CN108242860B - Iron core-free stator and motor - Google Patents

Abstract

The invention discloses an iron-coreless stator and a motor. The iron-coreless stator comprises a plurality of annular spoke-shaped single-phase winding disks, wherein one single-phase winding disk is used as a reference disk, and the other single-phase winding disks are used as stacked disks. Each single-phase winding disk comprises a plurality of sector coil units uniformly distributed along the circumferential direction. The plurality of single-phase winding disks are coaxial and uniformly staggered and stacked in the circumferential direction in sequence. The straight edges of the sector coil units on all the single-phase winding disks form spokes of the single-phase winding disks along radially extending sections. The spokes of all the single-phase winding disks are located in the same plane. The iron-coreless stator and the motor have spokes that are not affected by the straight edge sections connected to them in sequence at both ends and the inner and outer ring edges. All the single-phase winding disks can truly realize that the spokes are located in the same plane. The width of a single spoke does not affect the flatness of all the spokes of the stacked disk, so the winding structure of the sector coil unit of the single-phase winding disk is not restricted. In addition, the windings in the sector coil unit are fixed, so the integrity is good and the strength is high.

Description

A coreless stator and motor

Technical Field

The invention relates to motor equipment, in particular to an iron-coreless stator and a motor.

Background Art

In the Chinese patent application disclosures CN 104779728 A and CN 204392045 U, a winding structure of a disc-type ironless core motor stator is disclosed, comprising a plurality of closed coils, the coils are staggered at an angle along the circumference and stacked in the same direction in sequence to form a closed annular structure, the coils include a pair or more of magnet sweeping edges that are straight segments and inner and outer ineffective edges connected to the inner and outer ends of the magnet sweeping edges so that the coils form a closed annular structure, all the magnet sweeping edges in the winding are located in the same plane and have the same height, the inner and outer ineffective edges of each coil are respectively bent and convexly arranged relative to the corresponding magnet sweeping edges, and are simultaneously stacked on each other to form inner and outer overlapping portions that convexly convexly convexly convexly relative to the magnet sweeping edges. The winding structure of the disc-type ironless core motor stator is achieved by bending the inner and outer ineffective edges into an arc or wavy structure, and stacking them in an interlaced manner so that all the magnet sweeping edges in the winding are located in the same plane and have the same height. However, in the actual production process, the magnet sweeping edges connected to the inner and outer invalid edges are difficult to be located in the same plane and have the same height due to the bending tendency of the arc or wavy structure of the inner and outer invalid edges. That is, the thickness of the winding structure of the disc-type ironless coreless motor stator produced will be greater than that of a layer of structure. Especially when the width of the magnet sweeping edge is large, affected by the bending tendency of the arc or wavy structure of the inner and outer invalid edges, a single magnet sweeping edge itself is difficult to be parallel to the plane formed by several coils, but is inclined. Several magnet sweeping edges in an inclined state cannot be located in the same plane. For this reason, the width of the magnet sweeping edge is required to be as small as possible. The winding structure of the disc-type ironless coreless motor stator, the coil is usually axially spirally wound and has a large thickness. Therefore, the winding structure of the disc-type ironless coreless motor stator still cannot meet the requirements of small size and high power; the other several closed coils stacked in the same direction have weak integrity and are difficult to fix, and the strength after fixation is also weak.

Summary of the invention

One of the objects of the present invention is to provide an ironless stator.

A coreless stator comprises a plurality of annular spoke-shaped single-phase winding disks, wherein one single-phase winding disk is used as a reference disk, and the other single-phase winding disks are used as stacked disks, each single-phase winding disk comprises a plurality of sector coil units uniformly distributed and connected along the circumferential direction, the two arc edges of the sector coil units of each single-phase winding disk respectively form inner and outer ring edges, the plurality of single-phase winding disks are coaxially and uniformly staggered and stacked in the circumferential direction, the straight edges of all the sector coil units on the stacked disk are bent axially away from the reference disk side to form a U shape, the straight edges of the sector coil units on all the single-phase winding disks form the spokes of the single-phase winding disk along the radial direction section, and the lengths of the spokes of all the single-phase winding disks decrease successively from the two sides of the reference disk to the outside, the spokes of the stacked disk are located between the inner and outer ring edges of the adjacent single-phase winding disk close to the reference disk side, and the spokes of all the single-phase winding disks are located in the same plane.

