Motor and its rotor assembly

Abstract

This invention relates to an electric motor and its rotor assembly. The rotor assembly includes a rotor core and a shaft passing through the rotor core and extending from both ends of the rotor core. The rotor core includes a columnar core body and a central through hole for the shaft to pass through. The core body and the shaft are integrated by filling with a colloid material and / or by covering the core body and the shaft with a colloid material. By forming an integrated structure between the core body and the shaft by filling with a colloid material and / or by covering with a colloid material, the rotor assembly can improve the shaft insulation performance, reduce the overall hysteresis loss of the rotor, improve motor performance, and avoid deformation of the core body caused by the shaft directly pressing against the rotor core. This also improves the concentricity after assembly, reduces overall motor vibration and noise, and improves the overall sealing and safety of the motor.

Description

Technical Field

[0001] This invention relates to electric motors, and more specifically, to an electric motor and its rotor assembly. Background Technology

[0002] In related technologies, the rotor assembly of the motor has a shaft that directly contacts the rotor core or avoids the shaft through an insulating sleeve, with the outer surface protected by a metal shell. Disadvantages: If the shaft directly contacts the rotor core, the metal shaft is prone to magnetism, and a portion of the magnetic field generated after energization passes directly through the shaft, increasing losses and reducing motor performance. Adding an insulating sleeve at the shaft-core location affects the overall concentricity of the rotor assembly due to multi-layer assembly during manufacturing, increasing motor noise. Using a metal shell for the outer surface results in poor overall sealing performance due to assembly issues, and poses safety hazards for high-voltage motors carrying metal conductors. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an improved rotor assembly, and further to provide an improved motor.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct a rotor assembly, including a rotor core and a rotating shaft passing through the rotor core and extending from both ends of the rotor core;

[0005] The rotor core includes a columnar core body and a central through hole through which the rotating shaft passes.

[0006] The iron core body and the rotating shaft are integrated into a single structure by filling with a colloidal material and / or by covering the iron core body and the rotating shaft with a colloidal material.

[0007] Preferably, the iron core body is provided with a plurality of filling channels communicating with the central through hole for filling with the colloidal material; the plurality of filling channels are arranged at intervals along the circumference of the central through hole.

[0008] Preferably, the filling channel includes a first channel extending longitudinally through the core body and a second channel connecting the first channel and the central through hole.

[0009] Preferably, the colloidal material covers the entire outer surface of the iron core body.

[0010] Preferably, the colloidal material located at both ends of the iron core body extends toward the shaft and covers a portion of the shaft to form an extension section;

[0011] The outer wall of the extension section is provided with a flat section.

[0012] Preferably, the rotor assembly further includes a plurality of magnets attached to the periphery of the rotor core.

[0013] Preferably, the outer periphery of the iron core body is provided with a plurality of limiting protrusions at intervals; the interval between two adjacent limiting protrusions forms an installation groove for installing the magnet.

[0014] Preferably, the rotor assembly further includes a plurality of magnets inserted longitudinally onto the rotor core;

[0015] The iron core body is provided with multiple insertion holes for the corresponding insertion of multiple magnets;

[0016] The plurality of said insertion holes are arranged at circumferential intervals along the central through hole;

[0017] The outer peripheral wall of the iron core body is provided with a plurality of filling grooves for filling the colloidal material;

[0018] The plurality of filling slots are arranged at circumferential intervals along the core body.

[0019] Preferably, the colloidal material is epoxy resin adhesive;

[0020] The core body comprises multiple silicon steel sheets; the multiple silicon steel sheets are stacked sequentially along the longitudinal direction.

[0021] The present invention also constructs an electric motor, including the rotor assembly described in the present invention and a stator assembly that cooperates with the rotor assembly.

[0022] The motor and its rotor assembly implementing the present invention have the following beneficial effects: the rotor assembly forms an integral structure by filling the iron core body and the shaft with a colloid material and / or by covering it with a colloid material, thereby improving the insulation performance of the shaft, reducing the overall hysteresis loss of the rotor, improving the motor performance, and avoiding the deformation of the iron core body caused by the shaft directly squeezing the rotor iron core, improving the concentricity after assembly, reducing the overall vibration and noise of the motor, and improving the overall sealing and safety of the motor. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0024] Figure 1 This is a cross-sectional view of the rotor assembly of the motor in the first embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the rotor core of the rotor assembly shown.

