JPH05146102A - Permanent magnet type rotor - Google Patents

Abstract

PURPOSE:To obtain a permanent magnet-type rotor having a laminated steel plate iron core which can be secured easily by fixing the steel plates by causing caulked projections of one steel plate to fit in with those of another when laminating the steel plates and by securing the end steel plates to the end of a pipe to make the end steel plates and the pipe into one body. CONSTITUTION:In a permanent magnet-type rotor, I-shaped cuts arc made halfway in the diameter direction of each steel plate 2 and the plurality of caulked projections 22 are formed in the cuts and such steel plates are laminated and fixed with the caulked projections of one steel plate being fit in with those of another and thus a laminated steel plate iron core 1 is formed. The end steel plates 2a, 2a which are located at both ends in the lamination direction are so formed as to have an outer diameter which are nearly the same as an inner diameter of a non-magnetic metal pipe 4. The end steel plates 2a, 2a are secured by press fitting to the end of the non- magnetic metal pipe 4. Thus, a magnet 3 is fixed air-tightly by the end steel plates 2a, 2a, the non-magnetic metal pipe 4 and the laminated steel plate iron core 1. Therefore, the magnet can be secured easily without using other members such as clump pins and ! the magnet 3 is prevented from chipping off and the powder falling from the magnet 3 when the magnet chips off is prevented from scattering outside the rotor.

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 which covers substantially the entire outer circumference and has a non-magnetic metal pipe press-fitted into 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. 17 and 18, a plurality of iron plates are laminated. A plurality of partially arcuate magnets B arranged 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 to cover almost the entire outer periphery of the laminated iron plate core A, and at the outer periphery of each magnet B. The non-magnetic metal pipe C is press-fitted and formed, but in order to fix each iron plate of the laminated iron plate core A, a plurality of through holes D axially penetrating the laminated iron plate core A are formed. On the other hand, flat non-magnetic end plates E for covering the end faces of the laminated iron plate core A and the magnet B in the axial direction are provided, and the through holes D formed in the laminated iron plate core A are provided in the end plate E. Form a hole at the position corresponding to and clamp each hole and clamp pin It passed through the said laminated iron plate core A
While being clamped by the flat non-magnetic end plate E, they are integrally fixed by the clamp pin F, and the flat non-magnetic end plate E prevents the falling powder of the magnet B from scattering.

[0003]

However, in order to fix the laminated iron plate iron core A, the conventional permanent magnet type rotor described above has the flat plate-shaped non-magnetic end made of a material different from that of the iron core A. Since the plate E is required and the clamp pin F penetrating through the plurality of through holes formed in the iron core A must be separately formed, the cost of the component is increased accordingly and the clamp pin is attached to the iron core A. Since the work of penetrating F and fixing is also required, there is a problem that the number of assembling steps increases.

The present invention has been made in view of the above problems, and an object thereof is to easily fix the laminated iron plate core without requiring a separate member and to attach the balance weight to the rotor. Another object is to provide a permanent magnet type rotor that can be easily installed.

[0005]

In order to achieve the above object, the present invention has a partial arcuate shape along the outer peripheral surface of the iron core 1 on the outer periphery of a laminated iron plate core 1 formed by laminating a plurality of the iron plates 2. A permanent magnet type rotor in which a plurality of magnets 3 are provided to cover substantially the entire outer circumference of the laminated iron plate core 1 and a non-magnetic metal pipe 4 is press-fitted into the outer circumference of each magnet 3. A plurality of caulking protrusions 22 are formed on each iron plate 2
Of the iron plate 2 at both ends in the stacking direction of the iron plate 2 while the caulking projections 22 are engaged and fixed when the iron plate 2 is stacked.
The outer diameters of a and 2a are set to be substantially the same as the inner diameter of the pipe 4, and the end iron plates 2a and 2a are fixed to the ends of the pipe 4 by a fixing means, and the pipe 4 and the laminated iron plate iron core 1 And the magnet 3 are integrated.

In addition, each of the thin plates 51 of the balance weight 5 formed by laminating a plurality of thin plates 51 is fitted with a first crimping projection 22 for fixing the iron core provided on the end iron plate 2a. By forming the caulking protrusion 52, the balance weight 5 is moved to the end iron plate 2a by engaging the second caulking protrusion 52 with the first caulking protrusion 22.
May be fixed to the non-magnetic metal pipe 4 at this time.
Balance weight 5 is attached to the end of the balance weight mounting side.
It is preferable to provide the extension portion 41 that protrudes from the stack height.