Furthermore, the sector coil unit of the single-phase winding disk is a vortex winding structure of a single coil on a sector plane. In this way, the coreless stator formed by a plurality of stacked single-phase winding disks has a thickness of only a single wire in the final effective section, which greatly reduces the thickness of the coreless stator, shortens the magnetic path passing through the coreless stator, improves the motor efficiency, and at the same time, makes the motor body small and light.

Furthermore, the stacked disk is connected to the two ends of the spokes and the two straight side sections corresponding to the U-shaped side are bent radially outward respectively. In actual production, before and after the stacked disk composed of the fan-shaped coil units is bent into a U-shape, the change requirement of the inner ring side circumference can generally be achieved by leaving gaps between adjacent fan-shaped coil units, or by converting the two arc sides of the fan-shaped coil units with the two straight side sections corresponding to the U-shaped side, etc. The change requirement of the outer ring side circumference can generally be achieved by reserving gaps between adjacent fan-shaped coil units, or by converting the two arc sides of the fan-shaped coil units with the two straight side sections corresponding to the U-shaped side, or by deforming the two arc sides of the fan-shaped coil units along the radial bending of the stacked disk, etc. Of course, before and after the bending, the inner and outer rings are The smaller the change in the circumference of the edge, the easier it is to achieve the above method, that is, the more convenient it is to press and bend the stacked disk. Therefore, the present invention connects the stacked disk to the two ends of the spokes and bends the two straight edge sections corresponding to the U-shaped side portions radially outward. On the one hand, the change in the inner and outer ring edges of the stacked disk before and after bending is reduced, so that the stacked disk can be easier to meet the forming requirements; on the other hand, the inner and outer ring edges of the stacked disk are made parallel to the plane where the single-phase winding disk is located. When the width of the inner and outer ring edges is large, the radial inner and outer end thicknesses of the coreless stator can be greatly reduced, and the bending indentations make the stacked disk stronger.

Furthermore, the reference disk is a planar structure, that is, the straight sides of its sector coil unit are spokes. The reference disk can be a planar structure or a U-shaped structure bent like a stacked disk. Compared with the latter, the end thickness of the reference disk with a planar structure is thinner.

A second object of the present invention is to provide an ironless core motor.

A coreless motor comprises an ironless stator, a magnetic steel rotor assembly and a motor shaft provided by one of the purposes of the present invention, wherein the ironless stator is fixedly installed in a winding fixing support frame, and the winding fixing support frame is installed on the motor shaft through a bearing assembly, and the magnetic steel rotor assembly comprises a rotor disk and a plurality of magnetic steels distributed on the inner wall of the rotor disk, and the magnetic steel rotor assembly is coaxially arranged on the side of the ironless stator, and the rotor disk is fixedly connected to the motor shaft, and the radial length of the magnetic steel is less than the minimum value of the spoke length of all single-phase winding disks of the ironless stator, and the magnetic steel corresponds to the position of the spoke with the smallest length.

Furthermore, the shape of the magnetic steel is a fan-shaped structure with the motor shaft as the center. Compared with rectangular, circular and other structures, the magnetic steel of the fan-shaped structure can generate a larger magnetic field area, thereby obtaining a motor with greater power.

Furthermore, the winding fixed support frame includes two fixed end covers, and the inner side of the fixed end covers is provided with a plurality of annular grooves corresponding to the inner and outer ring edges of the single-phase winding disk of the coreless stator, and the inner and outer ring edges of all single-phase winding disks are respectively located in the annular grooves corresponding to their positions, and the two fixed end covers are assembled and fixedly connected. The fixed support frame composed of the two fixed end covers has a firm structure, and when the coreless stator is fixedly installed in the winding fixed support frame, it is only necessary to insert the inner and outer ring edges of each single-phase winding disk into the corresponding annular groove, and the assembly relationship is simple.

Furthermore, the winding fixing support frame has a wall groove, and the wall groove of the winding fixing support frame is filled with a solidified material, so that the winding fixing support frame has a greater strength without deformation, thereby avoiding friction with the magnetic steel.

