A permanent magnet electric drum

Abstract

This application relates to a permanent magnet electric roller, belonging to the field of motors, and includes a mounting base, a permanent magnet electric roller body, and an expansion sleeve assembly. The mounting base has a mounting through hole; the permanent magnet electric roller body includes a stator spindle, which passes through the mounting through hole; the expansion sleeve assembly is located between the mounting through hole and the stator spindle; when the stator spindle and the mounting through hole have relative rotation or a tendency to rotate relative to each other, the mounting through hole generates a limiting torque through the expansion sleeve assembly to limit the rotation of the stator spindle. When the permanent magnet electric roller is subjected to severe impact loads, the expansion sleeve assembly can absorb impact energy through slight deformation, and the stator spindle can slide relative to the expansion sleeve assembly, converting the impact energy into heat, thereby reducing the impact on the stator spindle. In addition, even if the impact is too large and causes the expansion sleeve assembly to fail, only the expansion sleeve needs to be replaced, without damaging the structural integrity of the stator spindle and the mounting base.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and in particular to a permanent magnet electric roller. Background Technology

[0002] Permanent magnet electric rollers have advantages such as simple structure, reliable operation, low loss, high efficiency, and direct drive control. They are particularly suitable for low-temperature, high-torque applications and are therefore widely used in industries such as petroleum, mining, and metallurgical steel rolling.

[0003] The stator of a permanent magnet electric drum consists of a stator spindle, a stator core, and stator coils. The stator core is fixed to the stator spindle, and the stator coils are wound around the stator core. The stator spindle is fixedly connected to a mounting base via a key connection to secure the stator. However, when the permanent magnet electric drum is subjected to severe impact loads, the key connection is prone to plastic deformation due to stress concentration. This can lead to irreversible bending deformation or fatigue cracks in the spindle body, ultimately requiring the entire spindle to be replaced, significantly increasing maintenance costs. Summary of the Invention

[0004] In view of this, this application provides a permanent magnet electric roller to solve the problem that when a permanent magnet electric roller is subjected to severe impact loads, the key connection part is prone to plastic deformation due to stress concentration, which leads to irreversible bending deformation or fatigue cracks in the main shaft body, ultimately requiring the entire main shaft to be replaced, significantly increasing maintenance costs.

[0005] This application provides a permanent magnet electric roller, comprising:

[0006] Mounting base with mounting through holes;

[0007] The permanent magnet electric drum body includes a stator spindle, which passes through the mounting through hole;

[0008] An expansion sleeve assembly is located between the mounting through hole and the stator spindle;

[0009] When the stator spindle and the mounting through hole have relative rotation or a tendency to rotate relative to each other, the mounting through hole generates a limiting torque through the expansion sleeve assembly to limit the rotation of the stator spindle.

[0010] Beneficial effects: When the permanent magnet electric roller is subjected to severe impact load, the expansion sleeve assembly can not only absorb the impact energy through slight deformation, but also allow the stator spindle to slide relative to the expansion sleeve assembly, converting the impact energy into heat, thereby reducing the impact on the stator spindle. In addition, even if the impact is too large and causes the expansion sleeve assembly to fail, only the expansion sleeve needs to be replaced, without damaging the structural integrity of the stator spindle and the mounting base. The expansion sleeve can be replaced separately after damage, and the disassembly process does not require damage to the structure of the shaft or hole. The replacement process is simple and quick, reducing downtime and maintenance workload.

[0011] In one optional embodiment, the expansion sleeve assembly has a first tightening force acting on the outer wall of the stator spindle and a second tightening force acting on the inner wall of the mounting through hole. When the stator spindle and the mounting through hole have relative rotation or a tendency to rotate relative to each other, the inner wall of the mounting through hole generates a second frictional torque on the expansion sleeve assembly according to the second tightening force to limit the rotation of the expansion sleeve assembly, so that the expansion sleeve assembly generates a first frictional torque on the stator spindle according to the first tightening force to limit the rotation of the stator spindle, wherein the first frictional torque is the limiting torque.

[0012] Beneficial effects: When the stator spindle and the mounting through hole have relative rotation or a tendency to rotate relative to each other, the inner wall of the mounting through hole generates a set second frictional force on the expansion sleeve assembly through a second tightening force. This second frictional force provides a second frictional torque to the expansion sleeve assembly, thereby limiting the rotation of the expansion sleeve assembly. At the same time, the expansion sleeve assembly generates a first frictional force on the stator spindle through a first tightening force. This first frictional force provides a first frictional torque to the stator spindle, thereby limiting the rotation of the stator spindle. The first tightening force and the second tightening force provide relatively large first and second frictional forces, respectively. In addition, the mounting through hole is connected to the stator spindle through the expansion sleeve assembly, which improves the stability of the permanent magnet electric roller during operation, reduces unnecessary mechanical wear, and extends the service life of the equipment.

