Rotor assembly and motor

Abstract

The invention provides a rotor assembly and a motor. The rotor assembly comprises a rotor core provided with magnetic steel grooves; magnetic steel is inserted into the magnetic steel grooves; a gap is formed between the magnetic steel and the side wall of the magnetic steel groove; and the fastener comprises an insertion sheet, the insertion sheet is inserted in the gap, and two side surfaces of the insertion sheet are respectively abutted against the magnetic steel and the side wall. According to the invention, the fasteners are arranged between the magnetic steel and the magnetic steel grooves, so that the magnetic steel can be prevented from falling off under the condition of no-glue bonding without coating glue on the magnetic steel, and the problems that the magnetic steel is not easy to take out when glue exists and the error-tolerant rate is relatively low can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of electric motors, and in particular relates to a rotor assembly and an electric motor. Background Art

[0002] Motor is an electrical device that uses the principle of electromagnetic induction to perform electromechanical energy conversion or signal transmission. Motors are widely used in the national economy. For example, in the power system, motors are the prime movers of various rotating machines; in the factory, "turning, milling, planing, grinding, drilling" and other machine tools are driven by motors; electric locomotives and trolleybuses in transportation are also driven by motors; threshers, harvesters, flour mills and pumps used in rural areas are also inseparable from motors; many equipment in cultural, educational and medical systems are driven by motors, and the automatic control systems of radar antennas and artificial satellites in national defense also use many micromotors called control motors as components to work and execute commands; most of the household appliances in daily life cannot do without motors. In other words, the application of motors has been applied to various fields of the national economy. Our daily life cannot do without motors, and motors are inextricably linked to our lives. Motors are vital to our lives.

[0003] The motor is an electrical equipment with a history of more than 180 years. If its technology is combined with the latest modern science and technology, the motor industry will be further developed and will play a more important role in the national economy. People are also constantly improving the technology of motors and optimizing them to improve their various performances and better serve our lives.

[0004] The core components of the motor mainly include the stator assembly, the rotor assembly, and the front and rear end covers. Among them, the rotor assembly includes the rotor core, the rotor shaft, and the magnet. The magnet is divided into built-in magnet and surface-mounted magnet. The following takes the built-in magnet as an example. For magnets, magnets are a relatively fragile component. For installation, they are matched with the magnet slots on the rotor core with a small gap, and then glue is applied to the magnet surface. Once the installation is wrong, it is difficult to remove. In addition, during the production process of the motor, if you forget to apply glue, it is difficult to check it out, which creates the risk of the magnet being thrown out during the operation of the motor. Summary of the invention

[0005] Therefore, the present application provides a rotor assembly and a motor, which can solve the problem in the prior art that the magnetic steel may be thrown out due to forgetting to apply glue on the magnetic steel.

[0006] In order to solve the above problems, the present application provides a rotor assembly, comprising:

[0007] The rotor core is provided with a magnetic steel slot; a magnetic steel is inserted into the magnetic steel slot; a gap is provided between the magnetic steel and the side wall of the magnetic steel slot;

[0008] The fastener comprises an insert, wherein the insert is inserted in the gap, and two side surfaces thereof respectively abut against the magnetic steel and the side wall.

[0009] In some embodiments,

[0010] The fastener also includes a shielding portion, and one end of the insert is arranged on the shielding portion; the shielding portion abuts against the exposed surface of the magnetic steel.

[0011] In some embodiments,

[0012] The inserts are provided with two, which are respectively arranged on two sides of the magnetic steel.

[0013] In some embodiments,

[0014] The two inserts and the shielding portion form a U-shaped slot body, and part of the magnetic steel is located in the slot body.

[0015] In some embodiments,

[0016] The distance between the opposite inner walls of the slot body is smaller than the thickness of the magnetic steel, while the distance between the opposite outer walls is smaller than the width of the magnetic steel slot.

[0017] In some embodiments,

[0018] The shielding portion is also provided with an action portion, and the action portion is located in the magnetic steel groove; when force is applied to the action portion, the fastener can be made to leave the gap.

