A segmented butterfly surface mount rotor lamination inner rotor structure

Abstract

This utility model relates to the technical field of internal rotor structure in motors, and particularly to a segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure. It includes: a rotating shaft, several rotor cores sequentially mounted on the outer periphery of the rotating shaft, and a locking assembly that completely fixes the several rotor cores. The rotor laminations on the outer periphery of the rotor cores are arranged in a butterfly-shaped anti-symmetrical shifted skewed pole configuration. Several dovetail grooves adapted to the rotor laminations are provided on the rotor cores. The locking assembly includes: a left cover plate disposed at one end of the rotor core and sleeved on the rotating shaft, a right cover plate disposed at the other end of the rotor core, and several fasteners that fix the left and right cover plates together. This utility model provides a segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure with advantages such as improved motor efficiency, good vibration and noise reduction effect, long service life, high reliability, simple structure, and convenient assembly and disassembly.

Description

Technical Field

[0001] This utility model relates to the technical field of internal rotor structure in motors, and in particular to an internal rotor structure of segmented butterfly-shaped surface-mounted rotor laminations. Background Technology

[0002] Permanent magnet synchronous traction machines (permanent magnet synchronous motors) have advantages such as high torque density, wide speed range, high power efficiency, low moment of inertia, and large allowable pulse torque, and are widely used in the elevator industry. The stator slots of permanent magnet synchronous traction machines cause uneven distribution of magnetic flux density in the air gap, leading to negative effects from the tooth cogging. The skewed-pole rotor structure can effectively suppress tooth harmonic magnetic fields and reduce magnetic reluctance losses during motor operation.

[0003] The defects and shortcomings of existing technologies: The internal rotor of the permanent magnet synchronous traction machine will increase the manufacturing and assembly cost of the traction machine rotor assembly; if the permanent magnet synchronous traction machine uses an internal rotor lamination structure, the use of a skewed pole structure will increase the design difficulty, manufacturing cost and assembly difficulty; the use of rotor segmented displacement skewed pole will generate unbalanced axial electromagnetic force, which will reduce the bearing life and increase the vibration and noise of the traction machine.

[0004] Chinese patent CN210744860U discloses a layered skewed pole structure for the inner rotor of a permanent magnet motor, including a rotor core and permanent magnets disposed on the rotor core. The rotor core is divided into at least two layers of rotor core segments along the axial direction. Each layer of the rotor core segment is equipped with a segmented permanent magnet segment, and the permanent magnet segments of the same pole in different segments are staggered circumferentially at a certain angle. This utility model design segments and layers the rotor core and permanent magnets, and the permanent magnet units in different layers are gradually staggered circumferentially. This structural design can effectively reduce the cogging torque of the rotor, thereby improving the output performance of the rotor, reducing vibration and noise during motor operation, and improving the transient start-up performance of the motor.

[0005] However, this technical solution only tilts the poles in one direction, which may lead to uneven magnetic field distribution, thereby increasing torque pulsation and vibration, thus affecting the smoothness and performance of the motor. Furthermore, the uneven magnetic field distribution will increase the iron and copper losses of the motor, reduce the operating efficiency of the motor, and increase energy consumption. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure. This structure employs a butterfly-shaped anti-symmetrical shifted pole arrangement to mount the rotor laminations. The butterfly-shaped anti-symmetrical structure has two anti-symmetrically distributed magnetic pole shifting surfaces. The rotor's axial magnetic flux density amplitude is the same but in opposite directions, causing the axial electromagnetic forces on the magnetic pole shifting surfaces to cancel each other out. This suppresses the axial electromagnetic force, weakens harmonic effects, reduces unbalanced leakage flux, avoids vibration and noise caused by axial electromagnetic forces, and ensures the stability of the motor during operation.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure includes: a rotating shaft, a plurality of rotor cores sequentially installed on the outer periphery of the rotating shaft, and a locking assembly that completely fixes the plurality of rotor cores. The rotor laminations on the outer periphery of the plurality of rotor cores are arranged in a butterfly-shaped anti-symmetrical shifted skewed pole configuration.

[0009] Preferably, the rotor core is provided with a plurality of dovetail grooves that are adapted to the rotor laminations.

