Stator winding and motor

Abstract

The embodiment of the invention discloses a stator winding and a motor. The stator winding comprises a plurality of winding branches, wherein each winding branch comprises a wire inlet end and a wire outlet end; wherein the number of winding layers of the winding branches is multiple, the winding branches conduct winding in the stator grooves, the winding mode of the winding branches is a continuous wave winding mode, and the stator grooves at the wire inlet end and the wire outlet end of each winding branch are different stator grooves. According to the stator winding and the motor provided by the embodiment of the invention, the problem of imbalance of inter-phase current can be solved, and the output efficiency is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to motor design technology, and in particular to a stator winding and a motor. Background Art

[0002] As an electromagnetic device for converting or transmitting electric energy, motors are widely used in many fields of production and life. Among them, the stator winding is an important part of the motor.

[0003] At present, the existing stator winding usually adopts a multi-strand overlapping winding method with a small wire diameter, which has the problem of unbalanced current between phases and affects the output efficiency. Summary of the invention

[0004] The embodiments of the present invention provide a stator winding and a motor to solve the problem of unbalanced current between phases and improve output efficiency.

[0005] In a first aspect, an embodiment of the present invention provides a stator winding, comprising: a plurality of winding branches, each of the winding branches comprising an input end and an output end; wherein the winding branches have multiple winding layers, the winding branches are wound inside stator slots, the winding method of the winding branches is a continuous wave winding method, and the stator slots at the input end and the output end of the winding branches are different stator slots.

[0006] Optionally, there are multiple stator slots, each of which has multiple layers of windings, the number of winding layers inside each stator slot is the same, the same layer of windings in adjacent stator slots are windings of different winding branches, and the winding method is a cross-layer and reverse continuous wave winding method.

[0007] Optionally, the winding branches are connected in parallel, and the winding branches are parallel branches; or, the winding branches are connected in series in pairs, and the number of the winding branches is twice the number of the parallel branches.

[0008] Optionally, the winding method is a continuous wave winding method that alternates between full pitch y and y±1 and y±3.

[0009] Optionally, the number of winding layers of the winding branch is 4N, where N is 1 or 2 or 3.

[0010] Optionally, the number of slots per pole and per phase of the stator winding is 3.

[0011] Optionally, the number of the winding branches is 4 or 8.

[0012] Optionally, the number of the winding branches is the same as or different from the number of the winding layers.

[0013] Optionally, the stator winding is a round wire stator winding.

[0014] In a second aspect, an embodiment of the present invention provides a motor, comprising a stator winding as described in the first aspect.

[0015] The stator winding and motor provided by the embodiment of the present invention, the stator winding includes: a plurality of winding branches, each winding branch includes an input end and an output end; wherein the winding branches have multiple winding layers, the winding branches are wound inside the stator slots, the winding method of the winding branches is a continuous wave winding method, and the stator slots at the input end and the output end of the winding branches are different stator slots. The stator winding and motor provided by the embodiment of the present invention, through the winding method of continuous wave winding of the winding branches, realize continuous wave winding in a variable pitch, cross-layer, and reverse manner, thereby solving the problem of unbalanced current between phases, and can realize multi-way parallel connection through the connection of the winding branches, reduce current density, expand the power range, and improve output efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a stator winding provided by an embodiment of the present invention;

[0017] Figure 2 is a structural schematic diagram of a winding branch provided by an embodiment of the present invention;

[0018] Figure 3 is a structural schematic diagram of a stator slot and the number of winding layers provided by an embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of the structure of a parallel branch provided by an embodiment of the present invention;

[0020] Figure 5 is a structural schematic diagram of a winding branch connection provided by an embodiment of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of another parallel branch provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0023] Figure 1 is a schematic diagram of the structure of a stator winding provided by an embodiment of the present invention, Figure 2 is a schematic diagram of the structure of a winding branch provided by an embodiment of the present invention, Figure 3 Schematic diagram of the structure of stator slots and winding layers provided by an embodiment of the present invention. Figure 1 , Figure 2 and Figure 3 The stator winding includes: a plurality of winding branches, each winding branch includes an input end and an output end; wherein the winding branches have multiple winding layers, the winding branches are wound inside the stator slots, the winding method of the winding branches is a continuous wave winding method, and the stator slots at the input end and the output end of the winding branches are different stator slots.

