Permanent magnet synchronous motor and rotor structure thereof

Abstract

The utility model relates to motor technical field especially relates to a kind of permanent magnet synchronous motor and its rotor structure, including rotating shaft, the rotating shaft is equipped with multiple rotor laminations, the rotor lamination is equipped with multiple first through-hole multiple second through-hole, all the rotor laminations jointly embed multiple permanent magnets, the permanent magnet is located in the first through-hole, two adjacent the permanent magnet is symmetrically arranged in V shape, the second through-hole on all the rotor laminations is sequentially arranged in spiral, for guiding gas to flow through each the second through-hole when rotor rotates.The utility model is arranged on the rotor lamination by the second through-hole of spiral arrangement, when rotor rotates, these spiral distribution's through-hole plays the role similar to spiral channel, actively guides and promotes airflow to flow along rotor axial rapidly, forms enhanced internal ventilation effect, to realize the uniform cooling of all rotor laminations.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a permanent magnet synchronous motor and its rotor structure. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs), with their high efficiency, high power density, high torque density, and excellent dynamic response characteristics, have been widely used in new energy vehicles, industrial drives, wind power generation, and home appliances. The rotor, as its core component, mainly consists of rotor laminations, permanent magnets, and a shaft. The permanent magnets directly participate in the establishment of the main magnetic field and are key components for electromechanical energy conversion. Under continuous operation or high load conditions, heat inevitably accumulates inside the rotor, primarily from eddy current losses and hysteresis losses in the permanent magnets under alternating magnetic fields, as well as iron losses caused by armature reaction in the rotor core. These losses lead to heat accumulation inside the rotor, and if not dissipated in time, will cause a significant temperature rise. Currently, most rotors rely on air convection for cooling, but due to the smaller contact area between the central laminations and the outside air, the heat dissipation capacity is weak, resulting in a generally higher temperature in this area compared to the ends, creating a significant temperature unevenness. Excessively high local temperatures not only weaken the magnetic properties of the permanent magnets but can also, in severe cases, cause irreversible demagnetization, leading to a decrease in motor output torque and efficiency. Meanwhile, the thermal stress generated by the temperature gradient may cause cracks in the permanent magnet or loosening of the fixed structure during long-term operation, threatening the integrity of the rotor structure and thus affecting the reliability and service life of the motor. Utility Model Content

[0003] To overcome the above problems, this utility model provides a permanent magnet synchronous motor and its rotor structure.

[0004] Technical solution: A rotor structure for a permanent magnet synchronous motor includes a shaft, on which multiple rotor laminations are mounted. Each rotor lamination has multiple first through holes and multiple second through holes. All the rotor laminations are embedded with multiple permanent magnets, which are located within the first through holes. Adjacent permanent magnets are arranged symmetrically in a V-shape. The second through holes are used to reduce the weight of the rotor laminations. The second through holes on all the rotor laminations are arranged in a spiral pattern to guide gas flow through each second through hole when the rotor rotates.

[0005] More preferably, the rotor laminations are provided with a plurality of third through holes that are circumferentially equidistant, and the third through holes on two adjacent rotor laminations are connected to each other. The third through holes are used to promote uniform heat dissipation on the rotor laminations.

[0006] More preferably, the rotor laminations are provided with annular grooves on both sides, and the annular grooves are connected to the adjacent second through holes. The two adjacent rotor laminations are combined to form an annular cavity by the two fitting annular grooves.

[0007] More preferably, the rotor laminations are provided with a plurality of fourth through holes, which are used to connect two adjacent second through holes. The fourth through holes are inclined and the rotation of the rotor laminations causes the fourth through holes on them to drive the gas flow.

[0008] More preferably, the two outermost rotor laminations are fixed with a plurality of circumferentially equidistant fixing plates. The closer the fixing plate is to the adjacent rotor lamination in the axial direction of the rotor lamination, the larger its cross-section is, which is used to drive the gas flow.

[0009] A permanent magnet synchronous motor includes a rotor structure and a motor housing, wherein the motor housing is rotatably connected to the rotating shaft via a bearing assembly.

[0010] Compared with the prior art, this utility model has the following advantages: By setting a spirally arranged second through hole on the rotor laminations, when the rotor rotates, these spirally distributed through holes act like spiral channels, actively guiding and pushing the airflow to flow rapidly along the rotor axis, forming an enhanced internal ventilation effect, thereby achieving uniform cooling of all rotor laminations; through the driving effect of the fourth through hole and the fixing plate, the gas flows rapidly, alleviating the problem of local overheating caused by poor heat dissipation in the middle of all rotor laminations, helping to suppress the risk of permanent magnet demagnetization, and improving the reliability and lifespan of the motor operation. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the rotating shaft and rotor laminations of this utility model; Figure 3 This is a three-dimensional structural diagram of the rotor laminations and permanent magnet of this utility model; Figure 4 This is a first cross-sectional view of the rotor laminations of this utility model; Figure 5 This is a second cross-sectional view of the rotor laminations of this utility model; Figure 6 This is a third cross-sectional view of the rotor laminations of this utility model.

