Offshore wind power rotor magnetic pole box and overlying forming system and method thereof

Abstract

The invention belongs to the technical field of wind driven generators, and particularly relates to an offshore wind power rotor magnetic pole box and an overlying forming system and method thereof. The magnetic pole box is reasonable in structural design, the axial ventilation holes I are additionally formed in the magnetic pole box section I, the axial ventilation holes II and the radial ventilation holes communicated with the axial ventilation holes II are additionally formed in the magnetic pole box section II, and in this way, heat in the magnetic pole box is rapidly transferred through a heat dissipation channel formed by the axial ventilation holes I, the axial ventilation holes II and the radial ventilation holes; and rapid heat dissipation is realized. Meanwhile, the edge of the axial ventilation hole I / the axial ventilation hole II is provided with a lock plate I / a lock plate II which are staggered in position, and the lock plate I / the lock plate II is stamped and bent, so that an L-shaped pinch plate structure which locks the silicon steel sheet where the lock plate I / the lock plate II is located and the adjacent silicon steel sheet into a whole can be formed, and the mode is used for replacing an adhesive for bonding and fixing; and the magnetic overlying coefficient of the magnetic pole box is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbines, and particularly relates to an offshore wind power rotor pole box and its lamination forming system and method. Background Art

[0002] With the gradual increase of the installed capacity of wind turbines, the demand for high-power wind turbines is increasing, and it is becoming a research and development hotspot at home and abroad. Among many types of wind turbines, permanent magnet wind turbines have become the representatives of the new generation of wind turbines due to their characteristics of light weight, small volume, low cost, high efficiency, and small maintenance volume. The pole box is a key component of the permanent magnet motor and has a good fixing and protecting effect on the permanent magnet.

[0003] Deficiencies have been found in the existing offshore wind power rotor pole boxes during use. First, between the laminated silicon steel sheets, glue bonding is required, and the magnetic lamination coefficient of the pole box laminated in this way is relatively low; second, it does not have a heat dissipation channel, and the heat dissipation effect is relatively poor.

[0004] Therefore, it is necessary to optimize and improve the existing offshore wind power rotor pole box. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above problems existing in the traditional technology and provide an offshore wind power rotor pole box and its lamination forming system and method.

[0006] To achieve the above technical purposes and reach the above technical effects, the present invention is realized through the following technical solutions:

[0007] An offshore wind power rotor pole box, which is composed of a plurality of alternately distributed pole box segments I and pole box segments II;

[0008] The pole box segment I is laminated by a plurality of alternately distributed first silicon steel sheets and second silicon steel sheets;

[0009] The pole box segment II is laminated by a plurality of alternately distributed third silicon steel sheets and fourth silicon steel sheets;

[0010] Axial ventilation holes I are provided in the pole box segment I, axial ventilation holes II and radial ventilation holes communicating therewith are provided in the pole box segment II, and the positions of the axial ventilation holes II correspond to and communicate with those of the axial ventilation holes I;

[0011] The heat inside the pole box is quickly dissipated through the heat dissipation channel composed of the axial ventilation holes I, the axial ventilation holes II and the radial ventilation holes.

[0012] Further, in the above-mentioned offshore wind power rotor pole box, the first silicon steel sheet and the second silicon steel sheet each include an arc-shaped punching sheet I. An anti-disengagement protrusion I for facilitating connection with the yoke is provided at the inner arc edge of the arc-shaped punching sheet I. A clamping protrusion I is provided at one end of the arc-shaped punching sheet I, and a clamping groove I cooperating with the clamping protrusion I is formed at the other end of the arc-shaped punching sheet I. Permanent magnet mounting holes I are symmetrically formed at positions close to the outer arc edge of the arc-shaped punching sheet I, and closed ventilation grooves are symmetrically formed at positions close to the inner arc edge of the arc-shaped punching sheet I. Locking plates I with staggered positions are provided at the edges of the closed ventilation grooves of the first silicon steel sheet and the second silicon steel sheet; after several layers of closed ventilation grooves are interconnected, an axial ventilation hole I is jointly formed.

