Brushless motor

Abstract

The utility model discloses a kind of brushless motor, first installation groove and second installation groove of interval setting are opened on magnetic shell, excitation winding is arranged in second installation groove, and section stack is arranged in first installation groove. Therefore, heat pipe can be aimed at the section group in the same first installation groove and heat dissipation, effectively improve the cooling efficiency of armature winding. On the other hand, the section of heat pipe is configured as rectangular structure, increase the heat dissipation area between heat dissipation part and stator, also can improve the flow of heat dissipation liquid. At the same time, the radial setting of first edge rotor makes multiple heat pipes arrange around rotor. The consistency of the heat dissipation efficiency of heat dissipation part to each area of stator is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a brushless motor. Background Technology

[0002] The simultaneous installation of armature windings and field windings in a motor generates superimposed magnetic fields during operation, driving the rotor to rotate. This eliminates the need for permanent magnets on the stator, saving stator space. However, both armature and field windings also generate considerable heat. Preventing overheating of the motor becomes a problem that needs to be addressed. Utility Model Content

[0003] In view of this, the present invention provides a brushless motor in which the heat sink and armature winding are arranged in a first mounting slot, and the cross-section of the heat sink is configured as rectangular to increase the heat dissipation area of ​​the heat sink and the stator.

[0004] The brushless motor of this utility model embodiment includes:

[0005] Rotor;

[0006] The stator includes a magnetic housing, multiple armature windings, and multiple excitation windings. The magnetic housing has multiple first mounting slots and multiple second mounting slots arranged around the rotor. The first mounting slots and second mounting slots are separated in the circumferential direction of the rotor. The excitation windings are disposed in the second mounting slots. The armature windings include windings, and the windings include multiple spaced segments in their extending direction. The multiple segments form multiple segment groups, and the multiple segment groups are respectively disposed in the multiple first mounting slots.

[0007] The heat dissipation section includes a plurality of heat dissipation pipes corresponding to at least a portion of a plurality of first mounting slots. The heat dissipation pipes pass through the corresponding first mounting slots, and in the cross-sectional direction of the stator axial direction, the outer contour of the heat dissipation pipes is a first rectangle with adjacent sides of unequal length. The first rectangle includes two first sides, the first sides being the longer sides. The two first sides of each first rectangle are parallel and extend radially along the rotor, and the plurality of segments of each segment group are stacked along the extension direction of the first side.

[0008] Furthermore, in the cross-sectional direction along the stator axial direction, the outer contour of the segment is a second rectangle, and the adjacent sides of the second rectangle are of unequal length;

[0009] The long side of the first rectangle and the short side of the second rectangle extend radially along the rotor.

[0010] Furthermore, the first side is the long side, and one of the first sides of the heat dissipation pipe abuts against the inner wall of the first mounting groove, while the other first side abuts against the short side of the plurality of second rectangles.

[0011] Furthermore, the brushless motor has three or six phases;

[0012] The number of the plurality of first mounting slots is M, and the rotor includes N protruding teeth, wherein M / N = 1.5, and M and N are both positive integers.

[0013] Furthermore, the excitation winding is wound around the two second mounting slots;

[0014] The segment group and the heat dissipation pipe located in the same first mounting slot form an armature unit. Multiple armature units form multiple first armature units, multiple second armature units, and multiple third armature units. The second armature unit is located between the first armature unit and the third armature unit. The second armature unit, together with the adjacent first armature unit, the third armature unit, and an excitation winding, form a stator phase. The first armature unit, the second armature unit, and the third armature unit of each stator phase are arranged sequentially in the same direction.

[0015] In the same stator phase, the two second mounting slots corresponding to the same excitation winding are located on both sides of the first armature unit and the third armature unit, respectively.

[0016] Furthermore, the magnetic housing has a receiving hole for accommodating the rotor;

[0017] The first mounting slot includes a first receiving chamber and a second receiving chamber connected to each other. One side of the first receiving chamber is connected to the receiving hole. A pole tooth is formed between two adjacent first receiving chambers. At least a portion of the segment group is disposed in the first receiving chamber. The heat dissipation pipe is disposed in the first receiving chamber or the second receiving chamber.