[0019] In some embodiments,

[0020] Two fasteners are provided on one axial end of the magnetic steel slot; the two fasteners are symmetrically arranged.

[0021] In some embodiments,

[0022] On the cross section of the rotor core, an air slot is provided at each end of the magnetic steel slot along the length direction, and the magnetic steel is arranged between the two air slots; when an action portion is provided on the fastener, the action portion is located in the air slot.

[0023] According to another aspect of the present application, a motor is provided, comprising the rotor assembly as described above.

[0024] A rotor assembly provided in the present application includes: a rotor core, provided with a magnetic steel slot; a magnetic steel is inserted in the magnetic steel slot; a gap is provided between the magnetic steel and the side wall of the magnetic steel slot; a fastener, including an insert, the insert is inserted in the gap, and two side surfaces respectively abut the magnetic steel and the side wall.

[0025] This application has the following beneficial effects:

[0026] By setting fasteners between the magnet and the magnet groove, there is no need to apply glue on the magnet, which can prevent the magnet from falling off in the absence of glue bonding, and can overcome the problem that the magnet is difficult to remove when glue is present and the fault tolerance rate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the implementation methods or the prior art descriptions. The drawings described below are merely exemplary, and for those of ordinary skill in the art, other implementation drawings can be derived from the provided drawings without creative work.

[0028] Figure 1 This is a schematic structural diagram of a rotor assembly according to an embodiment of the present application;

[0029] Figure 2 This is a schematic structural diagram of a rotor core according to an embodiment of the present application;

[0030] Figure 3 For the embodiment of this application Figure 1 Middle partial enlarged picture;

[0031] Figure 4 A schematic diagram of the structure of a fastener according to an embodiment of the present application;

[0032] Figure 5 For the embodiment of this application Figure 4 Schematic diagram of the size structure of the fastener;

[0033] Figure 6 This is another schematic diagram of the structure of the fastener according to an embodiment of the present application;

[0034] Figure 7 For the embodiment of this application Figure 6 Schematic diagram of the size structure of the fastener;

[0035] Figure 8 A structural cross-sectional view of a rotor assembly according to an embodiment of the present application;

[0036] Fig. 9 For the embodiment of this application Figure 8 Middle partial enlarged picture;

[0037] Fig.10 Another structural cross-sectional view of the rotor assembly according to an embodiment of the present application;

[0038] Fig.11 For the embodiment of this application Fig.10 A partial enlarged view.

[0039] The reference numerals are:

[0040] 1. Rotor core;

[0041] 2. Magnetic steel slot; 21. Main slot; 22. Air slot;

[0042] 3. Fastener; 31. Insert; 32. Shielding portion; 33. Action portion;

[0043] 4. Magnetic steel. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0046] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0047] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0048] See also Figures 1 to 11 As shown, according to an embodiment of the present application, a rotor assembly includes:

[0049] The rotor core 1 is provided with a magnetic steel slot 2; a magnetic steel 4 is inserted into the magnetic steel slot 2; and a gap is provided between the magnetic steel 4 and the side wall of the magnetic steel slot 2;

[0050] The fastener 3 includes an insert 31, which is inserted into the gap, and two side surfaces of the insert 31 abut against the magnetic steel 4 and the side wall respectively.

[0051] The present application sets a fastener 3 between the magnet 4 and the magnet slot 2, without applying glue on the magnet 4, so as to prevent the magnet 4 from falling off in the absence of glue bonding, and can overcome the problem that the magnet 4 is difficult to remove when glue is present and the fault tolerance rate is low.

[0052] In the gap between the magnetic steel 4 and the magnetic steel slot 2, the fastener 3 is inserted to fill the gap between the magnetic steel 4 and the magnetic steel slot 2, and the two side surfaces of the insert 31 are in abutting contact with the magnetic steel 4 and the magnetic steel slot 2, which is equivalent to the insert 31 filling the gap in an extrusion manner; based on the extrusion of the magnetic steel 4 and the magnetic steel slot 2 by the insert 31, the friction between the two is increased, so that the magnetic steel 4 can be firmly set in the magnetic steel slot 2, so that there is no need to apply glue to enhance the connection stability of the magnetic steel 4 and the magnetic steel slot 2.

