Rotor assembly and motor

Abstract

The invention provides a rotor assembly and a motor. The rotor assembly comprises a rotor iron core, the rotor iron core comprises an inner rotor iron core and an outer rotor iron core, and the outer rotor iron core is annular and sleeves and is connected to the periphery of the inner rotor iron core; the outer circumferential wall of the inner rotor core is provided with a recess in the radial direction, the inner wall of the recess and the inner wall of the outer rotor core define a magnetic steel groove, and magnetic steel is arranged in the magnetic steel groove. The outer rotor iron core is connected to the inner rotor iron core, a stable magnetic steel groove structure is defined, the magnetic steel can be locked without filling injection molding materials, and the structural stability of high-speed operation is achieved.

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] With the continuous improvement of motor efficiency requirements, the design direction of motor rotors has gradually shifted from surface-mounted rotors to embedded rotors. Conventional embedded rotor cores are made by punching out slots for magnetic tiles through a circular core. In order to ensure strength and reduce magnetic leakage, a magnetic isolation bridge is usually set on the core. Since the use of the magnetic isolation bridge still causes magnetic leakage, the amount of material used increases. Therefore, various stamping forms such as semi-segmented magnetic isolation bridge cores and large-rotation magnetic isolation bridge cores have emerged. This not only increases the difficulty of core stamping, but also the utilization rate of the core is not high during stamping, resulting in a lot of waste.

[0003] Some manufacturers have also launched embedded rotors that combine inner rotor cores and outer rotor cores. The inner and outer rotor cores and magnetic tiles cannot be fastened and locked by themselves, and require the help of external injection molding to fasten and form. Under high-speed operation, the injection molding plastic is prone to cracking. Summary of the invention

[0004] Therefore, the present application provides a rotor assembly and a motor, which can solve the problem in the prior art that the embedded rotor in which the inner rotor core and the outer rotor core are combined is prone to cracking of the injection molded plastic under high-speed operation.

[0005] In order to solve the above problems, the present application provides a rotor assembly, comprising:

[0006] The rotor core comprises an inner rotor core and an outer rotor core, wherein the outer rotor core is annular and is sleeved and connected to the outer periphery of the inner rotor core;

[0007] A radial depression is provided on the outer peripheral wall of the inner rotor core, and the inner wall of the depression and the inner wall of the outer rotor core form a magnetic steel groove, in which a magnetic steel is provided.

[0008] In some embodiments,

[0009] There are multiple recesses, which are evenly distributed along the circumference of the rotor core; the interval between two adjacent recesses forms a connecting tooth, and the outer rotor core is connected to the outer end of the connecting tooth away from the inner rotor core.

[0010] In some embodiments,

[0011] A clamping assembly is provided on the outer end of the connecting tooth and the inner wall of the outer rotor core, so that the outer rotor core is clamped on the connecting tooth.

[0012] In some embodiments,

[0013] The clamping assembly includes a dovetail groove and a dovetail tenon that are butted against each other, one of the dovetail groove and the dovetail tenon is arranged on the outer end of the connecting tooth, and the other is arranged on the inner wall of the outer rotor core.

[0014] In some embodiments,

[0015] The recess is configured in an arc shape along the circumferential direction of the rotor core, and the magnetic steel is configured in a magnetic shoe and matches the shape of the recess.

[0016] In some embodiments,

[0017] The rotor assembly also includes an injection molded part, which is filled in the gap between the inner rotor core and the outer rotor core and between the magnetic steel and the magnetic steel slot.

[0018] In some embodiments,

[0019] Along the axial direction of the rotor core, the injection molded part also covers the axial ends of the inner rotor core, the magnetic steel and the outer rotor core.

[0020] In some embodiments,

[0021] The inner rotor core and the outer rotor core are both provided with through holes penetrating along the axial direction of the rotor core, and the injection molded parts are filled in the through holes.

[0022] According to another aspect of the present application, a motor is provided, comprising the rotor assembly as described above.

[0023] A rotor assembly provided in the present application includes: a rotor core, including an inner rotor core and an outer rotor core, wherein the outer rotor core is annular, sleeved and connected to the outer periphery of the inner rotor core; a radial recess is provided on the outer peripheral wall of the inner rotor core, and the inner wall of the recess and the inner wall of the outer rotor core form a magnetic steel groove, in which a magnetic steel is provided.

