Outer rotor motor and refrigeration equipment
By adopting interference fit and structural design of cast aluminum parts in the outer rotor motor, the problem of poor connection stability between the rotor core and the shell is solved, the working efficiency and structural strength of the motor are improved, and the power loss is reduced.
Patent Information
- Application Number
- CN202323459522.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-18
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2033-12-18
AI Technical Summary
The connection stability of the rotor core and the shell in the outer rotor motor is poor, which leads to severe heat generation after long-term use, which may cause the core to detach from the shell, reducing the rotation efficiency of the rotating shaft and the working efficiency of the outer rotor motor.
The rotor core is fixed to the inside of the casing by interference fit, and the stability is increased through the connecting columns and cogging structure of the cast aluminum parts, and pure aluminum materials are used to slow down temperature rise and improve conductive performance and structural strength.
It improves the connection stability of the rotor core and the casing, avoids loosening caused by damage to the connecting structure, reduces power loss and heat consumption, and improves the working efficiency of the outer rotor motor.
Smart Images
Figure CN222234508U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor structure, in particular to an outer rotor motor and refrigeration equipment. Background Art
[0002] The rotor core in the outer rotor motor is fixed on the outer casing. In the related art, the connection stability between the rotor core and the outer casing of the outer rotor motor is poor. After the outer rotor motor is used for a long time, the rotor core will heat up seriously, which will easily cause a gap at the connection between the rotor core and the outer casing, and even cause the rotor core to separate from the outer casing, thereby causing the outer casing and the rotor core to rotate relative to each other, which will reduce the rotation efficiency of the rotating shaft and reduce the working efficiency of the outer rotor motor. Utility Model Content
[0003] The main purpose of the utility model is to provide an outer rotor motor, aiming to increase the connection stability between the rotor core and the shell.
[0004] To achieve the above-mentioned purpose, the outer rotor motor proposed in the utility model comprises:
[0005] stator assembly; and
[0006] An outer rotor assembly, comprising a housing, a rotor core, a rotating shaft and an aluminum casting, wherein the housing has a mounting cavity, the rotor core is interference-fitted with the mounting cavity, the rotating shaft is fixedly connected to the housing, and the rotating shaft is rotatably connected to the stator assembly after passing through the rotor core, and a plurality of tooth slots are formed on the rotor core, and the plurality of tooth slots are evenly spaced along the circumference of the rotor core;
[0007] The aluminum casting includes a first end ring, a second end ring and a plurality of connecting columns, the connecting columns are formed in the tooth grooves one by one, the first end ring and the second end ring are respectively formed at the two ends of the rotor core, and the two ends of the connecting column are respectively connected to the first end ring and the second end ring.
[0008] Optionally, the aluminum casting is die-cast on the rotor core.
[0009] Optionally, the outer circumferential wall of the second end ring is spaced apart from the inner circumferential wall of the casing, and the second end ring is spaced apart from the bottom wall of the casing.
[0010] Optionally, the material of the aluminum casting is pure aluminum.
[0011] Optionally, a plurality of teeth are convexly provided on the inner circumference of the rotor core, the plurality of teeth are evenly spaced along the circumferential direction, a tooth groove is provided between any two adjacent teeth, and the side wall of the connecting column is flush with the end face of the tooth.
[0012] Optionally, the stator assembly includes a stator and a stator end cover, the stator is fixed to the stator end cover and extends into the interior of the rotor core, the stator end cover is covered on the casing, the stator is spaced apart from the inner circumferential wall of the rotor core, and the outer circumferential wall of the first end ring is spaced apart from the inner circumferential wall of the stator end cover.
[0013] Optionally, the rotor core is connected to the casing by hot pressing or cold pressing.
[0014] Optionally, a bushing is provided at the bottom of the housing, the bushing extends into the housing, the bushing has a mounting hole, and the rotating shaft is fixedly inserted into the mounting hole.
[0015] Optionally, a stepped hole is provided at the bottom of the casing, the shape of the bushing is adapted to the shape of the stepped hole, the bushing is fixedly inserted in the stepped hole, and the end face of the bushing is flush with the bottom wall of the casing.
[0016] Optionally, the outer peripheral wall of the bushing is welded to the inner peripheral wall of the step hole.
[0017] The utility model also provides a refrigeration device, comprising the outer rotor motor as mentioned above.
