A segmented annular permanent magnet variable skew pole permanent magnet motor rotor

Abstract

This utility model relates to a segmented annular permanent magnet variable skew pole permanent magnet motor rotor, belonging to the technical field of permanent magnet motor rotors. The rotor includes a shaft, segmented magnetic rings, magnetic shielding sheets, and retaining rings. The magnetic shielding sheets and segmented magnetic rings are alternately fitted onto the shaft, with a retaining ring for fixing on the outermost magnetic shielding sheet. Positioning protrusions are symmetrically arranged on both sides of the segmented magnetic rings, and slots are provided on the magnetic shielding sheets. The segmented magnetic rings are relatively fixed to the magnetic shielding sheets through the positioning protrusions and slots. This utility model has a simple and efficient structure, using segmented magnetic rings instead of traditional segmented tile-type magnets. The segmented magnetic rings are an integrated structure, ensuring assembly accuracy and improving assembly efficiency. Furthermore, the cooperation of the positioning protrusions and slots enables rapid assembly of segmented continuous skew pole structures and segmented V-shaped skew pole structures, improving production efficiency.

Description

Technical Field

[0001] This utility model relates to a segmented annular permanent magnet variable skew pole permanent magnet motor rotor, belonging to the field of permanent magnet motor rotor technology. Background Technology

[0002] A permanent magnet motor is an electric motor that converts mechanical energy into electrical energy through the interaction between the magnetic field generated by a permanent magnet and an electric current. Permanent magnet motors typically use permanent magnets (such as ferrite or neodymium iron boron) as the magnetic field source, eliminating the need for consumable mechanical components like brushes and slip rings. This improves system reliability and reduces motor maintenance costs, representing a major trend in current motor development.

[0003] The arrangement of permanent magnets can significantly alter the performance of a motor. Most existing permanent magnet motor rotors use a direct-pole structure, such as... Figure 1 As shown, permanent magnets are evenly distributed on the rotor, parallel to the shaft. Some motors employ a skewed pole structure to optimize performance. The skewed pole design disperses cogging effect, reduces torque ripple, and makes the motor run more smoothly. By reducing magnetic field inhomogeneity in the motor, torque pulsation is reduced, improving the smoothness and continuity of the motor's output torque. Torque pulsation and cogging torque can cause mechanical vibration and noise; the skewed pole structure can significantly reduce these adverse effects, especially noticeable at low speeds. The skewed pole design also helps permanent magnet motors start more smoothly, avoiding the "jerk" phenomenon caused by cogging effect. Commonly used skewed pole structures in the market include... Figure 2 As shown, there are continuous slant pole structures and V-shaped slant pole structures. During use, the following problems were found in the current slant pole structures:

[0004] 1. Difficult processing: For continuous skewed pole structures, permanent magnets need to be processed into structures with axial tilt and radial arcs, which increases the complexity of manufacturing and processing. Especially for high-precision motors, sintered NdFeB permanent magnets are produced through machining. The outer diameter of the motor rotor and the pole arc coefficient will affect the processing difficulty and yield of tile-type magnets. Defects such as cracks and broken corners may occur during the production process.

[0005] 2. Complex installation: The surface-mount permanent magnets using sintered NdFeB have only one pair of poles per magnet. The more pole pairs the motor design has, the more skewed pole segments there are, and the more permanent magnets are installed. It is difficult to ensure uniformity in the installation accuracy of each permanent magnet. The trend towards miniaturization of motors further increases this difficulty. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a segmented annular permanent magnet variable skew pole permanent magnet motor rotor, overcoming the problems of difficult rotor processing and complex assembly in existing technologies.

[0007] The technical solution of this utility model is as follows:

[0008] A segmented annular permanent magnet variable skew pole permanent magnet motor rotor includes a rotating shaft, segmented magnetic rings, magnetic shielding sheets, and retaining rings, wherein the magnetic shielding sheets and segmented magnetic rings are alternately fitted on the rotating shaft, and a retaining ring is provided on the outermost magnetic shielding sheet side for fixing.

[0009] The segmented magnetic ring has symmetrical positioning protrusions on both sides, and the magnetic shielding sheet has a slot. The segmented magnetic ring is fixed to the magnetic shielding sheet through the positioning protrusions and the slot.

[0010] According to the preferred embodiment of this utility model, the positioning protrusion is an arc-shaped block with an arc of θ1 and the included angle of the slot is θ2, where θ2 = 2 × θ1, ensuring that the slot can stably clamp the two positioning protrusions.

[0011] According to a preferred embodiment of the present invention, the segmented magnetic ring uses neodymium iron boron magnets, the magnets are radially magnetized, the radial magnetic field strength waveform is a saddle waveform, and the magnets alternately form N poles and S poles in the circumferential direction.

[0012] According to the preferred embodiment of this utility model, when assembling the segmented continuous inclined pole structure, the positioning protrusions of each segmented magnetic ring are offset in the same direction.

[0013] According to a preferred embodiment of this utility model, when assembling the segmented V-shaped slanted pole structure, the even-numbered segmented magnetic rings are offset in the same direction, forming a V-shaped arrangement with the odd-numbered segmented magnetic rings.

