KR960001989Y1 - Permanent magnet fixing structure - Google Patents

Abstract

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Description

Magnetic separation prevention device of permanent magnet rotor

1 is a cross-sectional view of a conventional permanent magnet rotor

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is an exploded perspective view of the magnetic separation prevention device of the permanent magnet rotor of the present invention

* Explanation of symbols for main parts of the drawings

101: rotation axis 102: rotor yoke

103: permanent magnet 104: overhang

104 ': non-overhanging portion 105: non-magnetic metal barrel

The present invention relates to a device for preventing magnet detachment of a permanent magnet rotor. In particular, the magnet is prevented from being separated by the centrifugal force generated when the permanent magnet rotor of the non-commutator motor rotates.

Conventionally, as shown in Figs. 1 and 2, the rotor yoke 2 and the permanent magnet 3 formed on the rotating shaft 1 are die casted by the die casting part 5 so that the non-magnetic metal cylinder 4 is placed on the rotating shaft 1. Integrated.

However, since the electrical gap (difference between the stator inner shaft radius and the rotor magnet outer shaft radius) is increased by the nonmagnetic metal cylinder 4, the efficiency is lowered due to electrical output reduction.

If the mechanical gap (the difference between the outermost radius of the non-magnetic metal cylinder and the stator radius) is small to prevent the output degradation, the interference with the stator inner diameter due to the nonuniformity of the non-magnetic metal cylinder 4 It is difficult to assemble due to the like, the defect rate is increased.

And the permanent magnet rotor is landed after complete assembly. The non-magnetic metal cylinder increases the electric air cap, which increases the magnetizing capacity, which increases the leakage component and increases the loss when magnetized. (Full) There is a tendency not to magnetize.

In addition, the die casting increases the material cost of the permanent magnet rotor and increases the manufacturing time.

The present invention has been devised in view of the above-mentioned problems, and the overhangs are formed at both ends of the permanent magnets surrounding the rotor yoke, which are arranged on the rotating shaft, and the overhangs are fixed with a non-magnetic metal barrel to prevent the permanent magnets from being separated.

Referring to Figure 3 illustrates the magnet departure prevention device of the permanent magnet rotor of the present invention.

A non-magnetic metal cylinder 105 is press-fitted into the overhang portion 104 and the overhang portion 104 formed at both ends of the permanent magnet 103 surrounding the rotor yoke 102 arranged on the rotary shaft 101. Configured.

The overhang portion 104 has a smaller outer diameter than the non-overhang portion 104 and fixes the non-magnetic metal cylinder 105 to the overhang portion 104 by an adhesive or press-fit.

And, in another embodiment, the overhang portion was wrapped with a molding or wrapped with tape or thread to fix it.

Referring to Figure 3 illustrates the effects of the present invention configured as described above.

According to the present invention, a non-magnetic metal cylinder l05 is press-fitted into an overhang portion 104 formed at both ends of the permanent magnet 103 surrounding the rotor yoke 102 arranged on the rotary shaft 101.

In particular, the overhang portion 104 is produced by the rotation of the permanent magnet rotor by making the outer diameter smaller than the non-overhang portion 104 'and inserting and fixing the non-magnetic metal cylinder 105 to the overhang portion 104. It is possible to provide a non-magnetic metal barrel 105 of the thickness that can resist the centrifugal force of the permanent magnet.

That is, in the related art, in order to make the electrical gap as small as possible, the radial thickness of the non-magnetic metal cylinder is limited when the whole is covered with the non-magnetic metal cylinder in the axial direction, and the centrifugal force is the number of revolutions in the case of the permanent magnet rotor having a high speed rotation. It became extremely large in proportion to the square of, and it was difficult to prevent the permanent magnet from being separated.

However, in the present invention, when the thickness of the non-magnetic metal cylinder is thickened to resist the centrifugal force generated by the high speed, the jaw of the overhang portion is made larger so that the outer diameter can be solved so that it can be easily applied even at the high speed.

And because it does not affect the electrical gap, the output and efficiency is increased, and because it does not affect the electrical gap at the time of magnetization, the magnetization efficiency can be increased, so full magnetization is possible.

In addition, the material cost is reduced and the design is easy to manufacture.

Claims (5)

An overhang portion formed at both ends of the permanent magnet surrounding the rotor yoke arranged on the rotating shaft; The magnetic separation prevention device of the permanent magnet rotor, characterized in that the non-magnetic metal cylinder is pressed into the overhang portion to be fixed. The method of claim 1, The overhang portion has a smaller outer diameter than the nonoverhang portion, characterized in that the magnet separation prevention device of the permanent magnet rotor. The method of claim 1, A magnet departure preventing device of a permanent magnet rotor, characterized in that it is wrapped with a die-casting member to fix the non-magnetic metal cylinder pressed into the overhang portion. The method of claim 1, A magnet anti-separation device for a permanent magnet rotor, characterized in that the overhang is covered with a molding. The method according to claim 1 or 4, A magnet separation prevention device for a permanent magnet rotor characterized in that the overhang is wrapped with tape or thread to fix the overhang.