JPH0533753B2 - - Google Patents
Info
- Publication number
- JPH0533753B2 JPH0533753B2 JP12554386A JP12554386A JPH0533753B2 JP H0533753 B2 JPH0533753 B2 JP H0533753B2 JP 12554386 A JP12554386 A JP 12554386A JP 12554386 A JP12554386 A JP 12554386A JP H0533753 B2 JPH0533753 B2 JP H0533753B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic flux
- flux density
- iron loss
- change
- time
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 125
- 229910052742 iron Inorganic materials 0.000 claims description 63
- 230000004907 flux Effects 0.000 claims description 50
- 230000002123 temporal effect Effects 0.000 claims description 2
- 239000011162 core material Substances 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 11
- 238000004804 winding Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 150000002505 iron Chemical class 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は電磁応用機器、例えば変圧器に印加
される矩形の電圧波形について鉄損を測定する鉄
損計測器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an iron loss measuring instrument that measures iron loss with respect to a rectangular voltage waveform applied to electromagnetic application equipment, such as a transformer.
第７図は従来の鉄損計測器を示す回路図であ
り、図において、２２は正弦波電圧の電源、２３
は電圧検出器、２４は電流検出器、２５は供試変
圧器、２６は変圧器２５の１次巻線、２７は磁束
検出用巻線を兼ねる２次巻線、２８は乗算器、２
９は積分器、３０は鉄損表示器である。
FIG. 7 is a circuit diagram showing a conventional iron loss measuring instrument. In the figure, 22 is a sine wave voltage power supply, 23
24 is a voltage detector, 24 is a current detector, 25 is a test transformer, 26 is a primary winding of the transformer 25, 27 is a secondary winding that also serves as a magnetic flux detection winding, 28 is a multiplier, 2
9 is an integrator, and 30 is an iron loss indicator.
次に動作について説明する。 Next, the operation will be explained.
まず、供試変圧器２５の１次巻線２６に電源２
２から正弦波電圧を印加して１次巻線２６に励磁
電流を流し、この電流を電流検出器２４で計測す
る。また、印加した電圧は電圧検出器２３で計測
して、この電圧と上記電流の瞬時値を夫々乗算器
２８で掛けあわせて電力を求める。この電力値は
鉄損を示すものであり、これを供試変圧器２５の
鉄心重量で除し、単位重量当り（一般に１Kg）の
損失で表わす。磁束密度Ｂは磁束検出用巻線２７
の誘起電圧v2を積分器２９で積分すると共に、そ
の巻線２７の巻回数N2と該鉄心の有効断面積Ａ
〔cm2〕より、
Ｂ＝１／AN2∫v2dt
の演算を行つて求める。そして、このような損失
と磁束密度を鉄損表示器３０に入力し、第８図お
よび第９図に示す特性を得る。ここで、第８図は
磁束密度Ｂをパラメータとして、横軸に周波数
を、縦軸に鉄損（Ｗ／Kg）をとつたもので、その
特性は両対数目盛のグラフ上でほぼ直線で近似さ
れる。第９図は周波数ｆをパラメータとして、横
軸に鉄損（Ｗ／Kg）を、縦軸に磁束密度Ｂ〔Ｇ〕
をとり、その関係をあらわしており、両対数グラ
フ上ではほぼ直線で近似できる。 First, the power supply 2 is connected to the primary winding 26 of the transformer 25 under test.
2, a sinusoidal voltage is applied to cause an exciting current to flow through the primary winding 26, and this current is measured by a current detector 24. Further, the applied voltage is measured by a voltage detector 23, and the electric power is obtained by multiplying this voltage and the instantaneous value of the current by a multiplier 28, respectively. This power value indicates iron loss, which is divided by the core weight of the test transformer 25 and expressed as loss per unit weight (generally 1 kg). The magnetic flux density B is the magnetic flux detection winding 27
The induced voltage v 2 is integrated by the integrator 29, and the number of turns N 2 of the winding 27 and the effective cross-sectional area A of the core are
From [cm 2 ], calculate B=1/AN 2 ∫v 2 dt. Then, such loss and magnetic flux density are input into the iron loss display 30 to obtain the characteristics shown in FIGS. 8 and 9. Here, Figure 8 shows the magnetic flux density B as a parameter, the frequency on the horizontal axis, and the iron loss (W/Kg) on the vertical axis, and its characteristics are approximated by a straight line on a logarithmic scale graph. be done. Figure 9 shows iron loss (W/Kg) on the horizontal axis and magnetic flux density B [G] on the vertical axis, with frequency f as a parameter.
