CN111769665B

CN111769665B - Vibration damping rotor assembly and motor with same

Info

Publication number: CN111769665B
Application number: CN202010550009.5A
Authority: CN
Inventors: 李文瑞; 王洪晓; 邵非非; 李虎
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2023-01-31
Anticipated expiration: 2040-06-16
Also published as: CN111769665A

Abstract

The invention discloses a vibration reduction rotor assembly and a motor with the same, wherein the vibration reduction rotor assembly comprises a rotor iron core with a magnet groove and a rotating shaft hole, a permanent magnet arranged in the magnet groove, a rotating shaft arranged in the rotating shaft hole, a first end vibration reduction piece arranged on a first end surface of the rotor iron core, an outer rotor iron core arranged on the first end surface of the rotor iron core, and a second end vibration reduction piece arranged in the outer rotor iron core and connected with a second end surface of the rotor iron core, wherein a first end and a second end of the rotating shaft extend out of the rotating shaft hole, the first end vibration reduction piece is directly matched with the rotating shaft or matched with the rotating shaft through a first transmission piece arranged in the first end vibration reduction piece, and the second end vibration reduction piece is directly matched with the rotating shaft or matched with the rotating shaft through a second transmission piece arranged in the second end vibration reduction piece. The vibration reduction rotor assembly provided by the embodiment of the invention has the advantages of large material quantity of the vibration reduction piece, good noise reduction and vibration reduction effects and high reliability.

Description

Vibration damping rotor assembly and motor with same

Technical Field

The invention relates to the technical field of motors, in particular to a vibration damping rotor assembly and a motor with the same.

Background

Along with the increase of the power density of the motor, the energy density of the motor is increased, and the magnetic field of the motor tends to be deeply saturated, so that the electromagnetic noise is increased. In the related art, in order to reduce electromagnetic vibration and noise caused by torque fluctuation in the operation process of a motor, a damping material is filled between a rotor core and a rotating shaft or a shaft sleeve to absorb electromagnetic force waves, so that the noise of the motor is reduced, and vibration damping is realized. In the related art, the vibration damping material is filled between the rotor core and the rotating shaft or the shaft sleeve, so that the noise reduction and vibration damping effects are poor and need to be improved.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems:

in the related technology, the vibration damping rotor assembly comprises a permanent magnet, an outer iron core, a rotating shaft, an injection molding body and a vibration damping ring, wherein the injection molding body comprises an upper end plate, a lower end plate and a plastic packaging connecting part for connecting the upper end plate and the lower end plate, an annular boss axially protrudes from the upper end plate and/or the lower end plate, an inner iron core is arranged on the rotating shaft and is embedded into a groove of the annular boss, and the vibration damping ring is arranged between the inner iron core and the inner wall of the groove. On one hand, since the gap between the inner core and the inner wall of the recess is limited, the amount of material of the damper is limited, and the noise reduction and vibration damping effects are poor. On the other hand, the injection molding part and the damping ring are made of different materials, the damping ring at the end part of the outer iron core is not connected, a gap is easy to appear on the boundary surface of the injection molding part and the damping ring, the reliability problem caused by different coefficients such as thermal expansion and the like is easy to appear in the operation process, the injection molding part has small damping, and the suppression effect on electromagnetic vibration noise is not obvious. On the other hand, the vibration reduction rotor assembly needs to be subjected to two steps of injection molding and placing of the vibration reduction ring in the production process, the process is complex, and the reject ratio is high during mass production.

The invention aims to solve one of the technical problems in the related art at least to a certain extent, and can improve the material quantity of the damping piece on the premise of not influencing the magnetic circuit of an electromagnetic field so as to improve the noise reduction effect, the damping effect and the reliability.

To this end, embodiments of an aspect of the present invention provide a damped rotor assembly capable of increasing the amount of material of the damping member, having good noise and vibration damping effects, and having high reliability.

Embodiments of another aspect of the present invention provide an electric machine having the vibration damping rotor assembly.

A vibration damping rotor assembly according to an embodiment of the first aspect of the present invention comprises: a rotor core having a magnet slot and a rotation shaft hole; the permanent magnet is arranged in the magnet groove; the rotating shaft is arranged in the rotating shaft hole, a first end and a second end of the rotating shaft extend out of the rotating shaft hole, and a gap is formed between the rotating shaft and the rotor iron core; the first end part vibration damping piece is connected with the first end face of the rotor core and is directly matched with the rotating shaft or is matched with the rotating shaft through a first transmission piece arranged in the first end part vibration damping piece; the outer rotor iron core is annular and is positioned at the second end of the rotor iron core; and the second end part vibration reduction piece is arranged in the outer rotor iron core and is connected with the second end surface of the rotor iron core, and the second end part vibration reduction piece is directly matched with the rotating shaft or is matched with the rotating shaft through a second transmission piece arranged in the second end part vibration reduction piece.

