CN218243144U - Low-power disc type motor stator and disc type motor - Google Patents

Abstract

The utility model provides a miniwatt disk motor stator, form the integral stator core by the concatenation of second core portion and first core portion, before the concatenation firstly embolias the tooth portion of second core portion or first core portion with the coil assembly of winding well, the winding coil unloading is simple; the stator assembly formed after splicing is used as an insert for injection molding, a plastic enclosure is formed on the outer surfaces of the iron core and the coil assembly, the first iron core part and the second iron core part are limited to be tightly attached in an axial displacement mode, the plastic enclosure has an inverted buckle structure, steel layers of the iron core cannot be layered and dislocated, and the stator iron core has good magnetic conductivity; after plastic packaging, a notch is formed between the adjacent pole shoe parts of the second iron core part to form a small-power disc type motor stator, and a motor using the stator has better electromagnetic performance. Furthermore, the utility model also provides a disk motor.

Description

Low-power disc type motor stator and disc type motor

Technical Field

The utility model relates to a miniwatt disc motor stator and disc motor, IPC classification can be H02K 1/14, H02K1/16, H02K 1/26, H02K 1/27.

Background

In the prior art, an iron core of a low-power disc type motor is generally realized by a strip steel strip winding mode, a stator iron core is provided with a yoke part, and in order to achieve better electromagnetic performance, the stator iron core is generally designed into a semi-open slot structure, so that a plurality of difficulties are increased for winding inserting.

Chinese patent application CN110474452A discloses a disc-type motor core, in which a first core tooth portion and a second core tooth portion are spliced together to form a core tooth for mounting a coil, so that the coil can be embedded in a coil slot between the independent first core tooth portion and the independent second core tooth portion, which is convenient for winding inserting and reduces the assembly difficulty of the coil.

When the disc type motor operates, a stator core can be subjected to tangential torque and axial magnetic tension generated by a permanent magnet on a rotor to the stator, the stator core is made of thin steel strips through winding or laminating, the steel strip layers can generate axial displacement towards the rotor direction through the axial magnetic tension, the stator core is layered, gaps can be generated between two core tooth parts which are axially attached to each other, the magnetic conductivity of the stator is influenced, the gaps between the rotor and the stator core can be reduced, and the stator and the rotor have a friction fault phenomenon.

To sum up, how to design a disk motor stator, it had both had the half-closed slot structure, was convenient for the winding to roll off the production line again, and its stator core and iron core steel tape layer can also obtain reliable axial spacing moreover, avoids taking place the dislocation phenomenon between the layer, guarantees stator core's good magnetic conductivity, is the problem that the skilled person in the art needs a urgent need to solve.

Other related terms and common knowledge can be found in the mechanical engineering handbook and the motor engineering handbook (draft group, 2 nd edition of mechanical industry press 1997), the Chinese national standard GB/T2900.25-2008 the electrical term rotating motor, the Chinese patent application CN110474452A of disc type iron core and disc type motor with publication date of 2019, 11 and 11, and the Chinese patent CN214850918U of disc type permanent magnet motor with publication date of 2021, 11 and 23.

Disclosure of Invention

The utility model aims at providing a miniwatt disk motor stator in order to solve the problem that exists among the prior art, include: the coil assembly comprises a coil framework and coils wound in the middle section of the coil framework, the center of the coil framework is provided with a through hole which is axially communicated, the iron core comprises a first iron core part and a second iron core part, the first iron core part is formed by winding a strip-shaped steel strip and comprises an annular yoke part and a plurality of first tooth parts which are uniformly distributed along the circumferential direction and protrude from the upper end surface of the annular yoke part; second iron-core portion includes the second tooth portion and in the utmost point boots portion that second tooth portion upper end circumference both sides widen formation, second tooth portion and the laminating of first tooth portion axial, coil skeleton's through-hole cover is located on first tooth portion or/and the second tooth portion, the circumference side of utmost point boots portion is equipped with the sunk structure to utmost point boots portion center direction constriction, disc motor stator still including mould plastics form in the nevertheless expose of iron core and coil pack surface the plastic envelope shell of second iron-core portion up end, the plastic envelope shell has the back-off structure of moulding plastics formation between the adjacent pole shoe portion of circumference.

