CN215009796U

CN215009796U - Rotor subassembly, motor and compressor

Info

Publication number: CN215009796U
Application number: CN202121606676.7U
Authority: CN
Inventors: 左亚军; 郑礼成; 吴延平; 周杏标
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2021-12-03
Anticipated expiration: 2031-07-14

Abstract

The utility model belongs to the technical field of the compressor, more specifically say, relate to a rotor subassembly, motor and compressor. The rotor assembly comprises a rotor core, a plurality of permanent magnets, a first balance block and a plastic wrapping piece, wherein the rotor core is provided with a shaft hole penetrating through the first end face and the second end face and a plurality of magnet grooves arranged around the shaft hole at intervals, the permanent magnets are embedded in the magnet grooves, the first balance block is installed on the first end face, the plastic wrapping piece is connected with the rotor core, and the first balance block, the permanent magnets and the rotor core are wrapped and molded into a whole. The utility model provides a rotor subassembly need not to set up end baffle backstop permanent magnet at rotor core's both ends to can effectively reduce rotor subassembly's vibration and noise, simultaneously, first balancing piece moulds a zonulae occludens in rotor core through the package, can avoid leading to rotor core to warp or damage because of connecting first balancing piece, rotor subassembly's production quality is more secure, and production efficiency can promote.

Description

Rotor subassembly, motor and compressor

Technical Field

The utility model belongs to the technical field of the compressor, more specifically say, relate to a rotor subassembly, motor and compressor.

Background

In the production technology of the compressor, in order to improve the performance of a compressor motor, a built-in rotor structure in which permanent magnets are embedded in a rotor core is generally adopted, end baffles are respectively arranged at two ends of the rotor core along the axial direction to limit the axial sliding of the permanent magnets, the permanent magnets are prevented from sliding out of the rotor core, meanwhile, a balance block is additionally arranged outside the end baffles, the balance block can correct the dynamic unbalance amount of a rotor assembly caused by the eccentricity of a rotating shaft by calculating the weight of the balance block, and the rotor assembly is ensured to rotate stably.

The rotor subassembly of above-mentioned structure, there is the fit-up gap between its permanent magnet and the end baffle, and the existence in clearance can lead to the compressor vibration and the noise increase when high-speed operation, and in addition, the balancing piece is being connected to rotor core's in-process, for example riveting connection etc. leads to rotor core to warp or damage because of the extrusion easily to increase product defective rate and manufacturing cost, production efficiency is difficult to promote.

SUMMERY OF THE UTILITY MODEL

The utility model discloses main aim at provides a rotor subassembly, motor and compressor to solve the rotor core among the prior art fragile rotor core when the assembly balancing piece, thereby lead to the technical problem that the product assembly defective rate risees.

The utility model adopts the technical proposal that: providing a rotor assembly comprising:

the rotor core is provided with a first end face and a second end face which are oppositely arranged, the rotor core is provided with a shaft hole penetrating through the first end face and the second end face, and a plurality of magnet grooves penetrating through the first end face and the second end face are arranged at intervals around the shaft hole;

a plurality of permanent magnets embedded in the magnet grooves;

the first balancing block is arranged on the first end surface;

and the plastic coating part is used for coating and molding the first balance block, the permanent magnet and the rotor iron core into a whole.

In some embodiments, the plastic covered piece comprises a first end plastic covered part and a second end plastic covered part, the first end plastic covered part covers the first end face and the first balancing block, and the second end plastic covered part covers the second end face.

In some embodiments, the plastic-coated part further comprises a plastic-coated connecting part connected with the first end plastic-coated part and the second end plastic-coated part, the rotor core further comprises an axial through hole arranged between two adjacent magnet grooves, the axial through hole penetrates through the first end face and the second end face, and the plastic-coated connecting part is arranged in the axial through hole.

In some embodiments, the plastic-coated part further comprises a first vibration reduction part connected with the first end plastic-coated part and the second end plastic-coated part, an embedded gap is formed between the permanent magnet and the magnet groove, and the first vibration reduction part is arranged in the embedded gap.

In some embodiments, the rotor core comprises a rotor outer core and a transmission inner core, the rotor outer core is provided with a mounting hole penetrating through the first end face and the second end face, the magnet groove and the axial through hole are both arranged in the rotor outer core, the transmission inner core is embedded in the mounting hole, and the shaft hole is arranged in the transmission inner core;

the plastic packaging part further comprises a second vibration reduction part connected with the first end plastic packaging part and the second end plastic packaging part, a mounting gap is formed between the transmission inner iron core and the mounting hole, and the second vibration reduction part is arranged in the mounting gap.

In some embodiments, the first end plastic-coated part, the second end plastic-coated part, the plastic-coated connecting part, the first vibration damping part and the second vibration damping part are integrally injection-molded.

In some embodiments, the overmold is a high molecular material overmold.

In some embodiments, the rotor assembly further comprises a second weight, the second weight is mounted on the second end face, and the second end plastic-coated part coats the second end face and the second weight.

In some embodiments, the first end overmolding comprises a first overmolding surface and a first protrusion protruding from the first overmolding surface, the first protrusion encapsulating the first weight, the first overmolding surface covering a portion of the first end surface not encapsulated by the first protrusion;

the second end plastic-coated part comprises a second plastic-coated surface and a second protrusion protruding from the second plastic-coated surface, the second protrusion coats the second balance block, and the second plastic-coated surface covers the part, which is not coated by the second protrusion, of the second end surface.

