Magnetic steel falling prevention structure of permanent magnet direct drive synchronous motor

Abstract

The utility model discloses a structure for preventing magnetic steel from falling off of a permanent magnet direct drive synchronous motor, which belongs to the technical field of permanent magnet direct drive motors and comprises a rotor iron core formed by a plurality of rotor punching sheets sleeved outside a rotating shaft and arranged along the axial direction, a plurality of magnetic steels surface-mounted on the periphery of the rotor iron core, and a stainless steel sleeve sleeved on the periphery of the magnetic steels. An aluminum conducting bar for fixing the magnetic steel is clamped between every two rows of magnetic steel; epoxy resin glue is filled between the stainless steel sleeve and the magnetic steel; and a plurality of screws for fixing the aluminum conducting bar are arranged on the aluminum conducting bar. According to the utility model, the deformation of the magnetic steel aluminum conducting bar and the falling of the magnetic steel under the action of centrifugal force in the operation process of the motor can be prevented, the stable operation of the motor can be realized, and the stability of the operation of the motor is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet direct drive motor technology, and in particular to a structure for preventing the detachment of antimagnetic steel in a permanent magnet direct drive synchronous motor. Background Technology

[0002] The motor rotor is the heart of the motor, the core component that transmits torque. It mainly consists of a rotor core, magnets, and shaft. During motor operation, the magnets are prone to loosening and falling off under centrifugal force, causing the motor to rub against the rotor and reducing its performance, lifespan, and safety. Therefore, a protective sleeve is needed to protect the magnets.

[0003] Currently, commonly used rotor sleeve structures include: stainless steel sleeves, which are heavy, increasing the rotor's own weight, resulting in power loss, and affecting the life of motor bearings during high-speed operation;

[0004] Injection molded sleeves and composite material sleeves have low temperature resistance and are not suitable for high-power, high-speed motors.

[0005] Prefabricated press-fit carbon fiber sheaths are difficult to control in terms of size, pressing, and interference fit.

[0006] Therefore, it is necessary to design a structure to prevent the magnetic steel from falling off in a permanent magnet direct-drive synchronous motor in order to overcome the above problems. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a structure for preventing the magnets from falling off in a permanent magnet direct drive synchronous motor, which can ensure that the magnets of the permanent magnet direct drive synchronous motor do not fall off and can operate continuously, safely and stably.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A structure for preventing magnet detachment in a permanent magnet direct-drive synchronous motor includes a rotor core consisting of several rotor laminations arranged axially and mounted on the outside of a rotating shaft; several magnets attached to the outer periphery of the rotor core; and a stainless steel sleeve mounted on the outer periphery of the magnets. An aluminum guide bar for fixing the magnets is clamped between every two rows of magnets. Epoxy resin is filled between the stainless steel sleeve and the magnets. Several screws for fixing the aluminum guide bar are provided on the aluminum guide bar.

[0010] A further improvement of this utility model is that the cross-section of the aluminum guide strip is trapezoidal.

[0011] A further improvement of the present invention is that the rotor lamination is an annular structure with a shaft hole in the middle.

[0012] A further improvement of this utility model is that after the epoxy resin adhesive cools and cures, a protective layer is formed on the outside of the magnet and the aluminum conductor.

[0013] A further improvement to this utility model is that the stainless steel sleeve is removed after the epoxy resin glue has cooled and cured.

[0014] A further improvement of the present invention is that the rotor core also includes a rotor core tie rod, a retaining ring, a rotor aluminum baffle, a rotor aluminum filler core, and quick-drying adhesive for installing and fixing rotor laminations.

[0015] A further improvement of this utility model is that: a threaded fastening adhesive, a flat washer, a spring flat washer, and a hexagonal nut are sequentially provided at the outer end of the rotor core tie rod.

[0016] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0017] 1. This utility model involves attaching magnets to the outer surface of a rotor core composed of several rotor laminations. Aluminum guide strips are used to clamp and fix the magnets together with screws. A stainless steel sleeve is inlaid on the outside of the magnets, and epoxy resin is injected between the magnets and the stainless steel sleeve to form a thin protective layer on the outside of the magnets. Simultaneously, the gap between the magnets and the rotor core is filled with epoxy resin. The epoxy resin firmly fixes the rotor core, magnets, and stainless steel sleeve into a single unit. This prevents deformation of the aluminum guide strips and magnet detachment during motor operation under centrifugal force, enabling stable operation of the permanent magnet direct-drive synchronous motor and greatly improving the stability of motor operation.

