Rotor sheath injection molding apparatus, system, method, and rotor

Abstract

The application provides a rotor sheath injection molding device, system, method and rotor; the rotor sheath injection molding device comprises an injection molding assembly and a rotor sheath; wherein the rotor sheath is in a tubular structure, both ends of the rotor sheath are open, and the rotor sheath is used for completely covering the outer periphery of a rotor assembly; the injection molding assembly is located at one end of the rotor sheath; the injection molding assembly is used for injecting injection molding material to the gap between the rotor sheath and the rotor assembly, so that the rotor sheath and the rotor assembly are fixed; the application adopts the method that the rotor sheath is formed by injection molding on the outer periphery of the rotor assembly, effectively improves the strength of the rotor, and solves the problem that the performance of the motor is affected due to the increase of the rotor strength by increasing the size of the core magnetic bridge in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of permanent magnet motors, relates to a rotor, in particular to a rotor core, and specifically relates to a rotor sheath injection molding device, system, method and rotor. BACKGROUND

[0002] Nowadays, the speed of permanent magnet motors is getting higher and higher, and some have exceeded 20000 rpm (English full name: revolutions per minute, Chinese translation: revolutions per minute). The rotor of the permanent magnet motor generates a huge centrifugal force under the condition of continuous high speed, which further causes the rotor core to displace, expand, disintegrate and other hidden dangers. At the same time, the centrifugal force generated by the rotor in the high-speed running state will cause the permanent magnet to face a large tensile stress and the risk of being thrown out.

[0003] At present, the centrifugal force generated by the high speed of the rotor is often suppressed by increasing the strength of the rotor. The existing method for increasing the strength of the rotor is to increase the size of the magnetic bridge of the core. Increasing the size of the magnetic bridge of the core can increase the mechanical strength of the rotor, but will cause the non-uniformity of the air gap magnetic field of the rotor, thereby affecting the performance of the permanent magnet motor, or will affect the overall weight and size of the permanent magnet motor. SUMMARY

[0004] The purpose of the present application is to provide a rotor sheath injection molding device, system, method and rotor for solving the problems pointed out in the background.

[0005] In a first aspect, the present application provides a rotor sheath injection molding device, which comprises: an injection molding assembly and a rotor sheath; wherein the rotor sheath is in a tubular structure, both ends of the rotor sheath are open, and the rotor sheath is used to completely cover the outer periphery of the rotor assembly; the injection molding assembly is located at one end of the rotor sheath; the injection molding assembly is used to inject injection molding material into the gap between the rotor sheath and the rotor assembly, so as to fix the rotor sheath and the rotor assembly.

[0006] In the present application, a new method for increasing the strength of the rotor is provided, that is, a rotor sheath is formed by injection molding on the outer periphery of the rotor assembly, which effectively improves the strength of the rotor and solves the problem that increasing the size of the magnetic bridge of the core to increase the strength of the rotor in the prior art affects the performance of the motor.

[0007] In an implementation form of the first aspect, the gap between the rotor sheath and the rotor assembly at least comprises a uniform gap between the inner ring of the rotor sheath and the outer periphery of the rotor assembly.

[0008] In this implementation form, the injection molding material is injected into the uniform gap between the inner ring of the rotor sheath and the outer periphery of the rotor assembly, which further improves the strength of the rotor.

[0009] In an implementation form of the first aspect, the rotor sleeve injection molding device further comprises: a tool tray, the tool tray is arranged at the other end of the rotor sleeve, the tool tray is provided with a positioning shaft, and the tool tray is used for placing the rotor assembly; the center axis of the positioning shaft is consistent with the center axis of the rotor sleeve; when the rotor assembly is arranged on the tool tray, the center axis hole of the rotor assembly is sleeved on the positioning shaft.

[0010] In the implementation form, the design of the positioning shaft plays a positioning role on the rotor assembly, which facilitates the quick and efficient installation of the rotor assembly on the tool tray. Since the center axis of the positioning shaft is consistent with the center axis of the rotor sleeve, the center axis of the rotor sleeve is consistent with the center axis of the rotor assembly, thereby ensuring the uniformity of the gap between the rotor sleeve and the rotor assembly.

[0011] In an implementation form of the first aspect, the positioning shaft is used for matched connection with the center axis hole.

[0012] In the implementation form, a connection mode of the positioning shaft and the center axis hole is provided, and stable connection between the rotor assembly and the positioning shaft is realized through matched connection of the two.

[0013] In an implementation form of the first aspect, the tool tray is further provided with a first annular groove; when the rotor assembly is arranged on the tool tray, the first annular groove is located at the outer circle of the contact end surface of the rotor assembly and the tool tray; the center axis of the first annular groove is consistent with the center axis of the rotor sleeve, the first annular groove is provided with a first sealing ring; and the other end of the rotor sleeve is in contact with the first sealing ring.

[0014] In the implementation form, through the design of the first sealing ring, the rupture of the rotor sleeve caused by too much pressure during injection molding lock molding is effectively prevented, thereby preventing overflow of injection molding glue.

[0015] In an implementation form of the first aspect, the thickness of the first sealing ring is less than or equal to the height of the first annular groove in the direction of the positioning shaft.

[0016] In the implementation form, when the thickness of the first sealing ring is less than the height of the first annular groove in the direction of the positioning shaft, the other end of the rotor sleeve can extend to the outside of the corresponding end of the rotor assembly, thereby effectively ensuring that the rotor sleeve can completely wrap the outer periphery of the rotor assembly.

[0017] In an implementation form of the first aspect, the rotor sleeve injection molding device further comprises: a fixing assembly, the fixing assembly is formed with a fixing sleeve hole, the fixing sleeve hole is sleeved on the outer periphery of the rotor sleeve, and the diameter of the fixing sleeve hole is equal to the outer diameter of the rotor sleeve.

[0018] In the present implementation, the rotor sheath is fixed by the fixed assembly, which effectively prevents the rotor assembly from expanding in diameter and the rotor sheath from cracking due to large injection pressure during injection molding, and ensures the roundness, cylindricity and concentricity of the rotor assembly after injection molding.

[0019] In an implementation form of the first aspect, the injection molding assembly comprises, in sequence from an end far away from the rotor sheath to an end close to the rotor sheath, a glue feeding plate, a flow distribution plate and a flow channel plate; the glue feeding plate, the flow distribution plate and the flow channel plate are connected; the glue feeding plate is provided with glue feeding holes; the flow distribution plate is provided with a plurality of flow distribution branches; the flow channel plate is provided with a plurality of groups of reserved injection molding holes; the reserved injection molding holes correspond to the positions of the gaps between the rotor sheath and the rotor assembly, and each group of the reserved injection molding holes corresponds to one flow distribution branch; during injection molding, the end face of the flow channel plate far away from the flow distribution plate is used to contact the rotor assembly, and the injection material enters the gaps between the rotor sheath and the rotor assembly through the glue feeding holes, the plurality of flow distribution branches and the plurality of groups of reserved injection molding holes in sequence.

[0020] In the present implementation, the structure of the glue feeding plate, the flow distribution plate and the flow channel plate is designed to ensure that the injection material can be uniformly injected into the uniform gaps between the rotor sheath and the rotor assembly, thereby effectively ensuring the injection molding effect; at the same time, the plurality of flow distribution branches and the plurality of groups of reserved injection molding holes also significantly improve the injection molding efficiency, thereby improving the production rhythm and reducing the waiting time of the previous and subsequent processes.

