Permanent magnet synchronous motor

Abstract

The invention relates to the related technical field of motors, discloses a permanent magnet synchronous motor, and aims to solve the problem of internal heat accumulation caused by non-circulation of internal airflow of the motor. A right heat dissipation arm and a left heat dissipation arm which are communicated with an inner cavity of a motor shell are fixedly mounted on the outer side of the motor shell; the rotating shaft can drive the inner heat dissipation fan and the outer heat dissipation fan to work synchronously, the outer heat dissipation fan can blow external airflow into the outer side of the motor shell, so that heat dissipation of the outer side of the motor shell is achieved, the inner heat dissipation fan is used for conveying airflow in the motor shell into the left / right heat dissipation arm, and heat dissipation of the motor shell is achieved. The left / right heat dissipation arms enable the high-temperature air flow in the motor shell to extend outwards for heat dissipation, the phenomenon of permanent magnet demagnetization caused by heat accumulation in the motor shell is avoided, and finally the effects of increasing heat dissipation channels and increasing heat dissipation space are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a permanent magnet synchronous motor. Background Art

[0002] A permanent magnet synchronous motor is a synchronous motor that uses permanent magnets to generate a magnetic field. This type of motor has been widely used in many fields due to its high efficiency and compact design. During actual operation, since the permanent magnets are the main source of the magnetic field, the motor is sensitive to the operating temperature. Once the motor temperature continues to rise, it may cause the demagnetization of the permanent magnets, which will directly affect the performance and service life of the motor.

[0003] Traditionally, to address the heat dissipation problem of the motor, a common method is to add heat dissipation fins to the metal shell of the motor. However, the heat dissipation fins mainly rely on the external space of the shell for heat dissipation, which results in relatively limited heat dissipation space, thus restricting the heat dissipation efficiency. More importantly, since the main heat sources of the motor are usually located inside, such as components like the stator winding and rotor, heat dissipation only through the shell cannot effectively discharge the internal heat, and thus cannot achieve an efficient heat dissipation effect. Summary of the Invention

[0004] The present invention provides a permanent magnet synchronous motor, which has the advantages of increasing heat dissipation channels and enlarging the heat dissipation space, to solve the problem of internal heat accumulation in the motor caused by non - circulating internal air flow as mentioned in the above background art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A permanent magnet synchronous motor, comprising: a controller applies three - phase current to a stator assembly, and the stator assembly generates a rotating magnetic field to drive a rotor assembly to drive a rotating shaft to rotate synchronously; an external cooling fan, fixed outside the rotating shaft, uses a wind - gathering cover for air flow guidance, and the externally flowing air takes away the heat dissipated from the outside of the motor housing; on the outside of the motor housing, a right heat dissipation arm and a left heat dissipation arm connected to the inner cavity of the motor housing are fixedly installed, and an internal cooling fan is installed outside the rotating shaft inside the motor housing. The internal cooling fan realizes the internal air circulation inside the motor housing, so that the air flow in the inner cavity of the motor housing passes through the right heat dissipation arm and the left heat dissipation arm for heat dissipation and temperature reduction.

[0006] Further, a plurality of exhaust grooves are evenly distributed at equal angles on the surface of the internal cooling fan, and a wind - gathering seat is fixedly connected to the outside of the exhaust grooves on the surface of the internal cooling fan.

[0007] Further, the side shape of the wind - gathering seat is triangular.

[0008] Further, a synchronous rod is fixedly installed on the surface of the internal cooling fan. After passing through the rotating shaft, the synchronous rod is connected to the external cooling fan through a bearing.

[0009] Further, the input ends between the right heat dissipation arm and the left heat dissipation arm are relatively staggered.

[0010] Furthermore, a pressure limiting air valve is fixedly installed at the end of the left cooling arm.

[0011] Furthermore, a damping chamber is provided in the middle of the rotating shaft, a piston push rod is movably mounted in the damping chamber, a power adjustment column is fixedly mounted on the end of the piston push rod, and a fan disk driving column is threadedly connected to the end of the external heat dissipation fan.

