Permanent magnet synchronous motor with anti-demagnetization function

Abstract

The application relates to the technical field of motor equipment, and discloses a permanent magnet synchronous motor with a demagnetization prevention function, which comprises a stator-rotor part, a motor shell part, an external circulation radiator and a heat dissipation circulation driving unit. The circumferential cooling flow channel of the water-cooled shell assembly covers the outer periphery of the stator, the end cooling pipeline in the rear end cooling end cover covers the rear end area of the motor, cold air is introduced into the motor through the fan blades, a circumferential and internal cooling structure is formed, a heat dissipation blind area is eliminated, irreversible demagnetization of the permanent magnet caused by local overheating is avoided, the heat dissipation circulation driving unit relies on the self-rotation power of the motor rotating shaft, the cooling circulation pump and the heat dissipation fan blade are synchronously driven through a belt transmission structure to rotate, an additional power motor does not need to be configured for the heat dissipation system, the additional energy consumption of the heat dissipation system is greatly reduced, the overall machine energy efficiency level is significantly improved, and the energy-saving and consumption-reducing concept of the high-efficiency and energy-saving industry is met.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, specifically to a permanent magnet synchronous motor with anti-demagnetization function. Background Technology

[0002] With the continuous advancement of the energy-efficient industry, energy-saving electric motors, thanks to their excellent energy efficiency, have become core components for reducing energy consumption in industrial production and equipment manufacturing. Permanent magnet synchronous motors, as a typical representative of energy-saving electric motors, have advantages such as high power density, high operating efficiency, and good speed regulation performance, making them a key power product promoted by the energy-efficient industry.

[0003] However, existing permanent magnet synchronous motors have significant shortcomings in high-load continuous operation scenarios: First, permanent magnets are highly sensitive to temperature. When the internal temperature of the motor is too high, the permanent magnets are prone to irreversible demagnetization, resulting in a decrease in motor output torque and energy efficiency, directly reducing the operating efficiency of energy-saving motors. Second, conventional liquid cooling solutions only set circumferential cooling channels in the motor housing, which can only cover the outer periphery of the stator. The heat at the rotor end and end cover area is difficult to dissipate, resulting in uneven temperature distribution inside the motor. The permanent magnets are prone to local overheating and demagnetization, and the heat dissipation coverage is insufficient. Third, the circulating pumps and cooling fans of existing heat dissipation systems mostly adopt independent drive structures, requiring additional power sources, which increases the overall energy consumption of the system and is inconsistent with the energy-saving goals of the high-efficiency energy-saving industry.

[0004] Therefore, developing a permanent magnet synchronous motor that combines anti-demagnetization capability with low energy consumption is an urgent need for the technological upgrading of energy-saving motors in the current high-efficiency energy-saving industry. Summary of the Invention

[0005] The purpose of this invention is to provide a permanent magnet synchronous motor with anti-demagnetization function to solve the problems mentioned in the background art, such as incomplete heat dissipation coverage, easy local demagnetization of permanent magnets, and high additional energy consumption of heat dissipation system in existing permanent magnet synchronous motors.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a permanent magnet synchronous motor with anti-demagnetization function, comprising a stator and rotor section and a motor housing section. The stator and rotor section includes a stator assembly, a rotor assembly, and a motor shaft. The stator assembly is disposed on the inner wall of the motor housing section. The rotor assembly is fixedly mounted on the motor shaft. The motor shaft is supported by the motor housing section and extends outward at its rear end. The motor housing section includes a water-cooled outer shell assembly, a rear cooling end cover, and mounting feet. The rear cooling end cover is fixedly disposed at the rear end of the water-cooled outer shell assembly, and the mounting feet are fixedly disposed at the lower end of the water-cooled outer shell assembly.

[0007] One side of the motor housing is also provided with an external circulation radiator and a heat dissipation circulation drive unit. The transmission component of the heat dissipation circulation drive unit is connected to the extended end of the motor shaft, and synchronously drives the liquid cooling circulation and air cooling of the external circulation radiator as the motor shaft rotates.

[0008] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the water-cooled outer casing assembly includes an outer casing, a rear sealing ring, a casing coolant inlet, a casing coolant outlet, a threaded hole block, a cooling inner casing, a cooling channel, and a front sealing ring.

