Bearing-free motor rotor fixing structure

Abstract

The utility model relates to the technical field of motors, in particular to a bearingless motor rotor fixing structure, which comprises a rotor, a stator, an end cover and a rotor support used for supporting the rotor. A positioning stop block and a fixing block are arranged on the motor; the positioning stop block is arranged between the axial distance between the end cover and the rotor bracket; the fixing blocks are installed on the inner side face of the motor end cover and the inner side face of the rotor support. According to the bearing-free motor rotor fixing structure provided by the utility model, the motor is fixed in the radial direction and the axial direction, the axial relative positions of the stator and the rotor of the motor are ensured, the radial air gaps of the stator and the rotor are ensured to be uniform, the problem of air gap deviation in the transportation process of the motor is ensured not to occur, and meanwhile, the motor can be dispatched and installed more conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically, to a bearingless motor rotor fixing structure. Background Art

[0002] Currently, the assembly process for bearingless motors requires first assembling the motor onto a drive shaft, which then drives the motor's rotor. Because the motor's rotor is a permanent magnet with a strong magnetic surface, and the motor itself lacks bearings for support and positioning, the stator and rotor must be assembled simultaneously when the drive shaft is installed, and the air gap between them must also be uniform. Existing motor structures make it difficult to ensure a uniform air gap between the assembled stator and rotor, nor can they guarantee the relative position between the end cap and the rotor. Furthermore, vibration during motor transportation and assembly can easily lead to air gap deviations or stator-rotor friction.

[0003] Existing patent application number CN202311620972.6 discloses a through-shaft permanent magnet motor structure with a single-flange rotor and a transport tooling, including an intermediate shaft, a motor base and a motor end cover structure, wherein the intermediate shaft is respectively connected to a rotor left support ring and a rotor right support ring, and a motor rotor is arranged in the motor base, wherein a cylindrical rotor yoke is arranged in the motor rotor, and evenly distributed magnetic steel blocks are arranged on the cylindrical rotor yoke, and the motor rotor adopts a single-flange cylindrical structure with short cylinders extending from both ends. The motor rotor disclosed in this invention adopts a single-flange cylindrical structure with short cylinders extending from both ends, forming an annular gap between the motor end cover structure and the inner circle, forming an indirect air gap, and evenly inserting L-shaped gaskets into the annular gap, thereby keeping the gap between the stator and rotor of the motor unchanged during transportation. However, since the motor rotor is a permanent magnet rotor with strong magnetism on its surface, and the motor itself has no bearings for support and positioning, during transportation of the motor, the L-shaped gasket cannot achieve the effect of axial alignment of the stator and rotor, nor can it ensure uniform radial air gap of the rotor. When assembling the stator and rotor, the stator and rotor cannot be accurately assembled. During installation and transportation, it is difficult to ensure that the air gap between the rotor and the end cover remains uniform, resulting in problems such as difficulty in assembly and transportation. Utility Model Content

[0004] In order to overcome the above difficulties, the utility model discloses a bearingless motor rotor fixing structure. The utility model designs two fixing devices to ensure that the stator and rotor do not attract each other when the motor is installed. While positioning the relative axial positions of the stator and rotor, the radial air gap of the stator and rotor can be made uniform, thereby achieving better protection for the motor during storage, shipment and installation after manufacturing, and ensuring that the transportation and installation of the motor are more convenient.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] A bearingless motor rotor fixing structure, the motor includes a rotor, a stator, an end cover, and a rotor bracket for supporting the rotor; the motor is provided with a positioning stop block and a fixing block; the positioning stop block is arranged between the axial distance between the end cover and the rotor bracket, and the fixing block is installed on the inner side surface of the motor end cover and the inner circle of the rotor bracket.

[0007] Furthermore, the positioning stop block is fixed in the gap between the end cover and the rotor bracket by a bolt installed on the side of the end cover.

[0008] Furthermore, one side of the fixing block is fixedly mounted on the inner side of the end cover, and the other side of the fixing block is pressed on the inner circle of the rotor bracket.

