JPH05207689A - Permanent magnet type rotor - Google Patents

Abstract

PURPOSE:To simply fix iron plates of a laminated iron plate core without necessity of another member such as a clamping pin, etc., and to effectively prevent scattering of dropped powder due to cutout of a magnet. CONSTITUTION:At least one of both longitudinal ends of a nonmagnetic metal pipe 4 protrudes to an end plate 21 disposed at a laminating end of iron plates 2 of a laminated iron plate core 1. An outer diameter of at least one plate 21 of the plates 21 is increased larger than that of the pipe 4, and the peripheral edge of the plate 21 is curled to be brought into pressure contact with the protrusion 41 of the pipe 4, thereby effectively fixing the plate 21 to the pipe 4. Thus, the plate 2 of the core 1 is simply fixed only by the plate 21 without using a clamping pin thereby to alleviate the cost of components. In this manner, a complicated clamping operation of the pin can be eliminated, the entire surfaces of the core 1 and the magnet 3 are covered to be sealed by the plate 21, thereby effectively preventing scattering of dropped powder of the magnet 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated iron plate core having a plurality of partially arcuate magnets arranged along the outer peripheral surface of the laminated iron plate core formed by laminating a plurality of iron plates. The present invention relates to a permanent magnet-type rotor that covers almost the entire outer circumference and has a non-magnetic metal pipe fitted to the outer circumference of each magnet.

[0002]

2. Description of the Related Art Conventionally, a permanent magnet type rotor of this type is described in, for example, Japanese Patent Application Laid-Open No. 2-246748, and, as shown in FIGS. 4 and 5, a plurality of iron plates are laminated. A plurality of partially arcuate magnets B along the outer peripheral surface of the laminated iron plate core A are arranged on the outer periphery of the laminated iron plate core A, and the laminated iron plate core A
Is formed by press-fitting a non-magnetic metal pipe C on the outer circumference of each magnet B while covering almost the entire outer circumference.
In order to fix each of the iron plates of the laminated iron plate core A, a plurality of through holes D penetrating in the axial direction are formed in the laminated iron plate core A, while the laminated iron plate core A and the magnet B are formed.
The plate-like non-magnetic end plates E that cover these end faces are provided on both axial end faces, and holes are formed in the end plates E at positions corresponding to the through holes D provided in the laminated iron plate iron core A. The clamp pin F is penetrated by aligning the holes, and the laminated iron plate iron core A is clamped integrally by the clamp pin F in a state of being sandwiched by the flat plate-shaped non-magnetic end plate E, and the flat plate-shaped non-magnetic end plate E is used. It was intended to prevent the falling powder of the magnet B from scattering.

[0003]

However, in the above-mentioned conventional permanent magnet type rotor, in order to fix the laminated iron plate iron core A, the clamp pin F penetrating a plurality of through holes formed in the iron core A. Since it is necessary to separately form the parts, the cost of the parts is increased, and the work of fixing the clamp pins F through the iron core A is also required, resulting in a large number of assembly steps.

The present invention has been made in view of the above problems, and an object thereof is to easily fix the laminated iron plate iron core without the need for a separate member such as a clamp pin, and It is an object of the present invention to provide a permanent magnet type rotor capable of reliably preventing scattering of fallen powder due to chipping.

[0005]

In order to achieve the above object, the present invention has a partial arcuate shape along the outer peripheral surface of a laminated iron plate core 1 formed by laminating a plurality of iron plates 2. A permanent magnet rotor in which a plurality of magnets 3 are arranged to cover substantially the entire outer circumference of the laminated iron plate iron core 1 and a non-magnetic metal pipe 4 is fitted on the outer circumference of each magnet 3. At least one of both ends of the pipe 4 in the length direction is connected to the iron core 1
End plate 21 located at the end in the stacking direction of the iron plate 2 in
And the outer diameter of at least one of the end plates 21 is made larger than the outer diameter of the pipe 4, and the peripheral edge of the end plate 21 is curled to make the pipe 4
That is, it is pressure-bonded to the protruding portion 41 of.