[0018] In the technical solution of the utility model, the stator assembly cover is arranged on the casing, the rotating shaft is fixedly connected to the casing, an installation cavity is arranged in the casing, the rotor core is interference fit with the installation cavity, so as to fix the rotor core to the inner side of the casing, the end face of the rotor core is penetrated with a plurality of tooth grooves, the connecting column of the cast aluminum part is formed in the tooth grooves, the first end ring and the second end ring are connected by the connecting column, the first end ring is located at the end of the rotor core away from the bottom of the casing, the second end ring is located at the end of the rotor core close to the bottom of the casing, and the cast aluminum part is used for conduction. In this way, the rotor core is fixed to the inner side of the casing by interference fit, which can increase the installation stability of the rotor core, and there is no need to add an additional connection structure to connect the two, so as to avoid the loosening of the connection between the rotor core and the casing due to damage of the connection structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0020] Figure 1 A cross-sectional view of an embodiment of an outer rotor motor of the utility model;
[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the rotor core and aluminum castings;
[0022] Figure 3 for Figure 2 A cross-sectional view of
[0023] Figure 4 for Figure 2 Schematic diagram of the structure of the rotor core.
[0024] Description of Figure Numbers:
[0025] Label name Label name 10 Stator assembly 101 Stator end cover 11 chassis 111 Mounting cavity 12 Rotor core 121 Tooth groove 122 Tooth 13 Rotation axis 14 Aluminum castings 141 First end ring 142 Second end ring 143 Connecting column 15 bushing 151 Mounting holes
[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0031] The utility model provides an outer rotor motor.
[0032] In one embodiment of the present invention, Figures 1 to 4 As shown, the outer rotor motor includes a stator assembly 10 and an outer rotor assembly; the outer rotor assembly includes a housing 11, a rotor core 12, a rotating shaft 13 and an aluminum casting 14, the housing 11 has an installation cavity 111, the rotor core 12 is interference fit with the installation cavity 111, the rotating shaft 13 is fixedly connected to the housing 11, and the rotating shaft 13 is rotatably connected to the stator assembly 10 after passing through the rotor core 12, a plurality of tooth slots 121 are pierced on the rotor core 12, and the plurality of tooth slots 121 are evenly spaced along the circumference of the rotor core 12; the aluminum casting 14 includes a first end ring 141, a second end ring 142 and a plurality of connecting columns 143, the connecting columns 143 are formed in the tooth slots 121 in a one-to-one correspondence, the first end ring 141 and the second end ring 142 are respectively formed at the two ends of the rotor core 12, and the two ends of the connecting column 143 are respectively connected to the first end ring 141 and the second end ring 142.
[0033] In the technical solution of the present utility model, the stator assembly 10 is covered on the casing 11, the rotating shaft 13 is fixedly connected to the casing 11, an installation cavity 111 is provided in the casing 11, the rotor core 12 is interference fit with the installation cavity 111, so as to fix the rotor core 12 to the inner side of the casing 11, a plurality of tooth grooves 121 are penetrated through the end surface of the rotor core 12, a connecting column 143 of the cast aluminum part 14 is formed in the tooth groove 121, and a first end ring 141 and a second end ring 142 are connected by the connecting column 143, the first end ring 141 is located at one end of the rotor core 12 away from the bottom of the casing 11, and the second end ring 142 is located at one end of the rotor core 12 close to the bottom of the casing 11, and the cast aluminum part 14 is used for conduction. With this arrangement, the rotor core 12 is fixed to the inner side of the casing 11 by interference fit, which can increase the installation stability of the rotor core 12 and eliminate the need for an additional connecting structure to connect the two, thereby preventing the connection between the rotor core 12 and the casing 11 from becoming loose due to damage to the connecting structure.
[0034] In one embodiment, the aluminum casting 14 is die-cast on the rotor core 12 .
[0035] Specifically, a mold is installed on the rotor core 12, and aluminum liquid is cast into the mold to die-cast the aluminum casting 14 on the rotor core 12, so that the rotor core 12 and the aluminum casting 14 are integrated. This arrangement can increase the connection stability between the rotor core 12 and the aluminum casting 14, and does not require an additional connection structure to assemble the two, and can also improve the structural strength of the rotor core 12. In some other embodiments, the aluminum casting 14 is welded to the rotor core 12.
[0036] In one embodiment, the outer circumferential wall of the second end ring 142 is spaced apart from the inner circumferential wall of the housing 11 , and the second end ring 142 is spaced apart from the bottom wall of the housing 11 .
[0037] Specifically, the second end ring 142 is arranged close to the bottom of the housing 11, and the first end ring 141 is arranged away from the bottom of the housing 11. The outer diameter of the second end ring 142 is smaller than the inner diameter of the housing 11. When the rotor core 12 is installed into the housing 11, the second end ring 142 will not interfere with the housing 11. The inner circumferential wall of the second end ring 142 is spaced apart from the stator assembly 10. This arrangement facilitates the installation of the rotor core 12 and does not hinder the placement of the rotor core 12 into the housing 11. The spacing of the second end ring 142 from the bottom wall of the housing 11 can reduce the occupation of the installation space by the cast aluminum part 14, and can reduce the overall volume of the housing 11, with lower production costs. In some other embodiments, the second end ring 142 is arranged in contact with the bottom wall of the housing 11.