[0013] In one alternative embodiment, the expansion sleeve assembly includes:

[0014] The annular expansion sleeve has a first annular surface and a second annular surface. The first annular surface abuts against the inner wall of the mounting through hole, and the second annular surface is sleeved on the outer periphery of the stator spindle and abuts against the stator spindle.

[0015] The first conical sleeve is located between the first annular surface and the second annular surface;

[0016] Multiple bolts are spaced apart around the axis of the annular expansion sleeve, and each bolt is threadedly connected to the first tapered sleeve.

[0017] Beneficial effects: The first annular surface of the annular expansion sleeve abuts against the inner wall of the mounting through hole, and the second annular surface abuts against the outer circumference of the stator spindle. The first tapered sleeve is located between the first and second annular surfaces. Multiple bolts are distributed at intervals along the axis and are threadedly connected to the first tapered sleeve. When each bolt is tightened, each bolt exerts radial pressure on the first tapered sleeve, causing the first tapered sleeve to expand and drive the annular expansion sleeve to expand. Thus, the tightening force of the bolts causes the annular expansion sleeve to generate a tightening force, thereby limiting the position of the stator spindle.

[0018] In one alternative embodiment, the expansion sleeve assembly further includes a second tapered sleeve located between the first annular surface and the second annular surface and spaced apart from the first tapered sleeve, wherein each bolt passes through the corresponding first tapered sleeve and is threadedly connected to the second tapered sleeve.

[0019] Beneficial effects: The combined use of the second tapered sleeve and the first tapered sleeve makes the radial compressive force generated during the bolt tightening process more balanced, effectively improving the impact resistance of the expansion sleeve assembly.

[0020] In one alternative embodiment, the mounting base has a first groove, and a mounting through hole is formed on the bottom wall of the first groove. The annular expansion sleeve and the second conical sleeve both abut against the bottom wall of the first groove.

[0021] Beneficial effect: The space between the inner wall of the first groove and the mounting through hole is the installation space of the expansion sleeve assembly. During the installation process, the expansion sleeve assembly can be inserted into the installation space.

[0022] In one alternative embodiment, the mounting base has a second groove, the bottom of which is formed by the first groove, and the bottom wall of the second groove transitions to the side wall of the first groove via an inclined surface.

[0023] Beneficial effect: During the insertion of the expansion sleeve assembly, the expansion sleeve assembly can slide into the installation space along the inclined surface, which facilitates the installation of the expansion sleeve assembly.

[0024] In one alternative embodiment, the surface hardness of the contact surfaces of the first conical sleeve, the second conical sleeve, and the annular expansion sleeve is all greater than or equal to HRC45.

[0025] Beneficial effects: The surface hardness of the contact surfaces of the first tapered sleeve, the second tapered sleeve, and the annular expansion sleeve is all greater than or equal to HRC45. This significantly improves the wear resistance of each component and effectively extends the service life of the expansion sleeve assembly. Simultaneously, the high-hardness contact surfaces reduce surface deformation when subjected to high-intensity locking forces, ensuring that the expansion sleeve assembly maintains a stable limiting torque during long-term use, thereby enhancing the overall operational reliability of the permanent magnet electric roller.

[0026] In one alternative embodiment, the yield strength of the first conical sleeve, the second conical sleeve, and the annular expansion sleeve is all greater than or equal to 800 MPa.

[0027] Beneficial effects: The high yield strength of the first tapered sleeve, the second tapered sleeve, and the annular expansion sleeve ensures that the expansion sleeve assembly has excellent structural stability when subjected to high-intensity torque and pressure, reduces plastic deformation of various components, and extends service life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the permanent magnet electric drum in this application;

[0029] Figure 2 This is a sectional view of part of the stator spindle, mounting base, and expansion sleeve assembly in this application;

[0030] Figure 3 yes Figure 2 A magnified view of a portion of circle A;

[0031] Figure 4 This is a schematic diagram of the mounting base in this application;

[0032] Figure 5 This is a cross-sectional view of the mounting base in this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Mounting base; 101. Mounting through hole; 102. First groove; 103. Second groove; 104. Angled surface;

