Spliced outer rotor stator and motor
By using oriented silicon steel sheets in the motor stator and combining a specific molding process, the problem of magnetically dense saturation of traditional motors at high speeds or high torques is solved, the efficiency and power of the motor are improved, and iron loss and temperature rise are reduced.
Patent Information
- Application Number
- CN202310830743.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-06
- Publication Date
- 2025-01-14
AI Technical Summary
The stator core material of traditional motors uses non-oriented silicon steel sheets, which leads to magnetically dense saturation under high speed or high torque conditions, causing iron loss and reducing motor efficiency.
Using oriented silicon steel sheets as the material for stator teeth, and through specific molding processes, such as winding and lagging structures, a spliced outer rotor stator is formed to ensure that the magnetic line direction is consistent with the rolling direction of oriented silicon steel sheets and reduce iron losses. .
Improve the magnetic conductivity of the motor, extend the saturation working point, improve the torque density per unit volume, reduce the width of the stator teeth, increase the area of the stator groove, reduce the temperature rise and copper loss, and improve the Motor power and efficiency.
Smart Images
Figure CN119315726A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a spliced outer rotor stator and a motor, belonging to the technical field of motor stators. Background Art
[0002] The stator core material of traditional motors is generally non-oriented silicon steel sheets, which have limited saturation magnetic flux density, which limits the performance of the motor under some special working conditions. For example, under high-speed or high-torque operating conditions, the stator core of the motor, especially the stator teeth, is limited by the size of the motor. Under the condition of a certain tooth width, the increase in magnetic flux density will cause the magnetic saturation of the stator core. Once the magnetic flux density is saturated at a certain point, it will inevitably cause a large amount of iron loss in the motor, thereby reducing the efficiency of the motor. Summary of the invention
[0003] The purpose of the present invention is to provide a spliced outer rotor stator and a motor capable of reducing iron loss in view of the shortcomings of the prior art.
[0004] To achieve the purpose, the technical solution adopted by the present invention is:
[0005] A spliced outer rotor stator comprises a stator core, wherein the stator core comprises a stator yoke and a plurality of stator teeth, and the material constituting the stator teeth comprises oriented silicon steel sheets.
[0006] As a further optimization of the above technical solution: a plurality of mounting blocks are connected to the stator yoke, insertion grooves are formed in the mounting blocks, the mounting blocks and the stator yoke are integrally formed to form a stator frame, insertion blocks are installed in the insertion grooves, and the insertion blocks and the mounting blocks together form the stator teeth.
[0007] As a further optimization of the above technical solution: the stator frame is formed by winding and laminating non-oriented silicon steel sheets, the insert block is formed by laminating oriented silicon steel sheets, and the insert block is interference fixed in the insert slot.
[0008] As a further optimization of the above technical solution: the stator yoke is formed by winding and stacking non-oriented silicon steel sheets, the stator teeth are formed by stacking oriented silicon steel sheets, the ends of the stator teeth are provided with a plurality of snap structures, and the outer peripheral surface of the stator yoke is provided with a plurality of slot structures corresponding to the snap structures, and after the stator yoke and the stator teeth are respectively formed, the snap structures are snapped into the slot structures.
[0009] As a further optimization of the above technical solution: the snap-on structure includes a groove and a first mounting foot and a second mounting foot located on both sides of the groove, the slot structure includes a protrusion and a first mounting groove and a second mounting groove located on both sides of the protrusion, the protrusion is snapped into the groove, the first mounting foot is snapped into the first mounting groove, and the second mounting foot is snapped into the second mounting groove.
[0010] As a further optimization of the above technical solution: a first arc-shaped notch is formed on the second mounting foot, a first arc-shaped protrusion is formed on the bottom of the second mounting groove, and the first arc-shaped protrusion is located in the first arc-shaped notch.
[0011] As a further optimization of the above technical solution: the groove is dovetail-shaped, the first mounting foot and the second mounting foot are approximately dovetail-shaped, the protrusion is dovetail-shaped, and the first mounting groove and the second mounting groove are approximately dovetail-shaped.
[0012] As a further optimization of the above technical solution: the tails of several stator teeth are connected to each other through a connecting ring to form a stator outer ring, a stator inner ring is arranged inside the connecting ring, and the connecting ring and the stator inner ring together form the stator yoke.