[0009] The cooling inner unit housing is coaxially disposed inside the outer unit housing, the rear sealing ring is fixedly welded to the rear opening of the outer unit housing, and a cooling flow channel is provided on the outer side of the cooling inner unit housing;

[0010] The coolant inlet and coolant outlet of the housing are both fixedly installed on the outer wall of the outer housing and are respectively connected to both ends of the cooling channel. Several threaded hole blocks are fixed circumferentially to the front end of the outer housing for connecting and fixing the front end sealing ring.

[0011] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the cooling channel is a continuous channel that extends axially along the outer wall of the cooling inner casing.

[0012] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the rear cooling end cover includes an end cover ring, an end cover reinforcing rib, a bearing seat, an end cooling pipe, an end cover liquid cooling inlet, and an end cover liquid cooling outlet.

[0013] The bearing housing is coaxially disposed in the central region of the end cap ring. Several end cap reinforcing ribs are radially and evenly connected between the outer peripheral wall of the bearing housing and the inner peripheral wall of the end cap ring to form a support skeleton for the end cap. The end cap ring is fixed to the rear end of the water-cooled outer shell assembly.

[0014] The end cooling pipe is embedded inside the end cap ring and the end cap reinforcing rib. The end cap liquid cooling inlet and the end cap liquid cooling outlet are both fixedly installed on the outer wall of the end cap ring and are respectively connected to the beginning and end ends of the end cooling pipe.

[0015] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the external circulation radiator includes a radiator core, a liquid replenishment port, a liquid return pipe, a liquid outlet pipe, and a radiator mounting bracket.

[0016] The radiator mounting bracket is fixedly connected to the side frame of the radiator core and is used to fix the external circulation radiator as a whole onto the heat dissipation circulation drive unit. The liquid replenishment port is fixedly set on the top of the radiator core and is connected to the heat exchange channel inside the radiator core. It is used to replenish coolant into the loop. The return pipe and the outlet pipe are respectively connected to the inlet and outlet of the radiator core and are used to connect to the coolant circulation loop to realize the function of high temperature coolant flowing in for heat dissipation and cooling and then flowing out for supply.

[0017] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the heat sink core is a finned tube type.

[0018] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the heat dissipation circulation drive unit includes a unit mounting frame, a transmission shaft seat, a driven pulley, a transmission belt, cooling fan blades, a cooling circulation pump, and a liquid supply pipeline.

[0019] One side of the unit mounting frame is fixedly connected to the outer wall of the water-cooled housing assembly, serving as the mounting and bearing base for the entire unit. The drive shaft seat is fixedly mounted on the middle frame of the unit mounting frame. The driven pulley is fixed on the drive shaft of the drive shaft seat. The drive belt is tensioned and fitted between the driven pulley and the extended end of the motor shaft, forming a belt drive pair to synchronously transmit the rotational power of the motor shaft.

[0020] The cooling fan blades are fixed to one end of the drive shaft of the drive shaft seat, rotate synchronously with the driven pulley and are positioned facing the external circulation radiator to output forced air cooling airflow. The cooling circulation pump is fixedly installed on the other side of the unit mounting frame, and its power input shaft is coaxially connected to the other end of the drive shaft of the drive shaft seat. The liquid supply pipeline is connected to the liquid outlet of the cooling circulation pump to deliver pressurized coolant to the water-cooled outer shell assembly and the rear cooling end cover.

[0021] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the stator and rotor section further includes an output end cover, fan blades, an end cover air outlet, and a shaft end pulley.

[0022] The output end cap is sealed and fixed to the front opening of the motor housing. The front end of the motor shaft passes through the center of the output end cap and extends outward to form the output end. Multiple sets of air outlets are opened on the output end cap. The fan blades are fixedly installed at both ends of the rotor assembly. As the rotor assembly rotates, airflow is generated and discharged through the air outlets of the end cap. The pulley at the end of the shaft is fixedly sleeved on the rear end of the motor shaft to transmit rotational power outward.

