JPH0221240B2 - - Google Patents
Info
- Publication number
- JPH0221240B2 JPH0221240B2 JP57014361A JP1436182A JPH0221240B2 JP H0221240 B2 JPH0221240 B2 JP H0221240B2 JP 57014361 A JP57014361 A JP 57014361A JP 1436182 A JP1436182 A JP 1436182A JP H0221240 B2 JPH0221240 B2 JP H0221240B2
- Authority
- JP
- Japan
- Prior art keywords
- hysteresis motor
- power supply
- power factor
- current
- power
- 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
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- Control Of Ac Motors In General (AREA)
Description
【発明の詳細な説明】
発明の技術分野
本発明はヒステリシス電動機の監視装置に関す
る。TECHNICAL FIELD OF THE INVENTION The present invention relates to a monitoring device for a hysteresis motor.
発明の技術的背景とその問題点
従来、ヒステリシス電動機が電源周波数に対し
て同期運転中にあるか、非同期運転中にあるかを
判定する方法としては、ヒステリシス電動機の逆
起電圧測定法、ヒステリシス電動機入力力率検出
法および電源の出力電流検出法等がある。しか
し、ヒステリシス電動機の逆起電圧測定法はアナ
ログ的にヒステリシス電動機の回転数を検出する
ための監視方法であるので、ヒステリシス電動機
が単に電源周波数と同期状態にあるか、あるいは
非同期状態にあるかを判定するだけのためにはコ
スト的に過大な設備である。また、ヒステリシス
電動機はすべりによらず定電流特性をもつが、非
同期時と同期時では入力電圧に対する入力電流の
力率が異なる。この力率の変動分を検知してヒス
テリシス電動機が同期運転に入つたことを判定す
る方法が、ヒステリシス電動機入力力率検出法で
ある。さらに、ヒステリシス電動機自身は定電流
特性を有しているが、力率改善用のコンデンサ電
流と合成した電源の出力電流は、ヒステリシス電
動機が同期運転に入ると幾分減少する。この電流
減少分を検知してヒステリシス電動機が同期運転
に入つたことを判定する方法が、電源の出力電流
検出法である。しかし、この２つの判定方法は、
検出すべき力率や電流値の変動分が微少なため、
検出器にかなりの精度の良いものが要求される。Technical background of the invention and its problems Conventionally, methods for determining whether a hysteresis motor is operating synchronously or asynchronously with respect to the power supply frequency include a method for measuring back electromotive force of a hysteresis motor, and a method for measuring back electromotive force of a hysteresis motor. There are input power factor detection methods, power supply output current detection methods, etc. However, since the back electromotive force measurement method of a hysteresis motor is a monitoring method for detecting the rotation speed of a hysteresis motor in an analog manner, it can be used to detect whether the hysteresis motor is simply in synchronization with the power supply frequency or out of synchronization. The cost is too high for equipment just for making judgments. Furthermore, although a hysteresis motor has constant current characteristics regardless of slip, the power factor of the input current with respect to the input voltage differs between asynchronous and synchronous times. A method for determining whether the hysteresis motor has entered synchronous operation by detecting this power factor variation is the hysteresis motor input power factor detection method. Furthermore, although the hysteresis motor itself has constant current characteristics, the output current of the power supply combined with the power factor correction capacitor current decreases somewhat when the hysteresis motor enters synchronous operation. A method for detecting the output current of a power supply is a method of detecting this current decrease and determining that the hysteresis motor has entered synchronous operation. However, these two judgment methods are
Since the fluctuations in power factor and current value to be detected are minute,
A highly accurate detector is required.
発明の目的
本発明は、上記の点に鑑みてなされたもので、
その目的は汎用の計測器を用いてヒステリシス電
動機が同期運転中にあるかあるいは非同期運転中
にあるかを判定するヒステリシス電動機の監視シ
ステムを提供するにある。Purpose of the invention The present invention has been made in view of the above points, and
The purpose is to provide a hysteresis motor monitoring system that uses a general-purpose measuring instrument to determine whether the hysteresis motor is in synchronous operation or asynchronous operation.
