CN215419782U - Rotor punching sheet, rotor assembly and motor - Google Patents
Rotor punching sheet, rotor assembly and motor Download PDFInfo
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- CN215419782U CN215419782U CN202022694620.3U CN202022694620U CN215419782U CN 215419782 U CN215419782 U CN 215419782U CN 202022694620 U CN202022694620 U CN 202022694620U CN 215419782 U CN215419782 U CN 215419782U
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Abstract
The utility model discloses a rotor punching sheet, a rotor assembly and a motor, wherein the rotor punching sheet comprises a plurality of fan-shaped parts, the fan-shaped parts are arranged at intervals along the circumferential direction, the inner ends of the adjacent fan-shaped parts are not connected with each other, the rotor punching sheet is provided with a plurality of mounting grooves, the mounting grooves are formed between the two adjacent fan-shaped parts, the mounting grooves comprise a first mounting groove and a second mounting groove, the size of the first mounting groove in the radial direction of the fan-shaped parts is larger than that of the second mounting groove in the radial direction of the fan-shaped parts, the size of the first mounting groove in the circumferential direction is smaller than that of the second mounting groove in the circumferential direction, the first mounting groove and the second mounting groove are alternately arranged in the circumferential direction, and the rotor punching sheet is also provided with a groove which is oppositely arranged with the second mounting groove in the radial direction of the fan-shaped parts. The rotor punching sheet provided by the embodiment of the utility model can improve the noise reduction and vibration reduction effects of the motor.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a rotor punching sheet, a rotor assembly with the rotor punching sheet and a motor with the rotor assembly.
Background
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. However, the noise reduction and vibration reduction effects in the related art are relatively poor.
SUMMERY OF THE UTILITY MODEL
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
in the related art, the built-in brushless direct current motor is widely applied due to the advantages of simple structure, high reliability, high efficiency density and the like. However, the inventor of the present invention has found that, since the built-in brushless dc motor adopts a spoke rotor structure, the spoke rotor structure limits the internal space of the rotor, the gap between the rotor core and the rotor core of the rotating shaft and the rotating shaft is limited, the amount of damping material is limited, the damping effect is poor, and the noise caused by the voltage or tangential force of the motor shaft is large, and the noise reduction effect is poor.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the first aspect of the utility model provides a rotor punching sheet, which can increase the amount of damping material in a motor and improve the noise reduction and damping effects of the motor.
Embodiments of a second aspect of the utility model propose a rotor assembly.
Embodiments of a third aspect of the present invention propose an electric machine.
The rotor punching sheet according to the embodiment of the first aspect of the utility model comprises a plurality of sectors which are arranged at intervals along the circumferential direction, the inner ends of the adjacent sectors are not connected with each other, the rotor punching sheet is provided with a plurality of mounting grooves, the mounting grooves are formed between two adjacent sectors, the mounting grooves comprise a first mounting groove and a second mounting groove, the size of the first mounting groove in the radial direction of the sector is larger than the size of the second mounting groove in the radial direction of the sector, and the dimension of the first mounting groove in the circumferential direction is smaller than the dimension of the second mounting groove in the circumferential direction, the first mounting grooves and the second mounting grooves are alternately arranged in the circumferential direction, the rotor punching sheet is further provided with grooves, and the grooves and the second mounting grooves are oppositely arranged in the radial direction of the sector.
According to the rotor punching sheet provided by the embodiment of the utility model, the first mounting grooves and the second mounting grooves are alternately arranged, the size of the second mounting grooves in the circumferential direction of the sector is larger than that of the first mounting grooves in the circumferential direction of the sector, and the size of the second mounting grooves in the radial direction of the sector is smaller than that of the first mounting grooves in the radial direction of the sector, so that a larger spacing space can be formed between the second mounting grooves and the rotor core, and more damping materials can be filled in the grooves arranged in the spacing space, so that the noise reduction and damping effects of the motor are improved.
In some embodiments, a dimension of the groove in the circumferential direction is smaller than a dimension of the second mounting groove in the circumferential direction.
In some embodiments, a dimension of the groove in a radial direction of the sector is smaller than a dimension of the second mounting groove in the radial direction of the sector.
In some embodiments, the sector portion includes two side surfaces arranged opposite to each other in the circumferential direction, the first mounting grooves and the second mounting grooves are alternately arranged one by one in the circumferential direction, one of the two side surfaces of the sector portion is provided with a first protrusion, the other of the two side surfaces of the sector portion is provided with a second protrusion, and a distance between the first protrusion and an outer end surface of the sector portion in a radial direction of the sector portion is greater than a distance between the second protrusion and the outer end surface of the sector portion in the radial direction of the sector portion.