In some embodiments, the first weight has at least one first positioning column which is fittingly inserted into each axial through hole, and a first through hole penetrating through the first weight is arranged in the first positioning column;

the second balancing block is provided with at least one second positioning column which is in adaptive insertion connection with the axial through holes, and a second through hole which penetrates through the second balancing block is formed in the second positioning column.

In some embodiments, the first balance block is provided with two first positioning columns at intervals, the two first positioning columns are respectively in adaptive insertion connection with the adjacent two axial through holes, and the two first positioning columns are internally provided with first through holes;

and/or the second balancing block is provided with two second positioning columns at intervals, the two second positioning columns are respectively in adaptive insertion connection with the adjacent two axial through holes, and the two second positioning columns are internally provided with second through holes.

In some embodiments, one of the first positioning column and the second positioning column is in clearance fit or transition fit with the axial through hole, and the other of the first positioning column and the second positioning column is in clearance fit or interference fit or transition fit with the axial through hole.

In some embodiments, the first end plastic-coated part and/or the second end plastic-coated part has a permanent magnet positioning hole, a core positioning hole and a weight positioning hole, the permanent magnet positioning hole faces the permanent magnet, the core positioning hole faces the rotor core, and the weight positioning hole faces the first weight or the second weight.

The embodiment of the utility model provides an above-mentioned one or more technical scheme in the rotor subassembly have one of following technological effect at least: compared with the prior art, the utility model discloses a rotor subassembly moulds the piece through setting up the package, moulds an overall structure with rotor core, permanent magnet and first balancing piece package, and each structure of a parcel rotor subassembly is moulded to the package, makes permanent magnet and first balancing piece can be reliable install in rotor core. Like this, need not to set up end baffle backstop permanent magnet at rotor core's first terminal surface and second terminal surface to can avoid vibration and noise because of installation end baffle produces, effectively reduce the vibration and the noise of rotor subassembly. More importantly, the first balance block is connected in the rotor core through wrapping the plastic part, so that the deformation or damage of the rotor core caused by the fact that the first balance block and the rotor core are connected in a riveting mode and the like can be effectively avoided, the production quality of the rotor assembly is guaranteed, and the production efficiency is improved.

The utility model discloses another technical scheme is: an electric machine is provided comprising the rotor assembly described above.

The embodiment of the utility model provides a motor's beneficial effect lies in: compared with the prior art, the utility model discloses a motor, through using foretell rotor subassembly, vibration and noise reduction that produce in the motor working process, the damping noise reduction effect of motor is better, and because of the bad probability that leads to the motor to break down of production of rotor subassembly reduces, and the whole quality of motor can promote, and life can prolong.

The utility model discloses a further technical scheme is: a compressor is provided, which comprises the motor.

The embodiment of the utility model provides a compressor's beneficial effect lies in: compared with the prior art, the utility model discloses a compressor, through using foretell motor, the noise of compressor is little, the fault rate is low, and the user uses and experiences well.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the present invention;

FIG. 2 is an exploded schematic view of the rotor assembly shown in FIG. 1;

FIG. 3 is a cut-away view of the rotor assembly shown in FIG. 1;

FIG. 4 is another perspective view of the structure shown in FIG. 3;

fig. 5 is a schematic structural view of a first weight of the rotor assembly shown in fig. 1;

fig. 6 is a schematic structural view of a second weight of the rotor assembly shown in fig. 1;

fig. 7 is a schematic structural view of a rotor core of the rotor assembly shown in fig. 1;

FIG. 8 is an enlarged schematic view at A in FIG. 2;

fig. 9 is a front view of a first end face (or a second end face) of the rotor assembly shown in fig. 1.

In the figures, the various figures are mainly marked:

10. a rotor core; 101. a rotor outer core; 1011. mounting holes; 1012. a mounting gap; 1013. a first gap section; 1014. a second gap segment; 1015. internal teeth; 102. a transmission inner iron core; 1016. an outer tooth; 11. a first end face; 12. a second end face; 13. a shaft hole; 14. a magnet slot; 141. embedding a gap; 142. a first groove section; 143. a second groove section; 144. a first tail slot; 145. a second tail slot; 146. a gap; 15. an axial through hole; 20. a permanent magnet; 21. a first half magnet; 22. a second half magnet; 30. a first weight; 31. a first positioning post; 32. a first through hole; 40. a second weight; 41. a second positioning column; 42. a second through hole; 50. wrapping a plastic part; 51. the first end is covered with plastic; 511. a first plastic coating surface; 512. a first protrusion; 52. a second end plastic-coated part; 521. a second wrapping surface; 522. a second protrusion; 53. a plastic-coated connecting part; 54. a first vibration damping portion; 541. a first filling section; 542. a second filling section; 543. a third filling section; 544. a fourth filling section; 55. a second vibration damping portion; 56. a permanent magnet positioning hole; 57. an iron core positioning hole; 58. and a balance block positioning hole.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to fig. 1 to 9 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Reference throughout the specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. The appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like in various places in the specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the related art, a motor used in a compressor, such as a dc inverter compressor, generally employs a built-in rotor structure in which permanent magnets are embedded inside a rotor core. Generally, rotor core sets up a plurality of magnet grooves around its pivot even interval, and the magnet groove link up rotor core along axial both ends, and the permanent magnet inserts the magnet inslot from rotor core's one end, so, in order to guarantee in the motor use, the permanent magnet can not follow rotor core roll-off, still need set up the end baffle respectively at rotor core's both ends for the axial slip of restriction permanent magnet, in order to avoid the permanent magnet to follow the magnet groove roll-off, influence the normal work of motor. So, when the rotor subassembly of equipment motor, the tip baffle is connected with rotor core, and there is assembly clearance inevitable between tip baffle and the rotor core to make the vibration and the noise increase of rotor subassembly during operation, unable satisfying the operation requirement of compressor motor low noise or noiselessness work.

