Motor and preparation method of foil type winding

Abstract

The invention discloses a motor and a preparation method of a foil type winding, the foil type winding comprises a plurality of layers of laminated chaffs in the same insulating sleeve, and the adjacent chaffs are in an insulating state; the preparation method comprises the following steps: cutting a metal foil sheet subjected to insulation treatment into metal chaff and rolling the metal chaff into a single-layer chaff roll; overlapping the metal chaff of the plurality of single-layer chaff rolls and rolling the metal chaff into a multi-layer chaff roll; multiple layers of chaff of the multiple layers of chaff rolls are fixed and sleeved with insulating tubes; and the multiple layers of chaff sleeved with the insulating tube are subjected to thermal shrinkage and then rolled. The foil type winding iron core is small in thickness, large in motor power density, tighter in arrangement in the winding process, higher in slot fullness rate, free of winding and simpler and more convenient to process, and the production efficiency is greatly improved through the preparation method. According to the invention, the foil type winding is firstly cut and then overlaid, so that folding marks and edge deformation can be avoided, short circuit is avoided, and the foil type winding is more reliable and firmer when the motor runs.

Description

Technical Field

[0001] The invention belongs to the technical field of windings, and in particular relates to a motor and a method for preparing a foil winding. Background Art

[0002] The existing winding is generally made by winding a wire, which requires winding and casting of the winding. During the winding process, the wire is easily entangled and the slot fill rate is low.

[0003] Therefore, foil windings appeared. The metal foil groups made by traditional methods are generally made of multiple layers of metal foil placed on top of each other and then cut into strips. This overlapping placement can easily cause bending marks inside the multiple layers of metal foil. When cutting, the edges of the metal foil strips can easily deform due to their large thickness. As a winding, short circuits can easily occur when the motor is running.

[0004] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The invention provides a motor and a method for preparing a foil winding, so as to solve the technical problems that the existing foil winding is easily bent and overlapped and easily short-circuited because the foil winding is overlapped and then cut.

[0006] In order to achieve the above invention / design purpose, the present invention adopts the following technical solutions: A method for preparing a foil winding, the foil winding comprising multiple layers of stacked foil strips in the same insulating sleeve, with adjacent foil strips being insulated; the method comprising the following steps: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; The multi-layer foil strips of the insulating tube are heat-shrunk and then rolled up.

[0007] In the method for preparing the foil winding as described above, the multiple layers of foil strips of the multi-layer foil strip roll are fixed at a specific interval.

[0008] According to the preparation method of the foil winding as described above, the fixing clamp for fixing the multi-layer foil strip includes a first clamping portion and a second clamping portion set at a certain angle, the first clamping portion and the second clamping portion are connected by a connecting portion, and the free end of the fixing clamp has an auxiliary clamping portion set opposite to each other. After the multi-layer foil strip enters the fixing clamp, the first clamping portion and the second clamping portion are clamped, and the auxiliary clamping portion and the connecting portion are clamped.

[0009] In the method for preparing the foil winding as described above, the first clamping portion and the second clamping portion are first clamped by two transverse pressure rollers, and then the auxiliary clamping portion and the connecting portion are clamped by two longitudinal pressure rollers.

[0010] In the method for preparing the foil winding as described above, the method for fitting the fixed multi-layer foil strips onto the insulating tube is as follows: a magnetic suction device outside the insulating tube is moved along the direction of the insulating tube to attract the multi-layer foil strips inside the insulating tube to move inside the insulating tube.

[0011] The method for preparing the foil winding as described above comprises inserting the fixed multi-layer foil strips into the insulating tube through a tube inserting device, wherein the tube inserting device comprises: A frame, wherein an insulating tube positioning portion is provided on the frame, and the insulating tube positioning portion is used to position the insulating tube; A conveyor belt is arranged along the direction of the insulating tube, and a magnetic attraction device is provided on the conveyor belt.