[0021] In an implementation form of the first aspect, the plurality of flow distribution branches are uniformly distributed on the flow distribution plate, and the plurality of flow distribution branches are symmetrically distributed about the glue feeding holes; the plurality of groups of reserved injection molding holes are uniformly distributed on the flow channel plate; the injection material uniformly enters the gaps between the rotor sheath and the rotor assembly.

[0022] In the present implementation, the uniformly distributed flow distribution branches and reserved injection molding holes effectively ensure that the injection material uniformly enters the gaps between the rotor sheath and the rotor assembly, thereby ensuring the injection molding effect while improving the injection molding efficiency.

[0023] In an implementation form of the first aspect, the end face of the flow channel plate far away from the flow distribution plate is provided with a positioning protrusion; the positioning protrusion is used to be connected with a positioning hole of the rotor assembly.

[0024] In the present implementation, the positioning protrusion is arranged in combination with the positioning hole, thereby playing a positioning role on the runner plate (or the injection molding assembly), and the runner plate and the rotor assembly can be quickly and efficiently connected, and the relative stability between the runner plate and the rotor assembly is ensured, and rotation and shaking of the runner plate relative to the rotor assembly are avoided.

[0025] In an implementation form of the first aspect, the runner plate is provided with a second annular groove on the end face away from the flow distribution plate; when the end face of the runner plate away from the flow distribution plate contacts the rotor assembly, the second annular groove is located at the outer circle of the contact end face of the runner plate and the rotor assembly; the center axis of the second annular groove is consistent with the center axis of the rotor sleeve, and a second sealing ring is arranged in the second annular groove; one end of the rotor sleeve contacts the second sealing ring.

[0026] In the present implementation, the design of the second sealing ring effectively prevents the rotor sleeve from being broken due to too much pressure during injection molding, thereby preventing overflow of the injection molding glue.

[0027] In an implementation form of the first aspect, the thickness of the second sealing ring is less than or equal to the height of the second annular groove in the direction of the center axis of the rotor sleeve.

[0028] In the present implementation, when the thickness of the second sealing ring is less than the height of the second annular groove in the direction of the center axis of the rotor sleeve, one end of the rotor sleeve can extend to the outside of the corresponding end of the rotor assembly, thereby effectively ensuring that the rotor sleeve can completely cover the outer periphery of the rotor assembly.

[0029] In a second aspect, the present application provides a rotor sleeve injection molding system, which comprises a rotor assembly and the rotor sleeve injection molding device described above; wherein the rotor assembly comprises a rotor core formed by sequentially stacking a plurality of silicon steel sheets and a magnetic steel; the outer periphery of the silicon steel sheet is located on the circumference of a same target circle, and a plurality of groups of magnetic steel grooves are distributed on the silicon steel sheet in the circumferential direction of the target circle; the magnetic steel is inserted into the magnetic steel groove; the rotor sleeve of the rotor sleeve injection molding device is sleeved on the outer periphery of the rotor core, and the rotor sleeve completely covers the outer periphery of the rotor core, and the inner diameter of the rotor sleeve is greater than the outer diameter of the rotor core; the injection molding assembly of the rotor sleeve injection molding device injects injection molding material into the gap between the rotor core and the rotor sleeve, so as to fix the rotor sleeve and the rotor core.

[0030] In the application, the gap between the rotor core and the rotor sleeve is used to inject the injection material into the gap during the injection molding process, so as to fix the rotor core and the rotor sleeve; in addition, the inner diameter of the rotor sleeve is designed to be larger than the outer diameter of the rotor core, so that the rotor sleeve can be sleeved on the outer periphery of the rotor core, and the normal injection molding process is ensured, and more injection material is injected between the rotor core and the rotor sleeve, so as to further increase the strength of the rotor assembly after the injection molding process.

[0031] In an implementation form of the second aspect, at least part of the magnetic steel slots corresponding to the end of the target circle extends to the target circle.

[0032] In an implementation form of the second aspect, there is a gap between at least part of the magnetic steel corresponding to the end of the target circle and the end of the corresponding target magnetic steel slot in the target magnetic steel slot; the target magnetic steel slot is a magnetic steel slot corresponding to the end of the target circle extending to the target circle; the injection material is injected into the gap between the end of the magnetic steel corresponding to the target circle and the end of the corresponding target magnetic steel slot in the target magnetic steel slot by the injection molding assembly, so as to fix the magnetic steel and the rotor sleeve.

[0033] In the implementation form, at least part of the magnetic steel corresponding to the end of the target circle and the end of the corresponding target magnetic steel slot in the target magnetic steel slot has a gap, so that the injection molding assembly can inject the injection material into the gap, thereby fixing the magnetic steel and the rotor sleeve.

[0034] In an implementation form of the second aspect, there is a gap between at least part of the magnetic steel corresponding to the end of the target circle and the end of the corresponding target magnetic steel slot in the target magnetic steel slot; the injection material is injected into the gap between the end of the magnetic steel corresponding to the target circle and the end of the corresponding target magnetic steel slot by the injection molding assembly, so as to fix the magnetic steel and the rotor sleeve.

[0035] In the implementation form, at least part of the magnetic steel corresponding to the end of the target circle and the end of the corresponding target magnetic steel slot in the target magnetic steel slot has a gap, so that the injection molding assembly can inject the injection material into the gap, thereby fixing the magnetic steel and the rotor sleeve.

[0036] In an implementation form of the second aspect, a plurality of groups of magnetic steel slots are uniformly distributed on the silicon steel sheet, and the magnetic steel slots and the magnetic steels are radially symmetrical about the target circle.

[0037] In the implementation form, the plurality of groups of magnetic steel slots are uniformly distributed along the circumferential direction of the target circle, and the magnetic steels and the magnetic steel slots are radially symmetrical about the target circle, so as to ensure the stability and reliability of the overall structure of the rotor sleeve and the rotor assembly after the injection molding process, and the strength of the rotor assembly.

[0038] In an implementation form of the second aspect, each of the groups of the magnetic steel slots comprises n open slots; n≥1; when n≥2, the n open slots are arranged at intervals along a radial direction of the target circle; each of the open slots comprises a first partition slot and a second partition slot; the first partition slot and the second partition slot are independent of each other, and a distance between the first partition slot and the second partition slot is a preset distance; the magnetic steel comprises a first magnetic steel sub-block and a second magnetic steel sub-block; wherein the first magnetic steel sub-block is inserted into the first partition slot, and the second magnetic steel sub-block is inserted into the second partition slot.

[0039] In an implementation form of the second aspect, the first partition slot and the second partition slot are radially symmetrical about the target circle, and an end of the first partition slot away from the second partition slot and an end of the second partition slot away from the first partition slot both extend to a circumference of the target circle; the first magnetic steel sub-block and the second magnetic steel sub-block are radially symmetrical about the target circle.

[0040] In an implementation form of the second aspect, the height of the rotor sheath is greater than or equal to the height of the rotor core.

[0041] In the implementation form, by designing the height of the rotor sheath to be greater than or equal to the height of the rotor core, it is ensured that the rotor sheath can completely cover the outer periphery of the rotor core.

[0042] In a third aspect, the present application provides a rotor sheath injection molding method realized by the above rotor sheath injection molding device, the rotor sheath injection molding method comprising: obtaining the height of the rotor assembly; obtaining the rotor sheath according to the height; completely covering the outer periphery of the rotor assembly by using the rotor sheath; locating the injection molding assembly at one end of the rotor assembly; injecting the injection molding material into the gap between the rotor sheath and the rotor assembly through the injection molding assembly, so as to fix the rotor sheath and the rotor assembly; and removing the injection molding assembly from the rotor assembly after the injection molding is completed.