[0009] Furthermore, the fixing blocks are provided in plurality, and at least one pair of the fixing blocks are symmetrically mounted on the end cover and the inner circle of the rotor bracket.

[0010] Furthermore, the fixing block is fixed by bolt 1, and bolt 2 fixes one side of the fixing block to the inner side of the end cover, while the other side of the fixing block presses against the inner side of the rotor bracket. Alternatively, one side of the fixing block is fixed to the inner side of the rotor bracket by bolt 2, while the other side of the fixing block presses against the inner side of the end cover.

[0011] Furthermore, screw holes are provided on the side of the end cap and the side of the rotor support, and a through hole is provided on the positioning stop. Bolt 1 passes through the screw hole on the side of the end cap and the through hole on the positioning stop, and connects to the screw hole on the side of the rotor support. Applying torque to bolt 1 tightens the end cap and the rotor support, causing the positioning stop to generate friction between the end cap and the rotor support.

[0012] Furthermore, there are a plurality of positioning stop blocks, and at least one pair of positioning stop blocks is symmetrically installed between the end cover and the axial distance of the rotor.

[0013] Furthermore, the motor rotor bracket adopts a split-petal structure, and the stator, rotor, and rotor bracket are all composed of at least two petals, which are assembled and spliced to form a full circle.

[0014] Furthermore, one end of the motor end cover is mounted on the motor base and fixedly connected to the motor stator.

[0015] Furthermore, the motor end cover adopts a multi-petal structure and is connected into a whole circle by bolts or flanges.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. A positioning stop block is designed in the gap between the end face of the motor end cover and the end face of the rotor bracket to locate and tighten the distance between the rotor and the end cover; and a fixing block is designed between the inner side of the motor end cover and the inner side of the rotor bracket to fix the rotor position, so as to fix the air gap between the stator and the rotor and ensure that the stator and rotor do not attract each other.

[0018] 2. By designing the two structures of positioning stop block and fixed block, it can effectively solve the problem of the stator and rotor being unable to be positioned, installation and shipment difficulties caused by the suction of the rotor itself during storage, shipment and installation of bearingless motors. It plays a protective role in the manufacturing, shipment and installation of bearingless motors.

[0019] 3. By designing two fixing devices, a positioning stop block and a fixing block, it can be ensured that the bearingless motor permanent magnet rotor can be safely assembled on the motor stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation of the positioning stop block and the fixed block on the motor structure;

[0021] Figure 2 This is a schematic diagram of the overall structure of the motor of the present utility model.

[0022] In the diagram: 1. Rotor bracket; 2. End cover; 3. Bolt 2; 4. Positioning stop block; 5. Fixing block; 6. Bolt 1; 7. Rotor; 8. Stator. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of the application scheme of the utility model, the utility model is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0025] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0028] Example 1

[0029] like Figure 1 and Figure 2As shown, a bearingless motor rotor fixing structure is provided. The bearingless motor includes a rotor 7, a stator 8, a motor end cover 2 and a rotor bracket 1 for supporting the rotor 7; the motor is provided with a positioning stop block 4 and a fixing block 5; the positioning stop block 4 is provided between the axial distance between the motor end cover 2 and the rotor bracket 1, and the fixing block 5 is installed on the inner side surface of the motor end cover 2 and the inner side surface of the motor rotor bracket 1; the motor end cover 2 is installed on the motor base and forms a whole with the motor stator 8, and the rotor 7 is provided on the rotor bracket 1, and the two form a whole, and the rotor 7 is supported by the rotor bracket 1.

[0030] In this embodiment, a plurality of positioning stop blocks 4 are provided on the motor. The positioning stop blocks 4 are installed between the axial distance between the motor rotor bracket 1 and the motor end cover 2 and are installed symmetrically. The positioning stop blocks 4 are firmly fixed by bolts 6. After the positioning stop blocks 4 are fixed and tightened by bolts 6, the positioning is performed by relying on the thickness of the positioning stop blocks 4 themselves, so that the axial dimension between the motor end cover 2 and the rotor 7 is kept constant, thereby achieving the effect of axial alignment of the motor stator 8 and the rotor 7, and at the same time ensuring that the motor rotor 7 does not move in the axial direction, thereby achieving the effect of axial fixation.