[0013] Further, in the above-mentioned offshore wind power rotor pole box, the third silicon steel sheet and the fourth silicon steel sheet each include an arc-shaped punching sheet II. An anti-disengagement protrusion II for facilitating connection with the yoke is provided at the inner arc edge of the arc-shaped punching sheet II. A clamping protrusion II is provided at one end of the arc-shaped punching sheet II, and a clamping groove II cooperating with the clamping protrusion II is formed at the other end of the arc-shaped punching sheet II. Permanent magnet mounting holes II are symmetrically formed at positions close to the outer arc edge of the arc-shaped punching sheet II, and open ventilation grooves are symmetrically formed at positions close to the inner arc edge of the arc-shaped punching sheet II. Locking plates II with staggered positions are provided at the edges of the open ventilation grooves of the third silicon steel sheet and the fourth silicon steel sheet; the open ventilation groove is composed of a first groove portion with a shape matching that of the closed ventilation groove and a second groove portion with an opening extending to the inner arc edge. After the first groove portions of several layers of open ventilation grooves are interconnected, an axial ventilation hole II is jointly formed, and after the second groove portions of several layers of open ventilation grooves are interconnected, a radial ventilation hole is jointly formed.

[0014] Further, in the above-mentioned offshore wind power rotor pole box, the anti-disengagement protrusion I and the anti-disengagement protrusion II are in an outer-wide and inner-narrow T-shaped structure.

[0015] Further, in the above-mentioned offshore wind power rotor pole box, the clamping protrusion I and the clamping protrusion II are in an outer-wide and inner-narrow T-shaped-like structure.

[0016] Further, in the above-mentioned offshore wind power rotor pole box, the locking plate I or the locking plate II can be formed into an L-shaped buckle plate structure that locks the silicon steel sheet where it is located and the adjacent silicon steel sheet together through stamping and bending.

[0017] The present invention also provides a stacking and forming system for an offshore wind power rotor pole box. The stacking and forming system includes a stacking positioning cover and a stacking and forming assembly disposed above it; the stacking and forming assembly includes a base, a linear guide pair is installed on the base, a carrier frame is installed outside the slider of the linear guide pair, a first stacking push rod is installed at the bottom of the carrier frame, a stacking block is installed at the movable end of the first stacking push rod, an adjustable distance push rod is fixed in the carrier frame, a second stacking push rod supported by the carrier frame for horizontal sliding is installed at the movable end of the adjustable distance push rod, and a bending punch is installed at the movable end of the second stacking push rod.

[0018] Further, in the above stacking and forming system, a stacking cavity for facilitating the stacking of various silicon steel sheets is provided in the stacking positioning cover; the shape of the stacking block matches the main shape of the first silicon steel sheet, and no locking plate I is provided at the position of the closed ventilation groove of the stacking block.

[0019] Further, in the above stacking and forming system, the shape of the bending punch matches the shape of the closed ventilation groove, and when the bending punch moves down, it can punch and bend the lower locking plate I and locking plate II to form an L-shaped buckle structure.

[0020] The present invention also provides a stacking and forming method for an offshore wind power rotor pole box, which is realized based on the above stacking and forming system, and includes the following steps:

[0021] S1. Stack the corresponding first silicon steel sheet, second silicon steel sheet, third silicon steel sheet and fourth silicon steel sheet in the stacking positioning cover in the form of staggered distribution of pole box section I and pole box section II;

[0022] S2. Start the first stacking push rod of the stacking and forming assembly, and use the stacking block to uniformly press the silicon steel sheet; start the second stacking push rod of the stacking and forming assembly, and use the bending punch to punch and bend the lower locking plate I / locking plate II to form an L-shaped buckle structure that locks the silicon steel sheet where the locking plate I / locking plate II is located and the adjacent silicon steel sheet into one body.

