Rotor assembly and motor having it

Abstract

This invention provides a rotor assembly and a motor having the same. The rotor assembly includes a rotor core, which comprises a core yoke and a plurality of core magnetic poles spaced circumferentially along the core yoke. Each core magnetic pole forms a magnetic slot with the core yoke, and the outer side of the magnetic slot communicates with the outside of the rotor core. A first baffle and a second baffle are respectively assembled at both ends of the rotor core. Each core magnetic pole has an installation channel, and each fixing member passes through the installation channel, with both ends of each fixing member connected to the first baffle and the second baffle, respectively. According to this invention, by removing the magnetic isolation bridge between poles, and by using the fixing members passing through the installation channels on each core magnetic pole and connecting both ends of each fixing member to the two baffles, a reliable fixation of each core magnetic pole can be achieved, resulting in better overall structural strength of the rotor assembly and enabling it to withstand high-speed operation.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a rotor assembly and a motor having the same. Background Technology

[0002] A conventional rotor core of an existing embedded radial magnetic field motor, such as Figure 11 As shown, the magnets are embedded in the rotor core. To ensure the integrity of the rotor core, magnetic bridges are needed between the poles to maintain connection. This connection between poles can lead to magnetic leakage, affecting motor efficiency. Removing the magnetic bridges between poles can significantly reduce magnetic leakage and improve motor efficiency, but the connection between the magnetic poles and the yoke of the rotor core becomes weak, resulting in poor overall structural strength of the rotor core. When the motor speed reaches a certain point, this can cause severe deformation of the rotor core, or even breakage of the magnetic poles from the yoke. This can cause the magnets to fly out or the motor to smear, ultimately leading to motor burnout. Utility Model Content

[0003] Therefore, this utility model provides a rotor assembly that can solve the problem of removing the magnetic bridge between the poles of the rotor core. Although this can significantly reduce magnetic leakage and improve motor efficiency, the connection between each magnetic pole part and the yoke part of the rotor core is relatively weak, resulting in poor overall structural strength of the rotor core.

[0004] To address the aforementioned problems, this utility model provides a rotor assembly, including a rotor core, a first baffle, a second baffle, and multiple fixing members. The rotor core includes a core yoke and multiple core magnetic poles. Each core magnetic pole is distributed sequentially at intervals along the circumference of the core yoke. Each core magnetic pole forms a magnetic groove with the core yoke. The side of the magnetic groove facing the outer edge of the rotor core communicates with the outside of the rotor core. The first baffle and the second baffle are respectively assembled at both ends of the core yoke. Each core magnetic pole has an installation channel extending through the height of the core magnetic pole. Each fixing member passes through the installation channel, and both ends of each fixing member are connected to the first baffle and the second baffle, respectively.

[0005] In some embodiments, each of the iron core magnetic pole portions has two mounting channels, and each mounting channel is fitted with a fixing member.

[0006] In some embodiments, each of the core magnetic pole portions is separated from the core yoke portion, and two magnetic steel slots are formed between the core magnetic pole portions and the core yoke portion. An angle is formed between the two magnetic steel slots, and the two magnetic steel slots are connected on the side away from the outer edge of the rotor core. Magnets are inserted into both magnetic steel slots, and the two magnets do not contact each other.

[0007] In some embodiments, each of the fasteners is integrally formed on the first baffle; or each of the fasteners is integrally formed on the second baffle.

[0008] In some embodiments, when all the fixing members are integrally formed on the first baffle, the end of each fixing member away from the first baffle is snapped into connection with the second baffle; when all the fixing members are integrally formed on the second baffle, the end of each fixing member away from the second baffle is snapped into connection with the first baffle.

[0009] In some embodiments, along the circumference of the rotor core, both sides of each core magnetic pole are cut to form inter-pole tangents.

[0010] In some embodiments, the rotor assembly further includes a plurality of splicing components, each of which is assembled between two adjacent iron core magnetic pole portions, and each of the splicing components covers the inter-pole tangents of two adjacent iron cores. Along the circumference of the rotor iron core, each of the splicing components and each of the iron core magnetic pole portions are spliced ​​together to form a complete circle, and the two ends of each of the splicing components are respectively connected to the first baffle and the second baffle.

[0011] In some embodiments, each of the splicing components is integrally formed on the first baffle; or each of the splicing components is integrally formed on the second baffle.

[0012] In some embodiments, when all the splicing components are integrally formed on the first baffle, the end of each splicing component away from the first baffle is snapped into connection with the second baffle; when all the splicing components are integrally formed on the second baffle, the end of each splicing component away from the second baffle is snapped into connection with the first baffle.

[0013] This utility model also provides an electric motor, including the aforementioned rotor assembly.

