Modular stator structure for aviation motor

Abstract

The invention belongs to the technical field of aviation motors, and particularly relates to a modular stator structure for an aviation motor. Comprising a modularized stator tooth part, a stator yoke part, a flat wire winding and a heat conduction pipe, and the heat conduction pipe comprises a stator groove inner heat conduction pipe, a stator tooth end part heat conduction pipe and a stator yoke end part heat conduction pipe. The modular stator tooth part and the stator yoke part are relatively independent and are connected through specific matching, and the flat wire winding is vertically wound on the modular stator tooth part, so that processing, maintenance and flat wire winding are facilitated; the non-matching surface of the modular stator tooth part can be impregnated with insulating paint, so that slot insulating material is reduced, and the slot fullness rate of the motor is improved; the modular stator tooth part is designed by adopting a high-saturation iron-cobalt-silicon steel sheet material, and the stator yoke part is designed by adopting a conventional silicon steel sheet, so that on the premise of ensuring the performance of the aviation motor, 80-90% of the iron-cobalt-silicon steel sheet material can be saved, and the cost of the motor is effectively reduced; the heat conduction pipe is fully contacted with the flat wire winding, so that the heat dissipation capability and the power density of the motor can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation motors, and in particular relates to a modular stator structure for aviation motors. Background Art

[0002] The aviation field has high power density and high reliability requirements for motors. The stator structure for aviation motors is generally an integrated structure, and the stator teeth and stator yoke are made of the same material in one piece. Under the limitation of the motor outer diameter, the integrated stator structure is more difficult to process when the number of stator teeth is large, the winding cost increases, and it is not easy to repair when the slot insulation or winding insulation is damaged.

[0003] The high power density of aviation motors requires a high degree of saturation of the stator core, especially the saturation of the stator teeth is generally much higher than that of the stator yoke. Therefore, there is a great demand for high-saturation iron-cobalt materials, and the cost of high-saturation iron-cobalt materials is generally high.

[0004] In addition, high-power density, lightweight aviation motors generate a lot of heat, especially the winding temperature rise in the stator slot, which requires the motor to have good heat dissipation conditions. However, the current winding heat dissipation is mostly done by taking heat conduction measures at its end. It is not easy to cool the winding in the slot in the integrated stator structure, which leads to the destruction of the winding insulation and affects the reliability of the aviation motor.

[0005] Aviation motors with high power density, high heat dissipation level and low processing and maintenance costs are becoming increasingly important. Summary of the invention

[0006] Purpose of the invention: To provide a modular stator structure for aircraft motors, to improve the power density of aircraft motors, and to reduce the processing and maintenance costs of aircraft motors.

[0007] Technical solution:

[0008] A modular stator structure for an aircraft motor comprises: a plurality of modular stator units and a stator yoke 2, wherein the modular stator unit comprises: a modular stator tooth 1, a flat wire winding 3, and a heat pipe 4, wherein the modular stator tooth 1 is an independent modular structure, the flat wire winding 3 is vertically wound on the modular stator tooth 1, and the flat wire winding 3 and the modular stator tooth 1 are installed together on the stator yoke 2; the heat pipe 4 comprises a stator slot heat pipe 401, a stator tooth end heat pipe 402 and a stator yoke end heat pipe 403, wherein the stator slot heat pipe 401 is located in the stator slot, the stator tooth end heat pipe 402 is located at the end of the modular stator tooth 1, the stator yoke end heat pipe 403 is located at the end of the stator yoke 2, and the heat pipe 4 is a phase change heat pipe.

[0009] Furthermore, the modular stator tooth portion 1 is formed by laminating high-saturation iron-cobalt-silicon steel sheets. After laminating, the non-matching surface of the modular stator tooth portion 1 is impregnated with insulating varnish, and the matching surface is connected to the stator yoke portion 2 .

[0010] Furthermore, the flat wire winding 3 is a multi-layer thin flat wire with the same phase, which is wound on the modular stator tooth part 1 in the form of short-side vertical winding.

[0011] Furthermore, the stator yoke 2 is formed by laminating silicon steel sheets with a magnetic saturation of less than 1.8 T, and is connected to the mating surface of the modular stator tooth 1 .

