Double-section motor magnetic circuit stator assembly mounting device and method

Abstract

The invention discloses a double-section motor magnetic circuit stator assembly installation device and method, and relates to the technical field of motor tools.The double-section motor magnetic circuit stator assembly installation device comprises a base, an inner positioning ring, an outer positioning ring, a gland, a magnetic isolation block and a movable supporting block, the base is coaxially connected with the inner positioning ring, the inner positioning ring is coaxially and movably connected with the gland, the gland is coaxially sleeved with the outer positioning ring, and the magnetic isolation block is arranged on the outer positioning ring; an annular cavity for containing the magnetic steel blocks is formed between the inner positioning ring and the outer positioning ring, the magnetic steel blocks and the magnetic isolation blocks are the same in shape and size, a plurality of inserting grooves and cushion blocks are arranged on the base at intervals, the movable supporting blocks are movably arranged in the inserting grooves, and the magnetic isolation blocks are arranged above the movable supporting blocks and can be inserted into the inserting grooves in a falling mode. The distance between the gland and the cushion block is equal to the thickness of at least one magnetic steel block, the outer diameter of the cushion block and the outer diameter of the gland are both larger than the outer diameter of the inner positioning ring, a discharging groove is formed in the gland, and one magnetic steel block can pass through the discharging groove. Interference of mutual repulsive force of the magnetic steel pieces on assembly is avoided, and efficiency and safety in the assembly process are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of motor tooling, and in particular to a device and method for installing a stator assembly of a double-section motor magnetic circuit. Background Art

[0002] The magnetic circuit stator assembly in the motor's external magnetic circuit is mainly composed of 2 groups of main magnetic steel assemblies (each group is composed of multiple magnetic steel tiles) and 3 auxiliary magnetic rings. The surface magnetic strength of the main magnetic steel and auxiliary magnetic ring parts is above 0.3T, and there is a great repulsion between them. The gap between the main magnetic steels is less than 0.02mm. At the same time, the permanent magnetic material of the magnetic tiles and magnetic ring parts is very brittle and easily damaged in a collision. The current installation method of installing magnetic tiles and magnetic rings into the outer magnetic poles piece by piece still has problems such as parts flying out and injuring operators and parts damage due to the repulsion between permanent magnetic parts. Therefore, a dual-stage motor magnetic circuit stator assembly installation device is urgently needed to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-stage motor magnetic circuit stator assembly installation device and method to solve the problems existing in the above-mentioned prior art, so that the permanent magnet parts of the magnetic circuit stator assembly can be assembled simply without damaging the parts during the process, and the parts will not fly out and injure the operator.

[0004] To achieve the above object, the present invention provides the following solutions: The present invention provides a dual-stage motor magnetic circuit stator assembly installation device, comprising a base, an inner positioning ring, an outer positioning ring, a pressure cover, a magnetic isolation block and a movable support block, wherein the inner positioning ring is coaxially connected to the base, the pressure cover is coaxially and movably connected to the inner positioning ring, the outer positioning ring is coaxially sleeved outside the pressure cover, an annular cavity is formed between the inner positioning ring and the outer positioning ring, the annular cavity is used to accommodate a magnetic steel block and the magnetic isolation block, the magnetic steel block and the magnetic isolation block have the same shape and size, a plurality of slots and pads are arranged at equal intervals on the base, the slots and the pads are arranged at intervals, the movable support block is movably arranged in the slots, the magnetic isolation block is arranged above the movable support block and can be dropped and inserted in the slots, the spacing between the pressure cover and the pad is the thickness of at least one magnetic steel block, the outer diameters of the pad and the pressure cover are both larger than the outer diameter of the inner positioning ring, and a material discharge groove is arranged on the pressure cover, the material discharge groove can accommodate one magnetic steel block and is connected to the annular cavity.

[0005] Preferably, the base includes a slot seat and a bottom plate, the bottom plate is connected to the slot seat by bolts, a plurality of U-shaped slots are evenly distributed circumferentially along the outer edge of the slot seat, the spacers between adjacent slots are the pads, the shape and size of the slots match the shape and size of the magnetic isolation block, so that the magnetic isolation block can fall into the slots.

