Motor magnetic steel fixing structure

Abstract

The utility model relates to a motor magnetic steel fixing structure, which comprises a motor shell, a retainer, at least two magnetic steels and at least one elastic separator, the side wall of the motor shell is partially recessed inwards to form at least one salient point, and the salient point forms a guide limiting body; the retainer is placed at the bottom of an inner cavity of the motor shell and comprises a ring body and a first limiting body, and the shape of the ring body is matched with the section shape of the inner cavity of the motor shell; the first limiting body is vertically arranged on the ring body, and a guide limiting groove matched with the guide limiting body is formed in the first limiting body; the elastic separator is arranged in an inner cavity of the motor shell, the first limiting body and the elastic separator are matched to separate out installation positions with the same number as the magnetic steel, each installation position is provided with one magnetic steel, and the magnetic steel abuts against the inner side wall of the motor shell and the ring body. According to the utility model, the magnetic steel can be reliably fixed without stamping a convex hull strip on the motor shell, and the strength of the motor shell is high.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor magnet fixing structure. Background Technology

[0002] Some motors require several magnets to be installed inside the motor housing. To secure the magnets, a long, raised strip is usually punched into the side of the motor housing, extending to the end face of the housing. Figure 1 and Figure 2 As shown. However, for some motor housings with large wall thicknesses, it is difficult to effectively stamp out the shape of the raised strip on the motor housing, thus making it impossible to fix the magnet. In addition, stamping the raised strip will also affect the strength of the motor housing. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a motor magnet fixing structure that can reliably fix the magnet without stamping out a convex strip on the motor housing.

[0004] To achieve the above objectives, this utility model discloses a motor magnet fixing structure, which includes a motor housing, a retainer, at least two magnets, and at least one elastic isolator. The sidewall of the motor housing is partially recessed inward to form at least one protrusion, which constitutes a guide limiting body. The retainer is placed at the bottom of the inner cavity of the motor housing. The retainer includes a ring and a first limiting body, the shape of which is adapted to the cross-sectional shape of the inner cavity of the motor housing. The first limiting body is vertically disposed on the ring and has a guide limiting groove adapted to the guide limiting body. The elastic isolator is placed in the inner cavity of the motor housing. The first limiting body and the elastic isolator cooperate to create mounting positions equal to the number of magnets. Each mounting position holds one magnet, and the magnet abuts against the inner sidewall of the motor housing and the ring.

[0005] After the above setup, by stamping small protrusions on the motor housing and having the guide limiting body formed by the protrusions engage with the guide limiting groove on the cage, the cage's rotation can be restricted. The ring shape of the cage matches the cross-sectional shape of the inner cavity of the motor housing, ensuring that the cage will not wobble, thus providing a reliable mounting base for the magnets. Furthermore, by using the first limiting body and the elastic spacer to create mounting positions equal in number to the magnets, the magnets can be reliably fixed. This invention only requires stamping small protrusions on the motor housing, greatly reducing the processing difficulty and minimizing the impact on the strength of the motor housing.

[0006] The ring body is also provided with at least one second limiting body, and the limiting body corresponds one-to-one with the elastic isolator; the sum of the thickness of the ring body, the length of the first limiting body, and the length of the elastic isolator is not greater than the inner cavity depth of the motor housing. By setting the second limiting body, it can be used to separate the magnets and ensure that the magnets can be smoothly inserted into the inner cavity of the motor housing.

[0007] The ring body is also provided with at least four support bosses for supporting magnets, with each magnet corresponding to at least two support bosses; the surfaces of all the support bosses are on the same plane, and this plane is perpendicular to the axial direction of the motor. By setting support bosses to support the magnets, the end face of the magnet does not need to be in full contact with the ring body, which can reduce the impact of insufficient flatness of the large plane on the position of the magnet.

[0008] When there are two or more protrusions, the protrusions are spaced apart on the same straight line, and this straight line is parallel to the axis of the motor. This arrangement ensures the guiding effect on the cage.

[0009] The number of protrusions is two.

[0010] The cage is made of resin. This cage design allows for injection molding, thus ensuring the cage's precision.

[0011] The bottom of the inner cavity of the motor housing is provided with several stiffening ribs, which are evenly distributed around the circumference. The stiffening ribs can enhance the strength of the motor housing.

[0012] The ring body is provided with several support feet, which abut against the bottom of the inner cavity of the motor housing, and the support feet are offset from the stiffening ribs; or, the support feet press against the stiffening ribs. With this arrangement, the ring body has higher strength (i.e., the support feet act as a stiffening body), and at the same time, the ring body does not need to be in full contact with the bottom of the inner cavity of the motor housing, which can reduce the impact of the contact surface fitting accuracy on the magnet installation accuracy.