[0018] The second mounting groove is disposed on the pole tooth and is located radially on the rotor between the receiving hole and the second receiving chamber.

[0019] Furthermore, in the cross-sectional direction along the stator axial direction, the cross-sections of the first accommodating chamber and the second accommodating chamber form a rectangular cavity, and the segment group and the heat dissipation pipe abut against the inner wall of the rectangular cavity.

[0020] Furthermore, the segment group of the first mounting slot is disposed in the first receiving chamber, and the heat dissipation pipe is disposed in the second receiving chamber;

[0021] In the circumferential direction of the rotor, the two heat dissipation pipes and the two second mounting slots are located on opposite sides of two adjacent stator phases.

[0022] Furthermore, the plurality of stator phases includes a plurality of first stator phases and a plurality of second stator phases;

[0023] Each segment of the armature unit includes a first part and a second part, wherein the first part is farther away from the rotor relative to the second part;

[0024] In the first stator phase, the segments of the first armature unit and the second armature unit are both disposed in the first accommodating chamber, and the heat dissipation pipe is disposed in the second accommodating chamber. The second part of the third armature unit and the heat dissipation pipe are disposed in the first accommodating chamber, and the first part is disposed in the second accommodating chamber.

[0025] In the second stator phase, the first armature unit and the second part of the second armature unit and the heat dissipation pipe are disposed in the first accommodating chamber, the first part is disposed in the second accommodating chamber, the segment group of the third armature unit is disposed in the first accommodating chamber, and the heat dissipation pipe is disposed in the second accommodating chamber;

[0026] The first stator phase and the second stator phase are alternately arranged in the circumferential direction of the rotor.

[0027] Furthermore, in the same stator phase, the two second accommodating chambers of the first armature unit and the third armature unit are located far apart from each other, and the second accommodating chamber of the second armature unit is close to the third armature unit;

[0028] In the circumferential direction of the rotor, the two second mounting slots are located on opposite sides of two adjacent stator phases, and the heat dissipation pipes located in the same first accommodating chamber as the first portion are disposed away from the rotor;

[0029] In the first stator phase, the first part of the second armature unit is in the same armature winding as the first part of the first armature unit, and the second part of the second armature unit is in the same armature winding as the second part of the third armature unit. At the same time, the second part of the first armature unit is in the same armature winding as the second part of the third armature unit of the adjacent second stator phase, and the first part of the third armature unit is in the same armature winding as the first part of the first armature unit of the adjacent second stator phase.

[0030] In the second stator phase, the second part of the second armature unit and the second part of the first armature unit are in the same armature winding, and the first part of the second armature unit and the first part of the third armature unit are in the same armature winding.

[0031] Furthermore, the number of segments in the first part is multiple and is consistent with the number of segments in the second part.

[0032] The brushless motor of this embodiment features a first mounting slot and a second mounting slot spaced apart on the magnetic housing. The excitation winding is positioned in the second mounting slot, and the segments are stacked in the first mounting slot. This allows the heat sinks to dissipate heat from the segments located in the same first mounting slot, effectively improving the cooling efficiency of the armature winding. Furthermore, configuring the heat sink cross-section as a rectangular structure increases the heat dissipation area between the heat sink and the stator, and also increases the flow rate of the coolant. Simultaneously, the first edge is arranged radially along the rotor, causing multiple heat sinks to be arranged around the rotor. This improves the consistency of heat dissipation efficiency across different areas of the stator. Attached Figure Description

[0033] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0034] Figure 1 This is a cross-sectional schematic diagram of the brushless motor provided in the first embodiment of this utility model;

[0035] Figure 2 This is a cross-sectional schematic diagram of the stator provided in the first embodiment of this utility model;

[0036] Figure 3 This is a cross-sectional schematic diagram of the brushless motor provided in the second embodiment of this utility model;

[0037] Figure 4 This is a partial schematic diagram of the brushless motor provided in the first embodiment of this utility model;

[0038] Figure 5 This is a partial schematic diagram of the brushless motor provided in the second embodiment of this utility model;

