JP2836884B2 - Inverter device - Google Patents
Inverter deviceInfo
- Publication number
- JP2836884B2 JP2836884B2 JP2012907A JP1290790A JP2836884B2 JP 2836884 B2 JP2836884 B2 JP 2836884B2 JP 2012907 A JP2012907 A JP 2012907A JP 1290790 A JP1290790 A JP 1290790A JP 2836884 B2 JP2836884 B2 JP 2836884B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- value
- motor
- detection signal
- current
- 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
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、電動機に供給される電力の周波数制御を行
うインバータ装置に関するもので、例えば空調機の冷媒
圧縮機の駆動電動機として好適に適用できるインバータ
装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device that controls the frequency of electric power supplied to an electric motor, and can be suitably applied to, for example, a drive motor of a refrigerant compressor of an air conditioner. It relates to an inverter device.
［従来の技術］ 従来の空調機の冷媒圧縮機の駆動電動機を運転する制
御装置の概略は第３図のような構成になっている。同図
において、３相交流電源１の交流電力は３相全波整流回
路のようなコンバータ２により直流に変換され、次にイ
ンバータ装置の電力スイッチング部３により任意の周波
数の３相交流電力に変換されて負荷である冷媒圧縮機駆
動用電動機４に供給される。インバータ装置は、電動機
４に供給する上記交流電力の周波数が高いほどその出力
電流を大きくする様に構成されており、これにより、電
動機４はインバータ装置から供給される交流の周波数に
対応した回転速度で駆動される。電動機４に流れる電流
は電流検出器５により検出され、その電流検出信号I1は
空調機装置の制御器に備えられたマイクロコンピュータ
６に入力される。マイクロコンピュータ６は、室内温度
センサなどの外部情報源７からの情報に基づき所要周波
数の計算を行って、この周波数指示をインバータ装置の
コントローラ８に与える。コントローラ８は、マイクロ
コンピュータ６からの上記指示に従ってその指示通りの
周波数の駆動信号を電力スイッチング部３に与えてスイ
ッチングさせ、これにより、該周波数にてインバータ装
置は電動機４を駆動する。[Prior Art] A control device for driving a drive motor of a refrigerant compressor of a conventional air conditioner is schematically configured as shown in FIG. In the figure, AC power of a three-phase AC power supply 1 is converted into DC by a converter 2 such as a three-phase full-wave rectifier circuit, and then converted into three-phase AC power of an arbitrary frequency by a power switching unit 3 of the inverter device. The load is supplied to the refrigerant compressor drive motor 4 which is a load. The inverter device is configured to increase the output current as the frequency of the AC power supplied to the motor 4 increases, whereby the motor 4 rotates at a rotational speed corresponding to the frequency of the AC supplied from the inverter device. Driven by Current flowing through the electric motor 4 is detected by the current detector 5, the current detection signal I 1 is input to the microcomputer 6 provided in the controller of the air conditioner apparatus. The microcomputer 6 calculates a required frequency based on information from an external information source 7 such as an indoor temperature sensor, and gives this frequency instruction to the controller 8 of the inverter device. In accordance with the instruction from the microcomputer 6, the controller 8 supplies the power switching unit 3 with a drive signal having a frequency as instructed by the instruction, and causes the power switching unit 3 to perform switching.
このように通常の場合、つまり電動機４に流れる電流
が所定電流（電動機定格電流）以下の場合には、外部情
報源７からの情報に応動するマイクロコンピュータ６に
よって電動機４の運転周波数が決められる。As described above, in a normal case, that is, when the current flowing through the motor 4 is equal to or less than a predetermined current (motor rated current), the microcomputer 6 that responds to information from the external information source 7 determines the operating frequency of the motor 4.
もし、電流検出器５からの電流検出信号I1が過負荷信
号（つまり、電動機４の定格電流を超過していること）
を示すときには、マイクロコンピュータ６は過負荷条件
下での周波数計算を行い、周波数低減の指示をインバー
タ装置のコントローラ８に与える。マイクロコンピュー
タ６からの周波数低減の指示により、コントローラ８は
周波数を低減した駆動信号を電力スイッチング部３に与
える。このようにして、過負荷電流が流れた場合には電
動機４に給電される電力の周波数を低下させて過電流の
抑制を行っている。If the current detection signal I 1 from the current detector 5 overload signal (that is, it exceeds the rated current of the motor 4)
Indicates the frequency under the overload condition, and gives a frequency reduction instruction to the controller 8 of the inverter device. In response to a frequency reduction instruction from the microcomputer 6, the controller 8 supplies a drive signal with a reduced frequency to the power switching unit 3. In this way, when the overload current flows, the frequency of the power supplied to the electric motor 4 is reduced to suppress the overcurrent.