[0012] Furthermore, a limiting seat located in the inner cavity of the wind collecting cover is fixedly installed at the end of the rotating shaft.

[0013] Furthermore, a spring is fixedly installed between the piston push rod and the rotating shaft, a return air duct is opened in the rotating shaft at the left end of the damping chamber, the opening of the return air duct is at the right limit of movement of the internal cooling fan, and a speed reduction damping hole is opened in the rotating shaft at the right end of the damping chamber, and the opening of the speed reduction damping hole is located near the stator assembly and the rotor assembly.

[0014] Furthermore, a one-way air valve is fixed in the middle of the rotating shaft.

[0015] The present invention has the following beneficial effects:

[0016] The present invention provides a permanent magnet synchronous motor, in which a right heat dissipation arm and a left heat dissipation arm are fixedly connected through the outer side of the motor housing, and the two are closely connected with the inner cavity of the motor. When the motor is started and put into operation, the rotating shaft not only drives the main functional components of the motor, but also activates the built-in inner heat dissipation fan and the external outer heat dissipation fan, so that they start to work synchronously.

[0017] The operating mechanism of the external cooling fan is that it can effectively introduce fresh air from the outside into the outer area of ​​the motor housing, and remove the heat on the surface of the motor housing through the flow of air, thereby achieving effective heat dissipation on the outside of the motor housing. At the same time, the internal cooling fan extracts the hot air accumulated inside the motor housing and guides it to the left and right cooling arms. These two cooling arms are designed to be spacious and efficient. They can guide the high-temperature airflow inside the motor housing to extend outward along a specific path, ensuring that the heat can be quickly and fully dissipated to the surrounding environment.

[0018] This innovative design not only significantly increases the number of heat dissipation channels, allowing heat to have more ways to escape, but also greatly expands the heat dissipation space, ensuring the effective discharge of heat inside the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] The present invention may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0021] Figure 1 Schematic diagram of the overall external three-dimensional structure of the present invention;

[0022] Figure 2 Schematic diagram of the overall internal three-dimensional structure of the present invention;

[0023] Figure 3 Schematic diagram of the front internal sectional structure of the whole of the present invention;

[0024] Figure 4 Schematic diagram of the front three-dimensional structure between the external radiator fan and the synchronizing rod of the present invention;

[0025] Figure 5 Schematic diagram of the back three-dimensional structure between the external radiator fan and the synchronizing rod of the present invention;

[0026] Figure 6 Schematic diagram of the positions and three-dimensional structures of the components inside the rotating shaft of the present invention.

[0027] In the figure: 1, motor housing; 2, air collecting hood; 3, controller; 4, right heat dissipation arm; 5, left heat dissipation arm; 6, rotating shaft; 600, damping cavity; 601, return air duct; 602, speed reduction damping hole; 603, one-way air valve; 7, stator assembly; 8, rotor assembly; 9, internal radiator fan; 900, exhaust groove; 10, air collecting seat; 11, synchronizing rod; 12, external radiator fan; 121, fan disk driving column; 122, bearing; 13, limit seat; 14, pressure limiting air valve; 15, piston push rod; 150, spring; 16, power adjustment column. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1, please refer to Figures 1 - 3It can be seen that when an external power supply is connected to the controller 3, the controller 3 applies three-phase current to the stator assembly 7 side, and the stator assembly 7 generates a rotating magnetic field. Since pre-magnetized permanent magnets are installed on the rotor assembly 8, these permanent magnets can generate a strong magnetic field during rotation, interact with the rotating magnetic field in the stator assembly 7, thereby generating torque, and driving the rotating shaft 6 coaxially fastened to the rotor assembly 8 to rotate synchronously. Generally, a load and an external radiator fan 12 are connected to the outside of the rotating shaft 6. When the external radiator fan 12 rotates with the rotating shaft 6, due to the blades with a certain inclination angle arranged on the outside, the air flow is guided by the air collecting cover 2, so that the air flow blows to the outside of the motor housing 1, thus completing the heat dissipation of the motor housing 1, which is also a commonly used heat dissipation method for motors at present.

