Variable frequency three-phase permanent magnet motor

Abstract

The application discloses a variable-frequency three-phase permanent magnet motor, which comprises a motor body and a cushion block fixedly connected to the motor body, and a mounting plate fixedly connected to the bottom of the cushion block. The motor body is provided with a plurality of cooling boxes, cover plates, heat dissipation shafts, driven blades, cooling fan blades, dispersion shells, dispersion pipes, insertion grooves, liquid storage tanks, insertion blocks, fixing blocks, mounting bolts, electric pumps, liquid suction pipes, liquid outlet pipes, fixing strips, assembly grooves, abutting rings, side pipes, circular shells, recovery shells and communication pipes. In use, the plurality of cooling boxes are attached to the surface of the motor body. The cooling liquid flowing in the cooling boxes can absorb heat without affecting the self-heat dissipation of the heat dissipation fins, thereby constituting water-cooling heat dissipation. The flow of the cooling liquid in the cooling boxes can also drive the cooling fan blades to move. The cooling fan blades blow air to the outside of the motor body, thereby accelerating the heat dissipation around the motor body, improving the heat dissipation effect and prolonging the service life of the motor.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, specifically to a variable frequency three-phase permanent magnet motor. Background Technology

[0002] A variable frequency three-phase permanent magnet motor is a three-phase permanent magnet synchronous motor driven by variable frequency technology. It typically consists of a permanent magnet rotor, stator coils, and a housing. Existing variable frequency three-phase permanent magnet motors have weak demagnetization resistance. In high-temperature environments exceeding the Curie temperature, permanent magnets are prone to irreversible demagnetization, directly leading to a decline in motor performance or even complete failure. Therefore, heat dissipation for the motor is indispensable. However, existing motors mostly rely on fins or airflow for heat dissipation, which is ineffective and cannot protect the permanent magnets inside the motor, easily affecting the motor's service life.

[0003] A search revealed a three-phase permanent magnet motor with publication number CN201868990U suitable for single-phase power supply. The motor shaft has a left bearing and a right bearing, which are respectively connected to a front cover and a rear cover. The front cover and rear cover are connected to a frame, and the frame is connected to a junction box. A rotor, permanent magnet, and stator core are radially mounted in the middle of the shaft, and the stator core is connected to the frame. The stator windings are distributed on the stator core and connected to the junction box. This technical solution also suffers from the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a variable frequency three-phase permanent magnet motor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a variable frequency three-phase permanent magnet motor, comprising a motor body and a pad fixedly connected to the motor body, wherein a mounting plate is fixedly connected to the bottom of the pad, and a plurality of heat dissipation fins are fixedly connected to the surface of the motor body, a cooling box is provided between every two heat dissipation fins, a cover plate is fixedly installed on the cooling box, a heat dissipation shaft is rotatably connected to the cover plate, driven blades are fixedly connected to the surface of the heat dissipation shaft, and cooling fan blades are fixedly connected to the end of the heat dissipation shaft. The flow of coolant in the cooling box will wash over the driven blades, causing the heat dissipation shaft to rotate.

[0006] Optionally, a dispersion shell is provided on the side of the motor body, and a dispersion tube is fixedly connected to the dispersion shell. The end of the dispersion tube away from the dispersion shell is fixedly connected to the cooling box.

[0007] Optionally, a slot is provided on the side of the motor body, a liquid storage tank is provided on the side of the motor body, and a plug is fixedly connected to the side of the liquid storage tank, the plug being movably inserted into the slot.

[0008] Optionally, a fixing block is fixedly connected to the side of the liquid storage tank, and a mounting bolt is provided on the fixing block, which is threadedly connected to the motor body.

[0009] Optionally, an electric pump is fixedly installed on the top of the liquid storage tank, the bottom of the electric pump is connected to the liquid storage tank through a suction pipe, and the side of the electric pump is connected to the dispersion shell through a discharge pipe.

[0010] Optionally, a fixing strip is fixedly connected to the side of the cover plate, and an assembly groove is provided on the side of the fixing strip. One end of the heat dissipation shaft is in contact with the inner wall of the assembly groove. The driven blade is located inside the assembly groove, and a retaining ring is fixedly connected to the surface of the heat dissipation shaft.

[0011] Optionally, a side tube is fixedly connected to the side of the cooling box, and a circular shell is fitted onto the surface of the motor body, with one end of the side tube movably inserted into the circular shell.

