Rotor assembly, motor and compressor
By designing a connected structure of inclined heat dissipation holes and ventilation holes in the rotor assembly, and combining it with the airflow introduced by the air guide, the problem of the magnet's heat being difficult to dissipate was solved, achieving the effect of reducing the magnet's temperature and ensuring stable motor operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHUHAI LANDA COMPRESSOR
- Filing Date
- 2025-12-29
- Publication Date
- 2026-05-01
AI Technical Summary
The heat generated by the magnets of the permanent magnet motor of the existing compressor is difficult to dissipate effectively due to eddy currents and hysteresis effects, which leads to the risk of demagnetization and affects the stable operation of the motor under high load conditions.
The rotor assembly is designed with heat dissipation holes that penetrate the magnet and ventilation holes on the baffle to connect them. The heat dissipation holes are tilted in the same direction as the rotation, and airflow is introduced in conjunction with the air guide to enhance the heat dissipation effect.
It effectively removes the heat generated by eddy currents and hysteresis effects in the magnets, reduces the magnet temperature, lowers the risk of demagnetization, and ensures stable operation of the motor under high load conditions.
Smart Images
Figure CN121966086A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of motor technology, specifically relating to a rotor assembly, a motor, and a compressor. Background Technology
[0002] In the field of permanent magnet motors for compressors, the rotor assembly is one of the core components of the motor. Its magnets are typically made of neodymium iron boron (NdFeB), which possesses high energy product and excellent magnetic properties. However, during high-speed motor operation, the magnets generate a large amount of heat due to eddy currents and hysteresis effects, leading to increased magnet temperature and a risk of demagnetization, which in turn affects the motor's performance and reliability. Current technologies lack effective heat dissipation structures for the magnets, making it difficult to dissipate heat in a timely manner and affecting the stable operation of the motor under high-load conditions. Summary of the Invention
[0003] Therefore, the present invention provides a rotor assembly that can solve the technical problem that the lack of effective heat dissipation structure design for magnets used in motors makes it difficult to dissipate heat in a timely manner, thus affecting the stable operation of the motor under high load conditions.
[0004] To address the aforementioned problems, the present invention provides a rotor assembly comprising a rotor core, magnets, and a baffle. The rotor core has a receiving groove extending through its axial direction, and the magnets are inserted into the receiving groove. The magnets also have heat dissipation holes extending through their length. The baffle is mounted on one end of the rotor core and has ventilation holes that communicate with the heat dissipation holes.
[0005] In some embodiments, the heat dissipation hole is inclined relative to the axial direction of the rotor core, and the inclination direction of the heat dissipation hole is the same as the rotation direction of the rotor assembly in the rotating state.
[0006] In some embodiments, the included angle between the heat dissipation hole and the axial direction of the rotor core is A, where 0° < A < 60°.
[0007] In some embodiments, the heat dissipation hole includes a base section and an enlarged section, the enlarged section and the base section are connected, and the cross-sectional area of the enlarged section is larger than the cross-sectional area of the base section.
[0008] In some embodiments, a guide body is formed on the side of the baffle facing away from the rotor core, and when the rotor assembly is rotating, the guide body can guide the airflow driven by the rotor assembly into the ventilation hole.
[0009] In some embodiments, the air guide blocks one side of the ventilation hole, while the other side of the ventilation hole is exposed. When the rotor assembly is rotating, the exposed side of the ventilation hole faces the direction of the incoming airflow.
[0010] In some embodiments, the air guide is inclined relative to the baffle, and the air guide is inclined toward the side where the ventilation hole is exposed.
[0011] In some embodiments, the included angle between the air guide and the baffle is B, where 30° < B < 60°.
[0012] In some embodiments, the radius of the ventilation hole is r, and the height of the air guide is H, where r < H < 5r.
[0013] In some embodiments, the air guide has an inner arc surface facing the incoming direction of the airflow, the inner arc surface has an inner arc line that connects with the baffle, the inner arc line surrounds the periphery of the ventilation hole, the radius of the ventilation hole is r, and the arc length of the inner arc line is L, where 0.5πr < L < 2πr.
[0014] In some embodiments, the rotor core has a plurality of accommodating slots extending along its axial direction, the accommodating slots being spaced apart circumferentially along the rotor core, each accommodating slot containing a magnet, each magnet having a heat dissipation hole extending through its length, and the baffle having a plurality of ventilation holes spaced apart circumferentially along the baffle, each ventilation hole communicating with each heat dissipation hole.
[0015] In some embodiments, a plurality of air guides are formed on the side of the baffle facing away from the rotor core, and the position of each air guide corresponds to the position of each ventilation hole. When the rotor assembly is in a rotating state, each air guide can guide the airflow driven by the rotor assembly into each ventilation hole.
