Anti-impact pod propulsion motor stator structure

Abstract

A shock-resistant pod propulsion motor stator structure disclosed by the present invention comprises a self-adhesive stator punching sheet assembly, a stator frame assembly and a positioning block assembly, the self-adhesive stator punching sheet assembly is formed by self-adhesive silicon steel sheets and stator punching sheets through hot pressing, and the stator frame assembly comprises an end pressing plate, a tensioning screw rod and a spacer ring. The positioning block assembly is composed of a positioning block and an iron core welding block. The self-adhesive stator punching sheet assembly is connected with the end pressing plate through the positioning block. The invention further discloses an assembling method of the device. By adopting the novel impact-resistant stator structure, better structural integrity can be achieved, and better impact resistance of the pod propeller stator can be guaranteed; and meanwhile, the heat dissipation performance is improved, and the assembly difficulty is reduced.

Description

Technical Field

[0001] The invention belongs to the field of propeller application, and in particular relates to a stator structure of an axial radial ventilation anti-shock pod propulsion motor. Background Art

[0002] To meet the application requirements of icebreaking and severe sea conditions, the stator of the pod's propulsion motor needs to bear a larger impact load, and the heat dissipation performance also needs to be improved.

[0003] The stator core of the conventional pod propulsion motor with axial radial ventilation cooling adopts a stator frame assembly welded to the outer circle of the stator core, and cooperates with the tensioning screw to generate overlapping friction; at the same time, this friction makes the stator punching, stator ventilation slot plate, and stator end pressure plate fit tightly to achieve limit positioning; the teeth of the stator punching of this structure are difficult to compact (easy to form gaps), the impact resistance is weak, and it is easy to vibrate.

[0004] In addition, when the punching sheets are stacked, they are stacked in a cross-cycle manner, and additional positioning blocks (such as outer or inner circle molds, etc.) are required during the stacking process, which leads to a long stacking cycle and complicated procedures. Moreover, the wind resistance formed by the ventilation slots of the ventilation slot plate at the teeth is not conducive to improving the heat dissipation performance of the motor. Summary of the invention

[0005] The purpose of the present invention is to overcome the above difficulties and provide a new type of impact-resistant pod propulsion motor stator structure to improve the integrity of its structure and ensure that the pod propulsion motor stator has better impact resistance. At the same time, by removing the ventilation slot plate, the stator axial spacing structure is improved, which is beneficial to reduce the wind resistance of the axial wind path of the stator core and improve the heat dissipation performance.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an impact-resistant pod propulsion motor stator structure, including a stator frame assembly and a self-adhesive stator punching assembly stacked and assembled in the stator frame assembly through a positioning block assembly; the self-adhesive stator punching assembly is formed by stamping a single piece of self-adhesive silicon steel sheet and a stator punching sheet using a heated stacking die, the outer circle of the self-adhesive silicon steel sheet and the stator punching sheet is provided with a guide hole, and the self-adhesive stator punching sheet assembly is provided with a ventilation groove; the stator frame assembly includes an end pressure plate, a tensioning screw and a spacer ring, a frame nut, and a locking gasket, the thickness of the spacer ring being equal to the width of the ventilation groove, and the tightening screw passing through the guide hole and the spacer ring; the positioning block assembly is composed of a positioning block with pins at both ends and a core welding block, the self-adhesive stator punching assembly is connected to the end pressure plate through the positioning block, and the thickness of the middle part of the positioning block is equal to the width of the ventilation groove; the self-adhesive silicon steel sheet, stator punching sheet and end pressure plate are all provided with positioning pin holes with an inner diameter of 8 to 12 mm in the same number and position, and the pins and positioning pin holes are transitionally matched.

[0007] Furthermore, the thickness of the self-adhesive silicon steel sheet is 0.35-0.5 mm, the thickness of the stator punching sheet is 1 mm, and the self-adhesive silicon steel sheet and the stator punching sheet can adopt a full circle or a petal structure.

[0008] Furthermore, the number of positioning pin holes n on each stator punching sheet = the number of stator poles / the number of petals of the stator punching sheet.

