CN111769666A - Rotor assembly and motor having it - Google Patents

Abstract

The invention discloses a rotor assembly and a motor having the same. The rotor assembly includes a rotor iron core, a permanent magnet, a rotating shaft, a transmission part and a second end vibration damping part. The rotor iron core is provided with a magnet slot and a rotating shaft hole; In the magnet slot; the rotating shaft is set in the rotating shaft hole and there is a gap between the rotating shaft and the rotor iron core, the first end and the second end of the rotating shaft protrude from the rotating shaft hole; the first end shock absorber is set in the rotor iron core The first end face of the rotor is connected to the rotor core; the transmission part is arranged in the first end vibration damping part, and the transmission part cooperates with the rotating shaft; the second end vibration damping part is arranged on the second end surface of the rotor core and is connected with the The rotor iron cores are connected, the second end vibration damping member is directly matched with the rotating shaft, and the rotor iron core drives the rotating shaft through the second end vibration damping member and sequentially through the first end vibration damping member and the transmission member. The rotor assembly of the invention increases the material quantity of the vibration damping member, has good noise reduction and vibration damping effects, and has high reliability.

Description

Rotor assembly and motor having it

technical field

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

Background technique

As the power density of the motor increases, the energy density of the motor increases, and the magnetic field of the motor tends to be deeply saturated, resulting in increased electromagnetic noise. In the related art, in order to reduce the electromagnetic vibration and noise caused by the torque fluctuation during the operation of the motor, it is usually adopted to fill the vibration damping material between the rotor iron core and the rotating shaft or the shaft sleeve to absorb the electromagnetic force wave, so as to reduce the noise of the motor and realize the Vibration reduction. In the related art, by filling the vibration damping material between the rotor iron core and the rotating shaft or the shaft sleeve, the effect of noise reduction and vibration damping is poor and needs to be improved.

SUMMARY OF THE INVENTION

The present invention is made based on the inventors' findings and understanding of the following facts and problems:

In the related art, the vibration-damping rotor assembly includes a permanent magnet, an outer iron core, a rotating shaft, an injection-molded body, and a vibration-damping ring. The injection-molded body includes an upper end plate, a lower end plate, and a plastic-encapsulated connecting portion connecting the upper end plate and the lower end plate. An annular boss is axially protruded from the lower end plate, the inner iron core is mounted on the rotating shaft and embedded in the 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 the one hand, due to the limited gap between the inner iron core and the inner wall of the groove, the material amount of the vibration damping member is limited, and the noise reduction and vibration damping effect is poor. On the other hand, the material of the injection molded parts is different from that of the damping ring, the damping ring at the end of the outer iron core is not connected, the boundary interface between the injection molded part and the damping ring is prone to gaps, and the different coefficients of thermal expansion are prone to occur during operation. In addition, the damping of the injection molded parts is small, and the suppression effect on electromagnetic vibration and noise is not obvious. On the other hand, the vibration-damping rotor assembly requires two steps of injection molding and placement of the vibration-damping ring in the production process. The process is complicated, and the defect rate is high in mass production.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the embodiments of the present invention propose a method that can increase the material amount of the vibration damping member and reduce the Rotor assembly with high noise and vibration damping effect and high reliability.

An embodiment of another aspect of the present invention also provides a motor.

The rotor assembly according to the embodiment of the first aspect of the embodiments of the present invention includes: a rotor iron core, the rotor iron core has a magnet slot and a shaft hole; a permanent magnet, the permanent magnet is provided in the magnet slot; a rotating shaft, The rotating shaft is arranged in the rotating shaft hole and there is a gap between the rotating shaft and the rotor iron core, and the first end and the second end of the rotating shaft protrude from the rotating shaft hole; Vibration member, the first end vibration damping member is arranged on the first end surface of the rotor iron core and connected with the rotor iron core; transmission member, the transmission member is arranged on the first end portion to reduce vibration In the part, the transmission part is matched with the rotating shaft; the second end vibration damping part is arranged on the second end surface of the rotor iron core and is connected with the rotor iron core , the second end damping member is directly matched with the rotating shaft, and the rotor core is driven by the second end damping member and sequentially through the first end damping member and the transmission member the shaft.

According to the rotor assembly of the embodiment of the present invention, by arranging the first end vibration damping member on the first end face of the rotor iron core, which is matched with the rotating shaft through the transmission member, the rigid connection between the rotating shaft and the rotor iron core is avoided, and the transmission member improves the stability of the rotating shaft. Rotation effect, and the material of the vibration damping parts is large, the noise reduction and vibration reduction effect is good, there is no problem of different thermal expansion coefficients, and the reliability of the rotor assembly is improved, and only the vibration damping parts are required in the production process, and the preparation process is related. Simple, reducing the defect rate of mass production.

In some embodiments, a part of the first end damping member is directly matched with the rotating shaft, and the rotor core passes through the part of the first end damping member and sequentially passes through the first end damping member The end damping member and the transmission member drive the rotating shaft.

In some embodiments, the materials of the first end damper and the second end damper are both viscoelastic materials.

In some embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15.

In some embodiments, the viscoelastic material has a Shore hardness of 20-80 degrees.

In some embodiments, the transmission member includes a base body and a boss, the boss protrudes from the base body toward the first end surface of the rotor core, and the rotating shaft penetrates the base body and the boss; The minimum distance between the boss and the first end face of the rotor iron core in the axial direction of the rotor iron core is L1, and L1>0.5 mm.

In some embodiments, the minimum gap between the boss and the permanent magnet in the radial direction of the rotor core is L2, and L2>0.5 mm.

In some embodiments, the minimum gap between the base body and the permanent magnet in the axial direction of the rotor core is L3, and L3>0.5 mm.

