Stepping motor with stator core provided with rivets

Abstract

The utility model relates to the technical field of stepping motors, in particular to a stepping motor with a stator core provided with rivets, which comprises an end cover assembly, a stator assembly and a rotor assembly, the end cover assembly comprises a front end cover and a rear end cover, the stator assembly is positioned between the front end cover and the rear end cover, the stator assembly comprises a framework assembly and a stator core, and the framework assembly is connected with the stator core. The framework combination comprises a front framework and a rear framework, the stator core is located between the front framework and the rear framework, the stator core comprises a plurality of iron core sheets and a plurality of rivets, the rivets are arranged in an annular array around the central axes of the iron core sheets and penetrate through the iron core sheets, and the iron core sheets are arranged in a stacked mode and coincide with one another. According to the utility model, the iron core sheets are riveted and connected through the rivets, so that the connection strength of the iron core sheets is improved, the risk of position displacement of the iron core sheets at a high temperature is reduced, and the advantage of high connection strength between two adjacent iron core sheets is realized.

Description

Technical Field

[0001] The present application relates to the technical field of stepper motors, and more specifically to a stepper motor with a stator core having rivets. Background Art

[0002] A stepper motor is an electric motor that converts an electrical pulse signal into a corresponding angular displacement or linear displacement. Each time a pulse signal is input, the rotor rotates an angle or moves forward one step. A stepper motor includes a stator core, which is used to place coil windings. The coil windings generate a magnetic field and make the rotor rotate after being energized.

[0003] Our company currently has a stator core for stepper motors, such as Figure 1 As shown, it includes a plurality of iron core sheets 90, each of which has four connection holes 901 arranged in a circular array. It should be noted that the stator core is arranged between the front cover and the rear cover of the stepper motor. During installation, the long bolt passes through the corresponding connection holes 901 on each of the iron core sheets 90 from the rear cover, and then connects with the front cover, thereby realizing the connection between the stator core and the front and rear cover. In addition, the rotor assembly of the stepper motor is rotatably installed on the front and rear cover and passes through the stator core. However, when the long bolt passes through each of the iron core sheets 90, the long bolt and the iron core sheets 90 are actually not connected to each other. The connection strength of the adjacent two iron core sheets 90 is only based on the connection strength formed when the punching sheets are stacked and riveted, and the connection strength is relatively low. After the motor runs for a long time, the temperature is high, which easily causes slight deformation of the motor components under high temperature, and makes the adjacent two iron core sheets 90 not completely overlap, but partially misaligned, and causes the motor rotor and the misaligned iron core sheets 90 to produce motion interference, resulting in a decrease in operating torque and a shortened service life.

[0004] Therefore, there is a need to provide a stepper motor with a stator core and rivets with high connection strength between two adjacent iron core sheets. Utility Model Content

[0005] The main purpose of the present application is to provide a stepper motor with a stator core with rivets, wherein the stepper motor with a stator core with rivets comprises an end cover assembly, a stator assembly and a rotor assembly, the end cover assembly comprises a front end cover and a rear end cover, the stator assembly is located between the front end cover and the rear end cover, the stator assembly comprises a frame assembly and a stator core, the frame assembly comprises a front frame and a rear frame, the stator core is located between the front frame and the rear frame, the stator core comprises a plurality of iron core sheets and a plurality of rivets, the rivets are arranged in an annular array around the central axis of the iron core sheets and penetrate each of the iron core sheets, and each of the iron core sheets is arranged in a stacked manner and overlapped, the rotor assembly is rotatably mounted on the end cover assembly, and the stator assembly is sleeved on the rotor assembly, and each of the iron core sheets is riveted and connected by rivets. Compared with the prior art, it has the advantage of high connection strength between two adjacent iron core sheets.

