Three-phase permanent magnet synchronous motor for a ship

Abstract

The application relates to the motor technical field and discloses a three-phase permanent magnet synchronous motor for a ship, which comprises a shell, a rotor rotating shaft arranged in the shell, a front end cover and a rear end cover fixedly arranged on the two sides of the shell, two up-and-down distributed flow guide grooves arranged on the rotor rotating shaft and communicated at one end close to the front end cover, a water cooling liquid circulating device and a water cooling liquid cooling device fixedly arranged at one end of the rotor rotating shaft and located in the rear end cover, wherein the water cooling liquid circulating device comprises an upper circular groove and a lower circular groove, and the water cooling liquid cooling device comprises a heat exchange scroll. When the rotor rotates in the shell, the water cooling liquid in the upper circular groove, the lower circular groove, the heat exchange scroll and the flow guide groove circulates and flows, the circulating water cooling liquid carries away the heat generated when the rotor rotates in the shell, external cold air flows through the heat dissipation fin plates on the heat exchange scroll, the water cooling liquid after heat exchange is cooled, and the rotor in the shell can be cooled when the shell is sealed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric motors, in particular to a three-phase permanent magnet synchronous motor for a ship. BACKGROUND

[0002] The three-phase permanent magnet synchronous motor for a ship is a kind of high-efficiency and high-performance motor which is more and more popular in the ship electric propulsion and auxiliary system in recent years. The motor uses permanent magnets to generate rotor magnetic field, replacing the excitation winding in the traditional induction motor or electrically excited synchronous motor. Since the permanent magnet synchronous motor has no rotor copper loss (excitation loss), the iron loss and stray loss are also relatively low, so it has the advantage of high efficiency. In addition, the permanent magnet generates a strong magnetic field, so that the motor can output more power and torque under the same volume and weight, which can optimize the ship design and loading capacity, and has lower noise and vibration.

[0003] The three-phase permanent magnet synchronous motor needs to be cooled when working. Considering the high humidity of the ship environment, the existing cooling method is to pass circulating water cooling liquid into the shell to cool down. However, the rotor heat in the motor relies on the air gap between the rotor and the stator for heat conduction, which makes the heat conduction efficiency low, and thus the rotor heat in the motor is higher than that of the stator. The insufficient heat dissipation of the rotor can cause the demagnetization of the permanent magnet, the failure of bearing lubrication and other conditions that reduce the service life of the motor. SUMMARY

[0004] The application provides a three-phase permanent magnet synchronous motor for a ship, which has the advantage of efficiently cooling the rotor in the motor in a sealed environment, to solve the problem of poor rotor cooling effect caused by the rotor relying on the air gap between the rotor and the stator for heat conduction in the existing motor.

[0005] To achieve the above purpose, the application adopts the following technical scheme: a three-phase permanent magnet synchronous motor for a ship, comprising a shell and a rotor shaft arranged in the shell, a front end cover and a rear end cover are fixedly installed on both sides of the shell, two upper and lower flow guide grooves are formed in the rotor shaft, and the two flow guide grooves are communicated at one end close to the front end cover, and a water cooling liquid circulating device and a water cooling liquid cooling device are fixedly installed at one end of the rotor shaft and located in the rear end cover.

[0006] The water cooling liquid circulating device comprises a positioning double pipe fixedly installed at one end of the rotor shaft, and an upper circular groove and a lower circular groove are formed in the positioning double pipe, and the upper circular groove and the lower circular groove are communicated with the two flow guide grooves respectively.

[0007] The water-cooled liquid cooling device includes a heat exchange scroll, the interior of the heat exchange scroll is connected to the upper circular groove and the lower circular groove, the heat exchange scroll is provided with a plurality of heat dissipation fins distributed in a circumferential array, a cooling fan located on one side of the water-cooled liquid cooling device is fixedly mounted on the rotor shaft, an air intake groove located outside the cooling fan is provided on the rear end cover, and an exhaust groove located on one side of the water-cooled liquid cooling device is provided on the side of the side cover.

[0008] When the rotor in the shell runs, the water-cooling liquid circulates in the upper circular groove, the lower circular groove, the heat exchange vortex tube and the guide groove, and the cooling fan rotates with the rotor shaft to cool the water-cooling liquid after heat exchange.