According to the rotor assembly provided by the embodiment of the invention, the first end part vibration reduction piece is directly matched with the rotating shaft or is matched with the rotating shaft through the first transmission piece arranged in the first end part vibration reduction piece, and meanwhile, the second end part vibration reduction piece is directly matched with the rotating shaft or is matched with the rotating shaft through the second transmission piece arranged in the second end part vibration reduction piece, so that the rotating shaft is prevented from being rigidly connected with the rotor core, the material quantity of the vibration reduction piece is large, and the noise reduction and vibration reduction effects are good; the problem of different thermal expansion coefficients does not exist, the reliability of the rotor assembly is improved, only the vibration damping piece needs to be arranged in the production process, the preparation process is simple, and the reject ratio of mass production is reduced.

In some embodiments, when the first end vibration damper is engaged with the rotating shaft through the first transmission member, a portion of the first end vibration damper is also directly engaged with the rotating shaft.

In some embodiments, a minimum distance between the first transmission member and the rotor core in an axial direction of the rotor core is greater than or equal to 0.3 mm.

In some embodiments, a portion of the second end damping member also directly engages the shaft when the second end damping member engages the shaft via the second transmission member.

In some embodiments, a minimum distance between the second transmission member and the rotor core in an axial direction of the rotor core is equal to or greater than 0.3 mm.

In some embodiments, the vibration damping rotor assembly further comprises another outer rotor core, the other outer rotor core is annular and located at the first end of the rotor core, and the first end vibration damping member is disposed in the other outer rotor core.

In some embodiments, the inner peripheral wall of the other outer rotor core is provided with first radial protrusions and first radial grooves between the first radial protrusions, the outer peripheral wall of the first end damper is provided with first damper radially outer protrusions and first damper radially outer open grooves between the first damper radially outer protrusions, the first radial protrusions are fitted in the first damper radially outer open grooves, and the first damper radially outer protrusions are fitted in the first radial grooves.

In some embodiments, be equipped with first transmission radial outside protruding and being located on the periphery wall of first transmission piece first transmission radial outside is protruding to the open slot between, be equipped with first damping radial inside protruding and be located on the interior perisporium of first end damping piece first damping radial inside open slot between the arch, first transmission radial outside protruding cooperation is in the first damping radial inside open slot, first damping radial inside protruding cooperation is in the first transmission radial inside open slot.

In some embodiments, the first radial groove, the first damper radially outer open groove, the first drive radially open groove, and the first damper radially inner open groove are tapered grooves.

In some embodiments, the rotor core has an axial through bore between adjacent magnet slots, the axial through bore having an outer damping web therein, a first end of the outer damping web being connected to the first end damping member and a second end of the outer damping web being connected to the second end damping member.

In some embodiments, the first end vibration dampener, the second end vibration dampener and the vibration dampening tie-bar are integrally injection molded from a viscoelastic material.

An electric machine according to an embodiment of the second aspect of the invention comprises a rotor assembly as described in any of the embodiments above.

According to the motor provided by the embodiment of the invention, the rotor assembly is directly matched with the rotating shaft through the first end part vibration damping piece or is matched with the rotating shaft through the first transmission piece arranged in the first end part vibration damping piece, and meanwhile, the rotating shaft is prevented from being rigidly connected with the rotor core through the direct matching of the second end part vibration damping piece and the rotating shaft or the matching of the second transmission piece arranged in the second end part vibration damping piece and the rotating shaft, and the vibration damping piece has the advantages of large material quantity, good noise reduction and vibration damping effects and high reliability.

Drawings

Fig. 1 is a perspective view of a rotor assembly according to a first embodiment of the present invention.

Fig. 2 is a schematic view of an assembled state of the vibration damping rotor assembly shown in fig. 1.

Fig. 3 is another schematic view of an assembled state of the vibration damping rotor assembly shown in fig. 1.

Fig. 4 is a perspective view of a rotor assembly according to a second embodiment of the present invention.

Fig. 5 is a schematic view of an assembled state of the vibration damping rotor assembly shown in fig. 4.

Fig. 6 is another schematic view of an assembled state of the vibration damping rotor assembly shown in fig. 4.

Fig. 7 is a perspective view of a rotor assembly according to a third embodiment of the present invention.

Fig. 8 is a schematic view of an assembled state of the vibration damping rotor assembly shown in fig. 7.

FIG. 9 is a schematic view of a half-bridge punch of a damped rotor assembly in accordance with an embodiment of the present invention.

FIG. 10 is a schematic view of a fully bridged punch of a damped rotor assembly in accordance with an embodiment of the present invention.

FIG. 11 is a graph comparing the damping ratio of a vibration damped rotor assembly according to an embodiment of the present invention with the prior art.

Reference numerals:

the vibration-damped rotor assembly 100 is,

the rotor core 10, the rotating shaft hole 101, the magnet slot 102, the axial through hole 103, the gap 105, the full bridge punching sheet 110, the half bridge punching sheet 120, the punching sheet body part 111, the outer magnetic bridge 112, the inner magnetic bridge 113, the magnetic pole 114, the protrusion 115,

the permanent magnet (20) is provided with a permanent magnet,

the rotation shaft 30 is provided with a rotation shaft,

a structural member 40, another outer rotor core 45, a first radial projection 450, a first radial groove 451, an outer rotor core 44, a second radial projection 440, a second radial groove 441,

the transmission piece 50, the first transmission piece 51, the first transmission radial protrusion 510, the first transmission radial opening groove 511, the second transmission piece 52, the second transmission radial protrusion 520 and the second transmission radial opening groove 521.

