Permanent magnet direct drive motor driving structure of cooling tower fan

Abstract

The utility model provides a permanent magnet direct drive motor driving structure of a cooling tower fan, and belongs to the technical field of permanent magnet direct drive motors. The permanent-magnet direct-drive motor driving structure of the cooling tower fan comprises a permanent-magnet rotating core assembly, a rotation-following limiting assembly and a rotating shaft assembly. The following rotation limiting assembly comprises a penetrating shaft barrel piece, a limiting baffle ring piece, a penetrating rod and a check nut. According to the permanent magnet direct drive motor driving structure of the cooling tower fan, firstly, an assembly type structure is adopted, the replacement process is simple, secondly, the limiting baffle ring pieces are connected in two ways through tightening of the threads and the tightening nuts, the fixing effect of the limiting baffle ring pieces can still be kept through the penetrating rods and the tightening nuts when threaded connection fails, and the situation that the fixing effect is affected due to connection failure of the limiting baffle ring pieces is reduced. And safety accidents are avoided. When the permanent magnet rotating core assembly rotates, the limiting baffle ring piece and the penetrating shaft barrel piece can be driven to rotate through limiting of the penetrating rod, the rotating shaft assembly rotates along with the penetrating shaft barrel piece, and driving output of the permanent magnet motor is formed.

Description

Technical Field

[0001] The utility model relates to the field of permanent magnet direct drive motors, and in particular to a driving structure of a permanent magnet direct drive motor for a cooling tower fan. Background Art

[0002] The cooling tower fan uses a permanent magnet direct drive motor to directly drive the fan. Compared with the traditional asynchronous motor acceleration and deceleration mechanism, the permanent magnet direct drive synchronous motor system has significant advantages in procurement cost, system maintenance, energy conservation and emission reduction. The structure of the permanent magnet direct drive motor is mainly composed of stator, rotor and casing, and the rotor as the direct drive output structure is composed of shaft, rotor core and permanent magnet. In the related technology, the shaft, rotor core and permanent magnet of the driving structure of the permanent magnet direct drive motor of the cooling tower fan are fixed to each other. First, the replacement process of the permanent magnet is complicated. Second, the permanent magnet is inserted into the mounting groove on the rotor core. A magnetic isolation shaft is installed in the center of the rotor core. The magnetic isolation retaining ring is screwed on the shaft cylinder through threads. The magnetic isolation retaining ring limits the position of the permanent magnet in the rotor core. The shaft cylinder rotates with the rotor core, and the shaft is fixed in the shaft cylinder. The shaft rotates with the shaft cylinder. In this process, the magnetic isolation retaining ring and the shaft cylinder are only connected by threads. If the threads fail, the retaining ring is easy to fail. The one-way rotation between the magnetic isolation retaining ring and the shaft cylinder will become tighter and tighter, but reverse rotation cannot be performed because the magnetic isolation retaining ring is easy to fall off from the shaft cylinder through threads, and the falling of the retaining ring is prone to safety accidents.

[0003] How to invent a permanent magnet direct drive motor drive structure for a cooling tower fan to improve these problems has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a permanent magnet direct drive motor drive structure for a cooling tower fan, aiming to improve the problem that the replacement process of the permanent magnet is complicated and the magnetic isolation ring connection is a single-channel connection, which is likely to cause safety accidents if the connection fails.

[0005] The utility model is achieved in this way:

[0006] A cooling tower fan permanent magnet direct drive motor drive structure comprises a permanent magnet rotor core assembly, a follow-up rotation limit assembly and a rotating shaft assembly.