[0009] Furthermore, a side cover is fixedly installed on the side of the rear end cover away from the outer shell. The side cover is fixed to the rear end cover by bolts, and the diameter of the side cover is larger than the diameter of the water-cooled liquid cooling device and the cooling fan. The water-cooled liquid cooling device and the cooling fan can be removed on one side of the rear end cover for subsequent cleaning and replacement, which is convenient for use.

[0010] Furthermore, a movable sleeve is provided in the upper circular groove, and a first one-way valve facing the guide groove side is fixedly installed on the movable piston, and a spring is provided between the movable piston and the side wall of the rotor shaft, and a positioning piston close to the guide groove side is fixedly installed inside the lower circular groove, and a second one-way valve is fixedly installed on the side of the positioning piston away from the guide groove. The movable piston moves back and forth in the upper circular groove, in conjunction with the first one-way valve provided on the movable piston and the positioning piston provided at the connection between the lower circular groove and the guide groove, the water-cooling liquid in the upper circular groove, the guide groove, the lower circular groove and the heat exchange vortex can circulate, so that the water-cooling liquid can take away the heat generated by the rotor in the outer shell during operation, avoiding the problem of uneven temperature of the rotor and the rotor shaft in the outer shell and local overheating, and also ensuring the sealing effect in the outer shell to prevent external humid air or dust from affecting the rotor.

[0011] Furthermore, a reflux port is provided at the top of the positioning double tube, which is away from the rotor shaft. The reflux port is connected to the upper circular groove. A liquid outlet is provided at the bottom of the positioning double tube, which is connected to the lower circular groove. The liquid outlet is located on the side of the positioning piston away from the rotor shaft. The water-cooling liquid for heat exchange with the rotor in the outer shell enters the heat exchange vortex through the liquid outlet, and the water-cooling liquid after heat dissipation and cooling enters the upper circular groove again through the reflux port, so that the water-cooling liquid can circulate in the heat exchange vortex, the upper circular groove, the guide groove and the lower circular groove for continuous use, while dissipating heat to the rotor in the outer shell and is isolated from the outside world.

[0012] Furthermore, the number of the heat exchange vortex tubes is set to two, and one end of the two heat exchange vortex tubes is connected by an intermediate connecting tube, one end of the heat exchange vortex tubes away from the intermediate connecting tube is connected to the liquid outlet, and the other end of the heat exchange vortex tubes away from the intermediate connecting tube is connected to the return port. The water-cooling liquid in the lower circular groove flows to one of the heat exchange vortex tubes through the liquid outlet, and after the water-cooling liquid flows to the other heat exchange vortex tube through the intermediate connecting tube, it flows back to the upper circular groove through the return port. The number of the heat exchange vortex tubes is set to two, which increases the cooling time of the water-cooling liquid, so that the water-cooling liquid that re-flows into the guide groove is stable and low enough, which can effectively cool the rotor in the outer casing.

[0013] Furthermore, a water-cooled liquid circulation power device is provided inside the rear end cover and is located on the other side of the water-cooled liquid cooling device. The water-cooled liquid circulation power device includes a positioning block installed at one end of the positioning double tube and an electromagnet fixedly installed inside the rear end cover. The positioning block is provided with a slide groove connected to the upper circular groove. A passive piston is movably sleeved in the slide groove. A linkage part is fixedly connected between the passive piston and the movable piston. A magnetic ring is fixedly installed on the side of the passive piston away from the linkage part. When the electromagnet is energized, it magnetically repels the magnetic ring, causing the magnetic ring to overcome the elastic force of the spring and push the passive piston, the linkage part, the movable piston and the first one-way valve as a whole to move toward one side of the rotor shaft. A sealing cover is fixedly installed on the side of the positioning block away from the positioning double tube.

[0014] Furthermore, the outer side of the linkage part does not contact the inner wall of the slide groove, and a notch is opened on the outer side of the linkage part so that the water-cooling liquid returning through the return port can flow into the guide groove through the middle of the movable piston and the first one-way valve.

