Motor and elevator door

Abstract

The present application discloses a motor and an elevator door. The motor comprises a housing (1), and a stator part (2) and a rotor part (3) which are arranged in the housing (1). The stator part (2) comprises a stator core (20) and a frame (21) which are mated with each other. At least one first slot (201) and / or first snap-fit block (207) is provided on the outer wall of the stator core (20). Second snap-fit blocks (210) having one-to-one correspondence to the first slots (201) are protruded from the inner wall of the frame (21) and / or second slots (211) having one-to-one correspondence to the first snap-fit blocks (207) are provided on the inner wall of the frame (21). The first slots (201) or the second slots (211) have outer notches (202). At least one pair of limiting blocks (203) are arranged on the inner side wall of each outer notch (202); and lines connecting two opposite end points of each pair of the limiting blocks (203) expand towards the opening thereof from the axis of symmetry passing through the center of the stator core (20). The present application greatly conserves materials and parts, reduces the production costs, and solves the technical problems of a high machining precision requirement due to single-directional force application on slot sidewalls and insufficient tolerance margins during press fitting, and inability to well disperse the acting force due to a single relative limiting structure between the stator core (20) and tooth parts.

Description

Motors and elevator doors Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a motor and an elevator door. Background Art

[0002] Elevators are widely used in buildings. One of their components, elevator door opening motors, currently have the following problems during the manufacturing process:

[0003] The stator part of the motor includes a stator core and a plurality of teeth. The most common method in the prior art is to use a sheet-shaped integral molding direction between the stator core and the plurality of teeth, and then press them together by axial pressing. This method will cause a lot of waste, resulting in a high cost disadvantage in the manufacturing process. Another method is that the stator core and the plurality of teeth are split structures, and the plurality of teeth are inserted into the slot body of the stator core through a pressing process. In this method, the force on the side wall of the slot body during the pressing action is single, and the redundancy is small, resulting in high processing accuracy, and it is usually a straight section surface. The relative limiting structure between the stator core and the teeth is single, and it cannot disperse the force well.

[0004] Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the utility model provides a motor and an elevator door that can meet the installation accuracy while significantly saving materials and reducing production costs. It solves the technical problems that the side walls of the trough body are subjected to a single force in the pressing process, the redundancy is small, resulting in high processing accuracy, and the surface is usually a straight section. The relative limiting structure between the stator core and the tooth part is single and cannot disperse the force well.

[0006] The utility model is achieved through the following technical solutions:

[0007] A motor comprises a housing, a stator portion and a rotor portion arranged in the housing, wherein the stator portion comprises a stator core and a frame matched with each other;

[0008] The outer wall of the stator core is provided with at least one first slot body and / or a first clamping block, and the inner wall of the frame is provided with a second clamping block corresponding to the first slot body and / or a second slot body corresponding to the first clamping block, wherein the first clamping block and the second clamping block are respectively accommodated in the second slot body and the first slot body with interference fit;

[0009] The first slot body or the second slot body includes an outer notch, and the outer notch tends to converge toward its opening along a symmetry axis passing through the center of the stator core to guide the inward convergence of the stator core and the frame;

[0010] The motor also includes at least one pair of symmetrically arranged limit blocks, which are arranged on the inner side walls forming the first slot body or the second slot body, or on the outer side walls of the skeleton. The line connecting the two opposite end points of the limit blocks tends to expand toward its opening along the symmetry axis passing through the center of the stator core, so as to abut and limit the inner structure of the stator core and the skeleton after they are matched.

[0011] Furthermore, the outer notch is in a regular "X" shape with its opening as a reference, and the opening of the outer notch is formed at the outer edge of the first trough body or the second trough body.

[0012] Furthermore, the limiting block is arched in an axial section perpendicular to the motor, and the circular angle corresponding to the arch is 160-240°.

[0013] Furthermore, the limiting blocks are semicircular, and the diameter direction of a pair of limiting blocks is in an inverted eight-shaped shape based on the openings thereof, so as to abut and limit the inner structure of the stator core and the frame after they are matched.

[0014] Furthermore, the stator core is formed by at least two stator iron blocks being fastened together in sequence, and a butt joint is formed at the fastening point of the transition fitting of at least two of the stator iron blocks. The butt joint is squeezed during the interference fitting process between the stator core and the drive shaft of the motor to compensate for the axial tilting tendency of the stator core, so that the gap between the stator part and the rotor part is uniform.