[0023] The beneficial effects of the present invention are:

[0024] 1. In the present invention, the structure of the magnetic pole box is reasonably designed. It is composed of several alternately distributed magnetic pole box segments I and magnetic pole box segments II. An axial ventilation hole I is added in the magnetic pole box segment I, and an axial ventilation hole II and a radial ventilation hole communicating therewith are added in the magnetic pole box segment II. The position of the axial ventilation hole II corresponds to and communicates with that of the axial ventilation hole I. In this way, the heat inside the magnetic pole box is quickly transferred through the heat dissipation channel composed of the axial ventilation hole I, the axial ventilation hole II, and the radial ventilation hole, thereby achieving rapid heat dissipation. On the other hand, lock plates I / lock plates II with staggered positions are arranged at the edges of the axial ventilation hole I / axial ventilation hole II. By stamping and bending the lock plates I / lock plates II, an L-shaped buckle plate structure can be formed to lock the silicon steel sheet where the lock plates I / lock plates II are located and the adjacent silicon steel sheets into one body. In this way, the adhesive bonding and fixing are replaced, and the magnetic lamination coefficient of the magnetic pole box is greatly improved.

[0025] 2. In the present invention, the lamination forming system is reasonably designed. It meets the lamination forming requirements of the above-mentioned magnetic pole box, can achieve uniform application, and reduce the gap of the silicon steel sheet bracket; at the same time, it can stamp and bend the lock plates I / lock plates II to meet the self-locking requirements of the magnetic pole box.

[0026] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of the whole magnetic pole box of the present invention;

[0029] Figure 2 It is a schematic structural diagram of the magnetic pole box segment I of the present invention;

[0030] Figure 3 It is a schematic structural diagram of the first silicon steel sheet of the present invention;

[0031] Figure 4 It is a schematic structural diagram of the second silicon steel sheet of the present invention;

[0032] Figure 5 It is a schematic structural diagram of the magnetic pole box segment II of the present invention;

[0033] Figure 6 It is a schematic structural diagram of the third silicon steel sheet of the present invention;

[0034] Figure 7It is a schematic structural diagram of the fourth silicon steel sheet in the present invention;

[0035] Figure 8 It is a schematic diagram of the composition of the lamination forming system in the present invention;

[0036] Figure 9 It is a schematic structural diagram of the lamination positioning cover in the present invention;

[0037] Figure 10 It is a schematic structural diagram of the lamination forming assembly in the present invention;

[0038] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0039] 1 - Pole box, 11 - Pole box segment I, 11a - First silicon steel sheet, 11b - Second silicon steel sheet, 111 - Arc-shaped punching sheet I, 112 - Anti-detachment protrusion I, 113 - Clamping protrusion I, 114 - Clamping groove I, 115 - Permanent magnet mounting hole I, 116 - Closed ventilation groove, 117 - Locking plate I;

[0040] 12 - Pole box segment II, 12a - Third silicon steel sheet, 12b - Fourth silicon steel sheet, 121 - Arc-shaped punching sheet II, 122 - Anti-detachment protrusion II, 123 - Clamping protrusion II, 124 - Clamping groove II, 125 - Permanent magnet mounting hole II, 126 - Open ventilation groove, 127 - Locking plate II;

[0041] 2 - Lamination positioning cover;

[0042] 3 - Lamination forming assembly, 301 - Base, 302 - Linear guide pair, 303 - Carrier frame, 304 - First lamination push rod, 305 - Lamination block, 306 - Spacing adjustment push rod, 307 - Second lamination push rod, 308 - Bending punch. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] Such as Figures 1 - 7As shown in the figure, this embodiment provides an offshore wind power rotor pole box. The pole box 1 is composed of a number of staggeredly distributed pole box segments I11 and pole box segments II12. The pole box segment I11 is formed by laminating a number of staggeredly distributed first silicon steel sheets 11a and second silicon steel sheets 11b. The pole box segment II12 is formed by laminating a number of staggeredly distributed third silicon steel sheets 12a and fourth silicon steel sheets 12b. An axial ventilation hole I is provided in the pole box segment I11, and an axial ventilation hole II and a radial ventilation hole communicating with it are provided in the pole box segment II12. The position of the axial ventilation hole II corresponds to and communicates with that of the axial ventilation hole I. The heat inside the pole box 1 is quickly dissipated through the heat dissipation channel formed by the axial ventilation hole I, the axial ventilation hole II, and the radial ventilation hole.