[0026] Figure 3 yes Figure 2 Top view of the rotor core shown;

[0027] Figure 4 This is a schematic diagram of the rotor assembly of the motor in the second embodiment of the present invention;

[0028] Figure 5 yes Figure 4 A longitudinal sectional view of the rotor assembly of the motor shown.

[0029] Figure 6 This is a schematic diagram of the rotor assembly of the motor in the third embodiment of the present invention;

[0030] Figure 7 yes Figure 6 A longitudinal sectional view of the rotor assembly of the motor shown.

[0031] Figure 8 yes Figure 6 A cross-sectional view of the rotor assembly of the motor shown.

[0032] Figure 9 yes Figure 8 A schematic diagram of the rotor core of the rotor assembly shown.

[0033] Figure 10 yes Figure 9 The top view of the rotor core shown. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] Figures 1 to 3 A first embodiment of the motor of the present invention is shown. This motor can serve as a drive mechanism to drive the rotation of an external device. The motor can be a permanent magnet motor. This motor has advantages such as high performance, long service life, low vibration and noise, and high sealing and safety.

[0036] Furthermore, in this embodiment, the motor may include a rotor assembly and a stator assembly that cooperates with the rotor assembly. The rotor assembly can output power by rotation, and the stator assembly can generate an electromagnetic field to drive the rotor assembly to rotate when energized.

[0037] like Figure 1 and Figure 2 As shown, further, in this embodiment, the rotor assembly may include a rotor core 10, a shaft 20, and magnets 30. The rotor core 10 may be columnar, and the shaft 20 may pass through the rotor core 10 and extend from both ends of the rotor core 10, and can be used to output power to drive the external device to rotate. There may be multiple magnets 30. In some embodiments, the multiple magnets 30 may be spaced apart along the outer peripheral wall of the rotor core 10 and may be attached to the outer peripheral wall of the rotor core 10.

[0038] like Figures 1 to 3 As shown, in this embodiment, the rotor core 10 may include a core body 11 and a central through hole 12. The core body 11 may be columnar and may include multiple silicon steel sheets 11a; these multiple silicon steel sheets 11a may be stacked sequentially along the longitudinal direction. The multiple silicon steel sheets 11a may be optimized and lightweighted to reduce losses to the entire motor. The central through hole 12 may be disposed along the longitudinal direction of the core body 11, penetrating the core body 11. In some embodiments, the inner diameter of the central through hole 12 may be slightly larger than the outer diameter of the shaft 20.

[0039] Furthermore, in this embodiment, a plurality of filling channels 13 may be provided on the iron core body 11. These multiple filling channels 13 are spaced apart circumferentially along the central through hole, and each filling channel 13 communicates with the central through hole 12. The filling channels 13 can be used to fill the colloidal material 40, thereby facilitating the connection of the rotating shaft 20 to the iron core body 11 to form an integral structure. In some embodiments, the filling channels 13 may be irregularly shaped. In some embodiments, the filling channels 13 may include a first channel 131 and a second channel 132. The first channel 131 may be cylindrical and extend longitudinally through the iron core body 11. The second channel 132 may also extend longitudinally through the iron core body 11 and connect the first channel 131 and the second channel 132. The second channel 132 may be a cuboid device. By providing the filling channel 13, in addition to allowing the colloid material 40 to be filled, the weight of the rotor core can be reduced, and the shaft can be prevented from damaging the silicon steel sheet 11a, thus avoiding deformation of the silicon steel sheet 11a. In some embodiments, by filling the core body 11 and the shaft 20 with colloid material 40 to form an integral structure, the concentricity of the core and the shaft 20 can be strengthened, the insulation performance of the shaft can be improved, and the overall vibration and noise of the motor can be reduced.