[0006] Preferably, the size of the bottom plate is larger than that of the base, and the movable support block is slidably arranged on the bottom plate; the size of the pad on the base is larger than the inner diameter of the outer positioning ring.

[0007] Preferably, a limit pin is provided on the bottom plate, and the limit pin is located at the open end of the slot. A waist-shaped hole is provided in the middle of the movable support block, and the limit pin is slidably provided in the waist-shaped hole, so that the end of the movable support block can be inserted into and out of the slot.

[0008] Preferably, the thickness of the movable support block and the slot seat are the same as the thickness of the magnetic steel block; one magnetic isolation block is correspondingly arranged for one slot.

[0009] Preferably, the inner positioning ring is a cylinder, and both end surfaces of the cylinder are provided with plug-in grooves, and a threaded through hole is provided between the two plug-in grooves. The two plug-in grooves are respectively used to plug in the base and the pressure cover, and the pressure cover is also connected to the threaded through hole of the inner positioning ring by bolts.

[0010] Preferably, two plug-in holes are provided on the pressure cover, and the plug-in holes are used to plug in the operating handle; the pressure cover is evenly distributed along the circumference with a plurality of observation ports, and the observation ports are connected with the annular cavity and are arranged opposite to the connecting seams of the two magnetic steel blocks; the thickness of the pressure cover is at least the thickness of one magnetic steel block.

[0011] Preferably, the outer edge of the pressure cover is provided with the discharge trough and the stopper, the shape and size of the discharge trough match the shape and size of the magnetic steel block, the edge of the discharge trough is connected to the stopper by bolts or torsion springs, and the stopper can rotate and block the top of the discharge trough.

[0012] Preferably, the base, the inner positioning ring, the outer positioning ring, the pressure cover, the magnetic isolation block and the movable support block are all made of non-magnetic conductive materials.

[0013] Preferably, the inner hole of the outer positioning ring includes a cylindrical surface segment and a conical surface segment connected in sequence from bottom to top, the length of the cylindrical surface segment is not less than the length of the magnetic steel, the length of the conical surface segment is 1.2 times to 1.5 times the length of the magnetic steel, and the conical surface segment is inclined outward by 2° to 5°.