[0039] Figure 6 This is an exploded view of the brushless motor according to an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Heat dissipation section;

[0042] 11-Heat pipe; 111-First side; 112-Second side;

[0043] 2-Stator;

[0044] 21-Magnetic housing; 211-First mounting slot; 2111-First receiving chamber; 2112-Second receiving chamber; 212-Second mounting slot; 213-Receiving hole; 214-Pole tooth;

[0045] 22-Armature winding;

[0046] 23 - Excitation winding;

[0047] 241 - Section; 242 - Section Group;

[0048] 3-Rotor;

[0049] 31-convex tooth;

[0050] 4-Armature unit;

[0051] 5-Stator phase;

[0052] 51-First stator phase; 52-Second stator phase;

[0053] 61 - Part One; 62 - Part Two;

[0054] 7-Connectors;

[0055] 71-Transition section;

[0056] 81-First armature unit; 82-Second armature unit; 83-Third armature unit. Detailed Implementation

[0057] The present invention will now be described based on embodiments, but it is not limited to these embodiments. In the following detailed description of the present invention, certain specific details are described in detail. Those skilled in the art will fully understand the present invention even without these details. To avoid obscuring the essence of the present invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0058] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0059] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0060] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0061] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] For ease of explanation, spatially related terms such as “inside,” “outside,” “below,” “below,” “lower,” “above,” “upper,” etc., are used herein to describe the relationship between one element or feature illustrated in the figure and another. It will be understood that spatially related terms may be intended to encompass different orientations of the device in use or operation besides those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “below” another element or feature would then be positioned “above” that other element or feature. Thus, the exemplified term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptive terms used herein should be interpreted accordingly.

[0063] Figure 1 This is a schematic cross-sectional view of the brushless motor along the axial direction provided in the first embodiment. Figure 2 This is a schematic cross-sectional view of the stator 2 along the axial direction provided in the first embodiment. Figure 3 This is a schematic cross-sectional view of the brushless motor along the axial direction provided in the second embodiment.

[0064] In some implementations, such as Figures 1-3As shown, the brushless motor in this embodiment includes a heat dissipation unit 1, a stator 2, and a rotor 3. The stator 2 includes a magnetic housing 21, multiple armature windings 22, and multiple excitation windings 23. The magnetic housing 21 is also known as the stator core. The magnetic housing 21 has multiple first mounting slots 211 and multiple second mounting slots 212 arranged around the rotor 3. The multiple first mounting slots 211 and multiple second mounting slots 212 extend parallel to the axial direction of the stator 2, and the first mounting slots 211 and the second mounting slots 212 are recessed in a direction away from the rotor 3. In the circumferential direction of the rotor 3, the first mounting slots 211 and the second mounting slots 212 are separated. The excitation windings 23 are disposed in the second mounting slots 212, and the armature windings 22 are disposed in the first mounting slots 211. The armature windings 22 include windings wound on the first mounting slots 211.

[0065] Figure 4 This is a partial schematic diagram of the brushless motor provided in the first embodiment. Figure 5 This is a partial schematic diagram of the brushless motor provided in the second embodiment. Figure 6 This is an exploded view of the brushless motor in an embodiment. Figure 4 and Figure 5 The diagram shows the winding method of the armature winding 22 and the excitation winding 23 at the location of stator phase 5. Figure 6 The image shows a connector 7 for the armature winding 22.

[0066] Specifically, such as Figure 6 As shown, the armature winding 22 in this embodiment includes multiple connectors 7. Each connector 7 can be configured as a hairpin. Each connector 7 includes two sections 241 and a transition section 71 connecting the two sections 241. When the connector 7 is inserted into the magnetic housing 21 from one end of the two first mounting slots 211, the end of each section 241 protrudes from the other end of the first mounting slot 211. After twisting this end, the ends of adjacent sections 241 can be connected together by laser welding to form multiple independent armature windings 22. Further referencing... Figures 4-5 As shown in the figure, the transition section 71 connecting the two first mounting slots 211 is shown by dashed lines.