[0024] Exemplarily, the stator winding is a UVW three-phase stator winding, and each phase includes a plurality of winding branches. Figure 1 The figure shows eight winding branches, eight winding layers and 96 stator slots of the U phase. Figure 1 Taking the eight winding branches, eight winding layers and 96 stator slots of the U phase shown in the figure as an example, the eight winding layers include the first layer, the second layer, the third layer, the fourth layer, the fifth layer, the sixth layer, the seventh layer and the eighth layer. Figure 1 The different numbers 1-8 in each layer from the first layer to the eighth layer respectively represent the first winding branch, the second winding branch, the third winding branch, the fourth winding branch, the fifth winding branch, the sixth winding branch, the seventh winding branch, and the eighth winding branch. Figure 1 The numbers 1-96 in the middle gray position are the slot numbers of the 96 stator slots, representing the first stator slot, the second stator slot...the ninth six stator slots respectively. Figure 1 It is shown in the figure that the incoming end of the first winding branch is located at the 21st stator slot of the first layer, and the outgoing end of the first winding branch is located at the 34th stator slot of the seventh layer; the incoming end of the second winding branch is located at the 21st stator slot of the second layer, and the outgoing end of the second winding branch is located at the 34th stator slot of the eighth layer; the incoming end of the third winding branch is located at the 22nd stator slot of the first layer, and the outgoing end of the third winding branch is located at the 33rd stator slot of the seventh layer; the incoming end of the fourth winding branch is located at the 22nd stator slot of the second layer, and the outgoing end of the fourth winding branch is located at the 33rd stator slot of the eighth layer. The incoming end of the fifth winding branch is located at the twenty-third stator slot of the first layer, and the outgoing end of the fifth winding branch is located at the thirty-sixth stator slot of the seventh layer; the incoming end of the sixth winding branch is located at the twenty-third stator slot of the second layer, and the outgoing end of the sixth winding branch is located at the thirty-sixth stator slot of the eighth layer; the incoming end of the seventh winding branch is located at the twenty-fourth stator slot of the first layer, and the outgoing end of the seventh winding branch is located at the thirty-fifth stator slot of the seventh layer; the incoming end of the eighth winding branch is located at the twenty-fourth stator slot of the second layer, and the outgoing end of the eighth winding branch is located at the thirty-fifth stator slot of the eighth layer.