Damping piece 60, first end damping piece 61, first damping radially outer open groove 613, first damping radially outer protrusion 614, first damping radially inner open groove 615, first damping radially inner protrusion 616, first center hole 617, second end damping piece 62, second damping radially outer open groove 623, second damping radially outer protrusion 624, second damping radially inner open groove 625, second damping radially inner protrusion 626, second center hole 627, outer damping connecting strip 63.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 to 11, a vibration damping rotor assembly 100 according to an embodiment of the present invention includes a rotor core 10, a permanent magnet 20, a rotation shaft 30, a vibration damping member 60, a structural member 40, and a transmission member 50.

The rotor core 10 has a rotating shaft hole 101 and a magnet groove 102. As shown in fig. 1, 4, 7, and 9, the rotary shaft hole 101 is provided at a substantially central position of the rotor core 10 and penetrates the rotor core 10 in an axial direction of the rotor core 10 (a left-right direction in fig. 1, 4, 7, and 9). The magnet grooves 102 are provided in plural, and the plural magnet grooves 102 are arranged at regular intervals around the rotation shaft hole 101 in the circumferential direction of the rotor core 10.

The permanent magnets 20 are disposed in the magnet slots 102. As shown in fig. 1, 4, 7 and 9, the permanent magnet 20 is plural, and one permanent magnet 20 is installed in each magnet slot 102 such that the plural permanent magnets 20 are arranged at intervals in the circumferential direction of the rotor core 10.

The rotating shaft 30 is disposed in the rotating shaft hole 101 with a gap between the rotating shaft 30 and the rotor core 10, and a first end (left end of the rotating shaft 30 in fig. 1 to 8) and a second end (right end of the rotating shaft 30 in fig. 1 to 8) of the rotating shaft 30 protrude from the rotating shaft hole 101. As shown in fig. 1 to 8, the axial direction of the rotary shaft 30 is substantially coincident with the axial direction of the rotor core 10 and is inserted into the rotor core 10 through the rotary shaft hole 101.

The damper 60 includes a first end damper 61, and the first end damper 61 is provided on a first end surface (a left end surface of the rotor core 10 in fig. 1 to 8) of the rotor core 10 and connected to the rotor core 10. As shown in fig. 1, the first end damper 61 is directly engaged with the rotating shaft 30, and the rotor core 10 drives the rotating shaft 30 through the first end damper 61. Alternatively, as shown in fig. 3, 4, 6, and 7, the first end damping member 61 is engaged with the rotating shaft 30 via a first transmission member 51 provided in the first end damping member 61, and the rotor core 10 drives the rotating shaft 30 via the first end damping member 61 and the first transmission member 51.

The structural member 40 includes an outer rotor core 44, as shown in fig. 1, 4 and 7, the outer rotor core 44 is annular and is located at the second end of the rotor core 10. Specifically, the outer rotor core 44 is a radially inner disconnected structure, and is formed by combining end laminations in a rivet joint manner and connecting the end laminations with middle laminations in a rivet joint manner, so that an enough space is formed between the outer rotor core and the rotor core to fill a damping part with damping property to absorb vibration energy.

The vibration damping member 60 further includes a second end vibration damping member 62, the second end vibration damping member 62 is disposed on a second end surface (a left end surface of the rotor core 10 in fig. 2 to 8) of the rotor core 10 and connected to the rotor core 10, the second end vibration damping member 62 is directly engaged with the rotating shaft 30, and the rotor core 10 drives the rotating shaft 30 through the second end vibration damping member 62. Alternatively, as shown in fig. 3, 4, 6, and 7, the second end damping member 62 is engaged with the rotating shaft 30 through the second transmission member 52 provided in the second end damping member 62, and the rotor core 10 drives the rotating shaft 30 through the second end damping member 62 and the second transmission member 52 together.

As shown in fig. 1 to 8, the first end damper 61 is connected to the left end surface of the rotor core 10, the second end damper 62 is connected to the right end surface of the rotor core 10, and the rotating shaft 30 penetrates the rotor core 10, the first end damper 61, and the second end damper 62 in the left-right direction.

The inner periphery of the first end damper 61 is directly engaged with the outer periphery of the rotating shaft 30, or the first end damper 61 is engaged with the rotating shaft 30 via the first transmission member 51 provided in the first end damper 61.

The second end vibration damping member 62 is directly engaged with the rotary shaft 30, or the second end vibration damping member 62 is engaged with the rotary shaft 30 through the second transmission member 52 provided in the second end vibration damping member 62.

Therefore, when the rotor core 10 rotates, the first end vibration damping member 61 and the first transmission member 51 disposed in the first end vibration damping member 61 are driven to rotate, and the second end vibration damping member 62 and the second transmission member 52 disposed in the second end vibration damping member 62 are driven to rotate, so that the rotating shaft 30 is driven to rotate.