[0015] Furthermore, a sealing block is provided between the positioning block and the positioning double tube, and a through hole connecting the slide groove and the upper circular groove is opened on the sealing block. The sealing block forms a seal at the connection part of the positioning block and the positioning double tube to ensure that the water-cooling liquid will not leak.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present application provides a three-phase permanent magnet synchronous motor for ships, which provides a water-cooled liquid circulation device and a water-cooled liquid cooling device at one end of the rotor shaft, and opens two connected guide grooves in the rotor shaft, so that the guide groove is connected to the upper circular groove and the lower circular groove in the water-cooled liquid circulation device and the total heat exchange vortex of the water-cooled liquid cooling device. When the rotor in the outer shell rotates, the water-cooled liquid circulates in the upper circular groove, the lower circular groove, the heat exchange vortex and the guide groove, and the circulating water-cooled liquid is used to take away the heat generated by the operation of the rotor in the outer shell, and then the humid cold air flow in the ship environment flows through the heat dissipation fins on the heat exchange vortex to cool the water-cooled liquid after heat exchange, so that the rotor in the outer shell can be cooled while ensuring the sealing of the rotor in the outer shell. Compared with the existing motor that relies solely on heat conduction in the air gap between the rotor and the stator for cooling, the stator cooling effect of the motor is better.

[0018] 2. When the electromagnet is energized, the magnetic repulsion of the magnetic ring pushes the movable piston in the upper circular groove to move. Cooperating with the elastic force of the spring, the water-cooling liquid in the upper circular groove, the lower circular groove, the heat exchange vortex tube and the guide groove can circulate under the condition of sealing, avoiding the problem of water-cooling liquid leakage caused by the use of dynamic sealing methods such as rotary joints, thereby improving the service life of the motor's heat dissipation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can also derive other drawings based on the provided drawings without inventive work.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the internal structure of the middle shell;

[0022] Figure 3 for Figure 1 Schematic diagram of the middle section structure;

[0023] Figure 4 for Figure 3 Schematic diagram of the structure of the water-cooling liquid circulation device;

[0024] Figure 5 for Figure 2 Schematic diagram of the structure of the water-cooled liquid cooling device;

[0025] Figure 6 for Figure 5 Left side view of the water-cooled cooling device;

[0026] Figure 7 For Figure 3 Circuit system block diagram of middle electromagnet.

[0027] In the figure: 1, the shell; 2, the rotor shaft; 201, the flow guide groove; 3, the front end cover; 4, the rear end cover; 401, the air inlet groove; 5, the side cover; 501, the exhaust groove; 6, the water cooling liquid circulating device; 601, the positioning double tube; 602, the upper circular groove; 603, the lower circular groove; 604, the moving piston; 605, the first one-way valve; 606, the positioning piston; 607, the second one-way valve; 608, the backflow port; 609, the liquid outlet; 7, the water cooling liquid cooling device; 701, the mounting ring; 702, the heat dissipation fin plate; 703, the heat exchange scroll tube; 704, the intermediate communication pipe; 8, the heat dissipation fan; 9, the sealing block; 10, the water cooling liquid circulating power device; 101, the positioning block; 102, the electromagnet; 103, the sliding groove; 104, the passive piston; 105, the linkage; 106, the notch; 107, the magnetic ring; 108, the cover. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] Embodiments, such as Figures 1-3 A three-phase permanent magnet synchronous motor for a ship includes a shell 1 and a rotor shaft 2 arranged in the shell 1. The shell 1 is fixedly provided with a front end cover 3 and a rear end cover 4 at two ends respectively. The connection parts of the front end cover 3 and the rear end cover 4 with the rotor shaft 2 are movably and sealingly arranged to prevent external humid air from entering the shell 1. The rear end cover 4 is fixedly provided with a side cover 5 away from the shell 1. The side cover 5 is fixed to the rear end cover 4 by bolts, facilitating disassembly and replacement of parts in the rear end cover 4. The rotor shaft 2 is provided with two flow guide grooves 201 arranged in an upper and lower manner and communicated at an end close to the front end cover 3. The rotor shaft 2 is fixedly provided with a water cooling liquid circulating device 6 in the rear end cover 4.