Furthermore, there are two magnetic steel rotor assemblies, which are respectively distributed on both sides of the coreless stator. The two magnetic steel rotor assemblies work together to form a magnetic field, which is stronger than the magnetic field of a single magnetic steel rotor assembly on one side, and the motor power obtained is greater.

Furthermore, the rotor disk is provided with an air inlet and a plurality of partitions located at the air inlet. The rotor disk is used to fix the magnetic steel on one hand, and on the other hand, drives the partitions during rotation to form wind, which enters the motor from the air inlet to dissipate heat from the motor. The structure is simple, and the heat dissipation structure is integrated, so that the motor does not need to be equipped with an additional heat dissipation structure, and the motor volume is smaller.

Furthermore, the bearing assembly includes a bearing chamber, a bearing installed in the bearing chamber and fixed on the motor shaft, a cover plate and bolts. The bearing chamber includes a first part and a second part that are axially spaced and arranged in parallel. The inner edge of the winding fixing support frame is located in the gap between the first part and the second part. The outer sides of the first part and the second part are respectively provided with a cover plate located on the outer side of the bearing. The inner diameter of the cover plate is larger than the outer diameter of the inner ring of the bearing and smaller than the outer diameter of the outer ring of the bearing. The bolts pass through one side cover plate, the first part of the bearing chamber, the winding fixing support frame, the second part of the bearing chamber and the other side cover plate in sequence to lock the cover plate, the bearing chamber and the winding fixing support frame. The inner diameter of the cover plate is larger than the outer diameter of the inner ring of the bearing and smaller than the outer diameter of the outer ring of the bearing. After being locked by bolts, the two cover plates can play an axial limiting role to prevent the first part, the second part and the winding fixing support frame located therebetween from axial movement, and the bearing is sealed to prevent ash tips from touching the bearing. With this arrangement, the inner wall area of the winding fixing support frame is smaller. In this way, the winding fixing support frame is locked in the bearing chamber by the cover plate and bolts. Compared with the structure in which the winding fixing support frame is directly fixed to the bearing, it is more stable, firm and reliable.

The coreless stator and motor of the present invention are formed by axially bending the two ends of the straight sides of all the sector coil units on the stacked disk into a U shape. When bending, the change requirement of the circumference of the inner ring side of the stacked disk can generally be achieved by reserving the gap between adjacent sector coil units, or by converting the two arc sides of the sector coil unit with the two straight side sections corresponding to the U-shaped side, and the change requirement of the circumference of the outer ring side of the stacked disk can be achieved by reserving the gap between adjacent sector coil units, or by converting the two arc sides of the sector coil unit with the two straight side sections corresponding to the U-shaped side, or by converting the two arc sides of the sector coil unit with the two straight side sections corresponding to the U-shaped side, The deformation of the two arc edges of the element along the radial bending of the stacked disk is achieved, that is, the circumference of the inner ring edge before and after bending is increased and the circumference of the outer ring edge is reduced, and the spoke lengths of all single-phase winding disks are reduced from the two sides of the reference disk to the outside in sequence, so that the spokes of the stacked disk are axially misaligned with the inner and outer ring edges at both ends, and after uniformly staggered stacking, all the spokes of the single-phase winding disks can be located in the same plane; in the coreless stator and motor, the straight edges of the sector coil units on the stacked disks are pressed to form indentations, and the spokes are not affected by the straight edges of the two ends connected to them in sequence Due to the influence of the edge segments and the inner and outer ring edges, after stacking, all single-phase winding disks can truly realize that the spokes are located in the same plane; and after the straight edges of the sector coil units on the stacked disks are pressed, the plane where each spoke pair is located is parallel to the plane where the single-phase winding disk is located, so the width of a single spoke does not affect the flatness of all the spokes of the stacked disk, and thus the winding structure of the sector coil unit of the single-phase winding disk is not restricted. In particular, in this case, the sector coil unit can be a vortex winding structure of a single coil on the sector plane, and finally there is no iron core. The thickness of the effective area of the stator is only the thickness of a single wire, which greatly reduces the thickness of the coreless stator, shortens the magnetic path passing through the coreless stator, and improves the motor efficiency. At the same time, the motor body is small and light. The thickness of a single wire allows it to replace a PCB board motor. Even compared with a PCB board motor, its physical state is more stable, the deformation caused by heat during operation is smaller, the structure is easier to produce, the quality is easier to control, and the cost is lower. In addition, in the coreless stator and motor, the windings in the sector coil unit of the single-phase winding disk are fixed, and the integrity is good and the strength is high.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a first embodiment of an iron-coreless stator according to the present invention;