The relationship is expressed by , and can be approximated by a straight line on a logarithmic graph.
従来の鉄損計測器は以上のように構成されてい
るので、鉄損表示器３０に表示した鉄損特性曲線
は正弦波電圧について鉄損を表示するものであ
り、インバータ装置などの矩形波を扱うものにつ
いては適用できない。また、矩形電圧について実
測し、鉄損値を知ることは、限定された条件にお
いては可能であつても、印加する電源設備が容易
に得られず、従つて矩形波が印加される電圧変圧
器の鉄損を実測又は設計段階で推定することは極
めて困難であつた。
Since the conventional iron loss measuring instrument is configured as described above, the iron loss characteristic curve displayed on the iron loss display 30 displays the iron loss for a sine wave voltage, and is used for rectangular waves such as inverter equipment. It cannot be applied to items handled. In addition, although it is possible to actually measure the rectangular voltage and find out the iron loss value under limited conditions, power supply equipment for applying it is not easily available, and therefore it is difficult to obtain the power supply equipment for voltage transformers to which a rectangular wave is applied. It was extremely difficult to measure or estimate the iron loss at the design stage.
この発明は上記のような問題点を解消するため
になされたもので、任意の矩形波の任意の周波数
を有する電圧が印加された場合でも、鉄損値を略
正確に実測または推定できる鉄損計測器を得るこ
とを目的とする。 This invention was made in order to solve the above-mentioned problems, and even when a voltage having an arbitrary frequency of an arbitrary rectangular wave is applied, the iron loss value can be actually measured or estimated almost accurately. The purpose is to obtain measuring instruments.
この発明にかかる鉄損計測器は、矩形波電圧の
印加によつて半周期に得られる磁束密度の変化量
を変化量出力手段によつて検出出力し、上記磁束
密度の時間変化率を時間変化率出力手段によつて
出力し、上記磁束密度の変化量および磁束密度の
時間変化率を入力として、鉄損変換器により半周
期または１周期当りの鉄損値を単位重量当りのジ
ユール損失として出力するように構成したもので
ある。
The iron loss measuring instrument according to the present invention detects and outputs the amount of change in the magnetic flux density obtained in a half cycle by applying a rectangular wave voltage using a change amount output means, and detects and outputs the time rate of change of the magnetic flux density over time. Using the above-mentioned change amount of magnetic flux density and time change rate of magnetic flux density as input, the iron loss converter outputs the iron loss value per half cycle or one cycle as Joule loss per unit weight. It is configured to do so.
この発明における鉄損変速器は、磁束密度の変
化量△Ｂをパラメータとして、磁束密度の時間変
化率dB／dtおよび鉄心の単位重量当りのジユール
損失を座標軸上に設定した鉄損特性を有し、この
鉄損特性に従つて、矩形波電圧の印加によつて得
られる上記磁束密度の時間変化率dB／dtおよび磁
束密度の変化量△Ｂから、半周期または１周期の
鉄損値を求めることができるようにしており、従
つて、これに時間を乗算すれば、その時間単位で
の鉄損も容易に求められる。
The iron loss transmission according to the present invention has an iron loss characteristic in which the time change rate d B /dt of the magnetic flux density and the Joule loss per unit weight of the iron core are set on the coordinate axis, with the amount of change ΔB in the magnetic flux density as a parameter. According to this iron loss characteristic, the iron loss value for a half cycle or one cycle can be calculated from the time rate of change d B /dt of the magnetic flux density and the amount of change ΔB of the magnetic flux density obtained by applying a rectangular wave voltage. Therefore, by multiplying this by time, the iron loss in that time unit can be easily determined.