［発明が解決しようとする課題］ しかしながらこのような従来装置にあっては、電動機
に流れる電流の電流検出信号を空調装置の制御器のマイ
クロコンピュータ６に入力し、このマイクロコンピュー
タ６で過負荷か或いは正常かを判定し、この判定結果を
加味して電動機の運転周波数を低減する計算を行わねば
ならないのでマイクロコンピュータ６での処理が複雑に
なる。かつ、インバータ装置のコントローラ８が直接過
電流信号を受けて周波数を低下させる制御を行っておら
ず、マイクロコンピュータ６からの周波数低減の指令に
よってコントローラ８が周波数低減の制御を行っている
ので、その周波数の低減速度と低減幅が適切にならず、
これらの原因で電動機の運転周波数がハンチングすると
いう問題を生じた。[Problems to be Solved by the Invention] However, in such a conventional device, a current detection signal of a current flowing through the electric motor is input to the microcomputer 6 of the controller of the air conditioner, and the microcomputer 6 determines whether the microcomputer 6 is overloaded. Alternatively, it is determined whether the motor is normal, and a calculation for reducing the operating frequency of the motor must be performed in consideration of the determination result, so that the processing in the microcomputer 6 becomes complicated. In addition, since the controller 8 of the inverter device does not directly perform the control of lowering the frequency by receiving the overcurrent signal, the controller 8 performs the frequency reduction control in response to the frequency reduction command from the microcomputer 6. The frequency reduction speed and reduction width are not appropriate,
For these reasons, there has been a problem that the operating frequency of the motor hunts.
［課題を解決するための手段］ 本発明は、前記した従来の問題点を解決するためにな
されたもので、本発明によるインバータ装置は、電動機
を流れる電流を検出する電流検出器と、電力スイチング
部と、そのコントローラと、を有し、周波数制御によっ
て電動機を駆動するインバータ装置において、前記電流
検出器よりの検出信号の値と前記電動機の定格電流に対
応した定格値とを所定の期間毎に比較する比較手段と、
該比較手段による前記所定の期間毎の比較の際に前記電
流検出器よりの検出信号の値が前記定格値よりも大きい
と判断された場合、前記比較の都度前記検出信号の値に
対応した周波数から小幅の一定周波数を減算する減算手
段とを備え、前記比較の都度における前記検出信号の値
が前記定格値より小さくなるまで前記検出信号の値に対
応した周波数から多数回にわたって前記小幅の一定周波
数を順次減算していくことを特徴とするものである。Means for Solving the Problems The present invention has been made to solve the above-mentioned conventional problems, and an inverter device according to the present invention has a current detector for detecting a current flowing through an electric motor, and a power switching device. Unit, and a controller thereof, in an inverter device that drives the motor by frequency control, wherein a value of a detection signal from the current detector and a rated value corresponding to a rated current of the motor are changed every predetermined period. Means for comparing,
When it is determined that the value of the detection signal from the current detector is larger than the rated value at the time of the comparison for each of the predetermined periods, the frequency corresponding to the value of the detection signal is used for each comparison. And a subtraction means for subtracting a small constant frequency from the constant frequency of the small number of times from the frequency corresponding to the value of the detection signal until the value of the detection signal in each comparison becomes smaller than the rated value. Are sequentially subtracted.
［作用］ インバータ側で電動機過負荷の状態を判断し、電動機
に給電される電力の周波数を低下させる制御を行ってい
るので、過負荷時に周波数を高速で所望量だけ低減する
ことができ、他方、電動機利用装置（空調装置など）の
制御側では本来目標とすべき周波数の指示を行うだけで
あるので、制御が簡単であり、したがって、できるだけ
定格負荷以下の周波数で安定に長時間運転できる。[Operation] Since the inverter side determines the state of motor overload and performs control to reduce the frequency of the power supplied to the motor, the frequency can be reduced at a high speed by a desired amount at the time of overload. On the control side of the motor-using device (such as an air conditioner), only the frequency which should be originally targeted is instructed, so that the control is simple, and therefore the operation can be performed stably for a long time at a frequency below the rated load as much as possible.
