Helical non-magnetic tooth armature stator and assembly method thereof

Abstract

The present invention discloses a spiral non-magnetic tooth armature stator and an assembly method thereof, the stator can be applied to a superconducting excitation motor, the stator includes a stator core and an armature winding, the stator core is formed by laminating silicon steel sheets, the armature winding is installed in the stator core, the stator also includes an outer insulating support frame, an inner insulating support frame and a soft insulating cylinder, a plurality of first armature winding installation grooves are provided along a circumferential spiral on the inner circumferential surface of the outer insulating support frame, a plurality of second armature winding installation grooves are provided along a circumferential spiral on the outer circumferential surface of the inner insulating support frame, the armature winding is installed in the first armature winding installation groove and the second armature winding installation groove, and the soft insulating cylinder is interference-fitted between the outer insulating support frame and the inner insulating support frame. The present application improves the space occupancy rate of the armature winding, thereby improving the power density of the motor; and provides effective support for the armature winding, improves the support stability of the armature winding, thereby making the motor run more reliable.

Description

Technical Field

[0001] The present application relates to the technical field of superconducting excitation motors, and in particular to a spiral non-magnetic tooth armature stator and an assembly method thereof. Background Art

[0002] A superconducting excitation motor refers to a motor whose armature winding is made of superconducting materials and is wound with wires that can carry high-density currents under strong magnetic fields. The armature of a superconducting excitation motor can generate a strong magnetic field that saturates the stator teeth, and the air-gap armature structure without magnetic teeth increases the upper limit of the number of turns per phase of the armature winding, further increasing the voltage level of the armature winding. However, as the voltage increases, the insulation thickness of the armature winding gradually increases, which poses a challenge to the cooling of the motor, especially the cooling of the end of the armature winding is particularly difficult. Therefore, many armature windings in the prior art use a spiral armature winding structure to reduce the end space and reduce the pressure of end cooling.

[0003] In terms of insulation, the traditional spiral armature winding wraps each turn of the armature winding with relative insulation, thus omitting a series of complex insulation designs. However, in a high-voltage environment, the cooling of the winding needs to be completed within the insulation layer due to the thick insulation, which greatly increases the difficulty of engineering implementation. At the same time, a large amount of armature space is occupied by insulation materials, and the power density of the motor is seriously reduced. In terms of fixed support, most traditional spiral windings use laminated fixed constraints. Lamination is to press the cylindrical insulation cylinder, multi-layer spiral armature winding and cooling pipe layer on the inner surface of the stator core through high-strength structural parts. However, the insulation layer of this laminated structure uses soft insulation, which causes the stator armature winding to deviate due to gravity, and the air gap structure is prone to eccentricity. At the same time, the soft insulation cannot effectively suppress the radial and axial displacement of the armature winding due to force vibration, making the motor operation reliability poor. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the purpose of the present application is to provide a spiral non-magnetic tooth armature stator and an assembly method thereof, which can increase the space occupancy rate of the armature winding, thereby increasing the power density of the motor; and can provide effective support for the armature winding, enhance the support stability of the armature winding, thereby making the motor operation more reliable.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] The spiral non-magnetic tooth armature stator comprises a stator core and an armature winding, wherein the stator core is formed by stacking silicon steel sheets; the armature winding is installed in the stator core; the spiral non-magnetic tooth armature stator also comprises an outer insulating support frame, an inner insulating support frame and a soft insulating cylinder, wherein the stator core, the outer insulating support frame, the inner insulating support frame and the soft insulating cylinder are all in the shape of a circular ring column, the stator core is sleeved on the outer periphery of the outer insulating support frame, the inner side of the stator core is fixedly matched with the outer side of the outer insulating support frame, and the outer insulating support frame is sleeved on the outer periphery of the inner insulating support frame; a plurality of first armature winding installation grooves are provided on the inner side of the outer insulating support frame, the plurality of first armature winding installation grooves are arranged in a spiral along the circumference of the outer insulating support frame, and the plurality of first armature winding installation grooves are arranged in a spiral along the circumference of the outer insulating support frame. The slot openings of the slots are located on the inner circumferential surface of the outer insulating support frame, and a plurality of second armature winding mounting slots are opened on the outer side of the inner insulating support frame. The plurality of second armature winding mounting slots are arranged in a circumferential spiral along the inner insulating support frame, and the slot openings of the plurality of second armature winding mounting slots are located on the outer circumferential surface of the inner insulating support frame. The spiral directions of the first armature winding mounting slot and the second armature winding mounting slot are opposite, and an armature winding is installed in each first armature winding mounting slot and each second armature winding mounting slot; the soft insulating tube is interference fit between the outer insulating support frame and the inner insulating support frame so that the outer insulating support frame and the inner insulating support frame are relatively fixed, and the soft insulating tube isolates the first armature winding mounting slot and the second armature winding mounting slot.

[0007] As a preferred technical solution, the side wall surface of the first armature winding mounting groove is recessed inward to form a first armature winding cooling channel, the first armature winding cooling channel extends along the extension direction of the first armature winding mounting groove, and both ends of the first armature winding cooling channel pass through the outer insulating support frame; the side wall surface of the second armature winding mounting groove is recessed inward to form a second armature winding cooling channel, the second armature winding cooling channel extends along the extension direction of the second armature winding mounting groove, and both ends of the second armature winding cooling channel pass through the inner insulating support frame.

[0008] As a preferred technical solution, the soft insulating tube includes a glass fiber reinforced plastic inner layer and a polyimide film wrapping layer, and the polyimide film wrapping layer is wrapped on the surface of the glass fiber reinforced plastic inner layer.