According to the rotor assembly provided by the embodiment of the invention, the rotor assembly is directly matched with the rotating shaft through the first end part vibration damping part or is matched with the rotating shaft through the first transmission part arranged in the first end part vibration damping part, and meanwhile, the rotating shaft is prevented from being rigidly connected with the rotor core through the direct matching of the second end part vibration damping part and the rotating shaft or the matching of the second transmission part arranged in the second end part vibration damping part and the rotating shaft, the material quantity of the vibration damping part is large, and the noise reduction and vibration damping effects are good; the problem of different thermal expansion coefficients does not exist, the reliability of the rotor assembly is improved, only the vibration damping piece needs to be arranged in the production process, the preparation process is simple, and the reject ratio of mass production is reduced.

In some embodiments, the material of the first end vibration dampening member 61 and the second end vibration dampening member 62 are both viscoelastic materials, such as rubber, thermoplastic materials, and the like. The vibration damping device can greatly absorb energy generated due to resonance by adopting the viscoelastic material, and achieves a vibration damping effect.

As shown in FIG. 11, the damping ratio of the rotor can be greatly improved by designing the rotor core end face to be a full-viscoelastic material, and compared with the end structure of a common rotor (rigidly connected) and an injection molding part (end plate) and a vibration damping ring, the damping ratio of the end structure adopting the full-viscoelastic material is larger.

In some embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15, so that the electromagnetic waves can be effectively absorbed and attenuated when the motor rotor runs.

Further, the Shore hardness of the viscoelastic material is 20-80 degrees, so that the manufacturability of the motor is improved. For example, shore hardness is 30 degrees, 40 degrees, 50 degrees.

In some embodiments, when the first end vibration damper 61 is engaged with the rotating shaft 30 through the first transmission member 51, a portion of the first end vibration damper 61 is also directly engaged with the rotating shaft 30.

For example, the rotating shaft 30 sequentially penetrates the first transmission member 51 and a part of the first end damper 61 and the rotor core 10 in a left-to-right direction, and the first transmission member 51 and a part of the first end damper 61 and the rotor core 10 are directly engaged with the rotating shaft 30. Therefore, when the rotor core 10 rotates, the first end damping member 61 is driven to rotate, and the rotating shaft 30 is driven to rotate by a part of the first end damping member 61 and the first transmission member 51.

In some embodiments, the minimum distance between the first transmission member 51 and the rotor core 10 in the axial direction of the rotor core 10 is equal to or greater than 0.3 mm. Therefore, the connection between the damping piece and the rotor core is more reliable while the material quantity of the damping piece is increased.

In some embodiments, when the second end damping member 62 is engaged with the rotating shaft 30 via the second transmission member 52, a portion of the second end damping member 62 is also directly engaged with the rotating shaft 30.

For example, the rotating shaft 30 sequentially penetrates the rotor core 10, a part of the second end vibration damper 62, and the second transmission member 52 from the left to the right, and the rotor core 10, the part of the second end vibration damper 62, and the second transmission member 52 are directly engaged with the rotating shaft 30. Accordingly, when the rotor core 10 rotates, the second end vibration damper 62 rotates, and the rotating shaft 30 is driven to rotate by a portion of the second end vibration damper 62 and the second transmission member 52.

In some embodiments, the minimum distance between the second transmission member 52 and the rotor core 10 in the axial direction of the rotor core 10 is equal to or greater than 0.3 mm. Thereby, the connection of the damper to the rotor core is made more reliable while the amount of material of the damper is increased.

In some embodiments, damped rotor assembly 100 further includes another outer rotor core 45, with another outer rotor core 45 being annular and located at a first end of rotor core 10. The other outer rotor core 45 is disposed at the outer circumference of the first end vibration absorber 61, and a vibration absorbing gap is formed between the other outer rotor core 45 and the permanent magnet 20 and the outer rotor core 44 to fill a vibration absorber of a damping property to absorb vibration energy.

Specifically, the inner peripheral wall of the other outer rotor core 45 is provided with first radial projections 450 and first radial grooves 451 between the first radial projections 450. As shown in fig. 7, the inner peripheral wall of the other outer rotor core 45 is provided with a plurality of first radial protrusions 450 and a plurality of first radial grooves 451, the plurality of first radial protrusions 450 are arranged at intervals in the circumferential direction of the rotor core 10, and one first radial groove 451 is formed between every two adjacent first radial protrusions 450.

In some embodiments, the first end damper 61 is provided inside the other outer rotor core 45. The outer peripheral wall of the first end damper piece 61 is provided with first damper radially outward protrusions 614 and first damper radially outward opening grooves 613 between the first damper radially outward protrusions 614, the first radially outward protrusions 450 are fitted in the first damper radially outward opening grooves 613, and the first damper radially outward protrusions 614 are fitted in the first radially outward grooves 451.