[0025] Further, Figure 2The winding method of the first winding branch is shown in the figure. The distribution of each winding branch in the eight layers can be seen as the first four layers and the last four layers. The winding methods of these two parts are exactly the same. The last four layers can be seen as a repetition of the first four layers. The winding of the first four layers enters from the inlet end and is wound in an alternating manner of full pitch y, y±1, and y±3. Among them, pitch 12 appears 8 times, pitch y±1 appears 3 times each, and pitch y±3 appears 1 time each. The overall average pitch y is 12. The winding has variable pitch, frequent layer crossing, and reverse direction. The reverse area is located between the ninth slot and the thirty-sixth slot. Specifically, the position of the incoming end of the first winding branch is the twenty-first slot of the first layer, and then it is wound from the twenty-first slot of the first layer to the thirty-third slot of the second layer, and then from the thirty-third slot of the second layer to the forty-eighth slot of the second layer, and then from the forty-eighth slot of the second layer to the sixtieth slot of the first layer, from the sixtieth slot of the first layer to the seventy-first slot of the first layer, from the seventy-first slot of the first layer to the eighty-third slot of the second layer, and then from the eighty-third slot of the second layer to the ninety-fourth slot of the second layer, and then from the ninety-fourth slot of the second layer in the direction of the ninety-sixth slot to the tenth slot of the first layer, from the tenth slot of the first layer to the twenty-first slot of the third layer, from the twenty-first slot of the third layer to the ninth slot of the fourth layer, from the ninth slot of the fourth layer in the direction of the first slot to the ninety-sixth slot of the fourth layer, from the ninety-sixth slot of the fourth layer to the eighty-fourth slot of the third layer, from the eighty-fourth slot of the third layer to the seventy-first slot of the third layer, from the seventy-first slot of the third layer to the fifty-ninth slot of the fourth layer, from the fifty-ninth slot of the fourth layer to the forty-sixth slot of the fourth layer, from the forty-sixth slot of the fourth layer to the thirty-fourth slot of the third layer, The thirty-fourth slot of the third layer is wound around to the twenty-first slot of the fifth layer, from the twenty-first slot of the fifth layer to the thirty-third slot of the sixth layer, from the thirty-third slot of the sixth layer to the forty-eighth slot of the sixth layer, from the forty-eighth slot of the sixth layer to the sixtieth slot of the fifth layer, from the sixtieth slot of the fifth layer to the seventy-first slot of the fifth layer, from the seventy-first slot of the fifth layer to the eighty-third slot of the sixth layer, from the eighty-third slot of the sixth layer to the ninety-fourth slot of the sixth layer, from the ninety-fourth slot of the sixth layer to the direction of the ninety-sixth slot to the tenth slot of the fifth layer, from the tenth slot of the fifth layer to the twenty-first slot of the seventh layer, from the twenty-first slot of the seventh layer to the ninth slot of the eighth layer, from the ninth slot of the eighth layer to the direction of the first slot to the ninety-sixth slot of the eighth layer, from the ninety-sixth slot of the eighth layer to the eighty-fourth slot of the seventh layer, from the eighty-fourth slot of the seventh layer to the seventy-first slot of the seventh layer, from the seventy-first slot of the seventh layer to the fifty-ninth slot of the eighth layer, from the fifty-ninth slot of the eighth layer to the forty-sixth slot of the eighth layer, from the forty-sixth slot of the eighth layer to the thirty-fourth slot of the seventh layer, to complete the winding of the first winding branch, thereby forming a winding structure as shown in FIG. Figure 2 The continuous wave winding method shown in the figure. In addition, an S-shaped wave winding is formed between the incoming and outgoing ends of the winding branch. The winding of other branches can refer to Figure 1 and Figure 2 Combined with the above description of the winding process of the first winding branch, it will not be repeated here. Figure 3The numbers in the middle are the slot numbers of the stator slots. Figure 3 After zooming in on the stator slot in the figure, it can be seen that the eight layers of windings from the inside to the outside of the stator slot are the first layer a, the second layer b, the third layer c, the fourth layer d, the fifth layer e, the sixth layer f, the seventh layer g, and the eighth layer h.

[0026] It should be noted that Figure 1 , Figure 2 and Figure 3 The specific number of winding branches and winding layers and the specific positions of each input terminal and output terminal are only for schematic illustration and can be determined according to the actual motor design requirements and are not limited here.

[0027] The stator winding provided in this embodiment includes: a plurality of winding branches, each winding branch includes an inlet end and an outlet end; wherein the winding branches have multiple winding layers, the winding branches are wound inside the stator slots, the winding method of the winding branches is a continuous wave winding method, and the stator slots at the inlet end and the outlet end of the winding branches are different stator slots. The stator winding provided in this embodiment realizes continuous wave winding in a variable pitch, cross-layer, and reverse manner through the continuous wave winding method of the winding branches, thereby solving the problem of unbalanced current between phases, and can realize multi-path parallel connection through the connection of the winding branches, reduce current density, expand the power range, and improve output efficiency.

[0028] refer to Figure 1 , Figure 2 and Figure 3 Optionally, there are multiple stator slots, each stator slot has multiple layers of windings, the number of winding layers inside each stator slot is the same, the same layer of windings in adjacent stator slots are windings of different winding branches, and the winding method is a cross-layer and reverse continuous wave winding method.