[0006] Another object of the present application is to provide a stepper motor with a stator core with rivets, wherein each of the four corners of the iron core sheet has a first concave arc notch, each side of each of the iron core sheet has a connecting hole, a rivet and a plurality of second concave arc notches, and the second concave arc notches are located between the corresponding connecting holes and the rivets. By providing the first concave arc notches and the second concave arc notches, compared with the prior art, the side surface area of ​​the stator core is larger, which is conducive to heat exchange with the external air.

[0007] In order to achieve at least one of the above-mentioned invention purposes, the present application provides a stepper motor with a stator core having rivets, wherein the stepper motor with a stator core having rivets comprises:

[0008] an end cover assembly, the end cover assembly comprising a front end cover and a rear end cover; and

[0009] a stator assembly, the stator assembly being located between the front cover and the rear cover, the stator assembly comprising a frame assembly and a stator core, the frame assembly comprising a front frame and a rear frame, the stator core being located between the front frame and the rear frame, the stator core comprising a plurality of core sheets and a plurality of rivets, the rivets being arranged in an annular array around the central axis of the core sheets and penetrating each core sheet, so that each core sheet is arranged in a stacked manner and overlaps; and

[0010] A rotor assembly is rotatably mounted on the end cover assembly, and the stator assembly is sleeved on the rotor assembly.

[0011] In one or more embodiments of the present application, each of the iron core sheets is square and has a plurality of connecting holes, the connecting holes are arranged in a circular array around the central axis of the iron core sheet, and each side of each of the iron core sheets is provided with a connecting hole and a rivet, and the connecting holes and the rivets are arranged symmetrically.

[0012] In one or more embodiments of the present application, each of the four corners of the iron core sheet has a first concave arc notch.

[0013] In one or more embodiments of the present application, each side of each of the iron core sheets has a plurality of second concave arc notches, and the second concave arc notches are located between the corresponding connecting holes and the rivets.

[0014] In one or more embodiments of the present application, each of the iron core sheets has a plurality of accommodating holes, a plurality of partition grooves and a through hole, the accommodating holes are located on the outside of the through hole, and the accommodating holes are arranged in a circular array around the central axis of the iron core sheet, the partition grooves correspond to the accommodating holes one by one, and the two ends of each of the partition grooves are respectively connected to the through hole and the corresponding accommodating hole to form the same number of magnetic poles as the accommodating holes.

[0015] In one or more embodiments of the present application, each of the iron core sheets has a plurality of punching riveting points.

[0016] In one or more embodiments of the present application, the stepper motor with a stator core having rivets further includes an encoder, which is located at an end of the rear end cover away from the stator assembly, and the encoder is connected to the rear end cover.

[0017] In an embodiment of the present application, a stepper motor with a stator core with rivets includes an end cover assembly, a stator assembly and a rotor assembly, the end cover assembly includes a front cover and a rear cover, the stator assembly is located between the front cover and the rear cover, the stator assembly includes a frame assembly and a stator core, the frame assembly includes a front frame and a rear frame, the stator core is located between the front frame and the rear frame, the stator core includes a plurality of iron core sheets and a plurality of rivets, the rivets are arranged in a circular array around the central axis of the iron core sheet and penetrate each iron core sheet, and each iron core sheet is arranged in a stacked manner and overlapped, the rotor assembly is rotatably mounted on the end cover assembly, and the stator assembly is sleeved on the rotor assembly, and each iron core sheet is riveted and connected by setting rivets, thereby improving the connection strength of two adjacent iron core sheets, reducing the risk of iron core sheets moving in position at high temperatures, and having the advantage of high connection strength between two adjacent iron core sheets compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] These and / or other aspects and advantages of the present application will become clearer and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0019] Figure 1 The figure shows a structural schematic diagram of a stator core for a conventional stepping motor;

[0020] Figure 2 The figure shows a half-section view of a stepping motor with a stator core having rivets according to an embodiment of the present application;

[0021] Figure 3 The figure shows a schematic structural diagram of an iron core sheet according to an embodiment of the present application;

[0022] Figure 4 The figure shows a schematic diagram of the structure of the front skeleton. DETAILED DESCRIPTION

[0023] The terms and words used in the following specification and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustrative purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0024] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0025] Although ordinals such as "first," "second," and the like will be used to describe various components, those components are not limited herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more associated listed items.