In some embodiments, both side surfaces of the sector are provided with limit parts for stopping the permanent magnet, and the limit part is positioned at the outer end of the sector part to form two adjacent sector parts of the first mounting groove, the first projection on one sector and the first projection on the other sector are arranged opposite in the circumferential direction, the first mounting groove is positioned between the first bulges of the two adjacent fan-shaped parts and the limiting part in the radial direction of the fan-shaped parts to form two adjacent fan-shaped parts of the second mounting groove, the second projection on one sector and the second projection on the other sector are arranged opposite in the circumferential direction, the second mounting groove is positioned between the second protrusions of the two adjacent sectors and the limiting part in the radial direction of the sectors, the second mounting groove and the groove are spaced apart by the second protrusions of the adjacent two sectors.
In some embodiments, the first projection on one sector and the first projection on the other sector are arranged at an interval in the circumferential direction in two adjacent sectors forming the first mounting groove, and the second projection on one sector and the second projection on the other sector are arranged at an interval in the circumferential direction in two adjacent sectors forming the second mounting groove, the second mounting groove and the groove being communicated through a gap between the second projections of the two adjacent sectors.
A rotor assembly according to an embodiment of the second aspect of the present invention includes: the inner iron core is provided with a rotating shaft hole, and the outer peripheral surface of the inner iron core is provided with a plurality of bosses which are arranged at intervals along the circumferential direction of the inner iron core; the rotating shaft penetrates through the inner iron core through the rotating shaft hole; the outer iron core is arranged around the inner iron core, a gap is formed between the outer iron core and the inner iron core, the outer iron core is provided with a plurality of first grooves, a plurality of second grooves and a plurality of matching grooves, the bosses are matched in the matching grooves, the bosses correspond to the matching grooves one by one, the outer iron core is formed by overlapping a plurality of rotor punching sheets along the axial direction of the inner iron core, the rotor punching sheets are the rotor punching sheets in the embodiment, the first grooves are formed by first mounting grooves of the rotor punching sheets oppositely arranged in the axial direction of the inner iron core, the second grooves are formed by second mounting grooves of the rotor punching sheets oppositely arranged in the axial direction of the inner iron core, and the matching grooves are formed by grooves of the rotor punching sheets oppositely arranged in the axial direction of the inner iron core; a plurality of first permanent magnets mounted in the first slot; a plurality of second permanent magnets installed in the second slots, a size of the second permanent magnets in a radial direction of the inner core being smaller than a size of the first permanent magnets in the radial direction of the inner core, and a size of the second permanent magnets in a circumferential direction of the inner core being larger than a size of the first permanent magnets in the circumferential direction of the inner core; the first vibration reduction piece is arranged in a gap between the inner iron core and the rotor punching sheet to coat the inner iron core, and the boss is embedded in the first vibration reduction piece.
According to the rotor assembly provided by the embodiment of the utility model, by adopting the rotor punching sheet, a matching groove extending along the axial direction of the inner core can be formed between the second groove and the outer peripheral surface of the inner core, and a vibration damping material can be filled in the matching groove, so that the vibration damping and noise reduction effects of the motor are improved.
In some embodiments, the boss is spaced apart from an inner wall surface of the fitting groove in both a radial direction of the inner core and a circumferential direction of the inner core.
In some embodiments, the rotor assembly further includes a second vibration damper provided at an end of the inner core and an end of the outer core, the second vibration damper includes an annular base connected to the end of the outer core and the first vibration damper, and a plurality of extensions provided at an outer periphery of the annular base, the plurality of extensions being arranged at intervals in a circumferential direction of the annular base, a part of the plurality of extensions being in contact with the first permanent magnet, and another part of the plurality of extensions being in contact with the second permanent magnet.
In some embodiments, the outer side of the one partial extension is coplanar with the outer side of the first permanent magnet, and the outer side of the other partial extension is coplanar with the outer side of the second permanent magnet.
In some embodiments, the first and second damping members are integrally injection molded.
In some embodiments, the first and second damping members are made of a fiberglass reinforced resin material or a thermoplastic elastomer material.
In some embodiments, the remanence of the second permanent magnet is equal to or greater than the remanence of the first permanent magnet.
In some embodiments, the cross-sectional area of the second permanent magnet is greater than the cross-sectional area of the first permanent magnet by more than 10%.
The motor according to the embodiment of the third aspect of the present invention includes the rotor assembly of the above embodiment, and by using the above rotor assembly, the motor operates with low noise and small vibration.
Drawings
Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the utility model.
Fig. 2 is a schematic structural view of a rotor assembly according to an embodiment of the present invention.
