Elevator door

Abstract

The elevator door comprises a motor and a door unit in transmission connection with the motor, the motor comprises a shell, a stator part and a rotor part, the stator part and the rotor part are arranged in the shell, the stator part comprises a stator iron core, stator windings and frameworks, the stator iron core, the stator windings and the frameworks are connected in a matched mode, and each framework is wound with the corresponding stator winding in the axis direction. The stator iron core is formed by buckling and connecting at least two stator iron blocks in sequence, a butt joint seam is formed at the buckling position of transition fit of the at least two stator iron blocks, and the butt joint seam is extruded in the interference fit process of the stator iron core and a transmission shaft of the motor. And the buckling position of two adjacent stator iron blocks is converted from transition fit connection to interference fit connection after the stator iron core and the transmission shaft of the motor are installed in place, so that the inclination trend of the stator iron core in the axial direction is compensated, and the gap between the stator part and the rotor part is uniform. According to the invention, material parts can be greatly saved, the production cost is reduced, and the gap uniformity between the stator and the rotor is ensured at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and in particular to an elevator door. Background Art

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

[0003] One of the problems is that there will be a lot of waste during the manufacturing process, which results in a high manufacturing cost. The main reason is that the stator core of the elevator door opening motor is a hollow ring, which is usually processed by wire cutting technology to ensure that the core is a fully enclosed integrated structure. Although this can ensure sufficient accuracy, it causes a lot of waste.

[0004] The second problem is that in the prior art, the stator core gap is sleeved on the middle raised part of the housing, and then axially locked by screws. (1) It is easy to cause the center line of the stator to be misaligned with the axis in the radial direction, which causes the gap uniformity between the stator end and the rotor to be uneven; (2) It is easy to cause the stator to tilt slightly in the axial direction, which not only causes the area between the stator end and the rotor to be reduced, but also causes the gap width in the axial direction to be inconsistent (narrow at the top and wide at the bottom, etc.), and the gap uniformity is not high. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an elevator door that can significantly save materials and reduce production costs while meeting installation accuracy, while ensuring uniformity of the gap between the stator and the rotor.

[0006] The present invention is achieved through the following technical solutions:

[0007] An elevator door, comprising a motor and a door unit drivingly connected to the motor, the motor being capable of driving the door unit to open or close, the motor including a housing and a stator part and a rotor part arranged in the housing, the stator part and the rotor part being coaxially distributed, the energized stator part having a magnetic field capable of driving the rotor part to rotate, so as to realize the conversion of electrical energy of the stator part into mechanical energy of the rotation of the rotor part, the stator part including a stator iron core, a stator winding and a skeleton which are mutually mated, each skeleton being wound with the stator winding along the axial direction, the rotor part including a rotor yoke part and a plurality of magnetic members, the plurality of magnetic members being circumferentially and uniformly arranged on the rotor yoke part around the transmission shaft of the motor and facing the skeleton, the stator iron core being formed by sequentially fastening at least two stator iron blocks, and a butt joint seam being formed at the fastening place of the transition mating of at least two stator iron blocks, during the interference fit of the stator iron core and the transmission shaft of the motor, the butt joint seam is extruded, and the fastening place of adjacent two stator iron blocks is converted from transition mating to interference mating after the stator iron core and the transmission shaft of the motor are installed in place, so as to compensate for the inclination tendency of the stator iron core in the axial direction, and make the gap between the stator part and the rotor part uniform.

[0008] Further, the size of the butt joint seam formed by the transition fit between adjacent two stator iron blocks is 0.45-0.55 mm, and the difference between the outer diameter of the transmission shaft and the inner diameter of the stator iron core is 0.6-0.8 mm.

[0009] Further, the butt joint seam is used to compensate for the inclination tendency of the stator iron core relative to the transmission shaft in the axial direction after being pressed in the radial direction.

[0010] Further, at least one first groove and / or first clamping block is / are arranged on the outer wall of the stator iron core, and a second clamping block corresponding to the first groove one by one and / or a second groove corresponding to the first clamping block one by one is / are protruded on the inner wall of the skeleton, and the first clamping block and the second clamping block are respectively received in the second groove and the first groove by interference fit.

[0011] Further, the first groove or the second groove both includes an outer notch, and the outer notch trends to converge towards its opening along the symmetry axis passing through the center of the stator iron core, so as to conduct an inward convergence guiding on the mating action of the stator iron core and the skeleton.