[0026] The terms used herein are only used for the purpose of describing various embodiments and are not intended to be limiting. As used herein, singular forms are intended to also include plural forms, unless the context clearly indicates an exception. In addition, it will be understood that the terms "including" and / or "having" when used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0027] Application Overview

[0028] There is an existing stepper motor stator core, which includes several iron core sheets. When a long bolt passes through each iron core sheet, the long bolt and the iron core sheet are not connected to each other, and the connection strength between two adjacent iron core sheets is low. The high temperature of the motor after long-term operation will cause the iron core sheets to be misaligned and interfere with the movement of the motor rotor, causing the operating torque of the stepper motor to decrease and the service life to be shortened.

[0029] Based on the above technical problems, the present application proposes a stepper motor with rivets on the stator core, wherein the stepper motor with rivets on the stator core has a simple structure, does not involve complicated manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the stepper motor with rivets on the stator core provided by the present application is easy to produce and low in cost, which is more conducive to controlling production costs and further conducive to product promotion and use.

[0030] Schematic stator core of a stepper motor with rivets,

[0031] refer to Figures 2 to 4 According to a preferred embodiment of the utility model, a stepping motor with a stator core having rivets includes an end cover assembly 10, a stator assembly 20 and a rotor assembly 30.

[0032] Specifically, Figure 2 As shown, the end cover assembly 10 includes a front end cover 101 and a rear end cover 102; the stator assembly 20 is located between the front end cover 101 and the rear end cover 102, the rotor assembly 30 is rotatably mounted on the end cover assembly 10, and the stator assembly 20 is sleeved on the rotor assembly 30.

[0033] More specifically, if Figure 2 As shown, the stator assembly 20 includes a frame assembly 201 and a stator core 202. The frame assembly 201 includes a front frame 2011 and a rear frame 2012. The stator core 202 is located between the front frame 2011 and the rear frame 2012. Figure 3 As shown, the stator core 202 includes a plurality of core sheets 2021 , and each core sheet 2021 is stacked and overlapped to form the stator core 202 .

[0034] In addition, in order to accommodate the rotor assembly 30, as Figure 3 As shown, each of the core pieces 2021 has a through hole 20211 , and the central axis of the through hole 20211 coincides with the central axis of the core piece 2021 .

[0035] In addition, in order to realize the connection between the skeleton assembly 201 and the stator core 202, as shown in FIG. Figure 3 and Figure 4As shown, the front frame 2011 and the rear frame 2012 have a plurality of placement convex rings 20111 at one end close to the stator core 202, and each of the iron core pieces 2021 has a plurality of accommodating holes 20212 and a plurality of partition grooves 20213. The accommodating holes 20212 are located on the outside of the through hole 20211, and the accommodating holes 20212 are arranged in a circular array around the central axis of the iron core piece 2021, and the partition grooves 20213 correspond to the accommodating holes 20212 one by one, and the two ends of each of the partition grooves 20213 are respectively connected to the through hole 20211 and the corresponding accommodating hole 20212 to form a magnetic pole end 20214 of the same number as the accommodating hole 20212. The placement convex ring 20111 corresponds to the receiving hole 20212 one by one. During installation, each placement convex ring 20111 of the front frame 2011 and the rear frame 2012 extends into the receiving hole 20212 corresponding to the stator core 202 by a predetermined distance, and the ends of the front frame 2011 and the rear frame 2012 away from the placement convex ring 20111 extend into the front cover 101 and the rear cover 102 respectively, and the coil is simultaneously wound around the inner wall surface of the placement convex ring 20111 of the front frame 2011 and the rear frame 2012 and the hole wall of the receiving hole 20212 of each iron core 2021. It should be noted that when the coil is energized, the rotor assembly 30 rotates.

