Superconducting synchronous motor stator structure with radial coil arrangement

Abstract

The invention discloses a superconducting synchronous motor stator structure with radial coils arranged, and belongs to the technical field of motors, the superconducting synchronous motor stator structure with radial coils arranged comprises a stator core and superconducting coils, the stator core is provided with a plurality of stator teeth which are uniformly distributed on the circumference, a stator yoke is arranged between adjacent stator teeth, and the superconducting coils are arranged on the stator yoke. And the superconducting coils are wound on a stator yoke of the stator iron core in a crossing manner to realize radial arrangement of the superconducting coils. By adopting the superconducting synchronous motor stator structure with the radial coils arranged, the space utilization rate of the stator coils is optimized. The design can increase the number of pole pairs of the motor, thereby reducing the saturation degree of the iron core, and improving the power density of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a superconducting synchronous motor stator structure with radially arranged coils. Background Art

[0002] In recent years, power requirements have been increasing in many fields, including the aviation industry. While traditional fuels offer high energy density, they also generate significant carbon emissions. Therefore, electric drive technology is considered a key path to achieving a green, environmentally friendly, and low-carbon transition. Compared to conventional motors, superconducting motors offer advantages such as small size, high power density, and high efficiency, which are even more pronounced under high-power conditions. These advantages provide key technical support for the compact design and economical operation of large aircraft. However, due to the compact structure of superconducting motors, the space occupied by the stator core is limited. The physical size of the superconducting coils directly affects further improvements in power density, affecting the performance of the superconducting motor. The increased temperature caused by the crowded coil arrangement can also lead to a series of problems such as quenching and higher AC losses.

[0003] Currently, superconducting motors are divided into rotor-type superconducting motors and stator-type superconducting motors. Both significantly improve the power density of the motor. The main difference lies in whether the superconducting coils or superconducting blocks used to replace the copper coils are located in the stator or rotor. The rest of the structure is roughly the same as that of ordinary motors. If only superconducting tape is used to replace the copper coils, the amount of superconducting tape used will increase significantly, significantly increasing the manufacturing cost of the superconducting motor. In addition, some superconducting motors use a coreless structure to increase power density. However, with this structure, the AC loss generated by the superconducting tape will be greater, the operating current will be more affected by the background magnetic field, and the critical current will become smaller. Moreover, in rotor-type superconducting motors, the centrifugal force caused by the superconducting coils during rotation will also cause the critical current to decrease, which is disadvantageous for the superconducting motor.

[0004] At present, the superconducting coils of stator-type superconducting motors occupy a large space in the motor, resulting in saturation of the core magnetic circuit of the superconducting motor, making it difficult to increase the number of pole pairs of the motor, which in turn affects the improvement of the motor's power density. Summary of the Invention

[0005] The purpose of the present invention is to provide a superconducting synchronous motor stator structure with a radial coil arrangement, which is used to solve the problem that the superconducting coils in the superconducting motor stator structure occupy a large annular space, resulting in saturation of the iron core magnetic circuit, difficulty in increasing the number of pole pairs, and increased power density of the superconducting motor.

[0006] To achieve the above-mentioned objectives, the present invention provides a superconducting synchronous motor stator structure with a radial coil arrangement, comprising a stator core and a superconducting coil. The stator core is provided with a plurality of stator teeth evenly distributed around the circumference, a stator yoke is provided between adjacent stator teeth, and the superconducting coil is wound across the stator yoke of the stator core to realize the radial arrangement of the superconducting coil.

[0007] Preferably, the stator teeth are made of magnetic conductive material to guide the magnetic field into the air gap between the stator and the rotor of the motor, thereby achieving electromagnetic coupling of the stator and rotor magnetic fields.

[0008] Preferably, the superconducting coil is a racetrack-shaped coil structure, and the superconducting coil is made of high-temperature superconducting tape.

[0009] Preferably, there are 3n stator yokes, where n is the number of pole pairs of the motor, and currents of different phases are respectively passed through the superconducting coils on three adjacent stator yokes to generate a rotating magnetic field.