Further, the length of the laminated iron plate core 1 in the laminating direction is made longer than the axial length of the magnet 3 so that the axial end of the magnet 3 and the end iron plate 2 fixed to the non-magnetic metal pipe 4 are fixed.
It is also possible to form an annular space 6 with respect to a and to fix the balance weight 5 to the annular space 6 by pressing the end iron plate 2a against the axial end of the magnet 3.

Further, the height of the laminated iron plate core 1 in the laminating direction is made longer than the axial length of the magnet 3, and the diameter of the iron plate 2 located axially outward with respect to the axial end of the magnet 3. The balance weight portion 23, which extends outward in the direction and overlaps with the magnet 3 and has a partial arc shape, may be integrally formed.

[0009]

When the iron plates 2 are stacked, the caulking protrusions 22 are engaged and fixed, and the end iron plates 2a, 2a are fixed to the end portions of the non-magnetic metal pipe 4 by a fixing means. 4 and the laminated iron plate iron core 1 and the magnet 3 are integrated, so that the laminated iron plate iron core 1 and the magnet 3 are integrally fixed without any separate member such as a clamp pin. You can do it.

In addition, each balance plate 5 of the balance weight 5 formed by laminating a plurality of thin plates 51 has a second balance weight fixing part which engages with a first caulking protrusion 22 for fixing an iron core provided on the end iron plate 2a. By forming the caulking protrusion 52, the balance weight 5 is moved to the end iron plate 2a by engaging the second caulking protrusion 52 with the first caulking protrusion 22.
The balance weight 5 can also be easily attached by engaging the second caulking protrusion 52 with the first caulking protrusion 22 when fixed to.

Moreover, when the balance weight 5 is provided with an extension portion 41 projecting from the stacking height of the balance weight 5 at the balance weight mounting side end portion of the nonmagnetic metal pipe 4, even if the balance weight 5 receives a centrifugal force, It can be protected by the magnetic metal pipe 4.

Further, the length of the laminated iron plate iron core 1 in the laminating direction is made longer than the axial length of the magnet 3, and the end iron plate 2a fixed to the axial end of the magnet 3 and the non-magnetic metal pipe 4. An annular space 6 is formed between the balance weight 5 and the balance weight 5, and the balance weight 5 is fixed to the annular space 6 by pressing the end iron plate 2a against the axial end of the magnet 3. 5 can be sandwiched and fixed by the magnet 3 and the end iron plate 2a, so that the end iron plate 2a can be simply fixed to the non-magnetic metal pipe 4 without providing fixing means on the balance weight 5. And the balance weight 5 is attached to the end iron plate 2
It can be protected by a.

Further, the height of the laminated iron plate iron core 1 in the laminating direction is made longer than the axial length of the magnet 3 so that the diameter of the iron plate 2 located axially outward with respect to the axial end of the magnet 3. When the balance weight portion 23, which extends outward in the direction and overlaps with the magnet 3, is formed integrally with the magnet 3, the balance weight 5 does not have to be formed as a separate member, and the number of parts can be reduced accordingly. is there.

[0014]

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 FIGS. 1 and 2 has a cylindrical laminated iron plate core 1 in which a plurality of circular iron plates 2 each having a through hole 21 through which a drive shaft is inserted are laminated in the central portion.
In addition to the above, four magnets 3 each having a partial arc shape along the outer peripheral surface of the laminated iron plate core 1 are arranged on the outer periphery of the laminated iron plate core 1 to cover almost the entire outer periphery of the laminated iron plate core 1. ,
A non-magnetic material is interposed between the magnets 3. Then, the non-magnetic metal pipe 4 is press-fitted to the outer circumference of each magnet 3 and the magnet 3 is fixed by the non-magnetic metal pipe 4 and the laminated iron plate iron core 1.

