Motor rotor, motor, air conditioner

Abstract

The present invention provides a motor rotor, a motor, and an air conditioner, wherein the motor rotor includes an inner iron core and an outer iron core, wherein the outer iron core is arranged circumferentially around the inner iron core and a first gap is provided between the outer iron core and the inner iron core, wherein the outer iron core has a first axial through hole close to the inner iron core and a second axial through hole away from the inner iron core, and further includes a fixed body and a shock absorbing body, wherein the fixed body has a first fixed portion passing through the second axial through hole, and the shock absorbing body has a first shock absorbing portion passing through the first gap and a second shock absorbing portion passing through the first axial through hole. According to the present invention, the fixed body can form reliable axial and radial positioning for the outer iron core through the first fixed portion, and at the same time, the shock absorbing body improves the shock absorbing effect of the entire motor rotor through the first shock absorbing portion and the second shock absorbing portion, effectively avoiding the problems of poor dynamic balance and poor strength caused by the weight of the motor rotor being concentrated on the outer iron core in the prior art, and improving the overall dynamic balance and stability of the motor rotor.

Description

Technical Field

[0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a motor rotor, a motor and an air conditioner. Background Art

[0002] With the government's energy-saving policy orientation and market development needs, the direct current (DC) trend has gradually emerged in household appliance fans. Currently, the brushless motors used in the industry are all radial magnetic field surface-mount structures, with low motor power density and low material utilization.

[0003] Due to the rising market prices of motor raw materials, high power density motors have become the development trend of brushless DC motors. In permanent magnet motors, in order to improve motor performance, it is usually necessary to obtain higher rotor magnetic properties. Under limited structures, compared with surface-mounted and embedded radial rotors, the built-in tangential rotor structure can effectively increase the flux area, increase the effective air gap flux, and thus improve motor performance. However, the dynamic balance and anti-armature reaction of the motor with the embedded tangential magnetic field rotor structure are worse than those of the motor with the surface-mounted rotor. The load torque pulsation is large, and it is easy to resonate with the motor mounting bracket and the fan blade to produce noise. Since the core and magnet of the embedded tangential magnetic field rotor are distributed on the outer ring, and in order to ensure that the size of the magnet is matched, the magnet should be as close to the inner ring as possible along the radial direction, which makes the inner ring space limited. The industry's traditional design of shock absorption measures in the inner ring, because the weight of the rotor is mainly concentrated on the outer ring, the use of elastic materials will cause the rotor dynamic balance to deteriorate, and the actual shock absorption and noise reduction effect cannot be achieved. Summary of the invention

[0004] Therefore, the present invention provides a motor rotor, a motor, and an air conditioner, which can overcome the shortcomings of the related art that the outer iron core lacks shock-absorbing support and positioning, the rotor has poor dynamic balance, and the shock-absorbing effect is poor.

[0005] In order to solve the above problems, the present invention provides a motor rotor, including an inner iron core and an outer iron core, the outer iron core is arranged around the circumference of the inner iron core and a first gap is provided between the outer iron core and the inner iron core, the outer iron core has a first axial through hole close to the inner iron core and a second axial through hole away from the inner iron core, and also includes a fixed body and a shock absorber, the fixed body has a first fixed portion passing through the second axial through hole, the shock absorber has a first shock absorber portion passing through the first gap and a second shock absorber portion passing through the first axial through hole.

[0006] Preferably, the fixed body has a second fixing portion passing through the first gap, and projected on any radial plane of the inner core, a staggered concave-convex structure gap is formed between the inner core and the second fixing portion, and the first shock-absorbing portion is filled in the concave-convex structure gap.

[0007] Preferably, the second fixing portion is cylindrical, and has a plurality of first ridges extending radially toward one side of the inner core, and the outer peripheral wall of the inner core has a plurality of second ridges extending radially toward one side of the outer core, and at least one of the plurality of first ridges is located between two adjacent plurality of second ridges.

[0008] Preferably, the outer core comprises a plurality of core sub-bodies spaced apart along the circumference of the inner core, the plurality of the first axial through holes are respectively and one by one located on the core sub-bodies, and the plurality of the second axial through holes are respectively and one by one located on the core sub-bodies.

