Rotor components, motors, industrial equipment

Abstract

The present invention provides a rotor assembly, a motor, and industrial equipment. The rotor assembly includes at least two rotor assembly monomers, the rotor assembly monomers include a rotor core with a shaft hole and a shaft segment inserted into the shaft hole and connected to the rotor core as a whole, the first end of the shaft segment has a connecting protrusion protruding from the first axial end face of the rotor core, the second end of the shaft segment has a connecting recessed in the second axial end face of the rotor core, and one of the two rotor assembly monomers is axially connected to the other through its connecting protrusion and forms a circumferential rotation restriction through its connecting recess. According to a rotor assembly, motor, and industrial equipment of the present invention, the rotor assembly can be assembled in a modular manner to improve assembly efficiency, and the versatility and diversity of the rotor assembly can be improved while achieving rotor skew to reduce motor noise.

Description

Technical Field

[0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a rotor assembly, a motor, and industrial equipment. Background Art

[0002] With the current trend of increasing the scale of general and serialized production of permanent magnet motors, they have become the core components of industrial robots and CNC centers, and the demand for motors in the market has increased. From the research on the application scenarios of permanent magnet motors, it can be seen that they mainly need to meet the requirements of general purpose, high precision, high speed and low noise. Among them, the harm caused by motor noise will seriously affect the service life and precision of the machine when the permanent magnet motor is used in industrial occasions.

[0003] Slanting the motor rotor is a common method in the industry that can effectively reduce motor noise. For example, one current method is to design the motor rotor in sections along its axial direction, and the permanent magnets in the rotor cores at the two adjacent ends are deflected at a certain angle in the circumferential direction to form slanted poles, so as to reduce the motor's cogging torque and torque pulsation and reduce the vibration noise of the motor and the compressor used. However, this current method has the following shortcomings:

[0004] (1) The segmented rotors need to be connected by rivets, screws or rivet point stamping, which limits the adjustability of the skew angle and cannot be disassembled and reassembled, reducing the versatility of the rotor;

[0005] (2) Rotors with different connection lengths need to match different motor shafts, and the motor shafts of rotors with different powers are not universal. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to provide a rotor assembly, a motor, and industrial equipment, which can assemble the rotor assembly in a modular manner to improve assembly efficiency, and can also improve the versatility and diversity of the rotor assembly while achieving rotor skew to reduce motor noise.

[0007] In order to solve the above problems, the present invention provides a rotor assembly, comprising at least two rotor assembly monomers, the rotor assembly monomers comprising a rotor core having a shaft hole and a shaft segment inserted in the shaft hole and connected to the rotor core as a whole, the first end of the shaft segment having a connecting protrusion protruding from the first axial end surface of the rotor core, the second end of the shaft segment having a connecting recess recessed in the second axial end surface of the rotor core, one of the two rotor assembly monomers forms an axial connection with the other through its connecting protrusion and forms a circumferential rotation restriction.

[0008] Preferably, the connecting protrusion is a cylindrical boss, and a plurality of convex teeth are provided on the outer circumferential wall of the cylindrical boss, and the plurality of convex teeth are evenly spaced along the circumference of the cylindrical boss; the connecting recess is a cylindrical concave hole, and a plurality of concave teeth are provided on the inner circumferential wall of the cylindrical concave hole, and the plurality of concave teeth are matched with the plurality of convex teeth.

[0009] Preferably, the rotor assembly further has angle scale lines, and the angle scale lines are arranged on the outer peripheral walls at both axial ends of the rotor core along the circumferential direction of the rotor core.

[0010] Preferably, the connecting protrusion is a non-cylindrical boss, and the connecting recess is matched with the non-cylindrical boss.

[0011] Preferably, when projected on a radial plane of the rotor core, the projection of the non-cylindrical boss is in one of the shapes of I-shape, H-shape, cross-shape, triangle, polygon and ellipse.

