Low-cost high-efficiency permanent magnet synchronous motor
By adjusting the airflow interception amount through the guide shell and regulating ring structure, combined with the reverse rotation of the emergency stop fan, the problem of insufficient heat dissipation and shutdown inertia of the self-cooled permanent magnet synchronous motor is solved, achieving efficient heat dissipation and rapid shutdown, and reducing the overall temperature and operating cost of the motor.
Patent Information
- Application Number
- CN202511576765.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-01-09
AI Technical Summary
Existing self-cooled permanent magnet synchronous motors have excessive cooling capacity at low loads but insufficient cooling capacity at high loads. Their heat dissipation structure is simple and cannot be adaptively adjusted. Furthermore, they have large inertia when stopped, which affects work efficiency.
The system employs a guide shell and regulating ring structure, which adjusts the airflow interception to regulate the cooling fan's power. Combined with the emergency stop fan's reverse rotation, this reduces rotor shaft downtime and improves heat dissipation efficiency.
Without adding extra power or equipment, the heat dissipation efficiency and shutdown speed of the electric motor are improved, costs are reduced, and the overall operating efficiency of the electric motor is enhanced.
Smart Images
Figure CN121308441A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electric motors, in particular to a low-cost high-efficiency permanent magnet synchronous motor. BACKGROUND
[0002] A permanent magnet motor is an electric motor that uses permanent magnets (usually high-strength rare-earth magnets such as neodymium iron boron) to generate the excitation magnetic field. The main difference between it and the traditional electrically excited motor (such as induction motor) is that it does not need to draw current from the power grid to generate a magnetic field, thereby achieving higher efficiency and power density.
[0003] Permanent magnet synchronous motors are widely used due to their high efficiency and power density. Among them, self-cooled permanent magnet synchronous motors directly drive built-in cooling fans through the rotor shaft to generate cooling air flow, without the need for external cooling devices, and have the advantages of simple structure and low cost.
[0004] The existing self-cooled motor still has the following obvious defects: ① Fixed and insufficient cooling efficiency: the cooling air volume and air duct are usually fixed. When the motor is under low load, the cooling capacity is excessive; while under high load or long time running, the fixed cooling capacity is insufficient, and cannot be self-adaptively adjusted according to the actual temperature of the motor. This will cause the accumulation of heat in the motor, not only affecting the performance, but also increasing the risk of irreversible demagnetization of the permanent magnet due to overheating, and shortening the service life of the motor. ② Single heat dissipation structure: the existing design mainly relies on the circulation of air flow in the motor to dissipate heat, and the utilization of the motor shell, which is the main heat dissipation surface, is insufficient. There is a lack of effective means to guide and strengthen the air flow on the surface of the motor shell, limiting its overall heat dissipation potential. ③ Large inertia at shutdown, affecting work efficiency: due to the inertia of the rotor and the load, the motor needs a long time to completely stop rotating after power-off. This will seriously affect the work efficiency in application scenarios that require frequent start-stop or rapid positioning (such as some automation equipment).
[0005] In the field, how to effectively improve the heat dissipation efficiency while maintaining low cost, and quickly brake when the motor is stopped, is an important research direction for motor heat dissipation. SUMMARY
[0006] To solve the above problems in the prior art, the present application provides a low-cost high-efficiency permanent magnet synchronous motor, which has the advantages of efficient heat dissipation.
[0007] In order to achieve the above object, the present application provides the following technical scheme: comprising a motor housing, and a fan shell and a flow guide shell installed at one end of the motor housing, a rotating and penetrating rotor shaft is arranged in the motor housing, a heat dissipation fan is fixedly installed at one end of the rotor shaft close to the fan shell, the fan shell is detachably installed on one side end surface of the motor housing, and the flow guide shell is sleeved on the outer peripheral side of the fan shell; The flow guide shell is slidably arranged on the fan shell, one side end surface of the flow guide shell away from the motor housing is an arc-shaped inclined surface, an adjusting ring is movably connected on the arc-shaped inclined surface, the adjusting ring is consistent in shape with the arc-shaped inclined surface, and one end of the flow guide shell close to the motor housing extends inward.
[0008] Preferably, the end of the arc-shaped inclined surface of the flow guide shell is also obliquely fixed with at least two trapping plates, the trapping plates are attached to one side end surface of the fan shell, the adjusting ring slides on the trapping plates, and at least two adjusting plates are fixed on the adjusting ring.
