A fixing structure of a rotor core with high reliability

Abstract

The utility model relates to a fixing structure with high reliability of rotor iron core, including rotor iron core body, the inside center of rotor iron core body is equipped with the hole, the outer ring of hole is evenly provided with the conductor hole, the front and back sides of rotor iron core body are close to the position department of outer edge and are equipped with the mounting recess, the hole inside interference fit pivot, the front and back ends of rotor iron core body are equipped with annular compression ring, have improved the reliability of rotor iron core and pivot connection fixation, effectively avoided the advantage that the front and back end compression ring unfastens.

Description

Technical Field

[0001] This utility model relates to the field of motor rotor processing technology, and in particular to a fixing structure for rotor core with high reliability. Background Technology

[0002] As the core component of the motor, the rotor core is the core part of the motor's magnetic circuit. It undertakes the function of magnetic conduction and is responsible for transmitting magnetic field energy to realize the conversion of electrical energy and mechanical energy. The core, together with the shaft and permanent magnet (or winding), constitutes the rotor body and must withstand centrifugal force, torque and thermal stress under high-speed rotation.

[0003] Patent application number CN202421863224.0 is a Chinese utility model patent that discloses a high-efficiency and energy-saving motor stator and rotor core, belonging to the field of stator and rotor core technology. It includes a first rotor core, the lower end face of the first rotor core is provided with a positioning groove, a second rotor core is stacked on the lower surface of the first rotor core, and a protrusion is fixedly connected to the upper end face of the second rotor core. The beneficial effects of this invention are that by engaging the first rotor core with the second rotor core through positioning grooves and protrusions, it ensures stable positioning during assembly and operation, preventing displacement or loosening, thus ensuring equipment quality, increasing the stability and rigidity of the entire structure, reducing the possibility of vibration or deformation during operation, and contributing to improved motor operational stability and reliability. The superimposed second rotor core optimizes the magnetic circuit, reduces magnetic resistance, and improves magnetic field conduction efficiency, thereby improving motor efficiency and performance. However, this rotor core has the following problems: Firstly, the rotor core and shaft are prone to loosening under long-term vibration, leading to micro-displacement between the core and shaft. Secondly, when the rotor core's rotational inertia is too large, the pressure ring is prone to loosening. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by setting a structure in which the size, position, and number of wedge-shaped grooves on the inner wall of the inner hole are matched with those of the wedge-shaped blocks on the rotating shaft. This structure provides double fixation while interfering with the inner hole of the rotating shaft, thus solving the technical problem that the rotor core and the rotating shaft are prone to loosening under long-term vibration, resulting in micro-displacement of the core and the shaft. Furthermore, the structure by setting an aluminum alloy outer ring and an alloy steel inner ring with an interfering fit between the annular pressure ring and the mounting groove solves the technical problem that the pressure ring is prone to loosening when the rotational inertia of the rotor core is too large.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-reliability fixing structure for rotor cores includes a rotor core body. The rotor core body has an inner hole at its center, and conductor holes are evenly arranged around the outer ring of the inner hole. Mounting grooves are provided on the front and rear sides of the rotor core body near the outer edge. An interference fit shaft is provided inside the inner hole. Annular pressure rings are provided at the front and rear ends of the rotor core body.

[0007] As a preferred embodiment, the conductor hole extends through the rotor core body from both ends.

[0008] As a preferred embodiment, a wedge-shaped groove is provided at the center of the inner wall of the inner hole. There are four wedge-shaped grooves, which are evenly distributed around the inner wall of the inner hole. The internal shape of the wedge-shaped groove is a right triangle.

[0009] As a preferred embodiment, wedge-shaped blocks are provided around the center of the rotating shaft. The wedge-shaped blocks are right-angled triangles. A receiving groove is provided at the center of the rotating shaft at the position of the wedge-shaped blocks. The receiving groove can accommodate the entire wedge-shaped blocks. The receiving groove and the wedge-shaped blocks are connected by a V-shaped spring steel sheet.

[0010] As a preferred embodiment, the size, position, and number of the wedge blocks and wedge grooves are all matched.

[0011] As another preferred embodiment, the annular pressure ring is provided with an aluminum alloy outer ring, the entire inner wall of the aluminum alloy outer ring is rigidly connected to an alloy steel inner ring, and a fixing ring is provided on the rear side of the annular pressure ring near the outer edge, the fixing ring being interference-fitted with the mounting groove.