In addition, in order to correct the dynamic unbalance caused by the eccentricity of the rotating shaft, the rotor assembly of the compressor motor needs to be provided with balance blocks, the balance blocks are installed at one end or two ends of the rotor core, and the weight and the installation position of the balance blocks are determined through stress calculation, so that the rotor assembly keeps balance when rotating. Like this, for the fastness of guaranteeing the balancing piece when installing in rotor core, often rivet the balancing piece in rotor core, and balancing piece extrusion rotor core during the riveting probably leads to rotor core to appear warping or damaging for the production quality of rotor subassembly reduces, and product quality can't effectively be ensured.

Based on this, the embodiment of the utility model provides a rotor subassembly, it need not to set up end baffle backstop permanent magnet to can not produce the fit-up gap because of setting up end baffle, and, its balancing piece also need not to adopt riveted mode to be connected with rotor core, thereby can not lead to rotor core to take place to warp or damage because of the extrusion. The rotor assembly of the present invention will be described in detail with reference to specific embodiments.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the present invention, fig. 2 is an exploded schematic view of the rotor assembly according to the embodiment, fig. 3 is a schematic cross-sectional structure diagram of the rotor assembly according to the embodiment, and fig. 4 is another view of the cross-sectional structure shown in fig. 3.

Specifically, as shown in fig. 1 and 2, an embodiment of the present invention provides a rotor assembly including a rotor core 10, a plurality of permanent magnets 20, and at least one first weight 30. The rotor core 10 has a first end face 11 and a second end face 12 that are arranged opposite to each other along an axial direction, the rotor core 10 is provided with a shaft hole 13, the shaft hole 13 is arranged at a substantially central position of the rotor core 10 and penetrates through the first end face 11 and the second end face 12 of the rotor core 10 along the axial direction (the direction indicated by a dotted line in fig. 3) of the rotor core 10, and the shaft hole 13 is used for installing a rotating shaft for driving the rotor assembly to rotate. The rotor core 10 is further provided with a plurality of magnet grooves 14, and the magnet grooves 14 are uniformly spaced around the shaft hole 13 along the circumferential direction of the rotor core 10 and penetrate through both end surfaces of the rotor core 10, respectively, so that the permanent magnets 20 can be inserted and fitted into the corresponding magnet grooves 14 from the first end surface 11 or the second end surface 12.

As shown in fig. 2 and 4, the first weight 30 is mounted on the first end surface 11 of the rotor core 10 to balance the dynamic unbalance amount of the rotor assembly during the rotation process, it can be understood that the first weight 30 may also be mounted on the second end surface 12 of the rotor core 10, or the first weight 30 may also be mounted on both end surfaces, and the specific mounting position and number of the first weight 30 may be determined according to the force calculation of the rotor assembly to ensure the smooth operation of the rotor assembly, which is not limited in the present application.

In this embodiment, as shown in fig. 1, 2 and 4, the rotor assembly further includes a plastic-coated member 50 connected to the rotor core 10 and used for plastic-coating the first weight 30, the permanent magnet 20 and the rotor core 10 into an integral structure. Like this, permanent magnet 20 and first balancing piece 30 are through the parcel effect of plastic-coated piece 50 and stable firm the installing in rotor core 10, permanent magnet 20 receives plastic-coated piece 50's restriction and can't follow magnet groove 14 roll-off along the axial, and first balancing piece 30 is connected with rotor core 10 through plastic-coated piece 50, need not the rethread riveting etc. and in succession the mode and additionally improve the joint strength of first balancing piece 30 and rotor core 10, and the structure of rotor core 10 can not destroyed in the installation of first balancing piece 30.

The embodiment of the utility model provides a rotor subassembly, it moulds a 50 through setting up the package, moulds an overall structure with rotor core 10, permanent magnet 20 and first balancing piece 30 package, and each structure of 50 parcel rotor subassemblies are moulded to the package, make permanent magnet 20 and first balancing piece 30 can be reliable install in rotor core 10. Thus, the end baffles are not required to be arranged on the two end faces of the rotor core 10 to stop the permanent magnets 20, so that vibration and noise caused by the installation of the end baffles due to assembly clearance can be avoided, and the vibration and noise of the rotor assembly are effectively reduced. More importantly, the first weight 30 is tightly connected to the rotor core 10 through the plastic-covered member 50, so that deformation or damage of the rotor core 10 caused by connection of the first weight 30 and the rotor core 10 in a riveting manner and the like can be effectively avoided, and the production quality of the rotor assembly is further guaranteed.

In addition, compared with the rotor assembly with the conventional structure in the related art, the rotor assembly of the embodiment reduces two end baffles and a plurality of rivets for riveting the balance weight, only one plastic-coated piece 50 is added, the whole structure and the assembly process of the rotor assembly are simplified, and the production efficiency is improved.