[0015] Furthermore, when the stator core and the frame are matched, the joint can serve as a marker to facilitate subsequent wire leading and wiring processes.

[0016] Furthermore, the ratio of the sum of the arc lengths of the plurality of outer notches to the outer circumference of the stator core is 0.6-0.65, so that the minimum distance between two adjacent stator windings wound on the skeleton is not less than 2.5 mm.

[0017] Furthermore, the ratio of the depth of the first slot body or the second slot body to the difference between the maximum outer diameter and the minimum outer diameter of the stator core is 0.45-0.6.

[0018] Furthermore, the housing includes a first shell and a second shell, the first shell and the second shell are fixedly connected and both can accommodate the stator part.

[0019] Furthermore, a protection cavity is provided on a side of the first shell facing the stator part, and the protection cover of the motor is partially accommodated in the protection cavity.

[0020] Furthermore, the motor also includes a transmission shaft, and the transmission shaft and the first housing and the transmission shaft and the second housing are rotatably connected via bearings, and the protective cover is fixedly connected to the transmission shaft and can accommodate the stator part.

[0021] Furthermore, the rotor part is arranged between the outer edge of the skeleton and the protective cover, and the rotor part is fixedly connected to the protective cover. The rotor part and the skeleton are loosely matched and are arranged opposite to each other in the radial direction.

[0022] Furthermore, a boss is provided on a side of the first shell facing the stator part, and the stator core is interference-fitted on the boss.

[0023] Furthermore, one end of the stator iron block is provided with at least one protrusion and the other end is provided with at least one groove, and different stator iron blocks are sequentially connected through interference fit between the protrusions and the grooves.

[0024] Furthermore, among the two adjacent stator iron blocks, one of the stator iron blocks is provided with at least one protrusion at both ends, and the other of the stator iron blocks is provided with at least one groove at both ends, and the different stator iron blocks are connected in sequence through the interference fit of the protrusions and grooves.

[0025] Furthermore, in the two connected stator iron blocks, both ends of each stator iron block are provided with the protrusion and the groove, and different stator iron blocks are sequentially connected through the interference fit of the protrusion and the groove.

[0026] Furthermore, the end fitting surfaces of two adjacent stator iron blocks pass through the center of the stator part along a line in the radial direction.

[0027] Furthermore, the end fitting surfaces of two adjacent stator iron blocks bisect the corresponding first slot body along a line in the radial direction.

[0028] Furthermore, the cross section of the protrusion in the radial direction is arcuate, and the central angle corresponding to the arcuate is 60-300°.

[0029] Furthermore, the cross section of the protrusion in the radial direction is of a special shape, wherein the surface of the protrusion facing outward is wavy or sawtooth-shaped.

[0030] Furthermore, the ratio of the radial extension length of the protrusion to the width of the stator iron block is 0.45-0.55.

[0031] Furthermore, the butt joint includes a first butt joint portion and a second butt joint portion, the butt joint of the protrusion and the groove forms the first butt joint portion, and the other end portion of the stator iron block forms the second butt joint portion, and the difference in initial size between the first butt joint portion and the second butt joint portion is 0.1-0.15 mm.

[0032] Furthermore, the stator iron block is in an arc shape, and the stator iron core formed by buckling and connecting at least two stator iron blocks is in a ring shape.

[0033] An elevator door comprises the above-mentioned motor and a door unit drivingly connected to the motor, wherein the motor can drive the door unit to open or close.

[0034] An elevator door comprises the above-mentioned motor.

[0035] Compared with the prior art, the advantages of the present invention are:

[0036] 1. The stator core is formed by at least two stator iron blocks that are sequentially buckled and connected. Compared with the integrated closed ring structure, the stator core of the present application adopts a buckled structure. Although there is an additional docking process and the installation error is slightly increased, it can be guaranteed to be within the allowable range. Compared with the processing method in the existing technology, the present application can significantly reduce the generation of waste and reduce costs by 30%.

[0037] 2. The stator core is formed by sequentially fastening and connecting at least two stator iron blocks. A butt joint is formed at the connection between the different stator iron blocks. This butt joint compensates for the stator core's tendency to tilt during the interference fit with the first housing, thereby ensuring the stator core's concentricity relative to the drive shaft axis. When concentricity is achieved, the magnetic circuits of the stator and rotor components are free of radial or axial gap unevenness, thereby ensuring reduced torque. This reduces motor vibration, thereby reducing vibration noise and enabling smoother operation. Furthermore, the magnetic circuit is more uniform, reducing motor losses and improving motor efficiency.