[0010] Preferably, the locking assembly includes: a left cover plate disposed at one end of the rotor core and sleeved on the rotating shaft, a right cover plate disposed at the other end of the rotor core, and a plurality of fasteners for fixing the left cover plate and the right cover plate together.

[0011] Preferably, the fasteners completely penetrate the rotor core, and the fasteners are evenly distributed inside the rotor core.

[0012] Preferably, an elastic retaining ring is provided between the right cover plate and the rotating shaft.

[0013] Preferably, the elastic retaining ring is installed in the slot of the rotating shaft and is positioned close to the right cover plate.

[0014] Preferably, one end of the rotating shaft is provided with a stepped shaft, and the outer diameter of the stepped shaft is larger than the outer diameter of the rotating shaft.

[0015] Preferably, the left cover plate is positioned close to the step axis.

[0016] Preferably, the dimensions of the left cover plate and the right cover plate are adapted to the outer diameter of the rotor core.

[0017] Preferably, the displacement angles of adjacent rotor cores are β°, 0°, and -β°, respectively.

[0018] The beneficial effects of this utility model are as follows:

[0019] (1) This utility model uses a rotor core assembly structure with butterfly-shaped anti-symmetric shifted skew poles to form a more uniform and continuous transition of the magnetic field in space, reducing abrupt changes and distortions in the magnetic field. This reduces electromagnetic force fluctuations generated during motor operation, thereby reducing motor vibration and noise levels, improving motor running stability, making the motor quieter during operation, and providing better comfort for the user environment. Furthermore, the uniform magnetic field distribution helps improve the motor's torque output performance, reduces torque pulsation, and enables the motor to maintain a relatively stable output under different loads and speeds, improving motor operating efficiency and reliability, and extending motor service life.

[0020] (2) This utility model adopts the stacking and assembly of inner rotor laminations, and the lamination structure adopts dovetail groove locking magnets, which saves the time spent on casting molds and processing, greatly shortens the assembly time of magnet installation, and improves work efficiency.

[0021] (3) By installing limiting cover plates on both sides of the rotor core and fixing multiple rotor core sections with several fasteners, the radial limiting of the rotor core and shaft is guaranteed. The method of using flat key limiting is eliminated. The rotor lamination with its own protruding limiting structure is adopted, which not only guarantees the fitting accuracy requirements, but also increases the magnetic field strength by adding more core material on the rotor surface.

[0022] In summary, this utility model has the advantages of improving motor working efficiency, good shock absorption and noise reduction effect, long service life, high reliability, simple structure and convenient disassembly and assembly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of the present invention;

[0025] Figure 3 This is an exploded view of the components of this utility model;

[0026] Figure 4 This is a cross-sectional schematic diagram of the rotor core of this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Example

[0030] like Figures 1-4 As shown, this embodiment provides a segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure, including: a rotating shaft 1, several rotor core segments 2 sequentially installed on the outer periphery of the rotating shaft 1, and a locking assembly 3 that completely fixes the several rotor core segments 2. That is, the entire rotor is a segmented structure. The rotor laminations 21 on the outer periphery of the several rotor core segments 2 are arranged in a butterfly-shaped anti-symmetrical shifted skewed pole configuration. This arrangement can effectively improve the magnetic field distribution of the motor. During motor operation, the butterfly-shaped anti-symmetrical shifted skewed pole rotor lamination structure can create a more uniform and continuous transition of the magnetic field in space, reducing the magnetic field distortion. The mutations and distortions reduce the electromagnetic force fluctuations generated by the motor during operation, thereby reducing the motor's vibration and noise levels, improving the motor's operational stability, making the motor quieter during operation, and providing better comfort for the user environment. Furthermore, the uniform magnetic field distribution helps improve the motor's torque output performance, reduces torque pulsation, and enables the motor to maintain a relatively stable output under different loads and speeds, improving the motor's operating efficiency and reliability, and extending the motor's service life. The locking component 3 can prevent the rotor core 2 from axially shifting or loosening during motor operation, ensuring the integrity of the rotor structure.