[0023] As a preferred embodiment of the permanent magnet synchronous motor with anti-demagnetization function described in this invention, the stator assembly is coaxially arranged around the outside of the rotor assembly, with a working gap between them, and the outer wall of the stator assembly is fixedly fitted to the inner wall of the motor housing.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention covers the outer periphery of the stator with a circumferential cooling channel of a water-cooled outer shell assembly, and covers the rear end area of ​​the motor with an end cooling pipe inside the rear cooling end cover. Cool air is introduced into the motor through fan blades, forming a circumferential and internal cooling structure, eliminating heat dissipation blind spots, avoiding irreversible demagnetization of permanent magnets due to local overheating, ensuring the performance stability of energy-saving motors, extending the service life of motors, and ensuring the long-term reliable operation of high-efficiency energy-saving industrial equipment.

[0026] 2. The heat dissipation circulation drive unit of the present invention relies on the self-rotation power of the motor shaft to synchronously drive the cooling circulation pump and the cooling fan blades through the belt drive structure. There is no need to configure an additional power motor for the heat dissipation system, which greatly reduces the additional energy consumption of the heat dissipation system and significantly improves the overall energy efficiency level, which is in line with the energy-saving and consumption-reducing concept of the high-efficiency energy-saving industry.

[0027] 3. This invention adopts an external circulation radiator combined with forced air cooling. After the cooling circulation pump drives the coolant to remove the heat inside the motor, the high-temperature coolant flows into the radiator core. The cooling fan blades simultaneously force airflow into the radiator core, quickly reducing the coolant temperature and improving the heat exchange efficiency of the liquid cooling circuit. This allows the motor to quickly maintain a stable operating temperature under high load conditions, further enhancing the anti-demagnetization effect and ensuring the high-efficiency output of the energy-saving motor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall second-view structure of the present invention;

[0030] Figure 3 This is an overall side view of the present invention;

[0031] Figure 4 This is a schematic diagram of the motor housing structure of the present invention;

[0032] Figure 5 This is an exploded structural diagram of the stator and rotor section and the motor housing section of the present invention;

[0033] Figure 6 This is an exploded structural diagram of the motor housing of the present invention;

[0034] Figure 7 This is a schematic diagram of the internal structure of the motor housing of the present invention;

[0035] Figure 8 This is a schematic diagram of a partial cross-sectional structure of the motor housing of the present invention;

[0036] Figure 9 for Figure 8 Enlarged view of point A in the middle;

[0037] Figure 10 for Figure 8 Enlarged view at point B in the middle;

[0038] Figure 11 This is a schematic diagram of the external circulation heat sink and the heat dissipation circulation drive unit of the present invention.

[0039] The attached diagram lists the components represented by each number as follows:

[0040] 100. Stator and rotor section; 110. Stator assembly; 120. Rotor assembly; 130. Motor shaft; 140. Output end cover; 150. Fan blades; 160. End cover air outlet; 170. Shaft end pulley;

[0041] 200. Motor housing; 210. Water-cooled outer casing assembly; 211. Outer casing; 212. Rear end sealing ring; 213. Housing coolant inlet; 214. Housing coolant outlet; 215. Threaded hole block; 216. Cooling inner casing; 217. Cooling channel; 218. Front end sealing ring; 220. Rear end cooling end cap; 221. End cap ring; 222. End cap reinforcing rib; 223. Bearing housing; 224. End cooling pipe; 225. End cap liquid cooling inlet; 226. End cap liquid cooling outlet; 230. Mounting feet;

[0042] 300. External circulation radiator; 310. Radiator core; 320. Fluid replenishment port; 330. Return pipe; 340. Discharge pipe; 350. Radiator mounting bracket;

[0043] 400, Cooling circulation drive unit; 410, Unit mounting frame; 420, Drive shaft seat; 430, Driven pulley; 440, Drive belt; 450, Cooling fan blades; 460, Cooling circulation pump; 470, Liquid supply pipeline. Detailed Implementation

[0044] 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. 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.

[0045] This invention provides a technical solution: such as Figure 1 - Figure 11 The permanent magnet synchronous motor shown includes a stator and rotor section 100 and a motor housing section 200. The stator and rotor section 100 includes a stator assembly 110, a rotor assembly 120, and a motor shaft 130. The stator assembly 110 is disposed on the inner wall of the motor housing section 200. The rotor assembly 120 is fixedly mounted on the motor shaft 130. The motor shaft 130 is supported on the motor housing section 200 and extends outward at its rear end. The motor housing section 200 includes a water-cooled housing assembly 210, a rear cooling end cover 220, and a mounting foot 230. The rear cooling end cover 220 is fixedly disposed at the rear end of the water-cooled housing assembly 210, and the mounting foot 230 is fixedly disposed at the lower end of the water-cooled housing assembly 210.

