Single-pitch forming hard winding embedding structure and transposition winding method

Abstract

The present application belongs to the technical field of electric machines, and particularly relates to a single-pitch formed hard winding embedding structure and a transposition winding method, comprising a machine shell, a stator core, a single-pitch formed hard winding, a circular arc insulation support block and a slot wedge. The machine shell is arranged outside the circular surface of the stator core. The inner circular surface of the stator core is annularly provided with Z parallel teeth and completely open embedding slots which are uniformly distributed and even in number. Each parallel tooth is sleeved with a single-pitch formed hard winding of y=1. Each embedding slot is provided with two straight edges of the single-pitch formed hard winding arranged in a left-right arrangement structure. The end part is provided with a circular arc insulation support block to axially support the single-pitch formed hard winding. The inner circular diameter of the stator core is radially embedded into the groove in the parallel tooth slot opening part by the slot wedge to fasten the straight edges of the two windings. The present application is convenient to install, can be quickly assembled, has good stability, high installation efficiency and is suitable for mass production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to a single-pitch formed hard winding embedding structure and transposition winding method. BACKGROUND

[0002] An electric machine refers to an electromagnetic device that realizes electric energy conversion or transmission according to electromagnetic induction law, and a stator of the electric machine is an important component of a generator and a starter. The stator is composed of a stator core, a stator winding and a machine base, and the main function of the stator is to generate a rotating magnetic field. The stator winding refers to a winding installed on the stator, that is, copper wire wound on the stator, and the winding is a collective term of a plurality of coils or coil groups constituting a phase or an entire electromagnetic circuit. According to the shape of the coil winding and the embedding and wiring method, the electric motor can be divided into two types of concentrated type and distributed type. According to the form of embedding and wiring arrangement, the distributed winding can be divided into two types of concentric type and lap type.

[0003] The ordinary stator winding of the electric machine usually adopts a distributed winding form with a pitch spanning several slots, and the distributed winding is divided into two types of single-layer winding and double-layer winding according to the in-slot arrangement.

[0004] The double-layer winding must be transposed and crossed between the upper layer and the lower layer at the winding end portion because the two straight sides are respectively located in the upper layer and the lower layer of the spanned slots, which leads to inconvenient embedding of the double-layer winding, low embedding efficiency and unsuitability for mass production.

[0005] For the formed hard winding, even if the winding end portion transposition is for a large span, the operation is very difficult, and a large upper and lower transition transposition torsion nose must be designed at the end portion. Especially for the single-pitch double-layer hard winding with a pitch y=1, the double-layer transposition at the end portion is difficult to be performed according to the traditional method, and if the in-slot arrangement structure and embedding method of the distributed double-layer winding are adopted, the operation will be very difficult. SUMMARY

[0006] In order to solve the above technical problems, the present application provides a single-pitch formed hard winding embedding structure and transposition winding method, which is convenient to install, can be quickly assembled, has good stability, is high in installation efficiency and is suitable for mass production.

[0007] The single-pitch forming hard winding embedding structure of the application solves the above technical problems, comprising a casing, a stator core, single-pitch forming hard windings, circular arc insulation supporting blocks and slot wedges. The casing is arranged outside the circular surface of the stator core. The inner circular surface of the stator core is annularly provided with Z parallel teeth and completely open embedding slots which are evenly spaced and even in number. Each parallel tooth is sleeved with a single-pitch forming hard winding of y=1. The two linear edges of each embedding slot are arranged in a left-right arrangement structure, and the end part is supported and tightened in the axial direction by the circular arc insulation supporting block. The inner circular diameter of the stator core is fastened with the two winding linear edges by embedding the slot wedge into the groove provided at the slot opening part of the parallel tooth.

[0008] The embedding structure is further provided with slot insulation arranged between the two linear edges of the single-pitch forming hard winding.

[0009] The slot insulation is slot insulation paper.

[0010] In the optimization scheme, the forming hard winding is a single-pitch winding of y=1, and the single-pitch forming hard winding is a double-row flat conductor single coil formed by grouping and flat winding of enameled flat copper wires.

[0011] In the further optimization scheme, the coil inner circle is pressed with a 45° transposition bend to form a copper wire outside lead-out structure facilitating the end forming connection. This structure makes the embedding of the forming hard winding simple and convenient, can be quickly assembled, and is suitable for mass production.

