A rotor structure of an outer rotor EC motor

Abstract

The utility model discloses a rotor structure of outer rotor EC motor, aims at providing a kind of rotor structure of outer rotor EC motor, which can not only improve magnetic tile assembly efficiency, reduce manufacturing cost;And can reduce magnetic loss, improve rotor magnetic circuit efficiency, to improve the rotor structure of a kind of outer rotor EC motor of motor efficiency. It includes rotor shell, the rotor core and several magnetic tiles of being fixed in rotor shell, the inside surface of the rotor core is equipped with several circumferential evenly distributed magnetic tile slots, the magnetic tile is installed in magnetic tile slot one to one, and magnetic tile and rotor core are fixedly connected by bonding.

Description

Technical Field

[0001] This utility model relates to the field of external rotor EC motor technology, specifically to a rotor structure for an external rotor EC motor. Background Technology

[0002] The rotor structure of current external rotor EC motors is relatively simple, but the magnetic tile fixing structure is relatively complex. Generally, it needs to be fixed by magnetic tile springs or magnetic tile frames. This not only makes the magnetic tile assembly operation inefficient and costly, but also the magnetic tile springs or magnetic tile frames, as magnetic isolation structures, will affect the rotor magnetic circuit efficiency, resulting in relatively high losses and affecting the efficiency of the external rotor EC motor.

[0003] On the other hand, the motor rotor housing is generally made of ordinary metal stretching material, which is difficult and requires high precision in processing. This makes the motor prone to vibration, increases component wear, and reduces the motor's service life.

[0004] For example, Chinese Patent Publication No. CN117639335A, entitled "Magnetic Tile Retainer, Rotor, External Rotor Motor and Compressor," describes a magnetic tile retainer that includes an elastic element pressed between two adjacent magnetic tiles. The elastic element comprises an elastic body, a first pressure strip, and a second pressure strip. The magnetic tiles of the external rotor motor in this application are fixed using a magnetic tile retainer, which also suffers from the aforementioned shortcomings. Utility Model Content

[0005] The primary objective of this invention is to provide a rotor structure for an external rotor EC motor that not only improves the assembly efficiency of magnetic tiles and reduces manufacturing costs, but also reduces magnetic loss, improves rotor magnetic circuit efficiency, and thus improves motor efficiency.

[0006] Another objective of this invention is to provide a rotor structure for an external rotor EC motor that can effectively solve the problem of motor vibration and shaking caused by uneven mass distribution after rotor assembly, thereby extending the service life of the motor.

[0007] The technical solution of this utility model is: A rotor structure for an external rotor EC motor includes a rotor housing, a rotor core fixed inside the rotor housing, and several magnetic tiles. The inner surface of the rotor core has several circumferentially evenly distributed magnetic tile slots. The magnetic tiles are installed one-to-one in the slots, and are bonded to the rotor core. This external rotor EC motor rotor structure directly creates magnetic tile slots on the rotor core within the rotor housing, installing the magnetic tiles one-to-one in the slots, and bonding them to the rotor core. This completes the magnetic tile assembly, which on the one hand facilitates assembly, prevents circumferential loosening, and improves assembly efficiency; on the other hand, it eliminates the need for magnetic tile springs or frames, reducing manufacturing costs. By eliminating magnetic isolation structures like springs or frames, and using the rotor core as a magnetic conductor, magnetic losses are reduced, rotor magnetic circuit efficiency is improved, and overall motor efficiency is increased.

[0008] Preferably, the magnetic tile groove is a dovetail groove, and the cross-section of the magnetic tile is adapted to the magnetic tile groove. In this way, the installation stability of the magnetic tile can be improved by the cooperation of the dovetail groove with the magnetic tile, and the magnetic tile can be prevented from loosening in the circumferential direction.

[0009] Preferably, the magnetic tile slots extend through both ends of the rotor core along the rotor housing axially. This facilitates the fabrication of the magnetic tile slots and the assembly of the magnetic tiles.

