CN215419790U - Motor rotor, motor and air conditioner - Google Patents

Abstract

The utility model provides a motor rotor, a motor and an air conditioner, wherein the motor rotor comprises an inner iron core and an outer iron core, the outer iron core is arranged around the circumference of the inner iron core, a first gap is formed between the outer iron core and the inner iron core, a first axial through hole close to the inner iron core and a second axial through hole far away from the inner iron core are arranged on the outer iron core, the motor rotor further comprises a fixing body and a damping body, the fixing body is provided with a first fixing part penetrating through the second axial through hole, and the damping body is provided with a first damping part penetrating through the first gap and a second damping part penetrating through the first axial through hole. According to the utility model, the fixing body can reliably position the outer iron core in the axial direction and the radial direction through the first fixing part, and meanwhile, the damping body improves the damping effect of the whole motor rotor through the first damping part and the second damping part, so that the problems of poor dynamic balance, poor strength and the like caused by the fact that the weight of the motor rotor is concentrated on the outer iron core in the prior art are effectively avoided, and the whole dynamic balance and the stability of the motor rotor are improved.

Description

Motor rotor, motor and air conditioner

Technical Field

The utility model belongs to the technical field of motor manufacturing, and particularly relates to a motor rotor, a motor and an air conditioner.

Background

With the guidance of government energy-saving policies and the demand of market development, the direct-current flow of the fan of the household appliance gradually becomes a trend, and the brushless motor adopted in the industry at present is of a radial magnetic field surface-mounted structure, so that the power density of the motor is low and the material utilization rate is low.

Due to the market price rise of motor raw materials, the high-power density motor becomes the development trend of the brushless direct current motor. In the permanent magnet motor, in order to improve the motor performance, higher rotor magnetic performance is generally required to be obtained, and under a limited structure, compared with a surface-mounted rotor and an embedded radial rotor, the built-in tangential rotor structure can effectively increase the magnetic flux area, improve the effective air gap magnetic flux and further improve the motor performance. However, the dynamic balance and the anti-armature reaction of the motor with the embedded tangential magnetic field rotor structure are poorer than those of a motor with a surface-mounted rotor, the load torque pulsation is larger, and the noise is easily generated by the motor, a motor mounting bracket and the wind blade resonance. Because the iron core and the magnet steel of embedded tangential magnetic field rotor distribute in the outer lane, and in order to guarantee the size of magnet steel to walk to take, the magnet steel will be close to near the inner circle as far as possible along radial, this makes the inner circle space limited, and the traditional shock attenuation measure of designing at the inner circle of trade uses elastic material can lead to rotor dynamic balance variation because of rotor weight mainly concentrates on the outer lane, can't reach actual vibration/noise reduction effect.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a motor rotor, a motor and an air conditioner, which can overcome the defects that an outer iron core is lack of damping support and positioning, the dynamic balance of the rotor is poor and the damping effect is poor in the related technology.

In order to solve the above problems, the present invention provides a motor rotor, including an inner core, an outer core, a fixing body, and a damping body, wherein the outer core is disposed around a circumference of the inner core, a first gap is formed between the outer core and the inner core, the outer core has a first axial through hole close to the inner core and a second axial through hole far away from the inner core, the fixing body has a first fixing portion passing through the second axial through hole, and the damping body has a first damping portion passing through the first gap and a second damping portion passing through the first axial through hole.

Preferably, the fixing 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 damping portion is filled in the concave-convex structure gap.

Preferably, the second fixing portion is cylindrical, the second fixing portion has a plurality of first protruding strips extending in a radial direction toward one side of the inner core, the outer peripheral wall of the inner core has a plurality of second protruding strips extending in a radial direction toward one side of the outer core, and at least one of the plurality of first protruding strips is located between two adjacent second protruding strips.

Preferably, the outer iron core includes a plurality of along the iron core daughter that the circumference interval of interior iron core set up, it is a plurality of first axial through-hole is in respectively the one-to-one on the iron core daughter, it is a plurality of second axial through-hole is in respectively the one-to-one on the iron core daughter.