[0038] 3. Multiple slots for installing the frame are formed on the outer wall of the stator iron block. The buckling point of different stator iron blocks also forms a slot. The interference fit between the stator core and the frame is used to limit the installation and further increase the overall stability of the stator core. On the other hand, the buckling point of different stator iron blocks can serve as an identification for the frame, which is convenient for subsequent lead-in, wire management and other processes.

[0039] 4. The ratio of the sum of the arc lengths L of several outer notches to the outer circumference C of the stator core is 0.6-0.65, and the ratio of the depth h of the slot body to the difference between the maximum outer diameter D and the minimum outer diameter d of the stator core is 0.45-0.6. This can ensure that when the skeleton is stamped and installed with the stator core, the forces on each part are relatively uniform and not easily deformed. Moreover, the overall stability after installation is good, thereby effectively ensuring the stability of the motor performance.

[0040] 5. The trough includes an outer notch, which is in the shape of a regular figure eight and can limit the inward movement of the frame. A pair of semicircular limiting blocks are protruded from the inner sidewall of the trough, and the limiting blocks form an inverted figure eight in the direction X. The limiting blocks cooperate with the outer notch to jointly limit the frame. The combination of the outer notch of the trough and the regular figure eight and inverted figure eight structures of the limiting blocks achieves a dual combination of limiting, which better limits the frame and can still ensure the accuracy of the position in a vibrating environment. In addition, it can also avoid stress concentration, basically no wear and tear on the frame connection, and a more optimized structure.

[0041] 6. A protective cavity is provided on the side of the first housing facing the stator, and the protective cover is partially accommodated in the protective cavity. During maintenance, transportation, etc., after the second housing is removed, the first housing can protect the protective cover and prevent damage to the protective cover due to collisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic structural diagram of a motor according to an embodiment of the present invention;

[0043] Figure 2 is a schematic diagram of a partial structure of a motor;

[0044] FIG3 is a cross-sectional view of the motor;

[0045] FIG4 is a schematic structural diagram of the stator portion;

[0046] FIG5 is a schematic structural diagram of a stator core;

[0047] FIG6 is an enlarged view of portion A in FIG5 ;

[0048] Figure 7 is a schematic structural diagram of the stator iron block;

[0049] FIG8 is a schematic diagram of a partial structure of a motor.

[0050] 1. Outer shell; 10. First shell; 100. Protective cavity; 101. Boss; 11. Second shell; 12. Installation space; 2. Stator part; 20. Stator core; 200. Stator iron block; 201. First slot; 207. First clamping block; 204. Protrusion; 205. Groove; 202. Outer notch; 203. Limiting block; 206. Butt joint; 21. Skeleton; 210. Second clamping block; 211. Second slot; 22. Stator winding; 3. Rotor part; 30. Rotor yoke; 31. Magnetic part; 4. Protective cover; 5. Drive shaft; 6. Bearing; 7. Pulley. DETAILED DESCRIPTION

[0051] The following is a further non-restrictive detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model.

[0052] As shown in Figures 1 to 3, an electric motor according to an embodiment of the present invention includes a housing 1, a stator part 2, a rotor part 3, a protective cover 4, a transmission shaft 5, a bearing 6 and a pulley 7, wherein the stator part 2, the rotor part 3 and the protective cover 4 are all arranged in the housing 1, the stator part 2 is interference fit with the inside of the housing 1, the rotor part 3 is sleeved on the periphery of the stator part 2, the stator part 2 and the rotor part 3 are coaxially distributed, and the stator part 2 after energization has a magnetic field that can drive the rotor part 3 to rotate, so as to realize the conversion of electrical energy through the stator part 2 into mechanical energy for rotation of the rotor part 3, one side of the rotor part 3 is clearance fit with the stator part 2, and the other side is fixedly connected to the protective cover 4, the protective cover 4 is fixedly connected to the transmission shaft 5 by screws and can accommodate the stator part 2, the part of the transmission shaft 5 located inside the housing 1 is rotatably connected to the housing 1 through the bearing 6, and the pulley 7 is fixedly sleeved on the transmission shaft 5 and can realize synchronous rotation with the transmission shaft 5. During operation, the rotor part 3 rotates, and the protective cover 4 transmits the rotational power of the rotor part 3 to the transmission shaft 5, so that the transmission shaft 5 rotates relative to the shell 1. A pulley 7 is provided at the output end of the transmission shaft 5, and the opening and closing of the elevator door panel is realized by the pulley 7.