[0012] Optionally, a recycling shell is movably inserted into the pad block, and a connecting pipe is fixedly connected to the bottom of the round shell, the connecting pipe being connected to the recycling shell.

[0013] Optionally, a wing block one is fixedly connected to the side of the circular shell, and a wing block two is fixedly connected to the side of the recycling shell. A connecting block is fixedly connected to the side of both the wing block one and the wing block two. The two corresponding connecting blocks are fixedly connected by a linkage rod. A protrusion is fixedly connected to the side of the pad block. A mounting bolt two is provided on the protrusion. The mounting bolt two is threadedly connected to the wing block two.

[0014] Optionally, a stabilizing block is fixedly connected to the cover plate, and a sealing ring is fixedly connected to the stabilizing block.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes the mutual cooperation of a cooling box, cover plate, heat dissipation shaft, driven blades, cooling fan blades, dispersion shell, dispersion tube, slot, liquid storage tank, insert block, fixing block, mounting bolt one, electric pump, suction pipe, discharge pipe, fixing strip, assembly groove, abutment ring, side tube, round shell, recovery shell, connecting pipe, fin block one, fin block two, connecting block, linkage rod, protrusion, mounting bolt two, stabilizing block, and sealing ring. During use, multiple cooling boxes are fitted onto the surface of the motor body. While not affecting the self-heating of the heat dissipation fins, the coolant flowing within the cooling boxes can absorb heat, forming water-cooled heat dissipation. Furthermore, the flow of coolant within the cooling boxes can drive the cooling fan blades, which blow air outwards towards the outside of the motor body, accelerating the dissipation of heat around the motor body. This results in good heat dissipation, extends the service life of the motor, and the heat dissipation structure can be disassembled from the motor body; if one is damaged, the other can still be used. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the front view of the present invention; Figure 2 This is a three-dimensional structural diagram of the invention from a bottom view; Figure 3 This is a three-dimensional exploded view of the front view of the present invention; Figure 4 This is a three-dimensional exploded view of the invention from the bottom view; Figure 5 This is a three-dimensional structural diagram of the circular shell and liquid storage tank of the present invention; Figure 6 This is a three-dimensional exploded cross-sectional view of the circular shell and side tubes of the present invention; Figure 7 This is a three-dimensional structural diagram of the driven blade and fixing bar of the present invention; Figure 8 This is a three-dimensional sectional view of the front view of the dispersion shell and liquid outlet tank of the present invention. Figure 9 This is a three-dimensional sectional view of the structure of the dispersion shell and liquid outlet tank of the present invention. Figure 10 This is a three-dimensional structural diagram of the heat dissipation shaft and driven blades of the present invention. Figure 11 This is a three-dimensional structural diagram of the cooling box fixing strip and other structures of the present invention.

[0017] In the diagram: 1. Motor body, 2. Pad, 3. Mounting plate, 4. Heat dissipation fins, 5. Cooling box, 6. Cover plate, 7. Heat dissipation shaft, 8. Driven blade, 9. Cooling fan blade, 10. Dispersion shell, 11. Dispersion tube, 12. Slot, 13. Liquid storage tank, 14. Insert block, 15. Fixing block, 16. Mounting bolt one, 17. Electric pump, 18. Suction pipe, 19. Discharge pipe, 20. Fixing strip, 21. Assembly groove, 22. Abutment ring, 23. Side pipe, 24. Round shell, 25. Recovery shell, 26. Connecting pipe, 27. Fin one, 28. Fin two, 29. Connecting block, 30. Linkage rod, 31. Protrusion, 32. Mounting bolt two, 33. Stabilizing block, 34. Sealing ring, 35. Controller, 36. Fastening ring, 37. Washer, 38. Electric control valve, 39. Discharge pipe. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-11 A variable frequency three-phase permanent magnet motor includes a motor body 1, which is specifically a variable frequency three-phase permanent magnet motor. It has a basic shell and internal working components. The internal working components will not be described in detail here. The basic shell consists of a central shell and front and rear end covers. In this technical solution, the front and rear end covers are installed on the central shell with conventional screws. The screws are located on the vertical side of the front and rear end covers. Although they are not shown in the figure, their location can be clearly understood from the text description. The connection and installation of the end covers and the central shell is also a conventional technique. The bottom of the central shell is integrally formed with a pad 2. The pad 2 has a square hole. The bottom of the pad 2 is fixedly connected to a mounting plate 3. The mounting plate 3 has four holes. The operator can install the mounting plate 3 into the working position by passing bolts through the holes, thereby fixing the working position of the motor body 1. The central shell is also formed with multiple heat dissipation fins 4. The protruding design of the heat dissipation fins 4 is conducive to heat dissipation.

