Stator mounting device
By setting a stop structure between the stator frame and the intermediate plate, the problem of uncertain axial position during the cooling process of the stator core is solved, and the precise positioning and stable installation of the stator core are achieved.
Patent Information
- Application Number
- CN202510649394.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-05-24
- Filing Date
- 2025-05-20
- Publication Date
- 2025-11-25
AI Technical Summary
In the prior art, the axial position of the stator core is uncertain during the cooling process, resulting in excessive and/or asymmetrical stress, causing problems such as excessive wear and vibration.
A stop structure is installed between the stator frame and the intermediate plate. The movement of the stator core in the axial direction is restricted by the cooperation of the stop component with the stator frame and the intermediate plate, so as to ensure its correct position.
The use of a stop mechanism ensures that the stator core maintains the correct axial position during cooling, avoiding excessive wear and vibration, and improving installation accuracy and stability.
Smart Images
Figure CN121012231A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a mounting device for an electric motor stator and a method for mounting the stator. Background Technology
[0002] In existing motor devices, the stator core (see...) Figure 1 and Figure 2 The stator core is mounted on the stator frame. The stator core can be assembled using a so-called "cold shrink fit," in which the core is heated, inserted into the frame, and kept cool, causing the core to shrink and be pressed against the frame. The inventors discovered many problems with prior art devices.
[0003] The cooling process of the stator core can be unpredictable, for example, due to different cooling or variable geometry of the stator core. As the stator core cools, its axial position within the frame can change. Other aspects of the manufacturing process can also cause axial variations in position, such as manufacturing tolerances in the machining or welding of the stator core, frame, rotor core, rotor position, and / or frame. This can cause excessive and / or asymmetrical stresses as the stator core attempts to align itself with the frame and / or the rotor mounted within it. This can lead to excessive wear, vibration, or other operational problems.
[0004] The present invention aims to overcome or improve one or more of the problems mentioned above, and in particular to help ensure correct axial positioning. Summary of the Invention
[0005] According to a first aspect of the invention, an electric motor is provided, the electric motor comprising: a stator core extending axially and supported by a stator frame; an intermediate plate disposed between the stator core and the stator frame and configured to support the stator core; wherein one of the stator frame and the intermediate plate includes a stop structure configured to abut the other of the stator frame and the intermediate plate to constrain movement of the stator core relative to the stator frame in at least one direction in the axial direction.
[0006] The stop member can move relative to either the stator frame or the intermediate plate.
[0007] The stop mechanism can be detachably attached to one of the stator frame and the intermediate plate (i.e., completely removed from it). The stop mechanism can be removed via releasable or detachable fasteners.
[0008] Multiple stop structures can be provided. The stop structures can be circumferentially spaced apart. The stop structures can include plates.
[0009] The stator frame and the intermediate plate may include a recess. The recess may be configured to receive a stop structure. The recess may extend circumferentially around the stator frame or the intermediate plate. The recess may be continuous (i.e., multiple stop plates may be received in a single recess). The recess may be discontinuous.
[0010] The stop can be loosely held on the other of the stator frame and intermediate plate (e.g., without fasteners or other attachments). The stop can be held such that the stator core is constrained only in one axial direction. The stop can be loosely held on / in a groove.
[0011] The stator frame or stator core may include a driving end and a non-driving end. A stop may be located near one of the driving end and the non-driving end, such that the other is unconstrained in the axial direction. Alternatively, a stop may be located near both the driving end and the non-driving end, such that both are constrained in the axial direction. The stop may prevent axial movement in one direction at the non-driving end and prevent axial movement in the opposite second direction at the driving end.
[0012] One of the stator frame and the intermediate plate may include a groove. This groove may be configured to receive a stop within it. The stop may be mounted or attached to the groove. The stop and / or the groove may be positioned in an axially outward direction. Axial outward movement may be permitted while preventing axial inward movement. The groove may include a retaining feature to attach the stop. The retaining feature may include a hole and / or threads. Fasteners may extend between the stop and the groove.