[0053] In addition, since the insert 31 is squeezed between the magnet 4 and the magnet slot 2, the magnet 4 is fixed in the axial and radial directions and is not easy to fall off. The rotor baffle in the traditional structure to prevent the magnet 4 from falling off can be omitted, reducing parts and saving costs.

[0054] Furthermore, since the insert 31 is inserted in the gap, the insert 31 can be removed; the traditional use of glue for bonding is inconvenient to remove the magnetic steel 4 in the magnetic steel slot 2. For example, the magnetic steel 4 is inserted into the magnetic steel slot 2 in the reverse direction, but because of the glue, it is very inconvenient to remove, resulting in a low fault tolerance rate of the product. The insert 31 of the present application is a removable component. If it is found that the magnetic steel 4 is inserted incorrectly and the insertion direction needs to be changed, the insert 31 is removed. Combined with the gap fit between the magnetic steel 4 and the magnetic steel slot 2, it is very easy to remove, thereby improving the fault tolerance rate of the product.

[0055] In some embodiments,

[0056] The fastener 3 further includes a shielding portion 32 , and one end of the insert 31 is disposed on the shielding portion 32 ; the shielding portion 32 abuts against the exposed surface of the magnetic steel 4 .

[0057] The fastener 3 also includes a shielding portion 32 for blocking the exposed surface of the magnet 4, wherein the exposed surface of the magnet 4 refers to the magnet 4 being inserted into the magnet slot 2 along the axial direction of the rotor core 1, and the end surface of the magnet 4 along the axial direction of the rotor core 1 is not covered by the magnet slot 2 to form an exposed surface; the direction in which the magnet 4 falls off from the magnet slot 2 is also along the axial direction of the rotor core 1. The present application provides a shielding portion 32 on the fastener 3 to abut the exposed surface of the magnet 4, thereby further preventing the magnet 4 from falling off, and no glue and rotor baffle are required.

[0058] In some embodiments,

[0059] There are two inserting pieces 31 , which are disposed on both sides of the magnetic steel 4 .

[0060] Two inserts 31 are provided, respectively inserted at two sides of the magnetic steel 4 , which can further enhance the stability of the magnetic steel 4 .

[0061] In some embodiments,

[0062] The two inserts 31 and the shielding portion 32 form a U-shaped slot, and part of the magnetic steel 4 is located in the slot.

[0063] One end of the two inserts 31 is arranged on the shielding part 32, so that the two inserts 31 and the shielding part 32 form a U-shaped groove body, and can also form a π-shaped structure in cross section. The inserts 31 only squeeze the end of the magnetic steel 4 instead of filling the entire gap, which saves materials and facilitates removal.

[0064] In some embodiments,

[0065] The distance between the opposite inner walls of the slot body is smaller than the thickness of the magnetic steel 4 , while the distance between the opposite outer walls is smaller than the width of the magnetic steel slot 2 .

[0066] In the specific structural setting, the distance between the relative inner walls of the slot body is slightly smaller than the thickness of the magnetic steel 4, so that when the end of the magnetic steel 4 is located in the slot body, the two inserts 31 will expand outward; combined with the fact that the distance between the opposite outer walls of the slot body is also smaller than the width of the slot steel slot, the inserts 31 can be tightly against the inner wall of the magnetic steel slot 2, and the friction force is relatively large, so that the magnetic steel 4 is fixed in both the axial and radial directions.

[0067] During the assembly process, firstly, the magnet 4 is correctly placed into the magnet slot 2, wherein the thickness of the magnet 4 is smaller than the width of the magnet slot 2, and the magnet 4 and the magnet slot 2 are clearance-matched. After the magnet 4 is placed in place, the slot body composed of two inserts 31 and the covering part covers the magnet 4 and squeezes it so that the two inserts 31 are inserted along the gap. At this time, the exposed surface of the magnet 4 abuts against the bottom surface of the slot body, and the installation is completed.