[0012] In the above-mentioned method for preparing the foil winding, the insulating tube positioning portion is an insulating tube positioning groove spirally arranged on the frame; the tube threading device comprises: A fan, used for blowing air into the insulating tube; A detachable shell is provided with an air suction device for sucking out the air in the shell.

[0013] In the method for preparing the foil winding as described above, the detachable housing is provided with an insulating tube positioning groove, and an air intake port is provided at a position corresponding to the insulating tube positioning groove, and the air intake port is connected to the air intake device.

[0014] In the method for preparing the foil winding as described above, the conveyor belt is located in the frame, a conveyor roller is provided in the frame, and the conveyor belt circulates on the conveyor roller.

[0015] According to the method for preparing the foil winding as described above, after heat shrinkage, the foil winding is rolled around by a rolling roller and tested by a spark tester before being rolled up.

[0016] A motor comprises a winding, wherein the winding is the above-mentioned foil winding; the motor is an inner stator motor, or an outer stator motor, or a hub motor, or a direct drive motor, or an asynchronous motor.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are: The preparation method of the foil winding of the present invention comprises a plurality of stacked foil strips in the same insulating sleeve, and adjacent foil strips are insulated; the preparation method comprises the following steps: cutting the metal foil treated with insulation into metal foil strips and rolling them into a single-layer foil strip roll; stacking the metal foil strips of a plurality of single-layer foil strip rolls and rolling them into a multi-layer foil strip roll; fixing the multi-layer foil strips of the multi-layer foil strip roll and putting them into an insulating tube; and rolling the multi-layer foil strips put into the insulating tube after heat shrinking. The iron core thickness of the foil winding of the present invention is small, the power density of the motor is large, the arrangement is more compact during the winding process, the slot fill rate is higher, no winding occurs, the processing is simpler, and the preparation method greatly improves the production efficiency. The foil winding of the present invention is cut first and then stacked, which can avoid folding marks and edge deformation, and will not cause short circuit, so that the foil winding is more reliable and firm when the motor is running.

[0018] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the foil winding of the stator motor in a specific embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of a foil winding of a stator motor according to a specific embodiment of the present invention.

[0022] Figure 3 A specific embodiment of the present invention Figure 1 Schematic diagram of a foil winding with the insulation removed.

[0023] Figure 4 It is an enlarged view of the winding end surface of a specific embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of several stacked foil strips according to a specific embodiment of the present invention.

[0025] Figure 6 It is a schematic diagram of a hub motor (with one side of the hub removed) according to a specific embodiment of the present invention.

[0026] Figure 7 Schematic diagram of a direct-drive motor according to a specific embodiment of the present invention.

[0027] Figure 8 Schematic diagram of the foil squirrel cage rotor of the present invention.

[0028] Fig. 9 It is a schematic diagram of an asynchronous motor with a foil-type squirrel cage rotor according to a specific embodiment of the present invention (without the housing).

[0029] Fig.10 It is a schematic diagram of a winding and a winding connecting disk according to a specific embodiment of the present invention.

[0030] Fig.11 It is a schematic diagram of the metal foil cutting and rolling process according to a specific embodiment of the present invention.

[0031] Fig.12 It is a schematic diagram of the stacking process of multiple layers of metal foil strips according to a specific embodiment of the present invention.

[0032] Fig.13 It is a schematic diagram of the process of fixing a multi-layer metal foil strip onto an insulating sleeve in a specific embodiment of the present invention.

[0033] Fig.14 It is a schematic diagram of a metal foil uncoiler according to a specific embodiment of the present invention.

[0034] Fig.15 Schematic diagram of a metal foil cutting machine according to a specific embodiment of the present invention.

[0035] Fig.16 It is a schematic diagram of a metal foil strip winding machine according to a specific embodiment of the present invention.

[0036] Fig.17 It is a schematic diagram of a metal foil strip winding machine according to a specific embodiment of the present invention.

[0037] Fig.18 Schematic diagram of a fixing clip according to a specific embodiment of the present invention.

[0038] Fig.19 It is a schematic diagram of a fixing device according to a specific embodiment of the present invention.