[0014] The present invention also relates to a method for installing a dual-section motor magnetic circuit stator assembly, based on the above-mentioned dual-section motor magnetic circuit stator assembly installation device, specifically comprising the following steps: S1, when assembling the dual-stage motor magnetic circuit stator assembly installation device, first place a plurality of magnetic isolation blocks in the annular cavity, and make each magnetic isolation block be located above the movable support block, then rotate the gland, and sequentially place one magnetic steel block on each of the pads from the discharge trough, so that the magnetic steel blocks and the magnetic isolation blocks form a closed loop; S2, rotating the gland so that the discharge slot corresponds to any one of the magnetic isolation blocks, placing one of the magnetic steel blocks, pulling out the movable support block, causing the magnetic isolation block to fall into the slot, and inserting the newly placed magnetic steel block between two adjacent magnetic steel blocks; S3, repeat S2 until all the magnetic isolation blocks fall into the slots and each magnetic steel block forms a magnetic steel ring; S4, remove the pressure cover, lift out the outer positioning ring and the magnetic steel ring together and coaxially insert them into a mounting base, apply adhesive on the inner wall surface of the outer magnetic pole, align the mounting tube with the outer magnetic pole, insert it into the outer positioning ring from top to bottom and press down the magnetic steel ring, so that the magnetic steel ring moves out of the outer positioning ring and is pressed into the outer magnetic pole, insert the outer magnetic pole along the mounting tube into the outside of the magnetic steel ring, take out the outer magnetic pole after assembly, and place the assembled magnetic steel ring in a safe place for standby use.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: The present invention solves the interference of the mutual repulsion of magnetic steel parts on assembly, ensures the efficiency and safety of the assembly process, and provides a reliable installation method according to the stator assembly method, so that the assembly operation of the permanent magnet parts of the magnetic circuit stator assembly is simple and the parts will not be damaged during the process, and the parts will not fly out and injure the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a stator assembly installation device for a double-stage motor magnetic circuit according to an embodiment of the present invention; Figure 2 For the embodiment of the present invention Figure 1 Schematic diagram of the cross-sectional structure of AA; Figure 3 The internal schematic diagram of the stator assembly of the double-stage motor magnetic circuit in the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 4The internal schematic diagram of the stator assembly of the double-stage motor magnetic circuit in the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 5 It is a structural schematic diagram of a base in an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a movable support block in an embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of the gland in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the outer positioning ring in an embodiment of the present invention; Fig. 9 A schematic diagram of the installation process of the stator assembly of the double-stage motor magnetic circuit in an embodiment of the present invention; In the figure: 1-bottom plate, 2-card slot seat, 3-movable support block, 4-inner positioning ring, 5-pressure cover, 6-magnetic isolation block, 7-magnetic steel block, 8-outer positioning ring, 9-slot, 10-pad, 11-limit pin, 12-waist hole, 13-discharge trough, 14-stopper, 15-bolt, 16-plug hole, 17-observation port, 18-mounting base, 19-mounting cylinder, 20-outer magnetic pole. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0019] The purpose of the present invention is to provide a dual-stage motor magnetic circuit stator assembly installation device and method to solve the problems existing in the prior art, so that the permanent magnet parts of the magnetic circuit stator assembly can be assembled simply without damaging the parts during the process, and the parts will not fly out and injure the operator.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Embodiment 1 like Figures 1 to 8As shown, in this embodiment, a dual-stage motor magnetic circuit stator assembly installation device is provided, including a base, an inner positioning ring 4, an outer positioning ring 8, a gland 5, a magnetic isolation block 6 and a movable support block 3. The base is coaxially connected with the inner positioning ring 4, the inner positioning ring 4 is coaxially and movably connected with the gland 5, the outer positioning ring 8 is coaxially sleeved outside the gland 5, and an annular cavity is formed between the inner positioning ring 4 and the outer positioning ring 8, and the annular cavity is used to accommodate the magnetic steel block 7 and the magnetic isolation block 6. The shape and size of the magnetic steel block 7 and the magnetic isolation block 6 are exactly the same. A plurality of slots 9 and pads 10 are arranged at equal intervals on the base, and the slots 9 and pads 10 are arranged at intervals. The movable support block 3 is movably arranged in the slot 9, and the magnetic isolation block 6 is arranged above the movable support block 3 and can be dropped and inserted into the slot 9. The distance between the gland 5 and the pad 10 is the thickness of at least one magnetic steel block 7. The outer diameters of the pad 10 and the gland 5 are both larger than the outer diameter of the inner positioning ring 4. A discharge groove 13 is arranged on the gland 5, and the discharge groove 13 can accommodate a magnetic steel block 7 and is connected to the ring cavity.

[0022] As an optional solution, the base in this embodiment includes a slot seat 2 and a bottom plate 1, and the bottom plate 1 is connected to the slot seat 2 by bolts 15. The outer edge of the slot seat 2 is circumferentially evenly distributed with a plurality of slots 9. In this embodiment, a U-shaped slot is preferred, and the spacing platform between adjacent slots 9 is a cushion block 10. The shape and size of the slot 9 match the shape and size of the magnetic isolation block 6, so that the magnetic isolation block 6 can fall into the slot 9. The thickness of the magnetic isolation block 6 is the same as the thickness of the slot seat 2, which is convenient for maintaining the flatness of the upper surface, so that the magnetic isolation block 6 can support the magnetic steel block 7 after falling, so that the bottom surface of the magnetic steel ring is flat, and the assembly accuracy is guaranteed.