In some embodiments, the rotor assembly further includes an external connection damping member, the rotor core has an axial through hole located between adjacent magnet slots, and the external connection damping member is provided on the shaft Into the through hole, the first end of the external connection damping member is connected to the first end damping member, and the second end of the external connection damping member is connected to the second end damping member .

In some embodiments, the rotor assembly further includes an inner connection damping member, the inner connection damping member is provided in the gap between the rotating shaft and the rotor iron core, and the inner connection damping member The first end of the inner connecting damper is connected to the first end damper, and the second end of the inner connection damper is connected to the second end damper.

In some embodiments, the rotor assembly further includes an intermediate connection damping member, a gap is formed between the inner surface of the permanent magnet and the inner bottom surface of the magnet slot, and the intermediate connection damping member is provided on the In the gap, the first end of the intermediate connection damping member is connected to the first end vibration damping member, and the second end of the intermediate connection vibration damping member is connected to the second end vibration damping member.

In some embodiments, the rotor core is formed by stacking a plurality of rotor punches along the axial direction of the rotor core, the rotor punches include a full bridge punch and a half bridge punch, the The rotor core has a first end portion, a second end portion, and an intermediate section between the first end portion and the second end portion, the first end portion and the second end portion being formed by a plurality of the fully connected The bridge punching pieces are stacked, and the middle section is formed by stacking a plurality of the half-connecting bridge punching pieces.

In some embodiments, among the half-bridge punching pieces in the intermediate section that are adjacent in the axial direction of the rotor iron core, one half-connecting bridge punching piece is relative to the other half-connecting bridge punching piece along the rotor iron. The circumferential rotation of the core is one pole.

In some embodiments, a part of the inner magnetic bridges of the plurality of inner magnetic bridges of the half-bridge punching piece is provided with a magnetic bridge hole penetrating the inner magnetic bridge along the circumferential direction of the rotor iron core, and in the rotor iron core In the inner magnetic bridges of the adjacent half-connected bridge punches in the axial direction of the core, the magnetic bridge hole is provided in the inner magnetic bridge of one half-connected bridge punch, and the inner magnetic bridge of the other half-connected bridge punch is not provided. The magnetic bridge hole is provided with a circumferential connection damping member, and adjacent intermediate connection damping members are connected to each other through the circumferential connection damping member.

In some embodiments, the first end damper, the second end damper, the inner connection damper, the outer connection damper, the intermediate connection damper, and The circumferential connection damping member is integrally formed by injection molding of viscoelastic material.

In some embodiments, the outer peripheral wall of the transmission member is provided with a transmission radial protrusion and a transmission radial opening groove located between adjacent transmission radial protrusions, and the end vibration damping member has a central hole, The peripheral wall of the central hole is provided with a vibration-damping radial protrusion and a radial vibration-damping opening slot located between adjacent vibration-damping radial protrusions, and the transmission radial protrusion is matched with the vibration-damping radial protrusion. In the open groove, the vibration damping radial protrusion is fitted in the transmission radial open groove.

A motor according to an embodiment of the second aspect of the present invention includes the rotor assembly described in any of the above embodiments.

According to the motor according to the embodiment of the present invention, in the rotor assembly, the first end surface of the rotor core is provided with a first end vibration damping member that cooperates with the rotating shaft through the transmission member, so as to avoid the rigid connection between the rotating shaft and the rotor core, and the transmission member improves the rotation speed of the rotating shaft. The rotating effect of the vibration damping part is large, the noise reduction and vibration damping effect is good, and the reliability is high.

Description of drawings

FIG. 1 is an exploded perspective view of a rotor assembly according to one embodiment of the present invention.

FIG. 2 is a schematic view of the assembled state of the rotor assembly shown in FIG. 1 .

FIG. 3 is an axial cross-sectional view of the rotor assembly shown in FIG. 2 .

FIG. 4 is an enlarged schematic view of part A in FIG. 3 .

FIG. 5 is a cross-sectional view of the damped rotor shown in FIG. 2 .

6 is a schematic diagram of a rotor core of a rotor assembly according to an embodiment of the present invention.

FIG. 7 is a schematic perspective view of a transmission member of a rotor assembly according to an embodiment of the present invention.

8 is a plan view of a transmission member of a rotor assembly according to an embodiment of the present invention.

9 is a schematic diagram of a half-bridge punch of a rotor assembly according to an embodiment of the present invention.

10 is a schematic diagram of a fully connected bridge punch of a rotor assembly according to an embodiment of the present invention.

FIG. 11 is another axial cross-sectional view of the rotor assembly shown in FIG. 1 .

FIG. 12 is a side view of the rotor assembly shown in FIG. 1 .

FIG. 13 is another perspective schematic view of the transmission member of the rotor assembly according to the embodiment of the present invention.

14 is a comparison diagram of the damping ratio of a rotor assembly according to an embodiment of the present invention and the prior art.

Reference number:

rotor assembly 100,

The rotor core 10, the shaft hole 101, the magnet slot 102, the axial through hole 103, the magnetic bridge hole 104, the gap 105,

Full bridge punch 110, half bridge punch 120, punch body 111, outer magnetic bridge 112, inner magnetic bridge 113, magnetic pole 114, protrusion 115,

permanent magnet 20,

Vibration damping member 60, first end damping member 61, plate portion 610, boss portion 611, opening 612, first damping radially inner opening groove 615, first damping radially inner protrusion 616, first The central hole 617, the second end vibration damping member 62, the external connection damping member 63, the middle connection damping member 64, the inner vibration damping member 65, the circumferentially connected vibration damping member 66,

The transmission member 51 , the transmission radial protrusion 510 , the transmission radial opening groove 511 , the base body 513 , and the boss 514 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

As shown in FIGS. 1-10 , the rotor assembly 100 according to the embodiment of the present invention includes a rotor core 10 , a permanent magnet 20 , a rotating shaft 30 , a vibration damping member 60 and a transmission member 51 .

