JPH07192918A - Pulse magnetic field generator - Google Patents

Abstract

PURPOSE:To simplify constitution, to reduce cost and to generate a flat top magnetic field in a pulse magnetic field generator generating a pulse magnetic field using a capacitor as a main power supply. CONSTITUTION:In a pulse magnetic field generator generating a pulse magnetic field using a capacitor 11 as a main power supply, a main winding 13 excited by charge energy charged in the capacitor 11, a correction winding 14, which is coupled magnetically with the main winding 13 and mounted, and a pulse power supply 15 reverse exciting the correction winding 14 when a main magnetic field is generated by the excitation of the main winding 13, generating a correction magnetic field and generating a flat magnetic field by the resultant value of the main magnetic field and the correction magnetic field are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse magnetic field generator for generating a pulse magnetic field using a capacitor as a main power source.

[0002]

2. Description of the Related Art Conventionally, researches have been conducted in Japan in which charging energy of a capacitor is applied to a pulse coil to generate a pulse magnetic field based on LC resonance, various physical experiments are carried out in this high magnetic field, and a special beam is generated. It is actively performed outside.

FIG. 7 shows a circuit diagram of such a pulsed magnetic field generator. In FIG. 7, reference numeral 1 denotes a capacitor charged by a power source (not shown), and the capacitor 1 is connected via an injector 2 to a coil 3 for generating a pulsed magnetic field so that a closed loop is formed, and constant current control is performed in the closed loop. A circuit 4 is provided.

Therefore, in such a pulsed magnetic field generator, the energy charged in the capacitor 1 is applied to the injector 2
Is applied to excite the coil 3, a high magnetic field can be obtained.

In this case, it is well known that by appropriately selecting the coil resistance, the coil inductance and the capacitor capacitance, the coil current has a damped oscillation waveform and a sinusoidal pulse magnetic field is obtained as the first half wave. is there.

However, recently, for the purpose of the physical experiment, a constant magnetic field is required as close as possible to the maximum magnetic field. Therefore, as shown in FIG. 4, the constant current control circuit 4 provided in the closed loop circuit controls the current to generate a flat top magnetic field.

[0007]

Generally, the pulse current for generating the pulsed magnetic field is as large as several 10 kA or several 100 kA. Therefore, in the conventional pulsed magnetic field generator, the capacity of the constant current control circuit 4 becomes large, which is disadvantageous in terms of cost.
It is an object of the present invention to solve the above problems and to provide a pulsed magnetic field generator capable of generating a flat top magnetic field with a simple structure and low cost.

[0008]

In order to achieve the above-mentioned object, the present invention comprises a pulsed magnetic field generator by the following means. (1) In a pulse magnetic field generator that generates a pulse magnetic field using a capacitor as a main power source, the main winding excited by the charge energy charged in the capacitor and the main winding are magnetically coupled to each other. A correction winding and a pulse power supply that reversely excites the correction winding when a main magnetic field is generated by excitation of the main winding to generate a correction magnetic field and a flat magnetic field is generated by a combined value thereof. (2) In a pulsed magnetic field generator that generates a pulsed magnetic field using a capacitor as a main power source, a main winding excited by the charge energy charged in the capacitor and a main winding connected in parallel to the main winding The main magnetic field is generated by exciting the main winding by a short-circuiting injector for applying a main magnetic field near the maximum magnetic field, a correction winding magnetically coupled to the main winding, and exciting the main winding. And a pulse power source for generating a correction magnetic field by reversely exciting the correction winding and generating a flat magnetic field by a combined value thereof. (3) The correction winding described in (1) or (2) is arranged coaxially with the main winding and inside the main winding. (4) In a pulsed magnetic field generator that generates a pulsed magnetic field using a capacitor as a main power source, a main winding excited by the charge energy charged in the capacitor and a main winding that are opposite in polarity to each other are connected in parallel. The main winding includes a correction winding excited by the charge energy of the capacitor, and an auxiliary throwing device that is provided in series with the correction winding and that puts the main magnetic field generated from the main winding near the maximum magnetic field. A flat magnetic field is generated by combining the main magnetic field generated from the line and the correction magnetic field generated from the correction winding.