Fig. 3 is a partial structural view of a rotor assembly according to an embodiment of the present invention.
Fig. 4 is a sectional view of a rotor assembly according to an embodiment of the present invention.
Reference numerals:
a rotor assembly 1;
an inner core 10; a boss 101;
an outer core 20; a rotor sheet 201; a sector 2011; a stopper 2012; a first projection 2013; a second protrusion 2014; a first mounting groove 2015; a second mounting groove 2016; a groove 2017; a central bore 2018; a mating groove 202;
a rotating shaft 30;
a first permanent magnet 40;
a second permanent magnet 50;
the first damper 60; a second damping member 70; an annular base 701; an extension 702.
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 utility model and are not to be construed as limiting the utility model.
As shown in fig. 1 to 4, a rotor sheet 201 according to an embodiment of the present invention includes a plurality of sectors 2011, the plurality of sectors 2011 are arranged at intervals in a circumferential direction of the rotor sheet 201, and inner ends of adjacent sectors 2011 are not connected to each other. That is, the plurality of sectors 2011 are separate pieces that are not in contact with each other.
The rotor sheet 201 has a plurality of mounting grooves, and as shown in fig. 1, one mounting groove is formed between two adjacent sectors 2011. It can be understood that the space between the two sectors 2011 is a mounting groove, the mounting grooves include a first mounting groove 2015 and a second mounting groove 2016, the first mounting groove 2015 and the second mounting groove 2016 are alternately arranged in the circumferential direction of the rotor sheet 201, and the radial dimension of the first mounting groove 2015 in the sectors 2011 is greater than the radial dimension of the second mounting groove 2016 in the sectors 2011. As shown in fig. 1, the radial direction of the sector 2011 is the longitudinal direction of the first mounting groove 2015 or the second mounting groove 2016, and the length of the first mounting groove 2015 is greater than the length of the second mounting groove 2016.
The size of the first mounting groove 2015 in the circumferential direction of the sector 2011 is smaller than the size of the second mounting groove 2016 in the circumferential direction of the sector 2011. As shown in fig. 1, the circumferential direction of the sector 2011 is the width direction of the first mounting groove 2015 or the second mounting groove 2016, and the width of the second mounting groove 2016 is greater than the width of the first mounting groove 2015.
Specifically, as shown in fig. 1, the rotor sheet 201 has a center hole 2018, the distance between the center hole 2018 at the outer end of the first mounting groove 2015 and the center hole 2018 at the outer end of the second mounting groove 2016 is equal to the distance between the outer end of the second mounting groove 2016 and the center hole 2018, the distance between the inner end of the first mounting groove 2015 and the center hole 2018 is smaller than the distance between the inner end of the second mounting groove 2016 and the center hole 2018, that is, the spacing distance between the inner end of the second mounting groove 2016 and the center hole 2018 is larger.
The recess 2017 is disposed opposite to the second mounting groove 2016 in the radial direction of the sector 2011. As shown in fig. 1, the plurality of grooves 2017 correspond to the plurality of second mounting grooves 2016 one-to-one, and the grooves 2017 are located in the spacing space between the corresponding second mounting groove 2016 and the central hole 2018. It will be appreciated that the recesses 2017 may be filled with damping material, and that the greater the distance separating the second mounting groove 2016 from the central opening 2018, the more damping material can be accommodated by the recesses 2017 disposed within that space.
According to the rotor punching sheet provided by the embodiment of the utility model, the first mounting grooves and the second mounting grooves are alternately arranged, the size of the second mounting grooves in the circumferential direction of the sector is larger than that of the first mounting grooves in the circumferential direction of the sector, and the size of the second mounting grooves in the radial direction of the sector is smaller than that of the first mounting grooves in the radial direction of the sector, so that a larger spacing space can be formed between the second mounting grooves and the rotor core, and more damping materials can be filled in the grooves arranged in the spacing space, so that the noise reduction and damping effects of the motor are improved.
In some embodiments, as shown in fig. 1, the size of the groove 2017 in the circumferential direction is smaller than the size of the second mounting groove 2016 in the circumferential direction. From this, the setting of recess can not interfere the overall arrangement of first mounting groove and second mounting groove, and the structural strength of the rotor punching of considering, and the reasonable groove size that sets up can avoid the structural strength reduction of rotor punching.
Further, the size of the groove 2017 in the radial direction of the sector 2011 is smaller than the size of the second mounting groove 2016 in the radial direction of the sector 2011. Therefore, the second mounting groove has enough accommodating space for accommodating the permanent magnet, and the magnetic load of the rotor assembly is improved.
