Rotor assembly, motor and electric drive axle
By using a balance disc made of non-magnetic material combined with a fixing sleeve, along with a limiting structure and a coolant channel, the problems of magnetic leakage and loosening when the magnet distribution density of the motor is increased are solved, thus achieving efficient cooling and stable operation of the motor.
Patent Information
- Application Number
- CN202422826056.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In existing motors, when the distribution of magnets is increased closer to the inner diameter of the rotor to improve power density, the use of magnetically conductive materials for the balance disc leads to severe magnetic leakage loss. Furthermore, balance discs made of non-magnetically conductive materials are prone to loosening, affecting motor performance and lifespan.
The balance disc is made of non-magnetic material and connected to the shaft through a fixed sleeve. It is equipped with radial clearance and limiting structure, and is cooled by coolant channels to prevent magnetic leakage and loosening.
It effectively increases motor power density, reduces magnetic leakage loss, ensures the stability of the balance disc, extends motor life, and improves cooling efficiency.
Smart Images
Figure CN223599601U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor field, especially, relate to a rotor assembly, motor and electric drive bridge. BACKGROUND
[0002] With the continuous development of motor technology, the performance requirement of motor is also higher and higher, and the motor is also required to have high density, high reliability, high sustained output capacity and other characteristics.
[0003] The thermal performance of motor is the key factor affecting the performance of motor, when the motor operates, various losses such as iron loss (magnetic flux leakage), copper loss and mechanical loss are generated in the motor, and these losses are finally converted into heat, resulting in motor temperature rise. High temperature rise will seriously affect the power density, sustained performance output and service life of the motor. In order to improve the power density of the motor and solve the problem of temperature rise, the magnetic steel is arranged closer to the inner diameter of the rotor, at this time, if the balance disc is made of ordinary steel material, the performance loss caused by magnetic flux leakage will be increased. CONTENT OF THE UTILITY MODEL
[0004] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a rotor assembly, motor and electric drive bridge, which is used to solve the above-mentioned problems.
[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a rotor assembly, which comprises:
[0006] A rotating shaft;
[0007] A rotor core group comprising a plurality of rotor cores sleeved on the rotating shaft, wherein the rotor cores are provided with magnetic steel around the rotating shaft;
[0008] A balance disc provided outside the two ends of the rotor core group along the axial direction, wherein the balance disc is sleeved on the rotating shaft and has a radial gap between the balance disc and the rotating shaft, and the balance disc has an inner disc surface facing the rotor core group and an outer disc surface away from the rotor core group;
[0009] A fixing sleeve fixed on the rotating shaft and axially compressing the balance disc and the rotor core group through the outer disc surface.
[0010] Optionally, the balance disc is made of non-magnetic material, and a limiting structure for limiting the balance disc in the axial and radial directions is arranged between the fixing sleeve and the balance disc.
[0011] Optionally, the limiting structure comprises a groove provided on the outer disc surface, and the groove is arranged around the rotating shaft; a convex ring is arranged on the fixing sleeve and extends into the groove, and the convex ring cooperates with the groove to limit the balance disc in the axial and radial directions.
[0012] Optionally, a first rotation-stopping plane is arranged on the inner wall of the groove, a second rotation-stopping plane is arranged on the outer wall of the convex ring, and the first rotation-stopping plane and the second rotation-stopping plane cooperate to limit the relative rotation between the balance disc and the fixed sleeve.
[0013] Optionally, a cooling liquid channel is arranged on the shaft center in the axial direction, one end of the cooling liquid channel penetrates the end surface of the shaft, and a plurality of communication channels are arranged on the shaft corresponding to the balance disc, the communication channels are arranged in the radial direction of the shaft, and the communication channels are in communication with the radial gap.
[0014] Optionally, a liquid passing channel is arranged on the rotor core group in the axial direction, a plurality of flow guide grooves are arranged on the inner disc surface corresponding to the communication channels, one end of the flow guide grooves is in communication with the radial gap, and the other end of the flow guide grooves is connected to the inlet of the liquid passing channel.
[0015] Optionally, a liquid outlet through hole is arranged on the balance disc, the liquid outlet through hole is distributed in a staggered manner between the flow guide grooves, and the liquid outlet through hole is connected to the outlet of the liquid passing channel.
[0016] Optionally, the balance disc covers the magnetic steel on the rotor core, and the diameter of the balance disc is greater than the diameter of the fixed sleeve.
