JPS61224840A - Manufacture of electromagnetic member - Google Patents

Abstract

PURPOSE:To readily manufacture an electrically uniform magnetically an isotropic rotor by spirally winding a core wire in which many magnetic strips are implanted in a brush shape in one row, compressing the both ends of the core wire by a ring and casting a conductive material. CONSTITUTION:Many magnetic strips 2 are implanted to a core wire 1 in a brush shape in one row, and the strips are spirally wound on the outside (or inside). Then, a core 3 in which steel plates are laminated is inserted into a spiral central space, compressed by rings 4, 4, a bolt 5 and a nut 6, and integrated. After the integrated member is filled in a crucible, not shown, and preheated, melted copper is cast. After cooling, the nut 6, bolt 5 and rings 4 are removed, the outer periphery is cut, and the wire 1 is then removed. Thus, the stator of a double cylindrical induction motor having electrically uniform magnetically an isotropic property can be readily manufactured.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for manufacturing an electromagnetic member employed in a rotor of an induction motor, and more particularly to a method for manufacturing an electromagnetic member having a magnetically anisotropic conductor. It is related to.

[Background of the invention]

For example, as described in JP-A-57-46656, the rotor of an induction motor has a double cylindrical structure, the inner cylinder uses a laminated iron core, and the outer cylinder has magnetic permeability in the radial direction. It is known to use a magnetically anisotropic conductor formed with a magnetic permeability greater than that of . In this case, the magnetically anisotropic conductor that forms the outer cylinder is formed by radially arranging radially long magnetic strips, such as magnetic wires, and casting a conductive material such as steel or aluminum between them. However, because the magnetic permeability varies greatly depending on how the magnetic wires are arranged, it has been difficult to obtain this type of electromagnetic member that has a uniform predetermined magnetic permeability as a whole.

[Purpose of the invention]

The present invention has been conceived in view of this, and its object is to provide a method of manufacturing this type of electromagnetic member that is electromagnetically homogeneous and easy to manufacture.

[Summary of the invention]

That is, in the present invention, first, a plurality of magnetic strips are arranged in parallel, and one end of the arranged magnetic strips is fixed to a core strip to form a brush band. This brush band is then spirally wound to form a forest of magnetic strips. Next, a conductive material is cast into this magnetic strip forest to achieve the desired purpose. In FIG. 1, reference numeral 1 denotes a core wire or core strip material, and nine magnetic wires or magnetic strips 2 made of a large number of iron or the like are embedded in this core wire. The core wire 1 and the magnetic wire 2 form a brush band. The brush band is wound spirally many times so that it has a slightly larger diameter than the outer diameter of the rotor to be manufactured. At that time, the magnetic wire 2 moves toward the inner diameter side,
It is configured to have substantially the same space radially when viewed from the central axis of the spiral, and in the radial direction from the central axis. In other words, the tips of the magnetic wires are trimmed so that they are in contact with the cylindrical surface that shares the central axis of the spiral. 3 is a nine-iron core made up of laminated thin iron plates, the outer periphery of which is in contact with the tip of the magnetic wire. Next, the core wire in which these magnetic wires are implanted and the iron core are firmly tightened on both sides by a tightening bolt 5 and a tightening nut 6 that sandwich a ring 4 and pass through the core wire. That is, the spiral core wires are pressed so that the core wires come into close contact with each other. The length of the core wire is adjusted in advance so that the length in the axial direction at this time is approximately the same as the length of the iron core. The tightening ring 4 is configured to press the core wire and at the same time form an end space 5 that continues in the circumferential direction on the side surface of the magnetic wire and is also connected to the outside.

Next, these members that have been tightened together are preheated in a crucible 7, for example, as shown in FIG. It's crowded. The cast copper fills the space around the magnetic wire and also fills the end space 5. After the cast parts have cooled down, tighten nuts 6, bolts 5, and rings 4.
, and cut the outer periphery to remove the core wire part. In addition,
Tightening will be easier if you consider removing the jigs in advance and apply a release material when assembling.