Preferably, form radial magnet steel slot between two adjacent iron core daughter, radial magnet steel slot centre dress is equipped with the magnet steel, the axial length of magnet steel is in order to be in the axial length of outer iron core the first end of electric motor rotor's axial forms first recess, the fixed body has the correspondence the first fixed tip of electric motor rotor's axial first end, first fixed tip has and is in first connecting portion in the first recess, and/or, the axial length of magnet steel is in order to be in the axial length of outer iron core the electric motor rotor's axial second end forms the second recess, the fixed body has the correspondence the second fixed tip of electric motor rotor's axial second end, the second fixed tip has and is in the second connecting portion in the second recess.

Preferably, the first fixing end part is further provided with a first ring part corresponding to the second axial through hole, the first ring part protrudes out of the end face of the first end in the axial direction, and the first fixing part and the second fixing part are connected into a whole through the first ring part and the first connecting part; and/or the second fixed end part is also provided with a second ring part corresponding to the second axial through hole, the second ring part protrudes out of the end face of the second axial end, and the first fixed part and the second fixed part are connected into a whole through the second ring part and the second connecting part.

Preferably, the damper body further has a first damper end portion corresponding to the first axial end, the first damper end portion connects the first damper portion and the second damper portion together, and the first damper end portion is located on a radially inner side of the first ring portion and can cover the first connecting portion; and/or the damping body is also provided with a second damping end part corresponding to the axial second end, the second damping end part connects the first damping part and the second damping part into a whole, and the second damping end part is positioned at the radial inner side of the second ring part and can cover the second connecting part.

Preferably, radial magnet steel groove has the orientation the radial opening in the radial outside of interior iron core, radial opening intussuseption is filled with the third fixed part, the axial first end of third fixed part with first ring portion connects as an organic wholely, and/or, the axial second end of third fixed part with second ring portion connects as an organic wholely.

The utility model also provides a motor which comprises the motor rotor.

The utility model also provides an air conditioner which comprises the motor.

According to the motor rotor, the motor and the air conditioner, the fixing body can reliably position the outer iron core in the axial direction and the radial direction through the first fixing part, meanwhile, the damping body improves the damping effect of the whole motor rotor through the first damping part and the second damping part, the problems of poor dynamic balance, poor strength and the like caused by the fact that the weight of the motor rotor is concentrated on the outer iron core in the prior art are effectively solved, and the overall dynamic balance and the stability of the motor rotor are improved.

Drawings

Fig. 1 is a schematic axial sectional view of a rotor of an electric motor according to an embodiment of the present invention (a section passing through a radial symmetry plane of magnetic steel and a radial symmetry plane of a first axial through hole and a rotor axis);

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a schematic axial projection of the rotor of the machine of FIG. 1 (before the damper is filled);

fig. 4 is a schematic perspective view of the rotor of the motor shown in fig. 3 (the fixing body and the damper are not shown).

The reference numerals are represented as:

1. an inner core; 11. a second convex strip; 2. an outer core; 21. a first axial through hole; 22. a second axial through hole; 23. an iron core sub-body; 3. a fixed body; 31. a first fixed part; 32. a second fixed part; 321. a first rib; 33. a first fixed end portion; 331. a first connection portion; 332. a first ring portion; 34. a second fixed end; 341. a second connecting portion; 342. a second ring portion; 35. a third fixed part; 4. a shock absorber; 41. a first damper section; 42. a second damper portion; 43. a first shock absorbing end portion; 44. a second shock absorbing end portion; 5. a relief structure gap; 6. magnetic steel; 7. a radial magnetic steel slot; 71. a radial opening; 72. a first groove.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, there is provided a motor rotor, especially a motor permanent magnet rotor with an embedded tangential magnetic field structure, including an inner core 1, an outer core 2, the outer core 2 is disposed around a circumference of the inner core 1, a first gap is formed between the outer core 2 and the inner core 1, the outer core 2 has a first axial through hole 21 close to the inner core 1 and a second axial through hole 22 far from the inner core 1, and further includes a fixing body 3 and a damper 4, the fixing body 3 has a first fixing portion 31 passing through the second axial through hole 22, and the damper 4 has a first damper portion 41 passing through the first gap and a second damper portion 42 passing through the first axial through hole 21. In this technical scheme, the fixed body 3 can be right through first fixed part 31 outer iron core 2 forms reliable axial and radial positioning, simultaneously damper 4 then passes through first shock attenuation portion 41 and second shock attenuation portion 42 have promoted whole electric motor rotor's shock attenuation effect, and the weight of effectively having avoided electric motor rotor among the prior art concentrates on outer iron core 2 (can understand as the rotor outer lane) to lead to the poor, poor scheduling problem of intensity of dynamic balance, promotes electric motor rotor's whole dynamic balance and stability.