According to the small-power disc type motor stator, the second iron core part and the first iron core part are spliced to form an integral stator iron core, before splicing, the coil assembly wound with the coil is sleeved into the second iron core part or the tooth part of the first iron core part, and the winding is simple to coil off; the stator assembly formed after splicing is used as an insert for injection molding, a plastic enclosure is formed on the outer surfaces of the iron core and the coil assembly, the first iron core part and the second iron core part are limited to be tightly attached in an axial displacement mode, the plastic enclosure has an inverted buckle structure, steel layers of the iron core cannot be layered and dislocated, and the stator iron core has good magnetic conductivity; and after plastic packaging, cutting a connecting part between adjacent pole shoe parts of the second core part into a closed slot magnetic bridge with proper thickness along the radial direction, or cutting the connecting part into a slot with a semi-open slot with proper width formed by a gap, thereby forming the small-power disc type motor stator. The motor using the stator has better electromagnetic performance. The formation of the suitable magnetic bridge or gap is a final cutting process structure, and the influence of insufficient mechanical strength on processing caused by the fact that the second iron core part winding punching sheet is too narrow in the initial stage at the connecting part between the adjacent pole shoe parts is avoided.

Preferably, the second core part is formed by winding a strip steel strip, an annular connecting part is further formed at the upper end of the pole shoe part, the annular connecting part is exposed out of the plastic casing, and a gap or a magnetic bridge with reduced thickness is radially arranged between circumferentially adjacent pole shoe parts of the annular connecting part. The second core part is formed by winding a strip steel belt into an integral structure, is simple to assemble with the coil assembly, saves assembly time and is beneficial to automatic production.

Furthermore, the thickness of the magnetic bridge is not more than 0.2mm, and the closed slot structure of the magnetic bridge with proper thickness is more favorable for improving the adverse effect and appearance of the tooth harmonic wave.

Furthermore, the thickness of the annular connecting part is smaller than 2mm, so that the subsequent cutting process is facilitated.

Preferably, the width t1 of the gap is equal to the distance t2 between circumferentially adjacent pole shoes.

The width of the slot formed by the gap is equal to the width of the slot formed between adjacent pole shoes, which is beneficial to reducing the pulsating electromagnetic wave of the motor.

Furthermore, the utility model also provides a disc motor, including disc rotor and the above-mentioned arbitrary disc motor stator.

Drawings

Fig. 1 is a schematic structural view of a stator assembly before plastic package according to embodiment 1 of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is an enlarged view of one of the pole shoe portion structures of the second core portion according to the embodiment of the present invention.

Fig. 4 is an enlarged view of a second pole shoe portion structure of the second core portion according to the embodiment of the present invention.

Fig. 5 is an enlarged view of a third pole shoe portion structure of the second core portion according to the embodiment of the present invention.

Fig. 6 is a radial cross-sectional view of the post-plastic-package stator assembly according to embodiment 1 of the present invention.

Fig. 7 is a circumferential partial cross-sectional view illustrating a stator assembly after plastic package according to embodiment 1 of the present invention.

Fig. 8 is a partially enlarged view of fig. 7.

Fig. 9 is a schematic structural diagram illustrating a stator of a low-power disc motor according to embodiment 1 of the present invention.

Fig. 10 is an exploded view of a stator assembly before plastic packaging according to embodiment 2 of the present invention.

Fig. 11 is a schematic structural view of a stator assembly before plastic package according to embodiment 2 of the present invention.

Fig. 12 is a schematic structural view of a stator of a low-power disc motor according to embodiment 2 of the present invention.

Fig. 13 is a schematic structural diagram of an embodiment of the disc motor of the present invention.

Reference numerals:

the core comprises a core 10, a first core part 101, an annular yoke part 1011, a first tooth part 1012, a second core part 102, an annular connecting part 1021, a pole shoe part 1022, a second tooth part 1023, a concave structure 1024, a gap 1025, a coil assembly 20, a coil skeleton 201, a through hole 2011, a pre-mold stator assembly 1020, a mold casing 30, a back-off structure 301, a bottom 302, an outer peripheral part 303, an inner peripheral part 304, a socket part 305, a disc-type motor stator 100 and a disc-type rotor 200.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In describing the apparatus, system, device, and structure of the present invention, the tooth notch is used as the upper side or upper side, and the iron core yoke is used as the lower side or lower side. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific embodiments.

