CN201113595Y - Fixing structure for magnet and silicon steel sheet of motor rotor - Google Patents

Abstract

The utility model discloses a magnet and silicon steel sheet fixing structure of a motor rotor, wherein a plastic shell for covering and combining the magnet and the silicon steel sheet is constructed by injection molding, and convex points for positioning the magnet are arranged at positions between the silicon steel sheets corresponding to the magnets, and the plastic shell can be used to fix the magnet and the silicon steel sheet to prevent the magnet from being thrown out; wherein, the convex points are used to strengthen the positioning effect between the magnet and the silicon steel sheet, and relative displacement between the magnet and the silicon steel sheet can be avoided due to the inertia effect of the motor rotor starting rotation or braking.

Description

The magnet and silicon steel sheet fixed structure of the motor rotor

technical field

The utility model relates to a motor structure, in particular to a structure of a motor rotor.

Background technique

As shown in Figure 1, it is a cross-sectional view of a general existing motor rotor. This existing motor rotor is mainly composed of several silicon steel sheets 20 stacked on the motor shaft 10, and several half-moon shaped steel sheets 20 are fixed on the periphery of the silicon steel sheet 20. The magnet 30 is formed; the existing motor rotor mainly adopts the bonding method to glue and combine all the magnets 30 and the silicon steel sheet 20, in order to utilize the bonding effect of the glue 40, so that each magnet 30 can be bonded to the peripheral side of the silicon steel sheet 20 .

When in use, at the moment when the motor rotor starts running or brakes and stops, the magnet and the silicon steel sheet are very likely to generate relative displacement energy due to inertia, and when the motor runs at high speed or for a long time, the motor shaft It will generate heat due to high-speed friction. After a period of operation, the glue used to fix the magnet is very likely to undergo qualitative changes due to repeated heating, and thus cannot maintain the proper bonding ability.

Therefore, if the motor rotor continues to operate when the glue used to fix the magnet has undergone a qualitative change, not only will there be a risk of the magnet being separated from the silicon steel sheet, especially when the motor rotor rotates at a high speed and generates centrifugal force, it will accelerate. The magnet is separated from the silicon steel sheet, and the magnet is thrown out at high speed, causing damage to the motor structure.

Contents of the invention

In view of this, the utility model is to provide a combination and fixation of the magnet and the silicon steel sheet to prevent the magnet from falling off and being thrown out, and to effectively prevent the magnet and the silicon steel sheet from being opposed to each other due to the inertia of the motor rotor starting rotation or braking. Fixed construction of displacement.

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A magnet and silicon steel sheet fixing structure for a motor rotor, the motor rotor is a motor rotor with several silicon steel sheets stacked on the motor shaft, and several magnets are arranged on the periphery of the silicon steel sheet; it is characterized in that: each silicon steel sheet corresponds to each magnet The positions between the magnets are provided with bumps for positioning, and a plastic shell for covering and combining the magnets with the silicon steel sheets.

Specifically, the fixed structure of the present utility model has the following advantages:

1. All the magnets are coated and combined on the periphery of the silicon steel sheet by the plastic shell, which can prevent the magnets from being thrown out.

2. The bumps between the magnets form a stable positioning effect on the magnets, avoiding the relative displacement between the magnets and the silicon steel sheet, reducing the factors that damage the fixed structure, and greatly improving the reliability and service life of the motor rotor.

Description of drawings

Fig. 1 is a sectional view of the existing motor rotor section structure;

Fig. 2 is a schematic diagram of the appearance of the motor rotor of the present invention;

Fig. 3 is the schematic diagram of the state in which the magnet is adsorbed on the periphery of the silicon steel sheet in the utility model;

Fig. 4 is a cross-sectional view of the structure between the plastic shell, the silicon steel sheet and the magnet in the utility model;

Fig. 5 is the exploded view of the structure of the magnet and the silicon steel sheet in the utility model;

Fig. 6 is a sectional view of the cross-sectional structure between the plastic shell, the silicon steel sheet and the magnet in the utility model;

Fig. 7 is a partially enlarged view between the magnet and the silicon steel sheet in the utility model.