以下、この発明の一実施例を図について説明す
る。
An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１は矩形波電圧の電源、２は
供試変圧器３の１次巻線、４は同じく２次巻線、
５は積分器、６は時間幅カウンタ、７はカウンタ
出力、８は磁束密度の時間変化率出力手段として
の除算器、９は磁束密度出力、１０は磁束密度時
間変化率出力、１１は磁束密度の変化量出力手段
１１ａを有する鉄損変換器であり、この鉄損変換
器１１は磁束密度の変化量および磁束密度の時間
的変化率を入力し、あらかじめ鉄心材料に応じて
定められ且つ磁束密度の変化量および磁束密度の
時間的変化率に対応する鉄損値の関係式に基づい
て半周期間あたりの鉄損値を単位重量あたのジユ
ール損失として出力する。１２は鉄損値出力、１
３は鉄損計測器である。なお、ここで変化量出力
手段は鉄損変換器１１の外部に出すこともでき
る。 In Fig. 1, 1 is a square wave voltage power source, 2 is the primary winding of the transformer under test 3, 4 is the secondary winding,
5 is an integrator, 6 is a time width counter, 7 is a counter output, 8 is a divider as a means for outputting the time change rate of magnetic flux density, 9 is a magnetic flux density output, 10 is a magnetic flux density time change rate output, 11 is magnetic flux density This iron loss converter 11 has a change amount output means 11a, and this iron loss converter 11 inputs the change amount of magnetic flux density and the time rate of change of magnetic flux density, and inputs the change amount of magnetic flux density and the time rate of change of magnetic flux density. The iron loss value per half cycle period is output as the Joule loss per unit weight based on the relational expression of the iron loss value corresponding to the amount of change in and the temporal rate of change of the magnetic flux density. 12 is iron loss value output, 1
3 is an iron loss measuring device. Note that here, the variation output means can also be provided outside the iron loss converter 11.
次に動作について具体的に説明する。まず、供
試変圧器３の１次巻線２に矩形波電圧を印加し、
その電圧に比例した電圧ｖを２次巻線４に得て、
これを鉄損計測器１３へ入力する。入力された電
圧ｖは積分器５に入力され、その出力は磁束密度
Ｂとして鉄損変換器１１に入力される。また、上
記電圧ｖは矩形波の時間幅を測定するためのカウ
ンタ６にも入力され、このカウンタ６の出力であ
る矩形波の半周期の時間幅Ｔを除算器８に入力す
る。除算器８では、磁束密度を時間で除した値
dB／dt（磁束密度の時間変化率）を出力し、この
時間変化率出力dB／dtと磁束出力９にもとづく磁
束密度Ｂの変化量△Ｂとを鉄損変換器１１におい
て演算を行い、鉄損値を出力するものである。次
に、以上のべた鉄損計測の原理を説明する。 Next, the operation will be specifically explained. First, a square wave voltage is applied to the primary winding 2 of the transformer under test 3,
A voltage v proportional to that voltage is obtained in the secondary winding 4,
This is input to the iron loss measuring device 13. The input voltage v is input to the integrator 5, and its output is input as the magnetic flux density B to the iron loss converter 11. The voltage v is also input to a counter 6 for measuring the time width of the rectangular wave, and the output of this counter 6, the time width T of a half cycle of the rectangular wave, is input to the divider 8. Divider 8 calculates the value obtained by dividing the magnetic flux density by time.
d B /dt (time rate of change in magnetic flux density) is output, and the iron loss converter 11 calculates this time change rate output d B /dt and the amount of change ΔB in magnetic flux density B based on the magnetic flux output 9. , which outputs the iron loss value. Next, the principle of the above solid iron loss measurement will be explained.
