Hall thruster coil rack and winding method

Abstract

The invention relates to a Hall thruster coil rack and a winding method, and relates to the technical field of Hall electric propulsion. The coil rack of the Hall thruster comprises a cylindrical coil rack, a coil is wound on the coil rack in the circumferential direction; insulating paint is arranged between the coil and the coil rack; a winding inlet / outlet is formed in the lower part of the coil rack; a lead-in groove and a lead-out groove are respectively formed in the winding inlet and the winding outlet of the coil rack; the coil is tangent to the winding window after being wound by 90 degrees in the lead-in groove; the circle center of the lead-in groove is horizontally eccentric towards the winding outlet, and the value of the eccentric distance is determined within the outer diameter range of the winding inlet and the winding window through the inner diameter and the outer diameter of the lead-in groove; the leading-out groove and the coil rack share the same circle center, and the pitch diameter of the leading-out groove is consistent with the pitch diameter of the outermost layer coil. According to the Hall thruster coil rack, the problems that in an existing design scheme, a winding inlet and a winding outlet occupy space, and coil winding is not compact are solved, the coil winding compactness and the number of turns of the coil are increased, and the insulativity between the coil and the coil rack is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of Hall electric propulsion, and in particular to a Hall thruster coil frame and a winding method. Background Art

[0002] The Hall thruster magnetizes electrons through a magnetic field. When the electrons perform E×B drift motion in the discharge channel, they collide with neutral atoms to generate ions. The ions are accelerated by the electric field and ejected at high speed to form reverse thrust. The magnetic field of the Hall thruster is generally formed by an energized excitation coil through a specific magnetic circuit structure, and the excitation coil is fixed to the magnetic circuit structure through a coil frame.

[0003] Insulation between the coil and the coil frame is a necessary condition for generating a magnetic field. Under ignition conditions, the coil temperature of the Hall thruster usually reaches 300°C or even higher, part of which comes from the heat consumption of the coil itself. Under high temperature conditions, the metal of the nickel-plated copper wire evaporates slowly, causing coil embrittlement and insulation problems. Under the same magnetic circuit structure, in order to ensure the strength of the magnetic field, the ampere-turns of the coil should remain unchanged. Therefore, under the same coil volume capacity, the number of coil turns should be increased as much as possible, and the current should be reduced to reduce its own heat consumption. At the same time, when launching the active section, the loose winding between the coils and the coil frame and the friction between them will also cause the coil insulation to fail. Therefore, the coil frame design and winding method are an important part of the design and assembly of Hall thrusters.

[0004] Chinese patent document CN111768969B discloses a method for winding the excitation coil of a Hall thruster, which mainly involves spraying paint on the coil frame for insulation, increasing the return bend radius through a special wire outlet method, and obtaining double insulation by protecting the winding inlet and outlet. Chinese patent document CN111091967B discloses a method for curing the coil of a magnetic focusing Hall thruster, which mainly involves filling the space between the coils with thermally conductive insulating paint to reduce the coil temperature. However, none of the above technical solutions solves the problem of the space occupied by the coil at the inlet and outlet during the winding process, resulting in looseness in the height direction of the winding window and a reduction in the number of effective turns of the coil.

[0005] like Figure 8-11 As shown, in the prior art, the coil frame of the Hall thruster has a coil 3 with an outer diameter of φ, a coil frame 1 with a winding inner diameter of R1, a winding window height of H, a winding window width of L, a winding inlet and outlet width of q, and a winding inlet and outlet maximum height of p.

[0006] The winding window of coil frame 1 is sprayed with high-temperature insulating paint, and the thickness of the spray paint insulating layer is z.

[0007] The winding of coil 3 cannot exceed the outer envelope of the winding window body.

[0008] Coil 3 winding layers M is the integer rounded downward; the number of turns per layer N is rounded down to an integer.

