JPS60134783A

JPS60134783A - Start controller of reciprocating machine driving motor

Info

Publication number: JPS60134783A
Application number: JP24319783A
Authority: JP
Inventors: Mario Hamaguchi; 浜口　真理雄
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1983-12-22
Filing date: 1983-12-22
Publication date: 1985-07-18
Also published as: JPH0124036B2

Abstract

PURPOSE:To reduce the output current capacity of an inverter by temporarily stopping the start when the rotating direction that a starting torque increase is detected, switching to a rotating direction that the torque decreases, and restarting. CONSTITUTION:An inverter 5 is energized to start a compressor to generate an AC output for driving a compressor in a normal rotating direction. When the angular position of the crankshaft of the compressor at the starting time is at theta1, the rotating direction is to decrease the torque, and it can be readily driven. On the other hand, when the angular position of the crankshaft at starting time is at theta2, it is hardly started, and a large starting current flows. When an overcurrent is detected by a current detector 10, a controller 7 immediately stops the output of the inverter 5. After it is reversely rotated for the prescribed time, the crankshaft is then restarted in a reverse direction.

Description

【発明の詳細な説明】〔発明の技術分野〕この発明は、往復圧縮機のような往復動機器の駆動電動
機をインバータによって起動運転制御する往復動機器駆
動電動機の制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a control device for a reciprocating equipment drive motor that controls the starting operation of a reciprocating equipment drive motor such as a reciprocating compressor using an inverter.

〔従来技術〕[Prior art]

第１図は、往復圧縮機（レシグロ型コンプレッサ）の、
駆動軸であるクランク軸の回転角度位置に対する起動ト
ルクの大きさを示す。図に示すように、往復圧縮機は起
動時のクランク軸角度により。Figure 1 shows a reciprocating compressor (reciprocating type compressor).
It shows the magnitude of the starting torque with respect to the rotational angular position of the crankshaft, which is the drive shaft. As shown in the figure, reciprocating compressors depend on the crankshaft angle at startup.

起動トルクが大きく異なるが、当然起動トルクが太きけ
れば、駆動電動機の起動電流も大きくなる。The starting torque differs greatly, but naturally the larger the starting torque, the larger the starting current of the drive motor.

従ってインバータによって可変周波数制御を行なう場合
、最大トルク時の最大起動電流以上の出力電流容量を持
つインバータを必要とする。一方。Therefore, when performing variable frequency control using an inverter, an inverter is required that has an output current capacity greater than the maximum starting current at maximum torque. on the other hand.

一旦起動してしまえば、慣性によってクランク軸角度に
よるトルク変動も少なくなり、圧縮機駆動電動機への入
力電流は減少するため、運転状態の入力電流に対してイ
ンバータの出力電流各階は過大となり、インバータのコ
ストが高くなるという欠点があった。Once started, the torque fluctuation due to the crankshaft angle will be reduced due to inertia, and the input current to the compressor drive motor will be reduced, so the inverter's output current at each stage will be excessive compared to the input current in the operating state, and the inverter will The disadvantage was that the cost was high.

〔発明の概要〕[Summary of the invention]

この発明は以上の点に鑑みなされたもので、往復動機器
駆動電動機の起動トルクが、クランク軸の回転方向によ
り異なり、どちらか一方の起動トルクが小さくなるので
、過大なインバータ入力電流を電流検出器によって検出
することにより、起動トルクが大きくなる回転方向を検
出したら、起動を一時停止させ起動トルクが小さくなる
回転方向に切換えて再起動するようにして、容喰の小さ
いインバータでも往復動機器駆動電動機の起動運転制御
の可能な起動制御装置を提供しようとするものである。This invention was made in view of the above points, and the starting torque of the reciprocating equipment drive motor differs depending on the direction of rotation of the crankshaft, and the starting torque of one of them becomes smaller, so excessive inverter input current is detected by current detection. When a rotation direction in which the starting torque is large is detected, the starting torque is temporarily stopped, and the starting torque is switched to a rotational direction in which the starting torque is small and then restarted.Even a small capacity inverter can drive reciprocating equipment. The present invention aims to provide a starting control device capable of controlling the starting operation of an electric motor.

