Lightweight surface-mounted permanent magnet motor rotor and magnetic conductive filling body for magnetizing thereof

Abstract

The utility model discloses a lightweight surface-mounted permanent magnet motor rotor, which comprises an iron core, a plurality of permanent magnet blocks and a sheath, the iron core is fixed on the periphery of a motor shaft, the permanent magnet blocks are axially attached to the cylindrical peripheral surface of the iron core, and the sheath is sleeved outside all the permanent magnet blocks to limit the permanent magnet blocks on the peripheral surface of the iron core. A plurality of axial weight-reducing through holes for reducing the weight of the iron core are formed between the peripheral surface of the iron core and the motor shaft, and the apertures of the axial weight-reducing through holes are equal everywhere. The utility model also discloses a magnetizing magnetic filling body for the permanent magnet motor rotor, which comprises magnetic filling blocks with the same number as the axial weight-reducing through holes, and the magnetic filling blocks can be inserted into the axial weight-reducing through holes. The magnetic conducting filling body further comprises an end plate, one end of each magnetic conducting filling block is fixed on the end plate, and the arrangement of each magnetic conducting filling block corresponds to the arrangement of each axial weight reduction through hole in the iron core. The permanent magnet motor rotor has the advantages that the contradiction between light weight of the permanent magnet motor rotor and difficulty in realizing saturated magnetization is well solved; and the magnetic filling body can be conveniently and quickly mounted and dismounted.

Description

Technical Field

[0001] The utility model relates to a lightweight surface-mounted permanent magnet motor rotor and a magnetic conduction filler for magnetization, belonging to the technical field of motor magnetization. Background Art

[0002] Permanent magnet motors have the characteristics of energy saving, high efficiency and small volume, and are widely used in many fields.

[0003] The rotor of a permanent magnet motor includes a cylindrical iron core located on the outer periphery of the motor shaft and coaxial with the motor shaft, a plurality of permanent magnet blocks axially attached to the outer peripheral surface of the iron core, and an annular sheath sleeved outside all the permanent magnet blocks.

[0004] In the past, the manufacturing process route of the rotor of a permanent magnet motor was to magnetize a single permanent magnet block first and then install them one by one. This method is prone to problems such as magnetic steel attraction and wrong pole installation, with low efficiency, and is also prone to losses and low qualification rate during the installation process. To overcome the above defects, in the mass production after the product is finalized, the overall magnetization process plan of the rotor is currently more and more inclined to be adopted to improve production efficiency and quality. That is, first attach non-magnetic permanent magnet blocks to the outer peripheral surface of the iron core, then fix them with a sheath, and then magnetize the permanent magnet blocks through a magnetization coil on the outer periphery of the sheath to make the permanent magnet blocks have permanent magnetism.

[0005] In the rotor of a permanent magnet motor, especially in the rotor of a medium and large-sized motor, due to the large diameter and very large weight of the iron core, people often reduce the weight by means of opening holes or slots to achieve the lightweight of the entire motor as much as possible. However, for the iron core of the rotor processed by weight reduction, when magnetizing the permanent magnet blocks, serious magnetic resistance will be generated in the hollow areas of the holes or slots, resulting in insufficient magnetic field strength and uneven magnetic field distribution, making it difficult to magnetize the permanent magnet blocks to saturation, resulting in unqualified products, increasing magnetization energy consumption and delaying magnetization time. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is: how to solve the contradiction between the lightweight of the rotor of a permanent magnet motor and the difficulty in achieving saturation magnetization.

[0007] In view of the above problems, the technical solution proposed by the utility model is:

[0008] A lightweight surface-mounted permanent magnet motor rotor, including an iron core, a plurality of permanent magnet blocks and a sheath, the iron core is fixed on the outer periphery of the motor shaft, the permanent magnet blocks are axially attached to the cylindrical outer peripheral surface of the iron core, the sheath is annular and sleeved outside all the permanent magnet blocks to limit the permanent magnet blocks on the outer peripheral surface of the iron core, and a plurality of axial weight reduction through holes for reducing the weight of the iron core are provided between the outer peripheral surface of the iron core and the motor shaft, and the apertures of the axial weight reduction through holes are equal everywhere.

[0009] The iron core is composed of an outer ring body and a plurality of supporting radial plates. One side surface of each supporting radial plate is directly fixed on the outer peripheral surface of the motor shaft, and the other side is fixed on the inner wall of the outer ring body. The axial weight-reducing through hole is a fan-shaped hole formed by the inner wall of the outer ring body, the outer peripheral surface of the motor shaft, and two supporting radial plates.