[0043] In a fourth aspect, the present application provides a rotor made based on the above rotor sheath injection molding method, the rotor comprising: a rotor assembly and a rotor sheath, and an injection molding layer formed by an injection molding material; the injection molding layer is located in the gap between the rotor sheath and the rotor assembly, so as to fix the rotor sheath and the rotor assembly through the injection molding layer.

[0044] As described above, the rotor sheath injection molding device, system, method and rotor of the present application have the following beneficial effects:

[0045] (1) Compared with the prior art, the application provides a novel method for increasing the strength of a rotor, a rotor sheath is formed by injection molding on the outer periphery of a rotor assembly, the strength of the rotor assembly is improved, and the problem that increasing the size of the magnetic bridge of the iron core to increase the strength of the rotor affects the performance of the motor in the prior art is effectively solved.

[0046] (2) The application not only improves the strength of the rotor assembly by forming the rotor sheath on the outer periphery of the rotor assembly, but also further enhances the strength of the rotor assembly through the injection molding material injected between the rotor sheath and the rotor assembly, thereby better inhibiting the centrifugal force generated by high rotation speed of the rotor.

[0047] (3) The rotor sheath injection molding method provided by the application has a simple mass production process flow, and on the basis of the original production line, the production line equipment almost does not need to be newly added to realize batch production of the rotor sheath formed on the rotor assembly, thereby reducing equipment investment and improving production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 A structure schematic diagram of the rotor sheath described in the embodiment of the application is shown.

[0049] Figure 2 A structure schematic diagram of the rotor assembly described in the embodiment of the application is shown.

[0050] Figure 3 A structure schematic diagram of the rotor sheath covering the outer periphery of the rotor assembly described in the embodiment of the application is shown.

[0051] Figure 4 A top view of the rotor sheath covering the outer periphery of the rotor assembly described in the embodiment of the application is shown.

[0052] Figure 5 A structure schematic diagram of the tooling tray described in the embodiment of the application is shown.

[0053] Figure 6 A structure schematic diagram of the fixing assembly described in the embodiment of the application is shown.

[0054] Figure 7 A structure schematic diagram of the fixing assembly sleeved on the outer periphery of the rotor sheath described in the embodiment of the application is shown.

[0055] Figure 8 A structure schematic diagram of the glue feeding plate described in the embodiment of the application is shown.

[0056] Figure 9 A structure schematic diagram of the flow distribution plate described in the embodiment of the application is shown.

[0057] Figure 10 A structure schematic diagram of the flow channel plate described in the embodiment of the application is shown.

[0058] Figure 11 A structural schematic diagram of the injection molding assembly according to an embodiment of the present application is shown.

[0059] Figure 12 A structural schematic diagram of the rotor sheath injection molding device during the injection molding process according to an embodiment of the present application is shown.

[0060] Figure 13 A structural schematic diagram of the rotor according to an embodiment of the present application is shown.

[0061] Figure 14 A flow chart of the rotor sheath injection molding method according to an embodiment of the present application is shown.

[0062] Figure 15 A schematic diagram of the target circle according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0063] The present application is herein described, by way of example only, with reference to the accompanying drawings, wherein:

[0064] It is to be understood that the above-mentioned embodiments and specific examples are merely intended to describe and illustrate the present application and should not be construed to limit the scope of the present application. Various modifications made to the specific examples and embodiments of the present application, without departing from the spirit of the present application, are also within the scope of the present application.

[0065] Reference will now be made to the drawings, wherein: Figures 1 to 15The following embodiments of the present application provide a rotor sheath injection molding device, system, method and rotor, compared with the prior art, the present application provides a new method for increasing the strength of the rotor, by injecting a rotor sheath around the outer periphery of the rotor assembly, the strength of the rotor assembly is improved, effectively solving the problem that increasing the size of the core magnetic bridge to increase the strength of the rotor affects the performance of the motor in the prior art; the present application not only improves the strength of the rotor assembly by forming a rotor sheath around the outer periphery of the rotor assembly, but also further enhances the strength of the rotor assembly by injecting the injection molding material between the rotor sheath and the rotor assembly, thereby better inhibiting the centrifugal force generated by the high speed of the rotor; the rotor sheath injection molding method provided by the present application has a simple mass production process, and on the basis of the original production line, the production line equipment almost does not need to be newly added to realize the batch production of the rotor sheath injection molding on the rotor assembly, thereby reducing the equipment investment and improving the production efficiency.

[0066] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application.

[0067] As shown in Figure 3 , Figure 11 and Figure 12 , in an embodiment, the present application provides a rotor sheath injection molding device, which comprises an injection molding assembly 1 and a rotor sheath 2.

[0068] As shown in Figures 1 to 3 , in the present embodiment, the rotor sheath 2 is in a tubular structure, both ends of the rotor sheath 2 are open, and the rotor sheath 2 is used to completely cover the outer periphery of the rotor assembly 3.

[0069] As shown in Figure 7 and Figure 12 , the injection molding assembly 1 is located at one end of the rotor sheath 2 (corresponding to the upper end of the rotor sheath 2 in Figure 7 ); the injection molding assembly 1 is used to inject injection molding material into the gap between the rotor sheath 2 and the rotor assembly 3, so as to fix the rotor sheath 2 and the rotor assembly 3.

[0070] It should be noted that the injection molding assembly 1 is also located at one end of the rotor assembly 3 (as shown in Figure 2 and Figure 12 , the injection molding assembly 1 is located at the upper end of the rotor assembly 3).

[0071] In an embodiment, the injection molding material is an epoxy thermosetting plastic packaging material.

[0072] In an embodiment, the rotor sheath 2 is made of carbon fiber material.

[0073] In an embodiment, the injection molding assembly 1 is in contact with one end of the rotor assembly 3.

[0074] It should be noted that, in the injection molding process, the injection molding assembly 1 is in contact with one end of the rotor assembly 3, so that the injection molding assembly 1 is located at one end of the rotor sleeve 2; after the injection molding is completed, the injection molding assembly 1 is removed from the rotor assembly 3.

[0075] In an embodiment, the injection molding assembly 1 is used to connect with one end of the rotor assembly 3.

[0076] Specifically, as shown in Figure 2 and Figure 12 , the injection molding assembly 1 is connected with the upper end of the rotor assembly 3.

[0077] In an embodiment, the gap between the rotor sleeve 2 and the rotor assembly 3 at least includes but is not limited to a uniform gap between the inner ring of the rotor sleeve 2 and the outer periphery of the rotor assembly 3.

[0078] Specifically, by making the center axis of the rotor sleeve 2 and the center axis of the rotor assembly 3 on the same straight line, the gap between the inner ring of the rotor sleeve 2 and the outer periphery of the rotor assembly 3 is uniform, thereby ensuring the injection molding effect.

[0079] As shown in Figure 4 and Figure 13 , in an embodiment, the gap between the rotor sleeve 2 and the rotor assembly 3 includes, in addition to the above-mentioned "uniform gap between the inner ring of the rotor sleeve 2 and the outer periphery of the rotor assembly 3", the gap between the two ends of the magnetic steel 303 and the end of the corresponding magnetic steel groove 302.

[0080] As shown in Figure 2 , Figure 3 and Figure 5 , in an embodiment, the rotor sleeve injection molding device further comprises a tool tray 4.