Example 1

As shown in fig. 1 to 9, the disc motor stator of this embodiment includes a core 10, a coil assembly 20, and a plastic shell 30 formed on outer surfaces of the core 10 and the coil assembly 20. As shown in fig. 1 and 2, the iron core 10 is formed by splicing a first iron core portion 101 and a second iron core portion 102, the first iron core portion 101 is formed by winding a steel strip formed by stamping, and includes an annular yoke portion 1011 formed at a lower section thereof and a plurality of first tooth portions 1012 protruding upwards at an upper end of the annular yoke portion 1011 and uniformly distributed along a circumferential direction, preferably, a radial cross section of each first tooth portion 1012 is a sector concentric with the annular yoke portion; the second core portion 102 is formed by winding a steel strip formed by stamping, and includes an annular connecting portion 1021 formed at an upper section thereof, a plurality of circumferentially uniformly distributed pole shoe portions 1022 protruding downward from a lower end surface of the annular connecting portion, and a second tooth portion 1023 protruding downward from a center of the pole shoe portion 1022, wherein a recessed structure 1024 with a narrowed circumferential width is arranged on a circumferential side surface of the pole shoe portion 1022, and the circumferential width of the second tooth portion 1023 is smaller than the circumferential width of the pole shoe portion 1022. Preferably, the radial section of the second tooth 1023 is sector concentric to the annular connection 1021 and is identical to the radial section of the first tooth 1012.

The concave structure 1024 arranged on the circumferential side surface of the pole shoe part 1022 is an inclined surface inclined from bottom to top toward the center of the pole shoe part 1022 as shown in fig. 3; or as shown in fig. 4, the concave structure 1024 arranged on the circumferential side surface of the pole shoe part 1022 is a groove concave in the middle section of the side surface; alternatively, as shown in fig. 5, the recessed structure 1024 provided on the circumferential side surface of the pole shoe portion 1022 is a step recessed toward the center of the pole shoe portion 1022 at the upper section of the side surface.

As shown in fig. 2, the coil assembly 20 includes a cylindrical bobbin 201 and a coil 202 wound around a middle section of an outer surface of the bobbin 201, the bobbin 201 is generally formed by injection molding of an insulating material, and has a structure in which two ends of the bobbin are protruded and the middle section of the bobbin is recessed, so that the coil 202 wound around the middle section can be limited, and a through hole 2011 is provided at a center of the bobbin 201.

As shown in fig. 1, the pre-mold package stator assembly 1020 includes a coil assembly 20 and an iron core 10, the iron core includes a first iron core portion 101 and a second iron core portion 102, wherein a second tooth portion 1023 of the second iron core portion abuts against a first tooth portion 1012 of the first iron core portion to form a tooth portion of the iron core 10, and the coil assembly 20 is sleeved on the tooth portion of the iron core 10.

As shown in fig. 6 to 8, the plastic package housing 30 is formed by injection molding with the pre-plastic package stator assembly 1020 as an insert, during injection molding, a mold (not shown) compresses the first core portion 101 and the second core portion 101, so that the first core portion 101 and the second core portion 102 are tightly attached to each other, the back-off structure 301 is formed between circumferentially adjacent pole shoe portions 1022 of the plastic package housing 30, and the back-off structure 301 is formed by filling a space between adjacent concave structures 1024 with plastic during injection molding; preferably, the plastic package case 30 includes: a bottom portion 302 covering the annular yoke portion 1011 of the first core portion from the lower side; an outer circumferential portion 303 and an inner circumferential portion 304 extending upward from the bottom portion and covering the coil 202 and the bobbin 201; and a coil block external power supply portion 304 protruding from the cylindrical portion to the outer circumferential side; the mold case 30 covers the remaining portion of the core 10 except the annular connection portion 1021 of the second core portion.

As shown in fig. 9, a gap 1025 is provided in a region between circumferentially adjacent pole shoe portions 1022 of the second core portion to radially cut the annular connection portion 1021, so as to form the small power disc motor stator 100, where the thickness of the annular connection portion 1021 is not greater than 2mm for easy cutting; or a magnetic bridge with proper thickness between adjacent teeth is formed by cutting the annular connecting part 1021 along the radial direction to be thin and thick in the area between the circumferentially adjacent pole shoe parts 1022 of the second core part, and the thickness of the magnetic bridge is preferably not more than 0.2mm, so that the stator is the small-power disc type motor stator 100 with a closed slot structure. The circumferential width t1 of the magnetic bridge or gap 1025 is equal to the distance t2 between the adjacent pole shoe parts 1022, so that the width of the notch formed by cutting is consistent with that of the notch formed between the adjacent pole shoe parts 1022, and the reduction of the pulsating electromagnetic wave is facilitated. For specific products, better-effect shapes and sizes can be obtained through electromagnetic calculation, experiments and simulation. The closed slot structure of the magnetic bridge with proper thickness is more favorable for improving the adverse effect and appearance of the tooth harmonic wave.