The rotor core 10 has a magnet slot 102 and a shaft hole 101 . As shown in FIGS. 1 and 6 , 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 (left-right direction in FIGS. 1 and 6 ). A plurality of magnet slots 102 are provided, and the plurality of magnet slots 102 are evenly spaced around the rotating shaft hole 101 along the circumferential direction of the rotor core 10 .

The permanent magnets 20 are provided in the magnet slots 102 . As shown in FIGS. 1 and 6 , there are multiple permanent magnets 20 , and one permanent magnet 20 is installed in each magnet slot 102 , so that the multiple permanent magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10 .

The rotating shaft 30 is arranged in the rotating shaft hole 101, and there is a gap between the rotating shaft 30 and the rotor core 10. In other words, as shown in FIG. 3, the diameter D1 of the inner circular hole of the rotor core 10 is larger than the diameter D2 of the rotating shaft, that is, D1> D2. The first end of the rotating shaft 30 (the left end of the rotating shaft 30 in FIGS. 1-3 ) and the second end (the right end of the rotating shaft 30 in FIGS. 1-3 ) protrude from the rotating shaft hole 101 . As shown in FIG. 1 to FIG. 3 , the axial direction of the rotating shaft 30 is substantially the same as the axial direction of the rotor iron core 10 , and is inserted through the rotating shaft hole 101 on the rotor iron core 10 .

The damping member 60 includes a first end damping member 61, and the first end damping member 61 is provided on the first end face of the rotor iron core 10 (the left end face of the rotor iron core 10 in FIGS. The rotor cores 10 are connected.

The transmission member 51 is arranged in the first end vibration damping member 61 , and the transmission member 51 cooperates with the rotating shaft 31 . In other words, since there is a gap between the inner peripheral wall of the rotating shaft hole 101 of the rotor iron core 10 and the rotating shaft 30 , the rotor iron core 10 does not directly drive the rotating shaft 30 , but drives the rotating shaft 30 at least through the first end vibration damping member 61 and the transmission member 51 . rotate.

The damping member 60 further includes a second end damping member 62 , and the second end damping member 62 is provided on the second end face of the rotor iron core 10 (the right end face of the rotor iron core 10 in FIG. 1 to FIG. 3 ) and Connected to the rotor core 10 . As shown in FIG. 1 and FIG. 3 , the second end vibration damping member 62 is directly matched with the rotating shaft 30 , and the rotor core 10 passes through the second end vibration damping member 62 and sequentially passes through the first end vibration damping member 61 and the transmission member. 51 drive shaft.

According to the rotor assembly of the embodiment of the present invention, by arranging the first end vibration damping member on the first end face of the rotor iron core, which is matched with the rotating shaft through the transmission member, the rigid connection between the rotating shaft and the rotor iron core is avoided, and the transmission member improves the stability of the rotating shaft. Rotation effect, and the material of the vibration damping parts is large, and the noise reduction and vibration damping effect is good; there is no problem of different thermal expansion coefficients, which improves the reliability of the rotor assembly, and only needs to set the vibration damping parts in the production process, and the preparation process is related. Simple, reducing the defect rate of mass production.

In some embodiments, the materials of the first end damping member 61 and the second end damping member 62 are both viscoelastic materials, such as rubber, thermoplastic materials, and the like. In the present application, the viscoelastic material can greatly absorb the energy generated by the resonance, so as to achieve the vibration reduction effect.

As shown in Figure 14, by designing the end face of the rotor iron core as a fully viscoelastic material, the damping ratio of the rotor can be greatly improved, compared with ordinary rotors (rigid connection), injection molded parts (end plates) and vibration damping rings. For the end structure, the damping ratio of the end structure using the fully viscoelastic material is larger.

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

Further, the Shore hardness of the viscoelastic material is 20 to 80 degrees, thereby improving the manufacturability of the motor. For example, Shore hardness is 30 degrees, 40 degrees, and 50 degrees.

In some embodiments, a part of the first end vibration damping member 61 is directly matched with the rotating shaft 30 , and the rotor iron core 10 passes through a part of the first end vibration damping member 61 and sequentially passes through the first end vibration damping member 61 and the transmission The member 51 drives the shaft 30 .

As shown in FIGS. 1 , 3 and 4 , the transmission member 51 is located on the left side of a part of the first end damping member 61 , and the left end of the rotating shaft 30 penetrates the rotor iron core 10 , a part of the first end damping member 61 and The transmission member 51 is extended, and the transmission member 51 and a part of the first end vibration damping member 61 are directly matched with the rotating shaft 30. Therefore, when the rotor iron core 10 rotates, the first end vibration damping member 61 is driven to rotate, thereby further The rotating shaft 30 is driven to rotate by a part of the first end vibration damping member 61 and the transmission member 51 . The thickness of a part of the first end damping member 61 in the axial direction of the rotating shaft 30 is L, where L≧0.5 mm, thus, while increasing the material amount of the damping member, the vibration damping member and the rotor iron core are connected. connection is more reliable.

In some embodiments, the transmission member 51 includes a base body 513 and a boss 514 , the boss 514 protrudes from the base body 513 toward the first end surface of the rotor core 10 , and the rotating shaft 30 penetrates through the base body 513 and the boss 514 .

As shown in FIGS. 1 , 13 and 11 , the boss 514 faces the left end face of the rotor core 10 , the base body 513 is matched with the first center hole 617 of the first end vibration damping member 61 , and the boss 514 is located at the first end damping member 61 . The vibrating element 61 is internally matched. Both the base body 513 and the boss 514 are provided with through holes, and the rotating shaft 30 passes through the base body 513 and the boss 514 through the corresponding through holes.