[0010] Preferably, the system also includes an annular dynamic balancing pre-fitting component. This component is located at the center of the outer surface of the rotor housing and is coaxially distributed with the housing. The annular dynamic balancing pre-fitting component has several rotor dynamic balancing pre-fitting holes. After the rotor is assembled, uneven mass distribution may occur, leading to motor vibration and shaking. To address this issue, this solution includes an annular dynamic balancing pre-fitting component at the center of the outer surface of the rotor housing, with rotor dynamic balancing pre-fitting holes on it. This allows for machining and drilling into these holes, enabling adjustment of the rotor's dynamic balance without affecting the overall rotor structure, thus ensuring smooth rotor operation. This effectively solves the motor vibration and shaking problem caused by uneven mass distribution after rotor assembly, extending the motor's service life.

[0011] Preferably, the annular dynamic balancing pre-fit component is composed of an annular dynamic balancing pre-fit plate, which is integrally formed with the rotor housing. The axis of the annular dynamic balancing pre-fit plate is perpendicular to that of the rotor housing. Both end faces of the annular dynamic balancing pre-fit plate are provided with the aforementioned rotor dynamic balancing pre-fit holes, and the rotor dynamic balancing pre-fit holes on each end face of the annular dynamic balancing pre-fit plate are evenly distributed around the circumference of the rotor housing. This facilitates the actual processing and manufacturing of the annular dynamic balancing pre-fit component, as well as the setting of the rotor dynamic balancing pre-fit holes and subsequent machining drilling, thereby adjusting the dynamic balance of the rotor structure.

[0012] Preferably, the annular dynamic balancing pre-fit component is composed of an annular dynamic balancing pre-fit plate, and the annular dynamic balancing pre-fit plate and the rotor housing are integrally formed. The annular dynamic balancing pre-fit plate is provided with a number of circumferentially evenly distributed mounting through holes.

[0013] Preferably, the rotor also includes a rotor mandrel. The rotor housing includes a cylindrical shell and an end cap located at one end of the cylindrical shell. One end of the rotor mandrel is fixed to the middle of the end cap, and the rotor mandrel is coaxially distributed with the cylindrical shell. The inner surface of the end cap is provided with several runout adjustment ribs evenly distributed around the rotor mandrel circumferentially. The runout adjustment ribs in this design are different from the reinforcing ribs of other materials and functional designs. These runout adjustment ribs can adjust the runout of the entire rotor in the circumferential direction. Specifically, during the circumferential runout detection process after the rotor structure is assembled, if the rotor has circumferential runout, the runout adjustment ribs corresponding to the location of large runout can be tapped along the axial direction of the rotor mandrel with a metal rod after detection. In this way, without affecting the rotor structure (the slight deformation caused by the metal rod tapping the runout adjustment ribs along the axial direction of the rotor mandrel only occurs at the runout adjustment ribs), the circumferential runout of the rotor can be effectively reduced, thereby extending the service life of the motor.

[0014] Preferably, the device also includes a mandrel nest, which is embedded in the middle of the end cover and coaxially distributed with the cylindrical housing. One end of the rotor mandrel is embedded in the mandrel nest. This facilitates the installation of the rotor mandrel.

[0015] Preferably, the end cover has a retaining cylinder extending into the rotor housing at its center, and the mandrel is nested and embedded in the retaining cylinder. The runout adjustment rib connects the retaining cylinder and the inner side of the end cover. In this way, the runout adjustment rib can also improve the structural strength and stability of the retaining cylinder, thereby improving the structural stability of the mandrel nesting and thus improving the installation stability of the rotor mandrel.

[0016] Preferably, the rotor housing is made of die-cast aluminum, with the cylindrical housing, end caps, and various runout adjustment ribs forming a single die-cast structure. This facilitates the machining and manufacturing of the rotor housing.

[0017] The beneficial effects of this utility model are: Firstly, it facilitates the assembly of magnetic tiles, prevents them from loosening in the circumferential direction, and improves the assembly efficiency. Secondly, it eliminates the need for magnetic tile springs or frames to fix the magnetic tiles, thereby reducing manufacturing costs. By eliminating magnetic isolation structures such as magnetic tile springs or frames, and using the rotor core as a magnetic conductor, it can reduce magnetic loss, improve rotor magnetic circuit efficiency, and increase motor efficiency.

[0018] Secondly, it can adjust the dynamic balance of the rotor structure without affecting the rotor structure, so that the rotor structure runs smoothly; thus effectively solving the problem of motor vibration and shaking caused by uneven mass distribution after rotor assembly, and extending the service life of the motor.