[0012] Preferably, the connecting protrusion and the connecting recess are respectively connected to a rotation limiting member, and also include a rotating shaft connector, the rotating shaft connector has a first connecting groove and a second connecting groove matching the rotation limiting member, the first connecting groove and the second connecting groove are respectively located at the axial ends of the rotating shaft connector, and a preset deflection angle is formed between the first connecting groove and the second connecting groove in the circumferential direction of the rotor core, and the rotation limiting member can be inserted into the first connecting groove and the second connecting groove.

[0013] Preferably, the rotation limiting member is connected to the connecting protrusion by interference fit; and / or the rotation limiting member is connected to the connecting protrusion of the connecting recess by interference fit.

[0014] Preferably, the rotor assembly further includes a first support shaft segment and a second support shaft segment, the first support shaft segment forming a detachable connection with a connecting protrusion of a rotor assembly monomer adjacent to the rotor assembly, and the second support shaft segment forming a detachable connection with a connecting recess of a rotor assembly monomer adjacent to the rotor assembly.

[0015] The present invention also provides a motor, comprising the above-mentioned rotor assembly.

[0016] The present invention also provides an industrial equipment, comprising the above-mentioned motor.

[0017] The present invention provides a rotor assembly, a motor, and industrial equipment, wherein a plurality of rotor assembly monomers are completely identical in structural construction, and the rotor assembly can achieve axial connection and circumferential rotation limitation through the connecting protrusions and connecting recesses respectively possessed by the plurality of rotor assembly monomers, thereby enabling the rotor assembly to be assembled in a modular manner, greatly improving assembly efficiency. At the same time, the skew pole requirement of the rotor assembly is achieved through relative rotation between two adjacent rotor assembly monomers, thereby achieving reduction in motor noise. In this technical solution, the connection and rotation limitation of two adjacent monomers are achieved through necessary processing of both ends of the rotating shaft segment in the rotor assembly monomer, without the need for complex alignment to achieve rotor skew pole in the prior art, and the structure is simpler. The completely identical structure of each monomer is conducive to reducing production and manufacturing costs and production management. Different numbers of rotor assembly monomers are selected for assembling skew poles according to the actual length of the motor and the power requirement, which can improve the versatility and diversity of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of the middle rotor assembly monomer;

[0020] Figure 3 for Figure 1 A structural exploded view of a specific embodiment of a rotor assembly;

[0021] Figure 4 for Figure 3 A schematic diagram of the structure of the rotor assembly monomer;

[0022] Figure 5 for Figure 3 A schematic diagram of the rotor assembly after the skewed pole treatment;

[0023] Figure 6 for Figure 1 Another structural schematic diagram of the middle rotor assembly monomer;

[0024] Figure 7 for Figure 1 Another structural schematic diagram of the middle rotor assembly monomer.

[0025] The reference numerals are as follows:

[0026] 1. Rotor assembly unit; 11. Rotor core; 12. Rotating shaft section; 121. Connecting protrusion; 122. Connecting recess; 13. Permanent magnet; 2. Rotation limiting member; 3. Rotating shaft connector; 41. First supporting shaft section; 42. Second supporting shaft section. DETAILED DESCRIPTION