In some embodiments, as shown in fig. 1, 2 and 4, the plastic-coated member 50 includes a first end plastic-coated portion 51 and a second end plastic-coated portion 52, the first end plastic-coated portion 51 and the second end plastic-coated portion 52 are substantially circular and have outer diameters substantially identical to the outer diameter of the rotor core 10, the first end plastic-coated portion 51 covers the first end surface 11 and the first weight 30, the second end plastic-coated portion 52 covers the second end surface 12, and the shaft hole 13 axially penetrates through the first end plastic-coated portion 51 and the second end plastic-coated portion 52. That is, the first end plastic-coated portion 51 covers the first end surface 11, and the second end plastic-coated portion 52 covers the second end surface 12, so that after the permanent magnet 20 is inserted into the magnet slot 14, the axial sliding of the permanent magnet is limited by the first end plastic-coated portion 51 and the second end plastic-coated portion 52, and the permanent magnet cannot slide out of the magnet slot 14, the first end plastic-coated portion 51 and the second end plastic-coated portion 52 are respectively tightly attached to the two end surfaces of the rotor core 10, and no assembly gap exists between the two end surfaces. Moreover, the first weight 30 is also covered by the first end plastic-covered part 51, the first end plastic-covered part 51 tightly presses the first weight 30 on the first end surface 11, the first weight 30 and the rotor core 10 are convenient to assemble, and the assembly process does not have adverse effects on the structure.

It will be appreciated that in other embodiments, as shown in fig. 2 and 3, the rotor assembly may further include a second weight 40, which is different from the above embodiments, wherein the second weight 40 may have the same structure as the first weight 30 except for different mass and size, and both weights are used for balancing the dynamic unbalance amount existing in the rotor assembly during the rotation, and are defined as the first weight 30 and the second weight 40, respectively, for the convenience of detailed description in the following embodiments.

For example, the first weight 30 is mounted on the first end surface 11 of the rotor core 10, the second weight 40 is mounted on the second end surface 12, the first end plastic-coated portion 51 covers the first end surface 11 and the first weight 30, and the second end plastic-coated portion 52 covers the second end surface 12 and the second weight 40. Thereby realizing the sliding limit of the permanent magnet 20 and simultaneously realizing the assembly connection of the first weight 30 and the second weight 40 with the rotor core 10.

Please refer to fig. 2 to 4 and fig. 7, wherein fig. 7 is a schematic structural diagram of a rotor core 10 of a rotor assembly according to an embodiment of the present invention. The rotor assembly of the present application will be described in more detail below, taking as an example that the first weight 30 is provided on the first end face 11 of the rotor core 10, and the second weight 40 is provided on the second end face 12 of the rotor core 10.

In another embodiment of the present invention, as shown in fig. 2 and 4, the first weight 30 is protruded on the first end surface 11 of the rotor core 10, the second weight 40 is protruded on the second end surface 12, the first end plastic-coated portion 51 includes a first plastic-coated surface 511 and a first protrusion 512, the second end plastic-coated portion 52 includes a second plastic-coated surface 521 and a second protrusion 522, the first protrusion 512 is formed by axially protruding from the position where the first plastic-coated surface 511 faces the first weight 30, and the second protrusion 522 is formed by axially protruding from the position where the second plastic-coated surface 521 faces the second weight 40.

The accommodating space defined by the first protrusion 512 is substantially the same as the volume of the first weight 30, so that the first protrusion 512 covers the first weight 30, the projected area of the first molding surface 511 on the first end surface 11 is substantially the same as the partial area of the first end surface 11 not covered by the first weight 30, and the first molding surface 511 covers the part of the first end surface 11 not covered by the first protrusion 512. The accommodating space defined by the second protrusion 522 is substantially the same as the volume of the second weight 40, so that the second protrusion 522 covers the second weight 40, the projected area of the second encapsulating surface 521 on the second end surface 12 is substantially the same as the partial area of the second end surface 12 not covered by the second weight 40, and the second encapsulating surface 521 covers the part of the second end surface 12 not covered by the second protrusion 522.

In this way, the specific configuration of the first end-plastic-covered portion 51 and the second end-plastic-covered portion 52 is set according to the shape and size of the first end face 11 and the second end face 12 of the rotor core 10 and the configuration thereof when the first weight 30 and the second weight 40 are mounted, so that the first end-plastic-covered portion 51 can be attached to cover the first end face 11, the first weight 30 can be accommodated in the first protrusion 512, the second end-plastic-covered portion 52 can be attached to cover the second end face 12, and the second weight 40 can be accommodated in the second protrusion 522.

In another embodiment of the present invention, as shown in fig. 2, 4 and 7, the plastic-coated member 50 further includes a plastic-coated connecting portion 53, the axial through hole 15 is further provided at a position where the rotor core 10 is located between two adjacent magnet slots 14, each axial through hole 15 axially penetrates through the first end surface 11 and the second end surface 12, the plastic-coated connecting portion 53 is filled in each axial through hole 15, and two end portions of the plastic-coated connecting portion 53 are respectively connected to the first end plastic-coated portion 51 and the second end plastic-coated portion 52. In this way, the plastic-coated connecting portion 53 applies an inward pulling force to the plastic-coated portions at the two ends, so that the first plastic-coated portion 51 and the second plastic-coated portion 52 are respectively and tightly attached to the corresponding first end surface 11 and the second end surface 12, no gap exists between the plastic-coated portions and the end surfaces, and the first weight 30 and the first end surface 11, and the second weight 40 and the second end surface 12 are tightly connected in a pressing manner.