[0012] Further, the motor further includes at least a pair of limiting blocks symmetrically arranged, the limiting blocks are arranged on the inner side wall forming the first groove or the second groove, or arranged on the outer side wall of the skeleton, and the connection line of the opposite two end points of the limiting block trends to expand towards its opening along the symmetry axis passing through the center of the stator iron core, so as to conduct abutting limit on the inner side structure after the stator iron core and the skeleton are mated.

[0013] Further, the outer notch is in a positive eight - character shape with its opening as the reference, and the opening of the outer notch is formed at the outer edge of the first groove body or the second groove body.

[0014] Further, the limiting block is in a bow shape in the axial cross - section perpendicular to the axis of the motor, and the circular angle corresponding to the bow shape is 160 - 240°.

[0015] Further, the limiting block is in a semi - circular shape, and the directions of the diameters of a pair of the limiting blocks form an inverted eight - character shape with its opening as the reference to perform abutting and limiting on the inner structure after the stator core and the skeleton are mated.

[0016] Further, when the stator core and the skeleton are mated, the docking seam can play a marking role to facilitate subsequent lead - wiring and wire - arranging processes.

[0017] Further, the ratio of the sum of the arc lengths of several outer notches to the outer circumference of the stator core is 0.6 - 0.65, so that the minimum distance between adjacent two stator windings wound on the skeleton is not less than 2.5 mm.

[0018] Further, the ratio of the depth of the first groove body or the second groove body to the difference between the maximum outer diameter and the minimum outer diameter of the stator core is 0.45 - 0.6.

[0019] Further, the housing includes a first housing body and a second housing body, the first housing body and the second housing body are fixedly connected, and both can accommodate the stator part.

[0020] Further, a protection cavity is provided on the side of the first housing body facing the stator part, and a part of the protective cover of the motor is accommodated in the protection cavity.

[0021] Further, the motor further includes a transmission shaft, the transmission shaft is rotatably connected to the first housing body and the second housing body through bearings respectively, and the protective cover is fixedly connected to the transmission shaft and can accommodate the stator part.

[0022] Further, the rotor part is arranged between the outer edge of the skeleton and the protective cover, the rotor part is fixedly connected to the protective cover, and the rotor part is in clearance fit with the skeleton and is oppositely arranged in the radial direction.

[0023] Further, a boss is also provided on the side of the first housing body facing the stator part, and the stator core is interference - fitted on the boss.

[0024] Further, at least one protrusion is provided at one end of the stator iron core block, and at least one groove is provided at the other end. Different stator iron core blocks are sequentially connected through interference fit between the protrusion and the groove.

[0025] Further, in two adjacent stator iron core blocks, at least one protrusion is provided at both ends of one of the stator iron core blocks, and at least one groove is provided at both ends of the other stator iron core block. Different stator iron core blocks are sequentially connected through interference fit between the protrusion and the groove.

[0026] Further, in two adjacent stator iron core blocks, protrusions and grooves are provided at both ends of each stator iron core block. Different stator iron core blocks are sequentially connected through interference fit between the protrusion and the groove.

[0027] Further, the radial line along the end joint surface of two adjacent stator iron core blocks passes through the center of the circle of the stator part.

[0028] Further, the radial line along the end joint surface of two adjacent stator iron core blocks bisects the corresponding first groove body.

[0029] Further, the cross-section of the protrusion in the radial direction is in a bow shape, and the central angle corresponding to the bow shape is 60 - 300°.

[0030] Further, the cross-section of the protrusion in the radial direction is in a special shape, and the surface of the protrusion facing the outside is in a wavy or serrated shape.

[0031] Further, the ratio of the extension length of the protrusion in the radial direction to the width of the stator iron core block is 0.45 - 0.55.

[0032] Further, the docking seam includes a first docking part and a second docking part. The docking part of the protrusion and the groove forms the first docking part, and the other parts of the end of the stator iron core block form the second docking part. The difference between the initial size of the first docking part and the second docking part is 0.1 - 0.15 mm.