[0027] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, a rotor assembly is provided, comprising at least two rotor assembly monomers 1, wherein the rotor assembly monomers 1 comprise a rotor core 11 having a shaft hole and a shaft segment 12 inserted into the shaft hole and connected to the rotor core 11 as a whole, wherein the rotor core 11 is configured with a plurality of magnetic steel slots, wherein permanent magnets 13 are embedded in the magnetic steel slots, wherein a first end of the shaft segment 12 comprises a connecting protrusion 121 protruding from a first axial end surface of the rotor core 11, and a second end of the shaft segment 12 comprises a connecting recess 122 recessed in a second axial end surface of the rotor core 11, wherein one of the two rotor assembly monomers 1 forms an axial connection with the other through its connecting protrusion 121 and forms a circumferential rotation restriction with the other through its connecting recess 122. In this technical solution, the multiple rotor assembly monomers 1 are completely identical in structural construction. The rotor assembly can achieve axial connection and circumferential rotation limitation through the connecting protrusions 121 and connecting recesses 122 respectively possessed by the multiple rotor assembly monomers 1, so that the rotor assembly can be assembled in a modular manner, which greatly improves the assembly efficiency. At the same time, the skewing requirement of the rotor assembly is achieved through the relative rotation between two adjacent rotor assembly monomers 1, which can reduce the noise of the motor. In this technical solution, the connection and rotation limitation of two adjacent monomers are achieved by performing necessary processing on both ends of the rotating shaft section in the rotor assembly monomer 1. There is no need to achieve rotor skewing through complex alignment in the prior art, and the structure is simpler. The structure of each monomer is completely identical, which is conducive to reducing the cost of production and manufacturing and production management. According to the actual length of the motor and the power requirement, different numbers of rotor assembly monomers 1 are selected for assembling skewing poles, which can improve the versatility and diversity of the rotor assembly.

[0028] As a specific embodiment, preferably, the connecting protrusion 121 is a cylindrical boss, and a plurality of convex teeth are provided on the outer peripheral wall of the cylindrical boss, and the plurality of convex teeth are evenly spaced along the circumference of the cylindrical boss, and the connecting recess 122 is a cylindrical concave hole, and a plurality of concave teeth are provided on the inner peripheral wall of the cylindrical concave hole, and the plurality of concave teeth are matched with the plurality of convex teeth. The tooth width (circumferential direction) of the convex teeth and the concave teeth can be reasonably designed according to the specific pole tilting requirements. With this technical solution, different pole tilting angles can be achieved by mutually plugging and matching convex teeth and concave teeth. It can be understood that the final determination of the pole tilting angle will be completely limited by the number of teeth offset between the two rotor assembly monomers 1. Preferably, the rotor assembly also has angle scale lines, and the angle scale lines are arranged on the outer peripheral walls of the rotor core 11 at both ends of the axial direction along the circumference of the rotor core 11. The angle scale lines can instruct the assembler to rotate and skew the two rotor assembly units 1 to be skewed according to the corresponding angle deflection marks and then connect them.

[0029] As another specific implementation, preferably, the connecting protrusion 121 is a non-cylindrical boss, and the connecting recess 122 is matched with the non-cylindrical boss. In this technical solution, the non-circular characteristics of the connecting protrusion 121 on the outer contour are used to achieve the connection of the skew angle limited to anti-rotation. The structure is simple and easy to implement. When projected on the radial plane of the rotor core 11, the projection of the non-cylindrical boss is one of I-shaped, H-shaped, cross-shaped, triangular, polygonal, and elliptical. However, this method has certain shortcomings. For example, after the rotor assembly unit 1 is produced, the skew angle cannot be flexibly adjusted.

[0030] As another specific embodiment, preferably, the connection protrusion 121 and the connection recess 122 are respectively connected with a rotation limiting member 2, and also include a shaft connector 3, the shaft connector 3 has a first connection groove and a second connection groove matching the rotation limiting member 2, the first connection groove and the second connection groove are respectively located at the axial ends of the shaft connector 3, and a preset deflection angle is formed between the first connection groove and the second connection groove in the circumferential direction of the rotor core 11, and the rotation limiting member 2 can be inserted into the first connection groove and the second connection groove. At this time, the shaft connector 3 with different preset deflection angles can be used to achieve the selection of the degree of skewing between the two rotor assembly monomers 1 to be assembled, thereby improving the flexible selection of the skewing angle of the rotor assembly, and further improving the versatility of the rotor assembly.

[0031] The rotation limiting member 2 and the connecting protrusion 121 are connected by interference fit; and / or, the rotation limiting member 2 and the connecting protrusion of the connecting recess 122 are connected by interference fit, so that the rotation limiting member 2 can be flexibly replaced after being damaged, thereby improving the service life of the rotor assembly.