[0039] Fig. 20 It is a schematic diagram of a state in which the outer shell of the pipe penetration device of a specific embodiment of the present invention is opened.

[0040] Fig.21 It is a cross-sectional schematic diagram of a pipe penetration device according to a specific embodiment of the present invention.

[0041] Fig. 22 It is a schematic diagram of a conveyor belt, conveyor roller and magnetic attraction device according to a specific embodiment of the present invention.

[0042] 1. Insulation sleeve; 2. Foil strip; 3. Insulation layer; 4. Short-circuit ring; 5. Winding connection plate; 10. Metal foil unwinder; 101. Metal foil roll bracket; 102. Fixed frame; 103. Motor and transmission; 104. Metal foil roll clamping device; 20. Metal foil cutting machine; 201. Pulling roller; 202. Cutting roller; 203. Cutting roller; 204. Distance adjustment device; 205. Roller cooling device; 206. Waste recovery device; 30. Metal foil strip winder; 40. Metal foil unwinder; 50. Second metal foil strip winder; 60. Fixed clamp device; 61. 01, fixing clamp; 6011, first clamping part; 6012, second clamping part; 6013, connecting part; 6014, auxiliary clamping part; 602, transverse pressure roller; 603, longitudinal pressure roller; 70, pipe threading device; 701, frame; 7011, insulating tube positioning part; 702, conveyor belt; 7021, magnetic suction device; 7022, conveying roller; 703, shell; 7031, insulating tube positioning groove; 7032, air suction port; 80, heat shrink device; 90, winding winder. DETAILED DESCRIPTION

[0043] 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.

[0044] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the implementation method, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0047] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0048] like Figure 4 , 5 As shown, the foil winding includes multiple layers of stacked foil strips 2 in the same insulating sleeve 1 , and adjacent foil strips 2 are insulated from each other, that is, there is an insulating layer 3 between adjacent foil strips 2 .

[0049] Figure 3 yes Figure 1 The schematic diagram of the foil winding after removing the insulating layer shows that the winding includes a plurality of stacked foil strips 2 .

[0050] The foil winding is to use a metal strip foil group instead of a wire to wind the magnetic slot of the stator magnetic ring. The foil groups of the same level entering the magnetic slot and winding out of the magnetic slot are the two ends of the same winding foil group. The metal strip foil group includes a number of parallel metal strip foils wrapped by an insulating layer, wherein the material of the foil can be copper, aluminum or other highly conductive materials; the insulating layer of the parallel foil group can be one of the high-temperature resistant ultra-thin insulating materials such as polyvinyl chloride, cross-linked polyethylene, polypropylene, asbestos and fluorine materials, or one of the insulating paints such as phenolic resin paint, epoxy resin paint, polyurethane paint, acrylate, etc.; the advantage of this is that the end occupies a small space, the busbar structure is simple, and the winding casting and welding are avoided. It is a winding structure with a small core thickness and a high motor power density; the advantage of the foil winding over the wire winding is that the foil winding is arranged more closely during the winding process and the slot fill rate is higher; and during the winding process, since the foil winding is completely surrounded by the insulating layer, the wire will not be entangled during the winding process, which makes the winding easier.

[0051] The foil winding is applied to the inner stator to form an inner stator motor, wherein: Figure 1 It is an inner stator motor foil winding.

[0052] The foil winding is applied to the outer stator to form an outer stator motor, wherein: Figure 2 Schematic diagram of the foil winding of the external stator motor.

[0053] Foil windings are used in wheel hub motors, where: Figure 6 Schematic diagram of the wheel hub motor.

[0054] Foil windings are used in direct drive motors, where: Figure 7 Schematic diagram of a direct drive motor.

[0055] Figure 8 Schematic diagram of a foil squirrel cage rotor. The foil squirrel cage rotor loads the foil winding in the rotor magnetic slot and finally uses bolts or terminal blocks to fix the short-circuit ring 4. The advantage of this is that it reduces the impact of casting and avoids casting defects such as pores and cracks on the metal strip. At the same time, during operation, the motor will not be unable to start normally due to broken strips. Fig. 9 Schematic diagram of an asynchronous motor with a foil squirrel cage rotor.