[0009]

In the pulse magnetic field generator having the structure as described in (1) above, the correction magnetic field generated from the correction winding only corrects the main magnetic field generated from the main winding. It can be made considerably smaller than the current of the main winding, and a small dose of pulsed power supply can be used.

In the pulsed magnetic field generator having the above-mentioned configuration (2), the correction winding is turned on by inserting the short-circuiting throwing device before reverse-exciting the correction winding. Since the reverse excitation is performed, the power consumption of the pulse power supply can be reduced.

With the winding structure having the configuration as described in (3) above, the contribution of the correction winding to the central magnetic field becomes larger, so that the exciting power of the correction winding, that is, the pulse power supply capacity is reduced. be able to.

In the pulse magnetic field generator having the above-mentioned configuration (4), the correction winding is connected in parallel to the main winding with the opposite polarity, and the main magnetic field generated from the main winding is near the maximum magnetic field. Since it is excited by the charge energy of the capacitor, the flat magnetic field can be generated with a simple circuit configuration unless the demand for the precision of the flat magnetic field is so strict.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 11 is a capacitor charged by a power source (not shown), and both ends of this capacitor 11 are connected to a main winding 13 via a charger 12. Further, a correction winding 14 is provided so as to be magnetically coupled to the main winding 13, and an independent small-dose pulse power supply 15 using a semiconductor rectifying element or the like is connected to both ends of the correction winding 14. It

The correction winding 14 is coaxially arranged inside the main winding 13 as shown in FIG. 2, and is designed so that the contribution rate of the correction winding 14 to the central magnetic field becomes larger. . By this, the exciting power of the correction winding 14,
That is, the capacity of the small dose pulse power supply 15 can be reduced.

A magnetic field value calculated from a current flowing through a magnetic field sensor (not shown) or the main winding 13 and the correction winding 14 is input to the small dose pulse power supply 15 as a magnetic field feedback signal 16. .

In the pulsed magnetic field generator having such a configuration, when the charging device 12 is turned on while the capacitor 11 is being charged by the power source (not shown), charge energy is discharged from the capacitor 11 to the main winding 13, As shown in FIG. 3, a main magnetic field waveform close to a sine wave due to the first half wave of the damped oscillation is generated. Here, in FIG. 3, the correction winding 14 is reverse-excited by the small dose pulse power supply 15 to generate a correction magnetic field waveform during the time t1 to t2, and the flat top magnetic field excluding the hatched portion shown in the figure is the composite value thereof. Is generated. In this case, the small dose pulse power supply 15 is current-controlled by the magnetic field feedback signal so that the combined magnetic field value becomes constant.

As described above, in this embodiment, the main winding 13 and the correction winding 14 are provided so as to be magnetically coupled to each other, and the correction winding 1
4 is reverse-excited by the small dose pulse power supply 15 to generate the flat magnetic field, so that the cost can be reduced as compared with the conventional case.

FIG. 4 is a circuit diagram showing another embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Only different points will be described here. In the present embodiment, as shown in FIG. 4, a short-circuiting injector 16 is connected in parallel with the main winding 13, and the short-circuiting injector 16 is turned on before the reverse winding of the correction winding 14 is performed. Is to be short-circuited.

As described above, if the main winding 13 is short-circuited by the short-circuiting injector 16 before the correction winding 14 is reverse-excited, the charge energy of the capacitor 11 is not supplied to the main winding 13, so that the flat top magnetic field is reduced. There is an advantage that the power consumption of the small dose pulse power supply 15 for generating

FIG. 5 is a circuit diagram showing still another embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Here, only different points will be described. In the present embodiment, as shown in FIG. 5, the correction winding 14 for generating the correction magnetic field waveform is connected in parallel to the main winding 13 with the opposite polarity, and the auxiliary throwing device 17 is provided in the parallel circuit. It is a thing.

