Riveting type variable frequency rotor structure

Abstract

The utility model discloses a riveting type frequency conversion rotor structure, which comprises a laminated core and a threaded fastener, two end faces of the laminated core are respectively provided with a positioning flange, the outer end face of each positioning flange is provided with a balance block, the laminated core is provided with a plurality of first connecting holes, the positioning flanges are provided with second connecting holes, and the first connecting holes are connected with the second connecting holes. The balance block is provided with a third connecting hole, the position of the third connecting hole is matched with the first connecting hole and the second connecting hole to install a threaded fastener, the threaded fastener comprises a screw part and a hollow riveting part integrally arranged at the tail end of the screw part, and an internal thread is arranged in the second connecting hole or the third connecting hole and corresponds to the threaded section of the screw part; the device has the advantages of being convenient to manufacture, simple in structure and stable in performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor rotors, and in particular relates to a riveted variable frequency rotor structure. Background Art

[0002] The motor rotor is the rotating part of the motor. The motor consists of two parts: the rotor and the stator. It is a device used to realize the conversion of electrical energy into mechanical energy.

[0003] The rotor of a brushless DC motor is composed of permanent magnets with a certain number of pole pairs embedded on the surface of the iron core or embedded inside the iron core. Permanent magnets are mostly made of rare earth permanent magnet materials with high coercivity and high permeability magnetic induction density such as neodymium iron boron. The role of the permanent magnets in this rotor is similar to that of the permanent magnets used in brushed motors, both of which establish a sufficient magnetic field in the air gap of the motor. The difference is that the permanent magnets in the brushless DC motor are installed on the rotor, while the magnets in the brushed motor are installed on the stator. The rotor structure of a brushless DC motor mostly uses surface-bonded magnetic poles, also known as tile-shaped magnetic poles. Surface-bonded magnetic poles are radially magnetized tile-shaped rare earth permanent magnets bonded to the outer surface of the iron core. Reasonable design can obtain square wave air gap flux density.

[0004] The motor rotor lamination group refers to the way the iron core in the motor rotor is composed. In the motor rotor, the lamination group is composed of multiple thin iron sheets stacked to form an integral iron core structure.

[0005] The problem with the prior art is that the motor rotor lamination group is usually fastened by casting end ring structures on both sides, and the casting manufacturing process is complicated and the production efficiency is low; for the installation of the rotor balance block, it is usually necessary to set fasteners separately, and the structure is relatively complicated; some motor rotor laminations are fixed by passing rivets through the rivet holes of the core and riveting with pressure equipment. In this way, the rivet rod part is easily bent and deformed, affecting the dimensional accuracy and working performance of the rotor core. Summary of the invention

[0006] The utility model aims to solve the problems existing in the prior art and provide a riveted variable frequency rotor structure, which has the advantages of convenient manufacturing, simple structure and stable performance.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a riveted variable frequency rotor structure, including a laminated core and a threaded fastener, the two end surfaces of the laminated core are respectively provided with positioning flanges, the outer end surface of the positioning flange is provided with a balancing block, the laminated core is provided with a plurality of connecting holes one, the positioning flange is provided with a connecting hole two, the balancing block is provided with a connecting hole three, the position of the connecting hole three matches the connecting hole one and the connecting hole two to install the threaded fastener, the threaded fastener includes a screw portion and a hollow riveted portion integrally provided at the tail end of the screw portion, and the connecting hole two or the connecting hole three is provided with an internal thread corresponding to the threaded section of the screw portion.

[0008] In the above scheme, the positioning flanges at both ends are used to clamp and position the laminated core in the middle, and the balancing block is used to maintain the balance of the rotor under high-speed rotation. The connection hole one on the laminated core, the connection hole two of the positioning flange and the connection hole three on the balancing block are opened at corresponding positions for threaded fasteners to pass through. The positioning flanges and the balancing block on both sides are screwed together to clamp and fix the inner laminated core. After the screwing and clamping, the hollow riveting part is used to prevent the threaded fasteners from loosening, thereby ensuring the stability of the structure. Due to the screwing of the threaded section, it can bear the axial pressure during riveting, thereby avoiding the deformation of the middle section of the threaded fastener under stress.

