A doubly-fed electric machine rotor structure

Abstract

The utility model relates to motor technical field, especially a doubly -fed motor rotor structure, including rotor and multiple series branch, the outer periphery of rotor has a plurality of coil slots according to preset slot number, and the slot number of a plurality of coil slots is marked along clockwise direction or counterclockwise direction according to order, parallel connection is connected between multiple series branch, and series branch is formed by at least one first branch and at least one second branch series connection, the coil of first branch and second branch is all successively according to order slot number and is wound in coil slot, and first branch and second branch are wound in the inner layer and the outer layer of coil slot respectively, or first branch and second branch are wound in the outer layer and the inner layer of coil slot respectively, in first branch and second branch, the welding spot of each coil is respectively welded in the upper side and the lower side of rotor, solved the problem that the series connection between the coil of traditional rotor structure needs to cross and span layer by layer, leads to too many welding points and distribution disorder, cannot pass through machine automation welding, and the production efficiency is low.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor structure for a doubly fed motor. Background Technology

[0002] Currently, the rotor windings of doubly-fed motors have multi-phase windings arranged in the rotor slots. In principle, they can be formed by connecting two sets of multi-phase windings with pole pairs P1 and P2 in series. Each set of windings includes multiple branches, and each branch includes multiple coils. The coils need to cross multiple slots according to the pitch before being wound back and connected in series with the coils of the same branch to form a branch (for a detailed explanation of the principle, see Chinese patent application number: 202510208199.5, patent name: a rotor winding of a wound-rotor brushless doubly-fed motor). This results in the coil windings of the entire rotor structure of the doubly-fed motor being layered. After manually winding a coil, the tail end of the coil is then welded in series with the head end of the next coil, which further leads to too many welding points and a messy distribution. Manual welding is troublesome and cannot be automated by machine, resulting in low production efficiency. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to propose a doubly fed motor rotor structure that solves the problem that the series connection between coils in the traditional rotor structure requires multiple staggered crossings, resulting in too many welding points with a disordered distribution, making automated welding impossible and leading to low production efficiency.

[0004] To achieve this objective, the present invention adopts the following technical solution: A doubly fed motor rotor structure includes a rotor and multiple series branches; the outer circumference of the rotor is provided with multiple coil slots according to a preset number of slots, and the slot numbers of the multiple coil slots are marked sequentially in a clockwise or counterclockwise direction; The multiple series branches are connected in parallel, and the series branches are formed by connecting at least one first branch and at least one second branch in series; The coils of the first branch and the second branch are wound sequentially in the coil slots according to the slot numbers; the first branch and the second branch are wound in the inner and outer layers of the coil slots, respectively, or the first branch and the second branch are wound in the outer and inner layers of the coil slots, respectively. In the first branch and the second branch, the solder joints of each coil are soldered to the top and bottom of the rotor, respectively.

[0005] Furthermore, in the first branch and the second branch, each coil is composed of an independent incoming line and an independent return line connected in series, and the incoming line and the return line are respectively housed in two coil slots separated by pitch; In the same coil, the beginning of the incoming line is welded to the end of the return line of the previous coil above the rotor to form the solder joint; the end of the incoming line is welded to the beginning of the return line below the rotor to form the solder joint; the end of the return line is welded to the beginning of the incoming line of the next coil above the rotor to form the solder joint.

[0006] Furthermore, the beginning and end of all the series branches are wound above or below the rotor, and the beginning and end of all the series branches are welded to the first conductive element.

[0007] Furthermore, the first conductive element is a ring arranged along the circumference of the rotor, and the start and end ends of the series connections of all the series branches extend longitudinally and are welded to the first conductive element.

[0008] Furthermore, the solder joint of the first branch is located between the solder joints of two adjacent second branches.

[0009] Furthermore, within the same series branch, the first branch and the second branch are connected in series end to end across the inner and outer layers of the coil slot via a second conductive element.

[0010] Furthermore, the second conductive element is a horizontal piece parallel to the top surface of the rotor, and the two ends of the second conductive element are welded to the first branch and the second branch, respectively.

[0011] Furthermore, within the same coil, the tail end of the incoming wire and the head end of the return wire are integrally formed.

