Servo motor rotor magnetic isolation bridge structure

Abstract

The utility model discloses a servo motor rotor magnetic isolation bridge structure design, which relates to the technical field of servo motors, and comprises a rotor body, ten corresponding magnetic steel grooves are arranged at the edge of the rotor body, rotor permanent magnets are arranged in the magnetic steel grooves, the directions of adjacent rotor permanent magnets are opposite, and the magnetic isolation bridge is arranged in the magnetic steel grooves. A first magnetic isolation bridge is arranged between every two adjacent magnetic steel grooves, air magnetic isolation bridges are arranged on the outer surfaces of the magnetic isolation bridges, second magnetic isolation bridges are arranged on the surface of the rotor body, the second magnetic isolation bridges correspond to the rotor permanent magnets, further, the air magnetic isolation bridges are arranged to be U-shaped openings, and the air magnetic isolation bridges are arranged to be U-shaped openings. The magnetic isolation bridge is semicircular, so that the magnetic energy loss can be reduced, the torque ripple can be reduced, the cogging torque of the motor can be reduced, and the precision of the motor can be improved.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, specifically to a servo motor rotor magnetic bridge structure. Background Technology

[0002] Servo motors offer significant advantages in precision, reliability, noise reduction, overload capacity, and energy conversion efficiency, and are widely used in industries such as 3C automation, medical devices, robotics, automotive manufacturing, and CNC machine tools. Torque ripple, cogging torque, and electromagnetic energy conversion are key indicators for evaluating motor performance.

[0003] The torque ripple, cogging torque, and electromagnetic energy conversion of existing low-power servo motors on the market are not ideal. Meanwhile, the magnetic bridge on the rotor is a key structure affecting these three parameters. However, most brands of motors on the market do not have a magnetic bridge on the rotor or the magnetic bridge is too large, resulting in an unsatisfactory magnetic isolation effect. This leads to more magnetic leakage, large torque ripple, and large cogging torque in permanent magnet motors. Therefore, we propose a magnetic bridge structure for servo motor rotors. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a servo motor rotor magnetic bridge structure that can reduce magnetic energy loss, reduce torque fluctuation, reduce motor cogging torque, thereby improving motor accuracy and effectively solving the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a servo motor rotor magnetic bridge structure, comprising a rotor body, ten corresponding magnetic slots are provided on the side of the rotor body, rotor permanent magnets are installed inside the magnetic slots, adjacent rotor permanent magnets are in opposite directions, a first magnetic bridge is provided between two adjacent magnetic slots, an air magnetic bridge is provided on the outer surface of the first magnetic bridge, and a second magnetic bridge is provided on the surface of the rotor body, the second magnetic bridge corresponding to the rotor permanent magnets.

[0006] Furthermore, the air-insulated magnetic bridge is configured with a U-shaped opening.

[0007] Furthermore, the magnetic isolation bridge is semi-circular in shape.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: This servo motor rotor magnetic bridge structure has the following advantages:

[0009] By adopting this design scheme, the leakage flux density at the magnetic isolation bridge can be reduced; the utilization rate of permanent magnets can be increased; the motor torque fluctuation can be reduced; and the cogging torque can be lowered. Attached Figure Description

[0010] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a magnetic flux density distribution diagram of the motor under no-load conditions when this utility model has not been implemented;

[0012] Figure 3 The magnetic flux density distribution diagram of the motor under no-load when implementing this utility model;

[0013] In the diagram: 1. Rotor body, 2. Rotor permanent magnet, 3. First magnetic isolation bridge, 4. Air magnetic isolation bridge, 5. Second magnetic isolation bridge. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3 This embodiment provides a technical solution: a servo motor rotor magnetic bridge structure, including a rotor body 1, ten corresponding magnetic steel slots are provided on the side of the rotor body 1, rotor permanent magnets 2 are installed inside the magnetic steel slots, adjacent rotor permanent magnets 2 are in opposite directions, a first magnetic bridge 3 is provided between two adjacent magnetic steel slots, an air magnetic bridge 4 is provided on the outer surface of the first magnetic bridge 3, a second magnetic bridge 5 is provided on the surface of the rotor body 1, the second magnetic bridge 5 corresponds to the rotor permanent magnets 2, the air magnetic bridge 4 is configured with a U-shaped opening, and the magnetic bridge 5 is semi-circular in shape.

[0016] The working principle of the servo motor rotor magnetic bridge structure provided by this utility model is as follows: During processing, electromagnetic simulation software is used to calculate the width dimensions of the first magnetic bridge 3, the air magnetic bridge 4, and the second magnetic bridge 5 on the rotor body 1, simulating the state with minimal magnetic leakage. Simultaneously, the mechanical strength of the rotor body 1 needs to be considered during the calculation. Then, according to the simulated magnetic bridge dimensions, a silicon steel sheet mold is made. After mold making, the rotor laminations and rotor permanent magnet 2 are assembled using normal process methods. The magnetic fields under each pole are sequentially opposite. The rotor body 1, composed of the rotor laminations, is a non-segmented straight-pole structure. After assembly, as shown... Figure 1 As shown;

[0017] Figure 2 The diagram shows the magnetic flux density distribution of the motor under no-load conditions when this scheme is not implemented. It can be seen that the magnetic field output of the magnetic isolation bridge reaches saturation, and the average magnetic flux density of the magnetic isolation bridge reaches 2.24T.

[0018] Figure 3After implementing this scheme, the unloaded average magnetic flux density at the magnetic isolation bridge is reduced to 1.9T, and the rotor leakage flux is reduced.

[0019] After implementing this solution, the no-load torque fluctuation of the motor is about 1.9% and the percentage of cogging torque pulsation (relative to rated torque) is 2.3%. The data shows that the torque fluctuation and cogging torque have decreased significantly. This indicates that this solution can reduce the leakage flux density at the magnetic bridge, increase the utilization rate of the permanent magnet, reduce the motor torque fluctuation, and reduce the cogging torque.

[0020] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A servo motor rotor magnetic bridge structure, characterized in that: It includes rotor body (1), the edge of rotor body (1) is provided with ten corresponding magnetic steel slots, the inside of magnetic steel slot is installed with rotor permanent magnet (2), the direction of adjacent rotor permanent magnet (2) is opposite, and first magnetic bridge (3) is arranged between two adjacent magnetic steel slots.

2. The servo motor rotor barrier structure of claim 1, wherein: The outer surface of first magnetic bridge (3) is provided with air magnetic bridge (4), and the surface of rotor body (1) is provided with second magnetic bridge (5).

3. The servo motor rotor bridge structure of claim 2, wherein: Second magnetic bridge (5) corresponds to rotor permanent magnet (2).

4. The servo motor rotor bridge structure of claim 2, wherein: Air magnetic bridge (4) is provided in U-shaped opening.

5. The servo motor rotor bridge structure of claim 2, wherein: The shape of second magnetic bridge (5) is semicircular.

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