[0012] Furthermore, the mating surface of the modular stator tooth portion 1 has a "protrusion", and the connection between the stator yoke portion 2 and the modular stator tooth portion 1 has a "groove". When the modular stator tooth portion 1 is installed on the stator yoke portion 2, the "protrusion" of the modular stator tooth portion 1 is embedded in the "groove" of the stator yoke portion 2.

[0013] Further, two modular stator units form a same-phase unit, and the two flat wire windings 3 in each group are wound with one flat wire; or more than two modular stator units form a same-phase unit, and the multiple flat wire windings 3 in each group are wound with one flat wire.

[0014] Furthermore, after the stator unit group consisting of two or more modular stator units is distributed and installed on the stator yoke 2, the windings between the same-phase units are connected by welding.

[0015] Furthermore, the heat pipe 401 in the stator slot is wedge-shaped, wherein both sides of the heat pipe 401 in the stator slot are in contact with the flat wire winding 3 on both sides respectively; the bottom surface of the heat pipe 401 in the stator slot is in contact with the stator yoke 2; the heat pipe 402 at the end of the stator tooth is located at the end of the modular stator tooth 1 and is in contact with the end of the flat wire winding 3; the heat pipe 403 at the end of the stator yoke is located at the end of the stator yoke 2, the inner circle of the heat pipe 403 at the end of the stator yoke is in contact with the outer circle of the flat wire winding 3, and the outer circle of the heat pipe 403 at the end of the stator yoke is in contact with the motor housing.

[0016] Beneficial effects:

[0017] 1. The modular stator teeth of the present invention are made of highly saturated iron-cobalt-silicon steel sheets laminated together, which effectively reduces the saturation degree of the motor stator teeth, while reducing the size of the stator teeth, increasing the slot area, and the power density of the motor is high;

[0018] 2. The stator yoke of the present invention is made of conventional silicon steel sheets laminated together, which can save 80-90% of the iron-cobalt silicon steel sheet material while ensuring the performance of the aviation motor, effectively reducing the cost of the motor;

[0019] 3. The modular stator teeth in the present invention are independent modular structures, and the non-matching surfaces thereof can be impregnated with insulating paint, which saves the process and materials for slot insulation and improves the slot fill rate of the motor; and the independent modular stator teeth facilitate the winding of the flat wire winding, and the stator teeth are conveniently connected to the stator yoke, which greatly reduces the processing and maintenance costs of the motor;

[0020] 4. The heat pipe structure in the present invention is in close contact with the flat wire winding and can be designed into a specific shape according to the shape and layout of the winding. Since the modular stator teeth and the stator yoke are independent of each other, the installation of the heat pipe is also relatively simple, which greatly improves the heat dissipation level of the flat wire motor winding and increases the power density and reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a 1 / 4 axial schematic diagram of a modular stator structure for aviation motors;

[0023] Figure 2 It is the axial schematic diagram of the modular stator teeth;

[0024] Figure 3 It is a structural schematic diagram of the heat transfer pipe part;

[0025] In the figure, 1. modular stator teeth; 2. stator yoke; 3. flat wire winding; 4. heat pipe; 401. heat pipe in stator slot; 402. heat pipe at the end of stator teeth; 403. heat pipe at the end of stator yoke. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 3 As shown, the present invention proposes a modular stator structure for an aircraft motor, wherein, as Figure 1 As shown, the modular stator structure for aircraft motors includes a modular stator tooth portion 1, a stator yoke portion 2, a flat wire winding 3, and a heat pipe 4.

[0028] The modular stator tooth 1 is made of high-saturation iron-cobalt silicon steel sheets, and the non-matching surface is impregnated with insulating paint after lamination, and the end is mounted with the stator tooth end heat pipe 402; the stator yoke 2 is made of silicon steel sheets with a magnetic saturation of less than 1.8T, and the end is mounted with the stator yoke end heat pipe 403. Benefiting from the modular stator structure, the processing, varnishing, and mounting of the heat pipe 4 of the modular stator tooth 1, and the processing and mounting of the heat pipe 4 of the stator yoke 2 are all simpler.