[0081] Specifically, the tool tray 4 is arranged at the other end of the rotor sleeve 2 (corresponding to the lower end of the rotor sleeve 2 in Figure 3 ), and the tool tray 4 is provided with a positioning shaft 5, and the tool tray 4 is used to place the rotor assembly 3; the center axis of the positioning shaft 5 is consistent with the center axis of the rotor sleeve 2; when the rotor assembly 3 is arranged on the tool tray 4, the center axis hole of the rotor assembly 3 is sleeved on the positioning shaft 5.

[0082] It should be noted that, before injection molding, the rotor assembly 3 is arranged on the tool tray 4; after the injection molding is completed, the tool tray is removed.

[0083] In an embodiment, the positioning shaft 5 is used to connect with the center axis hole.

[0084] It should be noted that through the matching connection of the positioning shaft 5 and the center shaft hole, the relative stability between the rotor assembly 3 and the positioning shaft 5 can be ensured when the center shaft hole is sleeved on the positioning shaft 5, so that rotation and shaking of the rotor assembly 3 relative to the positioning shaft 5 is avoided.

[0085] As shown in the drawings, in an embodiment, the positioning shaft 5 is provided with a connecting groove 501 along the axial direction of the outer periphery thereof, and the center shaft hole is provided inwardly with a connecting protrusion (not shown in the drawings), and the size of the connecting protrusion is the same as that of the connecting groove 501. Figure 5 Specifically, when the center shaft hole is sleeved on the positioning shaft 5, the connecting protrusion is arranged in the connecting groove 501 correspondingly, the matching connection between the connecting protrusion and the connecting groove 501 is realized, and then the stable connection between the rotor assembly 3 and the positioning shaft 5 is realized.

[0086] As shown in the drawings, in an embodiment, the number of the connecting grooves 501 is two, and the two connecting grooves 501 are symmetrically distributed about the radial direction of the positioning shaft 5.

[0087] Figure 5 In an embodiment, the diameter of the positioning shaft 5 is equal to the diameter of the center shaft hole, so that when the center shaft hole is sleeved on the positioning shaft 5, the relative stability between the rotor assembly 3 and the positioning shaft 5 can be ensured, and rotation and shaking of the rotor assembly 3 relative to the positioning shaft 5 is avoided.

[0088] In an embodiment, the tool tray 4 is further provided with a first annular groove 6.

[0089] Specifically, when the rotor assembly 3 is arranged on the tool tray 4, the first annular groove 6 is located at the outer circle of the contact end surface between the rotor assembly 3 and the tool tray 4; the central axis of the first annular groove 6 is consistent with the central axis of the rotor sheath 2, the first annular groove 6 is provided with a first sealing ring 7, and the other end of the rotor sheath 2 is in contact with the first sealing ring 7.

[0090] It should be noted that through the design of the first sealing ring 7, the other end of the rotor sheath 2 is in soft contact with the first sealing ring 7 during the injection molding process (if there is no first sealing ring 7, the other end of the rotor sheath 2 is directly in hard contact with the tool tray 4), which effectively prevents the rotor sheath from being broken due to too much pressure during injection molding locking, resulting in overflow of injection molding glue.

[0091] It should be noted that through the design of the first sealing ring 7, the other end of the rotor sheath 2 is in soft contact with the first sealing ring 7 during the injection molding process (if there is no first sealing ring 7, the other end of the rotor sheath 2 is directly in hard contact with the tool tray 4), which effectively prevents the rotor sheath from being broken due to too much pressure during injection molding locking, resulting in overflow of injection molding glue.

[0092] ​In one embodiment, the first sealing ring 7 has an elastic deformation function, that is, during the injection molding process, the other end of the rotor sleeve 2 can compress and deform the first sealing ring 7, ensuring a good sealing effect while also allowing the other end of the rotor sleeve 2 to extend to the corresponding end of the rotor assembly 3 (corresponding to...). Figure 2 The outer side of the lower end of the middle rotor assembly 3 (corresponding to) Figure 2 (the lower side of the rotor), to ensure that the rotor sheath 2 can completely cover the outer periphery of the rotor assembly 3.

[0093] In one embodiment, the thickness of the first sealing ring 7 is less than or equal to the height of the first annular groove 6 along the direction of the positioning axis 5 (e.g., Figure 5 As shown, the thickness of the first sealing ring 7 is less than the height of the first annular groove 6 along the positioning axis 5.

[0094] It should be noted that when the thickness of the first sealing ring 7 is less than the height of the first annular groove 6 along the positioning shaft 5, the other end of the rotor sleeve 2 can extend to the outside of the corresponding end of the rotor assembly 3, thereby effectively ensuring that the rotor sleeve 2 can completely cover the outer periphery of the rotor assembly 3.

[0095] Similarly, when the thickness of the first sealing ring 7 is equal to the height of the first annular groove 6 along the positioning shaft 5, since the first sealing ring 7 has an elastic deformation function, the other end of the rotor sleeve 2 can also extend to the outside of the corresponding end of the rotor assembly 3 (by squeezing the first sealing ring 7 by the other end of the rotor sleeve 2, causing it to undergo elastic deformation), thereby effectively ensuring that the rotor sleeve 2 can completely cover the outer periphery of the rotor assembly 3.

[0096] like Figure 7 and Figure 12 As shown, in one embodiment, the rotor sheath injection molding device further includes a fixing component 8.

[0097] Specifically, the fixing component 8 has a fixing hole 801; the fixing hole 801 is fitted around the outer periphery of the rotor sheath 2, and the diameter of the fixing hole 801 is equal to the outer diameter of the rotor sheath 2.

[0098] It should be noted that the setting of the fixing component 8 plays a stabilizing role for the rotor sleeve 2, which is used to prevent the outer diameter of the rotor assembly 3 from increasing and the rotor sleeve 2 from cracking due to the large injection pressure during the injection molding process, thus ensuring the roundness, cylindricity and concentricity of the rotor assembly after injection molding.

[0099] It should be noted that before injection molding, the outer periphery of the rotor sheath 2 is wrapped with the fixing component 8; after injection molding is completed, the fixing component 8 is removed.

[0100] In one embodiment, the fixing component 8 is placed on the tooling tray 4 before injection molding; after injection molding is completed, it is removed from the tooling tray 4.

[0101] In one embodiment, the fixing component 8 is made of at least, but not limited to, the following materials: steel, iron, and aluminum.

[0102] like Figure 6 As shown, in one embodiment, the fixing component 8 includes two first clamps 802 and second clamps 803 with semi-cylindrical (formed by radial cutting along a cylinder) perforated structures.

[0103] Specifically, the first clamp 802 and the second clamp 803 are connected; two semi-cylindrical perforated structures cooperate to form the fixing sleeve hole 801.

[0104] like Figure 2 , Figure 4 and Figure 15 As shown, in one embodiment, the rotor assembly 3 includes a rotor core formed by sequentially stacking magnets 303 and a plurality of silicon steel sheets 301.