In some embodiments, as shown in fig. 1, the sector 2011 includes two side surfaces which are arranged opposite to each other in the circumferential direction, two side surfaces of the sector 2011 are both provided with a limiting portion 2012 for stopping the permanent magnet, the limiting portion 2012 is located at an outer end of the sector, the first mounting grooves 2015 and the second mounting grooves 2016 are arranged alternately one by one in the circumferential direction, one side surface of the two side surfaces of the sector 2011 is provided with a first protrusion 2013, and the other side surface of the two side surfaces of the sector 2011 is provided with a second protrusion 2014.
As shown in fig. 1, an outer end of one sector 2011 has two limiting portions 2012, one of the limiting portions 2012 and the first protrusion 2013 are located on one side surface of the sector 2011, the limiting portions 2012 and the first protrusion 2013 are spaced in a radial direction of the sector 2011, the other of the limiting portions 2012 and the second protrusion 2014 are located on the other side surface of the sector 2011, and the limiting portions 2012 and the second protrusion 2014 are spaced in the radial direction of the sector 2011.
The distance between first projection 2013 and the outer end surface of sector 2011 in the radial direction of sector 2011 is greater than the distance between second projection 2014 and the outer end surface of sector 2011 in the radial direction of sector 2011. In other words, the first projection 2013 is closer to the central hole 2018.
Further, as shown in fig. 1, of the two adjacent sectors 2011 forming the first mounting groove 2015, the first protrusion 2013 on one sector 2011 and the first protrusion 2013 on the other sector 2011 are arranged opposite to each other in the circumferential direction, and the first mounting groove 2015 is located between the first protrusion 2013 and the stopper 2012 of the two adjacent sectors 2011 in the radial direction of the sectors 2011.
Further, as shown in fig. 1, in two adjacent sectors 2011 forming the first mounting groove 2015, the stopper 2012 on one side surface of one sector 2011 is circumferentially arranged opposite to the stopper 2012 on one side surface of the other sector 2011. It is understood that the two opposite stoppers 2012 and the two opposite first protrusions 2013 may constitute a first mounting groove 2015, and the two opposite stoppers 2012 and the two opposite first protrusions 2013 may limit the movement of the permanent magnet located in the first mounting groove 2015.
In two adjacent sectors 2011 forming a second mounting groove 2016, the second protrusion 2014 on one sector 2011 and the second protrusion 2014 on the other sector 2011 are arranged opposite to each other in the circumferential direction, and the second mounting groove 2016 is located between the second protrusion 2014 and the stopper 2012 of the two adjacent sectors 2011 in the radial direction of the sectors 2011.
Further, as shown in fig. 1, in two adjacent sectors 2011 forming the second mounting groove 2016, the stopper 2012 on the other side surface of one sector 2011 and the stopper 2012 on the other side surface of the other sector 2011 are opposite in the circumferential direction of the sector 2011, and the two opposite stopper 2012 and the two opposite first protrusions 2013 can restrict movement of the permanent magnet located in the second mounting groove 2016.
Further, the second mounting groove 2016 and the groove 2017 are spaced apart by the second projection 2014 of the adjacent two sectors 2011, and the first mounting groove 2015 and the groove 2017 are communicated through a gap between the two second projections 2014.
Further, the first projection 2013 is located at the tip of the inner end of the sector 2011, and the second projection 2014 is located outside the first projection 2013 in the radial direction of the sector 2011 as shown in fig. 1. Thus, the distance between the first protrusion 2013 and the stopper 2012 in the radial direction of the sector 2011 is greater than the distance between the second protrusion 2014 and the stopper 2012 in the radial direction of the sector 2011, that is, the dimension of the first mounting groove 2015 in the radial direction of the sector 2011 is greater than the dimension of the second mounting groove 2016 in the radial direction of the sector 2011.
In some embodiments, as shown in fig. 1, the stops 2012 of adjacent sectors 2011 are circumferentially opposed and spaced apart. It can be understood that a plurality of rotor sheets 201 can be stacked to form the rotor assembly 1, a space between the limiting portions 2012 of the adjacent sector portions 2011 can be regarded as a sub-hole, after the plurality of rotor sheets 201 are stacked, the plurality of sub-holes can form a through hole to reduce magnetic leakage of the rotor assembly, and in the stacking process, edges of the plurality of sub-holes need to be aligned, so that the assembling and positioning effects can be achieved.
The rotor assembly 1 according to an embodiment of the present invention includes an inner core 10, a rotation shaft 30, an outer core 20, a first permanent magnet 40, a second permanent magnet 50, and a first damper 60.