[0012] The technical solution provided by this utility model can include the following beneficial effects: First, the coils wound on each first branch and each second branch of the rotor are limited to be arranged in sequence. The rotor winding schematic diagram is shown in the figure as an example. The marked slot number only indicates the slot number of the coil inlet line of a single coil. The return line can be converted according to the pitch.

[0013] Based on the sequential arrangement of coils in each branch, the first and second branches in the series circuit are wound on the outer and inner layers of the coil slot, respectively. That is, in the same coil slot, the coil of the first branch is placed inside the coil slot (i.e., the inner layer of the coil slot), while the coil of the second branch is placed on the opposite outer side of the coil slot (i.e., the outer side of the coil of the first branch, the outer layer inside the coil slot). This forms a coil slot reuse. At the same time, the solder points of each coil are soldered to the top and bottom of the rotor, respectively. This results in neat rows of solder ends on the top and bottom of the rotor. Using automated machine welding, the ends can be quickly soldered to form solder points, so that all coils in the same series circuit are soldered in series, as shown in the figure (the four different colored coil series circuits in the figure represent the four series circuits in the figure). It can be seen that the rotor structure formed in this way has neat coil lead arrangement, reducing manual wire handling work. The solder points are neatly arranged, and the machine can replace manual welding for fast welding, which greatly improves production efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a doubly fed motor rotor structure according to Embodiment 1 of this utility model.

[0015] Figure 2 Is it like this? Figure 1 The diagram shows the series branch markings for a doubly fed motor rotor structure.

[0016] Figure 3 Is it like this? Figure 1 The diagram shows the rotor winding principle of a doubly fed motor rotor structure.

[0017] Figure 4 Is it like this? Figure 1 The diagram shows the structure of the series branch.

[0018] Figure 5 This is a partial structural schematic diagram of a doubly fed motor rotor structure according to Embodiment 2 of this utility model.

[0019] Among them: rotor 1, series branch 2, weld point 3, first branch 21, second branch 22, incoming line 211, return line 212, first conductive element 4, series start end 23, series end 24, second conductive element 5. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0024] The following is combined Figures 1 to 5 This describes a doubly fed motor rotor structure according to an embodiment of the present invention.

[0025] Example 1 A doubly fed motor rotor structure includes a rotor 1 and multiple series branches 2; the outer periphery of the rotor 1 is provided with multiple coil slots according to a preset number of slots, and the slot numbers of the multiple coil slots are marked in sequence along the clockwise or counterclockwise direction; Multiple series branches 2 are connected in parallel, and each series branch 2 is formed by connecting at least one first branch 21 and at least one second branch 22 in series. The coils of the first branch 21 and the second branch 22 are wound sequentially in the coil slots according to the slot numbers; the first branch 21 and the second branch 22 are wound in the inner and outer layers of the coil slots respectively, or the first branch 21 and the second branch 22 are wound in the outer and inner layers of the coil slots respectively. In the first branch 21 and the second branch 22, the solder point 3 of each coil is soldered to the top and bottom of the rotor 1, respectively.

[0026] In a preferred embodiment of the doubly-fed motor rotor structure proposed in this utility model, the coils wound in each of the first branches 21 and each of the second branches 22 of the rotor are first defined as arranged in sequence, and the rotor winding schematic diagram is as follows: Figure 3 For example, the marked slot number only indicates the slot number of the coil that a single coil input line can accommodate; the return line can be converted according to the pitch.

[0027] Based on the sequential arrangement of the coils in each branch, the first branch 21 and the second branch 22 in the series branch 2 are wound on the outer and inner layers of the coil slot, respectively. That is, in the same coil slot, the coil of the first branch 21 is first placed inside the coil slot (i.e., the inner layer of the coil slot), while the coil of the second branch 22 is placed on the opposite outer side of the coil slot (i.e., the outer side of the coil of the first branch 21, the outer layer inside the coil slot). This forms a coil slot reuse. At the same time, the solder points 3 of each coil are soldered to the top and bottom of the rotor 1, respectively. This results in neatly arranged rows of ends to be soldered on the top and bottom of the rotor 1. Using automated welding, the ends can be quickly soldered to form solder points 3, so that all the coils in the same series branch 2 are soldered in series. Figure 1 and 2 As shown ( Figure 2 The four different colored coils connected in series represent Figure 3 The four series branches 2) show that the rotor structure formed by this is neatly arranged with coil leads, reducing manual wire management. The solder joints are also neatly arranged, allowing machines to replace manual welding for rapid welding, which greatly improves production efficiency.