[0031] The segmented shifting skew pole is mainly intended to suppress the negative effects of tooth harmonic magnetic field (such as generating additional torque, generating vibration noise, increasing motor losses, and reducing efficiency). The locking assembly 3 realizes the radial limiting of rotor core 2 and shaft 1, eliminating the use of flat key limiting method. That is, the rotor lamination 21 has a structure with raised limiting, which not only ensures the fitting accuracy requirements, but also adds more core material to the rotor surface, increasing the magnetic field strength.

[0032] Meanwhile, the butterfly-shaped antisymmetric structure has two antisymmetric magnetic pole displacement surfaces, and the axial magnetic flux density amplitudes of the rotor are the same but opposite in direction, so that the axial electromagnetic forces on the magnetic pole displacement surfaces cancel each other out.

[0033] In this embodiment, the rotor core 2 is provided with a plurality of dovetail grooves 22 that are adapted to the rotor laminations 21, so that the rotor laminations 21 can be firmly embedded in the rotor core 2. The two fit together tightly, ensuring that the rotor laminations 21 will not be displaced or loosened during motor operation. This makes the rotor laminations 21 and the core form a whole, enhancing the stability of the entire rotor structure, improving the reliability of the motor under harsh conditions such as high-speed rotation, and preventing motor failure due to loose rotor laminations 21. Moreover, the shape and size of the dovetail grooves 22 can accurately position the rotor laminations 21, ensuring that the rotor laminations 21 can be accurately embedded into the designated position during installation, thereby improving the assembly accuracy of the rotor and further optimizing the magnetic field distribution and performance of the motor.

[0034] In this embodiment, rotor laminations 21 are stacked and assembled, and the rotor laminations 21 are locked with magnets using dovetail grooves 22, which saves the time spent on casting molds and processing, and greatly shortens the assembly time for magnet installation, thus improving work efficiency.

[0035] This invention employs a segmented shifted skewed pole design, achieving a skewed pole structure. Compared to a conventional skewed pole structure, this structure is similar to a stepped structure, which can also effectively suppress tooth harmonic magnetic fields and reduce magnetic reluctance losses during motor operation. Since motor skewed poles lead to a reduction in harmonic components and an increase in leakage flux, thus affecting torque reduction, the design of dovetail slots 22 on the rotor core 2 can increase magnetic field density, improve motor torque and output power, reduce harmonic noise, and improve motor efficiency. This can be integrated with the skewed pole structure.

[0036] In this embodiment, the locking assembly 3 includes: a left cover plate 31 disposed at one end of the rotor core 2 and sleeved on the rotating shaft 1, a right cover plate 32 disposed at the other end of the rotor core 2, and a plurality of fasteners 33 that fix the left cover plate 31 and the right cover plate 32 together, so that the locking assembly 3 forms a stable clamping structure, which can firmly fix the rotor core 2, so that it remains stable during motor operation, avoiding the impact on the performance and life of the motor due to the loosening of the core. Moreover, its structure is simple, easy to disassemble and assemble, and convenient for maintenance and repair.

[0037] In this embodiment, the fastener 33 completely penetrates the rotor core 2 and is evenly distributed inside the rotor core 2, which can firmly connect multiple sections of the rotor core 2 together, so that the rotor core 2 can evenly bear the forces from the radial and axial directions, avoid local stress concentration, thereby improving the strength and reliability of the rotor structure, extending its service life, and ensuring the stability of the rotor core 2 in the axial and circumferential directions. The fastener 33 is preferably a combination of a double-ended stud and a nut.

[0038] In this embodiment, the through-type fastener 33 connects multiple rotor cores 2 into a whole, which enhances the rigidity of the entire rotor, enabling it to better resist deformation when rotating at high speed, and ensuring the running accuracy and performance stability of the motor.

[0039] In this embodiment, an elastic retaining ring 34 is provided between the right cover plate 32 and the rotating shaft 1. Its main function is to prevent the right cover plate 32 from shifting axially during motor operation. At the same time, it provides a certain buffering and shock absorption effect on the right cover plate 32. The elastic retaining ring 34 can accurately limit the axial position of the right cover plate 32, ensuring that the locking assembly 3 always maintains a stable axial positioning during motor operation, avoiding loosening or damage to the rotor core 2 due to the displacement of the right cover plate 32, and improving the operational reliability of the motor.