[0019] Thirdly, during the circumferential runout detection process after rotor assembly, if circumferential runout exists in the rotor, the runout adjustment ribs corresponding to the large runout locations can be tapped along the axial direction of the rotor spindle using a metal rod, which can effectively reduce circumferential runout and extend the motor's service life. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the rotor structure of an external rotor EC motor according to this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of the rotor structure of an external rotor EC motor according to this utility model.

[0022] Figure 3 This is a top view of this utility model.

[0023] In the picture: Rotor housing 1, cylindrical housing 1.1, end cap 1.2; Rotor core 2, magnetic tile slot 2.1; Magnetic tile 3; Rotor mandrel 4; 5 pre-assembled ring-shaped dynamic balancing components; Rotor dynamic balancing pre-fitting hole 6; Adjust the convex rib 7 by adjusting its movement; The mandrel is nested at 8, and the annular protrusion is 8.1. Detailed Implementation

[0024] Specific Implementation Example 1, such as Figure 1 , Figure 2 , Figure 3 As shown, a rotor structure of an external rotor EC motor includes a rotor housing 1, a rotor core 2 fixed inside the rotor housing 1, and several magnetic tiles 3.

[0025] The inner surface of the rotor core 2 is provided with several circumferentially evenly distributed magnetic tile grooves 2.1. The magnetic tile grooves 2.1 extend circumferentially along the rotor core 2. Magnetic tiles 3 are installed one-to-one in the magnetic tile grooves 2.1, that is, the magnetic tiles 3 and magnetic tile grooves 2.1 are installed in the corresponding magnetic tile grooves 2.1. The magnetic tiles 3 and the rotor core 2 are fixedly connected by adhesive, that is, the magnetic tiles 3 and the rotor core 2 are directly bonded and fixedly connected by adhesive.

[0026] In this embodiment, the rotor structure of an external rotor EC motor features a magnetic tile slot 2.1 directly formed on the rotor core 2 of the rotor housing 1. Magnetic tiles 3 are installed one-to-one within the slots, and the magnetic tiles 3 are bonded to the rotor core 2, thus completing the assembly of the magnetic tiles 3. This facilitates the assembly of the magnetic tiles 3, prevents them from loosening in the circumferential direction, and improves assembly efficiency. Furthermore, it eliminates the need for magnetic tile 3 springs or frames to fix the magnetic tiles 3, thereby reducing manufacturing costs. By eliminating magnetic isolation structures such as magnetic tile 3 springs or frames, and since the rotor core 2 is a magnetic conductor, magnetic losses are reduced, rotor magnetic circuit efficiency is improved, and motor efficiency is increased.

[0027] Specifically, such as Figure 1 , Figure 2 , Figure 3 As shown, a rotor structure for an external rotor EC motor further includes a rotor spindle 4. The rotor housing 1 includes a cylindrical shell 1.1 and an end cap 1.2 located at one end of the cylindrical shell 1.1. In this embodiment, the rotor housing 1 is an aluminum die-casting part, and the cylindrical shell 1.1 and the end cap 1.2 are integrally die-cast structures. This facilitates the processing and manufacturing of the rotor housing 1.

[0028] One end of the rotor spindle 4 is fixed to the middle of the end cover 1.2, and the rotor spindle 4 is coaxially distributed with the cylindrical shell 1.1.

[0029] The rotor core 2 is embedded in the cylindrical shell 1.1. In this embodiment, the rotor core 2 is embedded in the cylindrical shell 1.1 by cold pressing forming process.

[0030] Furthermore, such as Figure 2 As shown, a rotor structure for an external rotor EC motor further includes a spindle nest 8. The spindle nest 8 is embedded in the middle of the end cover 1.2. The spindle nest 8 is coaxially distributed with the cylindrical housing 1.1, and one end of the rotor spindle 4 is embedded in the spindle nest 8. This facilitates the installation of the rotor spindle 4.

[0031] In this embodiment, one end of the rotor spindle 4 is embedded in the spindle nest 8 using a cold pressing forming process.

[0032] Furthermore, such as Figure 3 As shown, the magnetic tile groove 2.1 is a dovetail groove, and the cross-section of the magnetic tile 3 is adapted to the magnetic tile groove 2.1. In this way, the installation stability of the magnetic tile 3 can be improved by the cooperation between the dovetail groove and the magnetic tile 3, and the magnetic tile 3 can be prevented from loosening in the circumferential direction.