As shown in fig. 7, the outer peripheral wall of the first end damper piece 61 is provided with a plurality of first damper radially outer protrusions 614 and a plurality of first damper radially outer open grooves 613, the plurality of first damper radially outer protrusions 614 are arranged at intervals in the circumferential direction of the rotor core 10, and one first damper radially outer open groove 613 is formed between every adjacent two first damper radially outer protrusions 614. The first end damper piece 61 is disposed in the other outer rotor core 45, and the first damper radial projection 616 is fitted in the first radial groove 451, and the first radial projection 450 is fitted in the first damper radially outer opening groove 613.

In some embodiments, the outer peripheral wall of the first transmission member 51 is provided with first transmission radially outer protrusions 510 and first transmission radially outer open grooves 511 located between the first transmission radially outer protrusions 510, the inner peripheral wall of the first end vibration damper 61 is provided with first vibration damping radially inner protrusions 616 and first vibration damping radially inner open grooves 615 located between the first vibration damping radially inner protrusions 616, the first transmission radially outer protrusions 510 are fitted in the first vibration damping radially inner open grooves 615, and the first vibration damping radially inner protrusions 616 are fitted in the first transmission radially outer open grooves 511.

As shown in fig. 7, the outer circumferential wall of the first transmission member 51 is provided with a plurality of first transmission radial protrusions 510 and a plurality of first transmission radial opening grooves 511, the plurality of first transmission radial protrusions 510 are arranged at intervals along the circumferential direction of the rotor core 10, and one first transmission radial opening groove 511 is formed between every two adjacent first transmission radial protrusions 510.

The first end damping part 61 has a plurality of first damping radial protrusions 616 and a plurality of first radially damping inward opening grooves 615 on a circumferential wall of a first center hole 617, the plurality of first damping radial protrusions 616 are arranged at intervals in the circumferential direction of the rotor core 10, and one first radially damping inward opening groove 615 is formed between every two adjacent first damping radial protrusions 616.

The first transmission member 51 is disposed within the first end damping member 61 with the first transmission radial projection 510 engaged within the first radially damping inwardly opening groove 615 and the first damping radial projection 616 engaged within the first transmission radial opening groove 511.

In some embodiments, the inner circumferential wall of the outer rotor core 44 is provided with second radial protrusions 440 and second radial grooves 441 between the second radial protrusions 440.

The outer peripheral wall of the second end damper member 62 is provided with second damper radially outward protrusions 624 and second damper radially outward opening grooves 623 located between the second damper radially outward protrusions 624, the second radial protrusions 440 fit in the second damper radially outward opening grooves 623, and the second damper radially outward protrusions 624 fit in the second radial grooves 441.

As shown in fig. 1, 4, and 7, the outer peripheral wall of the second end damper 62 is provided with a plurality of second damper radially outward protrusions 624 and a plurality of second damper radially outward open grooves 623, the plurality of second damper radially outward protrusions 624 are arranged at intervals in the circumferential direction of the rotor core 10, and two second damper radially outward open grooves 623 are formed between every two adjacent second damper radially outward protrusions 624.

A plurality of first radial protrusions 440 and a plurality of first radial grooves 441 are provided on the inner circumferential wall of the outer rotor core 44, the plurality of first radial protrusions 440 are arranged at intervals in the circumferential direction of the rotor core 10, one first radial groove 441 is formed between every adjacent two first radial protrusions 440, the second end vibration damping member 62 is provided in the outer rotor core 44, and the second vibration damping radial protrusion 626 is fitted in the first radial groove 441, and the first radial protrusions 440 are fitted in the second vibration damping radially outer opening groove 623.

In some embodiments, the outer peripheral wall of the second transmission member 52 is provided with a second transmission radially outer protrusion 520 and a second transmission radially outer opening groove 521 located between the second transmission radially outer protrusions 520, the inner peripheral wall of the second end vibration damping member 62 is provided with a second vibration damping radially inner protrusion 626 and a second vibration damping radially inner opening groove 625 located between the second vibration damping radially inner protrusions 626, the second transmission radially outer protrusion 520 fits within the second vibration damping radially inner opening groove 625, and the second vibration damping radially inner protrusion 626 fits within the second transmission radially opening groove 521.

As shown in fig. 1, 4, and 7, a plurality of second transmission radial protrusions 520 and a plurality of second transmission radial opening grooves 521 are provided on the outer circumferential wall of the second transmission piece 52, the plurality of second transmission radial protrusions 520 are arranged at intervals along the circumferential direction of the rotor core 10, and two second transmission radial opening grooves 521 are formed between every two adjacent second transmission radial protrusions 520.

The circumferential wall of the second center hole 627 of the second end damper 62 is provided with a plurality of second damper radial protrusions 626 and a plurality of second radial damper inward opening grooves 625, the plurality of second damper radial protrusions 626 are arranged at intervals in the circumferential direction of the rotor core 10, and two second radial damper inward opening grooves 625 are formed between every two adjacent second damper radial protrusions 626.

Second transmission member 52 is disposed within second end damping member 62 with second transmission radial projection 520 engaged within second radially damping inwardly opening groove 625 and second damping radial projection 626 engaged within second transmission radial opening groove 521.

