Stator and rotor assembly and permanent magnet brushless motor

Abstract

The invention discloses a stator and rotor assembly and a permanent magnet brushless motor, and the stator and rotor assembly comprises a rotor body, magnetic steel, an insulating pre-tightening part, and an injection molding part. The rotor body is provided with magnetic steel grooves. The magnetic steel is arranged in the magnetic steel groove; the insulation pre-tightening piece and the rotor body are arranged in a split mode, the insulation pre-tightening piece is connected with the rotor body, the insulation pre-tightening piece comprises a pre-tightening part, and the pre-tightening part is compressed by the magnetic steel in the radial direction so as to compress and fix the magnetic steel and compensate the deviation of the magnetic steel in the radial direction. One end, facing the inner side of the rotor body, of the magnetic steel is insulated and separated from the rotor body; the injection molding part wraps the insulation pre-tightening part and the magnetic steel so as to ensure that the relative positions of the insulation pre-tightening part, the magnetic steel and the rotor body are stable. According to the stator and rotor assembly and the permanent magnet brushless motor, one end, facing the inner side of the rotor body, of the magnetic steel is separated from the rotor body, and the end, facing the inner side of the rotor body, of the magnetic steel is prevented from making contact with the rotor body to generate magnetic leakage.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a stator-rotor assembly and a permanent magnet brushless motor. Background Technology

[0002] Permanent magnet brushless motors are widely used in home appliances due to their high efficiency and low vibration and noise, such as air conditioners and refrigerators, which operate continuously. However, rotor magnetic leakage is one of the main factors affecting the power output of permanent magnet brushless motors.

[0003] Existing permanent magnet brushless motors consist of a rotor body and magnets. The magnets are installed in magnet slots cut into the rotor body and are then glued to the rotor body or fixed in the magnet slots using an interference fit. This fixing method causes the inner end of the magnet to contact the rotor body, resulting in severe magnetic leakage in the motor rotor. This is especially problematic during long-term operation, significantly impacting the power of the permanent magnet brushless motor. Currently, injection molding is also used to fix the magnets, but this process requires precise positioning of the magnets relative to the magnet slots, making it technically challenging. Therefore, there is an urgent need to design a permanent magnet brushless motor with low magnetic leakage, high power and efficiency, and high precision in the relative positioning of the magnets. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a stator-rotor assembly and a permanent magnet brushless motor, which separates the end of the magnet facing the inner side of the rotor body from the rotor body to prevent the end of the magnet facing the inner side of the rotor body from contacting the rotor body and generating magnetic leakage.

[0005] This invention is achieved through the following technical solution:

[0006] A stator-rotor assembly, comprising:

[0007] The rotor body has magnetic slots.

[0008] A magnet is installed inside the magnet groove;

[0009] An insulating pre-tightening member is separately disposed from the rotor body and connected to the rotor body. The insulating pre-tightening member includes a pre-tightening part, which is compressed radially by the magnet to press and fix the magnet and compensate for the radial offset of the magnet. One end of the magnet facing the inner side of the rotor body is insulated and separated from the rotor body.

[0010] The injection molded part covers the insulating preload and the magnet to ensure the relative positional stability of the insulating preload, the magnet and the rotor body.

[0011] Furthermore, the rotor body is provided with a magnetic isolation bridge, which is located at one end of the magnet slot facing radially outward from the rotor body; the preload portion drives the magnet to press against the magnetic isolation bridge radially, so as to radially press the magnet into the magnet slot.

[0012] Furthermore, at least one pair of magnetic isolation bridges are provided, and the pair of magnetic isolation bridges are symmetrically arranged circumferentially with respect to the diameter of the rotor body. A first notch communicating with the magnet slot is formed between the pair of magnetic isolation bridges. The magnet slot includes a main body cavity for accommodating the magnet and a connecting cavity for accommodating the preload portion. The first width of the first notch is 0.53 to 0.55 times the second width of the main body cavity. The first thickness of the first notch in the radial direction is 0.04 to 0.06 times the first length of the main body cavity.

[0013] Furthermore, the second length of the connecting cavity is 0.52 to 0.55 times the third width of the connecting cavity at the end opposite to the main cavity.

[0014] Furthermore, the pre-tightening part includes an abutting part and a guiding part arranged sequentially along the installation direction of the magnet; the radial distance between the guiding part and the magnetic isolation bridge is greater than the length direction of the magnet; the radial distance between the abutting part and the magnetic isolation bridge is less than the length direction of the magnet, so that the abutting part abuts against the magnet during the installation of the magnet in the magnet groove.

[0015] Furthermore, one end of the guide portion connected to the abutment portion is formed by a guide slope, which is used to guide the connection between the magnet and the abutment portion.

[0016] Furthermore, the insulating pretensioner includes a base portion, one end of which is connected to the base portion, and the base portion abuts against the rotor body along the axial direction of the rotor body to limit the insulating pretensioner.

[0017] And / or, the pre-tightening part is made of a material with plastic deformation capability.

[0018] Furthermore, the insulating pre-tightening member also includes a contouring part, and the rotor body is provided with an embedding groove that communicates with the magnet slot and is located on the inside of the rotor body facing the magnet slot. At least a portion of the contouring part is similar to the outline of the embedding groove and is interference-fitted with the embedding groove.

[0019] Furthermore, it also includes a stator body, which has stator slots, and the ratio of the number of stator slots to the number of magnet slots is 6:5.

[0020] Furthermore, the fourth width of the stator slot at one end radially toward the inner side of the stator body is 0.6 to 0.7 times the fifth width of the stator slot at one end radially toward the outer side of the stator body.

[0021] Furthermore, the stator body is also provided with a second notch that communicates with the stator slot and is located on the side of the stator slot facing inward in a radial direction; the second thickness of the second notch is 0.15 to 0.17 times the third length of the stator slot; the sixth width of the second notch is 0.17 to 0.19 times the fourth width of the stator slot facing inward in a radial direction at one end of the stator body.

[0022] Furthermore, the rotor body is provided with a plurality of rotor teeth, and the magnetic groove is formed between the inner walls of adjacent rotor teeth; the outer ends of the rotor teeth form arc contours, and the centers of the arc contours formed by the plurality of rotor teeth are connected in sequence to form a ring, and the ring is concentrically arranged with the rotor body.

[0023] Furthermore, the diameter of the arc profile formed by the rotor teeth is 0.70 to 0.75 times the diameter of the rotor body.

[0024] A permanent magnet brushless motor, comprising:

[0025] Any of the above stator and rotor assemblies;

[0026] The housing has a heat dissipation protrusion extending from the inner wall of the housing toward the interior of the housing. The heat dissipation protrusion includes at least one heat dissipation plane, which is disposed on the side facing the axis of the motor and extends downward along the inner wall of the housing.

[0027] Multiple electronic components, at least one of which is in thermal contact with the heat dissipation plane to transfer heat with the heat dissipation protrusion;

[0028] A clamping member is disposed on the side of the electronic component away from the heat dissipation protrusion and clamps the electronic component to the heat dissipation protrusion.

[0029] Furthermore, multiple electronic components are disposed on the edge of the circuit board of the motor and are evenly distributed along the first direction and respectively in thermal contact with the heat dissipation plane. The clamping member extends along the arrangement direction of the electronic components, and one of the clamping members presses at least one electronic component against the heat dissipation protrusion.

[0030] Furthermore, multiple electronic components are disposed on the edge of the control circuit board of the motor and are evenly distributed along the first direction and respectively in thermal contact with the heat dissipation plane. The clamping members extend along the arrangement direction of the electronic components, and the multiple clamping members press at least one electronic component against the heat dissipation protrusion. The multiple clamping members are spaced downward along the inner wall of the housing.

[0031] Furthermore, the plane containing the heat dissipation surface is arranged parallel to the axis of the permanent magnet brushless motor.

