Rotor assembly of variable pitch motor

Abstract

The invention relates to a rotor assembly of a variable-pitch motor. The rotor assembly comprises a rotating shaft and a rotor assembly formed by stacking a plurality of punching sheet bodies, the punching sheet bodies are provided with shaft holes, and the rotating shaft penetrates through the shaft holes of all the punching sheet bodies and is fixedly connected with all the punching sheet bodies. A plurality of circumferentially arranged rectangular magnetic steel grooves are formed between the outer circumferential wall of the punching sheet body and the inner circumferential wall of the shaft hole, the magnetic steel grooves are arranged along the axial direction of the punching sheet body in a penetrating manner, and magnetic steel matched with the magnetic steel grooves is embedded into the magnetic steel grooves; ventilation grooves are formed in the two side edges, in the circumferential direction of the punching sheet body, of the magnetic steel grooves, and the ventilation grooves penetrate through the rotor assembly in the axial direction of the rotor assembly. The area, located between two adjacent magnetic steel grooves, of the punching sheet body is a breathable magnetic bridge area, and a magnetic bridge with the same width in the radial direction of the punching sheet body is formed between the groove walls of two breathable grooves in the breathable magnetic bridge area. The magnetic bridges are consistent in width, so that the strength of the magnetic bridges is ensured, and the overall mechanical property of the punching sheet body is also ensured.

Description

Technical Field

[0001] The invention relates to the field of variable pitch motors, and in particular to a rotor assembly of a variable pitch motor. Background Art

[0002] The variable pitch motor can be used in wind turbine generators to control the rotation of the corresponding blades, so as to change the windward surface of the blades and the natural wind and realize the revolution of the blades. Pitch motors are conventionally installed at high altitudes. Due to the large temperature difference in working conditions at high altitudes, for example, at high temperatures, the rotor inside the motor is very likely to generate high temperatures. High temperatures have a huge impact on the magnetic force of the magnets. How to achieve heat dissipation for the rotor and magnets has become an urgent problem that researchers in this field need to solve. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to achieve heat dissipation of the rotor and magnetic steel; In order to solve the above technical problems, the technical solution adopted by the present invention is: The present invention is a rotor assembly of a variable pitch motor, comprising a rotating shaft and a rotor assembly formed by stacking a plurality of the punching bodies; the punching bodies have an axial hole, the rotating shaft passes through the axial holes of all the punching bodies, and is fixedly connected to each of the punching bodies; a plurality of circumferentially arranged rectangular magnetic steel grooves are provided between the outer circumferential wall of the punching body and the inner circumferential wall of the axial hole, the magnetic steel grooves are arranged to pass through along the axial direction of the punching body, and magnetic steels matching therewith are embedded in the magnetic steel grooves; the magnetic steel grooves are provided with air-permeable grooves on both sides of the circumferential side of the punching body, and the air-permeable grooves pass through the rotor assembly along the axial direction of the rotor assembly; the area of ​​the punching body between two adjacent magnetic steel grooves is an air-permeable magnetic bridge area, and a magnetic bridge with a consistent width along the radial direction of the punching body is formed between the groove walls of the two air-permeable grooves in the air-permeable magnetic bridge area.