[0007] The rotation limit assembly includes an interpenetrating shaft cylinder, a limit retaining ring, an interpenetrating rod and a tightening nut. The limit retaining ring is provided in two pieces. The two limit retaining rings are connected to the two ends of the interpenetrating shaft cylinder by threads. The interpenetrating shaft cylinder passes through the center of the permanent magnet core assembly. The limit retaining ring blocks the two sides of the permanent magnet core assembly. The interpenetrating rod is evenly distributed along the circumference of the limit retaining ring. The interpenetrating rod passes through one of the limit retaining rings, the permanent magnet core assembly and the other limit retaining ring in turn. The tightening nuts are tightened to the two ends of the interpenetrating rod, and the tightening nuts are respectively pressed on the outside of the two limit retaining rings. The rotating shaft assembly is fixed through the interior of the interpenetrating shaft cylinder.

[0008] In a specific embodiment, the interpenetrating shaft cylinder member includes an interpenetrating shaft cylinder and a fixed flange, the fixed flange is fixedly connected to one end of the interpenetrating shaft cylinder, and the rotating shaft assembly is fixedly connected to the fixed flange after passing through the interpenetrating shaft cylinder.

[0009] In a specific embodiment, the inserted shaft cylinder includes a middle cylinder, a front externally threaded cylinder and a rear threaded cylinder, the front externally threaded cylinder and the rear threaded cylinder are respectively arranged at the front and rear ends of the middle cylinder, and the fixing flange is fixedly connected to the rear end of the rear threaded cylinder. The outer diameters of the front externally threaded cylinder, the middle cylinder and the rear threaded cylinder increase successively, and the two limit rings are respectively connected to the front externally threaded cylinder and the rear threaded cylinder by threads.

[0010] In a specific embodiment, the rotating shaft assembly includes a rotating shaft, a connecting flange and a fixing bolt. The connecting flange is fixedly sleeved on one end of the rotating shaft. The rotating shaft passes through the interpenetrating shaft tube. The connecting flange and the fixing flange are fixed to each other by the fixing bolt.

[0011] In a specific embodiment, the outer wall of the rotating shaft is provided with splines at equal intervals, the inner wall of the inserted shaft cylinder is provided with spline grooves at equal intervals, the splines are inserted into the spline grooves, and the splines and the spline grooves limit each other.

[0012] In a specific embodiment, the limit retaining ring component includes an inner connecting ring, an outer retaining ring, a limit connecting plate and a reinforcing plate. The inner connecting ring and the outer retaining ring are connected to each other through a plurality of limit connecting plates. The plurality of limit connecting plates are evenly distributed along the periphery of the inner connecting ring. The reinforcing plate is arranged at the connection between the limit connecting plate and the inner connecting ring. The insertion rod passes through the reinforcing plate. The tightening nut presses the reinforcing plate. The inner connecting ring is connected to both ends of the insertion shaft cylinder component by threads.

[0013] In a specific embodiment, the outer wall of the outer retaining ring is provided with fan blades.

[0014] In a specific embodiment, the permanent magnet rotor core assembly includes a rotor core, permanent magnets and magnetic isolation filler strips. The permanent magnets and the magnetic isolation filler strips are both inserted into the rotor core, and the magnetic isolation filler strips are located at both ends of the permanent magnets.

[0015] In a specific embodiment, the rotor core includes a rotor core body, a magnet mounting groove is provided around the rotor core body, the permanent magnet is inserted into the magnet mounting groove, magnetic isolation air grooves are provided at both ends of the magnet mounting grooves, the magnetic isolation filler strips are inserted into the magnetic isolation air grooves, a shaft cylinder hole is provided through the center of the rotor core body, and the inserted shaft cylinder member passes through the shaft cylinder hole.

[0016] In a specific embodiment, the shaft cylinder hole of the rotor core is circumferentially interspersed with insertion holes at equal intervals, a reinforcement cylinder is inserted into the insertion hole, and the insertion rod passes through the rotor core through the reinforcement cylinder.