In some embodiments, as shown in fig. 1-8, the first radial groove 451, the first damper radially outer opening groove 613, the first drive radial opening groove 511, the first damper radially inner opening groove 615, and the second radial groove 441 are tapered grooves. The cone angle of the cone-shaped groove can be designed to be more than or equal to 5 degrees, and the cone-shaped groove tapers outwards in the radial direction, so that the combination acting force between the matched parts can be improved, and the cone-shaped groove is firmer. Especially under low temperature environment, can effectively prevent through the cooperation of above-mentioned structural style between damping piece and the driving medium that the damping piece breaks away from the driving medium because of the low temperature shrinkage factor is bigger relatively to can promote the reliability of damping rotor subassembly. And, having strengthened being connected of damping piece and rotor core between outer rotor core and the damping piece through above-mentioned structural style cooperation, difficult breaking away from has improved stability.

In some embodiments, as shown in fig. 1-9, rotor core 10 has an axial through bore 103 between adjacent magnet slots 102, with outer damping tie bars 63 within axial through bore 103, first ends of outer damping tie bars 63 (e.g., left ends of outer damping tie bars 63 in fig. 1-9) being connected to first end damping members 61, and second ends of outer damping tie bars 63 being connected to second end damping members 62.

As shown in fig. 1 to 9, the outer damping connecting bars 63 are plural, and the plural outer damping connecting bars 63 are arranged at intervals in the circumferential direction of the rotor core 10. Therefore, the material quantity of the vibration damper is further increased, the noise reduction capability and the vibration reduction effect are improved, and the connection between the first end vibration damper and the rotor core and the connection between the second end vibration damper and the rotor core are more reliable.

In some embodiments, the first end vibration damping member 61, the second end vibration damping member 62 and the outer vibration damping connecting strip 63 are integrally injection molded from a viscoelastic material. Therefore, the vibration reduction piece is tightly and reliably connected with the rotor core and is not easy to separate, and the stability is improved.

In some embodiments, the first end vibration dampening member 61, the second end vibration dampening member 62 and the outer vibration dampening connecting strip 63 are made of rubber or thermoplastic material. Therefore, the first end vibration damping piece 61, the second end vibration damping piece 62 and the outer vibration damping connecting strip 63 have low hardness and rigidity, and the vibration damping effect is good. Meanwhile, the manufacturing can be realized through injection molding, and the manufacturing process is good.

Specifically, the materials of the first end vibration damper 61, the second end vibration damper 62, the inner connection vibration damper 65, the outer connection vibration damper 63, the intermediate connection vibration damper 64, and the circumferential connection vibration damper 66 are all viscoelastic materials. This application is through filling viscoelastic material in the magnetic bridge hole with rotor core inside, tip and rotor core, can promote rotor core's damping characteristic, further improves and falls to make an uproar and damping performance.

Moreover, the viscoelastic material (first end part vibration damping piece 61 and second end part vibration damping piece 62) of rotor core terminal surface both sides can be connected, and in the actual manufacturing process, usable mould integrated into one piece both sides tip fills damping material, promotes the manufacturability of motor.

Some specific example rotor assemblies according to the invention are described below with reference to fig. 1-11.

As shown in fig. 1 to 11, the vibration damping rotor assembly 100 according to the embodiment of the present invention includes a rotor core 10, a plurality of permanent magnets 20, a rotation shaft 30, an outer rotor core 44, another outer rotor core 45, a first transmission member 51, a second transmission member 52, a first end vibration damping member 61, a second end vibration damping member 62, and an outer connection vibration damping bar 63.

The rotor core 10 has a rotation shaft hole 101, a plurality of magnet slots 102, and a plurality of axial through holes 103. The rotating shaft hole 101 is provided at a substantially central position of the rotor core 10 and penetrates the rotor core 10 in the axial direction of the rotor core 10. The plurality of magnet slots 102 are arranged at regular intervals around the rotation shaft hole 101 in the circumferential direction of the rotor core 10. An axial through hole 103 is provided between any adjacent magnet slots 102.

The rotor core 10 is formed by stacking a plurality of rotor sheets in the axial direction of the rotor core 10, wherein the full-bridge sheet 110 is located at the left portion and the right portion of the plurality of rotor sheets, and the half-bridge sheet 120 is located at the middle portion between the left portion and the right portion.

The rotor punching sheet comprises a punching sheet body part 111, an outer magnetic bridge 112, an inner magnetic bridge 113 and a magnetic pole 114. In a plurality of magnetic poles 114 of the full bridge stamped steel 110, each magnetic pole 114 is connected with the stamped steel body part 111 through an inner magnetic bridge 113, a plurality of protrusions 115 arranged at intervals are arranged on the periphery of the stamped steel body part 111, a protrusion 115 is arranged between every two adjacent inner magnetic bridges 113, and the outer magnetic bridge 112 of the full bridge stamped steel 110 is closed.