[0012] The beneficial effects of this utility model are:

[0013] (1) In this utility model, by setting a structure in which the size, number and position of the wedge-shaped groove of the inner hole are matched with those of the wedge-shaped blocks of the rotating shaft, further fixation is provided while the rotating shaft and the inner hole are in an interference fit. When the rotating shaft is pressed down, the wedge-shaped blocks are squeezed by the inner wall of the iron core and embedded into the receiving groove by the radial inward shrinkage of the V-shaped spring steel sheet. The rotating shaft is pressed down smoothly as a whole. When the wedge-shaped blocks reach the wedge-shaped groove position, the wedge-shaped blocks are radially ejected by the V-shaped spring steel sheet and inserted into the wedge-shaped groove. Together with the interference fit of the rotating shaft and the inner hole, a double fixation is formed, eliminating the micro displacement that may occur between the inner hole of the rotor iron core and the rotating shaft, and increasing the reliability of the fixation between the rotor iron core and the rotating shaft.

[0014] (2) In this utility model, the interference fit between the fixing ring and the mounting groove eliminates the need for additional bolts or welding, reducing assembly errors and the risk of loosening. At the same time, when the motor runs and the temperature rises, the expansion of the aluminum alloy outer ring is greater than that of the alloy steel inner ring. The expansion of the outer ring is limited by the inner ring. By utilizing the thermal expansion difference, a clamping force is generated, which can effectively prevent the loosening of the front and rear end pressure rings under the high temperature operation of the motor.

[0015] In summary, this device has the advantages of improving the reliability of the connection and fixation between the rotor core and the shaft, and effectively avoiding the loosening of the front and rear end pressure rings, especially in the field of rotor core processing technology. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the rotor core body in this utility model.

[0019] Figure 3 This is a schematic diagram showing the position of the wedge-shaped groove on the inner wall of the inner hole and the position of the wedge-shaped block on the rotating shaft in this utility model.

[0020] Figure 4 This is an exploded view of the wedge block installation structure in this utility model.

[0021] Figure 5 This is a schematic diagram showing the position of the fixing ring in this utility model.

[0022] Figure 6 This is a schematic diagram of the annular pressure ring structure in this utility model. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figures 1 to 6 As shown, this utility model provides a high-reliability fixed structure for the rotor core: it includes a rotor core body 1, which is the basic component of the entire structure and the core part of the motor rotor, used to generate a rotating magnetic field. The rotor core body 1 has an inner hole 2 at its center, which is used to install a rotating shaft 4. Conductor holes 11 are evenly arranged around the outer ring of the inner hole 2, which are used to place conductors. When current passes through the conductors, a magnetic field is generated, which interacts with the stator magnetic field to make the rotor rotate. The rotor core body 1 has mounting grooves 12 near the outer edge on both the front and rear sides. The rotating shaft 4 is interference-fitted inside the inner hole 2. The rotating shaft 4 is a key component for transmitting power. The rotor core body 1 has annular pressure rings 3 at both the front and rear ends.

[0026] Furthermore, the conductor hole 11 extends through the rotor core body 1 from front to back, and the conductor hole 11 is used to accommodate the copper rod.

[0027] Furthermore, a wedge-shaped groove 21 is provided at the center of the inner wall of the inner hole 2. There are four wedge-shaped grooves 21, which are evenly located around the inner wall of the inner hole 2. The internal shape of the wedge-shaped groove 21 is a right triangle. The four wedge-shaped grooves 21 are evenly located on the inner wall of the inner hole 2 to ensure symmetrical force distribution.

[0028] Furthermore, wedge-shaped blocks 41 are provided around the center of the rotating shaft 4. The wedge-shaped blocks 41 are right-angled triangles. A receiving groove 42 is provided at the center of the rotating shaft 4 at the position of the wedge-shaped blocks 41. The receiving groove 42 can accommodate the wedge-shaped blocks 41 to be embedded as a whole. The receiving groove 42 and the wedge-shaped blocks 41 are connected by a V-shaped spring steel sheet 43. During assembly, the V-shaped design of the V-shaped spring steel sheet 43 allows the wedge-shaped blocks 41 to fold inward when compressed, reducing assembly resistance.

[0029] Furthermore, the size, position, and number of the wedge block 41 and the wedge groove 21 are all matched. During the interference fit process of the rotating shaft 4 pressing into the inner hole 2, the wedge block 41 is radially squeezed by the inner wall of the iron core, which forces the V-shaped spring steel sheet 43 to compress, causing the wedge block 41 to shrink inward and embed into the receiving groove 42, allowing the rotating shaft 4 to press down smoothly. When the wedge block 41 is aligned with the wedge groove 21, the elastic restoring force of the V-shaped spring steel sheet 43 will radially pop the wedge block 41 and lock it into the inclined surface of the wedge groove 21, forming a mechanical interlock. The wedge structure can resist loosening under running vibration through the self-locking effect of the inclined surface.