[0017] The beneficial effect of the present application is that when the permanent magnet direct drive motor drive structure of the cooling tower fan is installed, the permanent magnet core assembly is assembled first, and then one of the limit retaining rings is threadedly sleeved on one end of the interpenetrating shaft cylinder, and the other end of the interpenetrating shaft cylinder passes through the permanent magnet core assembly, and the limit retaining ring blocks one side of the permanent magnet core assembly, and then another limit retaining ring is threadedly sleeved on the interpenetrating shaft cylinder, and the other limit retaining ring blocks the other side of the permanent magnet core assembly, and finally, the interpenetrating rod passes through the two limit retaining rings and the permanent magnet core assembly, and the two ends of the interpenetrating rod are screwed on and tightened with nuts, and the two limit retaining rings are tightened with the tightening nuts, and finally the rotating shaft assembly is installed. When disassembling the structure on the permanent magnet core assembly, unscrew the tightening nut, and then remove one of the limit rings, and then the inserted shaft cylinder can be pulled out, so that both sides of the permanent magnet core assembly are open for replacement. First, the assembly structure is adopted, and the replacement process is simple. Second, the limit ring is tightened by threads and tightening nuts to form two connections. If the threaded connection fails, the inserted rod and tightening nut can still maintain the fixing effect of the limit ring, reducing the occurrence of safety accidents caused by the failure of the connection of the limit ring. When the permanent magnet core assembly rotates, the limit ring and the inserted shaft cylinder can be driven to rotate by the limit of the inserted rod. The shaft assembly rotates with the inserted shaft cylinder to form the drive output of the permanent magnet motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the permanent magnet direct drive motor driving structure of the cooling tower fan provided by the embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the three-dimensional structure of a rotation limit assembly is provided for an embodiment of the present utility model;

[0021] Figure 3 A schematic diagram of the three-dimensional structure of the interlaced shaft cylinder is provided for the embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the three-dimensional structure of the shaft assembly is provided for the embodiment of the present utility model;

[0023] Figure 5 A schematic diagram of the three-dimensional structure of a position limiting retaining ring is provided for an embodiment of the present utility model;

[0024] Figure 6 A schematic diagram of the three-dimensional structure of a permanent magnet core assembly is provided for an embodiment of the present utility model;

[0025] Figure 7 A schematic diagram of the three-dimensional structure of the rotor core is provided for an embodiment of the present utility model.

[0026] In the figure: 100-permanent magnet core assembly; 110-rotor core; 111-rotor core body; 112-magnet mounting slot; 113-magnetic isolation air slot; 114-shaft cylinder hole; 115-through hole; 120-permanent magnet; 130-magnetic isolation filler strip; 140-reinforcement cylinder; 200-rotation limit assembly; 210-through shaft cylinder member; 211-through shaft cylinder; 2111-middle cylinder; 2112-front outer Threaded barrel; 2113-rear threaded barrel; 212-spline groove; 213-fixing flange; 220-limiting retaining ring; 221-inner connecting ring; 222-outer retaining ring; 223-limiting connecting plate; 224-reinforcement plate; 225-fan blade; 230-through rod; 240-tightening nut; 300-rotating shaft assembly; 310-rotating shaft; 320-connecting flange; 330-fixing bolt; 340-spline. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example

[0029] See also Figures 1 to 7 The utility model provides a cooling tower fan permanent magnet direct drive motor drive structure, including a permanent magnet core assembly 100, a rotation limit assembly 200 and a shaft assembly 300.