[0036] In addition, in order to realize the connection between the skeleton assembly 201, the stator core 202, the front cover 101 and the rear cover 102, as shown in FIG. Figure 3 As shown, each of the iron core pieces 2021 has a plurality of connection holes 20215, and the connection holes 20215 are arranged in a circular array around the central axis of the iron core piece 2021. In the embodiment of the present application, the number of the connection holes 20215 is four, and the angle between two adjacent connection holes 20215 and the central axis of the iron core piece 2021 is 90°; in addition, as Figure 1 As shown, the stepper motor with rivets on the stator core 202 also includes four long bolts 40, and the long bolts 40 correspond to the connecting holes 20215 one by one. One end of each of the long bolts 40 is screwed into the front end cover 102 and passes through the corresponding connecting hole 20215, and is threadedly connected to the front end cover 101. It should be added that the hole wall of the connecting hole 20215 is a smooth wall, and the long bolt 40 only contacts the hole wall surface of the connecting hole 20215 when passing through the connecting hole 20215.

[0037] It should be noted that after the stepper motor with rivets on the stator core 202 has been working for a period of time, the coil wound around the front frame 2011, the stator core 202 and the rear frame 2012 generates a large amount of heat, which can easily cause the front frame 2011, the rear frame 2012 and the long bolts 40 used to connect each iron core 2021 to undergo local micro deformation under high temperature. Because the placement convex ring 20111 of the front frame 2011 and the rear frame 2012 are connected to some of the iron cores 2021, this causes the iron core 2021 to be subjected to a circumferential deformation force and cause local misalignment between two adjacent iron cores 2021, and causes motion interference between the motor rotor and the misaligned iron core 2021, resulting in a decrease in operating torque and a shortened service life.

[0038] In view of this, in the embodiment of the present application, in order to prevent the core piece 2021 from being partially dislocated after being subjected to the circumferential force, the connection strength of each core piece 2021 is improved, such as Figure 3 As shown, each of the iron core sheets 2021 further includes a plurality of rivet holes 20216. In the embodiment of the present application, the number of the rivet holes 20216 is four, and each of the iron core sheets 2021 is square. Each side of each of the iron core sheets 2021 has a connection hole 20215 and a rivet hole 20216, and the connection holes 20215 and the rivet holes 20216 are symmetrically arranged. In addition, as Figure 3 As shown, the stator core 202 also includes a plurality of rivets 2022, and the rivets 2022 correspond to the riveting holes 20216 one by one. The rivets 2022 are arranged in a circular array around the central axis of the iron core 2021 and penetrate the corresponding riveting holes 20216 on each of the iron cores 2021. The rivets 2022 are used to achieve the riveting connection of each of the iron cores 2021. When each of the iron cores 2021 is riveted, the connection holes 20215 and the rivets 2022 on each side of the stator core 202 are symmetrically arranged. It should be noted that by opening the rivet hole 20216 on the iron core sheet 2021 and riveting each iron core sheet 2021 through the rivet 2022, compared with the prior art, the connection strength of the stator core 202 is high. When the motor works for a long time, the stator core 202 is not easy to be dislocated under high temperature. Compared with the prior art, it has the advantage of high connection strength between two adjacent iron core sheets 2021.

[0039] Furthermore, since the outer side of the stator core 202 is in direct contact with the external air, increasing the surface area of ​​the outer side of the stator core 202 is helpful for heat exchange between the stator core 202 and the external air, thereby reducing the influence of high temperature on the stator core 202 .