[0017] Optionally, the balance disc and the fixed sleeve are fixed as a whole.
[0018] To achieve the above-mentioned purpose and other related purposes, the utility model provides a motor, including stator assembly and rotor assembly.
[0019] To achieve the above-mentioned purpose and other related purposes, the utility model provides an electric drive bridge, including motor.
[0020] As described above, the rotor assembly, motor and electric drive bridge of the utility model have the following beneficial effects:
[0021] In the scheme, in order to improve the power density of the motor and increase the amount of magnetic steel on the rotor core, the distribution of the magnetic steel on the rotor core is closer to the shaft (i.e. the minimum diameter of the distribution circle of the magnetic steel is closer to the diameter of the shaft), at this time, if the balance disc adopts the magnetic conductive material used by the existing balance disc, performance loss caused by magnetic leakage will occur. In order to reduce magnetic leakage, the balance disc directly contacting the magnetic steel is made of non-magnetic conductive material. The balance disc made of non-magnetic conductive material is different from the material used by the shaft, so the thermal expansion coefficient is different. After the balance disc is directly installed on the shaft, loosening is prone to occur, therefore, the fixed sleeve is arranged. The fixed sleeve is directly connected with the shaft, and the balance disc is installed on the fixed sleeve, so that there is a radial gap between the balance disc and the shaft, avoiding loosening caused by the direct connection between the balance disc and the shaft. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a shaft view of the rotor assembly in the embodiment of the utility model.
[0023] Figure 2 is an internal schematic view of the rotor assembly in the embodiment of the utility model.
[0024] Figure 3 is a schematic view of the cooperation of the balance disc and the fixing sleeve in the embodiment of the utility model.
[0025] Figure 4 is another schematic view of the cooperation of the balance disc and the fixing sleeve in the embodiment of the utility model.
[0026] Figure 5 is a sectional view of A-A in the embodiment of the utility model. Figure 4
[0027] Figure 6 is a shaft view of the balance disc in the embodiment of the utility model.
[0028] Figure 7 is a shaft view of the fixing sleeve in the embodiment of the utility model. DETAILED DESCRIPTION
[0029] Reference signs in the drawings of the specification comprise:
[0030] the rotating shaft 1, the cooling liquid channel 101, the communication channel 102,
[0031] the balance disc 2, the inner disc surface 201, the outer disc surface 202, the flow guide groove 203, the recess 204, the liquid outlet through hole 205, the first rotation stopping plane 201,
[0032] the fixing sleeve 3, the convex ring 301, the second rotation stopping plane 302,
[0033] the rotor iron core group 4, the liquid communication channel 401.
[0034] The implementation manners of the utility model are explained by specific embodiments below, and other advantages and effects of the utility model can be easily understood by persons skilled in the art according to the content disclosed in the specification.
[0035] Reference is made to the accompanying drawings Figure 1 to the accompanying drawings Figure 7 As shown in the accompanying drawings, in an exemplary embodiment of the present application, a rotor assembly is provided, comprising:
[0036] the rotating shaft 1,
[0037] the rotor iron core group 4, comprising a plurality of rotor iron cores sleeved on the rotating shaft 1, and a magnetic steel arranged around the rotating shaft 1 in the rotor iron core;
[0038] The balance disc 2 is made of non-magnetic conductive material, arranged outside the rotor core group 4 along the axial direction, and has a radial gap between the balance disc 2 and the rotating shaft 1. The balance disc 2 has an inner disc surface 201 facing the rotor core group 4 and an outer disc surface 202 away from the rotor core group 4.
[0039] The fixed sleeve 3 is fixed on the rotating shaft 1 and axially presses the balance disc 2 and the rotor core group 4 through the outer disc surface 202.
[0040] For example, to ensure the consistency of the expansion coefficients between the fixed sleeve 3 and the rotating shaft 1, the fixed sleeve 3 and the rotating shaft 1 are made of the same material.
[0041] For example, the fixed sleeve 3 and the rotating shaft 1 are made of steel.