[0009] If coil 3 uses 4-level single-core nickel-plated copper wire and vacuum fiber wire as insulation, the outer diameter of coil 3 is φ1mm. Coil frame 1 is made of titanium alloy material, the inner diameter of coil frame 1 winding is R133.5mm, the height of winding window is H18mm, the width of winding window is L6.5mm, the width of winding inlet and outlet is q7mm, and the maximum height of winding inlet and outlet is p3.5mm. High-temperature insulating paint is sprayed on the winding window of coil frame 1, and the thickness of the sprayed paint insulation layer is z, and the thickness of the sprayed paint here is 50μm.

[0010] When the winding method in the prior art is adopted, when M is an even number, the number of turns of coil 3 S=M×N-3; when M is an odd number, the number of turns of coil 3 S=(M-1)×N-3; among them, when winding the last layer of coil 3, when the distance from the winding inlet and outlet 4 is four turns, it is wound downward to the winding inlet and outlet 4 with a larger arc to increase the bending radius of coil 3.

[0011] Coil 3 winding layers M is the integer rounded down to 6; the number of turns per layer N is rounded down to 16.

[0012] When M is an even number, the number of turns of coil 3 is S=M×N-3=93 turns; when winding the last layer of coil 3, when there are four turns away from the winding inlet and outlet 4, it is wound downward to the winding inlet and outlet 4 with a larger arc to increase the bending radius of coil 3. Summary of the invention

[0013] The present invention aims to solve the technical problems in the prior art that the inlet and outlet of the Hall thruster coil winding occupies space and the coil is not tightly wound, and provides a Hall thruster coil frame and a winding method.

[0014] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0015] A Hall thruster coil frame, comprising: a cylindrical coil frame; a coil is wound on the coil frame in the circumferential direction; an insulating paint is provided between the coil and the coil frame; a winding inlet and outlet are provided at the lower part of the coil frame;

[0016] The coil frame is provided with an inlet groove and an outlet groove at the inlet and outlet positions of the winding wire respectively;

[0017] The coil is tangent to the winding window after being wound 90° in the introduction slot; the center of the introduction slot is horizontally eccentric toward the winding outlet, and the eccentricity is determined by the inner and outer diameters of the introduction slot within the range of the winding inlet and the outer diameter of the winding window;

[0018] The lead-out slot is co-centered with the coil frame, and the median diameter of the lead-out slot is consistent with the median diameter of the outermost coil.

[0019] In the above technical solution, an upper mica paper is provided between the upper end of the coil and the coil frame; and a lower mica paper is provided between the lower end of the coil and the coil frame.

[0020] In the above technical solution, the portion where the introduction groove is tangent to the coil frame is a slope.

[0021] In the above technical solution, the lead-out section of the lead-out groove is a slope.

[0022] In the above technical solution, the depth and width of the introduction groove are respectively between 1.5φ and 2φ, where φ is the outer diameter of the coil.

[0023] In the above technical solution, the depth and width of the lead-out groove are respectively between 1.5φ and 2φ, where φ is the outer diameter of the coil.

[0024] A winding method applicable to the above-mentioned Hall thruster coil frame comprises the following steps:

[0025] Step 1: sandblast the winding window of the coil frame to make the surface roughness of the substrate reach 3.2μm to 6.3μm;

[0026] Step 2: Spray water-based nano paint on the surface of the coil frame after sandblasting, stick the upper mica paper and the lower mica paper on the winding window respectively, and then put it into the oven, heat it to 90℃ and keep it for 8 minutes, then heat it to 280℃ and keep it for 1 hour, cool it in the oven and take it out;

[0027] Step 3: When winding the coil, put a quartz fiber tube on the entrance of the introduction slot. The protection range of the tube sleeve is 5 cm from the entrance section to the slope section of the introduction slot;

[0028] Step 4: When the angle with the winding inlet is 90°, the coil is tangent to the winding window in the introduction slot, and the coil is flush with the lower surface of the winding window. At this time, the coil is led out from the introduction slot to the innermost side of the winding window, and the winding of the coil begins;

[0029] Step 5: When the coil is fully wound, use a tool to fix the relative position of the coil and the coil frame, and spray water-based nano paint on the outer surface of the coil;

[0030] Step 6: When the coil is wound to the last turn, the coil is led out from the lead-out slot;

[0031] Step 7: Put a quartz fiber tube on the tail of the winding outlet, and the protection range of the tube sleeve is from the slope of the outlet groove to 5 cm of the outlet section;

[0032] Step 8: After the coil is wound, wrap 2 turns of quartz fiber cloth on the outermost layer of the coil. The quartz fiber cloth and the coil are fixed with water-based nano paint;

[0033] Step 9: Put the processed whole coil frame into the oven, heat it to 90℃ and keep it for 8 minutes, then heat it to 280℃ and keep it for 1 hour, cool it down in the oven and take it out to complete the coil winding and curing.