[0056] exist Fig.10 In the example, the winding connection plate 5 connects the winding and the three-phase power line together to form a passage; the winding connection plate 5 and the winding, and the winding connection plate 5 and the three-phase power line are connected by bolts. In addition to the bolt connection, the winding connection plate 5 can also be welded and connected to the winding.

[0057] A method for preparing a foil winding, the method comprising the following steps: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; The multi-layer foil strips of the insulating tube are heat-shrunk and then rolled up.

[0058] Foil windings can be processed in batches. The process flow for batch processing of foil windings is to first cut the insulated metal foil into strips, then stack multiple metal foil strips into groups, and finally put them into insulating tubes for heat shrinking and rolling.

[0059] Specifically, the process includes the following: 1. Metal foil cutting and winding process: The metal foil sheet after insulation treatment is sent to the metal foil cutting machine 20 through the metal foil unwinding machine 10 to be cut into metal foil strips 2, which are wound by the metal foil strip winding machine 30, and the remaining waste is recycled. Fig.11 The example in the figure shows that the rolls are arranged in 4 rows horizontally and 10 columns vertically.

[0060] In some embodiments, a 58m long, 90mm wide, and 0.3mm thick metal foil that has been electroplated and insulated is unrolled by a metal foil unwinder 10, sent to a metal foil cutter 20 and cut into 40 metal foil strips that are 58m long, 2mm wide, and 0.3mm thick, and then wound up by a metal foil strip winder 30, and excess metal foil waste is recycled.

[0061] The metal foil roll is placed on the bracket of the metal foil unwinding machine 10, and is unwound at a uniform speed by the metal foil unwinding machine 10; Fig.14As shown, the metal foil uncoiler 10 includes a metal foil roll bracket 101, a fixed frame 102, a motor and a transmission 103, a metal foil roll clamping device 104 and a control box; a locking mechanism is installed in the metal foil roll clamping device 104, and when the axis of the locking mechanism is rotated, the outer side of the shaft cylinder can be stretched open, so that the metal foil roll bracket 101 is fixed on the shaft cylinder.

[0062] The metal foil unrolled by the metal foil unwinder 10 enters the traction roller 201 of the metal foil cutting machine 20, and the traction roller 201 adjusts the angle of the metal foil sheet, and then the metal foil sheet is pulled to the cutting roller 202, and then cut to 80 mm width by the cutting roller 202, and the excess metal foil waste is rolled up by the waste recovery device; and the 80 mm metal foil entering the cutting roller 203 is cut into 40 2 mm wide metal foil strips by the cutting roller 203; Fig.15 As shown, the metal foil cutting machine 20 includes a distance adjusting device 204, a roller cooling device 205, a pulling roller 201, a trimming roller 202, a cutting roller 203, a waste recycling device 206, a lubrication device, a motor and a gearbox, and a control box.

[0063] like Fig.16 As shown, the cut metal foil strips are transmitted to the metal foil strip winding machine 30, which is composed of 40 metal foil strip winding devices, 4 sets of motors and transmissions, a frame, etc.; the 40 metal foil strip winding devices respectively wind up the 40 metal foil strips transmitted by the metal foil cutting machine; a knob is installed in the middle of the metal foil strip winding device, and the outer ring can be expanded to fix the metal foil roll bracket by rotating the knob with a four-corner wrench.

[0064] 2. Metal foil strip stacking process: A plurality of rolled foil strip rolls are placed on the metal foil strip unwinder 40. The metal foil strips arranged up and down are stacked and rolled into a multi-layer foil strip roll by the second metal foil strip winder 50.

[0065] Fig.12 In the example, four single-layer metal foil strips in each column arranged up and down form a group, and 10 groups are arranged horizontally. The 10 groups of single-layer metal foil strips are placed on the metal foil strip unwinder 40 and are rolled into 10 groups by the second metal foil strip winder 50, each group having 4 layers of foil strips.