〔発明の実施例〕第２図は、この発明の一実施例を示すブロック線図で、
（１１は商用３相交流電源、（２）は交流電源ｉｌｌか
らの交流入力を整流するコンバータ回路、（３）は平滑
用コンデンサで、　ｉｌｌ　＋２１　＋３）で直流電源
回１Ｍ　＋４１を構成している。（５）はインバータ回
路、（６）はこれの３相交流出力回路、（７）はインバ
ータ回路（５）の発生周波数、相回転方向、出力電圧値
等をきめる制御回路、（８）は制御回路（７）からのデ
ータによりインバータの発生交流出力の周波数１位相、
電圧値をきめるＰＷＭ（パルス幅変調波）波形制御信号
を発生する制御信号発生回路、（９）は制御回路（７）
からの指令によって制御信号発生回路（８）からのＰＷ
Ｍ波形の出力位相を切換え、インバータ回路（５）から
の３相交流出力の相回転方向を切換える正転逆転切換回
路、αυはインバータ回路（５）の直流入力電流の所定
値以上の過電流を検出する電流検出回路である。[Embodiment of the Invention] FIG. 2 is a block diagram showing an embodiment of the invention.
(11 is a commercial three-phase AC power supply, (2) is a converter circuit that rectifies the AC input from the AC power supply ill, and (3) is a smoothing capacitor. ill +21 +3) constitutes a DC power supply circuit 1M +41. . (5) is the inverter circuit, (6) is its 3-phase AC output circuit, (7) is the control circuit that determines the frequency, phase rotation direction, output voltage value, etc. of the inverter circuit (5), and (8) is the control circuit. The frequency 1 phase of the AC output generated by the inverter is determined by the data from the circuit (7),
Control signal generation circuit that generates a PWM (pulse width modulation wave) waveform control signal that determines the voltage value, (9) is the control circuit (7)
The PW from the control signal generation circuit (8) is
A forward/reverse switching circuit that switches the output phase of the M waveform and switches the phase rotation direction of the three-phase AC output from the inverter circuit (5). This is a current detection circuit for detection.

次にその動作全説明する。上記インバータ回路（５）で
は、制御信号発生回路（８）からのＰＷＭ波形に応じて
、直流電圧をスイッチングし、制御回路（７）によって
設定され、制御信号発生回路（８）からのＰＷＭ波形に
よりきめられた周波数）位相及び電圧値の交流出力を発
生し、往復圧縮機駆動電動機を付勢する。Next, the entire operation will be explained. The inverter circuit (5) switches the DC voltage according to the PWM waveform from the control signal generation circuit (8), and switches the DC voltage according to the PWM waveform from the control signal generation circuit (8) set by the control circuit (7). Generates an AC output of a determined frequency) phase and voltage value to energize the reciprocating compressor drive motor.

先ず、圧縮機の起動にあたって、インバータ回Ｍ　＋５
１　’に付勢し、圧縮機を正回転方向に駆動する交流出
力を発生させる。こ＼で、この起動時の圧縮機クランク
軸の角度位置が第１図のθ、にあれば。First, when starting the compressor, the inverter turns M +5
1' to generate an AC output that drives the compressor in the forward rotation direction. Now, if the angular position of the compressor crankshaft at startup is at θ in Figure 1.

回転方向はトルクが低下する方向でおるため、容易に起
動でき、一旦起動すれば慣性により、θ３のような高ト
ルク点も乗り越え加速される。一方。Since the rotating direction is in the direction in which the torque decreases, it can be started easily, and once started, the inertia allows it to overcome a high torque point such as θ3 and accelerate. on the other hand.

起動時のクランク軸の角度位置が０２にあれば１回転方
向はトルクが高くなる方向であり、かつその位置の起動
トルクも大きいため、起動しに＜＜。If the angular position of the crankshaft at the time of starting is 02, the torque will be high in the direction of one rotation, and the starting torque at that position is also large, so it is difficult to start.

大きな起動電流が流れ、それがインバータ（５）の直流
入力電流の過電流となり、電流検出回路ａΦによってそ
れが検出される。この検出信号を受けると制御回路（７
）では、直ちにインバータ回路（５）の出力全停止させ
る。その後一定時同経１７Ｍ１正転逆転切換回両４（９
）に信号を与え、相回転を逆゛転させて、クランク軸を
逆回転方向に再起動する。こ＼で逆回転すればクランク
軸の角度位置θ２ではトルク減少方向の回転方向となり
、容易に起動できることになる。A large starting current flows, which becomes an overcurrent of the DC input current of the inverter (5), which is detected by the current detection circuit aΦ. When this detection signal is received, the control circuit (7
), all outputs of the inverter circuit (5) are immediately stopped. After that, at a certain time, 17M1 forward/reverse switching times both 4 (9
), the phase rotation is reversed, and the crankshaft is restarted in the reverse rotation direction. If the crankshaft is rotated in the opposite direction in this manner, the rotation direction will be in the torque decreasing direction at the angular position θ2 of the crankshaft, and it will be possible to start it easily.

