CN218771461U - Disc type motor - Google Patents

Abstract

The application provides a disc motor, disc motor includes the casing, rotor and stator set up in the casing along axial interval, rotor and motor shaft fixed connection, stator and casing fixed connection, the stator has the bearing shaft hole, the bearing shaft hole is used for rotating and connects the motor shaft, the rotor includes annular coiling iron core and the axle sleeve based on the integrative casting shaping of coiling iron core, the radial outer peripheral face of axle sleeve makes both combinations along the radial inner peripheral surface of axial and coiling iron core, need not to use mounting such as screw, the structure of rotor is simplified, the assembly degree of difficulty is low, reduce the error accumulation, the position cooperation is accurate, and, the technology is simplified, be favorable to reduce cost, the control beat, the axle sleeve has the motor shaft hole, the motor shaft hole is used for the fixed connection motor shaft, the axle sleeve adopts the casting technology shaping, the radial inner peripheral surface in its motor shaft hole is easy to control, be convenient for with the effective interference fit of motor shaft, the motor shaft hole is coaxial with the bearing shaft hole, and arrange along axial interval.

Description

Disc type motor

Technical Field

The application relates to the technical field of motors, in particular to a disc type motor.

Background

The disk motor, also called axial flux motor, has the characteristics of high torque density, high power density and the like due to the large air gap plane, compact structure and short axial dimension. In application scenarios with limited requirements for size, weight, etc., e.g. in electric vehicle drive motor applications, a disc motor has significant application advantages over a radial motor.

At present, rotors in a disc type motor are usually formed by Soft Magnetic Composite (SMC) in a pressing mode, magnetic steel is of a surface-mounted structure, the structure is simple, mass production is easy, and the disc type motor has certain application in the elevator industry. However, the rotor made of soft magnetic composite material has low strength, so that the application of the disk motor is generally in a low speed condition, while the application of the driving motor of the electric automobile has high requirement on the rotating speed, so that the application of the driving motor of the electric automobile is difficult, and the wound iron core is adopted to replace the soft magnetic composite material iron core.

However, the roundness of the radially inner peripheral surface of the wound core cannot be ensured due to the technical principle of winding and molding, and it is difficult to achieve an effective interference fit with the motor shaft.

For a stator in a disk type motor, the structural adaptability and the combination stability of a shaft sleeve and a stator iron core are difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The application provides a disk motor for alleviate the unable problem of guaranteeing of circularity of the radial inner peripheral surface of coiling iron core, so that with motor shaft interference fit.

In a first aspect, a disc motor is provided, the disc motor includes a housing, a rotor and a stator, the rotor and the stator are axially and alternately disposed in the housing, the rotor is fixedly connected to a motor shaft, the stator is fixedly connected to the housing, the stator has a bearing shaft hole, the bearing shaft hole is used for being rotatably connected to the motor shaft, the rotor includes an annular winding core and a sleeve integrally cast and formed based on the winding core, a radial outer circumferential surface of the sleeve is axially and fixedly matched with a radial inner circumferential surface of the winding core, and the sleeve and the inner circumferential surface are combined without using a fixing member such as a screw.

In a specific possible embodiment, the wound core includes a plurality of magnetic steel slots, each of the magnetic steel slots penetrates through the wound core in a radial direction of the wound core, and each of the magnetic steel slots is configured to receive at least one magnetic steel; the radial outer peripheral surface of the shaft sleeve comprises a plurality of limiting protrusions which are formed by casting each magnetic steel slot integrally, so that circumferential torque can be transmitted conveniently, the shaft sleeve can limit the wound iron core in the axial direction, and the magnetic pulling force of other stators or rotors to the wound iron core in the axial direction can be resisted.

In a specific possible embodiment, the wound core has an axial end face, the sleeve further includes a protective end wall integrally cast and formed on the basis of the axial end face, and the protective end wall covers the axial end face to limit the axial end face with the wound core in the axial direction, and the combination area of the sleeve and the wound core is increased, so that the combination stability is increased.

In a specific possible embodiment, the axial end face of the wound core includes a plurality of sleeve positioning portions, and the protective end wall of the sleeve includes core positioning portions that are integrally cast on a per-sleeve positioning portion basis, respectively; each iron core positioning part and the corresponding shaft sleeve positioning part are mutually limited along the circumferential direction, and torque transmission is facilitated.

In a specific embodiment, the axial end surface of the wound core comprises a plurality of first bar structures extending along the radial direction of the wound core, and the plurality of first bar structures are sequentially distributed at intervals along the circumferential direction of the wound core; the shaft sleeve comprises a second strip-shaped structure which is integrally cast and formed on the basis of each corresponding first strip-shaped structure; one of the first strip-shaped structure and the second strip-shaped structure is a protrusion, and the other is a groove. Because first bar structure and second bar structure all are the bar to along radial extension, when the coiling iron core rotated, can all exert circumference drive torque to the protection end wall everywhere in radial, rotate with the stable winding iron core that drives.

In a specific possible implementation, when the winding core includes a plurality of magnetic steel slots and the first bar-shaped structure is a groove, along the axial direction of the winding core, the projection of each first bar-shaped structure is located between the projections of two adjacent magnetic steel slots. The grooves of the first strip-shaped structures and the magnetic steel slots are axially avoided from each other, so that the grooves and the magnetic steel slots are prevented from being overlapped in the axial direction, and the local structural strength of the wound iron core is reduced.

In a second aspect, a disc motor is provided, where the disc motor includes a housing, a rotor and a stator, the rotor and the stator are axially and alternately disposed in the housing, the rotor is fixedly connected to a motor shaft, the stator is fixedly connected to the housing, the stator has a bearing shaft hole, the bearing shaft hole is used for rotatably connecting to the motor shaft, the rotor includes an annular wound core and a sleeve integrally cast and formed based on the wound core, the sleeve includes a protective end wall integrally cast and formed based on an axial end surface of the wound core, the protective end wall covers the axial end surface of the wound core, and the sleeve is combined with the wound core without using a fixing member such as a screw.

