CN111384792B - Axial motor stator and production process thereof - Google Patents

Abstract

The invention provides an axial motor stator and a production process thereof, belongs to the technical field of motor stators, and solves the problems of air gap and poor thermal conductivity between the iron core and the coil winding in the prior art. The present invention includes a casing, an iron core, and a coil winding sleeved on the outside of the iron core. It is characterized in that an iron core sleeve is arranged between the iron core and the coil winding, and the iron core sleeve is made of insulating material. The gap between the casing and the iron core, between the iron core and the coil winding, and between the iron core winding and the casing is filled with potting glue, and the iron core sleeve is provided with a filter for the potting glue to pass through. glue channel. The invention limits the minimum distance between the iron core and the coil winding by arranging the iron core sleeve, and pours the iron core and the coil winding into one body by potting, so as to ensure the potting strength and ensure sufficient insulation thickness between the iron core and the winding. , there is no air gap between the iron core and the coil winding, forming an effective thermal insulation layer, which has the advantages of simple process and cost saving.

Description

Axial motor stator and production process thereof

technical field

The invention belongs to the technical field of motors, and in particular relates to an axial motor stator and a production process.

Background technique

Compared with the traditional radial field motor, the number of coil windings in the disc motor is more, the distribution is more scattered, and the production is more difficult. The traditional winding and embedding process needs to manually insert the pre-wound coils between the teeth of the iron core padded with insulating paper. This process is almost entirely performed by hand, and the production efficiency is low, which is difficult to meet the production of disc motors. need.

In the current research direction, the combined application of the flat copper wire and the open iron core structure can greatly reduce the production difficulty of the coil winding of the disc motor. Specifically, the following steps can be used: manufacturing an iron core with an open structure, winding flat copper wire windings corresponding to the iron core structure, and inserting the flat copper wire windings into the open iron core to obtain the stator structure of the disc motor. In this way, it is still necessary to pad insulating paper between each tooth of the iron core to ensure the insulation strength between the coil and the iron core. However, the insertion of insulating paper has become an important factor hindering the improvement of production efficiency, and at the same time, the insulating paper also reduces the efficiency of heat transfer from the coil winding to the iron core.

In order to solve the above problems, for example, the invention patent with the authorized publication number CN209718404U discloses a manufacturing device for the cladding of a motor iron core, which is provided with a central column, a positioning column and a positioning groove on the bottom plate, and the positioning column and the positioning groove are arranged around the central column. ; Place the mold core that matches the shape of the motor core on the bottom plate, insert the annular wall into the positioning groove, and connect the cover plate to the center column to press and fix the mold core on the positioning column; inject the first liquid through the through hole on the cover plate material until the height of the mold core is equal to the height of the mold core, the gap between the mold core and the bottom plate and the first liquid material filled with the inner wall of the annular wall as the boundary is solidified to form a mold; the motor iron core is fixed on the bottom plate, and the cover plate and the The center column is fixedly connected, the cover plate presses and fixes the mold on the bottom plate, and the motor iron core is formed directly on the motor iron core after injecting the second liquid material into the gap between the mold and the motor iron core through the through hole in the cover plate cladding.

The above-mentioned patent directly forms a cladding layer on the iron core through a mold. Although the prior art solves the problem of inconvenient operation that requires insulating paper to be placed between the teeth of each iron core, the process also has the problem of inconvenient operation. In particular, the contact area between the iron core cladding and the mold is large, and the iron core cladding is sticky during the production process, resulting in a large mold opening resistance, and the iron core cladding is easily damaged by force during the mold opening process. In addition, the production of iron core cladding needs to be carried out together with the iron core, which does not conform to the idea of reducing the production cycle in parallel with multiple processes. If the iron core cladding is prepared in advance and then covered on the iron core, on the one hand, the fitting tolerance of the iron core cladding and the multiple contact surfaces of the iron core is difficult to guarantee. The existence of tolerances will lead to the existence of air gaps between the core and the core cladding, the thermal conductivity will be poor, and this structure has the risk of being loose and easily broken.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems existing in the prior art, and propose an axial motor stator with good heat conduction effect and a production process thereof.