[0009] Furthermore, the stator frame assembly further comprises annular ribs and longitudinal ribs, and the longitudinal ribs of adjacent self-adhesive stator punching sheet assemblies and stator frame assemblies are symmetrically staggered welded.

[0010] The present invention has the following beneficial effects: 1. The present invention adopts self-adhesive silicon steel sheets and stator punching sheets to complete the prefabrication of the axially segmented core assembly in advance, so that the original serial assembly process of the segmented stacking of the stator of the pod propulsion motor is changed to a synchronous and parallel implementation of multiple self-adhesive stator punching sheet assemblies, saving process time. At the same time, the stator punching sheets and the positioning pin holes on the stator punching sheets can realize the effective positioning and limiting of the punching sheets and the end pressure plates during assembly and connection.

[0011] 2. The connection between the positioning block and the pin hole in the positioning block assembly strengthens the integrity of the core. At the same time, the welding of the core welding block and the adjacent core strengthens the strength and rigidity of the core and improves the impact resistance of the core. In addition, the self-adhesiveness of the core also helps prevent vibration problems caused by loose installation of the teeth of the stator core.

[0012] 3. In the positioning block assembly, only the outer circle of the core partially blocks the wind path. The ventilation slots between the core segments are removed, and the wind resistance is greatly reduced, which is beneficial to the improvement of the heat dissipation performance of the motor stator. The pins in the positioning block are separated by a magnetic pole to ensure the equipotential of the pins and avoid the circulating current formed by electromagnetic field induction.

[0013] 4. The assembly method proposed in the present invention improves the operability of the propulsion motor stator, is beneficial to improving the work efficiency of the pod propulsion motor stator during assembly, and reduces the process difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the present invention; Figure 2 A top view of the present invention; Figure 3 and Figure 4 Schematic diagram of step S1 of the assembly method of the present invention; Figure 5 , Figure 6 , Figure 7 and Figure 8 is a schematic diagram of step S2 of the assembly method of the present invention; Fig. 9 and Fig.10is a schematic diagram of step S3 of the assembly method of the present invention; Fig.11 and Fig.12 It is a schematic diagram of step S3 of the assembly method of the present invention.

[0015] The figures are marked as follows: 1—self-adhesive silicon steel sheet, 2—stator punching sheet, 3—end pressure plate; 4—annular ribs, 5—longitudinal ribs, 6—tensioning screws, 7—spacer rings, 8—frame nuts, 9—anti-loosening washers, 10—positioning blocks, 11—positioning nuts, 12—anti-loosening washers, 13—core welding blocks. DETAILED DESCRIPTION

[0016] The present invention is further described in detail with reference to the accompanying drawings and embodiments as follows. Example 1

[0017] like Figure 1 , Figure 2 As shown, the present invention discloses an impact-resistant pod propulsion motor stator structure. The stator core of the pod propulsion motor of this structure adopts an axial radial ventilation stator structure. This new structure has better structural integrity, which can ensure that the pod propeller stator has better impact resistance; at the same time, it improves its heat dissipation performance and reduces the difficulty of assembly. It is assembled by a combination of three parts: a self-adhesive stator punching sheet assembly, a stator frame assembly and a positioning block assembly. The positioning block assembly is used to maintain the connection and limit the adjacent self-adhesive stator punching sheet assemblies, and the stator frame assembly is used to constrain and limit the stator core as a whole. The self-adhesive stator punching sheet assembly is assembled in the stator frame assembly by stacking the positioning block assembly. The use of this new impact-resistant stator structure can have better structural integrity, which can ensure that the pod propeller stator has better impact resistance; at the same time, it improves its heat dissipation performance and reduces the difficulty of assembly.

[0018] The self-adhesive stator punching assembly is formed by stamping a single self-adhesive silicon steel sheet 1 and a stator punching sheet 2 using the same heated lamination die. The thickness of the self-adhesive silicon steel sheet 1 is 0.35-0.5 mm, and the thickness of the stator punching sheet 2 is 1 mm. The self-adhesive silicon steel sheet 1 and the stator punching sheet 2 can adopt a full circle or a petal structure according to the motor design. According to the design requirements, they can adopt straight grooves or parallel inclined grooves. The outer circles of the self-adhesive silicon steel sheet 1 and the stator punching sheet 2 are provided with guide holes, and the self-adhesive stator punching assembly is provided with ventilation grooves.