[0030] Since the heat sources of the motor are mainly located in the stator assembly 7 and the rotor assembly 8, both of which are located in the inner cavity of the motor housing 1. Since the air inside the motor housing 1 does not circulate, this may lead to the problem of local heat accumulation in the motor, and thus the problem of demagnetization of the permanent magnet at high temperature. In order to prevent such a phenomenon from occurring, in the process of applying the first embodiment, a right heat dissipation arm 4 and a left heat dissipation arm 5 communicating with the inner cavity of the motor housing 1 are fixedly installed on the outside of the motor housing 1. From Figure 1 It can be clearly seen that the added right heat dissipation arm 4 and left heat dissipation arm 5 can extend the actual heat dissipation space of the motor outwards, so as to further increase the heat dissipation area. Not only that, combined with Figure 2 、 Figure 3 and Figure 5 It can be seen that an inner radiator fan 9 located inside the motor housing 1 is installed on the outside of the rotating shaft 6. The inner radiator fan 9 is in the shape of an annular disc, and a plurality of exhaust grooves 900 are arranged at equal angles on its surface. The exhaust grooves 900 provide conditions for air circulation. On the surface of the inner radiator fan 9 and on the corresponding outer side of the exhaust grooves 900, there is a wind collecting seat 10 fastened by bolts. The side shape of the wind collecting seat 10 is triangular. Referring to Figure 3 It can be clearly seen that generally, the outside of the inner radiator fan 9 is movably sleeved with the inner side of the motor housing 1. When the rotating shaft 6 drives the wind collecting seat 10 to rotate synchronously, the wind collecting seat 10 will pour the air flow around the stator assembly 7 and the rotor assembly 8 into the exhaust grooves 900. Since the air pressure in the right inner cavity of the motor housing 1 increases, the air flow is forced to be conveyed into the right heat dissipation arm 4 and the left heat dissipation arm 5, and the heat dissipation of the inside of the motor housing 1 is realized by using the extended right heat dissipation arm 4 and left heat dissipation arm 5. And, through the relatively sealed air flow circulation inside the motor housing 1, not only can the problem of local heat accumulation be avoided, but also the external environment can be prevented from eroding the components inside the motor housing 1, ensuring that the motor housing 1 can obtain more efficient heat dissipation conditions under relatively sealed conditions.

[0031] In the actual application of the first embodiment, when the rotating shaft 6 starts to work, the inner cooling fan 9 and the outer cooling fan 12 are driven by the rotating shaft 6 to work synchronously. The inner cooling fan 9 realizes the internal air circulation inside the motor housing 1, so that the air flow in the inner cavity of the motor housing 1 passes through the right heat dissipation arm 4 and the left heat dissipation arm 5 for heat dissipation and cooling; the outer cooling fan 12 realizes the gas flow outside the motor housing 1, and uses the external flowing air flow to take away the heat dissipated from the left / right heat dissipation arms and the outside of the motor housing 1, thereby further increasing the heat dissipation effect of the motor.