[0105] Specifically, such as Figure 15 As shown, the outer periphery of the silicon steel sheet 301 is located on the same target circle (corresponding to...). Figure 15 On the red curve L in the diagram, multiple sets of magnetic grooves 302 are distributed along the circumference of the target circle on the silicon steel sheet 301. Figure 4 (Taking an example including 8 sets of magnet slots 302) The magnets 303 are inserted into the magnet slots 302; the rotor sleeve 2 is fitted around the outer periphery of the rotor core, and the rotor sleeve 2 completely covers the outer periphery of the rotor core, the inner diameter of the rotor sleeve 2 is larger than the outer diameter of the rotor core; the injection molding assembly 1 is located at one end of the rotor core; injection molding material is injected into the gap between the rotor core and the rotor sleeve 2 through the injection molding assembly 1 to fix the rotor sleeve 2 to the rotor core.

[0106] It should be noted that by creating a gap between the rotor core and the rotor sleeve 2, the rotor core and rotor sleeve 2 can be fixed by injecting injection molding material into the gap during injection molding. In addition, by designing the inner diameter of the rotor sleeve 2 to be larger than the outer diameter of the rotor core, it is ensured that the rotor sleeve 2 can be fitted onto the outer circumference of the rotor core while ensuring the normal progress of injection molding. Furthermore, by injecting more injection molding material between the two, the strength of the rotor assembly after injection molding is further increased.

[0107] like Figure 4 and Figure 15 As shown, at least a portion of the magnetic groove 302 extends to the circumference of the target circle at the end corresponding to the target circle.

[0108] In an embodiment, at least part of the magnetic steel 303 in the target magnetic steel slot has a gap between the end corresponding to the circumference of the target circle and the end of the corresponding target magnetic steel slot.

[0109] In the embodiment, the target magnetic steel slot is the magnetic steel slot 302 extending to the circumference of the target circle corresponding to the end.

[0110] It should be noted that the injection molding assembly 1 injects the injection molding material into the gap between the end of the magnetic steel 303 in the target magnetic steel slot corresponding to the circumference of the target circle and the end of the corresponding target magnetic steel slot, so as to fix the magnetic steel 303 and the rotor sleeve 2; specifically, when the injection molding material is injected into the gap between the end of the magnetic steel 303 in the target magnetic steel slot corresponding to the circumference of the target circle and the end of the corresponding target magnetic steel slot, on the one hand, the injection molding material fills the gap between the end of the magnetic steel 303 in the target magnetic steel slot corresponding to the circumference of the target circle and the end of the corresponding target magnetic steel slot; on the other hand, the injection molding material fills the gap between the end of the target magnetic steel slot corresponding to the circumference of the target circle and the rotor sleeve 2, so as to fix the magnetic steel 303 in the target magnetic steel slot and the rotor sleeve 2.

[0111] As shown in FIG. 1, in an embodiment, at least part of the magnetic steel 303 has a gap between one end and / or the other end and the end of the corresponding magnetic steel slot 302; the injection molding assembly 1 injects the injection molding material into the gap between one end and / or the other end of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302, so as to fix the rotor core and the magnetic steel 303. Figure 4 It should be noted that the gap between one end and / or the other end of at least part of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302 is formed, and the injection molding assembly 1 injects the injection molding material into the gap, so as to fix the rotor core and the magnetic steel 303.

[0112] As shown in FIG. 1, in an embodiment, a plurality of groups of magnetic steel slots 302 are uniformly distributed on the silicon steel sheet 301, and the magnetic steel slots 302 and the magnetic steel 303 are radially symmetrical about the target circle.

[0113] Figure 4 It should be noted that the plurality of groups of magnetic steel slots 302 are uniformly distributed along the circumferential direction of the target circle, and the magnetic steel 303 and the magnetic steel slot 302 are radially symmetrical about the target circle, so as to ensure the stability and reliability of the overall structure of the rotor sleeve 2 and the rotor assembly 3 after injection molding, and the strength of the rotor assembly 3.

[0114] It should be noted that the plurality of groups of magnetic steel slots 302 are uniformly distributed along the circumferential direction of the target circle, and the magnetic steel 303 and the magnetic steel slot 302 are radially symmetrical about the target circle, so as to ensure the stability and reliability of the overall structure of the rotor sleeve 2 and the rotor assembly 3 after injection molding, and the strength of the rotor assembly 3.

[0115] ​In one embodiment, the inner diameter of the rotor sheath 2 is 0.2mm-3mm larger than the outer diameter of the rotor core.

[0116] In one embodiment, the thickness of the rotor sheath 2 is between 0.3 mm and 3 mm.

[0117] like Figure 4 As shown, in one embodiment, each group of magnetic slots 302 includes n open slots (not shown in the figure); n≥1, and n is a positive integer.

[0118] like Figure 4 As shown, in this embodiment, when n≥2 (taking n=2 as an example in the figure), the n open slots are spaced apart along the radial direction of the target circle; each open slot includes a first partition slot 3021 and a second partition slot 3022.

[0119] like Figure 4 As shown, the first partition groove 3021 and the second partition groove 3022 are independent of each other, and the first partition groove 3021 and the second partition groove 3022 are separated by a preset distance; the magnet 303 includes a first magnet block 3031 and a second magnet block 3032; wherein, the first magnet block 3031 is inserted into the first partition groove 3021, and the second magnet block 3032 is inserted into the second partition groove 3022.

[0120] like Figure 4 As shown, in one embodiment, the first dividing groove 3021 and the second dividing groove 3022 are radially symmetrical about the target circle, and the end of the first dividing groove 3021 away from the second dividing groove 3022 and the end of the second dividing groove 3022 away from the first dividing groove 3021 both extend to the circumference of the target circle; the first magnet block 3031 and the second magnet block 3032 are radially symmetrical about the target circle.

[0121] like Figure 4 As shown, in one embodiment, there are gaps between the two ends of the first magnet block 3031 and the ends of the corresponding rotor sleeve 2 and the first partition groove 3021, and between the two ends of the second magnet block 3032 and the ends of the corresponding rotor sleeve 2 and the second partition groove 3022.

[0122] Specifically, the injection molding assembly 1 injects the injection molding material into the gaps between the two ends of the first magnet block 3031 and the corresponding ends of the rotor sleeve 2 and the first partition groove 3021, and between the two ends of the second magnet block 3032 and the corresponding ends of the rotor sleeve 2 and the second partition groove 3022, so as to fix the rotor sleeve 2, the rotor core and the magnet 303.

[0123] As shown in Figures 7 to 11 , in an embodiment, the injection molding assembly 1 comprises, from the end far away from the rotor sleeve 2 to the end close to the rotor sleeve 2, in order, a glue feeding plate 101, a flow distribution plate 102 and a runner plate 103.

[0124] Specifically, the glue feeding plate 101, the flow distribution plate 102 and the runner plate 103 are connected; wherein, as shown in Figure 8 , the glue feeding plate 101 is provided with a glue feeding hole 104; the flow distribution plate 102 is distributed with a plurality of flow distribution branches 105 (8 flow distribution branches 105 are taken as an example for illustration); the runner plate 103 is distributed with a plurality of groups of reserved injection molding holes 106; the reserved injection molding holes 106 correspond to the gap positions between the rotor sleeve 2 and the rotor assembly 3 (specifically, the rotor core), and each group of the reserved injection molding holes 106 corresponds to one flow distribution branch 105. Figure 9

[0125] In an embodiment, the plurality of flow distribution branches 105 are uniformly distributed on the flow distribution plate 102, and the plurality of flow distribution branches 105 are symmetrically distributed about the glue feeding hole 104 (as shown in Figure 9 , the plurality of flow distribution branches 105 are symmetrically and uniformly distributed along the radial direction of the glue feeding hole 104 with the glue feeding hole 104 as the center); the plurality of groups of the reserved injection molding holes are uniformly distributed on the runner plate (as shown in Figure 10 , the plurality of groups of the reserved injection molding holes 106 are also symmetrically and uniformly distributed along the radial direction of the glue feeding hole 104 with the glue feeding hole 104 as the center); the injection molding material uniformly enters the gap between the rotor sleeve 2 and the rotor assembly 3.