[0045] In this embodiment, the first silicon steel sheet 11a and the second silicon steel sheet 11b each include an arc-shaped punching sheet I111. An anti-disengagement protrusion I112 for facilitating connection with the yoke is provided at the inner arc edge of the arc-shaped punching sheet I111. A clamping protrusion I113 is provided at one side end of the arc-shaped punching sheet I111, and a clamping groove I114 cooperating with the clamping protrusion I113 is provided at the other side end of the arc-shaped punching sheet I111. Permanent magnet mounting holes I115 are symmetrically provided near the outer arc edge of the arc-shaped punching sheet I111. Closed ventilation grooves 116 are symmetrically provided near the inner arc edge of the arc-shaped punching sheet I111. Locking plates I117 with staggered positions are provided at the edges of the first silicon steel sheet 11a and the second silicon steel sheet 11b at the closed ventilation grooves 116. After several layers of closed ventilation grooves 116 are interconnected, they together form the axial ventilation hole I.

[0046] In this embodiment, the third silicon steel sheet 12a and the fourth silicon steel sheet 12b each include an arc-shaped punching sheet II121. An anti-disengagement protrusion II122 for facilitating connection with the yoke is provided at the inner arc edge of the arc-shaped punching sheet II121. A clamping protrusion II123 is provided at one side end of the arc-shaped punching sheet II121, and a clamping groove II124 cooperating with the clamping protrusion II123 is provided at the other side end of the arc-shaped punching sheet II121. Permanent magnet mounting holes II125 are symmetrically provided near the outer arc edge of the arc-shaped punching sheet II121. Open ventilation grooves 126 are symmetrically provided near the inner arc edge of the arc-shaped punching sheet II121. Locking plates II127 with staggered positions are provided at the edges of the third silicon steel sheet 12a and the fourth silicon steel sheet 12b at the open ventilation grooves 126. The open ventilation groove 126 is composed of a first groove portion matching the shape of the closed ventilation groove 116 and a second groove portion with an opening extending to the inner arc edge. After the first groove portions of several layers of open ventilation grooves 126 are interconnected, they together form the axial ventilation hole II. After the second groove portions of several layers of open ventilation grooves 126 are interconnected, they together form the radial ventilation hole.

[0047] In this embodiment, the anti-disengagement protrusion I112 and the anti-disengagement protrusion II122 are of an outer-wide and inner-narrow T-shaped structure.

[0048] In this embodiment, the clamping protrusion I113 and the clamping protrusion II123 are in a T-shaped structure with a wider outer width and a narrower inner width.

[0049] In this embodiment, the locking plate I117 or the locking plate II127 can be formed into an L-shaped clamping plate structure that locks the silicon steel sheet where it is located and the adjacent silicon steel sheets together through stamping and bending.

[0050] The specific application of this embodiment is as follows: The magnetic pole box structure is reasonably designed and is composed of a number of alternately distributed magnetic pole box segments I and magnetic pole box segments II. An axial ventilation hole I is added in the magnetic pole box segment I, and an axial ventilation hole II and a radial ventilation hole communicated with it are added in the magnetic pole box segment II. The position of the axial ventilation hole II corresponds to and communicates with that of the axial ventilation hole I. In this way, the heat inside the magnetic pole box is quickly transferred through the heat dissipation channels composed of the axial ventilation hole I, the axial ventilation hole II, and the radial ventilation hole, thereby achieving rapid heat dissipation. On the other hand, locking plates I / locking plates II with staggered positions are arranged at the edges of the axial ventilation hole I / axial ventilation hole II. By stamping and bending the locking plates I / locking plates II, an L-shaped clamping plate structure that locks the silicon steel sheet where the locking plates I / locking plates II are located and the adjacent silicon steel sheets together can be formed. In this way, adhesive bonding and fixing are replaced, and the magnetic lamination coefficient of the magnetic pole box is greatly improved.

