Improved motor
By using the positioning device of connecting plates, positioning pins and fasteners in the motor, the circumferential and axial fixation of the motor is achieved, solving the problem of difficulty in verifying the extrusion stress when transmitting large torque, simplifying the assembly process and reducing the Complexity.
Patent Information
- Application Number
- CN202420051441.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-09
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-09
AI Technical Summary
When existing motors transmit large torque, the axial fixing design can easily lead to difficulty in checking extrusion stress, and increasing the high or number of keys will increase assembly difficulty.
Using a positioning device including a connecting plate, a first positioning pin and a fastener, the connecting plate is fixed with the axial overlapping part of the machine base and the stator core, and the interference fit between the first and second positioning pins and the pin holes is used. , combined with the design of positioning grooves and guide grooves, double fixation of the circumferential and axial directions is achieved, reducing assembly complexity.
It effectively increases the contact area of the extrusion stress, reduces assembly difficulty, and cancels the traditional stator core plate design, simplifying the fixing process of the motor.
Smart Images
Figure CN222169414U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to an improved motor. Background Art
[0002] In the existing motor, the fixing design of the stator core 2 and the base 1 usually requires circumferential fixing and axial fixing, such as Figure 1 and Figure 2 As shown, the circumferential fixing method is generally implemented by using one or more sets of keyways and ordinary flat keys 100; the axial fixing method is generally implemented by using one or more sets of stator core pressure plates 200. When the conventional flat key 100 is used to transmit torque, the shear stress and extrusion stress need to be checked when checking the strength.
[0003] When checking shear stress -------①
[0004] When checking the extrusion stress -------②
[0005] Wherein, T is the torque that the motor needs to transmit. R is the radius of the cylindrical surface of the motor stator and the base 1. l is the working length of the flat key 100. b is the width of the flat key 100. k is the working height of the flat key 100, which is generally 0.4h, and h is the height of the flat key 100.
[0006] The commonly used flat key 100 model ,so , so we can conclude -----③
[0007] The base 1 of a general motor is generally made of castings, the core is generally made of silicon steel sheets, and the key is generally made of steel. The allowable extrusion stress of the weakest material among the wheel, hub and flat key 100 is required. The motor frame 1 generally uses a casting, so The allowable extrusion stress of the casting is usually taken. The allowable shear stress of the flat key 100 needs to be taken, and the material of the flat key 100 is generally steel, so ----④
[0008] Therefore, it is known from ①②③④ that the extrusion stress is more demanding in the verification of torque transmission by flat key 100. Therefore, when the required output torque T is large and the core length is short, the extrusion verification will be difficult. At this time, the usual practice is to increase the model of flat key 100 (i.e. increase the key height h) or increase the number of flat keys 100. However, increasing the model size of flat key 100 will be limited by the wall thickness of base 1 and the size of core punching sheet, and increasing the number of flat keys 100 will increase the difficulty of assembly. Utility Model Content
[0009] The utility model aims to provide an improved motor with reduced assembly difficulty.
[0010] The purpose of the utility model is achieved in this way.
[0011] An improved motor includes a base, a stator core and a positioning device, wherein the positioning device includes a connecting plate, a first positioning pin and a fastener.
[0012] The connecting plate has a first portion overlapping with the stator core in the axial direction and a second portion overlapping with the base in the axial direction.
[0013] One of the base and the stator core is provided with a first pin hole, and the other is connected and fixed by a fastener and a connecting plate. The first positioning pin passes through the corresponding first position or second position on the connecting plate and is connected with the corresponding first pin hole.
[0014] The above technical solution can be further improved as follows.
[0015] In a more specific solution, the positioning device also includes a second positioning pin, and the end face of one of the base and the stator core is provided with the first pin hole, and the end face of the other is provided with a second pin hole, and the second positioning pin passes through the first part or the second part of the connecting plate and is connected to the corresponding second pin hole.
[0016] In a more specific solution, the minimum distance between the side wall of the first pin hole or the second pin hole on the stator core and the inner circumference of the stator core and the base is greater than zero, so as to prevent the positioning pin inserted into the stator core from contacting the base.