[0013] As a further optimization of the above technical solution: the stator outer ring is formed by winding and laminating oriented silicon steel sheets, the stator inner ring is formed by winding and laminating non-oriented silicon steel sheets, and the stator outer ring is interference-fitted on the stator inner ring.
[0014] As a further optimization of the above technical solution: the inner circumference of the stator outer ring is formed with a plurality of second arc-shaped notches, the outer circumference of the stator inner ring is formed with a plurality of second arc-shaped protrusions, and the second arc-shaped protrusions are located in the second arc-shaped notches.
[0015] A motor comprises the spliced outer rotor stator of the above technical solution.
[0016] As a further optimization of the above technical solution: the motor is used in an electric vehicle.
[0017] Compared with the prior art, the material constituting the stator teeth in the present invention includes oriented silicon steel sheets, which solves the saturation phenomenon of the magnetic flux density of the stator teeth, enhances the magnetic conductivity, reduces the iron loss, and improves the efficiency of the motor; and the direction of the stator magnetic lines of force is consistent with the rolling direction (high magnetic conductivity direction) of the oriented silicon steel sheets, the motor saturation operating point is higher, the motor magnetomotive force is larger, and the torque density per unit volume of the motor is improved; and because of the high magnetic flux density of the oriented silicon steel sheets, under the same stator diameter, while ensuring that the magnetic flux of the stator teeth is sufficient, the tooth width can be reduced, thereby increasing the stator slot area, thereby greatly improving the motor power, reducing temperature rise and copper loss; a variety of stator splicing methods are provided to ensure that the spliced stator has good connection rigidity. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.
[0019] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.
[0020] Figure 3 It is a schematic structural diagram of the second embodiment of the present invention.
[0021] Figure 4 It is a schematic structural diagram of the third embodiment of the present invention. DETAILED DESCRIPTION
[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0023] The following explains terms that may appear in the embodiments of the present invention.
[0024] Oriented silicon steel sheet refers to a silicon steel sheet in which the arrangement of internal grains has a clear direction.
[0025] Non-oriented silicon steel sheet refers to a silicon steel sheet in which the grain arrangement inside the sheet has no clear direction.
[0026] Iron loss: Iron loss refers to the sum of hysteresis loss and eddy current loss per unit mass of ferromagnetic material in alternating and pulsating magnetic fields (residual loss can be ignored), and the unit is W / kg (watt / kilogram). Transformers, generators and motors all have iron loss. Iron loss is one of their energy losses. The reason is that eddy currents are generated inside the iron core during operation. When the eddy currents pass through the iron core, heat energy is generated inside the iron core. This heat energy consumes energy, so it is called iron loss. Iron loss includes hysteresis loss, eddy current loss and residual loss of magnetic materials.
[0027] Magnetic flux density: also known as magnetic flux density, also known as magnetic induction intensity B, which indicates the number of magnetic lines of force that pass vertically through a unit area. It quantitatively reflects the density of magnetic lines of force. The strength of the magnetic field is usually expressed by the magnetic induction intensity "B". The stronger the magnetic field, the larger the value of B, and the denser the magnetic lines of force.
[0028] The motor includes a stator, which is a spliced outer rotor stator. The stator includes a stator core and a winding. The stator core includes a plurality of stator teeth 1, stator slots are formed between adjacent stator teeth 1, and a stator yoke 2 is formed between the bottom of the stator slot and the inner circumference of the stator core. The winding is wound on the stator teeth 1. The material constituting the stator teeth 1 includes oriented silicon steel sheets. The oriented silicon steel sheets have the characteristics of high magnetic density and low iron loss. The stator teeth 1 include oriented silicon steel sheets, which solve the saturation phenomenon of the magnetic density of the stator teeth, reduce iron loss, and improve the efficiency of the motor; and the direction of the stator magnetic lines of force is consistent with the rolling direction (high magnetic permeability direction) of the oriented silicon steel sheets, the motor saturation operating point is higher, the motor magnetomotive force is larger, and the torque density per unit volume of the motor is improved. And because of the high magnetic density of the oriented silicon steel sheets, under the same stator diameter, while ensuring that the magnetic flux of the stator teeth is sufficient, the tooth width can be reduced, thereby increasing the stator slot area, thereby greatly improving the motor power and reducing temperature rise and copper loss. The motor is applied to electric vehicles, and the motor is an outer rotor motor.