[0032] The rotor assembly also includes a first support shaft segment 41 and a second support shaft segment 42. The first support shaft segment 41 forms a detachable connection with a connecting protrusion 121 of a rotor assembly monomer 1 adjacent to the rotor assembly, and the second support shaft segment 42 forms a detachable connection with a connecting recess 122 of a rotor assembly monomer 1 adjacent to the rotor assembly.

[0033] According to an embodiment of the present invention, there is further provided an electric motor, comprising the above-mentioned rotor assembly.

[0034] According to an embodiment of the present invention, there is also provided an industrial equipment, comprising the above-mentioned motor. The industrial equipment may be, for example, an industrial robot, a robotic arm, a numerical control center, etc.

[0035] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: The invention comprises at least two rotor assembly monomers (1), wherein the rotor assembly monomers (1) comprise a rotor core (11) having a shaft hole and a shaft segment (12) inserted into the shaft hole and connected to the rotor core (11) as a whole, wherein the first end of the shaft segment (12) comprises a connection protrusion (121) protruding from the first axial end surface of the rotor core (11), and the second end of the shaft segment (12) comprises a connection recess (122) recessed in the second axial end surface of the rotor core (11), and one of the two rotor assembly monomers (1) is axially connected to the other through the connection protrusion (121) and forms a circumferential rotation restriction with the other through the connection recess (122) thereof; The connecting protrusion (121) is a non-cylindrical boss, and the connecting recess (122) is arranged to match the non-cylindrical boss; the connecting protrusion (121) and the connecting recess (122) are respectively connected to a rotation limiting member (2), and also include a shaft connector (3), the shaft connector (3) has a first connecting groove and a second connecting groove matching the rotation limiting member (2), the first connecting groove and the second connecting groove are respectively located at the axial ends of the shaft connector (3), and a preset deflection angle is formed between the first connecting groove and the second connecting groove in the circumferential direction of the rotor core (11), and the rotation limiting member (2) can be inserted into the first connecting groove and the second connecting groove.

2. The rotor assembly according to claim 1, characterized in that: The connecting protrusion (121) is a cylindrical boss, and a plurality of protruding teeth are arranged on the outer peripheral wall of the cylindrical boss. The plurality of protruding teeth are evenly spaced along the circumference of the cylindrical boss. The connecting concave portion (122) is a cylindrical concave hole, and a plurality of concave teeth are arranged on the inner peripheral wall of the cylindrical concave hole. The plurality of concave teeth are matched with the plurality of protruding teeth.

3. The rotor assembly according to claim 2, characterized in that: It also has angle scale lines, which are arranged on the outer peripheral walls at both axial ends of the rotor core (11) along the circumferential direction of the rotor core (11).

4. The rotor assembly according to claim 1, characterized in that: When projected on a radial plane of the rotor core (11), the projection of the non-cylindrical boss is in one of an I-shape, an H-shape, a cross shape, a polygon, and an ellipse.

5. The rotor assembly according to claim 1, characterized in that: The rotation limiting member (2) is connected to the connecting protrusion (121) by an interference fit; and / or the rotation limiting member (2) is connected to the connecting protrusion of the connecting recess (122) by an interference fit.

6. The rotor assembly according to any one of claims 1 to 5, characterized in that: It also includes a first support shaft segment (41) and a second support shaft segment (42), wherein the first support shaft segment (41) forms a detachable connection with a connecting protrusion (121) of a rotor assembly monomer (1) adjacent to the rotor assembly, and the second support shaft segment (42) forms a detachable connection with a connecting recess (122) of a rotor assembly monomer (1) adjacent to the rotor assembly.

7. A motor, comprising a rotor assembly, characterized in that: The rotor assembly is the rotor assembly according to any one of claims 1 to 6.

8. An industrial equipment, comprising a motor, characterized in that: The motor is the motor according to claim 7.

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