［実施例］ 以下本発明の一実施例を第１図及び第２図により説明
する。Embodiment One embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
第１図に示すように、装置（電動機で圧縮機を駆動す
る空調装置など）の制御器では検出した室内温度のよう
な外部情報に相当する信号と設定信号とから所要周波数
の計算を行い、この周波数指示をインバータ側に与え
る。インバータ側では、この指示に応じた周波数で電動
機４を駆動し、また、電動機電流を常時監視して過負荷
か否かの判定をし、過負荷状態が検出されたときには、
その都度制御器から指示された上記周波数から予め決め
られた小幅の一定周波数を減算し、この小幅の一定周波
数の減算された周波数の交流電力を電動機に供給する。
そしてこの周波数低減の制御は電動機に流れる電流が定
格値より小さくなるまで、つまり、過負荷でなくなるま
で、続けられる。As shown in FIG. 1, a controller of a device (such as an air conditioner that drives a compressor by an electric motor) calculates a required frequency from a signal corresponding to external information such as a detected room temperature and a setting signal, This frequency instruction is given to the inverter. On the inverter side, the motor 4 is driven at a frequency corresponding to this instruction, and the motor current is constantly monitored to determine whether or not an overload has occurred.
Each time, a predetermined small constant frequency is subtracted from the above-mentioned frequency specified by the controller, and the AC power of the frequency obtained by subtracting the small constant frequency is supplied to the electric motor.
This frequency reduction control is continued until the current flowing through the motor becomes smaller than the rated value, that is, until the load is no longer overloaded.
第２図はその制御回路であり、同図において、第３図
に示した記号と同一の記号は相当する部分を示してい
る。同図からも分るように電動機４を流れる電流を検出
する電流検出器５からの電流検出信号I1はインバータ装
置内のコントローラ８に入力される。コントローラ８は
常に上記電流検出信号のサンプリング値I1と電動機４の
定格電流に対応する定格値I0とを比較しており、I1＞I0
の状態が現出したとき過電流状態が発生したものと判定
して、装置の制御器６から指示された周波数Fcから小幅
の一定周波数F1だけ減少させた周波数（Fc−F1）の駆動
信号を電力スイッチング部３に供給する。そして次のサ
ンプリング期間でも電流検出信号のサンプリング値I1が
定格値I0より大きければ、更に、装置の制御器６から指
示された周波数Fcから小幅の一定周波数F1×２を減算し
た周波数（Fc−２F1）で電力スイッチング部３を駆動す
る。このような周波数低減の制御は、過電流状態が消滅
するまで、つまりI1≦I0の状態になるまで各サンプリン
グ期間毎に行われる。ここで減算される小幅の一定周波
数F1は適宜定めるが、比較的小さく設定しておけば、負
荷４の駆動周波数が大幅に急減することがなく、したが
って周波数のハンチングによる装置の不安定な動作を防
ぐことが出来る。電力スイッチング部３はトランジスタ
のようなスイッチング半導体素子で構成した３相ブリッ
ジ回路とトランスなどからなる通常のものであり、前記
駆動信号によりスイッチング動作を行う。したがって、
駆動信号の周波数が低減されると、電力スイッチング部
３のオンデューティ比は減少し、電動機４に流れる電流
も当然減少する。FIG. 2 shows the control circuit, in which the same symbols as those shown in FIG. 3 indicate corresponding parts. Current detection signal I 1 from the current detector 5 for detecting a current flowing through the motor 4 as can be seen from the figure is input to the controller 8 in the inverter device. The controller 8 is always compared with the rated value I 0 corresponding to the sampling value I 1 and the rated current of the motor 4 of the current detection signal, I 1> I 0
When the state was emerge it is determined as an overcurrent condition occurs, the drive of constant frequencies F 1 only reduced frequency slightly from the frequency Fc instructed by the controller 6 of the apparatus (Fc-F 1) The signal is supplied to the power switching unit 3. And if the sampling value I 1 of the next current detection signal in a sampling period is greater than the rated value I 0, further, by subtracting the constant frequency F 1 × 2 small width from the frequency Fc instructed by the controller 6 of the apparatus Frequency ( The power switching unit 3 is driven by Fc−2F 1 ). Such frequency reduction control is performed for each sampling period until the overcurrent state disappears, that is, until the state of I 1 ≦ I 0 is satisfied. Certain frequencies F 1 of small width to be subtracted herein suitably determined but, by setting relatively small, without driving frequency of the load 4 rapidly decreases significantly, thus unstable operation of the device according to the hunting frequency Can be prevented. The power switching unit 3 is a normal one including a three-phase bridge circuit including a switching semiconductor element such as a transistor and a transformer, and performs a switching operation by the drive signal. Therefore,
When the frequency of the drive signal is reduced, the on-duty ratio of the power switching unit 3 is reduced, and the current flowing through the motor 4 is naturally reduced.
