Motor rotor assembly and noise reduction and efficiency improvement type plastic-coated motor

Abstract

The utility model discloses a motor rotor subassembly and noise reduction and improve efficiency type plastic -coated motor, wherein motor rotor subassembly includes rotor core, and the periphery of rotor core is annular distribution with a plurality of installation mouth, and the magnet is buckled and is connected in the installation mouth, and the magnetism direction of magnet is tangent to the circumferential direction of rotor core, and the outside of rotor core and magnet is connected with first plastic layer each other, and the both ends of first plastic layer extend to the outside of rotor core and form insulation end, the periphery of rotor core is distributed with a plurality of first clamping groove and second clamping piece, the periphery of first plastic layer is buckled and is connected first clamping groove through first clamping piece, and the periphery of first plastic layer is buckled and is connected second clamping piece through second clamping groove, and first clamping piece and second clamping piece all are located the radial outside of magnet. The utility model can improve the structural stability of motor.

Description

Technical Field

[0001] This utility model relates to a washing machine motor, and more particularly to a motor rotor assembly and a noise-reducing and efficiency-enhancing plastic-coated motor. Background Technology

[0002] Currently, the rotor of a BLDC motor used in washing machines mainly consists of a rotor core and a plastic coating layer. The plastic coating layer covers and fixes the rotor core from the outside, while the inner side of the rotor core is connected to the motor shaft. Furthermore, to improve the motor's magnetic flux and efficiency, magnets can be inserted between adjacent rotor teeth of the rotor core, thereby increasing the magnetic field strength through magnetic field superposition.

[0003] However, the aforementioned motor rotor has a drawback: the existing plastic-coated structure used for the rotor core and magnets is prone to loosening and shifting, resulting in relatively poor stability. Furthermore, to improve the processing efficiency of BLDC motors, manufacturers currently use injection molding to form a plastic shell structure on the stator assembly, replacing the conventional metal motor housing and simplifying the motor structure. However, this structure causes the plastic shell to impact the stator assembly's leads during injection molding, increasing the likelihood of breakage during the stator injection molding process.

[0004] Therefore, existing BLDC motors suffer from low efficiency and poor structural stability. Utility Model Content

[0005] The purpose of this invention is to provide a motor rotor assembly and a noise-reducing and efficiency-enhancing plastic-coated motor. This improves the structural stability of the motor.

[0006] The technical solution of this utility model is as follows: A motor rotor assembly includes a rotor core. Several mounting openings are arranged in a ring around the rotor core. Magnets are fastened into the mounting openings, and the magnetization direction of the magnets is tangential to the circumference of the rotor core. The rotor core and the magnets are interconnected via a first plastic coating layer. Both ends of the first plastic coating layer extend to the outer side of the rotor core and form insulating ends. Several first snap-fit ​​slots and second snap-fit ​​pieces are distributed around the rotor core. The first snap-fit ​​pieces fasten the first snap-fit ​​slots around the first plastic coating layer, and the second snap-fit ​​pieces fasten the second snap-fit ​​pieces around the first plastic coating layer via second snap-fit ​​slots. Both the first and second snap-fit ​​pieces are located radially outside the magnets.

[0007] In the aforementioned motor rotor assembly, the cross-sectional shape of the magnet is trapezoidal, and the width of the magnet gradually increases from the inside to the outside along the radial direction of the rotor core.

[0008] In the aforementioned motor rotor assembly, the rotor core between adjacent mounting ports forms core teeth, and the first snap-fit ​​groove and the second snap-fit ​​member are alternately distributed on both sides of the outer wall of the core teeth along the axial direction of the rotor core.

[0009] In the aforementioned motor rotor assembly, the core teeth are provided with injection holes in the middle, and the first plastic coating layer extends through the injection holes to the outer sides of both ends of the rotor core and forms insulating ends.

[0010] A noise-reducing and efficiency-enhancing plastic-coated motor is also provided, which includes the aforementioned motor rotor assembly.