[0034] In the above technical solution, the synthetic materials of the water-based nano paint in steps 2, 5 and 8 include: component A: binder, component B: curing agent, component C: thermal conductive insulation;

[0035] The preparation process of the water-based nano paint is as follows:

[0036] After stirring component A and component B for 20 to 30 minutes respectively until they are uniform, weigh component A, weigh component B at a weight ratio of A:B=1.4:1, slowly add component B to component A, and stir at a speed of 300 r / min for 4 hours to obtain a mixed solution of components A and B;

[0037] After stirring component C for 20-30 minutes until it is uniform, weigh component C according to the total weight of components A and B: weight of component C = 3:1;

[0038] Add component C to the mixture of components A and B and stir for 20-30 minutes until uniform;

[0039] The above mixture was allowed to stand for 1 hour and then filtered through a 300-400 mesh filter to complete the preparation of the water-based nano paint.

[0040] The present invention has the following beneficial effects:

[0041] The Hall thruster coil frame of the present invention is designed with an introduction groove and an outlet groove in the direction of the winding inlet and outlet, and the coil is buried in the introduction groove and the outlet groove, thereby avoiding the problem of the winding inlet and outlet occupying space and the coil being loosely wound in the existing design.

[0042] The winding method of the present invention solves the problem of space occupation by the winding inlet and outlet coils, increases the winding compactness and the number of coil turns, and further improves the insulation between the coil and the coil frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Figure 1 It is a schematic diagram of the three-dimensional structure of the Hall thruster coil frame of the present invention.

[0045] Figure 2 for Figure 1 A top view of a partially cutaway view of a Hall thruster coil former is shown.

[0046] Figure 3 for Figure 1 The front view structural diagram of the Hall thruster coil frame is shown.

[0047] Figure 4 for Figure 3 Schematic diagram of the AA section in .

[0048] Figure 5 for Figure 3 Schematic diagram of the BB section.

[0049] Figure 6 The figure is a schematic diagram of the maximum eccentricity between the introduction slot and the coil frame of the Hall thruster coil frame of the present invention.

[0050] Figure 7 The figure is a schematic diagram of the value of the minimum eccentricity between the introduction slot and the coil frame of the Hall thruster coil frame of the present invention.

[0051] Figure 8 The figure is a schematic diagram of the structure of a coil frame according to a design scheme in the prior art.

[0052] Fig. 9 for Figure 8 Schematic diagram of the side structure of the coil frame shown.

[0053] Fig.10 for Fig. 9 Schematic diagram of the AA section in .

[0054] Fig.11 for Fig.10 An enlarged schematic diagram of the local position B in FIG.

[0055] Fig.12 It is a schematic structural diagram of the Hall thruster coil frame of the present invention.

[0056] Fig.13 for Fig.12 Schematic diagram of the side structure of the Hall thruster coil frame shown.

[0057] Fig.14 for Fig.13 Schematic diagram of the AA section in .

[0058] Fig.15 for Fig.14 An enlarged schematic diagram of the local position B in FIG.

[0059] Fig.16 for Fig.14 An enlarged schematic diagram of the local position C in FIG.

[0060] The reference numerals in the figures indicate:

[0061] 1-coil frame; 2-insulating paint; 3-coil; 4-winding inlet and outlet; 5-upper mica paper; 6-lower mica paper; 7-inlet slot; 8-exit slot. DETAILED DESCRIPTION

[0062] The inventive concept of the present invention is: the present invention proposes a Hall thruster coil frame and a winding method, which solves the problem of space occupied by winding inlet and outlet coils through integrated design of the inlet and outlet grooves and the winding method, increases the coil winding compactness and the number of coil turns, and improves the insulation between the coil and the coil frame.