The inner core 10 has a rotation shaft hole, the outer circumferential surface of the inner core 10 has a plurality of bosses 101 arranged at intervals in the circumferential direction of the inner core 10, and the rotation shaft 30 penetrates the inner core 10 through the rotation shaft hole. As shown in fig. 2, the inner core 10 extends along the axial direction of the rotor assembly 1, and the rotating shaft 30 is fitted in the rotating shaft hole along the axial direction of the rotor, and the rotating shaft 30 can drive the rotor assembly 1 to rotate.
The outer core 20 is disposed around the inner core 10 with a gap therebetween, and the outer core 20 has a plurality of first slots, a plurality of second slots, and a plurality of fitting slots 202. The bosses 101 are fitted in the fitting grooves 202, and the plurality of bosses 101 correspond to the plurality of fitting grooves 202 one to one. The outer core 20 is formed by stacking a plurality of rotor punching sheets 201 in the axial direction of the inner core 10.
The rotor sheet is the rotor sheet 201 according to the embodiment of the present invention, the first groove is formed by a first mounting groove 2015 of the plurality of rotor sheets 201 arranged in the axial direction of the inner core 10, the second groove is formed by a second mounting groove 2016 of the plurality of rotor sheets 201 arranged in the axial direction of the inner core 10, and the mating groove 202 is formed by a groove 2017 of the plurality of rotor sheets 201 arranged in the axial direction of the inner core 10.
As shown in fig. 3, a plurality of rotor sheets 201 are sleeved on the periphery of an inner core 10, and the plurality of rotor sheets 201 are stacked to form an outer core 20, in the stacking process, first mounting grooves 2015 of the plurality of rotor sheets 201 are opposite and communicated with each other in the axial direction of the inner core 10 to form a first groove, second mounting grooves 2016 of the plurality of rotor sheets 201 are opposite and communicated with each other in the axial direction of the inner core 10 to form a second groove, grooves 2017 of the plurality of rotor sheets 201 are opposite and communicated with each other in the axial direction of the inner core 10 to form a matching groove 202, a plurality of bosses 101 protrude from the outer peripheral surface of the inner core 10 toward the matching groove 202, and the outer ends of the bosses 101 are matched with each other in the corresponding matching grooves 202.
As shown in fig. 3 and 4, the first permanent magnets 40 are installed in the first slots, and the plurality of first permanent magnets 40 and the plurality of first slots correspond one-to-one. The second permanent magnets 50 are installed in the second slots, and the plurality of second permanent magnets 50 and the plurality of second slots correspond one to one. The size of the second permanent magnet 50 in the radial direction of the inner core 10 is smaller than the size of the first permanent magnet 40 in the radial direction of the inner core 10, and the size of the second permanent magnet 50 in the circumferential direction of the inner core 10 is larger than the size of the first permanent magnet 40 in the circumferential direction of the inner core 10.
The first vibration damper 60 is arranged in a gap between the inner core 10 and the rotor sheet 201 to cover the inner core 10, and the boss 101 is embedded in the first vibration damper 60.
As shown in fig. 4, the first damper 60 is sleeved on the outer periphery of the inner core 10, and a portion of the first damper 60 opposite to the fitting groove 202 protrudes outward and fits in the fitting groove 202, and the boss 101 is embedded in a portion of the first damper 60 that fits in the fitting groove 202.
According to the rotor assembly provided by the embodiment of the utility model, by adopting the rotor punching sheet, a matching groove extending along the axial direction of the inner core can be formed between the second groove and the outer peripheral surface of the inner core, and a vibration damping material can be filled in the matching groove, so that the vibration damping and noise reduction effects of the rotor assembly are improved.
In some embodiments, as shown in fig. 3, the boss 101 is spaced from the inner wall surface of the fitting groove 202 both in the radial direction of the core 10 and in the circumferential direction of the inner core 10.
In other words, the bosses 101 are fitted in the corresponding fitting grooves 202, and there is a gap between the outer wall surfaces of the bosses 101 and the inner wall surfaces of the fitting grooves 202, and the gap can be filled with the first vibration dampers 60, so that the amount of vibration damping material in the rotor assembly 1 is increased, and better vibration damping and noise reduction effects are achieved. And the first vibration dampers 60, the bosses 101 and the fitting grooves 202 may form a close fitting relationship, increasing the overall stability of the rotor assembly 1.
Further, as shown in fig. 2, the rotor assembly 1 further includes a second vibration damper 70, and the second vibration damper 70 is provided at the end portions of the inner core 10 and the outer core 20. Therefore, the second vibration reduction piece does not occupy the space between the inner iron core and the outer iron core, and the volume of the rotor assembly in the radial direction is not increased while the vibration reduction material of the rotor assembly is increased.