[0016] The present invention also provides an electric motor, including the aforementioned rotor assembly.
[0017] The present invention also provides a compressor, including the aforementioned motor.
[0018] The rotor assembly, motor, and compressor provided by this invention have the following beneficial effects: When the motor corresponding to the rotor assembly is used in a compressor, by constructing ventilation holes on the baffle and heat dissipation holes that extend through the length of the magnet, and connecting the ventilation holes and the heat dissipation holes, the airflow generated during the operation of the compressor can flow through the ventilation holes on the baffle and through the heat dissipation holes of the magnet, thereby effectively removing the heat generated by the magnet due to eddy currents and hysteresis effects, thereby reducing the temperature of the magnet, reducing the risk of demagnetization, and ensuring stable operation of the motor under high load conditions. Attached Figure Description
[0019] To more clearly illustrate the embodiments of the present invention 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.
[0020] Figure 1 This is a schematic diagram of the rotor assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a rotor assembly in an embodiment of the present invention, in which magnets are inserted into the rotor core. Figure 3 This is a perspective view of the magnets of the rotor assembly according to an embodiment of the present invention; Figure 4 This is a perspective view of the magnets of the rotor assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the baffle of the rotor assembly according to an embodiment of the present invention; Figure 6 This is a side view of the baffle of the rotor assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the baffle of the rotor assembly according to an embodiment of the present invention.
[0021] The reference numerals in the attached figures are as follows: 1. Rotor core; 2. Magnet; 3. Baffle; 4. Heat dissipation holes; 5. Ventilation holes; 6. Air guide. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, 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 invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention 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 invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0024] 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.
[0025] 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 should not be construed as limiting the scope of protection of this invention.
[0026] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, a rotor assembly is provided, including a rotor core 1, a magnet 2, and a baffle 3. The rotor core 1 has a receiving groove extending through its axial direction, the magnet 2 is inserted into the receiving groove, the magnet 2 has a heat dissipation hole 4 extending through its length direction, the baffle 3 is assembled at one end of the rotor core 1, and the baffle 3 has a ventilation hole 5, the ventilation hole 5 and the heat dissipation hole 4 are connected.
[0027] In this technical solution, when the motor corresponding to the rotor assembly is applied to the compressor, by constructing ventilation holes 5 on the baffle 3 and heat dissipation holes 4 that run through the length of the magnet 2, and connecting the ventilation holes 5 and the heat dissipation holes 4, the airflow generated during the operation of the compressor can flow through the ventilation holes 5 on the baffle 3 and through the heat dissipation holes 4 of the magnet 2, thereby effectively removing the heat generated by the magnet 2 due to eddy currents and hysteresis effects, thereby reducing the temperature of the magnet 2, reducing the risk of demagnetization, and ensuring stable operation of the motor under high load conditions.
[0028] See also Figure 3 and Figure 4 As shown, the heat dissipation hole 4 is inclined relative to the axial direction of the rotor core 1, and the inclination direction of the heat dissipation hole 4 is the same as the rotation direction of the rotor assembly in the rotating state.
[0029] In this embodiment, by designing the heat dissipation hole 4 as inclined, and making its inclination direction the same as the rotation direction of the rotor assembly in the rotating state, a smoother airflow path can be formed, allowing airflow to flow more smoothly through the heat dissipation hole 4, thereby improving heat dissipation efficiency and reducing the rotational resistance of the rotor assembly. Figure 2 Taking the magnet 2 at the top of the diagram as an example, the tilting direction of the heat dissipation hole 4 is the same as the rotation direction of the rotor assembly when it is rotating, which means that when the rotor assembly rotates counterclockwise, the heat dissipation hole 4 tilts from the right side of the magnet 2 at the top to the left side.
[0030] See Figure 3 As shown, the angle between the heat dissipation hole 4 and the axial direction of the rotor core 1 is A. When 0° < A < 60°, it indicates that the heat dissipation hole 4 has a reasonable tilt angle, which can ensure that the airflow flows smoothly through the heat dissipation hole 4. The heat dissipation hole 4 has a center line, and the axial direction of the rotor core 1 can be represented by a straight line that intersects the center line of the heat dissipation hole 4. The angle formed by this straight line and the center line is the angle A.
