CN120810975A - Motor and vehicle - Google Patents

Abstract

The application provides a motor and a vehicle. The motor comprises a stator, wherein the stator comprises a stator core, the stator core comprises a plurality of stator punching sheets, the stator punching sheets are stacked, the stator punching sheets comprise a yoke part and a plurality of tooth parts, the tooth parts are connected to the peripheral wall of the yoke part at intervals along the circumferential direction of the stator, any two adjacent tooth parts and the yoke part enclose a groove part, the groove parts of the stator punching sheets penetrate through in the axial direction of the stator to form stator grooves, the thickness of the stator core is denoted as Lstk, the number of the stator grooves is denoted as Ns, the rotor is arranged around the stator, the rotor comprises a rotor core and a plurality of permanent magnets, the rotor core comprises a plurality of segmented cores, the segmented cores are arranged at intervals along the periphery of the stator, one permanent magnet is arranged between any two adjacent segmented cores, the pole pair number of the rotor is denoted as P, and the outer diameter of the rotor core is denoted as Drout, wherein 15-Lstk/Drout X (Ns, P) is not more than 19. The arrangement can limit the slot level combination of the motor while ensuring the service performance of the motor, that is, can reduce the dosage of the permanent magnet under the condition of ensuring the service performance of the motor to be unchanged (such as torque density and idle tooth space torque), and can achieve the aim of reducing the production cost of the motor.

Description

Motor and vehicle

Technical Field

The application relates to the technical field of motors, in particular to a motor and a vehicle.

Background

In the related art, an electric motor includes a stator and a rotor including permanent magnets. In the related art, the structural arrangement of the motor is unreasonable, and the permanent magnet is more in use amount, so that the production cost of the motor is high.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the application proposes an electric machine.

A second aspect of the application proposes a vehicle.

In view of this, a first aspect of the present application provides an electric motor comprising a stator including a stator core including a plurality of stator laminations stacked, the stator laminations including a yoke portion and a plurality of tooth portions connected to an outer peripheral wall of the yoke portion at intervals in a circumferential direction of the stator, any adjacent two tooth portions and yoke portion enclosing a slot portion, the slot portions of the plurality of stator laminations penetrating in an axial direction of the stator to form stator slots, a thickness of the stator core being denoted Lstk, a number of the stator slots being denoted Ns, a rotor disposed around the stator, the rotor including a rotor core and a plurality of permanent magnets, the rotor core including a plurality of block cores disposed at intervals along an outer periphery of the stator, one permanent magnet being disposed between any adjacent two of the block cores, a pole pair number of the rotor being denoted P, an outer diameter of the rotor core being denoted Drout, wherein 15≤ Lstk/Drout ×lcm (Ns, P). Ltoreq.19.

The application provides a motor which comprises a stator and a rotor. The rotor is arranged around the stator and is rotatably connected to the stator, i.e. the rotor is rotatable relative to the stator. That is, the motor is an external rotor motor.

The stator includes a stator core including a plurality of stator laminations stacked in an axial direction of the stator. Any one of the plurality of stator punching sheets comprises a yoke part and a plurality of tooth parts, any one of the plurality of tooth parts is connected to the outer peripheral wall of the yoke part, and the plurality of tooth parts are arranged at intervals along the circumferential direction of the stator.

The groove part is enclosed by any two adjacent tooth parts and the yoke part. When the plurality of stator laminations are stacked, the slot portions of the plurality of stator laminations are penetrated in the axial direction of the stator to form the stator slots. It is understood that the number of stator slots is plural, and the plural stator slots are arranged at intervals along the circumferential direction of the stator.

The thickness of the stator core is denoted Lstk, the number of stator slots is denoted Ns, and the pole number of the rotor is denoted P. The rotor includes a rotor core, the outer diameter of which is designated Drout. Lstk, ns, P and Drout have a correlation, specifically 15≤ Lstk/Drout X LCM (Ns, P). Ltoreq.19. The arrangement can limit the slot level combination of the motor while ensuring the service performance of the motor, that is, can reduce the dosage of the permanent magnet under the condition of ensuring the service performance of the motor to be unchanged (such as torque density and idle tooth space torque), and can achieve the aim of reducing the production cost of the motor.

It can be understood that by defining the relationship of Lstk, ns, drout and P so as to satisfy 15≤ Lstk/Drout ×LCM (Ns, P). Ltoreq.19, and performing simulation analysis based on the motor satisfying the above parameters, the simulation experiment data of the motor supports the use performance of the motor unchanged (such as torque, no-load cogging torque), and the use amount of the permanent magnet is reduced in practice, that is, the material investment of the permanent magnet is reduced under the condition of ensuring the use performance of the motor, and the production cost of the motor is reduced.

Further, the rotor core includes a plurality of segmented cores, and the rotor further includes a plurality of permanent magnets.

The plurality of segmented iron cores are arranged at intervals along the periphery of the stator, and a permanent magnet is arranged between any two adjacent segmented iron cores. It is understood that the plurality of segmented cores and the plurality of permanent magnets cooperate to form a toroidal structure. The mode that a plurality of segmented iron cores and a plurality of permanent magnets are alternately arranged is adopted, so that the shape of the permanent magnets is not required to be limited to be tile-shaped, the consumption of the segmented iron cores is reduced, and the production cost of the motor can be further reduced. Meanwhile, the size of the segmented iron core is not limited by the pole arc coefficient, and the magnetic focusing effect of the parallel magnetic circuit enables the torque density of the motor to be higher. That is, the power of the motor can be increased under the same conditions, and the torque output of the motor can be ensured.

It is understood that LCM (Ns, P) refers to the least common multiple of Ns and P.