In some embodiments, as shown in fig. 7, axial through holes 15 are provided at positions between two adjacent magnet slots 14 of the rotor core 10, that is, a plurality of axial through holes 15 are uniformly arranged around the shaft hole 13 at intervals, which can increase the number of plastic-coated connecting portions 53, which is equivalent to increase the amount of damping material inside the rotor core 10, thereby improving the damping effect of the rotor assembly of this embodiment.

It is understood that in other embodiments, the axial through hole 15 may be selectively disposed between any two adjacent magnet slots 14, so as to meet the requirement of the plastic-covered connecting portion 53 for connecting the first end plastic-covered portion 51 and the second end plastic-covered portion 52.

In another embodiment of the present invention, the first end covering plastic part 51, the second end covering plastic part 52 and the covering plastic connecting part 53 are integrally formed by injection molding. Therefore, the plastic-coated piece 50 is tightly and reliably connected with the rotor core 10, is not easy to separate, and has higher connection stability and reliability.

In another embodiment of the present invention, referring to fig. 4 to 6, the structure of the first weight 30 and the second weight 40 and the connection between the first weight and the rotor core 10 will be described. Fig. 5 is a schematic structural diagram of the first weight 30 according to the embodiment, and fig. 6 is a schematic structural diagram of the second weight 40 according to the embodiment.

In this embodiment, the first weight 30 has at least one first positioning post 31 adapted to be inserted into each axial through hole 15, the first positioning post 31 is protruded from a side portion of the first weight 30 facing the first end surface 11, the size of the first positioning post 31 is adapted to the axial through hole 15, and a first through hole 32 penetrating through the first weight 30 is formed in the first positioning post 31. The second balance weight 40 at least has a second positioning column 41 which is in adaptive insertion connection with each axial through hole 15, the second positioning column 41 is convexly arranged on the side portion of the second balance weight 40 opposite to the second end face 12, the size of the second positioning column 41 is matched with the axial through hole 15, and a second through hole 42 which penetrates through the second balance weight 40 is arranged in the second positioning column 41.

When the rotor assembly of the present embodiment is assembled, the mass and the mounting position of the first weight 30 and the second weight 40 are determined according to the stress calculation, the first positioning column 31 and the second positioning column 41 are respectively inserted into the axial through hole 15 at the corresponding positions, that is, the two weights are pre-assembled on the two end surfaces, and then the pre-assembled structure is placed into a mold, and the plastic package 50 is formed by injection molding. In the injection molding process, the material of the molded plastic-coated part 50 can flow in the axial through hole 15, the first through hole 32 and the second through hole 42, so that the plastic-coated connecting part 53, the first end plastic-coated part 51 and the second end plastic-coated part 52 are integrally molded.

In other embodiments, as shown in fig. 5 and fig. 6, the first weight 30 may also have two first positioning pillars 31 at intervals, the two first positioning pillars 31 are respectively adapted to be inserted into the two adjacent axial through holes 15, the second weight 40 may also have two second positioning pillars 41 at intervals, the two second positioning pillars 41 are respectively adapted to be inserted into the two adjacent axial through holes 15, the two first positioning pillars 31 are both provided with first through holes 32, and the two second positioning pillars 41 are both provided with second through holes 42.

So, set up two first reference columns 31 and two second reference columns 41 and peg graft with rotor core 10 respectively, can improve the pre-installation stability between first balancing piece 30 and second balancing piece 40 and the rotor core 10, avoid the balancing piece to drop at the in-process of putting into to the mould, in addition, the package is moulded connecting portion 53 and is connected first end package and mould portion 51 and second end package and mould portion 52 in two first reference columns 31 departments and two second reference columns 41 department, the overall structure intensity of piece 50 is moulded in the package increases, the package is moulded 50 and is improved to rotor core 10, permanent magnet 20, the cladding reliability of first balancing piece 30 and second balancing piece 40.

It is understood that in some other embodiments, the two first positioning posts 31 may be disposed on only the first weight 30 or the two second positioning posts 41 may be disposed on only the second weight 40, so as to satisfy the molding requirement of the plastic-covered member 50 and the structural strength requirement of the plastic-covered member 50.

In the related art, since the magnet slot 14 is a through slot structure penetrating through the first end surface 11 and the second end surface 12, after the permanent magnet 20 is inserted into the magnet slot 14, before the plastic-coated part 50 is molded, the permanent magnet 20 lacks a structure capable of limiting the axial sliding thereof, and when the rotor core 10 is vertically placed (i.e., the shaft hole 13 is vertical to the horizontal plane), the permanent magnet 20 slides out of the magnet slot 14 under the action of gravity. Moreover, in order to meet the requirement of force balance of the rotor assembly, the size of the first weight 30 is smaller than that of the first end surface 11, and the size of the second weight 40 is smaller than that of the second end surface 12, so that the first weight 30 and the second weight 40 are not enough to limit the axial movement of the permanent magnet 20.

Based on this, in another embodiment of the present invention, one of the first positioning column 31 and the second positioning column 41 is in clearance fit or transition fit with the axial through hole 15, and the other is in clearance fit or interference fit or transition fit with the axial through hole 15.

