Permanent magnet motor rotor magnetic steel

Abstract

The utility model discloses rotor magnetic steel of a permanent magnet motor, which comprises an arc-shaped magnetic steel tile and a plurality of positive S-shaped glue retaining grooves and reverse S-shaped glue retaining grooves which are continuously arranged on the inner wall of one side of the arc-shaped magnetic steel tile in an array manner, and the positive S-shaped glue retaining grooves and the reverse S-shaped glue retaining grooves are intersected to form a plurality of intersection parts. The back surface of the arc-shaped magnetic steel tile is provided with a plurality of vertically parallel straight line glue reserving grooves. According to the utility model, vibration and displacement of the magnetic steel sheets during high-speed rotation can be reduced by adding the glue retaining grooves, i.e., the increase of the bonding area is helpful for reducing the adverse effect of mechanical impact or vibration on bonding, and meanwhile, the glue can be more uniformly filled and fixed in the glue retaining grooves, so that the magnetic steel sheets are prevented from being damaged during the operation process of the motor. And the influence of temperature change on the bonding strength is small, so that the durability and reliability of bonding are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic steels, in particular to a permanent magnet motor rotor magnetic steel. Background Technique

[0002] A permanent magnet motor generally consists of two parts: a stator and a rotor. In a permanent magnet motor, permanent magnets are usually installed on the rotor, and the rotor magnetic steel is the external structure surrounding the permanent magnet. Specifically, the rotor magnetic steel is tightly fixed on the rotor, covering and protecting the permanent magnet. This installation method ensures that the permanent magnet can stably generate a magnetic field and will not move or loosen during the operation of the motor, thus ensuring the stability and performance of the motor. During the installation of the magnetic steel, it is necessary to ensure that the surfaces of the rotor and the magnetic steel sheet are clean and free of oil stains so that the adhesive can effectively adhere. Selecting an adhesive or epoxy resin suitable for high-temperature and high-speed operating environments is a crucial step. These materials usually have good heat resistance and chemical stability to ensure that they will not loosen due to vibration or temperature changes during the operation of the motor. The precise assembly process includes precisely aligning the pre-treated magnetic steel sheet and the permanent magnet to ensure that the magnetic field can be effectively conducted to the stator part of the motor after assembly. The curing or hardening process is an important step to ensure that the adhesive is completely cured to form a strong connection. Finally, if necessary, an insulating layer can be added between the magnetic steel sheet and the permanent magnet to prevent the influence of current or electromagnetic fields on the permanent magnet; for example, a rotor magnetic steel structure of a permanent magnet motor disclosed in the authorized publication number CN210380431U includes silicon steel laminations and permanent magnet steels embedded in the silicon steel laminations. The magnetic steels are circumferentially and evenly distributed in the silicon steel laminations. Each magnetic steel has an integral "L"-shaped bending structure, and the lengths of the two bent sides are equal. The bending point is opposite to the center of the silicon steel laminations. By designing the magnetic steel size to present an "L"-shaped bending structure, 15 slots are evenly arranged in the rotor silicon steel laminations, and the permanent magnet steels are pasted in the rotor. However, the front and rear outer walls of the magnetic steel sheet in this technical solution are still relatively smooth. At this time, the adhesive needs to be coated on the smooth wall surface, which results in less adhesive adhesion on the outer wall of the magnetic steel sheet. Insufficient adhesive adhesion means a reduction in the bonding area, thereby weakening the bonding strength between the magnetic steel sheet and the rotor. During the operation of the motor, especially under high-speed rotation and high-load conditions, weak bonding may cause the separation or loosening between the magnetic steel sheet and the rotor, thereby affecting the normal operation of the motor. Content of the Utility Model

[0003] The purpose of the utility model is to provide a permanent magnet motor rotor magnetic steel, on the inner wall of the arc-shaped magnetic steel tile, a plurality of positive and negative S-shaped glue-retaining grooves are arranged in an interlaced manner, and a straight glue-retaining groove is arranged on the outer wall of the arc-shaped magnetic steel tile, so as to increase the glue-retaining amount on the inner and outer walls of the arc-shaped magnetic steel tile, and obtain more adhesive force between it and the rotor, so as to solve the problems put forward in the above background technique.

[0004] To achieve the above object, the utility model provides the following technical solutions: A permanent magnet motor rotor magnet, comprising an arc-shaped magnet tile and a plurality of positive S-shaped glue-retaining grooves and reverse S-shaped glue-retaining grooves continuously arranged in an array on the inner wall of one side of the arc-shaped magnet tile. The positive S-shaped glue-retaining grooves and the reverse S-shaped glue-retaining grooves intersect to form a plurality of intersection parts, and a plurality of vertically parallel linear glue-retaining grooves are arranged on the back of the arc-shaped magnet tile.