[0009] Furthermore, the hollow riveted portion comprises a cylindrical structure before riveting, and a central hole is opened at the central axis of the cylindrical structure.

[0010] The hollow riveted part is a cylindrical structure before riveting. The diameter of the cylindrical structure does not exceed the diameter of the connection hole one, the connection hole two, and the connection hole three, which is convenient for passing. The central hole is opened to facilitate the cylindrical structure to deform under stress to achieve riveting, thereby reducing the axial pressure during riveting.

[0011] Furthermore, the cylindrical structure is provided with strip grooves in the axial direction, and a plurality of strip grooves are provided at equal intervals in the circumferential direction of the cylindrical structure.

[0012] The strip grooves are provided to facilitate the deformation of the cylindrical structure during riveting, thereby reducing the axial pressure of the riveting and simplifying the structure.

[0013] Furthermore, the laminated core includes a plurality of steel sheet units, and a snap-fit ​​positioning structure 1 is arranged between the steel sheet units.

[0014] The laminated core is formed by stacking steel sheet units, which is easy to manufacture. The relative positions of the steel sheet units are ensured by a snap-fit ​​positioning structure, thereby improving the working efficiency of the rotor.

[0015] Furthermore, a second snap-fit ​​positioning structure is provided between the positioning flange and the steel sheet unit, and the positioning flange has the same outer contour shape as the steel sheet unit.

[0016] The positioning accuracy between the positioning flange and the steel sheet unit is ensured by the second snap-fit ​​positioning structure.

[0017] Furthermore, ventilation holes are equidistantly formed on the laminated core along the peripheral direction, and the connection holes are equidistantly formed along the peripheral direction of the laminated core.

[0018] The vent hole penetrates the laminated core to improve the ventilation and heat dissipation performance inside the laminated core, and the connection hole 1 is staggered with the vent hole.

[0019] Furthermore, crankshaft holes are provided in the middle of the laminated core and the positioning flange, and the cross-sections of the laminated core and the positioning flange are both circular.

[0020] The crankshaft hole is used to install the crankshaft, and the crankshaft hole size of the positioning flange can be larger than the crankshaft hole size of the laminated core.

[0021] Furthermore, the balancing block is a fan-shaped structure, and in a top-down view, the projections of the two balancing blocks are arranged relative to each other.

[0022] The balancing blocks are relatively arranged on the projection plane to ensure the balancing performance of the rotor.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. By opening corresponding connection holes on the laminated core, the positioning flange and the balancing block, the threaded section of the threaded fastener is screwed with the positioning flange or the balancing block at the tail, the axial compression and fixation of each component is performed, and then the rivet locking of the hollow rivet part at the tail is performed. The assembly production is convenient to manufacture, has high production efficiency and simple structure;

[0025] 2. Threaded fasteners use threaded structures to avoid the concentration of riveting pressure in the middle of the screw, which causes rivet deformation and affects the positioning of the rotor laminations. The threaded fasteners also use threaded joints to prevent the threaded structure from loosening, thus ensuring the stability of the rotor structure and performance.

[0026] 3. By setting the riveted part to be hollow and providing strip grooves, the riveted part is facilitated to be deformed under pressure, the riveting pressure on the fasteners and the iron core is reduced, and a snap-fit ​​positioning structure is provided between the steel sheet units to ensure the dimensional accuracy and performance of the rotor iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural stereogram of a riveted variable frequency rotor structure of Example 1 of the utility model;

[0028] Figure 2 This is a schematic diagram of the installation of a cylindrical structure before riveting in Example 1 of the utility model;

[0029] Figure 3 It is a cross-sectional view of the installation of the threaded fastener in Embodiment 1 of the present utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the strip groove in Example 2 of the utility model;

[0031] Figure 5 This is a schematic structural diagram of the positioning protrusion and the positioning groove in Example 2 of the utility model;

[0032] In the figure: 1. Steel sheet unit; 2. Positioning flange; 3. Balance block; 4. Connection hole one; 5. Connection hole two; 6. Connection hole three; 7. Screw part; 8. Hollow riveting part; 9. Cylindrical structure; 10. Center hole; 11. Strip groove; 12. Vent hole; 13. Crankshaft hole; 14. Positioning protrusion; 15. Positioning groove. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative labor are within the scope of protection of the utility model. In the description of the utility model, it should be noted that the terms front, back, left, right, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships in which the utility model product is usually placed when used. They are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0034] Example 1

