A type of motor

Abstract

This utility model relates to the technical field of electric motors, and more particularly to an electric motor comprising: a housing, a front end cover and a rear end cover respectively connected to both ends of the housing, a stator assembly connected within the housing, and a rotor assembly fitted by the stator assembly. The stator assembly includes a stator core, and the stator core includes a yoke. Stator teeth are evenly distributed on the inner side of the yoke. Stator slots for fixing three-phase windings are formed between adjacent stator teeth. Stator tooth shoes are provided at the ends of the stator teeth. A stator slot opening is formed between two adjacent stator teeth and between adjacent stator tooth shoes. The stator slot opening communicates with the stator slot. The width of the stator slot opening is A, and the relationship in the stator core is: A = 2a + b + 0.6 mm; where a is the wire diameter used for the three-phase windings, and b is the wire tip thickness. This motor, by limiting the size of the stator slot opening of the stator core, ensures its adaptability to automated multi-winding processes, thereby reducing the cost of motor production and improving production efficiency.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and more particularly to an electric motor. Background Technology

[0002] As people's living standards improve, more and more enthusiasts are getting involved with RC model cars. With the improvement of players' skills, the demands on the power systems of RC models, specifically the DC brushless motors, are also increasing. Currently, the market has a greater need for more extreme and powerful motors, so these motors are developing towards higher power and higher speeds. Correspondingly, the electromagnetic structure design of the stator and rotor, the core components of the motor, is also facing higher requirements.

[0003] Most existing RC model car drive motors use surface-mounted magnetic tile rotor structures. This approach can achieve high air gap magnetic flux density, but the magnetic tiles are bulky, consume a lot of rare earth elements, and are not cost-effective. Furthermore, the air gap magnetic field formed by the magnetic tiles is a trapezoidal wave, resulting in poor cogging torque and smooth operation, which in turn affects the motor's performance.

[0004] In addition, RC drive motors typically prioritize high speed and high power density. To achieve optimal performance and slot fill factor, manual winding is often used to increase the slot fill factor. However, this also leads to high production costs and difficulties in automation. This is especially true for car model motors with an outer diameter of less than 40mm, which require high speeds, usually above 40,000rpm, and have a low number of turns, typically less than 4. This results in a large number of parallel windings. If manual winding is used, this type of motor is not advantageous in terms of cost or production efficiency. Utility Model Content

[0005] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide a motor whose structure is conducive to realizing automated assembly of stator and rotor, thereby improving production efficiency.

[0006] This utility model provides an electric motor, including a housing, a front end cover and a rear end cover connected to both ends of the housing, a stator assembly connected within the housing, and a rotor assembly fitted by the stator assembly. The stator assembly includes a stator core, and the stator core includes a yoke. Stator teeth are evenly distributed on the inner side of the yoke. Stator slots for fixing three-phase windings are formed between adjacent stator teeth. Stator tooth shoes are provided at the ends of the stator teeth. A stator slot opening is formed between two adjacent stator teeth and their adjacent stator tooth shoes. The stator slot opening communicates with the stator slot. The width of the stator slot opening is A, and A = 2a + b + 0.6 mm exists in the stator core, where a is the wire diameter used in the three-phase windings and b is the wire tip thickness.

[0007] Preferably, the stator tooth shoe has an arc-shaped structure, and the opening angle β of the stator tooth shoe is 110°; the width B of the yoke is 50%-55% of the width C of the stator tooth.

[0008] Preferably, the stator assembly further includes insulating slot covers connected to both ends of the stator core, insulating slot paper connected in the stator slot, and the three-phase winding;

[0009] The stator core has six stator slots evenly distributed circumferentially, and the different stator slots are numbered sequentially from the first stator slot to the sixth stator slot along the circumferential direction. The three-phase winding includes:

[0010] Phase A winding is provided with two parallel branches, and the branches of Phase A winding are respectively embedded in the first stator slot and the fourth stator slot;

[0011] The B-phase winding has two parallel branches, which are respectively embedded in the second stator slot and the fifth stator slot.

[0012] The C-phase winding has two parallel branches, which are respectively embedded in the third stator slot and the sixth stator slot.

[0013] The three-phase winding is formed by connecting the A-phase winding, the B-phase winding, and the C-phase winding in a delta configuration.