[0014] The rotor assembly and the motor having the same provided by this utility model have the following beneficial effects:

[0015] By distributing the magnetic poles of each iron core sequentially and spaced apart along the circumference of the iron core yoke, and by connecting the magnetic grooves formed between the iron core poles and the iron core yoke to the outside of the rotor iron core on the side facing the outer edge of the rotor iron core, the magnetic isolation bridge between poles is essentially eliminated. This significantly reduces inter-pole magnetic leakage, improves motor output capacity, power density, and motor efficiency. Simultaneously, by utilizing the mounting channels through which each fixing component passes and connecting its ends to the first and second baffles, a secure fixation is achieved for each iron core pole, resulting in better overall structural strength of the rotor assembly and enabling it to withstand high-speed operation. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the rotor assembly after removing the second baffle according to an embodiment of the present invention;

[0018] Figure 2 This is an exploded view of the rotor core of the rotor assembly according to an embodiment of the present invention.

[0019] Figure 3 This is a front view of the rotor core of the rotor assembly according to an embodiment of the present invention;

[0020] Figure 4 This is a front view of the rotor assembly of this utility model, in which each magnet is inserted into each magnet slot of the rotor core.

[0021] Figure 5 This is a schematic diagram of the structure of the rotor assembly of the present invention, in which each fixing component and each splicing component are integrally formed on the first baffle.

[0022] Figure 6 This is a front view of the fixing components and splicing components integrally formed on the first baffle in an embodiment of the present utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the rotor assembly of the present invention, in which each fixing component and each splicing component are integrally formed on the first baffle.

[0024] Figure 8 This is a schematic diagram of the structure of the second baffle of the rotor assembly according to an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of the rotor assembly according to an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the magnetic circuit generated after the rotor assembly is assembled inside the stator according to an embodiment of the present invention.

[0027] Figure 11 A front view of a rotor assembly in the prior art where each magnet is inserted into a magnet slot in the rotor core.

[0028] The reference numerals in the attached figures are as follows:

[0029] 1. Rotor core; 11. Core yoke; 12. Core magnetic pole section; 2. First baffle; 3. Second baffle; 4. Magnet; 5. Fixing component; 6. Magnet slot; 7. Installation channel; 8. Magnetic isolation channel; 9. Inter-pole trimming edge; 10. Splicing component. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] See also Figures 1 to 11 As shown, according to an embodiment of the present invention, a rotor assembly is provided, including a rotor core 1, a first baffle 2, a second baffle 3, and a plurality of fixing members 5. The rotor core 1 includes a core yoke 11 and a plurality of core magnetic pole portions 12. Each core magnetic pole portion 12 is distributed sequentially at intervals along the circumference of the core yoke 11. Each core magnetic pole portion 12 forms a magnetic steel groove 6 between itself and the core yoke 11. The side of the magnetic steel groove 6 facing the outer edge of the rotor core 1 is connected to the outside of the rotor core 1. The first baffle 2 and the second baffle 3 are respectively assembled at both ends of the core yoke 11. Each core magnetic pole portion 12 is provided with an installation channel 7 that penetrates the height direction of the core magnetic pole portion 12. Each fixing member 5 passes through each installation channel 7, and both ends of each fixing member 5 are respectively connected to the first baffle 2 and the second baffle 3.

[0035] In this technical solution, by distributing the core magnetic pole portions 12 sequentially and spaced along the circumference of the core yoke portion 11, and by connecting the magnetic groove 6 formed between the core magnetic pole portions 12 and the core yoke portion 11 to the outside of the rotor core 1 on the side facing the outer edge of the rotor core 1, the magnetic isolation bridge between poles is essentially eliminated. This significantly reduces inter-pole magnetic leakage, improves motor output capacity, increases power density, and enhances motor efficiency. Simultaneously, by using the mounting channels 7 on each core magnetic pole portion 12 and connecting the two ends of each fixing member 5 to the first baffle 2 and the second baffle 3 respectively, a secure fixation of each core magnetic pole portion 12 is achieved, resulting in better overall structural strength of the rotor assembly and enabling it to withstand high-speed operation. The first baffle 2, the core yoke portion 11, and the second baffle 3 are all equipped with multiple rivet holes. Multiple rivets are driven into these holes to assemble the first baffle 2 and the second baffle 3 at both ends of the core yoke portion 11.

[0036] See also Figure 1 , Figure 3 and Figure 5 As shown, each iron core magnetic pole section 12 has two mounting channels 7, and each mounting channel 7 is fitted with a fixing member 5.

[0037] In this embodiment, each core magnetic pole portion 12 is fixed to the first baffle 2 and the second baffle 3 by two fixing members 5, making the fixing of each core magnetic pole portion 12 more secure.