なお、上記実施例では往復圧縮機を駆動する場合を説明
したが、この発明は他の往復動機器駆動にも適用できる
ことは明らかであり、又直流電源としても商用３相交流
をコンバータで整流した例を示したが、電池等の他の直
流電源をも利用し得るはもちろんである。Although the above embodiment describes the case of driving a reciprocating compressor, it is clear that the present invention can be applied to driving other reciprocating equipment, and can also be used as a DC power source by rectifying commercial three-phase AC with a converter. Although an example has been shown, it is of course possible to use other DC power sources such as batteries.

〔発明の効果〕〔Effect of the invention〕

この発明は以上のように構成したため、常に。 Since this invention is configured as above, always.

圧縮機等の往復動機器の起動トルクが小さくなり。The starting torque of reciprocating equipment such as compressors is reduced.

起動容易な方向に回転させることができるため。Because it can be rotated in a direction that is easy to start.

構成が簡単で、かつ出力電流容緻が小さくでき。The configuration is simple and the output current can be small.

直流電源回路、インバータ回路の定格を下げることがで
き、低コストにできる効果がある。The rating of the DC power supply circuit and inverter circuit can be lowered, which has the effect of lowering costs.

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

第１図は、往復動機器の起動時のクランク軸角度と起動
トルクの関係を示す図、第２図はこの発明の一実施例を
示す回路図である。図において、（４）は直流電源回路、（５）はインバー
タ回路、（６）はそれの交流出力回路、（７）は制御回
路。（８）は制御信号発生回路、（９）は正転逆転切換回路
。ａｏは電流検出回路である。代理人　大　岩　増　雄（ほか２名）FIG. 1 is a diagram showing the relationship between the crankshaft angle and the starting torque at the time of starting a reciprocating device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, (4) is a DC power supply circuit, (5) is an inverter circuit, (6) is its AC output circuit, and (7) is a control circuit. (8) is a control signal generation circuit, and (9) is a forward/reverse switching circuit. ao is a current detection circuit. Agent Masuo Oiwa (and 2 others)

Claims

【特許請求の範囲】直流電源回路、この電源回路により付勢され所望周波数
の多相交流出力を得るインバータ回路。このインバータ回路の発生周波数、電圧値相回転方向を
設定する制御回路、及びこの制御回路からのデータによ
り上記インバータの発生交流出力の周波数２位相、電圧
値をきめる制御信号を発生する制御信号発生回路を備え
、上記インバータ回路の出力によって、往復動機器駆動
電動機を起動し。運転し制御するようにした往復動機器駆動電動機の起動
制御装置において、上記インバータの直流入力電流の過
電流を検出する電流検出回路と、上記インバータの相回
転方向を切換える正転運転切換回路とを設け、上記電流
検出回路による起動時の過電流検出により、上記制御回
路によって、上記インバータ回路の電動機起動動作を所
定時間停止させた後、上記正転逆転切換回路を動作させ
上記インバータの相回転方向を切換えて再起動を行なう
ようにしたことを特徴とする往復動機器駆動電動機の起
動制御装置。[Claims] A DC power supply circuit, and an inverter circuit energized by the power supply circuit to obtain a multiphase AC output at a desired frequency. A control circuit that sets the generation frequency, voltage value phase rotation direction of this inverter circuit, and a control signal generation circuit that generates a control signal that determines the frequency two phases and voltage value of the generated AC output of the inverter based on data from this control circuit. and starts a reciprocating equipment drive motor by the output of the inverter circuit. A starting control device for a reciprocating equipment drive motor that operates and controls a reciprocating equipment drive motor includes a current detection circuit that detects an overcurrent in the DC input current of the inverter, and a forward rotation operation switching circuit that switches the phase rotation direction of the inverter. When the current detection circuit detects an overcurrent at startup, the control circuit stops the motor startup operation of the inverter circuit for a predetermined period of time, and then operates the forward/reverse rotation switching circuit to change the phase rotation direction of the inverter. 1. A start control device for a reciprocating equipment drive motor, characterized in that the restart is performed by switching the .