In a specific possible embodiment, the axial end face of the wound core includes a plurality of sleeve positioning portions, and the protective end wall of the sleeve includes core positioning portions integrally cast on a basis of each of the sleeve positioning portions; each iron core positioning part and the corresponding shaft sleeve positioning part are mutually limited along the circumferential direction, and torque transmission is facilitated.

In a specific embodiment, the axial end surface of the wound core comprises a plurality of first bar structures extending along the radial direction of the wound core, and the plurality of first bar structures are sequentially distributed at intervals along the circumferential direction of the wound core; the shaft sleeve comprises a second strip-shaped structure which is integrally cast and formed on the basis of each corresponding first strip-shaped structure; one of the first strip-shaped structure and the second strip-shaped structure is a protrusion, and the other is a groove. Because first bar structure and second bar structure all are the bar to along radial extension, when the coiling iron core rotated, can all exert circumference drive torque to the protection end wall everywhere in radial, rotate with the stable coiling iron core that drives.

In a specific possible implementation, when the winding core includes a plurality of magnetic steel slots and the first bar-shaped structure is a groove, along the axial direction of the winding core, the projection of each first bar-shaped structure is located between the projections of two adjacent magnetic steel slots. The grooves of the first strip-shaped structures and the magnetic steel slots are axially avoided from each other, so that the grooves and the magnetic steel slots are prevented from being overlapped in the axial direction, and the local structural strength of the wound iron core is reduced.

In a third aspect, a disc motor is provided, where the disc motor includes a housing, a rotor and a stator, the rotor and the stator are axially and alternately disposed in the housing, the rotor includes a motor shaft hole for fixedly connecting with a motor shaft, and the stator is fixedly connected with the housing; the stator includes: the stator core comprises a plurality of strip-shaped through grooves, each strip-shaped through groove penetrates through the stator core along the radial direction of the stator core and is provided with an opening positioned on each axial end face of the stator core; the shaft sleeve is formed by integral casting on the basis of the radial inner peripheral surface of the stator core, the strip-shaped through grooves and the radial outer peripheral surface of the stator core, the shaft sleeve comprises a fixing strip fixedly matched with the strip-shaped through grooves, an outer end wall and an inner end wall, the outer end wall and the inner end wall are fixedly connected with the two radial ends of the fixing strip, the inner end wall comprises a bearing shaft hole used for being rotatably connected with a motor shaft, and the bearing shaft hole and the motor shaft hole are coaxial and are arranged at intervals along the axial direction. The shape adaptability of the outer end wall and the radial outer peripheral surface of the stator core, the shape adaptability of the inner end wall and the radial inner peripheral surface of the stator core, and the shape adaptability of the fixing strip and the strip-shaped through groove. And the firmness of the combination of the cast shaft sleeve and the radial inner peripheral surface of the stator core, the radial outer peripheral surface of the stator core and the inner wall of the strip-shaped through groove is better.

In a specific possible implementation scheme, the shaft sleeve further comprises an annular axial protrusion which is integrally cast and molded based on a shaft hole mold located in the radial inner peripheral surface of the stator core, and the radial inner peripheral surface of the axial protrusion is flush with the radial inner peripheral surface of the bearing shaft hole, so that the matching area of the axial protrusion and the bearing is increased, and the problem that the stator is prone to shaking relative to a motor shaft is solved.

In a fourth aspect, a disc motor is provided, where the disc motor includes a housing, a rotor and a stator, the rotor and the stator are axially and alternately disposed in the housing, the rotor includes a motor shaft hole for fixedly connecting with a motor shaft, and the stator is fixedly connected with the housing; the stator includes: the stator core comprises a plurality of strip-shaped through grooves, each strip-shaped through groove penetrates through the stator core along the radial direction of the stator core and is provided with an opening positioned on each axial end face of the stator core; the shaft sleeve is integrally cast and formed on the basis of the radial inner peripheral surface of the stator core, the strip-shaped through grooves and the shaft hole mold located in the radial inner peripheral surface of the stator core, and comprises a plurality of fixing strips fixedly matched with the strip-shaped through grooves respectively, inner end walls fixedly connected with the radial ends of the fixing strips, a bearing shaft hole located in the center of the inner end walls, and annular axial protrusions fixedly connected with the bearing shaft hole, wherein the bearing shaft hole is coaxial with the motor shaft hole and is arranged at intervals along the axial direction, and the radial inner peripheral surface of the bearing shaft hole is flush with the radial inner peripheral surface of the axial protrusions. The inner end wall and the radial inner circumferential surface of the stator core have shape adaptability, and the fixing strip and the strip-shaped through groove have shape adaptability. And the firmness of the combination of the cast shaft sleeve and the inner circumferential surface of the stator core in the radial direction and the inner wall of the strip-shaped through groove is better.

Drawings

Fig. 1 is a schematic view of a disc motor according to an embodiment of the present disclosure;

fig. 2 shows a schematic structural view of a rotor K1 in the disc motor shown in fig. 1;

FIG. 3 shows an exploded view of the rotor shown in FIG. 2;

fig. 4 is a front view of the wound core 1 in the rotor K1 shown in fig. 1 and 2;

fig. 5 is a perspective view of the wound core 1 in the rotor K1 shown in fig. 1 and 2;

fig. 6 is a perspective view showing another perspective view of the wound core 1 in the rotor K1 shown in fig. 1 and 2;

fig. 7 shows a schematic view of the construction of the sleeve 3 in the rotor shown in fig. 2 and 3;

fig. 8 shows a variant of the bushing 3 shown in fig. 7;

fig. 9 shows another variant of the bushing 3 shown in fig. 7;

fig. 10 is a schematic view illustrating the wound core 1 shown in fig. 5 after casting the sleeve 3 shown in fig. 7;

fig. 11 shows a schematic view of the magnetic steel 21 mounted to the structure shown in fig. 10;

fig. 12 shows a schematic structural view of the stator K2 in fig. 1;

FIG. 13 illustrates a variation of the rotor and stator arrangement in the disk motor of FIG. 1;

figure 14 shows another variation of the rotor and stator arrangement in the disc motor of figure 1;

fig. 15 shows another variation of the rotor and stator arrangement in the disc motor of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

The components in the drawings of the embodiments of the present application are only intended to show the working principle of the driving structure or the disc motor, and do not actually reflect the actual size relationship of the components.