[0032] The second embodiment is a further improvement based on the first embodiment. Please refer to Figures 3 - 6 It can be seen that in order to realize the alternating operation between the right heat dissipation arm 4 and the left heat dissipation arm 5 and ensure that the right heat dissipation arm 4 and the left heat dissipation arm 5 can efficiently dissipate the air flow inside the motor housing 1. It should be noted that both the inner cooling fan 9 and the outer cooling fan 12 in the second embodiment can reciprocate along the axial direction of the rotating shaft 6. Moreover, synchronizing rods 11 are fixedly installed on the surface of the inner cooling fan 9 at equal angles. After passing through the rotating shaft 6, the synchronizing rods 11 are connected to the outer cooling fan 12 outside the motor housing 1 through bearings 122. Generally speaking, the outer ring of the bearing 122 is relatively fixed to the outer cooling fan 12, and the inner ring is relatively fixed to the synchronizing rod 11, so as to ensure that the rotation of the outer cooling fan 12 will not affect the inner cooling fan 9. Since the synchronizing rod 11 and the rotating shaft 6 are connected by sleeving, when the rotating shaft 6 rotates, it can drive the inner cooling fan 9 to rotate synchronously. In actual application, since the size of the outer cooling fan 12 is relatively larger than that of the inner cooling fan 9, when the outer cooling fan 12 rotates, the air flow passing through the outer cooling fan 12 will generate an axial force that causes the outer cooling fan 12 to move to the right. The direction is referenced Figure 3 ., the outer cooling fan 12 has a tendency to pull the inner cooling fan 9 to move to the right by using the synchronizing rod 11, so that the inner cooling fan 9 sequentially passes through the air flow input ends between the right heat dissipation arm 4 and the left heat dissipation arm 5. From Figure 2 It can be clearly seen that the input ends between the right heat dissipation arm 4 and the left heat dissipation arm 5 are relatively staggered. When the inner cooling fan 9 continues to move to the right and after the inner cooling fan 9 passes over the right heat dissipation arm 4, the air flow delivered to the right can only flow through the left heat dissipation arm 5. At this time, there is no input of high-temperature air flow in the right heat dissipation arm 4, thereby increasing its cooling efficiency.

[0033] In order to ensure that single and controllable heat dissipation can be carried out between the right heat dissipation arm 4 and the left heat dissipation arm 5, combined with Figure 2It can be seen that a pressure-limiting air valve 14 is fixedly installed at the end of the left heat dissipation arm 5 and at the input port. The pressure-limiting air valve 14 is usually composed of components such as a valve body, a valve core, and a spring. The valve body is the main part of the air valve, responsible for accommodating and supporting other components. The valve core is a key component in the air valve, and its displacement determines the opening and closing of the air valve. The spring plays a role in resetting and regulating pressure. When the pressure exceeds the set value, the spring is compressed and the valve core is pushed open; when the pressure decreases, the spring returns to its original state and pushes the valve core back to the initial position. During the actual application process, when the internal heat dissipation fan 9 rotates, it will blow the air flow to the right. Since the input ends of the right heat dissipation arm 4 and the left heat dissipation arm 5 are both on the right side of the internal heat dissipation fan 9 at this time, the right-side air flow will be unidirectionally transported through the right heat dissipation arm 4, and there will be no air flow passing through the left heat dissipation arm 5, and it can dissipate heat quickly by itself; similarly, when the internal heat dissipation fan 9 passes over the input end of the right heat dissipation arm 4, the air flow transported to the right can only be input from the left heat dissipation arm 5. When the pressure on the right side of the internal heat dissipation fan 9 increases, it will cause the pressure-limiting air valve 14 to open, and the left heat dissipation arm 5 is used to complete the internal circulation of the air flow in the motor housing 1. At this time, the right heat dissipation arm 4 is in a non-working cooling state.

