A high-speed motor structure integrated on the engine main shaft

Abstract

The invention relates to a high-speed motor structure integrated with an engine main shaft, comprising: an intake cone, disposed at the front end of the engine casing, with a mounting shaft hole defined in its center; a motor secured to the wall of the mounting shaft hole; a motor rotor assembly, coaxially disposed within the motor stator core and sleeved onto the motor shaft, which is connected to the engine main shaft assembly. A fan is mounted on the engine main shaft assembly and is located within the fan casing; the motor rotor assembly and the motor stator core form a motor air gap; the mounting shaft hole of the intake cone is sealed by an end shell to form an end cavity, which communicates with the inner cavity of the fan via the motor air gap. The end cavity is also connected to multiple intake pipes. The present invention achieves the following beneficial effects: a simple structure, efficient cooling using its own air and fuel systems.

Description

Technical Field

[0001] The present invention relates to the technical field of motors for aviation engines, in particular to a high-speed motor structure integrated on an engine main shaft. Background Art

[0002] Engine transmissions include variable-speed and direct-drive. Variable-speed transmissions are typically more complex, while direct-drives are relatively simple and are the preferred choice for aircraft engines. However, direct-drives place high demands on the motor's size, power density, and speed.

[0003] At present, rare earth permanent magnet high-speed motors are the leaders in the field of high-speed motors. They can meet the special needs of the engine in terms of speed, power, volume, etc., can achieve direct drive with the engine main shaft, and can easily integrate starting and power generation functions. However, their high heat density makes its heat dissipation problem not to be underestimated.

[0004] Ordinary engines are usually cooled by gas and liquid. Usually, medium and large power high-speed motors need to add special air and liquid supply structures or devices for cooling to achieve the purpose of temperature control, but this can easily complicate the engine structure.

[0005] Our company adopts direct drive transmission and concentrates it on the engine, on the one hand to simplify the structure, and on the other hand to solve its heat dissipation problem. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-speed motor structure integrated on the engine main shaft with a simple structure, utilizing its own air and fuel system for cooling and having good cooling effect.

[0007] The object of the present invention is achieved through the following technical solution: A high-speed motor structure integrated on the main shaft of an engine, comprising:

[0008] An air intake cone is provided at the front end of the engine casing and has a mounting shaft hole at its center;

[0009] The motor stator core is fixed in the motor casing, and the motor casing is fixed to the wall of the mounting shaft hole;

[0010] The motor rotor assembly is coaxially arranged in the motor stator core, which is sleeved on the motor shaft. The motor shaft is connected to the engine main shaft assembly. The engine main shaft also serves as the motor rotor support structure. A fan is installed on the engine main shaft assembly and the fan is located in the fan casing;

[0011] The motor rotor assembly and the motor stator core form a motor air gap;

[0012] The mounting shaft hole of the air intake cone is sealed by the end shell to form an end cavity, which is connected to the inner cavity where the fan is located through the motor air gap, and the end cavity is also connected to multiple air intake pipes;

[0013] When the fan rotates, it extracts air from the fan casing at the front end of the engine. The airflow formed by the rotation of the fan flushes the surface of the air intake cone, achieving an air-cooling cooling effect.

[0014] Furthermore, it also includes a motor casing, which is fixed on the mounting shaft hole, and the motor stator core is fixed on the inner wall of the motor casing.

[0015] Furthermore, a spiral groove is formed on the cylindrical surface of the motor housing, and the spiral groove and the inner wall of the mounting shaft hole form a spiral cooling channel; one end of the spiral cooling channel is connected to the oil inlet pipe through the oil inlet hole, and the other end is connected to the oil outlet pipe through the oil outlet hole. In other words, the spiral groove achieves an oil cooling effect.

[0016] Preferably, the oil inlet pipe and the oil outlet pipe pass through the engine casing and are attached to the outer wall of the engine casing; the oil inlet pipe and the oil outlet pipe are both connected to the engine's own fuel system.

[0017] Preferably, the air intake pipe is divergently arranged along the air intake cone, and is attached to the outer wall of the engine casing after passing through the engine casing.

[0018] Preferably, the outer conical surface of the air intake cone is designed to be heat dissipation tooth-shaped, which can further improve the heat dissipation effect.

[0019] Furthermore, the fan casing is fixedly connected to the engine casing; the air intake cone is fixed in the fan casing through a support.

[0020] Furthermore, the motor stator core is wound with a motor winding; the motor rotor assembly includes a permanent magnet, and the permanent magnet and the motor stator core form a motor air gap.

[0021] Furthermore, one end of the intake pipe is connected to the end cavity through the intake hole, the intake hole penetrates the motor housing and the intake cone, and the other end of the intake pipe is connected to the compressed air chamber at the rear end of the engine; the oil inlet hole and the oil outlet hole penetrate the intake cone.