[0009] Preferably, the adjusting plates are consistent in number and shape with the trapping plates, and after the two are alternately combined, a complete annular structure is formed.
[0010] Preferably, an emergency stop fan is rotatably installed on the outer peripheral side of the fan shell, a supporting ring is also fixedly installed on the outer peripheral side of the fan shell, the supporting ring is used for supporting and blocking the flow guide shell, that is, the flow guide shell slides on the supporting ring, and the inwardly extending part of the flow guide shell is limited by the supporting ring.
[0011] Preferably, a plurality of air outlets are formed in one side end surface of the fan shell, the end surface of the air outlet is inclined inwardly and consistent with the flow guide shell, two symmetrical outward grooves are formed in the inner end surface of the fan shell, and the outward grooves are located at the emergency stop fan.
[0012] Preferably, the inclination angle of the fan blades on the emergency stop fan is opposite to the inclination angle of the fan blades on the heat dissipation fan.
[0013] Preferably, an emergency stop working disc and an emergency stop rotating ring are movably arranged in the fan shell, the emergency stop rotating ring is attached to the inner wall of the fan shell through a bearing, and the emergency stop working disc is located at the center of the fan shell and is fixedly connected with the emergency stop rotating ring through a stop lever.
[0014] Preferably, an emergency stop pin is movably arranged in the emergency stop working disc, and the emergency stop pin is fixedly installed on the rotor shaft.
[0015] Preferably, the stop lever is provided with two, and symmetrically installed, the stop lever part extends to the fan shell, the stop lever inside is further provided with a first sliding rod, an electromagnet and a second sliding rod, wherein the electromagnet is fixedly installed in the stop lever, and is electrically connected with the external motor, the first sliding rod and the second sliding rod are provided with springs, and the ends of the two are further provided with friction blocks, wherein the part of the first sliding rod is located in the fan shell, and the part of the second sliding rod is located in the emergency stop working disc.
[0016] Preferably, the motor shell is further provided with a permanent magnet and a rotor inside, the rotor is located on the rotor shaft to provide power for the rotation of the rotor shaft, the motor shell is provided with a controller, and the controller is electrically connected with the outside through wires, and the outer periphery of the motor shell is provided with a plurality of heat dissipation ribs for dissipating heat of the permanent magnet parts inside the motor shell.
[0017] Compared with the prior art, the low-cost high-efficiency permanent magnet synchronous motor has the following beneficial effects: 1. The low-cost high-efficiency permanent magnet synchronous motor, by cooperation of the intercepting plate on the flow guide shell and the adjusting plate on the adjusting ring, intercepts the airflow generated by the heat dissipation fan, and by adjusting the position of the adjusting plate, the intercepting amount of the airflow can be adjusted, different wind forces are provided for the emergency stop fan, different rotating speeds of the emergency stop fan are generated, the airflow flow speed on the surface of the motor shell is increased by increasing the air volume, thereby the overall cooling efficiency of the motor is improved without increasing additional power and equipment, and the overall temperature of the motor is reduced by only changing the structure, so that the cost can be greatly reduced.