[0004] In this solution, rectangular magnetic steel grooves are provided at equal intervals on the circumference of the punch body, and ventilation grooves are provided outwardly on both sides of the magnetic steel grooves; when multiple punches are stacked, the ventilation grooves and the ventilation grooves form a heat dissipation channel provided along the axial direction of the punch body, and the heat generated by the punch and the magnetic steel is discharged through the heat dissipation channel, thereby realizing the heat dissipation of the motor; The air-permeable groove wall at the end of the magnetic steel groove forms a magnetic bridge with the same width with the air-permeable groove wall at the end of the other magnetic steel groove, which is different from the magnetic bridge being a gradually widening or narrowing structure, thus ensuring the strength of the magnetic bridge and the overall mechanical properties of the punch body; In order to prevent the movement of the magnetic steel in the magnetic steel groove, the present invention adopts the two inner walls of the air permeable groove in the radial direction of the punch body to be distributed as the radial outer wall of the air permeable groove and the radial inner wall of the air permeable groove, and in the radial direction of the punch body, the radial outer wall of the air permeable groove is located on the outside of the radial inner wall of the air permeable groove; the two inner walls of the magnetic steel groove in the radial direction of the punch body are distributed as the radial outer wall of the magnetic steel groove and the radial inner wall of the magnetic steel groove, and in the radial direction of the punch body, the radial outer wall of the magnetic steel groove is located on the outside of the radial inner wall of the magnetic steel groove; in the radial direction of the punch body, the radial inner wall of the air permeable groove is located on the outside of the radial inner wall of the magnetic steel groove, so as to form a limiting surface connected between the radial inner wall of the air permeable groove and the radial inner wall of the magnetic steel groove; the magnetic steel in the magnetic steel groove is in contact with the limiting surface.

[0005] A vent groove is formed between the radial outer wall of the vent groove, the radial inner wall of the vent groove, and the vent groove wall. In the radial direction of the punch body, the radial outer wall of the vent groove is located outside the radial inner wall of the vent groove. The radial outer wall of the magnetic steel groove and the radial inner wall of the magnetic steel groove are the length sides of the rectangular magnetic steel groove. In the radial direction of the punch body, the radial outer wall of the magnetic steel groove is located outside the radial inner wall of the air permeable groove; In the radial direction of the punch body, the radial inner wall of the air permeable groove is located outside the radial inner wall of the magnetic steel groove. The radial inner wall of the air permeable groove and the outer side of the radial inner wall of the magnetic steel groove are connected by the width edge of the magnetic steel groove, and the width edge is a limiting surface that abuts against the side surface of the magnetic steel.

[0006] In order to ensure the accuracy of positioning between the rotors during the stacking of the punching bodies, the present invention adopts a method of providing a plurality of weight-reducing holes in the middle of the punching body along its circumferential direction; one of the weight-reducing holes extends outward to form an anti-mistake groove; In this solution, the weight-reducing holes reduce the deadweight of the punch body, and an anti-foolproof groove is provided at one of the weight-reducing holes. The anti-foolproof groove is used for positioning during the stacking of the punch bodies. That is, when two punch bodies are stacked, the anti-foolproof grooves of the corresponding punch bodies are in the upper and lower positions for stacking and installation.

[0007] During the production process of the punch body, the inner ring where the punch body and the rotating shaft cooperate is under great stress. In order to prevent the punch body from being damaged due to stress concentration during the cooperation between the punch body and the rotating shaft, the present invention adopts a plurality of notches on the inner wall of the circumference of the shaft hole of the punch body; In order to illustrate the specific structure of the notch, the present invention adopts the notch to be in the shape of an arc; In this solution, an arc-shaped notch is provided at the axial hole of the punch body, and the notch can avoid stress concentration at the axial hole of the punch body.

[0008] In order to further illustrate the specific structure of the magnetic steel groove, the present invention adopts the ventilation groove to gradually decrease in width along the radial direction of the punching sheet body inward.