[0006]

By curling the peripheral portion of the end plate 21 and press-bonding it to the projecting portion 41 of the non-magnetic metal pipe 4,
Since this end plate 21 is securely fixed to the non-magnetic metal pipe 4, each iron plate 2 of the conventional laminated iron plate iron core 1 is fixed.
Since each iron plate 2 of the laminated iron plate iron core 1 can be easily fixed only by the end plate 21 without using a clamp pin for fixing each of them, the cost of parts is reduced as compared with the conventional one, and it is complicated. Also, the work of fixing the clamp pin is eliminated, and the manufacturing cost is reduced accordingly.
Further, the end plate 21 includes the laminated iron plate core 1 and the magnet 3
Since the entire surface of the magnet 3 is covered in a hermetically sealed manner, the falling powder of the magnet 3 is reliably prevented from scattering.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A permanent magnet type rotor according to the present invention will be described below with reference to the drawings. The permanent magnet rotor shown in FIG.
A plurality of disk-shaped iron plates 2 having an insertion hole 2a through which a drive shaft is inserted at the center are laminated to form a cylindrical laminated iron plate core 1, and the iron core 1 is provided on the outer periphery of the laminated iron plate core 1. Four partial arc-shaped magnets 3 along the outer peripheral surface of the laminated iron plate are arranged to cover substantially the entire outer circumference of the laminated iron plate core 1, and a non-magnetic material is interposed between the magnets 3. .. Then, the non-magnetic metal pipe 4 is press-fitted onto the outer periphery of each magnet 3 and fitted,
By the non-magnetic metal pipe 4 and the laminated iron plate iron core 1,
While fixing the magnet 3, the end plates 21 located at both ends of the laminated iron plate core 1 in the stacking direction are formed to have a size to cover the end surface of the magnet 3, and the magnet 3 is protected by the end plate 21. I am doing it.

Therefore, in the permanent magnet type rotor described above, at least one of both ends in the length direction of the non-magnetic metal pipe 4 is positioned at the end of the laminated iron plate core 1 in the laminating direction of the iron plate 2. At least one end plate 2 of the end plate 21 is made to project with respect to the end plate 21.
The outer diameter of 1 is made larger than the outer diameter of the pipe 4, and the peripheral edge portion of the end plate 21 is curled and pressure-bonded to the protruding portion 41 of the pipe 4.

Specifically, when the non-magnetic metal pipe 4 is fitted to the outer circumference of each magnet 3, both end portions in the length direction are located at the end portions in the stacking direction of the laminated iron plate core 1. 21 and projecting portions 41, 41 are formed, and the end plate 21 is formed such that its outer diameter is larger than that of the pipe 4, as shown in FIG. The non-magnetic metal pipe 4 is formed by curling the peripheral portion of the end plate 21 into a mountain shape that covers the protruding portion 41 to form a curl portion 21a.
After press-fitting to the outer circumference of each magnet 3, each end plate 21 is fitted to both ends of the non-magnetic metal pipe 4, and the curled portion 21a of the end plate 21 covers the protrusion 41. The end portion 21 is fixed to the non-magnetic metal pipe 4 by pressing the curl portion 21a into contact with the protruding portion 41 and joining the curled portion 21a.

At this time, the protrusion 41 and the curl portion 21
Since the curl portion 21a covers the surface of the non-magnetic metal pipe 4 at the joint portion with a, the thickness of the end plate 21 is formed between the end portion 21 and the stator ST shown by the dashed line in FIG. The thickness is smaller than the air gap, that is, the thickness is within the range of the air gap. The axial length of the permanent magnet rotor is formed such that the joints are located outside the stator ST, and the air between the permanent magnet rotor and the stator ST is formed. The gap is secured. Although the end plate 21 is formed of the iron plate 2, it may be formed of a plate material made of a non-magnetic material.

Thus, the end plate 21 covers the entire surface of the laminated iron plate core 1 and the magnet 3, and the curl portion 21a of the end plate 21 is protruded from the non-magnetic metal pipe 4.
Since the end plate 21 can be reliably fixed to the non-magnetic metal pipe 4 by pressure-bonding to, the clamp pin for fixing each iron plate 2 of the laminated iron plate iron core 1 as in the related art is used. The iron plates 2 of the laminated iron plate iron core 1 can be fixed only by the end plates 21 without using them, and further, the end plates 21 and the non-magnetic metal pipe 4 can be hermetically sealed, so that the magnet 3 It is possible to reliably prevent the falling powder from scattering.