The purpose of the present invention can be achieved through the following technical solutions: an axial motor stator, comprising a casing, an iron core, and a coil winding sleeved on the outside of the iron core, characterized in that, between the iron core and the coil winding There is an iron core sleeve body, the iron core sleeve body is made of insulating material, and there are gaps between the casing and the iron core, between the iron core and the coil winding, and between the iron core winding and the casing. Filled with potting glue, the iron core sleeve body is provided with a glue passage for the potting glue to pass through.

The role of the potting compound is to fill the gap between the shell, the iron core, the iron core sleeve and the coil winding to form an integrated body, thereby improving the thermal conductivity and insulation of the stator, as well as the shock resistance of each component. It plays the role of isolating the iron core and the coil winding. The minimum distance between the iron core and the coil winding is limited by setting the iron core sleeve. While ensuring the strength of the glue, there is sufficient insulation thickness between the iron core and the winding to form an effective thermal insulation layer. The potting glue passes through the glue passage on the iron core sleeve and enters the gap between the iron core and the iron core sleeve. inside, to ensure that the potting glue is not blocked by the iron core sleeve when it is filled between the iron core and the coil winding.

In the above-mentioned stator of an axial motor, the iron core sleeve body is made of a potting compound material. The heat conduction and insulation between the iron core and the coil winding are mainly realized by potting glue. The iron core sleeve body is made of materials with high insulation strength and good thermal conductivity, which can further optimize the motor performance. The iron core sleeve body is made of potting glue. The same material is pre-injected and cured. On the one hand, it reduces the cost of purchasing the iron core sleeve material separately. The interface of the potting compound is fused, and due to the high temperature of the motor when the motor is running, the expansion coefficient of the potting compound and the iron core sleeve material is the same, which can prevent the iron core sleeve body and the potting compound from being caused by inconsistent material expansion coefficients. The hidden danger of potting glue cracking when the motor repeatedly has temperature difference.

In the above-mentioned axial motor stator, the iron core sleeve body is in the shape of a mesh, and the glue passage is a mesh hole on the iron core sleeve body.

In the above-mentioned stator of an axial motor, the meshes are in the shape of a rectangle, a honeycomb or a circle.

As another solution, in the above-mentioned axial motor stator, the iron core sleeve body is provided with a plurality of horizontally or longitudinally arranged strip-shaped glue holes, and the glue passage is the iron core sleeve The strip-shaped glue hole on the body.

In the above-mentioned stator of an axial motor, the minimum size of the glue passing channel is 2mm-4mm. In order to ensure the potting efficiency and quality, the minimum glue-passing size of the glue-passing channel should not be too small. If the glue-passing channel is a mesh, the minimum inscribed circle diameter of the mesh should be between 2mm and 4mm. If the glue-passing channel is parallel If the strip-shaped glue hole is used, the minimum interval of the strip-shaped glue hole is between 2mm and 4mm. Too small glue channel is not conducive to the passage of the potting glue, prolonging the time of the whole process and increasing the production cost. The large size of the glue passage is not conducive to the limitation of the minimum distance between the coil winding and the iron core, and it is easy to locally stick too close, which affects the quality of the product.

In the above-mentioned stator of an axial motor, the potting compound is also filled with ceramic balls, and the diameter of the ceramic balls is greater than 5 mm. In order to improve the thermal conductivity and insulation effect of the potting compound, reduce the amount of colloid used to save costs, and at the same time form a certain stress dispersion for the potting compound that is one-piece after potting and improve the toughness of the colloid, so the potting compound is filled with ceramic balls. The outer diameter of the ceramic ball is set to be greater than 5mm to ensure that the ceramic ball is only filled in the large area between the shell and the iron core, and between the shell and the coil winding, so as to prevent the ceramic ball from falling into the glue channel and affecting the irrigation. seal quality.

