Rotor core structure of permanent magnet synchronous motor

Abstract

The invention relates to a rotor core structure of a permanent magnet synchronous motor, and relates to the technical field of permanent magnet synchronous motors, the rotor core structure of the permanent magnet synchronous motor comprises a magnet yoke piece, a connecting piece, a magnetic steel groove and a magnet yoke hole, the connecting piece is connected with the magnet yoke piece through a connecting assembly, and the connecting assembly comprises a connecting column, the magnet yoke is coaxially arranged on the connecting piece and is inserted into the magnet yoke hole for positioning; and the plurality of connecting screws penetrate through the magnet yoke piece and are in threaded connection with the connecting piece. The magnetic conductive material on the magnetic yoke piece is removed through the magnetic yoke hole, and the connecting piece and the connecting column are made of the non-magnetic conductive metal material, so that the magnetic leakage phenomenon of the bottom of the magnetic steel groove is greatly reduced, meanwhile, the connecting piece and the magnetic yoke piece are connected through the connecting column and the connecting screw, the connecting column, the connecting piece and the magnetic yoke piece are separately produced, and the production efficiency is improved. And the connecting screws are purchasable parts, and the production cost is reduced, so that the motor quality and the production efficiency are simultaneously improved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of permanent magnet synchronous motors, and in particular to a permanent magnet synchronous motor rotor core structure. Background Art

[0002] Small power self-starting permanent magnet synchronous motors are widely used, especially in winding work such as textile, cable, and transportation where high speed stability is required.

[0003] The rotor yoke of this type of motor is made of magnetic conductive material, and the bottom of the yoke magnetic steel slot is connected to the motor shaft by magnetic conductive material. The entire rotor has high strength and a simple manufacturing process. However, due to the magnetic conductive material, the magnetic leakage of the magnetic steel at the bottom of the rotor yoke magnetic steel slot of this structure is large, resulting in a significant reduction in the main magnetic flux value in the air gap, which cannot meet the motor output power and efficiency requirements and reduces the quality of the motor. If other connection structures are used, the connection structure will require more investment and complex assembly during manufacturing, thereby reducing the motor production efficiency and increasing production costs. Summary of the invention

[0004] In order to improve motor quality, production efficiency and reduce production costs, the present application provides a permanent magnet synchronous motor rotor core structure.

[0005] The present application provides a permanent magnet synchronous motor rotor core structure, which adopts the following technical solution: A permanent magnet synchronous motor rotor core structure, comprising a yoke and a connecting member, wherein the yoke is provided with a magnetic steel slot, and the yoke is provided with a yoke hole coaxially connected to the magnetic steel slot, wherein the connecting member is made of a non-magnetic metal material and is connected to the yoke through a connecting assembly and is used to connect to a motor shaft, wherein the connecting assembly comprises: A connecting column is coaxially arranged on the connecting piece and is made of a non-magnetic metal material and is plugged and installed on the yoke hole for positioning; A plurality of connecting screws are arranged in an array around the circumference of the yoke hole and pass through the yoke piece to be threadedly connected with the connecting piece so that the connecting piece is pressed against the yoke piece for positioning.

[0006] By adopting the above technical solution, the yoke hole is used to remove the magnetic conductive material on the yoke part. The connecting column is first plugged into the yoke hole, and then a plurality of connecting screws are passed through the yoke part and threadedly connected to the connecting part, so that the connecting part is pressed against the yoke part for positioning, thereby realizing the connection of the connecting part and the yoke part to form a rotor core structure, and finally the connecting part is connected to the motor shaft.

[0007] The magnetic conductive material on the yoke part is removed through the yoke hole, and the connecting parts and connecting posts are made of non-magnetic metal materials, thereby greatly reducing the magnetic leakage phenomenon at the bottom of the magnetic steel slot. At the same time, the connecting parts and the yoke part are connected by connecting posts and connecting screws. The connecting posts and the connecting parts are produced separately from the yoke part, and the connecting screws are ordinary steel screws, which are procureable parts, thereby improving the convenience of the production process and reducing the production cost, thereby improving the motor quality and production efficiency and reducing the production cost.