[0012] The binding rope is used to fix the single-pitch forming hard winding and the coil.

[0013] The single-pitch forming hard winding is formed by connecting two double-row coils in series or in parallel.

[0014] The stator core is formed by stacking whole sections of fan-shaped silicon steel punched sheets with a thickness of 0.5 mm according to the designed axial length, to form an integral stator core composed of Z parallel teeth, an equal number of completely open embedding slots, and a core yoke connecting the tooth parts. The number of slots of the embedding slot is equal to the number of teeth Z and is even, and the parallel teeth and the embedding slots are spaced apart and uniformly distributed in the circumference.

[0015] The groove is a rectangular groove located at the slot opening part of the parallel tooth and mounting the slot wedge.

[0016] In the present application, each single-pitch forming hard winding is respectively sleeved on the parallel teeth of the stator core, the two straight edges of the winding are respectively located on the same layer in the adjacent slots on both sides of the parallel teeth, and the slot insulation paper for isolation insulation is arranged in the embedded wire slot. The two straight edges of each embedded wire slot are arranged in a left-right arrangement structure, thus forming a left-right arrangement embedded wire structure of the single-pitch forming hard winding with a pitch y=1 in the same layer in the slot, the end part is supported and tightened in the axial direction by the arc insulation support block, and the end part of the winding is cross-bound firmly through the hole of the arc insulation support block by the binding rope, and the rectangular slot wedge is embedded in the groove opened at the radial direction of the inner circle of the core and fastened at the slot opening part of the parallel teeth.

[0017] The winding method in the present application comprises the following steps:

[0018] (1) first, a 45° transposition bend with a height equal to the width of the flat copper wire is molded in the middle of the length of the whole flat copper wire along the thickness direction;

[0019] (2) then, the 45° transposition bend is taken as the starting point, and the double-row flat wire single coil is wound in the upward and downward double rows respectively in the positive and negative directions along the width direction on the mold for a specified number of turns, so that the coil lead-out wires are located on the outside of the double-row flat wire single coil;

[0020] (3) then, the two groups of double-row coils wound according to the above method are combined in the reverse direction, and then firmly brazed at the end part, so that a single forming hard winding with more turns is formed in series, and the winding is completed.

[0021] In the step (3), the two groups of double-row coils are combined in the same direction to form a single forming hard winding in parallel, and the lead-out wires of the forming hard winding after combination are also located on the outside, which is convenient for the end part forming connection.

[0022] The present application is suitable for the left-right arrangement embedded wire structure of the single-pitch double-layer hard winding, and the method is the method of pressing a 45° bend in the inner circle of the forming winding. The beneficial effects of the single-pitch forming hard winding transposition winding and embedded structure provided by the present application are as follows:

[0023] Firstly, the proposed 45° bend in the inner circle solves the problem of transposition at the end part of the single-pitch forming hard winding;

[0024] Secondly, the forming hard winding further forms an outside lead-out structure which is convenient for series-parallel combination;

[0025] Thirdly, the single-pitch forming hard winding can be further standardized and mass-produced;

[0026] Fourthly, the single-pitch forming hard winding is further simplified in embedding, and the end part lead-out connection is also faster and more convenient; therefore, the structure is convenient to install, can be quickly assembled, has good stability, is high in installation efficiency, and is suitable for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. Other related drawings can also be obtained by those skilled in the art without any creative effort, on the premise of not paying any creative effort.

[0028] Figure 1 The three-dimensional structure schematic diagram of the embedded structure provided in the embodiments of the present application;

[0029] Figure 2 The three-dimensional structure schematic diagram of the single-pitch formed hard winding inner circle provided in the embodiments of the present application;

[0030] Figure 3 The three-dimensional structure schematic diagram of the single-pitch formed hard winding reverse combination series provided in the embodiments of the present application;

[0031] Figure 4 The three-dimensional structure schematic diagram of the single-pitch formed hard winding same direction combination parallel provided in the embodiments of the present application;

[0032] Figure 5 The two-dimensional plane structure schematic diagram of the single-pitch formed hard winding slot arrangement and insulation structure provided in the embodiments of the present application;

[0033] Figure 6 The two-dimensional plane structure schematic diagram of the single-pitch formed hard winding end support fastening structure and binding method provided in the embodiments of the present application;

[0034] Figure 7 The three-dimensional structure schematic diagram of the stator core provided in the embodiments of the present application;