[0035] 1. Permanent magnet electric drum body; 201. Stator spindle;

[0036] 301, Annular expansion sleeve; 3011, Outer ring; 3012, Inner ring; 302, First tapered sleeve; 303, Bolt; 304, Second tapered sleeve. Detailed Implementation

[0037] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0041] Firstly, this application provides a permanent magnet electric roller, such as Figures 1 to 5 As shown, the device includes a mounting base, a permanent magnet electric roller body, and an expansion sleeve assembly. The mounting base has a mounting through hole 101. The permanent magnet electric roller body includes a stator spindle 201, which passes through the mounting through hole 101. The expansion sleeve assembly is located between the mounting through hole 101 and the stator spindle 201. When the stator spindle 201 and the mounting through hole 101 have relative rotation or a tendency to rotate relative to each other, the mounting through hole 101 generates a limiting torque through the expansion sleeve assembly to limit the rotation of the stator spindle 201.

[0042] Specifically, the permanent magnet electric drum body includes a housing, a stator assembly, and a rotor assembly. The outer periphery of the housing is used to mount the driven components, such as pulleys or belts. The stator assembly includes a stator spindle 201, a stator core, and windings. The stator core is sleeved on the outer periphery of the stator spindle 201 and is fixedly connected to the stator spindle 201. The fixing method can be welding, snap-fitting, or integral molding. The windings are wound on the stator core. The rotor assembly includes a rotor core and permanent magnets. The rotor core is fixed to the inner sidewall of the housing, and the permanent magnets are embedded in the rotor core. The stator core, stator windings, rotor core, and permanent magnets are all located inside the housing. The housing is sleeved on the stator spindle 201, and the housing is rotatably connected to the stator spindle 201 through bearings. The permanent magnet electric drum body in this embodiment has the same working principle as permanent magnet electric drums in the art, and will not be described again here. Both ends of the stator spindle 201 extend outside the housing. Each end of the stator spindle 201 is connected to a corresponding mounting base via an expansion sleeve assembly. Two mounting bases and two expansion sleeve assemblies are provided. One mounting base and one expansion sleeve assembly are respectively provided on each side of the permanent magnet electric roller. Each mounting base is used to connect to the base to be installed, which can be a work platform or the ground. The mounting base has a mounting through hole 101, the shape of which is adapted to the shape of the stator spindle 201. In this embodiment, the cross-section of the mounting through hole 101 is circular, and the cross-section of the stator spindle 201 is also circular. Both ends of the stator spindle 201 pass through the corresponding mounting through hole 101. Each expansion sleeve assembly is disposed between the corresponding mounting base and the stator spindle 201. When the permanent magnet electric roller is subjected to severe impact load, the expansion sleeve assembly can absorb the impact energy through slight deformation, and the stator spindle 201 can slide relative to the expansion sleeve assembly, so that the impact energy is converted into heat, thereby reducing the impact on the stator spindle 201. In addition, even if the impact is too large and causes the expansion sleeve assembly to fail, only the expansion sleeve needs to be replaced. There is no need to damage the structural integrity of the stator spindle 201 and the mounting base. The expansion sleeve can be replaced separately after it is damaged, and the disassembly process does not require damage to the structure of the shaft or hole. The replacement process is simple and quick, reducing downtime and maintenance workload.

[0043] In one optional embodiment, the expansion sleeve assembly has a first tightening force acting on the outer wall of the stator spindle 201 and a second tightening force acting on the inner wall of the mounting through hole 101. When the stator spindle 201 and the mounting through hole 101 have relative rotation or a tendency to rotate relative to each other, the inner wall of the mounting through hole 101 generates a second frictional torque on the expansion sleeve assembly according to the second tightening force to limit the rotation of the expansion sleeve assembly. This causes the expansion sleeve assembly to generate a first frictional torque on the stator spindle 201 according to the first tightening force to limit the rotation of the stator spindle 201. The first frictional torque is the limiting torque. When the stator spindle 201 and the mounting through hole 101 have relative rotation or a tendency to rotate relative to each other, the inner wall of the mounting through hole 101 generates a set second frictional force on the expansion sleeve assembly through a second tightening force. This second frictional force provides a second frictional torque to the expansion sleeve assembly to limit its rotation. At the same time, the expansion sleeve assembly generates a first frictional force on the stator spindle 201 through a first tightening force. This first frictional force provides a first frictional torque to the stator spindle 201 to limit its rotation. The first tightening force and the second tightening force provide relatively large first and second frictional forces, respectively. In addition, the mounting through hole 101 is connected to the stator spindle 201 through the expansion sleeve assembly, which improves the stability of the permanent magnet electric roller during operation, reduces unnecessary mechanical wear, and extends the service life of the equipment.