[0033] It should be noted that the magnetic tile groove 2.1 can also be a square groove.

[0034] Furthermore, the magnetic tile groove 2.1 extends axially through both ends of the rotor core 2 along the rotor housing 1. This facilitates the fabrication of the magnetic tile groove 2.1 and the assembly of the magnetic tile 3.

[0035] Specific embodiment two, such as Figure 1 , Figure 2 , Figure 3 As shown, a rotor structure of an external rotor EC motor includes a rotor housing 1, a rotor core 2 fixed inside the rotor housing 1, several magnetic tiles 3, and an annular dynamic balancing pre-assembly component 5.

[0036] The inner surface of the rotor core 2 is provided with several circumferentially evenly distributed magnetic tile grooves 2.1. The magnetic tile grooves 2.1 extend circumferentially along the rotor core 2. Magnetic tiles 3 are installed one-to-one in the magnetic tile grooves 2.1, that is, the magnetic tiles 3 and magnetic tile grooves 2.1 are installed in the corresponding magnetic tile grooves 2.1. The magnetic tiles 3 and the rotor core 2 are fixedly connected by adhesive, that is, the magnetic tiles 3 and the rotor core 2 are directly bonded and fixedly connected by adhesive.

[0037] An annular dynamic balancing pre-fitting component 5 is located at the center of the outer side of the rotor housing 1, and is coaxially distributed with the rotor housing 1. The annular dynamic balancing pre-fitting component 5 has several rotor dynamic balancing pre-fitting holes 6. These rotor dynamic balancing pre-fitting holes 6 are blind holes.

[0038] In this embodiment, the rotor structure of an external rotor EC motor features a magnetic tile slot 2.1 directly formed on the rotor core 2 of the rotor housing 1. Magnetic tiles 3 are installed one-to-one within the slots, and the magnetic tiles 3 are bonded to the rotor core 2, thus completing the assembly of the magnetic tiles 3. This facilitates the assembly of the magnetic tiles 3, prevents them from loosening in the circumferential direction, and improves assembly efficiency. Furthermore, it eliminates the need for magnetic tile 3 springs or frames to fix the magnetic tiles 3, thereby reducing manufacturing costs. By eliminating magnetic isolation structures such as magnetic tile 3 springs or frames, and since the rotor core 2 is a magnetic conductor, magnetic losses are reduced, rotor magnetic circuit efficiency is improved, and motor efficiency is increased.

[0039] Furthermore, after the rotor is assembled, uneven mass distribution may occur, leading to motor vibration and shaking. To address this issue, this solution includes an annular dynamic balancing pre-fitting component 5 located in the center of the outer surface of the rotor housing 1. A rotor dynamic balancing pre-fitting hole 6 is provided on the annular dynamic balancing pre-fitting component 5. This allows for the adjustment of the rotor's dynamic balance without affecting its structure by machining holes in the rotor dynamic balancing pre-fitting hole 6, ensuring smooth rotor operation. This effectively solves the motor vibration and shaking problem caused by uneven mass distribution after rotor assembly, extending the motor's service life, especially for large external rotor motors.

[0040] Specifically, such as Figure 1 , Figure 2 , Figure 3 As shown, a rotor structure for an external rotor EC motor further includes a rotor spindle 4. The rotor housing 1 includes a cylindrical shell 1.1 and an end cap 1.2 located at one end of the cylindrical shell 1.1. In this embodiment, the rotor housing 1 is an aluminum die-casting part, and the cylindrical shell 1.1 and the end cap 1.2 are integrally die-cast structures. This facilitates the processing and manufacturing of the rotor housing 1.

[0041] One end of the rotor spindle 4 is fixed to the middle of the end cover 1.2, and the rotor spindle 4 is coaxially distributed with the cylindrical shell 1.1.

[0042] The rotor core 2 is embedded in the cylindrical shell 1.1. In this embodiment, the rotor core 2 is embedded in the cylindrical shell 1.1 by cold pressing forming process.

[0043] Furthermore, such as Figure 2 As shown, a rotor structure for an external rotor EC motor further includes a spindle nest 8. The spindle nest 8 is embedded in the middle of the end cover 1.2. The spindle nest 8 is coaxially distributed with the cylindrical housing 1.1, and one end of the rotor spindle 4 is embedded in the spindle nest 8. This facilitates the installation of the rotor spindle 4.