[0038] See also Figures 2 to 4 As shown, each core magnetic pole portion 12 is separated from the core yoke portion 11. Two magnetic steel slots 6 are formed between the core magnetic pole portion 12 and the core yoke portion 11. An angle is formed between the two magnetic steel slots 6, and the side of the two magnetic steel slots 6 away from the outer edge of the rotor core 1 is connected. Magnets 4 are inserted into both magnetic steel slots 6, and the two magnets 4 do not contact each other.

[0039] In this technical solution, since each fixing component 5, together with the first baffle 2 and the second baffle 3, effectively fixes each iron core magnetic pole portion 12, in addition to removing the magnetic isolation bridge between poles, the separation of the iron core magnetic pole portion 12 and the iron core yoke portion 11, as well as the connection of the two magnetic steel slots 6 formed between them, also removes the magnetic isolation bridge that connects the magnetic pole and the yoke portion and forms a magnetic isolation effect on the two magnets 4. This further reduces magnetic leakage and improves motor efficiency. The first baffle 2, each fixing component 5, and the second baffle 3 can all be made of non-magnetic metal.

[0040] See also Figure 5 and Figure 7As shown, each fastener 5 is integrally formed on the first baffle 2; or each fastener 5 is integrally formed on the second baffle 3. This simplifies the process and makes assembly more convenient.

[0041] See also Figure 1 , Figure 5 , Figure 7 and Figure 9 As shown, when each fixing part 5 is integrally formed on the first baffle 2, the end of each fixing part 5 away from the first baffle 2 is snapped to the second baffle 3; when each fixing part 5 is integrally formed on the second baffle 3, the end of each fixing part 5 away from the second baffle 3 is snapped to the first baffle 2.

[0042] In this embodiment, after each fixing member 5 is integrally formed on one of the baffles, the other end of each fixing member 5 has a protrusion, and the other baffle has multiple locking holes. Each protrusion is respectively engaged in the locking holes to achieve a snap-fit ​​connection between each fixing member 5 and the other baffle. The snap-fit ​​connection makes the assembly method simple and convenient. It should be noted that the outer diameter of the first baffle 2 and the second baffle 3 is not greater than the outer diameter of the rotor core 1, and the inner diameter of the first baffle 2 and the second baffle 3 is greater than the inner diameter of the rotor core 1.

[0043] See also Figures 2 to 4 As shown, each iron core magnetic pole section 12 is constructed with a magnetically shielding channel 8 that runs through the height direction of the iron core magnetic pole section 12.

[0044] In this technical solution, by constructing magnetic isolation channels 8 on each iron core magnetic pole section 12, the motor torque pulsation can be reduced, thereby reducing motor vibration and noise.

[0045] See also Figures 2 to 4 As shown, along the circumference of the rotor core 1, both sides of the magnetic pole portion 12 of each core are cut to form inter-pole tangent edges 9. These inter-pole tangent edges 9 can be used to optimize the air gap magnetic flux density harmonics of the motor to reduce harmonics. For example... Figure 10 As shown, the interpole tangent 9 enables a complete magnetic circuit to be formed between the stator and rotor.

[0046] See also Figure 1 , Figure 5 , Figure 9 As shown, the rotor assembly also includes multiple splicing parts 10. Each splicing part 10 is assembled between two adjacent iron core magnetic pole parts 12, and each splicing part 10 covers the two adjacent inter-pole tangent edges 9. Along the circumference of the rotor iron core 1, each splicing part 10 and each iron core magnetic pole part 12 are spliced ​​to form a complete circle. The two ends of each splicing part 10 are respectively connected to the first baffle 2 and the second baffle 3.

[0047] In this embodiment, by using the first baffle 2 and the second baffle 3 to fix each splicing component 10, and splicing each splicing component 10 with each iron core magnetic pole portion 12 to form a complete circle, the gaps caused by the inter-pole cutting edge 9 can be filled, making the outer circle of the rotor iron core 1 complete. This reduces wind wear loss during operation, thereby improving motor efficiency and reducing rotational noise. The splicing component 10 can be made of non-magnetic metal. The formation of a complete circle by splicing each splicing component 10 with each iron core magnetic pole portion 12 means that each splicing component 10 and each iron core magnetic pole portion 12 form a cylindrical structure.

[0048] See also Figure 5 and Figure 7 As shown, each splicing component 10 is integrally formed on the first baffle 2; or each splicing component 10 is integrally formed on the second baffle 3. This simplifies the process and makes assembly more convenient.