[0063] The Hall thruster coil frame and winding method of the present invention include: lead-in slot design, lead-out slot design and winding method.

[0064] Lead-in slot design: Figure 1-7 As shown, the lead-in slot 7 is eccentrically designed with the coil frame 1 to ensure that the coil 3 is tangent to the winding window after winding 90° in the lead-in slot 7. The center of the lead-in slot 7 is horizontally eccentric toward the winding outlet, and the eccentricity t is determined by the inner and outer diameters of the lead-in slot 7 within the range of the winding inlet and the outer diameter of the winding window. At the same time, the slope design of the tangent part of the lead-in slot 7 and the coil frame 1 ensures that the coil 3 has support from the lead-in slot 7 to the winding window.

[0065] Export slot design: Figure 1-5 As shown, the lead-out slot 8 is cocentric with the coil frame 1, the middle diameter of the lead-out slot 8 is consistent with the middle diameter of the outermost coil 3, and the lead-out section of the lead-out slot 8 is designed with a slope to ensure that the coil 3 has support from the winding window to the lead-out slot 8.

[0066] Winding method: mica paper is pasted on the upper and lower parts of the winding window to ensure the winding compactness of the coil 3 in the height direction; quartz fiber tubes are put in the introduction slot 7 and the outlet slot 8 of the coil 3 to ensure the insulation of the introduction and outlet bending sections of the coil 3; after the coil 3 is wound, the coil 3 is wrapped with quartz fiber cloth as a whole to ensure the winding compactness of the coil 3 in the width direction. The problem of space occupied by the coil 3 in the winding inlet and outlet is solved, the winding compactness of the coil 3 and the number of turns of the coil 3 are increased, and the insulation between the coil 3 and the coil frame 1 is further improved.

[0067] The Hall thruster coil frame of the present invention selects a coil 3 with an outer diameter of φ, a coil frame 1 with a winding inner diameter of R1, a winding window height of H, a winding window width of L, a winding inlet and outlet width of q, and a winding inlet and outlet maximum height of p.

[0068] The winding window of coil frame 1 is sprayed with high-temperature insulating paint, and the thickness of the spray paint insulating layer is z.

[0069] The winding of coil 3 cannot exceed the outer envelope of the winding window body.

[0070] like Figure 12-16As shown, the coil frame of the Hall thruster of the present invention is designed with an introduction groove 7 and an outlet groove 8 in the winding inlet and outlet directions of the winding inlet and outlet 4. The depth d and width w of the introduction groove 7 and the outlet groove 8 should be between 1.5φ and 2φ. The introduction groove 7 and the outlet groove 8 are chamfered to protect the coil 3 from being scratched by the edges and corners.

[0071] Assuming that the coil 3 is wound counterclockwise, after the coil 3 is wound 90° from the inlet of the introduction slot 7, the inner diameter of the introduction slot 7 is tangent to the winding window, and the introduction slot 7 is horizontally eccentric t toward the winding outlet.

[0072] The inner diameter of the introduction groove 7 is R2 = R1 + t, and the outer diameter of the introduction groove 7 is R3 = R2 + w.

[0073] At the winding inlet and outlet 4, the outer diameter of the introduction groove 7 is tangent to the outer diameter of the winding window. At this time, when t takes the maximum value, t 2 +(R1+L) 2 ≥R3 2 , we can conclude

[0074] At the winding inlet and outlet 4, the inner diameter of the introduction slot 7 is at the bottom of the winding inlet slot. At this time, when t takes the minimum value, there is Conclusion

[0075] The lead-out slot 8 leads out the outermost coil 3, so the lead-out slot 8 should be cocentric with the coil frame 1, and the middle diameter of the lead-out slot 8 should be consistent with the middle diameter of the outermost coil 3. In order to ensure the guidance of the coil 3, the lead-out slot 8 should have a 90° range.

[0076] Inner diameter of lead-out groove 8 The outer diameter of the lead-out groove 8 is R5=R4+w.