When the length of the permanent magnet protrudes from the end face of the rotor iron core, the protrusion can be embedded in the center ring formed by the circumferential arrangement of the permanent magnet along the axial direction of the rotor iron core, which can improve the ability of the transmission part to transmit torque and the fatigue reliability of the vibration damping part. It can reduce the axial length of the rotor assembly, which is beneficial to the miniaturized design of the motor.

In some embodiments, the minimum distance between the boss 514 and the first end face of the rotor core 10 in the axial direction of the rotor core 10 is L1, and L1>0.5 mm. Thereby, while increasing the material amount of the damping member, the connection between the damping member and the rotor core is made more reliable. Moreover, it is not only beneficial to improve the vibration damping performance of the rotor, but also facilitates the fluidity when the damping material is injected into the injection molding, and improves the manufacturability of the injection molding process.

In some embodiments, as shown in FIG. 12 , the minimum gap between the boss 514 and the permanent magnet 20 in the radial direction of the rotor core 10 is L2, and L2>0.5 mm. Thereby, while increasing the material amount of the damping member, the connection between the damping member and the rotor core is made more reliable. Moreover, it is not only beneficial to improve the vibration damping performance of the rotor, but also facilitates the fluidity when the damping material is injected into the injection molding, and improves the manufacturability of the injection molding process.

In some embodiments, as shown in FIG. 11 , the minimum gap between the base body 513 and the permanent magnet 20 in the axial direction of the rotor core 10 is L3, and L3>0.5 mm. Thereby, while increasing the material amount of the damping member, the connection between the damping member and the rotor core is made more reliable. Moreover, it is not only beneficial to improve the vibration damping performance of the rotor, but also facilitates the fluidity when the damping material is injected into the injection molding, and improves the manufacturability of the injection molding process.

It can be understood that the transmission member 51 of the present application is not limited to that shown in FIG. 13 . For example, in other embodiments, as shown in FIG. 7 , the transmission member 51 has no boss.

In some embodiments, as shown in FIGS. 1 and 3 , the damping member 60 further includes an externally connected damping member 63 , the rotor core 10 has axial through holes 103 located between adjacent magnet slots 102 , and the external connection is The damping member 63 is arranged in the axial through hole 103 , the first end of the externally connected damping member 63 (the left end of the externally connected damping member 63 in FIG. 1 ) is connected to the first end damping member 61 , and the externally connected damping member 61 The second end of the damping member 63 (the right end of the externally connected damping member 63 in FIG. 1 ) is connected to the second end damping member 62 .

As shown in FIG. 1 , there are a plurality of external connection damping members 63 , and the plurality of external connection damping members 63 are arranged at intervals along the circumferential direction of the rotor core 10 , thereby further increasing the amount of material of the damping members and improving the reduction of vibration reduction. Noise capability and damping effect are improved, and the connection between the first end damping member and the second end damping member and the rotor iron core is more reliable.

In some embodiments, as shown in FIG. 1 and FIG. 3 , the damping member 60 further includes an inner connecting damping member 65 , and the inner connecting damping member 65 is provided in the gap between the rotating shaft 30 and the rotor core 10 , and the inner connecting damping member 65 is The first end of the connection damping member 65 (the left end of the internal connection damping member 65 in FIG. 4 ) is connected to the first end damping member 61 , and the second end of the internal connection damping member 65 (in FIG. The right end of the vibration member 65 ) is connected to the second end vibration damping member 62 .

As shown in FIG. 1 and FIG. 3 , the inner connection damping member 65 is connected between the first end vibration damping member 61 and the second end vibration damping member 62 , and a plurality of outer connection vibration damping members 63 surround the inner connection damping member 63 . Outside the vibrating element 65 . The inner connecting damping member 65 surrounds the rotating shaft 30 and is directly matched with the rotating shaft 30 . Thereby, the material quantity of the damping element is further increased, the noise reduction capability and the damping effect are improved, and the inner connecting damping element is directly matched with the rotating shaft, which further improves the transmission reliability of the damping element.

In some embodiments, as shown in FIG. 1 , the damping member 60 further includes an intermediate connection damping member 64 , a gap 105 is formed between the inner surface of the permanent magnet 20 and the inner bottom surface of the magnet slot 102 , and the intermediate connection damping member 64 Set in the gap 105 , the first end of the intermediate connection damping member 64 (the left end of the intermediate connection damping member 64 in FIG. 1 ) is connected to the first end vibration damping member 61 , and the second end of the intermediate connection damping member 64 is connected. (The right end of the middle connection damping member 64 in FIG. 1 ) is connected to the second end damping member 62 .

As shown in FIG. 1 , there are a plurality of intermediate connection dampers 64 , the plurality of intermediate connection dampers 64 are arranged at intervals along the circumferential direction of the rotor core 10 , and the intermediate connection dampers 64 are provided between the outer connection dampers 63 and the outer connection dampers 63 . Internally connected between the damping members 65 . Thereby, while increasing the material amount of the damping member, the connection between the damping member and the rotor core is made more reliable.

In some embodiments, the rotor core 10 is formed by stacking a plurality of rotor blanks along the axial direction of the rotor core 10 . The rotor blanks 10 include full bridge blanks 110 and half bridge blanks 120 . The iron core 10 has a first end portion, a second end portion and a middle section located between the first end portion and the second end portion, the first end portion and the second end portion are stacked by a plurality of full bridge punching pieces 110 The middle section is formed by stacking a plurality of half bridge punching pieces 120 .

As shown in FIGS. 6 , 9 and 10 , the rotor punch includes a punch body portion 111 , an outer magnetic bridge 112 , an inner magnetic bridge 113 and magnetic poles 114 , and a plurality of magnetic poles 114 are arranged at intervals along the circumference of the rotor core 10 , at least partially The magnetic pole 114 is connected to the punching body portion 111 through the inner magnetic bridge 113 . Among the plurality of rotor blanks forming the rotor core 10, there are both full bridge blanks 110 and half bridge blanks 120. The full bridge blanks 110 are located at both ends of the rotor core 10, and the half bridge blanks The sheet 120 is located in the middle of the rotor core 10 .