[0008] Optionally, the yoke component is provided with a plurality of connection holes for connecting screws to pass through and connected to the yoke holes, and a plurality of the yoke components are stacked and fixedly connected to form a yoke body.

[0009] By adopting the above technical solution, multiple connecting holes are provided for connecting screws to pass through, and multiple connecting holes are connected to the yoke holes. Therefore, during production, the connecting holes and the yoke holes can be processed at one time by a tool, thereby greatly improving the position accuracy between the multiple connecting holes and the yoke holes, and also reducing the production difficulty, making the processing simpler and more accurate, thereby improving the motor quality and production efficiency and reducing the production cost.

[0010] The thickness of the magnetic conductive material is relatively thin, which makes the magnetic conductive material have high magnetic permeability and can effectively conduct the magnetic field. Therefore, a yoke body is formed by fixing multiple thin yoke parts, thereby greatly improving the magnetic conductivity of the yoke body. At the same time, the yoke body can be designed according to the required thickness, which greatly improves the convenience of the process of producing the yoke body of the required thickness, thereby further improving the motor quality and production efficiency and reducing the production cost.

[0011] Optionally, the magnetic steel slots are provided in plurality and each of the magnetic steel slots is located between two adjacent connection holes and has the same angle as that between the two connection holes, and the connection column and the yoke hole are connected by transition fit.

[0012] By adopting the above technical solution, multiple connecting holes and multiple magnetic steel slots can be evenly arranged on the yoke part, so that the center of gravity of the connecting column and the yoke part are consistent after installation, and the connecting column and the yoke hole are connected by transition fit, which further makes the center of gravity of each part uniform after the rotor core is installed, and makes the rotor core smaller after being connected to the motor shaft, thereby improving the motor quality and production efficiency and reducing production costs.

[0013] Optionally, the diameter of the yoke hole is A, the diameter of the connecting column is B, and A≥B, the diameter of the connecting hole is R1, the outer diameter of the connecting screw is R2, and R1≥R2.

[0014] By adopting the above technical solution, the diameter of the connecting column is less than or equal to the diameter of the yoke hole, which makes it easier for the connecting column and the yoke hole to be plugged in and matched, and at the same time, the two fit more precisely, thereby making the accuracy after installation higher; the outer diameter of the connecting screw is less than or equal to the diameter of the connecting hole, which makes it easier for the connecting screw to pass through the connecting hole and be threadedly connected to the connecting piece, while also reducing the probability of the connecting screw shaking in the connecting hole, further improving the motor quality and production efficiency.

[0015] Optionally, the connecting hole is semicircular and connected to the yoke hole through a connecting section, and the width of the connecting section is the same as the diameter of the connecting hole.

[0016] By adopting the above technical solution, when the connecting hole is connected to the yoke hole, the connecting screw is misaligned with the connecting column when connected to the connecting piece. Because the connection between the connecting column and the connecting piece is stepped, the connecting screw can be firmly connected to the connecting piece thread instead of being connected to the connection between the connecting column and the connecting piece, thereby improving the stability of the connecting screw after connection and improving the quality of the motor.

[0017] Optionally, the connecting member is provided with a plurality of positioning posts made of non-magnetic metal material, the positioning posts are inserted into the connecting holes for positioning, and the connecting screws are threadedly connected to the positioning posts for positioning.

[0018] By adopting the above technical solution, since the connecting column and the yoke hole are both cylindrical, the connecting column is plugged into the yoke hole. When the motor shaft drives the connecting part to rotate, the connecting part drives the yoke part to rotate through multiple connecting screws, so that the force is concentrated on the connecting screws, which makes the connecting screws easy to be damaged or even broken, reducing the quality of the motor.

[0019] Multiple positioning columns are inserted and installed on the connecting holes for positioning, and then the connecting screws are threadedly connected to the positioning columns. Therefore, the motor shaft drives the connecting part to rotate, and the rotation of the connecting part drives the yoke part to rotate through the positioning columns, so that the force is concentrated on the multiple positioning columns, which reduces the risk of damage or even breakage of the connecting screws and improves the quality of the motor.

