Stator profiled hybrid lamination structure and motor thereof

Abstract

The present application relates to a kind of stator profiled mixed lamination structure and motor thereof, including by the first stator sheet of multiple pieces Axially laminated and formed radial lamination group, the radial lamination group is annular, the radial lamination group includes multiple stator teeth and the stator yoke at the tail of the stator tooth, further including by the second stator sheet of multiple pieces Radially laminated and formed axial lamination group, the middle part of the stator yoke is provided with slot, the axial lamination group is inserted into the slot, the second stator sheet is perpendicular to the first stator sheet, the axial lamination group is formed in radial along the limit of the magnetic flux line from circumferential to radial Staircase shape.The axial lamination group is formed in radial along the limit of the magnetic flux line from circumferential to radial in the present application Staircase shape, modulates the magnetic force line distribution of leakage magnetic region, to enhance the salient pole effect of stator, enlarge the weak magnetic region of motor and promote the highest speed.

Description

Technical Field

[0001] This invention relates to a stator irregular shape hybrid lamination structure and its motor, belonging to the field of motor technology. Background Technology

[0002] Permanent magnet synchronous motors are widely used in electric vehicles, industrial drives, and other fields due to their high power density and high efficiency. To meet the demand for a wide speed range, field weakening control technology is crucial. Traditional methods for increasing the motor's maximum speed (widening the field weakening region) typically require redesigning the motor's magnetic circuit, such as optimizing the permanent magnet layout and using thinner silicon steel sheets. This often leads to increased costs, more complex manufacturing processes, and may sacrifice torque performance in the low-speed range or increase torque ripple. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a stator irregular shape hybrid lamination structure and its motor that enhances the stator salient pole effect, expands the weak magnetic region of the motor, and increases the maximum speed.

[0004] To achieve the objective, the technical solution adopted by this invention is:

[0005] A stator irregular-shaped hybrid lamination structure includes a radial lamination group formed by axially stacking multiple first stator steel sheets. The radial lamination group is annular and includes multiple stator teeth and a stator yoke located at the tail of the stator teeth. It also includes an axial lamination group formed by radially stacking multiple second stator steel sheets. A slot is provided in the middle of the stator yoke, and the axial lamination group is inserted into the slot. The second stator steel sheets are perpendicular to the first stator steel sheets. The axial lamination group forms a stepped shape radially along the boundary between the circumferential and radial directions of the magnetic flux lines. All the second stator steel sheets are arranged in a decreasing order of length from the inside to the outside in the radial direction.

[0006] As a further optimization of the above technical solution: the axial lamination group includes multiple second stator steel sheets of five different lengths, so that both sides of the axial lamination group have five steps.

[0007] As a further optimization of the above technical solution: the axial lamination group and the radial lamination group are welded and fixed together.

[0008] The motor includes a stator irregular shape hybrid lamination structure as described in the above technical solution, and also includes a rotor, the rotor being located on the inner circumferential surface of the radial lamination group, and the rotor having several sets of V-shaped magnets embedded in it.

[0009] Compared with existing technologies, the axial lamination group in this invention forms a stepped shape along the boundary of the magnetic flux line from the circumferential to the radial direction, modulating the magnetic field line distribution in the leakage magnetic region, thereby enhancing the stator salient pole effect, expanding the weak magnetic region of the motor, and increasing the maximum speed. Under the same electrical configuration parameters and the same size and shape of the motor, the insertion of the axial lamination group significantly changes the external characteristic curve of the motor, realizing the transformation of the motor topology with minimal cost, turning a high-torque, low-speed motor into a medium-torque, high-speed motor. At the same time, the external torque fluctuation and cogging torque of the motor do not change much. While improving high-speed performance, it retains the original motor's smoothness, low vibration, and low noise characteristics during low-speed operation. The slot fits the axial lamination group in a stepped shape, forming an interlocking fit between the axial lamination group and the radial lamination group, increasing the contact area and mechanical interlocking effect. The stepped axial lamination group uses discrete second stator steel sheets of five different lengths to form five steps in the axial lamination group to approximate the continuously changing ideal magnetic circuit. The five-step setting is the optimal solution that balances magnetic circuit performance, material utilization, and manufacturing cost. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0011] Figure 2 This is a three-dimensional structural diagram of the cooperation between a single stator tooth, a single stator yoke, and an axial lamination assembly in this invention.

[0012] Figure 3 This is a comparison diagram of the magnetic flux lines of a conventional motor and the present invention.

[0013] Figure 4 A comparison chart of the external characteristic curves of conventional motors, conventional motors with reduced stacking height, and the present invention.