[0067] In some implementations, such as Figures 4-5As shown, the winding includes multiple segments 241 spaced apart in the extending direction. This winding can be enameled wire, i.e., copper wire with an insulating coating on the outside. Multiple segments 241 are stacked to form multiple segment groups 242. Multiple segment groups 242 are respectively disposed in multiple first mounting slots 211. The heat dissipation unit 1 includes multiple heat dissipation pipes 11 corresponding to at least a portion of the multiple first mounting slots 211. The number of heat dissipation pipes 11 can correspond one-to-one with the number of first mounting slots 211, or it can be less than the number of first mounting slots 211. The heat dissipation pipe 11 passes through the corresponding first mounting slot 211, and the outer contour of the cross-section of the heat dissipation pipe 11 in the extending direction (axial direction of the stator 2) is a first rectangle, the first rectangle including two first sides 111. The two first sides 111 of each first rectangle are parallel and extend radially along the rotor 3, and the multiple segments 241 of each segment group 242 are stacked along the extending direction of the first sides 111.

[0068] Optionally, the first rectangle can be a square or a rectangle, and the top corners of the first rectangle can be rounded to facilitate the fit between the heat sink 11 and the inner wall of the first mounting groove 211. A heat dissipation fluid can be placed inside the heat sink 11. This heat dissipation fluid can be a coolant or water to dissipate heat from the stator 2. The cross-section of the heat sink 11 in its extending direction is a U-shaped structure, meaning the cross-section of the inner wall of the heat sink 11 is also rectangular, thereby increasing the flow area.

[0069] Optionally, the magnetic housing 21 and rotor 3 can be made of soft magnetic materials. For example, the magnetic housing 21 and rotor 3 can be made of ferrite or silicon steel, meaning that no permanent magnets are placed on the magnetic housing 21 and rotor 3. Thus, the brushless motor is configured as a reluctance motor. This brushless motor can be applied to new energy vehicles.

[0070] In summary, the brushless motor in this embodiment has a first mounting slot 211 and a second mounting slot 212 spaced apart on the magnetic housing 21. The excitation winding 23 is placed in the second mounting slot 212, and the segments 241 are stacked in the first mounting slot 211. Therefore, the heat dissipation pipe 11 can dissipate heat from the segments 242 located in the same first mounting slot 211, effectively improving the cooling efficiency of the armature winding 22. Furthermore, configuring the cross-section of the heat dissipation pipe 11 as a rectangular structure increases the heat dissipation area between the heat dissipation unit 1 and the stator 2, and also increases the flow rate of the coolant. Simultaneously, the first side 111 is arranged radially along the rotor 3, so that multiple heat dissipation pipes 11 are arranged around the rotor 3. This improves the consistency of heat dissipation efficiency of the heat dissipation unit 1 for various areas of the stator 2.

[0071] In some implementations, such as Figures 4-5As shown, the outer contour of the cross-section in the extension direction (axial direction of stator 2) of segment 241 is a second rectangle, and the adjacent sides of the first rectangle and the adjacent sides of the second rectangle are of unequal length. The long side of the first rectangle and the short side of the second rectangle extend radially along the rotor 3. In this embodiment, the arrangement of segment group 242 and heat dissipation pipe 11 ensures that the pole teeth 214 located between the two first mounting slots 211 have sufficient thickness, so that the width of the pole teeth 214 can be adapted to the convex teeth 31 of the rotor 3.

[0072] Furthermore, the first side 111 is the long side, and the second side 112 is perpendicular to the first side 111 and is the short side. The first side 111 on one side of the heat sink 11 abuts against the inner wall of the first mounting groove 211, and the first side 111 on the other side abuts against the short sides of a plurality of second rectangles. This makes the segment group 242 and the heat sink 11 in the first mounting groove 211 more compact, and the heat sink 11 conducts heat with the segment group 242 and the magnetic shell 21 through the two side walls.

[0073] In some implementations, such as Figures 1-3 As shown, the brushless motor has three or six phases. The number of multiple first mounting slots 211 is M, and the rotor 3 includes N protruding teeth 31, where M / N = 1.5, and both M and N are positive integers.

