Winding connection structure of double-winding motor

Abstract

The utility model relates to the field of motors, in particular to a winding connection structure of a double-winding motor. Comprising a stator core and windings, the windings comprise running windings and backup windings, stator grooves are formed in the stator core, each stator groove is internally provided with one running winding and one backup winding, and running coils in the running windings and backup coils in the backup windings are connected in an up-down equally-divided mode. According to the utility model, the upper and lower coils are equally distributed into each branch of each set of winding in each slot, so that the number of the upper and lower coils on each branch is equal, even if the inductance of the upper and lower coils in each slot is not equal, the inductance of the upper and lower coils on each branch is equal, and the inductance of the upper and lower coils on each branch is not equal. Therefore, the inductance value of each branch can be ensured to be equal. The connection structure can effectively eliminate unequal inductance between the working winding and the backup winding.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically to a winding connection structure for a dual-winding motor. Background Technology

[0002] Permanent magnet synchronous motors play a crucial role in high-end military fields such as aerospace and weaponry due to their high power density and high efficiency. Since these fields have extremely high requirements for the reliability of motors, winding backup fault-tolerant technology has emerged.

[0003] The winding backup fault-tolerant technology specifically equips each stator slot with two sets of windings arranged in an upper-lower layer. If one set of windings fails, the system can immediately switch to the other set, ensuring the continuous and stable operation of the motor. However, the traditional dual-winding connection method is a same-layer connection, meaning that the working winding or backup winding is entirely on the upper or lower layer. Therefore, the inductance values ​​of the working winding and backup winding will differ. This can cause a mismatch between the controller parameters and the actual motor parameters during winding switching, leading to problems such as increased motor current and aggravated torque fluctuations, severely affecting the motor's fault-tolerant performance.

[0004] The main reason for the asymmetry in the inductance of the two sets of windings is that, in the same slot, the two sets of coils are in different positions, resulting in different inductances. When these coils are connected into windings and the same layer connection method is continued, this asymmetry will be further aggravated. Especially in environments with large slot depth and high operating frequency, this asymmetry will have a more significant impact on motor performance. Utility Model Content

[0005] This invention proposes a winding connection structure for a dual-winding motor. By changing the winding connection method between the running winding and the backup winding, the problem of differences in the inductance values ​​of the two windings is solved, ensuring that the controller parameters can maintain a high degree of matching with the actual parameters of the motor when switching windings, thereby further improving the operating performance of the fault-tolerant motor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model discloses a winding connection structure for a dual-winding motor, including a stator core, wherein the stator core is provided with stator slots, and each stator slot is provided with a winding; the winding includes a running winding and a backup winding, wherein the upper and lower coils that make up the running winding and the backup winding are connected equally vertically.

[0008] As a further improvement, the number of coil turns in each phase and branch of the operating winding or backup winding is an even number.

[0009] As a further improvement, when there are n coils in the stator slot, the ratio of the number of coils in each phase and branch of the running winding or backup winding to n is an integer.

[0010] As a further improvement, the number of upper coil turns in each branch of each phase of the running winding or backup winding is the same as that in the lower winding.

[0011] As a further improvement, the upper coil and the lower coil are connected in series.

[0012] As a further improvement, the stator slots are evenly spaced along the circumference of the stator core.

[0013] As a further improvement, the upper coil is connected to the lower coil to meet the winding connection method of a three-phase rotating motor.

[0014] As a further improvement, the running winding and the backup winding are double-layer windings.

[0015] As a further improvement, the running winding and the backup winding are single-layer windings.

[0016] As a further improvement, the coil parameters of the running winding and the backup winding are the same.

[0017] Compared with the prior art, this utility model achieves the following technical effects:

[0018] In this invention, the coils in the stator slots are connected in a way that differs from traditional same-layer connections. Instead, the upper and lower coils are evenly distributed across each branch of each winding in each slot, ensuring an equal number of upper and lower coils on each branch. This means that even if the inductances of the upper and lower coils in each slot are not equal, the equal number of coils on each branch guarantees an equal inductance value. This connection structure effectively eliminates inductance asymmetry between the working and backup windings, preventing problems such as increased current and torque fluctuations. Furthermore, it improves the reliability of the fault-tolerant motor, ensuring stable performance during winding switching. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the winding connection structure of the dual-winding motor of this utility model;

[0020] Figure 2 This is a schematic diagram of the winding connection structure of the dual-winding motor of this utility model;

[0021] Figure 3 This is a schematic diagram of the winding connection structure of a conventional dual-winding motor.

[0022] Figure 4The existing winding structure is for phase A inductance;

[0023] Figure 5 The existing winding structure is for the B-phase inductor;

[0024] Figure 6 The existing winding structure is for the C-phase inductor;

[0025] Figure 7 This utility model relates to the winding structure of phase A inductor.

[0026] Figure 8 This utility model relates to the winding structure of the B-phase inductor.

[0027] Figure 9 This utility model relates to the winding structure of the C-phase inductor.

[0028] Reference numerals: 1. Stator core; 2. Winding. Detailed Implementation

[0029] The embodiments of this application are described in detail below, examples of which are illustrated 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 application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] like Figure 3 The diagram shows the winding connection structure of an existing dual-winding motor. The traditional connection method is a same-layer connection, specifically, there are two sets of coils in each slot, namely the upper coil and the lower coil, which are arranged vertically. Because the magnetic field environment of the upper and lower coils in each slot is different, their inductance values ​​are different. When these coils are connected into windings, if the same-layer connection method is continued, this inductance asymmetry will be further aggravated, thus adversely affecting the performance of the motor. Furthermore, if the inductance values ​​of the working winding and the backup winding are inconsistent, the controller parameters will be difficult to match with the actual parameters of the motor when switching winding 2, leading to a series of problems such as increased current and aggravated torque fluctuations.