[0068] If it is subsequently found that there is a problem with the installation of the magnet 4 or the polarity of the magnet 4 is installed in the opposite direction, the magnet 4 needs to be removed, and force needs to be applied to the fastener 3 to disengage it from the gap.

[0069] In some embodiments,

[0070] The shielding portion 32 is further provided with an acting portion 33 , and the acting portion 33 is located in the magnetic steel slot 2 ; when force is applied to the acting portion 33 , the fastener 3 can be made to leave the gap.

[0071] In order to facilitate the removal of the fastener 3 inserted into the gap, an action portion 33 is provided on the shielding portion 32 so that force can be applied to the action portion 33 when the fastener 3 is removed, including by knocking, lifting, etc.

[0072] Compared with the structure in which the shielding portion 32 is not provided with the action portion 33 , the fastener 3 provided with the action portion 33 is less difficult to remove and is easier to operate.

[0073] In some embodiments,

[0074] Two fasteners 3 are provided on one axial end of the magnetic steel slot 2; the two fasteners 3 are symmetrically arranged.

[0075] Two symmetrically arranged fasteners 3 are arranged on one axial end of the magnetic steel slot 2 to improve the balance and operation stability of the rotor.

[0076] In some embodiments,

[0077] In the cross section of the rotor core 1 , an air slot 22 is provided at each end of the magnetic steel slot 2 along the length direction, and the magnetic steel 4 is arranged between the two air slots 22 ; when an action portion 33 is provided on the fastener 3 , the action portion 33 is located in the air slot 22 .

[0078] In a conventional rotor core 1 structure, on the cross section of the rotor core 1, after the magnetic steel 4 is inserted into the magnetic steel slot 2, air slots 22 are provided at both ends in the length direction thereof for magnetic isolation; the present application arranges the action portion 33 in the air slot 22, utilizing the space there to facilitate applying force to the action portion 33 and removing the fastener 3.

[0079] According to another aspect of the present application, a motor is provided, comprising the rotor assembly as described above.

[0080] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0081] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A rotor assembly, characterized in that: include: A rotor core (1) is provided with a magnetic steel slot (2); a magnetic steel (4) is inserted into the magnetic steel slot (2); and a gap is provided between the magnetic steel (4) and the side wall of the magnetic steel slot (2); The fastener (3) comprises an insert (31), wherein the insert (31) is inserted into the gap, and two side surfaces thereof respectively abut against the magnetic steel (4) and the side wall.

2. The rotor assembly according to claim 1, characterized in that: The fastener (3) further comprises a shielding portion (32), one end of the insert (31) being arranged on the shielding portion (32); the shielding portion (32) abuts against the exposed surface of the magnetic steel (4).

3. The rotor assembly according to claim 1 or 2, characterized in that: The inserting pieces (31) are provided in two pieces and are respectively arranged on two sides of the magnetic steel (4).

4. The rotor assembly according to claim 3, characterized in that: The two inserts (31) and the shielding portion (32) form a U-shaped slot body, and part of the magnetic steel (4) is located in the slot body.

5. The rotor assembly according to claim 4, characterized in that: The distance between the opposite inner walls of the slot body is smaller than the thickness of the magnetic steel (4), while the distance between the opposite outer walls is smaller than the width of the magnetic steel slot (2).

6. The rotor assembly according to claim 5, characterized in that: The shielding portion (32) is also provided with an action portion (33), and the action portion (33) is located in the magnetic steel groove (2); when force is applied to the action portion (33), the fastener (3) can be caused to leave the gap.

7. The rotor assembly according to claim 1 or 6, characterized in that: Two fasteners (3) are provided on one axial end of the magnetic steel slot (2); the two fasteners (3) are symmetrically arranged.

8. The rotor assembly according to claim 7, characterized in that: On the cross section of the rotor core (1), an air slot (22) is provided at each end of the magnetic steel slot (2) along the length direction, and the magnetic steel (4) is arranged between the two air slots (22); when an action portion (33) is provided on the fastener (3), the action portion (33) is located in the air slot (22).

9. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 8.

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