[0077] In order to ensure that the bottom of the coil 3 is supported when the coil 3 is led from the lead-in slot 7 to the coil frame 1, a slope is set in the lead-out section of the lead-in slot 7, the slope angle is 180°-a, and the depth in the slot at the tangent position of the coil 3 is h=φ+z.

[0078] Similarly, to ensure that the last turn of the coil 3 is led out from the winding window, the bottom of the coil 3 is supported, and the lead-out slot 8 is provided with a slope in the lead-out section, the slope angle is 180°-a, and the depth in the slot at the tangent position of the coil 3 is h=φ+z.

[0079] Using the winding scheme of the present invention, the number of winding layers of coil 3 is M is the integer rounded downward; the number of turns per layer N is an integer rounded down. When M is an even number, the number of turns of coil 3 S=M×N; when M is an odd number, the number of turns of coil 3 S=(M-1)×N.

[0080] Since the number of turns N of each layer of coil 3 is rounded downward, there is a gap in the height direction of the winding window. Mica paper (upper mica paper 5 and lower mica paper 6) is pasted on the upper and lower sides of the winding window. The thickness of the mica paper is The added mica paper physically isolates the coil 3 from the coil frame 1 at the bend, thereby increasing insulation reliability.

[0081] The coil winding method of the present invention comprises the following steps:

[0082] Step 1: sandblast the winding window of the coil 3 skeleton to make the surface roughness of the substrate reach 3.2 μm to 6.3 μm.

[0083] Step 2: spray water-based nano paint on the surface of the coil frame 1 after sandblasting, stick mica paper (upper mica paper 5 and lower mica paper 6) on the winding window, and then put it into the oven, heat it to 90℃ and keep it for 8 minutes, then heat it to 280℃ and keep it for 1 hour, cool it in the oven and take it out.

[0084] Step 3: When winding the coil 3, a quartz fiber tube is put on the entrance of the introduction slot 7. The protection range of the tube sleeve is 5 cm from the entrance section to the slope section of the introduction slot 7, which is used to protect the coil 3 at the bend of the entrance section and the insulation in the introduction slot 7.

[0085] Step 4: When the coil 3 is wound to 90° of the winding entrance, the coil 3 is tangent to the winding window in the introduction slot 7, and the coil 3 is flush with the lower surface of the winding window. At this time, the coil 3 is led out from the introduction slot 7 to the innermost side of the winding window, and the winding of the coil 3 begins.

[0086] Step 5: When the coil 3 is fully wound, use a tool to fix the relative position of the coil 3 and the coil frame 1, spray water-based nano paint on the outer surface of the coil 3 to increase the contact area between the coils 3 and reduce the working temperature of the coil 3.

[0087] Step 6: When the coil 3 is wound to the last turn, the coil 3 is led out from the lead-out slot 8.

[0088] Step 7: Put a quartz fiber tube on the tail of the winding inlet and outlet 4. The protection range of the tube sleeve is from the slope of the outlet groove 8 to 5 cm of the outlet section, which is used to protect the insulation of the coil 3 in the outlet section bend and the outlet groove 8.

[0089] Step 8: After the coil 3 is wound, two turns of quartz fiber cloth are wrapped around the outermost layer of the coil 3 to protect the coil 3 and press it tightly. The quartz fiber cloth and the coil 3 are also fixed with water-based nano paint.

[0090] Step 9: Put the processed integral coil frame 1 into the oven, heat it to 90°C and keep it for 8 minutes, then heat it to 280°C and keep it for 1 hour, cool it in the oven and take it out, and complete the winding and curing of the coil 3.

[0091] The synthetic materials of the water-based nano paint in steps 2, 5 and 8 include: component A: a binder, component B: a curing agent, and component C: a thermally conductive insulating material; the preparation process of the water-based nano paint is as follows:

[0092] After stirring component A and component B for 20 to 30 minutes respectively until they are uniform, weigh component A, weigh component B at a weight ratio of A:B=1.4:1, slowly add component B to component A, and stir at a speed of 300 r / min for 4 hours to obtain a mixed solution of components A and B;

[0093] After stirring component C for 20-30 minutes until it is uniform, weigh component C according to the total weight of components A and B: weight of component C = 3:1;

[0094] Add component C to the mixture of components A and B and stir for 20-30 minutes until uniform;

[0095] The above mixture was allowed to stand for 1 hour and then filtered through a 300-400 mesh filter to complete the preparation of the water-based nano paint.

