JP4554346B2 - Magnetizer - Google Patents

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JP4554346B2
JP4554346B2 JP2004365862A JP2004365862A JP4554346B2 JP 4554346 B2 JP4554346 B2 JP 4554346B2 JP 2004365862 A JP2004365862 A JP 2004365862A JP 2004365862 A JP2004365862 A JP 2004365862A JP 4554346 B2 JP4554346 B2 JP 4554346B2
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JP2006173447A5 (en
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充孝 堀
有仁 笠原
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日本電磁測器株式会社
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Description

本発明は、整流回路により充電される充電コンデンサに、着磁用スイッチング素子及び着磁コイルで構成される直列回路が並列に接続され、着磁用スイッチング素子のオン制御に応答して充電コンデンサの充電電圧により着磁コイルに供給される着磁電流により着磁磁界を発生するようになった着磁器に関するものである。   In the present invention, a series circuit composed of a magnetizing switching element and a magnetizing coil is connected in parallel to a charging capacitor charged by a rectifier circuit, and the charging capacitor is connected in response to on-control of the magnetizing switching element. The present invention relates to a magnetizer that generates a magnetizing magnetic field by a magnetizing current supplied to a magnetizing coil by a charging voltage.

図3は、この種の従来の典型的な回路を示すもので、商用電源電圧の位相を制御する位相制御回路1と、これにより入力電力を調整された昇圧トランス3の昇圧電圧を整流する整流回路2と、その整流出力電圧で充電される充電コンデンサC1と、この充電コンデンサに並列に接続され、かつ着磁用スイッチング素子であるSCR1及び着磁コイルL1による直列回路で構成される。これにより、SCR1を点弧パルスで導通させて着磁コイルL1に着磁電流を供給し、充電コンデンサC1の充電電圧が略ゼロになる時点から着磁コイルL1に発生する逆起電力でフライホイールダイオードD1に循環電流を流している。   FIG. 3 shows a conventional typical circuit of this type. The phase control circuit 1 controls the phase of the commercial power supply voltage, and the rectification that rectifies the boosted voltage of the booster transformer 3 whose input power is adjusted thereby. The circuit 2 is constituted by a series circuit including a charging capacitor C1 charged with the rectified output voltage, a SCR1 which is a switching element for magnetization connected in parallel to the charging capacitor, and a magnetizing coil L1. As a result, the SCR 1 is turned on by an ignition pulse to supply a magnetizing current to the magnetizing coil L1, and the flywheel is driven by the back electromotive force generated in the magnetizing coil L1 when the charging voltage of the charging capacitor C1 becomes substantially zero. A circulating current is passed through the diode D1.

一方、特許文献1により、直流電源と直列に接続されたオン/オフが可能なスイッチング手段と、直流電源と並列に接続され、スイッチング手段が非導通状態になると直流電源より電荷を充電される一方、スイッチング手段が導通状態になると負荷である着磁用コイルに対して充電された電荷を放電して励磁電流を流す充放電手段と、励磁電流がピーク値に至った後にスイッチング手段をオフ制御し、着磁用コイルへの通電を遮断する電流遮断制御手段と、通電遮断時に発生する逆起電力を充放電手段に回生する回生回路を備えた着磁装置が、周知である。
特開2001−332423号公報
On the other hand, according to Patent Document 1, switching means connected in series with a DC power supply and capable of turning on / off are connected in parallel with the DC power supply, and when the switching means becomes non-conductive, the electric charge is charged from the DC power supply. When the switching means becomes conductive, the charging / discharging means for discharging the charge charged to the magnetizing coil as a load and causing the excitation current to flow, and the switching means is controlled to be off after the excitation current reaches the peak value. A magnetizing apparatus having a current interruption control means for interrupting energization to a magnetizing coil and a regenerative circuit for regenerating back electromotive force generated when the energization is interrupted to charging / discharging means is well known.
JP 2001-332423 A