[0009] Preferably, a radial magnetic steel groove is formed between two adjacent iron core sub-bodies, and a magnetic steel is installed in the radial magnetic steel groove. The axial length of the magnetic steel is shorter than the axial length of the outer iron core so that a first groove can be formed at the axial first end of the motor rotor, and the fixed body has a first fixed end corresponding to the axial first end of the motor rotor, and the first fixed end has a first connecting portion located in the first groove, and / or, the axial length of the magnetic steel is shorter than the axial length of the outer iron core so that a second groove can be formed at the axial second end of the motor rotor, and the fixed body has a second fixed end corresponding to the axial second end of the motor rotor, and the second fixed end has a second connecting portion located in the second groove.

[0010] Preferably, the first fixed end portion also has a first ring portion corresponding to the second axial through hole, the first ring portion protrudes from the end surface of the first axial end, and the first fixing portion and the second fixing portion are connected as a whole through the first ring portion and the first connecting portion; and / or, the second fixed end portion also has a second ring portion corresponding to the second axial through hole, the second ring portion protrudes from the end surface of the second axial end, and the first fixing portion and the second fixing portion are connected as a whole through the second ring portion and the second connecting portion.

[0011] Preferably, the shock-absorbing body also has a first shock-absorbing end portion corresponding to the first axial end, the first shock-absorbing end portion connects the first shock-absorbing portion and the second shock-absorbing portion as a whole, and the first shock-absorbing end portion is located radially inside the first ring portion and can cover the first connecting portion; and / or, the shock-absorbing body also has a second shock-absorbing end portion corresponding to the second axial end, the second shock-absorbing end portion connects the first shock-absorbing portion and the second shock-absorbing portion as a whole, and the second shock-absorbing end portion is located radially inside the second ring portion and can cover the second connecting portion.

[0012] Preferably, the radial magnetic steel slot has a radial opening toward the radial outside of the inner iron core, and the radial opening is filled with a third fixing portion, the axial first end of the third fixing portion is connected as a whole with the first ring portion, and / or the axial second end of the third fixing portion is connected as a whole with the second ring portion.

[0013] The present invention also provides a motor, comprising the motor rotor mentioned above.

[0014] The present invention also provides an air conditioner, comprising the above-mentioned motor.

[0015] The present invention provides a motor rotor, a motor, and an air conditioner, wherein the fixed body can form reliable axial and radial positioning for the outer iron core through the first fixing part, and the shock absorbing body improves the shock absorbing effect of the entire motor rotor through the first shock absorbing part and the second shock absorbing part, effectively avoiding the problems of poor dynamic balance and poor strength caused by the weight of the motor rotor being concentrated on the outer iron core in the prior art, and improving the overall dynamic balance and stability of the motor rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the axial cross-section of the motor rotor of an embodiment of the present invention (a cross-section passing through the radial symmetric plane of the magnetic steel, the radial symmetric plane of the first axial through hole, and the rotor axis);

[0017] Figure 2 for Figure 1 Schematic diagram of the decomposition structure;

[0018] Figure 3 for Figure 1 Schematic diagram of the axial projection of the motor rotor in (before the shock absorber is filled);

[0019] Figure 4 for Figure 3 Schematic diagram of the three-dimensional structure of the motor rotor (the fixed body and the shock absorbing body are not shown).

[0020] The reference numerals are:

[0021] 1. Inner iron core; 11. Second convex strip; 2. Outer iron core; 21. First axial through hole; 22. Second axial through hole; 23. Iron core sub-body; 3. Fixed body; 31. First fixed part; 32. Second fixed part; 321. First convex strip; 33. First fixed end; 331. First connecting part; 332. First ring part; 34. Second fixed end; 341. Second connecting part; 342. Second ring part; 35. Third fixed part; 4. Shock-absorbing body; 41. First shock-absorbing part; 42. Second shock-absorbing part; 43. First shock-absorbing end; 44. Second shock-absorbing end; 5. Concave-convex structure gap; 6. Magnetic steel; 7. Radial magnetic steel groove; 71. Radial opening; 72. First groove. DETAILED DESCRIPTION

[0022] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, a motor rotor is provided, in particular, a motor permanent magnet rotor with an embedded tangential magnetic field structure, comprising an inner iron core 1 and an outer iron core 2, wherein the outer iron core 2 is arranged circumferentially around the inner iron core 1 and a first gap is provided between the outer iron core 2 and the inner iron core 1, the outer iron core 2 has a first axial through hole 21 close to the inner iron core 1 and a second axial through hole 22 away from the inner iron core 1, and further comprises a fixing body 3 and a shock absorbing body 4, wherein the fixing body 3 has a first fixing portion 31 passing through the second axial through hole 22, and the shock absorbing body 4 has a first shock absorbing portion 41 passing through the first gap and a second shock absorbing portion 42 passing through the first axial through hole 21. In this technical solution, the fixed body 3 can form reliable axial and radial positioning for the outer iron core 2 through the first fixed part 31, and at the same time, the shock absorbing body 4 improves the shock absorbing effect of the entire motor rotor through the first shock absorbing part 41 and the second shock absorbing part 42, effectively avoiding the problems of poor dynamic balance and poor strength caused by the weight of the motor rotor being concentrated on the outer iron core 2 (which can be understood as the outer ring of the rotor) in the prior art, thereby improving the overall dynamic balance and stability of the motor rotor.