[0049] See also Figure 1 , Figure 5 , Figure 7 and Figure 9 As shown, when each splicing component 10 is integrally formed on the first baffle 2, the end of each splicing component 10 away from the first baffle 2 is snapped into connection with the second baffle 3; when each splicing component 10 is integrally formed on the second baffle 3, the end of each splicing component 10 away from the second baffle 3 is snapped into connection with the first baffle 2.

[0050] In this embodiment, after each splicing component 10 is integrally formed on one of the baffles, the other end of each splicing component 10 has a protrusion, and the other baffle has multiple locking holes. Each protrusion is respectively engaged in the locking hole to realize the snap-fit ​​connection between each splicing component 10 and the other baffle. The snap-fit ​​connection makes the assembly method simple and convenient. The locking holes can be through holes or countersunk holes.

[0051] It should be noted that the assembly process of the rotor assembly is as follows: after the rotor core 1 is stamped, the core yoke 11 is first installed on the first baffle 2, then each core magnetic pole part 12 is installed, and each core magnetic pole part 12 is fixed by the fixing parts 5 on the first baffle 2. Then each magnet 4 is inserted, then the second baffle 3 is installed, and finally the baffles at both ends and the core yoke 11 are fixed by rivets to complete the assembly of the rotor assembly.

[0052] This utility model also provides an electric motor, including the aforementioned rotor assembly.

[0053] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0054] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above are only preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A rotor assembly, characterized in that, The rotor core (1) includes a rotor core (1), a first baffle (2), a second baffle (3), and multiple fixing components (5). The rotor core (1) includes a core yoke (11) and multiple core magnetic poles (12). Each core magnetic pole (12) is distributed sequentially and spaced apart along the circumference of the core yoke (11). Each core magnetic pole (12) forms a magnetic groove (6) with the core yoke (11). The magnetic groove (6) faces the outer edge of the rotor core (1). One side of the edge is connected to the outside of the rotor core (1). The first baffle (2) and the second baffle (3) are respectively assembled at both ends of the core yoke (11). Each core magnetic pole part (12) is provided with an installation channel (7) that runs through the height direction of the core magnetic pole part (12). Each fixing member (5) passes through each installation channel (7), and both ends of each fixing member (5) are respectively connected to the first baffle (2) and the second baffle (3).

2. The rotor assembly according to claim 1, characterized in that, Each of the iron core magnetic pole portions (12) has two mounting channels (7), and each mounting channel (7) is fitted with a fixing member (5).

3. The rotor assembly according to claim 1, characterized in that, Each of the core magnetic pole portions (12) is separated from the core yoke portion (11). Two magnetic steel slots (6) are formed between the core magnetic pole portions (12) and the core yoke portion (11). An angle is formed between the two magnetic steel slots (6), and the two magnetic steel slots (6) are connected on the side away from the outer edge of the rotor core (1). Magnets (4) are inserted into each of the two magnetic steel slots (6), and the two magnets (4) do not contact each other.

4. The rotor assembly according to claim 1, characterized in that, Each of the aforementioned fasteners (5) is integrally formed on the first baffle (2); or each of the aforementioned fasteners (5) is integrally formed on the second baffle (3).

5. The rotor assembly according to claim 4, characterized in that, When all the fixing parts (5) are integrally formed on the first baffle (2), the end of each fixing part (5) away from the first baffle (2) is snapped to the second baffle (3); when all the fixing parts (5) are integrally formed on the second baffle (3), the end of each fixing part (5) away from the second baffle (3) is snapped to the first baffle (2).

6. The rotor assembly according to any one of claims 1 to 5, characterized in that, Along the circumference of the rotor core (1), both sides of each core magnetic pole portion (12) are cut to form inter-pole tangents (9).

7. The rotor assembly according to claim 6, characterized in that, It also includes multiple splicing components (10), each splicing component (10) is assembled between two adjacent iron core magnetic pole parts (12), and each splicing component (10) covers the two adjacent inter-pole tangents (9). Along the circumference of the rotor iron core (1), each splicing component (10) and each iron core magnetic pole part (12) are spliced ​​to form a complete circle, and the two ends of each splicing component (10) are respectively connected to the first baffle (2) and the second baffle (3).

8. The rotor assembly according to claim 7, characterized in that, Each of the splicing components (10) is integrally formed on the first baffle (2); or each of the splicing components (10) is integrally formed on the second baffle (3).

9. The rotor assembly according to claim 8, characterized in that, When all the splicing parts (10) are integrally formed on the first baffle (2), the end of each splicing part (10) away from the first baffle (2) is snapped to the second baffle (3); when all the splicing parts (10) are integrally formed on the second baffle (3), the end of each splicing part (10) away from the second baffle (3) is snapped to the first baffle (2).

10. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 9.

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