[0030] See also Figures 1 to 2 The rotation limit assembly 200 includes an interpenetrating shaft cylinder part 210, a limit retaining ring part 220, an interpenetrating rod 230 and a tightening nut 240. The limit retaining ring part 220 is provided in two, and the two limit retaining ring parts 220 are connected to the two ends of the interpenetrating shaft cylinder part 210 by threads. The interpenetrating shaft cylinder part 210 passes through the center of the permanent magnet rotating core assembly 100, and the limit retaining ring part 220 blocks both sides of the permanent magnet rotating core assembly 100. The interpenetrating rod 230 is evenly distributed along the circumference of the limit retaining ring part 220. The interpenetrating rod 230 passes through one of the limit retaining ring parts 220, the permanent magnet rotating core assembly 100 and the other limit retaining ring part 220 in turn, and the tightening nut 240 is tightened to both ends of the interpenetrating rod 230. The tightening nuts 240 are respectively pressed against the outside of the two limit retaining ring parts 220, and the rotating shaft assembly 300 is fixed through the inside of the interpenetrating shaft cylinder part 210. When the permanent magnet direct drive motor drive structure of the cooling tower fan is installed, the permanent magnet core assembly 100 is assembled first, and then one of the limit retaining rings 220 is threadedly sleeved on one end of the inserted shaft cylinder 210, and the other end of the inserted shaft cylinder 210 passes through the permanent magnet core assembly 100, and the limit retaining ring 220 blocks one side of the permanent magnet core assembly 100, and then another limit retaining ring 220 is threadedly sleeved on the inserted shaft cylinder 210, and the other limit retaining ring 220 blocks the other side of the permanent magnet core assembly 100, finally, the insertion rod 230 is passed through the two limit retaining rings 220 and the permanent magnet core assembly 100, and the two ends of the insertion rod 230 are screwed on and tightened with nuts 240, and the two limit retaining rings 220 are tightened with the tightening nuts 240, and finally the rotating shaft assembly 300 is installed. When the structure on the permanent magnet core assembly 100 is disassembled, unscrew the tightening nut 240, and then remove one of the limit rings 220, and then the inserted shaft cylinder 210 can be pulled out, so that the two sides of the permanent magnet core assembly 100 are opened for easy replacement. First, the assembly structure is adopted, and the replacement process is simple. Second, the limit ring 220 uses a thread and a tightening nut 240 to form two connections. If the threaded connection fails, the insertion rod 230 and the tightening nut 240 can still maintain the fixing effect of the limit ring 220, reducing the occurrence of safety accidents caused by the failure of the connection of the limit ring 220. When the permanent magnet core assembly 100 rotates, the limit ring 220 and the inserted shaft cylinder 210 can be driven to rotate by the limit of the insertion rod 230, and the shaft assembly 300 rotates with the inserted shaft cylinder 210 to form the power output of the permanent magnet motor.

[0031] See also Figures 1 to 3The interpenetrating shaft cylinder member 210 includes an interpenetrating shaft cylinder 211 and a fixed flange 213. The fixed flange 213 is fixedly connected to one end of the interpenetrating shaft cylinder 211. The rotating shaft assembly 300 passes through the interpenetrating shaft cylinder 211 and is fixedly connected to the fixed flange 213. The fixed flange 213 and the interpenetrating shaft cylinder 211 are connected together, and the fixed flange 213 rotates with the interpenetrating shaft cylinder 211. The rotating shaft assembly 300 and the fixed flange 213 are fixed to each other, and the rotating shaft assembly 300 rotates with the fixed flange 213. The inserted shaft cylinder 211 includes a middle cylinder 2111, a front externally threaded cylinder 2112 and a rear threaded cylinder 2113. The front externally threaded cylinder 2112 and the rear threaded cylinder 2113 are respectively arranged at the front and rear ends of the middle cylinder 2111. The fixing flange 213 is fixedly connected to the rear end of the rear threaded cylinder 2113. The outer diameters of the front externally threaded cylinder 2112, the middle cylinder 2111 and the rear threaded cylinder 2113 increase successively. The two limit rings 220 are respectively connected to the front externally threaded cylinder 2112 and the rear threaded cylinder 2113 by threads. After one of the limit rings 220 passes over the front external threaded cylinder 2112 and the middle cylinder 2111 in sequence, the limit ring 220 is connected to the rear threaded cylinder 2113 through a thread, and the middle cylinder 2111 is passed through the permanent magnet core assembly 100, and the other limit ring 220 is connected to the front external threaded cylinder 2112 through a thread.

