CN113644767A - Motor and rotor assembly thereof - Google Patents

Abstract

The invention discloses a motor and a rotor assembly thereof, wherein the rotor assembly comprises an end cover, a rotating shaft and a rotor core, the end cover is also provided with a shaft sleeve for connecting the rotating shaft, the end cover is formed in an injection molding mode, and the shaft sleeve, the rotor core and the end cover are connected into a whole while the end cover is formed; the rotor core comprises a plurality of first laminations and second laminations which are mutually overlapped, wherein a first channel which penetrates through the first laminations and a second channel which penetrates through the second laminations are axially formed in the rotor core; and simultaneously the end cover is formed by injection molding, and the limiting parts are formed in the first channel and the second channel by injection molding. The end cover is formed through an injection molding process, the shaft sleeve is arranged on the end cover and matched with the rotating shaft, the shaft sleeve and the rotor core are molded into a whole while the end cover is formed, and the limiting piece is formed by injection molding in the rotor core, so that the process is simplified, and the weight of the motor is effectively reduced.

Description

Motor and rotor assembly thereof

Technical Field

The invention relates to the technical field of motors, in particular to a motor and a rotor assembly thereof.

Background

Conventional motors generally have the following problems:

1. the casing is usually formed by aluminum alloy die casting, so that the cost is high, the process is complex, the weight is heavy, and the loss and the cost performance of the motor are influenced;

2. the iron core and the shell are directly in interference fit or are fixed by glue after being in clearance fit, and the rotor of the whole motor is heavier, so that the starting current of the motor is increased, and the loss of the motor is increased;

3. the rotor core is generally stacked by a plurality of laminations, and in order to fix the plurality of laminations, a fixing pin penetrating the plurality of laminations is generally required, which is complicated in assembly and low in reliability.

Disclosure of Invention

The present invention provides a motor and a rotor assembly thereof, aiming at the defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a rotor assembly comprises an end cover, a rotating shaft and a rotor core, wherein the end cover is also provided with a shaft sleeve used for connecting the rotating shaft, the end cover is formed in an injection molding mode, and the shaft sleeve, the rotor core and the end cover are connected into a whole while the end cover is formed;

the rotor core comprises a plurality of first laminations and second laminations which are mutually overlapped, wherein a first channel penetrating through the first laminations and a second channel penetrating through the second laminations are axially formed in the rotor core, the first channel is communicated with at least one second channel, and the rotor core further comprises a limiting part for fixing the first laminations and the second laminations which are mutually overlapped;

and simultaneously forming the end cover by injection molding, and forming the limiting piece in the first channel and the second channel by injection molding.

Preferably, the first lamination is provided with a plurality of first through holes for constructing the first channels, the second lamination is provided with a plurality of second through holes for constructing the second channels, and the size of the first through holes is larger than that of the second through holes.

Preferably, the limiting member includes a sealing post filled in the first channel and a positioning post filled in the second channel, and the sealing post and the positioning post are integrally disposed.

Preferably, each second channel is communicated with at least two first channels at the same time, and at least two first channels communicated with the second channels are arranged at intervals.

Preferably, the first lamination is of a circular ring structure and comprises first bosses which are arranged on the inner ring of the first lamination in a protruding mode along the radial direction, and a plurality of first bosses are uniformly distributed in the inner ring of the first lamination;

at least two first through holes are formed in the same first boss.

Preferably, the second lamination is of a circular ring structure and comprises second bosses which are arranged on the inner ring of the second lamination in a protruding mode along the radial direction, and a plurality of second bosses are uniformly distributed in the inner ring of the second lamination;

the second through hole is formed in the second boss.

Preferably, the first lamination and the second lamination have the same shape, after the first lamination and the second lamination are overlapped, the first bosses and the second bosses are arranged in a one-to-one correspondence manner, and meanwhile, the first through holes are communicated with the second through holes.

Preferably, the rotor assembly further comprises a plurality of magnetic steels fixed in the rotor core;

the rotor core is further provided with a plurality of fixing grooves used for fixing the magnetic steel along the axial direction, and the fixing grooves penetrate through the rotor core along the axial direction.