[0020] During production, the rear end cover of the motor body 1 has two square slots 12 machined into it. Each slot 12 has a matching insert 14 that can be movably inserted into it. The two inserts 14 protrude to one side of the rear end cover and are connected by a coolant reservoir 13. The coolant reservoir 13 is a container for storing coolant. A filling cap is threaded onto the upper part of one side of the reservoir 13. To prevent pressure imbalance, an air vent is machined into the filling cap, allowing outside air to enter and facilitating the extraction of coolant from the reservoir 13. By unscrewing the filling cap, coolant can be injected into the reservoir 13. Many types of coolant are available, and the appropriate type can be selected based on actual usage. Fixing blocks 15 are fixedly connected to both sides of the reservoir 13. Two mounting bolts 16 are provided on block 15. The ends of the mounting bolts 16 pass through the fixing block 15 and are threaded onto the rear end cover. The mounting bolts 16 are used to assemble and lock the liquid storage tank 13 and the motor body 1, making them detachable. If needed later, the motor body 1 and the liquid storage tank 13 can be separated. A liquid filling cap is installed on the upper part of one side of the liquid storage tank 13, and a controller 35 is installed on the upper part of the other side. The controller 35 includes a PLC controller, specifically the Mitsubishi FX1S series, which is small in size and suitable for small industrial scenarios with extremely limited space. An electric pump 17 is fixedly installed on the top of the liquid storage tank 13. The electric pump 17 is electrically connected to the controller 35, and its operation is controlled by the controller 35. A suction pipe 18 is connected to the bottom suction end, and the bottom end of the suction pipe 18 penetrates into the interior of the liquid storage tank 13. The distance between the bottom end of the suction pipe 18 and the bottom of the inner wall of the liquid storage tank 13 is relatively small. This design aims to ensure that the suction pipe 18 can suck up as much coolant as possible from the liquid storage tank 13. An outlet pipe 19 is connected to the side outlet end of the electric pump 17. The outlet pipe 19 is bent, and its bent end connects to a dispersion shell 11. The dispersion shell 11 is a hollow disc-shaped shell with several dispersion tubes 11 fixedly connected to it. The mounting bolt 16 is positioned offset from the dispersion tubes 11. Using a cylindrical wrench, the operator can pass between two adjacent dispersion tubes 11 to remove the mounting bolt 16. A cooling box 5 is fixedly connected to the end of the diffuser 11 away from the diffuser shell 11. The cooling box 5 is attached to the surface of the central shell of the motor body 1, and there is a cooling box 5 between every two adjacent heat dissipation fins 4. The side of the cooling box 5 away from the central shell of the motor body 1 is open. A cover plate 6 is installed at the open. The cover plate 6 is used to seal the opening of the cooling box 5. The sealing and installation mechanism of the cover plate 6 are not shown in the figure. However, the connection and sealing between the cover and the box body is a conventional technology. In actual application, this technical solution only requires glue to attach a rubber ring that matches the opening of the cooling box 5 to the side of the cover plate 6. Then, screws are used to pass through the cover plate 6 and tighten it onto the cooling box 5. The rubber ring will be squeezed, thus completing the assembly and sealing.

[0021] A fixing strip 20 is fixedly connected to the side of the cover plate 6 facing the inside of the cooling box 5. After the fixing strip 20 is placed inside the cooling box 5, it divides the internal space of the cooling box 5. The space reserved inside the cooling box 5 is the passage for the coolant. Multiple assembly grooves 21 are machined on one side of the fixing strip 20. A heat dissipation shaft 7 is set in the assembly groove 21. One end of the heat dissipation shaft 7 contacts the inner wall of the assembly groove 21, and the other end passes through the fixing strip 20 and the cover plate 6, extending to the outside of the cover plate 6. The end of the heat dissipation shaft 7 that contacts the inner wall of the assembly groove 21 is hemispherical. The contact between this end and the inner wall of the assembly groove 21 is a point contact, which results in very low friction. A retaining ring 22 is fixedly connected to the surface of the heat dissipation shaft 7. The retaining ring 22 is located inside the assembly groove 21, and the retaining ring 22... One side is in contact with the inner wall of the assembly groove 21, and both contact surfaces are smooth, which can effectively reduce friction. The setting of the abutment ring 22 ensures that the heat dissipation shaft 7 will only rotate on the fixing strip 20 and will not detach. One end of the heat dissipation shaft 7 located outside the cover plate 6 is fixedly connected to a cooling fan blade 9. The air blowing direction of the cooling fan blade 9 is towards the outside of the motor body 1, which can better remove heat. The surface of the heat dissipation shaft 7 located inside the assembly groove 21 is fixedly connected to multiple driven blades 8. Some of the driven blades 8 extend beyond the outside of the assembly groove 21. When there is coolant flowing in the passage, it can wash onto the driven blades 8, thereby causing the heat dissipation shaft 7 to rotate. Thus, the rotation of the heat dissipation shaft 7 does not require a separate electric drive device; the rotation of the heat dissipation shaft 7 can be achieved by the flow of coolant.