[0009] As a preferred technical solution, a plurality of support frame mounting grooves are provided on the inner side of the stator core, the plurality of support frame mounting grooves are arranged at intervals along the circumference of the stator core, the support frame mounting grooves extend along the axial direction of the stator core, the groove openings of the support frame mounting grooves are located on the inner circumferential surface of the stator core, and a plurality of support frame mounting protrusions corresponding to the plurality of support frame mounting grooves are provided on the outer side of the external insulating support frame, the support frame mounting protrusions are at least partially located in the support frame mounting grooves and are clamped with the support frame mounting grooves.

[0010] As a preferred technical solution, a cross-sectional plane perpendicular to the axial direction of the stator core is defined, and the cross-sections of the support frame mounting protrusion and the support frame mounting groove cut by the cross-sectional plane are both trapezoidal, and the spiral non-magnetic tooth armature stator includes an elastic insulating gasket, which is arranged on both sides of the support frame mounting protrusion and between the support frame mounting groove.

[0011] As a preferred technical solution, the spiral non-magnetic tooth armature stator also includes two end pressure plates arranged at opposite axial ends of the spiral non-magnetic tooth armature stator, the two end pressure plates are pressed against the two ends of the inner insulating support frame and the outer insulating support frame, the two ends of the inner insulating support frame are provided with a plurality of first card grooves along the circumference of the inner insulating support frame, the two ends of the outer insulating support frame are provided with a plurality of second card grooves along the circumference of the outer insulating support frame, the second card grooves pass through the radial direction of the outer insulating support frame, the end pressure plates are provided with a plurality of teeth corresponding to the plurality of first card grooves and the plurality of second card grooves, the teeth are inserted into the second card grooves to realize the circumferential displacement constraint of the end pressure plates and the outer insulating support frame, and the teeth are inserted into the first card grooves to realize the circumferential displacement constraint of the end pressure plates and the inner insulating support frame.

[0012] As a preferred technical solution, the inner end of the latching tooth is provided with a latching protrusion on one side or both sides for pressing the inner insulating support frame toward the soft insulating tube along the radial direction of the inner insulating support frame.

[0013] As a preferred technical solution, the spiral non-magnetic tooth armature stator also includes a plurality of fixing frames, which are arranged on the outer periphery of the stator core along the circumferential direction of the stator core, and the fixing frames extend along the axial direction of the stator core. Press-fit fixing parts for press-fitting end pressure plates and the stator core are provided at both ends of the fixing frames. The press-fit fixing parts at both ends of the fixing frames press the two end pressure plates toward the stator core along the axial direction of the stator core respectively.

[0014] As a preferred technical solution, both ends of the first armature winding mounting groove and the second armature winding mounting groove are in the shape of straight segments along the axial direction of the spiral non-magnetic tooth armature stator, and both ends of the armature winding are provided with wiring ends in the shape of straight segments, and both ends of the first armature winding mounting groove and the second armature winding mounting groove are installed in cooperation with the wiring ends.

[0015] The present application also provides an assembly method for a spiral non-magnetic tooth armature stator, comprising the following steps: assembling the armature windings from the inner circumference of the inner insulating support frame one by one into each second armature winding installation groove of the inner insulating support frame; inserting the inner insulating support frame into the soft insulating tube axially; assembling the armature windings from the inner circumference of the outer insulating support frame one by one into each first armature winding installation groove of the outer insulating support frame, and inserting the soft insulating tube into the outer insulating support frame axially; completing the end connection of the armature winding; pressing the outer insulating support frame into the stator core axially; press-fitting two end pressure plates on the two ends of the stator core respectively, so that each clamping tooth of the end pressure plate is inserted into the corresponding first clamping groove and second clamping groove on the inner insulating support frame and the outer insulating support frame; installing each fixing frame to the outer periphery of the stator core, so that each fixing frame clamps the stator core and the end pressure plates at both ends of the stator core; and sleeve the stator outer tube onto each fixing frame.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] 1. The armature winding of the spiral non-magnetic tooth armature stator in the prior art needs to be wrapped with thick insulating material, so a large amount of armature space is occupied by the insulating material, resulting in a serious decrease in the power density of the motor. However, the spiral non-magnetic tooth armature stator of the present application uses an external insulating support frame and an internal insulating support frame to fix and support the armature winding, and serves as the insulating material for the armature winding slot insulation and main insulation. Therefore, the armature winding of the present application does not need to be wrapped with thick insulating material, so the space occupancy rate of the armature winding in the motor is increased, thereby improving the power density of the motor.

[0018] 2. The spiral non-magnetic tooth armature stator of the present application elementizes the armature winding support structure, and the soft insulating tube is interference-fitted between the outer insulating support frame and the inner insulating support frame, so that each armature winding can be pressed and fixed in each first armature winding mounting groove, and each armature winding can be pressed and fixed in each second armature winding mounting groove. Therefore, on the one hand, the present application can conveniently realize the assembly of the spiral non-magnetic tooth armature stator; on the other hand, since each armature winding is pressed and fixed in each first armature winding mounting groove or second armature winding mounting groove, the armature winding will not be offset during the operation of the motor, which provides effective support for the armature winding and improves the stability of the armature winding support, thereby making the motor operation more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the spiral non-magnetic tooth armature stator of the present application;

[0020] Figure 2 An exploded view of the spiral non-magnetic tooth armature stator of the present application;

[0021] Figure 3This is a schematic diagram of the structure of the outer insulating support frame of the spiral non-magnetic tooth armature stator of the present application;

[0022] Figure 4 This is a schematic diagram of the structure of the inner insulating support frame of the spiral non-magnetic tooth armature stator of the present application;

[0023] Figure 5 A cross-sectional view of the helical non-magnetic tooth armature stator of the present application cut by a cutting plane defined in the specific embodiment;

[0024] Figure 6 for Figure 5 A partial enlarged view of the middle A;

[0025] Figure 7 This is a schematic diagram of the end surface structure of the spiral non-magnetic tooth armature stator of the present application;

[0026] Figure 8 This is a schematic structural diagram of the end face pressure plate of the spiral non-magnetic tooth armature stator of the present application;

[0027] Fig. 9 for Figure 8 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.