In the above-mentioned stator of an axial motor, the inner side of the iron core sleeve body is further provided with an isolation column. By setting the isolation column, more gaps are left between the iron core sleeve and the iron core for filling, so as to prevent the iron core and the coil winding from being too close to cause insufficient filling of the colloid, which affects the thermal conductivity and insulation effect. Glue is filled between the core sleeve body and the iron core to prevent the gap between the iron core sleeve body and the iron core from being too small to be filled with potting glue.

In the above-mentioned axial motor stator, the iron core sleeve body includes iron core sleeve body monomers corresponding to the iron cores one-to-one, and the iron core sleeve body monomers are connected as a whole by connecting pieces Mode. The integrated iron core sleeve body is connected by a combination of multiple iron core sleeve bodies, which is more efficient than the split type installation, and at the same time, the processing cost can also be effectively reduced.

In the above-mentioned stator of an axial motor, the coil windings are divided into three groups, which are respectively sleeved on the iron core at intervals to form an upper coil, a middle coil and a lower coil. On the iron core, the upper coil, the middle coil and the lower coil are all sleeved on the single body of the iron core sleeve. The single iron core sleeve body is sleeved on the iron core, and each iron core sleeve body has the same structure, which is convenient for processing.

In the above-mentioned axial motor stator, the single iron core sleeve body includes an upper iron core sleeve body, a middle iron core sleeve body, a lower iron core sleeve body, an upper iron core sleeve body, and a middle iron core sleeve body , The lower iron core sleeves are adjacent in turn and are connected into one piece by connecting pieces, and the heights of the three are gradually decreased, corresponding to the upper coil and the iron core sleeved position, the middle coil and the iron core sleeved position, the lower coil and the iron core respectively. socket location.

The heights of the upper iron core sleeve body, the middle iron core sleeve body and the lower iron core sleeve body are set to decrease in sequence, so as to save materials and reduce costs.

In the above-mentioned axial motor stator, the potting compound is made of materials such as epoxy, polyurethane or silica gel.

Another object of the present invention is to provide a production process of an axial motor stator, comprising the following steps:

S1. Sleeve the iron core sleeve on the iron core, and then sleeve the coil windings on the iron core sleeve in turn;

S2. Use potting glue to cast the iron core, the iron core sleeve and the coil winding into one body;

S3, the potting glue is left to solidify or vacuum heating to solidify.

In the above-mentioned production process of an axial motor stator, the step S2 includes first adding ceramic balls into the casing, and making the ceramic balls evenly distributed between the casing and the iron core, the casing and the coil windings, and then Fill in the encapsulant.

Compared with the prior art, the stator of the axial motor is provided with an iron core sleeve to isolate the iron core and the coil winding, and a glue passage is arranged on the iron core sleeve, so that the shell, iron core, The coil winding is cast into one body to ensure that there is no air gap between the iron core and the coil winding to form an effective thermal insulation layer; the iron core sleeve is made of the same material as the colloid to ensure good interface fusion and expansion after the potting glue is cured. The coefficient is the same; an isolation column can be set to leave more space between the core sleeve and the core to give glue to prevent the insulation effect from being too close to the core and the coil winding; by adding in the potting glue The ceramic ball can improve the thermal conductivity and insulation performance of the potting glue, and at the same time improve the toughness of the potting glue after curing; therefore, the axial motor stator has the advantages of good insulation performance, simple process and cost saving.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of Embodiment 1 of the present invention;

Fig. 2 is the schematic diagram between the iron core and the iron core sleeve according to the second embodiment of the present invention;

Fig. 3 is the three-dimensional structure schematic diagram of Embodiment 3 of the present invention;

Fig. 4 is the schematic diagram after the coil winding of the embodiment 1 of the present invention is assembled;

In the figure, 1, iron core; 2, coil winding; 21, upper coil; 22, middle coil; 23, lower coil; 3, iron core sleeve; 31, iron core sleeve body; 311, upper iron core sleeve 312, the middle iron core sleeve body; 313, the lower iron core sleeve body; 32, the connecting piece; 4, the glue passage; 5, the isolation column.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