この特許文献1による着磁装置によれば、フライホイールダイオードの循環電流によりコイルを無駄に発熱させるのを回避して、逆起電力のエネルギ分を回生可能にしているが、着磁電流の通電途中でオフ制御する必要があるために、保持電流を下廻ると消弧する通常のSCRに代えて、オフ制御可能なスイッチング素子を用いる必要がある。したがって、現状では着磁電流が十kAオーダの大電流になると、IGBT等のオンオフ制御可能なスイッチング素子を並列に多数接続し、さらに耐圧的にもスイッチング素子の保護回路が必要になる。   According to the magnetizing apparatus according to Patent Document 1, it is possible to regenerate the energy of the back electromotive force by avoiding unnecessary heating of the coil due to the circulating current of the flywheel diode. Since it is necessary to perform off control in the middle, it is necessary to use a switching element that can be turned off instead of a normal SCR that extinguishes when the holding current falls below. Therefore, at present, when the magnetizing current becomes a large current on the order of 10 kA, a large number of switching elements such as IGBTs that can be controlled to be turned on / off are connected in parallel, and a protection circuit for the switching elements is also required in terms of breakdown voltage.

本発明は、このような点に鑑みて、整流出力電圧で充電される充電コンデンサの充電電圧により、着磁用スイッチング素子のオン制御で着磁コイルに着磁電流を供給するようになった冒頭に述べた類の着磁器において、着磁電流をそのピーク値の近辺で遮断することなく、着磁用コイル及び充電コンデンサに共振電流の最初の半波を着磁電流とし、残留エネルギを回生できる着磁器を提供することを目的とする。   In view of the above, the present invention provides a magnetizing current supplied to a magnetizing coil by on-control of a magnetizing switching element by a charging voltage of a charging capacitor charged with a rectified output voltage. In the magnetizer of the kind described above, the residual energy can be regenerated by using the first half wave of the resonance current as the magnetizing current in the magnetizing coil and the charging capacitor without interrupting the magnetizing current in the vicinity of the peak value. An object is to provide a magnetizer.

本発明は、この目的を達成するために、請求項1により、商用電源電圧を入力とする整流回路の整流出力電圧により充電される充電コンデンサに、着磁用SCR及び着磁コイルで構成される直列回路が並列に接続され、着磁用SCRのオン制御に応答して充電コンデンサの充電電圧で着磁コイルに着磁電流を供給することにより周期的に着磁磁界を発生するようになった着磁器において、整流回路及充電コンデンサ間に充電用SCRを介在させると共に、充電コンデンサに、回生用コイル及び回生用SCRで構成される回生用直列回路を並列に接続し、それぞれスイッチング素子としての充電用SCR、着磁用SCR及び回生用SCRに、これらのSCRをオン制御するスイッチング制御回路を付属させることにより、充電用SCRのオン制御により整流出力電圧で充電コンデンサを充電させ、次いでその充電終了後の充電用SCRの非導通状態で着磁用SCRをオン制御し、続いてこのオン制御時点から着磁コイルと充電コンデンサCとによる着磁用共振電流の半周期の経過後の着磁用SCRの非導通状態で回生用SCRをオン制御することにより、半周期中の前記着磁コイルにより充電コンデンサに充電されている逆電圧を回生用コイルと充電コンデンサとによる回生用共振電流によりその半周期中に正電圧として充電コンデンサに回生させて回生用SCRを非導通状態にすることを特徴とする。 In order to achieve this object, the present invention comprises, according to claim 1, a charging capacitor charged with a rectified output voltage of a rectifier circuit that receives a commercial power supply voltage as an SCR for magnetization and a magnetizing coil. A series circuit is connected in parallel, and a magnetizing magnetic field is generated periodically by supplying a magnetizing current to the magnetizing coil with the charging voltage of the charging capacitor in response to the on-control of the magnetizing SCR . In a magnetizer, a charging SCR is interposed between a rectifier circuit and a charging capacitor, and a regenerative series circuit composed of a regenerative coil and a regenerative SCR is connected in parallel to the charging capacitor, and charging is performed as a switching element. use SCR, the magnetizing SCR and regenerating SCR, by suppliers of the switching control circuit that turns on control these in SCR, on system of the charging SCR To charge the charging capacitor by the rectifier output voltage by, then on control the magnetizing SCR nonconductive state of charging SCR after the completion of charging, followed by this on the control point to the magnetizing coil and the charging capacitor C By turning on the regenerative SCR in the non-conducting state of the magnetizing SCR after the half cycle of the magnetizing resonance current, the reverse voltage charged in the charging capacitor by the magnetizing coil during the half cycle is reduced. The regenerative SCR is brought into a non-conductive state by causing the regenerative resonance current generated by the regenerative coil and the charging capacitor to regenerate to the charging capacitor as a positive voltage during the half cycle .