[0126] It should be noted that, during injection molding, the end face of the runner plate 103 far away from the flow distribution plate 102 is used to contact the rotor assembly 3 (specifically, the silicon steel sheet 301 in the uppermost layer of the rotor core), and the injection molding material enters the gap between the rotor sleeve 2 and the rotor assembly 3 (specifically, the rotor core) through the glue feeding hole 104, the plurality of flow distribution branches 105 and the plurality of groups of the reserved injection molding holes 106 in order.

[0127] Corresponding to the embodiment in Figure 4 , as shown in Figure 10 , each group of the reserved injection molding holes 106 comprises 8 injection molding points (respectively corresponding to Figure 10 ​The eight small circles in the reserved injection hole 106 marked in the figure are divided into two groups (corresponding to the aforementioned n=2), with four injection points in each group. The four injection points in each group correspond to the gap between one end of the first magnet block 3031 and the rotor sleeve 2, the gap between the other end of the first magnet block 3031 and the end of the corresponding first partition groove 3021, the gap between one end of the second magnet block 3032 and the rotor sleeve 2, and the gap between the other end of the second magnet block 3032 and the end of the corresponding second partition groove 3022.

[0128] In one embodiment, the flow channel plate 103 has a positioning protrusion 107 on the end face away from the flow divider plate 102.

[0129] Specifically, the positioning protrusion 107 is used to engage with the positioning hole 304 of the rotor assembly 3.

[0130] like Figure 15 and Figure 11 As shown, in one embodiment, the number of the positioning protrusions 107 is two, and the two positioning protrusions 107 are radially symmetrically distributed about the target circle.

[0131] like Figure 3 As shown, the positioning hole 304 is provided on the silicon steel sheet 301.

[0132] In one embodiment, the number of positioning holes 304 on each of the silicon steel sheets 301 is greater than or equal to two.

[0133] Specifically, when the number of positioning holes 304 is greater than or equal to two, all positioning holes 304 are evenly and symmetrically distributed radially around the target circle.

[0134] by Figure 3 Taking the example of setting 8 positioning holes 304 on each silicon steel sheet 301, it should be noted that the two positioning holes 304 that are radially symmetrically distributed about the target circle are used to connect with the two positioning protrusions 107 mentioned above; the remaining six positioning holes 304 are used as weight reduction holes to reduce the overall weight of the rotor assembly 3.

[0135] In one embodiment, a second annular groove 108 is provided on the end face of the flow channel plate 103 away from the flow divider plate 102.

[0136] Specifically, when the flow channel plate 103 contacts the rotor assembly 3 (specifically, the silicon steel sheet 301 in the uppermost layer of the rotor core) away from the end surface of the flow distribution plate 102, the second annular groove 108 is located at the outer circle of the contact end surface of the rotor assembly 3 (specifically, the silicon steel sheet 301 in the uppermost layer of the rotor core) and the flow channel plate 103; the central axis of the second annular groove 108 is consistent with the central axis of the rotor sleeve 2, and the second annular groove 108 is provided with a second sealing ring 109; one end of the rotor sleeve 2 contacts the second sealing ring 109.

[0137] It should be noted that through the design of the second sealing ring 109, the end of the rotor sleeve 2 and the second sealing ring 109 are in soft contact during the injection molding process (if there is no second sealing ring 109, the end of the rotor sleeve 2 directly contacts the flow channel plate 103 in hard contact), which effectively prevents the rotor sleeve from being broken due to excessive pressure during injection molding locking, causing overflow of injection molding glue.

[0138] In an embodiment, the second sealing ring 109 has an elastic deformation function, that is, during the injection molding process, the end of the rotor sleeve 2 can extrude and deform the second sealing ring 109, which not only ensures good sealing effect, but also extends the end of the rotor sleeve 2 to the outside of the corresponding end of the rotor assembly 3 (corresponding to the upper end of the rotor assembly 3 in the Figure 2 , to the outside of the corresponding end of the rotor assembly 3 (corresponding to the upper end of the rotor assembly 3 in the Figure 2 , to ensure that the rotor sleeve 2 can completely cover the outer periphery of the rotor assembly 3 (specifically, the rotor core).

[0139] In an embodiment, the thickness of the second sealing ring 109 is less than or equal to the height of the second annular groove 108 along the central axis direction of the rotor sleeve 2 (as shown in Figure 3 and Figure 11 , the thickness of the second sealing ring 109 is less than the height of the second annular groove 108 along the central axis direction of the rotor sleeve 2).

[0140] It should be noted that when the thickness of the second sealing ring 109 is less than the height of the second annular groove 108 along the central axis direction of the rotor sleeve 2, the end of the rotor sleeve 2 can extend to the outside of the corresponding end of the rotor assembly 3, thereby effectively ensuring that the rotor sleeve 2 can completely cover the outer periphery of the rotor assembly 3.

[0141] Similarly, when the thickness of the second sealing ring 109 is equal to the height of the second annular groove 108 along the central axis of the rotor sleeve 2, the end of the rotor sleeve 2 can also extend to the outside of the corresponding end of the rotor assembly 3 (by extruding the second sealing ring 109 at the end of the rotor sleeve 2 to cause elastic deformation), thereby effectively ensuring that the rotor sleeve 2 can completely wrap around the outer periphery of the rotor assembly 3.

[0142] It should be noted that in actual application, the height of the rotor sleeve 2 can be determined according to the height of the rotor core obtained by testing before injection molding, and then the rotor sleeve 2 is sleeved on the outer periphery of the rotor core so as to completely wrap the outer periphery of the rotor core.

[0143] In an embodiment, the height of the rotor core is tested by using a laser size sensor, an electronic ruler, etc.

[0144] In an embodiment, the rotor core is compressed before testing the height of the rotor core, so as to make the height test of the rotor core more accurate.

[0145] It should be noted that the pressure for compressing the rotor core can be set according to the subsequent injection molding locking force.

[0146] Specifically, after obtaining the height of the rotor core, the sleeve pipe material is cut according to the height to obtain the rotor sleeve 2.

[0147] It should be noted that the height of the rotor sleeve 2 cannot be too high or too low. If the height of the rotor sleeve 2 is too high, the rotor sleeve 2 will be cracked during injection molding; if the height of the rotor sleeve 2 is too low, the injection molding will overflow.

[0148] In an embodiment, the height of the rotor sleeve 2 is greater than or equal to the height of the rotor core.

[0149] In an embodiment, after the rotor sleeve 2 is sleeved on the outer periphery of the rotor core, the distance between the two end portions of the rotor sleeve 2 and the two end portions of the corresponding rotor core is less than or equal to 10 mm.

[0150] It should be noted that in actual application, after injection molding is completed, the two end portions of the rotor sleeve 2 can respectively extend to the outside of the two end portions of the corresponding rotor core, but cannot extend too much, and it is necessary to ensure that the performance of the motor is not affected. Therefore, when the height of the rotor sleeve 2 is greater than the height of the rotor core, it cannot be too large, and the elastic deformation ability of the first sealing ring 7 and the second sealing ring 109 should be considered comprehensively.