[0020] At the same time, the positioning column and the connecting column are used to ensure the accuracy of the connection with the yoke body. Therefore, purchasing the connecting screws outsourced will not affect the overall accuracy of the rotor core, thereby improving the motor quality and production efficiency while also reducing production costs.

[0021] Optionally, the plurality of positioning posts are all connected to the connecting posts, and the positioning posts are plug-fitted with the connecting holes and connecting sections on the plurality of magnetic yoke parts.

[0022] By adopting the above technical solution, the positioning column is connected to the connecting column, thereby further improving the strength of the positioning column and the connecting column, and improving the quality of the motor; and it also makes it possible to process the two only by processing the outer contour, avoiding the need to use a smaller tool for processing when there is a small gap between the two, greatly improving the convenience of the production process, while improving the quality of the motor and reducing the production cost; The positioning column is plugged into and matched with the connecting holes and connecting sections on multiple yoke parts, so that the positioning column directly drives the multiple yoke parts to rotate, rather than driving some of the yoke parts to rotate, and then driving the yoke parts not connected to the positioning column to rotate through the rotating yoke parts, thereby greatly improving the stability of the rotor core during operation and improving the quality of the motor.

[0023] Optionally, a conical tube-shaped support platform is coaxially fixedly installed at one end of the connecting piece near the connecting column, one end of the support platform is flush with the end of the connecting piece near the connecting column, the diameter of the end near the connecting column is larger than the diameter of the end away from the connecting column, and cooperates with the connecting piece to support the yoke.

[0024] By adopting the above technical solution, the connector is connected to the yoke part through the connecting column, so the strength of the connecting column determines the stability of the rotor core during operation. At the same time, because the connector is connected to the motor shaft, the diameter of the connector needs to be within the diameter range required by the design, that is, the diameter cannot be too large or too small. Therefore, the size of the connector can be regarded as a constant. The diameter of the connecting column must be smaller than the diameter of the connecting part. Therefore, the smaller the diameter difference between the connecting column and the connecting part, the higher the strength. However, the smaller the diameter, the smaller the contact area with the yoke part, which makes the supporting strength of the yoke part insufficient, making it impossible to achieve both the improvement of the strength of the connecting column and the support effect on the yoke part.

[0025] The support platform increases the contact area when supporting the yoke, improves the supporting strength of the yoke, and can increase the diameter of the connecting column at the same time, thereby improving the supporting effect of the yoke and the strength of the rotor core at the same time. Furthermore, the end of the support platform away from the connecting column is smaller, thereby reducing the weight of the support platform. While achieving the above effects, it also reduces the adverse effects of weight on the rotation of the rotor core, thereby improving the quality of the motor.

[0026] Optionally, the connecting column is provided with a guide angle for facilitating plugging and installation into the yoke hole.

[0027] By adopting the above technical solution, the convenience of plugging and installing the connecting column into the yoke hole is improved, and the production efficiency of the motor is improved.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. The magnetic conductive material on the yoke is removed through the yoke hole, and the connecting piece and the connecting column are made of non-magnetic metal materials, thereby greatly reducing the magnetic leakage phenomenon at the bottom of the magnetic steel slot. At the same time, the connecting piece and the yoke are connected by connecting columns and connecting screws. The connecting column and the connecting piece are produced separately from the yoke, and the connecting screws are ordinary steel screws, which are procureable parts, thereby improving the convenience of the production process and reducing the production cost, thereby improving the motor quality and production efficiency and reducing the production cost.

[0029] 2. The yoke body is formed by fixing multiple thin yoke parts, which greatly improves the magnetic conductivity of the yoke body. At the same time, the yoke body can be designed according to the required thickness, which greatly improves the convenience of producing the yoke body of the required thickness, thereby further improving the motor quality and production efficiency and reducing the production cost.