[0023] In some embodiments, the fixed body 3 has a second fixed portion 32 that passes through the first gap, and when projected onto any radial plane of the inner core 1, a staggered concave-convex structure gap 5 is formed between the inner core 1 and the second fixed portion 32, and the first shock absorbing portion 41 is filled in the concave-convex structure gap 5. Specifically, the second fixed portion 32 is cylindrical, and the second fixed portion 32 has a plurality of first ridges 321 extending radially toward one side of the inner core 1, and the outer peripheral wall of the inner core 1 has a plurality of second ridges 11 extending radially toward one side of the outer core 2, and at least one of the plurality of first ridges 321 is located between two adjacent majority second ridges 11. In this technical solution, by filling the first shock-absorbing part 41 in the concave-convex structure gap 5, the connection strength between the inner iron core 1 and the outer iron core 2 can be further improved, thereby ensuring the shock-absorbing effect of the rotor. By forming the concave-convex structure gap 5 between the first convex strip 321 and the second convex strip 11, the difficulty of structural design of the outer iron core 2 facing the inner iron core 1 can be reduced, thereby improving production efficiency.

[0024] In some embodiments, the outer core 2 includes a plurality of core sub-bodies 23 arranged at intervals along the circumference of the inner core 1, and a plurality of the first axial through holes 21 are respectively located on the core sub-bodies 23 in a one-to-one correspondence, and a plurality of the second axial through holes 22 are respectively located on the core sub-bodies 23 in a one-to-one correspondence. In this technical solution, the outer core 2 is formed by splicing a plurality of the core sub-bodies 23. At this time, the plurality of core sub-bodies 23 are effectively positioned, fixed and damped by the fixing body 3 and the damping body 4, which effectively prevents the occurrence of problems such as misalignment of the inner and outer cores, insufficient support strength and poor dynamic balance caused by the unreliable damping connection between the plurality of core sub-bodies in the related art and the radial outer wall of the inner ring core (i.e., the inner core 1) through the limited radial inner wall.

[0025] In some embodiments, a radial magnetic steel groove 7 is formed between two adjacent core sub-bodies 23, and a magnetic steel 6 is installed in the radial magnetic steel groove 7. The axial length of the magnetic steel 6 is shorter than the axial length of the outer iron core 2 so that a first groove 72 can be formed at the axial first end of the motor rotor. The fixed body 3 has a first fixed end 33 corresponding to the axial first end of the motor rotor, and the first fixed end 33 has a first connecting portion 331 located in the first groove 72, and / or, the axial length of the magnetic steel 6 is shorter than the axial length of the outer iron core 2 so that a second groove (not marked in the figure) can be formed at the axial second end of the motor rotor, and the fixed body 3 has a second fixed end 34 corresponding to the axial second end of the motor rotor, and the second fixed end 34 has a second connecting portion 341 located in the second groove. In this technical solution, a plurality of first grooves 72 and second grooves are respectively left at the axial ends of the radial magnetic steel slot 7, so that the first connecting portion 331 and the second connecting portion 341 can be respectively located in the corresponding grooves, thereby realizing the integration of the structure of the fixed body 3 and facilitating the reduction of the axial length of the motor rotor, which can especially meet the miniaturization and compactness design requirements of the motor.

[0026] In some embodiments, the first fixed end portion 33 further has a first ring portion 332 corresponding to the second axial through hole 22, the first ring portion 332 protrudes from the end surface of the first axial end, and the first fixed portion 31 and the second fixed portion 32 are connected as a whole through the first ring portion 332 and the first connecting portion 331; and / or, the second fixed end portion 34 further has a second ring portion 342 corresponding to the second axial through hole 22, the second ring portion 342 protrudes from the end surface of the second axial end, and the first fixed portion 31 and the second fixed portion 32 are connected as a whole through the second ring portion 342 and the second connecting portion 341. In this technical solution, it can be understood that the first ring portion 332 and the second ring portion 342 are respectively convex ring structures protruding from the corresponding axial end surfaces of the motor rotor, so that an edge positioning structure of the internal structure can be formed.