As shown in FIG. 9 , among the plurality of magnetic poles 114 of the half-bridge punch 120 , some of the magnetic poles 114 are connected to the punch body 111 through the inner magnetic bridge 113 , and the other part of the magnetic poles 114 and the punch body 111 are connected to the rotor core 10 . are spaced apart in the radial direction of the rotor core 10 , wherein a 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 . The outer magnetic bridges 112 of the half-connected bridge punches 120 are disconnected between adjacent magnetic poles 114 .

As shown in FIG. 10 , among the multiple magnetic poles 114 of the full-bridge punch 110 , each magnetic pole 114 is connected to the punch body 111 through an inner magnetic bridge 113 , and the outer magnetic bridge 112 of the half-bridge punch 110 is closed.

In this embodiment, by arranging the full bridge punching piece at the end of the rotor iron core, it is not only beneficial to the mold sealing material in the injection molding process, but also prevents the injection liquid from leaking out and causes the molded product to have burrs and flash edges. It can improve the rigidity and strength of the rotor core.

In some embodiments, among the adjacent half bridge punches 110 in the middle section, one half bridge punch 110 rotates one magnetic pole 114 relative to the other half bridge punch 110 along the circumferential direction of the rotor core 10 . As a result, the inner magnetic bridge of the rotor iron core forms an alternately connected and disconnected structure in the axial direction, which can improve the electromagnetic performance of the motor, thereby reducing energy consumption.

A part of the inner magnetic bridges 113 of the half-bridge punching piece 120 is provided with a magnetic bridge hole 104 penetrating the inner magnetic bridge 113 in the circumferential direction of the rotor iron core 10 . Among the inner magnetic bridges 113 of the adjacent half-bridge punching pieces 120 , a magnetic bridge hole 104 is provided in the inner magnetic bridge 113 of one half-connecting bridge punching piece 120 , and the inner magnetic bridge 113 of the other half-connecting bridge punching piece 120 does not have a magnetic bridge hole 104 . The magnetic bridge hole 104 is provided with a circumferential connection damping member 66 in the magnetic bridge hole 104 , and adjacent intermediate connection damping members 64 are connected to each other through the circumferential connection damping member 66 .

As shown in FIG. 6 , the inner magnetic bridge 113 of one half-bridge punch 120 is provided with a magnetic bridge hole 104 , and the inner magnetic bridge 113 of the other half-bridge punch 120 has no magnetic bridge hole 104 , and the magnetic bridge hole 104 is provided in the inner magnetic bridge 113 of the other half-bridge punch 120 . The half bridge punches 120 and the half bridge punches 120 without the magnetic bridge holes 104 are alternately arranged. The circumferentially connected dampers 66 are arranged in a plurality of rows spaced apart in the axial direction of the rotor core 10, each row including a plurality of circumferentially spaced apart from the rotor core 10, wherein each A plurality of circumferentially connecting damping members 66 in a row connect adjacent intermediate connecting damping members 64 .

In some embodiments, the first end damper 61 , the second end damper 62 , the inner connection damper 65 , the outer connection damper 63 , the intermediate connection damper 64 and the circumferential connection damper Piece 66 is integrally injection molded from a viscoelastic material. In the present application, by filling viscoelastic material inside the rotor iron core, the ends and the magnetic bridge holes of the rotor iron core, the damping characteristics of the rotor iron core can be improved, and the noise reduction and vibration reduction performance can be further improved.

In addition, the viscoelastic materials (the first end damping member 61 and the second end damping member 62 ) on both sides of the rotor core end face are connected, and in the actual manufacturing process, the end fillings on both sides can be integrally formed with a mold Damping material to improve the manufacturability of the motor. Moreover, the connection between the vibration damping element and the rotor iron core is tight and reliable, and it is not easy to be separated, which improves the stability.

In some specific embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15, and the Shore hardness of the viscoelastic material is 20 degrees to 80 degrees, so that the electromagnetic force wave can be effectively absorbed and attenuated when the motor rotor is running. And improve the manufacturability of the motor. For example, Shore hardness is 30 degrees, 40 degrees, and 50 degrees.

In some embodiments, as shown in FIGS. 1 , 2 , 7 and 8 , the outer peripheral wall of the transmission member 51 is provided with a transmission radial protrusion 510 and a transmission radial opening located between adjacent transmission radial protrusions 510 Slot 511. The first end vibration damping member 61 has a first central hole 617 , and a first vibration damping radial protrusion 616 is provided on the inner peripheral wall of the first central hole 617 and is located between adjacent first vibration damping radial protrusions 616 The first radial vibration-damping opening groove 615 , the transmission radial protrusion 510 is matched in the first vibration-damping radial opening groove 615 , and the first vibration-damping radial protrusion 616 is matched in the transmission radial opening groove 511 .

As shown in Figures 1, 2, 7 and 8, the outer peripheral wall of the transmission member 51 is provided with a plurality of transmission radial protrusions 510 and a plurality of transmission radial opening grooves 511, and the conical angle of the transmission radial opening groove 511 is α≥5°, and tapers radially outward. The plurality of transmission radial protrusions 510 are arranged at intervals along the circumference of the rotor core 10 , and a first transmission radial opening slot 511 is formed between every two adjacent transmission radial protrusions 510 .

A plurality of first vibration-damping radial protrusions 616 and a plurality of first radial vibration-damping inward opening grooves 615 are provided on the peripheral wall of the first central hole 617 of the first end vibration-damping member 61 . The vibration-damping radial protrusions 616 are arranged at intervals along the circumference of the rotor core 10 , and a first radial vibration-damping inward opening slot 615 is formed between every two adjacent first vibration-damping radial protrusions 616 .