In the permanent magnet type rotor described above, however, a plurality of caulking protrusions 22 are formed at the radial intermediate positions of the iron plates 2 to form a plurality of caulking projections 22, and the iron plates 2 are laminated. The caulking projections 22 are sometimes engaged as shown in FIG. 3 to stack and fix the iron plates 2 to form the laminated iron plate core 1, and further, the end portions of the iron plates 2 at both ends in the laminating direction. Iron plates 2a, 2a
Is formed so that its outer diameter is substantially the same as the inner diameter of the non-magnetic metal pipe 4, and the end iron plates 2a, 2a are fixed to the end of the non-magnetic metal pipe 4 by fixing means by press fitting. The magnets 3 are hermetically fixed by the end iron plates 2a, 2a, the non-magnetic metal pipe 4, and the laminated iron plate iron core 1. By doing so, since the laminated iron plate iron core 1 and the magnet 3 are integrally fixed, they can be easily fixed without the need for a separate member such as a clamp pin, and moreover, by the end iron plates 2a, 2a. It is also possible to prevent the fallen powder due to the loss of the magnet 3 from scattering outside the rotor.

The end portions of the non-magnetic metal pipe 4 are formed by press-fitting the end iron plates 2a, 2a of the laminated iron plate iron core 1 and then bending the end iron plates 2a, 2a inward so that the non-magnetic metal parts of the end iron plates 2a, 2a. The fixation to the metal pipe 4 can be performed more reliably.

When the balance weight is attached to the permanent magnet type rotor, a plurality of semi-arcuate thin plates 51 as shown in FIGS. 4 and 5 are laminated on the outer surfaces of the end iron plates 2a, 2a. The balance weight 5 is formed by attaching each of the thin plates 51.
A second caulking protrusion 52 for fixing a balance weight, which engages with a first caulking protrusion 22 for fixing an iron core provided on the end iron plate 2a, is formed, and the balance weight 5 is attached to the second caulking protrusion 52 of the second It is fixed to the end iron plate 2a by engaging with the first caulking protrusion 22. By doing so, the balance weight 5 can also be easily attached by engaging the second caulking projection 52 with the first caulking projection 22.

At this time, the non-magnetic metal pipe 4 is formed with an extension portion 41 projecting from the stacking height of the balance weight 5 as shown in FIG. 6, so that the balance weight 5 receives centrifugal force. This non-magnetic metal pipe 4
Can be protected by. In addition, as shown in FIG. 7, by bending the end of the extension portion 41 of the non-magnetic metal pipe 4 inward, the balance weight 5 is not limited to the second caulking protrusion 52, but also the non-magnetic metal pipe. Since it can also be fixed by means of 4, the balance weight 5 can be surely fixed.

As another embodiment of attaching the balance weight to the end iron plates 2a, 2a of the permanent magnet type rotor, as shown in FIGS. 8 and 9, the shape of the thin plate 51 of the balance weight 5 is shown. May be formed by a semi-circular balance weight portion 51a and a frame-shaped holding portion 51b which is continuous with the balance weight portion 51a and extends along the inner peripheral surface of the non-magnetic metal pipe 4. In particular, as shown in FIG. 10, the length of the non-magnetic metal pipe 4 is projected from the stacking height of the balance weight 5 to form the extension portion 41, so that the entire outer peripheral surface of the balance weight 5 is covered with the non-magnetic material. Since it can be press-fitted into the metal pipe 4, the balance weight 5 can be securely fixed,
Further, as shown in FIG. 11, the end portion of the extension portion 41 of the non-magnetic metal pipe 4 can be bent inward to further secure the fixation.

By the way, in each of the above-described embodiments, the balance weight 5 is attached to the outside of the end iron plate 2a, but as shown in FIGS. 12 to 13 and 14 to 15, the end iron plate 2a is formed. And the end surface of the magnet 3 may be arranged. First, the one shown in FIGS.
The length of the laminated iron plate core 1 in the laminating direction is made longer than the axial length of the magnet 3, and an annular portion is provided between the axial end of the magnet 3 and the end iron plate 2a fixed to the nonmagnetic metal pipe 4. A cavity 6 is formed, and a balance weight 5 made of a non-magnetic material having a large specific gravity is provided in a half circumference of the annular cavity 6, and the balance weight 5 is prevented from moving in the other half circumference in the circumferential direction. For this purpose, a filling member 7 made of a non-magnetic material having a small specific gravity is internally provided, and the balance weight 5 and the filling member 7 are pressed against the axial end portion of the magnet 3 by fixing the end iron plate 2a. Fix it. By doing so, the balance weight 5 is attached to the magnet 3
Since it can be clamped and fixed by and the end iron plate 2a,
Even if the balance weight 5 is not provided with a fixing means, it can be attached simply by fixing the end iron plate 2a to the non-magnetic metal pipe 4, and the balance weight 5 can be protected by the end iron plate 2a. is there.