[0031] One side of the fixing block 5 is mounted on the inner side of the motor end cover 2. The fixing block 5 is symmetrically mounted on the inner side of the motor end cover 2 by bolts 2 (3), so that the other side of the fixing block 5 presses against the motor rotor bracket 1. After the fixing block 5 is symmetrically fixed and tightened by bolts 2 (3), a certain air gap is maintained between the rotor 7 and the stator 8. At the same time, the accuracy of the air gap between the stator and the rotor is maintained by the flatness of the fixing block 5 itself. In this embodiment, while positioning the stator 8 and the rotor 7 relative to each other in the axial direction, a specific distance is also maintained between the stator and the rotor. This achieves better protection for the motor during storage, shipment, and installation after manufacturing, and also makes the shipment and installation of the bearingless motor more convenient and faster.

[0032] In this embodiment, six fixing blocks 5 are provided. Based on the operating position of the motor, one is provided on each side, and they are symmetrically positioned about the center of the rotor 7. Three fixing blocks 5 are provided on the upper side, and one is provided on the lower side. The fixing block 5 in the middle position on the upper side is symmetrical to the fixing block 5 on the lower side about the center of the rotor 7. Of the three fixing blocks 5 on the upper side, two are symmetrically positioned about the axis.

[0033] In this embodiment, six positioning stoppers 4 are provided. Based on the operating position of the motor, one is provided on each side, and they are symmetrically arranged around the center of the rotor 7. Three are provided on the upper side, and one is provided on the lower side. The upper middle positioning stopper 4 is symmetrical to the lower positioning stopper 4 around the center of the rotor 7. Of the three upper positioning stoppers 4, the two on either side are symmetrically arranged around the axis.

[0034] In other embodiments, four positioning stop blocks 4 and four fixing blocks 5 are provided, and any two of them are axially symmetrical.

[0035] Example 2

[0036] like Figure 1 As shown, a bearingless motor rotor fixing structure is provided. The bearingless motor includes a rotor 7, a stator 8, a motor end cover 2 and a rotor bracket 1 for supporting the rotor 7; the motor is provided with a positioning stop block 4 and a fixing block 5; the positioning stop block 4 is provided between the axial distance between the motor end cover 2 and the rotor bracket 1, and the fixing block 5 is installed on the inner side surface of the motor end cover 2 and the inner side surface of the motor rotor bracket 1; the motor end cover 2 is installed on the motor base and forms a whole with the motor stator 8, and the rotor 7 is provided on the rotor bracket 1, and the two form a whole, and the rotor 7 is supported by the rotor bracket 1.

[0037] In this embodiment, fixing block 5 must first be securely fastened with bolts 2 (3), followed by securing stop block 4 with bolts 1 (6). Torque is then applied to bolts 2 (3) to uniformly adjust the air gap between the stator and rotor. Finally, torque is applied to bolts 1 (6), tightening end cover 2 and rotor bracket 1. This creates friction between stop block 4 and end cover 2, tightening rotor 7 and motor end cover 2. Installing fixing block 5 and stop block 4 between the rotor bracket 1 and motor end cover 2 of a bearingless motor maintains axial and radial positioning of the stator and rotor, maintaining a certain protective gap.

[0038] Example 3

[0039] like Figure 1 and Figure 2 As shown, a bearingless motor rotor fixing structure is provided. The bearingless motor includes a rotor 7, a stator 8, a motor end cover 2 and a rotor bracket 1 for supporting the rotor 7; the motor is provided with a positioning stop block 4 and a fixing block 5; the positioning stop block 4 is provided between the axial distance between the motor end cover 2 and the rotor bracket 1, and the fixing block 5 is installed on the inner side surface of the motor end cover 2 and the inner side surface of the motor rotor bracket 1; the motor end cover 2 is installed on the motor base and forms a whole with the motor stator 8, and the rotor 7 is provided on the rotor bracket 1, and the two form a whole, and the rotor 7 is supported by the rotor bracket 1.