[0032] Furthermore, locking holes are provided at opposite ends of the clamping member, and the clamping member is fixedly connected to the heat dissipation protrusion by locking members passing through the locking holes.

[0033] Furthermore, the clamping member is provided with an insulating sleeve to ensure that the clamping member is insulated from the electronic component.

[0034] Furthermore, the insulating sleeve is a heat-shrinkable sleeve made of PVC, and the clamping component is made of galvanized steel plate.

[0035] Furthermore, the sum of the projected areas of all the electronic components on the heat dissipation plane along the direction perpendicular to the center line of the housing is in a ratio of 1:1, and the projections of all the electronic components fall on the heat dissipation plane.

[0036] Furthermore, at least one of the electronic components is in direct contact with the heat dissipation plane to achieve thermal contact;

[0037] Alternatively, the motor may further include a heat sink disposed between the electronic component and the heat dissipation plane, and at least one of the electronic components indirectly contacts the heat dissipation plane through the heat sink to achieve thermal contact.

[0038] Furthermore, the ratio of the sum of the projected areas of all the electronic components on the heat sink along the direction perpendicular to the center line of the housing to the area of ​​the surface of the heat sink facing the electronic components is 1:, and the projections of all the electronic components fall entirely on the heat sink.

[0039] Furthermore, the outer wall of the outer casing is formed with heat dissipation ribs to increase the heat dissipation area of ​​the outer casing.

[0040] Furthermore, it also includes a control circuit board, the electronic components are electrically connected to the control circuit board, and the main body of the electronic components is disposed on the side of the control circuit board facing the stator and rotor of the motor.

[0041] Furthermore, a receiving cavity is formed inside the housing, and the motor also includes a sealing plate. The sealing plate is disposed inside the housing and divides the receiving cavity axially into a first chamber and a second chamber. The control circuit board is disposed in the first chamber, and the second chamber is used to accommodate the stator and rotor.

[0042] Furthermore, a sealing element is provided between the sealing plate and the outer shell, the sealing element being used to seal the connection between the sealing plate and the outer shell, thereby sealing and separating the first chamber and the second chamber.

[0043] Furthermore, the outer casing is also provided with a through hole that penetrates the outer casing, the through hole communicating with the first chamber, and the through hole being located on the side of the first chamber adjacent to the sealing plate.

[0044] Furthermore, the outer casing is also provided with heat dissipation holes that penetrate the outer casing. The heat dissipation holes communicate with the second chamber and are located on the side of the second chamber near the sealing plate, so as to be axially offset from the stator and rotor.

[0045] Furthermore, the outer casing includes a body portion and a positioning portion, the positioning portion protruding towards the second cavity, and a portion of the positioning portion is hollowed out from the body portion to form the heat dissipation hole between the positioning portion and the body portion.

[0046] Furthermore, it also includes a bearing bracket, which abuts against the end face of the positioning part in the axial direction; the bearing bracket is provided with a hollow part.

[0047] Furthermore, the sealing plate and the bearing bracket are stacked along the axial direction of the motor, and the sealing plate and the bearing bracket are locked and fixed by fasteners.

[0048] Compared with the prior art, the advantages of this invention are:

[0049] By setting an insulating preload component that abuts against the side of the magnet facing inwards from the rotor body, insulation separation is achieved between the end of the magnet facing inwards from the rotor body and the insulating component. This prevents the end of the magnet facing inwards from contacting the rotor body and causing magnetic leakage, thereby improving the power and efficiency of the motor using this stator-rotor assembly. Furthermore, abutting the insulating preload component against the magnet also preloads the position of the magnet, preventing movement of the magnet during injection molding and ensuring the symmetry of the magnetic circuit. In addition, the insulating preload component can also compensate for radial offset of the magnet, thereby adjusting the position of the magnet. By setting the injection molded part, the relative positions between the magnet, the insulating preload component, and the rotor body can be kept fixed during motor operation, and the overall strength of the stator-rotor assembly can be improved. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the stator and rotor assembly according to an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the stator and rotor assembly after the injection-molded parts have been removed according to an embodiment of the present invention.

[0052] Figure 3 This is a cross-sectional view of a stator and rotor assembly according to an embodiment of the present invention;

[0053] Figure 4 This is a partial structural schematic diagram of a stator and rotor assembly according to an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of the rotor body of a stator-rotor assembly according to an embodiment of the present invention;

[0055] Figure 6 for Figure 5 Enlarged view of section A;

[0056] Figure 7 This is a schematic diagram of the structure of the insulating preload of the stator and rotor assembly according to an embodiment of the present invention;

[0057] Figure 8 This is a schematic diagram of the structure of an insulating pretensioner according to another embodiment of the present invention;

[0058] Figure 9 This is a schematic diagram of the stator body of a stator-rotor assembly according to an embodiment of the present invention;

[0059] Figure 10 for Figure 9 Enlarged view of section B;

[0060] Figure 11 This is a schematic diagram of another part of the stator and rotor assembly according to an embodiment of the present invention;

[0061] Figure 12 This is a schematic diagram of the structure of a permanent magnet brushless motor according to an embodiment of the present invention;

[0062] Figure 13 This is a planar sectional view of a permanent magnet brushless motor according to an embodiment of the present invention;

[0063] Figure 14 for Figure 13 Enlarged view of section A;

[0064] Figure 15 This is a partial structural schematic diagram of a permanent magnet brushless motor according to an embodiment of the present invention;

[0065] Figure 16 This is an exploded view of a portion of the structure of a permanent magnet brushless motor according to an embodiment of the present invention.

[0066] Figure 17 This is another partial structural schematic diagram of a permanent magnet brushless motor according to an embodiment of the present invention.

[0067] In the diagram: 1. Stator and rotor assembly; 11. Rotor body; 111. Magnet slot; 1111. Main cavity; D2. Second width; H1. First length; 1112. Connecting cavity; H2. Second length; D3. Third width; 112. Magnetic isolation bridge; 1121. First notch; D1. First width; T1. First thickness; 113. Embedding slot; 114. Rotor tooth; 12. Magnet; 13. Insulating pre-tightening component; 131. Pre-tightening part; 1311. Abutting part; 1312. Guide part; 1313. Guide slope; 132. Base part; 133. Contouring part; 14. Stator body; 141. Stator slot; D4. Fourth width; D5. Fifth width; H3. Third length; 14 2. Second notch; T2. Second thickness; D6. Sixth width; 143. Stator tooth; 15. Injection molded part; 2. Outer shell; 21. Heat dissipation protrusion; 211. Heat dissipation plane; 22. Heat dissipation rib; 23. First chamber; 24. Second chamber; 25. Through hole; 26. Body part; 27. Positioning part; 271. Heat dissipation hole; 28. First housing; 29. ​​Second housing; 3. Electronic component; 31. Main body part; 32. Pin; 5. Heat sink; 6. Control circuit board; 7. Sealing plate; 71. Sealing element; 4. Clamping element; 41. Locking hole; 42. Insulating sleeve; 43. Locking element; 17. Rotating shaft; 16. Bearing; 8. Bearing bracket; 81. Hollowed-out part; 82. Fixing element. Detailed Implementation

[0068] The following detailed, non-limiting description of the invention's technical solutions, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0069] like Figures 1 to 3 As shown, a stator-rotor assembly 1 corresponding to a preferred embodiment of the present invention includes a rotor body 11, a magnet 12, an insulating preload 13, an injection molded part 15, and a stator body 14.