[0040] In this embodiment, the elastic retaining ring 34 is installed in the slot 11 of the rotating shaft 1, which can prevent the elastic retaining ring 34 from loosening or falling off during the operation of the motor, ensuring that it is always in the correct working position, thereby improving the reliability of the entire locking assembly 3. The elastic retaining ring 34 is set close to the right cover plate 32, making the structure of the entire locking assembly 3 more compact, saving space, which is conducive to the overall miniaturization design of the motor, and also helps to improve the assembly accuracy and operational stability of the motor.

[0041] In this embodiment, a stepped shaft 12 is provided at one end of the rotating shaft 1. The stepped shaft 12 is mainly to provide a reliable support and positioning surface for installing the left cover plate 31 and to withstand the axial force generated during motor operation. The outer diameter of the stepped shaft 12 is larger than the outer diameter of the rotating shaft 1, so that it has a larger axial bearing area and can better withstand the axial force generated during motor operation, preventing the rotating shaft 1 from deforming or being damaged due to excessive axial force, and improving the operating stability and reliability of the motor.

[0042] In this embodiment, the left cover plate 31 is set close to the stepped shaft 12, which can make full use of the support and positioning provided by the stepped shaft 12 to firmly fix the rotor core 2 on the rotating shaft 1, prevent it from moving axially, ensure the stability of the rotor structure during the operation of the motor, and reduce motor failures caused by loosening of the rotor core 2.

[0043] In this embodiment, the dimensions of the left cover plate 31 and the right cover plate 32 are adapted to the outer diameter of the rotor core 2, which can ensure that the locking assembly 3 can fit tightly when fixing the rotor core 2, provide sufficient clamping force, and form a good sealing effect to prevent dust, impurities and other contaminants from entering the rotor, thereby improving the protection level of the motor and extending the service life of the motor.

[0044] Of course, the close fit between the left cover plate 31 and the right cover plate 32 and the rotor core 2 can ensure that the clamping force is evenly distributed on the outer periphery of the rotor core 2, avoiding excessive or insufficient local clamping force, thereby improving the stability and reliability of the rotor structure and ensuring the normal operation of the motor.

[0045] In addition, the number of rotor cores 2 is generally selected to be ≥4 segments and is a multiple of 2. The displacement angles of adjacent rotor cores 2 are β°, 0° and -β° respectively, so that the axial magnetic flux amplitude of the rotor is the same but the direction is opposite. This makes the axial electromagnetic forces on the magnetic pole displacement surface cancel each other out, suppressing the axial electromagnetic force, weakening the harmonic influence, reducing the unbalanced leakage flux, and avoiding vibration and noise caused by the axial electromagnetic force. The number of segments of the rotor core 2 is specifically divided according to the specific working conditions of the traction machine.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure, characterized in that, include: The rotating shaft, several rotor core segments sequentially installed on the outer periphery of the rotating shaft, and a locking assembly that completely fixes the several rotor core segments, wherein the rotor laminations on the outer periphery of the several rotor core segments are arranged in a butterfly-shaped anti-symmetrical shifted skew pole configuration.

2. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 1, characterized in that, The rotor core is provided with a number of dovetail grooves that are adapted to the rotor laminations.

3. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 1, characterized in that, The locking assembly includes: a left cover plate disposed at one end of the rotor core and sleeved on the rotating shaft, a right cover plate disposed at the other end of the rotor core, and a plurality of fasteners for fixing the left cover plate and the right cover plate together.

4. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 3, characterized in that, The fasteners completely penetrate the rotor core and are evenly distributed inside the rotor core.

5. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 3, characterized in that, An elastic retaining ring is provided between the right cover plate and the rotating shaft.

6. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 5, characterized in that, The elastic retaining ring is installed in the slot of the rotating shaft and is positioned close to the right cover plate.

7. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 3, characterized in that, One end of the rotating shaft is provided with a stepped shaft, and the outer diameter of the stepped shaft is larger than the outer diameter of the rotating shaft.

8. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 7, characterized in that, The left cover plate is positioned close to the step axis.

9. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 3, characterized in that, The dimensions of the left cover plate and the right cover plate are adapted to the outer diameter of the rotor core.

10. The segmented butterfly-shaped surface-mounted rotor lamination internal rotor structure according to claim 1, characterized in that, The displacement angles of adjacent rotor cores are β°, 0°, and -β°, respectively.

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