CN113489193B

CN113489193B - Motor rotor, motor and air conditioner

Info

Publication number: CN113489193B
Application number: CN202110886628.6A
Authority: CN
Inventors: 高晓峰; 李庆; 陈彬
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Kaibang Motor Manufacture Co Ltd; Henan Kaibang Motor Co Ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-07-22
Anticipated expiration: 2041-08-03
Also published as: CN113489193A

Abstract

The invention provides a motor rotor, a motor and an air conditioner, wherein the motor rotor comprises an inner iron core and an outer iron core, a first gap filled with a second damping body is formed between the outer iron core and the inner iron core, the outer iron core at least comprises a first iron core section and a second iron core section, a first axial circulating part is arranged on the first iron core section, the first axial circulating part extends around the inner iron core to enable the circumferential direction of the outer iron core to be communicated, a second axial circulating part is arranged on the second iron core section, the first axial circulating part is communicated with the second axial circulating part in the axial direction, and the first damping body is filled in the first axial circulating part and the second axial circulating part. According to the motor rotor, the supporting strength and the connecting strength of the first damping body to the outer iron core can be greatly improved, the damping effect of the whole motor rotor is further improved, 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.

Description

Motor rotor, motor and air conditioner

Technical Field

The invention 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.

Disclosure of Invention

Therefore, the invention 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 and an outer core, where the outer core is disposed around a circumferential direction of the inner core, a first gap is formed between the outer core and the inner core, a second damper is filled in the first gap, the outer core at least includes a first core segment and a second core segment located at least at one end of the first core segment along an axial direction of the inner core, the first core segment has a first axial circulation portion, the first axial circulation portion extends around the inner core to form communication in the circumferential direction of the outer core, the second core segment has a second axial circulation portion, the first axial circulation portion and the second axial circulation portion are axially communicated, and the first axial circulation portion and the second axial circulation portion are filled with the first damper.

Preferably, the first core segment includes a plurality of first core sub-bodies arranged at intervals along the circumferential direction of the inner core, the plurality of first axial circulating portions are respectively located on the plurality of first core sub-bodies in a one-to-one correspondence manner, the second core segment includes a plurality of second core sub-bodies, and the plurality of second core sub-bodies and the plurality of first core sub-bodies are in a one-to-one correspondence manner in the axial direction of the inner core; and/or the axial first end of the second shock absorber is connected with the axial first end of the first shock absorber into a whole; and/or the axial second end of the second shock absorber body is connected with the axial second end of the first shock absorber body into a whole.

Preferably, form radial magnetism steel slot between two adjacent first iron core daughter and two adjacent second iron core daughter, the magnet steel is equipped with in the magnet steel slot, the magnet steel has the magnet steel through-hole on the magnet steel, the magnet steel through-hole link up two sides of circumference of magnet steel and with first axial circulation portion is in form the intercommunication in the circumference of interior iron core.

Preferably, the magnetic steel slot has a radial opening facing the radial outer side of the inner core, a third damper is filled in the radial opening, an axial first end of the third damper is integrally connected with an axial first end of the first damper, and/or an axial second end of the third damper is integrally connected with an axial second end of the first damper.

Preferably, the first axial circulation part includes a void-free region dividing the first core sub-body into an outer portion far from the inner core and an inner portion near the inner core, and the second axial circulation part includes at least one second through hole.

Preferably, the outer side portion has a third axial circulating portion, the second core sub-body further has a fourth axial circulating portion, the third axial circulating portion and the fourth axial circulating portion are communicated in the axial direction of the inner core, and the third axial circulating portion and the fourth axial circulating portion are filled with a second damper.

Preferably, the third axial flow-through comprises at least one first through hole and the fourth axial flow-through comprises at least one third through hole.

Preferably, the axial first end of the fourth shock absorber is connected with the axial first end of the first shock absorber into a whole; and/or the axial second end of the fourth shock absorber is connected with the axial second end of the first shock absorber into a whole.

The invention also provides a motor which comprises the motor rotor.

The invention also provides an air conditioner which comprises the motor.

According to the motor rotor, the motor and the air conditioner, the first axial circulation part can be communicated in the circumferential direction of the outer iron core, and the first shock absorbers are filled in the first axial circulation part and the second axial circulation part, so that the supporting strength and the connecting strength of the first shock absorbers to the outer iron core can be greatly improved, the shock absorption effect of the whole motor rotor is further improved, 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 cross-sectional view of a rotor of an electric machine according to an embodiment of the present invention;

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

fig. 3 is an assembly view of the first core body and the two second core bodies shown in fig. 1;

fig. 4 is a schematic structural view of the rotor of the motor of fig. 1 when the damper is not filled (a portion of the second core body is omitted);

fig. 5 is a cross-sectional view of the radial plane of fig. 1 at the first core sub-body.