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

For convenience of understanding the disc motor provided in the embodiments of the present application, an application scenario thereof is described below. The disc motor may be powered as a motor or as a generator to generate electricity. For example, when the disc motor is applied to an electric vehicle, the disc motor may be used as a driving motor for outputting power, or as a range extender for generating electricity. When the disc type motor is applied to an elevator, power can be provided for the lifting of the elevator car. When the disc motor is applied to aircrafts such as airplanes and the like, the disc motor can provide power for the aircrafts.

Fig. 1 is a schematic view of a disc motor according to an embodiment of the present application, and referring to fig. 1, the disc motor includes: casing 01, motor shaft 02, rotor K1 and stator K2. The housing 01 may specifically include a front end cover and a rear end cover which are oppositely arranged along the axial direction and connected to each other, and enclose an inner cavity, but the form of the housing 01 is not limited thereto, as long as the inner cavity can be formed. Rotor K1 and stator K2 are coaxial, and set up in the inner chamber of casing 01 along axial interval, form air gap G between rotor K1 and the stator K2, wherein, stator K2 and casing 01 fixed connection. The motor shaft 02 sequentially penetrates through the rotor K1 and the stator K2 along the axial direction, and is fixedly connected with the rotor K1 and rotatably connected with the stator K2. The motor shaft 02 is rotatably coupled to opposite end walls (e.g., end wall portions of a front cover and a rear cover) of the housing 01 by a support bearing 03a and a support bearing 03b, respectively, and extends out of the housing 01 through one of the end walls to output power outward by driving the rotor K1 or to receive external power to reversely drive the rotor K1 to rotate for generating electricity. However, the connection manner of the motor shaft 02 and the housing 01 is not limited to the above-mentioned manner as long as the motor shaft 02 extends in the axial direction and is rotatably connected to the housing.

The inner wall of the housing 01 is formed with a support T, which may be a plurality of protruding structures arranged at intervals, and the plurality of protruding structures are distributed at intervals along the circumferential direction to support the radial outer peripheral surface (may be M10 of fig. 12) of the stator K2 and are fixedly connected with the radial outer peripheral surface of the stator K2.

The structure of the rotor K1 will be explained below.

Fig. 2 shows a schematic view of a structure of a rotor K1 in the disk motor shown in fig. 1, and fig. 3 shows an exploded view of the rotor shown in fig. 2. With reference to fig. 2 and 3, the rotor K1 includes: the magnetic steel component comprises a wound iron core 1, a magnetic steel component 2, an annular protective sleeve 4 and an axle sleeve 3 which is integrally cast and molded based on the wound iron core 1. The above parts and their cooperation relationship will be described below.

Fig. 4 is a front view of the wound core 1 in the rotor K1 shown in fig. 1 and 2, fig. 5 is a perspective view of the wound core 1 in the rotor K1 shown in fig. 1 and 2, and fig. 6 is a perspective view of the wound core 1 in the rotor K1 shown in fig. 1 and 2 from another perspective. Meanwhile, with reference to fig. 4, 5, and 6, the main structure of the wound core 1 may be formed by winding the strip-shaped silicon steel sheets 11 layer by layer, and the main structure may be annular, specifically, may be a circular ring as shown in the figure, but may also be other annular structures such as a square ring. The wound core 1 has two end faces disposed opposite to each other in the axial direction, one of the end faces is an axial end face S1, and the other end face is a mating end face S2, and has a radially outer peripheral face M1 and a radially inner peripheral face M2.

Observing the position A of the radial inner circumferential surface M2 of the wound iron core 1, the fact that the end part of the silicon steel sheet 11 on the innermost layer forms a broken step can be found, the roundness of a through hole H1 formed by the circumference of the radial inner circumferential surface M2 can not reach an ideal state, and if the through hole H1 is directly used as a shaft hole to be assembled with a motor shaft 02, effective interference fit can not be carried out; similarly, the outer ring of the silicon steel sheet 11 is also formed with the above-described steps, which also causes a problem that the roundness of the outer ring is not ideal. Fig. 6 does not show the interlayer relationship of the silicon steel sheets 11, and fig. 5 may be referred to for the interlayer relationship of the silicon steel sheets 11. In fig. 4 and 5, in order to clearly show the structure of the silicon steel sheet 11, the outer end of the outer ring is partially lifted and is not attached to the surface of the adjacent inner layer, and when the rotor K1 is assembled, the outer end of the silicon steel sheet 11 is attached to the outer surface of the adjacent inner layer. After the silicon steel sheet 11 is wound into the annular main body structure, a plurality of magnetic steel slots U are radially formed, each magnetic steel slot U radially penetrates through the wound iron core 1 along the wound iron core 1, specifically penetrates from the radial outer peripheral surface M1 to the radial inner peripheral surface M2, the plurality of magnetic steel slots U are circumferentially distributed at intervals along the wound iron core 1, and the magnetic steel slots U may not strictly extend along the radial direction of the wound iron core 1, so that an error allowed in engineering is allowed to exist. The silicon steel sheet 11 is punched after being wound and formed to form the magnetic steel slot U, the inner wall of the magnetic steel slot U can be more flat, and the magnetic steel 21 (introduced later) in the magnetic steel assembly 2 can be smoothly inserted into the opening of the radial outer peripheral surface M1 of the magnetic steel slot U. In addition, also can be before coiling silicon steel sheet 11, punch at silicon steel sheet 11 interval in proper order, the size, shape and the interval of punching can carry out simulation design in advance to make silicon steel sheet 11 coiling shaping back, the inner wall of the magnet steel slot U that forms is level and smooth not have obvious dislocation, punches before coiling, can reduce the degree of difficulty of punching. In addition, in the winding process, the layer at the outermost circle can be punched, and the corresponding holes are spliced to form the magnetic steel slot U after winding. The wound core 1 has high strength and can withstand the stress of the disc motor during high-speed rotation.

Instead of using the silicon steel sheet 11, a strip-shaped metal sheet of other material, such as amorphous alloy and nanocrystalline alloy, may be used.