[0010] Preferably, the gaps between the stator teeth opposite to each other on both sides of the superconducting coil are respectively a first gap and a second gap, and the widths of the first gap and the second gap are equal.

[0011] Preferably, the gap between the inner side of the superconducting coil and the inner and outer surfaces of the stator yoke is the third gap.

[0012] Preferably, the radial gap between the end surface of the tooth portion of the stator tooth and the outer side of the superconducting coil is a fourth gap, and the end surface of the tooth portion of the stator tooth is higher than the outer side of the superconducting coil.

[0013] Preferably, a support plate, a cooling channel, a magnetic circuit guide or a combination thereof is provided in the first gap, the second gap, the third gap and the fourth gap.

[0014] Therefore, the present invention adopts the above-mentioned superconducting synchronous motor stator structure with radial coil arrangement, which has the following beneficial effects:

[0015] (1) The superconducting coil is wound across the yoke of the stator core, which enables the superconducting coil to be arranged radially, optimizing the space utilization of the stator coil. The radial arrangement of the superconducting coil can increase the number of pole pairs of the motor, thereby reducing the saturation of the core and improving the power density of the motor. It is also easy to process.

[0016] (2) The superconducting coil uses high-temperature superconducting tape, which not only improves the power density of the superconducting motor, but also adapts to compact structure and high-temperature working environment.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic structural diagram of a superconducting synchronous motor stator structure with radial coil arrangement provided by an example of the present invention;

[0019] Figure 2 This is a schematic diagram of the magnetic field of a superconducting synchronous motor stator structure with radial coil arrangement provided by an example of the present invention after providing three-phase current;

[0020] Figure 3 1 is a partial cross-sectional schematic diagram of a superconducting synchronous motor stator structure with radial coil arrangement provided by an example of the present invention;

[0021] Figure 4 1 is a schematic structural diagram of a superconducting coil provided by an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the distribution of superconducting coils in the prior art.

[0023] Reference numerals

[0024] 1. Stator core; 11. Stator teeth; 12. Stator yoke; 2. Superconducting coil; 3. First gap; 4. Second gap; 5. Third gap; 6. Fourth gap. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] like Figure 1The stator structure of a superconducting synchronous motor with a radial coil arrangement is shown, comprising a stator core 1 and superconducting coils 2. The stator core 1 is provided with a number of stator teeth 11 evenly spaced around the circumference. This evenly spaced arrangement creates symmetry in the magnetic field between the stator and rotor air gaps, reducing the harmonic content of the air gap magnetic field and the motor's vibration noise. Each stator tooth 11 has an identical structure and is circumferentially made of magnetically conductive material. This guides the magnetic field into the air gap between the stator and rotor, achieving electromagnetic coupling between the stator and rotor magnetic fields and reducing leakage magnetic fields within the stator.

[0028] A stator yoke 12 is provided between adjacent stator teeth 11. The superconducting coil 2 is wound across the stator yoke 12 of the stator core 1 to realize radial arrangement of the superconducting coil 2, and the superconducting coil 2 is evenly distributed circumferentially, which changes the winding direction of the superconducting coil 2, thereby improving the utilization rate of the stator space to increase the number of pole pairs of the motor, thereby reducing the saturation of the iron teeth, reducing the thickness of the motor stator yoke 12, and reducing the end length of the superconducting tape, thereby improving the power density of the motor and reducing the cost.