[0046] On one side of the motor housing 200, there is also an external circulation radiator 300 and a heat dissipation circulation drive unit 400. The transmission component of the heat dissipation circulation drive unit 400 is connected to the extended end of the motor shaft 130, and drives the liquid cooling circulation and the external circulation radiator 300 for air cooling as the motor shaft 130 rotates.

[0047] In some embodiments of the present invention, reference is made to... Figure 4 - Figure 10 As shown, the water-cooled outer casing assembly 210 includes an outer casing 211, a rear sealing ring 212, a casing coolant inlet 213, a casing coolant outlet 214, a threaded hole block 215, a cooling inner casing 216, a cooling channel 217, and a front sealing ring 218.

[0048] The cooling inner unit housing 216 is coaxially disposed inside the outer unit housing 211, and the rear sealing ring 212 is fixedly welded to the rear opening of the outer unit housing 211. A cooling flow channel 217 is provided on the outer side of the cooling inner unit housing 216.

[0049] The coolant inlet 213 and coolant outlet 214 are both fixedly installed on the outer wall of the outer casing 211 and are connected to both ends of the cooling channel 217 respectively. Several threaded hole blocks 215 are fixed circumferentially to the front end of the outer casing 211 for connecting and fixing the front sealing ring 218.

[0050] Preferably, the cooling channel 217 is a continuous channel that extends axially along the outer wall of the cooling housing 216.

[0051] In some embodiments of the present invention, reference is made to... Figure 4 - Figure 10 As shown, the rear cooling end cap 220 includes an end cap ring 221, an end cap reinforcing rib 222, a bearing seat 223, an end cooling pipe 224, an end cap liquid cooling inlet 225, and an end cap liquid cooling outlet 226.

[0052] The bearing housing 223 is coaxially disposed in the central area of ​​the end cover ring 221. Several end cover reinforcing ribs 222 are radially and evenly connected between the outer peripheral wall of the bearing housing 223 and the inner peripheral wall of the end cover ring 221 to form the support skeleton of the end cover. The end cover ring 221 is fixed to the rear end of the water-cooled outer shell assembly 210.

[0053] The end cooling pipe 224 is embedded inside the end cap ring 221 and the end cap reinforcing rib 222. The end cap liquid cooling inlet 225 and the end cap liquid cooling outlet 226 are both fixedly installed on the outer wall of the end cap ring 221 and are respectively connected to the beginning and end ends of the end cooling pipe 224.

[0054] In some embodiments of the present invention, reference is made to... Figure 1 - Figure 3 and Figure 11 As shown, the external circulation radiator 300 includes a radiator core 310, a liquid filling port 320, a liquid return pipe 330, a liquid outlet pipe 340, and a radiator mounting bracket 350.

[0055] The radiator mounting bracket 350 is fixedly connected to the side frame of the radiator core 310 and is used to fix the external circulation radiator 300 as a whole on the heat dissipation circulation drive unit 400. The liquid filling port 320 is fixedly set on the top of the radiator core 310 and is connected to the heat exchange channel inside the radiator core 310. It is used to replenish the coolant in the loop. The return pipe 330 and the outlet pipe 340 are respectively connected to the inlet end and outlet end of the radiator core 310 and are used to connect to the coolant circulation loop to realize the function of high temperature coolant flowing in for heat dissipation and coolant flowing out for supply after cooling.

[0056] Preferably, the radiator core 310 is a finned tube type.

[0057] In some embodiments of the present invention, reference is made to... Figure 1 - Figure 3 and Figure 11 As shown, the heat dissipation circulation drive unit 400 includes a unit mounting frame 410, a drive shaft seat 420, a driven pulley 430, a drive belt 440, a heat dissipation fan blade 450, a cooling circulation pump 460, and a liquid supply pipeline 470.