[0032] See also Figures 1 to 4 The rotating shaft assembly 300 includes a rotating shaft 310, a connecting flange 320, and a fixing bolt 330. The connecting flange 320 is fixedly sleeved on one end of the rotating shaft 310. The rotating shaft 310 passes through the through-tube 211. The connecting flange 320 and the fixing flange 213 are fixed to each other by the fixing bolt 330. The connecting flange 320 and the fixing flange 213 are installed and removed by the fixing bolt 330. The connecting flange 320 rotates with the fixing flange 213, driving the rotating shaft 310 to rotate, and power is output through the rotation of the rotating shaft 310. Splines 340 are arranged at equal intervals on the outer wall of the rotating shaft 310, and spline grooves 212 are arranged at equal intervals on the inner wall of the through-tube 211. The splines 340 are inserted into the spline grooves 212, and the splines 340 and the spline grooves 212 are mutually limited. While the inserted shaft cylinder 211 is connected and rotated between the connecting flange 320 and the fixed flange 213, the rotating shaft 310 and the inserted shaft cylinder 211 are rotated through the limited transmission between the spline 340 and the spline groove 212, thereby reducing the force at the connection between the connecting flange 320 and the fixed flange 213, and reducing the occurrence of connection failure of the fixing bolt 330.

[0033] See also Figures 1 to 5The limiting retaining ring 220 includes an inner connecting ring 221, an outer retaining ring 222, a limiting connecting plate 223 and a reinforcing plate 224. The inner connecting ring 221 and the outer retaining ring 222 are connected to each other through multiple limiting connecting plates 223. Multiple limiting connecting plates 223 are evenly distributed along the periphery of the inner connecting ring 221. The reinforcing plate 224 is arranged at the connection between the limiting connecting plate 223 and the inner connecting ring 221. The insertion rod 230 passes through the reinforcing plate 224, and the nut 240 is tightened to compress the reinforcing plate 224. The inner connecting ring 221 is connected to both ends of the insertion shaft cylinder 210 by threads. The inner connecting ring 221, the outer retaining ring 222 and the limiting connecting plate 223 are connected as a whole. The outer retaining ring 222 and the limiting connecting plate 223 can limit the structure of the plug-in connection in the permanent magnet core assembly 100. The reinforcing plate 224 is used to strengthen the structure at the connection between the limiting connecting plate 223 and the inner connecting ring 221. The reinforcing plates 224 on the two inner connecting rings 221 are tightened and fixed by the insertion rod 230 and the tightening nut 240. The outer wall of the outer retaining ring 222 is provided with fan blades 225. The permanent magnet core assembly 100 drives the inner connecting ring 221 and the outer retaining ring 222 to rotate through the insertion rod 230. The rotation of the outer retaining ring 222 drives the fan blades 225. The fan blades 225 form a gas flow, which facilitates the conduction and heat dissipation of the permanent magnet core assembly 100.

[0034] See also Figures 1 to 6 The permanent magnet rotor core assembly 100 includes a rotor core 110, permanent magnets 120, and magnetic isolation filler strips 130. Both the permanent magnets 120 and magnetic isolation filler strips 130 are inserted into the rotor core 110, with the magnetic isolation filler strips 130 located at both ends of the permanent magnets 120. The permanent magnets 120 cooperate with the stator of the permanent magnet motor, using magnetic attraction to pull the rotor core 110 to rotate. The magnetic isolation filler strips 130 reduce magnetic leakage.

[0035] See also Figures 1 to 7 The rotor core 110 includes a rotor core body 111. Magnet mounting slots 112 are provided around the rotor core body 111. Permanent magnets 120 are inserted into the magnet mounting slots 112. Magnetic isolation air slots 113 are provided at both ends of the magnet mounting slots 112. Magnetic isolation filler strips 130 are inserted into the magnetic isolation air slots 113. A shaft cylinder hole 114 is provided through the center of the rotor core body 111. The insertion shaft cylinder member 210 passes through the shaft cylinder hole 114. The magnet mounting slots 112 and the magnetic isolation air slots 113 facilitate the installation of the permanent magnets 120 and the magnetic isolation filler strips 130. The shaft cylinder hole 114 of the rotor core 110 is interspersed with insertion holes 115 at equal intervals along the circumference. A reinforcing cylinder 140 is inserted into the insertion hole 115. The insertion rod 230 passes through the rotor core 110 through the reinforcing cylinder 140. The rotor core body 111 is made of stacked silicon steel sheets. The insertion rod 230 contacts the rotor core body 111 through the reinforcement tube 140 , so as to disperse the pressure of the silicon steel sheets on the rotor core body 111 on the insertion rod 230 .

