JPS6059840B2 - Electric motor drive device - Google Patents
Electric motor drive deviceInfo
- Publication number
- JPS6059840B2 JPS6059840B2 JP54131438A JP13143879A JPS6059840B2 JP S6059840 B2 JPS6059840 B2 JP S6059840B2 JP 54131438 A JP54131438 A JP 54131438A JP 13143879 A JP13143879 A JP 13143879A JP S6059840 B2 JPS6059840 B2 JP S6059840B2
- Authority
- JP
- Japan
- Prior art keywords
- detection device
- frequency
- current
- voltage
- motor
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Description
【発明の詳細な説明】
この発明は、電動機の駆動装置、特に誘導電動機の自
動インバータによる１次周波数制御方式における起動失
敗保護装置に関するものてある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting failure protection device for an electric motor drive device, and particularly for an induction motor using a primary frequency control method using an automatic inverter.
誘導電動機の１次周波数制御による速度制御は、優れ
た速度制御方式として、多く使用されている。第１図は
、その回路構成を示すもので、１は誘導電動機、２は周
波数変換装置で、この周波数変換装置２は主回路３と制
御回路４とから構成される。５は１次開閉器てある。Speed control using primary frequency control of an induction motor is widely used as an excellent speed control method. FIG. 1 shows the circuit configuration thereof, where 1 is an induction motor, 2 is a frequency converter, and this frequency converter 2 is composed of a main circuit 3 and a control circuit 4. 5 is the primary switch.
周波数変換装置２としては、通常自動インバータが使用
され、自動インバータには、いわゆる電流形と電圧形が
あるが、これらについては、広く知られているので説明
は省略する。 第１図の回路構成においては、誘導電動
機１は、その１次電圧と１次周波数とを、周波数変換装
置２によつて制御され、与えられた周波数に対応する同
期速度に対し若干のすベリをもつて回転する。An automatic inverter is normally used as the frequency converter 2, and there are two types of automatic inverters: current type and voltage type, but since these are widely known, their explanation will be omitted. In the circuit configuration shown in FIG. 1, the induction motor 1 has its primary voltage and primary frequency controlled by the frequency converter 2, and has a slight deviation from the synchronous speed corresponding to the given frequency. Rotate with .
この場合、周波数変換装置２より与えられる電圧と周波
数との関係については、誘導電動機１の磁束密度が一定
になるように、電圧対周波数の比が、各周波数において
一定になるように制御されるのが普通である。また、第
１図に示す回路構成の周波数制御方式においては、指速
発電機等による回転系からの速度フィードバック信号を
、周波数変換装置２の制御回路４に還元しないのが、一
般的方法である。 運転中に、前述の電圧対周波数の比
が、所定の値より過大になると、誘導電動機は過励磁と
なり、所定の電流に対応した所定のトルクを発生しない
状態（以下、この状態を過励磁状態と呼ぶ。In this case, the relationship between the voltage applied by the frequency converter 2 and the frequency is controlled so that the ratio of voltage to frequency is constant at each frequency so that the magnetic flux density of the induction motor 1 is constant. is normal. In addition, in the frequency control method with the circuit configuration shown in FIG. 1, the general method is not to return the speed feedback signal from the rotating system such as a finger speed generator to the control circuit 4 of the frequency converter 2. . During operation, if the voltage-to-frequency ratio mentioned above becomes larger than a predetermined value, the induction motor becomes overexcited and does not generate a predetermined torque corresponding to a predetermined current (hereinafter, this state is referred to as an overexcitation state). It is called.
）となり、また逆に、電圧対周波数の比が、所定の値よ
り過小になると、誘導電動機は不足励磁となり、所定の
電流により所定のトルクを発生しない状態（以下、この
状態を不足励磁状態と呼ぶ。）となる。 第２図は、電
流形インバータを使用した回路構成を示すもので、第１
図をやや詳しくしたものである。), and conversely, when the ratio of voltage to frequency becomes smaller than a predetermined value, the induction motor becomes under-excited, and the predetermined torque is not generated by the predetermined current (hereinafter, this state is referred to as an under-excitation state). ). Figure 2 shows the circuit configuration using a current source inverter.
