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, the outer iron core is arranged around the circumference of the inner iron core and there is a first gap between the outer iron core and the inner iron core, the first gap is filled with a second shock absorber, along the axial direction of the inner iron core, the outer iron core at least includes a first iron core segment and a second iron core segment, the first iron core segment has a first axial flow portion, the second iron core segment has a second axial flow portion, the first axial flow portion and the second axial flow portion are connected in the axial direction, and the flow cross-sectional area of ​​the first axial flow portion is not equal to the flow cross-sectional area of ​​the second axial flow hole, and the first axial flow portion and the second axial flow portion are filled with a first shock absorber. According to the present invention, the first shock absorber can form a step surface structure, which improves the support strength and connection strength of the first shock absorber to the outer iron core, thereby improving the shock absorption effect of the entire motor rotor, that is, 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 first gap is filled with a second shock-absorbing body, along the axial direction of the inner iron core, the outer iron core at least includes a first iron core segment and a second iron core segment at at least one end of the first iron core segment, the first iron core segment has a first axial flow portion, the second iron core segment has a second axial flow portion, the first axial flow portion and the second axial flow portion are connected in the axial direction, and the flow cross-sectional area of ​​the first axial flow portion is not equal to the flow cross-sectional area of ​​the second axial flow hole, and the first axial flow portion and the second axial flow portion are filled with a first shock-absorbing body.

[0006] Preferably, the first axial end of the second shock-absorbing body is connected to the first axial end of the first shock-absorbing body as a whole, and / or the second axial end of the second shock-absorbing body is connected to the second axial end of the first shock-absorbing body as a whole.

[0007] Preferably, the first core segment includes a plurality of first core sub-bodies arranged at intervals along the circumference of the inner core, and a plurality of the first axial flow parts are respectively and one-to-one located on the plurality of first core sub-bodies, and the second core segment includes a plurality of second core sub-bodies, and the plurality of the second core sub-bodies correspond one-to-one to the plurality of the first core sub-bodies in the axial direction of the inner core.

[0008] Preferably, the first axial circulation portion includes at least one first through hole, and the second axial circulation portion includes at least one second through hole, and when projected on any radial surface of the inner core, there is an overlapping portion between the first through hole and the second through hole.

[0009] Preferably, the first axial circulation portion includes one first through hole, and the second axial circulation portion includes two second through holes, the two second through holes are arranged at intervals along the radial direction of the inner iron core, and when projected on any radial surface of the inner iron core, the projection of the two second through holes is covered by the projection of the first through hole.

[0010] Preferably, the first axial circulation portion includes two first through holes, and the second axial circulation portion includes two second through holes, the two first through holes are arranged at intervals along the circumference of the inner iron core, and the two second through holes are arranged at intervals along the axial direction of the inner iron core, a first rib is formed between the two first through holes, and a second rib is formed between the two second through holes, and when projected on any radial surface of the inner iron core, the first rib and the second rib form an intersection.

[0011] Preferably, the first axial circulation portion includes one first through hole, which is a T-shaped hole, and the second axial circulation portion includes three second through holes, which are arranged in a T shape, and projected on any radial surface of the inner iron core, the projection of the three second through holes is covered by the projection of the first through hole.

[0012] Preferably, a radial magnetic steel groove is formed between two adjacent first iron core sub-bodies and two adjacent second iron core sub-bodies, and the radial magnetic steel groove has a radial opening facing the radial outside of the inner iron core, and the radial opening is filled with a third shock absorber, and the axial first end of the third shock absorber is connected as a whole with the axial first end of the first shock absorber, and / or the axial second end of the third shock absorber is connected as a whole with the axial second end of the first shock absorber.