[0013] The stop member may be coplanar with the stator frame and / or intermediate plate.
[0014] The groove and / or stop member may extend in the radial direction. The stop may extend radially outward from the stator frame or intermediate plate. The stop is located on the outer edge of the intermediate plate. The stop is located on the inner edge of the stator frame.
[0015] The intermediate plate can be annular or ring-shaped. The stator frame may include holes to receive the intermediate plate therein.
[0016] The stator frame may include an outer plate. The outer plate may include a bearing housing mounting surface. The outer plate may include recesses to allow a stop member to pass through when attached to an intermediate member. The recess may extend in the radial direction. Multiple recesses may be provided. The recesses may be circumferentially spaced around the bearing housing.
[0017] The intermediate member may include multiple compression portions configured to engage the stator core during use. The compression portions may include a hollow profile and / or a U-shaped profile.
[0018] The motor may include one or more plates. These plates can be fixed to both the intermediate member and the stator frame to establish a rigid connection between them. Multiple plates may be provided. These plates may be circumferentially spaced apart.
[0019] Electric motors may include generators and / or motors.
[0020] According to another aspect, a method for assembling an electric motor is provided, the method comprising: providing a stator core extending along an axial direction and supporting the stator core using a stator frame; supporting the stator core using an intermediate plate between the stator core and the stator frame, wherein one of the stator frame and the intermediate plate includes a stop structure; and abutting the stop structure against the other of the stator frame and the intermediate plate to constrain movement of the stator core relative to the stator frame in at least one direction in the axial direction.
[0021] The method may include cold-shrink fitting a stator core to a stator frame. A stop structure may be adjacent to the other of the stator frame and the intermediate plate to restrain movement of the stator core before and / or during the cooling phase of the cold-shrink fitting process.
[0022] Where feasible, any aspect of the invention may be combined with any other aspect of the invention. Attached Figure Description
[0023] Referring to the accompanying drawings, embodiments of the present invention are described below by way of example only:
[0024] Figure 1 An exploded perspective view of the motor is shown;
[0025] Figure 2 A perspective view of the motor is shown;
[0026] Figure 3 An end view of the motor is shown;
[0027] Figure 4 A perspective view of the middle plate is shown;
[0028] Figure 5 A perspective view of the stop component is shown;
[0029] Figure 6 A plan view of the stop member that engages the stator frame is shown;
[0030] Figure 7 A cross-sectional side view of the stop member connecting the stator frame is shown;
[0031] Figure 8 A perspective view of the bearing housing mounting surface of the motor is shown;
[0032] Figure 9A plan view of the recess on the bearing housing mounting surface is shown. Detailed Implementation
[0033] Figure 1 and Figure 2 The image shows a motor 2. In this embodiment, the machine 2 includes a motor. In other embodiments, the machine 2 includes a generator or the like. The motor 2 includes a frame 4 configured to support a stator core 6. The frame 2 is rectangular in shape. The frame 2 includes a plurality of frame plates 8 configured to receive the core 6. The frame plates are spaced apart along the axial length of the machine 2. The frame plates 8 include circular holes 10 for receiving and mounting the core 6. It is understood that the exact shape or form of the frame 4 and the core 6 is irrelevant to the present invention.
[0034] like Figure 2 and Figure 3 As shown, the stator core 6 is mounted to a pair of inner plates 8A and 8B. An intermediate plate 12 or a pressure plate is disposed between one of the inner plates 8A and the stator core 6. A second intermediate plate (not shown) is disposed between the second plate 8B and the stator core 6. The intermediate plate 12 is disposed near end 14 of the stator core 6. A second direct plate 12 is disposed near the second end 16 of the stator core 6. The stator core 6 includes stator windings 18. The stator 6 is mounted into the frame via a heat-shrink process. After the heat-shrink process, a plate 22 is attached between the intermediate plate 12 and the inner plates 8A and 8B to establish a secure connection between them.