This is a slightly more detailed version of the diagram.
第２図において、１〜５は第１図に対応する機器、６は
コンバータ（整流装置）、７はインバータ（逆変換装置
）、８は平滑リアクトル、９は入力電流検出装置、１０
は速度設定器（周波数設定器）、１１はコンバータ６及
びインバータ７を構成するサイリスタの点弧角を制御す
る制御回路である。制御回路１１は、電圧制御回路（図
示せず）、周波数制御回路（図示せず）、電流制御回路
（図示せす）を備えており、電圧制御回路（図示せず）
からの制御信号により、コンバータ６が制御され、これ
により誘導電動機１に与える出力電圧が制御される。周
波数制御回路（図示せず）からの制御信号により、イン
バータ７が制御され、電動機１に与える出力周波数が制
御される。電流制御回路（図示せす）は、入力電流検出
装置９からの信号をもとに、回路保護上、主回路電流が
予め定められた電流値１Ｒに達すると、電流制御回路（
図示せず）内の電流りミッタ（図示せず）により、電圧
制御回路（図示せず）に優先して、コンバータ６を制御
して、電流を上記値１Ｒ以下におさえる機能を有する。
速度設定器（周波数設定器）１０は、自動又は手動て使
用されるもので、起動時には、誘導電動機１の加速時間
に合わせて、自動的に傾斜信号発生器（図示せず）等に
より、速度（周波数）信号を上けて行くのが普通である
。この信号が制御回路１１に内蔵されてい周波数制御回
路（図示せず）の基準信号となり、またこの信号に比例
した値が制御回路１１内に含まれている電圧制御回路（
図示せず）の基準となる。ここで、第２図をもとに説明
した従来の制御回路方式において、起動時にたとえば電
動機負荷である機械側の異常により、起動負荷トルクが
、所定の電動機起動トルクより過大になつた場合を考え
る。In Fig. 2, 1 to 5 are devices corresponding to Fig. 1, 6 is a converter (rectifier), 7 is an inverter (inverter), 8 is a smoothing reactor, 9 is an input current detection device, 10
1 is a speed setting device (frequency setting device), and 11 is a control circuit for controlling the firing angle of the thyristor constituting the converter 6 and the inverter 7. The control circuit 11 includes a voltage control circuit (not shown), a frequency control circuit (not shown), a current control circuit (not shown), and a voltage control circuit (not shown).
The converter 6 is controlled by the control signal from the converter 6, and thereby the output voltage given to the induction motor 1 is controlled. The inverter 7 is controlled by a control signal from a frequency control circuit (not shown), and the output frequency given to the electric motor 1 is controlled. Based on the signal from the input current detection device 9, the current control circuit (not shown) operates when the main circuit current reaches a predetermined current value of 1R for circuit protection.
A current limiter (not shown) in the converter 6 has a function of controlling the converter 6 with priority over the voltage control circuit (not shown) to suppress the current to the value 1R or less.
The speed setter (frequency setter) 10 is used automatically or manually, and at startup, the speed is automatically set by a slope signal generator (not shown) or the like in accordance with the acceleration time of the induction motor 1. It is normal to increase the (frequency) signal. This signal becomes a reference signal for a frequency control circuit (not shown) included in the control circuit 11, and a value proportional to this signal is set as a reference signal for a voltage control circuit (not shown) included in the control circuit 11.
(not shown). Now, consider a case where, in the conventional control circuit system explained based on Fig. 2, the starting load torque becomes excessive than the predetermined motor starting torque due to an abnormality on the machine side, which is the motor load, at the time of starting. .