[0017] In a more specific solution, a positioning groove with a width of B is provided on the inner circumference of the stator core, the width of the positioning groove is smaller than the diameter of the first pin hole or the second pin hole on the stator core, a guide groove is provided on the machine base, and the positioning groove and the guide groove are aligned and matched for positioning and assembling the machine base and the stator core. The machine base and the stator core are easy to position.
[0018] In a more specific solution, the center of the guide groove and the axis of the machine base are connected in a straight line, and the center of the first pin hole or the second pin hole on the stator core and the axis of the machine base are connected in a straight line, and the two straight lines coincide or have a first angle.
[0019] In another more specific solution, the center of the first pin hole or the second pin hole on the machine base and the machine base axis are connected in a straight line, and the center of the second pin hole or the first pin hole on the stator core and the machine base axis are connected in a straight line, and the two straight lines coincide or have a second angle.
[0020] In a more specific solution, a step surface is provided at the tail end of the matching cylindrical surface of the machine base and the stator core, and the step surface is used for inserting the first positioning pin or the second positioning pin of the stator core to abut against each other.
[0021] In a more specific solution, one of the first positioning pin and the second positioning pin is a cylindrical pin and the other is an elastic cylindrical pin, the first positioning pin and the first pin hole are interference fit, and the second positioning pin and the second pin hole are interference fit. The first positioning pin and the second positioning pin cooperate to limit the circumferential displacement of the machine base and the stator core, and the elastic cylindrical pin is easy to install.
[0022] In another more specific solution, one of the machine base and the stator core is only connected and fixed to the connecting plate by a fastener, and the fastener is a bolt pair. The preload force generated when the bolt pair is tightened and the mounting surface of the machine base or the stator core overcomes the torque through friction.
[0023] In a more specific solution, there are two fasteners, and the two fasteners and the first positioning pin are arranged in a herringbone shape.
[0024] The beneficial effects of the utility model are as follows.
[0025] The positioning device of the utility model can be effectively used for the circumferential fixation of the machine base and the stator core, and can also play the role of axial fixation. Compared with the traditional keyway, it effectively increases the contact area for checking the extrusion stress, and also reduces the assembly difficulty when multiple sets of pins are used for connection at the same time. Moreover, the first positioning pin and the second positioning pin can be used for axial fixation by interference fit with their matching holes respectively. Compared with the existing ones, the design of the traditional stator core pressure plate is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of the prior art.
[0027] Figure 2 It is a schematic diagram of the decomposition structure of the prior art.
[0028] Figure 3 It is a structural diagram of embodiment 1.
[0029] Figure 4 This is a schematic diagram of the decomposed structure of Example 1.
[0030] Figure 5 for Figure 3 Schematic diagram of the local cross-section structure along AA direction.
[0031] Figure 6 for Figure 5 Enlarged view of part C in the middle.
[0032] Figure 7 It is a partial schematic diagram of the alignment of the positioning groove and the guide groove in the first embodiment.
[0033] Figure 8 It is a schematic diagram of the positioning structure of the positioning device, the base and the stator core in the first embodiment.
[0034] Fig. 9This is a schematic diagram of the positioning of the base and stator core in Example 1.
[0035] Fig.10 This is a schematic diagram of the positioning of the base and stator core in the second embodiment.
[0036] Fig.11 This is a schematic diagram of the positioning structure of the positioning device, base and stator core in Example 3.
[0037] Fig.12 It is a schematic diagram of the positioning structure of the positioning device, the base and the stator core in the fourth embodiment. DETAILED DESCRIPTION
[0038] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0039] Example 1, see Figure 3-9 As shown, an improved motor includes a base 1, a stator core 2 and a positioning device 3. In this embodiment, the positioning device 3 includes a connecting plate 4, a first positioning pin 5, two fasteners 6 and a second positioning pin 7. The connecting plate 4 has a first portion 41 overlapping with the stator core 2 in the axial direction and a second portion 42 overlapping with the base 1 in the axial direction.