The motor according to the application can also have the following additional technical characteristics:

In some embodiments, optionally, the inner diameter of the stator core is denoted as Dsin, the outer diameter of the stator core is denoted as Dsout, the tooth portion comprises a tooth body and a tooth shoe, the tooth body is connected between the tooth shoe and the outer peripheral wall of the yoke portion, the width of the tooth body in the tangential direction of the stator is denoted as Ws, and the radial depth of the slot opening to the slot bottom of the stator slot is denoted as Hs, wherein 0.2≤dsin×ws/Dsout/hs≤0.24.

In this embodiment, the structure of the stator is further defined, in particular, the stator core comprises a plurality of stacked stator laminations comprising teeth bodies and teeth shoes. The tooth body is connected with the tooth shoe and the tooth body is connected with the outer peripheral wall of the yoke, i.e. the tooth body is connected between the tooth shoe and the outer peripheral wall of the yoke.

Wherein, the inner diameter of the stator core is denoted as Dsin, the outer diameter of the stator core is denoted as Dsout, the width of the tooth body in the tangential direction of the stator is denoted as Ws, and the radial depth from the notch of the stator slot to the slot bottom is denoted as Hs. Dsin, dsout, ws and Hs have relevance, specifically, dsin multiplied by Ws/Dsout/Hs is more than or equal to 0.2 and less than or equal to 0.24. By defining the above parameters to satisfy the above formula, the performance of the motor can be optimized, for example, the working efficiency of the motor can be improved. The winding mode of the coils of the stator can be changed, more turns of coils can be accommodated, the loss of the coils is lower, and the magnetic field strength required by the operation of the motor can be provided. Meanwhile, the circumferential width of the tooth body can be guaranteed through the arrangement, effective and reliable structural support is provided for maintaining the iron loss of the motor in a reasonable range, and the saturation of the tooth part is facilitated to be relieved, so that the output of the motor is facilitated to be improved.

In some embodiments, the inner diameter of the rotor core is optionally designated as Drin, where 0.91-Drin/Drout-0.97.

In this embodiment, the structure of the rotor is further defined.

The inner diameter of the rotor core is denoted as Drin, the outer diameter of the rotor core is denoted as Drout, and the mating structure of the inner diameter of the rotor core Drin and the outer diameter of the rotor core Drout, specifically, 0.91-0.97-0. Drout, is defined.

The arrangement has the effect of ensuring the amount of permanent magnets, and provides effective and reliable structural support for ensuring the service performance of the motor (such as the torque of the motor).

If Drin/Drout is less than 0.91, the amount of the permanent magnet is large, so that the material of the permanent magnet is wasted, and the production cost of the motor is increased.

If Drin/Drout >0.97, the amount of permanent magnets is small, thus reducing the magnetic focusing effect and further reducing the output torque of the motor.

In some embodiments, alternatively, the width of the permanent magnet in the tangential direction of the rotor is denoted as Lmt, and the length of the permanent magnet in the radial direction of the rotor is denoted as Lmr, wherein 0.3+.Lmt/Lmr +.0.7.

In this embodiment, the structure of the permanent magnet is further defined.

Wherein the width of the permanent magnet in the tangential direction of the rotor is denoted as Lmt and the length of the permanent magnet in the radial direction of the rotor is denoted as Lmr. That is, the width of the permanent magnet in the tangential direction of the rotor is denoted as Lmt and the length of the permanent magnet in the radial direction of the rotor is denoted as Lmr.

Lmt and Lmr have a correlation, specifically, 0.3≤Lmt/Lmr≤0.7, so that the size of the air gap between the stator and the rotor can be ensured, and structural support is provided for ensuring the service performance of the motor. Specifically, the reliability of the motor (such as the improvement of the anti-demagnetizing capability of the motor) and the production cost are both considered.

If Lmt/Lmr is less than 0.3, the length of the permanent magnet in the tangential direction of the rotor is too small, which may reduce the reliability of the permanent magnet, for example, demagnetization may be easily generated.

If Lmt/Lmr is greater than 0.7, the length of the permanent magnet in the tangential direction of the rotor is excessively large, and thus, the material of the permanent magnet is wasted, which increases the production cost of the motor.

In some embodiments, optionally, the length of the permanent magnet is greater than the length of the segmented core in the axial direction of the rotor.

In this embodiment, the structure of the rotor is further defined.

The length of the permanent magnet is longer than that of the segmented iron core along the axial direction of the rotor. That is, the length of the permanent magnet in the axial direction of the rotor is longer than the length of the segmented core in the axial direction of the rotor. The end effect of the rotor can be adjusted, and the end effect of the rotor is reduced, so that the output torque of the motor is improved.

This setting is compared and is increased permanent magnet and the length of piecemeal iron core in the axial of rotor simultaneously, can reduce the material input of piecemeal iron core, is favorable to reducing the manufacturing cost of rotor.

In some embodiments, optionally, the rotor further comprises an outer ring, wherein the outer ring is sleeved outside the rotor core and the plurality of permanent magnets, the outer ring is used for fixing the plurality of rotor cores and the plurality of permanent magnets, and the outer ring is a non-magnetic conductive piece.

In this embodiment, the structure of the rotor is further defined such that the rotor also includes an outer ring.

It can be understood that the plurality of block iron cores and the plurality of permanent magnets enclose an annular structure, the outer ring is sleeved on the outer sides of the rotor iron cores and the plurality of permanent magnets, namely, the inner peripheral wall of the outer ring is attached to the rotor iron cores and the plurality of permanent magnets so as to achieve the purpose of fixing the rotor iron cores and the plurality of permanent magnets through the outer ring, and the situation that the rotor iron cores and the plurality of permanent magnets are shifted is avoided.