The outer magnetic bridges 112 of the half-bridge laminations 120 are broken between adjacent magnetic poles 114. Among the plurality of magnetic poles 114 of the half-bridge lamination sheet 120, a part of the magnetic poles 114 are connected with the lamination sheet main body portion 111 through the inner magnetic bridge 113, the other part of the magnetic poles 114 are spaced from the lamination sheet main body portion 111 in the radial direction of the rotor core 10, and the part of the magnetic poles 114 and the other part of the magnetic poles 114 are alternately arranged along the circumferential direction of the rotor core 10. In the adjacent half-bridge stamped sheets 120 in the middle, one half-bridge stamped sheet 120 rotates by one magnetic pole 114 relative to the other half-bridge stamped sheet 120 along the circumferential direction of the rotor core 10. Therefore, the inner magnetic bridges of the rotor core form a structure which is alternately connected and disconnected in the axial direction, the electromagnetic performance of the motor can be improved, and the energy consumption is reduced.

The plurality of permanent magnets 20 are respectively provided in the plurality of magnet slots 102 correspondingly such that the plurality of permanent magnets 20 are arranged at intervals in the circumferential direction of the rotor core 10. A gap 105 is provided between the inner surface of each permanent magnet 20 and the inner bottom surface of the corresponding magnet slot 102.

The axial direction of the rotating shaft 30 is substantially the same as the axial direction of the rotor core 10, and the rotating shaft hole 101 is formed in the rotor core 10, and a gap is formed between the rotating shaft 30 and the rotor core 10.

The first end damping member 61 is connected to the left end surface of the rotor core 10, and the first end damping member 61 is directly engaged with the rotary shaft 30 or engaged with the rotary shaft 30 through the first transmission member 51 provided in the first end damping member 61. The outer peripheral wall of the first end damper 61 is provided with a plurality of first damper radially outer protrusions 614 and a plurality of first damper radially outer open grooves 613, the plurality of first damper radially outer protrusions 614 are arranged at intervals in the circumferential direction of the rotor core 10, and one first damper radially outer open groove 613 is formed between every two adjacent first damper radially outer protrusions 614.

The first transmission piece 51 is arranged in the first end part vibration damping piece 61, a plurality of first transmission radial protrusions 510 and a plurality of first transmission radial opening grooves 511 are arranged on the outer peripheral wall of the first transmission piece 51, the plurality of first transmission radial protrusions 510 are arranged at intervals along the circumferential direction of the rotor core 10, and one first transmission radial opening groove 511 is formed between every two adjacent first transmission radial protrusions 510.

The other outer rotor core 45 is annular and located at the left end of the rotor core 10, and the first end vibration damping member 61 is disposed in the other outer rotor core 45. The inner peripheral wall of the other outer rotor core 45 is provided with a plurality of first radial protrusions 450 and a plurality of first radial grooves 451, the plurality of first radial protrusions 450 are arranged at intervals in the circumferential direction of the rotor core 10, one first radial groove 451 is formed between every adjacent two first radial protrusions 450, the first end damper 61 is provided in the other outer rotor core 45, and the first damper radial protrusions 616 are fitted in the first radial grooves 451, and the first radial protrusions 450 are fitted in the first damper radially outer opening grooves 613.

The outer rotor core 44 is annular and located at the second end of the rotor core 10, the inner peripheral wall of the outer rotor core 44 is provided with second radial protrusions 440 and second radial grooves 441 located between the second radial protrusions 440, the outer peripheral wall of the second end vibration damping member 62 is provided with second vibration damping radially outward protrusions 624 and second vibration damping radially outward opening grooves 623 located between the second vibration damping radially outward protrusions 624, the second radial protrusions 440 are fitted in the second vibration damping radially outward opening grooves 623, and the second vibration damping radially outward protrusions 624 are fitted in the second radial grooves 441.

The second end vibration damping member 62 is provided in the outer rotor core 44 and connected to the right end surface of the rotor core 10, and the second end vibration damping member 62 is engaged with the rotary shaft 30 directly or through the second transmission member 52 provided in the second end vibration damping member 62. The second end damper 62 has a plurality of second damper radial protrusions 626 and a plurality of second radially damper inward opening grooves 625 formed in a circumferential wall of the second center hole 627, the plurality of second damper radial protrusions 626 are arranged at intervals in the circumferential direction of the rotor core 10, and one second radially damper inward opening groove 625 is formed between every two adjacent second damper radial protrusions 626.

Second transmission member 52 is disposed within second end damping member 62 with second transmission radial projection 520 engaged within second radially damping inwardly opening groove 625 and second damping radial projection 626 engaged within second transmission radial opening groove 521. The outer circumferential wall of the second transmission member 52 is provided with a plurality of second transmission radial protrusions 520 and a plurality of second transmission radial opening grooves 521, the plurality of second transmission radial protrusions 520 are arranged at intervals along the circumferential direction of the rotor core 10, and one second transmission radial opening groove 521 is formed between every two adjacent second transmission radial protrusions 520.