[0066] The rolled metal foil strip roll is placed at the center of the metal foil strip winding device shaft cylinder of the metal foil strip unwinder 40, and the metal foil strip roll is manually tightened and fixed. The metal foil strip winder 30 and the metal foil strip unwinder 40 are the same equipment, and the internal mechanical devices are exactly the same; the shift turntable of the metal foil strip winder 30 is manually rotated to relatively move the four rows of frames of the metal foil strip winder 30 so that the metal foil strip winding devices in the same row are aligned, and the metal foil strip unwinder 40 is formed; the shift turntable of the metal foil strip unwinder 40 is manually rotated to relatively move the four rows of frames of the metal foil strip unwinder 40 so that the metal foil strip winding devices in the same row are staggered, and the metal foil strip winder 30 is formed. Fig.17 As shown, the rolled-up state is a front schematic diagram, and the unrolled state is a back schematic diagram.

[0067] The structure and function of the metal foil strip winding device are exactly the same as the metal foil strip unwinding device. The only difference is the direction of the motor. The motor rotates counterclockwise for unwinding and clockwise for winding.

[0068] The metal foil strip unwinder 40 and the metal foil strip winding device of the second metal foil strip winder 50 are aligned one by one, and the motors of the unwinder and the winder are started at the same time, and the shaft cylinder is rolled to roll the 40 metal foil strips into 10 groups. The second metal foil strip winder 50 is composed of 10 side-by-side metal foil strip winding devices, a group of motors and transmissions, a frame, etc.

[0069] 3. The process of putting the four-layer metal foil group (four-layer foil strip) on the insulating tube: the rolled four-layer metal foil strip is fixed with a fixing clamp and then enters the tube-threading device 70. The magnet attracts the multi-layer metal foil strip fixed by the fixing clamp to move in the insulating tube, so that the insulating tube completely wraps the metal foil strip, and then sends it to the constant temperature heat shrink device 80 for heat shrinkage, and finally sends it to the winding coiling machine 90. Fig.13 shown.

[0070] After being unwound by the metal foil strip unwinder, the multi-layer metal foil strips enter the fixing clamp device 60. The metal foil group passing through the fixing device is fixed with fixing clamps every 1m, so that the layers of metal strips in the metal foil group no longer move relative to each other. Then the metal foil group enters the insulating tube fixed by the suction cup in the tube threading device 70. The magnet attracts the metal foil group fixed by the fixing clamp to move toward the end of the insulating tube. After the 58m long metal foil group is completely covered with the 80m insulating tube, it is sent to the constant temperature heat shrink device 80 for heat shrinkage, so that the insulating tube tightly wraps the metal foil group, and finally sent to the winding winder 90 for winding.

[0071] The multi-layer foil strips of the multi-layer foil strip roll are fixed at a specific interval.

[0072] like Fig.18As shown, the fixing clip 601 for fixing the multi-layer foil strip comprises a first clamping portion 6011 and a second clamping portion 6012 arranged at a certain angle, the first clamping portion 6011 and the second clamping portion 6012 are connected by a connecting portion 6013, and the free end of the fixing clip has an auxiliary clamping portion 6014 arranged opposite to each other. The fixing clip 601 is made of metal.

[0073] After the multi-layer foil strip enters the fixing clamp 601 , the first clamping portion 6011 and the second clamping portion 6012 are clamped, and the auxiliary clamping portion 6014 and the connecting portion 6013 are clamped.

[0074] like Fig.19 As shown, the fixing device first clamps the first clamping portion 6011 and the second clamping portion 6012 through two transverse pressure rollers 602 , and then clamps the auxiliary clamping portion 6014 and the connecting portion 6013 through two longitudinal pressure rollers 603 .