The reference numerals are represented as:

1. an inner core; 2. an outer core; 211. a void avoidance area; 212. a first through hole; 221. a second through hole; 222. a third through hole; 23. a first core sub-body; 231. an outer portion; 232. an inner portion; 24. a second core sub-body; 31. a first damper; 32. a second damper; 33. a third damper body; 34. a fourth damper; 4. a magnetic steel groove; 41. a radial opening; 5. magnetic steel; 51. and magnetic steel through holes.

Detailed Description

Referring to fig. 1 to 5 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 and an outer core 2, where the outer core 2 is disposed around a circumferential direction of the inner core 1, and a first gap, specifically a gap around the inner core 1, is provided between the outer core 2 and the inner core 1, the first gap is filled with a second damper 32, and along an axial direction of the inner core 1, the outer core 2 at least includes a first core segment and a second core segment at least one end of the first core segment, the first core segment has a first axial through part thereon, the first axial through part extends around the inner core 1 to communicate a circumferential direction of the outer core 2, the second core segment has a second axial through part thereon, and the first axial through part and the second axial through part are axially communicated, the first and second axial flow portions are filled with a first damper body 31. In this technical scheme, first axial circulation portion can form the intercommunication in the circumference of outer iron core 2, just first axial circulation portion second axial circulation portion is internal all to be filled with first damper 31, can greatly promote first damper 31 to outer iron core 2's support intensity and joint strength, and then promoted whole electric motor rotor's shock attenuation effect, effectively avoided electric motor rotor's weight to concentrate on outer iron core 2 can understand as the rotor outer lane and lead the actuating balance poor, intensity subalternation problem among the prior art, promote electric motor rotor's whole dynamic balance and stability.

In some embodiments, the first core segment includes a plurality of first core sub-bodies 23 arranged at intervals along the circumferential direction of the inner core 1, a plurality of the first axial circulating portions are respectively located on the plurality of first core sub-bodies 23 in a one-to-one correspondence, and the second core segment includes a plurality of second core sub-bodies 24, and the plurality of second core sub-bodies 24 and the plurality of first core sub-bodies 23 are located in a one-to-one correspondence in the axial direction of the inner core 1. In this technical scheme, first iron core section and second iron core section are all formed by the iron core daughter amalgamation of a plurality of correspondences, at this moment, pass through between a plurality of iron core daughter first shock absorber 31 is formed effective shock attenuation location and is fixed, effectively prevents a plurality of iron core daughter among the correlation technique and only leads to inside and outside iron core dislocation, support the emergence of the not enough dynamic balance subalternation problem of intensity through the limited radial inner wall of area in the shock attenuation connection between the radial outer wall of inner circle iron core (also interior iron core 1).

In some embodiments, form radial magnetism steel slot 4 between two adjacent first iron core daughter 23 and two adjacent second iron core daughter 24, magnetism steel slot 4 traditional chinese clothing is equipped with magnet steel 5, magnet steel 5 is last to have magnet steel through-hole 51, magnet steel through-hole 51 link up two sides of the circumference of magnet steel 5 and with first axial circulation is in form the intercommunication in the circumference of interior iron core 1, it can be understood that first damper 31 will pass through each after filling magnet steel through-hole 51 is in form a closed annular in the circumference of interior iron core 1, promote joint strength and the shock attenuation effect to magnet steel 5, each iron core daughter.

The magnet steel slot 4 has the orientation the radial opening 41 in the radial outside of interior iron core 1, radial opening 41 intussuseption is filled with third damper 33, the axial first end of third damper 33 with the axial first end of first damper 31 is connected as an organic wholely, and/or, the axial second end of third damper 33 with the axial second end of first damper 31 is connected as an organic wholely. In this technical scheme, third damper 33 can be to being in the radial outer terminal surface of magnet steel 5 in the magnet steel groove 4 forms effective shock attenuation and supports, can further promote electric motor rotor overall structure's joint strength and shock attenuation effect.

In some embodiments, the first axial circulation portion includes a clearance area 211, the clearance area 211 divides the first iron core sub-body 23 into an outer portion 231 far away from the inner iron core 1 and an inner portion 232 close to the inner iron core 1, the second axial circulation portion includes at least one second through hole 221, and it is understood that the clearance area 211 may be a fan-ring area corresponding to each first iron core sub-body 23.

Preferably, the outer portion 231 has a third axial circulation portion, the second core sub-body 24 further has a fourth axial circulation portion, the third and fourth axial circulation portions are in communication with each other in the axial direction of the inner core 1, and the third and fourth axial circulation portions are filled with the second damper 32. The connection strength and the damping effect to the outer core 2 can be further improved by filling the second damper 32. In some embodiments, the third axial flow-through comprises at least one first through hole 212 and the fourth axial flow-through comprises at least one third through hole 222.