周波数変換装置２は、速度設定器１０に内蔵されている
傾斜信号発生器（図示せず）により、予め決定された電
動機１の加速時間に合せて、徐々に周波数基準を上げて
行く。これに合わせて、出力電圧と出力周波数とか比例
的に上昇しようとする。この場合、負荷トルクが過大で
ある，から、電動機トルクを増やすために電流が増加し
、ついには制御回路１１に含まれている電流制限回路（
図示せず）のりミッタ値に到達する。この状態において
も、なお負荷トルクが過大であるため電動機１は回転を
始めない。ところで、周波ｊ数変換装置２の出力周波数
は電動機１が回転していなくても、周波数基準にしたが
つて上昇する。一方、周波数変換装置２の出力電圧は、
制御回路１１に内蔵されている電圧制御回路（図示せず
）によつて、やはり周波数基準に比例して上昇しよっう
とするが、前述のように、前記電流制御回路（図示せず
）がこれに優先しているので、停止状態ては上昇しない
。この状態は、電動機１にとつては、先に述べた不足励
磁の状態であり、所定のトルクを発生することが出来ず
、停止したままの状態をつづける事態となる。この場合
、電動機１は停止したままで、りミッタ値に等しい電流
が長時間流れつづけているので、冷却効果がないため、
ついには巻線焼損に至る。以上の如く、従来の方式にお
いては、機械側の異常等により、負荷過大で起動失敗し
た場合には、電動機を焼損するという欠点があつた。The frequency conversion device 2 gradually raises the frequency reference according to a predetermined acceleration time of the electric motor 1 using a ramp signal generator (not shown) built in the speed setting device 10. In line with this, the output voltage and output frequency will increase proportionally. In this case, the load torque is excessive, so the current increases in order to increase the motor torque, and finally the current limiting circuit (
(not shown) reaches the limiter value. Even in this state, the electric motor 1 does not start rotating because the load torque is still excessive. By the way, the output frequency of the frequency j-number converter 2 increases according to the frequency standard even if the electric motor 1 is not rotating. On the other hand, the output voltage of the frequency converter 2 is
The voltage control circuit (not shown) built in the control circuit 11 also tries to increase the frequency in proportion to the frequency reference, but as described above, the current control circuit (not shown) Since it has priority over the engine, it will not rise when stopped. This state is the above-mentioned underexcitation state for the electric motor 1, and the motor 1 is unable to generate a predetermined torque and remains in a stopped state. In this case, the motor 1 remains stopped and a current equal to the limiter value continues to flow for a long time, so there is no cooling effect.
Eventually, the windings will burn out. As described above, the conventional system has the disadvantage that if startup fails due to an excessive load due to an abnormality on the machine side, the motor will burn out.
この発明は、上記のような従来のものの欠点をノ除去す
るためになされたもので、周波数変換装置に対し電力検
出装置を付加することにより、起動失敗保護を行なうこ
とを目的としたものである。以下、この発明の一実施例
を第３図について説明する。第３図において、第１図及
び第２図における符号と同一部分を示すものについて符
号の説明は適宜省略する。第３図において、２１は直流
電圧検出装置、２２は直流電流検出装置、２３は直流電
圧検出装置２１と直流電流検出装置２２とからの出力信
号を掛け合せる掛算器である。２４は直流電圧検出装置
２１、直流電流検出装置２２、掛算器２３等から構成さ
れる電力検出装置である。This invention was made in order to eliminate the above-mentioned drawbacks of the conventional system, and aims to provide startup failure protection by adding a power detection device to the frequency conversion device. . An embodiment of the present invention will be described below with reference to FIG. In FIG. 3, explanations of the symbols indicating the same parts as those in FIGS. 1 and 2 will be omitted as appropriate. In FIG. 3, 21 is a DC voltage detection device, 22 is a DC current detection device, and 23 is a multiplier that multiplies the output signals from the DC voltage detection device 21 and the DC current detection device 22. Reference numeral 24 denotes a power detection device comprising a DC voltage detection device 21, a DC current detection device 22, a multiplier 23, and the like.
一般に誘導電動機の負荷となる機械の所要人力（電力）
は速度に対して増加するのが普通てある。Required human power (electric power) for the machine that is generally the load of the induction motor
Usually increases with speed.