In some embodiments, the fixing body 3 has a second fixing portion 32 passing through the first gap, and projected on any radial plane of the inner core 1, a concave-convex structure gap 5 is formed between the inner core 1 and the second fixing portion 32, the first shock absorption portion 41 is filled in the concave-convex structure gap 5, specifically, the second fixing portion 32 is cylindrical, the second fixing portion 32 has a plurality of first convex strips 321 extending in a radial direction 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 in a radial direction toward one side of the outer core 2, and at least one of the plurality of first convex strips 321 is located between two adjacent second convex strips 11. In this technical scheme, through concave-convex structure clearance 5 is filled first shock attenuation portion 41 can further promote joint strength between interior iron core 1 and the outer iron core 2, and then guarantees the shock attenuation effect of rotor, and through first sand grip 321 with form between the second sand grip 11 concave-convex structure clearance 5 can reduce right outer iron core 2 orientation the structural design degree of difficulty of interior iron core 1 one side improves production efficiency.

In some embodiments, the outer core 2 includes a plurality of core bodies 23 disposed along the circumferential direction of the inner core 1 at intervals, the first axial through holes 21 are respectively located on the core bodies 23 in a one-to-one correspondence, and the second axial through holes 22 are respectively located on the core bodies 23 in a one-to-one correspondence. In this technical scheme, outer iron core 2 is by a plurality of iron core body 23 amalgamation forms, at this moment, passes through between a plurality of iron core body 23 the fixed body 3 and damper 4 are formed effective location, are fixed and the shock attenuation, effectively prevent a plurality of iron core body in the correlation technique only through the limited radial inner wall of area and the inner circle iron core (also the emergence of the not reliable dynamic balance subalternation problem that leads to inside and outside iron core dislocation, support intensity etc. of shock attenuation connection between the radial outer wall of inner core 1).

In some embodiments, a radial magnetic steel slot 7 is formed between two adjacent iron core sub-bodies 23, the radial magnetic steel slot 7 is internally provided with magnetic steel 6, the axial length of the magnetic steel 6 is shorter than that 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 a first axial end of the rotor of the electric machine, the first fixed end 33 has a first connection 331 in the first recess 72, and/or the axial length of the magnetic steel 6 is shorter than that of the outer iron core 2 so as to form a second groove (not marked in the figure) at the axial second end of the motor rotor, the fixed body 3 has a second fixed end 34 corresponding to the second axial end of the rotor of the machine, the second fixed end 34 has a second connection 341 in the second recess. In the technical scheme, a plurality of first grooves 72 and second grooves are reserved at two axial ends of the radial magnetic steel slot 7 respectively, so that the first connecting portion 331 and the second connecting portion 341 can be located in the corresponding grooves respectively, the integration of the structure of the fixing body 3 is realized, the reduction of the axial length of the motor rotor is facilitated, and the design requirements of miniaturization and compactness of the motor can be met particularly.

In some embodiments, the first fixing 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 an end surface of the first axial end, and the first fixing portion 31 and the second fixing portion 32 are integrally connected through the first ring portion 332 and the first connecting portion 331; and/or the second fixing end portion 34 further has a second annular portion 342 corresponding to the second axial through hole 22, the second annular portion 342 protrudes from an end surface of the second axial end, and the first fixing portion 31 and the second fixing portion 32 are connected into a whole through the second annular 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 a convex ring structure protruding from the corresponding axial end surface of the motor rotor, so that an edge positioning structure of an internal structure can be formed.