[0044] In this embodiment, one end of the rotor spindle 4 is embedded in the spindle nest 8 using a cold pressing forming process.

[0045] Furthermore, such as Figure 3 As shown, the magnetic tile groove 2.1 is a dovetail groove, and the cross-section of the magnetic tile 3 is adapted to the magnetic tile groove 2.1. In this way, the installation stability of the magnetic tile 3 can be improved by the cooperation between the dovetail groove and the magnetic tile 3, and the magnetic tile 3 can be prevented from loosening in the circumferential direction.

[0046] It should be noted that the magnetic tile groove 2.1 can also be a square groove.

[0047] Furthermore, the magnetic tile groove 2.1 extends axially through both ends of the rotor core 2 along the rotor housing 1. This facilitates the fabrication of the magnetic tile groove 2.1 and the assembly of the magnetic tile 3.

[0048] Furthermore, such as Figure 1 , Figure 2 , Figure 3As shown, the annular dynamic balancing pre-fit component 5 is composed of an annular dynamic balancing pre-fit plate, which is integrally formed with the rotor housing 1. The annular dynamic balancing pre-fit plate is perpendicular to the axis of the rotor housing 1. Both ends of the annular dynamic balancing pre-fit plate are provided with the aforementioned rotor dynamic balancing pre-fit holes 6, and the rotor dynamic balancing pre-fit holes 6 on each end face of the annular dynamic balancing pre-fit plate are evenly distributed around the circumference of the rotor housing 1. This facilitates the actual processing and manufacturing of the annular dynamic balancing pre-fit component 5, as well as the setting of the rotor dynamic balancing pre-fit holes 6 and subsequent machining drilling, to adjust the dynamic balance of the rotor structure.

[0049] In this embodiment, the annular dynamic balance pre-fit plate is located in the middle of the outer side of the cylindrical shell 1.1.

[0050] The annular dynamic balancing pre-fit plate has several circumferentially evenly distributed mounting through holes.

[0051] Specific embodiment three, such as Figure 1 , Figure 2 , Figure 3 As shown, a rotor structure of an external rotor EC motor includes a rotor housing 1, a rotor spindle 4, a rotor core 2 fixed inside the rotor housing 1, several magnetic tiles 3, and an annular dynamic balancing pre-assembly component 5.

[0052] The rotor housing 1 includes a cylindrical shell 1.1 and an end cap 1.2 located at one end of the cylindrical shell 1.1. In this embodiment, the rotor housing 1 is an aluminum die-casting part, and the cylindrical shell 1.1 and the end cap 1.2 are integrally die-cast structures. One end of the rotor spindle 4 is fixed to the middle of the end cap 1.2, and the rotor spindle 4 is coaxially distributed with the cylindrical shell 1.1.

[0053] The rotor core 2 is embedded in the cylindrical shell 1.1. In this embodiment, the rotor core 2 is embedded in the cylindrical shell 1.1 by cold pressing forming process.

[0054] The inner side of the end cover 1.2 is provided with several jumping adjustment ribs 7 evenly distributed around the rotor spindle 4.

[0055] The inner surface of the rotor core 2 is provided with several circumferentially evenly distributed magnetic tile grooves 2.1. The magnetic tile grooves 2.1 extend circumferentially along the rotor core 2. Magnetic tiles 3 are installed one-to-one in the magnetic tile grooves 2.1, that is, the magnetic tiles 3 and magnetic tile grooves 2.1 are installed in the corresponding magnetic tile grooves 2.1. The magnetic tiles 3 and the rotor core 2 are fixedly connected by adhesive, that is, the magnetic tiles 3 and the rotor core 2 are directly bonded and fixedly connected by adhesive.

[0056] An annular dynamic balancing pre-fitting component 5 is located at the center of the outer side of the rotor housing 1, and is coaxially distributed with the rotor housing 1. The annular dynamic balancing pre-fitting component 5 has several rotor dynamic balancing pre-fitting holes 6. These rotor dynamic balancing pre-fitting holes 6 are blind holes.

[0057] In this embodiment, the annular dynamic balancing pre-fitting component 5 is located in the middle of the outer side of the cylindrical shell 1.1.