[0019] The stator frame assembly comprises an end pressure plate 3, a tightening screw 6, a spacer ring 7, a frame nut 8 and a locking gasket 9. The thickness of the spacer ring 7 is equal to the width of the ventilation groove, and the tightening screw 6 passes through the guide hole.

[0020] The positioning block assembly is composed of a positioning block 10 and a core welding block 13. Pins are provided at both ends of the positioning block 10. The self-adhesive stator punching assembly is connected to the end pressure plate 3 through the positioning block 10. The thickness of the middle part of the positioning block 10 is equal to the width of the ventilation groove. The self-adhesive silicon steel sheet 1, the stator punching 2 and the end pressure plate 3 are all provided with the same number and position of positioning pin holes with an inner diameter of 8 to 12 mm. The pins and the positioning pin holes are transitionally matched. The positioning block assembly uses the pins of the positioning block 10 to realize radial constraints and limit between the end pressure plate 3 and the self-adhesive stator punching assembly and the self-adhesive stator punching assembly. At the same time, the pins with threads can cooperate with the frame nuts 8 and the anti-loosening washers 9 to realize the constraints and limit in the axial direction. Finally, the structural reinforcement of the adjacent cores (or the cores and the end pressure plates) is realized by symmetrically staggered welding of the core welding block and the core (or the end pressure plate) in the positioning block assembly.

[0021] The number of positioning pin holes n on each stator punching sheet 2 = the number of stator poles / the number of stator punching petals. The length of the pin is equal to the self-adhesive stator punching sheet assembly or the stator end pressure plate; the thread length at the end of the pin is greater than the sum of the thickness of the frame nut 8 and the anti-loosening gasket 9, but less than the width of the ventilation groove; when the stator frame assembly is assembled with the stacked self-adhesive stator punching sheet assembly, the number of positioning block assemblies placed between the self-adhesive stator punching sheet assemblies is half the number of positioning pin holes. Example 2

[0022] The difference between this embodiment and embodiment 1 is that the stator frame assembly further includes annular ribs 4 and longitudinal ribs 5, and the adjacent self-adhesive stator punching assembly and the longitudinal ribs of the stator frame assembly are symmetrically staggered welded 5. The stator frame assembly uses a tightening screw 6 in conjunction with a frame nut 8 and a locking gasket 9 to achieve axial constraint and position limiting, while the symmetrical staggered welding of the longitudinal ribs 5 and the cores achieves structural reinforcement between adjacent cores. Example 3

[0023] This embodiment discloses an assembly method of an impact-resistant pod propulsion motor stator structure to improve the operability and assembly efficiency of the propulsion motor stator and reduce the process difficulty, and includes the following steps.

[0024] S1, the self-adhesive silicon steel sheet 1 and the stator punching sheet 2 are heated and molded into a segmented core by means of a tool according to the designed axial segment length to obtain a self-adhesive stator punching sheet assembly. Figure 3 and Figure 4 As shown, the positioning block assemblies in the ventilation grooves of each section of the self-adhesive stator punching assembly are cross-interlaced and staggered.

[0025] S2, place the end pressure plate 3 at the bottom, insert the pin of the positioning block 10 into the positioning pin hole of the self-adhesive silicon steel sheet 1, stator punching sheet 2 and end pressure plate 3, apply overlapping pressure to the end surface and tighten it, insert the pin into the end of the end pressure plate 3 and assemble it firmly with the positioning nut 11 and anti-loosening gasket 12, then pass the tensioning screw 6 through the reserved hole on the end pressure plate 3 and install the frame nut 8 and anti-loosening gasket 9 in the passing part, and insert the spacer ring 7 on the tensioning screw 6, and repeat the operation until all the self-adhesive stator punching components are assembled. Figure 5 , Figure 6 , Figure 7 and Figure 8 shown.

