JPH01194300A - Laminate electromagnet - Google Patents

Abstract

PURPOSE:To improve the size accuracy at a low cost by laminating plural electromagnetic steel plates to compose a yoke in a circular form by shifting the positions little by little, and processing the end of the magnetic pole mechanically after fixing them. CONSTITUTION:Punched electromagnetic steel plates 1 of one pattern of constant form are prepared, and the sheets of them to be the length of a yoke are laminated in the length direction. In this case, they are laminated shifting the positions sheet by sheet to make the magnetic pole center line 5 into a curvature along the radius of curvature B of the electromagnet, and fixed by the adhesion or welding. After that, the end surfaces of the magnetic poles are cutting-process ed responding to deflection angle A and beam incident and output angles to make into a laminate yoke 2, and coils 4 are attached to make into an electromagnet for a beam accelerator. By such a constitution, the steel plates can be laminated accurately at a low cost, and the deflection angle, and the incident and the output angles can be selected freely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview of the Field] The present invention relates to a method for laminating a laminated yoke of a laminated electromagnet using electromagnetic steel sheets, which is used in a beam accelerator such as a synchrotron.

[Contents and problems of conventional technology]

Conventionally, in this type of laminated electromagnet, in order to align with the traveling direction of the beam, the laminated yokes were stacked in a fan shape so that the pole end face was aligned with the beam traveling direction, but in this method, punched electromagnetic steel sheets were used. Prepare by cutting into various shapes,
Since the magnetic poles are stacked in a wedge shape to form a sector-shaped magnetic pole, the work is complicated and dimensional accuracy is difficult to achieve.

[Purpose of the invention]

In order to eliminate these drawbacks, the present invention uses only one type of punched electromagnetic steel sheet for constructing the yoke, and slightly cuts one type of electromagnetic steel sheet so that the center of the magnetic pole coincides with the curvature along which the beam travels. To provide a laminated electromagnet at low cost and with good dimensional accuracy by stacking the sheets in a circular shape by shifting the stacking positions one by one, fixing the steel plates by impregnation or welding, and then machining the magnetic pole tip to form the shape of the magnetic pole tip. The purpose is to

[Structure of the invention]

Electromagnets used in beam accelerators such as synchrotrons use alternating current for excitation current, so a yoke made of laminated electromagnetic steel sheets with a thickness of 0.5 to 1 mm is used, and in order to match the effective area of the magnetic field to the curvature of the beam. The magnetic pole part is arcuate along the beam, and the shape of the magnetic pole tip part is determined by the values of the deflection angle and the exit angle according to the beam requirements. An excitation coil is arranged around the magnetic pole, and in order to improve the quality of the beam, the magnetic pole shape, the size of the magnetic pole gap, and the parallelism are adjusted to ±0.
A high precision of 0.05 mm is required, but in the present invention, in a laminated electromagnet using a laminated yoke for a beam accelerator, the electromagnetic steel plate constituting the yoke has one type of shape, and the magnetic pole of the electromagnet in the beam traveling direction is It is constructed by laminating magnetic steel plates while shifting them in the shape of a magnetic pole along the radius of curvature of the center, and by machining the end faces of the magnetic pole.

[Explanation based on examples]

Conventionally, when making this type of laminated yoke, as shown in Fig. 2, four to six different shapes of electromagnetic steel plates are punched out to form the shapes shown in Figs. 2 (a), (b), and (c). After laminating them in advance, they were laminated in a fan shape as shown in Figures 3(a) and 3(b) to form an electromagnet.

According to the methods shown in Fig. 2, Fig. 3, the lamination method becomes complicated, and the accuracy of the magnetic pole gap method and the parallelism of the magnetic pole surfaces, which are important for laminated electromagnets, deteriorates, and the accuracy of the deflection angle also deteriorates. It had some serious drawbacks.

The laminated yoke according to this invention prepares one type of punched-out electrode steel plates with two fixed shapes as shown in Fig. 1(a), and laminates them in the length direction of the electromagnet in a number that corresponds to the yoke length. The sheets are shifted one by one and stacked and fixed so that tll+15 has a curvature along the radius of curvature B of the electromagnet. The fixing method is by adhesion or welding. Thereafter, the end face of the magnetic pole is cut to correspond to the deflection angle A of the electromagnet and the angle of incidence and exit of the beam as shown in FIG. It is something.

In this lamination method, punched electromagnetic steel plates of a fixed shape are laminated at different positions, so that the lamination can be easily and accurately performed, and the deflection angle and the exit angle can be set freely.

〔Effect of the invention〕

As described above, by using an electromagnet having a laminated yoke according to the present invention, it is possible to provide an electromagnet for a beam accelerator at low cost and with good dimensional accuracy. −

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a laminated electromagnet according to the present invention. (a) is a front view showing the shape of electromagnetic steel sheets to be laminated. (b) is a plan view of the laminated electromagnet. (c) is a perspective view. (d) is a diagram showing one cutaway view. FIG. 2 is a diagram showing a laminated element constituting a conventional laminated electromagnet. (a) is a front view showing the shape of electromagnetic steel sheets to be laminated. (b) is a side view. (C) is a perspective view. FIG. 3 is a diagram showing a laminated electromagnet constituting a conventional laminated electromagnet. (a) is a plan view. (b) is a perspective view. Margin 1 below. 12.13.14...Electromagnetic steel plate. 2...Laminated yoke. 3...Magnetic pole. 4...Coil. 5...Magnetic pole center line. 6...Magnetic pole gap.・A...Deflection angle. B...Radius of curvature of the electromagnet. Patent applicant: Tohoku Metal Industry Co., Ltd. Figure 1 cd) (C) Figure 2 (a> (b) (C')

Claims (1)

[Claims] In a laminated electromagnet using a laminated yoke for a beam accelerator, the electromagnetic steel plate constituting the yoke has one type of shape, and the magnetic steel plate is shaped like a magnetic pole along the radius of curvature of the magnetic pole center of the electromagnet in the beam traveling direction. A laminated electromagnet characterized by stacking the layers while shifting them.