[0096] The present invention is described in detail below with reference to the accompanying drawings and specific data assumed in the background technology.

[0097] The coil 3 uses a 4-level single-core nickel-plated copper conductor and a vacuum fiber wire as an insulating skin. The outer diameter of the coil 3 is φ1 mm.

[0098] The coil frame 1 is made of titanium alloy material, the inner diameter of the coil frame 1 winding is R1, which is 33.5 mm, the winding window height is H, which is 18 mm, the winding window width is L, which is 6.5 mm, the winding inlet and outlet width is q, which is 7 mm, and the maximum height of the winding inlet and outlet is p, which is 3.5 mm.

[0099] The winding window of the coil frame 1 is sprayed with high-temperature insulating paint, and the thickness of the spray paint insulating layer is z, and the thickness of the spray paint here is 50μm.

[0100] The winding of coil 3 cannot exceed the outer envelope of the winding window body.

[0101] The Hall thruster coil frame of the present invention is as follows Figure 12-16 As shown, an introduction slot 7 and an outlet slot 8 are respectively designed in the winding inlet and outlet directions of the winding inlet and outlet 4. The coil 3 is buried in the outlet slot 8, thereby avoiding the problem of the winding inlet and outlet occupying space and the coil 3 not being tightly wound in the existing design.

[0102] The depth d and width w of the introduction groove 7 are both 1.5 mm.

[0103] The lead-in groove 7 and the lead-out groove 8 are chamfered with a chamfer radius of 0.3 mm to protect the coil 3 from being scratched by the edges.

[0104] like Figure 6 and 7 As shown, assuming that the coil 3 is wound counterclockwise, after the coil 3 is wound 90° from the inlet of the introduction slot 7, the inner diameter of the introduction slot 7 is tangent to the winding window, so the introduction slot 7 is horizontally eccentric t toward the winding outlet.

[0105] The inner diameter of the introduction groove 7 is R2 = R1 + t, and the outer diameter of the introduction groove 7 is R3 = R2 + w.

[0106] At the winding inlet and outlet, the outer diameter of the introduction slot 7 is tangent to the outer diameter of the winding window. At this time, when t takes the maximum value, Figure 6 As shown, there is t 2 +(R1+L) 2 ≥R3 2 , we can conclude That is, t≤4.9mm.

[0107] At the winding inlet and outlet, the inner diameter of the introduction slot 7 is at the bottom of the winding inlet slot. At this time, when t takes the minimum value, such as Figure 7 As shown, there are Conclusion That is, t≥3.7mm.

[0108] The eccentricity t of the Hall thruster coil frame of the present invention has an upper limit of 4.9 mm.

[0109] The inner diameter of the introduction groove 7 is R2=R1+t=38.4 mm, and the outer diameter of the introduction groove 7 is R3=R2+w=39.9 mm.

[0110] The size of the middle diameter of the lead-out slot 8 is consistent with the middle diameter of the outermost coil 3, so the inner diameter of the lead-out slot 8 is The outer diameter of the lead-out groove 8 is R5=R4+w=39.8.

[0111] To ensure that the bottom of the coil 3 is supported when the coil 3 is led out from the lead-in slot 7 to the coil frame 1, a slope is set in the lead-out section of the lead-in slot 7 with a slope angle of 10°, and the depth h in the slot at the tangent position of the coil 3 is 1.05 mm.

[0112] Using the winding method of the present invention, the number of winding layers of coil 3 is M is the integer rounded down to 6; the number of turns per layer N is rounded down to an integer of 17, and the number of turns of coil 3 is S=M×N=102.