[0035] like Figure 1-3 As shown, a riveted variable frequency rotor structure includes a laminated core and a threaded fastener, wherein positioning flanges 2 are respectively provided on both end surfaces of the laminated core, a balancing block 3 is provided on the outer end surface of the positioning flange 2, a plurality of connecting holes 1 4 are provided on the laminated core, a connecting hole 2 5 is provided on the positioning flange 2, a connecting hole 3 6 is provided on the balancing block 3, the positions of the connecting holes 3 6 match the connecting holes 1 4 and the connecting holes 2 5 to install the threaded fastener, the threaded fastener includes a screw portion 7 and a hollow riveted portion 8 integrally provided at the rear end of the screw portion 7, and an internal thread is provided in the connecting hole 2 5 or the connecting hole 3 6 corresponding to the threaded section of the screw portion 7.

[0036] In the above scheme, the positioning flanges 2 at both ends are used to clamp and position the middle laminated core, and the balancing block 3 is used to maintain the balance of the rotor under high-speed rotation. The connection hole 1 4 on the laminated core, the connection hole 2 5 of the positioning flange 2 and the connection hole 3 6 on the balancing block 3 are correspondingly opened for threaded fasteners to pass through. The positioning flanges 2 and the balancing block 3 on both sides are screwed together to clamp and fix the inner laminated core. After the screwing and clamping, the hollow riveting part 8 is used to prevent the threaded fasteners from loosening, thereby ensuring the stability of the structure. Due to the screwing of the threaded section, it can bear the axial pressure during riveting, thereby avoiding the deformation of the middle section of the threaded fastener under stress.

[0037] During riveting, see Figure 3 Installation cross-sectional view of threaded fasteners. During riveting, a hollow riveted portion 8 is formed by applying axial pressure to the tail end of the threaded fastener. The hollow riveted portion 8 is used to press and fit the positioning flange 2 or the balancing block 3 to achieve position limiting and anti-loosening. The diameter of the hollow riveted portion 8 is larger than the diameter of the corresponding connecting hole 2 5 or connecting hole 3 6. The threaded section is located on one side of the tail end of the screw part 7, and the connecting hole 2 5 or connecting hole 3 6 of the corresponding threaded section is provided with an internal thread corresponding to the threaded section of the screw part 7. The positioning flange 2 and the balancing block 3 can be set as an integrated structure as needed.

[0038] Furthermore, the hollow riveted portion 8 comprises a cylindrical structure 9 before riveting, and a central hole 10 is opened at the central axis of the cylindrical structure 9 .

[0039] The hollow riveted part 8 is a cylindrical structure 9 before riveting. The diameter of the cylindrical structure 9 does not exceed the diameter of the connecting hole 1 4, the connecting hole 2 5, and the connecting hole 3 6, which is convenient for passing. The central hole 10 is provided to facilitate the cylindrical structure 9 to be deformed by force to achieve riveting, thereby reducing the axial pressure during riveting.

[0040] A structural hole corresponding to the central hole 10 is formed in the middle of the hollow riveted portion 8 .

[0041] Furthermore, the laminated core includes a plurality of steel sheet units 1 .

[0042] The laminated core is formed by stacking the steel sheet units 1, which is convenient to manufacture.

[0043] Furthermore, a crankshaft hole 13 is opened in the middle of the laminated core and the positioning flange 2, and the cross-sections of the laminated core and the positioning flange 2 are both circular.

[0044] The crankshaft hole 13 is used to install the crankshaft, and the size of the crankshaft hole 13 of the positioning flange 2 can be larger than the size of the crankshaft hole 13 of the laminated core.

[0045] Furthermore, the balancing weight 3 is a fan-shaped structure, and in a top view, the projections of the two balancing weights 3 are arranged opposite to each other.

[0046] The balancing blocks 3 are arranged relatively on the projection plane to ensure the balancing performance of the rotor.

[0047] Furthermore, the laminated core is provided with vent holes 12 at equal intervals along the peripheral direction, and the connecting holes 4 are provided at equal intervals along the peripheral direction of the laminated core.

