A locking structure for a disc motor

Abstract

The present invention discloses a locking structure for a disc motor, comprising a bushing and a plurality of dovetail keys. The bushing is fixedly connected to the stator core disc of the disc motor, and the bushing is located near the back of the stator core disc. The back of the stator core disc has a dovetail slot corresponding to each dovetail key. The end cap of the disc motor has a flat key groove corresponding to each dovetail key. One end of each dovetail key is fixedly connected to the bushing. The dovetail slots, dovetail keys, and flat key grooves correspond one-to-one. One side of each dovetail key is located in the corresponding dovetail slot, and the other side is located in the corresponding flat key groove. The dovetail slots and flat key grooves are respectively fixedly connected to the corresponding dovetail keys. The locking structure of the disc motor of the present invention is simple in structure and easy to assemble, facilitating mass production and assembly of disc motors.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a locking structure of a disc motor. Background Art

[0002] Disc motors feature an axial magnetic field structure, offering higher power density than traditional radially distributed motors. The stator disc of a disc motor is made of wound silicon steel strip, with the stator core radially layered and naturally eccentric between the inner and outer core rings, hindering motor assembly. Furthermore, securing the stator core to the end caps (or housing) is difficult. Early disc motors used pins welded to the side of the stator disc as end caps, but this presented issues with multiple pin welding and screw hole matching, making it unsuitable for mass production. In recent years, various fixing methods have emerged, including core through-holes, threaded holes, and embedded bolts. However, core openings can affect the motor's magnetic circuit and cause fractures in the silicon steel sheets. The rigidity of the silicon steel sheets cannot meet the bolt tightening requirements, causing the motor to fail to meet its design lifespan. In summary, compared to traditional motor processes such as mass core lamination and automatic shrink-fitting of the core and housing, mass production of cores and assembly of stator cores and end caps are crucial for the mass application of disc motors. Summary of the Invention

[0003] The object of the present invention is to provide a locking structure for a disc motor to solve the problems existing in the above-mentioned prior art and facilitate the mass production and assembly of the disc motor.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a locking structure for a disc motor, comprising a bushing and a plurality of dovetail keys, wherein the bushing is fixedly connected to the stator core disk of the disc motor, and the bushing is close to the back of the stator core disk, and a dovetail groove is provided on the back of the stator core disk corresponding to each dovetail key, and a flat key groove is provided on the end cover of the disc motor corresponding to the dovetail key, one end of the dovetail key is fixedly connected to the bushing, the dovetail groove, the dovetail key and the flat key groove correspond one-to-one, one side of the dovetail key is located in the corresponding dovetail groove, and the other side is located in the corresponding flat key groove; the dovetail groove and the flat key groove are respectively fixedly connected to the corresponding dovetail key.

[0006] Preferably, a plurality of radial welding grooves are respectively provided on both sides of the dovetail groove on the back of the stator core disk.

[0007] Preferably, the bushing is coaxial with the stator core disk.

[0008] Preferably, the bushing is provided with a plurality of axial connecting holes in a circumferential direction, the connecting holes correspond one-to-one to the dovetail keys, the dovetail key is provided with a first through hole corresponding to the connecting hole, the dovetail key is fixed to the bushing by a bolt, and the bolt passes through the first through hole and the connecting hole.

[0009] Preferably, the dovetail key is further provided with a plurality of first screw holes, the flat key groove is provided with second screw holes corresponding to the first screw holes, the end cover is fixedly connected to the stator core disk by a plurality of bolts, and the bolts pass through the second screw holes and the first screw holes to be threadedly connected to the stator core disk.

[0010] Preferably, the stator core disk is made by a direct winding process of silicon steel strips, and the silicon steel strip layers are bonded and fixed during the winding process. The stator slot portion is automatically punched out during the winding process of the stator core disk to form the stator tooth portion and the stator yoke portion; the dovetail slots are automatically punched out during the winding process, and the dovetail slots are evenly distributed along the circumference.