[0029] It should be noted that the words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantitative limitation, but indicate the existence of at least one. "Multiple" or "several" means at least two. Unless otherwise specified, words such as "front", "back", "left", "right", "bottom" and / or "top" are only for the convenience of description and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0030] The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] like Figure 1 and Figure 2 As shown, the present application provides a spiral non-magnetic tooth armature stator 100, which includes a stator core 1 and an armature winding 24. The stator core 1 is a component of the magnetic circuit of the superconducting excitation motor, and the stator core 1 is formed by stacking silicon steel sheets. The armature winding 24 is installed in the stator core 1, and the armature winding 24 can generate a magnetic field.

[0032] like Figure 2 , Figure 3 and Figure 4 As shown, the spiral non-magnetic tooth armature stator 100 further includes an armature winding support component 2 , and the armature winding support component 2 includes an outer insulating support frame 21 , an inner insulating support frame 22 and a soft insulating cylinder 23 .

[0033] The stator core 1, the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating cylinder 23 are all in the shape of an annular column. Since the rotor rotates around its own axis when the spiral non-magnetic tooth armature stator 100 is working, the stator core 1 needs to be arranged in an annular column to form a circumferentially uniform magnetic field. At the same time, each armature winding 24 also needs to be evenly arranged around the circumference of the rotor, so the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating cylinder 23 are arranged in an annular column, which can facilitate the armature winding 24 to be evenly arranged around the circumference of the rotor. In addition, the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating cylinder 23 arranged in an annular column also facilitate the coordination and installation between the stator core 1, the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating cylinder 23.

[0034] The stator core 1 is sleeved on the outer periphery of the outer insulating support frame 21, the inner side of the stator core 1 is fixedly matched with the outer side of the outer insulating support frame 21, and the outer insulating support frame 21 is sleeved on the outer periphery of the inner insulating support frame 22. The inner side of the stator core 1 refers to the side away from the inner periphery of the stator core 1; the outer side of the outer insulating support frame 21 refers to the side away from the outer periphery of the outer insulating support frame 21; the outer periphery of the outer insulating support frame 21 refers to the circumference of the outer side of the outer insulating support frame 21; the outer periphery of the inner insulating support frame 22 refers to the circumference of the outer side of the inner insulating support frame 22.

[0035] like Figure 2 , Figure 5 and Figure 6As shown, the soft insulating tube 23 is interference-fitted between the outer insulating support frame 21 and the inner insulating support frame 22, so that the outer insulating support frame 21 and the inner insulating support frame 22 are relatively fixed. The interference fit of the soft insulating tube 23 is used to compress and fix the outer insulating support frame 21 and the inner insulating support frame 22 in the radial direction; and the friction between the soft insulating tube 23 and the outer insulating support frame 21 and the inner insulating support frame 22 under the interference fit is used to further achieve the relative fixation of the outer insulating support frame 21 and the inner insulating support frame 22 in the axial direction and the circumferential direction.

[0036] like Figure 2 and Figure 3 As shown, the outer insulating support frame 21 is provided with a plurality of first armature winding installation grooves 211, and the plurality of first armature winding installation grooves 211 are arranged spirally along the circumference of the outer insulating support frame 21. The notches of the first armature winding installation grooves 211 are located on the inner circumference of the outer insulating support frame 21. Figure 2 and Figure 4 As shown, the inner insulating support frame 22 is provided with a plurality of second armature winding installation grooves 221, and the plurality of second armature winding installation grooves 221 are arranged in a circumferential spiral along the inner insulating support frame 22. The notch of the second armature winding installation groove 221 is located on the outer circumferential surface of the inner insulating support frame 22. The spiral direction of the first armature winding installation groove 211 is opposite to that of the second armature winding installation groove 221. In the present application, the first armature winding installation groove 211 is arranged in a clockwise spiral (right-handed); the second armature winding installation groove 221 is arranged in a counterclockwise spiral (left-handed). An armature winding 24 is installed in each first armature winding installation groove 211 and each second armature winding installation groove 221.

[0037] The soft insulating tube 23 isolates the first armature winding installation groove 211 and the second armature winding installation groove 221 to achieve insulation between the armature winding 24 on the outer insulating support frame 21 and the armature winding 24 on the inner insulating support frame 22 .

[0038] After the armature windings 24 are installed, the armature windings 24 installed on the outer insulating support frame 21 form an outer spiral winding layer, and the armature windings 24 installed on the inner insulating support frame 22 form an inner spiral winding layer.

[0039] Since the adjacent armature windings 24 of the outer spiral winding layer are separated by the outer insulating support frame 21, and the adjacent armature windings 24 of the inner spiral winding layer are separated by the inner insulating support frame 22, the outer insulating support frame 21 and the inner insulating support frame 22 realize the inter-slot insulation (phase-to-phase insulation) of the armature windings 24 installed in the first armature winding mounting groove 211 and the second armature winding mounting groove 221.

[0040] Since the outer spiral winding layer and the inner spiral winding layer are separated by the soft insulating cylinder 23, the soft insulating cylinder 23 realizes interlayer insulation between the inner and outer spiral winding layers.