[0040] In view of this, in the embodiment of the present application, in order to increase the surface area of ​​the outer side of the stator core 202, as shown in FIG. Figure 3 As shown, each of the four corners of the iron core sheet 2021 has a first concave arc notch 20217, and the connection between each of the first concave arc notch 20217 and each side of the stator core 202 is transitioned with a rounded corner; in addition, each side of each of the iron core sheets 2021 has a plurality of second concave arc notches 20218. In the embodiment of the present application, the second concave arc notches 20218 correspond to the connecting holes 20215 one by one, and the second concave arc notches 20218 are located between the corresponding connecting holes 20215 and the rivet 2022. It should be noted that both the first concave arc notch 20217 and the second concave arc notch 20218 have a concave arc surface, and its surface area is larger than that of a straight plane. Compared with the prior art, the outer surface area of ​​the stator core 202 is larger, and the heat dissipation performance is better.

[0041] Furthermore, in order to improve the connection strength of each of the iron core sheets 2021 during riveting, as Figure 3 As shown, each of the iron core pieces 2021 has a plurality of punching rivet points 20219. Specifically, each of the magnetic pole ends 20214 has a punching rivet point 20219. Each side of each of the iron core pieces 2021 also has two punching rivet points 20219 located between the connecting hole 20215 and the rivet hole 20216.

[0042] Further, in the embodiments of the present application, Figure 2 As shown, the stepper motor with rivets on the stator core further includes an encoder 50. The encoder 50 is located at one end of the rear end cover 102 away from the stator assembly 20. The encoder 50 is connected to the rear end cover 102 by threaded connection.

[0043] In summary, the stepper motor with rivets on the stator core according to the embodiment of the present application is explained, which provides the stepper motor with rivets on the stator core with advantages such as high connection strength between two adjacent iron core sheets.

[0044] It is worth mentioning that in the embodiment of the present application, the stator core stepper motor with rivets has a simple structure, does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the stator core stepper motor with rivets provided by the present application is easy to produce and has low cost, which is more conducive to controlling production costs and further conducive to product promotion and use.

[0045] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A stepping motor with a stator core having rivets, characterized in that: The stepper motor with stator core and rivets comprises an end cover assembly, the end cover assembly comprising a front end cover and a rear end cover; and A stator assembly, the stator assembly is located between the front cover and the rear cover, the stator assembly includes a frame assembly and a stator core, the frame assembly includes a front frame and a rear frame, the stator core is located between the front frame and the rear frame, the stator core includes a plurality of iron sheets and a plurality of rivets, the rivets are arranged in an annular array around the central axis of the iron sheets and penetrate each of the iron sheets, and each of the iron sheets is arranged in a stacked arrangement and overlapped, each of the iron sheets is square and has a plurality of connecting holes, the connecting holes are arranged in an annular array around the central axis of the iron sheets, and each side of each of the iron sheets is provided with a connecting hole and a rivet, and the connecting holes and the rivets are arranged symmetrically, and each of the four corners of each of the iron sheets has a first concave arc notch; as well as A rotor assembly is rotatably mounted on the end cover assembly, and the stator assembly is sleeved on the rotor assembly.

2. The stepper motor with rivets on the stator core according to claim 1, characterized in that: Each side of each of the iron core sheets is provided with a plurality of second concave arc notches, and the second concave arc notches are located between the corresponding connecting holes and the rivets.

3. The stepper motor with rivets on the stator core according to claim 2, characterized in that: Each of the iron core sheets has a plurality of accommodating holes, a plurality of partition grooves and a through hole. The accommodating holes are located on the outside of the through hole, and the accommodating holes are arranged in a circular array around the central axis of the iron core sheet. The partition grooves correspond to the accommodating holes one by one, and the two ends of each of the partition grooves are respectively connected to the through hole and the corresponding accommodating hole to form the same number of magnetic poles as the accommodating holes.

4. The stepping motor with rivets on the stator core according to claim 3, characterized in that: Each of the iron core sheets has a plurality of punching riveting points.

5. The stepping motor with rivets on the stator core according to any one of claims 1 to 4, characterized in that: The stepper motor with rivets on the stator core further includes an encoder, which is located at an end of the rear end cover away from the stator assembly and is connected to the rear end cover.

Images