[0042] It is worth noting that in order to improve the power density of the motor and increase the amount of magnetic steel on the rotor core, the magnetic steel distribution on the rotor core will be closer to the rotating shaft 1 (i.e., the minimum diameter of the magnetic steel distribution circle will be closer to the diameter of the rotating shaft), at this time, if the balance disc 2 is made of magnetic conductive material, it will cause performance loss due to magnetic leakage. In order to reduce magnetic leakage, the balance disc 2 in direct contact with the magnetic steel is made of non-magnetic conductive material. Since the rotating shaft 1 is made of steel, the thermal expansion coefficients of the balance disc 2 and the rotating shaft 1 are different, and the balance disc 2 is directly installed on the rotating shaft 1, which is prone to loosening, so the fixed sleeve 3 is provided. The fixed sleeve 3 is directly connected to the rotating shaft 1, and the balance disc 2 is installed on the fixed sleeve 3, so that there is a radial gap between the balance disc 2 and the rotating shaft 1, avoiding the loosening caused by the direct connection between the balance disc 2 and the rotating shaft 1.
[0043] It is also worth noting that if the amount of magnetic steel is increased, the non-magnetic conductive balance disc 2 is not provided, and only the fixed sleeve 3 with magnetic conductive effect is provided. In order to reduce the performance loss caused by magnetic leakage, the fixed sleeve 3 cannot be in contact with the magnetic steel, at this time, the outer diameter of the fixed sleeve 3 needs to be smaller than the minimum diameter of the magnetic steel distribution circle on the rotor core, which is not conducive to the weight reduction setting on the fixed sleeve 3, and the balance disc 2 and the fixed sleeve 3 are provided, which will not be limited by the above, and the weight reduction is facilitated.
[0044] For example, the non-magnetic conductive material can be aluminum, copper, plastic, etc.
[0045] For example, the balance disc and the fixed sleeve are fixed as a whole, or they can be assembled by two parts.
[0046] In an example embodiment, a limiting structure is provided between the fixed sleeve 3 and the balance disc 2 for limiting the balance disc 2 in the axial and radial directions.
[0047] In the embodiment, the limiting structure is arranged to position the balance disc 2, and to limit the balance disc 2 in axial and radial directions.
[0048] For example, the limiting structure can be a concave-convex matching surface arranged between the fixing sleeve 3 and the balance disc 2, to limit the balance disc 2 in axial and radial directions.
[0049] In an example embodiment, the limiting structure includes a groove 204 arranged on the outer disc surface 202, and the groove 204 is arranged around the rotating shaft 1; the fixing sleeve 3 is provided with a convex ring 301 extending towards the groove 204, and the convex ring 301 matches the groove 204 to limit the balance disc 2 in axial and radial directions.
[0050] For example, the groove 204 is an L-shaped ring groove communicating with the radial gap, the fixing sleeve 3 is an L-shaped ring sleeve, and the convex ring 301 is a part of the ring sleeve.
[0051] In the embodiment, the groove 204 and the convex ring 301 are arranged to limit the balance disc 2 in axial and radial directions.
[0052] Referring to FIGS. 1 to 4, Figure 6 and FIGS. 5 to 8, Figure 7 in an example embodiment, an inner wall of the groove 204 is provided with a first rotation-stopping surface 201, an outer wall of the convex ring 301 is provided with a second rotation-stopping surface 302, and the first rotation-stopping surface 201 and the second rotation-stopping surface 302 match to limit the relative rotation between the balance disc 2 and the fixing sleeve 3.
[0053] In the embodiment, the first rotation-stopping surface 201 and the second rotation-stopping surface 302 are arranged to enable the balance disc 2 to rotate with the fixing sleeve 3 and the rotating shaft 1.
[0054] For example, the fixing sleeve 3 and the balance disc 2 can also match through a spline to limit the relative rotation.
[0055] In an example embodiment, a cooling liquid passage 101 is arranged in the rotating shaft 1 in an axial direction, one end of the cooling liquid passage 101 penetrates an end surface of the rotating shaft 1, and a plurality of communicating passages 102 are arranged on the rotating shaft 1 corresponding to the balance disc 2, the communicating passages 102 are arranged in a radial direction of the rotating shaft 1, and communicate with the radial gap.
[0056] For example, the cooling liquid passage 101 is cooled by passing cooling oil. The position where the cooling liquid passage 101 communicates with the end surface of the rotating shaft 1 is set as an oil inlet (the oil inlet position is shown in the right end of the rotating shaft in FIG. 4). Figure 2
[0057] In this embodiment, one end of the coolant channel 101 extends through the end of the rotating shaft 1, and the other end of the rotating shaft 1 is a sealed end. Cooling is achieved by providing the coolant channel 101 and the connecting channel 102 inside the rotating shaft 1.