The transmission member 51 is arranged in the first end vibration damping member 61, the transmission radial projection 510 is fitted in the first radial vibration damping inward opening groove 615, and the first vibration damping radial projection 616 is fitted in the transmission radial projection 616. into the opening groove 511.

In some embodiments, the length of the permanent magnets 20 in the axial direction of the rotor core 10 is greater than the axial length of the magnet slots 102 , and the first ends of the permanent magnets 20 protrude from the magnet slots 102 and fit at the first ends. In the vibration damping member 61 , the second end of the permanent magnet 20 protrudes from the magnet slot 102 and fits in the second end vibration damping member 62 . The rotor assembly of this embodiment not only improves the electromagnetic performance of the motor and reduces the energy consumption, but also enables the vibration damping member of the rotor assembly to bear greater torque.

In some embodiments, each of the first end damper 61 and the second end damper 62 is provided with an opening 612 for exposing a portion of the rotor core 10 .

As shown in FIG. 1 , both the first end vibration damping member 61 and the second end vibration damping member 62 include a plate portion 610 and a boss portion 611 , an opening 612 is provided on the outer peripheral surface of the plate portion 610 , and the opening 612 may be multiple A plurality of openings 612 are arranged at intervals along the circumferential direction of the plate portion 610, so that the left end portion of the rotor core is exposed, so as to solve the problem of insufficient structural rigidity of the rotor assembly during the overall magnetization, and ensure that the rotor assembly is magnetized as a whole. There will be no obvious deformation or loosening during the process, so that the overall magnetization of the rotor assembly can be realized and the magnetization efficiency can be improved.

A plurality of openings 612 are provided on the first end damping member 61 , a plurality of openings 612 are provided on the second end damping member 62 , and the first end damping member 61 and the second end damping member The projections formed by the opening 612 provided on the 62 on the end face of the rotor core 10 overlap, and the positioning member installed through the opening 612 can withstand the rotor core 10, so that the rotor core 10 is fixed on the first end vibration damping member 61. and the second end damping member 62 .

Since the projections of the openings 612 provided on the first end damping member 61 and the second end damping member 62 on the end surface of the rotor core 10 overlap, the first end surface of the rotor core 10 and the first end surface of the rotor core 10 are The force points of the two end faces are the same, and the force is more uniform.

The position of the opening 612 is not limited to the outer peripheral surface of the end vibration damping member. For example, in other embodiments, the opening 612 may be provided on the plate portions 610 of the first end vibration damping member 61 and the second end vibration damping member 62 . Or on the boss portion 611 , as long as a part of the rotor core 10 can be exposed, it is sufficient for the positioning member to bear against the rotor core 10 .

Some specific exemplary rotor assemblies in accordance with the present invention are described below with reference to FIGS. 1-10.

As shown in FIGS. 1-3 , the rotor assembly 100 according to the embodiment of the present invention includes a rotor core 10 , a plurality of permanent magnets 20 , a rotating shaft 30 , a transmission member 51 and a vibration damping member 60 .

The rotor core 10 has a rotating shaft hole 101 , a plurality of magnet slots 102 , a plurality of axial through holes 103 and a plurality of magnetic bridge holes 104 . The rotating shaft hole 101 is provided at a substantially central position of the rotor iron core 10 and penetrates the rotor iron core 10 along the axial direction of the rotor iron core 10 . A plurality of magnet slots 102 are evenly spaced 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 punching pieces along the axial direction of the rotor core 10 , wherein among the plurality of rotor punching pieces located at the left end part and the right end part are the full bridge punching pieces 110 , and the middle part is the full bridge punching piece 110 . Punching piece 120 for the semi-connected bridge.

The rotor punch includes a punch body portion 111 , an outer magnetic bridge 112 , an inner magnetic bridge 113 and a magnetic pole 114 . Among the plurality of magnetic poles 114 of the full bridge punch 120, each magnetic pole 114 is connected to the punch body portion 111 through an inner magnetic bridge 113, and a plurality of spaced protrusions 115 are arranged on the outer periphery of the punch body portion 111, adjacent inner magnetic bridges 113. A protrusion 115 is provided between the magnetic bridges 113 , and the outer magnetic bridge 112 of the half-connecting bridge punching piece 110 is closed.

The outer magnetic bridges 112 of the half-connected bridge punches 120 are disconnected between adjacent magnetic poles 114 . Among the plurality of magnetic poles 114 of the half-bridge punch 120, a part of the magnetic poles 114 is connected with the punch body part 111 through the inner magnetic bridge 113, and the other part of the magnetic poles 114 and the punch body part 111 are spaced apart in the radial direction of the rotor core 10, One 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 . Among the adjacent half bridge punching pieces 110 in the middle part, one half connecting bridge punching piece 110 rotates one magnetic pole 114 relative to the other half connecting bridge punching piece 110 in the circumferential direction of the rotor core 10 . As a result, the inner magnetic bridge of the rotor iron core forms an alternately connected and disconnected structure in the axial direction, which can improve the electromagnetic performance of the motor, thereby reducing energy consumption.

A part of the inner magnetic bridges 113 of the half-bridge punching piece 120 is provided with a magnetic bridge hole 104 penetrating the inner magnetic bridge 113 in the circumferential direction of the rotor iron core 10 . Among the inner magnetic bridges 113 of the adjacent half-bridge punching pieces 120 , a magnetic bridge hole 104 is provided in the inner magnetic bridge 113 of one half-connecting bridge punching piece 120 , and the inner magnetic bridge 113 of the other half-connecting bridge punching piece 120 does not have a magnetic bridge hole 104 . Magnetic bridge hole 104 .