[0029] The direction of the magnetic field generated by the superconducting coil 2 flows along the stator yoke 12. There are 3n stator yokes 12, where n is the number of pole pairs of the motor. Figure 2 As shown, the superconducting coils 2 on the three adjacent stator yokes 12 are respectively fed with currents of different phases (phase A, phase B, phase C), generating a rotating magnetic field. The number of pole pairs depends on the number of groups of superconducting coils 2, which optimizes the space utilization of the stator coils and can increase the number of pole pairs of the motor, thereby reducing the saturation of the core and improving the power density of the motor. The superconducting coil 2 is a racetrack-shaped coil structure, as shown in FIG. Figure 4 As shown, the racetrack-shaped coil structure is simple to wind and has a mature processing technology; the racetrack-shaped coil structure has good mechanical and thermal properties, which contributes to the safe and stable operation of the superconducting coil 2. The racetrack-shaped coil structure has a higher degree of matching with the motor in terms of structure and performance, and the coil utilization rate is higher. The superconducting coil 2 uses high-temperature superconducting tape. Common high-temperature superconducting tapes mainly include bismuth (Bi) and yttrium barium copper oxide (YBCO). Bi-based high-temperature superconducting tapes have higher critical temperatures and critical current densities under magnetic fields, and the preparation process is relatively mature; YBCO-based high-temperature superconducting tapes have higher critical current density and better magnetic field performance, and have advantages in high-field applications. They can be selected according to actual needs. It not only improves the power density of the superconducting motor, but also shows significant advantages in compact structure and high-temperature working environment. As Figure 5 As shown, the superconducting coils 2 are all wound around the teeth of the stator core 1 in the circumferential direction. The superconducting coils 2 occupy a large circumferential space, resulting in saturation of the core magnetic circuit and low space utilization in the diameter direction. As a result, the number of superconducting coils 2 in the stator core 1 structure is limited, resulting in a small number of pole pairs, which limits the power density of the superconducting motor.

[0030] like Figure 3 As shown, the spacing between the stator teeth 11 on opposite sides of the superconducting coil 2 is a first gap 3 and a second gap 4, respectively. The first gap 3 and the second gap 4 are equal. The spacing between the inner side of the superconducting coil 2 and the inner and outer surfaces of the stator yoke 12 is a third gap 5. The radial distance between the end face of the stator tooth 11 and the outer side of the superconducting coil 2 is a fourth gap 6. The end face of the stator tooth 11 is higher than the outer side of the superconducting coil 2.

[0031] The sizes of the first gap 3, the second gap 4, the third gap 5 and the fourth gap 6 are related to the power of the motor. The larger the power, the larger the gap. The first gap 3, the second gap 4, the third gap 5 and the fourth gap 6 are provided with support plates, cooling channels, magnetic circuit guides or a combination thereof. The support plates are used for structural support of the superconducting coil 2 to ensure its fixity, enhance the stress characteristics of the superconducting coil 2 and prevent stress peeling problems. The cooling channels are used to cool the superconducting coil 2 to ensure that it operates at the required ambient temperature, prevent quenching, and further ensure safety and stability. The magnetic circuit guide guides the magnetic field distribution around the superconducting coil 2, reduces the vertical magnetic field strength to which the superconducting coil 2 is subjected, reduces the influence of the background magnetic field in space, increases the critical current and reduces AC loss. The corresponding external equipment should be set according to the actual design needs.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A superconducting synchronous motor stator structure with radial coil arrangement, comprising a stator core and superconducting coils, characterized in that: The stator core is provided with a number of stator teeth evenly distributed around the circumference, a stator yoke is provided between adjacent stator teeth, and the superconducting coil is wound across the stator yoke of the stator core to realize radial arrangement of the superconducting coil.

2. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: The stator teeth are made of magnetic conductive material to guide the magnetic field into the air gap between the stator and rotor of the motor, thereby achieving electromagnetic coupling between the stator and rotor magnetic fields.

3. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: The superconducting coil has a racetrack-shaped coil structure and is made of high-temperature superconducting tape.

4. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: There are 3n stator yokes, where n is the number of pole pairs of the motor. Currents of different phases are passed through the superconducting coils on three adjacent stator yokes to generate a rotating magnetic field.

5. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: The gaps between the stator teeth opposite to each other on both sides of the superconducting coil are respectively a first gap and a second gap, and the widths of the first gap and the second gap are equal.

6. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: The gap between the inner side of the superconducting coil and the inner and outer surfaces of the stator yoke is the third gap.

7. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: A radial gap between an end surface of a stator tooth and an outer side of the superconducting coil is a fourth gap, and the end surface of the stator tooth is higher than the outer side of the superconducting coil.

8. The superconducting synchronous motor stator structure with radial coil arrangement according to claim 1, characterized in that: Supporting plates, cooling channels, magnetic circuit guides or a combination thereof are provided in the first gap, the second gap, the third gap and the fourth gap.

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