[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. On the one hand, the second shock-absorbing body in the first gap can form a shock-absorbing connection between the inner iron core and the outer iron core in the radial and axial directions. On the other hand, the first shock-absorbing body on the outer iron core greatly improves the supporting strength and connection strength of the first shock-absorbing body to the outer iron core due to the structure of the step surface formed in the axial direction of the inner iron core, thereby improving the shock-absorbing effect of the entire motor rotor, 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 is a schematic diagram of an axial cross-section of a motor rotor according to an embodiment of the present invention;

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

[0018] Figure 3 for Figure 1 A schematic diagram of assembling the first iron core sub-body and the two second iron core sub-bodies;

[0019] Figure 4 for Figure 1 A schematic diagram of the structure of the motor rotor when no damping body is filled;

[0020] Figure 5 A schematic structural diagram of a first iron core sub-body according to an embodiment of the present invention;

[0021] Figure 6 For Figure 5 A schematic structural diagram of a second iron core sub-body matching the first iron core sub-body in the embodiment;

[0022] Figure 7 Another structural schematic diagram of the first iron core sub-body according to an embodiment of the present invention;

[0023] Figure 8 For Figure 7 A schematic structural diagram of a second core sub-body matching the first core sub-body in FIG.

[0024] The reference numerals are:

[0025] 1. Inner iron core; 2. Outer iron core; 211. First through hole; 221. Second through hole; 23. First iron core sub-body; 24. Second iron core sub-body; 31. First shock absorber; 32. Second shock absorber; 33. Third shock absorber; 4. Magnetic steel slot; 41. Radial opening; 5. Magnetic steel. DETAILED DESCRIPTION

[0026] See also Figures 1 to 8As 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 core 1 and an outer core 2, wherein the outer core 2 is arranged around the circumference 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 damping body 32, and along the axial direction of the inner core 1, the outer core 2 at least comprises a first core segment and a second core segment at at least one end of the first core segment, the first core segment has a first axial flow portion, and the second core segment has a second axial flow portion. The first axial flow portion is connected to the second axial flow portion in the axial direction, and the flow cross-sectional area of ​​the first axial flow portion is not equal to the flow cross-sectional area of ​​the second axial flow portion. For example, the flow cross-sectional area of ​​the first axial flow portion is larger than the flow cross-sectional area of ​​the second axial flow hole, or vice versa. The first axial flow portion and the second axial flow portion are filled with a first shock-absorbing body 31. It can be understood that at this time, the first shock-absorbing body 31 has a cross-sectional area in the middle part in the axial direction on a plane perpendicular to the axial direction of the inner iron core 1, and the cross-sectional area will be unequal to the cross-sectional area at both end parts in the cross-sectional area, thereby forming a step surface. In this technical solution, on the one hand, the second shock-absorbing body 32 in the first gap can form a shock-absorbing connection between the inner core 1 and the outer core 2 in the radial and axial directions. On the other hand, the first shock-absorbing body 31 on the outer core 2 greatly improves the supporting strength and connection strength of the first shock-absorbing body 31 to the outer core 2 due to the structure of the step surface formed in the axial direction of the inner core 1, thereby improving the shock-absorbing effect of the entire motor rotor, effectively avoiding the problems of poor dynamic balance and poor strength caused by the weight of the motor rotor being concentrated on the outer core 2 (which can be understood as the outer ring of the rotor) in the prior art, and improving the overall dynamic balance and stability of the motor rotor.

[0027] In some embodiments, the axial first end of the second shock absorber 32 is connected as a whole with the axial first end of the first shock absorber 31, and / or the axial second end of the second shock absorber 32 is connected as a whole with the axial second end of the first shock absorber 31, that is, the corresponding ends of the first shock absorber 31 and the second shock absorber 32 respectively form an end connection portion at both ends of the motor rotor, which can further improve the overall strength, reliability and stability of the shock absorbing structure, and further improve the shock absorbing effect of the motor rotor.