[0036] Specifically, the working principle of the permanent magnet direct drive motor driving structure of the cooling tower fan is as follows: during installation, the permanent magnet 120 is inserted into the magnet installation groove 112, and the magnetic isolation filler strip 130 is inserted into the magnetic isolation air groove 113. After the inner connecting ring 221 of one of the limit stop rings 220 passes over the front external threaded cylinder 2112 and the middle cylinder 2111 in turn, the inner connecting ring 221 is sleeved on the rear threaded cylinder 2113 through a thread, and the middle cylinder 2111 is passed through the shaft cylinder hole 114. The inner connecting ring 221 of the other limit stop ring 220 is sleeved on the front external threaded cylinder 2112 through a thread, and the insertion rod 230 passes through the reinforcing plates 224 and the reinforcing cylinder 140 on the two inner connecting rings 221, and then the inner connecting ring 221 is tightened by the tightening nut 240. The inner connecting ring 221, the outer retaining ring 222 and the limit connecting plate 2 23 are connected as a whole, the outer retaining ring 222 and the limiting connecting plate 223 can limit the permanent magnet 120 and the magnetic isolation filler strip 130, the rotating shaft 310 passes through the front external threaded cylinder 2112, the middle cylinder 2111 and the rear threaded cylinder 2113, and the spline 340 of the rotating shaft 310 is inserted into the spline groove 212 in the front external threaded cylinder 2112, the middle cylinder 2111 and the rear threaded cylinder 2113. The connecting flange 320 and the fixing flange 213 are fixed by fixing bolts 330, and the rotation is transmitted by the limiting position between the spline 340 and the spline groove 212, thereby reducing the force at the connection between the connecting flange 320 and the fixing flange 213, and reducing the occurrence of connection failure of the fixing bolts 330. At the same time, the fixing bolts 330 of the connecting flange 320 and the fixing flange 213 are released, and the rotating shaft 310 can be removed. When disassembling the structure on the permanent magnet core assembly 100, unscrew the tightening nut 240, and then remove one of the limit rings 220, and then pull out the inserted shaft cylinder 210, so that the two sides of the permanent magnet core assembly 100 are open, which is convenient for replacing the permanent magnet 120 and the magnetic isolation filler strip 130. When replacing the permanent magnet 120 and the magnetic isolation filler strip 130, there is no need to remove the rotating shaft 310. The cooling tower fan permanent magnet direct drive motor drive structure: first, it adopts an assembled structure, and the replacement process is simple. Second, the limit ring 220 uses a thread and a tightening nut 240 to form two connections. If the threaded connection fails, the inserted rod 230 and the tightening nut 240 can still maintain the fixing effect of the limit ring 220, reducing the occurrence of safety accidents caused by the failure of the connection of the limit ring 220. The permanent magnet 120 on the rotor core 110 cooperates with the stator of the permanent magnet motor, and uses magnetic attraction to pull the rotor core 110 to rotate. The limit ring 220 and the inserted shaft cylinder 210 can be driven to rotate through the limit of the inserted rod 230. The rotating shaft assembly 300 rotates with the inserted shaft cylinder 210 to form the power output of the permanent magnet motor.