[0058] In this embodiment, the rotor structure of an external rotor EC motor features a magnetic tile slot 2.1 directly formed on the rotor core 2 of the rotor housing 1. Magnetic tiles 3 are installed one-to-one within the slots, and the magnetic tiles 3 are bonded to the rotor core 2, thus completing the assembly of the magnetic tiles 3. This facilitates the assembly of the magnetic tiles 3, prevents them from loosening in the circumferential direction, and improves assembly efficiency. Furthermore, it eliminates the need for magnetic tile 3 springs or frames to fix the magnetic tiles 3, thereby reducing manufacturing costs. By eliminating magnetic isolation structures such as magnetic tile 3 springs or frames, and since the rotor core 2 is a magnetic conductor, magnetic losses are reduced, rotor magnetic circuit efficiency is improved, and motor efficiency is increased.

[0059] After the rotor is assembled, uneven mass distribution may occur, leading to motor vibration and shaking. To address this issue, this solution includes an annular dynamic balancing pre-fitting component 5 located in the center of the outer surface of the rotor housing 1. A rotor dynamic balancing pre-fitting hole 6 is provided on the annular dynamic balancing pre-fitting component 5. This allows for the adjustment of the rotor's dynamic balance without affecting the rotor structure itself, ensuring smooth rotor operation. This effectively solves the motor vibration and shaking problem caused by uneven mass distribution after rotor assembly, extending the motor's service life, especially for large external rotor motors.

[0060] Furthermore, the runout adjustment rib 7 in this embodiment differs from other reinforcing ribs in terms of materials and functional design. This runout adjustment rib 7 can adjust the runout of the entire rotor in the circumferential direction. Specifically, during the circumferential runout detection process after rotor structure assembly, if the rotor exhibits circumferential runout, the runout adjustment rib 7 corresponding to the location of the largest runout can be tapped along the axial direction of the rotor spindle 4 using a metal rod. In this way, without affecting the rotor structure (the slight deformation caused by the metal rod tapping the runout adjustment rib 7 along the axial direction of the rotor spindle 4 only occurs at the runout adjustment rib 7), the circumferential runout of the rotor can be effectively reduced, thereby extending the service life of the motor; especially for the runout problem of large external rotor motors.

[0061] Furthermore, such as Figure 1 , Figure 2 , Figure 3As shown, a rotor structure for an external rotor EC motor further includes a spindle nest 8. The spindle nest 8 is embedded in the middle of the end cover 1.2. The spindle nest 8 is coaxially distributed with the cylindrical housing 1.1, and one end of the rotor spindle 4 is embedded in the spindle nest 8. This facilitates the installation of the rotor spindle 4.

[0062] In this embodiment, one end of the rotor spindle 4 is embedded in the spindle nest 8 using a cold pressing forming process.

[0063] Furthermore, such as Figure 3 As shown, the magnetic tile groove 2.1 is a dovetail groove, and the cross-section of the magnetic tile 3 is adapted to the magnetic tile groove 2.1. In this way, the installation stability of the magnetic tile 3 can be improved by the cooperation between the dovetail groove and the magnetic tile 3, and the magnetic tile 3 can be prevented from loosening in the circumferential direction.

[0064] It should be noted that the magnetic tile groove 2.1 can also be a square groove.

[0065] Furthermore, the magnetic tile groove 2.1 extends axially through both ends of the rotor core 2 along the rotor housing 1. This facilitates the fabrication of the magnetic tile groove 2.1 and the assembly of the magnetic tile 3.

[0066] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the annular dynamic balancing pre-fit component 5 is composed of an annular dynamic balancing pre-fit plate, which is integrally formed with the rotor housing 1. The annular dynamic balancing pre-fit plate is perpendicular to the axis of the rotor housing 1. Both ends of the annular dynamic balancing pre-fit plate are provided with the aforementioned rotor dynamic balancing pre-fit holes 6, and the rotor dynamic balancing pre-fit holes 6 on each end face of the annular dynamic balancing pre-fit plate are evenly distributed around the circumference of the rotor housing 1. This facilitates the actual processing and manufacturing of the annular dynamic balancing pre-fit component 5, as well as the setting of the rotor dynamic balancing pre-fit holes 6 and subsequent machining drilling, to adjust the dynamic balance of the rotor structure.