[0074] Optionally, the brushless motor has six phases. The magnetic housing 21 has 18 first mounting slots 211 and 12 second mounting slots 212. The heat dissipation pipes 11 correspond one-to-one with the first mounting slots 211. Therefore, the brushless motor can operate stably while ensuring that the pole teeth 214 have sufficient thickness.

[0075] In some implementations, such as Figures 4-5 As shown, the excitation winding 23 is wound around two second mounting slots 212. Further referencing... Figures 2-3 As shown, the segment group 242 and the heat dissipation pipe 11 located in the same first mounting slot 211 form an armature unit 4. Multiple armature units 4 form multiple first armature units 81, multiple second armature units 82, and multiple third armature units 83. The second armature unit 82 is located between the first armature unit 81 and the third armature unit 83. The second armature unit 82, together with the adjacent first armature unit 81, third armature unit 83, and excitation winding 23, form a stator phase 5. The first armature unit 81, second armature unit 82, and third armature unit 83 of each stator phase 5 are arranged sequentially in the same direction. At the same time, in the same stator phase 5, two second mounting slots 212 corresponding to the same excitation winding 23 are located on both sides of the first armature unit 81 and the third armature unit 83, respectively.

[0076] Specifically, in this embodiment, the excitation winding 23 corresponds to three armature units 4, with each armature winding 22 wound around a pole tooth 214. DC power is used to supply power to the excitation winding 23, enabling it to provide a stable magnetic field for the brushless motor, replacing permanent magnets. Three-phase AC power is used to supply power to the armature winding 22 to generate an alternating magnetic field. This alternating magnetic field couples with the magnetic field of the excitation winding 23, thereby forming an electromagnetic torque acting on the rotor 3.

[0077] In some implementations, such as Figure 1 and Figure 3 As shown, the magnetic housing 21 has a receiving hole 213 for accommodating the rotor 3. The first mounting groove 211 includes a first receiving chamber 2111 and a second receiving chamber 2112 connected to each other. One side of the first receiving chamber 2111 communicates with the receiving hole 213, and pole teeth 214 are formed between two adjacent first receiving chambers 2111. At least a portion of the segment group 242 is disposed in the first receiving chamber 2111, and the heat dissipation pipe 11 is disposed in either the first receiving chamber 2111 or the second receiving chamber 2112. The second mounting groove 212 is disposed on the pole teeth 214. In the radial direction of the rotor 3, the second mounting groove 212 is located between the receiving hole 213 and the second receiving chamber 2112.

[0078] Specifically, the first mounting slot 211 has a first opening facing the rotor 3, and the inner wall of the receiving hole 213 is divided into 18 pole teeth 214 by 18 first openings. Twelve second mounting slots 212 are arranged in pairs. Each pair of second mounting slots 212 is disposed on one pole tooth 214, and the current direction of the cable in each pair of second mounting slots 212 is consistent. The second mounting slot 212 has a second opening facing the rotor 3. The excitation winding 23 can be a cable, and the cross-section of the cable can be circular. The cable located in the second mounting slot 212 can be wound with a single turn or multiple turns. The excitation winding 23 enters the second mounting slot 212 through the second opening. This makes the first mounting slot 211 and the second mounting slot 212 more compact, facilitating the cooling pipe 11 to cool the armature winding 22 and the excitation winding 23.

[0079] Furthermore, the cross-sections of the first accommodating chamber 2111 and the second accommodating chamber 2112 extending in the axial direction (of the stator 2) form rectangular cavities, and the segment group 242 and the heat dissipation pipe 11 are fitted against the inner wall of the rectangular cavity. Thus, the armature unit 4 is fixed to the first accommodating chamber 2111 and the second accommodating chamber 2112, avoiding gaps between the segment group 242 and the heat dissipation pipe 11, and ensuring that the heat dissipation pipe 11 has sufficient heat dissipation area.

[0080] In some implementations, such as Figures 1-2As shown, the segment group 242 of the first mounting slot 211 is disposed in the first receiving chamber 2111, and the heat dissipation pipe 11 is disposed in the second receiving chamber 2112. In the circumferential direction of the rotor 3, the two heat dissipation pipes 11 and the two second mounting slots 212 are located on opposite sides of two adjacent stator phases 5. Therefore, by utilizing the two oppositely arranged heat dissipation pipes 11, heat can be dissipated from the paired second mounting slots 212, thereby improving heat dissipation efficiency.