[0053] As shown in FIG8 , the rotor portion 3 includes a rotor yoke 30 and a plurality of magnetic members 31 . The plurality of magnetic members 31 are evenly distributed on the rotor yoke 31 along the circumferential direction around the transmission shaft 5 of the motor and are arranged toward the skeleton 21 .

[0054] The housing 1 includes a first shell 10 and a second shell 11, which are fixedly connected. A mounting space 12 for accommodating the stator 2, rotor 3, and protective cover 4 is formed between the first and second shells 10, 11. The transmission shaft 5 is rotationally connected to the first shell 10 and to the second shell 11 via bearings 6. It is worth noting that both the first and second shells 10, 11 are capable of accommodating the stator.

[0055] A protection cavity 100 is provided on one side of the first housing 10 facing the stator portion 2, and the protection cover 4 is partially accommodated in the protection cavity 100. In the above arrangement, the exposed portion of the protection cover 4 can also be easily taken by the operator.

[0056] With particular reference to FIG3 , a boss 101 is further provided on the side of the first housing 10 facing the stator portion 2, and the stator core 20 is interference-fitted on the boss 101. The main purpose is to complete the installation of the stator portion 2. Specifically, the boss 101 is coaxially arranged with the motor axis, and the stator portion 2 is sleeved on the boss 101 along the axial direction until it abuts against the positioning surface of the boss 101 and is installed in place. It is also worth noting that the boss 101 corresponding to the stator portion 2 is integrated into the first housing 10, and the bearing chamber of one of the bearings 6 is also integrated into the first housing 10, which can reduce processing errors and thereby ensure the concentricity between the stator portion 2 and the transmission shaft 5.

[0057] As shown in Figure 4, the stator portion 2 comprises a stator core 20, stator windings 22, and a frame 21, which are connected to each other. Each frame 21 is wound with a stator winding 22 along the axial direction. The rotor portion 3 is disposed between the outer edge of the frame 21 and the protective cover 4. The rotor portion 3 and the protective cover 4 are fixedly connected. The rotor portion 3 and the frame 21 are arranged opposite each other in the radial direction and have a clearance fit.

[0058] As shown in Figures 5-7, the stator core 20 is formed by at least two stator iron blocks 200 that are sequentially fastened together, and a butt joint 206 is formed at the fastening point where the at least two stator iron blocks 200 transitionally fit. The butt joint 206 is squeezed during the interference fit between the stator core 20 and the motor's drive shaft 5, and the butt joint 206 tends to shrink during the interference fit between the stator core 20 and the motor's drive shaft 5. After the stator core 20 and the motor's drive shaft 5 are installed, the fastening point between two adjacent stator iron blocks 200 is converted from a transition fit to an interference fit to compensate for the axial tilt of the stator core 20, thereby making the gap between the stator portion 2 and the rotor portion 3 uniform. At the same time, when the stator core 20 is mated with the frame 21, the butt joint 206 can serve as a marker to facilitate subsequent wire routing and wiring procedures. Among them, the number of stator iron blocks 200 is at least two, and can be divided arbitrarily as needed. There is no specific limit on the number. The number of stator iron blocks 200 is preferably 2-3. In this embodiment, the stator core 20 is formed by fastening two semicircular stator iron blocks 200 of the same shape.

[0059] During the above-mentioned assembly process, the two stator cores 20 are first fastened together under the action of an external force, and the inner side walls of the two stator cores 20 form a closed circular mounting cavity. After the stator portion 2 is formed by installing the skeleton and stator winding, the stator portion 2 is interference-fitted onto the boss 101. Due to the interference fit, during the axial pressure application process, it is easy to cause the stator portion 2 to tilt slightly in the axial direction relative to the boss 101, which not only causes the gap between the stator portion 2 and the rotor portion 3 to be uneven, but also causes the facing area between the stator portion 2 and the rotor portion 3 to be reduced. The above-mentioned arrangement of the present application can better solve the above-mentioned problems. Specifically, the two stator cores 200 form a butt joint 206 after being fastened together. During the interference fit between the stator portion 3 and the boss 101, the butt joint 206 can be compressed to provide compensation until the two stator cores 200 are interference-fitted, thereby ensuring coaxiality among the stator portion 2, the rotor portion 3, the boss 101, and the transmission shaft 5. With this high coaxiality, torque loss can be reduced during motor operation, motor vibration can be minimized, and operation can be smoothed while also reducing noise.