Example 1

As shown in Figure 1, the stator of the axial motor includes a casing, an iron core 1, and a coil winding 2 sleeved on the outside of the iron core 1. An iron core sleeve 3 is arranged between the iron core 1 and the coil winding 2. The core sleeve body 3 is made of insulating material, and the gaps between the casing and the iron core 1, between the iron core 1 and the coil winding 2, and between the windings of the iron core 1 and the casing are filled with potting glue, and the iron core sleeve is filled with potting glue. The body 3 is provided with a glue passage 4 for the potting glue to pass through. The iron core sleeve body 3 is made of potting glue material. The iron core sleeve body 3 is in the shape of a mesh, and the glue passage 4 is made of iron The meshes on the core sleeve body 3 may be rectangular, honeycomb-shaped or circular. In this embodiment, the meshes are rectangular.

The function of the potting compound is to fill the gaps between the shell, the iron core 1, the iron core sleeve 3 and the coil winding 2 into one body, so as to improve the thermal conductivity and insulation of the stator and the shock resistance of each component. The core sleeve body 3 plays the role of isolating the iron core 1 and the coil winding 2. The minimum distance between the iron core 1 and the coil winding 2 is limited by setting the iron core sleeve body 3. The winding 2 is poured into one body to ensure sufficient insulation thickness between the iron core 1 and the winding while ensuring the strength of the whole potting compound, so as to form an effective thermal insulation layer. The glue passage 4 enters the gap between the iron core 1 and the iron core sleeve 3 to ensure that the potting glue is not blocked by the iron core sleeve 3 when filling between the iron core 1 and the coil winding 2 . The heat conduction and insulation between the iron core 1 and the coil winding 2 are mainly realized by potting glue. The iron core sleeve body 3 is set to a material with high insulation strength and good thermal conductivity, which can further optimize the motor performance. It is pre-injected and cured by using the same material as the potting compound. On the one hand, it reduces the cost of purchasing the material of the iron core sleeve 3 separately. It is beneficial to the interface fusion between the iron core sleeve 3 and the potting compound, and when the motor is running, due to the high temperature of the motor, the expansion coefficient of the potting compound and the iron core sleeve 3 is the same, which can prevent the iron core sleeve 3 and the potting. Due to the inconsistency of material expansion coefficients between glues, there is a hidden danger of potting glue cracking when the motor repeatedly experiences temperature differences.

In this embodiment, the minimum glue passing size of the glue passing channel 4 is 2mm-4mm. In order to ensure the potting efficiency and quality, the minimum glue-passing size of the glue-passing channel 4 cannot be too small. In this embodiment, the glue-passing channel 4 is a mesh hole, and the minimum inscribed circle diameter of the mesh hole is between 2mm and 4mm. A small glue passage 4 is not conducive to the passage of the potting glue, prolongs the time of the whole process, and increases the production cost. The size of the glue passage 4 that is too large is not conducive to the limitation of the minimum distance between the coil winding 2 and the iron core 1, and is prone to occur. If the parts are too close, the quality of the product will be affected. In addition, in order to improve the thermal conductivity and insulation effect of the potting compound and reduce the usage amount of the colloid to save costs, in this embodiment, the potting compound is also filled with ceramic balls, and the diameter of the ceramic balls is greater than 5 mm. After adding the ceramic ball, the thermal conductivity and insulation effect of the potting compound is improved, and the usage of the potting compound is reduced. The outer diameter of the ball is set to be greater than 5mm, in order to ensure that the ceramic ball is only filled in the large area between the shell and the iron core 1 and between the shell and the coil winding 2, so as to prevent the ceramic ball from sinking into the glue channel 4 and affecting the irrigation. seal quality.