[0035] Figure 4 The intermediate plate 12 is shown separately. The intermediate plate 12 has an annular or ring-shaped shape. A hole 24 is provided to receive the core 6. A tab 26 or serrations are provided to engage the inner plate 8A. The tab 26 may also provide attachment points for the stator core 6. A hole 28 is provided on the tab 26 to allow attachment of the plate 22.
[0036] A groove 30 is provided on the first surface 32 of the intermediate plate 12. The groove 30 extends radially (i.e., between the edge of the hole 24 and the outer surface of the plate 12). The groove 30 is rectangular in plan and / or cross-section. The groove 30 includes a flat surface 34 therein. In this embodiment, three grooves 30 are provided. The grooves 30 are equidistantly spaced around the plate 12.
[0037] Compression portions 35 are disposed on opposite sides of the intermediate plate 12. Compression portions 35 are configured to engage the stator core 6 to provide compressive force thereto. Compression portions 35 include a U-shaped or hollow profile (i.e., in the radial direction). This allows for a degree of bending. Multiple compression portions are displaced around the periphery of the intermediate plate 12. In this embodiment, 30 portions 35 are provided; however, it is understood that any number of portions can be provided accordingly depending on specific requirements. For example, 2 to 50 portions 35 can be provided.
[0038] refer to Figures 5 to 7 In use, the baffle 36 is mounted to the intermediate plate 12. The stop plate 36 is installed within the groove 30. The stop plate 36 can be attached by fasteners 38. The fasteners 38 can be received in attachment features 40 (e.g., threads) provided in the groove 30. Thus, the stop plate 36 is removably attached to the intermediate plate. A corresponding hole 42 is provided in the plate 36. The stop plate 12 may include a rectangular shape. The stop plate 12 may be substantially planar. The stop plate 12 is coplanar with the intermediate plate (i.e., they lie flat on each other).
[0039] The stop plate 36 is dimensioned such that it extends beyond the coverage area of the intermediate plate 12 (e.g., beyond its outer edge 44). In use, the stop plate 36 rests against the inner plate 8A. This restricts the position of the intermediate plate 12 during the installation of the stator core 6. For example, during a shrink-fit process, the position of the core 6 is held in place. Therefore, as the core 6 shrinks during cooling, its axial position can be determined more precisely, helping to avoid misalignment problems. Each groove in the groove 30 includes a corresponding stop plate 36.
[0040] It is understood that any number of grooves 30 can be provided. For example, 1 to 15 grooves 30 can be provided. Stop plates 36 can be provided for each groove 30 or only a portion thereof. For example, for a typical intermediate plate 12, a variety of different configurations can be provided, and the number of stop plates 36 used can vary depending on the specific configuration (e.g., a lighter core may require fewer stop plates 36).
[0041] like Figure 7 As shown, the inner plate 8A includes a recess 46 or groove. The recess is provided on the radially inner surface 48 of the inner plate 8A. The recess 46 faces the intermediate plate 12. The recess 46 receives a stop plate 36. This facilitates the radial positioning of the stop plate 36 (and thus the intermediate plate 12). The stop plate 36 is loosely held in the recess 46 (i.e., without the use of fasteners). In this embodiment, the recess 46 extends substantially around the entire periphery of the inner plate 8A (i.e., continuously). This allows for flexibility in the positioning of the intermediate plate 12 and / or the stop plate 36. In other embodiments, a plurality of discrete recesses are provided around the periphery of the inner plate 8A. The positions of the recesses correspond to the stop plate 36. This can facilitate the positioning of the stator core 6 in the peripheral direction.
[0042] In this embodiment, the depth of the intermediate plate groove 30 and the inner plate recess 46 is less than the depth of the stop plate 36. The stop plate 36 therefore protrudes above the surfaces of the intermediate plate 12 and / or the inner plate 8A. In other embodiments, the depth of the intermediate plate groove 30 and the inner plate recess 46 is equal to or less than the depth of the stop plate 36. The stop plate 36 is therefore flush with and / or recessed relative to the surfaces of the intermediate plate 12 and / or the inner plate 8A.