[0075] The metal foil group enters the fixing device, and the magnetic plate under the conveyor belt attracts the fixing clamp 601. The metal foil group passes through the middle of the fixing clamp 601, and the transverse pressure roller 602 tightly fits the fixing clamp 601 to the metal foil group in the horizontal direction; when the metal foil group passes through the longitudinal pressure roller 603, the fixing clamp 601 will further tighten the metal foil group in the vertical direction.

[0076] The method for fitting the fixed multi-layer foil strips onto the insulating tube is as follows: a magnetic suction device outside the insulating tube is moved along the direction of the insulating tube to attract the multi-layer foil strips inside the insulating tube to move inside the insulating tube.

[0077] The fixed multi-layer foil strip is put into the insulating tube by the tube-threading device 70, such as Figure 20-22 As shown, the pipe-piercing device 70 includes: The frame 701 is provided with an insulating tube positioning portion 7011 for positioning the insulating tube. The insulating tube positioning portion 7011 is an insulating tube positioning groove spirally provided on the frame 701 .

[0078] The conveyor belt 702 is arranged along the direction of the insulating tube, and the conveyor belt 702 is also arranged in a spiral. A magnetic attraction device 7021 is arranged on the conveyor belt 702. The conveyor belt 702 is located in the frame 701, and a conveyor roller 7022 is arranged in the frame 701, and the conveyor belt 702 circulates on the conveyor roller 7022.

[0079] The fan is used to blow air into the insulating tube to expand the insulating tube.

[0080] The detachable shell 703 is provided with an air suction device for sucking out the air in the shell 703 .

[0081] An insulating tube positioning groove 7031 is provided on the detachable housing 703 , and an air intake port 7032 is provided at a position corresponding to the insulating tube positioning groove 7031 , and the air intake port 7032 is connected to the air intake device.

[0082] The tightened metal foil group enters the tube-piercing device 70. A conveyor belt 702 is installed on the inner side of the frame 701 of the tube-piercing device 70. A magnetic device 7021 is fixed on the conveyor belt 702. The magnetic device 7021 on the conveyor belt 702 drives the metal foil group to move along the insulating tube, so that the metal foil group penetrates the insulating tube fixed in the insulating tube positioning part 7011.

[0083] The pipe-threading device 70 includes two side shells 703 and a plurality of vacuum suction ports 7032 , an ultra-thin aluminum frame 701 , a built-in conveyor belt 702 , a motor, a controller and a transmission, etc.

[0084] Before the pipe threading device starts working, it is necessary to first cut an 80m long insulating pipe and manually place the insulating pipe in the insulating pipe positioning part 7011 of the frame 701, use a fan to blow up the insulating pipe, and the insulating pipe protrudes from the insulating pipe positioning part 7011, close and lock the shell 703, so that the protruding part of the insulating pipe is placed in the insulating pipe positioning groove 7031 in the shell 703 on both sides; start the suction device of the shell 703, so that the frame 701 and the shell 703 are combined into a vacuum structure, so that the insulating pipe fits seamlessly in the insulating pipe positioning groove 7031 of the shell 703; the insulating pipe positioning part 7011 in the aluminum frame 701 and the built-in conveyor belt 702 of the pipe threading device are both spiral-shaped, and the built-in conveyor belt 702 is driven by two sets of conveying rollers 7022, and magnetic suction devices 7021 are distributed on the conveyor belt 702 every 1m, and the magnetic suction devices 7021 pull the metal foil group in the insulating pipe to move forward in a spiral.

[0085] After passing through the insulating tube, the metal foil group is pulled by the rolling roller of the constant temperature heat shrink device 80 to the inner cavity for heating and shrinking; the constant temperature heat shrink device 80 includes a fan and a fan baffle, and two layers of upper and lower heaters. The constant temperature heat shrink device 80 is also equipped with a continuous constant temperature device and a temperature detection device, which can shrink the insulating tube entering the cavity of the heat shrink device 80 in time; a heat dissipation port is set on the shell of the constant temperature heat shrink device 80.

[0086] After heat shrinking, it is rolled up after being rolled around by a rolling roller and tested by a spark tester.