[0029] Exemplarily, the number of winding layers includes a first layer, a second layer, a third layer, a fourth layer, a fifth layer, a sixth layer, a seventh layer, and an eighth layer, a total of eight layers, and the winding branches include a first winding branch, a second winding branch, a third winding branch, a fourth winding branch, a fifth winding branch, a sixth winding branch, a seventh winding branch, and an eighth winding branch, a total of eight branches, such as Figure 1 As shown in FIG. 1 , the winding of the 21st stator slot of the first layer is the winding of the first winding branch, and the winding of the 22nd stator slot of the first layer is the winding of the third winding branch. Define the direction from the first stator slot to the second stator slot as the positive direction, and the direction from the second stator slot to the first stator slot as the negative direction, as shown in FIG. Figure 2As shown, the first winding branch has multiple reverse and cross-layer occurrences during the winding process, and the number of layers crossed is 1. For example, when the first winding branch is wound from the 48th slot of the second layer to the 60th slot of the first layer, it crosses from the second layer to the first layer, and when the first winding branch is wound from the 94th slot of the second layer to the 10th slot of the first layer, it reverses from the 94th slot to the 10th slot, and reverses and crosses layers at the same time. In the above description of the winding process of the first winding branch, the winding from the slot with a smaller number to the slot with a larger number is in the forward direction, and the winding from the slot with a larger number to the slot with a smaller number is in the reverse direction.

[0030] Figure 4 is a schematic diagram of a parallel branch structure provided by an embodiment of the present invention, Figure 5 is a schematic diagram of a structure of a winding branch connection provided by an embodiment of the present invention, Figure 6 FIG. 1 is a schematic diagram of another structure of a parallel branch provided by an embodiment of the present invention. Figure 4 , Figure 5 and Figure 6 Optionally, each winding branch is connected in parallel, and the winding branches are parallel branches; or, the winding branches are connected in series in pairs, and the number of winding branches is twice the number of parallel branches.

[0031] For example, there are 8 winding branches, such as Figure 4 As shown, 8 winding branches are connected in parallel to form 8 parallel branches. Alternatively, 8 winding branches are connected in series to form 4 parallel branches. If the inlet and outlet wires of the eight winding branches are welded, 4 parallel branches can be formed. Figure 5 As shown, the specific operation is that the outlet end g34 (g34 represents the 34th slot of the seventh layer) of the first winding branch and the inlet end b21 (b21 represents the 21st slot of the second layer) of the second winding branch are welded, that is, the first winding branch and the second winding branch are connected in series to form a new parallel branch, the inlet end of the new parallel branch is the inlet end of the first winding branch, and the outlet end is the outlet end of the second winding branch, the third winding branch and the fourth winding branch, the fifth winding branch and the sixth winding branch, the seventh winding branch and the eighth winding branch can respectively form the remaining three parallel branches, as shown in FIG. Figure 6 As shown, eight winding branches are connected in series in pairs to form four parallel branches. Figure 4 The figure shows the star connection of eight parallel three-phase windings. Figure 6 The diagram shows the star connection of four parallel three-phase windings. The V-phase and W-phase increase in slot number with the U-phase, and are staggered by 120 electrical degrees and 240 electrical degrees counterclockwise, respectively. The array replicates the winding of the U-phase to obtain symmetrical V-phase and W windings.

[0032] Optionally, the winding method is a continuous wave winding method that alternates between full pitch y and y±1 and y±3.

[0033] Specifically, refer to Figure 1 and Figure 2 , the full pitch y is 12, the position of the incoming end of the first winding branch is the 21st slot, and then it is wound from the 21st slot to the 33rd slot, passing the full pitch y, and then from the 33rd slot to the 48th slot, passing the full pitch y+3, and then from the 48th slot to the 60th slot, passing the full pitch y, from the 60th slot to the 71st slot, passing the full pitch y-1, with a continuous wave winding method that alternates between the full pitch y and y±1, y±3 to prevent the generation of circulating current.

[0034] Optionally, the number of winding layers of the winding branch is 4N, where N is 1 or 2 or 3.