[0058] One side of the unit mounting frame 410 is fixedly connected to the outer wall of the water-cooled housing assembly 210, serving as the mounting and bearing base for the entire unit. The drive shaft seat 420 is fixedly mounted on the middle frame of the unit mounting frame 410. The driven pulley 430 is fixed on the drive shaft of the drive shaft seat 420. The drive belt 440 is tensioned and fitted between the driven pulley 430 and the extended end of the motor shaft 130, forming a belt drive pair to synchronously transmit the rotational power of the motor shaft 130.

[0059] The cooling fan blades 450 are fixed to one end of the drive shaft of the drive shaft seat 420, rotate synchronously with the driven pulley 430 and are positioned facing the external circulating radiator 300 to output forced air cooling airflow. The cooling circulation pump 460 is fixedly installed on the other side of the unit mounting frame 410, and its power input shaft is coaxially connected to the other end of the drive shaft of the drive shaft seat 420. The liquid supply line 470 is connected to the outlet end of the cooling circulation pump 460 to deliver the pressurized coolant to the water-cooled outer shell assembly 210 and the rear cooling end cover 220.

[0060] The heat dissipation circulation drive unit 400 of the present invention relies on the rotational power of the motor shaft 130 to synchronously drive the cooling circulation pump 460 and the cooling fan blades 450 through the belt drive structure. It eliminates the need for an additional power motor for the heat dissipation system, greatly reduces the additional energy consumption of the heat dissipation system, significantly improves the overall energy efficiency level, and fully conforms to the energy conservation and consumption reduction concept of the high-efficiency energy-saving industry.

[0061] In some embodiments of the present invention, reference is made to... Figure 5 and Figure 7 - Figure 8 As shown, the stator and rotor section 100 also includes an output end cover 140, fan blades 150, an end cover air outlet 160, and a shaft end pulley 170.

[0062] The output end cover 140 is sealed and fixed at the front opening of the motor housing 200. The front end of the motor shaft 130 passes through the center of the output end cover 140 and extends outward to form the output end. Multiple sets of end cover air outlets 160 are opened on the output end cover 140. The fan blades 150 are fixedly set at both ends of the rotor assembly 120. They generate airflow as the rotor assembly 120 rotates and are discharged through the end cover air outlets 160. The shaft end pulley 170 is fixedly sleeved on the rear end of the motor shaft 130 and is used to transmit rotational power outward.

[0063] Furthermore, the stator assembly 110 is coaxially arranged around the outside of the rotor assembly 120, with a working gap between them, and the outer wall of the stator assembly 110 is fixedly attached to the inner wall of the motor housing 200.

[0064] This invention uses the circumferential cooling channel 217 of the water-cooled outer shell assembly 210 to cover the outer periphery of the stator, and the end cooling pipe 224 inside the rear cooling end cover 220 to cover the rear end area of ​​the motor. The fan blades 150 introduce cold air into the motor, forming a circumferential and internal cooling structure, eliminating heat dissipation blind spots, avoiding irreversible demagnetization of permanent magnets due to local overheating, ensuring the performance stability of the energy-saving motor, extending the service life of the motor, and ensuring the long-term reliable operation of high-efficiency energy-saving industrial equipment.

[0065] Working principle:

[0066] When the stator assembly 110 is powered on, it generates a rotating magnetic field, which drives the rotor assembly 120 to rotate synchronously with the motor shaft 130 and output power to the outside. During this process, the stator winding and the rotor permanent magnet continuously generate heat, and the internal temperature of the motor gradually increases.

[0067] As the motor shaft 130 rotates, it drives the pulley 170 at the end of the shaft to rotate synchronously. Through the transmission belt 440, it drives the driven pulley 430 and the transmission shaft seat 420 to rotate, which in turn drives the cooling fan blades 450 and the cooling circulation pump 460 to operate synchronously. The cooling system works synchronously with the motor start-up and requires no additional control.