[0022] The present invention has the following advantages:

[0023] (1) By arranging the motor at the front end of the engine casing through the air intake cone, when the engine main shaft assembly rotates, it will drive the fan to rotate, and when the fan rotates, it will draw out the outside air, so that the outside cold air will flush the surface of the air intake cone (motor housing) to cool the motor surface. Furthermore, heat dissipation teeth are provided on the outer cylindrical surface of the air intake cone to improve the cooling effect;

[0024] (2) By introducing several streams of compressed air from the rear end of the engine into the cavity at the front end of the motor, the compressed air flows out from the rear end of the motor through the motor air gap, cooling the inside of the motor and the winding ends;

[0025] (3) The opening of the spiral groove on the motor housing realizes oil cooling of the motor stator assembly, further improving the cooling effect; because it uses the engine's own fuel system for cooling, the fuel is also heated during cooling;

[0026] (4) This structure utilizes the engine's own fuel and air systems to achieve a combined effect of liquid cooling and forced air cooling for the motor without adding any additional equipment. It is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is the structural diagram of the motor;

[0029] Figure 3 This is a schematic structural diagram of an air intake cone from an end view;

[0030] Figure 4 Schematic diagram of the cooling air and cooling oil flow;

[0031] Figure 5 This is a front view of the engine front end;

[0032] In the figure: 1-motor shaft, 101-end shell, 102-intake cone, 103-fan casing, 104-fan, 105-support, 106-engine main shaft assembly, 107-oil inlet hole, 108-oil outlet hole, 109-heat dissipation gear, 2-motor casing, 201-intake pipe, 3-motor stator core, 4-motor winding, 5-motor rotor assembly, 6-spiral groove, 7-motor air gap, 8-permanent magnet, 9-intake hole. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0034] like Figures 1 to 5 As shown, a high-speed motor structure integrated on the engine main shaft includes an air intake cone 102, a motor stator core 3, and a motor rotor assembly 5; a fan casing 103 is connected to the end of the aircraft engine casing, a fan 104 is provided in the fan casing 103, and the fan 104 is installed on the engine main shaft assembly 106; the air intake cone 102 is arranged in the front end of the fan casing 103; and the high-speed motor formed by the motor stator core 3, the motor casing 2, the motor winding 4 and the motor rotor assembly 5 is installed on the air intake cone 102.

[0035] like Figure 1 and Figure 3 As shown, the air inlet cone 102 is fixed in the fan casing 103 through the support 105, and the two are coaxially arranged.

[0036] A central axial hole is defined at the center of the intake cone 102. A motor housing 2 is fixedly mounted within this hole. A motor stator core 3 is secured to the inner wall of the motor housing 2. Motor windings 4 are wound around the stator core 3. A motor rotor assembly 5 is coaxially positioned within the cavity of the stator core 3. The motor rotor assembly 5 is connected to the engine main shaft assembly 106 via the motor shaft 1. An air gap 7 is formed between the rotor assembly 5 and the stator core 3.

[0037] like Figure 1 and Figure 2 As shown, the outer end of the intake cone 102 is sealed by the end housing 101, forming an end cavity. This end cavity communicates with the inner cavity where the fan 104 is located via the motor air gap 7. This end cavity is also connected to multiple intake pipes 201. When the engine main shaft assembly 106 rotates, it drives the fan 104 to rotate. When the fan 104 rotates, it extracts air, allowing air to enter the engine interior. Before entering the engine, a large amount of air first flushes the surface of the intake cone 102, cooling the outer surface of the motor. Furthermore, the rotation of the engine main shaft assembly 106 causes the air entering the engine interior to be pressurized at the rear end of the engine, forming compressed air. From the rear end of the engine, the compressed air is introduced into the motor interior through multiple intake pipes 201, cooling the outer walls of the motor winding 4, the motor stator core 3, and the permanent magnets 8.

[0038] In this embodiment, air inlet holes 9 are formed in the motor housing 2 and the air inlet cone 102. The end cavity is connected to the air inlet pipe 201 through the air inlet hole 9. The air inlet pipe 201 is arranged divergently along the air inlet cone 102, passes through the fan case 103, and is attached to the outer walls of the fan case and the engine case.

[0039] In this embodiment, a spiral groove 6 is formed on the cylindrical surface of the motor housing 2. The spiral groove 6 and the inner wall of the mounting shaft hole form a spiral cooling channel. One end of the spiral cooling channel is connected to the oil inlet pipe 202 through the oil inlet hole 107, and the other end is connected to the oil outlet pipe 203 through the oil outlet hole 108. The oil inlet pipe 202 and the oil outlet pipe 203 are both connected to the engine's own fuel system, thus forming a cooling oil circuit. A low-temperature fuel branch is drawn from the front end of the fuel supply circuit of the fuel system and connected to the oil inlet hole 107. A servo valve is installed on this branch to adjust the fuel flow as necessary. Fuel flows from the oil inlet hole 107, passes through the spiral groove 6, and then flows out of the oil outlet hole 108 and returns to the engine fuel circuit system. During this process, the fuel removes heat from the motor and the motor also acts as a heater to heat the fuel, thereby improving fuel utilization.

