A shaftless rim propeller with axial magnetic flux

Abstract

The present invention discloses an axial flux shaftless rim propeller, comprising a casing, a rotor and two annular stators, wherein the rotor is located inside the casing, the rotor and the casing are connected by a water-lubricated radial bearing, the two annular stators are arranged on both sides of the rotor, and water-lubricated thrust bearings are respectively arranged between the annular stators and the rotor. The shaftless rim propeller reduces the axial size and balances the axial magnetic pull. Compared with the radial flux shaftless rim propeller, it can provide a greater torque output under the same volume, and improves the output power of the motor. In addition, the shaftless motor structure reduces the axial size of the ship propeller, provides ample space for the arrangement of the thrust bearing, significantly reduces friction and wear, reduces noise, effectively improves the performance of the motor, prolongs the life of the motor, and further improves the operating stability and efficiency of the motor.

Description

Technical Field

[0001] The invention relates to a ship propeller, in particular to a shaftless rim propeller. Background Art

[0002] Traditional ship propulsion devices use a combination of propulsion shafting and propellers. The propeller of a traditional shafting propulsion device is connected to a shaft that protrudes from the rear of the ship to the range of the prime mover located inside the hull, taking up a lot of space. The existence of the shaft not only causes huge friction losses, but also increases the size of the ship, thereby increasing construction costs, and is accompanied by noise and vibration problems, reducing propulsion efficiency and reliability.

[0003] Integrated motor propellers integrate propellers into electric motors, which have the advantages of low noise, small size, and high reliability, overcoming the shortcomings of traditional ship propulsion devices. Integrated motor propellers are divided into shafted and shaftless rims. The support of the propeller hub of the shafted rim propeller can provide higher stress support for the blades, so a larger propeller diameter can be designed to provide greater thrust. However, since there is a shaft in the center of the rotor propeller, it affects the water flow and reduces the fluid dynamics efficiency.

[0004] The shaftless rim thruster realizes the integration of motor and propeller. Its device structure is simple and compact. It adopts direct drive design, omitting the rotating shaft and its related bearings in the traditional motor, reducing mechanical loss and improving the efficiency of output power. However, the propeller diameter is limited by the rotor diameter. Compared with the traditional propeller thruster, the shaftless rim thruster has lower thrust and cannot meet the propulsion needs of larger ships. Summary of the invention

[0005] Purpose of the invention: In view of the above-mentioned prior art, an axial flux shaftless rim propeller is proposed, which can provide greater torque output under the same volume and improve the output power of the motor compared with the radial flux shaftless rim propeller.

[0006] Technical solution: An axial flux shaftless rim thruster comprises a casing, a rotor and two annular stators;

[0007] The rotor comprises a rotor waterproof housing, a rotor yoke, fourteen T-shaped rotor teeth, and fourteen T-shaped rotor tooth pressing blocks; the T-shaped rotor teeth are fixed on the outer circumference of the annular rotor yoke through the T-shaped rotor tooth pressing blocks, and the inner ring of the rotor yoke is provided with a plurality of propeller blades facing inward; the rotor waterproof housing is covered on the outside of the rotor yoke, and completely covers the rotor teeth and the T-shaped rotor tooth pressing blocks;

[0008] The rotor is located inside the casing, and the rotor and the casing are connected via a water-lubricated radial bearing. Two annular stators are arranged on both sides of the rotor, and water-lubricated thrust bearings are respectively arranged between the annular stator and the rotor.

[0009] Furthermore, the annular stator includes a stator base, six E-type stator cores, six permanent magnets, a stator winding and a stator sealing ring; wherein the stator base is a circular ring structure, six stator slot wedges are arranged on the stator base at intervals along the circumferential direction, and the E-type stator cores are respectively embedded between adjacent stator slot wedges, each permanent magnet is installed on the stator slot wedge, and the magnetization directions of two adjacent permanent magnets are opposite; the stator winding is wound on the E-type stator core and the permanent magnet; the circular stator sealing ring covers the stator base to seal the E-type stator core, the permanent magnet and the stator winding in the stator base.