充電用SCR、着磁用SCR及び回生用SCRは、周知のようにそれぞれオン制御で導通し、その導通電流が保持電流を下廻ると自動的に非導通状態になるスイッチング素子である。充電用SCRのオン制御により整流出力電圧で充電コンデンサを充電し、その充電後の充電用SCRの非導通状態で、着磁用SCRをオン制御して充電コンデンサの充電電圧により着磁コイルと充電コンデンサとによる着磁用共振電流を着磁コイルに供給する。この共振電流の半周期の経過後の着磁用SCRの非導通状態で、回生用SCRをオン制御して、着磁中に着磁コイルにより充電コンデンサに充電され、かつ着磁時の電圧極性に対する逆電圧を回生用コイルと充電コンデンサとによる回生用共振電流により、再反転して正電圧として充電コンデンサに回生する。この回生用共振電流の半周期の経過後に回生用SCRは非導通状態になる。 As is well known, the charging SCR, the magnetizing SCR, and the regenerative SCR are each a switching element that is turned on by ON control, and is automatically turned off when the conduction current falls below the holding current. The charging capacitor is charged with the rectified output voltage by the on-control of the charging SCR , and the magnetization SCR is turned on by the charging SCR in the non-conducting state after charging, and the magnetizing coil is charged by the charging voltage of the charging capacitor. A resonance current for magnetization by the capacitor is supplied to the magnetizing coil. The regenerative SCR is turned on in the non-conducting state of the magnetizing SCR after the half period of this resonance current has elapsed , and the charging capacitor is charged by the magnetizing coil during the magnetizing, and the voltage polarity at the time of magnetizing The reverse voltage is re-inverted by the regenerative resonance current generated by the regenerative coil and the charging capacitor and regenerated as a positive voltage to the charging capacitor. The regenerative SCR becomes non-conductive after a half cycle of the regenerative resonance current.

請求項1の発明によれば、充電用、着磁用及び回生用スイッチング素子にSCRを採用し、着磁電流を着磁コイルと充電コンデンサとによる共振電流とすると共に、その半周期の経過時点で、着磁コイルにより充電コンデンサに充電されている逆電圧を回生用コイルと充電コンデンサとによる共振電流により反転して充電コンデンサに回生することにより、フライホイールダイオードを介して循環させていた電流を、オンオフ双方の制御パルスで制御する特殊なスイッチング素子を用いることなく、商用電源の整流出力である大電流の着磁電流を前提にしても簡単な回路構成で回生可能になり、省電力化が実現される。また、着磁電流が、ピーク電流から低減する共振周波数の半周期にわたり供給されることにより、ピーク電流に達した時点で遮断する方式に比べて、急激な電流変化に起因する渦電流の発生も抑制できる。その際、請求項2の発明により、整流出力電圧が商用電源に対応した整脈波状であっても充電用SCRを着磁直前までオン制御することにより、充電コンデンサの充電電圧の放電を補充しつつ着磁時には脈波状整流出力電圧で容易にオフ制御される。 According to the first aspect of the present invention, the SCR is adopted for the charging, magnetization, and regenerative switching elements, and the magnetization current is set as the resonance current by the magnetization coil and the charging capacitor, and the half-cycle has elapsed. Thus, the reverse voltage charged to the charging capacitor by the magnetizing coil is reversed by the resonance current generated by the regenerative coil and the charging capacitor and regenerated to the charging capacitor, so that the current circulated through the flywheel diode can be obtained. Without using a special switching element that is controlled by both ON and OFF control pulses, it is possible to regenerate with a simple circuit configuration even on the premise of a large magnetizing current that is a rectified output of a commercial power supply , thus saving power. Realized. In addition, since the magnetizing current is supplied over a half cycle of the resonance frequency that is reduced from the peak current, eddy currents are also generated due to a sudden current change compared to the method of cutting off when the peak current is reached. Can be suppressed. In this case, according to the second aspect of the invention, even when the rectified output voltage is in the form of a rhythmic wave corresponding to the commercial power supply, the charging SCR is turned on until just before magnetization, thereby supplementing the discharge of the charging voltage of the charging capacitor. While being magnetized, it is easily turned off by the pulse wave rectified output voltage.