[0033] Further, the stator iron core block is in an arc shape, and at least two stator iron core blocks are snap-connected to form a stator core in a circular ring shape.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] 1. The stator core is formed by sequentially snap - fitting at least two stator iron blocks. Compared with an integral closed - ring structure, the stator core of this application adopts a snap - fitting structure. Although there is one more docking process and the installation error slightly increases, it can be ensured within the allowable range. Compared with the processing methods in the prior art, this application can greatly reduce the generation of waste and reduce the cost by 30%.

[0036] 2. After the stator core is formed by sequentially snap - fitting at least two stator iron blocks, a docking seam is formed at the connection of different stator iron blocks. The docking seam can compensate for the inclination trend of the stator core during the interference fit with the first housing, thereby ensuring the concentricity of the stator core relative to the axis of the transmission shaft. When the concentricity is satisfied, the magnetic circuits of the stator part and the rotor part will not have uneven radial and axial gaps, which can further ensure that the torque is reduced. Therefore, the vibration of the motor can be reduced, the vibration noise can be reduced, and its operation is more stable. In addition, the magnetic circuit is more uniform, the motor loss is reduced, and the motor efficiency is improved.

[0037] 3. A plurality of grooves for installing the skeleton are formed on the outer wall of the stator iron block, and a groove is also formed at the snap - fit of different stator iron blocks. By using the interference fit and limit of the stator core and the skeleton, the overall stability of the stator core is further increased. On the other hand, the snap - fit of different stator iron blocks can play a role in marking the skeleton, which is convenient for subsequent processes such as wire leading and wire arranging.

[0038] 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 groove to the difference between the maximum outer diameter D and the minimum outer diameter d of the stator core is 0.45 - 0.6. When the skeleton is stamping - installed with the stator core, the force on each part is relatively uniform, it is not easy to deform, and the overall stability after installation is good, thus effectively ensuring the stability of the motor performance.

[0039] 5. The groove includes an outer notch. The outer notch is in a positive - eight - character shape and can have a function of inwardly converging and limiting the skeleton. A pair of limiting blocks are convexly provided on the inner side wall of the groove. The limiting blocks are semi - circular, and the direction X of the diameters of a pair of limiting blocks forms an inverted - eight - character shape. The pair of limiting blocks cooperate with the outer notch to jointly limit the skeleton. Through the structural cooperation of the outer notch and the limiting blocks in the positive - eight and inverted - eight shapes of the groove, double - combination limiting is realized, which is better for limiting the skeleton. The position accuracy can still be ensured in a vibrating environment. In addition, stress concentration can be avoided, and basically no wear will occur at the connection of the skeleton, and the structure is more optimized.

[0040] 6. A protection cavity is provided on the side of the first housing facing the stator part, and the protective cover is partially accommodated in the protection cavity. During processes such as maintenance and handling, after the second housing is removed, the first housing can play an important role in protecting the protective cover and avoiding damage to the protective cover caused by collision and the like. Description of the Drawings

[0041] Figure 1 Schematic structural diagram of a motor according to an embodiment of the present invention;

[0042] Figure 2 Partial structural diagram of the motor;

[0043] Figure 3 Cross-sectional view of the motor;

[0044] Figure 4 Schematic structural diagram of the stator part;

[0045] Figure 5 Schematic structural diagram of the stator core;

[0046] Figure 6 For Figure 5 Enlarged view of part A in;

[0047] Figure 7 Schematic structural diagram of the stator iron block;

[0048] Figure 8 Partial structural diagram of the motor.

[0049] 1. Housing; 10. First housing; 100. Protection cavity; 101. Boss; 11. Second housing; 12. Installation space; 2. Stator part; 20. Stator core; 200. Stator iron block; 201. First groove; 207. First clamping block; 204. Protrusion; 205. Groove; 202. Outer notch; 203. Limiting block; 206. Docking seam; 21. Skeleton; 210. Second clamping block; 211. Second groove; 22. Stator winding; 3. Rotor part; 30. Rotor yoke; 31. Magnetic part; 4. Protective cover; 5. Transmission shaft; 6. Bearing; 7. Belt pulley. Detailed Description of the Invention

[0050] The following is a further non-restrictive detailed description of the technical solution of the invention in conjunction with the preferred embodiments and the accompanying drawings. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, 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 present invention, and cannot be understood as limitations on the present invention.