[0026] S3, install the remaining positioning pin holes of the self-adhesive silicon steel sheet 1 and the stator punching sheet 2 in the last self-adhesive stator punching assembly that are not equipped with pins into the pins of the positioning block 10, and firmly assemble them with the positioning nut 11 and the anti-loosening gasket 12 at the end of the pin, and at the same time insert the spacer ring 7 into the tensioning screw 6, and then install the positioning pin holes of the two end pressure plates 3 into the pins of the positioning block 10, and after passing through the end pressure plate 3, apply overlapping pressure to the bottom end surface to tighten it, and then firmly assemble it with the positioning nut 11 and the anti-loosening gasket 12 - the overlapping pressure is maintained during assembly, thereby completing the firm assembly of the frame nuts 8 and the anti-loosening gasket 9 at the end of the end pressure plates 3 at both ends; Fig. 9 and Fig.10 shown.

[0027] S4, while the end pressure plate 3 maintains the stacking pressure, complete the symmetrical and staggered welding of the core welding block 13 in the positioning block assembly and the stator punching sheet 2 or the end pressure plate 3, the symmetrical and staggered welding of the longitudinal ribs 5 and the stator punching sheet 2, the welding of the longitudinal ribs 5 and the annular ribs 4, and the welding of the longitudinal ribs 5 and the end pressure plate 3; after welding and cleaning, remove the stacking pressure, and use the tooling to complete the processing of the outer circle of the stator core to facilitate its assembly with the motor housing. Fig.11 and Fig.12 shown.

[0028] The axial radially ventilated stator core assembled by the above assembly method uses self-adhesive silicon steel sheets to achieve positioning and limiting between cores; uses positioning block assemblies to achieve constraint and limiting between segmented cores; and uses stator frame assemblies to achieve overall connection, compression and limiting of all cores. This new impact-resistant stator structure can have better structural integrity, which can ensure that the pod thruster stator has better impact resistance; at the same time, it improves its heat dissipation performance and reduces assembly difficulty.

[0029] The above description is a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An impact-resistant pod propulsion motor stator structure, comprising a stator frame assembly and a self-adhesive stator punching assembly assembled in the stator frame assembly by stacking and pressing a positioning block assembly; characterized in that: The self-adhesive stator punching assembly is made of a self-adhesive silicon steel sheet (1) and a stator punching sheet (2) by hot pressing. The outer circumferences of the self-adhesive silicon steel sheet (1) and the stator punching sheet (2) are provided with guide holes, and the self-adhesive stator punching assembly is provided with a ventilation groove; the stator frame assembly comprises an end pressure plate (3), a tensioning screw (6) passing through the guide hole, and a spacer ring (7) sleeved on the tensioning screw (6), and the thickness of the spacer ring (7) is equal to the width of the ventilation groove; the positioning block assembly is composed of a positioning block (10) with pins at both ends and an iron core welding block (13), and the self-adhesive stator punching assembly is connected to the end pressure plate (3) through the positioning block (10), and the thickness of the middle part of the positioning block (10) is equal to the width of the ventilation groove; the self-adhesive silicon steel sheet (1), the stator punching sheet (2) and the end pressure plate (3) are all provided with positioning pin holes with an inner diameter of 8 to 12 mm, and the pins are transitionally matched with the positioning pin holes.

2. The shock-resistant pod propulsion motor stator structure according to claim 1 is characterized in that: The thickness of the self-adhesive silicon steel sheet (1) is 0.35-0.5 mm, the thickness of the stator punching sheet (2) is 1 mm, and the self-adhesive silicon steel sheet (1) and the stator punching sheet (2) adopt a full circle or a split petal structure.

3. The shock-resistant pod propulsion motor stator structure according to claim 2 is characterized in that: The number of positioning pin holes of the stator punching sheet (2) is n=the number of stator poles / the number of petals of the stator punching sheet.

4. The shock-resistant pod propulsion motor stator structure according to claim 1, 2 or 3, characterized in that: The stator frame assembly further comprises annular ribs (4) and longitudinal ribs (5), and the longitudinal ribs of adjacent self-adhesive stator punching assemblies and stator frame assemblies are symmetrically staggered welded.

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