Preferably, the first axial end of the fourth damper body 34 is connected with the first axial end of the first damper body 31 as a whole; and/or, the axial second end of the fourth damper 34 is connected with the axial second end of the first damper 31 into a whole, that is, the corresponding end portions of the first damper 31 and the fourth damper 34 form an end connection portion at two ends of the motor rotor, so that the overall strength, reliability and stability of the damping structure can be further improved, and the damping effect of the motor rotor is further improved; and/or, the axial first end of the second damper body 32 is connected with the axial first end of the first damper body 31 into a whole; and/or, the axial second end of the second damper body 32 is integrally connected with the axial second end of the first damper body 31. It should be particularly noted that, in this case, the first damper 31, the second damper 32, the third damper 33, and the fourth damper 34 together form an integrated cage damper, and the reliable damping connection from the radial inner side to the radial outer side and from one axial end to the other axial end of the motor rotor effectively prevents the occurrence of the problem that the rotor structure is dislocated and the dynamic balance is reduced due to the excessive centrifugal force caused by the weight of the motor rotor being concentrated on the outer ring of the rotor (i.e., the side close to the outer iron core 2). The first damper 31, the second damper 32, the third damper 33, and the fourth damper 34 are formed as an organic whole by injection molding.

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 inner iron core, the outer iron core and the magnetic steel in an injection mold;

the fifth step: high-temperature injection molding, namely, the shock absorbers (i.e., the first shock absorber 31, the second shock absorber 32, the third shock absorber 33, the fourth shock absorber 34 and the corresponding axial ends) are integrally injection molded according to a designed structure;

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

the third step: sequentially arranging the inner iron core, the outer iron core and the magnetic steel in an injection mold;

the fourth step: high-temperature injection molding, namely, integrally injecting the shock absorber according to a designed structure;

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

According to an embodiment of the invention, 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

1. The motor rotor is characterized by comprising an inner iron core (1) and an outer iron core (2), wherein the outer iron core (2) is arranged around the circumferential direction of the inner iron core (1), a first gap is formed between the outer iron core (2) and the inner iron core (1), a second damping body (32) is filled in the first gap, the outer iron core (2) at least comprises a first iron core section and a second iron core section at least arranged at one end of the first iron core section along the axial direction of the inner iron core (1), a first axial circulating part is arranged on the first iron core section, the first axial circulating part extends around the inner iron core (1) to enable the circumferential direction of the outer iron core (2) to be communicated, a second axial circulating part is arranged on the second iron core section, the first axial circulating part is communicated with the second axial circulating part in the axial direction, and the first axial circulating part, A first damper (31) is filled in the second axial flow part; the first iron core section comprises a plurality of first iron core sub-bodies (23) which are arranged along the circumferential direction of the inner iron core (1) at intervals, the first axial circulating parts are respectively arranged on the first iron core sub-bodies (23) in a one-to-one correspondence mode, the second iron core section comprises a plurality of second iron core sub-bodies (24), and the second iron core sub-bodies (24) and the first iron core sub-bodies (23) are in one-to-one correspondence mode in the axial direction of the inner iron core (1); form radial magnet steel groove (4) between two adjacent first iron core daughter (23) and two adjacent second iron core daughter (24), magnet steel (5) are equipped with in magnet steel groove (4), magnet steel through-hole (51) have on magnet steel (5), magnet steel through-hole (51) link up two sides of circumference of magnet steel (5) and with first axial circulation is in form the intercommunication in the circumference of interior iron core (1).

2. The electric machine rotor according to claim 1, characterized in that the first axial end of the second damper body (32) is connected in one piece with the first axial end of the first damper body (31); and/or the axial second end of the second shock absorber body (32) is connected with the axial second end of the first shock absorber body (31) into a whole.

3. The electric machine rotor according to claim 2, characterized in that the magnet steel slots (4) have radial openings (41) facing radially outwards of the inner core (1), the radial openings (41) being filled with third damper bodies (33), the axial first ends of the third damper bodies (33) being integrally connected with the axial first ends of the first damper bodies (31), and/or the axial second ends of the third damper bodies (33) being integrally connected with the axial second ends of the first damper bodies (31).

4. An electric machine rotor according to claim 2, characterized in that the first axial flux comprises a clearance area (211), the clearance area (211) dividing the first core sub-body (23) into an outer part (231) distal from the inner core (1) and an inner part (232) proximal to the inner core (1), the second axial flux comprising at least one second through hole (221).

5. The electric machine rotor according to claim 4, characterized in that the outer part (231) has a third axial flow portion, the second core sub-body (24) further has a fourth axial flow portion, the third and fourth axial flow portions communicate in the axial direction of the inner core (1), and the third and fourth axial flow portions are filled with a fourth damper body (34).

6. An electric machine rotor, according to claim 5, characterized in that said third axial through flow comprises at least one first through hole (212) and said fourth axial through flow comprises at least one third through hole (222).

7. An electric machine rotor, according to claim 5, characterised in that the axial first end of said fourth damper body (34) is connected in one piece with the axial first end of said first damper body (31); and/or the axial second end of the fourth damper body (34) is connected with the axial second end of the first damper body (31) into a whole.

8. An electrical machine comprising an electrical machine rotor according to any one of claims 1 to 7.

9. An air conditioner characterized by comprising the motor of claim 8.