[0011] Preferably, the silicon steel strip is wound on the bushing, and the bushing is made of steel.

[0012] Compared with the prior art, the present invention has achieved the following technical effects:

[0013] The locking structure of the disc motor of the present invention is simple in structure and easy to assemble, facilitating the mass production and assembly of disc motors. The locking structure of the disc motor of the present invention utilizes a dovetail key to open screw holes, with bolts passing through the end cap and locked with the dovetail key. This eliminates the need for through-holes in the stator core disc, preventing the stator core disc from being discontinuous due to through-holes. This prevents axial slippage of the stator core disc between adjacent screw holes, and prevents axial displacement of the stator core due to magnetic pull from the rotor permanent magnet, thereby ensuring safe operation of the motor. The stator core disc is radially welded to the radial welding groove to secure the stator core disc, making the stator core disc integral, thereby effectively preventing radial and circumferential tangential vibrations that may occur in the stator core disc during motor operation and reducing motor operating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a partial structural schematic diagram of the locking structure of the disc motor of the present invention;

[0016] Figure 2Schematic diagram of the structure of the stator core in the locking structure of the disc motor of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the bushing in the locking structure of the disc motor of the present invention;

[0018] Figure 4 Schematic diagram of the structure of the dovetail key in the locking structure of the disc motor of the present invention;

[0019] Figure 5 The structure of the end cover in the locking structure of the disc motor of the present invention is schematically shown. Figure 1 ;

[0020] Figure 6 The structure of the end cover in the locking structure of the disc motor of the present invention is schematically shown. Figure 2 ;

[0021] Among them: 1- stator core disk, 11- stator slot, 12- stator tooth, 13- stator yoke, 14- radial welding slot, 15- dovetail slot, 2- bushing, 21- connecting hole, 3- dovetail key, 31- first through hole, 32- first screw hole, 4- end cover, 41- flat key groove, 42- second screw hole, 43- flat head bolt, 44- water channel. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The object of the present invention is to provide a locking structure for a disc motor to solve the problems existing in the above-mentioned prior art and facilitate the mass production and assembly of the disc motor.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 6 As shown: the locking structure of the disc motor of this embodiment includes a bushing 2 and 10 dovetail keys 3. The bushing 2 is fixedly connected to the stator core disk 1 of the disc motor, and the bushing 2 is close to the back of the stator core disk 1. The bushing 2 is coaxial with the stator core disk 1.

[0026] The stator core disk 1 is made using a direct winding process with silicon steel strip. During the winding process, the layers of silicon steel strip are bonded and fixed together. During the winding process, stator slots 11 are automatically punched out of the stator core disk 1, forming stator teeth 12 and a stator yoke 13. Dovetail slots 15 are also automatically punched out during the winding process, and are evenly spaced along the circumference. The silicon steel strip is wound around a bushing 2, which serves as the core's positioning reference. This effectively positions the stator disk, preventing eccentricity and facilitating high-speed rotation of the motor. In this embodiment, bushing 2 is made of steel.

[0027] On both sides of each dovetail slot 15 on the back of the stator core disk 1, dovetail slots 15 are respectively provided corresponding to the dovetail key 3. The end cover 4 of the disc motor is provided with a flat key groove 41 corresponding to the dovetail key 3. One end of the dovetail key 3 is fixedly connected to the bushing 2. The bushing 2 is provided with 10 axial connecting holes 21 in the circumferential direction. The connecting holes 21 correspond one-to-one to the dovetail keys 3. The dovetail key 3 is provided with a first through hole 31 corresponding to the connecting hole 21. The dovetail key 3 is fixedly connected to the bushing 2 by a bolt, and the bolt passes through the first through hole 31 and the connecting hole 21.