[0070] Further reference Figure 4 and Figure 5 The rotor body 11 includes multiple rotor teeth 114, and the rotor body 11 has magnetic slots 111 for accommodating magnets 12. Multiple magnetic slots 111 can be provided, and the extending direction of the magnetic slots 111 can be parallel to the axial direction of the rotor body 11, allowing the magnets 12 to be inserted into the magnetic slots 111 from the end of the rotor body 11. The magnetic slots 111 can be located between adjacent rotor teeth 114, forming magnetic slots 111 between the inner walls of adjacent rotor teeth 114, and the multiple rotor teeth 114 can be arranged in a ring array. The rotor teeth 114 can be parallel teeth, meaning the width of the tooth portion relative to the two side walls is equal in the radial direction everywhere. The outer ends of the rotor teeth 114 can form arc contours, meaning the end contour of the rotor teeth 114 away from the interior of the rotor body 11 is arc-shaped. The centers of the arc contours formed by multiple rotor teeth 114 are sequentially connected to form a ring, and this ring is concentrically arranged with the rotor body 11.

[0071] In some existing stator-rotor assemblies, the magnets and magnet slots are fitted with an interference fit to achieve magnet installation. However, magnets have strong adsorption forces and easily attract ferromagnetic materials such as the rotor. Because of the interference fit, it is necessary to ensure the magnet is directly opposite the slot and that an interference force is applied to the center of the magnet's end face. If the magnet is misaligned with the slot, it will cause hard contact between the magnet and the slot, resulting in damage to the magnetic field and / or the rotor body 11 forming the slot under the interference force. Furthermore, in existing stator-rotor assemblies, the attraction between the magnet and ferromagnetic materials makes it easy for the magnet to misalign with the slot, making magnet installation in the slot quite difficult.

[0072] Further reference Figure 5 In this application, to facilitate the installation of the magnet 12 within the main body cavity 1111, the magnet slot 111 may include the main body cavity 1111 and the connecting cavity 1112. The main body cavity 1111 is used to accommodate the magnet 12. The main body cavity 1111 can be clearance-fitted with the magnet 12, allowing the magnet 12 to be conveniently inserted axially into the main body cavity 1111 from one end of the rotor body 11. The connecting cavity 1112 is used to accommodate a portion of the insulating pre-tightening member 13, so that the insulating pre-tightening member 13 can be connected to the magnet 12 and apply a clamping force to the magnet 12, thereby fixing the magnet 12.

[0073] In addition, the rotor body 11 may also be provided with magnetic isolation bridges 112 and embedding slots 113. The magnetic isolation bridges 112 are disposed at one end of the magnet slot 111 radially away from the inner side of the rotor body 11, and the inner wall of the magnetic isolation bridges 112 can be used to form a partial outline of the magnet slot 111. Preferably, each magnet slot 111 has a pair of magnetic isolation bridges 112 at one end away from the inner side of the rotor body 11, and the pair of magnetic isolation bridges 112 are spaced apart, so that a first gap 1121 communicating with the magnet slot 111 is formed between the pair of magnetic isolation bridges 112. The pair of magnetic isolation bridges 112 are symmetrically arranged circumferentially about the diameter of the rotor body, so that the first gap 1121 can be centrally aligned with the magnet slot 111. The magnetic isolation bridges 112 can limit magnetic leakage by achieving magnetic flux saturation at the bridge portion, and the magnetic isolation bridges 112 can also be used to support the magnet 12. The embedding slots 113 are used to accommodate a portion of the insulating preload 13.

[0074] Further reference Figure 3 The insulating preload 13 is separately disposed from the rotor body 11 and connected to the rotor body. The insulating preload 13 is made of insulating material, specifically a material with plastic deformation capability, such as nylon PA66. After the insulating preload 13 is connected to the rotor body 11, at least a portion of the insulating preload 13 is located on the side of the magnet 12 facing the inside of the rotor body 11 and abuts against the magnet 12. This allows the side of the magnet 12 facing the inside of the rotor body 11 to be insulated from the rotor body 11 through the insulating preload 13, thereby preventing the side of the magnet 12 facing the inside of the rotor body 11 from contacting the rotor body 11 or other metal parts and generating leakage flux, thus improving the power of the motor using this stator-rotor assembly 1.

[0075] Further reference Figure 7 and Figure 8 The insulating pre-tightening member 13 may include a pre-tightening portion 131, a base portion 132, and a contouring portion 133, which may be an integral structure. The pre-tightening portion 131 may be installed in the connecting cavity 1112 of the magnet groove 111, and at least a portion of the pre-tightening portion 131 may extend into the magnet groove 111, specifically into the main cavity 1111 of the magnet groove 111. This allows the magnet 12 to be inserted into the main cavity 1111 and radially press the pre-tightening portion 131 within the main cavity 1111. The pre-tightening portion 131 will exert a radial force on the magnet 12, driving the magnet 12 away from the pre-tightening portion 131, i.e., driving the magnet 12 toward the magnetic isolation bridge 112, thereby radially pressing the magnet 12 against the magnetic isolation bridge 112. Therefore, when the pre-tightening part 131 is pressed against the magnet 12, the magnet 12 can be clamped and fixed by the magnetic isolation bridge 112 and the pre-tightening part 131 located on opposite sides of the magnet 12, thereby fixing the magnet 12 radially in the magnet groove 111.

[0076] To facilitate the installation of the magnet 12, the pre-tightening part 131 includes an abutment part 1311 and a guide part 1312 arranged sequentially along the installation direction of the magnet 12. The radial distance between the abutment part 1311 and the magnetic isolation bridge 112 is smaller than the length direction of the magnet 12, so that when the magnet 12 moves between the abutment part 1311 and the magnetic isolation bridge 112, the magnet 12 and the abutment part 1311 make interference contact, and the abutment part 1311 applies a radial clamping force to the magnet 12. The abutment part 1311 preferably has a certain plastic deformation capacity, so that when the magnet 12 moves between the abutment part 1311 and the magnetic isolation bridge 112, the magnet 12 will press against the abutment part 1311, causing the abutment part 1311 to be compressed and plastically deformed. The reaction force of the plastic deformation of the abutment part 1311 acts on the magnet 12, thereby applying a stable radial clamping force to the magnet 12. The length of the magnet 12 can be the length of the magnet 12 along the radial direction of the rotor body 11, and the distance between the abutment part 1311 and the magnetic isolation bridge 112 is the distance between the abutment part 1311 and the magnetic isolation bridge 112 along the length of the magnet 12.

[0077] It is also worth noting that the abutting end face of the abutting part 1311 is positioned directly opposite the magnet 12. Preferably, the abutting part 1311 is arranged symmetrically about the radial side. Before the pre-tightening part 131 is assembled, the magnet 12 is gapped in the magnet groove 111, which means that the relative position of the magnet 12 with respect to the magnet groove 111 cannot be guaranteed. Especially in structural designs with multiple magnets 12, the position of each magnet 12 cannot be guaranteed, which will inevitably cause the asymmetry of the magnetic circuit, primarily affecting the efficiency of the motor. However, through the above-mentioned arrangement, the abutting part 1311 first achieves pre-tightening of the magnet 12 radially, initially ensuring the position of the magnet 12 relative to the magnet groove 111. The rotor body 11 is formed by stamping and stacking. The structural precision of the magnet slots 1111 and the magnetic bridges 112 is guaranteed. During the contact process, the contact part 1311 undergoes plastic deformation under extrusion pressure. The reaction force of the plastic deformation is applied to the magnet 12, which pushes the side wall of the magnet 12 near the edge to contact the two magnetic bridges 112 respectively, making them approximately or completely fitted. Thus, based on the aforementioned radial pre-tightening of the magnet 12, it is also possible to achieve circumferential and even spatial micro-adjustment of the position, thereby compensating for the radial offset of the magnet 12 and making the relative position of the magnet 12 after pre-tightening and before injection molding approximately coincide with the theoretical relative position of the magnet slots 111. The approximate uniqueness of the relative positions of multiple magnets 12 effectively ensures the symmetry of the magnetic circuit, thereby ensuring the high efficiency and operational stability of the motor. The radial distance between the guide part 1312 and the magnetic bridges 112 is greater than the length direction of the magnet 12, so that there is a clearance fit between the magnet 12 and the guide part 1312. The end of the guide portion 1312 away from the abutment portion 1311 forms an insertion end. When the magnet 12 is inserted into the magnet slot 111 from the insertion end, the reserved space in the magnetic field slot 111 corresponding to the guide portion 1312 is at least larger in the radial dimension along the motor than the radial dimension of the magnet 12 along the motor, so that the magnet 12 will not be limited at the end face when it is inserted into the magnet slot 111. The installation accuracy requirement of the magnet 12 is low, which makes it easy to install the magnet 12 in the magnet slot 111.