たとえば、ポンプ、ブロワ等においては、所要人力（電
力）は概略速度の３乗に比例する。第３図において、直
流電圧検出装置２１、直流電流検出装置２２はいずれも
直流回路に接続されており、直流電圧検出装置２１と直
流電流検出装置２２とからの信号の積は、電動機１へ供
給される電力てある。（但し、回路の損失を無視する。
）また、電動機内部での損失は、小さいのて電動機１が
正常に負荷を駆動する状態では、上記掛算器２３からの
出力値は、電動機出力すなわち負荷の入力を表わしてい
る。もし、前述のように、起動時トルク不足により、起
動失敗したとすれば、そのような場合には、電動機１は
停止しているので、直流電圧検出装置２１と直流電流検
出装置２２とからの信号の積は回路損失及び電動機１内
部ての損失のみであり、電流は電流りミッタによつて制
限される値を持続する。For example, in pumps, blowers, etc., the required human power (electric power) is approximately proportional to the cube of the speed. In FIG. 3, the DC voltage detection device 21 and the DC current detection device 22 are both connected to a DC circuit, and the product of the signals from the DC voltage detection device 21 and the DC current detection device 22 is supplied to the motor 1. There is a power supply. (However, circuit loss is ignored.
) Furthermore, since the loss inside the motor is small, when the motor 1 normally drives the load, the output value from the multiplier 23 represents the motor output, that is, the input of the load. If, as mentioned above, the startup fails due to insufficient torque at startup, in such a case, since the motor 1 has stopped, the voltage from the DC voltage detection device 21 and the DC current detection device 22 will be The signal product is only circuit losses and losses within the motor 1, and the current remains at a value limited by the current limiter.
従つて、直流電圧検出装置２１と直流電流検出装置２２
とからの信号の積は一定の値を持続することになる。例
えば第３図に示す電流形インバータによつて、誘導電動
機を駆動するにあたり、起動時トルク不足により、起動
失敗した場合その起動失敗の検出について簡単に述べる
。Therefore, the DC voltage detection device 21 and the DC current detection device 22
The product of the signals from and will maintain a constant value. For example, when an induction motor is driven by the current source inverter shown in FIG. 3, and the startup fails due to insufficient torque at startup, detection of the startup failure will be briefly described.
電動機１に起動信号を与えた後、直流電圧検出装置２１
と直流電流検出装置２２の信号を掛算器２３によつて掛
け合せた積値が所定の時間を経過しても、所定の値に達
しない場合には、起動失敗として判別し、その判別結果
に基き、電動機１に対する停止信号を、上記制御回路１
１に与える等して、電動機１の損傷を保護する。尚、起
動失敗か否かについての電力検出装置２４における判別
結果により、上記制御回路１において電動機１への通電
を制御する例を示したが、例えば上記起動失敗について
の判別動作は、電力検出装置２４からの出力に基いて、
制御回路１１により行なうように構成してもよい。上記
実施例では、インバータは電流形インバータの場合につ
いて、電動機は誘導電動機の場合について説明したが、
これ等は夫々電圧形インバータ、同期電動機の場合につ
いても実施例と同様の効果を奏する。以上のように、こ
の発明によれば、電力検出装置を従来の回路に付加した
もので、起動失敗による電動機の保護が可能となる。After giving a starting signal to the electric motor 1, the DC voltage detection device 21
If the product value obtained by multiplying the signal from the DC current detection device 22 by the multiplier 23 does not reach a predetermined value even after a predetermined time has elapsed, it is determined that the startup has failed, and based on the determination result, , a stop signal to the electric motor 1 is sent to the control circuit 1.
1 to protect the motor 1 from damage. Although an example has been shown in which the control circuit 1 controls the energization of the electric motor 1 based on the determination result of the power detection device 24 as to whether or not there is a startup failure, for example, the determination operation regarding the startup failure is performed by the power detection device 24. Based on the output from 24,
The configuration may be such that the control circuit 11 performs this. In the above embodiment, the inverter is a current source inverter, and the motor is an induction motor.
These effects are similar to those of the embodiments in the case of a voltage source inverter and a synchronous motor, respectively. As described above, according to the present invention, by adding a power detection device to a conventional circuit, it is possible to protect a motor due to startup failure.