[0058] For example, among the balance discs 2 at both ends of the rotor core assembly 4, the balance disc 2 near the oil inlet of the coolant channel 101 is called the first balance disc, and the other balance disc 2 is called the second balance disc. The connecting channels 102 are respectively provided for the first balance disc and the second balance disc, and multiple channels are provided for each of the first and second balance discs.
[0059] For example, the connecting channel 102 corresponding to each balance disc 2 is matched with the number of motor pole pairs P.
[0060] In an exemplary embodiment, a liquid passage 401 is provided through the rotor core assembly 4 along the axial direction, and multiple guide grooves 203 are provided on the inner disk surface 201 corresponding to the connecting channel 102. One end of the guide groove 203 is connected to the radial gap, and the other end of the guide groove 203 is connected to the inlet of the liquid passage.
[0061] It should be noted that the guide groove 203 is designed to connect the coolant channel 101 in the rotating shaft 1 and the liquid passage 401 in the rotor core assembly 4.
[0062] For example, the number of connecting channels 102 provided for each balance disc 2 is equal to the number of motor pole pairs P, and the number of guide grooves 203 on each balance disc 2 is half of the number of motor pole pairs P.
[0063] In an exemplary embodiment, the balance disc 2 is provided with a liquid outlet hole 205, which is staggered with the guide groove 203, and the liquid outlet hole 205 is connected to the outlet of the liquid passage 401.
[0064] Reference Appendix Figure 2 As shown, the coolant flows through the coolant channel 101, the connecting channel 102, the radial gap between the first balance disk and the rotating shaft 1, the guide groove 203 on the first balance disk, and the liquid passage 401, before exiting from the liquid outlet hole 205 on the second balance disk. Simultaneously, the coolant flows through the coolant channel 101, the connecting channel 102, the radial gap between the second balance disk and the rotating shaft 1, the guide groove 203 on the second balance disk, and the liquid passage 401, before exiting from the liquid outlet hole 205 on the first balance disk. This flow channel arrangement achieves cross-cooling and ensures that the first and second balance disks have identical structures, reducing the production cost of the balance disk 2. (The attached text is incomplete and requires further context.) Figure 2 The middle arrow points in the direction of coolant flow.
[0065] In an exemplary embodiment, the balance disc 2 covers the magnetic steel on the rotor core, and the diameter of the balance disc 2 is greater than the diameter of the fixing sleeve 3.
[0066] Exemplarily, the maximum outer diameter of the fixing sleeve is less than or equal to the minimum diameter of the magnetic steel distribution circumference, and the maximum outer diameter is close to the rotating shaft 1, so that the weight removal cannot be performed, and therefore, the balance disc 2 with a diameter greater than the fixing sleeve and capable of covering the magnetic steel is arranged to facilitate the weight removal.
[0067] In an exemplary embodiment of the present application, a motor, a stator assembly and the above rotor assembly are provided.
[0068] The rotor assembly in the present embodiment is applied to the motor, so that the product power density can be effectively improved, and the performance loss caused by the magnetic flux leakage can be effectively reduced.
[0069] In an exemplary embodiment of the present application, an electric drive bridge is provided, which comprises the above motor.
[0070] It should be noted that the above motor is applied to the electric drive bridge or vehicle, so that the product performance can be effectively improved.
[0071] The above embodiments only exemplarily illustrate the principle and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.
Claims
1. A rotor assembly characterized by, The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly.
2. The rotor assembly of claim 1, wherein The application relates to a motor rotor assembly.
3. The rotor assembly of claim 2, wherein, The application relates to a motor rotor assembly.
4. The rotor assembly of claim 3, wherein The application relates to a motor rotor assembly.
5. The rotor assembly of claim 1, wherein The application relates to a motor rotor assembly.
6. The rotor assembly of claim 5, wherein, The application relates to a motor rotor assembly.
7. The rotor assembly of claim 6, wherein The application relates to a motor rotor assembly.
8. The rotor assembly of any one of claims 1-7, wherein, The application relates to a motor rotor assembly.
9. The rotor assembly of claim 1, wherein The application relates to a motor rotor assembly.
10. An electric machine characterized by The application relates to a motor rotor assembly.
11. An electric drive axle, characterized in that The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a motor rotor assembly. The application relates to a