[0151] Corresponding Figure 12In the embodiment described above, after injection molding is completed, the tooling tray 4, the fixing component 8, and the injection molding component 1 are removed, ultimately resulting in the following... Figure 13 As shown, a rotor structure with a rotor sheath 2 injection molded on the outer periphery of the rotor assembly 3.

[0152] It should be noted that in the existing technology, there is also a method of increasing rotor strength by winding a sheath around the outer ring of the rotor. However, the sheath winding technology is currently limited by the slow cycle time of the winding equipment and the long curing time after winding, which affects the production cycle and overall efficiency and cannot meet the needs of mass production. The present invention directly adopts a tubular rotor sheath and fixes it to the outer circumference of the rotor core by injection molding. While improving production efficiency, the increase in injection molding material also greatly enhances the strength of the rotor.

[0153] like Figures 1 to 12 ,and Figure 15 As shown, in one embodiment, the present invention also provides a rotor sleeve injection molding system, the rotor sleeve injection molding system comprising: rotor assembly 3 and the above-mentioned rotor sleeve injection molding device.

[0154] Specifically, the rotor assembly 3 includes: a rotor core formed by sequentially stacking magnets 303 and multiple silicon steel sheets 301; the outer periphery of the silicon steel sheets 301 is located on the circumference of the same target circle, and multiple sets of magnet slots 302 are distributed on the silicon steel sheets 301 along the circumferential direction of the target circle; the magnets 303 are inserted into the magnet slots 302; the rotor sleeve 2 of the rotor sleeve injection molding device is sleeved on the outer periphery of the rotor core, and the rotor sleeve 2 completely covers the outer periphery of the rotor core, and the inner diameter of the rotor sleeve 2 is larger than the outer diameter of the rotor core; the injection molding assembly of the rotor sleeve injection molding device is located at one end of the rotor core; injection molding material is injected into the gap between the rotor core and the rotor sleeve 2 through the injection molding assembly 1 to fix the rotor sleeve 2 to the rotor core.

[0155] In one embodiment, at least a portion of the magnetic groove 302 extends to the outer periphery of the silicon steel sheet 301 at the end corresponding to the circumference of the target circle.

[0156] In one embodiment, at least a portion of the magnet 303 has a gap between the end of the magnet 303 corresponding to the circumference of the target circle and the end of the corresponding target magnet groove; the target magnet groove is a magnet groove 302 extending from the end of the end of the target circle to the circumference of the target circle; injection molding material is injected into the gap between the end of the magnet 303 corresponding to the circumference of the target circle and the end of the corresponding target magnet groove in the target magnet groove through the injection molding assembly 1, so that the magnet 303 is fixed to the rotor sleeve 2.

[0157] In an embodiment, at least one end of the magnetic steel 303 and / or the other end and the corresponding end of the magnetic steel slot 302 have a gap; the gap between the one end of the magnetic steel 303 and / or the other end and the corresponding end of the magnetic steel slot 302 is filled with the injection molding material by the injection molding assembly 1, so as to fix the rotor core and the magnetic steel 303.

[0158] In an embodiment, a plurality of groups of magnetic steel slots 302 are uniformly distributed on the silicon steel sheet 301, and the magnetic steel slots 302 and the magnetic steel 303 are radially symmetrical about the target circle.

[0159] In an embodiment, each group of the magnetic steel slots 302 includes n open slots; n≥1; when n≥2, the n open slots are arranged at intervals in the radial direction of the target circle; each open slot includes a first partition slot 3021 and a second partition slot 3022; the first partition slot 3021 and the second partition slot 3022 are independent of each other, and the first partition slot 3021 and the second partition slot 3022 are separated by a predetermined distance; the magnetic steel 303 includes a first magnetic steel sub-block 3031 and a second magnetic steel sub-block 3032; wherein the first magnetic steel sub-block 3031 is inserted into the first partition slot 3021, and the second magnetic steel sub-block 3032 is inserted into the second partition slot 3022.

[0160] In an embodiment, the first partition slot 3021 and the second partition slot 3022 are radially symmetrical about the target circle, and the end of the first partition slot 3021 away from the second partition slot 3022 and the end of the second partition slot 3022 away from the first partition slot 3021 both extend to the circumference of the target circle; the first magnetic steel sub-block 3031 and the second magnetic steel sub-block 3032 are radially symmetrical about the target circle.

[0161] In an embodiment, there is a gap between the two ends of the first magnetic steel sub-block 3031 and the corresponding end of the rotor sheath 2 and the first partition slot 3021, and between the two ends of the second magnetic steel sub-block 3032 and the corresponding end of the rotor sheath 2 and the second partition slot 3022; the gap between the two ends of the first magnetic steel sub-block 3031 and the corresponding end of the rotor sheath 2 and the first partition slot 3021, and between the two ends of the second magnetic steel sub-block 3032 and the corresponding end of the rotor sheath 2 and the second partition slot 3022 is filled with the injection molding material by the injection molding assembly 1, so as to fix the rotor sheath 2, the rotor core and the magnetic steel 303.

[0162] In an embodiment, the height of the rotor sheath 2 is greater than or equal to the height of the rotor core.

[0163] It should be noted that the working principle of the rotor sheath injection molding system is the same as that of the rotor sheath injection molding device described above, and therefore will not be described in detail here.

[0164] As shown in the figure, in an embodiment, the present application also provides a rotor sheath injection molding method based on the rotor sheath injection molding device described above, which comprises the following steps: Figure 14

[0165] Step S1, obtaining the height of the rotor assembly.

[0166] Step S2, obtaining the rotor sheath according to the height.

[0167] Step S3, completely covering the outer periphery of the rotor assembly with the rotor sheath.

[0168] Step S4, positioning the injection molding assembly at one end of the rotor assembly.

[0169] It should be noted that when the injection molding assembly is positioned at one end of the rotor assembly, it is also positioned at one end of the rotor sheath.

[0170] Step S5, injecting injection molding material into the gap between the rotor sheath and the rotor assembly through the injection molding assembly to fix the rotor sheath and the rotor assembly.

[0171] Step S6, removing the injection molding assembly from the rotor assembly after the injection molding is completed.

[0172] It should be noted that the working principle of the rotor sheath injection molding method can refer to the description of the rotor sheath injection molding device above, and therefore will not be described in detail here.

[0173] The rotor sheath injection molding method described in the embodiments of the present application is not limited to the order of the steps listed in the embodiments, and any scheme achieved by adding, replacing or deleting steps of the prior art according to the principle of the present application is included in the protection scope of the present application.

[0174] As shown in the figure, in an embodiment, the present application also provides a rotor based on the rotor sheath injection molding method described above, which comprises a rotor assembly 3 and a rotor sheath 2, and an injection molding layer (not shown in the figure) formed by injection molding material. Figure 13 Specifically, the injection molding layer is located in the gap between the rotor sheath 2 and the rotor assembly 3, so as to fix the rotor sheath 2 and the rotor assembly 3 through the injection molding layer.

[0175]

[0176] ​​The descriptions of the corresponding flow or structure of each of the above figures are each focused, and the parts not described in detail in a certain flow or structure can be referred to the related description of other flow or structure.

[0177] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present application should be covered by the claims of the present application.