[0041] Since the surface of the armature winding 24 in the first armature winding installation slot 211 is wrapped by the outer insulating support frame 21 and the soft insulating tube 23, and the surface of the armature winding 24 in the second armature winding installation slot 221 is wrapped by the inner insulating support frame 22 and the soft insulating tube 23, the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating tube 23 realize the main insulation of the armature winding 24. The main insulation of the armature winding 24 refers to the insulation between the armature winding 24 and the stator core 1, and between different armature windings 24. In the prior art, it is generally realized by using thick insulating materials wrapped on the surface of the armature winding 24 strands.

[0042] The spiral non-magnetic tooth armature stator 100 of the present application uses an outer insulating support frame 21 and an inner insulating support frame 22 to fix and support the armature winding 24, and serves as an insulating material for the slot insulation and main insulation of the armature winding 24. Therefore, the armature winding 24 of the present application does not need to be wrapped with a thick insulating material, thereby increasing the space occupancy rate of the armature winding 24 in the motor, thereby increasing the power density of the motor.

[0043] The present application can conveniently realize the assembly of the spiral non-magnetic tooth armature stator 100: the soft insulating tube 23 is interference fit between the outer insulating support frame 21 and the inner insulating support frame 22, so that each armature winding 24 is pressed and fixed in each first armature winding mounting groove 211, and each armature winding 24 is pressed and fixed in each second armature winding mounting groove 221; the outer insulating support frame 21 is pressed into the stator core 1, so that the stator core 1 and the outer insulating support frame 21 can be fixedly assembled.

[0044] The spiral non-magnetic tooth armature stator 100 of the present application, since each armature winding 24 is pressed and fixed in each first armature winding mounting groove 211 or second armature winding mounting groove 221, the armature winding 24 will not be offset during the operation of the motor, which provides effective support for the armature winding 24 and improves the stability of the support for the armature winding 24, thereby making the motor operation more reliable.

[0045] In the present application, the outer insulating support frame 21 and the inner insulating support frame 22 are made of materials such as glass fiber reinforced plastics and EPGC (epoxy resin glass cloth) laminates. Glass fiber reinforced plastics and EPGC laminates have high strength and high voltage resistance, and provide fixed support for the inner and outer spiral winding layers, and serve as insulating materials for the inter-slot insulation and main insulation of the armature winding 24. The voltage resistance of glass fiber reinforced plastics is about 10~20kV / mm, that is, each millimeter of glass fiber reinforced plastic can withstand a voltage of 10~20kV. Therefore, the present application simultaneously achieves fixed support and reliable insulation of the armature winding 24.

[0046] In the present application, the soft insulating cylinder 23 includes a glass fiber reinforced plastic inner layer and a polyimide film wrapping layer, and the polyimide film wrapping layer is wrapped on the surface of the glass fiber reinforced plastic inner layer. The glass fiber reinforced plastic has high strength and high pressure resistance to achieve fixed support between the outer insulating support frame 21 and the inner insulating support frame 22, and serves as an insulating material for interlayer insulation between the armature winding 24 on the outer insulating support frame 21 and the armature winding 24 on the inner insulating support frame 22. The polyimide film is used as a soft wrapping layer of the soft insulating cylinder 23 to achieve an interference fit between the soft insulating cylinder 23 and the outer insulating support frame 21 and the inner insulating support frame 22. In addition, the polyimide film also has excellent thermal stability and insulation performance.

[0047] As an implementation method, the inner side of the stator core 1 and the outer side of the outer insulating support frame 21 are fixed by snap-fitting. Figure 2 As shown, the stator core 1 is provided with a plurality of support frame mounting grooves 11, and the plurality of support frame mounting grooves 11 are arranged at intervals along the circumference of the stator core 1. The support frame mounting grooves 11 extend along the axial direction of the stator core 1, and the notches of the support frame mounting grooves 11 are located on the inner circumference of the stator core 1. The outer side surface of the outer insulating support frame 21 is provided with a plurality of support frame mounting protrusions 213 corresponding to the plurality of support frame mounting grooves 11, and the support frame mounting protrusions 213 are at least partially located in the support frame mounting grooves 11 and are engaged with the support frame mounting grooves 11. The outer insulating support frame 21 is inserted into the stator core 1 so that the support frame mounting protrusions 213 are engaged with the support frame mounting grooves 11, thereby realizing the circumferential displacement constraint of the outer insulating support frame 21 and the stator core 1.

[0048] As a way to achieve this, Figure 2 , Figure 3 and Figure 4 As shown, both ends of the first armature winding installation slot 211 and the second armature winding installation slot 221 are in the shape of straight segments along the axial direction of the spiral non-magnetic tooth armature stator 100, and both ends of the armature winding 24 are provided with straight segment-shaped wiring ends 241. Both ends of the first armature winding installation slot 211 and the second armature winding installation slot 221 are installed in coordination with the wiring ends 241. The wiring ends 241 at both ends of the armature winding 24 are in the shape of straight segments, so as to facilitate the wiring of the armature winding 24 on the outer insulating support frame 21 and the armature winding 24 on the inner insulating support frame 22.

[0049] Several armature windings 24 are arranged in the form of Robel transposition. The so-called "transposition" means that the multiple strands of wire inside the armature winding 24 are cross-transposed in the straight section of the armature winding 24. By changing the spatial position of the wire, the magnetic flux of the cross-linked strands of the wires is made as balanced as possible, and a basically equal induced potential is generated to eliminate the internal circulation in the armature winding 24 and reduce the loss of the armature winding 24. It can be seen that each strand of wire that constitutes the armature winding 24 is not a straight line with the same length as the armature winding 24, but each strand of wire is slightly longer than the length of the armature winding 24, because it is necessary to braid and transpose in the straight section of the armature winding 24. This armature winding 24 that has been braided and transposed is called a Robel wire rod, that is, a braided wire rod. Robel transposition is a prior art and will not be repeated in this application.