[0028] Furthermore, in the first branch 21 and the second branch 22, each coil is composed of an independent incoming line 211 and an independent return line 212 connected in series, with the incoming line 211 and the return line 212 respectively housed in two coil slots separated by pitch. In the same coil, the beginning of the input wire 211 is welded to the end of the return wire 212 of the previous coil above the rotor 1 to form a solder point 3; the end of the input wire 211 is welded to the beginning of the return wire 212 below the rotor 1 to form a solder point 3; the end of the return wire 212 is welded to the beginning of the input wire 211 of the next coil above the rotor 1 to form a solder point 3.

[0029] In this embodiment, as Figure 1 and Figure 4 As shown, the coil is preferably split according to the inlet wire 211 and return wire 212, which are housed in different coil slots, to facilitate assembly. The machine can directly place the inlet wire 211 and return wire 212 into the coil slots according to the slot number. Then, the machine welds the first and last ends of the inlet wire 211 and return wire 212 together above and below the rotor 1 in one go, which completes the series connection inside the series branch 2 (because they are neatly arranged), greatly improving production efficiency.

[0030] It should be noted that the solder joint 3 above the rotor 1 is formed by welding the beginning of the input line 211 to the end of the return line 212 of the previous coil above the rotor 1, or by welding the end of the return line 212 to the beginning of the input line 211 of the next coil above the rotor 1; the solder joint 3 below the rotor 1 is formed by welding the end of the input line 211 to the beginning of the return line 212 below the rotor 1.

[0031] Furthermore, the beginning and end of all series branches 2 are wound above or below the rotor 1, and the beginning and end of all series branches 2 are welded to the first conductive element 4.

[0032] In this embodiment, after the series branch 2 is connected in series to form a loop, as follows: Figure 1 and 4 As shown, there must be a beginning and a end for parallel connection with other series branches 2; therefore, it is preferable to wind the beginning and end of all series branches 2 above or below the rotor 1, so that they can be connected to the first conductive element 4 to complete the parallel connection, reduce the bridging distance of the first conductive element 4, reduce the impedance, and avoid adverse factors such as overheating and voltage attenuation; at the same time, it can also avoid the difficulty of welding positioning caused by the dispersed distribution of the beginning and end, reduce the welding operation steps, and further adapt to automated welding equipment.

[0033] Furthermore, the first conductive element 4 is a ring arranged along the circumference of the rotor 1, and the series start end 23 and series end end 24 of all series branches 2 extend longitudinally and are welded to the first conductive element 4.

[0034] In this embodiment, after the first end 23 and the last end 24 of the series circuit 2 are wound above or below the rotor 1, the first conductive element 4 is preferably a ring arranged along the circumference of the rotor 1, which can reduce the outer extension distance of the first end 23 and the last end 24 of the series circuit. It only needs to extend longitudinally for a short distance to contact and weld with the first conductive element 4.

[0035] Furthermore, the solder joint 3 of the first branch 21 is located between the solder joints 3 of the two adjacent second branches 22.

[0036] In this embodiment, the solder joint 3 of the first branch 21 is located between the solder joints 3 of two adjacent second branches 22. The distribution of the solder joints of the first branch 21 and the second branch 22 can be reasonably allocated along the circumference of the rotor 1. At the same time, the misalignment space between the inner and outer layers of the coil slot where the first branch 21 and the second branch 22 are located can be used to perform inclined cross-welding of the beginning and end of the first branch 21 and the second branch 22 (e.g., Figure 4 In the middle, the first end of the first branch 21 in the inner layer needs to cross over to the end of the second branch 22 in the outer layer for welding and connection, which also conforms to... Figure 3 (Schematic diagram requirements).

[0037] Furthermore, in the same series branch 2, the first branch 21 and the second branch 22 are connected in series across the inner and outer layers of the coil slot by the second conductive element 5.

[0038] In this embodiment, since the first branch 21 and the second branch 22 are located in the inner and outer layers (or outer and inner layers) of the coil slot respectively, directly bending and welding through the beginning end of the first coil or the end of the last coil can easily cause the crossing lines of different coils to cross and contact, causing interference or even short circuits. Therefore, a second conductive element 5 needs to be set independently for bridging to ensure the spacing between the first branch 21 and the second branch 22.