[0038] In one embodiment, the material of the aluminum casting 14 is pure aluminum.
[0039] Specifically, in the related art, the aluminum casting 14 is made of aluminum alloy material. However, since the aluminum alloy material heats up quickly, when the outer rotor motor is used for a long time, it will generate heat. The temperature increase of the aluminum casting 14 will consume more energy, causing the outer rotor motor to lose kinetic energy used to drive the rotating shaft 13 to rotate, resulting in low rotation efficiency. By changing the aluminum alloy material to pure aluminum material, the speed of the rotor temperature increase can be slowed down, thereby reducing the loss of kinetic energy and improving the working efficiency of the outer rotor motor. In this embodiment, pure aluminum is used to make the aluminum casting 14, which can ensure good electrical conductivity and heat up slowly during operation, thereby reducing the power loss of the outer rotor motor when it is working.
[0040] In one embodiment, a plurality of teeth 122 are protruding from the inner circumference of the rotor core 12 , and the plurality of teeth 122 are evenly spaced along the circumferential direction. A tooth groove 121 is provided between any two adjacent teeth 122 , and the side wall of the connecting column 143 is flush with the end surface of the tooth 122 .
[0041] Specifically, there is a gap between any two adjacent teeth 122. When the aluminum casting 14 is die-cast on the rotor core 12, the inner side wall of the connecting column 143 is flush with the inner end face of the tooth 122. Each tooth 122 is arranged to extend along the axial direction of the rotor core 12. Two adjacent teeth 122 serve as the slot side walls of the tooth slot 121 respectively, and the inner peripheral wall of the rotor core 12 serves as the slot bottom wall of the tooth slot 121, together forming the tooth slot 121. A large number of tooth slots 121 can increase the connection stability between the aluminum casting 14 and the rotor core 12, and the more the number of connecting columns 143, the better the conductive effect can be produced. Such an arrangement can reduce the power loss of the outer rotor motor. In some other embodiments, in the direction from outside to inside, the tooth slot 121 is arranged close to the inner peripheral wall of the rotor core 12, but the tooth slot 121 is spaced from the inner peripheral wall.
[0042] In one embodiment, the stator assembly 10 includes a stator and a stator end cover 101. The stator is fixed to the stator end cover 101 and extends into the interior of the rotor core 12. The stator end cover 101 is covered on the casing 11. The stator and the inner circumferential wall of the rotor core 12 are spaced apart. The outer circumferential wall of the first end ring 141 is spaced apart from the inner circumferential wall of the stator end cover 101.
[0043] Specifically, the stator end cover 101 is covered on the casing 11, and the diameter of the stator end cover 101 is larger than the diameter of the casing 11. The stator extends into the casing 11 and is spaced apart from the rotating shaft 13, the cast aluminum part 14, and the rotor core 12. The inner circumferential wall of the stator end cover 101 is spaced apart from the outer circumferential wall of the casing 11. The first end ring 141 is located at one end of the rotor core 12 close to the stator end cover 101, and the first end ring 141 protrudes from the rotor core 12. The first end ring 141 extends into the stator end cover 101, and the outer diameter of the first end ring 141 is smaller than the inner diameter of the stator end cover 101. In this way, when the rotor core 12 rotates, the first end ring 141 will not contact the stator end cover 101, thereby ensuring smooth rotation.
[0044] In one embodiment, the rotor core 12 is connected to the housing 11 by hot pressing or cold pressing.
[0045] Specifically, in this embodiment, the rotor core 12 is fixed to the housing 11 by hot pressing. The outer peripheral wall of the rotor core 12 is first heated to be slightly deformed, and then the rotor core 12 is pressed into the housing 11 so that the outer peripheral wall of the rotor core 12 abuts against the inner peripheral wall of the housing 11. After cooling, the rotor core 12 and the housing 11 are fixed. This arrangement can improve the connection stability between the rotor core 12 and the housing 11. In some other embodiments, the rotor core 12 is welded to the housing 11.
[0046] In one embodiment, a bushing 15 is disposed at the bottom of the housing 11 . The bushing 15 extends into the housing 11 . The bushing 15 has a mounting hole 151 . The rotating shaft 13 is fixedly inserted into the mounting hole 151 .
[0047] Specifically, the bushing 15 is fixed to the bottom of the casing 11, and part of the bushing 15 extends into the interior of the casing 11. The rotating shaft 13 is inserted into the mounting hole 151 of the bushing 15. In this embodiment, a bearing is sleeved on the rotating shaft 13, and the stator assembly 10 has a rotating cavity. The rotating cavity is provided with a mounting protrusion for bearing installation. The bushing 15 is used to press one of the bearings against the mounting protrusion. The rotating shaft 13 is interference fit with the mounting hole 151. Such a setting can reduce the wear and vibration of the rotating shaft 13.