[0051] like Figures 1 - 3 As shown, an elevator door according to an embodiment of the present invention comprises a motor and a door unit connected to the motor in a transmission manner, and the motor can drive the door unit to open or close. The motor comprises 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-fitted 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, the stator part 2 after being energized has a magnetic field that can drive the rotor part 3 to rotate, so as to realize the conversion of the electrical energy of the stator part 2 into the mechanical energy of the rotor part 3, the rotor part 3 is clearance-fitted with the stator part 2 on one side and fixedly connected with the protective cover 4 on the other side, the protective cover 4 is fixedly connected with 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 rotationally connected with 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.

[0052] like Figure 8 As shown, the rotor part 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 .

[0053] The housing 1 includes a first housing 10 and a second housing 11. The first housing 10 and the second housing 11 are fixedly connected, and an installation space 12 for accommodating the stator part 2, the rotor part 3, and the protective cover 4 is formed between the first housing 10 and the second housing 11. The transmission shaft 5 is rotatably connected to the first housing 10 and the second housing 11 through bearings 6. It should be noted that both the first housing 10 and the second housing 11 can accommodate the stator part.

[0054] A protection cavity 100 is provided on the side of the first housing 10 facing the stator part 2, and a part of the protective cover 4 is accommodated in the protection cavity 100. In the above setting method, the exposed part of the protective cover 4 is also convenient for the operator to take.

[0055] With particular reference to Figure 3 , a boss 101 is also provided on the side of the first housing 10 facing the stator part 2, and the stator core 20 is press-fitted on the boss 101. The main purpose is to complete the installation of the stator part 2. Specifically, the boss 101 is coaxially arranged with the motor axis, and the stator part 2 is sleeved on the boss 101 along the axial direction until it abuts against the positioning surface of the boss 101, and the installation is in place. It should also be noted that integrating the boss 101 corresponding to the installation of the stator part 2 on the first housing 10 and integrating the bearing chamber of one of the bearings 6 on the first housing 10 can reduce the machining error, and thus ensure the concentricity between the stator part 2 and the transmission shaft 5.

[0056] As Figure 4 shown, the stator part 2 includes a stator core 20, a stator winding 22, and a skeleton 21 that are mutually mated. Each skeleton 21 is wound with a stator winding 22 along the axial direction. The rotor part 3 is arranged between the outer edge of the skeleton 21 and the protective cover 4, and the rotor part 3 is fixedly connected to the protective cover 4. The rotor part 3 and the skeleton 21 are arranged opposite to each other in the radial direction and have a clearance fit.

[0057] As Figures 5 - 7As shown, the stator core 20 is formed by sequentially fastening at least two stator iron blocks 200, and a butt joint 206 is formed at the fastening part where at least two stator iron blocks 200 are in transitional fit. During the interference fit between the stator core 20 and the transmission shaft 5 of the motor, the butt joint 206 is extruded. The butt joint 206 shows a shrinking trend during the interference fit between the stator core 20 and the transmission shaft 5 of the motor. The fastening part between two adjacent stator iron blocks 200 is converted from transitional fit to interference fit after the stator core 20 and the transmission shaft 5 of the motor are installed in place, so as to compensate for the inclination trend of the stator core 20 in the axial direction and make the gap between the stator part 2 and the rotor part 3 uniform. At the same time, when the stator core 20 is mated with the skeleton 21, the butt joint 206 can play a marking role to facilitate subsequent lead wiring and wire arranging processes. Among them, the number of stator iron blocks 200 is at least two, and can be arbitrarily divided according to needs, and the number is not specifically limited. The number of stator iron blocks 200 is preferably 2-3. In this embodiment, the stator core 20 is formed by buckling two semi-circular stator iron blocks 200 with the same shape.

[0058] During the above assembly process, the two stator cores 20 are first fastened together under the action of an external force, and a closed circular installation cavity is formed on the inner side walls of the two stator cores 20. After forming the stator part 2 through processes such as installing the skeleton and stator windings, the stator part 2 is interference-fitted on the boss 101. Due to the interference fit, during the axial pressure application process, it is easy to cause the stator part 2 to have a slight inclination in the axial direction relative to the boss 101. This not only results in poor uniformity of the gap between the stator part 2 and the rotor part 3, but also reduces the facing area between the stator part 2 and the rotor part 3. Through the above settings of the present application, these problems can be better solved. Specifically, a butt joint 206 is formed after the two stator cores 20 are fastened. During the interference fit between the stator part 3 and the boss 101, the butt joint 206 can be pressed tightly to play a compensating role until the two stator iron blocks 200 are in interference fit, thereby ensuring the coaxiality among the stator part 2, the rotor part 3, the boss 101, and the transmission shaft 5. With high coaxiality ensured, during the operation of the motor, torque loss can be reduced, motor vibration can be minimized, and while it operates smoothly, noise can also be reduced.