[0039] Furthermore, the second conductive element 5 is a horizontal piece parallel to the top surface of the rotor 1, and the two ends of the second conductive element 5 are welded to the first branch 21 and the second branch 22 respectively.

[0040] In this embodiment, the second conductive element 5 is preferably a horizontal component parallel to the top surface of the rotor 1. Firstly, the horizontal component has a simple structure, low processing difficulty, and can be mass-produced in a standardized manner, reducing manufacturing costs. It is only necessary to bend the relatively soft coil windings in the first branch 21 and the second branch 22 to both ends of the second conductive element 5. Moreover, since the coil windings are made of flexible metal, they can maintain an inclined state after bending, which can ensure that the force at the solder joint is uniform.

[0041] Example 2 In the same coil, the connection between the tail end of the incoming line 211 and the head end of the return line 212 is changed to be integrally cast.

[0042] In this embodiment, to further reduce the number of welding steps, the tail end of the inlet line 211 and the head end of the return line 212 can be integrally formed (e.g., Figure 5 As shown in the figure, the welding of the solder joint 3 below the rotor 1 is reduced, and each coil only needs to be placed once.

[0043] It should be noted that, since the coils are arranged sequentially, the placement order can be to first place the branches located in the inner layer of the coil slots (such as...). Figure 4 The first branch 21) coil, and then the outer branch of the coil slot (such as Figure 4 The coil of the second branch 22). In addition, there are several ways to place the coil. It can be inserted into the two coil slots corresponding to the beginning end of the coil inlet 211 and the end end of the return line 212, and then the beginning end of the inlet 211 and the end end of the return line 212 can be tilted and bent; or the coil can be directly put on and then the beginning end of the inlet 211 and the end end of the return line 212 can be adjusted.

[0044] Other configurations and operations of a doubly fed motor rotor structure according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0045] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A doubly-fed motor rotor structure, characterized in that: It includes a rotor and multiple series branches; the outer circumference of the rotor is provided with multiple coil slots according to a preset number of slots, and the slot numbers of the multiple coil slots are marked in sequence along the clockwise or counterclockwise direction; The multiple series branches are connected in parallel, and the series branches are formed by connecting at least one first branch and at least one second branch in series; The coils of the first branch and the second branch are wound sequentially in the coil slots according to the slot numbers; the first branch and the second branch are wound in the inner and outer layers of the coil slots, respectively, or the first branch and the second branch are wound in the outer and inner layers of the coil slots, respectively. In the first branch and the second branch, the solder joints of each coil are soldered to the top and bottom of the rotor, respectively.

2. The doubly-fed motor rotor structure according to claim 1, characterized in that: In the first branch and the second branch, each coil is composed of an independent incoming line and an independent return line connected in series, and the incoming line and the return line are respectively housed in two coil slots separated by pitch; In the same coil, the beginning of the incoming line is welded to the end of the return line of the previous coil above the rotor to form the solder joint; the end of the incoming line is welded to the beginning of the return line below the rotor to form the solder joint; the end of the return line is welded to the beginning of the incoming line of the next coil above the rotor to form the solder joint.

3. The doubly-fed motor rotor structure according to claim 1, characterized in that: The beginning and end of all the series branches are wound above or below the rotor, and the beginning and end of all the series branches are welded to the first conductive element.

4. The doubly-fed motor rotor structure according to claim 3, characterized in that: The first conductive element is a ring arranged along the circumference of the rotor, and the first and last ends of the series connections of all the series branches extend longitudinally and are welded to the first conductive element.

5. The doubly-fed motor rotor structure according to claim 1, characterized in that: The solder joint of the first branch is located between the solder joints of two adjacent second branches.

6. The doubly-fed motor rotor structure according to claim 1, characterized in that: In the same series branch, the first branch and the second branch are connected in series end to end across the inner and outer layers of the coil slot via a second conductive element.

7. The doubly-fed motor rotor structure according to claim 6, characterized in that: The second conductive element is a horizontal piece parallel to the top surface of the rotor, and its two ends are welded to the first branch and the second branch, respectively.

8. The doubly-fed motor rotor structure according to claim 2, characterized in that: In the same coil, the tail end of the incoming line and the head end of the return line are integrally formed.

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