The outer vibration damping connecting strips 63 are plural, and the plural outer vibration damping connecting strips 63 are arranged at intervals in the circumferential direction of the rotor core 10. A first end of the outer damping web 63 (e.g., the left end of the outer damping web 63 in fig. 1-9) is connected to the first end damping member 61, and a second end of the outer damping web 63 is connected to the second end damping member 62. Therefore, the material quantity of the vibration damper is further increased, the noise reduction capability and the vibration reduction effect are improved, and the connection between the first end vibration damper and the rotor core and the connection between the second end vibration damper and the rotor core are more reliable.

The specific process of the rotor assembly according to the embodiment of the present invention may be as follows:

respectively manufacturing a rotor iron core, a permanent magnet, a structural member and a rotating shaft;

sleeving the rotor iron core on the rotating shaft through the rotating shaft hole;

putting the assembled rotor iron core, the structural member and the rotating shaft into a mold, positioning, and correspondingly inserting a plurality of permanent magnets into a plurality of magnet grooves of the rotor iron core respectively;

the rotor core, the permanent magnet, the structural member and the rotating shaft are molded into an integral plastic-coated structure by using rubber or thermoplastic materials through an injection molding process, wherein the structure formed by the rubber or thermoplastic materials is the vibration damping member.

A motor according to an embodiment of the present invention includes the vibration damping rotor assembly 100 of any of the above embodiments.

According to the motor provided by the embodiment of the invention, the rotor assembly is directly matched with the rotating shaft through the first end part vibration damping piece or is matched with the rotating shaft through the first transmission piece arranged in the first end part vibration damping piece, and meanwhile, the rotating shaft is prevented from being rigidly connected with the rotor core through the direct matching of the second end part vibration damping piece and the rotating shaft or the matching of the second transmission piece arranged in the second end part vibration damping piece and the rotating shaft, and the vibration damping piece has large material quantity and good noise reduction and vibration damping effects.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships 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 referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, 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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A damped rotor assembly, comprising:

a rotor core having a magnet slot and a rotating shaft hole;

the permanent magnet is arranged in the magnet groove;

the rotating shaft is arranged in the rotating shaft hole, a first end and a second end of the rotating shaft extend out of the rotating shaft hole, and a gap is formed between the rotating shaft and the rotor iron core;

the first end part vibration damping piece is connected with the first end face of the rotor core and is directly matched with the rotating shaft or is matched with the rotating shaft through a first transmission piece arranged in the first end part vibration damping piece;

the outer rotor iron core is annular and is positioned at the second end of the rotor iron core;

and the second end vibration reduction piece is arranged in the outer rotor iron core and is connected with the second end surface of the rotor iron core, and the second end vibration reduction piece is directly matched with the rotating shaft or is matched with the rotating shaft through a second transmission piece arranged in the second end vibration reduction piece.

2. The damped rotor assembly of claim 1, wherein a portion of the first end damping member is further directly engaged with the rotatable shaft when the first end damping member is engaged with the rotatable shaft by the first transmission member.

3. The damped rotor assembly of claim 2 wherein a minimum distance between the first transmission member and the rotor core in an axial direction of the rotor core is 0.3 mm or greater.

4. The damped rotor assembly according to claim 1 wherein a portion of the second end damping member is also directly engaged with the rotating shaft when the second end damping member is engaged with the rotating shaft by the second transmission member.

5. The damped rotor assembly of claim 4 wherein a minimum distance between the second transmission member and the rotor core in an axial direction of the rotor core is 0.3 mm or greater.

6. The damped rotor assembly of any one of claims 1-5 further comprising another outer rotor core, the another outer rotor core being annular and located at a first end of the rotor core, the first end damper being disposed within the another outer rotor core.

7. The damped rotor assembly according to claim 6 wherein the inner peripheral wall of the other outer rotor core is provided with first radial protrusions and first radial grooves between the first radial protrusions, the outer peripheral wall of the first end damper is provided with first damped radially outer protrusions and first damped radially outer open grooves between the first damped radially outer protrusions, the first radial protrusions are fitted in the first damped radially outer open grooves, and the first damped radially outer protrusions are fitted in the first radial grooves.

8. The vibration damping rotor assembly according to claim 7, wherein the outer peripheral wall of the first transmission member is provided with first transmission radially outward protrusions and first transmission radially open grooves located between the first transmission radially outward protrusions, the inner peripheral wall of the first end vibration damping member is provided with first vibration damping radially inward protrusions and first vibration damping radially inward open grooves located between the first vibration damping radially inward protrusions, the first transmission radially outward protrusions are matched in the first vibration damping radially inward open grooves, and the first vibration damping radially inward protrusions are matched in the first transmission radially open grooves.

9. The damped rotor assembly of claim 8 wherein the first radial recess, the first damped radially outer open groove, the first drive radially open groove, and the first damped radially inner open groove are tapered grooves.

10. The dampened rotor assembly of claim 1 wherein said rotor core has an axial through bore between adjacent magnet slots with an outer dampened web therein, said outer dampened web having a first end connected to said first end dampening member and a second end connected to said second end dampening member.

11. The dampened rotor assembly of claim 10 wherein said first end dampening member, said second end dampening member and said dampened connector strip are integrally injection molded from a viscoelastic material.

12. An electrical machine comprising a damped rotor assembly according to any one of claims 1 to 11.