[0081] Specifically, such as Figures 1-2 As shown, in this embodiment, the segments 242 of two adjacent first accommodating chambers 2111 are located in the same armature winding 22. A stator phase 5 includes one excitation winding 23 and one armature winding 22. Simultaneously, six armature windings 22 are arranged spanning two adjacent stator phases 5.

[0082] In some implementations, such as Figure 3 and Figure 5 As shown, the multiple stator phases 5 include multiple first stator phases 51 and multiple second stator phases 52. In the circumferential direction of the rotor 3, the first stator phases 51 and second stator phases 52 are alternately arranged, and the two heat dissipation pipes 11 are located on opposite sides of two adjacent stator phases 5. Meanwhile, in this embodiment, each segment group 242 of the armature unit 4 includes a first portion 61 and a second portion 62, with the first portion 61 being farther away from the rotor 3 relative to the second portion 62.

[0083] Further reference Figure 3 As shown, in the first stator phase 51, the segment groups 242 of the first armature unit 81 and the second armature unit 82 are both disposed in the first receiving chamber 2111, and the heat dissipation pipe 11 is disposed in the second receiving chamber 2112. The second part 62 and the heat dissipation pipe 11 of the third armature unit 83 are disposed in the first receiving chamber 2111, and the first part 61 is disposed in the second receiving chamber 2112. That is, the first part 61 and the second part 62 are staggered.

[0084] Further reference Figure 3 As shown, in the second stator phase 52, the second portion 62 of the first armature unit 81 and the second armature unit 82, and the heat dissipation pipe 11 are disposed in the first receiving chamber 2111, and the first portion 61 is disposed in the second receiving chamber 2112. That is, the first portion 61 and the second portion 62 are staggered. The segment group 242 of the third armature unit 83 is disposed in the first receiving chamber 2111, and the heat dissipation pipe 11 is disposed in the second receiving chamber 2112. In other words, the configuration of the first armature unit 81 and the second armature unit 82 in the first stator phase 51, and the third armature unit 83 in the second stator phase 52 in this embodiment is similar to... Figure 2 The method is similar. Thus, in the upward direction of the second circumference of the stator, the adjacent first part 61 and the adjacent second part 62 respectively form armature windings 22.

[0085] In some implementations, such as Figure 3 and Figure 5 As shown, in the same stator phase 5, the two second receiving chambers 2112 of the first armature unit 81 and the third armature unit 83 are located far apart from each other, and the second receiving chamber 2112 of the second armature unit 82 is close to the third armature unit 83. In the circumferential direction of the rotor 3, two second mounting slots 212 are located on opposite sides of two adjacent stator phases 5. The heat dissipation pipe 11, which is located in the same first receiving chamber 2111 as the first part 61, is located away from the rotor 3. In the first stator phase 51, the first part 61 of the second armature unit 82 and the first part 61 of the first armature unit 81 are in the same armature winding 22, and the second part 62 of the second armature unit 82 and the second part 62 of the third armature unit 83 are in the same armature winding 22. Simultaneously, the second portion 62 of the first armature unit 81 and the second portion 62 of the adjacent third armature unit 83 are in the same armature winding 22, and the first portion 61 of the third armature unit 83 and the first portion 61 of the adjacent first armature unit 81 are in the same armature winding 22. In the second stator phase 52, the second portion 62 of the second armature unit 82 and the second portion 62 of the first armature unit 81 are in the same armature winding 22, and the first portion 61 of the second armature unit 82 and the first portion 61 of the third armature unit 83 are in the same armature winding 22. The second portions 62 of adjacent first armature units 81 and third armature units 83 are in the same armature winding 22, or the first portions 61 of adjacent first armature units 81 and third armature units 83 are in the same armature winding 22.