[0011] In the aforementioned noise-reducing and efficiency-enhancing plastic-coated motor, the inner side of the motor rotor assembly is connected to a motor shaft, the outer side of the motor rotor assembly is connected to a motor stator assembly, and the outer side of the motor stator assembly is connected to a motor housing. The outer side of the motor housing is provided with multiple mounting feet, each mounting foot having a mounting hole in the middle, and a rubber pad is fastened to the mounting hole. An adapter is connected inside the motor housing, one end of which is electrically connected to the stator winding, and the other end of which extends to the outer side of the motor housing and forms a slot.

[0012] In the aforementioned noise-reducing and efficiency-enhancing plastic-coated motor, the motor stator assembly includes a stator core, a stator frame connected to the outside of the stator core, a stator winding wound around the outside of the stator frame, a second plastic coating layer covering the outside of the stator winding, a mounting cavity for accommodating the motor rotor assembly formed in the middle of the second plastic coating layer, and a motor housing formed on the outer surface of the second plastic coating layer.

[0013] In the aforementioned noise-reducing and efficiency-enhancing plastic-coated motor, a motor end cover is fastened to the outer end of the mounting cavity. Several outwardly protruding clamping blocks are distributed around the motor end cover. The outer side of the clamping blocks is in contact with the side wall of the mounting cavity to form an interference fit.

[0014] In the aforementioned noise-reducing and efficiency-enhancing plastic-coated motor, the motor housing on one side of the motor end cover is provided with an opening that matches the motor end cover.

[0015] In the aforementioned noise-reducing and efficiency-enhancing plastic-coated motor, the rubber pad is fitted inside the mounting hole, with one end of the rubber pad extending to the outside of the mounting hole and forming a vibration damping part, and the other end of the rubber pad extending to the mounting hole and forming a limiting part.

[0016] Compared with the prior art, this utility model has the following characteristics:

[0017] (1) By combining the first plastic coating layer with the first snap-fit ​​component, the first snap-fit ​​groove, the second snap-fit ​​component, and the second snap-fit ​​groove, this utility model can, on the one hand, use the first plastic coating layer to fasten and fix the rotor core, thereby improving the fixing effect of the rotor core and reducing the possibility of the rotor core being deviated by force; on the other hand, it can also use the cooperation of the first snap-fit ​​component and the second snap-fit ​​component to form a radial limit on the outer end of the magnet, thereby effectively reducing the possibility of the magnet being deviated by force.

[0018] (2) By limiting the shape and magnetization direction of the magnet, it can increase the magnetic field strength of the motor compared with the rectangular magnet structure, thereby improving the motor efficiency;

[0019] (3) By limiting the structure of the adapter, on the one hand, the connection stability between the stator winding and the external power line can be improved, and the damage to the stator winding lead wire caused by the second plastic coating layer during the injection molding process can be avoided. On the other hand, the operator can directly insert the plug of the power line into the slot to connect the power, which makes it convenient for the operator to connect the motor to the power.

[0020] (4) By limiting the structure of the rubber pad, the vibration reduction and noise reduction effect of the motor after installation can be effectively improved compared with the existing thin sheet-shaped rubber pad; by limiting the structure of the motor end cover, the motor end cover can be fixed by pressing, which effectively improves the installation convenience of the motor end cover compared with the existing bolt fixing method.

[0021] Therefore, this invention can improve the structural stability of the motor. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of Example 1;

[0023] Figure 2 This is a cross-sectional view of Example 1;

[0024] Figure 3 This is a schematic diagram of the structure of Example 1 after the first plastic coating layer has been removed;

[0025] Figure 4 This is a schematic diagram of the connection between the rotor core and the magnet in Example 2;

[0026] Figure 5 This is a structural schematic diagram of Example 3;

[0027] Figure 6 This is a schematic diagram of the structure of Example 3 after removing the second plastic coating layer and the rubber pad.