[0048] In one embodiment, a stepped hole is provided at the bottom of the housing 11 , the shape of the bushing 15 is adapted to the shape of the stepped hole, the bushing 15 is fixedly inserted in the stepped hole, and the end surface of the bushing 15 is flush with the bottom wall of the housing 11 .
[0049] Specifically, the bottom of the housing 11 is concave to form a stepped hole, the width of the stepped surface is greater than the diameter of the middle hole, the bushing 15 is adapted to be arranged in a convex shape, a portion of the bushing 15 abuts against the stepped surface to limit the axial movement of the bushing 15, and the end surface of the bushing 15 away from the stator assembly 10 is arranged flush with the bottom wall of the housing 11, so that the bottom of the housing 11 is flat and has no protruding parts. This arrangement can increase the installation stability of the bushing 15, and the volume of the outer rotor assembly is small. In some other embodiments, the bushing 15 is embedded in the stepped hole.
[0050] In one embodiment, the outer peripheral wall of the bushing 15 is welded to the inner peripheral wall of the step hole.
[0051] Specifically, welding is performed at the connection gap between the bushing 15 and the stepped hole, and the outer peripheral wall of the bushing 15 is welded to the inner peripheral wall of the stepped hole, so that the installation stability of the bushing 15 on the stepped hole can be increased. In some other embodiments, the bushing 15 is bonded to the stepped hole.
[0052] The utility model also proposes a refrigeration device, which can be divided into compression refrigeration equipment, absorption refrigeration equipment, steam jet refrigeration equipment, heat pump refrigeration equipment and electric heating refrigeration device. The refrigeration equipment mainly includes a compressor, an expansion valve, an evaporator, a condenser and accessories, pipelines, and an outer rotor motor. Such as a refrigerator, an air conditioner, etc. The specific structure of the outer rotor motor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.
[0053] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. An outer rotor motor, characterized in that: include: Stator assembly; as well as An outer rotor assembly, comprising a housing, a rotor core, a rotating shaft and an aluminum casting, wherein the housing has a mounting cavity, the rotor core is interference-fitted with the mounting cavity, the rotating shaft is fixedly connected to the housing, and the rotating shaft is rotatably connected to the stator assembly after passing through the rotor core, and a plurality of tooth slots are formed on the rotor core, and the plurality of tooth slots are evenly spaced along the circumference of the rotor core; The aluminum casting includes a first end ring, a second end ring and a plurality of connecting columns, the connecting columns are formed in the tooth grooves one by one, the first end ring and the second end ring are respectively formed at the two ends of the rotor core, and the two ends of the connecting column are respectively connected to the first end ring and the second end ring.
2. The outer rotor motor according to claim 1, characterized in that: The aluminum casting is die-cast on the rotor core.
3. The outer rotor motor according to claim 1, characterized in that: The outer peripheral wall of the second end ring is spaced apart from the inner peripheral wall of the housing, and the second end ring is spaced apart from the bottom wall of the housing.
4. The outer rotor motor according to claim 1, characterized in that: The material of the aluminum casting is pure aluminum.
5. The outer rotor motor according to claim 1, characterized in that: The inner circumference of the rotor core is convexly provided with a plurality of teeth, the plurality of teeth are evenly spaced along the circumferential direction, a tooth groove is provided between any two adjacent teeth, and the side wall of the connecting column is flush with the end surface of the teeth.
6. The outer rotor motor according to claim 1, characterized in that: The stator assembly includes a stator and a stator end cover, wherein the stator is fixed to the stator end cover and extends into the interior of the rotor core, the stator end cover is covered on the casing, the stator is spaced apart from the inner circumferential wall of the rotor core, and the outer circumferential wall of the first end ring is spaced apart from the inner circumferential wall of the stator end cover.
7. The outer rotor motor according to claim 1, characterized in that: The rotor core is connected to the casing by hot pressing or cold pressing.
8. The outer rotor motor according to claim 1, characterized in that: A bushing is provided at the bottom of the casing, the bushing extends into the casing, the bushing has a mounting hole, and the rotating shaft is fixedly inserted into the mounting hole.
9. The outer rotor motor according to claim 8, characterized in that: A stepped hole is provided at the bottom of the casing, the shape of the bushing is adapted to the shape of the stepped hole, the bushing is fixedly inserted in the stepped hole, and the end surface of the bushing is flush with the bottom wall of the casing.
10. The outer rotor motor according to claim 9, characterized in that: The outer peripheral wall of the bushing is welded to the inner peripheral wall of the step hole.
11. A refrigeration device, characterized in that: The invention comprises an outer rotor motor as claimed in any one of claims 1 to 10.