[0014] Preferably, the three-phase winding harness includes ten wires arranged in parallel; wherein, along the circumferential direction of the stator core, the harness is arranged in parallel with two wires as a group; and along the radial direction of the stator core, the wires are arranged in parallel with five wires as a group.

[0015] Preferably, the motor further includes a three-phase output assembly, which is connected to the A-phase winding, the B-phase winding, and the C-phase winding.

[0016] Preferably, the stator gear shoe surrounds and forms a receiving cavity, and the rotor assembly is located in the receiving cavity; the rotor assembly includes a rotor core, and the outer periphery of the rotor core is recessed inward to form a magnet mounting groove, the bottom of the magnet mounting groove is provided with a glue-hiding groove, and an eccentric bread tile is glued to the magnet mounting groove.

[0017] Preferably, the distance between the outer diameter of the rotor core and the bottom of the magnet mounting slot is H1, and the distance between the outer diameter of the eccentric bread-shaped magnetic tile and the bottom of the magnet mounting slot is H2. The following relationship exists in the rotor assembly:

[0018] Preferably, a corner platform is provided on the outer periphery of the rotor core, and the corner platform is connected to the end point of the slot opening of the adjacent magnet mounting slot; the circumcircle of the corner platform and the circumcircle of the eccentric bread tile are eccentric arcs.

[0019] Preferably, the rotor assembly includes a connecting shaft passing through both ends of the rotor core and rotor end plates disposed at both ends of the rotor core, wherein the rotor end plates and the rotor core are interference-fitted to the connecting shaft.

[0020] Preferably, both the front end cover and the rear end cover are provided with bearings, and the two ends of the connecting shaft are respectively connected to the front end cover and the rear end cover through the bearings.

[0021] The motor of this utility model has the following technical effects:

[0022] This invention relates to a motor that limits the size of the stator slots, particularly the stator core, to ensure compatibility with automated multi-strand winding processes. This reduces production costs and increases efficiency. Furthermore, the three-phase windings are embedded in six slots and employ a two-way parallel, delta connection. This allows the left-side teeth and right-side teeth within the same stator slot to be connected as a single phase, eliminating the need to differentiate between different phase windings. This simplifies the handling of wire ends from different phase windings and facilitates automatic handling of bridging wires during multi-strand winding, further enhancing automation efficiency.

[0023] Furthermore, the motor of this invention optimizes the structural relationship between the rotor core and the eccentric bread-shaped magnetic tiles, optimizes the rotor pole arc coefficient, improves the magnet utilization rate, and also makes the air gap size sinusoidal, optimizes the air gap magnetic field waveform, thereby optimizing the back EMF waveform and improving the overall performance of the motor. Attached Figure Description

[0024] Figure 1 This is an exploded view of the motor provided in Embodiment 1 of this application;

[0025] Figure 2 This is an exploded view of the stator assembly provided in Embodiment 1 of this application;

[0026] Figure 3 This is a schematic diagram of the stator core structure provided in Embodiment 1 of this application;

[0027] Figure 4 This is a schematic cross-sectional view of the stator core provided in Embodiment 1 of this application;

[0028] Figure 5 This is a schematic diagram of the structure of the wire nozzle provided in Embodiment 1 of this application;

[0029] Figure 6This is one of the structural schematic diagrams of the stator core and three-phase windings provided in Embodiment 1 of this application;

[0030] Figure 7 This is a second schematic diagram of the structure between the stator core and the three-phase windings provided in Embodiment 1 of this application;

[0031] Figure 8 This is an exploded view of the rotor assembly provided in Embodiment 1 of this application;

[0032] Figure 9 An exploded view of the rotor core and eccentric bread-shaped magnetic tile provided in Embodiment 1 of this application;

[0033] Figure 10 This is a schematic diagram of the rotor core provided in Embodiment 1 of this application;

[0034] Figure 11 This is a schematic diagram of the assembly of the rotor core and the eccentric bread-shaped magnetic tile provided in Embodiment 1 of this application;

[0035] Figure 12 This is a cross-sectional schematic diagram of the assembly of the stator assembly and the rotor assembly provided in Embodiment 1 of this application.