It is understood that the rotor core includes a plurality of segmented cores, and the shape of the outer peripheral wall of the annular structure surrounded by the plurality of segmented cores and the plurality of permanent magnets is adapted to the shape of the inner peripheral wall of the outer ring. The stability and the reliability of the structure formed by assembling the plurality of segmented iron cores and the plurality of permanent magnets are guaranteed, namely, the matching size of the plurality of segmented iron cores and the plurality of permanent magnets can be guaranteed, so that the balance and the consistency of magnetic fields generated by the segmented iron cores and the permanent magnets can be guaranteed, and structural support is provided for guaranteeing the stable and efficient operation of the motor.

The outer ring is a non-magnetic conductive piece, so that the trend of magnetic force lines can be prevented from being disturbed, namely, the outer ring has the functions of fixing a plurality of partitioned iron cores and a plurality of permanent magnets, and the stable operation of the motor can be ensured.

Optionally, at least one of the segmented core and the permanent magnets is assembled with the outer ring by gluing.

Optionally, at least one of the segmented core and the permanent magnet is assembled with the outer ring by plugging.

In some embodiments, the outer diameter of the outer race is optionally denoted as "trailing", where 0.93+. Drout/trailing+.0.97.

In this embodiment, the structure of the rotor is further defined.

The outer diameter of the outer ring is denoted as drop and the outer diameter of the rotor core is denoted as Drout. Drain and Drout have a correlation, specifically 0.93≤ Drout/Drain≤0.97. The arrangement can ensure the stability and reliability of the assembled rotor core and the permanent magnet, and can also ensure the controllability of the outline dimension of the motor.

If Drout/drop is less than 0.93, the width of the outer ring in the stator-to-rotor direction is excessively large, which increases the size of the motor.

If Drout/casting is greater than 0.97, the width of the outer ring in the direction from the stator to the rotor is too small, so that the force acting on the rotor core and the plurality of permanent magnets by the outer ring is too small, the situation that the plurality of segmented cores of the rotor core are misplaced with the plurality of permanent magnets easily occurs, and the stability and reliability of fixing the rotor core and the plurality of permanent magnets cannot be ensured.

In some embodiments, optionally, the magnetizing direction of the permanent magnet is tangential to the rotor core, and magnetizing directions of two adjacent permanent magnets are opposite.

In this embodiment, the magnetizing directions of the permanent magnets are further defined such that the magnetizing directions of the permanent magnets are tangential to the rotor core, and the magnetizing directions of the adjacent two permanent magnets are opposite.

It is understood that the magnetization direction of the permanent magnet is tangential to the rotor core on the axial end face of the rotor core, and it can be said that the permanent magnet is magnetized in the tangential direction of the rotor core on the axial end face of the rotor core.

The arrangement may be such that the portion of the rotor core between adjacent permanent magnets forms an independent magnetic portion, that is, adjacent two permanent magnets may form a set of magnetic elements. The magnetic part can interact with the coil of the stator after being electrified so as to achieve the purpose of driving the rotor to rotate relative to the stator.

In some embodiments, optionally, the stator and rotor enclose an air gap, the length of the air gap in the direction from the stator to the rotor being denoted as Lag, wherein 0.3 mm. Ltoreq.Lag. Ltoreq.0.5 mm.

In this embodiment, the mating structure of the stator and the rotor is further defined.

The stator and the rotor enclose an air gap, the length of the air gap in the direction from the stator to the rotor is denoted as Lag, and the Lag is limited to be more than or equal to 0.3mm and less than or equal to 0.5mm. The arrangement gives consideration to the processing technology of the motor and the service performance of the motor. And this arrangement is advantageous in reducing torque ripple of the motor.

If Lag is less than 0.3mm, then, the air gap between stator and rotor is too little, like this, can increase the assembly degree of difficulty of motor, can reduce the assembly efficiency of motor, and then can promote the manufacturing cost of motor. Meanwhile, the requirement on the machining precision of the stator and the rotor can be increased, and the machining difficulty of products can be increased.

If Lag is greater than 0.5mm, the gap between the stator and the rotor is too large, which increases the magnetic resistance, and the amount of permanent magnets is required to be increased in order to ensure the performance of the motor, which increases the production cost of the motor.

In some embodiments, optionally, the stator further includes a multi-phase coil, the multi-phase coil is wound on the stator core, the cross-section of the coil is circular or rectangular, and the coil is wound by aluminum wires.

In this embodiment, the structure of the stator is further defined such that the stator further includes a multi-phase coil wound around the stator core.

It will be appreciated that the teeth of the plurality of stator laminations are stacked in the axial direction of the stator to form stator teeth, the number of stator teeth being plural, the plurality of stator teeth being spaced about the axis of the stator, the multiphase coil being wound about the stator teeth.

The coil is sectioned along a length direction perpendicular to the coil, and in the section, a region surrounded by a contour line of the coil forms a section of the coil.

The coil has a circular or rectangular cross-sectional shape, i.e., the coil is a circular coil, or the coil is a flat wire coil.

Wherein the coil is wound from aluminum wire, i.e. the material defining the coil, in particular the coil is wound from aluminum wire.

A second aspect of the application proposes a vehicle comprising an electric machine as in the first aspect.

The vehicle provided by the application, because of comprising the motor as in the first aspect, has all the advantages of the motor described above, and is not stated here.

It is worth to say that the vehicles include electric bicycles, electric motorcycles, electric scooters, electric balance cars, new energy automobiles, and the like. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

Additional aspects and advantages of the application will be set forth in part in the description which follows, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 shows a first partial structural schematic diagram of an electric motor according to an embodiment of the present application;

FIG. 2 shows a second partial schematic of an electric machine according to an embodiment of the application;

fig. 3 shows a schematic structural view of a stator core according to an embodiment of the present application;

FIG. 4 is a graphical representation of the change in no-load back-emf as a function of electrical angle in accordance with the present application;

fig. 5 shows a graphical representation of the torque of the present application as a function of electrical angle.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 3 is:

1 motor, 10 stator, 100 stator core, 110 stator punching, 112 yoke, 114 tooth, 1142 tooth body, 1144 tooth boot, 116 slot, 120 stator slot, 200 coil, 30 rotor, 300 rotor core, 310 block iron core, 400 permanent magnet, 500 outer ring, 60 air gap.