[0018] 2. The low-cost high-efficiency permanent magnet synchronous motor, by the intercepted airflow, the emergency stop fan generates rotation opposite to the rotor shaft, the pressure generated by the emergency stop fan acts on the rotor shaft, the rotating time of the rotor shaft after the motor stops is further reduced, the rotor shaft generates the emergency stop effect by cooperation of the load of the rotor shaft itself, the user can quickly operate the load on the stopped motor, and the working efficiency of the motor is greatly increased. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a three-dimensional structure schematic diagram of the application; Figure 2 It is a half-cut structure schematic diagram of the application; Figure 3 It is an enlarged structure schematic diagram of A in the application; Figure 2 Figure 4 It is a fan shell and flow guide shell structure schematic diagram of the application; Figure 5 It is a flow guide shell structure schematic diagram of the application; Figure 6 Schematic diagram of emergency stop structure of the present application; Figure 7 Schematic diagram of explosion structure of the present application Figure 6 Schematic diagram of enlarged structure at B in the present application Figure 8 Schematic diagram of fan shell structure of the present application Figure 9 Schematic diagram of emergency stop fan structure of the present application Figure 10 Schematic diagram of explosion structure of the present application
[0020] In the figure: 10, motor housing; 101, heat dissipation rib; 11, rotor shaft; 12, controller; 13, heat dissipation fan; 20, fan shell; 201, air outlet; 202, outward groove; 21, emergency stop fan; 22, support ring; 30, flow guide shell; 301, trapping plate; 31, adjusting ring; 311, adjusting plate; 40, emergency stop working disc; 41, stop lever; 411, first sliding rod; 412, electromagnet; 413, second sliding rod; 42, emergency stop pin; 43, emergency stop rotating ring. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0022] As Figures 1-10As shown, including the motor housing 10, and installed in the motor housing 10 one end fan housing 20 and guide shell 30, motor housing 10 is provided with rotating and penetrating rotor shaft 11, rotor shaft 11 near the fan housing 20 one end fixedly installed with cooling fan 13, after the motor starts will be driven by the rotor shaft 11 cooling fan 13 rotation, cooling fan 13 rotation can make the airflow inside the rotor shaft 11 flow, accelerate the cooling effect of the motor inside, that is, when the motor is on, its cooling fan 13 also starts, at this time will blow outside, the air inlet is located in the bottom of the motor housing 10 shell (not shown in the figure), between the plurality of heat dissipation ribs 101, this structure is the prior art, belongs to the self cooling system motor, because the motor speed is fast, and the speed change is complex, so the cooling fan 13 needs to resist the tensile stress generated by centrifugal force, prevent deformation or fracture, also need to withstand thousands of times of start and stop and the cycle stress brought by speed change, prevent fatigue fracture, so it needs high strength and high fatigue strength material, usually use engineering plastics, its quality is light, high strength, good fatigue resistance, also resistant to heat and corrosion, and easy to manufacture, preferably for reinforced nylon (PA) and polyether ether ketone (PEEK), the motor housing 10 is also provided with permanent magnet and rotor, the rotor is located on the rotor shaft 11, which provides power for the rotation of the rotor shaft 11, the motor housing 10 is provided with controller 12, which is electrically connected with the outside through wires, the outer periphery of the motor housing 10 is provided with a plurality of heat dissipation ribs 101, which is used for cooling the permanent magnet parts inside the motor housing 10, to avoid the overheating of the permanent magnet after long time use of the motor, reduce its magnetism, cause the power of the motor to drop, the fan housing 20 is detachably installed on one side of the motor housing 10, the guide shell 30 is sleeved on the outer periphery of the fan housing 20, wherein the guide shell 30 and the fan housing 20 have a certain friction force, and will not easily slide under the action of external force, when the cooling fan 13 blows, it will blow the guide shell 30 to slide, open the channel in the guide shell 30, intercept part of the airflow through the guide of the guide shell 30, flow to the outer surface of the motor housing 10, accelerate the air flow of the outer surface of the motor housing 10, thereby accelerating the heat dissipation of the heat dissipation ribs 101, making the heat exchange effect of the permanent magnet inside the motor housing 10 better, accelerating the cooling effect of the motor inside, the guide shell 30 and the fan housing 20 can also be connected by buckling, in normal state, consistent with other similar fans, when the cooling effect of the outer surface of the motor housing 10 needs to be accelerated, at this time, the guide shell 30 can be manually or electrically pushed to open, intercepting part of the airflow blowing to the outer surface of the motor housing 10, when it is not needed, the guide shell 30 can be buckled, which can be selected by the user according to the needs.
[0023] The outer periphery side of the fan shell 20 is rotatably installed with an emergency stop fan 21, which is in smooth fit with the fan shell 20, that is, the installation bearing can be achieved to minimize the friction between the two, when the airflow passes through the emergency stop fan 21, it will drive the emergency stop fan 21 to rotate, the rotating direction is opposite to that of the cooling fan 13, and a plurality of arc-shaped protrusions are arranged on the inner wall of the emergency stop fan 21. The outer periphery side of the fan shell 20 is fixedly installed with a supporting ring 22, which is used to support and block the flow guide shell 30, that is, the supporting ring 22 is in friction fit or buckle fit with the flow guide shell 30, and the part of the flow guide shell 30 extending inward at one end is limited by the supporting ring 22, that is, the flow guide shell 30 is blocked from falling off, that is, the flow guide shell 30 slides on the supporting ring 22, and the part of the flow guide shell 30 extending inward is limited by the supporting ring 22. A plurality of air outlets 201 are formed in the end surface of the fan shell 20, the end surface of the air outlet 201 is inclined inward, consistent with the flow guide shell 30, two symmetrical outward grooves 202 are formed in the inner end surface of the fan shell 20, the outward grooves 202 are located at the emergency stop fan 21 and penetrate the supporting ring 22, and the inclination angle of the fan blades on the emergency stop fan 21 is opposite to that of the cooling fan 13, that is, the airflow generated by the rotation of the cooling fan 13 is guided by the flow guide shell 30 to make the emergency stop fan 21 rotate in the opposite direction.