第２図は矩形波電圧Ｅを印加した時に流れる励
磁電流ｉ及び磁束密度Ｂの各波形を示す。半サイ
クルの期間T1における磁束密度Ｂの変化は△Ｂ
であるので、その時間変化率dB／dtは、dB／dt＝
△B／T1となる。この時の損失は矩形波電圧Ｅと
励磁電流ｉの瞬時値の乗算で求まる。損失は半サ
イクルなのでジユールであり、これを鉄心重量で
除すと、鉄損の単位は〔ジユール／Kg〕となる。
そこで、任意の△Ｂ及びT1について種々のデー
タを測定すると、第３図に表示される曲線を得る
ことができる。第３図は磁束変化値△Ｂをパラメ
ータとし、上記説明したdB／dtを横軸に、半周期
あたりの鉄損〔ジユール／Kg〕を縦軸に表わした
ものである。いずれの軸も対数目盛を使用してお
り、実測の結果、ほぼ直線で表わされる。また、
図上の△B1，△B2，△B3など変化する磁束値に
対して、これらの曲線（両対数目盛グラフ上では
直線である）の大きさ（鉄損値）と曲線の傾きに
は一定の法則が有り、これらの関係を数式化でき
ることが発明者により確認されている。例えば、
入力変数を△Ｂ・dB／dtとすれば、損失Ｐは
Ｐ＝K1・△Bm・（dB／dt）n
となる。ここで、ｎは、ｎ＝K2・（△Ｂ）rであ
り、K1、K2、ｍ、ｒは磁性材料によつて決まる
定数で、例えば、△Ｂをガウス〔Ｇ〕、dB／dtを
〔ガウス(G)／μs〕で表わした珪素鋼帯G10級0.3tの
場合には、
K1＝1.943×10-5、K2＝1.205、ｍ＝1.08、ｒ＝−
0.049
で与えられ、このような演算を鉄損変換器１１で
行い、鉄損Ｐを出力する。 FIG. 2 shows the waveforms of the excitation current i and magnetic flux density B flowing when the rectangular wave voltage E is applied. The change in magnetic flux density B during half cycle period T1 is △B
Therefore, the time rate of change d B /dt is d B /dt=
△ B /T 1 . The loss at this time is determined by multiplying the rectangular wave voltage E and the instantaneous value of the excitation current i. The loss is in joules because it is a half cycle, and when this is divided by the weight of the core, the unit of iron loss is [joules/Kg].
Therefore, by measuring various data for arbitrary ΔB and T 1 , the curve shown in FIG. 3 can be obtained. In FIG. 3, the magnetic flux change value ΔB is used as a parameter, the above-described d B /dt is plotted on the horizontal axis, and the iron loss per half cycle [Joule/Kg] is plotted on the vertical axis. Both axes use a logarithmic scale, and as a result of actual measurements, they are expressed almost as a straight line. Also,
For changing magnetic flux values such as △B 1 , △B 2 , △B 3 in the figure, the magnitude (iron loss value) of these curves (which are straight lines on the logarithmic scale graph) and the slope of the curves The inventor has confirmed that there are certain laws and that these relationships can be expressed mathematically. for example,
If the input variable is △B・d B /dt, then the loss P becomes P=K 1・△B m・(d B /dt) n . Here, n is n=K 2 · (△B) r , and K 1 , K 2 , m, and r are constants determined by the magnetic material. For example, △B is Gauss [G], d B /dt expressed in [Gauss (G)/μs] in the case of silicon steel strip G 10 class 0.3t, K 1 = 1.943×10 -5 , K 2 = 1.205, m = 1.08, r = -
0.049, such calculation is performed by the iron loss converter 11, and the iron loss P is output.
第４図は本発明の他の実施例で、第１図がカウ
ンタ６の出力により時間幅Ｔを計測していたもの
に対し、あらかじめ時間幅Ｔを外部入力１４によ
り設定しておくものである。一般に、印加される
矩形波の時間幅は計算で求め得るものである。従
つて、この実施例では検出した電圧ｖを積分器５
へ入力するのみで良く、回路構成が非常に簡単に
なる特徴がある。 FIG. 4 shows another embodiment of the present invention, in which the time width T is set in advance by an external input 14, whereas in FIG. 1 the time width T is measured by the output of the counter 6. . Generally, the time width of the applied rectangular wave can be determined by calculation. Therefore, in this embodiment, the detected voltage v is applied to the integrator 5.
It has the feature that the circuit configuration is very simple, as it only needs to be input to the .