Preferably, two sides of the first boss and the second boss are respectively provided with a first hook and a second hook which are arranged oppositely, and the first hook and the second hook are oppositely arranged on the two adjacent first bosses and/or the two adjacent second bosses to form a fixing cavity for accommodating the magnetic steel;

when the first laminations and the second laminations are overlapped to form the rotor core, the fixing cavities are in one-to-one correspondence and extend along the axial direction to form the fixing grooves.

Preferably, the end cover is hollow, and the rotor core is coaxially sleeved in the end cover;

a plurality of radiating blades are arranged on the periphery of the upper edge of the end cover, gaps are formed between every two adjacent radiating blades, and openings communicated with the inner cavity of the end cover are formed in the gaps.

The invention also provides a motor, which comprises the rotor assembly and a stator assembly coaxially matched with the rotor assembly, wherein the stator assembly comprises a stator seat, a stator core sleeved on the stator seat, a first bearing and a second bearing which are arranged in the stator core;

and a plurality of stator windings are arranged on the stator iron core.

Preferably, the rotating shaft penetrates through the stator seat, a first accommodating cavity and a second accommodating cavity for accommodating the first bearing and the second bearing are further arranged in the stator seat, and the first accommodating cavity and the second accommodating cavity are coaxially arranged.

The invention has the following beneficial effects: in the invention, the end cover of the rotor assembly is formed by an injection molding process, the shaft sleeve is arranged on the end cover and matched with the rotating shaft, the shaft sleeve and the rotor core are molded into a whole while the end cover is formed, and the limiting piece is formed in the rotor core by injection molding, so that the process is simplified, the overall weight of the motor is effectively reduced, the reliability of the rotor core and the end cover can be further enhanced, and the service life of the motor is prolonged.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a limiter separated from a rotor assembly according to an embodiment of the rotor assembly of the present invention;

FIG. 2 is an exploded schematic view of one embodiment of a rotor assembly of the present invention;

FIG. 3 is a schematic structural view of one embodiment of a first lamination in the rotor assembly of the present invention;

FIG. 4 is a schematic structural view of one embodiment of a second lamination in the rotor assembly of the present invention;

FIG. 5 is a schematic cross-sectional view of one embodiment of the motor of the present invention;

figure 6 is a schematic structural view of one embodiment of a stator assembly in the electric machine of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The invention provides a rotor assembly 10 and a motor, wherein, referring to fig. 1 and fig. 2, the rotor assembly comprises an end cover 11, a rotating shaft 12, a rotating shaft iron core 13 and a shaft sleeve 15. Specifically, the end cover 11 is formed by injection molding, and the shaft sleeve 15, the rotating shaft core 13 and the end cover 11 are connected into a whole while the end cover 11 is formed by injection molding.

Specifically, referring to fig. 2 and 5, the shaft sleeve 15 has a cylindrical structure, and in some embodiments, the outer wall of the shaft sleeve 15 is further provided with a protruding edge 151 along the circumference, preferably, the protruding edge 151 is provided at the middle of the length direction of the shaft sleeve 15, and when the shaft sleeve 15 and the end cover 11 are molded as a whole, the protruding edge 151 is embedded in the end cover 11, thereby increasing the connection strength between the shaft sleeve 15 and the end cover 11. One end of the rotating shaft 12 is in interference fit with the shaft sleeve 15, the rotating shaft 12 is fixed on the end cover 11 through the shaft sleeve 15, and meanwhile, the rotor assembly 10 provided by the invention can achieve the effects of water resistance, high temperature resistance and wear resistance through the arrangement of the shaft sleeve 15.

Further, the shaft core 13 includes a plurality of first lamination sheets 131 and a plurality of second lamination sheets 132 laminated to each other. First passages penetrating through the first laminations 131 and second passages penetrating through the second laminations 132 are axially formed in the rotating shaft iron core 13, wherein the rotating shaft iron core 13 can be uniformly distributed with a plurality of first passages and second passages, and each first passage is communicated with at least one second passage. Further, referring to fig. 1 and 2, the rotary shaft core 13 further includes a retaining member 16 for fixing the stacked first lamination 131 and second lamination 132, and the retaining member 16 is injection-molded in the first channel and the second channel while the end cover 11 is injection-molded, so as to fix the plurality of first lamination 131 and second lamination 132 as a whole.