[0029] The modular stator tooth 1 is an independent modular structure, and the flat wire winding 3 is a multi-layer thin flat wire of the same phase, which is wound on the modular stator tooth 1 in the form of short-side vertical winding and contacts the heat pipe 402 at the end of the stator tooth. The matching surface of the modular stator tooth 1 has a "dovetail protrusion", and the connection between the stator yoke 2 and the modular stator tooth 1 has a "dovetail groove". When the flat wire winding 3 is installed on the stator yoke 2 along with the modular stator tooth 1, the "dovetail protrusion" of the modular stator tooth 1 is embedded in the "dovetail groove" of the stator yoke 2.

[0030] After the modular stator teeth 1 and the flat wire windings 3 are installed together on the stator yoke 2, the same-phase flat wire windings 3 wound on different modular stator teeth 1 are connected by welding, and the connecting wire contacts the heat pipe 403 at the end of the stator yoke.

[0031] Heat pipe topology: The heat pipe 401 in the "wedge-shaped" stator slot is synchronously installed circumferentially on the stator yoke 2 when the modular stator teeth 1 are installed, and contacts the slot part of the flat wire winding 3. The heat pipe 4 of each part is led out radially from the end and connected to the motor heat dissipation structure for heat transfer. The heat pipe 4 can be designed in different shapes according to the shape and layout of the flat wire winding 3.

[0032] In a possible embodiment, the heat pipe 401 in the stator slot is wedge-shaped, wherein both sides of the heat pipe 401 in the stator slot are in contact with the flat wire winding 3 on both sides respectively; the bottom surface of the heat pipe 401 in the stator slot is in contact with the stator yoke 2; the heat pipe 402 at the end of the stator tooth is located at the end of the modular stator tooth 1 and is in contact with the end of the flat wire winding 3; the heat pipe 403 at the end of the stator yoke is located at the end of the stator yoke 2, the inner circle of the heat pipe 403 at the end of the stator yoke is in contact with the outer circle of the flat wire winding 3, and the outer circle of the heat pipe 403 at the end of the stator yoke is in contact with the motor housing.

[0033] In a possible embodiment, the modular stator teeth 1, the flat wire windings 3, and the heat pipes 4 form a modular stator unit. Two modular stator units form a same-phase unit, and the two flat wire windings 3 in each group are wound with one flat wire; or more than two modular stator units form a same-phase unit, and the multiple flat wire windings 3 in each group are wound with one flat wire.

[0034] For example, for a three-phase motor with 1 unit motor, let α be the slot angle, let K be the remainder of α to 360°, p be the number of rotor pole pairs, and Qs be the number of stator slots, that is:

[0035]

[0036] K = α mod 360°

[0037] If |K-360°|<120°, and When |K-360°|>120°, Qs is an odd number, and When the same phase winding is wound on adjacent motor teeth in a 60° phase belt winding situation, a winding structure such as a 9-slot / 8-pole motor can be formed. In the above case, the same phase winding can be directly wound on the corresponding modular stator teeth without welding to form a same phase unit, which is then installed on the stator yoke.

[0038] In a possible embodiment, after the same-phase units formed by two or more modular stator units are distributed and installed on the stator yoke 2, the windings between each of the same-phase units are connected by welding.

[0039] For example, when the number of unit motors is greater than 1, but the combination of the number of motor pole pairs / stator slots still meets the above conditions, the modular stator unit composed of the modular stator teeth wound by the same-phase winding is a distributed combined topology. That is, two or more modular stator units corresponding to the same-phase winding in the same unit motor are adjacent to each other and constitute a same-phase unit, while the corresponding same-phase units in different unit motors are not adjacent. At this time, the windings of the same-phase units are connected by welding, which reduces the number of welding points, such as 18-slot / 16-pole motors.