[0044] In one alternative implementation, such as Figure 2 and Figure 3 As shown, the expansion sleeve assembly includes an annular expansion sleeve 301, a first tapered sleeve 302, and multiple bolts 303. The annular expansion sleeve 301 includes an outer ring 3011 and an inner ring 3012. The outer ring 3011 has a first annular surface, which is the outer ring 3011 surface. The inner ring 3012 has a second annular surface, which is the inner ring 3012 surface. The first annular surface abuts against the inner wall of the mounting through hole 101, and the second annular surface is sleeved on the outer circumference of the stator spindle 201 and abuts against the stator spindle 201. The first tapered sleeve 302 is located between the first annular surface and the second annular surface. Multiple bolts 303 are distributed at intervals around the axis of the annular expansion sleeve 301, and each bolt 303 is threadedly connected to the first tapered sleeve 302. The first annular surface of the annular expansion sleeve 301 abuts against the inner wall of the mounting through hole 101, and the second annular surface abuts against the outer circumference of the stator spindle 201. The first tapered sleeve 302 is located between the first and second annular surfaces. Multiple bolts 303 are distributed at intervals along the axis and are threadedly connected to the first tapered sleeve 302. When each bolt 303 is tightened, each bolt 303 exerts radial pressure on the first tapered sleeve 302, causing the first tapered sleeve 302 to expand and drive the annular expansion sleeve 301 to expand. Thus, the tightening force of the bolts 303 causes the annular expansion sleeve 301 to generate a tightening force, thereby limiting the stator spindle 201.

[0045] In one alternative implementation, such as Figure 3As shown, the expansion sleeve assembly also includes a second tapered sleeve 304, which is located between the first annular surface and the second annular surface and is spaced apart from the first tapered sleeve 302. Each bolt 303 passes through the corresponding first tapered sleeve 302 and is threadedly connected to the second tapered sleeve 304. The cooperation between the second tapered sleeve 304 and the first tapered sleeve 302 makes the radial compressive force generated during the bolt 303 tightening process more balanced, effectively improving the impact resistance of the expansion sleeve assembly.

[0046] Specifically, such as Figure 3 As shown, the annular hole of the outer ring 3011 includes a first hole segment, a second hole segment, and a third hole segment connected in sequence. The first hole segment and the third hole segment are located at both ends of the second hole segment. The second hole segment is a straight circular through hole, and the first hole segment and the third hole segment are both frustum-shaped holes. The first tapered sleeve 302 and the second tapered sleeve 304 are both frustum-shaped, and both the first tapered sleeve 302 and the second tapered sleeve 304 are provided with bolt 303 through holes for connection with the corresponding bolt 303. The bolt 303 is a high-strength bolt 303 to avoid the bolt 303 deforming first when the expansion sleeve assembly is subjected to a violent impact.

[0047] In one alternative implementation, such as Figure 4 and Figure 5 As shown, the mounting base has a first groove 102, and a mounting through hole 101 is formed on the bottom wall of the first groove 102. The annular expansion sleeve 301 and the second conical sleeve 304 both abut against the bottom wall of the first groove 102. The space between the inner wall of the first groove 102 and the mounting through hole 101 is the mounting space of the expansion sleeve assembly. During installation, the expansion sleeve assembly is inserted into this mounting space.

[0048] In one alternative implementation, such as Figure 4 and Figure 5 As shown, the mounting base has a second groove 103, and a first groove 102 is formed at the bottom of the second groove 103. The bottom wall of the second groove 103 and the side wall of the first groove 102 are transitioned by an inclined surface 104. During the insertion of the expansion sleeve assembly, the expansion sleeve assembly can slide into the installation space along the inclined surface 104, which facilitates the installation of the expansion sleeve assembly.

[0049] In one optional embodiment, the surface hardness of the contact surfaces of the first tapered sleeve 302, the second tapered sleeve 304, and the annular expansion sleeve 301 is all greater than or equal to HRC45. This significantly improves the wear resistance of the components and effectively extends the service life of the expansion sleeve assembly. Simultaneously, the high-hardness contact surfaces reduce surface deformation when subjected to high-intensity locking forces, ensuring that the expansion sleeve assembly maintains a stable limiting torque during long-term use, thereby enhancing the overall operational reliability of the permanent magnet electric roller.