[0043] refer to Figure 8 and Figure 9 The diagram shows an outer plate 48. The outer plate 48 is located at the end 50 of the stator frame. The outer plate 48 may have a bearing cover mounting surface. The outer plate 48 includes a recess 52 to allow the stop plate 36 to pass through during installation. The depth 54 of the recess corresponds to the amount by which the stop plate 36 extends from the intermediate plate 12. Multiple recesses 52 are provided at positions corresponding to the stop plates 36. In this embodiment, three recesses 52 are provided. Similarly, it can be understood that any number of recesses can be provided depending on the number of stop plates 36. The recesses 52 help ensure circumferential alignment of the core 6 during installation.
[0044] In this embodiment, the stop plate device is disposed at the non-drive end 50 (generally referred to as the "N end") of the motor 2. This provides axial restraint at one end of the stator core 6 and allows it to move freely, thereby allowing shrinkage during the cold-shrink fitting process. In other embodiments, the stop plate device is disposed at the drive end 52 ("D end") or both the non-drive end 50 and the drive end 52. For example, the stop device is additionally or alternatively disposed on the second inner plate 8B.
[0045] In some embodiments, a stop plate 36 is mounted to an inner plate 8A. For example, the stop plate 36 is disposed on the axial inner surface of the inner plate 8A. In some embodiments, the stop plate 36 is mounted to both the inner plate 8A and the intermediate plate 12.
[0046] In this embodiment, the stop plate 36 can be completely detached from the intermediate plate 12. In other embodiments, the stop plate 36 can be movably fixed to the intermediate plate 12. For example, the stop plate 36 can be slidably, rotatably, or pivotally attached to the intermediate plate 12. The stop plate 36 can therefore be moved to disengage from the inner plate 8A. A locking or retaining mechanism can be used to retain the stop plate 36 in use.
[0047] In this embodiment, the stop plate 36 is configured to constrain the stator core in one direction. This direction is parallel to the axial or rotational axis 20 of the motor (see...). Figure 1The core is prevented from moving in the direction toward the drive end 52, but is free in the direction toward the non-drive end 50. A stop plate 36 is disposed on the intermediate plate 12 in the direction toward the non-drive end 50 (i.e., outwards). This allows for easier access for assembly or disassembly. In some embodiments, movement can be constrained in both axial directions. For example, the stop plate 36 can be fixed to the inner plate 8A.
[0048] Operation of the present invention
[0049] Intermediate plate 12 is fixed to stator core 6. Core 6 is heated and positioned together with stator frame 4. It is understood that these steps can be provided in any order. During insertion of stator core 6 into stator frame 4, stop plate 36 is aligned with recess 52 in outer plate 48. Core 6 is moved until stop plate 36 abuts inner plate 8A. Stop plate 36 is located within inner plate groove 30 to help ensure radial alignment.
[0050] The stator core 6 is then cooled. The end portions 18 move toward each other during contraction and abut against the intermediate portion 12. Then, the second intermediate portion aligns with the inner plate 18B while the first intermediate portion 12 is restrained by the stop plate 36. This restraint ensures that the stator core 6 is in the correct axial position during the cooling phase. Once cooling is complete, plates 22 are attached to the corresponding intermediate plates 12 and inner plates 8A, 8B to provide a permanent fixing device.
[0051] If the axial alignment is not precise enough, the stator 6 can be reheated. If necessary, the stop plate 36 can be removed to allow the removal of the core 6 (i.e., the core 6 can be removed from both axial directions).
[0052] For example, this device helps ensure stator core alignment during the cold-shrink fitting process. Providing constraint in one direction aids alignment without interfering with the cold-shrink fitting process. The presence of a stop member and associated grooves on the outward-facing side of the inner plate allows for easier removal of the stator core. The stop plate can further aid in peripheral alignment due to recesses in the inner and / or outer plates. The stop member also allows for stator core removal from either direction.