[0024] This application has the following beneficial effects:

[0025] The outer rotor core is connected to the inner rotor core to form a stable magnetic steel slot structure. The magnetic steel can be locked without filling injection molding plastic, thus achieving structural stability for high-speed operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 This is a schematic structural diagram of a rotor assembly according to an embodiment of the present application;

[0028] Figure 2 This is a schematic structural diagram of an outer rotor core according to an embodiment of the present application;

[0029] Figure 3 This is a schematic structural diagram of the inner rotor core of an embodiment of the present application;

[0030] Figure 4 This is a schematic structural diagram of the rotor assembly after plastic sealing according to an embodiment of the present application.

[0031] The reference numerals are as follows:

[0032] 1. outer rotor core; 11. dovetail groove; 12. through hole;

[0033] 2. inner rotor core; 21. recess; 22. connecting teeth; 221. dovetail tenon; 23. through hole;

[0034] 3. Magnetic steel; 4. Plastic sealing part; 5. Shaft hole. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between 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.

[0039] See also Figures 1 to 4 As shown, according to an embodiment of the present application, a rotor assembly includes:

[0040] The rotor core comprises an inner rotor core 2 and an outer rotor core 1, wherein the outer rotor core 1 is annular and sleeved and connected to the outer periphery of the inner rotor core 2;

[0041] A radial recess 21 is provided on the outer peripheral wall of the inner rotor core 2 , and the inner wall of the recess 21 and the inner wall of the outer rotor core 1 form a magnetic steel groove, in which a magnetic steel 3 is provided.

[0042] The present application connects the outer rotor core 1 to the inner rotor core 2 to form a stable magnetic steel slot structure, and can lock the magnetic steel 3 without filling injection molding material, thereby achieving structural stability for high-speed operation.

[0043] The use of the set structure of the inner rotor core 2 and the outer rotor core 1 facilitates the processing and manufacturing of the inner rotor core 2 and the outer rotor core 1 separately, thereby improving the material utilization rate; in particular, the outer rotor core 1 is connected to the outer periphery of the inner rotor core 2, and a magnetic steel slot structure is formed between the two, so that the stability of the magnetic steel 3 arranged in the magnetic steel slot is increased. During high-speed rotation, based on the connection stability of the inner rotor core 2 and the outer rotor core 1, the structural strength can be guaranteed even without the effect of injection molding.

[0044] For a structure in which the magnetic steel 3 is arranged in a magnetic steel slot, an introduction slot may be arranged on the rotor core to guide the magnetic steel 3 to be inserted into the magnetic steel slot.

[0045] In some embodiments,

[0046] There are multiple recesses 21 evenly distributed along the circumference of the rotor core; the interval between two adjacent recesses 21 forms a connecting tooth 22, and the outer rotor core 1 is connected to the outer end of the connecting tooth 22 away from the inner rotor core 2.

[0047] A plurality of recesses 21 are provided to form a plurality of circumferentially uniformly distributed magnetic steel slots, and the connecting teeth 22 between adjacent recesses 21 are used to stably connect the magnetic steel slots to the outer rotor core 1. There is no magnetic isolation bridge structure around the magnetic steel slots, and there is no mutual pulling force between the core and the magnetic steel 3, so that the structural stability of the magnetic steel slots is high.

[0048] In some embodiments,

[0049] A clamping assembly is provided on the outer end of the connecting tooth 22 and the inner wall of the outer rotor core 1 so that the outer rotor core 1 can be clamped on the connecting tooth 22 .

[0050] The connection method between the connecting teeth 22 and the outer rotor core 1 can be achieved by using a snap-on assembly, which is easy to assemble and disassemble. Due to the snap-on connection between the connecting teeth 22 and the outer rotor core 1, the inner rotor core 2 and the outer rotor core 1 have a stable positional relationship in both the radial and circumferential directions, so that the magnetic steel 3 located therebetween will not have stress acting on the magnetic isolation bridge due to high-speed rotation.

[0051] In some embodiments,

[0052] The clamping assembly includes a dovetail groove 11 and a dovetail tenon 221 that are butted against each other, one of the dovetail groove 11 and the dovetail tenon 221 is arranged on the outer end of the connecting tooth 22 , and the other is arranged on the inner wall of the outer rotor core 1 .