In this embodiment, the iron core sleeve body 3 includes iron core sleeve body cells 31 corresponding to the iron cores 1 one-to-one, and the iron core sleeve body cells 31 are connected in one piece through the connecting piece 32 . . The cross section of the iron core sleeve body 31 is the same as the iron core 1 , the side wall of the iron core sleeve body 31 is provided with the above meshes, and the height of the iron core sleeve body 31 is higher than the height of the coil winding 2 , the iron core sleeve body 3 is connected to the integrated iron core sleeve body 3 through the combination of a plurality of iron core sleeve body monomers 31 , which is more efficient than the split type installation, and at the same time, the processing cost can also be effectively reduced. The potting compound is made of epoxy, polyurethane or silicone materials, the core sleeve 3 is made of the same material as the potting compound, and the ceramic ball is made of high thermal conductivity, high insulation alumina, aluminum nitride, One or more of them are made of diamonds.

Example 2

As shown in FIG. 2 , the structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that the inner side of the iron core sleeve body 3 is also provided with an isolation column. Leave more space between the core 1 and the core 1 for filling to prevent the core 1 and the coil winding 2 from being too close to cause insufficient filling of the colloid, which affects the thermal conductivity and insulation effect. Glue is filled between the cores 1 to prevent the gap between the core sleeve 3 and the core 1 from being too small to be filled with potting glue.

In addition, in this embodiment, the glue-passing channel 4 is a strip-shaped glue-passing hole arranged on the outer side of the iron core sleeve body 3 in parallel, and the minimum interval of the strip-shaped glue-passing hole is between 2mm and 4mm. It is not conducive to the passage of the potting glue, prolongs the time of the whole process, and increases the production cost. The too large size of the glue passage 4 is not conducive to the limitation of the minimum distance between the coil winding 2 and the iron core 1, and it is easy to locally stick too close. affect product quality.

Example 3

As shown in FIG. 3 and FIG. 4 , the structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the coil windings 2 are three sets of coil windings 2 with different heights, which are respectively sleeved on the iron The upper coil 21, the middle coil 22 and the lower coil 23 are formed on the core 1. The iron core sleeve body 31 is sleeved on the iron core 1, and the upper coil 21, the middle coil 22 and the lower coil 23 are sleeved on the iron core 1. on the core sleeve body monomer 31 . The single iron core sleeve body 31 includes an upper iron core sleeve body 311, a middle iron core sleeve body 312, a lower iron core sleeve body 313, an upper iron core sleeve body 311, a middle iron core sleeve body 312, and a lower iron core sleeve body. The bodies 313 are adjacent to each other in sequence and are connected by the connecting piece 32 as a whole, and the heights of the three are decreasing in sequence. 1 socket position, the middle coil 22 is socketed with iron core 1, and the lower coil 23 is socketed with iron core 1. The heights of the upper iron core sleeve body 311 , the middle iron core sleeve body 312 , and the lower iron core sleeve body 313 are set to decrease in sequence, so as to save materials and reduce costs.

The production process of the axial motor stator in the present embodiment 1-3 includes the following steps:

S1. Sleeve the iron core sleeve 3 on the iron core 1, then sleeve the coil winding 2 on the iron core sleeve 3 in turn, and then put the sleeved iron core 1 and coil winding 2 into the motor stator. inside the shell;

S2. First add the ceramic balls into the shell, so that the ceramic balls are evenly distributed between the shell and the iron core 1, the shell and the coil winding 2, and then fill in the potting glue, and wait for the potting glue to penetrate into the shell and the casing. Iron core 1, iron core 1 and winding coil, casing and winding coil, and the gap between iron core 1 and iron core sleeve 3;

S3. The shell after the potting is completed or heated in vacuum to cure the potting.

For the stator of a single-rotor motor, since the casing is in the shape of an annular opening, a coil for accommodating the iron core 1 and the windings is formed in the casing, and potting glue can be directly filled into the casing. Therefore, when pouring glue, it is necessary to seal one side of the shell through the cover plate to form a cavity filled with potting glue, and then remove the cover plate after the potting glue is completely cured.