[0040] In this embodiment, the motor rotor bracket 1 adopts a split-petal structure, with the stator, rotor, and rotor bracket each consisting of at least two petals, which are assembled together to form a complete circle. The rotor bracket 1 adopts a split-petal structure, which is assembled into a complete circle using mounting plates and bolts. It can also be divided into multiple petals, with the split mounting plates designed on the inner or outer circle of the bracket.

[0041] One end of the motor end cover 2 is mounted on the motor base and fixedly connected to the motor stator 8. The motor end cover 2 adopts a multi-petal structure, connected by bolts or flanges to form a complete circle. To achieve the connection of the upper and lower halves or more petals into one structure while maintaining the same assembly tolerance as the entire base, the motor end cover 2 is connected by a flange plate. The motor end cover 2 uses high-strength bolts and special lock washers to fasten the upper and lower petals. To ensure the consistency of the positioning of the upper and lower petals after repeated disassembly and installation, the motor end cover 2 can be provided with a diagonally twisted positioning pin structure.

[0042] The same or similar numbers in the accompanying drawings correspond to the same or similar parts; the positional relationships described in the accompanying drawings are for illustrative purposes only and should not be construed as limitations on this patent. Obviously, the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A bearingless motor rotor fixing structure, characterized in that: The motor includes a rotor, a stator, an end cover, and a rotor bracket for supporting the rotor; the motor is provided with a positioning stop block and a fixing block; the positioning stop block is arranged between the axial distance of the end cover and the rotor bracket; the fixing block is installed on the inner side surface of the motor end cover and the inner circle of the rotor bracket.

2. The bearingless motor rotor fixing structure according to claim 1, characterized in that: The positioning stop block is fixed in the gap between the end cover and the rotor bracket by a bolt installed on the side of the end cover.

3. The bearingless motor rotor fixing structure according to claim 1, characterized in that: One side of the fixing block is fixedly mounted on the inner side of the end cover, and the other side of the fixing block is pressed on the inner circle of the rotor bracket.

4. The bearingless motor rotor fixing structure according to claim 3, characterized in that: There are multiple fixing blocks, and at least one pair of the fixing blocks are symmetrically installed on the end cover and the inner circle of the rotor bracket.

5. The bearingless motor rotor fixing structure according to claim 3, characterized in that: The fixing block is fixed by bolt 2, and the bolt 2 fixes one side of the fixing block to the inner side surface of the end cover, and the other side of the fixing block is pressed against the inner side surface of the rotor bracket.

6. The bearingless motor rotor fixing structure according to claim 2, characterized in that: The side surfaces of the end cover and the rotor support are provided with screw holes, the positioning stop block is provided with a through hole, and the bolt passes through the screw holes on the side surfaces of the end cover and the through holes on the positioning stop block to connect with the screw holes on the side surfaces of the rotor support.

7. The bearingless motor rotor fixing structure according to claim 6, characterized in that: There are multiple positioning stop blocks, and at least one pair of positioning stop blocks is symmetrically installed between the end cover and the axial distance of the rotor bracket.

8. The bearingless motor rotor fixing structure according to claim 1, characterized in that: The motor rotor bracket adopts a split-petal structure, and the stator, rotor, and rotor bracket are all composed of at least two petals, which are assembled and spliced to form a full circle.

9. The bearingless motor rotor fixing structure according to claim 1, characterized in that: One end of the motor end cover is mounted on the motor base and is fixedly connected to the motor stator.

10. The bearingless motor rotor fixing structure according to claim 1, characterized in that: The motor end cover adopts a multi-petal structure and is connected into a whole circle by bolts or flanges.

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