[0030] Please refer to Figures 2-4The water cooling liquid circulating device 6 comprises a positioning double pipe 601 fixedly installed at one end of the rotor rotating shaft 2, and an upper circular groove 602 and a lower circular groove 603 are respectively formed in the positioning double pipe 601, and the upper circular groove 602 and the lower circular groove 603 are respectively communicated with the two flow guide grooves 201, a movable piston 604 is movably sleeved in the upper circular groove 602, a first one-way valve 605 is fixedly installed on the movable piston 604 and faces the flow guide groove 201, a spring is arranged between the movable piston 604 and the side wall of the rotor rotating shaft 2, a positioning piston 606 is fixedly installed in the lower circular groove 603 and close to the flow guide groove 201, a second one-way valve 607 is fixedly installed on the side of the positioning piston 606 away from the flow guide groove 201, a backflow port 608 is arranged at the top of the positioning double pipe 601 and away from the rotor rotating shaft 2, the backflow port 608 is communicated with the upper circular groove 602, and a liquid outlet 609 is arranged at the bottom of the positioning double pipe 601 and communicated with the lower circular groove 603, and the liquid outlet 609 is located at the side of the positioning piston 606 away from the rotor rotating shaft 2.

[0031] Please refer to Figures 2-6 A water cooling liquid cooling device 7 is fixedly installed on the outside of the positioning double pipe 601, and the water cooling liquid cooling device 7 comprises a mounting ring 701 fixedly installed on the positioning double pipe 601, a plurality of heat dissipation fin plates 702 are fixedly installed on the outside of the mounting ring 701, the number of the heat dissipation fin plates 702 is not less than four, the plurality of heat dissipation fin plates 702 are circumferentially arranged on the mounting ring 701, two heat exchange scroll pipes 703 are fixedly installed on the heat dissipation fin plates 702, one end of the two heat exchange scroll pipes 703 is connected through an intermediate communication pipe 704, one end of one of the heat exchange scroll pipes 703 away from the intermediate communication pipe 704 is communicated with the liquid outlet 609, and one end of the other heat exchange scroll pipe 703 away from the intermediate communication pipe 704 is communicated with the backflow port 608, the water cooling liquid in the lower circular groove 603 flows to one of the heat exchange scroll pipes 703 through the liquid outlet 609, and the water cooling liquid flows to the other heat exchange scroll pipe 703 through the intermediate communication pipe 704, and then flows back to the upper circular groove 602 through the backflow port 608.

[0032] When the movable piston 604 moves towards the rotor rotating shaft 2, the movable piston 604 pressurizes the right side water cooling liquid into the flow guide groove 201 above the rotor rotating shaft 2, so that the water pressure in the flow guide groove 201 increases, and then the second one-way valve 607 is opened, the water cooling liquid in the flow guide groove 201 below the rotor rotating shaft 2 flows into the lower circular groove 603, and then flows to the water cooling liquid cooling device 7 through the liquid outlet 609, and the water cooling liquid in the water cooling liquid cooling device 7 is cooled, and then flows back to the left side chamber of the upper circular groove 602 through the backflow port 608, so that the water cooling liquid circulates in the flow guide groove 201 to take away the heat generated by the rotor on the rotor rotating shaft 2.

[0033] A cooling fan 8 located on one side of the water-cooled liquid cooling device 7 is fixedly mounted on the rotor shaft 2. An air intake slot 401 located on the outside of the cooling fan 8 is provided on the rear end cover 4, and an exhaust slot 501 located on the side of the side cover 5 is provided. The cooling fan 8 is also driven to rotate by the rotor shaft 2, so that external cold air enters through the air intake slot 401, contacts and exchanges heat with the heat dissipating fins 702 in the water-cooled liquid cooling device 7, and then flows out through the exhaust slot 501, thereby cooling the water-cooled liquid flowing through the guide slot 201 in the rotor shaft 2, thereby achieving the effect of cooling the rotor in the outer casing 1, and at the same time preventing external humid air and dust from affecting the rotor in the outer casing 1.

[0034] The diameter of the side cover 5 is larger than the diameter of the water-cooled liquid cooling device 7 and the cooling fan 8, so that the water-cooled liquid cooling device 7 and the cooling fan 8 can be removed on one side of the rear end cover 4 for subsequent cleaning and replacement.