[0036] Figure label:

[0037] 1. Front cover;

[0038] 2. Housing;

[0039] 3. Stator assembly; 310. Stator core; 311. Yoke; 312. Stator teeth; 313. Stator tooth shoe; 314. Stator slot; 315. Mounting slot; 320. Insulating slot cover; 321. Clip; 330. Insulating slot paper; 340. Three-phase winding; 350. Stator slot; 31. First stator slot; 32. Second stator slot; 33. Third stator slot; 34. Fourth stator slot; 35. Fifth stator slot; 36. Sixth stator slot; 37. Phase A winding; 38. Phase B winding; 39. Phase C winding;

[0040] 4. Rotor assembly; 41. Rotor core; 42. Magnet mounting slot; 43. Glue-encapsulated slot; 44. Eccentric bread-shaped magnet; 45. Corner platform; 46. Connecting shaft; 47. Connecting shaft mounting slot; 48. Rotor end plate;

[0041] 5. Rear end cover;

[0042] 6. Three-phase outgoing line assembly;

[0043] 7. Thread tip;

[0044] 8. Wires. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0047] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0048] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0049] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0050] In the embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0051] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0052] Please refer to the reference. Figures 1 to 12 This embodiment provides a motor that enables automated assembly of the stator, rotor, and the entire machine, and improves the utilization rate of the rotor magnets, thus offering the advantage of high performance.

[0053] Specifically, such as Figure 1 As shown, the motor includes a housing 2, a front cover 1 and a rear cover 5 connected to both ends of the housing 2, a stator assembly 3 connected inside the housing 2, and a rotor assembly 4 fitted by the stator assembly 3.

[0054] like Figures 2 to 5 As shown, the stator assembly 3 includes a stator core 310, which includes a cylindrical yoke 311. Protruding stator teeth 312 are evenly distributed circumferentially on the inner side of the yoke 311. Stator slots 350 for fixing the three-phase winding 340 are formed between adjacent stator teeth 312. A stator tooth shoe 313 is provided at the end of each stator tooth 312, i.e., the end of the stator tooth 312 away from the yoke 311. In this embodiment, the stator tooth shoe 313 and the stator tooth 312 are radially symmetrical. A stator slot opening 314 is formed between adjacent stator tooth shoes 313, and the stator slot opening 314 communicates with the stator slot 350. The width of the stator slot 314 is A. To ensure automated assembly of the motor, the following relationship exists in the stator core 310: A = 2a + b + 0.6 mm, where a is the wire diameter of the conductor 8 used in the three-phase winding 340, and b is the thickness of the wire nozzle 7. The wire nozzle 7 is an important component used to guide the conductor 8 to the stator core 310. In this embodiment, the value of a ranges from 0.1 to 0.5 mm, and the value of b ranges from 0.3 to 0.5 mm. The width of the stator slot 314 is matched with the size of the wire nozzle 7 to achieve automated assembly, improve the production efficiency of the motor, and reduce the production cost of the motor, thereby facilitating the formation of windings using multiple conductors 8. It should be noted that in other embodiments, the value range of a can be determined according to the winding parameters, and the value range of b can be determined according to the winding tension.

[0055] Furthermore, to improve the performance of the motor, this embodiment also specifies other structural parameters of the stator core 310. Specifically, the stator tooth shoe 313 is an arc-shaped structure curved outwards from the stator core 310, and the opening angle β of the stator tooth shoe 313 is 110°. Additionally, the width B of the yoke 311 is 50%-55% of the width C of the stator tooth 312.

[0056] The stator assembly 3 also includes an insulating slot cover 320, an insulating slot paper 330, and a three-phase winding 340, each connected to both ends of the stator core 310. The insulating slot paper 330 is structured to fit within the stator slot 350. Simultaneously, the insulating slot cover 320 is snapped onto the outside of the stator core 310 to achieve insulation of the stator core 310. In this embodiment, the outer periphery of the stator core 310 has an axially extending mounting groove 315. The insulating slot cover 320 has three evenly distributed clips 321, which are inserted into the mounting groove 315 to achieve installation between the insulating slot cover 320 and the stator core 310. The three-phase winding 340 is wound onto the stator core 310 by machine.