The plurality of permanent magnets 20 are correspondingly disposed in the plurality of magnet slots 102 , so that the plurality of permanent magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10 . There is a gap 105 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 iron core 10 and is inserted through the rotating shaft hole 101 on the rotor iron core 10 , and there is a gap between the rotating shaft 30 and the rotor iron core 10 .

The damping member 6 includes a first end damping member 61 , a second end damping member 62 , an outer connecting damping member 63 , an intermediate connecting damping member 64 , an inner connecting damping member 65 and a circumferentially connecting damping member 66.

The first end damping member 61 is connected to the left end face of the rotor core 10 , the second end damping member 62 is connected to the right end face of the rotor core 10 , and the rotating shaft 30 passes through the first end in sequence from left to right. Part of the inner circumference of the first end vibration damper 61 is directly matched with the outer circumference of the rotating shaft 30, and the second end vibration damper 62 The inner circumference is directly matched with the outer circumference of the rotating shaft 30 .

The first end vibration damper 61 and the second end vibration damper 62 each include a plate portion 610 and a boss portion 611 . The outer peripheral surface of the plate portion 610 is provided with openings 612 , and there are a plurality of openings 612 , and the plurality of openings 612 are arranged at intervals along the circumferential direction of the plate portion 610 . The boss portion 611 of the first end damper 61 protrudes leftward from the left end face of the first end damper 61 , and the boss portion 621 of the second end damper 62 protrudes from the second end damper 62 . The right end of 62 protrudes to the right.

A plurality of first vibration-damping radial protrusions 616 and a plurality of first radial vibration-damping inward opening grooves 615 are provided on the peripheral wall of the first central hole 617 of the first end vibration-damping member 61 . The vibration-damping radial protrusions 616 are arranged at intervals along the circumference of the rotor core 10 , and a first radial vibration-damping inward opening slot 615 is formed between every two adjacent first vibration-damping radial protrusions 616 .

The inner connection damping member 65 is arranged in the gap between the rotating shaft 30 and the rotor core 10, and the left end of the inner connection damping member 65 is connected to the first end vibration damping member 61, and the right end of the inner connection damping member 65 is connected to the first end vibration damping member 61. The second end damper 62 is connected.

The external connection damping member 63 is arranged in the axial through hole 103, and the left end of the external connection damping member 63 is connected to the first end vibration damping member 61, and the right end of the external connection damping member 63 is connected to the second end vibration damping member 63. piece 62 is connected. Therefore, there are a plurality of outer connection damping members 63 , and the plurality of outer connection damping members 63 are arranged at intervals along the circumferential direction of the rotor core 10 and surround the outer side of the inner connection damping member 65 .

The intermediate connection damping member 64 is arranged in the gap 105 , the left end of the intermediate connection damping member 64 is connected to the first end vibration damping member 61 , and the right end of the intermediate connection damping member 64 is connected to the second end vibration damping member 62 . Therefore, there are a plurality of intermediate connection damping members 64 , the plurality of intermediate connection damping members 64 are arranged at intervals along the circumferential direction of the rotor core 10 , and the intermediate connection damping members 64 are provided on the outer connection damping member 63 and the inner connection damping member 64 . between 65 pieces.

The circumferentially connected dampers 66 are arranged in a plurality of rows spaced apart in the axial direction of the rotor core 10, each row including a plurality of circumferentially spaced apart from the rotor core 10, wherein each A plurality of circumferentially connecting damping members 66 in a row connect adjacent intermediate connecting damping members 64 .

The first end vibration damper 61 , the second end vibration damper 62 , the intermediate connection vibration damper 64 , the outer connection vibration damper 63 , the inner connection vibration damper 65 and the circumferential connection vibration damper 66 are integrally formed by injection molding, And the material is rubber or thermoplastic elastomer. Therefore, the vibration damping member has low hardness and rigidity, has a good vibration damping effect, and is tightly and reliably connected with the rotor iron core, which is not easy to be detached, and improves the stability.

The outer peripheral wall of the transmission member 51 is provided with a plurality of transmission radial protrusions 510 and a plurality of transmission radial opening grooves 511. A transmission radial opening groove 511 is formed between the transmission radial protrusions 510 . The transmission member 51 is arranged in the first end vibration damping member 61, the transmission radial projection 510 is fitted in the first radial vibration damping inward opening groove 615, and the first vibration damping radial projection 616 is fitted in the transmission radial projection 616. into the opening groove 511.

The first boss 514 faces the left end surface of the rotor core 10 , the first base 513 is matched with the first center hole 617 of the first end vibration damper 61 , and the first boss 514 is located inside the first end vibration damper 61 Cooperate. The first base body 513 and the first boss 514 are both provided with first through holes, and the rotating shaft 30 passes through the first base body 513 and the first boss 514 through the corresponding first through holes.

The minimum distance between the boss 514 and the first end face of the rotor core 10 in the axial direction of the rotor core 10 is L1, and L1>0.5 mm. The minimum gap between the boss 514 and the permanent magnet 20 in the radial direction of the rotor core 10 is L2, and L2>0.5 mm; the minimum gap between the base 513 and the permanent magnet 20 in the axial direction of the rotor core 10 is L3, and L3 >0.5 mm.

The rotating shaft 30 sequentially penetrates the transmission member 51 , a part of the first end vibration damping member 61 , the rotor iron core 10 , and the second end vibration damping member 62 in the direction from left to right, and the transmission member 51 , the first end vibration damping member 62 A part of the vibration member 61 , the rotor iron core 10 , and the second end vibration damping member 62 are all directly matched with the rotating shaft 30 . Therefore, when the rotor iron core 10 rotates, the first end vibration reduction member 61 and the second end vibration reduction member 61 are driven. The vibration damping member 62 rotates, and then the rotating shaft 30 is driven to rotate through the joint action of a part of the first end vibration damping member 61 , the first transmission member 51 and the second end vibration damping member 62 .