Detailed Description

In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.

Referring now to fig. 1-5, an electric machine 1 and a vehicle according to some embodiments of the application.

As shown in fig. 1, 2 and 3, an electric machine 1 according to some embodiments of the present application includes a stator 10 and a rotor 30.

The stator 10 includes a stator core 100.

The stator core 100 includes a plurality of stator laminations 110.

A plurality of stator laminations 110 are stacked.

The punch includes a yoke 112 and a plurality of teeth 114.

A plurality of teeth 114 are connected to the outer peripheral wall of the yoke 112 at intervals along the circumferential direction of the stator 10.

Any two adjacent teeth 114 and yoke 112 enclose a slot 116.

The slot portions 116 of the plurality of stator laminations 110 penetrate in the axial direction of the stator 10 to form stator slots 120.

The thickness of the stator core 100 is denoted Lstk.

The number of stator slots 120 is denoted Ns.

The rotor 30 is disposed around the stator 10.

The rotor 30 includes a rotor core 300 and a plurality of permanent magnets 400.

Rotor core 300 includes a plurality of segmented cores 310.

A plurality of segmented cores 310 are arranged at intervals along the outer circumference of the stator 10.

A permanent magnet 400 is disposed between any adjacent two of the segmented cores 310.

The pole pair number of the rotor 30 is denoted P.

The outer diameter of rotor core 300 is designated Drout.

Wherein 15 is less than or equal to Lstk/Drout xLCM (Ns, P) is less than or equal to 19.

The application provides an electric machine 1 comprising a stator 10 and a rotor 30. The rotor 30 is arranged around the stator 10, the rotor 30 being in rotational connection with the stator 10, i.e. the rotor 30 is rotatable relative to the stator 10. That is, the motor 1 is an external rotor motor.

The stator 10 includes a stator core 100, and the stator core 100 includes a plurality of stator laminations 110, and the plurality of stator laminations 110 are stacked in the axial direction of the stator 10. Any one of the plurality of stator laminations 110 includes a yoke 112 and a plurality of teeth 114, any one of the plurality of teeth 114 being connected to an outer peripheral wall of the yoke 112, the plurality of teeth 114 being arranged at intervals along the circumferential direction of the stator 10.

Any two adjacent teeth 114 and yoke 112 enclose a slot 116. When the plurality of stator laminations 110 are stacked, the slot portions 116 of the plurality of stator laminations 110 penetrate in the axial direction of the stator 10 to form the stator slots 120. It is understood that the number of the stator slots 120 is plural, and the plural stator slots 120 are arranged at intervals in the circumferential direction of the stator 10.

The thickness of the stator core 100 is denoted Lstk, the number of stator slots 120 is denoted Ns, and the pole number of the rotor 30 is denoted P. The rotor 30 includes a rotor core 300, and an outer diameter of the rotor core 300 is denoted Drout. Lstk, ns, P and Drout have a correlation, specifically 15≤ Lstk/Drout X LCM (Ns, P). Ltoreq.19. This arrangement restricts the slot-level fit of the motor 1 while ensuring the use performance of the motor 1, that is, can reduce the amount of the permanent magnet 400 and can achieve the purpose of reducing the production cost of the motor 1 while ensuring the use performance of the motor 1 unchanged (e.g., torque density, no-load cogging torque).

It is understood that by defining the relationship of Lstk, ns, drout and P so as to satisfy 15≤ Lstk/Drout ×LCM (Ns, P). Ltoreq.19, and performing simulation analysis based on the motor 1 satisfying the above-described parameter definition, the simulation experiment data of the motor 1 supports that the use performance of the motor 1 is unchanged (e.g., torque density, no-load cogging torque), and the amount of the permanent magnet 400 is reduced in practice, that is, the material investment of the permanent magnet 400 is reduced while ensuring the use performance of the motor 1, and the production cost of the motor 1 is reduced.

Further, the rotor core 300 includes a plurality of segmented cores 310, and the rotor 30 further includes a plurality of permanent magnets 400.

The plurality of segmented cores 310 are arranged at intervals along the outer circumference of the stator 10, and one permanent magnet 400 is provided between any adjacent two segmented cores 310. It is understood that the plurality of segmented cores 310 and the plurality of permanent magnets 400 cooperate to form a ring-shaped structure. The plurality of segmented cores 310 and the plurality of permanent magnets 400 are alternately arranged, so that the shape of the permanent magnets 400 is not required to be limited to a tile shape, which is beneficial to reducing the usage amount of the segmented cores 310, and thus, the production cost of the motor 1 can be further reduced. Meanwhile, this arrangement allows the size of the segment core 310 to be not limited by the pole arc coefficient, while the magnetic focusing effect of the parallel magnetic circuit allows the torque density of the motor 1 to be higher. That is, the power of the motor 1 can be increased under the same conditions, and the torque output of the motor 1 can be ensured.

In some embodiments, the inner diameter of stator core 100 is optionally denoted as Dsin, as shown in fig. 1 and 2.

The outer diameter of the stator core 100 is denoted Dsout.

Tooth 114 includes a tooth body 1142 and a tooth shoe 1144.

The tooth body 1142 is connected between the tooth shoe 1144 and the outer peripheral wall of the yoke 112.

The width of the tooth body 1142 in the tangential direction of the stator 10 is denoted as Ws.