[0010] The iron core is composed of an outer ring body, an inner ring body, and a plurality of supporting radial plates. One side surface of each supporting radial plate is fixed on the outer peripheral surface of the inner ring body, and the other side is fixed on the inner wall of the outer ring body. The axial weight-reducing through hole is a fan-shaped hole formed by the inner wall of the outer ring body, the outer peripheral surface of the inner ring body, and two supporting radial plates.

[0011] A magnetic conduction filling body for magnetizing the permanent magnet motor rotor described above, including magnetic conduction filling blocks equal in number to the axial weight-reducing through holes, and the magnetic conduction filling blocks can be inserted into the axial weight-reducing through holes.

[0012] The magnetic conduction filling body for magnetizing described above further includes an end plate. One end of each magnetic conduction filling block is fixed on the end plate, and the arrangement of each magnetic conduction filling block corresponds to each axial weight-reducing through hole on the iron core.

[0013] The magnetic conduction filling body for magnetizing described above further includes a cage. The cage includes an outer sleeve ring and a plurality of spacing radial plates. The inner diameter of the outer sleeve ring is equal to the inner diameter of the outer ring body. The outer ends of the spacing radial plates are fixed on the inner wall of the outer sleeve ring. The inner wall of the outer sleeve ring and two spacing radial plates form a limiting sliding groove that can insert the magnetic conduction filling blocks and perform circumferential and radial limiting on the magnetic conduction filling blocks. The cage can slide on the magnetic conduction filling body.

[0014] The radial length of the spacing radial plate is equal to or less than the spacing between the outer peripheral surface of the motor shaft and the inner wall of the outer sleeve ring.

[0015] A shaft hole for the motor shaft to pass through is provided at the center of the end plate.

[0016] A handle for pulling the magnetic conduction filling body out of the iron core is provided on the back surface of the end plate.

[0017] Another magnetic conduction filling body for magnetizing the permanent magnet motor rotor described above, including magnetic conduction filling blocks, an end plate, and a cage. One end of each magnetic conduction filling block is fixed on the end plate, the number is equal to and the positions correspond to the number of axial weight-reducing through holes. Each magnetic conduction filling block can be inserted into the corresponding axial weight-reducing through hole. The cage includes an outer sleeve ring, an inner sleeve ring, and a plurality of spacing radial plates. The inner diameter of the outer sleeve ring is equal to the inner diameter of the outer ring body. The outer diameter of the inner sleeve ring is equal to the outer diameter of the inner ring body. The outer ends of the spacing radial plates are fixed on the inner wall of the outer sleeve ring, and the inner ends are fixed on the outer periphery of the inner sleeve ring. The inner wall of the outer sleeve ring, the inner sleeve ring, and two spacing radial plates form a limiting sliding hole that can insert the magnetic conduction filling blocks and perform circumferential and radial limiting on the magnetic conduction filling blocks. The cage can slide on the magnetic conduction filling body. Beneficial effects

[0018] 1. The setting form of the axial weight-reducing through holes of the iron core involved in this application facilitates inserting magnetic conduction filling blocks with a cross-sectional area slightly smaller than that of the axial weight-reducing through holes and uniform size into the axial weight-reducing through holes, so that there is only a very small gap and the gap is uniform between the magnetic conduction filling blocks in the axial weight-reducing through holes, and a uniform and stable magnetic field can be formed when magnetizing the permanent magnet blocks, which well solves the contradiction between the lightweight of the permanent magnet motor rotor and the difficulty in achieving saturation magnetization.

[0019] 2. It can conveniently and quickly install and disassemble the magnetic conduction filling body. Description of the Drawings

[0020] Figure 1 Schematic perspective view of the lightweight surface-mounted permanent magnet motor rotor described in Embodiment 1;

[0021] Figure 2 Schematic cross-sectional view of the lightweight surface-mounted permanent magnet motor rotor described in Embodiment 1;

[0022] Figure 3 Schematic perspective view of the lightweight surface-mounted permanent magnet motor rotor described in Embodiment 2, in which the iron core is shown to have an inner ring body;

[0023] Figure 4 [[ID=The 23]]Schematic perspective view of the magnetic conduction filling body and the cage disassembled described in Embodiment 3;

[0024] Figure 5 Schematic perspective view of the magnetic conduction filling body sleeved on the cage described in Embodiment 3;

[0025] Figure 6 Schematic perspective view of the magnetic conduction filling body sleeved on the cage described in Embodiment 3, mainly showing the back of the end plate in the figure;

[0026] Figure 7 Schematic perspective view of the magnetic conduction filling body and the cage disassembled described in Embodiment 4.