After the wound core 1 shown in fig. 4 and 5 is formed, the sleeve 3 is integrally cast with the wound core 1 based on an external mold, steel or aluminum may be specifically used for casting when the sleeve 3 is formed by casting, the sleeve 3 is an integrated member, and after casting, the sleeve 3 and the wound core 1 form a firmly connected integral structure.

Fig. 7 shows a schematic structural view of the sleeve 3 in the rotor shown in fig. 2 and 3, and the structural composition of the sleeve 3 will be described with reference to fig. 3, 6 and 7. When the sleeve 3 is cast, it may be cast based on the radially inner peripheral surface M2, the axial end surface S1, and the outer mold of the wound core 1.

Specifically, the shaft sleeve 3 includes a motor shaft fixing portion 31 integrally cast based on the radial inner circumferential surface M2 and the external mold, and the radial outer circumferential surface M3 of the motor shaft fixing portion 31 is axially fixedly fitted with the radial inner circumferential surface M2 of the wound core 1, and since the shaft sleeve 3 is integrally cast, the motor shaft fixing portion 31 can be fitted with the radial inner circumferential surface M2 having a step without a gap, and the coupling firmness is good. The sleeve 3 includes a through hole H2 located at a central position of the motor shaft fixing portion 31, the through hole H2 axially penetrates the motor shaft fixing portion 31, and the through hole H2 is coaxial with the through hole H1. The through hole H2 serves as a motor shaft hole for fixedly connecting with the motor shaft 02, and the motor shaft 02 may be connected with an inner wall of the through hole H2 (a radial inner circumferential surface M4 of the motor shaft fixing portion 31) in an interference fit manner. When the shaft sleeve 3 is formed by casting, the roundness of the through hole H2 is controlled by adopting an external die, the standard roundness of the through hole H2 can be realized by adopting the external die with the standard roundness, and the through hole H2 with better roundness replaces the through hole H1 with the non-ideal roundness in the wound iron core 1, so that the interference fit is realized, and the shaft sleeve 3 is not easy to fall off from the motor shaft 02.

And, motor shaft fixed part 31 is located through-hole H2, can also make axle sleeve 3 and wound core 1 along radial mutual spacing, and protection end wall 32 can be along axial and wound core 1 mutual spacing, guarantees the bonding strength of axle sleeve 3 and wound core 1.

The sleeve 3 further includes a protective end wall 32 integrally cast on the basis of the axial end surface S1, the protective end wall 32 and the motor shaft fixing portion 31 are both coaxial with the wound core 1, and the protective end wall 32 covers the axial end surface S1. In order to facilitate the motor shaft 02 to pass through, the protective end wall 32 is provided with a through hole H3 which is coaxial with the through hole H2, the through hole H3 is surrounded by a radial inner circumferential surface M5, the through hole H2 and the through hole H3 can have the same inner diameter, when the motor shaft 02 passes through the through hole H2 and the through hole H3, the radial inner circumferential surface M4 and the radial inner circumferential surface M5 are arranged at intervals in the axial direction to play a balance role, so that the tendency that the whole rotor K1 turns over relative to the motor shaft 02 is relieved, the contact area with the motor shaft 02 is increased, and the interference fit strength is improved; however, the inner diameters of the radially inner circumferential surface M4 to the radially inner circumferential surface M5 may gradually increase in a stepped manner so that the radially inner circumferential surface M5 is fitted to the relevant structure on the motor shaft 02.

The setting of protection end wall 32 can realize combining with axial terminal surface S1 'S firm, simultaneously, need not to use mounting such as screw to make both combine, makes rotor K1' S simple structure, and the assembly degree of difficulty is low, shortens the size chain in the assembling process, reduces the error accumulation, and the position cooperation is accurate to, technology obtains simplifying, is favorable to reduce cost, controls the beat. The protection end wall 32 can improve the overall combination area of the wound iron core 1 and the shaft sleeve 3, improve the firmness of the combination of the wound iron core and the shaft sleeve 3, improve the stability of the combination of each layer of the silicon steel sheets 11, and provide physical protection for the axial end surface S1.

Continuing to observe fig. 7, the radial outer peripheral surface M3 of the motor shaft fixing portion 31 includes a plurality of limiting protrusions 311 integrally cast based on each of the magnetic steel slots U, and the limiting protrusions 311 are spaced along the circumferential direction. The number of the limiting protrusions 311 may be 3 or more than 3, such as 3, 4, 5, 6, 7, 8 or 9, the limiting protrusions 311 correspond to the positions of the plurality of magnetic steel slots U one by one, the outer contour of each limiting protrusion 311 matches with the inner contour of the corresponding magnetic steel slot U to limit the winding iron core 1 in the axial direction, and the winding iron core 1 may transmit the circumferential torque to the motor shaft fixing portion 31 through the limiting protrusions 311 to drive the motor shaft 02 to rotate; in addition, the motor shaft fixing portion 31 can limit the wound core 1 in the axial direction, and can resist the magnetic pulling force of other stators or rotors on the wound core 1 in the axial direction. The stopper projection 311 also functions as a reinforcing rib to reinforce the structure of the motor shaft fixing portion 31. Specifically, before the motor shaft fixing portion 31 is formed by casting, sand grains or the like are filled into the magnetic steel slot U as an obstacle, and a portion of the magnetic steel slot U close to the radially inner circumferential surface M2 of the wound core 1 is left empty and is not filled with sand grains, so that when the shaft sleeve 3 is formed by casting, molten metal steel or aluminum flows into a space of the magnetic steel slot U which is not filled with sand grains, and the limiting protrusion 311 is formed; to independently forming motor shaft fixed part 31 earlier, later assemble its condition in radial inner peripheral surface M4 of winding iron core 1 along the axial, need adopt great axial thrust to promote motor shaft fixed part 31, make radial inner peripheral surface M4 of winding iron core 1 and the radial outer peripheral surface M3 of motor shaft fixed part 31 take place certain deformation and just can accomplish the assembly, still there is the clearance after the assembly, the matching effect is not good, in addition, be alternate segregation between the inner wall of spacing arch 311 and magnet steel slot U, do not bond, the bonding fastness is poor, and, in order to improve fixed effect, when spacing arch 311's height is great, can't accomplish above-mentioned assembly even. And adopt the mode of casting to form axle sleeve 3, then overcome above-mentioned shortcoming, removed the process of assembly from to, be the inter combination between spacing arch 311 and the inner wall of magnet steel slot U, radial outer peripheral face M3 also is the inter combination with radial inner peripheral face M2, for improving motor shaft fixed part 31 and the fastness of coiling iron core 1 complex. The limiting protrusions 311 are integrally formed on the basis of the magnetic steel slots U when the shaft sleeve 3 is cast, and the limiting protrusions do not need to be fixed by adopting structures such as screws, so that the assembly process is simplified, and the assembly precision is improved. The limiting protrusions 311 may be uniformly distributed on the radial outer circumferential surface M3, and provide uniform torque distribution to the motor shaft fixing portion 31 at various circumferential positions.