[0060] In the present invention, the size of the butt joint 206 formed by the transition fit between two adjacent stator iron blocks 200 is 0.45-0.55 mm. The difference between the outer diameter of the drive shaft 5 and the inner diameter of the stator core 20 is 0.6-0.8 mm. The butt joint 206 is used to radially compensate for the tendency of the stator core 20 to tilt relative to the drive shaft 5 in the axial direction after being compressed. By making the interference fit between the drive shaft 5 and the stator core 20 slightly larger than the butt joint 206, an interference fit is ensured between the two stator iron blocks 200 after installation, and the stator core 20 and the drive shaft 5 are also interference fit. This compensation is achieved while also facilitating the installation of the drive shaft 5, simplifying the installation process.

[0061] At least two stator iron blocks 200 have the following different connection methods. In the first embodiment of the present invention, one end of the stator iron block 200 is provided with at least one protrusion 204 and the other end is provided with at least one groove 205. Different stator iron blocks 200 are sequentially connected through the interference fit between the protrusion 204 and the groove 205. In the second embodiment of the present invention, two adjacent stator iron blocks 200 are provided with at least one protrusion 204 at both ends of one stator iron block 200, and at least one groove 205 at both ends of the other stator iron block 200. Different stator iron blocks 200 are sequentially connected through the interference fit between the protrusion 204 and the groove 205. In the third embodiment of the present invention, two adjacent stator iron blocks 200 are provided with both ends of each stator iron block 200. Different stator iron blocks 200 are sequentially connected through the interference fit between the protrusion 204 and the groove 205. Different docking methods can be selected according to the size requirements and the number of stator iron blocks 200. The main purpose is to ensure that after multiple stator iron blocks 200 are connected in sequence, the preset docking seam 206 is maintained and the structure itself has good stability.

[0062] In this embodiment, the butt joint 206 includes a first butt joint portion and a second butt joint portion. The butt joint between the protrusion 204 and the groove 205 forms the first butt joint portion, and the other end portion of the stator iron block 200 forms the second butt joint portion. The difference in initial size between the first butt joint portion and the second butt joint portion is 0.1-0.15 mm.

[0063] The cross section of the protrusion 204 in the radial direction is bow-shaped (less than 180° is a minor arc bow, and greater than or equal to 180° is a major arc bow), and the central angle corresponding to the bow is 60-300°. It is preferably 180 degrees, and its force-bearing area is a semicircle, with the farthest distance being the radius. Compared with the minor arc bow, the contact area size is selected to be larger to ensure the stability of the two stator iron blocks 200 after installation. Secondly, compared with the major arc bow, its force is a semicircle, and the overall force is divergent outward, and the stress at the starting part of the major arc is more concentrated. When the arc angle is selected to be too large, it is easy to cause deformation, cracking and other phenomena, affecting the stability of the motor operation, and there is an implicit risk of internal cracking. It is worth noting that the cross section of the protrusion 204 in the radial direction can also be of an irregular shape, wherein the surface of the protrusion 204 facing the outside is wavy or serrated or other irregular shapes.

[0064] The ratio of the radial extension length of the protrusion 204 to the width of the stator iron block 200 is 0.45-0.55.

[0065] In this embodiment, the end-jointing surfaces of two adjacent stator iron blocks 200 radially pass through the center of the stator portion 2. Simultaneously, the end-jointing surfaces of two adjacent stator iron blocks 200 radially bisect the corresponding first slot body 201. The end faces of the stator iron blocks 200 are positioned at corresponding locations within the first slot body 201, and in the middle of the corresponding first slot body 201. The first slot body 201 and the skeleton 21 are joined by axially pressing the multiple skeletons 21 into the first slot body 201, with an interference fit therebetween. This exerts a multi-directionally dispersed pressing force on the sidewalls of the first slot body 201. By designing the positions of the end-jointing surfaces of the stator iron blocks, the circumferential uniformity of the pressing force is ensured, thereby preventing the skeleton 21 from tilting.

[0066] The stator iron block 200 is arc-shaped, and the stator core 20 formed by buckling and connecting at least two stator iron blocks 200 is annular.