[0029] First embodiment: Figure 1 , 2 As shown, the end of the stator tooth 1 is formed with a plurality of buckle structures 3, which include a dovetail groove 31 and a first mounting foot 32 and a second mounting foot 33 located on both sides of the groove 31, the first mounting foot 32 and the second mounting foot 33 are approximately dovetail-shaped, and a first arc-shaped notch 34 is formed on the second mounting foot 33. The outer peripheral surface of the stator yoke 2 is formed with a plurality of slot structures 4 corresponding to the buckle structures 3, the slot structure 4 includes a dovetail-shaped protrusion 41 and a first mounting groove 42 and a second mounting groove 43 located on both sides of the protrusion 41, the first mounting groove 42 and the second mounting groove 43 are approximately dovetail-shaped, and a first arc-shaped protrusion 44 is formed on the bottom of the second mounting groove 43.
[0030] The stator yoke 2 is formed by stamping non-oriented silicon steel sheets, and is formed by winding and laminating, and has low manufacturing cost. The stator teeth 1 are made of oriented silicon steel sheets through a high-speed stamping and laminating process. After the stator yoke 2 and the stator teeth 1 are formed, the buckle structure 3 is inserted into the slot structure 4, the protrusion 41 is inserted into the groove 31, the first mounting foot 32 is inserted into the first mounting groove 42, the second mounting foot 33 is inserted into the second mounting groove 43, and the first arc-shaped protrusion 44 is located in the first arc-shaped notch 34. The first arc-shaped protrusion 44 plays a fool-proof role, which means that the operator can directly and correctly complete the correct operation without paying attention, experience and professional knowledge, that is, when the stator tooth 1 is installed in an error position, for example, the first mounting foot 32 is inserted into the second mounting groove 43, at this time, due to the existence of the first arc-shaped protrusion 44, the stator tooth 1 cannot be installed in place, thereby reminding the operator that the installation position is wrong. The first arc-shaped protrusion 44 ensures that the stator tooth 1 is installed accurately. The oriented stator teeth 1 are spliced onto the non-oriented stator yoke 2, which enhances the magnetic conductivity, reduces the iron loss and improves the performance of the motor.
[0031] Second embodiment: Figure 3 As shown, the tails of several stator teeth 1 are connected to each other through a connecting ring 5 to form a stator outer ring, and a stator inner ring 6 is arranged inside the connecting ring 5. The connecting ring 5 and the stator inner ring 6 together form a stator yoke 2. The inner circumference of the stator outer ring is formed with several second arc-shaped notches 51, and the outer circumference of the stator inner ring 6 is formed with several second arc-shaped protrusions 61. The stator outer ring is formed by stamping, winding and laminating oriented silicon steel sheets, and the manufacturing cost is low. The stator inner ring 6 is formed by stamping, winding and laminating non-oriented silicon steel sheets, and the manufacturing cost is low. After the stator outer ring and the stator inner ring 6 are formed respectively, the stator outer ring is heated to increase the inner diameter of the stator outer ring, and then the stator inner ring 6 is pressed into the stator outer ring, and the second arc-shaped protrusion 61 is located in the second arc-shaped notch 51, so that the stator outer ring and the stator inner ring 6 are interference fit to form a complete stator core. The oriented stator outer ring is mounted on the non-oriented stator inner ring 6. The stator outer ring includes stator teeth 1, that is, the stator teeth 1 are oriented materials, which enhances the magnetic conductivity, reduces iron loss, and improves the performance of the motor. Both the stator outer ring and the stator inner ring are made by winding technology, and the manufacturing cost is greatly reduced. The second arc-shaped protrusion 61 plays a fool-proof role to ensure that the stator inner ring 6 is installed accurately.