In the pulse magnetic field generator having such a structure, when the auxiliary injector 17 is turned on at time t3 in FIG. 6, the correction winding 14 generates a correction magnetic field waveform having a polarity opposite to that of the main magnetic field as shown in the figure. In this case, the correction winding 14 is the main winding 13
Since the inductance is smaller than
The resonance frequency with the capacitance is smaller than that of the main winding 13.
Therefore, the relationship between the time width of the main magnetic field waveform and the correction magnetic field waveform is
It is clear that the result is qualitatively as shown in FIG. 6, and the flat top magnetic field as shown by the dotted line in the figure can be obtained.

Further, by properly designing the correction winding 14 and the main winding 13 electrically, a more constant flat top magnetic field can be easily obtained. The pulsed magnetic field generator shown in FIG. 5 can be applied when the requirements for the accuracy of the flat top magnetic field are not so strict, and can generate the flat top magnetic field with a simple circuit configuration.

[0023]

As described above, according to the present invention, the main winding is excited by the charge energy charged in the capacitor to generate the main magnetic field, and the correction winding is reverse-excited with respect to the main winding. Since the flat top magnetic field is generated in the main magnetic field, it is possible to provide the pulse magnetic field generation device which has a simpler circuit configuration than the conventional one and can reduce the cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a pulsed magnetic field generator according to the present invention.

FIG. 2 is a structural explanatory view of a main winding and a correction winding in the same embodiment.

FIG. 3 is a pulse magnetic field waveform diagram generated by the pulse magnetic field generator of the embodiment.

FIG. 4 is a circuit diagram showing another embodiment of the present invention.

FIG. 5 is a circuit diagram showing still another embodiment of the present invention.

FIG. 6 is a pulse magnetic field waveform diagram generated by the pulse magnetic field generator of the embodiment.

FIG. 7 is a circuit diagram showing a conventional pulsed magnetic field generator.

[Explanation of symbols]

11 ... Capacitor, 12 ... Charger, 13 ... Main winding, 14 ... Correction winding, 15 ... Small dose pulse power supply, 1
6 ... Short-circuiting injector, 17 ... Auxiliary injector.

Claims (4)

[Claims] 1. A pulsed magnetic field generator for generating a pulsed magnetic field using a capacitor as a main power source, and a main winding excited by charge energy charged in the capacitor,
A correction winding magnetically coupled to the main winding and a correction magnetic field are generated by exciting the correction winding reversely when the main magnetic field is generated by the excitation of the main winding. A pulsed magnetic field generation device comprising: a pulsed power supply that generates a flat magnetic field based on a combined value. 2. A pulsed magnetic field generator for generating a pulsed magnetic field using a capacitor as a main power source, the main winding being excited by the charge energy charged in the capacitor,
A short-circuiting injector connected in parallel to the main winding and a main magnetic field generated from the main winding is supplied in the vicinity of the maximum magnetic field, and a correction winding magnetically coupled to the main winding, And a pulsed power source for generating a flat magnetic field by a combined value of the main windings when the main magnetic field is generated by exciting the main windings. Pulsed magnetic field generator. 3. The pulse magnetic field generator according to claim 1, wherein the correction winding is arranged coaxially with the main winding and inside the main winding. 4. A pulsed magnetic field generator for generating a pulsed magnetic field using a capacitor as a main power source, a main winding excited by charge energy charged in the capacitor,
A correction winding that is connected in parallel with the main winding and has the opposite polarity and is excited by the charge energy of the capacitor, and a main magnetic field that is provided in series with the correction winding and that is generated from the main winding is near the maximum magnetic field. A pulse which is characterized in that a flat magnetic field is generated by synthesizing a main magnetic field generated from the main winding and a correction magnetic field generated from the correction winding. Magnetic field generator.