When assembling the rotor assembly of the present embodiment, since the first weight 30 blocks a portion of the magnet slot 14 from the first end surface 11 and the second weight 40 blocks a portion of the magnet slot 14 from the second end surface 12, before the plastic-coated member 50 is injection-molded, the permanent magnets 20 are correspondingly embedded into the magnet slot 14, and then the two weights 40 are connected to the rotor core 10. In this way, in order to ensure that the permanent magnet 20 can be smoothly inserted into the magnet slot 14 blocked by the balance blocks, and at the same time, ensure that the permanent magnet 20 loaded into the rotor core 10 does not slip off when being transferred into the mold, at least one of the two balance blocks needs to be pre-installed with the rotor core 10 in the mold. Like this, ensure that arbitrary one in first reference column 31 and the second reference column 41 is pegged graft with axial through hole 15 clearance fit or transition fit pegs graft, with clearance fit or transition fit connection's balancing piece inside the mould with rotor core installation, compare interference fit peg graft and can reduce the intensity requirement of balancing piece pre-installation technology to the relevant structure of mould to reduce the technology degree of difficulty of moulding plastics, improve the production efficiency of the rotor subassembly of this embodiment.

It is understood that, in the specific embodiment, the first positioning column 31 and the second positioning column 41 are inserted into the axial through hole 15 in an interference fit manner. Then, if before the injection molding process, that is, two balance blocks are preassembled outside the mold, because the rotor assembly is vertically placed in the mold for injection molding, at this time, at least one of the first end surface 11 or the second end surface 12 of the rotor core 10 directly offsets with the mold structure, so that the permanent magnet 20 cannot be inserted from the end surface, so that the permanent magnet 20 installed on the other end surface in the magnet groove 14 at the shielding position of the balance block of the end surface is difficult to insert (in order to ensure that the permanent magnet 20 does not slide down to the mold after being inserted, the permanent magnet 20 needs to be inserted in the mold), at this time, it may be necessary to provide a hole or a cavity for inserting the permanent magnet 20 in the mold structure, and the insertion of all the permanent magnets 20 can be completed. Not only can increase the structure complexity of mould like this, still can increase injection moulding process's complexity to the production degree of difficulty of increase this application rotor subassembly leads to production efficiency to reduce. Based on this, if only a balancing piece is preassembled outside the mould, and another balancing piece is preassembled in the mould, then, can simplify permanent magnet 20's cartridge process, the aforesaid problem of effectual solution, however, this moment, if the balancing piece of installing in the mould sets to interference fit grafting, then, interference fit's connected mode then can greatly increased balancing piece preassemble the intensity requirement of process to the relevant structure of mould to increase the preparation degree of difficulty of mould.

In this embodiment, when the first balance weight 30 and the second balance weight 40 have different masses, the positioning column of the large-mass balance weight may be connected to the axial through hole 15 in an interference fit manner, so as to improve the connection reliability between the large-mass balance weight and the rotor core 10, and the positioning column of the small-mass balance weight may be connected to the axial through hole 15 in a clearance fit or transition fit manner, so as to ensure that the small-mass balance weight is quickly positioned and preloaded during the injection molding process.

In another embodiment of the present invention, please continue to refer to fig. 2 to fig. 4, and fig. 7 and fig. 8, wherein fig. 8 is an enlarged schematic view of a portion a in fig. 2.

In this embodiment, as shown in fig. 2, 7 and 8, the plastic-coated member 50 further includes a first vibration damping portion 54, an embedded gap 141 is formed between the permanent magnet 20 and the magnet slot 14, the first vibration damping portion 54 is disposed in the embedded gap 141, two ends of the first vibration damping portion 54 are respectively connected to the first end plastic-coated portion 51 and the second end plastic-coated portion 52, and the first vibration damping portion 54 fills the gap between the permanent magnet 20 and the magnet slot 14, so that the permanent magnet 20 is prevented from shaking, the mounting stability of the permanent magnet 20 is improved, and meanwhile, the first vibration damping portion 54 can also buffer vibration, and the vibration damping effect of the rotor assembly of this embodiment is improved.

Specifically, as shown in fig. 2 and 7, the magnet slot 14 includes a first slot segment 142 and a second slot segment 143 connected to one end of the first slot segment 142, the first slot segment 142 and the second slot segment 143 constitute the magnet slot 14 having a substantially "V" shape, the permanent magnet 20 includes a first half magnet 21 adapted to be inserted into the first slot segment 142 and a second half magnet 22 adapted to be inserted into the second slot segment 143, the magnet slot 14 further includes a first end slot 144 connected to a free end (an end facing away from the second slot segment 143) of the first slot segment 142, and a second end slot 145 connected to a free end (an end facing away from the first slot segment 142) of the second slot segment 143. The fit-in gap 141 includes a first end groove 144, a second end groove 145, and a gap 146 between the first groove section 142 and the second groove section 143, and correspondingly, the first vibration damping portion 54 includes a first filling section 541 filled in the gap 146 between the first groove section 142 and the second groove section 143, and a second filling section 542 and a third filling section 543 filled in the first end groove 144 and the second end groove 145, so that the three filling sections are engaged with the first end plastic-coated portion 51 and the second end plastic-coated portion 52 to limit the permanent magnet 20 in the magnet groove 14.