[0067] At least one first slot 201 and / or a first clamping block 207 is provided on the outer wall of the stator core 20, and a second clamping block 210 corresponding one-to-one to the first slot 201 and / or a second slot 211 corresponding one-to-one to the first clamping block 207 is protruded on the inner wall of the skeleton 21. The first clamping block 207 and the second clamping block 210 are respectively accommodated in the second slot 211 and the first slot 201 with interference fit.

[0068] As shown in Figure 6, the first slot body 201 or the second slot body 211 includes an outer notch 202. The outer notch 202 converges toward its opening along an axis of symmetry passing through the center of the stator core 20, thereby guiding the inward convergence of the stator core 20 and the frame 21. Specifically, the opening of the outer notch 202 is formed at the outer edge of the first slot body 201 or the second slot body 211. The outer notch 202 is in a regular "V" shape based on its opening and is capable of abutting against the sidewall of the frame 21, thereby limiting the inward convergence of the frame 21.

[0069] As shown in FIG6 , the motor further includes at least one pair of symmetrically arranged stoppers 203. The stoppers 203 are disposed on the inner sidewalls of the first slot body 201 or the second slot body 211, or on the outer sidewalls of the frame 21. A line connecting the two opposite end points of the stoppers 203 extends toward the opening thereof along an axis of symmetry passing through the center of the stator core 20, thereby providing abutment and position limiting contact between the inner structure of the stator core 20 and the frame 21 after mating. The stoppers 203 are arched in a cross-section perpendicular to the axial direction of the motor, with the corresponding circular angle of the arch being 160-240°.

[0070] Specifically, the limit blocks 203 are semicircular, and the diameter direction X of a pair of limit blocks 203 is an inverted figure eight shape based on the opening thereof, so as to abut and limit the inner structure of the stator core 20 and the skeleton 21 after they are connected. The limit blocks 203 can also be of other shapes as long as they can satisfy the function of outward limiting the skeleton 21. Through the above-mentioned structure of the positive figure eight shape and the inverted figure eight shape, the skeleton 21 can play a dual limiting role, and the force points can be distributed in different directions during the installation process, thereby avoiding the occurrence of stress concentration phenomena on the skeleton 21 during the installation process and the subsequent operation of the motor, and the structure is more optimized.

[0071] As shown in Figure 5, the ratio of the sum of the arc lengths L of the plurality of outer notches 202 to the outer circumference C of the stator core 20 is 0.6-0.65, so that the minimum distance between two adjacent stator windings 22 wound on the skeleton 21 is not less than 2.5mm. The ratio of the depth h of the slot body 201 to the difference between the maximum outer diameter D and the minimum outer diameter d of the stator core 20 is 0.45-0.6, which can ensure that when the skeleton 21 is stamped and installed with the stator core 20, the forces on each part are relatively uniform and not easily deformed, and the overall stability after installation is good, thereby effectively ensuring the stability of the motor performance. In addition, the above-mentioned ratio setting relationship can ensure that the stator winding 22 can be effectively wound on the skeleton 21, and the minimum distance between two adjacent stator windings is not less than 2.5mm. For example, 2.5mm, 2.8mm, and 3.0mm can be selected.

[0072] In this embodiment, the arc length L of the outer notch 202 is 6.6 mm, the arc length L1 of the inner notch is 5 mm, the maximum outer diameter D of the stator core 20 is 30.5 mm, and the minimum outer diameter d of the stator core 20 is 20 mm.

[0073] The utility model also discloses an elevator door, comprising a motor and a door unit transmission-connected to the motor, wherein the motor can drive the door unit to open or close.

[0074] Beneficial effects of the utility model:

[0075] 1. The stator core 20 is formed by at least two stator iron blocks 200 that are sequentially fastened together. Compared to an integrated closed ring structure, the stator core 20 of the present application adopts a fastening structure. Although there is an additional docking process and the installation error is slightly increased, it can be guaranteed to be within the allowable range. Compared with the processing method in the prior art, the present application can significantly reduce the generation of waste and reduce costs by 30%.

[0076] 2. After the stator core 20 is formed by sequentially fastening and connecting at least two stator iron blocks 200, a butt joint 206 is formed at the connection between different stator iron blocks 200. This butt joint 206 can compensate for the tilting tendency of the stator core 20 during the interference fit with the first housing 10, thereby ensuring the concentricity of the stator core 20 relative to the axis of the transmission shaft 5. When concentricity is met, the magnetic circuits of the stator portion 2 and the rotor portion 3 will not have uneven radial or axial gaps, thereby ensuring reduced torque, thereby reducing motor vibration and noise, and achieving smoother operation. In addition, the magnetic circuit is more uniform, reducing motor losses and improving motor efficiency.