[0037] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A cooling tower fan permanent magnet direct drive motor drive structure, characterized in that: include Permanent magnet core assembly; The rotation limit assembly comprises an interpenetrating shaft cylinder, a limit retaining ring, an interpenetrating rod and a tightening nut, wherein the limit retaining ring is provided with two, and the two limit retaining rings are connected to the two ends of the interpenetrating shaft cylinder by threads, and the interpenetrating shaft cylinder passes through the center of the permanent magnet core assembly, and the limit retaining ring blocks the two sides of the permanent magnet core assembly, and the interpenetrating rod is evenly distributed along the circumference of the limit retaining ring, and the interpenetrating rod sequentially passes through one of the limit retaining rings, the permanent magnet core assembly and the other limit retaining ring, and the tightening nuts are tightened to the two ends of the interpenetrating rod, and the tightening nuts are respectively pressed against the outsides of the two limit retaining rings; A rotating shaft assembly is fixedly inserted into the interior of the interpenetrating shaft cylinder.

2. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 1, characterized in that: The interpenetrating shaft cylinder member includes an interpenetrating shaft cylinder and a fixing flange. The fixing flange is fixedly connected to one end of the interpenetrating shaft cylinder. The rotating shaft assembly passes through the interpenetrating shaft cylinder and is fixedly connected to the fixing flange.

3. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 2, characterized in that: The inserted shaft cylinder includes a middle cylinder, a front externally threaded cylinder and a rear threaded cylinder. The front externally threaded cylinder and the rear threaded cylinder are respectively arranged at the front and rear ends of the middle cylinder. The fixing flange is fixedly connected to the rear end of the rear threaded cylinder. The outer diameters of the front externally threaded cylinder, the middle cylinder and the rear threaded cylinder increase successively. The two limit rings are respectively connected to the front externally threaded cylinder and the rear threaded cylinder by threads.

4. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 2, characterized in that: The rotating shaft assembly includes a rotating shaft, a connecting flange and fixing bolts. The connecting flange is fixedly sleeved on one end of the rotating shaft. The rotating shaft passes through the interpenetrating shaft cylinder. The connecting flange and the fixing flange are fixed to each other by the fixing bolts.

5. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 4, characterized in that: The outer wall of the rotating shaft is provided with splines at equal intervals, and the inner wall of the inserted shaft cylinder is provided with spline grooves at equal intervals. The splines are inserted into the spline grooves, and the splines and the spline grooves limit each other.

6. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 1, characterized in that: The limit retaining ring component includes an inner connecting ring, an outer retaining ring, a limit connecting plate and a reinforcing plate. The inner connecting ring and the outer retaining ring are connected to each other through multiple limit connecting plates. Multiple limit connecting plates are evenly distributed along the periphery of the inner connecting ring. The reinforcing plate is arranged at the connection between the limit connecting plate and the inner connecting ring. The insertion rod passes through the reinforcing plate. The tightening nut presses the reinforcing plate. The inner connecting ring is connected to both ends of the insertion shaft cylinder component by threads.

7. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 6, characterized in that: The outer wall of the outer retaining ring is provided with fan blades.

8. The cooling tower fan permanent magnet direct drive motor drive structure according to claim 1, characterized in that: The permanent magnet core assembly includes a rotor core, permanent magnets and magnetic isolation filler strips. The permanent magnets and the magnetic isolation filler strips are both inserted into the rotor core, and the magnetic isolation filler strips are located at both ends of the permanent magnets.

9. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 8, characterized in that: The rotor core includes a rotor core body, a magnet mounting groove is provided around the rotor core body, the permanent magnet is inserted into the magnet mounting groove, magnetic isolation air grooves are provided at both ends of the magnet mounting grooves, the magnetic isolation filler strips are inserted into the magnetic isolation air grooves, a shaft cylinder hole is provided through the center of the rotor core body, and the inserted shaft cylinder member passes through the shaft cylinder hole.

10. A cooling tower fan permanent magnet direct drive motor drive structure according to claim 9, characterized in that: The shaft cylinder hole of the rotor core is circumferentially interspersed with insertion holes at equal intervals, a reinforcement cylinder is inserted into the insertion hole, and the insertion rod passes through the rotor core through the reinforcement cylinder.

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