Specifically, the second damper 70 includes an annular base 701 and a plurality of extensions 702 extending in a radial direction of the outer core 20, the annular base 701 is in contact with an end of the outer core 20 and the first damper 60, the extensions 702 are provided on an outer periphery of the annular base 701, and the plurality of extensions 702 are arranged at intervals in a circumferential direction of the annular base 701, and a part of the extensions 702 among the plurality of extensions 702 is in contact with the first permanent magnet 40 to restrict movement of the first permanent magnet 40 in an axial direction of the outer core 20.
Another part of the plurality of extensions 702 is in contact with the second permanent magnet 50 to restrict the movement of the second permanent magnet 50 in the axial direction of the outer core 20. In addition, when the injection molding process is adopted for machining, the contact between the extension portion 702 and the first permanent magnet 40 can be understood as fixed connection, the contact between the extension portion 702 and the second permanent magnet 50 can also be understood as fixed connection, and the second vibration damping member 70 is connected with the end of the inner iron core 10, so that the outer iron core 20, the inner iron core 10, the first permanent magnet 40 and the second permanent magnet 50 can be connected to form the integrated rotor assembly 1.
As shown in fig. 1, the front and rear end surfaces of the outer core 20 are provided with a second damping member 70, and the annular base body 701 of the second damping member 70 coupled to the front end surface of the outer core 20 is coupled to the first damping member 60 and the front end of the inner core 10. A plurality of extensions 702 annularly provided on the outer periphery of the annular base 701 are connected to the front end surfaces of the first and second permanent magnets 40 and 50, the annular base 701 of the second damper 70 connected to the rear end surface of the outer core 20 is connected to the first damper 60 and the rear end surface of the inner core 10, and a plurality of extensions 702 annularly provided on the outer periphery of the annular base 701 are connected to the rear end surfaces of the first and second permanent magnets 40 and 50.
Further, as shown in fig. 2, the outer side surface of one part of the extension 702 is coplanar with the outer side surface of the first permanent magnet 40, and the outer side surface of the other part of the extension 702 is coplanar with the outer side surface of the second permanent magnet 50. Therefore, the peripheral surface of the rotor assembly is smooth and the operation is stable.
In some embodiments, the first vibration damper 60 and the second vibration damper 70 are integrally formed by injection molding, so that the first vibration damper and the second vibration damper are convenient to process and stable in structure, and the first vibration damper and the second vibration damper are tightly matched with the inner iron core and the outer iron core, and gaps are not easily generated, so that the reliability of the rotor assembly can be improved.
Further, the first and second damping members 60 and 70 are made of a glass fiber reinforced resin material or a thermoplastic elastomer material. Therefore, the first vibration damping piece and the second vibration damping piece can greatly reduce the voltage difference caused by the permanent magnetic field at two ends of the shaft, and the electric corrosion probability of the bearing is reduced.
In some embodiments, the remanence of the second permanent magnet 50 is equal to or greater than the remanence of the first permanent magnet 40, and the cross-sectional area of the second permanent magnet 50 is greater than the cross-sectional area of the first permanent magnet 40 by more than 10%, so that the magnetic load of the motor can be increased, the asymmetry of the magnetic circuit can be reduced, and the odd-numbered frequency multiplication radial force caused by the magnetic field asymmetry can be reduced.
According to the motor provided by the embodiment of the utility model, the rotor assembly 1 provided by the embodiment of the utility model is adopted, so that the motor has low operation noise and small vibration.
A rotor assembly according to one specific example of the present invention is described below with reference to fig. 1 to 4.
As shown in fig. 1 to 4, a rotor assembly 1 according to an embodiment of the present invention includes an inner core 10, an outer core 20, a rotation shaft 30, a first permanent magnet 40, a second permanent magnet 50, a first damper 60, and a second damper 70. Outer iron core 20 cover is established on inner iron core 10, and inner iron core 10 has the pivot hole, and pivot 30 wears to establish in the pivot hole, is equipped with a plurality of first grooves and the second groove of arranging along its circumference in turn on outer iron core 20, and first permanent magnet 40 cooperates at first inslot, and second permanent magnet 50 cooperates at the second inslot.
The inner iron core 10 and the outer iron core 20 are spaced apart in the radial direction of the rotating shaft 30, the first vibration damping member 60 is filled between the inner iron core 10 and the outer iron core 20, the second vibration damping member 70 is coated at the front end and the rear end of the outer iron core 20, the second vibration damping member 70 comprises an annular base body 701 and a plurality of extension portions 702, the annular base body 701 is connected with the first vibration damping member 60 and the inner iron core 10, the portions of the extension portions 702 are correspondingly connected with the plurality of first permanent magnets 40, and the other portions of the extension portions 702 are correspondingly connected with the plurality of second permanent magnets 50.