[0059] In the present invention, the size of the butt joint 206 formed by the transitional fit between two adjacent stator iron blocks 200 is 0.45 - 0.55 mm, and the difference between the outer diameter of the transmission shaft 5 and the inner diameter of the stator core 20 is 0.6 - 0.8 mm. The butt joint 206 is used to compensate for the inclination trend of the stator core 20 relative to the transmission shaft 5 in the axial direction after being compressed in the radial direction. By making the interference amount between the transmission shaft 5 and the stator core 20 slightly larger than the butt joint 206, it can be ensured that there is an interference fit between the two stator iron blocks 200 after installation, and there is also an interference fit between the stator core 20 and the transmission shaft 5. While compensating, it is also convenient for the installation of the transmission shaft 5, and the installation process is simple.

[0060] At least two stator iron cores 200 have the following different connection methods. In the first embodiment of the present invention, at least one protrusion 204 is provided at one end of the stator iron core 200, and at least one groove 205 is provided at the other end. Different stator iron cores 200 are sequentially connected through the interference fit between the protrusion 204 and the groove 205. In the second embodiment of the present invention, among two adjacent stator iron cores 200, at least one protrusion 204 is provided at both ends of one stator iron core 200, and at least one groove 205 is provided at both ends of the other stator iron core 200. Different stator iron cores 200 are sequentially connected through the interference fit between the protrusion 204 and the groove 205. In the third embodiment of the present invention, among two connected stator iron cores 200, protrusions 204 and grooves 205 are provided at both ends of each stator iron core 200. Different stator iron cores 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 of the stator iron core 200, the required quantity, etc. The main purpose is to ensure that after multiple stator iron cores 200 are sequentially connected, a preset docking seam 206 is maintained, and it also has good structural stability itself.

[0061] In this embodiment, the docking seam 206 includes a first docking part and a second docking part. The docking part of the protrusion 204 and the groove 205 forms the first docking part, and the other parts of the end of the stator iron core 200 form the second docking part. The difference between the initial size of the first docking part and the second docking part is 0.1 - 0.15 mm.

[0062] The cross-section of the protrusion 204 in the radial direction is in the shape of an arc (less than 180° is a minor arc segment, greater than or equal to 180° is a major arc segment), and the central angle corresponding to the arc is 60 - 300°. Preferably, it is 180 degrees. The area for bearing force is a semi-circle, and the farthest distance is the radius. Compared with the minor arc segment, a larger contact area size is selected to ensure the stability after the installation of two stator iron cores 200. Secondly, compared with the major arc segment, the force is a semi-circle, and the overall force is divergent outward. The stress at the starting part of the major arc is more concentrated. When the arc angle is selected too large, it is easy to cause deformation, cracking and other phenomena, affecting the stable operation of the motor, and there is an implicit risk of internal cracking. It should be noted that the cross-section of the protrusion 204 in the radial direction can also be in a special shape, and the surface of the protrusion 204 facing the outside is in a wavy or serrated shape or other special shapes.

[0063] The ratio of the extension length of the protrusion 204 in the radial direction to the width of the stator iron core 200 is 0.45 - 0.55.

[0064] In this embodiment, the end joint surfaces of two adjacent stator iron blocks 200 pass through the center of the stator part 2 along the radial line, and at the same time, the end joint surfaces of two adjacent stator iron blocks 200 bisect the corresponding first groove 201 along the radial line. The end surfaces of the stator iron blocks 200 are arranged at the corresponding positions of the first groove 201 and in the middle of the corresponding first groove 201. When the first groove 201 is docked with the skeleton 21, a plurality of skeletons 21 are axially pressed into the first groove 201, and an interference fit is adopted between the two, so that a pressing force is applied to the side wall of the first groove 201. The pressing force is dispersed in multiple directions. Through the above position design of the end joint surfaces of the stator iron blocks, the uniformity of the pressing force in the circumferential direction can be ensured, thereby avoiding the occurrence of phenomena such as the inclination of the skeleton 21.