[0057] Please refer to the reference. Figures 2 to 7 The stator core 310 has six stator slots 350 evenly distributed circumferentially, numbered sequentially from stator slot 31 to stator slot 36. The three-phase winding 340 includes an A-phase winding 37, a B-phase winding 38, and a C-phase winding 39. Each single-phase winding has two branches connected in parallel. The three-phase winding 340 is formed by a delta connection of the A-phase winding 37, B-phase winding 38, and C-phase winding 39. Please refer to [reference needed] for details. Figure 4 The two branches of phase A winding 37 are respectively embedded in the first stator slot 31 and the fourth stator slot 34; the two branches of phase B winding 38 are respectively embedded in the second stator slot 32 and the fifth stator slot 35; and the two branches of phase C winding 39 are respectively embedded in the third stator slot 33 and the sixth stator slot 36, thus facilitating the formation of a six-slot, four-pole motor. This arrangement allows the left-side tooth exit wire and the right-side tooth entry wire in each stator slot 350 to be combined into the same phase, saving the steps of distinguishing different phase windings, simplifying the winding wire end sorting process, facilitating the automatic sorting of the bridging wire when multiple strands are wound in parallel, further adapting to automated motor assembly engineering, and improving assembly efficiency.

[0058] Furthermore, to meet the requirements of high-performance motor and ease of automated assembly, this embodiment also specifies the structure of the wire harness in the three-phase winding 340. (See relevant references.) Figure 5 During the winding process, the wire harness includes ten wires 8 arranged side-by-side inside the wire nozzle 7. Within the wire nozzle 7, along the circumferential direction of the stator core 310, the wire harness is arranged in groups of two wires 8; along the radial direction of the stator core 310, the wires 8 are arranged in groups of five wires 8. It should be noted that the dimension of the wire nozzle 7, i.e., its thickness b, is along the direction in which two wires 8 are arranged side-by-side. Figure 5 As shown, the sidewalls on the left and right sides of the wire nozzle 7 are thinner to ensure that the wire nozzle 7 can enter the stator slot 314; the sidewalls on the top and bottom sides of the wire nozzle 7 are thicker to ensure the strength of the wire nozzle 7. The wire harness is arranged in multiple rows and cooperates with the wire nozzle 7 to facilitate wire feeding.

[0059] Please refer to the reference. Figure 1 , Figure 2 , Figure 6 and Figure 7 The motor also includes a three-phase output assembly 6, which includes three sets of conductive structures. Different conductor structures 8 are respectively connected to the ends of the A-phase winding 37, B-phase winding 38 and C-phase winding 39. The three-phase output assembly 6 is used to realize the connection between the motor and the external system.

[0060] Reference Figure 1 , Figures 8 to 12 The stator gear shoe 313 surrounds and forms a receiving cavity, within which the rotor assembly 4 is located. The rotor assembly 4 includes a rotor core 41. A magnet mounting groove 42 is formed by an inwardly recessed section on the outer periphery of the rotor core 41. A glue-sealing groove 43 is provided at the bottom of the magnet mounting groove 42, and an eccentrically bonded magnetic tile 44 is mounted on the magnet mounting groove 42. In this embodiment, the rotor core 41 is approximately rectangular, and the magnet mounting groove 42 is located on its four outer sidewalls. The bottom of the magnet mounting groove 42, i.e., the sidewall of the magnet mounting groove 42 closest to the center of the rotor core 41, has two axially extending glue-sealing grooves 43 at each bottom. This structure optimizes the rotor pole arc coefficient and improves the utilization rate of the eccentrically bonded magnetic tile 44.

[0061] Furthermore, the distance between the outer diameter of the rotor core 41 and the bottom of the magnet mounting groove 42 is H1, and the distance between the outer diameter of the eccentric bread magnet 44 and the bottom of the magnet mounting groove 42 is H2. The following relationship exists in the rotor assembly 4: It helps to prevent magnetic leakage.

[0062] Furthermore, a corner platform 45 is provided on the outer periphery of the rotor core 41, and the corner platform 45 connects to the edge endpoint of the slot of the adjacent magnet mounting slot 42. In this embodiment, the sidewall of the corner platform 45 on the outer periphery of the rotor core 41 is a straight wall. The circumcircle of the corner platform 45 and the circumcircle of the eccentric bread magnetic tile 44 are separated by an eccentric arc, making the air gap size sinusoidal, optimizing the air gap magnetic field waveform, thereby optimizing the back EMF waveform and improving the performance of the motor.