[0113] Since the number of turns N of each layer of coil is rounded down, there is a gap in the height direction of the winding window. Mica paper is pasted on the upper and lower sides of the winding window. The thickness of the mica paper is

[0114] The winding method of the present invention is as follows, comprising the following steps:

[0115] The winding window of the coil 3 skeleton is sandblasted to make the surface roughness of the substrate reach 3.2μm to 6.3μm;

[0116] The surface of the coil frame 1 after sandblasting is sprayed with water-based nano paint, and the mica paper, including the upper mica paper 5 and the lower mica paper 6, is sprayed with water-based nano paint on the back and then glued to the upper and lower sides of the winding window; then put it into the oven, heat it to 90°C and keep it for 8 minutes, then heat it to 280°C and keep it for 1 hour, and take it out after cooling it in the oven;

[0117] The water-based nano paint is purchased from Kaifeng Quark New Materials Co., Ltd. It consists of three parts: component A: binder, component B: curing agent, and component C: thermal conductive insulation. The preparation process is as follows:

[0118] After stirring components A and B for 20 to 30 minutes each until they are uniform, weigh 140g of component A, weigh 100g of component B according to the weight ratio of A:B=1.4:1, slowly add component B to component A, and stir at a speed of 300r / min for 4h to obtain a mixed solution of components A and B;

[0119] Then stir component C for 20-30 minutes until it is uniform, and weigh 80g of component C according to the total weight of the mixture of components A and B: weight of component C = 3:1;

[0120] Then add component C to the mixture of components A and B and stir for 30 minutes until uniform;

[0121] The above mixture was allowed to stand for 1 hour and then filtered through a 300-mesh filter to complete the preparation of the water-based nano paint.

[0122] When winding the coil 3, a quartz fiber tube is put on the entrance of the introduction slot 7. The protection range of the tube sleeve is from 5 cm of the entrance section to the slope section of the introduction slot 7, which is used to protect the coil 3 at the bend of the entrance section and the insulation in the introduction slot 7;

[0123] When the angle is 90° with the winding inlet, the coil 3 is tangent to the winding window in the introduction slot 7, and the coil 3 is flush with the lower surface of the winding window. At this time, the coil 3 is led out from the introduction slot 7 to the innermost side of the winding window, and the winding of the coil 3 begins;

[0124] When the coil 3 is fully wound, the relative position of the coil 3 and the coil frame 1 is fixed by a tool, and water-based nano paint is sprayed on the outer surface of the coil 3 to increase the contact area between the layers of the coil 3 and reduce the working temperature of the coil 3;

[0125] When the coil 3 is wound to the last turn, the coil 3 is led out from the lead-out slot 8;

[0126] A quartz fiber tube is sheathed at the tail of the winding inlet and outlet 4. The protection range of the tube sheath is from the inner side of the outlet slot 8 to 5 cm from the outlet section, which is used to protect the insulation of the coil 3 at the outlet section.

[0127] After the coil 3 is wound, two turns of quartz fiber cloth are wound around the outermost layer of the coil 3 to protect the coil 3 and press it tightly. The quartz fiber cloth and the coil 3 are also made of water-based nano paint;

[0128] The processed integral coil frame 1 is placed in an oven, heated to 90°C and kept for 8 minutes, then heated to 280°C and kept for 1 hour, and then taken out after being cooled in the oven, thus completing the winding and curing of the coil 3.

[0129] The Hall thruster coil frame of the present invention is designed with an introduction groove and an outlet groove in the direction of the winding inlet and outlet, and the coil is buried in the introduction groove and the outlet groove, thereby avoiding the problem of the winding inlet and outlet occupying space and the coil being loosely wound in the existing design.

[0130] The winding method of the present invention solves the problem of space occupation by the winding inlet and outlet coils, increases the winding compactness and the number of coil turns, and further improves the insulation between the coil and the coil frame.

[0131] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A Hall thruster coil frame, characterized in that: include: A cylindrical coil frame (1); a coil (3) is wound on the coil frame (1) in a circumferential direction; an insulating varnish (2) is provided between the coil (3) and the coil frame (1); a winding inlet and outlet (4) is provided at the bottom of the coil frame (1); The coil frame (1) is provided with an inlet groove (7) and an outlet groove (8) at the positions of the winding inlet and outlet (4). The coil (3) is tangent to the winding window after being wound 90° in the introduction groove (7); the center of the introduction groove (7) is horizontally eccentric in the direction of the winding outlet, and the eccentricity is determined by the inner and outer diameters of the introduction groove (7) within the range of the winding inlet and the outer diameter of the winding window; The lead-out groove (8) and the coil frame (1) are co-centered, and the median diameter of the lead-out groove (8) is consistent with the median diameter of the outermost coil (3).