FIG2 is a schematic diagram of the assembly structure of a first embodiment of the coreless stator of the present invention;

3 is a schematic structural diagram of the straight sides of the sector coil units on the stacked disks of the first embodiment of the coreless stator of the present invention;

FIG4 is a schematic structural diagram of a sector coil unit of a first embodiment of a coreless stator according to the present invention;

FIG5 is a schematic diagram of the assembly structure of a second embodiment of the coreless stator of the present invention;

FIG6 is a schematic diagram of the assembly structure of a third embodiment of the coreless stator of the present invention;

7 is a schematic structural diagram of the straight sides of the sector coil units on the stacked disks of the third embodiment of the coreless stator of the present invention;

FIG8 is a schematic structural diagram of an ironless motor according to the present invention;

FIG9 is a cross-sectional view of the coreless motor of the present invention;

FIG10 is a schematic diagram of the upper structure of the upper and lower symmetrical structure of FIG9;

FIG11 is a schematic diagram of the assembly structure of the ironless motor of the present invention without the bearing assembly bolts;

FIG. 12 is a schematic diagram of the structure when a plurality of coreless motors are stacked for use.

DETAILED DESCRIPTION

1 to 4 disclose a first embodiment of the ironless stator of the present invention.

As shown in FIGS. 1 to 4 , a coreless stator comprises three annular spoke-shaped single-phase winding disks, one of which is used as a reference disk 1, and the other single-phase winding disks are used as stacked disks 1′, the single-phase winding disks comprising a plurality of sector coil units (10, 10′) uniformly distributed and connected along the circumferential direction, the two arc edges of the plurality of sector coil units (10, 10′) of the single-phase winding disks respectively forming inner and outer annular edges ((12, 12′), (13, 13′)), the three single-phase winding disks are coaxial and uniformly staggered and stacked in the circumferential direction, and the sector coil units 10′ on the stacked disk 1′ are uniformly distributed and connected along the circumferential direction. The two ends of the straight edge are axially bent away from the reference disk 1 to form a U shape, and the straight edges of the sector coil units (10, 10') on the three single-phase winding disks form spokes (11, 11') of the corresponding single-phase winding disks along the radial direction section. From the two sides of the reference disk 1 to the outside, the lengths (R, R') of the spokes (11, 11') of the single-phase winding disks decrease successively, and the spokes 11' of the two stacked disks 1' are located between the inner and outer annular edges ((12, 12'), (13, 13')) of the single-phase winding disks adjacent to the reference disk 1 side, and the spokes (11, 11') of the three single-phase winding disks are located in the same plane.

As shown in FIG4 , the sector coil unit (10, 10') of the single-phase winding disk is a vortex winding structure of a single coil on a sector plane. In this way, the coreless stator formed by a plurality of stacked single-phase winding disks has a thickness of only a single wire in the final effective section, which greatly reduces the thickness of the coreless stator, shortens the magnetic path passing through the coreless stator, improves the motor efficiency, and at the same time, makes the motor body small and light.

In a first embodiment of the coreless stator of the present invention, a single wire is wound into a sector-shaped coil unit (10, 10'), and after the sector-shaped coil unit (10, 10') is formed, the internal wire layers are fixed; then, a plurality of sector-shaped coil units (10, 10') thus formed are evenly distributed circumferentially to form a single-phase winding disk, and then both ends of the straight sides of all the sector-shaped coil units 10' on the stacked disk 1' are axially bent into a U shape. Before and after the bending into the U shape, the change requirement of the circumference of the inner ring edge 12' of the stacked disk can generally be achieved by leaving gaps between adjacent sector-shaped coil units 10', or by mutual conversion of the two arc sides of the sector-shaped coil unit 10' and the two straight side sections corresponding to the U-shaped side parts, etc., and the outer side of the stacked disk The change in the circumference of the ring edge 13' is required to be achieved by reserving gaps between adjacent sector coil units 10', or by converting the two arc edges of the sector coil unit 10' into two straight edge sections corresponding to the U-shaped side parts, or by deforming the two arc edges of the sector coil unit 10' along the radial bending of the stacked disks, that is, by the above-mentioned methods, the circumference of the inner ring edge 12' is increased and the circumference of the outer ring edge 13' is decreased before and after bending; then all the single-phase winding disks are coaxially and circumferentially stacked uniformly, and when stacked, the two sides of the reference disk 1 are successively outward, and the lengths (R, R') of the spokes (11, 11') of the single-phase winding disks are successively reduced, and the spokes (11, 11') of all the single-phase winding disks are located in the same plane.