[0063] The rotor assembly 4 also includes a connecting shaft 46 passing through both ends of the rotor core 41 and rotor end plates 48 respectively disposed at both ends of the rotor core 41. The rotor end plates 48 and the rotor core 41 are interference-fitted to the connecting shaft 46. The rotor core 41 has a connecting shaft mounting groove 47 penetrating through it in the center, and the connecting shaft 46 passes through and is connected to the connecting shaft mounting groove 47. In this embodiment, the connecting shaft 46 is a stepped shaft. Meanwhile, both the front cover 1 and the rear cover 5 are provided with bearings, and the two ends of the connecting shaft 46 are connected to the front cover 1 and the rear cover 5 through the bearings, thereby enabling the rotor assembly 4 and the stator assembly 3 to be installed between the housing 2, the front cover 1, and the rear cover 5. It should be noted that the front cover 1 and the rear cover 5 are fastened to the housing 2 with screws.

[0064] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An electric motor, comprising a housing, a front cover and a rear cover respectively connected to both ends of the housing, a stator assembly connected within the housing, and a rotor assembly sleeved by the stator assembly, characterized in that, The stator assembly includes a stator core, which includes a yoke. Stator teeth are evenly distributed on the inner side of the yoke. Stator slots for fixing the three-phase windings are formed between adjacent stator teeth. Stator tooth shoes are provided at the ends of the stator teeth. A stator slot opening is formed between two adjacent stator teeth and between adjacent stator tooth shoes. The stator slot opening communicates with the stator slot. The width of the stator slot opening is A. In the stator core, there exists the relationship: A = 2a + b + 0.6 mm; where a is the wire diameter used in the three-phase windings and b is the wire tip thickness.

2. The electric machine of claim 1, wherein, The stator tooth shoe has an arc-shaped structure, and the opening angle β of the stator tooth shoe is 110°; the width B of the yoke is 50%-55% of the width C of the stator tooth.

3. The electric machine of claim 1, wherein, The stator assembly also includes insulating slot covers connected to both ends of the stator core, insulating slot paper connected to the stator slots, and the three-phase windings. The stator core has six stator slots evenly distributed circumferentially, and the different stator slots are numbered sequentially from the first stator slot to the sixth stator slot along the circumferential direction. The three-phase winding includes: Phase A winding is provided with two parallel branches, and the branches of Phase A winding are respectively embedded in the first stator slot and the fourth stator slot; The B-phase winding has two parallel branches, which are respectively embedded in the second stator slot and the fifth stator slot. The C-phase winding has two parallel branches, which are respectively embedded in the third stator slot and the sixth stator slot. The three-phase winding is formed by connecting the A-phase winding, the B-phase winding, and the C-phase winding in a delta configuration.

4. The electric machine of claim 3, wherein, The three-phase winding harness includes ten conductors arranged in parallel; wherein, along the circumferential direction of the stator core, the harness is arranged in parallel with two conductors as a group; and along the radial direction of the stator core, the conductors are arranged in parallel with five conductors as a group.

5. The electric machine of claim 3, wherein, The motor also includes a three-phase output assembly, which is connected to the A-phase winding, the B-phase winding, and the C-phase winding.

6. The electric machine of any of claims 1-5, wherein, The stator gear shoe surrounds and forms a receiving cavity, and the rotor assembly is located in the receiving cavity; the rotor assembly includes a rotor core, and the outer periphery of the rotor core is recessed inward to form a magnet mounting groove. The bottom of the magnet mounting groove is provided with a glue-hiding groove, and an eccentric bread tile is glued to the magnet mounting groove.

7. The electric machine of claim 6, wherein, The distance between the outer diameter of the rotor core and the bottom of the magnet mounting groove is H1, the distance between the outer diameter of the eccentric surface bag magnet tile and the bottom of the magnet mounting groove is H2, and in the rotor assembly, there is a relationship:

8. The electric machine of claim 7, wherein, A corner platform is provided on the outer periphery of the rotor core, and the corner platform is connected to the edge end of the slot of the adjacent magnet mounting slot; the circumcircle of the corner platform and the circumcircle of the eccentric bread magnetic tile are eccentric arcs.

9. The electric machine of claim 8, wherein, The rotor assembly includes a connecting shaft passing through both ends of the rotor core and rotor end plates disposed at both ends of the rotor core, wherein the rotor end plates and the rotor core are interference-fitted to the connecting shaft.

10. The electric machine of claim 9, wherein, Both the front end cover and the rear end cover are equipped with bearings, and the two ends of the connecting shaft are respectively connected to the front end cover and the rear end cover through the bearings.

Images