[0035] The interior of the rear end cover 4 is provided with a water-cooled liquid circulation power device 10 located on the other side of the water-cooled liquid cooling device 7. The water-cooled liquid circulation power device 10 includes a positioning block 101 installed at one end of the positioning double tube 601 and an electromagnet 102 fixedly installed inside the rear end cover 4. The electromagnet 102 can be fixedly installed in the middle of the inner side of the side cover 5. A slide 103 connected to the upper circular groove 602 is provided on the positioning block 101. A passive piston 104 is movably sleeved in the slide 103. A linkage member 105 is fixedly connected between the passive piston 104 and the movable piston 604. The outer side of the linkage member 105 does not contact the inner wall of the slide 103, and A slot 106 is provided on the outer side of the linkage part 105, so that the water-cooling liquid returning through the reflux port 608 can flow into the guide groove 201 through the middle of the movable piston 604 and the first one-way valve 605. A magnetic ring 107 is fixedly installed on the side of the passive piston 104 away from the linkage part 105. When the electromagnet 102 is energized, it magnetically repels the magnetic ring 107, causing the magnetic ring 107 to overcome the elastic force of the spring and push the passive piston 104, the linkage part 105, the movable piston 604 and the first one-way valve 605 as a whole to move toward one side of the rotor shaft 2. A cover 108 is fixedly installed on the side of the positioning block 101 away from the positioning double tube 601.

[0036] A sealing block 9 is provided between the positioning block 101 and the positioning double tube 601, and a through hole connecting the slide groove 103 and the upper circular groove 602 is opened on the sealing block 9. The sealing block 9 forms a seal at the connection part between the positioning block 101 and the positioning double tube 601 to prevent leakage of water-cooling liquid.

[0037] See also Figures 2-4 、 Figure 7The power on and off of the electromagnet 102 is controlled by the cycle time relay, that is, by setting, the running time of "1-5S" and the stop time of "1-5S" can be set through the cycle time relay. For example, after setting the time for the electromagnet 102 to run for 3S and stop for 3S, the contactor in the cycle time relay is attracted, and the electromagnet 102 generates a magnetic repulsive force on the magnetic ring 107 after being energized, so that the magnetic ring 107 pushes the passive piston 104, the linkage 105, the movable piston 604 and the first one-way valve 605 toward one side of the rotor shaft 2. After three seconds, the contactor in the cycle time relay is disconnected, the electromagnet 102 is de-energized, and the spring The elastic force of the spring causes the movable piston 604 to drive the linkage part 105, the passive piston 104 and the magnetic ring 107 to move away from one side of the rotor shaft 2. After another three seconds, the contactor in the cycle time relay is energized, and this cycle repeats, cooperating with the one-way flow control of the first one-way valve 605 and the positioning piston 606, so that the water-cooling liquid in the heat dissipating fin 702, the upper circular groove 602, the guide groove 201 and the lower circular groove 603 can circulate, thereby utilizing the water-cooling liquid to absorb the heat generated when the rotor in the housing 1 is working, and the external humid air flow acts on the heat dissipating fin 702 to cool the water-cooling liquid after absorbing heat for recycling.