The embodiment shown in FIGS. 14 to 15 is
The height of the laminated iron plate core 1 in the laminating direction is made longer than the axial length of the magnet 3, and the iron plate 2 located axially outward with respect to the axial end of the magnet 3 extends radially outward. , A partial arc-shaped balance weight portion 2 overlapping with the magnet 3
Since the balance weight 5 can be formed by the iron plate 2 protruding from the magnet 3, the balance weight 5 does not need to be formed as a separate member, and the number of parts can be reduced accordingly. is there. The semi-arcuate space formed between the end iron plate 2a and the end surface of the magnet 3 is filled with a member having a small specific gravity as in the embodiment shown in FIGS. The member 7 may be filled or may not be filled.

Further, when the balance weight 5 is attached to the outside of the end iron plate 2a, as shown in FIG. 16, an axial through hole 11 is formed in the laminated iron plate core 1 and the balance weight 5 is formed. And the end iron plate 2
The laminated iron plate core 1 has a through hole 53 formed in a at a position smaller than the through hole 11 and corresponding to the through hole 11.
The caulking pin 8 may be inserted into the through hole 11 of the end plate 2a so as to project from the end iron plate 2a, and the through hole 53 of the balance weight 5 may be fitted into the projecting caulking pin 8 to be caulked and fixed.

[0023]

As described above, according to the present invention, a plurality of caulking projections 22 are formed on each of the iron plates 2 and each of the iron plates 2 is formed.
Of the iron plate 2 at both ends in the stacking direction of the iron plate 2 while the caulking projections 22 are engaged and fixed when the iron plate 2 is stacked.
The outer diameters of a and 2a are set to be substantially the same as the inner diameter of the pipe 4, and the end iron plates 2a and 2a are fixed to the ends of the pipe 4 by a fixing means, and the pipe 4 and the laminated iron plate iron core 1 Since the magnet 3 and the magnet 3 are integrated, the laminated iron plate iron core 1 and the magnet 3 can be fixed easily without the need for a separate member such as a clamp pin.

In addition, each of the thin plates 51 of the balance weight 5 formed by laminating a plurality of thin plates 51 is fitted with a first crimping projection 22 for fixing the iron core provided on the end iron plate 2a, and a second balancing weight fixing member. By forming the caulking protrusion 52, the balance weight 5 is moved to the end iron plate 2a by engaging the second caulking protrusion 52 with the first caulking protrusion 22.
The balance weight 5 can also be easily attached by engaging the second caulking protrusion 52 with the first caulking protrusion 22 when fixed to.

Moreover, when the balance weight mounting side end of the non-magnetic metal pipe 4 is provided with the extension portion 41 projecting from the stacking height of the balance weight 5, even if the balance weight 5 receives a centrifugal force, this It can be protected by the magnetic metal pipe 4.

Further, the length of the laminated iron plate iron core 1 in the laminating direction is made longer than the axial length of the magnet 3, and the end iron plate 2a fixed to the axial end of the magnet 3 and the nonmagnetic metal pipe 4. An annular space 6 is formed between the balance weight 5 and the balance weight 5, and the balance weight 5 is fixed to the annular space 6 by pressing the end iron plate 2a against the axial end of the magnet 3. 5 can be sandwiched and fixed by the magnet 3 and the end iron plate 2a, so that the end iron plate 2a can be simply fixed to the non-magnetic metal pipe 4 without providing fixing means on the balance weight 5. And the balance weight 5 is attached to the end iron plate 2
It can be protected by a.

Further, the height of the laminated iron plate iron core 1 in the laminating direction is made longer than the axial length of the magnet 3, and the diameter of the iron plate 2 located axially outward with respect to the axial end of the magnet 3. When the balance weight portion 23, which extends outward in the direction and overlaps with the magnet 3, is formed integrally with the magnet 3, the balance weight 5 does not have to be formed as a separate member, and the number of parts can be reduced accordingly. is there.

[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 partial cross-sectional view of the permanent magnet rotor of FIG.