[0040] The above is only an embodiment of the present invention, and more specifically, it is implemented in a modular stator structure for an aviation motor, but it is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention, such as changing the number of modular stator teeth (1) in this embodiment to other reasonable values; or modifying it to an outer rotor motor or an axial flux motor according to the requirements of the actual scenario for the motor, but still using a relatively independent structure of modular stator teeth and stator yoke; or according to processing requirements, motor performance and other requirements, the connecting "grooves" and "protrusions" between the modular stator teeth and the stator yoke change shape or position, but still using a relatively independent structure of modular stator teeth and stator yoke; or the stator yoke in the modular stator structure is made of high-saturation iron-cobalt silicon steel sheets, and the modular stator teeth are made of conventional silicon steel sheets, etc., and the teeth and yoke are replaced with other materials, which should also be included in the protection scope of the present invention.

Claims

1. A modular stator structure for an aircraft motor, characterized in that: include: A plurality of modular stator units and a stator yoke (2), wherein the modular stator unit comprises: a modular stator tooth (1), a flat wire winding (3), a heat pipe (4), The modular stator tooth portion (1) is an independent modular structure, the flat wire winding (3) is vertically wound on the modular stator tooth portion (1), and the flat wire winding (3) and the modular stator tooth portion (1) are installed together on the stator yoke portion (2); the heat conducting pipe (4) comprises a heat conducting pipe (401) in a stator slot, a heat conducting pipe (402) at the end of a stator tooth, and a heat conducting pipe (403) at the end of a stator yoke, wherein the heat conducting pipe (401) in a stator slot is located in the stator slot, the heat conducting pipe (402) at the end of the stator tooth is located at the end of the modular stator tooth portion (1), and the heat conducting pipe (403) at the end of the stator yoke is located at the end of the stator yoke portion (2), and the heat conducting pipe (4) is a phase change heat pipe.

2. The modular stator structure for an aircraft motor according to claim 1, characterized in that: The modular stator teeth (1) are formed by laminating high-saturation iron-cobalt-silicon steel sheets. After laminating, the non-matching surfaces of the modular stator teeth (1) are impregnated with insulating varnish, and the matching surfaces are connected to the stator yoke (2).

3. The modular stator structure for an aircraft motor according to claim 1, characterized in that: The flat wire winding (3) is a multi-layer thin flat wire with the same phase, which is wound on the modular stator tooth part (1) in the form of short-side vertical winding.

4. The modular stator structure for an aircraft motor according to claim 1, characterized in that: The stator yoke part (2) is formed by laminating silicon steel sheets with a magnetic saturation of less than 1.8 T, and is connected to the matching surface of the modular stator tooth part (1).

5. The modular stator structure for an aircraft motor according to claim 1, characterized in that: The matching surface of the modular stator tooth portion (1) has a "protrusion", and the connection between the stator yoke portion (2) and the modular stator tooth portion (1) has a "groove". When the modular stator tooth portion (1) is installed on the stator yoke portion (2), the "protrusion" of the modular stator tooth portion (1) is embedded in the "groove" of the stator yoke portion (2).

6. The modular stator structure for an aircraft motor according to claim 3, characterized in that: Two modular stator units form a same-phase unit, and the two flat wire windings (3) in each group are wound with one flat wire; or more than two modular stator units form a same-phase unit, and the multiple flat wire windings (3) in each group are wound with one flat wire.

7. The modular stator structure for an aircraft motor according to claim 6, characterized in that: After a plurality of groups of same-phase units consisting of two or more modular stator units are distributed and installed on the stator yoke (2), the windings between the same-phase units are connected by welding.

8. The modular stator structure for an aircraft motor according to claim 1, characterized in that: The heat conducting pipe (401) in the stator slot is wedge-shaped, wherein the two sides of the heat conducting pipe (401) in the stator slot are respectively in contact with the flat wire windings (3) on the two sides; the bottom surface of the heat conducting pipe (401) in the stator slot is in contact with the stator yoke (2); the heat conducting pipe (402) at the end of the stator tooth is located at the end of the modular stator tooth (1) and is in contact with the end of the flat wire winding (3); the heat conducting pipe (403) at the end of the stator yoke is located at the end of the stator yoke (2), the inner circle of the heat conducting pipe (403) at the end of the stator yoke is in contact with the outer circle of the flat wire winding (3), and the outer circle of the heat conducting pipe (403) at the end of the stator yoke is in contact with the motor housing.

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