JP4336132B2 - Water level sensorless single phase induction motor pump drought driving prevention device - Google Patents
Water level sensorless single phase induction motor pump drought driving prevention device Download PDFInfo
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- JP4336132B2 JP4336132B2 JP2003082874A JP2003082874A JP4336132B2 JP 4336132 B2 JP4336132 B2 JP 4336132B2 JP 2003082874 A JP2003082874 A JP 2003082874A JP 2003082874 A JP2003082874 A JP 2003082874A JP 4336132 B2 JP4336132 B2 JP 4336132B2
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- motor
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Description
【０００１】
【発明の技術分野】
本発明は、水位センサレス単相誘導モータポンプの渇水運転防止装置に関するものである。
【０００２】
【従来の技術】
電極やフロート等の水位センサを用いない水位センサレスポンプの運転制御については従来は、モータに供給される電圧と電流の位相差を検出する位相差検出手段と、その検出値が所定のしきい値に達したときに水中ポンプを停止させるポンプ制御手段を設けている（例えば、特許文献1参照）。
【０００３】
【特許文献１】
特開２００２−１２２０９３号公報 （要約）
【０００４】
【発明が解決しょうとする課題】
しかし特許文献１のように電流や力率を検出して無負荷の判別を行う方式のポンプでは、例えば供給される電源電圧が高ければ検出される力率が低下するため、あたかも負荷が軽減されたと誤判別されてしまう。即ち該供給電源の電圧変動や温度変化等外部の変動要因により影響されて上記検出値が運転状態を判別するための判別真正値と相違するため、制御精度が悪くて有効な渇水運転防止を期待することができない。
【０００５】
本発明の目的は、外部の変動要因に影響されることなく有効に機能する、水位センサレス単相誘導モータポンプの渇水運転防止防止装置を提供することにある。
【０００６】
【問題を解決するための手段】
本発明に係る水位センサレス単相誘導モータポンプの渇水運転防止装置では、単相誘導モータの主巻線の両端に補助巻線と運転用のコンデンサを直列接続したモータ補助回路を設けた単相誘導モータポンプの渇水運転防止装置において、上記主巻線の両端のモータ端子電圧を検出するモータ端子電圧検出回路と、上記運転用のコンデンサの両端のコンデンサ端子電圧を検出するコンデンサ端子電圧検出回路と、上記モータ主回路に付設された主回路開閉器と、上記モータ端子電圧検出回路およびコンデンサ端子電圧検出回路が入力側に接続され、それぞれの検出回路で検出されたモータ端子電圧とコンデンサ端子電圧に基づいて上記主回路開閉器を開閉するコントロールボックスとを備え、上記コントロールボックスは上記単相誘導モータの無負荷運転状態での上記モータ端子電圧と上記コンデンサ端子電圧の関係を表す数式１で求められるモータ固有の定数を設定すると共に、運転中における上記モータ端子電圧とコンデンサ端子電圧を比較する数式２により条件値が設定され、ポンプ渇水状態運転への移行条件としてタイミング定数を設定し、上記比較の数式２に達した時に渇水状態と判定して、上記主回路開閉器を動作させ上記モータ主回路を遮断する該主回路開閉器が半導体素子を主体とする無接点方式のもを採用することもある。
【０００７】
【発明の実施の態様】
以下の図１ないし図５の実施例により説明をする。
【０００８】
１はポンプ駆動用のモータ、２は主巻線、３は補助巻線、４は運転用のコンデンサ、５はモータ端子電圧検出回路、６はコンデンサ端子電圧検出回路、７はコントロールボックスであり、その入力側はモータ端子電圧検出回路５およびコンデンサ端子電圧検出回路６にそれぞれ接続されている。８はコントロールボックス７からの電気出力信号により開閉される主回路開閉器であり、図１に示されているよう可動部を有する有接点方式のものでよいが、図２に示されるようトライアック等の半導体素子を主体とする無接点方式のものとすることが望ましい。
【０００９】
本発明ではポンプ渇水運転状態がほぼ無負荷状態に近似するとして、コンデンサ４を用いた単相誘導モータの巻線に起因するモータ特性を利用し、無負荷運転状態でのモータ端子電圧とコンデンサ端子電圧との比率から求められるモータ固有の定数を定めるが、それについては下記の数式１が用いられる。
【００１０】
【数１】
【００１１】
次に上記モータ特性を基に運転中におけるモータ１内のモータ端子電圧およびコンデンサ端子電圧を検出・比較・判定をコントロールボックス７で行わせるが、それにつれては下記の数式２により所定の条件値が設定される。
【００１２】
【数２】
【００１３】
そしてポンプ渇水状態運転への移行条件として前記タイミング定数βを予め任意に設定し、前記数式２の条件値に達したときに、渇水状態と判定して主回路開閉器８によりモータ電源が供給されるモータ主回路を遮断するのであるが、主回路開閉器８を図２に示すよう、半導体素子を主体とする無接点方式のものとしておけば、接点荒れ等を生じることがなく、図１に示された有接点方式のものよりも有利となる。また、図３および図４に示された電圧変化率（△Ｖｃ／Ｖ１）は、負荷変動１０％に対して３％程度であるため、本実施例では概ね電圧変化率を５％レスと想定として、上記タイミング定数βを約０．９５に設定することが望ましい。そして本発明装置によるポンプ運転制御の流れは図５のようになる。
【００１４】
【発明の効果】
本発明によれば、外部の変動要因に影響されることなく有効に機能する、水位センサレス単相誘導モータポンプの渇水運転防止装置を提供することができる。
【図面の簡単な説明】
【図１】 本発明装置の回路図であって、主回路開閉器として可動部を有する有接点式のものを用いた事例を示す。
【図２】 本発明装置の回路図であって、主回路開閉器として半導体素子を主体とした無接点式のものを用いた事例を示す。
【図３】 本発明におけるモータ巻線に起因する、すべりとコンデンサ端子電圧の関係を示すモータ特性図である。
【図４】 本発明における入力電源の電圧変動状態での、すべりとコンデンサ端子電圧の関係を示すモータ特性図である。
【図５】 本発明によるポンプ運転制御を示すフローチャートである。
【符号の説明】
１ ポンプ駆動用のモータ
２ 主巻線
３ 補助巻線
４ 運転用のコンデンサ
５ モータ端子電圧検出回路
６ コンデンサ端子電圧検出回路
７ コントロールボックス
８ 主回路開閉器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to drought operation proof TomeSo location of the water level sensor-less single-phase induction motor pump.
[0002]
[Prior art]
Conventionally, for operation control of a water level sensorless pump that does not use a water level sensor such as an electrode or a float, a phase difference detecting means for detecting a phase difference between a voltage and a current supplied to the motor, and the detected value is a predetermined threshold Is provided with a pump control means for stopping the submersible pump (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-122093 (Summary)