Specifically, referring to fig. 3, the first lamination 131 is annular, and a plurality of first bosses 1312 are further protruded radially on the inner ring thereof, that is, in the present invention, the first bosses 1312 are formed by protruding radially inward on the inner diameter of the first lamination 131. A plurality of first bosses 1312 are circumferentially spaced about the inner ring of the first laminations 131. Further, in some embodiments, the first boss 1312 is further provided with a first through hole 1311 for forming a first channel, and as a specific embodiment of the present invention, the first through hole 1311 is preferably an elongated hole, and a length direction of the elongated hole is preferably arranged in a tangential direction of the circular ring. Of course, the above is only one embodiment of the present invention, and the first through holes 1311 with other shapes or other layouts may also be considered to fall within the scope of the present invention.

Further, referring to fig. 4, the second lamination 132 is also in a ring shape, and preferably, the first lamination 131 and the second lamination 132 have a completely same outer shape, and a plurality of second bosses 1322 are protruded radially on the inner ring thereof, that is, the second bosses 1322 are formed on the inner diameter of the second lamination 132 and protrude radially inward. The second projection 1322 is provided with a second through hole 1321 for constructing the second projection 1322. Specifically, the second through holes 1321 are preferably circular holes, and at least one second through hole 1321 is provided on each second boss 1322. As mentioned above, the above is only one embodiment of the present invention, and the second through hole 1321 with other shapes or layouts can be considered to fall within the scope of the present invention.

In some embodiments, the plurality of first laminations 131 are axially and coaxially overlapped, the plurality of second laminations 132 are axially and coaxially overlapped with each other, and then the plurality of first laminations 131 are axially stacked above the plurality of second laminations 132 to form the shaft core 13. Further, it is preferable that the first bosses 1312 and the second bosses 1322 are disposed at the same positions, and when the first lamination 131 and the second lamination 132 are coaxially stacked, the first through hole 1311 communicates with the at least one second through hole 1321. As a specific embodiment of the present invention, each first boss 1312 is provided with a first through hole 1311, and the first through hole 1311 is an oblong hole; each second boss 1322 is provided with two second through holes 1321 arranged at intervals, the second through holes 1321 are round holes, in this embodiment, the length of the oblong hole is greater than the diameter of the two round holes, and after the first lamination sheet 131 and the second lamination sheet 132 are overlapped, each first through hole 1311 is correspondingly communicated with the two second through holes 1321, that is, on the rotating shaft core 13, each first passage is simultaneously communicated with the two second passages. Further, as an embodiment of the present invention, the rotary shaft core 13 includes N second lamination sheets 132 overlapped with each other, where N is a natural number greater than 3, and two first lamination sheets 131 overlapped with each other, the two first lamination sheets 131 are overlapped with each other and then stacked above the second lamination sheets 132, the two first lamination sheets 131 are overlapped with each other so that the first through holes 1311 are communicated in a one-to-one correspondence to form first passages, and the N second lamination sheets 132 overlapped with each other so that the second through holes 1321 are communicated in a one-to-one correspondence to form second passages; when the first lamination 131 and the second lamination 132 are overlapped, the second passages formed by the second through holes 1321 are in one-to-one correspondence with the first passages formed by the first through holes 1311.

Further, referring to fig. 2, the rotor assembly 10 further includes a plurality of magnetic steels 17 fixed in the rotating shaft core 13, and a fixing groove 133 for fixing the magnetic steels 17 penetrates through the rotating shaft core 13. Specifically, a first hook 1331 and a second hook 1332 are disposed on two sides of the first boss 1312 and the second boss 1322, wherein the first hook 1331 and the second hook 1332 are disposed opposite to each other, and a fixing cavity 1333 is formed between the first hook 1331 and the second hook 1332 on two adjacent first bosses 1312 and/or two adjacent second bosses 1322. When the first lamination sheet 131 and the second lamination sheet 132 are overlapped to form the rotation shaft core 13, the plurality of fixing cavities 1333 are disposed in one-to-one correspondence and extend in the axial direction of the rotation shaft core 13, and are configured as fixing grooves 133 for inserting the magnetic steel 17. Since the first bosses 1312 and the second bosses 1322 are uniformly distributed on the first lamination sheet 131 and the second lamination sheet 132, respectively, in the present invention, the fixing grooves 133 are uniformly distributed on the inner ring of the shaft core 13.