Claims
1. An electric motor (2), comprising: Stator core (6), which extends along the axial direction (20) and is supported by stator frame (4); Intermediate plate (12), the intermediate plate being disposed between the stator core (6) and the stator frame (4) and configured to support the stator core (6); One of the stator frame (4) and the intermediate plate (12) includes a stop structure (36) configured to abut the other of the stator frame (4) and the intermediate plate (12) to restrain the movement of the stator core (6) relative to the stator frame (4) in at least one direction in the axial direction (20); and The stop structure (36) is movable relative to one of the stator frame (4) and the intermediate plate (12).
2. The motor according to claim 1, wherein the stop structure (36) is detachably fixed to one of the stator frame (4) and the intermediate plate (12).
3. The motor according to claim 1, wherein the other of the stator frame (4) and the intermediate plate (12) includes a recess (46) configured to receive the stop structure (36).
4. The motor according to claim 1, wherein the stop structure (36) is loosely held on the other of the stator frame (4) and the intermediate plate (12), such that the stator core (6) is constrained only in one direction in the axial direction (20).
5. The motor according to claim 1, wherein the stator frame (6) or the stator core (4) includes a driving end (52) and a non-driving end (50), and the stop structure (36) is close to one of the driving end and the non-driving end such that the other of the driving end and the non-driving end is not constrained in the axial direction via the stop structure (36).
6. The motor according to claim 1, wherein one of the stator frame (4) and the intermediate plate (12) includes a groove (34) configured to receive the stop structure (36) therein.
7. The motor according to claim 1, wherein the stop structure (36) is coplanar with the stator frame (4) and / or the intermediate plate (12).
8. The motor according to claim 1, wherein the groove (34) and / or the stop member (36) extends in the radial direction.
9. The motor according to claim 1, wherein the intermediate plate (12) is annular or ring-shaped.
10. The motor according to claim 1, wherein the stator frame (4) includes an outer plate (48), and the outer plate (48) includes a recess (52) to allow the stop member (36) to pass through the recess when it is secured to the intermediate member (12).
11. The motor according to claim 1, wherein the intermediate member (12) includes a plurality of compression portions (35) configured to engage the stator core (6) in use, the compression portions (35) including a hollow profile.
12. The motor according to claim 1, comprising one or more plates (22) fixed to both the intermediate member (12) and the stator frame (4) to provide a rigid connection therebetween.
13. A method for assembling a motor (2), comprising: A stator core (6) is provided that extends along the axial direction (20), and the stator core (6) is supported by a stator frame (4); The stator core (6) is supported by an intermediate plate (12) between the stator core (6) and the stator frame (4), wherein one of the stator frame (4) and the intermediate plate (12) includes a stop structure (36); The stop structure (36) is abutted against the other of the stator frame (4) and the intermediate plate (12) to restrain the movement of the stator core (6) relative to the stator frame (4) in at least one direction in the axial direction (20); and The stop member (36) is movable relative to one of the stator frame (4) and the intermediate plate (12).
14. The method of assembling an electric motor according to claim 13, comprising cold-shrink fitting the stator core (6) onto the stator frame (4), wherein the stop structure (36) is adjacent to the other of the stator frame (4) and the intermediate plate (12) to restrain movement of the stator core (6) before and / or during the cooling phase of the cold-shrink fitting process.
15. An intermediate plate (12) for a motor (2), the intermediate plate being configured to be disposed between a stator core (6) and a stator frame (4) and configured to support the stator core (6), the intermediate plate comprising: A stop structure (36) configured to engage the stator frame (4) to restrain, in use, movement of the stator core (6) relative to the stator frame (4) in at least one direction in the axial direction (20) of the stator core (6); and The stop member (36) is movable relative to the intermediate plate (12).