[0050] As a way to achieve this, Figure 3 , Figure 5 and Figure 6 As shown, the side wall of the first armature winding installation slot 211 is recessed inward to form a first armature winding cooling channel 212, and the first armature winding cooling channel 212 extends along the extension direction of the first armature winding installation slot 211, and both ends of the first armature winding cooling channel 212 pass through the outer insulating support frame 21. Figure 4 , Figure 5 and Figure 6 As shown, the side wall surface of the second armature winding installation groove 221 is recessed inward to form a second armature winding cooling channel 223, and the second armature winding cooling channel 223 extends along the extension direction of the second armature winding installation groove 221, and both ends of the second armature winding cooling channel 223 penetrate the inner insulating support frame 22. After the cooling medium passes through the first armature winding cooling channel 212 and the second armature winding cooling channel 223, since the cooling medium is in direct contact with the surface of the armature winding 24, it can take away the surface heat of the armature winding 24, thereby cooling the armature winding 24. The cooling medium passing through the first armature winding cooling channel 212 and the second armature winding cooling channel 223 can be insulating cooling oil or air, etc. Since the first armature winding cooling channel 212 is formed by the inward depression of the side wall surface of the first armature winding mounting groove 211, it is possible to avoid the armature winding 24 in the first armature winding mounting groove 211 blocking the first armature winding cooling channel 212, thereby improving the cooling effect; since the second armature winding cooling channel 223 is formed by the inward depression of the side wall surface of the second armature winding mounting groove 221, it is possible to avoid the armature winding 24 in the second armature winding mounting groove 221 blocking the second armature winding cooling channel 223, thereby improving the cooling effect.

[0051] The armature winding 24 of the present application does not need to be wrapped with thick insulating material, so the surface of the armature winding 24 can directly contact the cooling medium in the first armature winding cooling channel 212 or the second armature winding cooling channel 223, thereby achieving rapid cooling and heat dissipation of the armature winding 24 to improve the cooling effect.

[0052] As an implementation method, a cross-sectional plane perpendicular to the axial direction of the stator core 1 is defined, and the cross-sections of the first armature winding cooling channel 212 and the second armature winding cooling channel 223 cut by the cross-sectional plane are both trapezoidal, so that the cooling medium has a larger contact area with the wall surface of the first armature winding cooling channel 212 and the second armature winding cooling channel 223 to improve the cooling effect. It can be understood that the cross-sections of the first armature winding cooling channel 212 and the second armature winding cooling channel 223 cut by the cross-sectional plane can also be other shapes such as semicircular.

[0053] Specifically, Figure 2 , Figure 5 and Figure 6 As shown, the cross-sections of the support frame mounting protrusion 213 and the support frame mounting groove 11 cut by the above-mentioned cutting plane are both trapezoidal. The cross-sections of the support frame mounting protrusion 213 and the support frame mounting groove 11 cut by the cutting plane are set to be trapezoidal, so that the pressure on the stator core 1 on the side of the support frame mounting groove 11 is dispersed into two forces along the tangent and radial directions of the stator core 1. Similarly, the pressure on the side of the support frame mounting protrusion 213 of the outer insulating support frame 21 is dispersed into two forces along the tangent and radial directions of the outer insulating support frame 21, thereby avoiding the stator core 1 at the support frame mounting groove 11 and the outer insulating support frame 21 at the support frame mounting protrusion 213 from being crushed.

[0054] As another optional implementation, the cross-sections of the support frame mounting protrusion 213 and the support frame mounting groove 11 cut by the above-mentioned cutting plane can also be semicircular or other shapes.

[0055] The spiral non-magnetic tooth armature stator 100 includes an elastic insulating gasket 3, which is arranged between the two sides of the support frame mounting protrusion 213 and the support frame mounting groove 11. During the operation of the spiral non-magnetic tooth armature stator 100, the stator core 1 is easily expanded due to heat, and the thermal expansion of the stator core 1 is likely to cause the structure between the stator core 1 and the external insulating support frame 21 to become loose. Since the elastic insulating gasket 3 is provided in the present application, after the stator core 1 is thermally expanded, the elastic insulating gasket 3 itself undergoes elastic deformation and expands, thereby avoiding the structural loosening caused by the thermal expansion of the stator core 1.

[0056] In the present application, the elastic insulating gasket 3 is made of materials such as polyimide film, low-resistance anti-corona tape and high-resistance anti-corona tape to meet the following requirements: good insulation performance, strong plasticity, high elasticity and insoluble in grease.

[0057] As a way to achieve this, Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the spiral non-magnetic tooth armature stator 100 further includes two end pressure plates 4, which are arranged at opposite ends of the spiral non-magnetic tooth armature stator 100 in the axial direction and are used to constrain the axial displacement of the stator core 1 and the armature winding support component 2. The axial displacement constraint of the armature winding support component 2 by the end pressure plates 4 includes axial displacement constraint of the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating cylinder 23.

[0058] As an implementation method, a plurality of first slots 224 are provided at both ends of the inner insulating support frame 22 along the circumference of the inner insulating support frame 22, and a plurality of second slots 214 are provided at both ends of the outer insulating support frame 21 along the circumference of the outer insulating support frame 21, and the second slots 214 pass through the radial direction of the outer insulating support frame 21. A plurality of latch teeth 41 corresponding to the plurality of first slots 224 and the plurality of second slots 214 are provided on the end pressure plate 4.

[0059] The latch 41 is inserted into the second slot 214 to realize the circumferential displacement constraint of the end plate 4 and the outer insulating support frame 21, and the latch 41 is inserted into the first slot 224 to realize the circumferential displacement constraint of the end plate 4 and the inner insulating support frame 22. Therefore, the end plate 4 realizes the circumferential fixation of the outer insulating support frame 21 and the inner insulating support frame 22. The latch 41 abuts against the bottom of the second slot 214 to realize the axial displacement constraint of the end plate 4 and the outer insulating support frame 21, and the latch 41 abuts against the bottom of the first slot 224 to realize the axial displacement constraint of the end plate 4 and the inner insulating support frame 22.