[0032] This embodiment uses a 6-pole, 24-slot winding motor as an example for illustration, but the application is not limited to 6-pole, 24-slot motors; other numbers of slots can also be used, depending on specific actual needs and application scenarios. Figure 1 and Figure 2As shown, the present invention discloses a winding connection structure for a dual-winding motor, including a stator core 1, wherein the stator core 1 is provided with stator slots, and each stator slot is provided with a winding 2; the winding 2 includes a running winding and a backup winding, wherein the upper coil and the lower coil that make up the running winding and the backup winding are connected equally vertically.

[0033] The embodiment proposes an evenly distributed connection structure for the upper and lower coils, ensuring that the number of upper and lower coils in each branch of each set is equal. This design aims to guarantee equal inductance for each branch even if the inductances of the upper and lower coils in each slot are unequal. This ensures that the coil parameters of the two sets of windings 2 are completely identical, avoiding the problems of increased current and torque fluctuations caused by inductance asymmetry, and improving the reliability of the fault-tolerant motor. Figure 1 In the diagram, red represents phase A, green represents phase B, and blue represents phase C, used to distinguish the windings.

[0034] The number of turns in each phase and branch of the running winding or backup winding is even. In this embodiment, to ensure that the coil parameters of the running winding and the backup winding are exactly the same, setting the number of turns to an even number of coils, based on this design requirement, can better ensure that the number of turns in the upper and lower layers of the running winding and backup winding 2 are the same.

[0035] When there are n coils in the stator slot, the ratio of the number of coils in each phase and branch of the running winding or backup winding to n is an integer. In this embodiment, since the number of coils n in the stator slot is a fixed value, representing the total number of coils available for placement in the motor stator, these coils are organized into different windings 2, including running windings and backup windings, to support the normal operation and specific functions of the motor. When the ratio of the number of coils in each phase and branch to n is an integer, the purpose is to make the winding 2 design have a certain regularity and consistency, which helps to improve the electromagnetic performance and reliability of the motor. A regular winding 2 layout can eliminate inductance imbalance.

[0036] The number of upper and lower coils is the same for each phase and branch of the running or backup winding. In the embodiment, the upper and lower coils in each stator slot are arranged vertically. When all the coils in the stator slot are connected into winding 2 according to a certain rule, the upper and lower coils are connected equally. Therefore, the number of upper and lower coils is the same for each phase and branch of each set of winding 2.

[0037] The upper and lower coils are connected in series. In this embodiment, a series connection is preferred. When making the connection, it is first necessary to determine the polarity of the upper and lower coils to ensure they can be correctly connected in series.

[0038] Connect one end of the running coil to one end of the backup coil, and then connect the other ends of the two coils to the two pins of the power supply respectively, thus forming a series circuit; however, it is not limited to this, and parallel connection can also be selected according to different motor design requirements and usage scenarios. Choose the appropriate connection method according to different actual requirements.

[0039] When the upper coil is connected to the lower coil, it satisfies the winding connection method of a three-phase rotating motor. The winding connection method of a three-phase rotating motor is a common existing technology. In this utility model, when the upper coil and the lower coil are connected equally, the wiring method is the same as that of the existing technology.

[0040] The running winding and the backup winding can be double-layered windings. Alternatively, they can be single-layered windings. The winding 2 structure is selected based on the specific design and application requirements of the motor, specifically determined by factors such as motor performance requirements, manufacturing costs, operating efficiency, and reliability.

[0041] like Figure 4 , Figure 5 as well as Figure 6 The diagram shown is a schematic of a three-phase inductor with a conventional winding structure. Figure 6 , Figure 7 as well as Figure 8 The diagram shown is a schematic of the three-phase inductor winding structure of this utility model. According to calculations, the inductances of the two sets of in-phase windings in the traditional structure have a large difference. When switching from the running winding to the backup winding, the difference in inductance will cause the controller and motor to become mismatched, resulting in increased current and larger torque fluctuations, which will affect fault-tolerant operation. With the winding structure proposed in this patent, the inductance waveforms of the two sets of in-phase windings 2 are completely overlapped, eliminating the difference in winding parameters 2 and improving fault-tolerant operation performance.

[0042] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0045] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A winding connection structure for a dual-winding motor, characterized in that, It includes a stator core, wherein the stator core is provided with stator slots, and each stator slot is provided with a winding; the windings include a running winding and a backup winding, wherein the upper and lower coils that make up the running winding and the backup winding are connected equally vertically.

2. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, The number of coil turns in each phase and branch of the running or backup winding is even.

3. The winding connection structure of a dual-winding motor according to claim 2, characterized in that, When there are n coils in the stator slot, the ratio of the number of coils in each phase and branch of the running winding or backup winding to n is an integer.

4. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, The number of upper and lower coils is the same for each phase and branch of the running or backup winding.

5. The winding connection structure of a dual-winding motor according to claim 4, characterized in that, The upper coil and the lower coil are connected in series.

6. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, The stator slots are evenly spaced along the circumference of the stator core.

7. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, When the upper coil is connected to the lower coil, it satisfies the winding connection method of a three-phase rotating motor.

8. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, The running winding and the backup winding are double-layer windings.

9. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, The running winding and the backup winding are single-layer windings.

10. The winding connection structure of a dual-winding motor according to claim 1, characterized in that, The coil parameters of the running winding and the backup winding are the same.

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