[0022] Multiple stabilizing blocks 33 are fixedly connected to the side of the cover plate 6. The heat dissipation shaft 7 passes through the corresponding stabilizing block 33, and the two are movably connected. The stabilizing block 33 does not affect the rotation of the heat dissipation shaft 7. A sealing ring 34 is fixedly connected to the side of the stabilizing block 33. The sealing ring 34 is made of sealing rubber, and its inner wall contacts the surface of the heat dissipation shaft 7. In this way, the sealing ring 34 seals the gap between the heat dissipation shaft 7 and the stabilizing block 33.

[0023] A circular shell 24 is movably fitted onto the surface of the central housing of the motor body 1. A side tube 23 is fixedly connected to the side of the cooling box 5 corresponding to the circular shell 24. One end of the side tube 23 is movably inserted into the interior of the circular shell 24, and a fastening ring 36 is fixedly connected to the surface of the side tube 23. A washer 37 is fixedly connected to the side of the fastening ring 36 facing the circular shell 24. The washer 37 and the fastening tube 36 are fixedly bonded together with glue. When one end of the side tube 23 is inserted into the circular shell 24, the washer 37 is squeezed, thereby achieving the purpose of sealing the gap between the side tube 23 and the circular shell 24. The coolant entering the cooling box 5 will enter the circular shell 24 through the side tube 23. A connecting pipe 26 is fixedly connected to the bottom of the circular shell 24. A recovery shell 25 is fixedly connected to the bent end of the connecting pipe 26. The recovery shell 25 is inserted into the square hole opened on the pad 2. An electric control valve 38 is installed on the connecting pipe 26. The electrically controlled valve 38 is electrically connected to the controller 35. The opening and closing of the electrically controlled valve 38 is controlled by the controller 35. A discharge pipe 39 is fixedly connected to the lower part of one side of the recovery shell 25. An electrically controlled valve is also installed on the discharge pipe 39. When the electrically controlled valve is opened, the discharge pipe 39 can discharge the recovered coolant. In actual application, a liquid level sensor is fixedly installed on the inner wall of the recovery shell 25 so that the recovered coolant in the recovery shell 25 can be detected in real time, and the coolant can be discharged through the discharge pipe 39 in a timely manner. The discharge pipe 39 is connected to the liquid storage tank 13 through a pipe, which can form a coolant circulation route, so that the coolant can be recycled. The prerequisite for recycling the coolant is to install an industrial chiller on the pipe connecting the liquid storage tank 13 and the discharge pipe 39 to cool the coolant. If the coolant is not recycled, there is no need to install an industrial chiller.

[0024] Two fin blocks 27 are fixedly connected to the circular shell 24, and two fin blocks 28 are fixedly connected to the recovery shell 25. Connecting blocks 29 are fixedly connected to both fin blocks 27 and fin blocks 28. The two corresponding connecting blocks 29 are fixedly connected by a linkage rod 30. One side of the linkage rod 30 is in contact with the circular shell 24. Both sides of the pad block 2 are fixedly connected to protrusions 31. Each protrusion 31 is provided with a mounting bolt 32. The end of the mounting bolt 32 passes through the protrusion 31 and is threaded onto the fin block 28. When the mounting bolt 32 is tightened, the washer 37 is tightly compressed, that is, sealed.

[0025] Before the entire cooling system is put into use, because the positions of the dispersion tubes 11 on the dispersion shell 10 are uneven, the electric pump 17 needs to work continuously for a period of time to inject liquid into each cooling box 5 to ensure that each cooling box 5 is full of coolant.