[0028] In some embodiments, the first core segment includes a plurality of first core sub-bodies 23 arranged at intervals along the circumference of the inner core 1, and the plurality of first axial flow 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 correspond to the plurality of first core sub-bodies 23 in the axial direction of the inner core 1. In this technical solution, both the first core segment and the second core segment are formed by splicing a plurality of corresponding core sub-bodies, and at this time, the plurality of core sub-bodies are effectively positioned and fixed by the first damping body 31, which effectively prevents 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 only the radial inner wall with a limited area, resulting in the occurrence of problems such as misalignment of the inner and outer cores, insufficient support strength, and poor dynamic balance.

[0029] As a specific implementation, the first axial circulation portion includes at least one first through hole 211, and the second axial circulation portion includes at least one second through hole 221. When projected on any radial surface of the inner core 1, the first through hole 211 and the second through hole 221 have overlapping parts. More specifically, Figure 3 As shown, the first axial circulation portion includes a first through hole 211, and the second axial circulation portion includes two second through holes 221. The two second through holes 221 are arranged along the radial interval of the inner iron core 1. When projected on any radial surface of the inner iron core 1, the projection of the two second through holes 221 covers the projection of the first through hole 211. It can be understood that a partition rib is sandwiched between the two second through holes 221. After the first shock absorber 31 is filled, the first shock absorber 31 and the partition rib will form an axial positioning. Generally, the specific shapes of the first through hole 211 and the second through hole 221 can be various, and preferably they are all rectangular holes for easy processing and manufacturing.

[0030] like Figure 5 and 6 As shown, as another specific implementation, the first axial circulation portion includes two first through holes 211, the second axial circulation portion includes two second through holes 221, the two first through holes 211 are arranged at intervals along the circumference of the inner core 1, the two second through holes 221 are arranged at intervals along the axial direction of the inner core 1, a first rib is formed between the two first through holes 211, a second rib is formed between the two second through holes 221, and the first rib and the second rib are intersected when projected on any radial surface of the inner core 1. The first damping body 31 will be staggered at the first through hole 211 and the second through hole 221, so as to form a reliable damping connection to the adjacent outer core 2.

[0031] like Figure 7 and 8 As shown, the first axial circulation portion includes a first through hole 211, which is a T-shaped hole, and the second axial circulation portion includes three second through holes 221, which are arranged in a T shape. When projected on any radial surface of the inner core 1, the projection of the three second through holes 221 covers the projection of the first through hole 211. The first damping body 31 will be staggered at the first through hole 211 and the second through hole 221, so as to form a reliable damping connection to the adjacent outer core 2.

[0032] In some embodiments, a radial magnetic steel slot 4 is formed between two adjacent first core sub-bodies 23 and two adjacent second core sub-bodies 24, and the radial magnetic steel slot 4 has a radial opening 41 facing the radial outside of the inner core 1, and the radial opening 41 is filled with a third shock absorber 33, and the axial first end of the third shock absorber 33 is connected as a whole with the axial first end of the first shock absorber 31, and / or the axial second end of the third shock absorber 33 is connected as a whole with the axial second end of the first shock absorber 31. In this technical solution, the third shock absorber 33 can form an effective shock-absorbing support for the radial outer end surface of the magnetic steel 5 in the radial magnetic steel slot 4, which can further improve the connection strength and shock-absorbing effect of the overall structure of the motor rotor. It should be particularly noted that at this time, the first shock absorber 31, the second shock absorber 32 and the third shock absorber 33 together form an integrated cage-shaped shock absorber, which reliably shock-absorbing the motor rotor from the radial inside to the outside and from one axial end to the other, effectively preventing 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. The first shock absorber 31, the second shock absorber 32 and the third shock absorber 33 are formed into an organic whole by injection molding.