[0030] 3. The positioning column is inserted into the connecting hole and the connecting section for positioning, and then the connecting screw is threadedly connected to the positioning column, so that the connecting part rotates and the yoke part is driven to rotate through the positioning column, so that the force is concentrated on multiple positioning columns, which reduces the risk of damage or even breakage of the connecting screws and improves the quality of the motor; the positioning column and the connecting column are used to ensure the accuracy of the connection with the yoke body, so the purchase of connecting screws will not affect the overall accuracy of the rotor core, thereby improving the motor quality and production efficiency while also reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional structural schematic diagram of the rotor core structure; Figure 2 This is an exploded view of the rotor core structure.

[0032] Figure numerals: 11, yoke part; 12, yoke body; 13, magnetic steel groove; 14, yoke hole; 15, connecting part; 2, connecting assembly; 21, connecting column; 22, connecting screw; 23, supporting platform; 3, connecting hole; 31, connecting section; 32, positioning column. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-2 This application is described in further detail.

[0034] The embodiment of the present application discloses a permanent magnet synchronous motor rotor core structure.

[0035] Reference Figure 1The permanent magnet synchronous motor rotor core structure includes a yoke 11 and a connecting member 15. The yoke 11 is made of a magnetic conductive metal material, and the yoke 11 is provided with a plurality of magnetic steel slots 13 in a circular array around its own axis. The magnetic steel slots 13 are provided along the radial direction of the yoke 11 and penetrate the yoke 11 along the axial direction of the yoke 11. The yoke 11 is disc-shaped, and a yoke hole 14 is coaxially provided on the yoke 11 and penetrates the yoke 11 along the axial direction of the yoke 11. The yoke hole 14 is connected with one end of the magnetic steel slot 13 close to the center of the yoke 11; the connecting member 15 is cylindrical and made of a non-magnetic conductive metal material. The connecting member 15 is connected to the yoke 11 through a connecting assembly 2 to form a rotor core, and the connecting member 15 is used to connect to the motor shaft.

[0036] Reference Figure 1 and Figure 2 A plurality of yoke parts 11 are stacked and fixedly connected with each other, and the fixing method may be riveting or other methods. When the magnetic conductive material is thin, it is convenient to manufacture and has better magnetic conductivity. Therefore, a plurality of thinner yoke parts 11 are combined to form a yoke body 12 of required thickness. At the same time, the yoke body 12 can be fixedly connected according to the thickness requirements, which improves the convenience during production, thereby improving the quality and production efficiency at the same time.

[0037] The connecting assembly 2 includes a connecting column 21 and a plurality of connecting screws 22. The connecting column 21 is coaxially fixedly installed on one end of the connecting member 15, and the diameter of the connecting column 21 is smaller than the diameter of the connecting member 15, and the diameter of the connecting column 21 is infinitely close to the diameter of the connecting member 15. The specific size of the connecting column 21 can be obtained according to the design; a support platform 23 is coaxially fixedly installed on the outer wall of the connecting member 15 near one end of the connecting column 21, and one end of the support platform 23 is flush with the end of the connecting member 15 near the connecting column 21. The support platform 23 is in a conical tube shape and the diameter of the end near the connecting column 21 is greater than the diameter of the end away from the connecting column 21.

[0038] The connecting column 21 is installed on the yoke hole 14 through a transition fit, so that the yoke 11 is supported and positioned against the connecting member 15 and the support platform 23; at the same time, the connection between the connecting column 21 and the yoke hole 14 can also be a clearance fit or an interference fit. The diameter of the yoke hole 14 is A, the diameter of the connecting column 21 is B, and A≥B. The optimal A and B are equal, that is, the actual tolerance between A and B is extremely small and almost equal, so that the plug-in fit accuracy of the connecting column 21 and the yoke hole 14 is the best, and the actual tolerance is obtained according to the design.