[0035] In the drawings, the specific identification is as follows: 1. machine shell, 2. single-pitch formed hard winding, 3. stator core, 4. flat-wound double-row flat wire single coil, 5. circular arc insulation support block, 6. slot insulation paper, 7. slot wedge, 8. parallel teeth, 9. wire embedding groove, 10. core magnetic yoke, 11. rectangular groove, 14. binding rope, Z. number of teeth DETAILED DESCRIPTION

[0036] The present application will be further described in combination with the specific embodiments as follows:

[0037] Embodiment 1

[0038] A single-pitch forming hard winding embedding structure is provided with a machine shell, a stator core, a single-pitch forming hard winding, a circular arc insulation support block and a slot wedge. The machine shell is arranged outside the circular surface of the stator core. The inner circular surface of the stator core is annularly provided with Z parallel teeth and completely open embedding slots which are evenly spaced and even in number. A single-pitch forming hard winding with y=1 is sleeved on each parallel tooth. Two straight edges of the single-pitch forming hard winding are arranged in a left-right arrangement structure in each embedding slot. The end part is supported and tightened in the axial direction by the circular arc insulation support block. The radial direction of the inner circle of the stator core is embedded into the groove at the slot opening part of the parallel tooth slot by the slot wedge to fasten the two winding straight edges.

[0039] The stator core is formed by stamping silicon steel sheets with a thickness of 0.5 mm into a whole section according to the designed axial length, forming a whole stator core composed of Z parallel teeth, an equal number of completely open embedding slots and a core yoke connecting the tooth parts. The number of slots is equal to the number of teeth Z and is even. The parallel teeth and the embedding slots are spaced from each other and uniformly distributed in the circumference. Rectangular grooves for installing slot wedges are arranged at the slot opening part of the parallel teeth.

[0040] The forming hard winding is a single-pitch winding with y=1. The single-pitch forming hard winding is a double-row flat wire single coil formed by grouping and flat winding of enameled flat copper wires. The two groups of double-row coils are connected in parallel in the same direction.

[0041] Example 2

[0042] A single-pitch forming hard winding embedding structure is provided with a machine shell, a stator core, a single-pitch forming hard winding, a circular arc insulation support block and a slot wedge. The machine shell is arranged outside the circular surface of the stator core. The inner circular surface of the stator core is annularly provided with Z parallel teeth and completely open embedding slots which are evenly spaced and even in number. A single-pitch forming hard winding with y=1 is sleeved on each parallel tooth. Two straight edges of the single-pitch forming hard winding are arranged in a left-right arrangement structure in each embedding slot. The end part is supported and tightened in the axial direction by the circular arc insulation support block. The radial direction of the inner circle of the stator core is embedded into the groove at the slot opening part of the parallel tooth slot by the slot wedge to fasten the two winding straight edges. The embedding structure is also provided with slot insulation between the two straight edges of the single-pitch forming hard winding. The slot insulation is slot insulation paper.

[0043] The stator core is formed by stamping silicon steel sheets with a thickness of 0.5 mm into a whole section according to the designed axial length, forming a whole stator core composed of Z parallel teeth, an equal number of completely open embedding slots and a core yoke connecting the tooth parts. The number of slots is equal to the number of teeth Z and is even. The parallel teeth and the embedding slots are spaced from each other and uniformly distributed in the circumference. Rectangular grooves for installing slot wedges are arranged at the slot opening part of the parallel teeth.

[0044] The single-pitch forming hard winding is y=1, and the single-pitch forming hard winding is formed by flat winding of group of enameled flat copper wires to form double-row flat wire single coil, and two groups of double-row coils are connected in reverse series.

[0045] Example 3

[0046] In the application, the forming hard winding is y=1 single-pitch winding, and double-row flat wire single coils are formed by flat winding of group of enameled flat copper wires, and the winding method is as follows:

[0047] (1) first, a 45° displacement bend with a height equal to the width of the flat copper wire is molded in the thickness direction in the middle of the length of the whole flat copper wire;

[0048] (2) then, starting from the 45° displacement bend, the double-row flat wire single coils are wound in the width direction on the mold according to the upper and lower double-row flat wires in positive and reverse directions respectively, and the coil lead wires are located on the outside of the double-row flat wire single coils;

[0049] (3) then, the two groups of double-row coils wound according to the above method are reversely combined and firmly brazed at the end, so as to be connected in series to form a single forming hard winding with more turns.