Fig. 5 discloses a second embodiment of the coreless stator of the present invention. As shown in Fig. 5, in the second embodiment, the number of single-phase winding discs is more than three. The rest of the structure is the same as the first embodiment.

FIG6 and FIG7 disclose a third embodiment of the coreless stator of the present invention. As shown in FIG6 and FIG7, in the third embodiment, the stacked disc 1' is connected to the spokes 11' at both ends, and the two straight side sections corresponding to the U-shaped side portions are bent radially outwards respectively. The rest of the structure is the same as the first embodiment.

In actual production, the stacked disk 1' composed of the sector coil units 10', before and after it is bent into a U-shape, the change requirement of the circumference of the inner ring edge 12' can generally be achieved by leaving a gap between adjacent sector coil units 10', or by converting the two arc edges of the sector coil unit 10' into two straight side sections corresponding to the U-shaped side, etc. The change requirement of the circumference of the outer ring edge 13' can be achieved by reserving a gap between adjacent sector coil units 10', or by converting the two arc edges of the sector coil unit 10' into two straight side sections corresponding to the U-shaped side, or by deforming the two arc edges of the sector coil unit 10' along the radial bending of the stacked disk, etc. Of course, before and after the bending, the smaller the change in the circumference of the inner and outer ring edges (12', 13'), the easier it is to achieve through the above method, that is, the more convenient it is to press and bend the stacked disk 1'. Therefore, in the third embodiment of the coreless stator of the present invention, the two straight side sections of the stacked disc 1' connected to the two ends of the spoke 11' and corresponding to the U-shaped side are bent radially outward respectively. On the one hand, the change amount of the inner and outer ring edges (12', 13') of the stacked disc 1' before and after the bending is reduced, so that the stacked disc 1' can more easily meet the molding requirements; on the other hand, the inner and outer ring edges (12', 13') of the stacked disc 1' are parallel to the plane where the single-phase winding disc is located. When the width of the inner and outer ring edges (12', 13') is large, the thickness of the coreless stator can be greatly reduced, and the bending indentation makes the strength of the stacked disc 1' stronger.

The coreless stator of the present invention is formed into a U-shape with straight sides by axially bending the two ends of the straight sides of all the sector coil units 10' on the stacked disk 1'. At the same time, when bending, the change requirement of the circumference of the inner ring edge 12' of the stacked disk 1' can generally be achieved by leaving a gap between adjacent sector coil units 10', or by converting the two arc sides of the sector coil unit 10' with the two straight side sections corresponding to the U-shaped side, and the change requirement of the circumference of the outer ring edge 13' can be achieved by reserving a gap between adjacent sector coil units 10', or by converting the two arc sides of the sector coil unit 10' with the two straight side sections corresponding to the U-shaped side, or by deforming the two arc sides of the sector coil unit 10' along the radial bending of the stacked disk, that is, the enlargement of the circumference of the inner ring edge 12' before and after bending and the enlargement of the outer ring edge 13' can be achieved by the above-mentioned method. The circumference of the ring edge 13' becomes smaller, and the lengths (R, R') of the spokes (11, 11') of all the single-phase winding disks are reduced in sequence from the two sides of the reference disk 1 to the outside, so that the spokes 11' of the stacked disk 1' are axially misaligned with the inner and outer ring edges (12', 13') at both ends thereof, and after being evenly staggered and stacked, the spokes (11, 11') of all the single-phase winding disks can be located in the same plane; in the coreless stator, the straight edges of the sector coil unit 10' on the stacked disk 1' form indentations due to pressing, and the spokes 11' are not affected by the straight edge segments sequentially connected to them at both ends and the inner and outer ring edges (12', 13') ’), after stacking, all single-phase winding disks can truly realize that the spokes (11, 11’) are located in the same plane; and after the straight edge of the sector coil unit 10’ on the stacked disk 1’ is pressed, the plane where each spoke 11’ is located is parallel to the plane where the single-phase winding disk is located, so the width of a single spoke 11’ does not affect the flatness of all spokes 11’ of the stacked disk 1’, and thus the winding structure of the sector coil unit (10, 10’) of the single-phase winding disk is not restricted. In particular, in this case, the sector coil unit (10, 10’) can be a single coil on the sector plane. The vortex winding structure finally has a thickness of only a single wire in the effective area of the coreless stator, which greatly reduces the thickness of the coreless stator, shortens the magnetic path passing through the coreless stator, and improves the motor efficiency. At the same time, the motor body is small and light, and the thickness of a single wire allows it to replace a PCB board motor. Even compared with a PCB board motor, its physical state is more stable, the deformation caused by heat during operation is smaller, the structure is easier to produce, the quality is easier to control, and the cost is lower. In addition, in the coreless stator, the internal wire layers of the sector coil unit (10, 10') of the single-phase winding disk are fixed in sequence, and its integrity is good and the strength is high.