[0038] During use, the rotor in the housing 1 drives the rotor shaft 2 to rotate, and the rotor shaft 2 drives the cooling fan 8 to rotate, so that the external cold air enters through the air inlet groove 401 and flows through the heat dissipation fins 702, cooling the water-cooled liquid in the heat exchange vortex 703. The air flow after heat exchange is discharged through the exhaust groove 501. At the same time, the electromagnet 102 is energized, and the magnetic repulsion force pushes the magnetic ring 107 to drive the passive piston 104, the linkage 105, the movable piston 604 and the first one-way valve 605 to move toward one side of the rotor shaft 2. At this time, the first one-way valve 605 is closed, and the water-cooled liquid in the upper circular groove 602 enters the guide groove 201 above the rotor shaft 2. The water-cooled liquid in the guide groove 201 above the rotor shaft 2 flows to the lower circular groove 603 through the lower guide groove 201 and pushes the second one-way valve 607 to open, thereby taking away the water generated when the rotor in the housing 1 is running. The heat is generated, and the water-cooling liquid in the lower circular groove 603 flows to the heat dissipation fin 702 through the liquid outlet 609. The external humid air contacts the heat dissipation fin 702 to cool the water-cooling liquid in the heat exchange vortex 703. After the electromagnet 102 is powered off, the elastic force of the spring pushes the movable piston 604, the first one-way valve 605, the linkage 105, the passive piston 104 and the magnetic ring 107 to move away from one side of the rotor shaft 2. The first one-way valve 605 is opened, and the water-cooling liquid refluxed from the reflux port 608 flows to one side of the guide groove 201 through the middle part of the movable piston 604 and the first one-way valve 605. The electromagnet 102 is energized, de-energized, and then energized again, so that the water-cooling liquid in the guide groove 201, the upper circular groove 602, the heat exchange vortex 703 and the lower circular groove 603 circulates, taking away the heat generated when the rotor in the housing 1 is running.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-phase permanent magnet synchronous motor for ships, comprising a housing and a rotor shaft disposed within the housing, with a front cover and a rear cover fixedly mounted on both sides of the housing, characterized in that: The rotor shaft is provided with two guide grooves distributed vertically, and the two guide grooves are connected at one end close to the front cover. A water-cooling liquid circulation device and a water-cooling liquid cooling device located inside the rear cover are fixedly installed at one end of the rotor shaft; The water-cooling liquid circulation device includes a positioning double tube fixedly installed at one end of the rotor shaft, and the interior of the positioning double tube is respectively provided with an upper circular groove and a lower circular groove, and the upper circular groove and the lower circular groove are respectively connected to the two guide grooves; The water-cooled liquid cooling device includes a heat exchange scroll, the interior of the heat exchange scroll is connected to the upper circular groove and the lower circular groove, the heat exchange scroll is provided with a plurality of heat dissipation fins distributed in a circumferential array, a heat dissipation fan located on one side of the water-cooled liquid cooling device is fixedly mounted on the rotor shaft, an air intake groove located outside the heat dissipation fan is provided on the rear end cover, and an exhaust groove located on one side of the water-cooled liquid cooling device is provided on the side of the side cover; A movable piston is movably mounted in the upper circular groove, a first one-way valve facing the guide groove is fixedly mounted on the movable piston, and a spring is provided between the movable piston and the side wall of the rotor shaft; a positioning piston close to the guide groove is fixedly mounted inside the lower circular groove, and a second one-way valve is fixedly mounted on the side of the positioning piston away from the guide groove; The top of the positioning double tube is provided with a reflux port on the side away from the rotor shaft, and the reflux port is connected to the upper circular groove. The bottom of the positioning double tube is provided with a liquid outlet, and the liquid outlet is connected to the lower circular groove. The liquid outlet is located on the side of the positioning piston away from the rotor shaft. A water-cooled liquid circulation power device is provided inside the rear end cover and is located on the other side of the water-cooled liquid cooling device. The water-cooled liquid circulation power device includes a positioning block installed at one end of the positioning double tube and an electromagnet fixedly installed inside the rear end cover. The positioning block is provided with a slide groove connected to the upper circular groove. A passive piston is movably sleeved in the slide groove. A linkage is fixedly connected between the passive piston and the movable piston. A magnetic ring is fixedly installed on the side of the passive piston away from the linkage. When the electromagnet is energized, it magnetically repels the magnetic ring. When the rotor in the shell runs, the water-cooling liquid circulates in the upper circular groove, the lower circular groove, the heat exchange vortex tube and the guide groove, and the cooling fan rotates with the rotor shaft to cool the water-cooling liquid after heat exchange.

2. The three-phase permanent magnet synchronous motor for ships according to claim 1, characterized in that: A side cover is fixedly mounted on a side of the rear end cover away from the housing. The side cover is fixed to the rear end cover by bolts, and a diameter of the side cover is greater than a diameter of the water-cooled liquid cooling device and the heat dissipation fan.

3. The three-phase permanent magnet synchronous motor for ships according to claim 1, characterized in that: The number of the heat exchange vortex tubes is set to two, and one end of the two heat exchange vortex tubes is connected through an intermediate connecting tube, one end of the heat exchange vortex tube away from the intermediate connecting tube is connected to the liquid outlet, and the other end of the heat exchange vortex tube away from the intermediate connecting tube is connected to the return port.

4. The three-phase permanent magnet synchronous motor for ships according to claim 1, characterized in that: The outer side of the linkage part does not contact the inner wall of the sliding groove, and a notch is provided on the outer side of the linkage part.

5. The three-phase permanent magnet synchronous motor for ships according to claim 4, characterized in that: A sealing block is provided between the positioning block and the positioning double tube, and a through hole communicating with the sliding groove and the upper circular groove is opened on the sealing block.

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