発明の概要
本発明は、上記の目的を達成するために、電源
と、前記電源にスイツチング機構を介して接続さ
れたヒステリシス電動機と、前記電源と前記スイ
ツチング機構との間でかつ前記電源及び前記ヒス
テリシス電動機に並列に接続された力率改善用コ
ンデンサと、前記電源と前記力率改善用コンデン
サとの間に接続された力率計とを備え、ヒステリ
シス電動機の運転中にスイツチング機構の開閉を
連続して行ない力率計の指示が進みであるか遅れ
であるかによつてヒステリシス電動機が同期運転
中か非同期運転中かであるかを判定するようにし
たものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a power supply, a hysteresis motor connected to the power supply via a switching mechanism, and a hysteresis motor connected to the power supply and the switching mechanism between the power supply and the switching mechanism. A power factor correction capacitor connected in parallel to the motor and a power factor meter connected between the power source and the power factor correction capacitor are provided, and the switching mechanism is continuously opened and closed during operation of the hysteresis motor. According to whether the power factor meter indicates lead or lag, it is determined whether the hysteresis motor is in synchronous operation or asynchronous operation.
発明の実施例 本発明の一実施例を図面を参照して説明する。Examples of the invention An embodiment of the present invention will be described with reference to the drawings.
第１図は本発明のヒステリシス電動機の監視シ
ステムを設けたヒステリシス電動機駆動系の概略
回路図である。すなわち、電源１に手動スイツチ
２を介してヒステリシス電動機３が接続されてお
り、また、力率改善用コンデンサ４がヒステリシ
ス電動機３と電源１に対して並列に接続されてい
る。そして、電源１の出力端に計測用変圧器５と
計測用変流器６が取り付けられていて、これら計
測器５，６の他端には力率計７が接続されてい
る。 FIG. 1 is a schematic circuit diagram of a hysteresis motor drive system equipped with a hysteresis motor monitoring system according to the present invention. That is, a hysteresis motor 3 is connected to a power supply 1 via a manual switch 2, and a power factor correction capacitor 4 is connected in parallel to the hysteresis motor 3 and the power supply 1. A measuring transformer 5 and a measuring current transformer 6 are attached to the output end of the power source 1, and a power factor meter 7 is connected to the other ends of these measuring devices 5 and 6.
次に、その作用を説明する。第２図は電源電圧
Ｖに対するヒステリシス電動機３の入力電流、力
率改善用コンデンサ４の補償電流及び電源１の出
力電流のベクトル図で本発明の原理を説明するも
のである。すなわち、電流Ｉはヒステリシス電動
機が非同期運転中の入力電流、電流ISはヒステリ
シス電動機が同期運転中の入力電流であるが、そ
の力率はいずれも悪く、前者が0.3程度、後者が
0.2程度である。したがつて、ヒステリシス電動
機３の運転には力率改善用コンデンサ４が必要
で、その補償電流ICによつて上記電流ＩおよびIS
をそれぞれ電流IGおよびIGSのように電流値、力率
ともに改善する。つまり、電源１の出力電流IGお
よびIGSが第２図に示すように遅れ力率0.7〜0.8程
度になるように力率改善用コンデンサ４の容量を
決める。 Next, its effect will be explained. FIG. 2 is a vector diagram of the input current of the hysteresis motor 3, the compensation current of the power factor correction capacitor 4, and the output current of the power supply 1 with respect to the power supply voltage V to explain the principle of the present invention. In other words, the current I is the input current when the hysteresis motor is in asynchronous operation, and the current I S is the input current when the hysteresis motor is in synchronous operation, but both have bad power factors, with the former being around 0.3 and the latter being around 0.3.
It is about 0.2. Therefore, a power factor correction capacitor 4 is required to operate the hysteresis motor 3, and its compensation current I C reduces the above-mentioned currents I and I S
Both the current value and power factor are improved as shown in the current I G and I GS , respectively. That is, the capacitance of the power factor improving capacitor 4 is determined so that the output currents IG and IGS of the power supply 1 have a lagging power factor of about 0.7 to 0.8 as shown in FIG.