[0031] See Figure 4 As shown, the heat dissipation hole 4 includes a base section and an enlarged section, which are connected to the base section. The cross-sectional area of the enlarged section is larger than that of the base section. The enlarged section increases the flow area of a portion of the heat dissipation hole 4, thereby improving the heat dissipation capacity of the magnet 2. Moreover, the enlarged section is only a part of the heat dissipation hole 4 and will not have a significant impact on the structural strength of the magnet 2. Specifically, the enlarged section can be located in the middle of the heat dissipation hole 4, in which case there are two base sections, located on either side of the enlarged section.
[0032] See Figure 1 As shown, a guide body 6 is formed on the side of the baffle 3 facing away from the rotor core 1. When the rotor assembly is rotating, the guide body 6 can guide the airflow driven by the rotor assembly into the ventilation hole 5.
[0033] In this technical solution, the air guide body 6 guides more airflow into the ventilation hole 5, and then flows through the heat dissipation hole 4 of the magnet 2, thereby further improving the heat dissipation capacity of the magnet 2.
[0034] See Figure 1 As shown, the air guide 6 blocks one side of the ventilation hole 5, leaving the other side of the ventilation hole 5 exposed. When the rotor assembly is rotating, the exposed side of the ventilation hole 5 faces the direction of the incoming airflow. When the air guide 6 is configured in this way, the airflow will first flow through the exposed side of the ventilation hole 5, allowing some airflow to enter the ventilation hole 5 first. Then, the airflow will continue to travel and impact the air guide 6. After impacting the air guide 6, some airflow will be guided into the ventilation hole 5, thus enabling more airflow to enter the ventilation hole 5 and flow through the heat dissipation hole 4.
[0035] See Figure 1 As shown, the air guide 6 is inclined relative to the baffle 3, and the air guide 6 is inclined toward the side where the ventilation hole 5 is exposed. This allows the airflow to be pressed down after impacting the air guide 6, thereby guiding the airflow impacting the air guide 6 into the ventilation hole 5 as much as possible, further increasing the airflow entering the ventilation hole 5 and flowing through the heat dissipation hole 4.
[0036] See Figure 6 As shown, the included angle between the air guide 6 and the baffle 3 is B. When 30° < B < 60°, it ensures that the air guide 6 is not pressed too much downward relative to the baffle 3, giving the air guide 6 a large windward surface in the direction perpendicular to the baffle 3, and also ensures that the airflow impacting the air guide 6 is guided into the ventilation hole 5 almost to the maximum extent. It should be noted that the included angle B is the included angle formed between any side of the left or right side of the air guide 6 and the baffle 3.
[0037] See also Figure 6 and Figure 7 As shown, the radius of the ventilation hole 5 is r, and the height of the air guide 6 is H. When r < H < 5r, the air guide 6 has a reasonable height, which can intercept a large amount of airflow and guide it into the ventilation hole 5 without generating large wind resistance and affecting the speed of the motor.
[0038] See Figure 7As shown, the air guide 6 has an inner arc surface facing the incoming airflow direction. This inner arc surface has an inner arc line that connects with the baffle 3, surrounding the vent 5. The radius of the vent 5 is r, and the arc length of the inner arc line is L. When 0.5πr < L < 2πr is satisfied, the circumferential obstruction range of the air guide 6 on the vent 5 is moderate, resulting in a suitable ratio between the exposed and obstructed sides of the vent 5. This ensures that the sum of the airflow directly entering the vent 5 from the exposed side and the airflow introduced into the vent 5 by the air guide 6 remains within a large range, thereby ensuring sufficient airflow through the heat dissipation hole 4. Specifically, the air guide 6 is an inclined arc-shaped body with a constant width, which surrounds the vent 5.
[0039] See also Figure 1 and Figure 2 As shown, the rotor core 1 has multiple receiving slots extending along its axial direction, which are spaced apart circumferentially. Each receiving slot contains a magnet 2, and each magnet 2 has a heat dissipation hole 4 extending through its length. The baffle 3 has multiple ventilation holes 5, which are spaced apart circumferentially and connected to the respective heat dissipation holes 4. Each magnet 2 is inserted tangentially into its receiving slot.
[0040] In this embodiment, the airflow generated during compressor operation can flow through the ventilation holes 5 on the baffle 3 and then through the heat dissipation holes 4 on each magnet 2, thereby effectively removing the heat generated by eddy currents and hysteresis effects from each magnet 2, thus reducing the temperature of all magnets 2 and lowering the risk of demagnetization. To improve the heat dissipation effect of the airflow on each magnet 2, the number of heat dissipation holes 4 on each magnet 2 can be increased. For example, the number of heat dissipation holes 4 on each magnet 2 can be at least two, and the heat dissipation holes 4 are spaced apart along the width direction of the magnet 2. One ventilation hole 5 on the baffle 3 can be connected to all the heat dissipation holes 4 on one magnet 2. It should be noted that because the heat dissipation holes 4 are inclined and span a large area within the magnet 2, when viewed from the magnet 2, the heat dissipation holes 4 appear concentrated on one side of the magnet 2.