[0030] Furthermore, the annular pressure ring 3 is provided with an aluminum alloy outer ring 31, and the entire inner wall of the aluminum alloy outer ring 31 is rigidly connected to an alloy steel inner ring 32. A fixing ring 33 is provided on the rear side of the annular pressure ring 3 near the outer edge. The fixing ring 33 is a raised ring on the rear side of the annular pressure ring 3. The fixing ring 33 is interference-fitted with the mounting groove 12. During assembly, the fixing ring 33 is pressed into the mounting groove 12 to form a fixation, generating an initial clamping force. No bolts or welding are required, reducing assembly errors. At the same time, when the motor is running, the temperature may rise to 80-120°C. The expansion amount of the aluminum alloy outer ring 31 is greater than that of the alloy steel inner ring 32. The expansion of the aluminum alloy outer ring 31 attempts to expand radially outward, but the low expansion characteristics of the alloy steel inner ring 32 generate a reaction force, which transmits the clamping force to the interface between the fixing ring 33 and the mounting groove 12. This prevents the pressure ring from loosening.

[0031] Working process: First, the rotating shaft 4 is pressed into the inner hole 2 of the rotor core body 1 through an interference fit. At this time, the wedge block 41 at the center of the rotating shaft 4 is squeezed by the inner wall of the inner hole 2, which forces the V-shaped spring steel sheet 43 to deform. The wedge block 41 shrinks into the receiving groove 42, so that the rotating shaft 4 can be pressed down smoothly. Then, when the wedge block 41 moves to the corresponding position of the wedge groove 21 of the inner hole 2, the elastic restoring force of the V-shaped spring steel sheet 43 drives the wedge block 41 to pop out radially and get stuck in the wedge groove 21, forming a mechanical interlock. Together with the interference fit, it fixes the relative position of the rotating shaft 4 and the rotor core body 1. Then, the fixing ring 33 of the annular pressure ring 3 is aligned with the mounting groove 12 on the front and rear sides of the rotor core body 1 and pressed in through an interference fit, so that the annular pressure ring 3 composed of the aluminum alloy outer ring 31 and the alloy steel inner ring 32 is tightly attached to the end face of the core.

[0032] Secondly, as the motor operates and the temperature rises, the aluminum alloy outer ring 31 expands radially due to its higher coefficient of thermal expansion compared to the alloy steel inner ring 32. This expansion, constrained by the rigidity of the alloy steel inner ring 32, creates a dynamic clamping force, further strengthening the interference fit between the fixing ring 33 and the mounting groove 12. Ultimately, the combined effect of dual mechanical locking and thermal expansion ensures the reliability of the rotor core body 1.

[0033] In the description of this utility model, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the roller or component 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 the utility model.

[0034] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0035] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A high-reliability fixing structure for rotor cores, characterized in that: The rotor core body (1) includes an inner hole (2) at the center of the inner hole (2), conductor holes (11) are evenly arranged on the outer ring of the inner hole (2), mounting grooves (12) are provided on the front and rear sides of the rotor core body (1) near the outer edge, an interference fit shaft (4) is provided inside the inner hole (2), and annular pressure rings (3) are provided on the front and rear ends of the rotor core body (1).

2. The high-reliability fixing structure for rotor core according to claim 1, characterized in that, The conductor hole (11) passes through the rotor core body (1) from front to back.

3. The high-reliability fixing structure for rotor core according to claim 1, characterized in that, The inner wall of the inner hole (2) is provided with a wedge-shaped groove (21) at the center. There are four wedge-shaped grooves (21), which are evenly located around the inner wall of the inner hole (2). The inner shape of the wedge-shaped groove (21) is a right triangle.

4. The high-reliability fixing structure for rotor core according to claim 1, characterized in that, The rotating shaft (4) is provided with wedge-shaped blocks (41) around its center position. The wedge-shaped blocks (41) are right-angled triangles. The rotating shaft (4) is provided with a receiving groove (42) at the position of the wedge-shaped blocks (41). The receiving groove (42) can accommodate the wedge-shaped blocks (41) to be embedded in the whole. The receiving groove (42) and the wedge-shaped blocks (41) are connected by a V-shaped spring steel sheet (43).

5. The high-reliability fixing structure for the rotor core according to claim 4, characterized in that, The size, position, and number of the wedge block (41) and the wedge groove (21) are all matched.

6. The high-reliability fixing structure for rotor core according to claim 1, characterized in that, The annular pressure ring (3) is provided with an aluminum alloy outer ring (31) on the outside. The entire inner wall of the aluminum alloy outer ring (31) is rigidly connected to an alloy steel inner ring (32). A fixing ring (33) is provided on the rear side of the annular pressure ring (3) near the outer edge. The fixing ring (33) is interference-fitted with the mounting groove (12).

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