[0086] Therefore, in the axial cross-sectional direction of the rotor 3, the armature winding 22 can be staggered from the heat sink 11 to avoid interference between the heat sink 11 and the armature winding 22. For example, the heat sink 11 can extend from the magnetic shell 21 in a straight line (e.g., Figure 6 (As shown by the dotted line in the diagram), and then they converge, so that the heat dissipation pipe 11 crosses the transition section 71 before bending. This simplifies the piping structure of the heat dissipation section 1.

[0087] In some implementations, such as Figure 5 As shown, the first part 61 has multiple segments 241, which are the same number as the second part 62. In this embodiment, the first part 61 and the second part 62 are alternately distributed in the circumferential direction of the rotor 3. For this purpose, the number of turns of the first part 61 and the second part 62 are configured to be the same (for example, both are distributed in three layers) so that the magnetic field strength of the first part 61 and the second part 62 is consistent.

[0088] In some implementations, such as Figures 4-5As shown, in the radial direction of the rotor 3, multiple connectors 7 of each armature winding 22 are stacked sequentially. That is, multiple connectors 7 of each armature winding 22 are in their respective layers to simplify the assembly process of the brushless motor.

[0089] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principle of this utility model should be included within the protection scope of this utility model.

Claims

1. A brushless motor, characterized in that, The brushless motor includes: Rotor (3); The stator (2) includes a magnetic housing (21), a plurality of armature windings (22), and a plurality of excitation windings (23). The magnetic housing (21) has a plurality of first mounting slots (211) and a plurality of second mounting slots (212) arranged around the rotor (3). The first mounting slots (211) and the second mounting slots (212) are separated in the circumferential direction of the rotor (3). The excitation windings (23) are disposed in the second mounting slots (212). The armature windings (22) include windings. The windings include a plurality of spaced segments (241) in the extending direction. The plurality of segments (241) form a plurality of segment groups (242). The plurality of segment groups (242) are respectively disposed in the plurality of first mounting slots (211). The heat dissipation section (1) includes a plurality of heat dissipation pipes (11) corresponding to at least a portion of a plurality of first mounting slots (211), the heat dissipation pipes (11) passing through the corresponding first mounting slots (211), and in the cross-sectional direction of the stator (2) axial direction, the outer contour of the heat dissipation pipes (11) is a first rectangle with adjacent sides of unequal length, the first rectangle includes two first sides (111), the first sides (111) being the long sides, the two first sides (111) of each first rectangle are parallel and extend radially along the rotor (3), and the plurality of segments (241) of each segment group (242) are stacked along the extension direction of the first side (111).

2. The brushless motor according to claim 1, characterized in that, In the axial cross-sectional direction of the stator (2), the outer contour of the segment (241) is a second rectangle, and the adjacent sides of the second rectangle are of unequal length; The long side of the first rectangle and the short side of the second rectangle extend radially along the rotor (3).

3. The brushless motor according to claim 2, characterized in that, The first side (111) is the long side, and one of the first sides (111) of the heat dissipation pipe (11) abuts against the inner wall of the first mounting groove (211), and the other first side (111) abuts against the short side of the plurality of second rectangles.

4. The brushless motor according to claim 1, characterized in that, The brushless motor has three or six phases; The number of the plurality of first mounting slots (211) is M, and the rotor (3) includes N protruding teeth (31), wherein M / N = 1.5, and M and N are both positive integers.

5. The brushless motor according to claim 4, characterized in that, The excitation winding (23) is wound around the two second mounting slots (212); The segment group (242) and the heat dissipation pipe (11) located in the same first mounting slot (211) form an armature unit (4). Multiple armature units (4) form multiple first armature units (81), multiple second armature units (82) and multiple third armature units (83). The second armature unit (82) is located between the first armature unit (81) and the third armature unit (83). The second armature unit (82) forms a stator phase (5) with the adjacent first armature unit (81), the third armature unit (83) and a field winding (23). The first armature unit (81), the second armature unit (82) and the third armature unit (83) of each stator phase (5) are arranged sequentially in the same direction. In the same stator phase (5), two second mounting slots (212) corresponding to the same excitation winding (23) are located on both sides of the first armature unit (81) and the third armature unit (83), respectively.