[0027] Corresponding to the first ring portion 332 and the second ring portion 342, in some embodiments, the shock absorber 4 also has a first shock absorber end portion 43 corresponding to the first axial end, the first shock absorber end portion 43 connects the first shock absorber portion 41 and the second shock absorber portion 42 as a whole, and the first shock absorber end portion 43 is located radially inside the first ring portion 332 and can cover the first connection portion 331; and / or, the shock absorber 4 also has a second shock absorber end portion 44 corresponding to the second axial end, the second shock absorber end portion 44 connects the first shock absorber portion 41 and the second shock absorber portion 42 as a whole, and the second shock absorber end portion 44 is located radially inside the second ring portion 342 and can cover the second connection portion 341. It can be understood that at this time, the outer peripheral edge of the first shock absorber end portion 43 is defined by the first ring portion 332, and the outer peripheral edge of the second shock absorber end portion 44 is defined by the second ring portion 342, thereby facilitating the injection molding of the shock absorber 4.

[0028] In some embodiments, the radial magnetic steel slot 7 has a radial opening 71 facing the radial outer side of the inner iron core 1, and the radial opening 71 is filled with a third fixing portion 35, and the axial first end of the third fixing portion 35 is connected to the first ring portion 332 as a whole, and / or the axial second end of the third fixing portion 35 is connected to the second ring portion 342 as a whole. In this technical solution, the third fixing portion 35 can form an effective fixed support for the radial outer end surface of the magnetic steel 6 in the radial magnetic steel slot 7, which can further improve the connection strength and shock absorption effect of the overall structure of the motor rotor.

[0029] It should be noted that at this time, the axial ends of the first damping part 41 and the second damping part 42 respectively form an integrated cage-shaped damping body (formed as an organic whole by injection molding) through the first damping end 43 and the second damping end 44, which reliably damps the connection of the motor rotor from the radial inside to the outside and from one end to the other in the axial direction, and effectively prevents the motor rotor from being dislocated due to excessive centrifugal force caused by the weight of the motor rotor being concentrated on the outer ring of the rotor (that is, close to the side of the outer iron core 2), thereby reducing the dynamic balance. Similarly, the axial ends of the first fixed part 31, the second fixed part 32, and the third fixed part 35 form an integrated cage-shaped damping body (formed as an organic whole by injection molding) through the first fixed end 33 and the second fixed end 34. It can be understood that although the damping body 4 and the fixed body 3 can both be filled and formed by injection molding, their specific material selection is not the same. For example, the material selected for the damping body 4 can be rubber, while the material selected for the fixed body 3 can be nylon, PBT and other plastic materials.

[0030] The motor rotor in the present invention can be assembled and processed in the following manner:

[0031] The first step: using a stamping die to stack the silicon steel sheets into an outer core and an inner core;

[0032] Step 2: Use a die-casting mold to die-cast the magnetic powder into corresponding magnetic steel;

[0033] Step 3: magnetizing the magnetic steel;

[0034] Step 4: Install the outer iron core and magnetic steel into the injection mold in sequence, perform high temperature injection molding, shape the fixed body according to the designed structure and fix the outer iron core and magnetic steel into shape (forming the plastic-coated rotor part);

[0035] Step 5: Install the plastic-coated rotor part and the inner iron core into the injection mold, perform high-temperature injection molding, and the shock absorber is molded as a whole according to the designed structure;

[0036] Furthermore, the third, fourth and fifth steps can also be adjusted according to actual production, such as:

[0037] Step 3: Install the outer iron core and magnetic steel into the injection mold in sequence, perform high temperature injection molding, shape the fixed body according to the designed structure and fix the outer iron core and magnetic steel into shape (forming the plastic-coated rotor part);

[0038] Step 4: Install the plastic-coated rotor part and the inner iron core into the injection mold, perform high-temperature injection molding, and the shock absorber is molded as a whole according to the designed structure;

[0039] Step 5: Post-magnetize the injection molded integrated rotor.

[0040] According to an embodiment of the present invention, there is further provided a motor, comprising the motor rotor described above.

[0041] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the above-mentioned motor.