[0034] In order to enable the internal heat dissipation fan 9 to move back and forth at a low speed periodically, combined with Figures 3 - 6 It can be seen that a damping cavity 600 is opened in the middle of the rotating shaft 6. A piston push rod 15 is movably sleeved in the damping cavity 600. The piston push rod 15 is coaxially arranged with the rotating shaft 6, and a power adjustment column 16 that extends from the side of the rotating shaft 6 and is placed on one side of the external heat dissipation fan 12 is fixedly installed at the push rod end of the piston push rod 15. Correspondingly, a fan disk drive column 121 is threadedly connected to the end of the external heat dissipation fan 12. When the power adjustment column 16 is located at the end of the fan disk drive column 121, the power adjustment column 16 is driven to rotate by the rotating shaft 6, and the power adjustment column 16 will eventually abut against the fan disk drive column 121, thereby forcing the external heat dissipation fan 12 to rotate synchronously. Moreover, a limit seat 13 located in the inner cavity of the air gathering hood 2 is fixedly installed at the end of the rotating shaft 6. The shape of the limit seat 13 is "U" shaped. The limit seat 13 can be used to block and limit the rightward moving external heat dissipation fan 12, thereby determining the rightward limit position of the external heat dissipation fan 12. In actual arrangement, the power adjustment column 16 is preferably a rolling rod, so that when the power adjustment column 16 moves along the axial direction of the fan disk drive column 121, it is convenient for the power adjustment column 16 and the fan disk drive column 121 to be disengaged.

[0035] A spring 150 located outside the push rod is fixedly installed between the piston push rod 15 and the rotating shaft 6. Under the elastic force of the spring 150, the piston push rod 15 has a tendency to move to the left. Eventually, the power adjustment column 16 can be attached to the end of the external heat dissipation fan 12, and when the power adjustment column 16 rotates following the rotating shaft 6, it can push the fan disk drive column 121 to realize the rotation of the external heat dissipation fan 12.

[0036] Combined with Figure 3 andFigure 6 It can be seen that an air return passage 601 is provided in the rotating shaft 6 at the left end of the damping chamber 600. The opening of the air return passage 601 is at the right movement limit position of the inner heat dissipation fan 9. That is, after the inner heat dissipation fan 9 moves to the right limit, the inner side of the inner heat dissipation fan 9 can block the air return passage 601. The diameter of the air return passage 601 is relatively large, so that the air flow in the inner cavity of the motor housing 1 can be quickly replenished into the left chamber of the damping chamber 600; a speed reduction damping hole 602 is also provided in the rotating shaft 6 at the right end of the damping chamber 600. The opening of the speed reduction damping hole 602 is near the stator assembly 7 and the rotor assembly 8. The diameter of the speed reduction damping hole 602 is relatively small. When the piston push rod 15 moves to the right and squeezes the air flow in the damping chamber 600, the air flow in the damping chamber 600 will slowly flow out from the speed reduction damping hole 602, thereby restricting the speed of the piston push rod 15 moving to the right. On this basis, a one-way air valve 603 is fixed in the middle of the rotating shaft 6 on one side of the air return passage 601, and the one-way air valve 603 can be used to unidirectionally transport air flow into the damping chamber 600.

[0037] In the actual application process of the second embodiment, when the motor stops working, the piston push rod 15 moves to the left under the elastic force of the spring 150. Refer to Figure 3 , the power adjustment column 16 drives the outer heat dissipation fan 12 to move to the left synchronously until the power adjustment column 16 abuts against the surface of the outer heat dissipation fan 12, and the inner heat dissipation fan 9 also moves to the left limit at this time.

[0038] After the controller 3 is powered on, the controller 3 drives the rotating shaft 6 to rotate through the stator assembly 7 and the rotor assembly 8. During the rotation of the rotating shaft 6, it will drive the inner heat dissipation fan 9 to rotate synchronously. The inner heat dissipation fan 9 conveys the air flow on the left to the right and preferentially enters the right heat dissipation arm 4 for circulation. At the same time, when the air flow passes through the air collecting seat 10, the air collecting seat 10 also has a tendency to drive the inner heat dissipation fan 9 to move to the left; during the rotation of the rotating shaft 6 driving the power adjustment column 16, the power adjustment column 16 will eventually abut against the fan disk driving column 121, forcing the power adjustment column 16 to push the outer heat dissipation fan 12 to rotate synchronously through the fan disk driving column 121, and blowing the air flow in the air collecting hood 2 to the outside of the motor housing 1 to cool the outside of the motor housing 1. During the rotation of the outer heat dissipation fan 12, the air flow passing through the blades of the outer heat dissipation fan 12 forces the outer heat dissipation fan 12 to have a tendency to move to the right. After that, the outer heat dissipation fan 12 pushes the power adjustment column 16 to move to the right synchronously, and compresses the spring 150 through the piston push rod 15. The outer heat dissipation fan 12 drives the inner heat dissipation fan 9 to move to the right synchronously through the synchronizing rod 11. It can be seen from this that the axial force generated by the rotation of the outer heat dissipation fan 12 to the right can overcome the elastic force of the spring 150 and the axial force generated by the rotation of the inner heat dissipation fan 9 to move to the left.