The radial depth of the slot opening to the slot bottom of the stator slot 120 is denoted as Hs.

Wherein Dsin×Ws/Dsout/Hs is more than or equal to 0.2 and less than or equal to 0.24.

In this embodiment, the structure of the stator 10 is further defined, specifically, the stator core 100 includes a plurality of stacked stator laminations 110, the stator laminations 110 including teeth 114, the teeth 114 including teeth bodies 1142 and teeth shoes 1144. The tooth body 1142 is connected to the tooth shoe 1144, and the tooth body 1142 is connected to the outer peripheral wall of the yoke 112, that is, the tooth body 1142 is connected between the tooth shoe 1144 and the outer peripheral wall of the yoke 112.

Wherein, the inner diameter of the stator core 100 is denoted as Dsin, the outer diameter of the stator core 100 is denoted as Dsout, the width of the tooth body 1142 in the tangential direction of the stator 10 is denoted as Ws, and the radial depth from the notch of the stator slot 120 to the slot bottom is denoted as Hs. Dsin, dsout, ws and Hs have relevance, specifically, dsin multiplied by Ws/Dsout/Hs is more than or equal to 0.2 and less than or equal to 0.24. By defining the above parameters so as to satisfy the above formula, the performance of the motor 1 can be optimized, for example, the operation efficiency of the motor 1 can be improved. The above limitation can change the winding manner of the coil 200 of the stator 10, can accommodate a larger number of turns of the coil 200, and can provide a magnetic field strength required for the operation of the motor 1 with lower loss of the coil 200. Meanwhile, the circumferential width of the tooth body 1142 can be ensured, effective and reliable structural support is provided for maintaining the iron loss of the motor 1 in a reasonable range, and the saturation of the tooth part 114 is facilitated to be relieved, so that the output of the motor 1 is facilitated to be improved.

Alternatively, dsin×ws/Dsout/hs=0.21, dsin×ws/Dsout/hs=0.22, dsin×ws/Dsout/hs=0.23, and the like, which are not listed here.

In some embodiments, optionally, as shown in fig. 1 and 2, the inner diameter of rotor core 300 is denoted as Drin.

Wherein, the drin/Drout is more than or equal to 0.91 and less than or equal to 0.97.

In this embodiment, the structure of the rotor 30 is further defined.

The inner diameter of the rotor core 300 is denoted as Drin, the outer diameter of the rotor core 300 is denoted as Drout, and a mating structure of the inner diameter Drin of the rotor core 300 and the outer diameter Drout of the rotor core 300, specifically, 0.91. Ltoreq.drin/Drout. Ltoreq.0.97 is defined.

This arrangement has the effect of ensuring the amount of permanent magnet 400 used, providing an effective and reliable structural support for ensuring the performance of the motor 1 (e.g. the torque of the motor 1).

If Drin/Drout <0.91, the amount of the permanent magnet 400 is large, and thus, the material of the permanent magnet 400 is wasted, and thus, the production cost of the motor 1 is increased.

If Drin/Drout >0.97, the amount of permanent magnet 400 used is small, which reduces the magnetic focusing effect and thus the output torque of motor 1.

Alternatively, drin/Drout =0.92, drin/Drout =0.93, drin/Drout =0.94, drin/Drout =0.95, drin/Drout =0.96, and so forth, which are not listed here.

In some embodiments, alternatively, as shown in fig. 1 and 2, the width of the permanent magnet 400 in the tangential direction of the rotor 30 is denoted as Lmt.

The length of the permanent magnet 400 in the radial direction of the rotor 30 is denoted Lmr.

Wherein Lmt/Lmr is more than or equal to 0.3 and less than or equal to 0.7.

In this embodiment, the structure of the permanent magnet 400 is further defined.

Wherein the width of the permanent magnet 400 in the tangential direction of the rotor 30 is denoted as Lmt and the length of the permanent magnet 400 in the radial direction of the rotor 30 is denoted as Lmr. That is, the width of the permanent magnet 400 is denoted as Lmt in the tangential direction of the rotor 30, and the length of the permanent magnet 400 is denoted as Lmr in the radial direction of the rotor 30.

Lmt and Lmr have a correlation, specifically 0.3 +.lmt/Lmr +.0.7, which enables the size of the air gap 60 between the stator 10 and the rotor 30 to be ensured, providing structural support for ensuring the performance of the motor 1. Specifically, the reliability of use of the motor 1 (e.g., the anti-demagnetization capability of the motor 1 is improved) and the production cost are both considered.

If Lmt/Lmr is less than 0.3, the length of the permanent magnet 400 in the tangential direction of the rotor 30 is too small, which may reduce the reliability of the permanent magnet 400, for example, the demagnetization may be easily generated.

If Lmt/Lmr is greater than 0.7, the length of the permanent magnet 400 in the tangential direction of the rotor 30 is excessively large, and thus, the material of the permanent magnet 400 is wasted, which increases the production cost of the motor 1.

Alternatively, lmt/Lmr =0.4, lmt/Lmr =0.45, lmt/Lmr =0.5, lmt/Lmr =0.55, lmt/Lmr =0.6, lmt/Lmr =0.65, and the like, which are not listed herein.

In some embodiments, optionally, the length of permanent magnet 400 is greater than the length of segmented core 310 in the axial direction of rotor 30.

In this embodiment, the structure of the rotor 30 is further defined.

The length of the permanent magnet 400 is greater than the length of the segmented core 310 in the axial direction of the rotor 30. That is, the length of the permanent magnet 400 in the axial direction of the rotor 30 is longer than the length of the segmented iron core 310 in the axial direction of the rotor 30. The purpose of adjusting the end effect of the rotor 30 can be achieved, and the arrangement is beneficial to reducing the end effect of the rotor 30 and improving the output torque of the motor 1.