[0013] By adopting the above solution, small protrusions are stamped on the motor housing, and the guide limiting body formed by these protrusions engages with the guide limiting groove on the cage, thus restricting the cage's rotation. The ring shape of the cage matches the cross-sectional shape of the inner cavity of the motor housing, ensuring that the cage will not wobble, thereby providing a reliable mounting base for the magnets. Furthermore, by using the first limiting body and the elastic isolator to create mounting positions equal in number to the magnets, the magnets can be reliably fixed. This invention only requires stamping small protrusions on the motor housing, greatly reducing the processing difficulty and minimizing the impact on the strength of the motor housing. Attached Figure Description

[0014] Figure 1 This is one of the schematic diagrams of the installation structure of existing motor magnets;

[0015] Figure 2 This is the second schematic diagram of the installation structure of existing motor magnets;

[0016] Figure 3 This is a schematic diagram of the present invention;

[0017] Figure 4 This is a schematic diagram from another perspective of the present invention;

[0018] Figure 5 This is a cross-sectional view of the present invention;

[0019] Figure 6 This is an exploded view of the present invention;

[0020] Figure 7 This is a schematic diagram of the motor housing;

[0021] Figure 8 This is a schematic diagram of a cage.

[0022] Label Explanation:

[0023] 10. Motor housing; 11. Stiffening ribs; 12. Protrusions;

[0024] 20; ring body; first limiting body 22; second limiting body 23; support boss 24; support foot 25; guide limiting groove 26;

[0025] Magnet 30;

[0026] Flexible isolation element 40. Detailed Implementation

[0027] The present invention will now be described with reference to the accompanying drawings.

[0028] like Figure 3-8 As shown, this utility model discloses a motor magnet fixing structure, which includes a motor housing 10, a retainer 20, at least two magnets 30 and at least one elastic isolator 40. In this case, the example of setting three magnets 30 and two elastic isolators 40 is used for illustration.

[0029] Several stiffening ribs 11 are provided at the bottom of the inner cavity of the motor housing 10. The stiffening ribs 11 are evenly distributed around the bottom circumference of the inner cavity of the motor housing 10, and the stiffening ribs 11 can enhance the strength of the motor housing 10. At least one protrusion 12 is formed by a partial inward recess on the side wall of the motor housing 10. The protrusion 12 constitutes a guide limiter for cooperating with the cage 20 to achieve the positioning of the cage 20. The protrusion 12 is formed by stamping on the motor housing 10. In this embodiment, two protrusions 12 are provided. When there are two or more protrusions 12, the protrusions 12 are spaced apart, and all protrusions 12 are on the same straight line, and the straight line is parallel to the output shaft of the motor.

[0030] The retainer 20 is made of resin and can be obtained by injection molding to ensure its precision. The retainer 20 is placed at the bottom of the inner cavity of the motor housing 10. The retainer 20 includes an integrally formed ring 21, a first limiting body 22, at least one second limiting body 23, at least four support bosses 24, and several support feet 25. The shape of the ring 21 is adapted to the cross-sectional shape of the inner cavity of the motor housing 10. The ring 21 has a first surface and a second surface, which are oriented in opposite directions. The first limiting body 22, the second limiting body 23, and the support bosses 24 are located on the first surface, while the support feet 25 are located on the second surface.

[0031] The support feet 25 are evenly distributed circumferentially on the second surface (irregular distribution of the support feet 25 is also acceptable). When the retainer 20 is placed at the bottom of the inner cavity of the motor housing 10, the support feet 25 and the stiffening ribs 11 are offset to avoid conflict. At the same time, the support feet 25 also abut against the bottom of the inner cavity of the motor housing 10, thereby reliably supporting the ring body 21 and increasing the strength of the ring body 21. In addition, the ring body 21 does not need to be in full contact with the bottom of the inner cavity of the motor housing 10, which can reduce the impact of the contact surface fitting accuracy on the installation accuracy of the magnet 30. Alternatively, the support feet 25 can directly press against the stiffening ribs 11, which achieves the same effect.

[0032] After the retainer 20 is installed in place, the first surface of the ring 21 is perpendicular to the axial direction of the motor. The first limiting body 22 is perpendicular to the first surface of the ring 21 and has a certain length to ensure reliable isolation of the magnet 30. The first limiting body 22 is provided with a guide limiting groove 26 that matches the guide limiting body. When assembling the retainer 20, the guide limiting groove 26 is aligned with the guide limiting body, so that the retainer 20 can be smoothly inserted into the inner cavity of the motor housing 10. At the same time, due to the constraint of the guide limiting body, the retainer 20 will not rotate.