The present invention has a coreless stator, and the number of single-phase winding disks is determined according to application requirements to obtain a motor with a corresponding number of phases; the gaps between two adjacent spokes (11, 11') in the same plane of all single-phase winding disks can also be filled with high-temperature resistant materials to enhance the strength of the single-phase winding disks without causing deformation due to heat.

In the coreless stator of the present invention, the reference disk 1 can be a planar structure, in which case the straight sides of the sector coil unit 10 are the spokes 11; the reference disk 1 can also be a structure bent into a U shape like the stacked disk 1', in which case the bottom side of the U shape is the spokes 11. Preferably, the reference disk 1 is a planar structure, and the thickness of the end of the reference disk of the planar structure is thinner than that of the structure bent into a U shape.

In the coreless stator of the present invention, the stacked disk 1' is pressed and formed. In actual production, it is mostly formed by pressing a plurality of sector coil units 10' to form a single-phase winding disk at one time. However, a single sector coil unit 10' can also be pressed first, and then a plurality of pressed sector coil units 10' are formed into a stacked disk 1'.

The invention also provides an iron-coreless motor.

As shown in FIGS. 8 to 11 , an ironless motor comprises an ironless stator 100 of the present invention, a magnetic steel rotor assembly 2 and a motor shaft 3. The ironless stator 100 is fixedly mounted in a winding fixing support frame 4. The winding fixing support frame 4 is mounted on the motor shaft 3 through a bearing assembly 5. The magnetic steel rotor assembly comprises a rotor disk 21 and a plurality of magnetic steels 22 distributed on the inner wall of the rotor disk 21. The magnetic steel rotor assembly 2 is coaxially arranged on the side of the ironless stator of the present invention. The rotor disk 21 is fixedly connected to the motor shaft 3. The radial length S of the magnetic steel 22 is less than the minimum value of the length R of all single-phase winding disk spokes (11, 11') of the ironless stator, and the magnetic steel 22 corresponds to the position of the spoke (11, 11') with the minimum length R.

As shown in Fig. 10, the shape of the magnetic steel 22 is a fan-shaped structure centered on the motor shaft 3. Compared with rectangular, circular and other structures, the fan-shaped magnetic steel 22 can generate a larger magnetic field area, thereby obtaining a motor with greater power.

As shown in Fig. 9 to Fig. 11, the winding fixed support frame 4 includes two fixed end covers 41, and the inner side of the fixed end covers 41 is provided with a plurality of annular grooves 411 corresponding to the positions of the inner and outer ring edges ((12, 12'), (13, 13')) of the single-phase winding disk of the coreless stator of the present invention. The inner and outer ring edges ((12, 12'), (13, 13')) of all single-phase winding disks are respectively located in the annular grooves 411 corresponding to their positions, and the two fixed end covers 41 are assembled and fixedly connected. The fixed support frame 4 composed of the two fixed end covers 41 has a firm structure, and when the coreless stator of the present invention is fixedly installed in the winding fixed support frame 4, it is only necessary to insert the inner and outer ring edges ((12, 12'), (13, 13')) of each single-phase winding disk into the corresponding annular grooves 411, and the assembly relationship is simple.