In some embodiments, the damper body 4 further has a first damper end portion 43 corresponding to the first axial end, corresponding to the first ring portion 332 and the second ring portion 342, the first damper end portion 43 integrally connects the first damper portion 41 and the second damper portion 42, and the first damper end portion 43 is located radially inside the first ring portion 332 and can cover the first connecting portion 331; and/or, the damper body 4 further has a second damper end portion 44 corresponding to the second axial end, the second damper end portion 44 connects the first damper portion 41 and the second damper portion 42 into a whole, and the second damper end portion 44 is located at the radially inner side of the second ring portion 342 and can cover the second connecting portion 341, it can be understood that the outer peripheral edge of the first damper end portion 43 is defined by the first ring portion 332, and the outer peripheral edge of the second damper end portion 44 is defined by the second ring portion 342, so as to facilitate the injection molding of the damper body 4.

In some embodiments, the radial magnetic steel slot 7 has a radial opening 71 facing the radial outside of the inner core 1, the radial opening 71 is filled with a third fixing portion 35, an axial first end of the third fixing portion 35 is integrally connected to the first ring portion 332, and/or an axial second end of the third fixing portion 35 is integrally connected to the second ring portion 342. In this technical scheme, third fixed part 35 can be to being in the radial outer terminal surface of magnet steel 6 in radial magnet steel groove 7 forms effective fixed stay, can further promote electric motor rotor overall structure's joint strength and shock attenuation effect.

It should be particularly noted that, at this time, the axial two ends of the first damping portion 41 and the second damping portion 42 respectively form an integrated cage-shaped damping body (an organic whole is formed by injection molding) through the first damping end portion 43 and the second damping end portion 44, and the motor rotor is reliably connected from the radial inner side to the radial outer side and from one axial end to the other axial end in a damping manner, so that the problem that the rotor structure is dislocated and the dynamic balance is reduced due to the fact that the weight of the motor rotor is concentrated on the outer ring of the rotor (i.e., the side close to the outer iron core 2) and the centrifugal force is too large is effectively prevented. Similarly, the first fixing portion 31, the second fixing portion 32, and the third fixing portion 35 form an integrated cage-shaped damper through the first fixing end portion 33 and the second fixing end portion 34 (an organic whole is formed by injection molding). It should be understood that, although both the damping body 4 and the fixing body 3 can be formed by filling injection molding, the specific material selection is different, and for example, the material selected for the damping body 4 may be rubber, and the material selected for the fixing body 3 may be plastic material such as nylon, PBT, etc.

The motor rotor can be assembled and processed in the following way:

the first step is as follows: laminating the silicon steel sheet into an outer iron core and an inner iron core by using a stamping die;

the second step is that: die-casting the magnetic powder into corresponding magnetic steel by using a die-casting mold;

the third step: magnetizing the magnetic steel;

the fourth step: sequentially arranging the outer iron core and the magnetic steel in an injection mold, performing high-temperature injection molding, forming the fixed body according to a designed structure, and fixedly forming the outer iron core and the magnetic steel (forming a plastic-coated rotor part);

the fifth step: the plastic-coated rotor part and the inner iron core are arranged in an injection mold, high-temperature injection molding is carried out, and the shock absorption body is integrally injected according to a design structure;

further, the third, fourth and fifth steps can also be adjusted according to actual production, such as:

the third step: sequentially arranging the outer iron core and the magnetic steel in an injection mold, performing high-temperature injection molding, forming the fixed body according to a designed structure, and fixedly forming the outer iron core and the magnetic steel (forming a plastic-coated rotor part);

the fourth step: the plastic-coated rotor part and the inner iron core are arranged in an injection mold, high-temperature injection molding is carried out, and the shock absorption body is integrally injected according to a design structure;

the fifth step: and post-magnetizing the injection molded integrated rotor.

According to an embodiment of the utility model, there is also provided a motor including the motor rotor described above.