Further, while the end cap 11 is injection molded, the limiting member 16 is injection molded simultaneously in the first channel and the second channel of the rotating shaft core 13, the limiting member 16 includes a sealing post 161 filled in the first channel and a positioning post 162 filled in the second channel, and since the limiting member 16 is injection molded, the sealing post 161 and the positioning post 162 are integrally molded.

In some embodiments, the end cap 11 is hollow inside, and the shaft core 13 is disposed inside the end cap 11 coaxially with the sleeve 15. Further, a plurality of radiating blades 111 are arranged on the end cover 11 along the periphery, gaps are formed between adjacent radiating blades 111, and an opening communicated with an inner cavity of the end cover is formed in the gap, so that when the rotor starts to work, generated heat can be dissipated to the outside through the gaps between the radiating blades 111. In some embodiments, a plurality of screw holes are further formed in the top surface of the end cover 11, so as to facilitate the matching and installation of the motor containing the rotor assembly 10 and a product, and in some embodiments, the screw holes are preferably uniformly distributed on the top surface of the end cover 11 along the circumference by taking a circle center as an axis.

When assembling the rotor assembly 10 provided by the present invention, first, the second lamination 132 and the first lamination 131 are sequentially stacked from bottom to top, and the shaft sleeve 15 and the stacked rotating shaft core 13 are placed in a corresponding mold, and plastic or epoxy resin glue is injected into the mold to form the end cover 11, and at the same time, the shaft sleeve 15 and the rotating shaft core 13 are fixed in the end cover 11; while the end cap 11 is injection molded, plastic or epoxy resin glue is injected into the first through hole 1311 of the first lamination 131 located at the uppermost position of the rotary shaft core 13, so that the injection molding material is completely filled in the first channel and the second channel, and a stopper 16 is formed to fix the first lamination 131 and the second lamination 132 stacked with each other, thereby further enhancing the reliability between the rotary shaft core 13 and the end cap 11 and preventing the motor from being deformed during high-speed rotation.

The present invention also provides an electric machine, comprising the above-mentioned rotor assembly 10, and a stator assembly 20 coaxially fitted with the rotor assembly 10, with reference to fig. 5. Referring to fig. 6, the stator assembly 20 includes a stator holder 21, a stator core 22, a first bearing 23, and a second bearing 24. One end of the rotating shaft 12 is tightly matched and connected with the shaft sleeve 15, and the other end penetrates through the stator assembly 20, so that the stator assembly 20 and the rotor assembly 10 are assembled into a whole.

Specifically, the rotating shaft 12 penetrates through and is inserted into the stator seat 21 along the axial direction, a first accommodating cavity 211 and a second accommodating cavity 212 which are used for accommodating the first bearing 23 and the second bearing 24 respectively are further arranged in the stator seat 21, wherein the first accommodating cavity 211 and the second accommodating cavity 212 are coaxially arranged, the first bearing 23 is accommodated in the first accommodating cavity 211, and the second bearing 24 is accommodated in the second accommodating cavity 212 and coaxially assembled with the rotating shaft 12.

In some embodiments, referring to fig. 6, the stator core 22 includes a ring-shaped core 221 and a plurality of divergent cores 222 divergently arranged from the ring-shaped core 221 in the circumferential direction, and further, a plurality of stator windings 25 are further arranged on the stator core 22, preferably, the stator windings 25 are wound on the divergent cores 222 in a one-to-one correspondence, and the stator core 22 equipped with the stator windings 25 is coaxially arranged in the shaft core 13.

After the processing of the rotor assembly 10 provided by the present invention is completed by injection molding, when the present stator assembly 20 and the rotor assembly 10 are assembled, the rotating shaft fixedly connected with the end cover 11 through the shaft sleeve 15 penetrates through the stator seat 21, so that one end of the stator seat 21 abuts against the shaft sleeve 15, and the stator core 22 assembled with the stator winding 25 and the shaft sleeve 15 are arranged in the rotor core 13, thereby completing the assembly of the motor of the present invention.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A rotor assembly (10) is characterized by comprising an end cover (11), a rotating shaft (12) and a rotor core (13), wherein a shaft sleeve (15) used for connecting the rotating shaft (12) is further arranged on the end cover (11), the end cover (11) is formed in an injection molding mode, and the shaft sleeve (15) and the rotor core (13) are connected with the end cover (11) into a whole while the end cover (11) is formed;

the rotor core (13) comprises a plurality of first laminated sheets (131) and second laminated sheets (132) which are mutually laminated, wherein a first channel penetrating through the plurality of first laminated sheets (131) and a second channel penetrating through the plurality of second laminated sheets (132) are formed in the rotor core (13) along the axial direction, the first channel is communicated with at least one second channel, and the rotor core (13) further comprises a limiting piece (16) used for fixing the first laminated sheets (131) and the second laminated sheets (132) which are mutually laminated;

the stop member (16) is injection molded in the first and second channels simultaneously with injection molding the end cap (11).