[0077] 3. A plurality of slots 201 for mounting the frame 21 are formed on the outer wall of the stator iron block 200. The fastening points of different stator iron blocks 200 also form a slot 201. The interference fit between the stator core 20 and the frame 21 is utilized to further enhance the overall stability of the stator core 20. On the other hand, the fastening points of different stator iron blocks 200 can serve as an identification for the frame 21, facilitating subsequent wiring, wire management, and other processes.

[0078] 4. The ratio of the sum of the arc lengths L of the plurality of outer notches 202 to the outer circumference C of the stator core 20 is 0.6-0.65, and the ratio of the depth h of the slot body 201 to the difference between the maximum outer diameter D and the minimum outer diameter d of the stator core 20 is 0.45-0.6. This ensures that when the skeleton 21 is stamped and installed with the stator core 20, the forces on each part are relatively uniform and not easily deformed, and the overall stability after installation is good, thereby effectively ensuring the stability of the motor performance.

[0079] 5. The trough 201 includes an outer notch 202, which is in the shape of a regular figure eight and can limit the inward movement of the frame 21. A pair of limiting blocks 203 are protruded from the inner sidewall of the trough 201. The limiting blocks 203 are semicircular, and the diameters of the limiting blocks 203 form an inverted figure eight in the direction X. The limiting blocks 203 cooperate with the outer notch 202 to jointly limit the frame 21. The combination of the regular figure eight and inverted figure eight structures of the outer notch 202 of the trough 201 and the limiting blocks 203 achieves a dual combination of limiting, which better limits the position of the frame 21 and can still ensure the accuracy of the position in a vibrating environment. In addition, it can also avoid stress concentration, basically preventing wear at the connection of the frame 21, and further optimizing the structure.

[0080] 6. A protective cavity 100 is provided on the side of the first housing 10 facing the stator portion 2, and the protective cover 4 is partially accommodated within the protective cavity 100. During maintenance and transportation, after the second housing 11 is removed, the first housing 10 can protect the protective cover 4 and prevent damage to the protective cover 4 due to collisions.

[0081] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A motor, comprising a housing (1) and a stator part (2) and a rotor part (3) arranged in the housing (1), wherein the stator part (2) comprises a stator core (20) and a frame (21) matched with each other, characterized in that: The outer wall of the stator core (20) is provided with at least one first slot body (201) and / or a first clamping block (207); the inner wall of the frame (21) is provided with a second clamping block (210) corresponding one-to-one to the first slot body (201) and / or a second slot body (211) corresponding one-to-one to the first clamping block (207); the first clamping block (207) and the second clamping block (210) are respectively accommodated in the second slot body (211) and the first slot body (201) in an interference fit; The first slot body (201) or the second slot body (211) both include an outer notch (202), and the outer notch (202) has a tendency to converge toward its opening along a symmetry axis passing through the center of the stator core (20) so as to guide the matching action of the stator core (20) and the frame (21) to converge inwards; The motor further comprises at least one pair of symmetrically arranged limit blocks (203), wherein the limit blocks (203) are arranged on the inner side wall forming the first slot body (201) or the second slot body (211), or on the outer side wall of the frame (21), and the line connecting the two opposite end points of the limit blocks (203) tends to expand toward the opening thereof along the symmetry axis passing through the center of the stator core (20), so as to abut and limit the inner side structure of the stator core (20) and the frame (21) after being matched.

2. The motor according to claim 1, characterized in that The outer notch (202) is in a right "X" shape with its opening as a reference, and the opening of the outer notch (202) is formed at the outer edge of the first slot body (201) or the second slot body (211).

3. The motor according to claim 1, characterized in that The limiting block (203) is in an arcuate shape in an axial section perpendicular to the motor, and the circular angle corresponding to the arcuate shape is 160-240°.

4. The motor according to claim 3, characterized in that The limiting blocks (203) are semicircular in shape, and the diameter direction (X) of a pair of limiting blocks (203) forms an inverted eight-shaped shape with their openings as a reference, so as to abut and limit the inner structure of the stator core (20) and the frame (21) after they are matched.