[0039] The yoke part 11 is provided with a connecting hole 3 between two adjacent magnetic steel slots 13, and the connecting hole 3 is annular and connected to the yoke hole 14 through a connecting section 31. The connecting hole 3 and the connecting section 31 both penetrate the yoke part 11 along the axial direction of the yoke part 11; the width of the connecting section 31 is the same as the diameter of the connecting hole 3, and the two side walls of the connecting section 31 are tangent to the connecting hole 3; at the same time, the angles between the connecting hole 3 and the two adjacent magnetic steel slots 13 are the same, so that multiple connecting holes 3 and multiple magnetic steel slots 13 are evenly distributed on the yoke part 11.

[0040] Positioning posts 32 are integrally provided on the connector 15 and at multiple connecting holes 3. Multiple positioning posts 32 are integrally provided with the connecting posts 21. The positioning posts 32, the connecting posts 21 and the connector 15 are all made of the same material and are processed at one time by a tool, thereby greatly reducing the magnetic leakage phenomenon and improving the coaxiality and strength among the three, making the processing simple and stable, while also improving the convenience of the processing. The connecting screws 22 are standard parts that can be purchased in a unified manner, and the connection accuracy with the yoke body 12 is guaranteed by the positioning posts 32 and the connecting posts 21. Therefore, the purchase of the connecting screws 22 will not affect the overall accuracy of the rotor core, thereby improving the motor quality and production efficiency while also reducing production costs.

[0041] A plurality of positioning posts 32 are arranged in one-to-one correspondence with the plurality of connecting holes 3, and the positioning posts 32 are plugged and installed on the connecting holes 3 and the connecting sections 31. At the same time, the positioning posts 32 are plugged and matched with the connecting holes 3 and the connecting sections 31 at the same position on the plurality of yoke parts 11, so that the positioning posts 32 extend away from the end of the connecting part 15 to the connecting hole 3 farthest from the connecting part 15; a plurality of connecting screws 22 are arranged in one-to-one correspondence with the plurality of positioning posts 32, the connecting screws 22 pass through the connecting holes 3 and are threadedly connected to the positioning posts 32, the heads of the connecting screws 22 are pressed against the yoke part 11, and the yoke part 11 is also pressed against the connecting part 15 and the support platform 23 for positioning. When connecting, the plurality of connecting screws 22 are first twisted one by one with a small force, and then the force is continued to be increased to twist the plurality of connecting screws 22 in sequence until the plurality of connecting screws 22 are tightened.

[0042] The diameter of the connecting hole 3 is R1, the outer diameter of the connecting screw 22 is R2, R1 ≥ R2, and the diameter of R1 can be 1.3 cm; the positioning column 32 and the connecting column 21 are provided with guide angles at one end away from the connecting piece 15, which facilitates the positioning column 32 and the connecting column 21 to be respectively plugged and installed into the connecting hole 3 and the yoke hole 14.

[0043] The precision of the connector 15, the connecting column 21 and the positioning column 32 is manufactured according to the design requirements to ensure the connection strength and the runout of the rotor core. At the same time, the torque of the rotor core is tested. With a static torque value of 20 times the design torque of the rotor core, the connector 15 and the yoke body 12 are tested for movement for 24 hours to ensure the reliability of the rotor core during operation.

[0044] The working principle of the embodiment of the present application is as follows: According to the thickness design requirements, a corresponding number of yoke parts 11 are fixedly connected by rivets, and then the connecting column 21 is plugged into the yoke hole 14 and the positioning column 32 is plugged into the connecting hole 3 and the connecting section 31, so that the yoke part 11 is positioned against the support platform 23 and the connecting part 15, and a plurality of connecting screws 22 are threadedly connected to the plurality of positioning columns 32 through the connecting hole 3, so as to fix the connecting part 15 and the yoke body 12 to obtain the rotor core, and finally the rotor core is connected to the electronic shaft.

[0045] The magnetic conductive material is eliminated through the yoke hole 14, the connecting hole 3 and the connecting section 31, and the connecting piece 15, the connecting column 21 and the positioning column 32 are all made of non-magnetic metal materials, thereby reducing the probability of magnetic leakage in the magnetic steel slot 13. At the same time, the yoke body 12 is processed separately, and the connecting piece 15, the connecting column 21 and the positioning column 32 are processed separately, and the connecting screw 22 is purchased, thereby greatly improving the quality and production efficiency of the motor and reducing the production cost.