[0048] The vent hole 12 passes through the laminated core to improve the ventilation and heat dissipation performance inside the laminated core, and the connection hole 4 and the vent hole 12 are staggered in position.

[0049] The balancing block 3 may be provided with ventilation holes 12 corresponding to the laminated core.

[0050] Example 2

[0051] like Figure 4-5 As shown, a riveted variable frequency rotor structure in this embodiment is further modified as follows on the basis of Embodiment 1:

[0052] Furthermore, a strip groove 11 is provided on the cylindrical structure 9 along the axial direction, and a plurality of strip grooves 11 are provided at equal intervals along the circumferential direction of the cylindrical structure 9 .

[0053] The strip grooves 11 are provided to facilitate the deformation of the cylindrical structure 9 during riveting, thereby reducing the axial pressure of riveting and simplifying the structure.

[0054] Four strip-shaped grooves 11 are arranged along the outer circle of the cylindrical structure 9 .

[0055] Furthermore, a snap-fit ​​positioning structure 1 is provided between the steel sheet units 1 .

[0056] The relative position between the steel sheet units 1 is ensured by the snap-fit ​​positioning structure 1, thereby improving the working efficiency of the rotor.

[0057] The first engaging positioning structure comprises a positioning protrusion 14 on one side of the steel sheet unit 1 and a positioning groove 15 on the other side. The positioning protrusion 14 is hemispherical and can be arranged in plurality along the circumferential direction.

[0058] Furthermore, a second snap-fit ​​positioning structure is provided between the positioning flange 2 and the steel sheet unit 1 , and the positioning flange 2 has the same outer contour shape as the steel sheet unit 1 .

[0059] The positioning accuracy between the positioning flange 2 and the steel sheet unit 1 is ensured by the second snap-fit ​​positioning structure.

[0060] The second engaging and positioning structure includes a positioning protrusion 14 provided on one positioning flange 2 and a positioning groove 15 provided on the other positioning flange 2 .

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A riveted variable frequency rotor structure, characterized in that: It includes a laminated iron core and a threaded fastener, wherein both end surfaces of the laminated iron core are respectively provided with positioning flanges, and the outer end surface of the positioning flange is provided with a balancing block, the laminated iron core is provided with a plurality of connecting holes 1, the positioning flange is provided with a connecting hole 2, and the balancing block is provided with a connecting hole 3, and the position of the connecting hole 3 matches the connecting hole 1 and the connecting hole 2 to install the threaded fastener, and the threaded fastener includes a screw portion and a hollow rivet portion integrally provided at the rear end of the screw portion, and an internal thread is provided in the connecting hole 2 or the connecting hole 3 corresponding to the threaded section of the screw portion.

2. The riveted variable frequency rotor structure according to claim 1 is characterized in that: The hollow riveting part comprises a cylindrical structure before riveting, and a central hole is opened at the central axis of the cylindrical structure.

3. The riveted variable frequency rotor structure according to claim 2 is characterized in that: The cylindrical structure is provided with strip grooves in the axial direction, and a plurality of strip grooves are provided in an equidistant manner in the circumferential direction of the cylindrical structure.

4. The riveted variable frequency rotor structure according to claim 1, characterized in that: The laminated core comprises a plurality of steel sheet units, and a first snap-fit ​​positioning structure is arranged between the steel sheet units.

5. The riveted variable frequency rotor structure according to claim 4 is characterized in that: A second engaging positioning structure is provided between the positioning flange and the steel sheet unit, and the positioning flange is consistent with the outer contour shape of the steel sheet unit.

6. The riveted variable frequency rotor structure according to claim 1, characterized in that: The laminated core is provided with vent holes at equal intervals along the peripheral direction, and the connection holes are provided at equal intervals along the peripheral direction of the laminated core.

7. The riveted variable frequency rotor structure according to claim 1, characterized in that: A crankshaft hole is provided in the middle of the laminated core and the positioning flange, and the cross sections of the laminated core and the positioning flange are both circular.

8. The riveted variable frequency rotor structure according to claim 1, characterized in that: The balancing block is a fan-shaped structure, and in a top view, the projections of the two balancing blocks are arranged opposite to each other.

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