As shown in FIG9 and FIG10 , the winding fixing support frame 4 has a wall groove 42 , and the wall groove 42 of the winding fixing support frame 4 is filled with a solidifying material 43 , so as to make the winding fixing support frame 4 stronger without deformation, thereby avoiding friction with the magnetic steel 22 .

As shown in Figures 9 to 11, there are two magnetic steel rotor assemblies 2, and the two magnetic steel rotor assemblies 2 are respectively distributed on both sides of the coreless stator of the present invention. The two magnetic steel rotor assemblies 2 work together to form a magnetic field, which is stronger than the magnetic field of a single magnetic steel rotor assembly 2 on one side, and the motor power obtained is greater.

As shown in FIG11 , the rotor disk 21 is provided with an air inlet 211 and a plurality of partitions 212 located at the air inlet 211. The rotor disk 21 is used to fix the magnetic steel 22 on the one hand, and on the other hand, drives the partitions 212 during the rotation process to form wind, which enters the motor from the air inlet 211 to dissipate heat from the motor. The structure is simple, and the heat dissipation structure is integrated, so that the motor does not need to be equipped with an additional heat dissipation structure, and the motor volume is smaller.

As shown in Figures 9 to 11, the bearing assembly 5 includes a bearing chamber 51, a bearing 52 installed in the bearing chamber 51 and sleeved on the motor shaft 3, a cover plate 53 and a bolt 54. The bearing chamber 51 includes a first part 511 and a second part 512 axially spaced and parallel. The inner edge of the winding fixing support frame 4 is located in the gap between the first part 511 and the second part 512. The outer sides of the first part 511 and the second part 512 are respectively provided with a cover plate 53 located on the outer side of the bearing 52. The inner diameter L of the cover plate 53 is larger than the outer diameter M of the inner ring of the bearing 52 and smaller than the outer diameter N of the outer ring of the bearing 52. The bolt 54 passes through one side cover plate 53, the first part 511 of the bearing chamber, the winding fixing support frame 4, the second part 512 of the bearing chamber and the other side cover plate 53 in sequence to lock the cover plate 53, the bearing chamber 51 and the winding fixing support frame 4. The inner diameter L of the cover plate 53 is larger than the outer diameter M of the inner ring of the bearing 52 and smaller than the outer diameter N of the outer ring of the bearing 52. After being locked by the bolts 54, the two cover plates 53 can play an axial limiting role to prevent the first part 511, the second part 512 and the winding fixing support frame 4 located therebetween from axial movement, and the bearing 52 is covered to prevent the ash tip from damaging the bearing 52. With this arrangement, the inner wall area of the winding fixing support frame 4 is smaller. In this way, the winding fixing support frame 4 is locked to the bearing chamber 51 by the cover plate 53 and the bolts 54. Compared with the structure in which the winding fixing support frame 4 is directly fixed to the bearing 52, it is more stable, firm and reliable.

In the coreless motor of the present invention, the radial length S of the magnetic steel 22 is less than the minimum value of the length R of all the spokes (11, 11') of the single-phase winding disk of the coreless stator, and the magnetic steel 22 corresponds to the position of the spokes (11, 11') with the minimum length R, so that the effective length of the spokes on all the single-phase winding disks cutting the magnetic flux lines is the same, so that a multi-phase motor can be formed. The coreless motor of the present invention can be used alone, or a plurality of them can be used together in stacking according to the power required by the application, as shown in FIG12.

Claims (12)

1. A coreless stator characterized by: the single-phase winding coil comprises a plurality of annular spoke-shaped single-phase winding coils, wherein one single-phase winding coil is used as a reference coil, the rest single-phase winding coils are used as stacked coils, each single-phase winding coil comprises a plurality of fan-shaped coil units which are uniformly distributed along the circumferential direction and are connected, two arc edges of the fan-shaped coil units of each single-phase winding coil form an inner ring edge and an outer ring edge respectively, the single-phase winding coils are coaxial and are uniformly stacked in the circumferential direction in sequence, the straight edges of all the fan-shaped coil units on the stacked coils are bent to be U-shaped in an axial direction back to the side of the reference coil, straight edges of all the fan-shaped coil units on the single-phase winding coils extend along the radial direction to form spokes of the single-phase winding coil, the lengths of the spokes of all the single-phase winding coils are sequentially reduced from the two sides of the reference coil, the spokes of the stacked coils are positioned between the inner ring edge and the outer ring edge of the adjacent single-phase winding coils close to the side of the reference coil, and all the single-phase winding coil spokes are positioned on the same plane.