[0060] Specifically, Figure 8 and Fig. 9 As shown, the inner end of the latch 41 is provided with a latch protrusion 411 on one or both sides. When the latch 41 is mounted in the first latch groove 224, the latch protrusion 411 presses the inner insulating support frame 22 toward the soft insulating tube 23 along the radial direction of the inner insulating support frame 22, so that the inner insulating support frame 22 generates a pressing force toward the soft insulating tube 23, so that the soft insulating tube 23 is interference-fitted between the inner insulating support frame 22 of the outer insulating support frame 21. The inner end of the latch 41 refers to the end of the latch 41 close to the axis of the end pressure plate 4.

[0061] In the present application, the inner end of the latching tooth 41 is in a T-shape. It is understandable that the inner end of the latching tooth 41 may also be in other shapes such as a C-shape.

[0062] As a way to achieve this, Figure 1 and Figure 2As shown, the spiral non-magnetic tooth armature stator 100 also includes a plurality of fixing frames 6, which are arranged on the outer periphery of the stator core 1 along the circumferential direction of the stator core 1, and the fixing frames 6 extend along the axial direction of the stator core 1. Press-fit fixing portions 61 are provided at both ends of the fixing frames 6, and the press-fit fixing portions 61 are used to press-fit the end pressing plates 4 and the stator core 1. The press-fit fixing portions 61 at both ends of the fixing frames 6 respectively press the two end pressing plates 4 along the axial direction of the stator core 1 toward the two ends of the stator core 1 and the armature winding support component 2, so as to realize the axial displacement constraint of the end pressing plates 4 and the stator core 1, the outer insulating support frame 21, the inner insulating support frame 22 and the soft insulating cylinder 23.

[0063] As an implementation method, the spiral non-magnetic tooth armature stator 100 also includes a stator outer cylinder and a stator inner cylinder. The stator outer cylinder is sleeved outside a plurality of fixing frames 6, and a stator core cooling channel is formed between two side walls of two adjacent fixing frames 6, the inner wall of the stator outer cylinder, and the outer wall of the stator core 1. After the cooling medium passes through the stator core cooling channel, since the cooling medium is in direct contact with the outer wall of the stator core 1, it can take away the heat of the outer wall of the stator core 1, thereby cooling the stator core 1. The cooling medium passing through the stator core cooling channel can be insulating cooling oil or air. A cooling medium accommodating space is formed between the stator inner cylinder and the stator outer cylinder. The stator inner cylinder and the stator outer cylinder wrap the stator core 1 and the armature winding 24 inside, and insulating cooling oil or air is passed into the cooling medium accommodating space to achieve cooling and heat dissipation of the stator core 1 and the armature winding 24.

[0064] Through the above technical solution, the helical non-magnetic tooth armature stator 100 of the present application can achieve the following beneficial effects:

[0065] 1. The insulation requirements of the armature winding of the spiral non-magnetic tooth armature stator 100 are met.

[0066] In order to take into account the cooling and fixed support of the armature winding 24 of the spiral non-magnetic tooth armature stator 100, the present application replaces part of the traditional soft insulating material with hard insulating material. At present, the hard insulating material with better insulation effect is mainly glass fiber reinforced plastic, which can withstand a voltage of about 10~20kV per 1mm thickness. The outer insulating support frame 21 and the inner insulating support frame 22 made of glass fiber reinforced plastic and the soft insulating cylinder 23 made of soft insulating material are used to achieve various insulation of the armature winding 24:

[0067] 1.1, the inter-turn insulation withstand voltage is low and the insulation thickness is thin, which has a low impact on the heat dissipation of the armature winding 24;

[0068] 1.2. According to the arrangement of the armature winding 24, a layer of soft insulation is required between two adjacent columns of armature windings 24 in a single slot of the armature winding 24. Considering that there are already two layers of inter-turn insulation between the two armature windings 24, the thickness of the soft insulation is very thin, and it only needs to be slightly thicker than the inter-turn insulation.

[0069] 1.3. The armature winding 24 slot insulation and phase belt insulation are insulated by an external insulating support frame 21 or an internal insulating support frame 22. The thickness of the external insulating support frame 21 and the internal insulating support frame 22 needs to withstand a voltage of 0.87 times the phase voltage to ground;

[0070] 1.4, the insulation between the stator core 1 and the rotor copper shielding layer is completely realized by glass fiber reinforced plastic material;

[0071] 1.5, the insulation between the two layers of armature windings 24 is realized by a composite of glass fiber reinforced plastic and soft insulating material. The soft insulating cylinder 23 is made of solid glass fiber reinforced plastic inside and wrapped with soft insulating material outside, which plays the role of insulation and also plays the role of fastening and supporting;

[0072] 1.6. The insulation of the end connection wires of the armature winding 24 needs to be wrapped with both a glass fiber reinforced plastic pressure plate and soft insulation. On the one hand, the glass fiber reinforced plastic pressure plate is used to achieve the insulation of the end connection to the ground. On the other hand, the line-to-line thick soft insulation is used to wrap the cross-pole end connection to prevent the potential difference between the crossed end connections from breaking through the insulation.

[0073] 2. The fixed support of the inner and outer spiral winding layers of the armature winding 24 is achieved.