[0012] The above-mentioned figures include the following reference numerals: 1. Rotary shaft, 2. Rotor laminations, 201. First through hole, 202. Second through hole, 203. Third through hole, 204. Annular groove, 205. Fourth through hole, 3. Permanent magnet, 4. Fixing plate, 5. Motor housing. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0014] Example: A rotor structure for a permanent magnet synchronous motor, such as... Figures 1-4 As shown, the device includes a rotating shaft 1, on which seven rotor laminations 2 are mounted. Each rotor lamination 2 has eight first through holes 201 and sixteen second through holes 202. The eight first through holes 201 are circumferentially equidistant, and the sixteen second through holes 202 are divided into eight circumferentially equidistant groups. The seven rotor laminations 2 collectively embed sixteen permanent magnets 3, which are located within the first through holes 201. Adjacent permanent magnets 3 are arranged in a V-shape symmetrical arrangement. The second through holes 202 are used to reduce the weight of the rotor laminations 2. The second through holes 202 on all rotor laminations 2 are arranged in a spiral pattern. This spiral arrangement increases the contact area between the seven rotor laminations 2 and the external gas, facilitating heat dissipation and cooling of all rotor laminations 2. The rotation of all rotor laminations 2 causes the spirally arranged second through holes 202 on them to drive the gas flow.

[0015] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the rotor lamination 2 has eight circumferentially equidistant third through holes 203. The third through holes 203 on two adjacent rotor laminations 2 are connected. The third through holes 203 are used to promote uniform heat dissipation on the rotor lamination 2. Both sides of the rotor lamination 2 have annular grooves 204. The annular grooves 204 are connected to the adjacent second through holes 202. The combination of two adjacent rotor laminations 2 makes the two annular grooves 204 in contact form an annular cavity for uniform cooling of the rotor lamination 2 in the circumferential direction. The rotor lamination 2 has eight sets of fourth through holes 205 circumferentially equidistant. Each set of fourth through holes 205 includes three equidistant ones. The fourth through holes 205 are used to connect two adjacent second through holes 202. The fourth through holes 205 are inclined. The rotation of the rotor lamination 2 causes the fourth through holes 205 on it to drive the gas flow.

[0016] like Figure 2 and Figure 6As shown, the two outermost rotor laminations 2 are fixed with eight circumferentially equidistant fixing plates 4. The closer the fixing plate 4 is to the adjacent rotor lamination 2 in the axial direction, the larger its cross-section is, which is used to drive the gas flow.

[0017] like Figure 1 As shown, a permanent magnet synchronous motor includes a rotor structure and a motor housing 5. The motor housing 5 is rotatably connected to the rotating shaft 1 through a bearing assembly.

[0018] Working Distance: During the operation of this device, the rotating shaft 1 drives the seven rotor laminations 2 to rotate. The rotor laminations 2 simultaneously drive the fixed plate 4 to rotate. The rotation of the fixed plate 4 drives the gas to flow inside the motor housing 5. At the same time, during the circumferential rotation of the spirally arranged second through holes 202, the gas quickly passes through the seven second through holes 202, which facilitates the rapid cooling of the four rotor laminations 2. Simultaneously, the rotation of the rotor laminations 2 causes the fourth through hole 205 on them to further drive the gas flow, allowing the gas to pass through the channel formed by the spirally arranged second through holes 202 more quickly. During this process, the flowing gas rotates in the annular cavity formed by two adjacent annular grooves 204, which facilitates the uniform cooling of the rotor laminations 2. At the same time, under the action of the third through hole 203, the rotor laminations 2 are in contact with the air in different areas, which further ensures that the rotor laminations 2 dissipate heat evenly, avoids the rotor laminations 2 rotating at high temperatures, and extends the service life of the motor.

[0019] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A rotor structure for a permanent magnet synchronous motor, characterized in that, The device includes a rotating shaft (1) on which multiple rotor laminations (2) are mounted. Each rotor lamination (2) has multiple first through holes (201) and multiple second through holes (202). All rotor laminations (2) are embedded with multiple permanent magnets (3). The permanent magnets (3) are located in the first through holes (201). Two adjacent permanent magnets (3) are arranged in a V-shape symmetrically. The second through holes (202) are used to reduce the weight of the rotor laminations (2). The second through holes (202) on all rotor laminations (2) are arranged in a spiral pattern to guide gas flow through each second through hole (202) when the rotor rotates.

2. The rotor structure of a permanent magnet synchronous motor according to claim 1, characterized in that, The rotor lamination (2) has a plurality of third through holes (203) distributed circumferentially. The third through holes (203) on two adjacent rotor laminations (2) are connected. The third through holes (203) are used to promote the uniform dissipation of heat on the rotor lamination (2).

3. The rotor structure of a permanent magnet synchronous motor according to claim 2, characterized in that, Both sides of the rotor lamination (2) are provided with annular grooves (204). The annular grooves (204) are connected to the adjacent second through hole (202). The two adjacent rotor laminations (2) are combined to form annular cavity by the two fitting annular grooves (204).

4. The rotor structure of a permanent magnet synchronous motor according to claim 3, characterized in that, The rotor lamination (2) has multiple fourth through holes (205), which are used to connect two adjacent second through holes (202). The fourth through holes (205) are inclined, and the rotor lamination (2) rotates to drive the gas flow through the fourth through holes (205).

5. The rotor structure of a permanent magnet synchronous motor according to claim 4, characterized in that, The two outermost rotor laminations (2) are fixed with a plurality of circumferentially equidistant fixing plates (4). The closer the fixing plate (4) is to the adjacent rotor lamination (2) in the axial direction, the larger its cross-section is, which is used to drive the gas flow.

6. A permanent magnet synchronous motor, characterized in that, It includes the rotor structure of the permanent magnet synchronous motor as described in claim 5 and the motor housing (5), wherein the motor housing (5) is rotatably connected to the rotating shaft (1) via a bearing assembly.

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