図1及び図2により本発明の実施の形態による着磁器を説明する。この着磁器は、図3を基に既述したように、着磁電流量に応じて昇圧トランス3の入力電力を調整するために商用電源の電圧を位相制御する位相制御回路1と、昇圧トランス3の交流出力電圧を整流する整流回路2と、その脈波状の整流出力電圧で充電される充電コンデンサC1と、この充電コンデンサに並列に接続され、かつ着磁用スイッチング素子であるSCR1及び着磁コイルL1で構成される直列回路とを備えると共に、整流回路2及び充電コンデンサC1間に充電用スイッチング素子であるSCR3が接続され、その出力側のカソード側において、充電コンデンサC1に、回生用コイルL2及び回生用スイッチング素子であるSCR2で構成される回生用直列回路が並列に接続されている。SCR1〜3には、これらのスイッチング素子を所定のタイミングで点弧させるオン制御パルスとしての点弧パルスを出力するスイッチング制御回路5が付属している。   A magnetizer according to an embodiment of the present invention will be described with reference to FIGS. As described above with reference to FIG. 3, the magnetizer includes a phase control circuit 1 that controls the phase of the voltage of the commercial power source in order to adjust the input power of the step-up transformer 3 in accordance with the amount of magnetizing current, and the step-up transformer 3. Rectifying circuit 2 for rectifying the AC output voltage of the power supply, charging capacitor C1 charged with the pulsed rectified output voltage, SCR1 which is connected in parallel with the charging capacitor and is a switching element for magnetization, and a magnetizing coil SCR3, which is a charging switching element, is connected between the rectifier circuit 2 and the charging capacitor C1, and the regenerative coil L2 and the regenerative coil L2 are connected to the charging capacitor C1 on the cathode side on the output side thereof. A series circuit for regeneration composed of SCR2 which is a switching element for regeneration is connected in parallel. Each of the SCRs 1 to 3 is provided with a switching control circuit 5 that outputs an ignition pulse as an ON control pulse for igniting these switching elements at a predetermined timing.

この着磁器は、例えば周期的に例えば10kA程度の着磁電流パルスを着磁コイルL1に供給して、このコイル内に順に搬送されてくる磁石に着磁する。また、回生用コイルL2のインダクタンスは、充電コンデンサC1との共振周波数の周期により、着磁周期を大幅に長くせず、かつ構造的に嵩張らないように、着磁コイルL1のインダクタンスよりも小さく設定されている。   For example, the magnetizer periodically supplies a magnetizing current pulse of, for example, about 10 kA to the magnetizing coil L1, and magnetizes the magnets sequentially conveyed into the coil. Further, the inductance of the regenerative coil L2 is set smaller than the inductance of the magnetizing coil L1 so that the magnetizing period is not significantly lengthened and structurally bulky due to the period of the resonance frequency with the charging capacitor C1. Has been.

このように構成された着磁器の動作を図2を参照して説明する。着磁用SCR1が点弧パルスP1でオン制御されることにより、着磁コイルL1には、図3につき前述したように、商用電源電圧に対する位相制御パルスP4で入力電力を調整された整流回路2の整流出力電圧により充電された充電コンデンサC1の充電電圧により着磁電流が供給される。この着磁電流は、着磁コイルL1と充電コンデンサC1との共振電流として供給され、その共振周波数の着磁電流が略ゼロになる半周期T1を経過する時点でSCR1は消弧する。商用電源電圧の位相を制御する位相制御回路1と、これにより入力電力を調整された昇圧トランス3の昇圧電圧を整流する The operation of the magnetizer constructed as described above will be described with reference to FIG. As the magnetizing SCR 1 is turned on by the ignition pulse P1, the rectifying circuit 2 in which the input power is adjusted by the phase control pulse P4 with respect to the commercial power supply voltage is applied to the magnetizing coil L1 as described above with reference to FIG. The magnetizing current is supplied by the charging voltage of the charging capacitor C1 charged by the rectified output voltage. This magnetizing current is supplied as a resonance current between the magnetizing coil L1 and the charging capacitor C1, and the SCR 1 is extinguished when a half period T1 at which the magnetizing current at the resonance frequency becomes substantially zero has elapsed. The phase control circuit 1 that controls the phase of the commercial power supply voltage and the boosted voltage of the booster transformer 3 whose input power is adjusted thereby are rectified.