[0078] One end of the guide portion 1312 connected to the abutment portion 1311 can form a guide ramp 1313. The guide ramp 1313 includes a first end facing the abutment portion 1311 and a second end facing away from the abutment portion 1311. The distance between the guide ramp 1313 and the magnetic bridge 112 gradually decreases from the first end to the second end until the guide ramp 1313 connects with the abutment portion 1311. When the magnet 12 moves to the guide ramp 1313 of the guide portion 1312, the magnet 12 is guided by a portion of the structure of the guide ramp 1313 to move to connect with the abutment portion 1311, so that the magnet 12 is facing the magnet groove 111 and the insulating preload 13. Specifically, the distance between the guide portion 1312 and the magnetic isolation bridge 112 is the distance between the guide portion 1312 and the magnetic isolation bridge 112 along the length direction of the magnet 12, and the distance between the guide inclined surface 1313 and the magnetic isolation bridge 112 is the distance between the guide inclined surface 1313 and the magnetic isolation bridge 112 along the length direction of the magnet 12. It is worth noting that the length direction of the magnet 12 can be defined as the radial direction of the rotor body 11.

[0079] The base portion 132 can abut against the rotor body 11 along the axial direction of the rotor body 11, and the base portion 132 can be connected to one end of the pre-tightening portion 131. When the insulating pre-tightening member 13 is installed on the rotor body 11 along the axial direction of the rotor body 11 and installed to the designated position, the base portion 132 can abut against the end of the rotor body 11 to limit further movement of the insulating pre-tightening member 13 and to position the axial insertion depth of the insulating pre-tightening member 13. The base portion 132 can be adapted to the end shape of the rotor body 11 so that the base portion 132 can form a larger effective contact area with the rotor body 11, improving the stability of the insulating pre-tightening member 13 after installation on the rotor body 11.

[0080] At least a portion of the contoured portion 133 resembles the outline of the recessed groove 113. For example, at least a portion of the contoured portion 133 has the same shape as the recessed groove 113, and the size of at least a portion of the contoured portion 133 is slightly larger than the size of the recessed groove 113, so that at least a portion of the contoured portion 133 can form an interference fit with the recessed groove 113, thereby allowing the contoured portion 133 to be fixedly installed in the recessed groove 113. When the motor is running, the rotor body 11 and the insulating preload 13 connected to the rotor body 11 will rotate with the rotor body 11 and will be affected by centrifugal force. By providing the contoured portion 133 that has an interference fit with the recessed groove 113, the insulating preload 13 can be limited by the rotor body 11 in the circumferential direction through the contoured portion 133, ensuring that the relative position between the insulating preload 13 and the rotor body 11 remains fixed when the motor is running.

[0081] To facilitate the installation of the contouring part 133 into the mounting groove 113, the contouring part 133 may include a third end and a fourth end opposite each other along the insertion direction of the contouring part 133, i.e., the axial direction of the rotor body 11. The third end of the contouring part 133 is clearance-fitted with the mounting groove 113, and the fourth end of the contouring part 133 is interference-fitted with the mounting groove 113. The third end of the contouring part 133 can serve as an insertion end. The third end of the contouring part 133 is first inserted into the mounting groove 113 to facilitate the initial installation of the contouring part 133. Subsequently, as the contouring part 133 moves gradually, the fourth end of the contouring part 133 is inserted into the mounting groove 113 and forms an interference fit with the mounting groove 113, thereby fixing the contouring part 133.

[0082] Further reference Figure 1 and Figure 11 When both the magnet 12 and the insulating pre-tightening member 13 are installed in the magnet slot 111, a plastic material can be injected into the gap formed between the magnet 12, the insulating pre-tightening member 13, and the rotor body 11 to form an injection molded part 15. During injection molding of the injection molded part 15, the pre-tightening portion 131 of the insulating pre-tightening member 13 radially abuts against the magnet 12 to prevent the magnet 12 from shifting relative to the magnet slot 111 due to impact and compression from the plastic material during injection, thus ensuring the stability of the magnet 12's position. After injection molding, the shape of the injection molded part 15 remains fixed, ensuring that the relative positions between the magnet 12, the insulating pre-tightening member 13, and the rotor body 11 remain fixed during motor operation, and improving the overall strength of the stator and rotor assembly 1.

[0083] Specifically, when the motor rotates, the injection molded part 15 covers the insulating pre-tightening member 13. For example, the injection molded part 15 can at least cover the pre-tightening portion 131 of the insulating pre-tightening member 13, so that the insulating pre-tightening member 13 can limit the injection molded part 15 along the circumferential direction of the motor, thereby preventing the injection molded part 15 from moving relative to the insulating pre-tightening member 13 due to centrifugal force during motor operation. At the same time, the injection molded part 15 covers the magnet 12 to limit the axial direction of the magnet 12, thereby preventing the magnet 12 from moving relative to the injection molded part 15 due to centrifugal force during motor operation. Therefore, due to the limiting relationship between the rotor body 11, the insulating pre-tightening member 13, the injection molded part 15, and the magnet 12, the relative positions of the rotor body 11, the insulating pre-tightening member 13, the injection molded part 15, and the magnet 12 can be kept constant or extremely difficult to change during motor operation, ensuring the symmetry of the magnetic field when the motor rotates.

[0084] Further reference Figure 9The stator body 14 is provided with a plurality of stator teeth 143 and a plurality of stator slots 141. The stator slots 141 can be located between two adjacent stator teeth 143. The stator teeth 143 can be parallel teeth, meaning that the width of the tooth portion of the stator tooth 143 relative to the two sidewalls is equal in the radial direction everywhere. Furthermore, the stator body 14 also has a second notch 142 communicating with the stator slots 141, the second notch 142 being located on the radially inward side of the stator slot 141.

[0085] In some specific embodiments, in the rotor body 11, the arc contours of the rotor teeth 114 are not concentrically arranged with respect to the rotor body 11, and the centers of the arc contours formed by multiple rotor teeth 114 are distributed sequentially along a circular ring; the diameter of the arc contours formed by the rotor teeth 114 can be 0.70 to 0.75 times the diameter of the rotor body 11, for example, the diameter of the arc contours formed by the rotor teeth 114 is 62.21 mm, and the diameter of the rotor body 11 is 85.12 mm.

[0086] Further reference Figure 6 The first width D1 of the first notch 1121 is 0.53 to 0.55 times the second width D2 of the main cavity 1111; the first radial thickness T1 of the first notch 1121 is 0.04 to 0.06 times the first length H1 of the main cavity 1111; and the second length H2 of the connecting cavity 1112 is 0.52 to 0.55 times the third width D3 of the end of the connecting cavity 1112 away from the main cavity 1111. The width directions of the first notch 1121, the main cavity 1111, and the connecting cavity 1112 can be perpendicular to the radial direction of the rotor body 11, while the thickness direction of the first notch 1121 and the length directions of the main cavity 1111 and the connecting cavity 1112 can be parallel to the radial direction of the rotor body 11.