[0014] Figure 5 A comparison chart showing the efficiency of conventional motors, conventional motors with reduced stacking height, and the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. For example... Figure 1-5As shown, an electric motor includes a radial lamination group 1 formed by axially stacking multiple first stator steel sheets 11. The radial lamination group 1 is annular and includes multiple stator teeth 13 and a stator yoke 14 located at the tail of the stator teeth 13. It also includes an axial lamination group 2 formed by radially stacking multiple second stator steel sheets 21. A slot 12 is provided in the middle of the stator yoke 14, and the axial lamination group 2 is inserted into the slot 12. The second stator steel sheets 21 are perpendicular to the first stator steel sheets 11. The axial lamination group 2 forms a stepped shape radially along the boundary between the circumferential and radial directions of the magnetic flux lines, modulating the magnetic flux line distribution in the leakage flux region, lengthening the magnetic flux lines, thereby enhancing the stator salient pole effect, expanding the field weakening region of the motor, and increasing the maximum speed. The above conclusions are based on the field weakening capability coefficient formula: It is concluded that, among them idLd is the flux linkage of the permanent magnet, and idLd is the flux linkage along the d-axis. As the magnetic field lines lengthen, Ld decreases, and an increase in β indicates enhanced field weakening capability. Under the same electrical configuration parameters and the same size and shape of the motor, the insertion of the axial lamination group 2 significantly alters the external characteristic curve of the motor (e.g., ...). Figure 4 As shown, this achieves a minimal cost-effective transformation of the motor topology, converting a high-torque, low-speed motor into a medium-torque, high-speed motor. Simultaneously, the external torque fluctuation and cogging torque of the motor remain largely unchanged. This improves high-speed performance while preserving the original motor's smoothness, low vibration, and low noise characteristics during low-speed operation. The slot 12, in conjunction with the axial lamination group 2, is also stepped, forming an interlocking fit between the axial lamination group 2 and the radial lamination group 1, increasing the contact area and mechanical interlocking effect. For ease of comparison, Figure 4 and Figure 5 In addition to the conventional motor with a stacking height of 50mm and the irregular hybrid lamination design of this invention, a conventional motor with a stacking height reduced to 38mm is also included for comparison, such as... Figure 4 As shown, under the same power and current conditions, the inflection point speed at which the constant torque range transitions to the field weakening range in this invention is increased by one-third (1500rpm to 2000rpm), expanding the field weakening range. The maximum speed is increased by 62.5% compared to a conventional motor (2000rpm to 3250rpm) and by 18.2% compared to a 38mm stacked height motor (2750rpm expanded to 3250rpm). Figure 5 As shown, this invention greatly improves the inflection point speed and the maximum speed. Compared with a 38mm stacked height motor, it has a larger heat dissipation area, resulting in a slower temperature rise and higher conversion efficiency. The 95% contour line has a larger area in the efficiency graph.

[0016] In the above technical solution: the axial lamination group 2 includes multiple second stator steel sheets 21 of five different lengths. All the second stator steel sheets 21 are arranged in a radial direction with decreasing length from the inside to the outside, giving both sides of the axial lamination group 2 five-level steps. The stepped axial lamination group 2 uses discrete second stator steel sheets 21 of five different lengths to form the five-level steps of the axial lamination group 2, approximating a continuously changing ideal magnetic circuit. The five-level step configuration is the optimal solution balancing magnetic circuit performance, material utilization, and manufacturing cost.

[0017] In the above technical solution: the axial lamination group 2 and the radial lamination group 1 are welded and fixed together.

[0018] The above technical solution also includes a rotor 3, which is located on the inner circumferential surface of the radial lamination group 1. Several sets of V-shaped magnets 4 are embedded in the rotor 3.

[0019] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of the present invention.

Claims

1. A stator profiled hybrid lamination structure comprising a radial lamination set (1) formed by axially stacking a plurality of first stator steel sheets (11), the radial lamination set (1) being annular, the radial lamination set (1) comprising a plurality of stator teeth (13) and a stator yoke (14) located at the trailing end of the stator teeth (13), characterized in that The axial laminated group (2) is formed by radially laminating a plurality of second stator steel sheets (21), a middle part of the stator yoke (14) is provided with an insertion slot (12), the axial laminated group (2) is inserted into the insertion slot (12), the second stator steel sheets (21) are perpendicular to the first stator steel sheets (11), the axial laminated group (2) is formed in a stepped shape along the magnetic flux line from the circumferential direction to the radial direction, and all the second stator steel sheets (21) are arranged in a decreasing length from inside to outside along the radial direction.

2. The stator profiled hybrid lamination structure of claim 1, wherein The axial laminated group (2) includes a plurality of second stator steel sheets (21) with five lengths, so that both sides of the axial laminated group (2) have five steps.

3. The stator profiled hybrid lamination structure of claim 1, wherein The axial laminated group (2) is welded and fixed with the radial laminated group (1).

4. An electric machine comprising a stator profiled hybrid lamination structure according to any one of claims 1 to 3, characterized in that The rotor (3) is located on the inner circumferential surface of the radial laminated group (1), and a plurality of groups of V-shaped magnetic steel (4) are embedded in the rotor (3).

Images