[0068] The cooling circulation pump 460 generates pumping pressure, which sends the coolant cooled by the radiator core 310 through the liquid supply pipe 470 into the housing coolant inlet 213 and the end cover liquid cooling inlet 225. After entering the spiral cooling channel 217, the coolant flows spirally along the axis, fully absorbing the heat conducted by the stator assembly 110. At the same time, the coolant flows into the end cooling pipe 224, which absorbs the structural heat in the rear area of ​​the motor and eliminates the end heat dissipation blind spot. On the other hand, it forms a stable low temperature cold source inside the end cover, providing a basis for heat exchange and cooling for the internal air-cooled airflow. The high-temperature coolant after absorbing heat flows out from the housing coolant outlet 214 and the end cover liquid cooling outlet 226, respectively, and flows back to the radiator core 310 through the return pipe 330.

[0069] When the high-temperature coolant flows through the internal flow channel of the radiator core 310, the forced airflow generated by the cooling fan blades 450 blows laterally across the fin surface of the radiator core 310, quickly carrying away the heat in the coolant and causing the coolant temperature to drop significantly. The cooled coolant then flows into the cooling circulation pump 460 through the outlet pipe 340, completing one external circulation.

[0070] When the rotor assembly 120 rotates, the fan blades 150 at both ends rotate synchronously and form axial air pressure, drawing air from the rear end of the motor into the inner cavity. When the air flows through the rear cooling end cover 220, it fully contacts and exchanges heat with the outer wall of the end cooling pipe 224. It is cooled by the low-temperature coolant in the pipe and becomes cold air. The cold air flows forward along the axial direction of the motor inner cavity, continuously sweeping across the surfaces of the stator assembly 110 and the rotor assembly 120, carrying away the working heat of the permanent magnet and winding. Finally, the air carrying heat is discharged from the end cover outlet 160 of the output end cover 140. With the help of the liquid cooling source, the cooling effect of the internal air cooling is greatly improved, the internal temperature of the motor is further balanced, and the anti-demagnetization capability of the permanent magnet is strengthened.

[0071] 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.

[0072] 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 permanent magnet synchronous motor with anti-demagnetization function, comprising a stator and rotor section (100) and a motor housing section (200), wherein the stator and rotor section (100) includes a stator assembly (110), a rotor assembly (120), and a motor shaft (130), the stator assembly (110) is disposed on the inner wall of the motor housing section (200), the rotor assembly (120) is fixedly mounted on the motor shaft (130), the motor shaft (130) is supported on the motor housing section (200) and extends outward at its rear end, characterized in that: The motor housing (200) includes a water-cooled housing assembly (210), a rear cooling end cover (220), and a mounting foot (230). The rear cooling end cover (220) is fixedly disposed at the rear end of the water-cooled housing assembly (210), and the mounting foot (230) is fixedly disposed at the lower end of the water-cooled housing assembly (210). The motor housing (200) is also provided with an external circulation radiator (300) and a heat dissipation circulation drive unit (400) on one side. The transmission component of the heat dissipation circulation drive unit (400) is connected to the extended end of the motor shaft (130) and drives the liquid cooling circulation synchronously with the rotation of the motor shaft (130) and performs air cooling on the external circulation radiator (300).

2. A permanent magnet synchronous motor with anti-demagnetization function according to claim 1, characterized in that: The water-cooled outer casing assembly (210) includes an outer casing (211), a rear sealing ring (212), a casing coolant inlet (213), a casing coolant outlet (214), a threaded hole block (215), a cooling inner casing (216), a cooling channel (217), and a front sealing ring (218). The cooling inner housing (216) is coaxially disposed inside the outer housing (211), the rear sealing ring (212) is fixedly welded to the rear opening of the outer housing (211), and a cooling flow channel (217) is provided on the outer side of the cooling inner housing (216). The coolant inlet (213) and coolant outlet (214) of the housing are both fixedly installed on the outer wall of the outer housing (211) and are respectively connected to both ends of the cooling channel (217). Several threaded hole blocks (215) are fixed circumferentially to the front end of the outer housing (211) for connecting and fixing the front sealing ring (218).

3. A permanent magnet synchronous motor with anti-demagnetization function according to claim 2, characterized in that: The cooling channel (217) is a continuous channel that extends axially along the outer wall of the cooling inner casing (216).