2. The rotor assembly (10) according to claim 1, wherein the first lamination (131) is provided with a plurality of first through holes (1311) for constructing the first passages, the second lamination (132) is provided with a plurality of second through holes (1321) for constructing the second passages, and the first through holes (1311) are larger in size than the second through holes (1321).

3. The rotor assembly (10) of claim 1, wherein the retainer (16) includes a seal post (161) filled in the first channel and a positioning post (162) filled in the second channel, the seal post (161) and the positioning post (162) being integrally disposed.

4. The rotor assembly (10) of claim 2 wherein each of the second passages communicates simultaneously with at least two of the first passages, at least two of the first passages communicating with the second passages being spaced apart.

5. The rotor assembly (10) of claim 4, wherein the first laminations (131) are of a circular ring structure and comprise first bosses (1312) radially protruding on an inner ring thereof, and a plurality of the first bosses (1312) are circumferentially and uniformly distributed in the first laminations (131);

at least two first through holes (1311) are formed in the same first boss (1312).

6. The rotor assembly (10) of claim 5, wherein the second lamination (132) is of a circular ring structure and comprises second bosses (1322) protruding radially on an inner ring thereof, and a plurality of the second bosses (1322) are distributed uniformly on the inner ring of the second lamination (132);

the second through hole (1321) is provided on the second boss (1322).

7. The rotor assembly (10) according to claim 6, wherein the first lamination (131) and the second lamination (132) have the same shape, and after the first lamination (131) and the second lamination (132) are stacked, the first bosses (1312) and the second bosses (1322) are arranged in a one-to-one correspondence, and the first through hole (1311) is communicated with the second through hole (1321).

8. The rotor assembly (10) of claim 7, wherein the rotor assembly (10) further comprises a plurality of magnetic steels (17) fixed within the rotor core (13);

rotor core (13) still seted up a plurality of fixed slots (133) that are used for fixing magnet steel (17) along the axial, fixed slot (133) run through along the axial rotor core (13).

9. The rotor assembly (10) according to claim 8, wherein the first boss (1312) and the second boss (1322) are provided with a first hook (1331) and a second hook (1332) at two sides thereof, the first hook (1331) and the second hook (1332) are arranged oppositely, and the first hook (1331) and the second hook (1332) are oppositely arranged on two adjacent first bosses (1312) and/or two adjacent second bosses (1322) and are configured as a fixing cavity (1333) for accommodating the magnetic steel (17);

when the first lamination sheets (131) and the second lamination sheets (132) are overlapped to form the rotor core (13), the fixing cavities (1333) are in one-to-one correspondence and extend along the axial direction to be constructed as the fixing grooves (133).

10. The rotor assembly (10) according to claim 1, wherein the end cover (11) is hollow inside, and the rotor core (13) is coaxially sleeved in the end cover (11);

a plurality of radiating blades (111) are arranged on the periphery of the end cover (11), gaps are formed between every two adjacent radiating blades (111), and openings communicated with the inner cavity of the end cover (11) are formed in the gaps.

11. An electrical machine, comprising a rotor assembly (10) according to any one of claims 1-10, and further comprising a stator assembly (20) coaxially engaged with the rotor assembly (10), wherein the stator assembly (20) comprises a stator seat (21) and a stator core (22) fitted over the stator seat (21), and a first bearing (23) and a second bearing (24) disposed in the stator core;

and a plurality of stator windings (25) are arranged on the stator iron core (22).

12. The electrical machine according to claim 11, wherein a rotating shaft (12) is arranged through the stator seat (21), a first accommodating cavity (211) and a second accommodating cavity (212) for accommodating the first bearing (23) and the second bearing (24) are further arranged in the stator seat (21), and the first accommodating cavity (211) and the second accommodating cavity (212) are coaxially arranged.

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