[0009] Beneficial effects of the present invention: The present invention is a rotor assembly of a variable pitch motor, wherein rectangular magnetic steel grooves are provided at equal intervals on the circumference of a punching sheet body, and air-permeable grooves are provided outwardly on both sides of the magnetic steel grooves; when a plurality of punching sheets are stacked, the air-permeable grooves and the air-permeable grooves form a heat dissipation channel, and the heat generated by the punching sheets and the magnetic steel is discharged through the heat dissipation channel to achieve heat dissipation of the motor; a magnetic bridge with a uniform width along the radial direction of the punching sheet body can effectively limit the leakage path of the magnetic flux, so that the magnetic flux passes through the rotor assembly according to the designed path, thereby reducing magnetic leakage, so that more magnetic flux can be used to generate torque or energy conversion; it can also improve the uniformity of the magnetic field in the rotor assembly, and reduce the vibration and torque fluctuation of the rotor assembly caused by the uneven magnetic field; it can also make the stress distribution in various parts of the magnetic bridge more uniform, avoid fatigue fracture of the magnetic bridge, and ensure the stability of the operation of the rotor assembly; since the air-permeable groove passes through the magnetic bridge, for the relatively weak magnetic bridge, the heat of the magnetic bridge can be directly diffused outward along the air-permeable groove, avoiding the magnetic bridge from stretching or contracting due to the influence of thermal stress, and thus the risk of fracture of the magnetic bridge, thereby extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the punch body; Figure 3 yes Figure 2 A magnified image of point A; Figure 4 It is a diagram of the coordination between the present invention, magnetic steel and rotating shaft; In the figure: 1. punching sheet body; 002. rotor assembly; 2. magnetic steel slot; 21. radial inner wall of magnetic steel slot; 22. radial outer wall of magnetic steel slot; 3. air permeable slot; 31. slot wall; 32. radial inner wall of air permeable slot; 33. radial outer wall of air permeable slot; 4. magnetic bridge; 5. limiting surface; 6. weight reduction hole; 7. anti-fool groove; 8. rotating shaft; 9. notch; 10. magnetic steel; 11. shaft hole. DETAILED DESCRIPTION

[0012] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0013] like Figure 1 , 4As shown, the present invention is a rotor assembly of a variable pitch motor, comprising a rotating shaft 8 and a rotor component 002 formed by stacking a plurality of the punching bodies 1; the punching body 1 has an axial hole 11, the rotating shaft 8 passes through the axial holes 11 of all the punching bodies 1, and is fixedly connected to each of the punching bodies 1; a plurality of circumferentially arranged rectangular magnetic steel slots 2 are provided between the outer circumferential wall of the punching body 1 and the inner circumferential wall of the axial hole 11, the magnetic steel slots 2 are arranged through-through along the axial direction of the punching body 1, and magnetic steels 10 matching therewith are embedded in the magnetic steel slots 2; the magnetic steel slots 2 are provided with air-permeable grooves 3 on both sides of the circumferential side of the punching body 1, and the air-permeable grooves 3 pass through the rotor component 002 along the axial direction of the rotor component 002; the area of ​​the punching body 1 between two adjacent magnetic steel slots 2 is an air-permeable magnetic bridge area, and a magnetic bridge 4 with a uniform width along the radial direction of the punching body 1 is formed between the groove walls 31 of the two air-permeable grooves 3 in the air-permeable magnetic bridge area.

[0014] In this solution, rectangular magnetic steel grooves 2 are provided at equal intervals on the circumference of the punch body 1, and ventilation grooves 3 are provided outwardly on both sides of the magnetic steel grooves 2; when multiple punch bodies 1 are stacked, the ventilation grooves 3 and the ventilation grooves 3 form a heat dissipation channel provided along the axial direction of the punch body 1, and the heat generated by the punch body 1 and the magnetic steel 10 is discharged through the heat dissipation channel, thereby realizing the heat dissipation of the motor; The groove wall 31 of the air-permeable groove 3 at the end of the magnetic steel groove 2 forms a magnetic bridge 4 with the same width as the groove wall 31 of the air-permeable groove 3 at the end of the other magnetic steel groove 2. The difference between the magnetic bridge 4 and the gradually widening or narrowing structure ensures the strength of the magnetic bridge 4 and the overall mechanical properties of the punch body 1. The magnetic bridge 4 with a uniform width in the radial direction of the punching sheet body 1 can effectively limit the leakage path of the magnetic flux, so that the magnetic flux passes through the rotor assembly 002 according to the designed path, thereby reducing magnetic leakage, so that more magnetic flux can be used to generate torque or energy conversion; it can also improve the uniformity of the magnetic field in the rotor assembly 002, and reduce the vibration and torque fluctuation of the rotor assembly caused by the uneven magnetic field; it can also make the stress distribution in various parts of the magnetic bridge 4 more uniform, avoid fatigue fracture of the magnetic bridge 4, and ensure the stability of the operation of the rotor assembly; Since the air permeable groove 3 passes through the magnetic bridge 4, for the relatively weak magnetic bridge 4, the heat of the magnetic bridge 4 can be directly diffused outward along the air permeable groove 3, thereby avoiding the risk of the magnetic bridge 4 breaking due to stretching or contraction caused by thermal stress, thereby extending the service life of the motor.