[0053] More specifically, the clamping assembly of the present application adopts a dovetail groove 11 and a dovetail tenon 221 that are connected to each other, and one is provided on the outer end of the connecting tooth 22 and the inner wall of the outer rotor core 1, such as Figure 1-3 As shown, a dovetail tenon 221 is provided on the outer end of the connecting tooth 22, and a dovetail groove 11 is provided on the inner wall of the outer rotor core 1. The dovetail tenon 221 and the dovetail groove 11 are connected, that is, inserted relatively along the axial direction of the rotor core, so as to realize the connection between the inner rotor core 2 and the outer rotor core 1.

[0054] The clamping structure of the dovetail groove 11 and the dovetail tenon 221 limits the outer rotor core 1 and the inner rotor core 2 in both radial and circumferential directions, making them difficult to fall off, so that the magnetic steel 3 in the magnetic steel groove is locked, forming a stable embedded rotor structure.

[0055] In some embodiments,

[0056] The recess 21 is configured in an arc shape along the circumferential direction of the rotor core, and the magnetic steel 3 is configured as a magnetic tile and matches the shape of the recess 21 .

[0057] The present application changes the traditional surface-mounted magnetic tile into an embedded magnetic tile structure, which is different from the traditional embedded magnetic steel 3 structure. The rotor of the present application does not have a magnetic isolation bridge, so there will be no breakage and magnetic leakage problems.

[0058] Since the recess 21 is in an arc shape and the opening of the recess 21 is covered by the inner wall of the outer rotor core 1 , the magnetic steel slot structure is a fan-shaped slot, and magnetic tiles of corresponding shapes can be inserted into the slots in a matching manner.

[0059] In some embodiments,

[0060] The rotor assembly further includes an injection molded part, which is filled in the gap between the inner rotor core 2 and the outer rotor core 1 and between the magnetic steel 3 and the magnetic steel slot.

[0061] The inner rotor core 2 and the outer rotor core 1 are stably connected by a snap-on assembly, but there are still gaps between the two and between the magnetic steel 3 and the magnetic steel slot. The present application can use injection molding material to fill them to further improve the structural stability; the inner rotor core 2, the magnetic steel 3 and the outer rotor core 1 are injection molded into one body for easy transportation and assembly.

[0062] In some embodiments,

[0063] Along the axial direction of the rotor core, the injection molded part also covers the axial ends of the inner rotor core 2 , the magnetic steel 3 and the outer rotor core 1 .

[0064] The injection molded parts also cover the inner rotor core 2, the magnetic steel 3 and the ends of the outer rotor core 1 to improve the structural strength of the product and enhance safety.

[0065] In some embodiments,

[0066] The inner rotor core 2 and the outer rotor core 1 are both provided with through holes penetrating along the axial direction of the rotor core, and the injection molded parts are filled in the through holes.

[0067] Axially penetrating through-hole structures are provided on the inner rotor core 2 and the outer rotor core 1, and the injection molded parts are filled in these through-holes before molding, such as Figure 2 and Figure 3 As shown, the outer rotor core 1 is provided with a through hole 12, the inner rotor core 2 is provided with a through hole 23, and combined with the coating structure of the inner rotor core 2, the outer rotor core 1 and the magnetic steel 3 by the injection molding part, the stability of the entire structure is further enhanced.

[0068] According to another aspect of the present application, a motor is provided, comprising the rotor assembly as described above.

[0069] The motor of the present application adopts the above-mentioned rotor assembly, which adopts an embedded magnetic tile structure. The specific structure of the rotor assembly is composed of a rotor core, magnetic tiles, polymer injection molding material, etc. The rotor core is composed of an outer rotor core 1 and an inner rotor core 2 that are engaged with each other through a dovetail mortise and tenon structure to form a fan hole, and the magnetic tiles are placed at the fan hole position. The rotor core is formed by stacking the same outer rotor punchings and inner rotor punchings.

[0070] The structural features of the inner rotor core 2 are mainly the fan-shaped slots evenly spaced in the circumferential direction and the dovetail tenons 221 protruding from the connecting teeth 22 between the fan-shaped slots; wherein the connecting teeth 22 constitute the magnetic isolation bridge structure of the traditional embedded rotor. The structural features of the outer rotor core 1 are mainly the concave dovetail slots 11 evenly spaced in the circumferential direction.