In this embodiment, when the length of the permanent magnet 20 is the same as the length of the magnet slot 14, the two ends of the permanent magnet 20 in the axial direction directly abut against the first end plastic-coated part 51 and the second end plastic-coated part 52, so that the permanent magnet cannot slide in the axial direction (not shown); when the length of the permanent magnet 20 is smaller than that of the magnet slot 14, at least one end of the permanent magnet 20 cannot abut against the corresponding first end plastic-coated portion 51 (or the second end plastic-coated portion 52), at this time, the first vibration damping portion 54 may further include a fourth filling section 544 filled in a gap between the first slot section 142 and the second slot section 143 and the first end surface 11 (or the second end surface 12), as shown in fig. 8, at this time, the fourth filling section 544 is connected to the corresponding first end plastic-coated portion 51 (or the second end plastic-coated portion 52), so as to limit the axial sliding of the permanent magnet 20.

In another embodiment of the present invention, please continue to refer to fig. 2, fig. 4 and fig. 7. In this embodiment, the rotor core 10 includes a rotor outer core 101 and a transmission inner core 102, the rotor outer core 101 has a mounting hole 1011 penetrating both end faces, both the magnet groove 14 and the axial through hole 15 are provided in the rotor outer core 101, the transmission inner core 102 is fitted in the mounting hole 1011, and the shaft hole 13 is provided in the transmission inner core 102.

The plastic-coated part 50 further comprises a second vibration damping part 55, a mounting gap 1012 is formed between the transmission inner iron core 102 and the mounting hole 1011, the second vibration damping part 55 is arranged in the mounting gap 1012, and two ends of the second vibration damping part 55 are respectively connected with the first end plastic-coated part 51 and the second end plastic-coated part 52. In this way, the second vibration reduction portion 55 is filled in the gap between the transmission inner core 102 and the rotor outer core 101, so that the connection reliability of the rotor core 10 is improved, and the mounting gap 1012 is filled with the second vibration reduction portion 55, whereby the vibration reduction effect of the rotor assembly of the present embodiment can be further improved.

Specifically, in the present embodiment, as shown in fig. 4 and 7, a plurality of internal teeth 1015 are uniformly and convexly provided on the hole wall of the mounting hole 1011 along the circumferential direction at intervals, a plurality of external teeth 1016 are uniformly and convexly provided on the circumferential wall of the transmission inner core 102 along the circumferential direction at intervals, the plurality of internal teeth 1015 and the plurality of external teeth 1016 are alternately arranged at intervals to form a plug-in structure, the mounting gap 1012 includes a first gap section 1013 formed between the internal teeth 1015 and the circumferential wall of the transmission inner core 102, and a second gap section 1014 formed between the external teeth 1016 and the hole wall of the mounting hole 1011, and the second vibration damping portion 55 is filled in the first gap section 1013 and the second gap section 1014.

In another embodiment of the present invention, the first end plastic-coated portion 51, the second end plastic-coated portion 52, the plastic-coated connecting portion 53, the first vibration damping portion 54 and the second vibration damping portion 55 are integrally injection-molded. Therefore, the plastic-coated piece 50 is tightly and reliably connected with the rotor core 10, is not easy to separate, and the connection stability and reliability are further improved.

In another embodiment of the present invention, the plastic-covered member 50 is a high polymer material injection molded member, and specifically can be a plastic member or a rubber member, and other thermoplastic material members. Use macromolecular material to make into plastic parts 50, plastic parts 50 can absorb the vibration energy that the rotor subassembly operation in-process produced by a wide margin to improve the effect of making an uproar and damping of falling of this embodiment rotor subassembly.

In another embodiment of the present invention, please refer to fig. 1 and fig. 9, wherein fig. 9 is a front view of the first end surface 11 (or the second end surface 12) of the rotor assembly provided in the embodiment.

In this embodiment, as shown in fig. 9, at least one of the first end plastic-coated part 51 and the second end plastic-coated part 52 of the plastic-coated part 50 is provided with a permanent magnet positioning hole 56, an iron core positioning hole 57 and a balance weight positioning hole 58 correspondingly penetrating through the plastic-coated part, the permanent magnet positioning hole 56 faces the permanent magnet 20, the iron core positioning hole 57 faces the rotor iron core 10, the balance weight positioning hole 58 faces the first balance weight 30 or the second balance weight 40, specifically, the balance weight positioning hole 58 provided in the first end plastic-coated part 51 faces the first balance weight 30, and the balance weight positioning hole 58 provided in the second end plastic-coated part 52 faces the second balance weight 40. Thus, the rotor core 10, the first weight 30, the second weight 40 and the permanent magnet 20 are partially exposed at the corresponding positioning holes, and the positioning holes help to ensure the relative position relationship among the parts of the rotor assembly of the embodiment, so that the injection molding precision of the plastic-coated part 50 is improved, and the defective rate of the injection molding process is reduced.

The following briefly describes a manufacturing process of a rotor assembly (when a first weight and a second weight are provided) according to an embodiment of the present invention:

s10, manufacturing a rotor iron core, a permanent magnet, a first balance weight and a second balance weight respectively;

and S20, pre-installing one of the first balance weight and the second balance weight to the rotor core. In a specific embodiment, the balance blocks which are not preassembled are balance blocks which are in clearance fit or transition fit connection with the rotor core;

s30, placing the structure pre-assembled in the step S20 into a mould for positioning;

s40, inserting the permanent magnets into the magnet grooves in a one-to-one correspondence mode, and installing the other second balance block or the first balance block which is not preassembled to the rotor core;

s50, integrally injection-molding the rotor core, the permanent magnet, the first balance weight and the second balance weight into a plastic-coated structure by using a high polymer material through an injection molding process.