[0035] Exemplarily, N is 2 and the number of winding layers is 8, so as to prevent the problem of too small or too large current caused by too many or too few winding layers.

[0036] Optionally, the number of slots per pole and per phase of the stator winding is 3.

[0037] Exemplarily, the stator winding has a structure of 6 poles and 54 slots, 8 poles and 96 slots, or 12 poles and 108 slots, preferably 8 poles and 96 slots.

[0038] Optionally, the number of winding branches is 4 or 8.

[0039] Exemplarily, the number of winding branches is 8, so as to prevent the problem of too small or too large current caused by too many or too few winding branches.

[0040] Optionally, the number of winding branches is the same as or different from the number of winding layers.

[0041] The number of winding branches and the number of winding layers may be the same or different, and may be determined based on actual motor design requirements, which will not be elaborated here.

[0042] Optionally, the stator winding is a round wire stator winding.

[0043] Specifically, round wire stator windings are used to achieve uninterrupted continuous wave winding. Not only do they not require solder joints and have lower winding ends, but they also use large diameter round wires, which have the advantage of a high slot fill rate of flat wires. They have higher efficiency and output capacity than traditional small diameter round wire motors, and have better design flexibility, and have lower industrialization requirements than flat wires.

[0044] in addition, Figure 1The 25th stator slot of the first layer is the incoming wire end of the first winding branch of the W phase, the 26th stator slot of the first layer is the incoming wire end of the third winding branch of the W phase, the 27th stator slot of the first layer is the incoming wire end of the fifth winding branch of the W phase, and the 28th stator slot of the first layer is the incoming wire end of the seventh winding branch of the W phase; the 25th stator slot of the second layer is the incoming wire end of the second winding branch of the W phase, the 26th stator slot of the second layer is the incoming wire end of the fourth winding branch of the W phase, the 27th stator slot of the second layer is the incoming wire end of the sixth winding branch of the W phase, and the 28th stator slot of the second layer is the incoming wire end of the eighth winding branch of the W phase. The twenty-ninth stator slot of the first layer is the incoming wire end of the first winding branch of the V phase, the thirtieth stator slot of the first layer is the incoming wire end of the third winding branch of the V phase, the thirty-first stator slot of the first layer is the incoming wire end of the fifth winding branch of the V phase, and the thirty-second stator slot of the first layer is the incoming wire end of the seventh winding branch of the V phase; the twenty-ninth stator slot of the second layer is the incoming wire end of the second winding branch of the V phase, the thirtieth stator slot of the second layer is the incoming wire end of the fourth winding branch of the V phase, the thirty-first stator slot of the second layer is the incoming wire end of the sixth winding branch of the V phase, and the thirty-second stator slot of the second layer is the incoming wire end of the eighth winding branch of the V phase. The thirty-seventh stator slot of the seventh layer is the outlet end of the third winding branch of the W phase, the thirty-eighth stator slot of the seventh layer is the outlet end of the first winding branch of the W phase, the thirty-ninth stator slot of the seventh layer is the outlet end of the seventh winding branch of the W phase, and the fortieth stator slot of the seventh layer is the outlet end of the fifth winding branch of the W phase; the thirty-seventh stator slot of the eighth layer is the outlet end of the fourth winding branch of the W phase, the thirty-seventh stator slot of the eighth layer is the outlet end of the second winding branch of the W phase, the thirty-seventh stator slot of the eighth layer is the outlet end of the eighth winding branch of the W phase, and the thirty-seventh stator slot of the eighth layer is the outlet end of the sixth winding branch of the W phase. The 41st stator slot of the seventh layer is the outlet of the third winding branch of the V phase, the 42nd stator slot of the seventh layer is the outlet of the first winding branch of the V phase, the 43rd stator slot of the seventh layer is the outlet of the seventh winding branch of the V phase, and the 44th stator slot of the seventh layer is the outlet of the fifth winding branch of the V phase; the 41st stator slot of the eighth layer is the outlet of the fourth winding branch of the V phase, the 42nd stator slot of the eighth layer is the outlet of the second winding branch of the V phase, the 43rd stator slot of the eighth layer is the outlet of the eighth winding branch of the V phase, and the 44th stator slot of the eighth layer is the outlet of the sixth winding branch of the V phase. The winding method of the V phase and the W phase is the same Figure 1 and Figure 2 The winding method of the U phase shown is the same, starting from the incoming line end. For specific winding methods, please refer to Figure 1 and Figure 2 , I will not go into details here.