[0051] Embodiment Two

[0052] As Figures 8 - 10 shown, this embodiment provides a lamination forming system for an offshore wind power rotor magnetic pole box. The lamination forming system includes a lamination positioning cover 2 and a lamination forming assembly 3 arranged above it. The lamination forming assembly 3 includes a base 301. A linear guide pair 302 is installed on the base 301, and a carrier frame 303 is installed outside the slider of the linear guide pair 302. A first lamination push rod 304 is installed at the bottom of the carrier frame 303, and a lamination block 305 is installed at the movable end of the first lamination push rod 304. A distance adjusting push rod 306 is fixed in the carrier frame 303. A second lamination push rod 307 supported by the carrier frame 303 for horizontal sliding is installed at the movable end of the distance adjusting push rod 306, and a bending punch 308 is installed at the movable end of the second lamination push rod 307.

[0053] In this embodiment, a stacking cavity for facilitating the stacking of various silicon steel sheets is provided in the lamination positioning cover 2; the shape of the lamination block 305 matches the main shape of the first silicon steel sheet 11a, and no locking plate I is provided at the position of the closed ventilation groove 116 of the lamination block 305.

[0054] In this embodiment, the shape of the bending punch 308 matches the shape of the closed ventilation groove 116. When the bending punch 308 moves downward, it can stamp and bend the lower locking plate I117 and locking plate II127 to form an L-shaped clamping plate structure.

[0055] This embodiment also provides a lamination forming method for an offshore wind turbine rotor pole box, comprising the following steps:

[0056] S1, according to the staggered distribution of the magnetic pole box segment I117 and the magnetic pole box segment II127, the corresponding first silicon steel sheet 11a, the second silicon steel sheet 11b, the third silicon steel sheet 12a and the fourth silicon steel sheet 12b are stacked in the stacking positioning cover 2;

[0057] S2. Start the first stacking push rod 304 of the stacking forming component 3, and use the stacking block 305 to evenly apply pressure to the silicon steel sheet; start the second stacking push rod 307 of the stacking forming component 3, and use the bending punch 308 to punch and bend the locking plate I / locking plate II below, so that the silicon steel sheet where the locking plate I / locking plate II is located is locked with the adjacent silicon steel sheet into an L-shaped buckle plate structure.

[0058] The specific application of this embodiment is: the lamination forming system is reasonably designed, which meets the lamination forming requirements of the above-mentioned pole box, can achieve uniform application, and reduce the gap of the silicon steel sheet bracket; at the same time, the lock plate I / lock plate II can be stamped and bent to meet the self-locking requirements of the pole box.

[0059] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Offshore wind power rotor pole box, characterized in that, The magnetic pole box is composed of a number of alternately distributed magnetic pole box segments I and magnetic pole box segments II combined together; The magnetic pole box segment I is formed by laminating a number of alternately distributed first silicon steel sheets and second silicon steel sheets; The magnetic pole box segment II is formed by laminating a number of alternately distributed third silicon steel sheets and fourth silicon steel sheets; An axial ventilation hole I is provided in the magnetic pole box segment I, an axial ventilation hole II and a radial ventilation hole communicating with it are provided in the magnetic pole box segment II, and the position of the axial ventilation hole II corresponds to and communicates with the axial ventilation hole I; The heat inside the magnetic pole box is quickly dissipated through the heat dissipation channel composed of the axial ventilation hole I, the axial ventilation hole II and the radial ventilation hole.

2. The offshore wind power rotor pole box according to claim 1, characterized in that, Each of the first silicon steel sheet and the second silicon steel sheet includes an arc-shaped punching sheet I. An anti-detachment protrusion I for facilitating connection with the yoke is provided at the inner arc edge of the arc-shaped punching sheet I. A clamping protrusion I is provided at one side end of the arc-shaped punching sheet I. A clamping groove I matching with the clamping protrusion I is provided at the other side end of the arc-shaped punching sheet I. Permanent magnet mounting holes I are symmetrically provided near the outer arc edge of the arc-shaped punching sheet I. Closed ventilation grooves are symmetrically provided near the inner arc edge of the arc-shaped punching sheet I. Locking plates I with staggered positions are provided at the edge of the closed ventilation grooves of the first silicon steel sheet and the second silicon steel sheet; after a number of layers of closed ventilation grooves are interconnected, they together form the axial ventilation hole I.