[0015] like Figure 3As shown, in order to prevent the movement of the magnetic steel 10 in the magnetic steel groove 2, the present invention adopts the two inner walls of the air permeable groove 3 in the radial direction of the punch body 1 to be distributed as the radial outer wall 33 of the air permeable groove and the radial inner wall 32 of the air permeable groove, and in the radial direction of the punch body 1, the radial outer wall 33 of the air permeable groove is located on the outside of the radial inner wall 32 of the air permeable groove; the two inner walls of the magnetic steel groove 2 in the radial direction of the punch body 1 are distributed as the radial outer wall 22 of the magnetic steel groove and the radial inner wall 21 of the magnetic steel groove, and in the radial direction of the punch body 1, the radial outer wall 22 of the magnetic steel groove is located on the outside of the radial inner wall 21 of the magnetic steel groove; in the radial direction of the punch body 1, the radial inner wall 32 of the air permeable groove is located on the outside of the radial inner wall 21 of the magnetic steel groove, so as to form a limiting surface 5 connected between the radial inner wall 32 of the air permeable groove and the radial inner wall 21 of the magnetic steel groove; the magnetic steel 10 in the magnetic steel groove 2 is in contact with the limiting surface 5.

[0016] The air-permeable groove 3 is formed between the radial outer wall 33 of the air-permeable groove, the radial inner wall 32 of the air-permeable groove, and the groove wall 31 of the air-permeable groove. In the radial direction of the punch body 1, the radial outer wall 33 of the air-permeable groove is located outside the radial inner wall 32 of the air-permeable groove. The radial outer wall 22 of the magnetic steel groove and the radial inner wall 21 of the magnetic steel groove are the length sides of the rectangular magnetic steel groove 2. In the radial direction of the punch body 1, the radial outer wall 22 of the magnetic steel groove is located outside the radial inner wall 32 of the air permeable groove. In the radial direction of the punch body 1, the radial inner wall 32 of the air permeable groove is located outside the radial inner wall 21 of the magnetic steel groove, and the radial inner wall 32 of the air permeable groove and the radial inner wall 21 of the magnetic steel groove are connected. This is the width edge of the magnetic steel groove 2, and the width edge is against the side of the magnetic steel 10 to form a limiting surface 5.

[0017] like Figure 2 As shown, in order to ensure the accuracy of positioning between the rotors during the stacking process of the punching body 1, the present invention adopts a plurality of weight-reducing holes 6 arranged in the middle of the punching body 1 along its circumferential direction; one of the weight-reducing holes 6 extends outward to form an anti-fool groove 7; In the present solution, the weight-reducing holes 6 reduce the deadweight of the punch body 1, and an anti-foolproof groove 7 is provided at one of the weight-reducing holes 6. The anti-foolproof groove 7 is used for positioning during the stacking process of the punch bodies 1. That is, when two punch bodies 1 are stacked, the anti-foolproof grooves 7 of the corresponding punch bodies 1 are in corresponding upper and lower positions before they can be stacked and installed.