[0018] 2. This utility model involves injecting epoxy resin into a stainless steel sleeve. After the epoxy resin cools and cures, the stainless steel sleeve is removed, forming a thin protective layer on the outside of the magnet. This protective sleeve reduces the rotor's weight and power loss. It also prevents the aluminum conductor of the magnet from deforming or falling off during motor operation under centrifugal force, enabling stable operation of the permanent magnet direct-drive synchronous motor and greatly improving the stability of motor operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an overall schematic diagram of the antimagnetic steel detachment structure of a permanent magnet direct drive synchronous motor provided in this embodiment of the utility model;

[0021] Figure 2 This is a cross-sectional view of a permanent magnet direct drive synchronous motor antimagnetic steel detachment structure according to an embodiment of this utility model;

[0022] Figure 3 This is an enlarged cross-sectional view of a permanent magnet direct-drive synchronous motor antimagnetic steel detachment structure according to an embodiment of this utility model;

[0023] Figure 4 This is a side view of a permanent magnet direct drive synchronous motor antimagnetic steel detachment structure according to an embodiment of this utility model;

[0024] The components include: 1. Rotary shaft; 2. Rotor core tie rod; 3. Retaining ring; 4. Rotor lamination; 5. Magnet; 6. Epoxy resin adhesive; 7. Quick-drying adhesive; 8. Rotor aluminum baffle; 9. Rotor aluminum supplementary core; 10. Stainless steel sleeve; 11. Aluminum guide bar; 12. Balance block. Detailed Implementation

[0025] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0029] like Figure 1-3 As shown, a structure for preventing magnet steel detachment in a permanent magnet direct-drive synchronous motor includes a rotor core composed of several rotor laminations 4 arranged axially and mounted on the outside of a rotating shaft 1; several magnets 5 attached to the outer periphery of the rotor core; and a stainless steel sleeve 10 mounted on the outer periphery of the magnets 5. An aluminum guide strip 11 for fixing the magnets 5 is clamped between every two rows of magnets 5. Epoxy resin 6 is filled between the stainless steel sleeve 10 and the magnets 5. Several screws for fixing the aluminum guide strip 11 are provided on the aluminum guide strip 11.

[0030] The stainless steel sleeve 10 has a thickness of 0.5 mm, which is much smaller than the thickness of the stainless steel sleeve mentioned in the background art. The circumference of the stainless steel sleeve 10 is 3 mm larger than the circumference of the circle formed by the magnets 5 attached to the rotor core.

[0031] Furthermore, the cross-section of the aluminum guide strip 11 is trapezoidal.

[0032] Furthermore, the rotor lamination 4 is an annular structure with a shaft hole in the middle.

[0033] Furthermore, after the epoxy resin adhesive 6 cools and cures, a protective layer is formed on the outside of the magnet 5 and the aluminum guide strip 11.

[0034] Furthermore, after the filled epoxy resin 6 has cooled and cured, the stainless steel sleeve 10 is removed.

[0035] Furthermore, the rotor core also includes a rotor core tie rod 2, a retaining ring 3, a rotor aluminum baffle 8, a rotor aluminum filler core 9, and quick-drying adhesive 7 for mounting and fixing the rotor laminations 4.

[0036] Furthermore, threaded fastening adhesive, flat washers, spring flat washers, and hexagonal nuts are sequentially installed at the outer end of the rotor core tie rod 2.