4. A permanent magnet synchronous motor with anti-demagnetization function according to claim 1, characterized in that: The rear cooling end cap (220) includes an end cap ring (221), an end cap reinforcing rib (222), a bearing seat (223), an end cooling pipe (224), an end cap liquid cooling inlet (225), and an end cap liquid cooling outlet (226). The bearing housing (223) is coaxially disposed in the central area of ​​the end cap ring (221), and several end cap reinforcing ribs (222) are radially and uniformly connected between the outer peripheral wall of the bearing housing (223) and the inner peripheral wall of the end cap ring (221) to form the supporting skeleton of the end cap. The end cap ring (221) is fixed to the rear end of the water-cooled outer shell assembly (210). The end cooling pipe (224) is embedded in the end cap ring (221) and the end cap reinforcing rib (222). The end cap liquid cooling inlet (225) and the end cap liquid cooling outlet (226) are both fixedly installed on the outer wall of the end cap ring (221) and are respectively connected to the beginning and end ends of the end cooling pipe (224).

5. A permanent magnet synchronous motor with anti-demagnetization function according to claim 1, characterized in that: The external circulation radiator (300) includes a radiator core (310), a liquid filling port (320), a liquid return pipe (330), a liquid outlet pipe (340), and a radiator mounting bracket (350). The radiator mounting bracket (350) is fixedly connected to the side frame of the radiator core (310) and is used to fix the external circulation radiator (300) as a whole on the heat dissipation circulation drive unit (400). The liquid replenishment port (320) is fixedly set on the top of the radiator core (310) and is connected to the heat exchange channel inside the radiator core (310) to replenish the coolant in the loop. The return pipe (330) and the outlet pipe (340) are respectively connected to the inlet end and outlet end of the radiator core (310) to connect to the coolant circulation loop and realize the function of high temperature coolant flowing in for heat dissipation and cooling and then flowing out for supply.

6. A permanent magnet synchronous motor with anti-demagnetization function according to claim 5, characterized in that: The radiator core (310) is a finned tube type.

7. A permanent magnet synchronous motor with anti-demagnetization function according to claim 1, characterized in that: The heat dissipation circulation drive unit (400) includes a unit mounting frame (410), a drive shaft seat (420), a driven pulley (430), a drive belt (440), cooling fan blades (450), a cooling circulation pump (460), and a liquid supply pipeline (470). One side of the unit mounting frame (410) is fixedly connected to the outer wall of the water-cooled housing assembly (210) as the mounting base of the whole unit. The drive shaft seat (420) is fixedly installed on the middle frame of the unit mounting frame (410). The driven pulley (430) is fixed on the drive shaft of the drive shaft seat (420). The drive belt (440) is tensioned and fitted between the driven pulley (430) and the extended end of the motor shaft (130), forming a belt drive pair to synchronously transmit the rotational power of the motor shaft (130). The cooling fan blades (450) are fixed to one end of the drive shaft of the drive shaft seat (420), rotate synchronously with the driven pulley (430) and are positioned facing the external circulation radiator (300) to output forced air cooling airflow. The cooling circulation pump (460) is fixedly installed on the other side of the unit mounting frame (410), and its power input shaft is coaxially connected to the other end of the drive shaft of the drive shaft seat (420). The liquid supply pipeline (470) is connected to the liquid outlet of the cooling circulation pump (460) to deliver the pressurized coolant to the water-cooled shell assembly (210) and the rear cooling end cover (220).

8. A permanent magnet synchronous motor with anti-demagnetization function according to claim 1, characterized in that: The stator and rotor section (100) also includes an output end cover (140), fan blades (150), an end cover air outlet (160), and a shaft end pulley (170). The output end cap (140) is sealed and fixed at the front opening of the motor housing (200). The front end of the motor shaft (130) passes through the center of the output end cap (140) and extends outward to form an output end. Multiple sets of the end cap air outlets (160) are opened on the output end cap (140). The fan blades (150) are fixedly set at both ends of the rotor assembly (120). As the rotor assembly (120) rotates, airflow is generated and discharged through the end cap air outlets (160). The shaft end pulley (170) is fixedly sleeved on the rear end of the motor shaft (130) for transmitting rotational power outward.

9. A permanent magnet synchronous motor with anti-demagnetization function according to claim 8, characterized in that: The stator assembly (110) is coaxially arranged around the outside of the rotor assembly (120), with a working gap between them. The outer wall of the stator assembly (110) is fixedly attached to the inner wall of the motor housing (200).

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