[0039] When the piston push rod 15 moves to the right, the air in the damping chamber 600 will be squeezed. The one-way air valve 603 cannot release the air flow in the damping chamber 600 into the inner cavity of the motor housing 1. Therefore, the air in the damping chamber 600 can only slowly flow out from the speed reduction damping hole 602, thereby realizing the slow movement of the piston push rod 15 to the right.

[0040] When the inner heat dissipation fan 9 passes over the input port of the right heat dissipation arm 4, the air flow pressure delivered by the inner heat dissipation fan 9 to the right inner cavity of the motor housing 1 will relatively increase, thereby forcing the pressure-limiting air valve 14 to connect, so that the air flow on the right side of the inner cavity of the motor housing 1 starts to cool down through the left heat dissipation arm 5, and the right heat dissipation arm 4 is in a non-working cooling state. Since the pressure in the damping chamber 600 is relatively greater than the pressure in the inner cavity of the motor housing 1 at this time, even if the pressure in the inner cavity of the motor housing 1 relatively increases at this time, it is impossible to inject air flow into the damping chamber 600 through the one-way air valve 603.

[0041] As the outer heat dissipation fan 12 continues to move to the right, when the inner heat dissipation fan 9 passes over the input port of the left heat dissipation arm 5, the limit seat 13 blocks the outer heat dissipation fan 12. At this time, the inner heat dissipation fan 9 moves to the right and blocks the return air duct 601, and the piston push rod 15 will also pass over the one-way air valve 603. As the inner heat dissipation fan 9 rotates continuously, the air flow will be input into the right inner cavity of the motor housing 1 again. Since the inner heat dissipation fan 9 has passed over the right heat dissipation arm 4 and the left heat dissipation arm 5, at this time, the right inner cavity of the motor housing 1 is in a relatively sealed state. As the inner heat dissipation fan 9 continuously inputs the air flow, the pressure on the right side of the motor housing 1 will further rise, resulting in the pressure in the inner cavity of the motor housing 1 being relatively greater than the pressure in the inner cavity of the damping chamber 600, and entering the damping chamber 600 on the left side of the piston push rod 15 through the one-way air valve 603, thereby further pushing the piston push rod 15 to the right.

[0042] After the piston push rod 15 continues to move to the right, the power adjustment column 16 will move axially and to the right along the fan disk drive column 121 until the power adjustment column 16 is disengaged from the fan disk drive column 121, and the power adjustment column 16 will no longer provide the driving power for the external radiator fan 12. After that, the continuous rotation of the internal radiator fan 9 will pull the external radiator fan 12 to move synchronously by the axial force that makes the internal radiator fan 9 move to the left, causing the internal radiator fan 9 to quickly move to the left extreme. Since the internal radiator fan 9 will no longer provide pressure to the left side of the piston push rod 15 during the process of moving to the left, the piston push rod 15 moves to the left under the elastic force of the spring 150. At this time, only the air flow can be slowly inhaled through the speed reduction damping hole 602 in the damping cavity 600 on the right side of the piston push rod 15, making the initial moving speed of the piston push rod 15 relatively slow, so as to ensure that the internal radiator fan 9 has enough time to move to the left extreme. The piston push rod 15 continuously moves to the left. When the piston push rod 15 crosses the one-way air valve 603, since the pressure in the inner cavity of the damping cavity 600 is less than the pressure in the inner cavity of the motor housing 1 at this time, the air flow in the inner cavity of the motor housing 1 will quickly flow into the damping cavity 600 on the right side of the piston push rod 15 from the one-way air valve 603, forcing the piston push rod 15 to quickly move to the left until the power adjustment column 16 is attached to the end of the external radiator fan 12 again. Finally, when the rotating power adjustment column 16 contacts the fan disk drive column 121 again, it will push the external radiator fan 12 to rotate again, and work cyclically according to the above content to complete the periodic independent work between the right heat dissipation arm 4 and the left heat dissipation arm 5.