[0040] The end surface of the stator core 2 is provided with a first pin hole 8, and the inner circumference of the stator core 2 is provided with a positioning groove 21 with a width B. The width of the positioning groove 21 is smaller than the diameter of the first pin hole 8 on the stator core 2. The minimum distance between the side wall of the first pin hole 8 on the stator core 2 and the inner circumference of the stator core 2 and the base 1 is The positioning groove 21 is connected to the first pin hole 8 . The stator core 2 is composed of a plurality of single cores 20 connected in a concave-convex manner to form a circular ring, and each single core 20 is provided with the first pin hole 8 and the positioning groove 21 .
[0041] The end surface of the base 1 is provided with two screw holes 12 and a second pin hole 11, the second pin hole 11 is located between the two screw holes 12, and is arranged in a straight line. The outer peripheral surface of the base 1 and the stator core 2 is provided with a guide groove 13. The guide groove 13 and the positioning groove 21 have the same width.
[0042] When the positioning groove 21 and the guide groove 13 are aligned and positioned, the two fasteners 6 and the first positioning pin 5 are arranged in a herringbone shape. At this time, the center of the guide groove 13 and the axis of the base 1 are connected in a straight line, and the center of the first pin hole 8 on the stator core 2 and the axis of the base 1 are connected in a straight line. The two straight lines coincide, and the center of the second pin hole 11 of the base 1 also coincides with the straight line. The fastener 6 is a bolt.
[0043] The first portion 41 of the connecting plate 4 is provided with a first positioning hole 43, and the second portion 42 is provided with a second positioning hole 44 and two through holes 45. The first positioning pin 5 passes through the first positioning hole 43 and is inserted into the first pin hole 8. The tail end of the matching cylindrical surface of the machine base 1 and the stator core 2 is provided with a step surface 14, and the first pin hole 8 and the step surface 14 abut against each other. The second positioning pin 7 passes through the second positioning hole 44 and is inserted into the second pin hole 11. The bolt passes through the through hole 45 and is threadedly connected with the screw hole 12 to achieve a fixed connection between the connecting plate 4 and the machine base 1. Among them, the first positioning pin 5 is a cylindrical pin, and the second positioning pin 7 is an elastic cylindrical pin. The first positioning pin 5 and the first pin hole 8 are interference fit, and the second positioning pin 7 and the second pin hole 11 are interference fit.
[0044] In this way, after the first locating pin 5 and the second locating pin 7 are installed, if the stator core 2 rotates relative to the machine base 1, that is, the first pin hole 8 has a moving trajectory L1, and at the same time, the existence of the positioning device 3 causes the first pin hole 8 to move and also rotate around the second pin hole 11, that is, the first pin hole 8 has a moving trajectory L2, and the moving trajectory L1 and the moving trajectory L2 have only one overlapping point, and there is motion interference outside the point, thereby avoiding relative displacement of the stator core 2 and the machine base 1 in the circumferential direction. At the same time, the existence of the connecting plate 4 also avoids axial displacement of the stator core 2 and the machine base 1.
[0045] The number of positioning devices 3 is based on the contact area (i.e. ) is determined, d is the diameter of the first positioning pin 5.
[0046] Of course, in this embodiment, the connection structures of the positioning device 3 and the stator core 2 and the base 1 are interchangeable.
[0047] Example 2, see Fig.10 , which is different from the first embodiment in that: the center of the guide slot 13 and the axis of the base 1 are connected in a straight line, and the first pin hole 8 on the stator core 2 and the axis of the base 1 are connected in a straight line, and the two straight lines have a first angle α. Specifically, the first pin hole 8, the second pin hole 11 and the axis of the base 1 are on the same straight line, and the straight line and the straight line connecting the center of the slot and the axis of the base 1 have a first angle α. That is, the positions of the positioning slots 21 and the guide slots 13 of the stator core 2 and the base 1 are staggered from the positioning device 3.