[0028] The labels in the attached diagram are as follows: 1-rotor core, 2-magnet, 3-first plastic coating layer, 4-first snap-fit ​​groove, 5-second snap-fit ​​component, 6-first snap-fit ​​component, 7-second snap-fit ​​groove, 8-injection hole, 9-motor shaft, 10-motor stator assembly, 11-motor housing, 12-mounting foot, 13-rubber pad, 14-motor end cover, 15-pressing block, 16-opening, 17-adapter component, 131-vibration damping part, 132-limiting part. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0030] Example 1. A motor rotor assembly, configured as follows: Figure 1-3 As shown, it includes a rotor core 1, with several mounting openings arranged in a ring around the rotor core 1. A magnet 2 is fastened and connected inside the mounting opening. The magnetization direction of the magnet 2 is tangent to the circumference of the rotor core 1. The rotor core 1 and the magnet 2 are connected to each other through a first plastic coating layer 3. The two ends of the first plastic coating layer 3 extend to the outside of the rotor core 1 and form insulating ends. After injection molding, the insulating ends completely cover the end faces of the rotor core 1 and the magnet 2.

[0031] The rotor core 1 has several first snap-fit ​​grooves 4 and second snap-fit ​​pieces 5 distributed around its perimeter. The perimeter of the first plastic coating layer 3 is fastened to the first snap-fit ​​grooves 4 via the first snap-fit ​​pieces 6, and the perimeter of the first plastic coating layer 3 is fastened to the second snap-fit ​​pieces 5 via the second snap-fit ​​grooves 7. The first snap-fit ​​pieces 6 and the second snap-fit ​​pieces 5 are both located on the radial outer side of the magnet 2.

[0032] A gap is formed between the rotor core 1 and the magnet 2, and the gap is completely filled by the first plastic coating layer 3.

[0033] The rotor core 1 between adjacent mounting ports forms core teeth. The first snap-fit ​​groove 4 and the second snap-fit ​​piece 5 are alternately distributed on both sides of the outer wall of the core teeth along the axial direction of the rotor core 1. The first snap-fit ​​groove 4 and the second snap-fit ​​piece 5 on the outer walls of both sides are staggered vertically.

[0034] The core teeth are provided with injection holes 8 in the middle, and the first plastic coating layer 3 extends through the injection holes 8 to the outer sides of both ends of the rotor core 1 and forms an insulating end.

[0035] This embodiment defines the connection structure between the first plastic coating layer 3 and the rotor core 1, allowing the first plastic coating layer 3 and the rotor core 1 to be interlocked on both sides of the core teeth via the cooperation of the first snap-fit ​​member 6 and the second snap-fit ​​member 5. This improves the connection stability of the two and reduces the possibility of the rotor core 1 becoming loose or shifting. Furthermore, the cooperation of the rotor core 1 and the second snap-fit ​​member 5 can be used to radially limit the magnet 2, thereby preventing the magnet 2 from becoming loose or shifting and improving the structural stability of the motor rotor after injection molding.

[0036] Example 2. A motor rotor assembly, configured as follows: Figure 4 As shown, the rotor core 1 has several mounting openings arranged in a ring around its perimeter. A trapezoidal magnet 2 is fastened and connected to each mounting opening. The width of the magnet 2 gradually increases from the inside to the outside along the radial direction of the rotor core 1. The magnetization direction of the magnet 2 is tangent to the circumference of the rotor core 1. The rotor core 1 and the magnet 2 are connected to each other through a first plastic coating layer 3. The two ends of the first plastic coating layer 3 extend to the outside of the rotor core 1 and form insulating ends. After injection molding, the insulating ends completely cover the end faces of the rotor core 1 and the magnet 2.

[0037] The rotor core 1 has several first snap-fit ​​grooves 4 and second snap-fit ​​pieces 5 distributed around its perimeter. The perimeter of the first plastic coating layer 3 is fastened to the first snap-fit ​​grooves 4 via the first snap-fit ​​pieces 6, and the perimeter of the first plastic coating layer 3 is fastened to the second snap-fit ​​pieces 5 via the second snap-fit ​​grooves 7. The first snap-fit ​​pieces 6 and the second snap-fit ​​pieces 5 are both located on the radial outer side of the magnet 2.

[0038] A gap is formed between the rotor core 1 and the magnet 2, and the gap is completely filled by the first plastic coating layer 3.