[0027] In the figure: 1. Motor shaft; 2. Iron core; 21. Outer ring body; 22. Inner ring body; 23. Support web; 24. Axial weight-reducing through hole; 3. Permanent magnet block; 4. Sheath; 5. Magnetic conduction filling body; 51. End plate; 511. Shaft hole; 512. Handle; 52. Magnetic conduction filling block; 6. Cage; 61. Outer sleeve ring; 62. Inner sleeve ring; 63. Spacing web; 64. Limit chute; 65. Limit slide hole. Detailed Description of the Invention Embodiment 1

[0028] As Figure 1 , 2As shown in the figure, a lightweight surface-mounted permanent magnet motor rotor includes an iron core 2, a plurality of permanent magnet blocks 3, and a sheath 4. The iron core 2 is fixed on the outer periphery of the motor shaft 1. The permanent magnet blocks 3 are axially attached to the cylindrical outer peripheral surface of the iron core 2. The sheath 4 is annular and sleeved outside all the permanent magnet blocks 3 to limit the permanent magnet blocks 3 on the outer peripheral surface of the iron core 2. A plurality of axial weight reduction through holes 24 for reducing the weight of the iron core 2 are provided between the outer peripheral surface of the iron core 2 and the motor shaft 1, and the apertures of the axial weight reduction through holes 24 are equal everywhere. In this way, when magnetizing the permanent magnet blocks 3, it is convenient to insert a magnetic conduction filling block 52 with a cross-sectional area slightly smaller than that of the axial weight reduction through hole 24 and with a uniform size into the axial weight reduction through hole 24, so that there is only a very small gap and the gap is uniform in the axial weight reduction through hole 24, and a uniform magnetic field can be formed when magnetizing the permanent magnet blocks 3.

[0029] The iron core 2 is composed of an outer ring body 21 and a plurality of support webs 23. One side surface of the support web 23 is directly fixed on the outer peripheral surface of the motor shaft 1, and the other side is fixed on the inner wall of the outer ring body 21. The axial weight reduction through hole 24 is a fan-shaped hole surrounded by the inner wall of the outer ring body 21, the outer peripheral surface of the motor shaft 1, and two support webs 23. Embodiment 2

[0030] As Figure 3 shown, the difference from Embodiment 1 is that the iron core 2 is composed of an outer ring body 21, an inner ring body 22, and a plurality of support webs 23. One side surface of the support web 23 is fixed on the outer peripheral surface of the inner ring body 22, and the other side is fixed on the inner wall of the outer ring body 21. The axial weight reduction through hole 24 is a fan-shaped hole surrounded by the inner wall of the outer ring body 21, the outer peripheral surface of the inner ring body 22, and two support webs 23. The advantage of this embodiment is that when the iron core 2 is assembled with the motor shaft 1, the motor shaft 1 can be inserted into the inner hole of the inner ring body 22 and then fixed by pins or welding. Embodiment 3

[0031] As Figure 1 、 4 —6 shows a magnetic conduction filling body for magnetizing the permanent magnet motor rotor described in Embodiment 1, which includes magnetic conduction filling blocks 52 equal in number to the axial weight reduction through holes 24, and the magnetic conduction filling blocks 52 can be inserted into the axial weight reduction through holes 24. During magnetization, the magnetic resistance brought by the axial weight reduction through holes 24 opened for the lightweight of the mandrel can be eliminated, so that the permanent magnet blocks 3 can be saturatedly magnetized in a uniform and stable magnetic field. After magnetization is completed, the magnetic conduction filling blocks 52 are taken out. In this way, the contradiction between the lightweight of the permanent magnet motor rotor and the difficulty in achieving saturated magnetization is solved.

[0032] The above magnetic conductive filler also includes an end plate 51. One end of each magnetic conductive filling block 52 is fixed on the end plate 51, and the arrangement of each magnetic conductive filling block 52 corresponds to each axial weight reduction through hole 24 on the iron core 2. In this way, all the magnetic conductive filling blocks 52 can be inserted into all the axial weight reduction through holes 24 of the iron core 2 at one time.

