以上のように、この発明によれば、誘導
電動機の運転状態を判別する運転状態判別回路を備え、
判別された運動状態に応じて失速防止回路を制御するた
め、例えば、昇降機、搬送機等定位置にて停止させない
と危険な状況が発生する用途に使用した場合において、
減速時のみ失速防止回路の動作を止めることにより、失
速防止回路の動作に起因した周波数下降停止による停止
位置オーバーランを防止し、事故発生につながる危険な
状態を確実に回避することができる。As described above, according to the present invention, there is provided an operating state determining circuit for determining the operating state of an induction motor,
In order to control the stall prevention circuit according to the determined motion state, for example, when used in applications where dangerous situations occur unless stopped at fixed positions such as elevators and transporters,
By stopping the operation of the stall prevention circuit only at the time of deceleration, it is possible to prevent a stop position overrun due to a frequency lowering stop caused by the operation of the stall prevention circuit, and to reliably avoid a dangerous state that may cause an accident.
【図１】この発明によるインバータ装置の構成を示す説
明図である。FIG. 1 is an explanatory diagram showing a configuration of an inverter device according to the present invention.
【図２】図１に示した運動状態判別回路による運転状態
を判別する場合の処理動作を示すフローチャートであ
る。FIG. 2 is a flowchart showing a processing operation in a case where a driving state is determined by the exercise state determination circuit shown in FIG. 1;
【図３】従来におけるインバータ装置の構成を示す説明
図である。FIG. 3 is an explanatory diagram showing a configuration of a conventional inverter device.
１ 三相商用電源 ２ 汎用インバータ主回路部 ３ 誘導電動機 ４ 電圧検出回路 ５ 駆動回路 ６ 電流検出回路 ７ 失速防止回路 ８ 制御回路 ９ 運転状態判別回路 DESCRIPTION OF SYMBOLS 1 Three-phase commercial power supply 2 General-purpose inverter main circuit part 3 Induction motor 4 Voltage detection circuit 5 Drive circuit 6 Current detection circuit 7 Stall prevention circuit 8 Control circuit 9 Operating state discrimination circuit
Claims (1)
御するインバータ装置において、負荷電流を検出する負
荷電流検出手段と、過電圧を検出する過電圧検出手段
と、前記負荷電流検出手段及び（或いは）過電圧検出手
段により検出された過電流、回生過電圧時に負荷電流、
回生エネルギーを減少させるべく周波数を制御する失速
防止手段と、前記誘導電動機の運転状態を判別する判別
手段と、前記判別手段により判別された前記誘導電動機
の運転状態に応じて前記失速防止手段を制御する制御手
段とを備え、 前記制御手段は、前記判別手段が前記誘導電動機の減速
状態を判別したとき、前記失速防止手段を停止させるこ
と を特徴とするインバータ装置。1. An inverter device for controlling a rotation speed of an induction motor based on a frequency, wherein a load current detection means for detecting a load current, an overvoltage detection means for detecting an overvoltage, the load current detection means and / or an overvoltage detection. Overcurrent detected by the means, load current during regenerative overvoltage,
Stall prevention means for controlling a frequency to reduce regenerative energy, determination means for determining an operation state of the induction motor, and control of the stall prevention means in accordance with the operation state of the induction motor determined by the determination means and control means for said control means, decelerating said discrimination means of said induction motor
When the state is determined, it is necessary to stop the stall prevention means.
And an inverter device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3307551A JP2713826B2 (en) | 1991-11-22 | 1991-11-22 | Inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3307551A JP2713826B2 (en) | 1991-11-22 | 1991-11-22 | Inverter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05146186A JPH05146186A (en) | 1993-06-11 |
| JP2713826B2 true JP2713826B2 (en) | 1998-02-16 |
Family
ID=17970456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3307551A Expired - Lifetime JP2713826B2 (en) | 1991-11-22 | 1991-11-22 | Inverter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2713826B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6713979B2 (en) * | 2001-07-26 | 2004-03-30 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Actuator drive circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60249897A (en) * | 1984-05-25 | 1985-12-10 | Matsushita Electric Works Ltd | Rotating speed controller of induction motor |
| JPH0270280A (en) * | 1988-09-05 | 1990-03-09 | Kawasaki Steel Corp | Control method for electric motor |
-
1991
- 1991-11-22 JP JP3307551A patent/JP2713826B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05146186A (en) | 1993-06-11 |
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