第１図は、誘導電動機の１次周波数制御の回路構成図、
第２図は電流形インバータを使用した場合の回路構成図
、第３図はこの発明の一実施例を示す回路構成図である
。
図において、１は誘導電動機、２は周波数変換装置、３
は周波数変換装置の主回路、４は周波数変換装置の制御
回路、５は１次開閉器、６はコンバータ（整流装置）、
７はインバータ（逆変換装置）、８は平滑リアクルト、
９は入力電流検出装置、１０は速度設定器（周波数設定
器）、１１は制御回路、２１は直流電圧検出装置、２２
は直流電流検出装置、２３は掛算器、２４は電力検出装
置である。
尚図中同一符号は同一或いは相当部分を示す。Figure 1 is a circuit diagram of primary frequency control of an induction motor.
FIG. 2 is a circuit configuration diagram when a current source inverter is used, and FIG. 3 is a circuit configuration diagram showing an embodiment of the present invention. In the figure, 1 is an induction motor, 2 is a frequency converter, and 3 is an induction motor.
is the main circuit of the frequency converter, 4 is the control circuit of the frequency converter, 5 is the primary switch, 6 is the converter (rectifier),
7 is an inverter (inverse conversion device), 8 is a smooth reactor,
9 is an input current detection device, 10 is a speed setting device (frequency setting device), 11 is a control circuit, 21 is a DC voltage detection device, 22
2 is a DC current detection device, 23 is a multiplier, and 24 is a power detection device. Note that the same reference numerals in the drawings indicate the same or corresponding parts.
Claims (1)
を駆動するものにおいて、上記インバータの直流側電圧
を検出する直流電圧検出装置、上記インバータの直流側
電流を検出する直流電流検出装置、並びに直流電圧検出
装置及び直流電流検出装置からの検出信号の積をとる掛
算器を備え、上記検出信号の積の値に応じて、上記電動
機への通電を停止するよう構成したことを特徴とする電
動機の駆動装置。1. In a device that drives a motor whose primary frequency is controlled by a self-excited inverter, a DC voltage detection device that detects the DC side voltage of the inverter, a DC current detection device that detects the DC side current of the inverter, and a DC voltage detection device. A driving device for an electric motor, comprising a multiplier that takes the product of detection signals from the device and the DC current detection device, and configured to stop energizing the electric motor according to the value of the product of the detection signals. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54131438A JPS6059840B2 (en) | 1979-10-11 | 1979-10-11 | Electric motor drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54131438A JPS6059840B2 (en) | 1979-10-11 | 1979-10-11 | Electric motor drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5656182A JPS5656182A (en) | 1981-05-18 |
| JPS6059840B2 true JPS6059840B2 (en) | 1985-12-26 |
Family
ID=15057960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54131438A Expired JPS6059840B2 (en) | 1979-10-11 | 1979-10-11 | Electric motor drive device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059840B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60182541U (en) * | 1984-05-16 | 1985-12-04 | 三菱自動車工業株式会社 | Engine roll stopper structure |
| JPH0678645U (en) * | 1993-04-15 | 1994-11-04 | 東海ゴム工業株式会社 | Liquid-filled anti-vibration device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58195472A (en) * | 1982-05-07 | 1983-11-14 | Mitsubishi Electric Corp | Output detecting circuit for inverter |
| JPS58217786A (en) * | 1982-06-09 | 1983-12-17 | Mitsubishi Electric Corp | Inverter circuit for inverter pump |
| JPS6139827A (en) * | 1984-07-28 | 1986-02-26 | 三菱電機株式会社 | Power source switching system |
-
1979
- 1979-10-11 JP JP54131438A patent/JPS6059840B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60182541U (en) * | 1984-05-16 | 1985-12-04 | 三菱自動車工業株式会社 | Engine roll stopper structure |
| JPH0678645U (en) * | 1993-04-15 | 1994-11-04 | 東海ゴム工業株式会社 | Liquid-filled anti-vibration device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5656182A (en) | 1981-05-18 |
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