[0033] The above magnetic conductive filler further includes a cage 6. The cage 6 includes an outer sleeve ring 61 and a plurality of spacing radial plates 63. The inner diameter of the outer sleeve ring 61 is equal to the inner diameter of the outer ring body 21. The outer ends of the spacing radial plates 63 are fixed to the inner wall of the outer sleeve ring 61. The inner wall of the outer sleeve ring 61 and the two spacing radial plates 63 enclose a limiting chute 64 that can insert the magnetic conductive filling block 52 and perform circumferential and radial limiting on the magnetic conductive filling block 52. The cage 6 can slide on the magnetic conductive filler 5. At the beginning of application, the cage 6 is located at the end of the magnetic conductive filler 5 away from the end plate 51, so that each magnetic conductive filling block 52 maintains a position corresponding to each axial weight reduction through hole 24 of the iron core, avoiding the end of each magnetic conductive filling block 52 away from the end plate 51 from sagging due to gravity and not corresponding to each axial weight reduction through hole 24, resulting in the end of each magnetic conductive filling block 52 away from the end plate 51 not being able to be smoothly inserted into the corresponding axial weight reduction through hole 24. During the process of inserting each magnetic conductive filling block 52 into the corresponding axial weight reduction through hole 24, the cage 6 is blocked by each component of the iron core 2 and gradually slides towards the end plate direction, so that each magnetic conductive filling block 52 can be smoothly inserted into each axial weight reduction through hole 24.

[0034] The radial length of the spacing radial plate 63 is equal to or less than the distance between the outer peripheral surface of the motor shaft 1 and the inner wall of the outer sleeve ring 61, leaving at least enough space for the motor shaft 1 to pass through the space surrounded by each magnetic conductive filling block 52.

[0035] A shaft hole 511 for the motor shaft 1 to pass through is provided in the center of the end plate 51. In this way, when the motor shaft 1 is too long, the entire magnetic conductive filler can be inserted into the axial weight reduction through hole 24 by inserting the motor shaft 1 at one end.

[0036] A handle 512 for smoothly pulling out the magnetic conductive filler 5 from the iron core 2 is provided on the back of the end plate 51. Embodiment 4

[0037] As Figure 3 、 7As shown, a magnetic conduction filler for magnetizing the permanent magnet motor rotor described in the second embodiment is different from that of the third embodiment in that it includes a magnetic conduction filling block 52, an end plate 51, and a cage 6. One end of the magnetic conduction filling block 52 is fixed on the end plate 51, and the number is equal to and the positions correspond to the number of axial weight reduction through holes 24. Each magnetic conduction filling block 52 can be inserted into the corresponding axial weight reduction through hole 24. The cage 6 includes an outer sleeve ring 61, an inner sleeve ring 62, and a plurality of spacing radial plates 63. The inner diameter of the outer sleeve ring 61 is equal to the inner diameter of the outer ring body 21, and the outer diameter of the inner sleeve ring 62 is equal to the outer diameter of the inner ring body 22. The outer ends of the spacing radial plates 63 are fixed to the inner wall of the outer sleeve ring 61, and the inner ends are fixed to the outer periphery of the inner sleeve ring 62. A limiting sliding hole 65 that can insert the magnetic conduction filling block 52 and perform circumferential and radial limiting on the magnetic conduction filling block 52 is formed by the inner wall of the outer sleeve ring 61, the inner sleeve ring 62, and two spacing radial plates 63. The cage 6 can slide on the magnetic conduction filler 5. The same functions and principles of the magnetic conduction filler 5 as those of the third embodiment will not be elaborated. The difference is that an inner sleeve ring 62 is provided on the cage corresponding to the inner ring body 22 of the iron core. The inner sleeve ring 62 can slide on the motor shaft, enabling the magnetic conduction filler 5 to smoothly slide close to the iron core and accurately align each magnetic conduction filling block far from the end plate 51 with its respective axial weight reduction through hole 24.

[0038] The above embodiments are only used to describe the present invention more clearly and should not be regarded as limiting the protection scope covered by the present invention. Any modification in an equivalent form should be regarded as falling within the protection scope covered by the present invention.

Claims

1. A lightweight surface-mounted permanent magnet motor rotor, comprising an iron core (2) and a plurality of permanent magnet blocks (3). The iron core (2) is fixed to the outer periphery of the motor shaft (1), and the permanent magnet blocks (3) are axially attached to the cylindrical outer peripheral surface of the iron core (2). A plurality of axial weight-reducing through holes (24) for reducing the weight of the iron core (2) are provided between the outer peripheral surface of the iron core (2) and the motor shaft (1). It is characterized in that: The aperture of the axial weight-reducing through hole (24) is equal everywhere.