Claims

1. A permanent magnet synchronous motor, characterized in that: include: The controller (3) applies a three-phase current to the stator assembly (7), and the stator assembly (7) generates a rotating magnetic field so that the rotor assembly (8) drives the rotating shaft (6) to rotate synchronously; An external heat dissipation fan (12) is fixed to the outside of the rotating shaft (6) and uses the wind collecting cover (2) to guide the airflow, so that the airflow flowing outside takes away the heat dissipated from the outside of the motor housing (1); A right heat dissipation arm (4) and a left heat dissipation arm (5) which are in communication with the inner cavity of the motor housing (1) are fixedly mounted on the outer side of the motor housing (1); an inner heat dissipation fan (9) which is located inside the motor housing (1) is mounted on the outer side of the rotating shaft (6); the inner heat dissipation fan (9) realizes internal circulation of air flow inside the motor housing (1), so that the air flow in the inner cavity of the motor housing (1) passes through the right heat dissipation arm (4) and the left heat dissipation arm (5) to dissipate heat and cool down.

2. The permanent magnet synchronous motor according to claim 1, characterized in that: The surface of the inner heat dissipation fan (9) is provided with a plurality of exhaust slots (900) distributed at equal angles, and the surface of the inner heat dissipation fan (9) is fastened with an air collecting seat (10) on the outer sides of the exhaust slots (900).

3. The permanent magnet synchronous motor according to claim 2, characterized in that: The side surface of the air collecting seat (10) is in a triangular shape.

4. The permanent magnet synchronous motor according to claim 1, characterized in that: A synchronization rod (11) is fixedly mounted on the surface of the inner cooling fan (9); the synchronization rod (11) passes through the rotating shaft (6) and is connected to the outer cooling fan (12) via a bearing (122).

5. The permanent magnet synchronous motor according to claim 1, characterized in that: The input ends of the right heat dissipation arm (4) and the left heat dissipation arm (5) are relatively staggered.

6. The permanent magnet synchronous motor according to claim 5, characterized in that: A pressure limiting air valve (14) is fixedly mounted on the end of the left radiating arm (5).

7. The permanent magnet synchronous motor according to claim 2, characterized in that: A damping chamber (600) is provided in the middle of the rotating shaft (6), a piston push rod (15) is movably mounted in the damping chamber (600), a power adjustment column (16) is fixedly mounted on the end of the piston push rod (15), and a fan disk driving column (121) is threadedly connected to the end of the external heat dissipation fan (12).

8. The permanent magnet synchronous motor according to claim 7, characterized in that: A limiting seat (13) located in the inner cavity of the wind collecting cover (2) is fixedly mounted on the end of the rotating shaft (6).

9. The permanent magnet synchronous motor according to claim 8, characterized in that: A spring (150) is fixedly installed between the piston push rod (15) and the rotating shaft (6); an air return passage (601) is provided in the rotating shaft (6) and is located at the left end of the damping chamber (600); the opening of the air return passage (601) is located at the right end of the internal cooling fan (9); a speed reduction damping hole (602) is provided in the rotating shaft (6) and is located near the stator assembly (7) and the rotor assembly (8).

10. The permanent magnet synchronous motor according to claim 9, characterized in that: A one-way air valve (603) is fixed in the middle of the rotating shaft (6).

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