［発明の効果］ 以上述べたように、本発明では電動機に給電するイン
バータ装置内で過電流状態の発生を判定し、その発生が
判定されたとき過電流状態が消滅するまで各サンプリン
グ期間毎に電動機利用装置の制御器から指示された周波
数から小幅の一定周波数を多数回にわたって順次減算
し、これをインバータ装置の動作周波数とするので、電
動機利用装置の制御器での処理を簡単化することができ
ると共に、過負荷時における周波数低減の制御を適切か
つ高速で行うことができ、したがって周波数のハンチン
グによって電動機の動作が不安定になることもなく、安
定に長時間運転できる。[Effects of the Invention] As described above, according to the present invention, the occurrence of an overcurrent state is determined in the inverter device that supplies power to the motor, and when the occurrence is determined, the overcurrent state disappears every sampling period until the overcurrent state disappears. Since the constant frequency having a small width is sequentially subtracted a number of times from the frequency specified by the controller of the motor-using device, and this is used as the operating frequency of the inverter device, processing at the controller of the motor-using device can be simplified. In addition, frequency reduction control during overload can be performed appropriately and at high speed, so that operation of the motor can be stably operated for a long time without unstable operation due to frequency hunting.
第１図及び第２図は本発明に係るインバータ装置の一実
施例を説明するための図、第３図は従来例を説明するた
めの図である。 １……電源、２……コンバータ ３……電力スイッチング部 ４……電動機、５……電流検出器 ６……マイクロコンピュータ ７……外部情報源、８……コントローラ1 and 2 are diagrams for explaining an embodiment of the inverter device according to the present invention, and FIG. 3 is a diagram for explaining a conventional example. DESCRIPTION OF SYMBOLS 1 ... Power supply 2 ... Converter 3 ... Power switching part 4 ... Electric motor 5 ... Current detector 6 ... Microcomputer 7 ... External information source 8 ... Controller
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H02P 5/408 - 5/412 H02P 7/628 - 7/632 H02P 21/00Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) H02P 5/408-5/412 H02P 7/628-7/632 H02P 21/00
Claims (1)
と、電力スイチング部と、そのコントローラと、を有
し、周波数制御によって電動機を駆動するインバータ装
置において、 前記電流検出器よりの検出信号の値と前記電動機の定格
電流に対応した定格値とを所定の期間毎に比較する比較
手段と、該比較手段による前記所定の期間毎の比較の際
に前記電流検出器よりの検出信号の値が前記定格値より
も大きいと判断された場合、前記比較の都度前記検出信
号の値に対応した周波数から小幅の一定周波数を減算す
る減算手段とを備え、前記比較の都度における前記検出
信号の値が前記定格値より小さくなるまで前記検出信号
の値に対応した周波数から多数回にわたって前記小幅の
一定周波数を順次減算していくことを特徴とするインバ
ータ装置。An inverter device having a current detector for detecting a current flowing through a motor, a power switching unit, and a controller for driving the motor by frequency control. Comparing means for comparing a value and a rated value corresponding to the rated current of the motor at predetermined intervals, and a value of a detection signal from the current detector at the time of comparison at each predetermined time period by the comparing means. When it is determined that the value is greater than the rated value, a subtraction unit that subtracts a small constant frequency from the frequency corresponding to the value of the detection signal each time the comparison is performed, and the value of the detection signal at each comparison is An inverter device for sequentially subtracting the narrow constant frequency many times from a frequency corresponding to the value of the detection signal until the frequency becomes smaller than the rated value. Place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012907A JP2836884B2 (en) | 1990-01-23 | 1990-01-23 | Inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012907A JP2836884B2 (en) | 1990-01-23 | 1990-01-23 | Inverter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03218296A JPH03218296A (en) | 1991-09-25 |
| JP2836884B2 true JP2836884B2 (en) | 1998-12-14 |
Family
ID=11818432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2012907A Expired - Lifetime JP2836884B2 (en) | 1990-01-23 | 1990-01-23 | Inverter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2836884B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2806226B1 (en) * | 2000-03-07 | 2002-05-31 | Valeo Climatisation | CONTROL DEVICE OF AN ELECTRIC COMPRESSOR FOR AIR CONDITIONING CIRCUIT |
| KR101395890B1 (en) | 2007-10-18 | 2014-05-15 | 엘지전자 주식회사 | Motor controller of air conditioner and method of the motor controller |
| JP5344946B2 (en) * | 2009-02-09 | 2013-11-20 | カルソニックカンセイ株式会社 | Electric compressor control device |
| EP3681028A4 (en) * | 2017-09-06 | 2021-04-07 | Hitachi Industrial Equipment Systems Co., Ltd. | Power conversion device |
-
1990
- 1990-01-23 JP JP2012907A patent/JP2836884B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03218296A (en) | 1991-09-25 |
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