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

Make rotor core, permanent magnet, rotating shaft and transmission parts respectively;

Insert the rotor core onto the shaft through the shaft hole;

Put the assembled rotor iron core, the rotating shaft and the transmission part together into the mold for positioning, and insert the plurality of permanent magnets into the plurality of magnet slots of the rotor iron core respectively;

The rotor iron core, permanent magnet, rotating shaft and transmission parts are formed into an integral overmolding structure with rubber or thermoplastic elastomer material through injection molding process, and the structure after molding of the rubber or thermoplastic elastomer material is the vibration damping part.

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

According to the motor according to the embodiment of the present invention, by improving the structure of the rotor assembly, a damping member and a transmission member can be provided at at least the end of the rotor iron core, and at least part of the damping member can be directly matched with the rotating shaft. The other parts of the motor can be matched with the rotating shaft through the transmission parts, which avoids the rigid connection between the rotating shaft and the rotor iron core, and at the same time increases the material amount of the vibration damping parts and improves the noise reduction and vibration reduction effect of the whole motor.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated devices or elements. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean a specific feature, structure, material, or description described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (17)

1. A 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 gap is formed between the rotating shaft and the rotor core, and a first end and a second end of the rotating shaft extend out of the rotating shaft hole;

the first end part vibration damping piece is arranged on the first end surface of the rotor core and is connected with the rotor core;

the transmission piece is arranged in the first end part vibration damping piece and matched with the rotating shaft;

second end damping spare, second end damping spare is established on rotor core's the second terminal surface and with rotor core links to each other, second end damping spare with the pivot directly cooperates, rotor core passes through second end damping spare and loop through first end damping spare with the driving medium drive the pivot.

2. The rotor assembly of claim 1 wherein a portion of the first end damper is directly engaged with the rotating shaft, the rotor core driving the rotating shaft through the portion of the first end damper and, in turn, through the first end damper and the transmission member.

3. The rotor assembly of claim 1 wherein the first end vibration dampener and the second end vibration dampener are each a viscoelastic material.

4. The rotor assembly of claim 3 wherein the loss factor of the viscoelastic material is 0.15 or greater.

5. The rotor assembly of claim 3, wherein the viscoelastic material has a shore hardness of 20-80 degrees.

6. The rotor assembly of claim 1 wherein the transmission comprises a base and a boss projecting from the base toward the first end face of the rotor core, the shaft extending through the base and the boss; the minimum distance between the boss and the first end face of the rotor core in the axial direction of the rotor core is L1, and L1 is larger than 0.5 mm.

7. The rotor assembly of claim 6 wherein the minimum clearance of the boss from the permanent magnet in the radial direction of the rotor core is L2, and L2 > 0.5 mm.

8. The rotor assembly of claim 6 wherein the minimum clearance of the base and the permanent magnets in the axial direction of the rotor core is L3, and L3 > 0.5 mm.

9. The rotor assembly of claim 1 further comprising an outer link damper, the rotor core having an axial through bore between adjacent magnet slots, the outer link damper being disposed within the axial through bore, a first end of the outer link damper being connected to the first end damper, and a second end of the outer link damper being connected to the second end damper.

10. The rotor assembly of claim 9, further comprising an inner connection damper disposed in a gap between the rotating shaft and the rotor core, wherein a first end of the inner connection damper is connected to the first end damper and a second end of the inner connection damper is connected to the second end damper.

11. The rotor assembly of claim 10 further comprising an intermediate link damper, wherein a gap is provided between the inner surface of the permanent magnet and the inner bottom surface of the magnet slot, wherein the intermediate link damper is disposed within the gap, wherein a first end of the intermediate link damper is coupled to the first end damper, and wherein a second end of the intermediate link damper is coupled to the second end damper.

12. The rotor assembly of claim 11, wherein the rotor core is formed by stacking a plurality of rotor laminations in an axial direction of the rotor core, the rotor laminations include full bridge laminations and half bridge laminations, the rotor core has a first end portion, a second end portion and a middle section between the first end portion and the second end portion, the first end portion and the second end portion are formed by stacking a plurality of full bridge laminations, and the middle section is formed by stacking a plurality of half bridge laminations.

13. The rotor assembly of claim 12, wherein one of the axially adjacent half-bridge laminations in the intermediate section rotates one pole relative to the other half-bridge lamination in a circumferential direction of the rotor core.

14. The rotor assembly of claim 12, wherein a portion of the inner magnetic bridges of the plurality of inner magnetic bridges of the half-bridge stamped steel are provided with magnetic bridge holes penetrating through the inner magnetic bridges along the circumferential direction of the rotor core, the inner magnetic bridges of the axially adjacent half-bridge stamped steel of the rotor core are provided with the magnetic bridge holes in the inner magnetic bridge of one half-bridge stamped steel, the inner magnetic bridges of the other half-bridge stamped steel are not provided with the magnetic bridge holes, circumferential connection damping pieces are arranged in the magnetic bridge holes, and the adjacent intermediate connection damping pieces are connected with each other through the circumferential connection damping pieces.

15. The rotor assembly of claim 14 wherein the first end snubber member, the second end snubber member, the inner connection snubber member, the outer connection snubber member, the intermediate connection snubber member, and the circumferential connection snubber member are integrally injection molded from a viscoelastic material.

16. The rotor assembly of claim 1 wherein the peripheral wall of the drive member has drive radial projections and drive radial open slots between adjacent drive radial projections, the end damping member has a central bore, the peripheral wall of the central bore has damping radial projections and radial damping open slots between adjacent damping radial projections, the drive radial projections fit within the damping radial open slots, and the damping radial projections fit within the drive radial open slots.

17. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 16.

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