[0033] The motor rotor in the present invention can be assembled and processed in the following manner:

[0034] The first step: using a stamping die to stack the silicon steel sheets into an outer core and an inner core;

[0035] Step 2: Use a die-casting mold to die-cast the magnetic powder into corresponding magnetic steel;

[0036] Step 3: magnetizing the magnetic steel;

[0037] Step 4: Install the inner iron core, outer iron core and magnetic steel into the injection mold in sequence;

[0038] Step 5: high-temperature injection molding, the shock absorbing body (that is, the aforementioned first shock absorbing body 31, the second shock absorbing body 32 and the third shock absorbing body 33 and the corresponding axial end portions) is injection molded into one piece according to the designed structure;

[0039] The third, fourth and fifth steps can also be adjusted according to actual production, such as:

[0040] Step 3: Install the inner iron core, outer iron core and magnetic steel into the injection mold in sequence;

[0041] Step 4: High temperature injection molding, the shock absorber is molded into one piece according to the designed structure;

[0042] Step 5: Post-magnetize the injection molded integrated rotor.

[0043] According to an embodiment of the present invention, there is further provided a motor, comprising the motor rotor described above.

[0044] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the above-mentioned motor.

[0045] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0046] 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 core (1) and an outer core (2), wherein the outer core (2) is arranged around the circumference of the inner core (1) and a first gap is provided between the outer core (2) and the inner core (1), the first gap being filled with a second damping body (32), and along the axial direction of the inner core (1), the outer core (2) at least comprises a first core segment and a second core segment located at at least one end of the first core segment, the first core segment having a first axial flow portion, the second core segment having a second axial flow portion, the first axial flow portion being connected to the second axial flow portion in the axial direction, and the flow cross-sectional area of ​​the first axial flow portion is not equal to the flow cross-sectional area of ​​the second axial flow portion, and the first axial flow portion and the second axial flow portion are filled with a first damping body (31); the first core segment comprises a plurality of first core sub-bodies (23) arranged at intervals along the circumference of the inner core (1), the plurality of first axial flow portions are respectively located on the plurality of first core sub-bodies (23) in a one-to-one correspondence, and the second core segment comprises a plurality of first core sub-bodies (23) arranged at intervals along the circumference of the inner core (1), the plurality of first axial flow portions are respectively located on the plurality of first core sub-bodies (23) in a one-to-one correspondence, The core segment comprises a plurality of second core sub-bodies (24), and the plurality of second core sub-bodies (24) correspond to the plurality of first core sub-bodies (23) in the axial direction of the inner core (1); the first axial circulation portion comprises at least one first through hole (211), and the second axial circulation portion comprises at least one second through hole (221), and when projected on any radial surface of the inner core (1), the first through hole (211) and the second through hole (221) have overlapping parts; the first axial circulation portion comprises two first through holes (211), and the second axial circulation portion comprises two second through holes (221), the two first through holes (211) are arranged at intervals along the circumference of the inner core (1), and the two second through holes (221) are arranged at intervals along the axial direction of the inner core (1), a first rib is formed between the two first through holes (211), and a second rib is formed between the two second through holes (221), and when projected on any radial surface of the inner core (1), the first rib and the second rib form an intersection.

2. The motor rotor according to claim 1, characterized in that: The first axial end of the second shock-absorbing body (32) is connected to the first axial end of the first shock-absorbing body (31) as a whole, and / or the second axial end of the second shock-absorbing body (32) is connected to the second axial end of the first shock-absorbing body (31) as a whole.

3. The motor rotor according to claim 1, characterized in that: A radial magnetic steel slot (4) is formed between two adjacent first iron core sub-bodies (23) and two adjacent second iron core sub-bodies (24), the radial magnetic steel slot (4) having a radial opening (41) facing the radial outside of the inner iron core (1), the radial opening (41) being filled with a third shock absorber (33), the axial first end of the third shock absorber (33) being integrally connected to the axial first end of the first shock absorber (31), and / or the axial second end of the third shock absorber (33) being integrally connected to the axial second end of the first shock absorber (31).

4. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 3.

5. An air conditioner, characterized in that: Includes the motor as described in claim 4.

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