また、ヒステリシス電動機３は、同期運転中に
一度電源１より切離し再投入すると、その入力電
流が減少するにもかかわらず、出力パワーが一様
に保たれるいわゆる過励磁現象を発生すること
が、過去の運転経験より知られている。この過励
磁現象は同期運転時特有のもので、ヒステリシス
電動機３が非同期運転中にある時には、ヒステリ
シス電動機３のロータが、電源１の周波数に対し
てすべつているために、上記したような過励磁現
象は発生しない。この過励磁状態におけるヒステ
リシス電動機３の入力電流は第２図の電流ISEの
ようになる。この電流ISEに先の力率改善用コン
デンサ４の補償電流ICを加え合わせると、電源１
の出力電流IGSEは第２図のように電源電圧に対し
て進みに転じることになる。このようなヒステリ
シス電動機３の入力電流特性を利用して、ヒステ
リシス電動機３が同期運転中にあるかあるいは非
同期運転中にあるかを判定するものである。つま
り、ヒステリシス電動機３が運転中に手動スイツ
チ２にて、一度電源１より切離し、再び投入し、
その後電源１の出力電流の力率を力率計７にて観
察する。このとき、ヒステリシス電動機３が同期
運転中であれば、進み電流が観察され、また、非
同期運転中であれば、遅れ電流が観察される。そ
して、この手動スイツチ２による切離し、再投入
の操作を周期的に実施すれば、ヒステリシス電動
機３の監視を連続的に行うことが出来る。 Furthermore, if the hysteresis motor 3 is once disconnected from the power supply 1 during synchronous operation and then turned on again, a so-called overexcitation phenomenon occurs in which the output power remains constant even though the input current decreases. Known from past driving experience. This overexcitation phenomenon is unique to synchronous operation, and when the hysteresis motor 3 is in asynchronous operation, the rotor of the hysteresis motor 3 is slipping with respect to the frequency of the power supply 1, so the above-mentioned overexcitation phenomenon occurs. The phenomenon does not occur. The input current of the hysteresis motor 3 in this overexcited state becomes the current I SE in FIG. 2. By adding the compensation current I C of the power factor correction capacitor 4 to this current I SE , the power supply 1
The output current I GSE starts to lead with respect to the power supply voltage as shown in Figure 2. By utilizing such input current characteristics of the hysteresis motor 3, it is determined whether the hysteresis motor 3 is in synchronous operation or in asynchronous operation. In other words, while the hysteresis motor 3 is operating, use the manual switch 2 to disconnect it from the power source 1 and then turn it on again.
Thereafter, the power factor of the output current of the power source 1 is observed using a power factor meter 7. At this time, if the hysteresis motor 3 is in synchronous operation, a leading current is observed, and if it is in asynchronous operation, a lagging current is observed. If the manual switch 2 is periodically operated to disconnect and reconnect, the hysteresis motor 3 can be continuously monitored.
他の実施例を第３図に示す。第１図の実施例の
手動スイツチ２の代わりにトランジスタ・スイツ
チ８を使用したことに特徴がある。このトランジ
スタ・スイツチ８によつてヒステリシス電動機３
を電源１とON／OFFすれば、上記の実施例と同
様にヒステリシス電動機３が同期運転中であれば
進み電流が、また非同期運転中であれば遅れ電流
が観察される。さらに、上記の過励磁現象発生の
為には、電源１の周波数つまりヒステリシス電動
機３の回転数が高い場合、高速のスイツチング動
作が要求されるが、トランジスタ・スイツチ８は
高速のスイツチング動作が可能であるので、この
ようなシステムの場合にも供することができる。 Another embodiment is shown in FIG. A feature of this embodiment is that a transistor switch 8 is used in place of the manual switch 2 of the embodiment shown in FIG. Hysteresis motor 3 is controlled by this transistor switch 8.