With reference to fig. 6 and 7, the axial end surface S1 of the wound core 1 includes a plurality of shaft sleeve positioning portions 12, the protective end wall 32 includes core positioning portions 321 integrally cast and formed based on each shaft sleeve positioning portion 12, and the core positioning portions 321 and the shaft sleeve positioning portions 12 may be in one-to-one correspondence, so that each core positioning portion 321 and the corresponding shaft sleeve positioning portion 12 may be circumferentially limited to each other, thereby facilitating effective torque transmission. Specifically, each of the boss positioning portions 12 is a first bar-shaped structure, and correspondingly, each of the core positioning portions 321 is a second bar-shaped structure. In other words, the axial end surface S1 of the wound core 1 includes a plurality of first bar-shaped structures extending in the radial direction of the wound core 1, and the protective end wall 32 includes second bar-shaped structures each integrally cast on the basis of each of the first bar-shaped structures. Each of the first bar structures extends in the radial direction of the wound core 1 at the axial end surface S1, and these first bar structures are sequentially spaced apart in the circumferential direction of the wound core 1. Wherein, first bar-shaped structure can be the recess of bar, second bar-shaped structure can be the arch of bar, the size and the shape of the outline of second bar-shaped structure and the interior outline of first bar-shaped structure all adapt to each other, so that both are spacing each other in circumference, be convenient for the coiling iron core 1 gives protection end wall 32 with the moment of torsion transmission of circumference, and, because first bar-shaped structure and second bar-shaped structure all are the bar, and along radial extension, make coiling iron core 1 when receiving stator K2's drive and circumferential rotation, can all exert circumference drive moment of torsion to protection end wall 32 in radial everywhere, rotate around iron core 1 with stable drive. When casting the shaft sleeve 3, the core positioning portion 321 and the shaft sleeve positioning portion 12 are structurally combined with each other, and a gap is not easily formed, and the combination firmness is good. The sleeve positioning portions 12 may be evenly distributed at equal intervals in the circumferential direction so that the wound core 1 evenly provides the protective end wall 32 with circumferential torque in the circumferential direction. The core positioning portion 321 may also serve as a reinforcing rib for protecting the surface of the end wall 32, and reinforce the structure of the end wall 32. In addition, along the axial of coiling iron core 1, the projection of every first bar structure can be located between the projection of two adjacent magnet steel slot U, consequently, the recess and the magnet steel slot U of first bar structure avoid each other in the axial to avoid both position coincidence in the axial, reduce the local structural strength of coiling iron core 1.

The adoption forms axle sleeve 3 based on the mode of coiling iron core 1 casting, and rotor K1's structure is simplified by a wide margin, is favorable to solving the problem of volume production difficulty, and the integral type casting structure of coiling iron core 1 and axle sleeve 3 is applicable to electric automobile's disc driving motor's high-speed application scene.

It should be understood that the shape of the core positioning portion 321 may not be a bar shape, and for example, may be a dot shape, a triangle shape, a trapezoid shape, a rectangle shape, a diamond shape, an oval shape, or other shapes, and when the core positioning portion 321 is a bar shape, it may also extend deviating from the radial direction, and may all allow the wound core 1 to transmit torque to the protective end wall 32 to some extent. Further, the core positioning portion 321 is not limited to a protrusion, but may be a groove, as long as one of the core positioning portion 321 and the sleeve positioning portion 12 is a protrusion and the other is a groove, and the shape and the size of the contour of the core positioning portion and the shape and the size of the sleeve positioning portion can be matched with each other, so that the core positioning portion and the sleeve positioning portion are matched with each other.

Through setting up structures such as iron core location portion 321 and spacing arch 311, reduce the screw and use, can improve rotor K1's electromagnetic property.

The mating end surface S2 faces the stator K2 and forms an air gap G with the stator K2. The end face S2 is not provided with the protective end wall 32, so as to avoid an excessively large air gap G and ensure good magnetic coupling with the stator K2.

Fig. 8 shows a modification of the sleeve 3 shown in fig. 7, and referring to fig. 8, the stopper projection 311 may be eliminated from the axial end surface S1, and accordingly, the core positioning portion 321 may be eliminated from the structure shown in fig. 7. Since the protective end wall 32 has a large bonding area, the bonding strength with the axial end surface S1 can be satisfied to a certain extent, and the casting difficulty can be reduced.

Fig. 9 shows another modification of the sleeve 3 shown in fig. 7, and referring to fig. 9, the limiting protrusion 311 on the outer circumferential surface M3 in the radial direction of the motor shaft fixing portion 31 can be eliminated on the basis of the structure shown in fig. 7, which is beneficial to reducing the casting difficulty.

Fig. 10 shows the wound core 1 shown in fig. 5 after casting the sleeve 3 shown in fig. 7, and referring to fig. 10, the motor shaft fixing portion 31 covers the inner wall of the through hole H1 (the radially inner circumferential surface M2 of the wound core 1), the through hole H1 is replaced with the through hole H2 of the motor shaft fixing portion 31, and the outer diameter of the protective end wall 32 is larger than the outer diameter of the wound core 1 to replace the outer contour of the wound core 1 with the outer contour of the protective end wall 32.