[0004]
[Problems to be solved by the invention]
However, in the pump of the type that detects the no load by detecting the current and the power factor as in Patent Document 1, for example, the detected power factor decreases if the supplied power supply voltage is high, so that the load is reduced. It will be misclassified. That is, the detection value is affected by external fluctuation factors such as voltage fluctuation and temperature change of the power supply, and the detected value is different from the determination true value for determining the operation state. Can not do it.
[0005]
An object of the present invention is to provide functions effectively without being affected by the external variation factors, a drought driving preventing explosion TomeSo location of the water level sensor-less single-phase induction motor pump.
[0006]
[Means for solving problems]
In the water level sensorless single-phase induction motor pump drought driving prevention device according to the present invention, a single-phase induction provided with a motor auxiliary circuit in which an auxiliary winding and an operating capacitor are connected in series at both ends of the main winding of the single-phase induction motor. In a drought driving prevention device for a motor pump, a motor terminal voltage detection circuit for detecting a motor terminal voltage at both ends of the main winding, a capacitor terminal voltage detection circuit for detecting a capacitor terminal voltage at both ends of the operating capacitor, The main circuit switch attached to the motor main circuit, the motor terminal voltage detection circuit and the capacitor terminal voltage detection circuit are connected to the input side , and are based on the motor terminal voltage and the capacitor terminal voltage detected by each detection circuit. A control box for opening and closing the main circuit switch, the control box of the single-phase induction motor A constant specific to the motor determined by Equation 1 representing the relationship between the motor terminal voltage and the capacitor terminal voltage in a load operation state is set, and a condition is obtained by Equation 2 that compares the motor terminal voltage and the capacitor terminal voltage during operation. When a value is set and a timing constant is set as a condition for shifting to a pump drought state operation, when the above formula 2 is reached, it is determined that the drought state is reached and the main circuit switch is operated to shut off the motor main circuit. sometimes the main circuit switch which is adopted also for non-contact method mainly composed of semiconductor elements.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The following examples will be described with reference to FIGS.
[0008]
1 is a motor for driving a pump, 2 is a main winding, 3 is an auxiliary winding, 4 is a capacitor for operation, 5 is a motor terminal voltage detection circuit, 6 is a capacitor terminal voltage detection circuit, and 7 is a control box. The input side is connected to the motor terminal voltage detection circuit 5 and the capacitor terminal voltage detection circuit 6, respectively. Reference numeral 8 denotes a main circuit switch that is opened and closed by an electrical output signal from the control box 7 and may be of a contact type having a movable part as shown in FIG. 1, but a triac or the like as shown in FIG. It is desirable to use a non-contact type mainly composed of these semiconductor elements.