[0005] Preferably, the initial part and the end part of the positive S-shaped glue-retaining grooves and the reverse S-shaped glue-retaining grooves on the inner wall of the arc-shaped magnet tile share a common point.

[0006] Preferably, the cutting depth of the positive S-shaped glue-retaining grooves and the reverse S-shaped glue-retaining grooves is 0.05 to 0.2 mm.

[0007] Preferably, the cutting depth of the linear glue-retaining grooves is 0.1 mm to 0.2 mm.

[0008] Preferably, flat parts are provided at the top and bottom of the arc-shaped magnet tile, and a multi-point overflow glue structure is provided on both sides of the arc-shaped magnet tile.

[0009] Preferably, the multi-point overflow glue structure on the side includes straight-mouth-shaped glue storage grooves provided on both sides inside the arc-shaped magnet tile and not completely penetrating, and a plurality of equally spaced through holes are provided on the outer walls of both sides of the arc-shaped magnet tile. The through holes are in communication with the straight-mouth-shaped glue storage grooves.

[0010] Preferably, a total of twelve through holes are provided, and the diameter of the straight-mouth-shaped glue storage grooves is 0.5 cm to 1 cm. Compared with the prior art, the beneficial effects of the utility model are as follows: The permanent magnet motor rotor magnet is provided with mutually cooperating structures such as linear glue-retaining grooves and positive S-shaped glue-retaining grooves. By increasing the glue-retaining grooves, the vibration and displacement of the magnet sheets during high-speed rotation can be reduced. That is, the increase in the contact area helps to reduce the adverse effects of mechanical shock or vibration on bonding. At the same time, since the adhesive can be more evenly filled and fixed in the glue-retaining grooves, during the operation of the motor, the influence of temperature change on the bonding strength is smaller, ensuring the durability and reliability of the bonding. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is the front view structural schematic diagram of the utility model;

[0012] Figure 2 is the side view structural schematic diagram of the utility model;

[0013] Figure 3 is the three-dimensional structural schematic diagram of the utility model;

[0014] Figure 4 is the three-dimensional structural schematic diagram of the utility model;

[0015] Figure 5 This is a three-dimensional structural schematic diagram of the assembled state of the arc-shaped magnetic steel tile of the present utility model and the rotor;

[0016] In the figure: 1. Arc-shaped magnetic steel tile; 2. Positive S-shaped glue-retaining groove; 3. Reverse S-shaped glue-retaining groove; 4. Junction part; 5. Straight glue-retaining groove; 6. Plane part; 7. Multi-point glue overflow structure on the side line; 701. Straight-mouth glue storage groove; 702. Through hole. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figures 1-5 , an embodiment provided by the present utility model: a permanent magnet motor rotor magnetic steel, including an arc-shaped magnetic steel tile 1 and a plurality of positive S-shaped glue-retaining grooves 2 and reverse S-shaped glue-retaining grooves 3 continuously arranged in an array on one inner wall side of the arc-shaped magnetic steel tile 1. The positive S-shaped glue-retaining grooves 2 and the reverse S-shaped glue-retaining grooves 3 intersect to form several junction parts 4, and a plurality of vertically parallel straight glue-retaining grooves 5 are arranged on the back of the arc-shaped magnetic steel tile 1;

[0019] The cutting depth of the positive S-shaped glue-retaining groove 2 and the reverse S-shaped glue-retaining groove 3 is 0.05 to 0.2 mm, and the cutting depth of the straight glue-retaining groove 5 is 0.1 mm to 0.2 mm;

[0020] Controlling the cutting depth of the glue-retaining groove can ensure that the thickness of the bonding layer is within the ideal range. If the bonding layer is too thick, it may increase the magnetic resistance of the motor and affect the efficiency; if it is too thin, it may lead to insufficient bonding strength. Therefore, by precisely controlling the cutting depth, it can be ensured that the bonding layer is in the optimal state, which can not only provide sufficient bonding strength but also not increase unnecessary magnetic resistance;

[0021] The initial part and the end part of the positive S-shaped glue-retaining groove 2 and the reverse S-shaped glue-retaining groove 3 on the inner wall of the arc-shaped magnetic steel tile 1 share the same point. The initial part and the end part of the positive S-shaped glue-retaining groove 2 and the reverse S-shaped glue-retaining groove 3 are at the same point. When the initial part and the end part are at the same point, it is ensured that the filling of the adhesive always starts from the same starting position and ends at the same ending position, thereby effectively controlling the coating amount and uniformity of the adhesive, avoiding uneven bonding strength or weak points caused by inconsistent coating positions; and the adhesive can fill the glue-retaining groove more effectively without wasting excessive coating at the starting and ending positions;