The material used for each part of the cast shaft sleeve 3 is easy to machine. After the sleeve 3 is cast, the surfaces of the radially inner circumferential surface M4, the radially inner circumferential surface M5, the radially outer circumferential surface M6, and the protective end wall 32 facing away from the wound core 1 are machined, such as turning and grinding, to ensure the flatness of the surfaces, to correct the inner diameter, the outer diameter, the thickness, and other dimensions of the motor shaft fixing portion 31 and the protective end wall, and to ensure the roundness of the radially inner circumferential surface M4, the radially inner circumferential surface M5, and the radially outer circumferential surface M6.

In addition, for the case that the stators are distributed on both sides in the axial direction, the protective end wall 32 of the rotor K1 can be eliminated, so that the wound core 1 and the stators on both sides can keep a small air gap G, and the performance of the disc motor is improved.

In fig. 3, the magnetic steel assembly 2 includes a plurality of magnetic steels 21 corresponding to the magnetic steel slots U one to one. Fig. 11 shows a schematic view of the magnetic steel 21 mounted on the structure shown in fig. 10, after casting of the shaft sleeve 3 is completed, referring to fig. 11, each magnetic steel 21 is inserted into a corresponding magnetic steel slot U, at this time, an opening of the magnetic steel slot U located on the radial inner circumferential surface M2 is already blocked by the motor shaft fixing portion 31, and therefore, specifically, the opening of the magnetic steel slot U located on the radial outer circumferential surface M1 is inserted along the radial direction, and compared with a scheme of casting the shaft sleeve 3 after the magnetic steel 21 is inserted first, the magnetic steel 21 is not easily damaged due to an excessively high casting temperature. When the radial outer circumferential surface M3 of the motor shaft fixing portion 31 is provided with the limiting protrusion 311, the limiting protrusion 311 occupies a part of the space in the magnetic steel slot U, and the radial length of the magnetic steel 21 in the winding core 1 is smaller than the total depth of the magnetic steel slot U. The number of punches of the winding equipment for winding the iron core 1 is limited, the fan-shaped grooves cannot be formed, and in order to ensure the pole arc coefficient, the magnetic steel 21 is segmented, so that the performance of the motor can be ensured. The length of the magnetic steel 21 in the radial direction is smaller than the total depth of the magnetic steel slot U, so that the magnetic steel 21 can be segmented in the radial direction.

The arrangement mode of magnet steel 21 can adopt: a single-letter structure, a double-letter structure, a V + letter structure, a single-V letter structure, a double-V letter structure, a single-U letter structure, a double-U letter structure, a three-layer U letter structure, and the like.

The wound iron core 1 has stronger structural strength, can meet the strength requirement of the rotor K1 under high-speed rotation, and has low high-speed loss; for the magnet steel of table subsides formula, in this application embodiment, insert magnet steel 21 in magnet steel slot U, it is spacing all to carry out in two opposite directions of axial to magnet steel 21 that winding core 1 can resist the axial magnetic pull of stator K2 or other rotors to can fix a position magnet steel 21 on circumference, and to magnet steel 21 transmission moment of torsion.

It should be understood that magnet steel slot U is not necessarily corresponding to magnet steel 21 in quantity, and magnet steel's 21 quantity can be more than magnet steel slot U, and quantity in every magnet steel slot U can be more than two, like 2, 3 and 4 etc. to, quantity in the magnet steel slot U of difference can be the same, also can be different, as long as every magnet steel slot U accomodates a magnet steel 21 can.

After the magnetic steel 21 is installed, returning to fig. 2, and combining fig. 10, carbon fibers are wound on the radial outer peripheral surface M1 of the wound iron core 1 to serve as an annular protective sleeve 4, so that the magnetic steel 21 is prevented from jumping out of the magnetic steel slot U under the action of centrifugal force generated when the rotor K1 rotates; and, can prevent that the silicon steel sheet 11 of coiling iron core 1 from unclamping under the centrifugal force effect, in addition, annular protective sheath 4 still can provide physical protection for magnet steel 21. Based on the above points, the annular protection sleeve 4 provides a certain guarantee for the stability of the operation of the rotor K1. Wherein, the annular protective sleeve 4 formed by winding the carbon fiber is anisotropic, and the shearing strength between layers is very low.

The annular protective sheath 4 may be formed by winding carbon fiber by a dry method or a wet method. The resin content and the quality of the prepreg yarns can be strictly controlled in the dry winding process, the quality control is easy to control, and the yield is high; the wet-process winding cost is low, the adopted resin glue solution can reduce the abrasion among all layers of carbon fibers, and the parallelism of all layers of carbon fibers is good, so that the carbon fibers can be kept flush with the edge of the radial outer peripheral surface M1, and the winding quality is high. Or the carbon fiber can be made into the annular shape of the annular protective sleeve 4, and then the annular protective sleeve 4 is sleeved on the radial outer peripheral surface M1 in a cold sleeve or hot sleeve mode.

The annular protective sleeve 4 can be formed by carbon fiber, can also be made of corrosion-resistant rubber, plastic, metal and other fiber materials, wherein when metal is selected, the annular protective sleeve can be a steel ring, and the inner wall of the steel ring is filled with buffer materials such as a rubber ring, so long as the annular protective sleeve can be sleeved on the radial outer peripheral surface M1 to help the magnetic steel 21 to resist centrifugal force.

In order to prevent that magnet steel 21 radially rocks in magnet steel slot U when rotor K1 rotates, magnet steel 21's one end and spacing protruding 311 butt, the other end and the 4 butts of annular protective sheath, when not setting up spacing protruding 311, magnet steel 21 is direct with radial outer peripheral face M3 butt.

When motor shaft fixed part 31 is located through-hole H1, motor shaft 02 is located motor shaft fixed part 31 inboard with motor shaft hole (through-hole H1) interference fit's position, and the centre of gravity of rotor K1 is comparatively close with the center of through-hole H2, and the coincidence even, rotor K1 is difficult for rocking when the operation. The sleeve 3 is not limited to the combination of the motor shaft fixing portion 31 and the protective end wall 32, and it is possible to eliminate the motor shaft fixing portion 31, but it should be understood that the motor shaft fixing portion 31 can increase the contact area with the wound core and improve the bonding strength.