[0042] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A motor rotor, characterized in that: The invention comprises an inner iron core (1) and an outer iron core (2), wherein the outer iron core (2) is arranged around the circumference of the inner iron core (1) and a first gap is provided between the outer iron core (2) and the inner iron core (1), wherein the outer iron core (2) has a first axial through hole (21) close to the inner iron core (1) and a second axial through hole (22) away from the inner iron core (1), and further comprises a fixing body (3) and a shock absorbing body (4), wherein the fixing body (3) has a first fixing portion (31) passing through the second axial through hole (22), and the shock absorbing body (4) has a first shock absorbing portion (41) passing through the first gap and a second shock absorbing portion (42) passing through the first axial through hole (21); the outer iron core (2) comprises a plurality of iron core sub-bodies (23) arranged at intervals along the circumference of the inner iron core (1), the plurality of first axial through holes (21) are respectively located on the iron core sub-bodies (23) in a one-to-one correspondence, and the plurality of second axial through holes (22) are respectively located on the iron core sub-bodies (23), and the plurality of second axial through holes (22) are respectively located on the iron core sub-bodies (23). The magnetic steel grooves (7) are respectively located on the iron core sub-bodies (23) in a one-to-one correspondence; a radial magnetic steel groove (7) is formed between two adjacent iron core sub-bodies (23); a magnetic steel (6) is installed in the radial magnetic steel groove (7); the axial length of the magnetic steel (6) is shorter than the axial length of the outer iron core (2) so as to form a first groove (72) at the axial first end of the motor rotor; the fixed body (3) has a first fixed end (33) corresponding to the axial first end of the motor rotor; the first fixed end (33) has a first connecting portion (331) located in the first groove (72); and / or the axial length of the magnetic steel (6) is shorter than the axial length of the outer iron core (2) so as to form a second groove at the axial second end of the motor rotor; the fixed body (3) has a second fixed end (34) corresponding to the axial second end of the motor rotor; the second fixed end (34) has a second connecting portion (341) located in the second groove.

2. The motor rotor according to claim 1, characterized in that: The fixed body (3) has a second fixed portion (32) passing through the first gap, and when projected onto any radial plane of the inner core (1), a staggered concave-convex structure gap (5) is formed between the inner core (1) and the second fixed portion (32), and the first damping portion (41) is filled in the concave-convex structure gap (5).

3. The motor rotor according to claim 2, characterized in that: The second fixing portion (32) is cylindrical, and has a plurality of first convex strips (321) extending radially toward one side of the inner core (1); the outer peripheral wall of the inner core (1) has a plurality of second convex strips (11) extending radially toward one side of the outer core (2); at least one of the plurality of first convex strips (321) is located between two adjacent plurality of second convex strips (11).

4. The motor rotor according to claim 1, characterized in that: The first fixed end portion (33) further comprises a first ring portion (332) corresponding to the second axial through hole (22), the first ring portion (332) protrudes from the end surface of the first axial end, and the first fixed portion (31) and the second fixed portion (32) are connected as a whole via the first ring portion (332) and the first connecting portion (331); and / or the second fixed end portion (34) further comprises a second ring portion (342) corresponding to the second axial through hole (22), the second ring portion (342) protrudes from the end surface of the second axial end, and the first fixed portion (31) and the second fixed portion (32) are connected as a whole via the second ring portion (342) and the second connecting portion (341).

5. The motor rotor according to claim 4, characterized in that: The shock absorbing body (4) further comprises a first shock absorbing end portion (43) corresponding to the first axial end, the first shock absorbing end portion (43) connects the first shock absorbing portion (41) and the second shock absorbing portion (42) as a whole, and the first shock absorbing end portion (43) is located radially inside the first ring portion (332) and can cover the first connecting portion (331); and / or the shock absorbing body (4) further comprises a second shock absorbing end portion (44) corresponding to the second axial end, the second shock absorbing end portion (44) connects the first shock absorbing portion (41) and the second shock absorbing portion (42) as a whole, and the second shock absorbing end portion (44) is located radially inside the second ring portion (342) and can cover the second connecting portion (341).

6. The motor rotor according to claim 5, characterized in that: The radial magnetic steel slot (7) has a radial opening (71) facing the radial outside of the inner iron core (1), and the radial opening (71) is filled with a third fixing portion (35), and the axial first end of the third fixing portion (35) is connected to the first ring portion (332) as a whole, and / or the axial second end of the third fixing portion (35) is connected to the second ring portion (342) as a whole.

7. A motor, characterized in that: A motor rotor comprising the motor rotor according to any one of claims 1 to 6.

8. An air conditioner, characterized in that: Comprising the motor as claimed in claim 7.

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