3. The offshore wind power rotor pole box according to claim 2, wherein, Each of the third silicon steel sheet and the fourth silicon steel sheet includes an arc-shaped punching sheet II. An anti-detachment protrusion II for facilitating connection with the yoke is provided at the inner arc edge of the arc-shaped punching sheet II. A clamping protrusion II is provided at one side end of the arc-shaped punching sheet II. A clamping groove II matching with the clamping protrusion II is provided at the other side end of the arc-shaped punching sheet II. Permanent magnet mounting holes II are symmetrically provided near the outer arc edge of the arc-shaped punching sheet II. Open ventilation grooves are symmetrically provided near the inner arc edge of the arc-shaped punching sheet II. Locking plates II with staggered positions are provided at the edge of the open ventilation grooves of the third silicon steel sheet and the fourth silicon steel sheet; the open ventilation groove is composed of a first groove portion matching the shape of the closed ventilation groove and a second groove portion with an opening extending to the inner arc edge. After the first groove portions of a number of layers of open ventilation grooves are interconnected, they together form the axial ventilation hole II. After the second groove portions of a number of layers of open ventilation grooves are interconnected, they together form the radial ventilation hole.

4. The offshore wind power rotor pole box according to claim 3, characterized in that The anti-detachment protrusion I and the anti-detachment protrusion II are in a T-shaped structure with a wide outer part and a narrow inner part.

5. The offshore wind power rotor pole box according to claim 4, characterized in that, The clamping protrusion I and the clamping protrusion II are in a T-shaped-like structure with a wide outer part and a narrow inner part.

6. The offshore wind power rotor pole box according to claim 5, characterized in that, The locking plate I or the locking plate II can be formed into an L-shaped clamping plate structure that locks the silicon steel sheet where it is located and the adjacent silicon steel sheet through stamping and bending.

7. The lamination forming system of the offshore wind power rotor pole box according to claim 6, characterized in that, This lamination forming system includes a lamination positioning cover and a lamination forming assembly arranged above it; the lamination forming assembly includes a base. A linear guide pair is installed on the base. A carrier frame is installed on the outside of the slider of the linear guide pair. A first lamination push rod is installed at the bottom of the carrier frame. A lamination block is installed at the movable end of the first lamination push rod. An adjustable-distance push rod is fixed in the carrier frame. A second lamination push rod horizontally slidably supported by the carrier frame is installed at the movable end of the adjustable-distance push rod. A bending punch is installed at the movable end of the second lamination push rod.

8. The stacked molding system according to claim 7, wherein, The stacking and positioning cover is provided with a stacking cavity for facilitating the stacking of various silicon steel sheets; the shape of the stacking block is matched with the main body shape of the first silicon steel sheet, and the locking plate I is not provided at the position of the stacking block where the closed ventilation groove is located.

9. The stacked molding system according to claim 8, wherein The shape of the bending punch is matched with the shape of the closed ventilation groove. When the bending punch moves downward, it can punch and bend the lower locking plate I and locking plate II to form an L-shaped buckle plate structure.

10. The stacking and forming method of the offshore wind power rotor pole box is realized based on the offshore wind power rotor pole box stacking and forming system described in claim 9, and is characterized in that, It includes the following steps: S1. Stack the corresponding first silicon steel sheet, second silicon steel sheet, third silicon steel sheet and fourth silicon steel sheet in the stacking and positioning cover in the form of staggered distribution of the magnetic pole box segment I and the magnetic pole box segment II. S2. Start the first stacking push rod of the stacking and forming assembly, and use the stacking block to uniformly press the silicon steel sheets; start the second stacking push rod of the stacking and forming assembly, and use the bending punch to punch and bend the lower locking plate I / locking plate II to form an L-shaped buckle plate structure that locks the silicon steel sheet where the locking plate I / locking plate II is located and the adjacent silicon steel sheet together.

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