Further, when the sleeve 3 is cast, the protective end wall 32 is integrally cast on the axial end surface S1 to form the motor shaft fixing portion 31. Alternatively, the sleeve 3 includes the protective end wall 32 integrally cast on the basis of the axial end surface S1, without including the motor shaft fixing portion 31. At this time, a through hole H3 surrounded by the radially inner peripheral surface M5 of the protective end wall 32 is fixedly connected to the motor shaft 02 as a motor shaft hole.

The structure of the stator K2 will be explained.

Fig. 12 shows a schematic structural view of the stator K2 in fig. 1, and referring to fig. 12, the stator K2 includes a stator core 6 and a sleeve 5. Wherein, stator core 6 is the annular, and it can be the iron core of coiling formation, also can form along the annular orbit concatenation by a plurality of massive structures, and no matter form with which kind of mode, this stator core 6 all includes a plurality of bar through groove P, and every bar through groove P runs through stator core 6 along stator core 6's radial.

The strip through slots P penetrate from the radially outer peripheral surface M8 to the radially inner peripheral surface M9, and each strip through slot P has openings at both axial end surfaces of the stator core 6 so as to wind stator windings, which may be copper wires or other commonly used metal wires, and are connected in a three-phase arrangement. The stator winding cuts the axial magnetic field generated by the magnetic steel 21 to drive the rotor to rotate.

When the shaft sleeve 5 is formed by casting, the shaft sleeve 5 includes a plurality of fixing bars (not shown in the drawings) fixedly fitted in the plurality of bar-shaped through grooves P, outer end walls 52 and inner end walls 511 fixedly connected to both radial ends of the plurality of fixing bars, and an annular axial protrusion 512 fixedly connected to a bearing shaft hole, based on the radial inner circumferential surface M9 of the stator core 6, the bar-shaped through grooves P, the radial outer circumferential surface M8 of the stator core 6, and a shaft hole mold located in the radial inner circumferential surface M9, which are integrally cast. The outer end wall 52 and the inner end wall 511 are perpendicular to the axial direction of the stator core 6. The fixed strip is favorable to increasing the area of contact of axle sleeve 5 and stator core 6, improves and combines stability. The inner end wall 511 includes a through hole H4 at a central position, with the through hole H4 as a bearing shaft hole, which is rotatably connected to the motor shaft 02 via a bearing Q. The bearing shaft hole of the stator K2 is coaxial with the motor shaft hole of the rotor K1 and is arranged at an interval in the axial direction.

For the case that the above parts of the shaft sleeve are molded respectively and then assembled on the stator core 6, the outer end wall 52 and the inner end wall 511 are connected to form an integrated structure through the fixing strip located in the strip-shaped through groove P, and the structural stability of the combination of the three parts is better. Further, the shape-fittingness of the outer end wall 52 to the radially outer peripheral surface M8 of the stator core 6, the shape-fittingness of the inner end wall 511 to the radially inner peripheral surface M9 of the stator core 6, and the shape-fittingness of the fixing bar to the bar-shaped through groove P are all better. And the firmness of the combination of the shaft sleeve 5 molded by casting and the inner walls of the radial inner peripheral surface M9, the radial outer peripheral surface M8 and the strip-shaped through groove P is better. Further, the radially outer peripheral surface M10 of the outer end wall 52 may be cast-molded into the sleeve 5 instead of the radially outer peripheral surface M8 as a surface to be fitted to the holder T, and therefore, the roundness of the radially outer peripheral surface M10 of the outer end wall 52 is more easily controlled to improve the roundness of the stator K2.

Further, since the outer end wall 52 is provided at the radially outer peripheral surface M1, it is possible to prevent shielding of both surfaces of the stator core 6 which are opposite in the axial direction, to avoid reducing the air gap G with the adjacent rotor K1.

Axial bulge 512 is favorable to increasing the area of contact of axle sleeve 5 and bearing Q, improves stator K2 and bearing Q complex stability, alleviates axle sleeve 5 and easily rocks the problem for bearing Q. The radially inner peripheral surface M12 of the axial projection 512 is flush with the radially inner peripheral surface M11 so as to improve the fit with the bearing Q. When casting the sleeve 5, the shaft hole mold may not be provided, and accordingly, the sleeve 5 does not include the axial projection 512, and the contact area of the bearing shaft hole and the bearing Q can be increased by increasing the thickness of the inner end wall 511.

When casting the sleeve 5, the radially outer circumferential surface M8 may not be used as a casting base, and the sleeve 5 formed by casting does not include the outer end wall 52, and in this case, the fixing strip is fixedly connected to the inner end wall 511 only at one end in the radial direction.

The arrangement of the rotor and the stator in the disk motor is not limited to the arrangement of fig. 1, for example: fig. 13 shows a variant of the rotor and stator arrangement in the disk motor of fig. 1, in which a stator K2 is arranged between two rotors K1; fig. 14 shows another variant of the rotor and stator arrangement in the disk motor of fig. 1, in which a rotor K1 is arranged between two stators K2; fig. 15 shows another variation of the arrangement of the rotor and the stator in the disk motor shown in fig. 1, which includes a plurality of rotors K1 and a plurality of stators K2, wherein the rotors K1 and the stators K2 are sequentially and alternately arranged along the axial direction. In the above various modifications, the embodiment corresponding to fig. 1 is different only in the arrangement of the rotor K1 and the stator K2. The matching relationship between adjacent rotors K1 and stators K2, with reference to the corresponding embodiment of fig. 1, forms an air gap G. Please refer to the embodiment corresponding to fig. 1 for the matching relationship between the rotor K1 and the stator K2 and the motor shaft 02. In the above, as long as at least one stator K2 adopts the stator structure in the foregoing embodiment, or as long as at least one rotor K1 adopts the rotor structure in the foregoing embodiment, or as long as at least one stator K2 adopts the stator structure provided in the foregoing embodiment and at least one rotor K1 adopts the rotor structure provided in the foregoing embodiment, other types of stators or rotors may be adopted.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. The utility model provides a disk motor, includes casing, rotor and stator, its characterized in that, the rotor with the stator along axial interval set up in the casing, rotor and motor shaft fixed connection, the stator with casing fixed connection, the stator has the bearing shaft hole, the bearing shaft hole is used for rotating the connection the motor shaft, the rotor includes annular coiling iron core and is based on coiling iron core integrated casting's axle sleeve, the radial outer peripheral face of axle sleeve along the axial with coiling iron core's radial inner peripheral surface fixed coordination, the axle sleeve has the motor shaft hole, the motor shaft hole is used for fixed connection the motor shaft, the motor shaft hole with the bearing shaft hole is coaxial, and along axial interval arrangement.