The stator of the axial motor is provided with an iron core sleeve 3 to isolate the iron core 1 and the coil winding 2, and a glue passage 4 is set on the iron core sleeve 3, so that when the stator is filled with glue, the shell, the iron core 1 and the coil are The winding 2 is cast into one body to ensure that there is no air gap between the iron core 1 and the coil winding 2 to form an effective thermal insulation layer; the iron core sleeve 3 is made of the same material as the colloid to ensure the interface fusion after the potting glue is cured Good, the expansion coefficient is the same; the isolation column can be set to leave more gaps between the iron core sleeve 3 and the iron core 1 for filling, so as to prevent the iron core 1 and the coil winding 2 from being too close and the insulation effect is not good enough; By adding ceramic balls into the potting compound, the thermal conductivity and insulation properties of the potting compound are improved, and the toughness of the potting compound after curing is improved; therefore, the axial motor stator has the advantages of good insulation performance, simple process and cost saving.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definitions of the appended claims range.

Claims (9)

1. An axial motor stator, comprising a casing, an iron core (1), and a coil winding (2) sleeved on the outside of the iron core (1), characterized in that the iron core (1) and the coil winding (2) An iron core sleeve (3) is arranged between the two, and the iron core sleeve (3) is made of insulating material. Between the shell and the iron core (1), the iron core (1) The gap between the coil winding (2) and the iron core (1) winding and the casing is filled with potting glue, and the iron core sleeve (3) is provided with a glue for the potting glue to pass through. A channel (4), the iron core sleeve body (3) is in the shape of a mesh, the glue passage (4) is a mesh hole on the iron core sleeve body (3), and the coil winding (2) is Three groups are respectively sleeved on the iron core (1) at intervals to form an upper coil (21), a middle coil (22) and a lower coil (23). One-to-one corresponding iron core sleeve unit (31), the iron core sleeve unit (31) is sleeved on the iron core (1), the upper coil (21), the middle coil (22) and the lower coil (23) Both are sleeved on the iron core sleeve body (31), and the iron core sleeve body monomer (31) includes an upper iron core sleeve body (311), a middle iron core sleeve body (312), a lower part The iron core sleeve body (313), the upper iron core sleeve body (311), the middle iron core sleeve body (312), and the lower iron core sleeve body (313) are adjacent in sequence and connected as a whole by the connecting piece (32) The upper iron core sleeve body (311), the middle iron core sleeve body (312), and the lower iron core sleeve body (313) correspond to the upper coil (21) and the iron core (1) respectively. ) socket connection position, the socket connection position of the middle coil (22) and the iron core (1), and the socket connection position of the lower coil (23) and the iron core (1). 2 . An axial motor stator according to claim 1 , wherein the iron core sleeve ( 3 ) is made of potting glue material. 3 . 3. An axial motor stator according to claim 2, characterized in that: the iron core sleeve body (3) is provided with a plurality of horizontally or longitudinally arranged strip-shaped glue holes. The glue channel (4) is a strip-shaped glue-passing hole on the iron core sleeve body (3). 4. An axial motor stator according to any one of claims 1-3, characterized in that: the minimum glue-passing size of the glue-passing channel (4) is 2mm-4mm. 5 . The axial motor stator according to claim 4 , wherein the potting compound is further filled with ceramic balls, and the diameter of the ceramic balls is greater than 5 mm. 6 . 6. An axial motor stator according to any one of claims 1-3, characterized in that: an isolation column (5) is further provided on the inner side of the iron core sleeve (3). 7. An axial motor applying the axial motor stator of any one of claims 1-3. 8. A production process of axial motor stator as claimed in claim 1, comprising the steps: S1. Sleeve the iron core sleeve (3) on the iron core (1), and then sleeve the coil winding (2) on the iron core sleeve (3) in turn; S2. Use potting glue to cast the iron core (1), the iron core sleeve (3), and the coil winding (2) into one body; S3, the potting glue is left to solidify or vacuum heating to solidify. 9. The production process of an axial motor stator according to claim 8, wherein the step S2 comprises first adding ceramic balls into the casing, and making the ceramic balls evenly distributed in the casing and the iron core ( 1), between the casing and the coil winding (2), and then fill in the potting glue.

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