Preferably, the plastic package housing 30 is formed of Bulk Molding Compound (BMC). In the present embodiment, the pre-mold stator assembly 1020 is placed in a mold, and a BMC resin is injected into the mold and cured to form the mold package 30.

Example 2

The present embodiment provides a small-power disc-type motor stator, which is different from embodiment 1 in that:

as shown in fig. 10, the second core portion of this embodiment is composed of a plurality of separated "T-shaped" cores formed by laminating stamped steel sheets, the "T-shaped" cores include a pole shoe portion 1022 and a second tooth portion 1023 protruding downward from the center of the pole shoe portion 1022, and the structures of the pole shoe portion 1022 and the second tooth portion 1023 are the same as those of embodiment 1, and are not described again.

As shown in fig. 11, in the stator assembly before mold-molding 1020 of the present embodiment, the second tooth portions 1023 of the plurality of separated "T-shaped" cores are inserted into the through holes 2011 of the corresponding coil bobbins, and are all abutted against the first tooth portions 1012 of the first core portion.

As shown in fig. 12, in the present embodiment, the undercut structure 301 formed by injection molding in the region between the circumferentially adjacent pole shoe portions 1022 of the second core portion functions as a half-open slot structure similar to the gap 1025 of embodiment 1, thereby saving the notching process after the core is plastically molded.

Example 3

The present embodiment provides a disk motor, as shown in fig. 13, including a rotor 200 and a small-power disk motor stator 100 as described in any one of the above, where the stator 100 and the rotor 200 are arranged in an up-and-down manner to form axial magnetic coupling.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention, e.g., to reduce reluctance resulting from the air gap length at the interface of first core portion 101 and second core portion 102, the interface may be designed to be non-horizontal (sloped, stepped, curved, etc.) to increase the interface air gap area. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A low-power disc type motor stator (100) comprises an iron core (10) and a coil assembly (20), wherein the coil assembly (20) is composed of a coil framework (201) and coils (202) wound on the middle section of the coil framework, the center of the coil framework (201) is provided with an axially through hole (2011), the iron core (10) comprises a first iron core part (101) and a second iron core part (102), the first iron core part (101) is formed by winding a strip-shaped steel belt and comprises an annular yoke part (1011) and a plurality of first tooth parts (1012) which are protruded on the upper end face of the annular yoke part and are uniformly distributed along the circumferential direction; second iron-core portion includes second tooth portion (1023) and in pole shoe portion (1022) that second tooth portion (1023) upper end circumference both sides widen and form, through-hole (2011) cover of coil skeleton (201) is located on first tooth portion (1012) or/and second tooth portion (1023), second tooth portion (1023) and first tooth portion (1012) axial laminating, its characterized in that, the circumference side of utmost point boots portion (1022) is equipped with to utmost point boots portion central direction constriction's sunk structure (1024), disc motor stator still including mould plastics form in iron core (10) and coil pack (20) surface nevertheless expose outside the plastic envelope shell (30) of second iron-core portion (102 ) up end, it has between adjacent pole shoe portion (1022) of circumference to mould plastics capsule (30) and moulds plastics back-off structure (301) of formation.

2. The small-power disc type motor stator according to claim 1, wherein the second core portion (102) is formed by winding a strip-shaped steel strip, an annular connecting portion (1021) is further disposed at an upper end of the pole shoe portion (1022), an upper end face of the annular connecting portion (105) is exposed out of the plastic casing (30), and a radial gap (1025) or a magnetic bridge with a reduced thickness is disposed between circumferentially adjacent pole shoe portions (1022) in the annular connecting portion (1021).

3. The small power disc motor stator according to claim 2, wherein the thickness of the magnetic bridge is not more than 0.2mm.

4. A low-power disc motor stator according to claim 2, characterized in that the thickness of the annular connection portion (1021) is less than 2mm.

5. The small power disc motor stator according to claim 2, wherein the width t1 of the gap (1025) is equal to the distance t2 between circumferentially adjacent pole shoes (1022).

6. A low power disc motor comprising a disc-shaped rotor (200), characterized by further comprising a low power disc motor stator (100) according to any one of claims 1 to 5.

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