Claims

1. A rotor sheath injection molding device, characterized in that, The rotor sleeve injection molding device includes: an injection molding assembly and a rotor sleeve; wherein... The rotor sheath has a tubular structure with open ends, and is used to completely cover the outer periphery of the rotor assembly. The injection molding assembly is located at one end of the rotor sheath; The injection molding assembly is used to inject injection molding material into the gap between the rotor sheath and the rotor assembly to fix the rotor sheath to the rotor assembly; The rotor sleeve injection molding device also includes: a tooling tray; The tooling tray is located at the other end of the rotor sleeve, and a positioning shaft is provided on the tooling tray. The tooling tray is used to place the rotor assembly; the central axis of the positioning shaft is consistent with the central axis of the rotor sleeve. When the rotor assembly is placed on the tooling tray, the central shaft hole of the rotor assembly is fitted onto the positioning shaft; The tooling tray is also provided with a first annular groove; When the rotor assembly is placed on the tooling tray, the first annular groove is located on the outer ring of the contact end face between the rotor assembly and the tooling tray. The central axis of the first annular groove is consistent with the central axis of the rotor sheath, and a first sealing ring is provided in the first annular groove; The other end of the rotor sheath is in contact with the first sealing ring; The injection molding assembly, from the end furthest from the rotor sheath to the end closest to the rotor sheath, sequentially includes: a sprue plate, a manifold plate, and a runner plate; the sprue plate, the manifold plate, and the runner plate are connected; wherein... The glue inlet plate is provided with glue inlet holes; The flow divider plate has multiple flow branches distributed thereon; The flow channel plate is distributed with multiple sets of reserved injection holes; the reserved injection holes correspond to the gap between the rotor sheath and the rotor assembly, and each set of reserved injection holes corresponds to one of the branch channels; During injection molding, the end face of the flow channel plate away from the flow divider plate is used to contact the rotor assembly, and the injection material enters the gap between the rotor sleeve and the rotor assembly in sequence through the injection hole, multiple flow dividers and multiple sets of reserved injection holes; The flow channel plate is provided with a second annular groove on the end face away from the flow divider plate; When the end face of the flow channel plate away from the flow divider plate contacts the rotor assembly, the second annular groove is located on the outer ring of the end face of the rotor assembly in contact with the flow channel plate; The central axis of the second annular groove is consistent with the central axis of the rotor sheath, and a second sealing ring is provided in the second annular groove; One end of the rotor sheath is in contact with the second sealing ring.

2. The rotor sheath injection molding device according to claim 1, characterized in that, The gap between the rotor sheath and the rotor assembly includes at least a uniform gap between the inner ring of the rotor sheath and the outer periphery of the rotor assembly.

3. The rotor sheath injection molding device according to claim 1, characterized in that, The positioning shaft is used to connect with the central shaft hole.

4. The rotor sheath injection molding device according to claim 1, characterized in that, The thickness of the first sealing ring is less than or equal to the height of the first annular groove along the positioning axis.

5. The rotor sheath injection molding device according to claim 1, characterized in that, The rotor sheath injection molding device further includes: a fixing component; The fixing component has a fixing hole; the fixing hole is fitted onto the outer periphery of the rotor sheath, and the diameter of the fixing hole is equal to the outer diameter of the rotor sheath.

6. The rotor sheath injection molding device according to claim 1, characterized in that, The multiple flow channels are evenly distributed on the flow distribution plate, and the multiple flow channels are symmetrically distributed about the glue inlet hole; Multiple sets of the reserved injection holes are evenly distributed on the flow channel plate; The injection molding material is evenly injected into the gap between the rotor sheath and the rotor assembly.

7. The rotor sheath injection molding device according to claim 1, characterized in that, The flow channel plate has a positioning protrusion on its end face away from the flow divider plate; the positioning protrusion is used to engage with the positioning hole of the rotor assembly.

8. The rotor sheath injection molding device according to claim 1, characterized in that, The thickness of the second sealing ring is less than or equal to the height of the second annular groove along the central axis of the rotor sheath.

9. A rotor sheath injection molding system, characterized in that, The rotor sheath injection molding system includes: a rotor assembly and a rotor sheath injection molding device according to any one of claims 1 to 8; wherein, the rotor assembly includes: a rotor core formed by sequentially stacking magnets and multiple silicon steel sheets; The outer periphery of the silicon steel sheet is located on the circumference of the same target circle, and multiple sets of magnetic grooves are distributed on the silicon steel sheet along the circumferential direction of the target circle. The magnet is inserted into the magnet slot; The rotor sleeve of the rotor sleeve injection molding device is sleeved on the outer periphery of the rotor core, and the rotor sleeve completely covers the outer periphery of the rotor core. The inner diameter of the rotor sleeve is larger than the outer diameter of the rotor core. The rotor sleeve injection device injects injection molding material into the gap between the rotor core and the rotor sleeve through the injection molding assembly, so as to fix the rotor sleeve to the rotor core.

10. The rotor sheath injection molding system according to claim 9, characterized in that, At least a portion of the magnetic groove extends to the circumference of the target circle at its corresponding end.

11. The rotor sheath injection molding system according to claim 10, characterized in that, At least a portion of the magnet in the target magnet groove has a gap between the end of the magnet corresponding to the circumference of the target circle and the end of the corresponding target magnet groove; the target magnet groove is a magnet groove that extends from the end of the magnet corresponding to the circumference of the target circle to the circumference of the target circle; injection molding material is injected into the gap between the end of the magnet corresponding to the circumference of the target circle and the end of the corresponding target magnet groove in the target magnet groove through the injection molding assembly, so as to fix the magnet to the rotor sheath.

12. The rotor sheath injection molding system according to claim 9, characterized in that, There is at least a gap between one end and / or the other end of a portion of the magnet and the end of the corresponding magnet groove; The injection molding assembly injects molding material into the gap between one end and / or the other end of the magnet and the end of the corresponding magnet slot, thereby fixing the rotor core to the magnet.

13. The rotor sheath injection molding system according to claim 9, characterized in that, Multiple sets of magnetic grooves are evenly distributed on the silicon steel sheet, and both the magnetic grooves and the magnets are radially symmetrical about the target circle.

14. The rotor sheath injection molding system according to any one of claims 9 to 13, characterized in that, Each group of magnetic steel slots includes n open slots; n≥1; When n≥2, the n open slots are spaced apart along the radial direction of the target circle; Each of the open slots includes a first partition slot and a second partition slot; The first dividing groove and the second dividing groove are independent of each other, and the first dividing groove and the second dividing groove are separated by a preset distance; The magnet includes a first magnet block and a second magnet block; wherein the first magnet block is inserted into the first dividing groove, and the second magnet block is inserted into the second dividing groove.

15. The rotor sheath injection molding system according to claim 14, characterized in that, The first dividing groove and the second dividing groove are radially symmetrical about the target circle, and the end of the first dividing groove away from the second dividing groove and the end of the second dividing groove away from the first dividing groove both extend to the circumference of the target circle; the first magnet segment and the second magnet segment are radially symmetrical about the target circle.

16. The rotor sheath injection molding system according to claim 9, characterized in that, The height of the rotor sheath is greater than or equal to the height of the rotor core.

17. A rotor sleeve injection molding method based on the rotor sleeve injection molding apparatus according to any one of claims 1 to 8, characterized in that, The rotor sheath injection molding method includes: Get the height of the rotor assembly; The rotor sheath is obtained based on the height; The rotor assembly is completely covered by the rotor sheath. Position the injection molding assembly at one end of the rotor assembly; Injection molding material is injected into the gap between the rotor sheath and the rotor assembly through the injection molding assembly to fix the rotor sheath to the rotor assembly; After injection molding is completed, the injection molding assembly is removed from the rotor assembly.

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