2. The Hall thruster coil frame according to claim 1, characterized in that: An upper mica paper (5) is provided between the upper end of the coil (3) and the coil frame (1); and a lower mica paper (6) is provided between the lower end of the coil (3) and the coil frame (1).

3. The Hall thruster coil frame according to claim 2, characterized in that: The portion where the introduction groove (7) is tangent to the coil frame (1) is a slope.

4. The Hall thruster coil frame according to claim 2, characterized in that: The lead-out section of the lead-out groove (8) is a slope.

5. The Hall thruster coil frame according to claim 2, characterized in that: The depth and width of the introduction groove (7) are respectively between 1.5φ and 2φ, where φ is the outer diameter of the coil (3).

6. The Hall thruster coil frame according to claim 2, characterized in that: The depth and width of the lead-out groove (8) are respectively between 1.5φ and 2φ, where φ is the outer diameter of the coil (3).

7. A winding method applicable to the Hall thruster coil frame according to any one of claims 2 to 6, characterized in that: The following steps are involved: Step 1: sandblasting the winding window of the coil frame (1) to make the surface roughness of the substrate reach 3.2 μm to 6.3 μm; Step 2: spray water-based nano paint on the surface of the coil frame (1) after sandblasting, stick the upper mica paper (5) and the lower mica paper (6) on the winding window respectively, then put it into the oven, heat it to 90°C and keep it for 8 minutes, then heat it to 280°C and keep it for 1 hour, cool it in the oven and take it out; Step 3: When winding the coil (3), a quartz fiber tube is placed at the entrance of the introduction slot (7), and the protection range of the tube sleeve is from 5 cm of the entrance section to the slope section of the introduction slot (7); Step 4: When the angle with the winding inlet is 90°, the coil (3) is tangent to the winding window in the introduction slot (7), and the coil (3) is flush with the lower surface of the winding window. At this time, the coil (3) is led out from the introduction slot (7) to the innermost side of the winding window, and the winding of the coil (3) begins; Step 5: When the coil (3) is fully wound, the relative position of the coil and the coil frame (1) is fixed by a tool, and the outer surface of the coil (3) is sprayed with water-based nano paint; Step 6: When the coil (3) is wound to the last turn, the coil (3) is led out from the lead-out slot (8); Step 7: Put a quartz fiber tube on the tail of the winding outlet, and the protection range of the tube sleeve is from the slope of the outlet groove (8) to 5 cm of the outlet section; Step 8: After the coil (3) is wound, two turns of quartz fiber cloth are wound around the outermost layer of the coil (3), and the quartz fiber cloth and the coil (3) are fixed with water-based nano paint; Step 9: Place the processed integral coil frame (1) into an oven, heat it to 90°C and keep it for 8 minutes, then heat it to 280°C and keep it for 1 hour, cool it in the oven and take it out, thus completing the winding and curing of the coil (3).

8. The winding method according to claim 7, characterized in that: The synthetic materials of the water-based nano paint in steps 2, 5 and 8 include: component A: a binder, component B: a curing agent, and component C: a thermally conductive insulating material; The preparation process of the water-based nano paint is as follows: After stirring component A and component B for 20 to 30 minutes respectively until they are uniform, weigh component A, weigh component B at a weight ratio of A:B=1.4:1, slowly add component B to component A, and stir at a speed of 300 r / min for 4 hours to obtain a mixed solution of components A and B; After stirring component C for 20-30 minutes until it is uniform, weigh component C according to the total weight of components A and B: weight of component C = 3:1; Add component C to the mixture of components A and B and stir for 20-30 minutes until uniform; The above mixture was allowed to stand for 1 hour and then filtered through a 300-400 mesh filter to complete the preparation of the water-based nano paint.

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