[0023] As an optional solution, in this embodiment, the size of the bottom plate 1 is larger than that of the base, and a movable support block 3 is slidably provided on the bottom plate 1; the size of the cushion block 10 on the base is larger than the inner diameter of the outer positioning ring 8.

[0024] As an optional solution, in this embodiment, a limit pin 11 is provided on the base plate 1, and the limit pin 11 is located at the open end of the slot 9. A waist-shaped hole 12 is provided in the middle of the movable support block 3. The limit pin 11 is slidably set in the waist-shaped hole 12, so that the end of the movable support block 3 can be inserted into and out of the slot 9, thereby realizing the telescopic sliding of the movable support block 3. When the movable support block 3 is extended, the magnetic isolation block 6 is supported. When the movable support block 3 is pulled back, the magnetic isolation block 6 falls down and supports the magnetic steel block 7.

[0025] As an optional solution, in this embodiment, the thickness of the movable support block 3 and the slot seat 2 are the same as the thickness of the magnetic steel block 7; a slot 9 is correspondingly provided with a magnetic isolation block 6. When the magnetic steel block 7 and the simulation block are replaced, the magnetic isolation block 6 is dropped to make room for installing the magnetic steel block 7.

[0026] As an optional solution, the inner positioning ring 4 in the present embodiment is a cylinder, and plug-in grooves are provided on both end surfaces of the cylinder, and a threaded through hole is provided between the two plug-in grooves. The two plug-in grooves are used to plug in the base and the pressure cover 5 respectively. The positioning is reliable and the assembly operation is simple. The pressure cover 5 is also connected to the threaded through hole of the inner positioning ring 4 by bolts 15 to ensure the stability of the structure.

[0027] As an optional solution, in this embodiment, two plug-in holes 16 are provided on the pressure cover 5, and the plug-in holes 16 are used to plug in the operating handle to facilitate the rotation and removal of the pressure cover 5; the pressure cover 5 is evenly distributed along the circumference with a plurality of observation ports 17, and the observation ports 17 are connected to the annular cavity and are arranged opposite to the connecting seams of the two magnetic steel blocks 7; the thickness of the pressure cover 5 is at least the thickness of one magnetic steel block 7, which serves as a guide channel to ensure assembly accuracy.

[0028] As an optional solution, in this embodiment, the outer edge of the pressure cover 5 is provided with a discharge groove 13 and a stopper 14. The shape and size of the discharge groove 13 match the shape and size of the magnetic steel block 7. The edge of the discharge groove 13 is connected with the stopper 14 through a bolt 15 or a torsion spring. The stopper 14 can rotate and block the top of the discharge groove 13. After the magnetic steel block 7 is installed, the stopper 14 is used to cover the discharge groove 13 to prevent the magnetic steel block 7 from flying out and injuring people due to magnetic force.

[0029] As an optional solution, in this embodiment, the base, the inner positioning ring 4, the outer positioning ring 8, the gland 5, the magnetic isolation block 6 and the movable support block 3 are all made of non-magnetic materials to avoid the magnetic force generated by the magnetic steel block 7 and affecting the assembly process. Because the magnetic isolation block 6 is non-magnetic, half of the magnetic steel block 7 can be symmetrically separated during the installation process to avoid magnetic repulsion. When the remaining half of the magnetic steel block 7 is installed, the magnetic isolation block 6 is moved out of the space through the movable support block 3 and replaced one by one.

[0030] As an optional solution, the inner hole of the outer positioning ring 8 in this embodiment includes a cylindrical surface segment and a conical surface segment connected in sequence from bottom to top. The length of the cylindrical surface segment is not less than the length of the magnet, the length of the conical surface segment is 1.2 times to 1.5 times the length of the magnet, and the conical surface segment is inclined outward by 2° to 5°. By adopting a variable diameter design to gradually tighten the gap with the magnet, it is avoided that the parts are damaged during the assembly process of the magnet and the magnet is prevented from flying out and injuring the operator.