[0037] Example 1

[0038] like Figure 1-3As shown, a structure for preventing magnet steel detachment in a permanent magnet direct-drive synchronous motor is described. The rotor laminations 4 must be tightly stacked to ensure sufficient thickness. After stacking, the rotor laminations 4 form the rotor core. The rotor core is then secured using rotor aluminum baffles 8, retaining rings 3, rotor aluminum filler cores 9, quick-drying adhesive 7, and rotor core tie rods 2 (with flat washers, spring flat washers, and hexagonal nuts). The outer diameter of the rotor core is then machined, ensuring the core is free of warping, deformation, and damage. Magnets 5 are then surface-attached to the outer side of the machined rotor core (the inner side of the magnets 5 is attached to the outer side of the rotor core). When surface-attaching the magnets 5, one row can be fixed first with adhesive (or not, as long as the magnets 5 do not move). Then, aluminum guide strips 1 are pressed on, and the next row of magnets 5 is placed. After both rows are fixed, the pressure of the aluminum guide strips 1 is adjusted. Tighten the magnet 5, and so on, to complete the process of fixing the magnet 5 between each aluminum guide bar 11. The aluminum guide bars 11 are then fixed with screws, generally 6-7 screws on each aluminum guide bar 11. Then, the stainless steel sleeve 10 is fitted onto the outside of the magnet 5, and then the gap between the stainless steel sleeve 10 and the magnet 5 is filled with epoxy resin 6. At the same time, the epoxy resin 6 also fills the gap between the magnet 5 and the rotor core. After the epoxy resin 6 cools and solidifies, it firmly wraps the magnet 5 and firmly bonds and fixes the stainless steel sleeve 10 to the rotor core as one unit. This effectively prevents the magnet from loosening or falling off during operation, causing motor swirl, and greatly improves the performance, life and safety of the motor.

[0039] Example 2

[0040] The difference between this embodiment and embodiment 1 is that after the epoxy resin 6 has cooled and solidified, the stainless steel sleeve 10 is removed. The epoxy resin 6 firmly wraps the magnet 5, which effectively prevents the magnet 5 from loosening or falling off during operation, causing the motor to rub against the rotor. At the same time, removing the stainless steel sleeve 10 reduces the weight of the rotor, reduces power loss, and greatly improves the performance, lifespan, and safety of the motor.

[0041] like Figure 4 As shown, the rotor dynamic balancing in this utility model is weighted balancing. After the rotor is dynamically balanced, the unbalance amount must be less than 8g. The balance block 12 is welded to the end shaft surface, and the height must not exceed 20mm.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A structure for preventing the detachment of antimagnetic steel in a permanent magnet direct-drive synchronous motor, characterized in that: It includes a rotor core consisting of several rotor laminations (4) arranged axially around a rotating shaft (1), several magnets (5) attached to the outer periphery of the rotor core, and a stainless steel sleeve (10) fitted around the outer periphery of the magnets (5); an aluminum guide strip (11) for fixing the magnets (5) is clamped between every two rows of magnets (5); epoxy resin glue (6) is filled between the stainless steel sleeve (10) and the magnets (5); and several screws for fixing the aluminum guide strip (11) are provided on the aluminum guide strip (11).

2. The anti-magnetic steel detachment structure for a permanent magnet direct-drive synchronous motor according to claim 1, characterized in that: The cross-section of the aluminum guide strip (11) is trapezoidal.

3. The anti-magnetic steel detachment structure for a permanent magnet direct-drive synchronous motor according to claim 1, characterized in that: The rotor lamination (4) is an annular structure with a shaft hole in the middle.

4. The anti-magnetic steel detachment structure for a permanent magnet direct-drive synchronous motor according to claim 1, characterized in that: After the epoxy resin adhesive (6) cools and cures, a protective layer is formed on the outside of the magnet (5) and the aluminum guide strip (11).

5. The anti-magnetic steel detachment structure for a permanent magnet direct-drive synchronous motor according to claim 1, characterized in that: After the epoxy resin glue (6) has cooled and cured, the stainless steel sleeve (10) is removed.

6. The anti-magnetic steel detachment structure for a permanent magnet direct-drive synchronous motor according to claim 1, characterized in that: The rotor core also includes a rotor core tie rod (2), a retaining ring (3), a rotor aluminum baffle (8), a rotor aluminum filler core (9), and quick-drying adhesive (7) for installing and fixing the rotor laminations (4).

7. The anti-magnetic steel detachment structure for a permanent magnet direct-drive synchronous motor according to claim 6, characterized in that: At the outer end of the rotor core tie rod (2), a threaded fastening adhesive, a flat washer, a spring flat washer, and a hexagonal nut are sequentially provided.

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