According to an embodiment of the present invention, there is also provided an air conditioner including the motor described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. The utility model provides a motor rotor, its characterized in that, includes inner core (1), outer core (2) encircle the circumference setting of inner core (1) just outer core (2) with first clearance has between inner core (1), outer core (2) are gone up to have and are close to first axial through-hole (21) of inner core (1) and keep away from second axial through-hole (22) of inner core (1), still include fixed body (3), shock attenuation body (4), fixed body (3) have walk in first fixed part (31) of second axial through-hole (22), shock attenuation body (4) have walk in first shock attenuation portion (41) of first clearance and walk in second shock attenuation portion (42) of first axial through-hole (21).

2. The electric machine rotor according to claim 1, characterized in that the fixed body (3) has a second fixed part (32) passing through the first gap, projected on any radial plane of the inner core (1), concave-convex structure gaps (5) are formed between the inner core (1) and the second fixed part (32) and staggered with each other, and the first damping part (41) is filled in the concave-convex structure gaps (5).

3. The electric machine rotor according to claim 2, characterized in that the second fixing portion (32) is cylindrical, the second fixing portion (32) has a plurality of first ribs (321) extending in a radial direction toward one side of the inner core (1), the outer peripheral wall of the inner core (1) has a plurality of second ribs (11) extending in a radial direction toward one side of the outer core (2), and at least one of the plurality of first ribs (321) is located between two adjacent pluralities of second ribs (11).

4. The electric machine rotor as recited in claim 2, wherein the outer core (2) comprises a plurality of core sub-bodies (23) arranged at intervals along the circumferential direction of the inner core (1), the plurality of first axial through holes (21) are respectively located on the core sub-bodies (23) in a one-to-one correspondence, and the plurality of second axial through holes (22) are respectively located on the core sub-bodies (23) in a one-to-one correspondence.

5. An electric machine rotor according to claim 4, characterized in that a radial magnetic steel slot (7) is formed between two adjacent core bodies (23), a magnetic steel (6) is arranged in the radial magnetic steel slot (7), the axial length of the magnetic steel (6) is shorter than the axial length of the outer core (2) so as to form a first groove (72) at the first axial end of the electric machine rotor, the fixing body (3) has a first fixing end portion (33) corresponding to the first axial end of the electric machine rotor, the first fixing end portion (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 core (2) so as to form a second groove at the second axial end of the electric machine rotor, the fixing body (3) has a second fixing end portion (34) corresponding to the second axial end of the electric machine rotor, the second fixed end (34) has a second connection (341) in the second recess.

6. The electric machine rotor according to claim 5, characterized in that the first fixing end part (33) further has a first ring part (332) corresponding to the second axial through hole (22), the first ring part (332) protrudes from the end face of the first axial end, and the first fixing part (31) and the second fixing part (32) are connected into a whole through the first ring part (332) and the first connecting part (331); and/or the second fixing end part (34) is also provided with a second ring part (342) corresponding to the second axial through hole (22), the second ring part (342) protrudes out of the end surface of the axial second end, and the first fixing part (31) and the second fixing part (32) are connected into a whole through the second ring part (342) and the second connecting part (341).

7. The electric machine rotor according to claim 6, characterized in that the damper body (4) further has a first damper end portion (43) corresponding to the axial first end, the first damper end portion (43) integrally connecting the first damper portion (41) and the second damper portion (42), and the first damper end portion (43) being radially inside the first ring portion (332) and capable of covering the first connecting portion (331); and/or the damper body (4) further has a second damper end portion (44) corresponding to the second axial end, the second damper end portion (44) integrally connects the first damper portion (41) and the second damper portion (42), and the second damper end portion (44) is located radially inside the second ring portion (342) and can cover the second connecting portion (341).

8. An electric machine rotor according to claim 7, characterised in that the radial magnet steel slot (7) has a radial opening (71) towards the radial outside of the inner core (1), the radial opening (71) being filled with a third fixing portion (35), an axial first end of the third fixing portion (35) being integrally connected with the first ring portion (332) and/or an axial second end of the third fixing portion (35) being integrally connected with the second ring portion (342).

9. An electrical machine comprising an electrical machine rotor according to any one of claims 1 to 8.

10. An air conditioner characterized by comprising the motor of claim 9.

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