After removing the bolts, the shaft is press-fitted and molded integrally with the iron core, resulting in a rotor as shown in Fig. 3. 9 in the diagram
is the outer cylinder, 3 is the iron core, and 10 is the shaft. A steel end link 11- is formed at the end of the outer cylinder, and the other part is a magnetic anisotropic member 12 in which magnetic wires 2 are arranged in the radial direction and filled with copper 13, as shown in FIG. is formed. The magnetically anisotropic conductive member exhibits magnetic anisotropy in which the radial magnetic permeability (μ, ) is larger than the circumferential magnetic permeability (μm).

Here, a method of configuring the core wire and magnetic wire will be explained.

The core wire initially extends in a long straight line, and nine magnetic wires are cut to a suitable length and implanted so as to be perpendicular to the core wire on the same plane in the length direction of the core wire. After that, it is easy to manufacture the core wire by winding it in a spiral so that the magnetic wire faces perpendicular to the central axis.When inserting the magnetic wire into the core wire, for example, as shown in Approximately 1/4 inch
A good method is to wrap it twice and then press it with the core cover 14. In this case, it is preferable to provide the core wire cover with a large number of recesses 15 as shown in FIG.

According to this embodiment, a core wire in which a large number of magnetic wires are implanted,
Since the magnetic wires can be arranged radially by simply winding them in a spiral, there is an advantage that a rotor having magnetically anisotropic conductors can be easily produced. Since the bent magnetic wire is supported by the core wire, the magnetic wire does not deviate greatly from the position perpendicular to the central axis, and further presses the core wire in the direction of the central axis.

Therefore, the space factor of the magnetic wires is improved, and a magnetically homogeneous rotor can be obtained. Next, since the iron core is also incorporated at the time of casting, there is an advantage that the iron core and the outer cylinder made of the magnetically anisotropic conductor can be manufactured in one piece. In addition, there is a space in the ring for tightening the ends, so
An advantage is that a steel end ring can be manufactured integrally at the end of the outer cylinder. Further, since a recess is provided to partially reduce the thickness of the core wire in the axial direction, unnecessary gas generated during casting can be guided to the outside, so that casting can be carried out quickly.

Fig. 7 shows another embodiment of the present invention, which differs from Fig. 1 in that magnetic wires are planted in the spiral core wire so as to extend from the central axis to the outer periphery. If the fourth
In the case shown in the figure, there is an advantage in that the magnetic wires can be prevented from intersecting at the tips of the magnetic wires.

In addition, in the example, it was described that iron wire, for example, is used as the magnetic wire, but if a composite magnetic conductor wire, for example, made of iron wire covered with steel, is used instead of the magnetic wire, it will be compatible with the cast steel, so that the casting can be done quickly. It has the advantage of being possible.

Furthermore, FIG. 8 shows an example in which the magnetic wires are shrunk. In this case, the bond between the magnetic wires and the copper becomes stronger, and a mechanically strong rotor can be obtained.

〔Effect of the invention〕

According to the present invention, since magnetic lines can be easily arranged radially, an electromagnetically homogeneous magnetic anisotropic rotor can be easily produced.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an electromagnetic member showing an embodiment of the present invention, Fig. 2 is a partial sectional view showing the same casting state, and Fig. 3 is a rotation using the electromagnetic member of a magnetically anisotropic conductor. FIG. 4 is an enlarged view of the A frame in FIG. 3, FIG. 5 is an enlarged perspective view of the core wire part showing an embodiment of the present invention, and FIG. 6 is a plan view of the core wire cover. FIGS. 7 and 8 show other embodiments of the present invention, and are perspective views of magnetic strips. 1... Core wire (core strip material), 2... Magnetic wire (magnetic strip material)
, 3... Iron core, 8... Molten steel, 9... Outer cylinder,
DESCRIPTION OF SYMBOLS 10... Shaft, 11... End ring, 12... Magnetic anisotropic conductive member.

Claims (1)

[Scope of Claims] 1. When manufacturing an electromagnetic member by casting a conductive material into a space of magnetic strips arranged in parallel, a) A plurality of magnetic strips are arranged in parallel, a step of fixing one end of the magnetic strip to a core strip to form a brush strip; b) a step of spirally winding the brush strip to form a forest of magnetic strips; c) a step of forming a forest of magnetic strips; A method for manufacturing an electromagnetic member, comprising the step of casting a conductive material into a forest. 2. The method of manufacturing an electromagnetic member according to claim 1, wherein the brush band is wound spirally so that the core strip of the brush band is on the outer peripheral side.