[0039] The rotor core 1 between adjacent mounting ports forms core teeth. The first snap-fit ​​groove 4 and the second snap-fit ​​piece 5 are alternately distributed on both sides of the outer wall of the core teeth along the axial direction of the rotor core 1. The first snap-fit ​​groove 4 and the second snap-fit ​​piece 5 on the outer walls of both sides are staggered vertically.

[0040] The core teeth are provided with injection holes 8 in the middle, and the first plastic coating layer 3 extends through the injection holes 8 to the outer sides of both ends of the rotor core 1 and forms an insulating end.

[0041] Compared with Example 1, this example improves the motor efficiency by 3%-4% by changing the magnet 2 from a conventional rectangular structure to a trapezoidal structure.

[0042] Example 3. Noise-reducing and efficiency-enhancing plastic-coated motor, configured as follows: Figure 5-6As shown, the motor rotor assembly of Embodiment 1 is included. The inner side of the motor rotor assembly is connected to the motor shaft 9, the outer side of the motor rotor assembly is connected to the motor stator assembly 10, and the outer side of the motor stator assembly 10 is connected to the motor housing 11. The outer side of the motor housing 11 is provided with a plurality of mounting feet 12, and each mounting foot 12 is provided with a mounting hole in the middle. A rubber pad 13 is fastened to the mounting hole. An adapter 17 is connected inside the motor housing 11. One end of the adapter 17 is electrically connected to the stator winding, and the other end of the adapter 17 extends to the outer side of the motor housing 11 and forms a slot.

[0043] The motor stator assembly 10 includes a stator core, a stator frame connected to the outside of the stator core, a stator winding wound around the outside of the stator frame, a second plastic coating layer covering the outside of the stator winding, a mounting cavity for accommodating the motor rotor assembly formed in the middle of the second plastic coating layer, and a motor housing 11 formed on the outer surface of the second plastic coating layer.

[0044] The adapter 17 includes an insulating shell with multiple conductive sheets spaced apart on the inner side of the insulating shell. One end of each conductive sheet extends through the insulating shell into the second plastic coating layer and connects to the stator winding. Another end of each conductive sheet extends through the insulating shell into a slot for connecting a power cord. The insulating shell is injection molded on the outside of the conductive sheets, and the second plastic coating layer is injection molded on the outside of the adapter 17.

[0045] The outer end of the mounting cavity is fastened to a motor end cover 14. Several outwardly protruding clamping blocks 15 are distributed around the motor end cover 14. The cross-sectional shape of the clamping blocks 15 is triangular. The outer side of the clamping blocks 15 is in contact with the side wall of the mounting cavity to form an interference fit.

[0046] The motor housing 11 on one side of the motor end cover 14 is provided with an opening 16 that matches the motor end cover 14.

[0047] The rubber pad 13 has a round hole in the middle for the mounting bolt to pass through; the rubber pad 13 is fitted into the mounting hole, one end of the rubber pad 13 extends to the outside of the mounting hole and forms a vibration damping part 131, the vibration damping part 131 has a stepped groove in the middle, and the other end of the rubber pad 13 extends to the mounting hole and forms a limiting part 132; the external mounting bracket has a stepped column that matches the stepped groove. During installation, the stepped column is snapped into the stepped groove and the mounting bracket and the mounting foot 12 are connected and fixed to each other by the cooperation of bolts and nuts.

[0048] In this embodiment, the adapter 17 allows the stator windings of the motor stator assembly 10 to be connected to the conductive sheets within the adapter 17 during manufacturing. Then, a second plastic coating layer is injection molded onto the outside of the stator windings and the adapter 17, encapsulating them. During the injection molding process, the insulating shell protects and positions the inner conductive sheets, ensuring the conductivity of the conductive sheets after the second plastic coating layer is injection molded. Furthermore, the outer surface of the second plastic coating layer forms a slot for connecting the power cord, reducing the difficulty of subsequent wiring of the motor.

[0049] By defining the structure of the rubber pad 13, the rubber pad 13 can effectively increase the rubber thickness between the mounting foot 12 and the external mounting bracket compared to existing thin-sheet rubber pads, thereby improving the vibration damping effect of the motor after installation.