This arrangement can reduce the material input of the segmented iron core 310, which is advantageous in reducing the input amount of the segmented iron core 310 and in reducing the production cost of the rotor 30, compared to increasing the lengths of the permanent magnet 400 and the segmented iron core 310 in the axial direction of the rotor 30 at the same time.

In some embodiments, optionally, as shown in fig. 1, the rotor 30 further comprises an outer race 500.

The outer ring 500 is fitted over the rotor core 300 and the plurality of permanent magnets 400.

The outer ring 500 is used to fix the plurality of rotor cores 300 and the plurality of permanent magnets 400.

The outer race 500 is a non-magnetically permeable member.

In this embodiment, the structure of the rotor 30 is further defined such that the rotor 30 also includes an outer race 500.

It can be understood that the plurality of block cores 310 and the plurality of permanent magnets 400 enclose an annular structure, and the outer ring 500 is sleeved on the outer sides of the rotor core 300 and the plurality of permanent magnets 400, that is, the inner circumferential wall of the outer ring 500 is attached to the rotor core 300 and the plurality of permanent magnets 400 to achieve the purpose of fixing the rotor core 300 and the plurality of permanent magnets 400 through the outer ring 500, so that the occurrence of displacement of the rotor core 300 and the plurality of permanent magnets 400 is avoided.

It is to be understood that the rotor core 300 includes a plurality of segmented cores 310, and the shape of the outer circumferential wall of the annular structure surrounded by the plurality of segmented cores 310 and the plurality of permanent magnets 400 is adapted to the shape of the inner circumferential wall of the outer ring 500. The stability and reliability of the structure formed by assembling the plurality of segmented iron cores 310 and the plurality of permanent magnets 400 are guaranteed, that is, the matching size of the plurality of segmented iron cores 310 and the plurality of permanent magnets 400 can be guaranteed, so that the uniformity and consistency of the magnetic fields generated by the segmented iron cores 310 and the permanent magnets 400 can be guaranteed, and structural support is provided for guaranteeing the stable and efficient operation of the motor 1.

The outer ring 500 is a non-magnetic conductive member, so that the magnetic force line trend can be prevented from being disturbed, that is, the outer ring 500 has the function of fixing the plurality of segmented iron cores 310 and the plurality of permanent magnets 400, and can also ensure the stable operation of the motor 1.

Optionally, at least one of the segmented iron core 310 and the permanent magnet 400 is assembled with the outer ring 500 by means of gluing.

Optionally, at least one of the segmented iron core 310 and the permanent magnet 400 is assembled with the outer ring 500 by way of insertion.

In some embodiments, optionally, as shown in fig. 1 and 2, the outer diameter of outer race 500 is denoted as Dring.

Wherein, the and Drout/drop is less than or equal to 0.93 and less than or equal to 0.97.

In this embodiment, the structure of the rotor 30 is further defined.

The outer diameter of the outer ring 500 is denoted as drop, and the outer diameter of the rotor core 300 is denoted as Drout. Drain and Drout have a correlation, specifically 0.93≤ Drout/Drain≤0.97. This arrangement can ensure the stability and reliability of the assembly of the rotor core 300 and the permanent magnet 400, and also can ensure the controllability of the external dimensions of the motor 1.

If Drout/drop is less than 0.93, the width of the outer ring 500 in the direction from the stator 10 to the rotor 30 is excessively large, which increases the size of the motor 1.

If Drout/drying is greater than 0.97, the width of the outer ring 500 in the direction from the stator 10 to the rotor 30 is too small, and thus, the force applied to the rotor core 300 and the plurality of permanent magnets 400 by the outer ring 500 is too small, and the plurality of segmented cores 310 of the rotor core 300 and the plurality of permanent magnets 400 are easily dislocated, and stability and reliability of fixing the rotor core 300 and the plurality of permanent magnets 400 cannot be ensured.

In some embodiments, optionally, the direction of magnetization of permanent magnet 400 is tangential to rotor core 300.

The magnetizing directions of the adjacent two permanent magnets 400 are opposite.

In this embodiment, the magnetizing directions of the permanent magnets 400 are further defined such that the magnetizing directions of the permanent magnets 400 are tangential to the rotor core 300, and the magnetizing directions of the adjacent two permanent magnets 400 are opposite.

It can be understood that the magnetizing direction of the permanent magnet 400 is tangential to the rotor core 300 on the axial end face of the rotor core 300, and that the permanent magnet 400 is magnetized in the tangential direction of the rotor core 300 on the axial end face of the rotor core 300.

The arrangement may be such that the portion of the rotor core 300 between adjacent permanent magnets 400 forms an independent magnetic portion, that is, adjacent two permanent magnets 400 may form a set of magnetic pieces. The magnetic part is capable of interacting with the coil 200 of the stator 10 after energizing to achieve the purpose of driving the rotor 30 to rotate relative to the stator 10.

In some embodiments, optionally, as shown in fig. 1 and 2, the stator 10 and rotor 30 enclose an air gap 60.

The length of the air gap 60 in the direction from the stator 10 to the rotor 30 is denoted as Lag.

Wherein, the lang is more than or equal to 0.3mm and less than or equal to 0.5mm.

In this embodiment, the mating structure of the stator 10 and the rotor 30 is further defined.

Wherein the stator 10 and the rotor 30 enclose the air gap 60, i.e. the outer circumferential wall of the stator 10 and the inner circumferential wall of the rotor 30 enclose the air gap 60. The length of the air gap 60 in the direction from the stator 10 to the rotor 30 is denoted as Lag and is defined as Lag satisfying 0.3 mm. Ltoreq.Lag≤0.5 mm. This arrangement gives attention to both the processing technology of the motor 1 and the usability of the motor 1. And this arrangement is advantageous in reducing torque ripple of the motor 1.