[0065] The stator iron block 200 is arc-shaped, and at least two stator iron blocks 200 are snap-connected to form a stator core 20 in a circular ring shape.

[0066] At least one first groove 201 and / or first clamping block 207 are formed on the outer wall of the stator core 20, and second clamping blocks 210 corresponding to the first grooves 201 one by one and / or second grooves 211 corresponding to the first clamping blocks 207 one by one are convexly provided on the inner wall of the skeleton 21. The first clamping block 207 and the second clamping block 210 are respectively received in the second groove 211 and the first groove 201 by interference fit.

[0067] As Figure 6 shown, both the first groove 201 and the second groove 211 include an outer notch 202. The outer notch 202 trends to converge towards its opening along the symmetry axis passing through the center of the stator core 20, so as to guide the mating action of the stator core 20 and the skeleton 21 inwards. Specifically, the opening of the outer notch 202 is formed at the outer edge of the first groove 201 or the second groove 211. The outer notch 202 is in a positive eight-shaped with its opening as the reference and can be attached to the side wall of the skeleton 21, so as to have an inward converging and limiting effect on the skeleton 21.

[0068] As Figure 6 shown, the motor further includes at least a pair of symmetrically arranged limiting blocks 203. The limiting blocks 203 are arranged on the inner side wall forming the first groove 201 or the second groove 211, or on the outer side wall of the skeleton 21. The connection line of the two opposite end points of the limiting block 203 trends to expand towards its opening along the symmetry axis passing through the center of the stator core 20, so as to perform abutting and limiting on the inner structure after the stator core 20 and the skeleton 21 are mated. The limiting block 203 is in a bow shape in the axial cross-section perpendicular to the motor, and the circular angle corresponding to the bow shape is 160 - 240°.

[0069] Specifically, the limiting block 203 is semi-circular, and the directions X where the diameters of a pair of limiting blocks 203 are located form an inverted V shape with the opening as the reference, so as to abut and limit the inner structure after the stator core 20 and the skeleton 21 are assembled. Among them, the limiting block 203 can also be of other shapes, as long as it can play a role in limiting the skeleton 21 outward. Through the above-mentioned structure of the combination of the positive V shape and the inverted V shape, the skeleton 21 can be double-limited, and the stress points can be distributed in different directions during the installation process, avoiding the occurrence of stress concentration phenomena such as during the installation process of the skeleton 21 and the subsequent operation of the motor, and the structure is more optimized.

[0070] As Figure 5 shown, the ratio of the sum of the arc lengths L of several 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 2.5 mm. The ratio of the depth h of the slot 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 stamping and installed with the stator core 20, the forces on each part are relatively uniform, not easy to deform, and the overall stability after installation is good, thus effectively ensuring the stability of the motor performance. In addition, the above ratio setting relationship can ensure that the stator windings 22 can be effectively wound on the skeleton 21, and the minimum distance between two adjacent stator windings is not less than 2.5 mm. For example, 2.5 mm, 2.8 mm, 3.0 mm can be selected.

[0071] 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.

[0072] The beneficial effects of the present invention:

[0073] 1. The stator core 20 is formed by sequentially buckling and connecting at least two stator iron blocks 200. Compared with the integral closed ring structure, the stator core 20 of the present application adopts a buckling structure. Although there is one more docking process and the installation error increases slightly, it can be ensured within the allowable range; compared with the processing methods in the prior art, the present application can greatly reduce the generation of waste and reduce the cost by 30%.

[0074] 2. After the stator core 20 is formed by sequentially snap-connecting at least two stator iron blocks 200, a butt joint seam 206 is formed at the connection of different stator iron blocks 200. The butt joint seam 206 can compensate for the inclination 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 the concentricity is satisfied, the magnetic circuit of the stator part 2 and the rotor part 3 will not have uneven radial and axial gaps, thereby ensuring that the torque is reduced. Therefore, the vibration of the motor can be reduced, and the vibration noise can be reduced, making its operation more stable. In addition, the magnetic circuit is more uniform, reducing the motor loss and improving the motor efficiency.

[0075] 3. A plurality of grooves 201 for installing the skeleton 21 are formed on the outer wall of the stator iron block 200, and a groove 201 is also formed at the snap joint of different stator iron blocks 200. By using the interference installation limit between the stator core 20 and the skeleton 21, the overall stability of the stator core 20 is further increased; on the other hand, the snap joint of different stator iron blocks 200 can play a role in marking the skeleton 21, facilitating subsequent processes such as wire leading and wire arranging.