5. The motor according to claim 1, characterized in that The stator core (20) is formed by at least two stator iron blocks (200) being connected in sequence by buckling, and a butt joint (206) is formed at the buckling position of the transitional fitting of at least two stator iron blocks (200). The butt joint (206) is squeezed during the interference fitting process between the stator core (20) and the transmission shaft (5) of the motor to compensate for the axial tilting tendency of the stator core (20), so that the gap between the stator part (2) and the rotor part (3) is uniform.

6. The motor according to claim 1, characterized in that When the stator core (20) and the frame (21) are mated, the joint (206) can serve as a marker to facilitate subsequent wire lead-in and wire management processes.

7. The motor according to claim 1, characterized in that The ratio of the sum of the arc lengths (L) of the plurality of outer notches (202) to the outer circumference (C) of the stator core (20) is 0.6-0.65, so that the minimum distance between two adjacent stator windings (22) wound on the frame (21) is not less than 2.5 mm.

8. The motor according to claim 4, characterized in that The ratio of the depth (h) of the first slot body (201) or the second slot body (211) to the difference between the maximum outer diameter (D) and the minimum outer diameter (d) of the stator core (20) is 0.45-0.

6.

9. The motor according to claim 1, characterized in that The housing (1) comprises a first shell (10) and a second shell (11); the first shell (10) and the second shell (11) are fixedly connected and both are capable of accommodating the stator part (2). Preferably, a protection cavity (100) is provided on a side of the first shell (10) facing the stator part (2), and a protection cover (4) of the motor is partially accommodated in the protection cavity (100). Preferably, the motor further comprises a transmission shaft (5), the transmission shaft (5) and the first housing (10) as well as the transmission shaft (5) and the second housing (11) are rotatably connected via bearings (6), and the protective cover (4) is fixedly connected to the transmission shaft (5) and is capable of accommodating the stator part (2). Preferably, the rotor part (3) is arranged between the outer edge of the skeleton (21) and the protective cover (4), and the rotor part (3) and the protective cover (4) are fixedly connected, and the rotor part (3) and the skeleton (21) are clearance-matched and are arranged opposite to each other in the radial direction. Preferably, a boss (101) is further provided on a side of the first shell (10) facing the stator part (2), and the stator core (20) is interference-fitted on the boss (101). Preferably, at least one protrusion (204) is provided at one end of the stator iron block (200), and at least one groove (205) is provided at the other end, and different stator iron blocks (200) are connected in sequence through interference fit between the protrusions (204) and the grooves (205). Preferably, among two adjacent stator iron blocks (200), at both ends of one of the stator iron blocks (200) are provided with at least one protrusion (204), and at both ends of the other stator iron block (200) are provided with at least one groove (205), and different stator iron blocks (200) are sequentially connected through interference fit between the protrusions (204) and the grooves (205). Preferably, in the two connected stator iron blocks (200), both ends of each stator iron block (200) are provided with the protrusion (204) and the groove (205), and different stator iron blocks (200) are connected in sequence through the interference fit of the protrusion (204) and the groove (205). Preferably, the end fitting surfaces of two adjacent stator iron blocks (200) pass through the center of the stator part (2) along a line in the radial direction. Preferably, the end fitting surfaces of two adjacent stator iron blocks (200) bisect the corresponding first slot body (201) along a line in the radial direction. Preferably, the protrusion (204) has an arcuate cross-section in the radial direction, and the central angle corresponding to the arcuate is 60-300°. Preferably, the cross-section of the protrusion (204) in the radial direction is of an irregular shape, wherein the surface of the protrusion (204) facing outward is wavy or sawtooth-shaped. Preferably, the extension length of the protrusion (204) in the radial direction is proportional to the width of the stator iron block (200). The value is 0.45-0.

55. Preferably, the butt joint (206) includes a first butt joint portion and a second butt joint portion, the butt joint of the protrusion (204) and the groove (205) forms the first butt joint portion, the other end portion of the stator iron block (200) forms the second butt joint portion, and the difference in initial size between the first butt joint portion and the second butt joint portion is 0.1-0.15 mm. Preferably, the stator iron block (200) is in an arc shape, and the stator iron core (20) formed by buckling and connecting at least two stator iron blocks (200) is in a circular ring shape.

10. An elevator door, characterized in that: It comprises a motor as described in any one of claims 1 to 9 and a door unit drivingly connected to the motor, wherein the motor can drive the door unit to open or close.

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