[0040] Furthermore, in this embodiment, the outer peripheral wall of the iron core body 11 is also provided with a plurality of limiting protrusions 14. These limiting protrusions 14 are spaced apart circumferentially along the iron core body 11. The side of the limiting protrusion 14 furthest from the iron core body 11 can be an arc surface. The limiting protrusion 14 can be used to limit the installation of the magnet 30 and can form the salient pole structure of the iron core body 11. In some embodiments, a mounting groove 16 can be formed between two adjacent limiting protrusions 14. The mounting groove 16 can be used for mounting the magnet 30. The bottom surface of the mounting groove 16 can be an arc surface, which can fit against the magnet 30.

[0041] Furthermore, in this embodiment, an antimagnetic groove 15 may be provided at the junction of the mounting groove 16 and the limiting protrusion 14. The antimagnetic groove 15 can reduce the magnetic field generated by the stator winding on the edge portion of the magnet 30, thereby reducing the impact on the overall magnetism of the magnet 30 and improving the performance and service life of the motor. In some embodiments, the antimagnetic groove 15 may extend longitudinally along the core body 11. In some embodiments, the antimagnetic groove 15 may be semi-arc-shaped; specifically, the radius of the antimagnetic groove 15 may be semi-circular, with a radius of 0.5~0.8 mm. In some embodiments, the distance W from the centerline of the antimagnetic groove 15 to the centerline of the antimagnetic groove 15 on the other side of the adjacent limiting protrusion 14 is 0.4~0.8 mm.

[0042] Furthermore, in this embodiment, the ratio of the polar arc coefficient corresponding to the mounting groove 16 to the polar arc coefficient between the two adjacent limiting protrusions 14 is 0.8 to 0.9, thereby controlling the ratio of the average value to the maximum value of the air gap induction intensity of each pole within a certain range, which can effectively make the back electromotive force waveform of the motor tend to be a sine wave or approach a sine wave.

[0043] Furthermore, in this embodiment, the magnet 30 can be a permanent magnet, and the magnet 30 can be tile-shaped, including an inner surface and an outer surface. The inner surface of the magnet 30 is a concave arc surface, and the outer surface of the magnet 30 is a convex arc surface. The curvature of the inner and outer surfaces of the magnet 30 is 90 degrees.

[0044] Further, in this embodiment, the colloid material 40 can be epoxy resin. It is understood that in some other embodiments, the colloid material 40 is not limited to epoxy resin; the colloid material 40 can fill the filling channel 13, connecting the rotating shaft 20 and the iron core body 11 to form an integral structure, and can form an insulating sleeve between the rotating shaft 20 and the iron core body 11, providing insulation protection for the rotating shaft 20 and preventing direct contact with the iron core body 11, which could lead to magnetic conduction of the rotating shaft and increase motor losses. Of course, it is understood that the colloid material 40 is not limited to filling the filling channel 13. In this embodiment, the colloid material 40 can also cover the iron core body 11 and the rotating shaft 20, forming an integral structure. The colloid material 40 can form a protective shell for the rotor assembly, improving the sealing performance of the rotor assembly, increasing its waterproof and dustproof rating, preventing the rotor core from direct contact with air and corrosion, and thus improving the overall service life of the motor. Specifically, the colloidal material 40 can cover the entire outer surface of the iron core body 11 and extend into the filling channel 13. Of course, it is understood that in some other embodiments, the colloidal material 40 can cover the entire outer surface of the iron core body 11 and extend to the connection points between the two ends of the iron core body 11 and the rotating shaft 20. By covering the entire outer surface of the iron core body 11 with the colloidal material 40, a metal housing can be eliminated, the rotor assembly weight can be reduced, motor losses can be reduced, and motor performance can be improved.

[0045] When assembling the rotor assembly, the rotor core 10 can be placed in the mold, and the rotating shaft can be inserted through the rotor core 10. Then, magnets 30 are attached to the filling channel 13 and the outer periphery of the rotor core 10. High-temperature epoxy resin is then filled around the outer periphery of the magnets 30 and the end face of the rotor core 10. After the epoxy resin cools and cures, the rotor core 10, magnets 30 and rotating shaft 20 are formed into an integral structure.