[0074] The support of the armature winding 24 needs to consider the relative fixation of the inner and outer layers, the positioning between the entire armature winding support component 2 and the stator core 1, and the displacement constraints of the armature winding support component 2 in the axial, radial and circumferential directions. Based on the feasibility of assembly and manufacturing, the support structure is decomposed into several support components, and the integrity and support reliability of the armature winding 24 are achieved through mutual transfer and coordination: the corresponding design details are as follows:

[0075] 2.1. The spiral directions of the armature windings 24 of the inner and outer spiral winding layers are opposite, so that the thread directions of the first armature winding mounting groove 211 and the second armature winding mounting groove 221 on the outer insulating support frame 21 and the inner insulating support frame 22 are also opposite. The mutual fixation between the outer insulating support frame 21 and the inner insulating support frame 22 needs to rely on two aspects: on the one hand, a composite of soft insulating material and fiberglass is used, and the soft insulating tube 23 is set between the outer insulating support frame 21 and the inner insulating support frame 22, and the outer insulating support frame 21 and the inner insulating support frame 22 are fastened by interference fit of the soft insulating tube 23. The mutual friction force generated by the interference fit constrains the circumferential displacement of the outer insulating support frame 21 and the inner insulating support frame 22; on the other hand, an end pressure plate 4 is used to cooperate with the first card groove 224 and the second card groove 214 at the ends of the two outer insulating support frames 21 and the inner insulating support frame 22 to achieve circumferential mutual fixation between the outer insulating support frame 21 and the inner insulating support frame 22.

[0076] 2.2, the positioning and fixing of the armature winding 24 relative to the stator core 1 depends on the mutual cooperation between the support frame mounting protrusion 213 of the external insulating support frame 21 and the support frame mounting groove 11 of the stator core 1. The number of the support frame mounting groove 11 and the support frame mounting protrusion 213 needs to be more than 3 to form displacement constraints in all directions. At the same time, in order to prevent the stator core 1 from thermal expansion during operation and cause the structural parts to loosen, the support frame mounting grooves 11 of the stator core 1 need to be filled with elastic insulating gaskets 3.

[0077] 2.3, the axial displacement constraint of the outer insulating support frame 21 and the inner insulating support frame 22 depends on the end pressure plates 4 on both sides and the fixing frame 6 outside the stator core 1. The fixing frame 6 and the stator outer tube are pressed against each other, and the stator outer tube and the motor housing are pressed against each other.

[0078] 3. Improved cooling effect of the helical non-magnetic tooth armature stator 100

[0079] Design the corresponding cooling channel according to the heat source distribution of the spiral armature winding 24, and consider using oil or ventilation for cooling:

[0080] 3.1. For the spiral armature winding 24, the first armature winding cooling channel 212 or the second armature winding cooling channel 223 is directly distributed on both sides of each armature winding 24. The armature winding 24 is in direct contact with the cooling medium, and the cooling effect is good.

[0081] 3.2. For the stator core 1, ventilation or oil cooling is adopted in the stator core cooling channel 9.

[0082] 3.3, the stator core cooling channel 9 needs to coordinate pressure and flow rate with the first armature winding cooling channel 212 and the second armature winding cooling channel 223 to avoid the cooling medium flowing too slowly in one of the channels.

[0083] The assembly method of the above-mentioned spiral non-magnetic tooth armature stator 100 comprises the following steps:

[0084] Step 1, assemble the armature windings 24 from the inner circumference of the inner insulating support frame 22 into the second armature winding installation grooves 221 of the inner insulating support frame 22 one by one;

[0085] Step 2, inserting the inner insulating support frame 22 into the soft insulating tube 23 along the axial direction;

[0086] Step 3, assembling the armature windings 24 from the inner circumference of the outer insulating support frame 21 into the first armature winding installation grooves 211 of the outer insulating support frame 21 one by one;

[0087] Step 4, inserting the soft insulating tube 23 into the outer insulating support frame 21 along the axial direction;

[0088] Step 5, completing the end connection of the armature winding 24;

[0089] Step 6, elastic insulating gaskets 3 are placed on both sides of the support frame mounting protrusion 213, and the outer insulating support frame 21 is pressed into the stator core 1 along the axial direction;

[0090] Step 7, press-fit the two end pressing plates 4 onto the two ends of the armature winding support component 2 and the stator core 1, respectively, so that the teeth 41 of the end pressing plates 4 are inserted into the corresponding first slots 224 and second slots 214 on the inner insulating support frame 22 and the outer insulating support frame 21;

[0091] Step 8: Install each fixing frame 6 to the outer periphery of the stator core 1 so that each fixing frame 6 clamps the stator core 1 and the end pressure plates 4 at both ends of the stator core 1 .

[0092] It should be noted that the order of step 3, step 4 and step 1, step 2 can be reversed, that is, step 3, step 4 can be performed first, and then step 1, step 2.

[0093] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. Helical non-magnetic tooth armature stator, including: A stator core, wherein the stator core is formed by laminating silicon steel sheets; An armature winding, the armature winding being installed in the stator core; It is characterized in that The spiral non-magnetic tooth armature stator also includes an outer insulating support frame, an inner insulating support frame and a soft insulating cylinder. The stator core, the outer insulating support frame, the inner insulating support frame and the soft insulating cylinder are all in the shape of a circular column. The stator core is sleeved on the outer periphery of the outer insulating support frame. The inner side of the stator core is fixedly matched with the outer side of the outer insulating support frame. The outer insulating support frame is sleeved on the outer periphery of the inner insulating support frame. A plurality of first armature winding mounting grooves are provided on the inner side of the outer insulating support frame, the plurality of first armature winding mounting grooves are arranged in a circumferential spiral along the outer insulating support frame, and the notches of the plurality of first armature winding mounting grooves are located on the inner circumferential surface of the outer insulating support frame, a plurality of second armature winding mounting grooves are provided on the outer side of the inner insulating support frame, the plurality of second armature winding mounting grooves are arranged in a circumferential spiral along the inner insulating support frame, and the notches of the plurality of second armature winding mounting grooves are located on the outer circumferential surface of the inner insulating support frame, the spiral directions of the first armature winding mounting groove and the second armature winding mounting groove are opposite, and one armature winding is installed in each of the first armature winding mounting groove and each of the second armature winding mounting groove; The soft insulating tube is interference fit between the outer insulating support frame and the inner insulating support frame so that the outer insulating support frame and the inner insulating support frame are relatively fixed, and the soft insulating tube isolates the first armature winding installation groove and the second armature winding installation groove.