[0076] 4. The ratio of the sum of the arc lengths L of several 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 groove 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. When the skeleton 21 is press-fitted and installed with the stator core 20, the force on each part is relatively uniform, not easily deformed, and the overall stability after installation is good, thereby effectively ensuring the stability of the motor performance.

[0077] 5. The groove 201 includes an outer notch 202. The outer notch 202 is in a positive eight-shaped configuration and can have a function of inwardly converging and limiting the skeleton 21. A pair of limiting blocks 203 are convexly provided on the inner side wall of the groove 201. The limiting blocks 203 are semicircular, and the direction X of the diameters of the pair of limiting blocks 203 forms an inverted eight-shaped configuration. The pair of limiting blocks 203 cooperate with the outer notch 202 to jointly limit the skeleton 21. Through the structural cooperation of the outer notch 202 and the limiting blocks 203 of the groove 201 in the positive eight and inverted eight configurations, double-combination limiting is realized, and the limiting of the skeleton 21 is better. The position accuracy can still be ensured in a vibration environment; in addition, stress concentration can also be avoided, and basically no wear will occur at the connection of the skeleton 21, and the structure is more optimized.

[0078] 6. A protection cavity 100 is provided on the side of the first housing 10 facing the stator part 2, and a part of the protective cover 4 is accommodated in the protection cavity 100. During processes such as maintenance and handling, after the second housing 11 is removed, the first housing 10 can play an important role in protecting the protective cover 4, avoiding damage to the protective cover 4 caused by collision, etc.

[0079] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. An elevator door, comprising a motor and a door unit drivingly connected to the motor, the motor being capable of driving the door unit to open or close, the motor comprising a housing (1) and a stator part (2) and a rotor part (3) arranged within the housing (1), the stator part (2) and the rotor part (3) being coaxially distributed, the energized stator part (2) having a magnetic field capable of driving the rotor part (3) to rotate, so as to convert the electrical energy of the stator part (2) into the mechanical energy of the rotation of the rotor part (3), the stator part (2) comprising a stator core (20), a stator winding (22) and a skeleton (21) which are mutually mated, each skeleton (21) being wound with the stator winding (22) along the axial direction, the rotor part (3) comprising a rotor yoke part (30) and a plurality of magnetic members (31), the plurality of magnetic members (31) being circumferentially and uniformly arranged on the rotor yoke part (31) around the transmission shaft (5) of the motor and facing the skeleton (21), characterized in that, The stator core (20) is formed by sequentially fastening and connecting at least two stator iron blocks (200), and a docking seam (206) is formed at the fastening portion where at least two of the stator iron blocks (200) are transitionally mated. During the interference fit between the stator core (20) and the transmission shaft (5) of the motor, the docking seam (206) is squeezed. After the stator core (20) and the transmission shaft (5) of the motor are installed in place, the fastening portion between two adjacent stator iron blocks (200) is converted from transitional mating to interference mating to compensate for the inclination tendency of the stator core (20) in the axial direction, so as to make the gap between the stator portion (2) and the rotor portion (3) uniform.

2. The elevator door according to claim 1, characterized in that, The size of the docking seam (206) formed by the transitional fit between two adjacent stator iron blocks (200) is 0.45 - 0.55 mm, and the difference between the outer diameter of the transmission shaft (5) and the inner diameter of the stator core (20) is 0.6 - 0.8 mm.

3. The elevator door according to claim 1, characterized in that, The docking seam (206) is used to compensate for the inclination tendency of the stator core (20) relative to the transmission shaft (5) in the axial direction after being compressed in the radial direction.

4. The elevator door according to claim 1, characterized in that, At least one first groove (201) and / or first block (207) are provided on the outer wall of the stator core (20), and second blocks (210) corresponding to the first grooves (201) one by one and / or second grooves (211) corresponding to the first blocks (207) one by one are protruded on the inner wall of the skeleton (21). The first blocks (207) and the second blocks (210) are respectively received in the second grooves (211) and the first grooves (201) by interference fit.