[0024] The flow guide shell 30 is slidably arranged on the fan shell 20, the end surface of the flow guide shell 30 away from the motor housing 10 is an arc-shaped inclined surface, and an adjusting ring 31 is movably connected to the arc-shaped inclined surface, the shape of the adjusting ring 31 is consistent with that of the arc-shaped inclined surface, the end of the flow guide shell 30 close to the motor housing 10 extends inward, and the arc surface portion can facilitate the airflow to be turned by 180 degrees, and then the airflow can blow to the outer surface of the motor housing 10.
[0025] The end of the arc-shaped inclined surface of the flow guide shell 30 is also obliquely fixed with at least two intercepting plates 301, which are attached to one side end surface of the fan shell 20 and just block part of the air outlet 201. When the airflow blows, the thrust provided by the part of the air outlet 201 can make the flow guide shell 30 slide, and the adjusting ring 31 slides on the intercepting plate 301. The adjusting ring 31 is fixed with at least two adjusting plates 311, which are consistent in number and shape with the intercepting plates 301, and the two are alternately combined to form a complete annular shape. The adjusting plate 311 cooperates with the intercepting plate 301 to form a complete annular shape at the air outlet 201, which can just intercept part of the airflow and flow out from the inside of the flow guide shell 30 to the motor housing 10. By adjusting the position of the adjusting plate 311, the amount of airflow interception can be adjusted to provide different wind forces for the emergency stop fan 21. Not only can the emergency stop fan 21 produce different rotating speeds, but also the airflow flowing speed on the surface of the motor housing 10 can be increased by increasing the airflow, thereby improving the overall cooling efficiency of the motor without increasing additional power and equipment. The overall temperature of the motor can be greatly reduced by only changing the structure, which can greatly reduce the cost.
[0026] The emergency stop working disc 40 is movably arranged inside the fan shell 20, and the emergency stop working disc 40 is movably arranged inside the fan shell 20. The emergency stop ring 43 is attached to the inner wall of the fan shell 20 through a bearing, the emergency stop working disc 40 is located at the center of the fan shell 20, and the emergency stop working disc 40 is fixedly connected with the emergency stop ring 43 through the stop lever 41. The emergency stop pin 42 is movably arranged inside the emergency stop working disc 40, and the emergency stop pin 42 is fixedly installed on the rotor shaft 11, so that the emergency stop pin 42 rotates synchronously with the rotor shaft 11, and the two do not produce relative rotation. The stop lever 41 is provided with two and is symmetrically installed. Part of the stop lever 41 extends into the fan shell 20, that is, into the outward groove 202. The rotation angle in the outward groove 202 is less than 180°. The stop lever 41 is further provided with a first sliding rod 411, an electromagnet 412 and a second sliding rod 413. The electromagnet 412 is fixedly installed in the stop lever 41 and is electrically connected with the external motor. The first sliding rod 411 and the second sliding rod 413 are provided with a spring therebetween. The two sliding rods are connected by the spring, and the spring penetrates the electromagnet 412. The two ends of the spring are further provided with friction blocks. The first sliding rod 411 is located in the fan shell 20, and the second sliding rod 413 is located in the emergency stop working disc 40. When the motor is started, the electromagnet 412 is also powered on, and can attract the first sliding rod 411 and the second sliding rod 413 away from the emergency stop pin 42 and the emergency stop fan 21, so that the motor can be normally used without being affected. At the same time, the emergency stop fan 21 rotates normally under the action of airflow. When the motor is stopped, the electromagnet 412 is also powered off. Under the action of the spring, the first sliding rod 411 and the second sliding rod 413 abut against the emergency stop pin 42 and the emergency stop fan 21 at the same time. At this time, the friction block on the second sliding rod 413 abuts against the emergency stop pin 42, thereby limiting the rotation of the rotor shaft 11, so that the rotor shaft 11 can be quickly stopped. At the same time, the friction block of the first sliding rod 411 abuts against the emergency stop fan 21, which generates a rotary force opposite to the rotation of the rotor shaft 11. At the same time, the arc-shaped protrusion on the emergency stop fan 21 abuts against the first sliding rod 411, so that the spring is squeezed. The squeezing force is transmitted to the second sliding rod 413, thereby increasing the pressure of the second sliding rod 413, and increasing the friction force of the friction block, thereby further reducing the rotation time of the rotor shaft 11 after the motor is stopped. In cooperation with the load of the rotor shaft 11 itself, the rotor shaft 11 generates an effect similar to emergency stop, which is convenient for users to quickly operate the load on the motor after stopping, and greatly increases the working efficiency of the motor.