2. The helical non-magnetic tooth armature stator according to claim 1, characterized in that: The side wall surface of the first armature winding mounting groove is recessed inward to form a first armature winding cooling channel, the first armature winding cooling channel extends along the extension direction of the first armature winding mounting groove, and both ends of the first armature winding cooling channel pass through the outer insulating support frame; the side wall surface of the second armature winding mounting groove is recessed inward to form a second armature winding cooling channel, the second armature winding cooling channel extends along the extension direction of the second armature winding mounting groove, and both ends of the second armature winding cooling channel pass through the inner insulating support frame.

3. The helical non-magnetic tooth armature stator according to claim 1, characterized in that: The soft insulating cylinder comprises a glass fiber reinforced plastic inner layer and a polyimide film wrapping layer, wherein the polyimide film wrapping layer wraps the surface of the glass fiber reinforced plastic inner layer.

4. The helical non-magnetic tooth armature stator according to claim 1, characterized in that: A plurality of support frame mounting grooves are provided on the inner side of the stator core, the plurality of support frame mounting grooves are arranged at intervals along the circumference of the stator core, the support frame mounting grooves extend along the axial direction of the stator core, the notches of the support frame mounting grooves are located on the inner circumferential surface of the stator core, and a plurality of support frame mounting protrusions corresponding to the plurality of support frame mounting grooves are provided on the outer side of the external insulating support frame, the support frame mounting protrusions are at least partially located in the support frame mounting grooves and are clamped with the support frame mounting grooves.

5. The helical non-magnetic tooth armature stator according to claim 4, characterized in that: A cross-sectional plane perpendicular to the axial direction of the stator core is defined, and the cross-sections of the support frame mounting protrusion and the support frame mounting groove cut by the cross-sectional plane are both trapezoidal, and the spiral non-magnetic tooth armature stator includes an elastic insulating gasket, which is arranged on both sides of the support frame mounting protrusion and between the support frame mounting groove.

6. The helical non-magnetic tooth armature stator according to claim 1, characterized in that: The spiral non-magnetic tooth armature stator also includes two end pressure plates arranged at opposite axial ends of the spiral non-magnetic tooth armature stator, the two end pressure plates are pressed against the two ends of the inner insulating support frame and the outer insulating support frame, the two ends of the inner insulating support frame are provided with a plurality of first card grooves along the circumference of the inner insulating support frame, the two ends of the outer insulating support frame are provided with a plurality of second card grooves along the circumference of the outer insulating support frame, the second card grooves pass through the radial direction of the outer insulating support frame, the end pressure plate is provided with a plurality of teeth corresponding to the plurality of first card grooves and the plurality of second card grooves, the teeth are snapped into the second card groove to realize the circumferential displacement constraint of the end pressure plate and the outer insulating support frame, and the teeth are snapped into the first card groove to realize the circumferential displacement constraint of the end pressure plate and the inner insulating support frame.

7. The helical non-magnetic tooth armature stator according to claim 6, characterized in that: The inner end of the latching tooth is provided with a latching protrusion on one side or both sides for pressing the inner insulating support frame toward the soft insulating cylinder along the radial direction of the inner insulating support frame.

8. The helical non-magnetic tooth armature stator according to claim 6, characterized in that: The spiral non-magnetic tooth armature stator also includes a plurality of fixing frames, which are arranged on the outer periphery of the stator core along the circumferential direction of the stator core, and the fixing frames extend along the axial direction of the stator core. Press-fit fixing parts for press-fitting end pressure plates and the stator core are provided at both ends of the fixing frames. The press-fit fixing parts at both ends of the fixing frames respectively press the two end pressure plates toward the stator core along the axial direction of the stator core.

9. The helical non-magnetic tooth armature stator according to claim 1, characterized in that: Both ends of the first armature winding mounting groove and the second armature winding mounting groove are in the shape of straight line segments along the axial direction of the spiral non-magnetic tooth armature stator, and both ends of the armature winding are provided with connection ends in the shape of straight line segments, and both ends of the first armature winding mounting groove and the second armature winding mounting groove are installed in cooperation with the connection ends.

10. A method for assembling a spiral non-magnetic tooth armature stator, characterized in that: The following steps are involved: Assemble the armature windings one by one from the inner circumference of the inner insulating support frame into the second armature winding installation grooves of the inner insulating support frame; Insert the inner insulating support frame into the soft insulating tube along the axial direction; Assemble the armature windings one by one from the inner circumference of the outer insulating support frame into the first armature winding installation grooves of the outer insulating support frame, and insert the soft insulating tube into the outer insulating support frame along the axial direction; Complete the end wiring of the armature winding; Press the outer insulating support frame into the stator core along the axial direction; Press-fit the two end pressure plates onto the two ends of the stator core respectively, so that the respective clamping teeth of the end pressure plates are inserted into the corresponding first clamping grooves and second clamping grooves on the inner insulating support frame and the outer insulating support frame; Install each fixing frame to the outer periphery of the stator core so that each fixing frame clamps the stator core and the end pressure plates at both ends of the stator core; Put the stator outer cylinder onto each fixing frame.

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