A first protrusion 2013 and a limiting portion 2012 are arranged on the side, facing the other sector 2011, of one sector 2011 of adjacent sectors 2011 forming a first installation groove 2015, a first protrusion 2013 and a limiting portion 2012 are arranged on the side, facing the other sector 2011, of the other sector 2011, the two first protrusions 2013 are opposite and spaced in the circumferential direction of the sector 2011, the two limiting portions 2012 are opposite and spaced in the circumferential direction of the sector 2011, and the two opposite first protrusions 2013 and the two opposite limiting portions 2012 define a first installation groove 2015.
A second protrusion 2014 and a limiting part 2012 are arranged on the side, facing the other sector 2011, of one sector 2011 of adjacent sectors 2011 forming the second mounting groove 2016, a second protrusion 2014 and a limiting part 2012 are arranged on the side, facing the one sector 2011, of the other sector 2011, the two second protrusions 2014 are opposite and spaced in the circumferential direction of the sector 2011, the two limiting parts 2012 are opposite and spaced in the circumferential direction of the sector 2011, the two opposite second protrusions 2014 and the two opposite limiting parts 2012 form the second mounting groove 2016, the radial dimension of the first mounting groove 2015 in the radial direction of the sector 2011 is larger than the radial dimension of the second mounting groove 2016 in the radial direction of the sector 2011, the circumferential dimension of the first mounting groove 2015 in the circumferential direction of the sector 2011 is smaller than the circumferential dimension of the second mounting groove 2016 in the circumferential direction of the sector 2011, and the plurality of first mounting grooves 2015 are communicated to form the first groove, the second grooves 2016 are connected to form a second groove.
The inner side of the second mounting groove 2016 is provided with a groove 2017, the grooves 2017 are spaced along the circumferential direction of the sector 2011, the grooves 2017 and the second mounting grooves 2016 are opposite in the radial direction of the sector 2011, the two opposite second protrusions 2014 space the corresponding second mounting groove 2016 from the groove 2017, the second mounting groove 2016 and the corresponding groove 2017 are communicated through a gap between the two second protrusions 2014, the grooves 2017 are communicated to form a matching groove 202, the outer periphery of the inner iron core 10 is provided with a plurality of outward-protruding bosses 101, the bosses 101 are arranged at intervals along the outer periphery of the inner iron core 10, the bosses 101 are correspondingly matched in the matching grooves 202, the outer walls of the bosses 101 are spaced from the inner walls of the matching grooves 202, and the first vibration damper 60 is embedded in the space.
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 utility model 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 utility model.
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 implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such 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 being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, 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 (15)
1. A rotor punching sheet is characterized by comprising a plurality of fan-shaped parts, wherein the fan-shaped parts are arranged at intervals along the circumferential direction, the inner ends of the adjacent fan-shaped parts are not connected with each other, the rotor punching sheet is provided with a plurality of installation grooves, the installation grooves are formed between the adjacent two fan-shaped parts, the installation grooves comprise a first installation groove and a second installation groove, the size of the first installation groove in the radial direction of the fan-shaped parts is larger than that of the second installation groove in the radial direction of the fan-shaped parts, the size of the first installation groove in the circumferential direction is smaller than that of the second installation groove in the circumferential direction, and the first installation groove and the second installation groove are alternately arranged in the circumferential direction,
the rotor punching sheet is also provided with a groove, and the groove and the second mounting groove are oppositely arranged in the radial direction of the sector part.
2. The rotor sheet according to claim 1, wherein the size of the groove in the circumferential direction is smaller than the size of the second mounting groove in the circumferential direction.
3. The rotor sheet as recited in claim 2, wherein the size of the groove in the radial direction of the sector is smaller than the size of the second mounting groove in the radial direction of the sector.
4. The rotor sheet according to any one of claims 1 to 3, wherein the segment includes two side faces arranged oppositely in the circumferential direction,
the first mounting grooves and the second mounting grooves are alternately arranged one by one in the circumferential direction, a first protrusion is arranged on one of two side faces of the fan-shaped portion, a second protrusion is arranged on the other of the two side faces of the fan-shaped portion, and the radial distance between the first protrusion and the outer end face of the fan-shaped portion is larger than the radial distance between the second protrusion and the outer end face of the fan-shaped portion.