[0071] In this way, the protruding dovetail tenon 221 of the inner rotor core 2 is engaged with the concave dovetail groove 11 of the outer rotor core 1, forming evenly spaced fan holes, the same number of fan holes and the same number of magnetic tiles, forming a rotor assembly in which the core and the magnetic tiles are tightly locked at intervals. The rotor assembly is placed in the mold, and a rotating shaft is inserted into the rotating shaft hole 5 of the inner rotor core 2. After the mold is closed, the filling polymer injection molding material is injected. The injection molding material covers the rotor assembly and the magnetic tiles, and enters part of the cylindrical through holes of the rotor core, so that the core and the magnetic tiles are firmly injection molded, and after molding, it is an embedded rotor assembly.

[0072] The rotor magnetic tile is a fan-shaped magnetic tile, and the fan-shaped groove is set on the magnetic tile close to the rotor core assembly. The magnetic tile is just corresponding to the fan-shaped groove of the rotor core assembly to fix the position of the magnetic tile. The rotor core can be provided with an introduction groove to play an introduction role when the magnetic tile is inserted into the core.

[0073] The inner rotor core 2 and the outer rotor core 1 are manufactured separately. The inner rotor core 2 is formed by regularly stacking inner rotor punching sheets, and the inner rotor core 2 has fan-shaped grooves evenly spaced along the circumference, and a protruding dovetail tenon 221 of the magnetic isolation bridge on the core; the outer rotor punching sheets are regularly stacked to form the outer rotor core 1, and the concave dovetail grooves 11 are evenly spaced along the circumference, and a plurality of cylindrical through holes are formed between the outer rotor core 1 and the inner rotor.

[0074] The motor of the present application has a reasonable and simple structure and is convenient for industrialization; it adopts a multi-purpose and universal innovative design scheme; the outer rotor core 1 and the inner rotor core 2 are engaged with each other using dovetail grooves 11 to enhance magnetic induction and gather magnetic flux, thereby increasing the frequency of the AC voltage and improving the quality of the rectified output DC voltage, thereby improving the energy efficiency of the motor and reducing temperature rise and cost.

[0075] 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.

[0076] 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: The rotor core comprises an inner rotor core (2) and an outer rotor core (1), wherein the outer rotor core (1) is annular and is sleeved on and connected to the outer periphery of the inner rotor core (2); A radial recess (21) is provided on the outer peripheral wall of the inner rotor core (2), and the inner wall of the recess (21) and the inner wall of the outer rotor core (1) form a magnetic steel groove, in which a magnetic steel (3) is provided.

2. The rotor assembly according to claim 1, characterized in that: A plurality of recesses (21) are provided, which are evenly distributed along the circumference of the rotor core; the interval between two adjacent recesses (21) forms a connecting tooth (22), and the outer rotor core (1) is connected to the outer end of the connecting tooth (22) away from the inner rotor core (2).

3. The rotor assembly according to claim 2, characterized in that: A clamping assembly is provided on the outer end of the connecting tooth (22) and the inner wall of the outer rotor core (1), so that the outer rotor core (1) is clamped on the connecting tooth (22).

4. The rotor assembly according to claim 3, characterized in that: The clamping assembly comprises a dovetail groove (11) and a dovetail tenon (221) that are butted against each other, one of the dovetail groove (11) and the dovetail tenon (221) being arranged on the outer end of the connecting tooth (22), and the other being arranged on the inner wall of the outer rotor core (1).

5. The rotor assembly according to any one of claims 1 to 4, characterized in that: The recess (21) is configured in an arc shape along the circumferential direction of the rotor core, and the magnetic steel (3) is configured as a magnetic tile and matches the shape of the recess (21).

6. The rotor assembly according to claim 5, characterized in that: The rotor assembly also includes an injection molded part, which is filled in the gap between the inner rotor core (2) and the outer rotor core (1) and between the magnetic steel (3) and the magnetic steel slot.

7. The rotor assembly according to claim 6, characterized in that: Along the axial direction of the rotor core, the injection molded part also covers the axial ends of the inner rotor core (2), the magnetic steel (3) and the outer rotor core (1).

8. The rotor assembly according to claim 7, characterized in that: The inner rotor core (2) and the outer rotor core (1) are both provided with a through hole which penetrates along the axial direction of the rotor core, and the injection molded parts are filled in the through hole.

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

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