Further, the nonmagnetic metal pipe 4 is provided with a protrusion 41, and the protrusion 41 is curled by the end plate 21 and pressure-bonded to cover the magnet 3. It is possible to prevent the outer peripheral edge of the magnet 3 from cracking, and it is possible to omit the chamfering process that was performed to prevent this cracking.

The protrusion 41 of the non-magnetic metal pipe 4
May be bent inward in the radial direction while the end plate 21 is curled and pressure-bonded to the protrusion 41,
In doing so, the curl portion 2 at the joint portion
Since the end portion of 1a can be located at almost the same position as the outer diameter of the non-magnetic metal pipe 4, even if the length of the non-magnetic metal pipe 4 is made substantially the same as the length of the stator ST, the stator ST is It is possible to prevent contact with.

The permanent magnet type rotor of the present invention is shown in FIG.
It may be formed as shown in FIG. The embodiment shown in FIG.
Of the protrusions 41 provided at both ends in the length direction of the non-magnetic metal pipe 4, when inserting into the stator ST, the tip of the protrusion 41a, which is the tip side in the insertion direction, is bent inward in the radial direction. The end plate 21 is formed by machining so as to fit in the non-magnetic metal pipe 4 and is fixed by bending the protruding portion 41a. The end plate 21 located on the side of the protruding portion 41b is formed so as to have a diameter larger than the outer diameter of the pipe 4, and the protruding portion 41 is curled outward, and at the same time, the peripheral edge portion of the end plate 21 is It is wound so as to follow the curl shape of the protrusion 41b, curled, and then tightened and joined. In this case, since the joint portion is wound and tightened, its bonding strength is further increased. Further, since the peripheral edge portion of the end plate 21 and the protruding portion 41b are wound, the end portion 21 is in a protruding state with respect to the outer peripheral surface of the non-magnetic metal pipe 4, but the joint portion is fixed to the stator ST. It is formed so as to be on the rear side in the insertion direction when inserted into the stator, and the joint is located outside the stator ST and inside the inner diameter of the coil end CE of the stator ST. As a result, contact with the stator ST can be prevented.

[0015]

The end plate 21 can be securely fixed to the non-magnetic metal pipe 4 by curling the peripheral portion of the end plate 21 and press-bonding the end plate 21 to the protruding portion 41 of the non-magnetic metal pipe 4. Therefore, it is possible to easily fix each iron plate 2 of the laminated iron plate iron core 1 only by the end plate 21 without using a clamp pin for fixing each iron plate 2 of the laminated iron plate iron core 1 as in the prior art. Since it is possible to reduce the cost of parts compared to the conventional, it is possible to eliminate the complicated work of fixing the clamp pin,
The manufacturing cost can be reduced accordingly. further,
Since the entire surfaces of the laminated iron plate core 1 and the magnets 3 can be hermetically covered by the end plates 21, it is possible to reliably prevent the falling powder of the magnets 3 from scattering.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a permanent magnet type rotor of the present invention.

FIG. 2 is a sectional view of an end plate of the permanent magnet type rotor shown in FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the permanent magnet type rotor of the present invention.

FIG. 4 is a vertical cross-sectional view showing a conventional example.

5 is a cross-sectional view of the conventional example of FIG.

[Explanation of symbols]

 1 Laminated Iron Plate Iron Core 2 Iron Plate 21 End Plate 3 Magnet 4 Non-Magnetic Metal Pipe 41 Projection

Claims (1)

[Claims] 1. An outer periphery of a laminated iron plate core 1 comprising a plurality of partially arcuate magnets 3 arranged along the outer peripheral surface of the iron core 1 formed by laminating a plurality of iron plates 2. Is a permanent magnet type rotor which covers substantially the entire circumference of the magnet 3 and has a non-magnetic metal pipe 4 fitted to the outer circumference of each magnet 3, wherein at least one of both ends in the length direction of the pipe 4 is connected to the iron core 1 The end plate 21 located at the end of the iron plate 2 in the stacking direction, and the outer diameter of at least one end plate 21 of the end plate 21 is made larger than the outer diameter of the pipe 4. A permanent magnet type rotor characterized in that the peripheral portion of 21 is curled and pressure-bonded to the protruding portion 41 of the pipe 4.