[0041] See also Figure 1 and Figure 5As shown, multiple air guides 6 are formed on the side of the baffle 3 facing away from the rotor core 1. The positions of each air guide 6 correspond to the positions of each ventilation hole 5. When the rotor assembly is rotating, each air guide 6 can guide the airflow driven by the rotor assembly into each ventilation hole 5. In this way, through the guiding effect of each air guide 6, more airflow can enter each ventilation hole 5 and then flow through the heat dissipation holes 4 of each magnet 2, thereby further improving the heat dissipation capacity of all magnets 2. It should be noted that when the radius of the baffle 3 is R, the radius of each ventilation hole 5 should satisfy 0 < r < 1 / 3R.
[0042] The present invention also provides an electric motor, including the aforementioned rotor assembly.
[0043] The present invention also provides a compressor, including the aforementioned motor.
[0044] 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.
[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. 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 the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.
Claims
1. A rotor assembly, characterized in that, The device includes a rotor core (1), a magnet (2), and a baffle (3). The rotor core (1) has a receiving groove that extends through its axial direction. The magnet (2) is inserted into the receiving groove. The magnet (2) has a heat dissipation hole (4) that extends through its length direction. The baffle (3) is mounted on one end of the rotor core (1). The baffle (3) has a ventilation hole (5) that is connected to the heat dissipation hole (4).
2. The rotor assembly according to claim 1, characterized in that, The heat dissipation hole (4) is inclined relative to the axial direction of the rotor core (1), and the inclination direction of the heat dissipation hole (4) is the same as the rotation direction of the rotor assembly in the rotating state.
3. The rotor assembly according to claim 2, characterized in that, The included angle between the heat dissipation hole (4) and the axial direction of the rotor core (1) is A, where 0° < A < 60°.
4. The rotor assembly according to claim 1, characterized in that, The heat dissipation hole (4) includes a base section and an enlarged section, the enlarged section and the base section are connected, and the cross-sectional area of the enlarged section is larger than the cross-sectional area of the base section.
5. The rotor assembly according to any one of claims 1 to 4, characterized in that, The baffle (3) has a guide body (6) formed on the side facing away from the rotor core (1). When the rotor assembly is in a rotating state, the guide body (6) can guide the airflow driven by the rotor assembly into the ventilation hole (5).
6. The rotor assembly according to claim 5, characterized in that, The air guide (6) blocks one side of the ventilation hole (5), and the other side of the ventilation hole (5) is exposed. When the rotor assembly is rotating, the exposed side of the ventilation hole (5) faces the direction of the incoming airflow.
7. The rotor assembly according to claim 6, characterized in that, The air guide (6) is inclined relative to the baffle (3), and the air guide (6) is inclined toward the side where the ventilation hole (5) is exposed.
8. The rotor assembly according to claim 7, characterized in that, The included angle between the air guide (6) and the baffle (3) is B, where 30° < B < 60°.
9. The rotor assembly according to any one of claims 6 to 8, characterized in that, The radius of the ventilation hole (5) is r, and the height of the air guide (6) is H, where r < H < 5r.
10. The rotor assembly according to any one of claims 6 to 8, characterized in that, The air guide (6) has an inner arc surface facing the direction of the airflow. The inner arc surface has an inner arc line that connects with the baffle (3). The inner arc line surrounds the periphery of the ventilation hole (5). The radius of the ventilation hole (5) is r, and the arc length of the inner arc line is L, where 0.5πr < L < 2πr.
11. The rotor assembly according to claim 1, characterized in that, The rotor core (1) has a plurality of receiving slots extending along its axial direction. Each receiving slot is distributed circumferentially around the rotor core (1). Each receiving slot is fitted with a magnet (2). Each magnet (2) has a heat dissipation hole (4) extending through its length. The baffle (3) has a plurality of ventilation holes (5). Each ventilation hole (5) is distributed circumferentially around the baffle (3), and each ventilation hole (5) is connected to each heat dissipation hole (4).
12. The rotor assembly according to claim 9, characterized in that, The baffle (3) has a plurality of air guides (6) on the side facing away from the rotor core (1). The position of each air guide (6) corresponds to the position of each ventilation hole (5). When the rotor assembly is in a rotating state, each air guide (6) can guide the airflow driven by the rotor assembly into each ventilation hole (5).
13. An electric motor, characterized in that it includes the rotor assembly as described in any one of claims 1 to 12.
14. A compressor, characterized in that it includes the motor as described in claim 13.