Explanation of reference signs: 10-motor shaft; 20-silicon steel sheet; 21-bump; 211-bevel; 30-magnet; 31-oblique cut; 32-arc fitting surface; 40-viscose; 50-plastic shell.

Detailed ways

Below, according to the technical means of the present invention, enumerate the mode suitable for the implementation of the present invention, and cooperate with drawings to explain as follows:

The basic structure of the motor rotor used in this utility model is shown in Figures 2 to 4, mainly composed of several silicon steel sheets 20 stacked on the motor shaft 10, and several magnets 30 fixed on the periphery of the silicon steel sheet 20. ; Wherein, except that the magnet 30 can be adsorbed on the peripheral surface of the silicon steel sheet 20 (as shown in FIG. 3 ) through magnetic adsorption, and in the way of injection molding, a thermoplastic structure is used to wrap the magnet 30 and the silicon steel sheet 20 The overall fixing structure of the combined plastic shell 50 basically uses the plastic shell 50 to securely combine and fix the magnet 30 and the silicon steel sheet 20, thereby preventing the magnet from being thrown out.

As shown in Fig. 5 and Fig. 6, each silicon steel sheet 20 is further provided with a bump 21 for positioning the magnet 30 at its position corresponding to the magnet 30; A bevel 211 is formed on both sides (see Figure 7), and oblique cuts 31 matching the bevel 211 are formed on both sides of the magnet 30, and the positioning effect between the magnet 30 and the silicon steel sheet 20 is strengthened by using bumps 21 When the motor rotor generates an inertial force due to starting rotation or braking and stopping, the bump 21 bears the inertial force, so as to avoid relative displacement between the magnet 30 and the silicon steel sheet 20, and reduce the factors that damage the fixed structure , improve the reliability and service life of the motor rotor.

Furthermore, the bottom of each magnet 30 in the utility model has an arc-shaped bonding surface 32 that fits with the peripheral surface of the silicon steel sheet 20, and its top has an arched enclosing surface 33 that slopes toward both sides. The structural material of the plastic shell 50 relatively located between the magnets 30 is increased, thereby enhancing the coating effect on all the silicon steel sheets 20 .

Please refer to Figure 6 and Figure 7 at the same time, each magnet 30 is mainly formed by the bumps 21 on the outer surface of the silicon steel sheet 20 to form a positioning function with the silicon steel sheet 20, so all the magnets 30 do not need to be arranged in a tightly bonded manner , so that an appropriate gap can be maintained between the magnets 30, in addition to allowing the structural material of the plastic shell 50 to enter the gap between the magnets 30, and strengthening the fixed bonding effect between the magnet 30 and the silicon steel sheet 20, it is also possible to use plastic The material properties of the shell 50 provide a cushioning effect between the magnets 20 .

The above description is only illustrative, rather than restrictive, of the present utility model. Those of ordinary skill in the art understand that many modifications, changes or equivalents can be made without departing from the spirit and scope defined in the claims. But all will fall within the limitable scope of the claims of the present utility model.

Claims (5)

1. the magnetite of a motor rotor and silicon steel sheet fixing structure, its motor rotor is to be stacked with several silicon steel sheets on motor shaft, and disposes several magnetites in the silicon steel sheet periphery; It is characterized in that:

Each silicon steel sheet corresponds to position between each magnetite and is provided with salient point for the magnetite location, and a plastic housing in order to magnetite is combined with the silicon steel sheet coating.

2. according to the magnetite and the silicon steel sheet fixing structure of the described motor rotor of claim 1, it is characterized in that: be to have the gap between each magnetite.

3. according to the magnetite and the silicon steel sheet fixing structure of the described motor rotor of claim 1, it is characterized in that: each salient point is to be formed with an oblique angle in its both sides, and the both sides of each magnetite are formed with the angular cut that matches with the oblique angle.

4. according to the magnetite and the silicon steel sheet fixing structure of the described motor rotor of claim 1, it is characterized in that: the bottom of each magnetite is to have the circular arc binding face that fits with the silicon steel sheet peripheral surface.

5. according to the magnetite and the silicon steel sheet fixing structure of claim 1 or 4 described motor rotors, it is characterized in that: the top of each magnetite has the low oblique arch form inclusion face towards both sides.

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