[0050] In one optional embodiment, the yield strength of the first tapered sleeve 302, the second tapered sleeve 304, and the annular expansion sleeve 301 is all greater than or equal to 800 MPa. The high yield strength of the first tapered sleeve 302, the second tapered sleeve 304, and the annular expansion sleeve 301 ensures that the expansion sleeve assembly has excellent structural stability when subjected to high-intensity torque and pressure, reduces the occurrence of plastic deformation in various components, and extends service life.

[0051] This application discloses a keyless connection between the mounting base and the stator spindle 201 via an expansion sleeve assembly. The expansion sleeve assembly eliminates the need for high-precision keyway machining of the stator spindle 201 and the mounting through hole 101; only surface roughness needs to be ensured. During installation, self-centering is achieved by tightening the bolts 303, shortening assembly time and avoiding the complex machining, difficult installation, and easy detachment problems associated with traditional keyed connections or interference fits. The expansion sleeve assembly automatically generates a limiting torque based on the relative rotational tendency between the stator spindle 201 and the mounting through hole 101, effectively limiting the rotation of the stator spindle 201 and ensuring the stability and reliability of the connection. This design simplifies the machining process, improves installation efficiency, and features impact resistance and easy disassembly and maintenance, making it particularly suitable for heavy-duty conveying scenarios such as mines and ports.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A permanent magnet electric roller, characterized in that, include: Mounting base with mounting through hole (101); The permanent magnet electric drum body includes a stator spindle (201) through which the stator spindle (201) passes. The expansion sleeve assembly is located between the mounting through hole (101) and the stator spindle (201); When the stator spindle (201) and the mounting through hole (101) have relative rotation or relative rotation tendency, the mounting through hole (101) generates a limiting torque through the expansion sleeve assembly to limit the rotation of the stator spindle (201).

2. The permanent magnet electric roller according to claim 1, characterized in that, The expansion sleeve assembly has a first tightening force acting on the outer wall of the stator spindle (201) and a second tightening force acting on the inner wall of the mounting through hole (101). When the stator spindle (201) and the mounting through hole (101) have relative rotation or relative rotation tendency, the inner wall of the mounting through hole (101) generates a first frictional torque on the expansion sleeve assembly according to the first tightening force to limit the rotation of the expansion sleeve assembly, so that the expansion sleeve assembly generates a second frictional torque on the stator spindle (201) according to the second tightening force to limit the rotation of the stator spindle (201). The second frictional torque is the limiting torque.

3. The permanent magnet electric roller according to claim 2, characterized in that, The expansion sleeve assembly includes: The annular expansion sleeve (301) has a first annular surface and a second annular surface. The first annular surface abuts against the inner wall of the mounting through hole (101), and the second annular surface is sleeved on the outer periphery of the stator spindle (201) and abuts against the stator spindle (201). The first conical sleeve (302) is located between the first annular surface and the second annular surface; Multiple bolts (303) are spaced apart around the axis of the annular expansion sleeve (301), and each bolt (303) is threadedly connected to the first tapered sleeve (302).

4. The permanent magnet electric roller according to claim 3, characterized in that, The expansion sleeve assembly further includes a second tapered sleeve (304), which is located between the first annular surface and the second annular surface and is spaced apart from the first tapered sleeve (302). Each bolt (303) passes through the corresponding first tapered sleeve (302) and is threadedly connected to the second tapered sleeve (304).

5. The permanent magnet electric roller according to claim 4, characterized in that, The mounting base has a first groove (102), and a mounting through hole (101) is provided on the bottom wall of the first groove (102). The annular expansion sleeve (301) and the second conical sleeve (304) both abut against the bottom wall of the first groove (102).

6. The permanent magnet electric roller according to claim 5, characterized in that, The mounting base has a second groove (103), and the bottom of the second groove (103) is provided with the first groove (102). The bottom wall of the second groove (103) and the side wall of the first groove (102) are connected by an inclined surface (104).

7. The permanent magnet electric roller according to claim 4, characterized in that, The surface hardness of the contact surfaces of the first tapered sleeve (302), the second tapered sleeve (304), and the annular expansion sleeve (301) is greater than or equal to HRC45.

8. The permanent magnet electric roller according to claim 4, characterized in that, The yield strength of the first tapered sleeve (302), the second tapered sleeve (304), and the annular expansion sleeve (301) is greater than or equal to 800 MPa.

Images