2. The lightweight surface-mounted permanent magnet motor rotor according to claim 1, wherein: The iron core (2) is composed of an outer ring body (21) and a plurality of support webs (23). One side of the support web (23) is directly fixed to the outer peripheral surface of the motor shaft (1), and the other side is fixed to the inner wall of the outer ring body (21). The axial weight-reducing through hole (24) is a fan-shaped hole formed by the inner wall of the outer ring body (21), the outer peripheral surface of the motor shaft (1), and two support webs (23).

3. The lightweight surface-mounted permanent magnet motor rotor according to claim 1, wherein: The iron core (2) is composed of an outer ring body (21), an inner ring body (22), and a plurality of support webs (23). One side of the support web (23) is fixed to the outer peripheral surface of the inner ring body (22), and the other side is fixed to the inner wall of the outer ring body (21). The axial weight-reducing through hole (24) is a fan-shaped hole formed by the inner wall of the outer ring body (21), the outer peripheral surface of the inner ring body (22), and two support webs (23).

4. A magnetic conduction filler for magnetizing the permanent magnet motor rotor according to claim 2, characterized in that: It includes magnetic conduction filling blocks (52) equal in number to the axial weight-reducing through holes (24), and the magnetic conduction filling blocks (52) can be inserted into the axial weight-reducing through holes (24).

5. The magnetic conduction filler for magnetizing the permanent magnet motor rotor according to claim 4, wherein: It further includes an end plate (51). One end of each magnetic conduction filling block (52) is fixed to the end plate (51), and the arrangement of each magnetic conduction filling block (52) corresponds to each axial weight-reducing through hole (24) on the iron core (2).

6. The magnetic conduction filler for magnetizing the permanent magnet motor rotor according to claim 5, wherein: It further includes a cage (6). The cage (6) includes an outer sleeve ring (61) and a plurality of spacing webs (63). The inner diameter of the outer sleeve ring (61) is equal to the inner diameter of the outer ring body (21). The outer ends of the spacing webs (63) are fixed to the inner wall of the outer sleeve ring (61). The inner wall of the outer sleeve ring (61) and two spacing webs (63) enclose a limiting chute (64) capable of inserting the magnetic conduction filling blocks (52) and performing circumferential and radial limiting on the magnetic conduction filling blocks (52), and the cage (6) can slide on the magnetic conduction filling body (5).

7. The magnetic conduction filler for magnetizing the permanent magnet motor rotor according to claim 6, wherein: The radial length of the spacing web (63) is equal to or less than the spacing between the outer peripheral surface of the motor shaft (1) and the inner wall of the outer sleeve ring (61).

8. The magnetic conduction filler for magnetizing the permanent magnet motor rotor according to claim 5, characterized in that: A shaft hole (511) for the motor shaft (1) to pass through is provided in the center of the end plate (51).

9. The magnetic conduction filler for magnetizing the permanent magnet motor rotor according to claim 5, characterized in that: A handle (512) for pulling out the magnetic conduction filling body (5) from the iron core (2) is provided on the back surface of the end plate (51).

10. A magnetic conduction filler for magnetizing the permanent magnet motor rotor described in claim 3, characterized in that: It includes a magnetic conductive filling block (52), an end plate (51) and a cage (6). One end of the magnetic conductive filling block (52) is fixed on the end plate (51), and the quantity is equal to and the positions correspond to the quantity of the axial weight-reducing through holes (24). Each magnetic conductive filling block (52) can be inserted into the corresponding axial weight-reducing through hole (24). The cage (6) includes an outer sleeve ring (61), an inner sleeve ring (62) and a plurality of spacing radial plates (63). The inner diameter of the outer sleeve ring (61) is equal to the inner diameter of the outer ring body (21), the outer diameter of the inner sleeve ring (62) is equal to the outer diameter of the inner ring body (22), the outer ends of the spacing radial plates (63) are fixed on the inner wall of the outer sleeve ring (61), and the inner ends are fixed on the outer periphery of the inner sleeve ring (62). A limiting sliding hole (65) that can insert the magnetic conductive filling block (52) and perform circumferential and radial limiting on the magnetic conductive filling block (52) is formed by the inner wall of the outer sleeve ring (61), the inner sleeve ring (62) and two spacing radial plates (63). The cage (6) can slide on the magnetic conductive filling body (5).

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