[0087] Further reference Figure 10 In the stator body 14, the ratio of the number of stator slots 141 to the number of magnet slots 111 is 6:5. For example, the number of stator slots 141 is 12, and the number of magnet slots 111 is 10. The fourth width D4 of the end of the stator slot 141 facing the inner side of the stator body 14 radially is 0.6 to 0.7 times the fifth width D5 of the end of the stator slot 141 facing the outer side of the stator body 14 radially. The second thickness T2 of the second notch 142 is 0.15 to 0.17 times the third length H3 of the stator slot 141; the sixth width D6 of the second notch 142 is 0.17 to 0.19 times the fourth width D4 of the end of the stator slot 141 facing the inner side of the stator body 14 radially. The width direction of the stator slot 141 and the second notch 142 can be perpendicular to the radial direction of the rotor body 11; the thickness direction of the second notch 142 and the length direction of the stator slot 141 can be parallel to the radial direction of the rotor body 11.

[0088] By setting the dimensions of the rotor body 11 and stator body 14, the number of stator teeth 143 and rotor teeth 114 as described above, the magnetic load required by the motor using the stator-rotor assembly 1 of the present invention can be increased, the utilization rate of motor materials can be improved, the cogging torque can be reduced, the noise and vibration can be reduced, the back EMF waveform can be made closer to a sine wave, which is convenient for the controller connected to the motor to drive, and the harmonic loss can be reduced.

[0089] like Figures 12 to 16 As shown, the present invention also provides a permanent magnet brushless motor. The permanent magnet brushless motor includes a housing 2, electronic components 3, and clamping components 4, and may also include the aforementioned stator and rotor assembly 1, bearing bracket 8, sealing plate 7, and other components.

[0090] The outer casing 2 may include a first casing 28 and a second casing 29, which are axially distributed and joined together, forming a receiving cavity. The receiving cavity can accommodate components such as electronic components 3, clamping parts 4, bearing supports 8, stator and rotor assemblies 1, control circuit boards 6, and sealing plates 7. The outer casing 2 may be made of aluminum. During operation, the motor generates heat, especially at the stator and rotor assembly 1. Aluminum can quickly and effectively conduct heat to the outside, ensuring that the temperature inside the receiving cavity remains within an acceptable range.

[0091] Further reference Figures 14 to 16The outer casing 2 is provided with a heat dissipation protrusion 21 protruding from the inner wall of the outer casing 2 toward the interior of the outer casing 2. Specifically, the heat dissipation protrusion 21 can be formed by a portion of the inner wall of the first casing 28 protruding toward the interior of the outer casing 2. The heat dissipation protrusion 21 includes at least one heat dissipation plane 211, which is disposed on the side facing the axis of the motor and extends downward along the inner wall of the outer casing 2. Preferably, there is one heat dissipation plane 211, and the plane containing the heat dissipation plane 211 is parallel to the axis of the motor. The heat dissipation plane 211 can be used for thermal contact with the electronic component 3. At this time, the heat dissipation plane 211 can transfer heat with the electronic component 3, thereby absorbing the heat of the electronic component 3 and dissipating it to the outside. The heat dissipation plane 211 can be an elongated surface, and the length direction of the heat dissipation plane 211 can be perpendicular to the axis of the motor. The heat dissipation plane 211 and the electronic component 3 can be in direct contact, so that the heat of the electronic component 3 can be directly conducted to the heat dissipation plane 211, thereby achieving thermal contact between the heat dissipation plane 211 and the electronic component 3; or, a heat conduction component can be provided between the heat dissipation plane 211 and the electronic component 3, and the heat dissipation plane 211 and the electronic component 3 can be indirectly contacted through the heat conduction component, so that the heat of the electronic component 3 can be conducted to the heat conduction component and then to the heat dissipation plane 211, thereby achieving thermal contact between the heat dissipation plane 211 and the electronic component 3. Due to manufacturing errors in the heat dissipation protrusion 21 and installation errors between the heat dissipation protrusion 21 and the electronic component 3, the heat dissipation plane 211 may be offset from the electronic component 3. To compensate for these manufacturing and installation errors, the area of ​​the heat dissipation plane 211 is larger than the sum of the projected areas of all electronic components 3 along the direction perpendicular to the center line of the outer casing 2 on the heat dissipation plane 211. This ensures that even when the heat dissipation plane 211 is offset from the electronic component 3, it can still maintain full contact with the surface of the electronic component 3, thereby facilitating heat transfer. Although a larger area of ​​the heat dissipation plane 211 can also provide better heat dissipation for the electronic component 3, a larger area of ​​the heat dissipation plane 211 will result in a larger space occupied by the heat dissipation protrusion 21 and a heavier weight. To ensure that the heat dissipation protrusion 21 can meet the requirement of rapid heat dissipation for the electronic component 3 and keep the weight of the outer casing 2 low, the ratio of the sum of the projected areas of all electronic components 3 along the direction perpendicular to the center line of the outer casing 2 on the heat dissipation plane 211 to the area of ​​the heat dissipation plane 211 can be 1:(1.8~2.5). Among them, the projections of all electronic components 3 along the direction perpendicular to the center line of the outer casing 2 can all fall on the heat dissipation plane 211.

[0092] In some specific embodiments, a heat conduction component, specifically a heat sink 5, can be provided between the heat dissipation plane 211 and the electronic component 3. The heat sink 5 is positioned between the electronic component 3 and the heat dissipation plane 211. The heat sink 5 abuts against both the electronic component 3 and the heat dissipation plane 211. The heat sink 5 is made of a material with good thermal conductivity, and its heat dissipation efficiency is greater than that of the outer casing 2. For example, the heat sink 5 is a heat-dissipating silicon sheet, which is sheet-shaped and can fit perfectly onto the surface of the heat dissipation plane 211. By providing the heat sink 5 between the electronic component 3 and the heat dissipation plane 211, heat from the electronic component 3 can be quickly transferred to the heat sink 5, and then quickly transferred to the heat dissipation protrusion 21, improving the heat dissipation effect of the electronic component 3. Furthermore, since the heat sink 5 is relatively expensive, using a combination of the heat sink 5 and the heat dissipation protrusion 21 to dissipate heat from the electronic component 3 can reduce costs while ensuring efficient heat dissipation.

[0093] The shape of the heat sink 5 can be adapted to the overall structure formed by multiple electronic components 3. That is, the length direction of the heat sink 5 can be parallel to the arrangement direction of the electronic components 3, so that the heat sink 5 can fully contact the multiple electronic components 3. Furthermore, since the length direction of the heat dissipation plane 211 is also parallel to the arrangement direction of the electronic components 3, the heat sink 5 can also fully contact the heat dissipation plane 211, thereby improving the heat dissipation effect of the combination of the heat sink 5 and the heat dissipation protrusion 21 on the electronic components 3. Specifically, the projections formed by the multiple electronic components 3 along the direction perpendicular to the center line of the outer casing 2 can all fall on the heat sink 5, so that the surface of the electronic components 3 facing the heat sink 5 is completely in contact with the heat sink 5.

[0094] Due to manufacturing errors in the heat sink 5 and installation errors between the heat sink 5 and electronic components 3, misalignment may occur between the heat sink 5 and the electronic components 3. To compensate for these manufacturing and installation errors, the area of ​​the heat sink 5 is larger than the sum of the projected areas of all electronic components 3 along the axis perpendicular to the outer casing 2 on the heat sink 5. This ensures that even when misalignment occurs, the heat sink 5 maintains full contact with the surface of the electronic components 3, thus facilitating heat transfer. Furthermore, to avoid excessive cost due to an excessively large heat sink 5 area, the ratio of the sum of the projected areas of all electronic components 3 along the axis perpendicular to the outer casing 2 on the heat sink 5 to the area of ​​the surface of the heat sink 5 facing the electronic components 3 can be 1:(1.1~1.3). In this case, all projections of the electronic components 3 along the axis perpendicular to the outer casing 2 fall on the heat sink 5.