[0031] Embodiment 2 like Figure 3 , Figure 4 , Fig. 9 As shown, in this embodiment, a method for installing a dual-stage motor magnetic circuit stator assembly is provided. Based on the above-mentioned dual-stage motor magnetic circuit stator assembly installation device, the method specifically includes the following steps: S1, when assembling the installation device of the stator assembly of the double-stage motor magnetic circuit, first place a number of magnetic isolation blocks 6 in the annular cavity, and make each magnetic isolation block 6 located above the movable support block 3 (initially the magnetic isolation blocks 6 are distributed at intervals), then rotate the pressure cover 5, and put a magnetic steel block 7 from the discharge trough 13 on each cushion block 10 (between two adjacent magnetic isolation blocks 6) in turn, so that the magnetic steel block 7 and the magnetic isolation block 6 form a closed loop; the magnetic steel block 7 is assembled between the two magnetic isolation blocks 6, which reduces the difficulty of early assembly and reduces the influence of magnetic steel mutual repulsion on assembly.

[0032] S2, rotating the pressure cover 5 so that the discharge slot 13 corresponds to any magnetic isolation block 6, putting a magnetic steel block 7 in, pulling out the movable support block 3, making the magnetic isolation block 6 fall into the slot 9, and at the same time making the newly put magnetic steel block 7 inserted between two adjacent magnetic steel blocks 7; S3, repeat S2 until all the magnetic isolation blocks 6 fall into the slots 9, and each magnetic steel block 7 forms a magnetic steel ring; S4, remove the pressure cover 5, lift out the magnetic steel ring and the outer positioning ring 8 together, and coaxially insert the outer positioning ring 8 and the magnetic steel ring into a mounting base 18. Before the installation, the operator applies adhesive on the inner wall surface of the outer magnetic pole, and then aligns the mounting tube 19 with the outer magnetic pole 20, inserts it into the outer positioning ring 8 from top to bottom and presses the magnetic steel ring downward, so that the magnetic steel ring moves out of the outer positioning ring 8 and is pressed into the outer magnetic pole 20, and the outer magnetic pole 20 is inserted into the outside of the magnetic steel ring along the mounting tube 19. After the assembly is completed, take out the outer magnetic pole 20, and place the assembled magnetic steel ring in a safe place for standby use.

[0033] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A dual-stage motor magnetic circuit stator assembly installation device, characterized in that: The invention comprises a base, an inner positioning ring, an outer positioning ring, a pressure cover, a magnetic isolation block and a movable support block, wherein the inner positioning ring is coaxially connected to the base, the pressure cover is coaxially and movably connected to the inner positioning ring, the outer positioning ring is coaxially sleeved outside the pressure cover, an annular cavity is formed between the inner positioning ring and the outer positioning ring, the annular cavity is used to accommodate the magnetic steel block and the magnetic isolation block, the shape and size of the magnetic steel block and the magnetic isolation block are exactly the same, a plurality of slots and pads are arranged at equal intervals on the base, the slots and the pads are arranged at intervals, the movable support block is movably arranged in the slots, the magnetic isolation block is arranged above the movable support block and can be dropped and inserted into the slots, the spacing between the pressure cover and the pad is the thickness of at least one magnetic steel block, the outer diameters of the pad and the pressure cover are both larger than the outer diameter of the inner positioning ring, a material discharge groove is arranged on the pressure cover, the material discharge groove can accommodate one magnetic steel block and is connected with the annular cavity.

2. The dual-stage motor magnetic circuit stator assembly installation device according to claim 1 is characterized in that: The base includes a slot seat and a bottom plate, the bottom plate is connected to the slot seat by bolts, a plurality of U-shaped slots are evenly distributed circumferentially along the outer edge of the slot seat, the spacers between adjacent slots are the pads, the shape and size of the slots match the shape and size of the magnetic isolation block, so that the magnetic isolation block can fall into the slots.

3. The dual-stage motor magnetic circuit stator assembly installation device according to claim 2 is characterized in that: The size of the bottom plate is larger than that of the base, and the movable support block is slidably arranged on the bottom plate; the size of the pad on the base is larger than the inner diameter of the outer positioning ring.