[0027] Working principle: When in use, the motor is started, causing the rotor shaft 11 to drive the cooling fan 13 and the load to rotate. Then, the cooling fan 13 rotates to generate airflow, which is blown outward. After the motor has been used for a long time, it is necessary to accelerate the cooling of the motor to avoid excessive temperature from weakening the magnetism of the permanent magnet, thereby affecting the performance of the motor. At this time, it is necessary to manually or automatically open the guide shell 30, so that the guide shell 30 slides open the channel inside the guide shell 30. The intercepting plate 301 intercepts part of the airflow from the cooling fan 13. Through the guide inside the guide shell 30, this part of the airflow flows to the outer surface of the motor housing 10, thereby accelerating the heat dissipation of the heat dissipation ridges 101 on the surface of the motor housing 10. The heat dissipation ridges 101 cool the internal components of the motor housing 10 through heat exchange. Therefore, the intercepted part of the airflow can accelerate the cooling effect inside the motor housing 10.
[0028] As the temperature of the motor gradually increases, the rotatable adjusting ring 31 causes the adjusting plate 311 to block more of the air outlets 201, thereby intercepting more airflow and accelerating the airflow on the surface of the motor housing 10, thereby increasing its cooling effect and producing a highly efficient cooling effect.
[0029] When the airflow reaches the emergency stop fan 21, it drives the emergency stop fan 21 to rotate, and its rotation is opposite to that of the rotor shaft 11. At this time, when the motor stops, the electromagnet 412 is de-energized. Under the action of the spring, the first slide rod 411 and the second slide rod 413 simultaneously abut against the emergency stop pin 42 and the emergency stop fan 21. At this time, the friction block on the second slide rod 413 abuts against the emergency stop pin 42, thereby restricting the rotation of the rotor shaft 11 and enabling the rotor shaft 11 to stop quickly. At the same time, the friction block of the emergency stop fan 21 abuts against the first slide rod 411, generating a rotational force opposite to the rotation of the rotor shaft 11. Meanwhile, the arc-shaped protrusion on the emergency stop fan 21 abuts against the first slide rod 411, causing the spring to be compressed. This compression force is transmitted to the second slide rod 413, increasing the pressure of the second slide rod 413, thereby increasing the friction of the friction block, which can accelerate the stop of the rotor shaft 11. Combined with the load of the rotor shaft 11 itself, the rotor shaft 11 produces an emergency stop effect.
[0030] In summary, this low-cost, high-efficiency permanent magnet synchronous motor, through the cooperation of the interception plate 301 on the guide shell 30 and the adjustment plate 311 on the adjustment ring 31, intercepts the airflow generated by the cooling fan 13. At the same time, by adjusting the position of the adjustment plate 311, the amount of airflow interception can be adjusted, providing different airflow forces for the emergency stop fan 21. This not only causes the emergency stop fan 21 to generate different speeds, but also increases the airflow velocity on the surface of the motor housing 10 by increasing the airflow volume. Thus, without adding additional power and equipment, the overall cooling efficiency of the motor is improved. Simply by changing the structure to reduce the overall temperature of the motor, the cost can be greatly reduced. The intercepted airflow causes the emergency stop fan 21 to rotate in the opposite direction to the rotor shaft 11. The reverse force of the emergency stop fan 21 acts on the rotor shaft 11, further reducing the rotation time of the rotor shaft 11 after the motor stops. Combined with the load of the rotor shaft 11 itself, the rotor shaft 11 produces an emergency stop effect, which makes it convenient for users to quickly operate the load on the motor after it stops, greatly increasing the working efficiency of the motor.