[0050] The embedding structure of the single-pitch forming hard winding is as follows: each single-pitch forming hard winding is sleeved on a parallel tooth of the stator core, the two straight edges of the winding are located in the same layer in the adjacent slots on both sides of the parallel tooth, the slot insulation paper for isolation and insulation is arranged in the embedding slot, the two straight edges of the forming hard winding are arranged in a left-right arrangement structure in each embedding slot, so that the single-pitch forming hard winding with a pitch y=1 is arranged in a left-right arrangement structure in the same layer in the slot, the end is supported and tightened in the axial direction by the arc insulation support block, and the binding rope is crossed and firmly bound with the end of the winding through the hole of the arc insulation support block, and the rectangular slot wedge is embedded in the groove in the slot opening part of the parallel tooth to fasten the two straight edges.

[0051] Example 4

[0052] In the application, the forming hard winding is y=1 single-pitch winding, and double-row flat wire single coils are formed by flat winding of group of enameled flat copper wires, and the winding method is as follows:

[0053] (1) first, a 45° displacement bend with a height equal to the width of the flat copper wire is molded in the thickness direction in the middle of the length of the whole flat copper wire;

[0054] (2) then, starting from the 45° displacement bend, the double-row flat wire single coils are wound in the width direction on the mold according to the upper and lower double-row flat wires in positive and reverse directions respectively, and the coil lead wires are located on the outside of the double-row flat wire single coils;

[0055] (3) again the two groups of double-row coils wound flat by the above method are combined into a single shaped hard winding in parallel, the outgoing wires of the combined shaped hard winding are also located on the outer side for facilitating the end shaping and wiring.

[0056] The above implementation / test examples are merely examples for clearly illustrating, but not limitation on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A single-pitch shaped hard-wound embedding structure, comprising a casing, a stator core, a single-pitch shaped hard winding, a circular arc insulation support block and a slot wedge, the casing is arranged outside the circular surface of the stator core, characterized in that: The inner circular surface of the stator core is annularly provided with Z parallel teeth and completely open embedded wire slots which are evenly distributed and even in number, and each parallel tooth is sleeved with a single pitch forming hard winding of y=1; each embedded wire slot is provided with two single pitch forming hard winding linear edges arranged in left and right structures, and the end part is provided with a circular arc insulation support block to axially support the single pitch forming hard winding; the inner circular diameter of the stator core is radially inserted into the groove in the parallel tooth slot opening part to fasten the linear edges of the two windings; The forming hard winding is a single pitch winding of y=1, and the single pitch forming hard winding is a double-row flat wire single coil formed by grouping and flat winding of enameled flat copper wires; the inner circle of the single coil is pressed with a 45° transposition bend to form a copper wire outer lead structure facilitating end forming connection; the single pitch forming hard winding is formed by series or parallel connection of two groups of double-row coils; the embedded structure is further provided with in-slot insulation between the linear edges of the two single pitch forming hard windings; The stator core has a thickness of 0.5 mm and is formed by stacking whole sections of fan-shaped silicon steel punched sheets according to the designed axial length, to form a whole stator core composed of Z parallel teeth, an equal number of completely open embedded wire slots, and a core yoke connected to the tooth part.

2. A single-pitch formed hard-wound embedding structure according to claim 1, characterized in that: The groove is a rectangular groove located at the slot opening part of the parallel tooth.

3. A single-pitch form-wound hard- wound insertion transposition winding method according to claim 1, characterized in that: The method comprises the following steps: (1) First, a 45° transposition bend with a height equal to the width of the flat copper wire is molded in the middle of the whole flat copper wire length along the thickness direction; (2) Then, a double-row flat wire single coil is flat wound on the mold according to the above steps, and the coil lead wires are located on the outer side of the double-row flat wire single coil; (3) Then, two groups of double-row coils flat wound according to the above method are combined in reverse and firmly copper-brazed at the end part, so as to be series-connected into a single forming hard winding with more turns, i.e.

4. A single-pitch form-wound hard- wound insertion transposition winding method according to claim 3, characterized in that: In step (3), two groups of double-row coils are combined into a single forming hard winding in parallel, and the lead wires of the combined forming hard winding are also located on the outer side facilitating end forming connection.

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