[0022] Both the top end and the bottom end of the arc-shaped magnetic steel tile 1 are provided with flat portions 6. Both sides of the arc-shaped magnetic steel tile 1 are provided with a multi-point edge glue overflow structure 7. The multi-point edge glue overflow structure 7 includes straight-mouth glue storage grooves 701 provided on both inner sides of the arc-shaped magnetic steel tile 1 and not completely penetrating. A number of equally spaced through holes 702 are provided on the outer walls of both sides of the arc-shaped magnetic steel tile 1. The through holes 702 communicate with the straight-mouth glue storage grooves 701. A total of twelve through holes 702 are provided. The diameter of the straight-mouth glue storage groove 701 is 0.5 cm to 1 cm. For both sides of the arc-shaped magnetic steel tile 1, the staff first installs the arc-shaped magnetic steel tile 1 into the rotor tile groove, and then injects glue into the straight-mouth glue storage groove 701. Then the glue will enter the contact part between the arc-shaped magnetic steel tile 1 and the rotor through the through holes 702. And as the glue is continuously injected, each through hole 702 will become a bonding point.

[0023] Injecting glue into the contact part through the through holes 702 can ensure uniform filling of the glue in the bonding space. Doing so can avoid problems such as unstable bonding quality or uneven strength caused by uneven manual coating or spreading, improve the overall bonding strength and stability, and each through hole 702 becomes a bonding point, so that the amount of glue at each bonding point can be precisely controlled.

[0024] When the embodiment of the present application is in use, first, the staff coats adhesive on both the inner wall and the outer wall of the arc-shaped magnetic steel tile 1 to be used. For the inner wall of the arc-shaped magnetic steel tile 1, a number of positive S-shaped glue retention grooves 2 and reverse S-shaped glue retention grooves 3 are arranged in an array and intersect to form a junction part 4, so that more glue can be retained on the inner wall of the arc-shaped magnetic steel tile 1. For the outer wall of the arc-shaped magnetic steel tile 1, the glue retention amount is increased through the straight glue retention groove 5. When the arc-shaped magnetic steel tile 1 is inserted into the rotor tile groove, the adhesive can be more evenly filled on the contact surfaces of the arc-shaped magnetic steel tile 1 and the rotor, thereby improving the bonding firmness. By increasing the glue retention grooves, the vibration and displacement of the magnetic steel sheet during high-speed rotation can be reduced, that is, the increase in the contact area helps to reduce the adverse effects of mechanical shock or vibration on the bonding. At the same time, since the adhesive can be more evenly filled and fixed in the glue retention grooves, during the operation of the motor, the influence of temperature change on the bonding strength is small, ensuring the durability and reliability of the bonding.

[0025] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. Permanent magnet motor rotor magnet, characterized in that: It includes an arc-shaped magnetic steel tile (1), and a plurality of positive S-shaped glue-retaining grooves (2) and reverse S-shaped glue-retaining grooves (3) continuously arrayed on the inner wall on one side of the arc-shaped magnetic steel tile (1). The positive S-shaped glue-retaining grooves (2) and the reverse S-shaped glue-retaining grooves (3) intersect to form several intersection parts (4), and several vertically parallel linear glue-retaining grooves (5) are arranged on the back surface of the arc-shaped magnetic steel tile (1).

2. The permanent magnet of the permanent magnet motor rotor according to claim 1, wherein: The initial part and the end part of the positive S-shaped glue-retaining groove (2) and the reverse S-shaped glue-retaining groove (3) on the inner wall of the arc-shaped magnetic steel tile (1) share a same point position.

3. The permanent magnet of the permanent magnet motor rotor according to claim 1, characterized in that: The cutting depth of the positive S-shaped glue-retaining groove (2) and the reverse S-shaped glue-retaining groove (3) is 0.05 to 0.2 mm.

4. The permanent magnet of the permanent magnet motor rotor according to claim 1, characterized in that: The cutting depth of the linear glue-retaining groove (5) is 0.1 mm to 0.2 mm.

5. The permanent magnet of the permanent magnet motor rotor according to claim 1, wherein: Plane parts (6) are arranged at the top end and the bottom end of the arc-shaped magnetic steel tile (1), and multi-point edge overflow glue structures (7) are arranged on both side edges of the arc-shaped magnetic steel tile (1).

6. The permanent magnet of the permanent magnet motor rotor according to claim 5, characterized in that: The multi-point edge overflow glue structure (7) includes straight-mouth type glue storage grooves (701) arranged on both inner sides of the arc-shaped magnetic steel tile (1) and not completely penetrating. A plurality of equally spaced through holes (702) are arranged on the outer walls on both sides of the arc-shaped magnetic steel tile (1), and the through holes (702) are communicated with the straight-mouth type glue storage grooves (701).

7. The permanent magnet of the permanent magnet motor rotor according to claim 6, characterized in that: A total of twelve through holes (702) are provided, and the diameter of the straight-mouth type glue storage groove (701) is 0.5 cm to 1 cm.

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