[0095] Further reference Figure 12In some specific embodiments, heat dissipation ribs 22 are formed on the outer wall of the housing 2, and the heat dissipation ribs 22 are correspondingly arranged with the heat dissipation protrusions 21. When the heat of the electronic component 3 is transferred to the heat dissipation protrusions 21, the heat will be further transferred to the outer wall of the housing 2 to dissipate heat to the outside. By forming heat dissipation ribs 22 on the outer wall of the housing 2, the surface area of ​​the outer wall of the housing 2 can be increased, thereby increasing the heat dissipation area of ​​the housing 2 and improving the heat dissipation effect of the electronic component 3. The heat dissipation ribs 22 are sheet-like and extend along the axial direction. One or more heat dissipation ribs 22 can be provided, preferably multiple heat dissipation ribs 22 are provided, and multiple heat dissipation ribs 22 are evenly distributed along the circumference of the motor.

[0096] In existing motors, the heat dissipation plane 211, which contacts the electronic component 3 to dissipate heat, is perpendicular to the motor axis, resulting in a complex structure for the housing 2. Molds for molding the housing 2 are generally top-and-bottom molds. The presence of the heat dissipation plane 211, perpendicular to the motor axis, increases the difficulty of mold design and demolding the housing 2. In this application, the heat dissipation plane 211 is designed to extend downwards from the inner wall of the housing 2, simplifying the housing 2's structure. Specifically, after the electronic component (IGBT) 3 is electrically inserted into the control circuit board 6, at least a portion of its axially extending working surface can directly or indirectly contact the heat dissipation plane 211. This design facilitates both mold design and demolding of the housing 2.

[0097] Further reference Figure 14 and Figure 15 Electronic component 3 is electrically connected to control circuit board 6, and electronic component 3 can be vertically mounted on control circuit board 6. Electronic component 3 includes a main body 31 and pins 32 connected to the main body 31. Pins 32 can be electrically connected to control circuit board 6, for example, pins 32 can be soldered to pads on control circuit board 6 to achieve electrical connection between electronic component 3 and control circuit board 6. The main body 31 can be located on the side of control circuit board 6 facing stator and rotor assembly 1; in the motor, control circuit board 6 is located at one end of the receiving cavity, and stator and rotor assembly 1 is located at the other end of the receiving cavity, which can form a large space between control circuit board 6 and stator and rotor assembly 1. By setting the main body 31 on the side of control circuit board 6 facing stator and rotor assembly 1, the internal space of the motor can be fully utilized, and the locking operation between electronic component 3 and housing 2 can also be facilitated. Specifically, the stator and rotor assembly 1 needs to be wired to the control circuit board 6, and the axial end of the stator and rotor assembly 1 must be provided with clearance space. This clearance space is just enough for the electronic components 3 to be installed and for the heat dissipation protrusion 11 to be formed. There is no need to change the external shape of the motor housing, thereby achieving the purpose of making full use of the internal space of the motor. It also ensures that the assembly structure of the motor in the corresponding product does not need to be re-molded, simplifying the process.

[0098] Further reference Figure 15 Multiple electronic components 3 can be provided, and these multiple electronic components 3 can be located at the edge of the motor control circuit board 6. These multiple electronic components 3 can be evenly arranged in a first direction and respectively make thermal contact with the heat dissipation plane 211, so that a large number of electronic components 3 can all make thermal contact with the heat dissipation plane 211. The first direction can be parallel to the length direction of the heat dissipation plane 211.

[0099] Since electronic component 3 is vertically mounted on control circuit board 6, its length direction can be parallel to the motor axis. In this case, the width direction of electronic component 3 is parallel to the length direction of heat dissipation plane 211. Therefore, heat dissipation plane 211 can contact a large number of electronic components 3; for example, all electronic components 3 can be connected to heat dissipation plane 211. By connecting heat dissipation plane 211 to all or a large number of electronic components 3, the arrangement of multiple electronic components 3 can be more compact, reducing the space required by multiple electronic components 3. Furthermore, the housing 2 does not need to reserve much space to accommodate the electronic components 3, allowing for a more compact structure. Specifically, four electronic components 3 can be provided, evenly spaced along the length direction of heat dissipation plane 211. The electronic components 3 can specifically be IGBTs (Insulated Gate Bipolar Transistors).

[0100] Further reference Figure 16 The clamping member 4 is located on the side of the electronic component 3 opposite to the heat dissipation protrusion 21, and clamps the electronic component 3 to the heat dissipation protrusion 21. Specifically, locking holes 41 can be provided at opposite ends of the clamping member 4. When the clamping member 4 clamps the electronic component 3, the locking member 43 can pass through the locking hole 41 and be fixedly connected to the heat dissipation protrusion 21 to achieve clamping and fixing of the electronic component 3. The locking hole 41 can be a through hole or a threaded hole, and the locking member 43 can be a screw. After the locking member 43 passes through the locking hole 41 or is threadedly connected to the clamping member 4 through the locking hole 41, it will move further to be threadedly connected to the heat dissipation protrusion 21 to achieve clamping and fixing of the electronic component 3.

[0101] One or more clamping members 4 may be provided, each clamping member 4 being used to clamp at least one electronic component 3 onto the heat dissipation protrusion 21. In this embodiment, one clamping member 4 is provided, extending along the arrangement direction of the electronic components 3, so that one clamping member 4 can be used to clamp multiple electronic components 3. Preferably, one clamping member 4 can perform a locking action on all electronic components 3. When the clamping member 4 clamps multiple electronic components 3, the clamping member 4 may be provided with two locking holes 41, distributed at opposite ends of the clamping member 4, so that two locking members 43 can pass through the corresponding locking holes 41 to be fixedly connected to the heat dissipation protrusion 21, thereby applying a clamping force to the opposite ends of the clamping member 4. By applying a clamping force to both ends of the clamping member 4, multiple electronic components 3 can be clamped and fixed, making the clamping and fixing process of multiple electronic components 3 more convenient and faster. The clamping member 4 may be a plate, and it can be used to clamp all electronic components 3. Compared to the multiple repetitive locking processes in the prior art, the above-described configuration only requires a single locking process, making it convenient and effective. Furthermore, in other embodiments, multiple clamping members 4 can be provided, spaced apart along the arrangement direction of the electronic components 3. Each clamping member 4 can be used to clamp one electronic component 3, or a portion of the clamping members 4 can be used to clamp one electronic component 3, a portion of the clamping members 4 can be used to clamp a portion of the electronic components 3, or each clamping member 4 can be used to clamp a portion of the electronic components 3.

[0102] In some specific embodiments, the clamping component 4 is made of galvanized steel sheet. Galvanized steel sheet has a low cost, which can reduce the production cost of the clamping component 4, and galvanized steel sheet has strong corrosion resistance. Since the temperature inside the motor, i.e., the housing cavity of the outer casing 2, is high during motor operation, moisture may be generated inside the motor. This moisture may come into contact with the clamping component 4 located in the housing cavity. By using galvanized steel sheet for the clamping component 4, corrosion caused by contact with moisture can be effectively prevented, thereby reducing the risk of short circuits in electronic components 3 due to corrosion of the clamping component 4 and extending the service life of the motor.

[0103] In some specific embodiments, an insulating sleeve 42 is also fitted onto the clamping member 4. The insulating sleeve 42 is made of insulating material, such as a heat-shrinkable PVC sleeve, to enhance the insulation effect between the clamping member 4 and the electronic component 3, thereby reducing the damage of surges to the electronic component 3 and providing overvoltage protection. Therefore, when the motor is used in equipment such as air conditioner outdoor units that need to be placed outdoors, the motor with overvoltage protection function can have a better resistance to lightning strikes.