[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A low-cost, high-efficiency permanent magnet synchronous motor, comprising a motor housing (10), and a fan housing (20) and a flow guide housing (30) mounted at one end of the motor housing (10), wherein a rotating and penetrating rotor shaft (11) is disposed inside the motor housing (10), and a cooling fan (13) is fixedly mounted at one end of the rotor shaft (11) near the fan housing (20), characterized in that: The fan housing (20) is detachably mounted on one side end face of the motor housing (10), and the flow guide shell (30) is fitted onto the outer periphery of the fan housing (20); The flow guide shell (30) is slidably disposed on the fan housing (20). The end face of the flow guide shell (30) away from the motor housing (10) is an arc-shaped inclined surface. An adjustment ring (31) is also movably connected to the arc-shaped inclined surface. The shape of the adjustment ring (31) is consistent with the arc-shaped inclined surface. The end of the flow guide shell (30) near the motor housing (10) extends inward.
2. The low-cost, high-efficiency permanent magnet synchronous motor according to claim 1, characterized in that: At least two intercepting plates (301) are also fixed at the end of the arc-shaped inclined surface of the flow guide shell (30). The intercepting plate (301) is attached to one side end face of the fan shell (20). The adjusting ring (31) slides on the intercepting plate (301). At least two adjusting plates (311) are fixed on the adjusting ring (31).
3. The low-cost, high-efficiency permanent magnet synchronous motor according to claim 2, characterized in that: The number and shape of the adjusting plate (311) and the intercepting plate (301) are the same, and the two are alternately combined to form a complete ring.
4. The low-cost, high-efficiency permanent magnet synchronous motor according to claim 1, characterized in that: An emergency stop fan (21) is rotatably mounted on the outer periphery of the fan housing (20). A support ring (22) is also fixedly mounted on the outer periphery of the fan housing (20). The support ring (22) is used to support and block the flow guide shell (30). That is, the flow guide shell (30) slides on the support ring (22), and the inwardly extending part of the flow guide shell (30) is limited by the support ring (22).
5. A low-cost, high-efficiency permanent magnet synchronous motor according to claim 4, characterized in that: The fan housing (20) has several air outlets (201) on one side end face. The end face of the air outlets (201) is inclined inward and consistent with the guide shell (30). The fan housing (20) has two symmetrical outward grooves (202) on the inner end face. The outward grooves (202) are located at the emergency stop fan (21).
6. A low-cost, high-efficiency permanent magnet synchronous motor according to claim 4, characterized in that: The tilt angle of the blades on the emergency stop fan (21) is opposite to that of the blades on the cooling fan (13).
7. A low-cost, high-efficiency permanent magnet synchronous motor according to claim 1, characterized in that: An emergency stop working plate (40) and an emergency stop rotating ring (43) are movably arranged inside the fan housing (20). The emergency stop rotating ring (43) is attached to the inner wall of the fan housing (20) by a bearing. The emergency stop working plate (40) is located at the center of the fan housing (20) and is fixedly connected to the emergency stop rotating ring (43) by a stop bar (41).
8. A low-cost, high-efficiency permanent magnet synchronous motor according to claim 7, characterized in that: An emergency stop pin (42) is movably provided inside the emergency stop working plate (40), and the emergency stop pin (42) is fixedly installed on the rotor shaft (11).
9. A low-cost, high-efficiency permanent magnet synchronous motor according to claim 7, characterized in that: Two baffles (41) are provided and installed symmetrically. Part of the baffle (41) extends into the fan housing (20). The baffle (41) is also provided with a first slide rod (411), an electromagnet (412) and a second slide rod (413). The electromagnet (412) is fixedly installed in the baffle (41) and electrically connected to an external motor. A spring is provided between the first slide rod (411) and the second slide rod (413), and friction blocks are provided at the ends of both. Part of the first slide rod (411) is located inside the fan housing (20), and part of the second slide rod (413) is located inside the emergency stop working plate (40).
10. A low-cost, high-efficiency permanent magnet synchronous motor according to claim 1, characterized in that: The motor housing (10) is also equipped with a permanent magnet and a rotor. The rotor is located on the rotor shaft (11) and provides power for the rotation of the rotor shaft (11). The motor housing (10) is equipped with a controller (12) which is electrically connected to the outside through wires. The outer periphery of the motor housing (10) is equipped with several heat dissipation ridges (101) for heat dissipation of the permanent magnet components inside the motor housing (10).