6. The brushless motor according to claim 5, characterized in that, The magnetic housing (21) has a receiving hole (213) for accommodating the rotor (3); The first mounting slot (211) includes a first accommodating chamber (2111) and a second accommodating chamber (2112) connected to each other. One side of the first accommodating chamber (2111) is connected to the accommodating hole (213). A pole tooth (214) is formed between two adjacent first accommodating chambers (2111). At least a portion of the segment group (242) is disposed in the first accommodating chamber (2111). The heat dissipation pipe (11) is disposed in the first accommodating chamber (2111) or the second accommodating chamber (2112). The second mounting groove (212) is disposed on the pole tooth (214) and is located in the radial direction of the rotor (3) between the receiving hole (213) and the second receiving chamber (2112).

7. The brushless motor according to claim 6, characterized in that, In the axial cross-sectional direction of the stator (2), the cross-sections of the first accommodating chamber (2111) and the second accommodating chamber (2112) form a rectangular cavity, and the segment group (242) and the heat dissipation pipe (11) abut against the inner wall of the rectangular cavity.

8. The brushless motor according to claim 6, characterized in that, The segment group (242) of the first mounting slot (211) is disposed in the first accommodating chamber (2111), and the heat dissipation pipe (11) is disposed in the second accommodating chamber (2112); In the circumferential direction of the rotor (3), the two heat dissipation pipes (11) and the two second mounting slots (212) are located on opposite sides of two adjacent stator phases (5).

9. The brushless motor according to claim 6, characterized in that, The plurality of stator phases (5) include a plurality of first stator phases (51) and a plurality of second stator phases (52); Each of the segment groups (242) of the armature unit (4) includes a first part (61) and a second part (62), wherein the first part (61) is farther away from the rotor (3) relative to the second part (62); In the first stator phase (51), the segment group (242) of the first armature unit (81) and the second armature unit (82) are both disposed in the first accommodating chamber (2111), and the heat dissipation pipe (11) is disposed in the second accommodating chamber (2112). The second part (62) of the third armature unit (83) and the heat dissipation pipe (11) are disposed in the first accommodating chamber (2111), and the first part (61) is disposed in the second accommodating chamber (2112). In the second stator phase (52), the second part (62) of the first armature unit (81) and the second armature unit (82) and the heat dissipation pipe (11) are disposed in the first accommodating chamber (2111), the first part (61) is disposed in the second accommodating chamber (2112), the segment group (242) of the third armature unit (83) is disposed in the first accommodating chamber (2111), and the heat dissipation pipe (11) is disposed in the second accommodating chamber (2112); In the circumferential direction of the rotor (3), the first stator phase (51) and the second stator phase (52) are alternately arranged.

10. The brushless motor according to claim 9, characterized in that, In the same stator phase (5), the two second accommodating chambers (2112) of the first armature unit (81) and the third armature unit (83) are located far apart from each other, and the second accommodating chamber (2112) of the second armature unit (82) is close to the third armature unit (83); In the circumferential direction of the rotor (3), the two second mounting slots (212) are located on opposite sides of two adjacent stator phases (5), and the heat dissipation pipe (11) located in the same first accommodating chamber (2111) as the first part (61) is disposed away from the rotor (3); In the first stator phase (51), the first part (61) of the second armature unit (82) and the first part (61) of the first armature unit (81) are in the same armature winding (22), and the second part (62) of the second armature unit (82) and the second part (62) of the third armature unit (83) are in the same armature winding (22). At the same time, the second part (62) of the first armature unit (81) and the second part (62) of the third armature unit (83) of the adjacent second stator phase (52) are in the same armature winding (22), and the first part (61) of the third armature unit (83) and the first part (61) of the first armature unit (81) of the adjacent second stator phase (52) are in the same armature winding (22). In the second stator phase (52), the second part (62) of the second armature unit (82) and the second part (62) of the first armature unit (81) are in the same armature winding (22), and the first part (61) of the second armature unit (82) and the first part (61) of the third armature unit (83) are in the same armature winding (22).

11. The brushless motor according to claim 10, characterized in that, The first part (61) has a plurality of segments (241) and the same number of segments (241) as the second part (62).

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