4. The dual-stage motor magnetic circuit stator assembly installation device according to claim 3 is characterized in that: A limit pin is arranged on the bottom plate, and the limit pin is located at the open end of the slot. A waist-shaped hole is arranged in the middle of the movable support block, and the limit pin is slidably arranged in the waist-shaped hole, so that the end of the movable support block can be inserted into and out of the slot.

5. The dual-stage motor magnetic circuit stator assembly installation device according to claim 2 is characterized in that: The thickness of the movable support block and the slot seat is the same as the thickness of the magnetic steel block; one magnetic isolation block is correspondingly arranged for one slot.

6. The dual-stage motor magnetic circuit stator assembly installation device according to claim 1 is characterized in that: The inner positioning ring is a cylinder, and both end surfaces of the cylinder are provided with plug-in grooves, a threaded through hole is provided between the two plug-in grooves, and the two plug-in grooves are used to plug the base and the pressure cover respectively. The pressure cover is also connected to the threaded through hole of the inner positioning ring by bolts.

7. The dual-stage motor magnetic circuit stator assembly installation device according to claim 1 is characterized in that: Two plug-in holes are arranged on the pressure cover, and the plug-in holes are used to plug in the operating handle; the pressure cover is evenly distributed with a plurality of observation ports along the circumference, and the observation ports are connected with the annular cavity and are arranged opposite to the connecting seams of the two magnetic steel blocks; the thickness of the pressure cover is at least the thickness of one magnetic steel block.

8. The dual-stage motor magnetic circuit stator assembly installation device according to claim 1 is characterized in that: The outer edge of the pressure cover is provided with the discharge trough and the stopper, the shape and size of the discharge trough match the shape and size of the magnetic steel block, the edge of the discharge trough is connected to the stopper by bolts or torsion springs, and the stopper can rotate and block the top of the discharge trough.

9. The dual-stage motor magnetic circuit stator assembly installation device according to claim 1 is characterized in that: The base, the inner positioning ring, the outer positioning ring, the pressure cover, the magnetic isolation block and the movable support block are all made of non-magnetic materials; the inner hole of the outer positioning ring includes a cylindrical surface segment and a conical surface segment connected in sequence from bottom to top, the length of the cylindrical surface segment is not less than the length of the magnetic steel, the length of the conical surface segment is 1.2 times to 1.5 times the length of the magnetic steel, and the conical surface segment is inclined outward by 2° to 5°.

10. A method for installing a stator assembly of a dual-section motor magnetic circuit, based on the dual-section motor magnetic circuit stator assembly installation device according to any one of claims 1 to 9, characterized in that: The specific steps include: S1, when assembling the dual-stage motor magnetic circuit stator assembly installation device, first place a plurality of magnetic isolation blocks in the annular cavity, and make each magnetic isolation block be located above the movable support block, then rotate the gland, and sequentially place one magnetic steel block on each of the pads from the discharge trough, so that the magnetic steel blocks and the magnetic isolation blocks form a closed loop; S2, rotating the gland so that the discharge slot corresponds to any one of the magnetic isolation blocks, placing one of the magnetic steel blocks, pulling out the movable support block, causing the magnetic isolation block to fall into the slot, and inserting the newly placed magnetic steel block between two adjacent magnetic steel blocks; S3, repeat S2 until all the magnetic isolation blocks fall into the slots and each magnetic steel block forms a magnetic steel ring; S4, remove the pressure cover, lift out the outer positioning ring and the magnetic steel ring together and coaxially insert them into a mounting base, apply adhesive on the inner wall surface of the outer magnetic pole, align the mounting tube with the outer magnetic pole, insert it into the outer positioning ring from top to bottom and press down the magnetic steel ring, so that the magnetic steel ring moves out of the outer positioning ring and is pressed into the outer magnetic pole, insert the outer magnetic pole along the mounting tube into the outside of the magnetic steel ring, take out the outer magnetic pole after assembly, and place the assembled magnetic steel ring in a safe place for standby use.

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