[0045] It should be noted that the size of each parameter in this embodiment can be determined according to actual motor design requirements and is not limited here.

[0046] The stator winding provided in this embodiment includes: multiple winding branches, each winding branch includes an input end and an output end; wherein the winding branches have multiple winding layers, the winding branches are wound inside the stator slots, the winding method of the winding branches is a continuous wave winding method, and the stator slots of the input end and the output end of the winding branches are different stator slots; each winding branch is connected in parallel, and the winding branches are parallel branches; or, the winding branches are connected in series in pairs, and the number of winding branches is twice the number of parallel branches. The stator winding provided in this embodiment realizes continuous wave winding in a variable pitch, cross-layer, and reverse manner through the winding branch continuous wave winding method, thereby solving the problem of unbalanced current between phases, and realizes multi-way parallel connection through the connection of winding branches, reduces current density, expands power range, and improves output efficiency.

[0047] This embodiment further provides a motor, comprising the stator winding as described in any embodiment of the present invention, wherein the motor may be a permanent magnet synchronous three-phase motor.

[0048] The following are the explanations of the terms used in motors: The number of rotor poles is the sum of the N poles and S poles generated by the rotor; the number of stator slots is the number of cavities dug inside the stator to fill the effective sides of the winding; the pitch refers to the number of slots spanned between the two effective sides of a coil (the part that enters the stator slot); the pole pitch is the number of stator slots Z of the motor divided by the number of motor poles p; when the pitch is equal to the pole pitch, it is called the full pitch, also known as the full pitch. Winding end: The part of the coil that is exposed to the core at both ends of the axial direction, except for the part that enters the stator core slot, is called the winding end. The number of slots per pole per phase q is equal to the number of slots Z divided by the number of phases m and the number of poles p (q = Z / mp).

[0049] The motor provided in this embodiment and the stator winding provided in any embodiment of the present invention belong to the same inventive concept and have corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the stator winding provided in any embodiment of the present invention.

[0050] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A stator winding, characterized in that: include: Multiple winding branches, each of the winding branches includes an input end and an output end; wherein the winding branches have multiple winding layers, the winding branches are wound inside the stator slots, the winding method of the winding branches is a continuous wave winding method, and the stator slots of the input end and the output end of the winding branch are different stator slots.

2. The stator winding according to claim 1, characterized in that: There are multiple stator slots, each of which has multiple layers of windings. The number of winding layers inside each stator slot is the same, and the same-layer windings of adjacent stator slots are windings of different winding branches. The winding method is a cross-layer and reverse continuous wave winding method.

3. The stator winding according to claim 1, characterized in that: The winding branches are connected in parallel, and the winding branches are parallel branches; or, the winding branches are connected in series in pairs, and the number of the winding branches is twice the number of the parallel branches.

4. The stator winding according to claim 1, characterized in that: The winding method is a continuous wave winding method with alternating full pitch y and y±1, y±3.

5. The stator winding according to claim 1, characterized in that: The number of winding layers of the winding branch is 4N, where N is 1 or 2 or 3.

6. The stator winding according to claim 1, characterized in that: The number of slots per pole and per phase of the stator winding is 3.

7. The stator winding according to claim 1, characterized in that: The number of the winding branches is 4 or 8.

8. The stator winding according to claim 1, characterized in that: The number of the winding branches is the same as or different from the number of the winding layers.

9. The stator winding according to claim 1, characterized in that: The stator winding is a round wire stator winding.

10. A motor, characterized in that: Comprising the stator winding as described in any one of claims 1-9.

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