If the Lag is less than 0.3mm, the air gap 60 between the stator 10 and the rotor 30 is too small, so that the assembly difficulty of the motor 1 is increased, the assembly efficiency of the motor 1 is reduced, and the production cost of the motor 1 is further increased. At the same time, the arrangement increases the requirements for the machining precision of the stator 10 and the rotor 30, and increases the machining difficulty of the product.

If lang is greater than 0.5mm, the gap between the stator 10 and the rotor 30 is excessively large, which increases the reluctance, and thus the amount of the permanent magnet 400 is required to be increased in order to secure the performance of the motor 1, which increases the production cost of the motor 1.

Alternatively, lag=0.32 mm, lag=0.35 mm, lag=0.38 mm, lag=0.4 mm, lag=0.42 mm, lag=0.45 mm, lag=0.48 mm, and the like, which are not specifically recited herein.

In some embodiments, optionally, as shown in fig. 1, the stator 10 further comprises a multi-phase coil 200.

The multi-phase coil 200 is wound around the stator core 100.

The coil 200 has a circular or rectangular cross-sectional shape, and the coil 200 is formed by winding aluminum wire.

In this embodiment, the structure of the stator 10 is further defined such that the stator 10 further includes a multi-phase coil 200, and the multi-phase coil 200 is wound around the stator core 100.

It will be appreciated that the teeth 114 of the plurality of stator laminations 110 are stacked in the axial direction of the stator 10 to form stator 10 teeth, the number of stator 10 teeth being plural, the plurality of stator 10 teeth being spaced about the axis of the stator 10, the multi-phase coil 200 being wound about the stator 10 teeth.

The coil 200 is sectioned in a direction perpendicular to the length direction of the coil 200, and in the section, a region surrounded by the contour line of the coil 200 forms a section of the coil 200.

The coil 200 has a circular or rectangular cross-sectional shape, that is, the coil 200 is a circular coil, or the coil 200 is a flat wire-shaped coil.

Wherein the coil 200 is wound from aluminum wire, i.e. the material defining the coil 200, in particular the coil 200 is wound from aluminum wire.

As shown in fig. 1, 2 and 3, a vehicle according to still other embodiments of the present application includes an electric motor 1 as in any of the above embodiments.

The vehicle provided by the application comprises the motor in any embodiment, so that the vehicle has all the beneficial effects of the motor, and the description is omitted herein.

It is worth to say that the vehicles include electric bicycles, electric motorcycles, electric scooters, electric balance cars, new energy automobiles, and the like. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

Alternatively, the present application defines a motor 1 with an outer rotor 30 in-wheel. The motor 1 includes a stator 10 and an outer rotor. The stator 10 includes a stator 10 core and an armature winding (the armature winding includes a multi-phase coil 200). The stator 10 core includes a plurality of stator laminations 110 (e.g., silicon steel sheets), and the plurality of stator laminations 110 are stacked in the axial direction of the stator 10. The armature winding is formed by winding an aluminum coil. The rotor 30 includes a rotor core including a plurality of rotor laminations (e.g., silicon steel sheets) stacked in the axial direction of the rotor 30, permanent magnets 400, and an outer ring 500. The permanent magnets 400 are magnetized in the tangential direction, and the magnetizing directions of two adjacent permanent magnets 400 are opposite. The outer race 500 is a non-magnetically conductive member. The rotor core and the permanent magnets 400 are adhered to the inner surface of the outer ring 500 by glue. The motor 1 of the application has high torque density, less permanent magnet 400 consumption and low cost.

The pole pair number of the rotor 30 is P, the number of the stator slots 120 is Ns, the outer diameter of the rotor core 300 is Drout, and the thickness of the stator core 100 is Lstk, wherein 15≤ Lstk/Drout X LCM (Ns, P). Ltoreq.19.

The stator 10 core has a deep slot structure, the inner diameter of the stator core 100 is Dsin, and the outer diameter of the stator core 100 is Dsout. The stator 10 includes a stator core 100, the stator core 100 includes a plurality of stator laminations 110, the stator laminations 110 includes a yoke 112 and a plurality of teeth 114, the teeth 114 are connected to an outer circumferential wall of the yoke 112, the plurality of teeth 114 are arranged at intervals around an axis of the stator 10, the teeth 114 include a tooth body 1142 and a tooth shoe 1144, the tooth body 1142 is connected between the tooth shoe 1144 and an outer circumferential wall of the yoke 112, and a width of the tooth body 1142 in a tangential direction of the stator 10 is denoted as Ws. Any two adjacent tooth portions 114 and yoke portions 112 enclose a slot portion 116, the slot portions 116 of the plurality of stator punching sheets 110 are penetrated along the axial direction of the stator 10 to form a stator slot 120, and the slot depth of the stator slot 120 (i.e. the radial depth from the notch of the stator slot 120 to the slot bottom) is Hs, wherein Dsin×Ws/Dsout/Hs is more than or equal to 0.2 and less than or equal to 0.24.

The coil 200 of the armature winding is a circular coil or a flat coil.

The rotor core includes a plurality of segmented cores 310, and the inner diameter of the rotor core 300 is Drin, wherein, the ratio of Drin/Drout is more than or equal to 0.91 and less than or equal to 0.97.

The permanent magnet 400 has a rectangular structure, the width of the permanent magnet 400 in the tangential direction of the rotor 30 is Lmt, and the length of the permanent magnet 400 in the radial direction of the rotor 30 is Lmr, wherein Lmt/Lmr is more than or equal to 0.3 and less than or equal to 0.7.

The rotor 30 further comprises an outer ring 500, the outer ring 500 is a ring made of non-magnetic conductive material, and the outer diameter of the outer ring 500 is Dring, wherein, the speed is more than or equal to 0.93 and less than or equal to Drout/Dring is less than or equal to 0.97.