[0009]
In the present invention, assuming that the pump drought operation state approximates to a no-load state, the motor terminal voltage and the capacitor terminal in the no-load operation state are utilized using the motor characteristics resulting from the winding of the single-phase induction motor using the capacitor 4 While defining the motor-specific constant determined from the ratio of the voltage, equation 1 below SL is used for it.
[0010]
[Expression 1]
[0011]
Then it causes the control box 7 the detection, comparison, determination of the motor terminal voltage and the capacitor terminal voltage of the motor 1 during operation on the basis of the motor characteristics, the predetermined condition value according to Equation 2 below SL is as it Is set.
[0012]
[Expression 2]
[0013]
Then, the timing constant β is arbitrarily set in advance as a condition for shifting to the pump drought state operation. When the condition value of Formula 2 is reached, it is determined that the condition is a drought state, and the motor power is supplied from the main circuit switch 8. If the main circuit switch 8 is made of a non-contact type mainly composed of semiconductor elements as shown in FIG. This is advantageous over the contact type shown. Further, FIG. 3 and the voltage change rate shown in FIG. 4 (△ Vc / V1), since the load fluctuation of 10% is about 3% to approximately the voltage change rate in the present embodiment and 5% less virtual as a constant, it is desirable to set to about 0.95 to the timing constant beta. The flow of the pump operation control according to this onset AkiraSo location is as shown in FIG.
[0014]
【The invention's effect】
According to the present invention, it is possible to provide effectively function without being affected by the external variable factors, the drought operation proof TomeSo location of the water level sensor-less single-phase induction motor pump.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a device according to the present invention, showing a case where a contact type having a movable part is used as a main circuit switch.
FIG. 2 is a circuit diagram of the device of the present invention, showing an example in which a non-contact type mainly composed of semiconductor elements is used as a main circuit switch.
FIG. 3 is a motor characteristic diagram showing the relationship between slip and capacitor terminal voltage caused by the motor winding in the present invention.
FIG. 4 is a motor characteristic diagram showing the relationship between slip and capacitor terminal voltage in the voltage fluctuation state of the input power supply according to the present invention.
FIG. 5 is a flowchart showing pump operation control according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor for driving pump 2 Main winding 3 Auxiliary winding 4 Capacitor for operation 5 Motor terminal voltage detection circuit 6 Capacitor terminal voltage detection circuit 7 Control box 8 Main circuit switch
Claims (2)
In a single-phase induction motor pump drought driving prevention device provided with a motor auxiliary circuit in which an auxiliary winding and an operating capacitor are connected in series at both ends of a main winding of a single-phase induction motor, motor terminals at both ends of the main winding A motor terminal voltage detection circuit for detecting a voltage; a capacitor terminal voltage detection circuit for detecting a capacitor terminal voltage at both ends of the operation capacitor; a main circuit switch attached to the motor main circuit; and the motor terminal voltage. detection circuit and the capacitor terminal voltage detecting circuit is connected to the input side, and a control box for opening and closing the main circuit switch based on the respective detected by the detecting circuit the motor terminal voltage and the capacitor terminal voltage, the control box Indicates the relationship between the motor terminal voltage and the capacitor terminal voltage when the single-phase induction motor is in a no-load operation state. In addition to setting the motor-specific constant obtained by Formula 1, the condition value is set by Formula 2 that compares the motor terminal voltage and the capacitor terminal voltage during operation, and the timing constant is set as a condition for shifting to pump drought operation Then, it is determined that a drought condition is reached when the above mathematical formula 2 is reached, and the main circuit switch is operated to shut off the motor main circuit, thereby preventing drought operation of the water level sensorless single-phase induction motor pump apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003082874A JP4336132B2 (en) | 2003-03-25 | 2003-03-25 | Water level sensorless single phase induction motor pump drought driving prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003082874A JP4336132B2 (en) | 2003-03-25 | 2003-03-25 | Water level sensorless single phase induction motor pump drought driving prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004293321A JP2004293321A (en) | 2004-10-21 |
| JP4336132B2 true JP4336132B2 (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003082874A Expired - Fee Related JP4336132B2 (en) | 2003-03-25 | 2003-03-25 | Water level sensorless single phase induction motor pump drought driving prevention device |
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| Country | Link |
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| JP (1) | JP4336132B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6486806B2 (en) * | 2015-09-28 | 2019-03-20 | 株式会社フロム工業 | Disposer |
| CN112798075A (en) * | 2020-12-23 | 2021-05-14 | 珠海格力电器股份有限公司 | Water level detection method and device for cooling fan and cooling fan |
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| Publication number | Publication date |
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| JP2004293321A (en) | 2004-10-21 |
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