[0014] According to a preferred embodiment of the present invention, the rotating shaft is a stepped shaft, which is used to axially position the assembled segmented magnetic ring. The rotating shaft and the segmented magnetic ring are in clearance fit, which facilitates the application of industrial adhesive for fixing and torque transmission.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model has a simple and efficient structure. It uses segmented magnetic rings instead of traditional segmented tile-type magnets. The segmented magnetic rings are an integrated structure, which ensures assembly accuracy and improves assembly efficiency. Moreover, by cooperating with the positioning protrusions and slots, it is possible to quickly assemble segmented continuous slanted pole structures and segmented V-shaped slanted pole structures, thereby improving production efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram of an existing permanent magnet motor rotor structure;

[0018] Figure 2 This is a schematic diagram of an existing slanted pole structure, in which, Figure 2 (a) is a schematic diagram of a segmented continuous skew pole structure. Figure 2 (b) is a schematic diagram of a segmented V-shaped slanted pole structure;

[0019] Figure 3 This is an exploded view of the present invention;

[0020] Figure 4 This is a schematic diagram of the segmented magnetic ring three-dimensional structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the side structure of the segmented magnetic ring of this utility model;

[0022] Figure 6 This is a schematic diagram of the magnetic shielding sheet structure of this utility model;

[0023] Figure 7 This is a schematic diagram of the assembly of the segmented continuous skew pole structure of this utility model;

[0024] Figure 8 This is a schematic diagram of the assembly of the segmented V-shaped inclined pole structure of this utility model;

[0025] The components include: 1. segmented magnetic ring; 2. magnetic shielding sheet; 3. snap ring; 4. rotating shaft; 5. positioning protrusion; and 6. slot. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0027] Example 1:

[0028] like Figure 3-8 As shown, this embodiment provides a segmented annular permanent magnet variable skew pole permanent magnet motor rotor, including a rotating shaft 4, segmented magnetic rings 1, magnetic shielding sheets 2 and retaining rings 3, wherein the magnetic shielding sheets 2 and segmented magnetic rings 1 are alternately mounted on the rotating shaft 4, and a retaining ring 3 for fixing is provided on one side of the outermost magnetic shielding sheet 2.

[0029] The segmented magnetic ring 1 has symmetrical positioning protrusions 5 on both sides, and the magnetic shielding sheet 2 has a slot 6. The segmented magnetic ring 1 is relatively fixed to the magnetic shielding sheet through the positioning protrusions and the slot.

[0030] The positioning protrusion 5 is an arc-shaped block with an arc of θ1 and a slot angle of θ2, where θ2 = 2 × θ1, ensuring that the slot can stably hold the two positioning protrusions.

[0031] The segmented magnetic ring 1 uses neodymium iron boron magnets. The magnets are radially magnetized, and the radial magnetic field strength waveform is a saddle waveform. The magnets alternately form N poles and S poles in the circumference.

[0032] When assembling the segmented continuous skewed pole structure, the positioning protrusions of each segmented magnetic ring 1 are offset in the same direction, such as... Figure 7 As shown.

[0033] When assembling the segmented V-shaped skewed pole structure, the even-numbered segmented magnetic rings are offset in the same direction, forming a V-shaped arrangement with the odd-numbered segmented magnetic rings, such as... Figure 8 As shown.

[0034] The rotating shaft 4 is a stepped shaft, used for axial positioning of the assembled segmented magnetic ring. The rotating shaft 4 and the segmented magnetic ring 1 are clearance fit, which facilitates the application of industrial adhesive for fixing and torque transmission.

[0035] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A segmented ring permanent magnet variable skew pole permanent magnet machine rotor, characterized by, It includes a rotating shaft, segmented magnetic rings, magnetic shielding sheets, and retaining rings. The magnetic shielding sheets and segmented magnetic rings are alternately fitted on the rotating shaft, and a retaining ring is provided on the outermost side of the magnetic shielding sheet for fixing. The segmented magnetic ring has symmetrical positioning protrusions on both sides, and the magnetic shielding sheet has a slot. The segmented magnetic ring is fixed to the magnetic shielding sheet through the positioning protrusions and the slot.

2. The segmented ring permanent magnet variable-slope pole PM machine rotor of claim 1, wherein, The positioning protrusion is an arc-shaped block with an arc of θ1 and a slot angle of θ2, where θ2 = 2 × θ1.

3. The segmented ring permanent magnet variable-slope pole PM machine rotor of claim 1, wherein, The segmented magnetic ring uses neodymium iron boron magnets, which are radially magnetized. The radial magnetic field strength waveform is a saddle waveform, and the magnets alternately form N and S poles in the circumferential direction.

4. The segmented ring permanent magnet variable-slope pole PM machine rotor of claim 1, wherein, When assembling the segmented continuous skew pole structure, the positioning protrusions of each segmented magnetic ring are offset in the same direction.

5. The segmented ring permanent magnet variable-slope pole PM machine rotor of claim 1, wherein, When assembling the segmented V-shaped skew pole structure, the even-numbered segmented magnetic rings are offset in the same direction, forming a V-shaped arrangement with the odd-numbered segmented magnetic rings.

6. The segmented ring permanent magnet variable-slope pole PM machine rotor of claim 1, wherein, The rotating shaft is a stepped shaft, used for axial positioning of the assembled segmented magnetic rings. The rotating shaft and the segmented magnetic rings are in clearance fit.

Images