JPH02151249A - Rotor for reluctance motor - Google Patents

Abstract

PURPOSE:To retard eddy currents by bundling a plurality of wires having magnetic anisotropy in the longitudinal direction then arranging the end sections of the wires such that they are perpendicular to a rotary shaft. CONSTITUTION:A shaft 11 penetrates through a hole made in the center of a cross stopper 14 and magnetic paths 13 are formed with bundles of wires at respective tops of the cross. Wires forming the magnetic paths 13 are inserted into openings 31a-31d of the stopper 14. The wires have magnetic anisotropy in the longitudinal direction and arranged such that the ends thereof are perpendicular to the rotary shaft. Wires are secured on another by means of the stopper 14 at a recess and also secured to the shaft 11. By such arrangement, a rotor for a reluctance motor having high radial magnetic resistance at the recess and high inner axial electrical resistance can be constituted, resulting in a reluctance motor having a low eddy current loss rotor.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rotor for a reluctance motor.

[Prior Art] Fig. 2 is a perspective view showing the structure of a rotor with anisotropy of a conventional reluctance motor, in which 21 is a shaft, 22 is an iron core laminated parallel to the axis, and 23 is a fixed laminated iron core. It is a bolt that can be used. This rotor has a salient pole structure, and uses the principle of obtaining rotational force by utilizing the difference between the magnetic resistance of the convex portion and the magnetic resistance of the concave portion. The conventional anisotropic rotor shown in FIG. 2 has a large radial magnetic resistance in the concave portions, and is formed by laminating plates parallel to the axis 21 in order to reduce the radial magnetic resistance in the convex portions. has been done. In addition, the laminated iron core 22
is fixed to the shaft 21 with a bolt 23.

[Problems to be Solved by the Invention] The conventional axially laminated anisotropic rotor shown in FIG. 2 has the following drawbacks.

In the conventional reluctance motor described above, a magnetic field is applied in the radial direction and the motor rotates around the shaft 21, so that eddy current flows parallel to the shaft 21. When this eddy current flows, Joule heat generation occurs due to the eddy current, the temperature of the rotor increases, and the motor efficiency decreases due to eddy current loss.

An object of the present invention is to provide a rotor for a reluctance motor that can solve the above conventional problems.

[Means for Solving the Problems] In the present invention, in order to make it difficult for eddy current to flow in the axial direction in the rotor of a reluctance motor, the magnetic path of the rotor is made difficult to flow in the axial direction while having the magnetic anisotropy of the uneven portion. It is made of wire-like material.

That is, the rotor of the reluctance motor according to the present invention is characterized in that a plurality of wires having magnetic anisotropy in the longitudinal direction are bundled together, and the ends of the wires are arranged so as to be perpendicular to the rotation axis.

[Function] According to the present invention, by constructing the magnetic path of the rotor by bundling wire-like materials having anisotropy in the longitudinal direction, magnetic anisotropy can be freely imparted depending on the shape of the wires. Can be done.

Also, almost no eddy current flows in the axial direction.

[Example] FIG. 1 is a perspective view showing an example of the present invention, and 11
is a shaft, 12 is a magnetic path 13 made of bundled wires is a filling, and 14 is a cross-shaped retainer.

FIG. 3 shows a detailed view of the presser 14. 31a-31d
are openings, into which wires forming the magnetic path 12 are inserted as shown by dotted lines. 32 is a hole through which the shaft 11 passes.

FIG. 4 shows a detailed view of the magnetic path 12. The wire is magnetic path 12
It is formed in the shape of. However, the wire here is obtained by cutting an iron plate into thin pieces, for example, and has anisotropy in its longitudinal direction.

For fixing the wires, the wires are fixed to each other and also to the shaft 11 using pressers 14 in the recessed portions. here,
The presser 14 can also be made of a magnetic material.

Furthermore, since the filler 13 is used to fix the convex end of the wire, it needs to be made of a non-magnetic material such as resin.

[Effects of the Invention] According to the present invention, it is possible to configure a rotor of a reluctance motor in which the concave portion of the rotor has a large radial magnetic resistance and the rotor has a large axial electrical resistance. A rotor reluctance motor with magnetic anisotropy similar to that of conventional axially laminated rotors and low eddy current loss can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of one embodiment of the present invention, and FIG.
The figure is a perspective view showing a conventional anisotropic rotor.
A detailed view of the presser in the figure, and FIG. 4 is a detailed view of the wire assembly in FIG. 1. 11... Axis, 12... Magnetic path made of bundled wires, 14...
・Hold it down. Figure 1 Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] A rotor for a reluctance motor, characterized in that a plurality of wires having magnetic anisotropy in the longitudinal direction are bundled together, and the ends of the wires are arranged so as to be perpendicular to a rotation axis.