[0067] The annular dynamic balancing pre-fit plate has several circumferentially evenly distributed mounting through holes.

[0068] Furthermore, the end cover 1.2 has a retaining cylinder extending into the rotor housing 1 at its center, and the spindle nest 8 is embedded in the retaining cylinder. A runout adjustment rib 7 connects the retaining cylinder and the inner surface of the end cover 1.2. Thus, the runout adjustment rib 7 can also improve the structural strength and stability of the retaining cylinder, thereby improving the structural stability of the spindle nest 8 and ultimately enhancing the installation stability of the rotor spindle 4.

[0069] In this embodiment, the outer side of the mandrel nest 8 is provided with an annular protrusion 8.1, which is embedded in the retaining cylinder.

[0070] Furthermore, the cylindrical shell 1.1, end cap 1.2, and each runout adjustment rib 7 are integrally die-cast. This facilitates the machining and manufacturing of the rotor shell 1.

[0071] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A rotor structure for an external rotor EC motor, characterized in that, It includes a rotor housing, a rotor core fixed inside the rotor housing, and several magnetic tiles. The inner side of the rotor core is provided with several circumferentially evenly distributed magnetic tile grooves. The magnetic tiles are installed in the magnetic tile grooves one by one, and the magnetic tiles are fixedly connected to the rotor core by bonding.

2. The rotor structure of an external rotor EC motor according to claim 1, characterized in that, The magnetic tile groove is a dovetail groove, and the cross-section of the magnetic tile is adapted to the magnetic tile groove.

3. The rotor structure of an external rotor EC motor according to claim 1 or 2, characterized in that, The magnetic tile groove extends axially through both ends of the rotor core along the rotor housing.

4. The rotor structure of an external rotor EC motor according to claim 1 or 2, characterized in that, It also includes an annular dynamic balancing pre-fitting component, which is located in the middle of the outer side of the rotor housing and is coaxially distributed with the rotor housing. The annular dynamic balancing pre-fitting component is provided with several rotor dynamic balancing pre-fitting holes.

5. The rotor structure of an external rotor EC motor according to claim 4, characterized in that, The annular dynamic balancing pre-fitting component is composed of an annular dynamic balancing pre-fitting plate, and the annular dynamic balancing pre-fitting plate and the rotor housing are integrally formed. The axis of the annular dynamic balancing pre-fitting plate is perpendicular to that of the rotor housing. Both ends of the annular dynamic balancing pre-fitting plate are provided with the aforementioned rotor dynamic balancing pre-fitting holes, and each rotor dynamic balancing pre-fitting hole on each end face of the annular dynamic balancing pre-fitting plate is evenly distributed around the circumference of the rotor housing.

6. The rotor structure of an external rotor EC motor according to claim 4, characterized in that, The annular dynamic balancing pre-fitting component is composed of an annular dynamic balancing pre-fitting plate, and the annular dynamic balancing pre-fitting plate and the rotor housing are integrally formed. The annular dynamic balancing pre-fitting plate is provided with a number of circumferentially evenly distributed mounting through holes.

7. The rotor structure of an external rotor EC motor according to claim 1 or 2, characterized in that, It also includes a rotor spindle, and the rotor housing includes a cylindrical shell and an end cap located at one end of the cylindrical shell. One end of the rotor spindle is fixed to the middle of the end cap, and the rotor spindle and the cylindrical shell are coaxially distributed. The inner side of the end cap is provided with a plurality of jumping adjustment ribs evenly distributed around the rotor spindle.

8. The rotor structure of an external rotor EC motor according to claim 7, characterized in that, It also includes a spindle nest, which is embedded in the middle of the end cover. The spindle nest is coaxially distributed with the cylindrical shell, and one end of the rotor spindle is embedded in the spindle nest.

9. The rotor structure of an external rotor EC motor according to claim 8, characterized in that, The end cover has a retaining cylinder extending into the rotor housing in the middle, and the spindle is nested in the retaining cylinder. The jumping adjustment rib is connected between the retaining cylinder and the inner side of the end cover.

10. The rotor structure of an external rotor EC motor according to claim 7, characterized in that, The rotor housing is made of die-cast aluminum, and the cylindrical housing, end caps and various runout adjustment ribs are integrally die-cast structures.

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