以上の考え方を基本にして、第５図のような休
止期間付矩形波電圧が印加される場合の鉄損を演
算することもできる。第５図は１サイクルの内、
矩形波電圧E1が時間T1の期間印加され、励磁電
流i1が流れた図を示す。この期間T1で磁束密度Ｂ
が△B1の値だけ変化するとすれば、磁束変化率
dB／dtはdB／dt＝△B1／T1となる。この値△
B1／T1と磁束変化値△B1の値より第３図のグラ
フを使用して鉄損を求めることができる。 Based on the above concept, it is also possible to calculate the iron loss when a rectangular wave voltage with a rest period as shown in FIG. 5 is applied. Figure 5 shows that within one cycle,
A diagram in which a rectangular wave voltage E 1 is applied for a period of time T 1 and an excitation current i 1 flows is shown. During this period T 1 , the magnetic flux density B
If changes by the value of △B 1 , the magnetic flux change rate
d B /dt becomes d B /dt=△B 1 /T 1 . This value△
The iron loss can be determined from the values of B 1 /T 1 and the magnetic flux change value ΔB 1 using the graph in FIG.
第６図は上記の方法により鉄損P1〔Ｊ／Kg〕を
求める経路を示した図である。上記により求めら
れた値P1は、半サイクルにおける損失を表わす
ため、これを２倍して１サイクルの損失を算出
し、さらに周波数を乗ずれば、１秒間当りの損失
をジユール即ちワツト〔Ｗ〕で算出できる。 FIG. 6 is a diagram showing a route for determining iron loss P 1 [J/Kg] using the above method. The value P1 obtained above represents the loss in a half cycle, so by doubling it to calculate the loss in one cycle and further multiplying by the frequency, the loss per second can be calculated in units of joules or watts. ] can be calculated.
矩形波電圧の印加による鉄損データは、従来に
おいては十分に把握されておらず、特に、任意の
休止期間がある矩形波電圧や周波数が種々に変化
する矩形波電圧では、そのつど、鉄損データを実
験により求めるより外に方法がなかつた。この発
明では、上記休止期間や周波数変化がある矩形波
電圧であつても、dB／dtおよび△Ｂについて１パ
ルス当りの損失を求め、これをグラフ化または数
式化して記憶した鉄損変換器１１を作ることによ
つて、任意の△Ｂ、dB／dtについての鉄損を容易
に計測することができる。 Iron loss data due to the application of a rectangular wave voltage has not been sufficiently understood in the past, and in particular, with a rectangular wave voltage that has an arbitrary rest period or a rectangular wave voltage that varies in frequency, the iron loss data is There was no other way but to obtain the data through experiments. In this invention, even if the voltage is a rectangular wave with the above-mentioned rest periods and frequency changes, the loss per pulse is determined for d B /dt and ΔB, and the iron loss converter stores the loss as a graph or a mathematical expression. 11, the iron loss for any ΔB and d B /dt can be easily measured.
以上のように、この発明によれば、鉄損計測器
を磁束密度の変化量および磁束密度の時間変化率
を入力として、半周期または１周期当りの鉄損値
を単位重量当りのジユール損失として出力するよ
うに構成したので、入力される矩形波電圧の周波
数が変化するものであつたり、休止期間のある矩
形波電圧であつても、必要期間の鉄損値を容易に
測定することができ、その測定精度は十分に高い
ものが得られる効果がある。
As described above, according to the present invention, the amount of change in magnetic flux density and the time rate of change in magnetic flux density are input to the iron loss measuring instrument, and the iron loss value per half cycle or one cycle is expressed as the Joule loss per unit weight. Since it is configured to output, the iron loss value for the required period can be easily measured even if the frequency of the input rectangular wave voltage changes or the rectangular wave voltage has a rest period. This has the effect of obtaining sufficiently high measurement accuracy.
第１図はこの発明の一実施例による鉄損計測器
の回路図、第２図は動作原理を説明する電圧、電
流および磁束密度の波形図、第３図はこの発明に
おける鉄損特性図、第４図は他の実施例による鉄
損計測器の回路図、第５図は休止期間のある電
圧、電流および磁束密度の波形図、第６図は第５
図において鉄損を求める方法を示す鉄損特性図、
第７図は従来の鉄損計測器の回路図、第８図およ
び第９図は従来の鉄損特性図である。
１は矩形波電圧の電源、３は供試変圧器、５は
積分器、６はカウンタ、８は時間変化率出力手
段、１１は磁束密度の変換量出力手段を有する鉄
損変換器。
FIG. 1 is a circuit diagram of an iron loss measuring instrument according to an embodiment of the present invention, FIG. 2 is a waveform diagram of voltage, current and magnetic flux density to explain the operating principle, and FIG. 3 is an iron loss characteristic diagram in this invention. FIG. 4 is a circuit diagram of an iron loss measuring instrument according to another embodiment, FIG. 5 is a waveform diagram of voltage, current, and magnetic flux density with a rest period, and FIG.