この間、充電コンデンサC1の充電電圧は徐々に放電し、ピーク電流に達した時点で着磁コイルL1に発生する逆電圧で充電される。即ち、放電開始時の正の充電電圧が、着磁コイルL1等の電力損失による減衰を伴って逆電圧として充電コンデンサC1に保持される。   During this time, the charging voltage of the charging capacitor C1 is gradually discharged and charged with the reverse voltage generated in the magnetizing coil L1 when the peak current is reached. That is, the positive charging voltage at the start of discharging is held in the charging capacitor C1 as a reverse voltage with attenuation due to power loss of the magnetizing coil L1 and the like.

次いで、回生用SCR2が点弧パルスP2でオン制御されると、充電コンデンサC1には、回生用コイルL2との共振により、所定量の減衰を伴って、その半周期T2の間に正電圧が充電され、したがって着磁電流に対して90°位相の進んだ着磁コイルL1の逆電圧により一旦充電コンデンサC1に充電された逆電圧が、回生用コイルL2により再度反転されて正電圧に回生される。その際、同様に、共振周波数の半周期T2に達して回生電流が略ゼロになる時点で、SCR2は消弧して充電コンデンサC1に回生電圧が保持される。即ち、充電電圧により惹起される共振周波数の減衰振動中、その最初の半波が着磁電流として利用され、残りの振動エネルギは回生される。   Next, when the regenerative SCR 2 is turned on by the ignition pulse P2, the charging capacitor C1 is caused to resonate with the regenerative coil L2, and a positive voltage is applied during the half cycle T2 with a predetermined amount of attenuation. The reverse voltage once charged in the charging capacitor C1 by the reverse voltage of the magnetizing coil L1 that is charged and thus advanced in phase by 90 ° with respect to the magnetizing current is inverted again by the regenerative coil L2 and regenerated to the positive voltage. The At that time, similarly, when the half period T2 of the resonance frequency is reached and the regenerative current becomes substantially zero, the SCR 2 is extinguished and the regenerative voltage is held in the charging capacitor C1. That is, during the damped oscillation of the resonance frequency caused by the charging voltage, the first half wave is used as the magnetizing current, and the remaining vibration energy is regenerated.

この状態で、充電用SCR3が着磁用点弧パルスP1の発生直前で終端するゲート幅の点弧パルスP3でオン制御されることにより、充電コンデンサC1は、回生電圧を補充し、さらにその後の放電も補充するように、整流出力電圧で充電期間T3にわたり充電される。次いで、充電期間T3の終端でオン制御パルスP3が消滅することにより、脈波状整流出力電圧の低下時点で充電用SCR3は消弧する。したがって、回生動作中、充電用SCR3は非導通状態であり、また点弧パルスP1により次の着磁が行われる間、補充された電圧は充電コンデンサC1に保持される。   In this state, the charging capacitor C1 is replenished with the regenerative voltage by the charging SCR3 being turned on by the ignition pulse P3 having a gate width that ends immediately before the generation of the magnetizing ignition pulse P1, and then the regenerative voltage is further supplemented. The battery is charged with the rectified output voltage over the charging period T3 so as to supplement the discharge. Next, when the on-control pulse P3 disappears at the end of the charging period T3, the charging SCR 3 is extinguished when the pulse wave rectified output voltage decreases. Therefore, during the regenerative operation, the charging SCR 3 is in a non-conductive state, and the replenished voltage is held in the charging capacitor C1 while the next magnetization is performed by the ignition pulse P1.

尚、前述の実施の形態において、充電用SCR3は、整流出力電圧のリップル成分を少なくすることを前提に、幅の狭いパルスで点弧し、着磁の直前で整流回路の入力を一時的に遮断して消弧させることもできる。   In the above-described embodiment, the charging SCR 3 is ignited with a narrow pulse on the assumption that the ripple component of the rectified output voltage is reduced, and the input of the rectifier circuit is temporarily input immediately before magnetization. It can also be turned off and extinguished.

本発明の実施の形態による着磁器の回路構成を示す図である。It is a figure which shows the circuit structure of the magnetizer by embodiment of this invention. 同装置の動作のタイミング及び動作波形を説明する図である。It is a figure explaining the operation | movement timing and operation | movement waveform of the same apparatus. 従来の着磁器の着磁回路の構成を示す図である。It is a figure which shows the structure of the magnetization circuit of the conventional magnetizer.