The utility model discloses the rotor subassembly of above-mentioned each embodiment, it moulds the piece with rotor core through setting up the package, an overall structure is moulded to permanent magnet and balancing piece package, each structure of a parcel rotor subassembly is moulded to the package, make permanent magnet and balancing piece can be reliable install in rotor core, can avoid vibration and noise because of installing end baffle and producing, effectively reduce the vibration and the noise of rotor subassembly, can also effectively avoid leading to rotor core to warp or damage because of installing the balancing piece, the production quality of rotor subassembly is more secure, and production efficiency is higher.

Another embodiment of the present invention further provides a motor, including the above-mentioned rotor assembly.

The embodiment of the utility model provides a motor, through using foretell rotor subassembly, vibration and noise reduction that produce in the motor working process, the damping noise reduction effect of motor is better, and because of the bad probability that leads to the motor to break down of production of rotor subassembly reduces, and the whole quality of motor can promote, and life can prolong. The motor also has other technical effects of the rotor assembly provided by the above embodiments, and details are not repeated herein.

Another embodiment of the present invention further provides a compressor, which includes the above-mentioned motor.

The embodiment of the utility model provides a compressor, through using foretell motor, the noise of compressor is little, the fault rate is low, and the user uses and experiences well.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A rotor assembly, comprising:

a plurality of permanent magnets embedded in the magnet grooves;

the first balancing block is arranged on the first end surface;

and the plastic coating part is used for coating and molding the first balance block, the permanent magnet and the rotor core into a whole.

2. The rotor assembly of claim 1 wherein the overmold includes a first end overmold portion that encases the first end face and the first weight and a second end overmold portion that encases the second end face.

3. The rotor assembly of claim 2, wherein the plastic-coated part further comprises a plastic-coated connecting part connected with the first end plastic-coated part and the second end plastic-coated part, the rotor core further comprises an axial through hole arranged between two adjacent magnet slots, the axial through hole penetrates through the first end face and the second end face, and the plastic-coated connecting part is arranged in the axial through hole.

4. The rotor assembly of claim 3, wherein the plastic-coated part further comprises a first vibration reduction part connected with the first end plastic-coated part and the second end plastic-coated part, an embedded gap is formed between the permanent magnet and the magnet groove, and the first vibration reduction part is arranged in the embedded gap.

5. The rotor assembly according to claim 4, wherein the rotor core comprises a rotor outer core and a transmission inner core, the rotor outer core is provided with a mounting hole penetrating through the first end surface and the second end surface, the magnet groove and the axial through hole are both arranged in the rotor outer core, the transmission inner core is embedded in the mounting hole, and the shaft hole is arranged in the transmission inner core;

the package is moulded a piece still include with first end package mould the portion with the second damping portion that the portion links to each other is moulded to the second end package, the transmission inner core with installation clearance has between the mounting hole, second damping portion is located in the installation clearance.

6. The rotor assembly of claim 5 wherein the first end plastic-coated portion, the second end plastic-coated portion, the plastic-coated connecting portion, the first vibration dampening portion and the second vibration dampening portion are integrally injection molded.

7. The rotor assembly of claim 6 wherein the overmold is a polymer material overmold.

8. The rotor assembly of any one of claims 3 to 7, further comprising a second weight, the second weight being mounted to the second end face, the second end over-molded portion covering the second end face and the second weight.

9. The rotor assembly of claim 8 wherein the first end overmold portion includes a first overmold surface and a first protrusion protruding from the first overmold surface, the first protrusion encapsulating the first weight, the first overmold surface covering a portion of the first end face not encapsulated by the first protrusion;

the second end plastic-coated part comprises a second plastic-coated surface and a second protrusion protruding from the second plastic-coated surface, the second protrusion coats the second balance block, and the second plastic-coated surface covers the part, not coated by the second protrusion, of the second end surface.

10. The rotor assembly of claim 8, wherein the first weight has at least one first positioning post adapted to engage with each of the axial through holes, the first positioning post having a first through hole formed therein and extending through the first weight;

11. The rotor assembly according to claim 10, wherein the first weight is provided with two first positioning posts at intervals, the two first positioning posts are respectively inserted into two adjacent axial through holes, and the first through holes are formed in the two first positioning posts;

and/or the second balancing block is provided with two second positioning columns at intervals, the two second positioning columns are respectively in adaptive insertion connection with the two adjacent axial through holes, and the second through holes are formed in the two second positioning columns.

12. The rotor assembly of claim 10 wherein one of the first and second locator posts is clearance fit or transition fit with the axial through bore and the other is clearance fit or interference fit or transition fit with the axial through bore.

13. The rotor assembly of claim 8, wherein the first end plastic-coated portion and/or the second end plastic-coated portion has a permanent magnet positioning hole, a core positioning hole, and a weight positioning hole, the permanent magnet positioning hole facing the permanent magnet, the core positioning hole facing the rotor core, and the weight positioning hole facing the first weight or the second weight.

14. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 13.

15. A compressor comprising the motor of claim 14.