[0048] Example 3, see Fig.11, which is different from the first embodiment in that: the center of the second pin hole 11 on the base 1 and the axis of the base 1 are connected in a straight line, and the center of the first pin hole 8 on the stator core 2 and the axis of the base 1 are connected in a straight line, and the two straight lines have a second angle β. After the first positioning pin 5 and the second positioning pin 7 are installed, if the stator core 2 rotates relative to the base 1, that is, the first pin hole 8 has a moving trajectory L1, and at the same time, the existence of the positioning device 3 causes the movement of the first pin hole 8 to rotate around the second pin hole 11, that is, the first pin hole 8 has a moving trajectory L2, and the moving trajectory L1 and the moving trajectory L2 have only one overlapping point, and there is motion interference outside of it, thereby avoiding relative displacement of the stator core 2 and the base 1 in the circumferential direction. At the same time, the existence of the connecting plate 4 also avoids displacement of the stator core 2 and the base 1 in the axial direction.
[0049] Example 4, see Fig.12 , which is different from the first embodiment in that the machine base 1 and the connecting plate 4 are connected and fixed only by the fastener 6. The fastener 6 is a bolt pair, and the pre-tightening force generated when the bolt pair is tightened and the mounting surface of the machine base 1 overcomes the torque through friction.
Claims
1. An improved motor, comprising a base and a stator core, characterized in that: It also includes a positioning device, which includes a connecting plate, a first positioning pin and a fastener, The connecting plate has a first portion overlapping with the stator core in the axial direction and a second portion overlapping with the base in the axial direction. The end face of one of the base and the stator core is provided with a first pin hole, the end face of the other and the connecting plate are connected and fixed by fasteners, and the first positioning pin passes through the first position or the second position on the connecting plate and is connected with the corresponding first pin hole.
2. The improved motor according to claim 1, characterized in that: The positioning device also includes a second positioning pin. The end face of one of the base and the stator core is provided with the first pin hole, and the end face of the other is provided with a second pin hole. The second positioning pin passes through the first part or the second part of the connecting plate and is connected with the corresponding second pin hole.
3. The improved motor according to claim 2, characterized in that: The minimum distance between the side wall of the first pin hole or the second pin hole on the stator core and the inner circumferential surface of the stator core and the base is greater than zero.
4. The improved motor according to claim 3, characterized in that: The inner circumference of the stator core is provided with a positioning groove with a width of B, the width of which is smaller than the diameter of the first pin hole or the second pin hole on the stator core. The machine base is provided with a guide groove, and the positioning groove and the guide groove are aligned and matched for positioning and assembling the machine base and the stator core.
5. The improved motor according to claim 4, characterized in that: The center of the guide groove and the axis of the machine base are connected in a straight line, and the center of the first pin hole or the second pin hole on the stator core and the axis of the machine base are connected in a straight line, and the two straight lines coincide or have a first angle.
6. The improved motor according to claim 4, characterized in that: The center of the first pin hole or the second pin hole on the machine base and the machine base axis are connected in a straight line, and the center of the second pin hole or the first pin hole on the stator core and the machine base axis are connected in a straight line, and the two straight lines coincide or have a second angle.
7. The improved motor according to claim 2, characterized in that: The tail ends of the matching cylindrical surfaces of the machine base and the stator core are provided with a step surface, and the step surface is used for inserting the first positioning pin or the second positioning pin of the stator core to abut against each other.
8. The improved motor according to claim 2, characterized in that: One of the first positioning pin and the second positioning pin is a cylindrical pin and the other is an elastic cylindrical pin. The first positioning pin and the first pin hole are interference fit, and the second positioning pin and the second pin hole are interference fit.
9. The improved motor according to claim 1, characterized in that: One of the machine base and the stator core is only connected and fixed to the connecting plate by a fastener, which is a bolt pair. The preload force generated when the bolt pair is tightened and the mounting surface of the machine base or the stator core overcomes the torque through friction.
10. The improved motor according to claim 1, characterized in that: There are two fasteners, and the two fasteners and the first positioning pin are arranged in a herringbone shape.