符号の説明Explanation of symbols

2 整流回路
C1 充電コンデンサ
L1 着磁コイル
L2 回生用コイル
SCR1 着磁用SCR
SCR2 回生用SCR
SCR3 充電用SCR
2 Rectifier circuit C1 Charging capacitor L1 Magnetizing coil L2 Regenerative coil SCR1 Magnetizing SCR
SCR2 Regenerative SCR
SCR3 SCR for charging

Claims (2)

商用電源電圧を入力とする整流回路の整流出力電圧により充電される充電コンデンサに、着磁用SCR及び着磁コイルで構成される直列回路が並列に接続され、着磁用SCRのオン制御に応答して充電コンデンサの充電電圧で着磁コイルに着磁電流を供給することにより周期的に着磁磁界を発生するようになった着磁器において、
前記整流回路及び前記充電コンデンサ間に充電用SCRを介在させると共に、前記充電コンデンサに、回生用コイル及び回生用SCRで構成される回生用直列回路を並列に接続し、
それぞれスイッチング素子としての前記充電用SCR、前記着磁用SCR及び前記回生用SCRに、これらのSCRをオン制御するスイッチング制御回路を付属させることにより、前記充電用SCRのオン制御により前記整流出力電圧で前記充電コンデンサを充電させ、次いでその充電終了後の前記充電用SCRの非導通状態で前記着磁用SCRをオン制御し、続いてこのオン制御時点から前記着磁コイルと前記充電コンデンサCとによる着磁用共振電流の半周期の経過後の前記着磁用SCRの非導通状態で前記回生用SCRをオン制御することにより、前記半周期中の前記着磁コイルで前記充電コンデンサに充電されている逆電圧を前記回生用コイルと前記充電コンデンサとによる回生用共振電流によりその半周期中に正電圧として前記充電コンデンサに回生させて前記回生用SCRを非導通状態にすることを特徴とする着磁器。
A series circuit composed of a magnetizing SCR and a magnetizing coil is connected in parallel to the charging capacitor charged by the rectified output voltage of the rectifying circuit that receives the commercial power supply voltage, and responds to on-control of the magnetizing SCR. In a magnetizer that generates a magnetizing magnetic field periodically by supplying a magnetizing current to a magnetizing coil with a charging voltage of a charging capacitor,
A charging SCR is interposed between the rectifier circuit and the charging capacitor, and a regenerative series circuit composed of a regenerative coil and a regenerative SCR is connected in parallel to the charging capacitor,
Each of the charging SCR, the magnetizing SCR, and the regenerative SCR as a switching element is provided with a switching control circuit that controls the SCR, so that the rectified output voltage can be controlled by turning on the charging SCR. Then, the charging capacitor is charged, and then the magnetization SCR is turned on in the non-conducting state of the charging SCR after the charging is completed . Subsequently, the magnetizing coil, the charging capacitor C, wherein by turning on controlling the regenerative SCR, said charged in the charging capacitor in the magnetizing coils during a half cycle in magnetizing the non-conductive state of the magnetizing SCR after the elapse of a half period of the resonant current by the regenerative resonance current by a reverse voltage is to said charging capacitor and said regenerative coil during that half cycle the charge and a positive voltage A magnetizer, which comprises the regenerative SCR nonconductive by regenerated to the capacitor.
整流出力電圧が商用電源に対応した整脈波状であり、充電用SCRが、着磁用SCRのオン制御前までオン制御されることを特徴とする請求項1記載の着磁器。 2. The magnetizer according to claim 1, wherein the rectified output voltage has a rhythmic wave shape corresponding to a commercial power source , and the charging SCR is turned on before the magnetizing SCR is turned on.
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JP4512855B2 (en) * 2007-04-16 2010-07-28 日本電磁測器株式会社 Magnetizer
CN101183593B (en) * 2007-10-16 2011-09-28 中山大学 Alternating intense magnetic field instrument
JP6140236B2 (en) * 2015-09-30 2017-05-31 ファナック株式会社 Machine learning device and magnetizing device for electric motor

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JPH0623595A (en) * 1992-07-07 1994-02-01 Nippon Magunesu:Kk Pulse magnet exciting method for magnetic field press machine and its exciting power source device
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