[0028] The dovetail slot 15, dovetail key 3 and flat key groove 41 correspond to each other. One side of the dovetail key 3 is located in the corresponding dovetail slot 15, and the other side is located in the corresponding flat key groove 41. The dovetail key 3 also has two first screw holes 32, and the flat key groove 41 has a second screw hole 42 corresponding to the first screw hole 32. The end cover 4 is fixed to the stator core disk 1 by several bolts. The bolts pass through the second screw holes 42 and the first screw holes 32 and are threadedly connected to the stator core disk 1. The two end covers 4 are connected by flat head bolts 43. In this embodiment, the dovetail key 3 is provided with screw holes, and the bolts pass through the end cover 4 and are locked and fixed with the dovetail key 3. As a result, there are no through holes on the stator core disk 1, which prevents the through holes from causing the stator core disk 1 to have a fault and become discontinuous, thereby preventing the stator core disk 1 from axially slipping between adjacent screw holes, and preventing the stator core from axially displacing due to the magnetic pull of the rotor permanent magnet, thereby ensuring the safe operation of the motor.

[0029] The back of the stator core disk 1 is provided with a plurality of radial welding grooves 14. The stator core disk 1 is radially welded in the radial welding grooves 14 to fix the stator core disk 1 so that the stator core disk 1 becomes an integral part, thereby effectively preventing radial and circumferential tangential vibrations that may be generated by the stator core disk 1 when the motor is working, thereby reducing the operating noise of the motor.

[0030] The outer circular surface of the end cover 4 can be provided with a water channel 44 of any shape. The end cover combines the water channel 44 and is provided with a matching circular cover plate. The circular cover plate is fastened to the end cover by bolts to form a sealed water channel. The through hole of the end cover 4 is set in the end cover water channel. There is no need to set a frustum protrusion as a water channel seal. Instead, a flat head bolt with a sealing ring (or other sealing material) is used to fasten the motor end cover and the dovetail key, which effectively reduces the water resistance of the water channel.

[0031] In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0032] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A locking structure for a disc motor, characterized in that: The present invention comprises a bushing and a plurality of dovetail keys, wherein the bushing is fixedly connected to the stator core disk of the disc motor, and the bushing is close to the back of the stator core disk, and a dovetail slot is provided on the back of the stator core disk corresponding to each dovetail key, and a flat key slot is provided on the end cover of the disc motor corresponding to the dovetail key, one end of the dovetail key is fixedly connected to the bushing, and the dovetail slot, the dovetail key and the flat key slot correspond one to one, one side of the dovetail key is located in the corresponding dovetail slot, and the other side is located in the corresponding flat key slot; the dovetail slot and the flat key slot are respectively fixedly connected to the corresponding dovetail key; the stator core disk Several radial welding grooves are respectively provided on both sides of the dovetail groove on the back; several first screw holes are also provided on the dovetail key, and a second screw hole is provided on the flat key groove corresponding to the first screw hole. Several bolts of the end cover are fixed to the stator core disk, and the bolts pass through the second screw holes and the first screw holes and are threadedly connected to the stator core disk; several axial connecting holes are provided in the circumference of the bushing, and the connecting holes correspond one-to-one to the dovetail keys, and the dovetail key has a first through hole corresponding to the connecting hole, and the dovetail key is fixed to the bushing by bolts, and the bolts pass through the first through hole and the connecting hole.

2. The locking structure of the disc motor according to claim 1, characterized in that: The bushing is coaxial with the stator core disk.

3. The locking structure of the disc motor according to claim 1, characterized in that: The stator core disk is made by a direct winding process of silicon steel strips. During the winding process, the silicon steel strip layers are bonded and fixed. During the winding process of the stator core disk, stator slots are automatically punched out to form stator teeth and stator yokes. The dovetail slots are automatically punched out during the winding process, and the dovetail slots are evenly distributed along the circumference.

4. The locking structure of the disc motor according to claim 3, characterized in that: The silicon steel strip is wound on the bushing, and the bushing is made of steel.

Images