[0104] Further reference Figure 13Because the control circuit board 6 generates heat during operation, the temperature of the space surrounding the control circuit board 6 is higher than that of the outside environment. This causes the cooler gases in the space surrounding the control circuit board 6 to condense and produce water vapor. To prevent this water vapor from contacting the stator and rotor assembly 1 and causing corrosion, short circuits, etc., a sealing plate 7 is provided inside the motor housing 2. The sealing plate 7 divides the accommodating cavity inside the housing 2 into a first chamber 23 for accommodating the control circuit board 6 and a second chamber 24 for accommodating the stator and rotor assembly 1. Therefore, the water vapor generated by the heat generated by the control circuit board 6 is blocked by the sealing plate 7 and cannot enter the second chamber 24. This also prevents the water vapor in the first chamber 23 from entering the second chamber 24 by airflow and adhering to the stator and rotor assembly 1, thus affecting the stator and rotor assembly 1.

[0105] To further improve the sealing performance between the first chamber 23 and the second chamber 24, a sealing element 71, which can be a sealing ring, is provided between the sealing plate 7 and the outer casing 2. This sealing element 71 is used to seal the connection between the sealing plate 7 and the outer casing 2, thereby improving the sealing performance between the first chamber 23 and the second chamber 24 and preventing condensate in the first chamber 23 from entering the second chamber 24 and affecting the stator and rotor assembly 1.

[0106] In some specific embodiments, the outer shell 2 is provided with a through hole 25 penetrating the outer shell 2, and the through hole 25 communicates with the first chamber 23. The through hole 25 can be located on the side of the first chamber 23 near the sealing plate 7, specifically on the lower side of the first chamber 23. Water vapor in the first chamber 23 will condense into water droplets on the inner wall of the outer shell 2. The water droplets will slide off due to gravity, and when the water droplets flow to the through hole 25, they can flow out of the first chamber 23 through the through hole 25, thereby discharging the water droplets in the first chamber 23; in addition, water vapor in the first chamber 23 can also be discharged through air convection.

[0107] Further reference Figure 17 Since the stator and rotor assembly 1 also generates heat during operation, leading to a rise in temperature within the second chamber 24, the outer casing 2 is provided with a heat dissipation hole 271 penetrating the outer casing 2 to prevent excessive temperature within the second chamber 24 from affecting the operation of the stator and rotor assembly 1. The heat dissipation hole 271 communicates with the second chamber 24, allowing heat within the second chamber 24 to be dissipated to the outside through the heat dissipation hole 271. Specifically, the heat dissipation hole 271 can be located on the side of the second chamber 24 adjacent to the sealing plate 7, offset axially from the stator and rotor assembly 1. This serves two purposes: firstly, it protects the stator and rotor assembly 1; secondly, since hot air rises, placing the heat dissipation hole 271 on the upper side of the second chamber 24 facilitates heat dissipation. The heat dissipation hole 271 can be specifically located on the upper side of the second chamber 24.

[0108] In some specific embodiments, the heat dissipation hole 271 can be formed by stamping on a portion of the wall of the outer casing 2. Specifically, the outer casing 2 can include a body portion 26 and a positioning portion 27. The positioning portion 27 is stamped so that it bends toward the inside of the outer casing 2, and part of the positioning portion 27 is hollowed out from the body portion 26. For example, both ends of the positioning portion 27 are connected to the body portion 26, while the center portion of the positioning portion 27 is hollowed out from the body portion 26. The part where the positioning portion 27 is separated from the body portion 26 forms a gap, which can serve as a heat dissipation hole 271 to dissipate heat from the second chamber 24, and the positioning portion 27 bent toward the inside of the outer casing 2 can also position or support the components inside the outer casing 2.

[0109] Further reference Figure 13 and Figure 17 The stator and rotor assembly 1 includes a rotating shaft 17, one end of which is connected to a bearing 16. For mounting the bearing 16, the motor is equipped with a bearing bracket 8 to support it. The bearing bracket 8 can be connected to the housing 2 via bolts, thus fixing the bearing bracket 8 within the second chamber 24. To reduce the weight of the motor, the bearing bracket 8 can be provided with a hollow portion 81. The hollow portion 81 reduces the weight of the bearing bracket 8, thereby reducing the weight of the motor. Furthermore, the bearing bracket 8 can be stacked with a sealing plate 7, and the bearing bracket 8 can be locked to the sealing plate 7 by a fastener 82, which can be a screw, pin, or other component capable of fixed connection.

[0110] To facilitate the installation of the bearing bracket 8, the bearing bracket 8 can abut against the positioning part 27. Once the bearing bracket 8 abuts against the positioning part 27, the bearing bracket 8 can be positioned. Then, the bearing bracket 8 is connected to the outer shell 2 and the sealing plate 7.

[0111] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A stator-rotor assembly characterized by, The application relates to a rotor body (11) provided with a magnetic steel slot (111); a magnetic steel (12) installed in the magnetic steel slot (111); an insulation pre-tightening piece (13) provided separately from the rotor body (11) and connected with the rotor body (11), wherein the insulation pre-tightening piece (13) comprises a pre-tightening part (131) extending to the magnetic steel slot (111), the pre-tightening part (131) is compressed by the magnetic steel (12) in the radial direction to compress and fix the magnetic steel (12) and compensate for the deviation of the magnetic steel (12) in the radial direction, and the end of the magnetic steel (12) towards the inside of the rotor body (11) is insulated and separated from the rotor body (11); and an injection molding piece (15) covering the insulation pre-tightening piece (13) and the magnetic steel (12) to ensure the relative position stability of the insulation pre-tightening piece (13), the magnetic steel (12) and the rotor body (11). The rotor body (11) is provided with a magnetic isolation bridge (112) arranged at the end of the magnetic steel slot (111) towards the outside of the rotor body (11); the pre-tightening part (131) drives the magnetic steel (12) to be compressed on the magnetic isolation bridge (112) in the radial direction to interference-fix the magnetic steel (12) in the magnetic steel slot (111) in the radial direction. Preferably, the magnetic isolation bridge (112) is provided with at least one pair of magnetic isolation bridges (112), one pair of the magnetic isolation bridges (112) is symmetrically arranged about the diameter of the rotor body (11) in the circumferential direction, a first gap (1121) communicating with the magnetic steel slot (111) is formed between one pair of the magnetic isolation bridges (112), the magnetic steel slot (111) comprises a main cavity (1111) for accommodating the magnetic steel (12) and a connecting cavity (1112) for accommodating the pre-tightening part (131); the first width (D1) of the first gap (1121) is 0.53-0.55 times the second width (D2) of the main cavity (1111); and the first thickness (T1) of the first gap (1121) in the radial direction is 0.04-0.06 times the first length (H1) of the main cavity (1111). Preferably, the second length (H2) of the connecting cavity (1112) is 0.52-0.55 times the third width (D3) of the end of the connecting cavity (1112) away from the main cavity (1111). Preferably, the pre-tightening part (131) comprises an abutting part (1311) and a guide part (1312) arranged in sequence along the installation direction of the magnetic steel (12); the distance between the guide part (1312) and the magnetic isolation bridge (112) in the radial direction is greater than the length direction of the magnetic steel (12); and the distance between the abutting part (1311) and the magnetic isolation bridge (112) in the radial direction is smaller than the length direction of the magnetic steel (12), so that the abutting part (1311) abuts against the magnetic steel (12) during the installation of the magnetic steel (12) in the magnetic steel slot (111).

2. The stator-rotor assembly of claim 1, wherein ​ ​ ​ ​ Preferably, the guiding part (1312) is connected with one end of the abutting part (1311) to form a guiding slope (1313) for guiding the connection between the magnetic steel (12) and the abutting part (1311).