[0018] like Figure 2 As shown, during the production process of the punch body 1, the inner circle where the punch body 1 and the rotating shaft 8 are matched has a large stress. In order to prevent the punch body 1 from being damaged due to stress concentration during the matching between the punch body 1 and the rotating shaft 8, the present invention adopts a plurality of notches 9 on the inner wall of the circumference of the shaft hole 11 of the punch body 1; In order to illustrate the specific structure of the notch 9, the present invention adopts that the notch 9 is in an arc shape; In this solution, an arc-shaped notch 9 is provided at the axial hole 11 of the punch body 1 , and the notch 9 can avoid stress concentration at the axial hole 11 of the punch body 1 .

[0019] like Figure 3 As shown, in order to further illustrate the specific structure of the magnetic steel groove, the present invention adopts the ventilation groove 3 to gradually reduce its width inward along the radial direction of the punching sheet body 1.

Claims

1. A rotor assembly of a variable pitch motor, characterized in that: It comprises a rotating shaft (8) and a rotor assembly (002) formed by stacking a plurality of the punching sheet bodies (1); The punch body (1) has an axial hole (11), and the rotating shaft (8) passes through the axial holes (11) of all the punch bodies (1) and is fixedly connected to each of the punch bodies (1); A plurality of circumferentially arranged rectangular magnetic steel grooves (2) are provided between the outer circumferential wall of the punch body (1) and the inner circumferential wall of the shaft hole (11); the magnetic steel grooves (2) are arranged to penetrate the punch body (1) in the axial direction, and magnetic steels (10) matching therewith are embedded in the magnetic steel grooves (2); The magnetic steel slot (2) is provided with air-permeable slots (3) on both sides of the punch body (1) in the circumferential direction, and the air-permeable slot (3) penetrates the rotor assembly (002) along the axial direction of the rotor assembly (002); the area of ​​the punch body (1) between two adjacent magnetic steel slots (2) is an air-permeable magnetic bridge area, and a magnetic bridge (4) with a uniform width in the radial direction of the punch body is formed between the slot walls (31) of the two air-permeable slots (3) in the air-permeable magnetic bridge area.

2. The rotor assembly of a variable pitch motor according to claim 1, characterized in that: The two inner walls of the vent groove (3) in the radial direction of the punch body (1) are distributed as a vent groove radial outer wall (33) and a vent groove radial inner wall (32); in the radial direction of the punch body (1), the vent groove radial outer wall (33) is located outside the vent groove radial inner wall (32); The two inner walls of the magnetic steel groove (2) in the radial direction of the punch body (1) are distributed as a magnetic steel groove radial outer wall (22) and a magnetic steel groove radial inner wall (21); in the radial direction of the punch body (1), the magnetic steel groove radial outer wall (22) is located outside the magnetic steel groove radial inner wall (21); In the radial direction of the punch body (1), the radial inner side wall (32) of the air permeable groove is located outside the radial inner side wall (21) of the magnetic steel groove, so as to form a limiting surface (5) connected between the radial inner side wall (32) of the air permeable groove and the radial inner side wall (21) of the magnetic steel groove; The magnetic steel (10) in the magnetic steel slot (2) is in contact with the limiting surface (5).

3. The rotor assembly of a variable pitch motor according to claim 1, characterized in that: A plurality of weight-reducing holes (6) are arranged in the middle of the punch body (1) along its circumferential direction; The weight-reducing hole (6) is located between the magnetic steel slot (2) and the shaft hole (11); One of the weight-reducing holes (6) extends outward to form an anti-mistake groove (7).

4. The rotor assembly of a variable pitch motor according to claim 1, characterized in that: A plurality of notches (9) are provided on the circumferential inner wall of the axial hole (11) of the punch body (1).

5. The rotor assembly of a variable pitch motor according to claim 4, characterized in that: The notch (9) is in an arc shape.

6. The rotor assembly of a variable pitch motor according to claim 1, characterized in that: The width of the vent groove (3) gradually decreases inwardly along the radial direction of the punch body (1).

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