[0026] When in use, the motor body 1 operates, and the electric pump 17 starts working, drawing in coolant through the suction pipe 18 and injecting it into the dispersion shell 10 through the outlet pipe 19. The coolant is then dispersed into each cooling box 5 through the dispersion pipe 11. The coolant washes over the driven blades 8, causing the heat dissipation shaft 7 to rotate and the cooling fan blades 9 to rotate and blow air. The combination of water cooling and air cooling effectively dissipates the heat generated by the motor body 1, extending the service life of the internal components of the motor body 1. When the motor body 1 is damaged, the operator can unscrew the mounting bolt 22 to remove the round shell 24 from the center shell of the motor body 1. By using a tool to loosen the mounting bolt 16, the liquid storage tank 13 can be separated from the motor body 1, allowing the cooling mechanism to be used independently.

[0027] 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 variable frequency three-phase permanent magnet motor, comprising a motor body (1) and a pad (2) fixedly connected to the motor body (1), wherein a mounting plate (3) is fixedly connected to the bottom of the pad (2), and a plurality of heat dissipation fins (4) are fixedly connected to the surface of the motor body (1), characterized in that: A cooling box (5) is provided between each pair of heat dissipation fins (4). A cover plate (6) is fixedly installed on the cooling box (5). A heat dissipation shaft (7) is rotatably connected to the cover plate (6). A driven blade (8) is fixedly connected to the surface of the heat dissipation shaft (7). A cooling fan blade (9) is fixedly connected to the end of the heat dissipation shaft (7). The flow of coolant in the cooling box (5) will wash over the driven blade (8), causing the heat dissipation shaft (7) to rotate.

2. The variable frequency three-phase permanent magnet motor according to claim 1, characterized in that: The motor body (1) has a dispersion shell (10) on its side, and a dispersion tube (11) is fixedly connected to the dispersion shell (10). The end of the dispersion tube (11) away from the dispersion shell (10) is fixedly connected to the cooling box (5).

3. The variable frequency three-phase permanent magnet motor according to claim 2, characterized in that: The motor body (1) has a slot (12) on its side and a liquid storage tank (13) on its side. A plug (14) is fixedly connected to the side of the liquid storage tank (13) and the plug (14) is movably inserted into the slot (12).

4. The variable frequency three-phase permanent magnet motor according to claim 3, characterized in that: A fixing block (15) is fixedly connected to the side of the liquid storage tank (13), and a mounting bolt (16) is provided on the fixing block (15). The mounting bolt (16) is threadedly connected to the motor body (1).

5. The variable frequency three-phase permanent magnet motor according to claim 4, characterized in that: An electric pump (17) is fixedly installed on the top of the storage tank (13). The bottom of the electric pump (17) is connected to the storage tank (13) through a suction pipe (18). The side of the electric pump (17) is connected to the dispersion shell (10) through a discharge pipe (19).

6. The variable frequency three-phase permanent magnet motor according to claim 5, characterized in that: A fixing strip (20) is fixedly connected to the side of the cover plate (6). An assembly groove (21) is provided on the side of the fixing strip (20). One end of the heat dissipation shaft (7) is in contact with the inner wall of the assembly groove (21). The driven blade (8) is located inside the assembly groove (21). A retaining ring (22) is fixedly connected to the surface of the heat dissipation shaft (7).

7. The variable frequency three-phase permanent magnet motor according to claim 6, characterized in that: The side of the cooling box (5) is fixedly connected to a side tube (23), and a round shell (24) is fitted on the surface of the motor body (1). One end of the side tube (23) is movably inserted into the round shell (24).

8. The variable frequency three-phase permanent magnet motor according to claim 7, characterized in that: A recycling shell (25) is movably inserted into the pad (2), and a connecting pipe (26) is fixedly connected to the bottom of the round shell (24), and the connecting pipe (26) is connected to the recycling shell (25).

9. The variable frequency three-phase permanent magnet motor according to claim 8, characterized in that: The side of the round shell (24) is fixedly connected to a wing block one (27), the side of the recycling shell (25) is fixedly connected to a wing block two (28), the sides of the wing block one (27) and the wing block two (28) are both fixedly connected to a connecting block (29), the two corresponding connecting blocks (29) are fixedly connected to each other by a linkage rod (30), the side of the pad block (2) is fixedly connected to a protrusion (31), the protrusion (31) is provided with a mounting bolt two (32), the mounting bolt two (32) is threadedly connected to the wing block two (28).

10. The variable frequency three-phase permanent magnet motor according to claim 9, characterized in that: A stabilizing block (33) is fixedly connected to the cover plate (6), and a sealing ring (34) is fixedly connected to the stabilizing block (33).

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