5. The rotor sheet according to claim 4, wherein two side surfaces of the sectors are respectively provided with a limiting portion for stopping the permanent magnet, the limiting portions are located at the outer ends of the sectors, two adjacent sectors forming the first mounting grooves are formed, a first bulge on one sector and a first bulge on the other sector are oppositely arranged in the circumferential direction, the first mounting groove is located between the first bulges of the two adjacent sectors and the limiting portions in the radial direction of the sectors,
and in two adjacent fan sections forming the second mounting groove, a second bulge on one fan section and a second bulge on the other fan section are oppositely arranged in the circumferential direction, the second mounting groove is positioned between the second bulge of the two adjacent fan sections and the limiting part in the radial direction of the fan sections, and the second mounting groove and the groove are spaced by the second bulges of the two adjacent fan sections.
6. The rotor sheet as recited in claim 4, wherein the first protrusions of one sector and the first protrusions of the other sector are arranged at intervals in the circumferential direction in two adjacent sectors forming the first mounting groove,
and in two adjacent fan sections forming the second mounting groove, a second bulge on one fan section and a second bulge on the other fan section are arranged at intervals in the circumferential direction, and the second mounting groove and the groove are communicated through a gap between the second bulges of the two adjacent fan sections.
7. A rotor assembly, comprising:
the inner iron core is provided with a rotating shaft hole, and the outer peripheral surface of the inner iron core is provided with a plurality of bosses which are arranged at intervals along the circumferential direction of the inner iron core;
the rotating shaft penetrates through the inner iron core through the rotating shaft hole;
the outer iron core is arranged around the inner iron core, a gap is formed between the outer iron core and the inner iron core, the outer iron core is provided with a plurality of first grooves, a plurality of second grooves and a plurality of matching grooves, the bosses are matched in the matching grooves, the bosses correspond to the matching grooves one by one, the outer iron core is formed by axially overlapping a plurality of rotor punching sheets along the inner iron core, the rotor punching sheets are the rotor punching sheets according to any one of claims 1-6, the first grooves are formed by first mounting grooves of the rotor punching sheets oppositely arranged in the axial direction of the inner iron core, the second grooves are formed by second mounting grooves of the rotor punching sheets oppositely arranged in the axial direction of the inner iron core, and the matching grooves are formed by grooves of the rotor punching sheets oppositely arranged in the axial direction of the inner iron core;
a plurality of first permanent magnets mounted in the first slot;
a plurality of second permanent magnets installed in the second slots, a size of the second permanent magnets in a radial direction of the inner core being smaller than a size of the first permanent magnets in the radial direction of the inner core, and a size of the second permanent magnets in a circumferential direction of the inner core being larger than a size of the first permanent magnets in the circumferential direction of the inner core;
the first vibration reduction piece is arranged in a gap between the inner iron core and the rotor punching sheet to coat the inner iron core, and the boss is embedded in the first vibration reduction piece.
8. The rotor assembly according to claim 7, wherein the boss is spaced apart from an inner wall surface of the fitting groove both in a radial direction of the inner core and in a circumferential direction of the inner core.
9. The rotor assembly according to claim 7, further comprising a second damper provided at an end portion of the inner core and the outer core, the second damper comprising an annular base connected to the end portion of the outer core and the first damper, and a plurality of extensions provided at an outer periphery of the annular base, the plurality of extensions being arranged at intervals in a circumferential direction of the annular base, wherein a part of the plurality of extensions is in contact with the first permanent magnet, and another part of the plurality of extensions is in contact with the second permanent magnet.
10. The rotor assembly of claim 9 wherein the outer side of the one portion of the extension is coplanar with the outer side of the first permanent magnet and the outer side of the other portion of the extension is coplanar with the outer side of the second permanent magnet.
11. The rotor assembly of claim 9 wherein the first and second vibration dampeners are integrally injection molded.
12. The rotor assembly of claim 11 wherein the first and second damping members are made of a fiberglass reinforced resin material or a thermoplastic elastomer material.
13. The rotor assembly of any one of claims 8-12 wherein the remanence of the second permanent magnet is equal to or greater than the remanence of the first permanent magnet.
14. A rotor assembly as claimed in any one of claims 8 to 12 wherein the cross-sectional area of the second permanent magnet is greater than the cross-sectional area of the first permanent magnet by more than 10%.
15. An electrical machine comprising a rotor assembly as claimed in any one of claims 7 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022694620.3U CN215419782U (en) | 2020-11-18 | 2020-11-18 | Rotor punching sheet, rotor assembly and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022694620.3U CN215419782U (en) | 2020-11-18 | 2020-11-18 | Rotor punching sheet, rotor assembly and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215419782U true CN215419782U (en) | 2022-01-04 |
Family
ID=79636695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022694620.3U Active CN215419782U (en) | 2020-11-18 | 2020-11-18 | Rotor punching sheet, rotor assembly and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215419782U (en) |
-
2020
- 2020-11-18 CN CN202022694620.3U patent/CN215419782U/en active Active
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