Claims

1. A motor rotor assembly, characterized in that: The rotor core (1) is surrounded by several mounting holes arranged in a ring around its perimeter. A magnet (2) is fastened and connected to the mounting holes. The magnetization direction of the magnet (2) is tangent to the circumference of the rotor core (1). The rotor core (1) and the magnet (2) are connected to each other through a first plastic coating layer (3). The two ends of the first plastic coating layer (3) extend to the outside of the rotor core (1) and form insulating ends. Several first snap-fit ​​grooves (4) and second snap-fit ​​pieces (5) are distributed around the rotor core (1). The first snap-fit ​​grooves (4) are fastened and connected to the first plastic coating layer (3) through the first snap-fit ​​pieces (6). The second snap-fit ​​pieces (5) are fastened and connected to the first plastic coating layer (3) through the second snap-fit ​​grooves (7). The first snap-fit ​​pieces (6) and the second snap-fit ​​pieces (5) are both located on the radial outside of the magnet (2).

2. The motor rotor assembly according to claim 1, characterized in that: The cross-sectional shape of the magnet is trapezoidal, and the width of the magnet (2) gradually increases from the inside to the outside along the radial direction of the rotor core (1).

3. The motor rotor assembly according to claim 1, characterized in that: The rotor core (1) between adjacent mounting ports forms core teeth, and the first snap-fit ​​groove (4) and the second snap-fit ​​piece (5) are alternately distributed on both sides of the outer wall of the core teeth along the axial direction of the rotor core (1).

4. A motor rotor assembly according to claim 3, characterized in that: The iron core teeth are provided with injection holes (8) in the middle. The first plastic coating layer (3) extends through the injection holes (8) to the outer sides of both ends of the rotor iron core (1) and forms an insulating end.

5. A noise-reducing and efficiency-enhancing plastic-coated motor, characterized in that: The noise-reducing and efficiency-enhancing plastic-coated motor includes the motor rotor assembly as described in any one of claims 1-4.

6. The noise-reducing and efficiency-enhancing plastic-coated motor according to claim 5, characterized in that: The inner side of the motor rotor assembly is connected to the motor shaft (9), the outer side of the motor rotor assembly is connected to the motor stator assembly (10), the outer side of the motor stator assembly (10) is connected to the motor housing (11), the outer side of the motor housing (11) is provided with multiple mounting feet (12), each mounting foot (12) is provided with a mounting hole in the middle, and a rubber pad (13) is fastened to the mounting hole; the inner side of the motor housing (11) is connected to the adapter (17), one end of the adapter (17) is electrically connected to the stator winding, and the other end of the adapter (17) extends to the outer side of the motor housing (11) and forms a slot.

7. The noise-reducing and efficiency-enhancing plastic-coated motor according to claim 6, characterized in that: The motor stator assembly (10) includes a stator core, a stator frame connected to the outside of the stator core, a stator winding wound around the outside of the stator frame, a second plastic coating layer covering the outside of the stator winding, a mounting cavity for accommodating the motor rotor assembly formed in the middle of the second plastic coating layer, and a motor housing (11) formed on the outer surface of the second plastic coating layer.

8. The noise-reducing and efficiency-enhancing plastic-coated motor according to claim 7, characterized in that: The outer end of the mounting cavity is fastened to a motor end cover (14). Several outwardly protruding clamping blocks (15) are distributed around the motor end cover (14). The outer side of the clamping blocks (15) is in contact with the side wall of the mounting cavity to form an interference fit.

9. The noise-reducing and efficiency-enhancing plastic-coated motor according to claim 8, characterized in that: The motor housing (11) on one side of the motor end cover (14) is provided with an opening (16) that matches the motor end cover (14).

10. The noise-reducing and efficiency-enhancing plastic-coated motor according to claim 6, characterized in that: The rubber pad (13) is fitted inside the mounting hole. One end of the rubber pad (13) extends to the outside of the mounting hole and forms a damping part (131). The other end of the rubber pad (13) extends to the mounting hole and forms a limiting part (132).

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