[0040] In this embodiment, the oil inlet pipe 202 and the oil outlet pipe 203 pass through the fan casing 103 and are attached to the outer wall of the fan casing 103 .

[0041] In this solution, the outer conical surface of the air intake cone 102 is designed to be shaped like heat dissipation teeth 109. When the fan 104 rotates at high speed, a high-speed air flow is formed in the fan casing 103. A large amount of cold air will quickly flush the heat dissipation teeth 109 on the surface of the air intake cone 102, enhancing the heat dissipation capacity of the motor stator surface.

[0042] In this embodiment, air intake holes 9 are evenly designed at the front end of the motor housing 2, and several compressed air branches are led out from the rear end of the engine. Servo valves are set on the branches to adjust the air flow. The compressed air flows into the interior of the motor from the air intake holes 9 of the motor housing 2 through the air intake pipe 201, flows out from the rear end of the motor housing 2 after passing through the motor air gap 7, and then flows through the gap between the air intake cone 102 and the fan 104 to the front end of the fan in the fan casing 103, forming a cooling air flow channel.

[0043] It should be noted that the purpose of fan 104 drawing air is to allow sufficient air to enter the engine to meet its functional needs. This solution simply cools the motor surface by placing the motor in the intake duct at the front of the engine. The air drawn by fan 104 first flushes the heat dissipation teeth 109 on the surface of the intake cone 102 before entering the engine, utilizing the engine's inherent air system to cool the motor.

[0044] Furthermore, the motor in this embodiment functions as both a motor and a generator. During engine startup, the motor acts as a motor, driving the engine main shaft assembly 106. Once engine startup is complete, the motor is driven by the engine main shaft assembly 106, which then acts as a generator. The motor's operating state is controlled by the electrical system, specifically the engine's power system and power generation and supply system.

[0045] The above embodiments merely represent preferred implementations, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art will be able to make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. A high-speed motor structure integrated on an engine main shaft, characterized by: include: An air intake cone (102) is arranged at the front end of the engine casing and has a mounting shaft hole at its center; The motor stator core (3) is fixed in the motor housing (2), and the motor housing (2) is fixed to the wall of the mounting shaft hole; A motor rotor assembly (5) is coaxially arranged in the motor stator core (3), and is sleeved on the motor shaft (1). The motor shaft (1) is connected to the engine main shaft assembly (106). A fan (104) is installed on the engine main shaft assembly (106), and the fan (104) is located in the fan casing (103); The motor rotor assembly (5) and the motor stator core (3) form a motor air gap (7); The mounting shaft hole of the air intake cone (102) is sealed by the end shell (101) to form an end cavity, and the end cavity is connected to the inner cavity where the fan (104) is located through the motor air gap (7), and the end cavity is also connected to multiple air intake pipes (201); When the fan (104) rotates, it extracts air from the fan casing (103) at the engine casing, and also promotes the circulation of air inside the motor; A spiral groove (6) is formed on the cylindrical surface of the motor housing (2), and the spiral groove (6) and the inner wall of the mounting shaft hole form a spiral cooling channel; one end of the spiral cooling channel is connected to the oil inlet pipe (202) through the oil inlet hole (107), and the other end is connected to the oil outlet pipe (203) through the oil outlet hole (108).

2. The high-speed motor structure integrated on the engine main shaft according to claim 1, characterized in that: The oil inlet pipe (202) and the oil outlet pipe (203) pass through the engine casing and are attached to the outer wall of the engine casing; The oil inlet pipe (202) and the oil outlet pipe (203) are both connected to the engine's own fuel system.

3. The high-speed motor structure integrated on the engine main shaft according to claim 2, characterized in that: The air intake pipe (201) is divergently arranged along the air intake cone (102), and is attached to the outer wall of the engine casing after passing through the engine casing.

4. The high-speed motor structure integrated on the engine main shaft according to claim 3, characterized in that: The outer conical surface of the air intake cone (102) is designed to be in the shape of heat dissipation teeth (109).

5. The high-speed motor structure integrated on the engine main shaft according to claim 4, characterized in that: The fan casing (103) is fixedly connected to the engine casing; The air intake cone (102) is fixed in the fan casing (103) via a support (105).

6. The high-speed motor structure integrated on the engine main shaft according to claim 5, characterized in that: The motor stator core (3) is wound with a motor winding (4); The motor rotor assembly (5) comprises a permanent magnet (8), and the permanent magnet (8) and the motor stator core (3) form a motor air gap (7).

7. The high-speed motor structure integrated on the engine main shaft according to claim 6, characterized in that: The air intake pipe (201) is connected to the end cavity via the air intake hole (9), and the other end of the air intake pipe (201) is connected to the compressed air chamber at the rear end of the engine; The air inlet hole (9) penetrates the motor housing (2) and the air inlet cone (102); The oil inlet hole (107) and the oil outlet hole (108) penetrate the air intake cone (102).

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