When the power source 1 is turned on and off, a leading current is observed if the hysteresis motor 3 is in synchronous operation, and a lag current is observed if it is in asynchronous operation, as in the above embodiment. Furthermore, in order to generate the above-mentioned overexcitation phenomenon, when the frequency of the power supply 1, that is, the rotation speed of the hysteresis motor 3, is high, a high-speed switching operation is required, but the transistor switch 8 is capable of high-speed switching operation. Therefore, it can also be used in such a system.
発明の効果
以上説明したように、本発明によれば、ヒステ
リシス電動機が同期運転中にあるか非同期運転中
にあるかを判定するのに力率が進みであるか遅れ
であるかを検知するだけでよいから、その判定は
確実であり、かつ監視設備も安価なものとするこ
とができる。Effects of the Invention As explained above, according to the present invention, it is only necessary to detect whether the power factor is leading or lagging in order to determine whether the hysteresis motor is in synchronous operation or asynchronous operation. Therefore, the determination is reliable and the monitoring equipment can be made inexpensive.
第１図および第３図はいずれも本発明の実施例
で、監視設備を含むヒステリシス電動機の概略回
路図、第２図は本発明の原理を説明するヒステリ
シス電動機の入力電流等のベクトル図である。
１……電源、２……手動スイツチ、３……ヒス
テリシス電動機、４……力率改善用コンデンサ、
５……計測用変圧器、６……計測用変流器、７…
…力率計、８……トランジスタスイツチ。
FIG. 1 and FIG. 3 are both embodiments of the present invention, and are a schematic circuit diagram of a hysteresis motor including monitoring equipment, and FIG. 2 is a vector diagram of input current, etc. of the hysteresis motor to explain the principle of the present invention. . 1...Power supply, 2...Manual switch, 3...Hysteresis motor, 4...Power factor correction capacitor,
5...Measurement transformer, 6...Measurement current transformer, 7...
...Power factor meter, 8...Transistor switch.
Claims (1)
て接続されたヒステリシス電動機と、前記電源と
前記スイツチング機構との間でかつ前記電源及び
前記ヒステリシス電動機に並列に接続された力率
改善用コンデンサと、前記電源と前記力率改善用
コンデンサとの間に接続された力率計とを備え、
前記ヒステリシス電動機の運転中に前記スイツチ
ング機構の開閉を行い、前記力率計が進みか遅れ
かにより前記ヒステリシス電動機が電源周波数に
対して同期運転中か非同期運転中かを判定するよ
うに構成したことを特徴とするヒステリシス電動
機の監視装置。1 a power supply, a hysteresis motor connected to the power supply via a switching mechanism, a power factor correction capacitor connected between the power supply and the switching mechanism and in parallel to the power supply and the hysteresis motor; comprising a power factor meter connected between a power source and the power factor correction capacitor,
The switching mechanism is opened and closed during operation of the hysteresis motor, and it is determined whether the hysteresis motor is operating synchronously or asynchronously with respect to the power supply frequency based on whether the power factor meter is leading or lagging. A hysteresis motor monitoring device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57014361A JPS58133198A (en) | 1982-02-02 | 1982-02-02 | Monitoring system for hysteresis motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57014361A JPS58133198A (en) | 1982-02-02 | 1982-02-02 | Monitoring system for hysteresis motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58133198A JPS58133198A (en) | 1983-08-08 |
| JPH0221240B2 true JPH0221240B2 (en) | 1990-05-14 |
Family
ID=11858918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57014361A Granted JPS58133198A (en) | 1982-02-02 | 1982-02-02 | Monitoring system for hysteresis motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58133198A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3778401D1 (en) * | 1986-01-31 | 1992-05-27 | Casio Computer Co Ltd | WAVEFORM FOR AN ELECTRONIC MUSIC INSTRUMENT. |
| DE19953295B4 (en) * | 1999-11-05 | 2008-11-06 | Urenco Deutschland Gmbh | Method for operating, controlling and controlling hysteresis motors |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5195231A (en) * | 1975-02-19 | 1976-08-20 |
-
1982
- 1982-02-02 JP JP57014361A patent/JPS58133198A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58133198A (en) | 1983-08-08 |
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