2. The coreless stator of claim 1, wherein: the fan-shaped coil unit of the single-phase winding disc is a winding structure of a single coil on a fan-shaped plane.

3. The coreless stator of claim 1, wherein: the two straight edge sections of the stacking disc, which are connected with the two ends of the spoke and correspond to the U-shaped side parts, are respectively bent outwards along the radial direction.

4. The coreless stator of claim 1, wherein: the reference disc has a planar structure, i.e. the straight edges of the fan-shaped coil units are spokes.

5. The coreless stator of claim 1, wherein: the circumference of the inner ring of the stacked disc is changed by any one of the modes of reserving gaps of adjacent fan-shaped coil units or mutually converting two arc edges of the fan-shaped coil units and two straight edge sections corresponding to U-shaped side parts, and the circumference of the outer ring of the stacked disc is changed by any one of the modes of reserving gaps of the adjacent fan-shaped coil units or mutually converting two arc edges of the fan-shaped coil units and two straight edge sections corresponding to U-shaped side parts, or radially bending and deforming the stacked disc at the two arc edges of the fan-shaped coil units.

6. A coreless motor, characterized by: the stator without iron core, the magnetic steel rotor assembly and the motor rotating shaft of any one of claims 1 to 5 are included, the stator without iron core is fixedly installed in a winding fixing support frame, the winding fixing support frame is installed on the motor rotating shaft through a bearing assembly, the magnetic steel rotor assembly comprises a rotor disc and a plurality of magnetic steels distributed on the inner wall of the rotor disc, the magnetic steel rotor assembly is coaxially arranged on the side part of the stator without iron core, the rotor disc is fixedly connected with the motor rotating shaft, the radial length of the magnetic steel is smaller than the minimum value of the spoke lengths of all single-phase winding discs of the stator without iron core, and the magnetic steel corresponds to the spoke position with the minimum length.

7. The coreless motor of claim 6, wherein: the shape of the magnetic steel is a fan-shaped structure taking a motor rotating shaft as the center.

8. The coreless motor of claim 6, wherein: the winding fixing support frame comprises two fixing end covers, a plurality of annular grooves corresponding to the positions of the inner ring edge and the outer ring edge of the coreless stator single-phase winding disc are arranged on the inner side of the fixing end cover, the inner ring edge and the outer ring edge of all the single-phase winding discs are respectively positioned in the annular grooves corresponding to the positions of the inner ring edge and the outer ring edge, and the two fixing end covers are fixedly connected in an assembling mode.

9. The coreless motor of claim 6, wherein: the winding fixed support frame is provided with a wall groove, and the wall groove of the winding fixed support frame is filled with a curing material.

10. The coreless motor of claim 6, wherein: the number of the magnetic steel rotor components is two, and the two magnetic steel rotor components are respectively distributed on two sides of the coreless stator.

11. The coreless motor of claim 6, wherein: the rotor disk is provided with an air inlet and a plurality of partition boards positioned at the air inlet.

12. The coreless motor of claim 6, wherein: the bearing assembly comprises a bearing chamber, a bearing, a cover plate and a bolt, wherein the bearing, the cover plate and the bolt are installed in the bearing chamber and are sleeved and fixed on a motor rotating shaft, the bearing chamber comprises a first part and a second part which are axially arranged at intervals, the inner side of a winding fixing support frame is positioned in a gap between the first part and the second part, the outer sides of the first part and the second part are respectively provided with a cover plate positioned on the outer side of the bearing, the inner diameter of the cover plate is larger than the outer diameter of an inner ring of the bearing and smaller than the outer diameter of an outer ring of the bearing, and the bolt sequentially penetrates through one side cover plate, the first part of the bearing chamber, the winding fixing support frame, the second part of the bearing chamber and the cover plate on the other side to fix the cover plate, the bearing chamber and the winding fixing support frame.