FIG. 3 is an explanatory view showing a laminated state of iron plates constituting the permanent magnet type rotor of the present invention.

FIG. 4 is a top view showing an embodiment in which a balance weight is attached to the permanent magnet type rotor of the present invention.

5 is a partially cutaway vertical sectional view of the permanent magnet rotor of FIG.

6 is a partially cutaway sectional view showing another embodiment of the permanent magnet type rotor of FIG.

FIG. 7 is a partially cutaway sectional view showing another embodiment of the permanent magnet type rotor of FIG.

FIG. 8 is a top view showing another embodiment in which a balance weight is attached to the permanent magnet type rotor of the present invention.

FIG. 9 is a partially cutaway vertical sectional view of the permanent magnet rotor of FIG.

10 is a partially cutaway sectional view showing another embodiment of the permanent magnet type rotor of FIG.

FIG. 11 is a partially cutaway sectional view showing another embodiment of the permanent magnet type rotor of FIG. 9.

FIG. 12 is a top view showing an embodiment in which a balance weight is incorporated in the permanent magnet rotor of the present invention.

13 is a partially cutaway vertical sectional view of the permanent magnet rotor of FIG.

FIG. 14 is a top view showing another embodiment in which the balance weight is incorporated in the permanent magnet rotor of the present invention.

15 is a partially cutaway vertical sectional view of the permanent magnet rotor of FIG.

FIG. 16 is a partially cutaway vertical sectional view showing another embodiment in which a balance weight is attached to the permanent magnet type rotor of the present invention.

FIG. 17 is a vertical sectional view showing a conventional example.

FIG. 18 is a cross-sectional view of the conventional example of FIG.

[Explanation of symbols]

 1 Laminated Iron Plate Iron Core 2 Iron Plate 2a End Iron Plate 22 Caulking Protrusion (1st Caulking Protrusion) 23 Balance Weight Part 3 Magnet 4 Nonmagnetic Metal Pipe 41 Extension 5 Balance Weight 51 Thin Plate 52 Second Caulking Protrusion 6 Annular Space

Claims (5)

[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 in which a non-magnetic metal pipe 4 is press-fitted onto the outer circumference of each magnet 3 and a plurality of caulking projections 22 are formed on each iron plate 2. When the above-mentioned caulking projections 22 are engaged and fixed at the time of stacking,
End iron plates 2a, 2 at both ends of the iron plate 2 in the stacking direction
The outer diameter of a is set to be substantially the same as the inner diameter of the pipe 4, and the end iron plates 2a, 2a are fixed to the end of the pipe 4 by fixing means, and the pipe 4, the laminated iron plate iron core 1 and the magnet are fixed. 3. A permanent magnet type rotor characterized by being integrated with 3. 2. A balance weight fixing second member for engaging a first crimping protrusion 22 for fixing an iron core provided on an end iron plate 2a, on each thin plate 51 of a balance weight 5 formed by laminating a plurality of thin plates 51. By forming the caulking protrusions 52, the balance weight 5 is attached to the first caulking protrusions 52 of the second caulking protrusions 52.
The permanent magnet rotor according to claim 1, wherein the permanent magnet type rotor is fixed to the end iron plate 2a by engaging with the crimping protrusions 22. 3. The permanent magnet rotor according to claim 2, wherein an extension portion 41 projecting from the stacking height of the balance weight 5 is provided at the end portion of the non-magnetic metal pipe 4 on which the balance weight is attached. 4. The length of the laminated iron plate core 1 in the laminating direction is set to the magnet 3
Is formed longer than the axial length of the magnet 3, and an annular space 6 is formed between the axial end of the magnet 3 and the end iron plate 2a fixed to the nonmagnetic metal pipe 4, and the annular space 6 is balanced. The permanent magnet rotor according to claim 1, wherein the weight 5 is fixed by pressing the end iron plate 2a against the axial end of the magnet 3. 5. The height of the laminated iron plate core 1 in the laminating direction is set to the magnet 3
Is made longer than the axial length of the magnet 3, extends radially outward to the iron plate 2 positioned axially outward with respect to the axial end portion of the magnet 3, and overlaps with the magnet 3 in a partially arcuate balance weight. The permanent magnet rotor according to claim 1, wherein the portion 23 is integrally formed.