The outer peripheral wall of the stator 10 and the inner periphery of the rotor 30 form an air gap 60, and the length of the air gap 60 in the direction from the stator 10 to the rotor 30 is Lag, wherein Lag is more than or equal to 0.3mm and less than or equal to 0.5mm.

The vehicle comprises an electric machine 1.

As shown in fig. 4 and 5, the present application can ensure the use performance (e.g., torque and no-load counter potential) of the motor 1 and reduce the amount of the permanent magnet 400, that is, the amount of the permanent magnet 400 can be reduced while ensuring the use performance of the motor 1, and the production cost of the motor 1 can be reduced, as can be seen from fig. 4 and 5, which show the trend of the no-load counter potential and torque of the motor 1 according to the change of the electrical angle.

Alternatively, the pole pair number of the rotor 30 is p=20, the number ns=36 of the stator slots 120, the outer diameter Drout of the rotor core 300 is 213mm or more and 217mm or less, and the thickness Lstk of the stator core 100 is 20mm or more and 22mm or less.

Alternatively, the inner diameter Dsin of the stator core 100 is 130mm or more and 140mm or less. The outer diameter Dsout of the stator core 100 is 195mm or more and 205mm or less. The width Ws of the tooth body 1142 in the tangential direction of the stator 10 is 7mm or more and 8mm or less. The radial depth Hs from the notch of the stator groove 120 to the groove bottom is 21mm or more and 27mm or less.

Alternatively, the inner diameter Drin of the rotor core 300, the outer diameter Dsout of the stator core 100, and the length Lag of the air gap 60 in the direction from the stator 10 to the rotor 30 satisfy drin= Dsout +2×lag.

Alternatively, the width Lmt of the permanent magnet 400 in the tangential direction of the rotor 30 is 3mm or more and 3.5mm or less.

Alternatively, the length Lmr of the permanent magnet 400 in the radial direction of the rotor 30, the outer diameter Drout of the rotor core 300, and the inner diameter of the rotor core 300 are Drin to satisfy Lmr = (Drout-Drin)/2.

Optionally, the outer diameter of outer race 500 is trailing 226mm.

Optionally, the length Lag of the air gap 60 in the direction from the stator 10 to the rotor 30 is 0.3mm or more and 0.5mm or less.

In the present application, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, as they are used in a fixed or removable connection, or as they are integral with one another, as they are directly or indirectly connected through intervening media. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular 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 application. In this specification, schematic representations of the above terms do not necessarily 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. The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A motor, comprising: A stator, comprising: A stator core, the stator core comprising a plurality of stacked stator laminations, each of which comprises a yoke and a plurality of teeth, the plurality of teeth being connected to an outer peripheral wall of the yoke at intervals along the circumferential direction of the stator, with any two adjacent teeth and the yoke enclosing a slot, the slots of the plurality of stator laminations extending axially through the stator to form stator slots, the thickness of the stator core being denoted as Lstk, and the number of stator slots being denoted as Ns; a rotor disposed around the stator, comprising a rotor core and a plurality of permanent magnets, the rotor core comprising a plurality of segmented cores, the segmented cores being spaced apart along the outer circumference of the stator, with one permanent magnet disposed between any two adjacent segmented cores. The number of pole pairs of the rotor is denoted as P, and the outer diameter of the rotor core is denoted as Drout; Among them, 15≤Lstk/Drout×LCM(Ns,P)≤19. 2. The motor according to claim 1 is characterized in that the inner diameter of the stator core is recorded as Dsin, the outer diameter of the stator core is recorded as Dsout, the tooth portion includes a tooth body and a tooth shoe, the tooth body is connected between the tooth shoe and the outer peripheral wall of the yoke, the width of the tooth body in the tangential direction of the stator is recorded as Ws, and the radial depth of the stator slot from the slot mouth to the slot bottom is recorded as Hs, wherein 0.2≤Dsin×Ws/Dsout/Hs≤0.24. 3 . The motor according to claim 1 , wherein the inner diameter of the rotor core is denoted as Drin, wherein 0.91≤Drin/Drout≤0.97. 4 . The motor according to claim 1 , wherein a width of the permanent magnet in the tangential direction of the rotor is recorded as Lmt, and a length of the permanent magnet in the radial direction of the rotor is recorded as Lmr, wherein 0.3≤Lmt/Lmr≤0.7. 5 . The motor according to claim 1 , wherein the length of the permanent magnet along the axial direction of the rotor is greater than the length of the segmented iron core. 6. The motor according to claim 1 or 2, wherein the rotor further comprises: An outer ring, the outer ring being sleeved on the outer sides of the rotor core and the plurality of permanent magnets, and the outer ring being used to fix the plurality of rotor cores and the plurality of permanent magnets; The outer ring is a non-magnetic conductive part. 7 . The motor according to claim 6 , wherein the outer diameter of the outer ring is denoted as Dring, wherein 0.93≤Drout/Dring≤0.97. 8. The motor according to claim 1 or 2, characterized in that the magnetizing direction of the permanent magnet is tangential to the rotor core, and the magnetizing directions of two adjacent permanent magnets are opposite. 9. The motor according to claim 1 or 2, characterized in that the stator and the rotor enclose an air gap, and the length of the air gap in the direction from the stator to the rotor is recorded as Lag, wherein 0.3 mm ≤ Lag ≤ 0.5 mm. 10. The motor according to claim 1 or 2, characterized in that the stator further comprises a multi-phase coil, the multi-phase coil is wound around the stator core, the cross-section of the coil is circular or rectangular, and the coil is wound with aluminum wire. 11. A vehicle, comprising: A motor as claimed in any one of claims 1 to 10.