3. The stator-rotor assembly of claim 1, wherein The insulating pre-tightening piece (13) comprises a base part (132), one end of the pre-tightening part (131) is connected with the base part (132), and the base part (132) abuts with the rotor body (11) along the axial direction of the rotor body (11) to limit the insulating pre-tightening piece (13). Preferably, the pre-tightening part (131) is made of a material with plastic deformation ability.

4. The stator-rotor assembly of claim 1, wherein The insulating pre-tightening piece (13) further comprises a profiling part (133), the rotor body (11) is provided with an embedded groove (113) which is in communication with the magnetic steel groove (111) and located on the side of the magnetic steel groove (111) facing the inner side of the rotor body (11), and at least a part of the profiling part (133) is profiled with the embedded groove (113) and is in interference fit with the embedded groove (113). Preferably, the stator body (14) is further provided with a stator groove (141), and the ratio of the number of the stator groove (141) to the number of the magnetic steel groove (111) is 6:

5. Preferably, the fourth width (D4) of the stator groove (141) at one end of the stator groove (141) facing the inner side of the stator body (14) is 0.6-0.7 times the fifth width (D5) of the stator groove (141) at one end of the stator groove (141) facing the outer side of the stator body (14). Preferably, the stator body (14) is further provided with a second notch (142) which is in communication with the stator groove (141) and located on the side of the stator groove (141) facing the inner side in the radial direction; the second thickness (T2) of the second notch (142) is 0.15-0.17 times the third length (H3) of the stator groove (141); and the sixth width (D6) of the second notch (142) is 0.17-0.19 times the fourth width (D4) of the stator groove (141) at one end of the stator groove (141) facing the inner side of the stator body (14).

5. The stator-rotor assembly of claim 1, wherein The rotor body (11) is provided with a plurality of rotor teeth (114), and the inner walls between adjacent rotor teeth (114) form the magnetic steel groove (111); the outer end of the rotor tooth (114) forms a circular arc profile, and the circular arc profiles formed by a plurality of rotor teeth (114) correspond to a plurality of circular centers connected in sequence to form a circular ring, and the circular ring is concentrically arranged with the rotor body (11); Preferably, the diameter of the circular arc profile formed by the rotor tooth (114) is 0.70-0.75 times the diameter of the rotor body (11).

6. A permanent-magnet brushless motor, characterized by It comprises: The stator-rotor assembly (1) according to any one of claims 1 to 5; The stator-rotor assembly (1) according to any one of claims 1 to 5; A housing (2) is provided with a heat dissipation protrusion (21) protruding from the inner wall of the housing (2) towards the inside of the housing (2), the heat dissipation protrusion (21) comprises at least one heat dissipation plane (211), the heat dissipation plane (211) is arranged towards the side of the axis of the motor, and the heat dissipation plane (211) extends downward along the inner wall of the housing (2); A plurality of electronic components (3), at least one of the electronic components (3) is in thermal contact with the heat dissipation plane (211) to transfer heat with the heat dissipation protrusion (21); A pressing member (4) is arranged on the side of the electronic component (3) away from the heat dissipation protrusion (21), and the electronic component (3) is pressed to the heat dissipation protrusion (21).

7. The permanent-magnet brushless motor of claim 6, wherein A plurality of the electronic components (3) are arranged on the edge of the control circuit board (6) of the motor, and are uniformly distributed along the first direction and are in thermal contact with the heat dissipation plane (211), respectively, the pressing member (4) extends along the arrangement direction of the electronic component (3), and one of the pressing members (4) presses at least one of the electronic components (3) to the heat dissipation protrusion (21); Preferably, a plurality of the electronic components (2) are arranged on the edge of the control circuit board (5) of the motor, and are uniformly distributed along the first direction and are in thermal contact with the heat dissipation plane (111), respectively, the pressing member (3) extends along the arrangement direction of the electronic component (2), and a plurality of the pressing members (3) press at least one of the electronic components (2) to the heat dissipation protrusion, and a plurality of the pressing members (3) are arranged downward along the inner wall of the housing (1) with intervals. Preferably, the plane where the heat dissipation plane (111) is arranged is parallel to the axis of the permanent magnet brushless motor. Preferably, the opposite ends of the pressing member (4) are respectively provided with locking holes (41), and the pressing member (4) is fixedly connected to the heat dissipation protrusion (21) through a locking member (43) arranged in the locking hole (41).

8. The permanent-magnet brushless motor of claim 6, wherein, The pressing member (4) is sleeved with an insulating sleeve (42) to make the pressing member (4) in insulating contact with the electronic component (3); Preferably, the insulating sleeve (42) is a heat shrinkable sleeve made of PVC material, and the pressing member (4) is made of galvanized steel plate material. Preferably, the ratio of the sum of the projection areas of all the electronic components (3) on the heat dissipation plane (211) to the area of the heat dissipation plane (211) is 1:(1.8-2.5) in the direction perpendicular to the center line of the housing (2), and the projections of all the electronic components (3) fall on the heat dissipation plane (211). Preferably, at least one of the electronic components (3) is in direct contact with the heat dissipation plane (211) to achieve thermal contact; Or, the motor further comprises a heat dissipation fin (5) arranged between the electronic component (3) and the heat dissipation plane (211), and at least one of the electronic components (3) is in indirect contact with the heat dissipation plane (211) through the heat dissipation fin (5) to achieve thermal contact. Preferably, the sum of the projection area of all the electronic components (3) on the heat dissipation fin (5) in the direction perpendicular to the center line of the shell (2) and the area ratio of the surface of the heat dissipation fin (5) facing the electronic components (3) are 1:(1.1-1.3), and the projections of all the electronic components (3) fall on the heat dissipation fin (5).

9. The permanent-magnet brushless motor of claim 6, wherein, The outer wall of the shell (2) is formed with heat dissipation ribs (22) arranged correspondingly to the heat dissipation protrusions (21) to increase the heat dissipation area of the shell (2); Preferably, it further comprises a control circuit board (6), the electronic components (3) are electrically connected with the control circuit board (6), and the main body part (31) of the electronic components (3) is arranged on the side of the control circuit board (6) facing the stator-rotor assembly (1) of the motor. Preferably, the shell (2) is formed with a containing cavity, and the motor further comprises a sealing plate (7) arranged in the shell (2) and separating the containing cavity into a first cavity (23) and a second cavity (24), the control circuit board (6) is arranged in the first cavity (23), and the second cavity (24) is used for accommodating the stator-rotor assembly (1). Preferably, a sealing element (71) is arranged between the sealing plate (7) and the shell (2), and the sealing element (71) is used for sealing the connection between the sealing plate (7) and the shell (2) to seal and separate the first cavity (23) and the second cavity (24). Preferably, the shell (2) is further provided with a through hole (25) penetrating through the shell (2), the through hole (25) communicates with the first cavity (23), and the through hole (25) is arranged on the side of the first cavity (23) adjacent to the sealing plate (7). Preferably, the shell (2) is further provided with a heat dissipation hole (271) penetrating through the shell (2), the heat dissipation hole (271) communicates with the second cavity (24), and the heat dissipation hole (271) is arranged on the side of the second cavity (24) adjacent to the sealing plate (7) to be arranged in axial misalignment with the stator-rotor assembly (1).

10. The permanent-magnet brushless motor of claim 9, wherein, The shell (2) comprises a body part (26) and a positioning part (27), the positioning part (27) is formed inwardly protruding towards the second cavity (24), and part of the positioning part (27) is hollowed out with the body part (26) to form the heat dissipation hole (271) between the positioning part (27) and the body part (26); Preferably, it further comprises a bearing support (8) abutting against the end surface of the positioning part (27) in the axial direction of the motor, and the bearing support (8) is provided with a hollow part (81). Preferably, the sealing plate (7) and the bearing support (8) are arranged in stacking along the axial direction of the motor, and the sealing plate (7) and the bearing support (8) are locked and fixed by a fixing element (82).

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