[0032] The third embodiment: Figure 4As shown, a plurality of mounting blocks 7 are connected to the stator yoke 2, and insertion slots are formed in the mounting blocks 7. The mounting blocks 7 and the stator yoke 2 are integrally formed to form a stator frame. Insertion blocks 8 are installed in the insertion slots. Insertion blocks 8 and mounting blocks 7 together form stator teeth 1. The stator frame is formed by stamping non-oriented silicon steel sheets, and then wound and laminated, and has low manufacturing cost. Insertion blocks 8 are formed by high-speed stamping and laminating oriented silicon steel sheets. Insertion blocks 8 are part of the stator teeth 1. The oriented insertion blocks 8 enhance the magnetic conductivity, reduce iron loss, and improve the performance of the motor. After the stator frame and the insertion blocks 8 are formed separately, the stator frame is heated to enlarge the size of the insertion slots, and then the insertion blocks 8 are pressed into the insertion slots, so that the stator frame and the insertion blocks 8 are interference fit to form a complete stator core.
[0033] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should fall within the protection scope of the present invention.
Claims
1. A spliced outer rotor stator, comprising a stator core, wherein the stator core comprises a stator yoke (2) and a plurality of stator teeth (1), characterized in that The material constituting the stator teeth (1) includes oriented silicon steel sheets.
2. A spliced outer rotor stator according to claim 1, characterized in that The stator yoke (2) is connected to a plurality of mounting blocks (7), the mounting blocks (7) are provided with insertion grooves, the mounting blocks (7) and the stator yoke (2) are integrally formed to form a stator frame, the insertion grooves are provided with insertion blocks (8), and the insertion blocks (8) and the mounting blocks (7) together form the stator teeth (1); The stator frame is formed by winding and laminating non-oriented silicon steel sheets, the insertion block (8) is formed by laminating oriented silicon steel sheets, and the insertion block (8) is interference-fixed in the insertion slot.
3. The spliced outer rotor stator according to claim 1, characterized in that The stator yoke (2) is formed by winding and laminating non-oriented silicon steel sheets, and the stator teeth (1) are formed by laminating oriented silicon steel sheets. The ends of the stator teeth (1) are provided with a plurality of snap structures (3), and the outer peripheral surface of the stator yoke (2) is provided with a plurality of slot structures (4) corresponding to the snap structures (3). After the stator yoke (2) and the stator teeth (1) are respectively formed, the snap structures (3) are snapped into the slot structures (4).
4. The spliced outer rotor stator according to claim 3, characterized in that The buckle structure (3) comprises a groove (31) and a first mounting foot (32) and a second mounting foot (33) located on both sides of the groove (31); the slot structure (4) comprises a convex block (41) and a first mounting groove (42) and a second mounting groove (43) located on both sides of the convex block (41); the convex block (41) is snapped into the groove (31), the first mounting foot (32) is snapped into the first mounting groove (42), and the second mounting foot (33) is snapped into the second mounting groove (43).
5. The spliced outer rotor stator according to claim 4, characterized in that A first arc-shaped notch (34) is formed on the second mounting foot (33), a first arc-shaped protrusion (44) is formed on the bottom of the second mounting groove (43), and the first arc-shaped protrusion (44) is located in the first arc-shaped notch (34).
6. A spliced outer rotor stator according to claim 4 or 5, characterized in that The groove (31) is in a dovetail shape, the first mounting foot (32) and the second mounting foot (33) are approximately dovetail-shaped, the protrusion (41) is in a dovetail shape, and the first mounting groove (42) and the second mounting groove (43) are approximately dovetail-shaped.
7. The spliced outer rotor stator according to claim 1, characterized in that The tails of a plurality of the stator teeth (1) are connected to each other via a connecting ring (5) to form a stator outer ring, a stator inner ring (6) is arranged inside the connecting ring (5), and the connecting ring (5) and the stator inner ring (6) together form the stator yoke (2); The stator outer ring is formed by winding and laminating oriented silicon steel sheets, the stator inner ring (6) is formed by winding and laminating non-oriented silicon steel sheets, and the stator outer ring is interference-fitted on the stator inner ring (6).
8. The spliced outer rotor stator according to claim 7, characterized in that The inner circumference of the stator outer ring is formed with a plurality of second arc-shaped notches (51), and the outer circumference of the stator inner ring (6) is formed with a plurality of second arc-shaped protrusions (61), wherein the second arc-shaped protrusions (61) are located in the second arc-shaped notches (51).
9. A motor, characterized in that The motor comprises the spliced outer rotor stator as described in any one of claims 1-8.
10. The motor according to claim 9, characterized in that The motor is used in an electric vehicle.