5. The elevator door according to claim 4, characterized in that, Both the first groove (201) or the second groove (211) includes an outer notch (202), and the outer notch (202) trends to converge towards its opening along the symmetry axis passing through the center of the stator core (20), so as to guide the mating action between the stator core (20) and the skeleton (21) to converge inward.

6. The elevator door according to claim 5, characterized in that, The motor further includes at least a pair of symmetrically arranged limit blocks (203). The limit blocks (203) are arranged on the inner side wall forming the first groove (201) or the second groove (211), or on the outer side wall of the skeleton (21). The connection line between the opposite end points of the limit block (203) trends to expand towards its opening along the symmetry axis passing through the center of the stator core (20), so as to abut and limit the inner structure after the stator core (20) and the skeleton (21) are mated.

7. The elevator door according to claim 5, characterized in that, The outer notch (202) is in a positive eight - character shape with its opening as the reference, and the opening of the outer notch (202) is formed at the outer edge of the first groove (201) or the second groove (211).

8. The elevator door according to claim 6, characterized in that, The limit block (203) is in a bow shape in the axial cross - section perpendicular to the motor, and the circular angle corresponding to the bow shape is 160 - 240°.

9. The elevator door according to claim 8, characterized in that, The limiting block (203) is semicircular, and the directions (X) of the diameters of a pair of the limiting blocks (203) form an inverted V shape with the opening as the reference, so as to abut and limit the inner structure after the stator core (20) and the skeleton (21) are assembled.

10. The elevator door according to claim 8, characterized in that, When the stator core (20) and the skeleton (21) are assembled, the docking seam (206) can play a marking role to facilitate subsequent lead wire and wire arranging processes. Preferably, the ratio of the sum of the arc lengths (L) of several of the 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 2.5 mm. Preferably, the ratio of the depth (h) of the first groove (201) or the second groove (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. Preferably, the housing (1) includes a first housing body (10) and a second housing body (11), the first housing body (10) and the second housing body (11) are fixedly connected, and both can accommodate the stator part (2). Preferably, a protection cavity (100) is provided on one side of the first housing body (10) facing the stator part (2), and a part of the motor protection cover (4) is accommodated in the protection cavity (100). Preferably, the motor further includes a transmission shaft (5), the transmission shaft (5) is rotatably connected to the first housing body (10) and the second housing body (11) through bearings (6), and the protection cover (4) is fixedly connected to the transmission shaft (5) and can accommodate the stator part (2). Preferably, the rotor part (3) is arranged between the outer edge of the skeleton (21) and the protection cover (4), the rotor part (3) is fixedly connected to the protection cover (4), and the rotor part (3) is in clearance fit with the skeleton (21) and is arranged opposite in the radial direction. Preferably, a boss (101) is further provided on one side of the first housing body (10) facing the stator part (2), and the stator core (20) is press-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. Different stator iron blocks (200) are sequentially connected through the interference fit between the protrusion (204) and the groove (205). Preferably, among two adjacent stator iron blocks (200), at least one protrusion (204) is provided at both ends of one of the stator iron blocks (200), and at least one groove (205) is provided 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). Preferably, among two adjacent stator iron blocks (200), projections (204) and grooves (205) are provided at both ends of each stator iron block (200), and different stator iron blocks (200) are sequentially connected through interference fit between the projections (204) and the grooves (205). Preferably, the radial line along the end joint surface of two adjacent stator iron blocks (200) passes through the center of the circle of the stator portion (2). Preferably, the radial line along the end joint surface of two adjacent stator iron blocks (200) bisects the corresponding first groove body (201). Preferably, the cross-section of the projection (204) in the radial direction is bow-shaped, and the central angle corresponding to the bow shape is 60 - 300°. Preferably, the cross-section of the projection (204) in the radial direction is irregular, and the surface of the projection (204) facing the outside is wavy or serrated. Preferably, the ratio of the extension length of the projection (204) in the radial direction to the width of the stator iron block (200) is 0.45 - 0.

55. Preferably, the butt joint seam (206) includes a first butt joint part and a second butt joint part. The butt joint of the projection (204) and the groove (205) forms the first butt joint part, and the other parts of the end of the stator iron block (200) form the second butt joint part. The difference between the initial size of the first butt joint part and the second butt joint part is 0.1 - 0.15 mm. Preferably, the stator iron block (200) is arc-shaped, and at least two stator iron blocks (200) are snap-connected to form a stator core (20) in a circular ring shape.

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