2. The disc motor according to claim 1, wherein the wound core includes a plurality of magnetic steel slots, each magnetic steel slot penetrating the wound core in a radial direction of the wound core, each magnetic steel slot for receiving at least one magnetic steel;

the radial outer peripheral surface of the shaft sleeve comprises a plurality of limiting bulges which are integrally cast and formed based on each magnetic steel slot.

3. The disc motor according to claim 1 or 2, wherein the wound core has an axial end face, and the sleeve further includes a protective end wall integrally cast based on the axial end face, the protective end wall covering the axial end face.

4. The disc motor according to claim 3, wherein an axial end surface of the wound core includes a plurality of sleeve positioning portions, and the protective end wall of the sleeve includes core positioning portions integrally cast on a per-sleeve positioning portion basis, respectively;

and each iron core positioning part and the corresponding shaft sleeve positioning part are mutually limited along the circumferential direction.

5. The disc motor according to claim 3, wherein the axial end face of the wound core includes a plurality of first bar structures extending in a radial direction of the wound core, the plurality of first bar structures being sequentially spaced in a circumferential direction of the wound core;

the shaft sleeve comprises a second strip-shaped structure which is integrally cast and molded on the basis of each corresponding first strip-shaped structure;

one of the first strip-shaped structure and the second strip-shaped structure is a protrusion, and the other is a groove.

6. The disc motor according to claim 5, wherein when the winding core includes a plurality of magnetic steel slots and the first bar structures are grooves, a projection of each of the first bar structures is located between projections of two adjacent magnetic steel slots in an axial direction of the winding core.

7. The utility model provides a disk motor, includes casing, rotor and stator, its characterized in that, the rotor with the stator along axial interval set up in the casing, rotor and motor shaft fixed connection, the stator with casing fixed connection, the stator has the bearing shaft hole, the bearing shaft hole is used for rotating the connection the motor shaft, the rotor includes annular coiling iron core and is based on the integrative casting fashioned axle sleeve of coiling iron core, the axle sleeve includes based on the integrative casting fashioned protection end wall of axial terminal surface of coiling iron core, protection end wall covers the axial terminal surface of coiling iron core, the axle sleeve has the motor shaft hole, the motor shaft hole is used for fixed connection the motor shaft, the motor shaft hole with the bearing shaft hole is coaxial, and follow axial interval arrangement.

8. The disc motor according to claim 7, wherein an axial end surface of the wound core includes a plurality of sleeve positioning portions, and a protective end wall of the sleeve includes core positioning portions integrally cast on a basis of each of the sleeve positioning portions, respectively;

and each iron core positioning part and the corresponding shaft sleeve positioning part are mutually limited along the circumferential direction.

9. The disc motor according to claim 7, wherein the axial end face of the wound core includes a plurality of first bar structures extending in a radial direction of the wound core, the plurality of first bar structures being sequentially spaced in a circumferential direction of the wound core;

the shaft sleeve comprises a second strip-shaped structure which is integrally cast and formed on the basis of each corresponding first strip-shaped structure;

one of the first strip-shaped structure and the second strip-shaped structure is a protrusion, and the other is a groove.

10. The disc motor according to claim 9, wherein when the winding core includes a plurality of magnetic steel slots and the first bar structures are grooves, a projection of each of the first bar structures is located between projections of two adjacent magnetic steel slots in an axial direction of the winding core.

11. A disk type motor comprises a shell, a rotor and a stator, and is characterized in that the rotor and the stator are axially arranged in the shell at intervals, the rotor comprises a motor shaft hole for being fixedly connected with a motor shaft, and the stator is fixedly connected with the shell;

the stator includes:

the stator core comprises a plurality of strip-shaped through grooves, each strip-shaped through groove penetrates through the stator core along the radial direction of the stator core and is provided with an opening positioned on each axial end face of the stator core;

the shaft sleeve is integrally cast and formed on the basis of the radial inner peripheral surface of the stator core, the strip-shaped through grooves and the radial outer peripheral surface of the stator core, the shaft sleeve comprises a fixing strip fixedly matched with the strip-shaped through grooves, an outer end wall and an inner end wall, the outer end wall and the inner end wall are fixedly connected with the radial two ends of the fixing strip, the inner end wall comprises a bearing shaft hole used for being rotatably connected with a motor shaft, and the bearing shaft hole and the motor shaft hole are coaxial and are arranged at intervals along the axial direction.

12. The disc motor according to claim 11, wherein the sleeve further includes an axial projection that is integrally cast and formed in an annular shape based on a shaft hole mold located in a radially inner peripheral surface of the stator core, and a radially inner peripheral surface of the axial projection is flush with a radially inner peripheral surface of the bearing shaft hole.

13. A disc type motor comprises a shell, a rotor and a stator, and is characterized in that the rotor and the stator are axially arranged in the shell at intervals, the rotor comprises a motor shaft hole fixedly connected with a motor shaft, and the stator is fixedly connected with the shell;

the stator includes:

the stator core comprises a plurality of strip-shaped through grooves, each strip-shaped through groove penetrates through the stator core along the radial direction of the stator core and is provided with an opening positioned on each axial end face of the stator core;

the shaft sleeve is integrally cast and formed on the basis of the radial inner peripheral surface of the stator core, the strip-shaped through grooves and the shaft hole mold located in the radial inner peripheral surface of the stator core, and comprises a plurality of fixing strips fixedly matched with the strip-shaped through grooves respectively, inner end walls fixedly connected with the radial ends of the fixing strips, a bearing shaft hole located in the center of the inner end walls, and annular axial protrusions fixedly connected with the bearing shaft hole, wherein the bearing shaft hole is coaxial with the motor shaft hole and is arranged at intervals along the axial direction, and the radial inner peripheral surface of the bearing shaft hole is flush with the radial inner peripheral surface of the axial protrusions.

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