[0087] Since the distance from the tube threading device to the winding reeling device is too long, and the outer foil layer of the metal foil group is actually longer than the inner foil layer, in order to ensure that the foils in the metal foil group are always in a parallel and fitted state, after the heat shrinkage of the insulating tube of the metal foil group is completed, it needs to be pulled to the rolling roller for a circle every 0.8m before entering the next process.

[0088] The insulating foil group after heat shrinkage needs to be tested by a spark tester to see if the insulation performance is reliable. When the leakage foil group passes through the tiny bead chain in the spark tester, the tester will issue a warning and find out where the leakage is.

[0089] After the insulating foil group is tested, it is reeled by the winding reel 90. The winding reel 90 has the same mechanical structure as the second metal foil strip unwinder. When working, the rolling roller of the constant temperature heat shrink machine needs to be calibrated and aligned with the winding device of the winding reel.

[0090] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A method for preparing a foil winding, wherein the foil winding comprises multiple layers of stacked foil strips in the same insulating sleeve, and adjacent foil strips are insulated; characterized in that: The preparation method comprises the following steps: Cutting the insulating metal foil into metal foil strips and rolling them into single-layer foil strip rolls; stacking and rolling up the metal foil strips of a plurality of single-layer foil strip rolls into a multi-layer foil strip roll; Fix the multi-layer foil strips of the multi-layer foil strip roll and put them into the insulating tube; The multi-layer foil strips of the insulating tube are heat-shrunk and then rolled up.

2. The method for preparing a foil winding according to claim 1, characterized in that: The fixing clamp for fixing the multi-layer foil strip includes a first clamping part and a second clamping part set at a certain angle, the first clamping part and the second clamping part are connected by a connecting part, and the free end of the fixing clamp has an auxiliary clamping part set opposite to each other. After the multi-layer foil strip enters the fixing clamp, the first clamping part and the second clamping part are clamped, and the auxiliary clamping part and the connecting part are clamped.

3. The method for preparing a foil winding according to claim 2, characterized in that: First, the first clamping portion and the second clamping portion are clamped by two transverse pressure rollers, and then the auxiliary clamping portion and the connecting portion are clamped by two longitudinal pressure rollers.

4. The method for preparing a foil winding according to claim 1, characterized in that: The method for putting the fixed multi-layer foil strip on the insulating tube is: a magnetic suction device outside the insulating tube is moved along the direction of the insulating tube to attract the multi-layer foil strip in the insulating tube to move in the insulating tube.

5. The method for preparing a foil winding according to claim 4, characterized in that: The fixed multi-layer foil strip is mounted on the insulating tube by a tube-piercing device, and the tube-piercing device comprises: A frame, wherein an insulating tube positioning portion is provided on the frame, and the insulating tube positioning portion is used to position the insulating tube; A conveyor belt is arranged along the direction of the insulating tube, and a magnetic attraction device is provided on the conveyor belt.

6. The method for preparing a foil winding according to claim 5, characterized in that: The insulating tube positioning portion is an insulating tube positioning groove spirally arranged on the frame; the tube insertion device includes: A fan, used for blowing air into the insulating tube; A detachable shell is provided with an air suction device for sucking out the air in the shell.

7. The method for preparing a foil winding according to claim 6, characterized in that: The detachable shell is provided with an insulating tube positioning groove, and a suction port is provided at a position corresponding to the insulating tube positioning groove, and the suction port is connected to the suction device.

8. The method for preparing a foil winding according to claim 5, characterized in that: The conveyor belt is located in the frame, a conveyor roller is arranged in the frame, and the conveyor belt circulates on the conveyor roller.

9. The method for preparing a foil winding according to claim 1, characterized in that: After heat shrinking, it is rolled up after being rolled around by a rolling roller and tested by a spark tester.

10. A motor, characterized in that: The motor includes a winding, and the winding is a foil winding as described in any one of claims 1 to 9; the motor is an inner stator motor, or an outer stator motor, or a hub motor, or a direct drive motor, or an asynchronous motor.

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