Iron loss characteristic diagram showing how to determine iron loss in the figure,
FIG. 7 is a circuit diagram of a conventional iron loss measuring instrument, and FIGS. 8 and 9 are conventional iron loss characteristic diagrams. 1 is a rectangular wave voltage power source, 3 is a transformer under test, 5 is an integrator, 6 is a counter, 8 is a time rate of change output means, and 11 is an iron loss converter having a magnetic flux density conversion amount output means.
Claims (1)
電圧の半周期間における立ち上がり時点から立ち
下がり時点までの磁束密度の変化量を出力する変
化量出力手段と、上記半周期間における磁束密度
の時間的変化率を出力する時間変化率出力手段
と、上記磁束密度の変化量および磁束密度の時間
的変化率を入力し、あらかじめ鉄心材料に応じて
定められ且つ磁束密度の変化量および磁束密度の
時間的変化率に対応する鉄損値の関係式に基づい
て半周期間あたりの鉄損値を単位重量あたりのジ
ユール損失として出力する鉄損変換器とを備えた
鉄損計測器。 ２ 時間変化率出力手段は矩形波電圧を積分して
得られた磁束密度および上記矩形波電圧の立ち上
がり時点から立ち下がり時点までの期間に基づい
て磁束密度の時間的変化率を求めることを特徴と
する特許請求の範囲第１項記載の鉄損計測器。 ３ 矩形波電圧の立ち上がり時点から立ち下がり
時点までの期間が外部入力によつて設定されるこ
とを特徴とする特許請求の範囲第１項記載の鉄損
計測器。[Scope of Claims] 1. A change amount output means for outputting the amount of change in magnetic flux density obtained by applying a rectangular wave voltage from a rising point to a falling point in a half cycle period of the rectangular wave voltage, and the above half cycle period. a time change rate output means for outputting the time change rate of the magnetic flux density at , and inputting the change amount of the magnetic flux density and the time change rate of the magnetic flux density, and inputting the change amount of the magnetic flux density and the time change rate of the magnetic flux density, and the change amount of the magnetic flux density determined in advance according to the iron core material. and an iron loss converter that outputs an iron loss value per half-cycle period as a Joule loss per unit weight based on a relational expression of an iron loss value corresponding to a temporal rate of change in magnetic flux density. 2. The time rate of change output means is characterized in that the time rate of change in the magnetic flux density is determined based on the magnetic flux density obtained by integrating the rectangular wave voltage and the period from the rise point to the fall point of the rectangular wave voltage. An iron loss measuring instrument according to claim 1. 3. The iron loss measuring instrument according to claim 1, wherein the period from the rise time to the fall time of the rectangular wave voltage is set by an external input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12554386A JPS62282281A (en) | 1986-05-30 | 1986-05-30 | Iron loss measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12554386A JPS62282281A (en) | 1986-05-30 | 1986-05-30 | Iron loss measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62282281A JPS62282281A (en) | 1987-12-08 |
| JPH0533753B2 true JPH0533753B2 (en) | 1993-05-20 |
Family
ID=14912796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12554386A Granted JPS62282281A (en) | 1986-05-30 | 1986-05-30 | Iron loss measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62282281A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100231887B1 (en) * | 1997-02-20 | 1999-12-01 | 윤문수 | A testing system for high-frequency magnetic characteristics |
| JP7252466B2 (en) * | 2018-12-12 | 2023-04-05 | 日本製鉄株式会社 | Iron loss measurement method and iron loss measurement system |
-
1986
- 1986-05-30 JP JP12554386A patent/JPS62282281A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62282281A (en) | 1987-12-08 |
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