[0046] Figure 4 and Figure 5 A second embodiment of the motor of the present invention is shown, which differs from the first embodiment in that the colloidal material 40 is not limited to filling the filling channel 13. Instead, the colloidal material 40 can cover the entire outer surface of the iron core body 11, and the colloidal material at both ends of the iron core body 11 extends towards the rotating shaft 20, covering portions of the rotating shaft 20 and forming extension sections. In this embodiment, a flat section 41 can be provided on the outer wall of the extension section, which can be used for assembly with the stator assembly.

[0047] Figures 6 to 10A third embodiment of the motor of the present invention is shown, which differs from the first embodiment in that the magnet 30 is inserted into the rotor core 10 and arranged longitudinally. The plurality of magnets 30 can be arranged circumferentially at intervals along the central through hole 12 on the core body 11. In some embodiments, the core body 11 can be provided with a plurality of insertion holes 17, which can be arranged longitudinally through the magnets 30 and circumferentially at intervals along the central through hole 12. The plurality of insertion holes 17 can be inserted correspondingly to the plurality of magnets 30, and the insertion holes 17 can be inserted one-to-one with the magnets 30. The insertion hole 17 can be an arc-shaped hole, and the shape and size of the insertion hole 17 can be adapted to the shape and size of the magnet 30. In this embodiment, the arc length of the insertion hole 17 can be slightly larger than the arc length of the magnet 30, and the width of the insertion hole 17 can be comparable to the width of the magnet 30.

[0048] In this embodiment, a plurality of filling grooves 18 may be provided on the outer peripheral wall of the iron core body 11. These filling grooves 18 are spaced apart along the outer peripheral wall of the iron core body 11. The filling grooves 18 can be used to fill the colloidal material 40, thereby improving the stability of the fit between the colloidal material 40 and the iron core body 11. In this embodiment, the filling grooves 18 may extend longitudinally along the iron core body 11, and the cross-section of the filling groove 18 may be semi-circular. Of course, it is understood that in some other embodiments, the cross-section of the filling groove 18 is not limited to a semi-circular shape.

[0049] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A rotor assembly, characterized in that, It includes a rotor core (10), a rotating shaft (20) that passes through the rotor core (10) and extends from both ends of the rotor core (10), and a plurality of magnets (30) attached to the periphery of the rotor core (10). The rotor core (10) includes a columnar core body (11) and a central through hole (12) through which the rotating shaft (20) passes. The core body (11) and the rotating shaft (20) are integrated by filling with a colloid material (40) and by covering the core body (11) and the rotating shaft (20) with the colloid material (40); the colloid material (40) covers the entire outer surface of the core body (11); the colloid material (40) located at both ends of the core body (11) extends towards the rotating shaft (20) and covers a portion of the rotating shaft (20) to form an extension section; a flat part (41) is provided on the outer side wall of the extension section, and the flat part (41) is used for assembly with the stator assembly; The outer periphery of the iron core body (11) is provided with a plurality of limiting protrusions at intervals; the side of the limiting protrusions away from the iron core body (11) is an arc surface, forming a salient pole structure of the iron core body (11); the interval between two adjacent limiting protrusions forms an installation groove (16) for the magnet (30) to be installed; the ratio of the polar arc coefficient of the installation groove (16) to the polar arc coefficient between the two adjacent limiting protrusions is 0.8~0.9; an antimagnetic groove (15) is provided at the junction of the installation groove (16) and the limiting protrusions.

2. The rotor assembly according to claim 1, characterized in that, The iron core body (11) is provided with a plurality of filling channels (13) that communicate with the central through hole (12) for filling the colloidal material (40); the plurality of filling channels (13) are arranged at intervals along the circumference of the central through hole (12).

3. The rotor assembly according to claim 2, characterized in that, The filling channel (13) includes a first channel (131) that runs longitudinally through the core body (11) and a second channel (132) that connects the first channel (131) and the central through hole (12).

4. The rotor assembly according to claim 1, characterized in that, The colloidal material (40) is an epoxy resin adhesive; The core body (11) includes multiple silicon steel sheets (11a); the multiple silicon steel sheets (11a) are stacked sequentially along the longitudinal direction.

5. An electric motor, characterized in that, It includes the rotor assembly as described in any one of claims 1 to 4, and the stator assembly that cooperates with the rotor assembly.

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