[0033] The number of second limiting bodies 23 corresponds to the number of elastic isolation members 40. The width of the second limiting body 23 can be equal to the width of the first limiting body 22. The setting of the second limiting body 23 can separate the magnet 30, which is conducive to the installation of the magnet 30. At this time, the gap between the first limiting body 22 and its adjacent second limiting body 23, as well as the gap between two adjacent second limiting bodies 23, constitute the preliminary shape of the installation position.

[0034] The elastic isolator 40 is placed in the inner cavity of the motor housing 10, and an elastic isolator 40 is provided above each second limiting body 23. The first limiting body 22 and the elastic isolator 40 cooperate to separate the number of mounting positions equal to the number of magnets 30. A magnet 30 is placed in each mounting position, and the magnet 30 abuts against the inner side wall of the motor housing 10 and the first surface of the ring 21.

[0035] To ensure that the assembly of the motor is not interfered with, the total thickness of the ring 21 (including the thickness of the support foot 25), the length of the first limiting body 22, and the length of the elastic isolator 40 shall not exceed the inner cavity depth of the motor housing 10.

[0036] Each magnet 30 corresponds to at least two support bosses 24. The support bosses 24 are used to support the magnet 30. The surfaces of all the support bosses 24 are on the same plane, and this plane is perpendicular to the axis of the motor. This arrangement allows the end face of the magnet 30 to avoid contacting the ring body 21 as a whole, which can reduce the impact of insufficient flatness of the large plane on the position of the magnet 30.

[0037] The key to this invention lies in the fact that by stamping small protrusions 12 on the motor housing 10, and ensuring that the guide limiting body formed by the protrusions 12 engages with the guide limiting groove 26 on the retainer 20, the retainer 20 can be restricted from rotation. The ring 21 of the retainer 20 is adapted to the cross-sectional shape of the inner cavity of the motor housing 10, ensuring that the retainer 20 will not wobble, thus providing a reliable mounting base for the magnet 30. Furthermore, by using the first limiting body 22 in conjunction with the elastic isolator 40 to create mounting positions equal in number to the magnets 30, the magnets 30 can be reliably fixed. This invention only requires stamping small protrusions 12 on the motor housing 10, greatly reducing the processing difficulty and minimizing the impact on the strength of the motor housing 10.

[0038] The above description is merely an embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A motor magnet fixing structure, characterized in that: The device includes a motor housing, a cage, at least two magnets, and at least one elastic isolator. The sidewall of the motor housing is partially recessed inward to form at least one protrusion, which constitutes a guide limiting body. The cage is placed at the bottom of the inner cavity of the motor housing and includes a ring and a first limiting body. The shape of the ring is adapted to the cross-sectional shape of the inner cavity of the motor housing. The first limiting body is vertically disposed on the ring and has a guide limiting groove adapted to the guide limiting body. The elastic isolator is placed in the inner cavity of the motor housing. The first limiting body and the elastic isolator cooperate to create mounting positions equal in number to the number of magnets. Each mounting position holds one magnet, and the magnet abuts against the inner sidewall of the motor housing and the ring.

2. The motor magnet fixing structure according to claim 1, characterized in that: The ring body is also provided with at least one second limiting body, and the limiting body corresponds one-to-one with the elastic isolation member; the sum of the thickness of the ring body, the length of the first limiting body and the length of the elastic isolation member is not greater than the inner cavity depth of the motor housing.

3. The motor magnet fixing structure according to claim 1, characterized in that: The ring body is also provided with at least four support bosses for supporting magnets, and each magnet corresponds to at least two support bosses; the surfaces of all the support bosses are on the same plane, and the plane is perpendicular to the axis of the motor.

4. The motor magnet fixing structure according to claim 1, characterized in that: When there are two or more protrusions, the protrusions are spaced apart on the same straight line, and the straight line is parallel to the axis of the motor.

5. The motor magnet fixing structure according to claim 1, characterized in that: The number of protrusions is two.

6. The motor magnet fixing structure according to claim 1, characterized in that: The cage is made of resin.

7. The motor magnet fixing structure according to claim 1, characterized in that: The bottom of the inner cavity of the motor housing is provided with several stiffening ribs, which are evenly distributed around the circumference.

8. The motor magnet fixing structure according to claim 7, characterized in that: The ring body is provided with several support feet, which abut against the bottom of the inner cavity of the motor housing, and the support feet are offset from the stiffening ribs; or, the support feet press against the stiffening ribs.

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