[0046] When the connecting member 15 rotates, the multiple yoke members 11 are driven to rotate through the multiple positioning columns 32, so that the force is concentrated on the positioning columns 32 rather than the connecting screws 22, thereby reducing the risk of damage or even breakage of the connecting screws 22. Furthermore, the support platform 23 cooperates to increase the contact area with the yoke member 11, and also increases the diameter of the connecting column 21, thereby being able to simultaneously improve the support effect and connection strength of the yoke member 11, thereby further improving the quality of the motor.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A permanent magnet synchronous motor rotor core structure, characterized in that: The invention comprises a yoke component (11) and a connecting component (15), wherein the yoke component (11) is provided with a magnetic steel slot (13), and the yoke component (11) is provided with a yoke hole (14) coaxially connected to the magnetic steel slot (13), wherein the connecting component (15) is made of a non-magnetic metal material and is connected to the yoke component (11) via a connecting component (2) and is used to be connected to a motor shaft, wherein the connecting component (2) comprises: A connecting column (21) is coaxially arranged on the connecting piece (15), is made of a non-magnetic metal material, and is plugged and installed on the yoke hole (14) for positioning; A plurality of connecting screws (22) are arranged in a circumferential array around the yoke hole (14) and pass through the yoke piece (11) to be threadedly connected to the connecting piece (15) so that the connecting piece (15) is pressed against the yoke piece (11) for positioning; The yoke piece (11) is provided with a plurality of connection holes (3) for connecting screws (22) to pass through and connected to the yoke holes (14); a plurality of the yoke pieces (11) are stacked and fixedly connected to form a yoke body (12); The connecting piece (15) is provided with a plurality of positioning posts (32) made of non-magnetic metal material, the positioning posts (32) are inserted into the connecting holes (3) for positioning, and the connecting screws (22) are threadedly connected to the positioning posts (32) for positioning.

2. The permanent magnet synchronous motor rotor core structure according to claim 1, characterized in that: The magnetic steel slots (13) are provided with a plurality of them, and each magnetic steel slot (13) is located between two adjacent connection holes (3) and has the same angle as the angle between the two connection holes (3); the connection column (21) and the yoke hole (14) are connected by means of transition fit.

3. The permanent magnet synchronous motor rotor core structure according to claim 2, characterized in that: The diameter of the yoke hole (14) is A, the diameter of the connecting column (21) is B, and A≥B, the diameter of the connecting hole (3) is R1, the outer diameter of the connecting screw (22) is R2, and R1≥R2.

4. A permanent magnet synchronous motor rotor core structure according to any one of claims 1 to 3, characterized in that: The connecting hole (3) is in a semicircular ring shape and is connected to the yoke hole (14) via a connecting section (31); the width of the connecting section (31) is the same as the diameter of the connecting hole (3).

5. The permanent magnet synchronous motor rotor core structure according to claim 1, characterized in that: The plurality of positioning posts (32) are all connected to the connecting posts (21), and the positioning posts (32) are plug-fitted with the connecting holes (3) and the connecting sections (31) on the plurality of magnetic yoke parts (11).

6. The permanent magnet synchronous motor rotor core structure according to claim 1, characterized in that: A conical tube-shaped support platform (23) is coaxially fixedly mounted on one end of the connecting piece (15) close to the connecting column (21); one end of the support platform (23) is flush with the end of the connecting piece (15) close to the connecting column (21); the diameter of the end close to the connecting column (21) is larger than the diameter of the end away from the connecting column (21); and the support platform (23) cooperates with the connecting piece (15) to support the yoke piece (11).

7. The permanent magnet synchronous motor rotor core structure according to claim 1, characterized in that: The connecting column (21) is provided with a guide angle for easy insertion and installation into the yoke hole (14).

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