[0010] Furthermore, the inner ring of the water-lubricated radial bearing is adapted to the rotor waterproof housing outside the rotor.

[0011] Furthermore, in the annular stator, the top of the permanent magnet is flush with the top of the E-shaped iron core.

[0012] Furthermore, the magnetization directions of the permanent magnets of the left and right annular stators are opposite to each other.

[0013] Furthermore, the casing is provided with a water hole for providing a water source for the water-lubricated thrust bearing and the water-lubricated radial bearing, and a filter is provided in the water hole.

[0014] Furthermore, the bases of the two water-lubricated thrust bearings are respectively clamped on the two supporting rings in the casing.

[0015] Beneficial effects: The present invention adopts the structure of an axial magnetic field shaftless motor with double stators and single rotor. Both the annular stator and the rotor adopt a double salient pole structure. A double air gap structure is formed between the rotor and the left and right annular stators. The axial magnetic field direction is formed through the left annular stator-left air gap-rotor teeth-right air gap-right annular stator. As the motor rotor rotates, the size and direction of the magnetic flux (magnetic flux) of the turn chain in the stator winding change periodically, thereby generating an alternating induced potential in the motor stator armature winding. It overcomes the disadvantages of the single air gap structure of a single stator / single rotor, balances the axial magnetic pull, and can provide greater torque output at the same volume compared to radial flux shaftless rim thrusters, thereby increasing the output power of the motor.

[0016] In addition, the shaftless motor structure reduces the axial size of the ship's propeller, provides ample space for the arrangement of thrust bearings, significantly reduces friction and wear, reduces noise, effectively improves the performance of the motor, extends the life of the motor, and further improves the operating stability and efficiency of the motor.

[0017] The axial flux shaftless rim propeller of the present invention realizes the integrated integration of the motor and the propeller, and the device has a simple and compact structure, a small size and flexible installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a stereogram of the present invention;

[0019] Figure 2 It is an overall exploded view of the present invention;

[0020] Figure 3 is an exploded view of the stator of the present invention;

[0021] Figure 4 is an exploded view of the rotor of the present invention;

[0022] Figure 5 This is an exploded view of the internal structure of the rotor of the present invention;

[0023] Figure 6 It is a partial structural view of the present invention;

[0024] Figure 7 is a cross-sectional view of the present invention;

[0025] The figures are marked as follows: 1-shaftless rim propeller, 2-electric wire, 3-annular stator, 4-statator base, 5-statator slot wedge, 6-E-type stator core, 7-permanent magnet, 8-stator winding, 9-stator sealing ring, 10-water-lubricated thrust bearing, 11-base, 12-water hole, 13-support ring, 14-casing, 15-ship connecting part, 16-water-lubricated radial bearing, 17-rotor, 18-rotor waterproof shell, 19-T-type rotor teeth, 20-T-type rotor tooth pressure block, 21-propeller blade, 22-rotor yoke, 23-filter screen. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with the accompanying drawings.

[0027] This embodiment provides an axial flux shaftless rim propeller, such as Figure 1 , Figure 2 As shown, the overall structure of the shaftless rim propeller 1 includes a casing 14, a rotor 17 and an annular stator 3, wherein both the annular stator 3 and the rotor 17 adopt a double salient pole structure.

[0028] like Figure 3As shown, the annular stator 3 is composed of a stator base 4, six E-type stator cores 6, six permanent magnets 7, a stator winding 8 and a stator sealing ring 9. The stator base 4 is a circular ring structure, and six stator slot wedges 5 are arranged at intervals along the circumferential direction on the stator base 4. A single E-type stator core 6 is fixed by being clamped between two stator slot wedges 5. Each permanent magnet 7 is installed on the stator slot wedge 5, that is, a permanent magnet 7 is arranged between adjacent E-type stator cores 6 in the circumferential direction, the top of the permanent magnet 7 is flush with the top of the E-type core 6, and the magnetization directions of two adjacent permanent magnets 7 are opposite. The stator winding 8 is wound on the E-type stator core 6 and the permanent magnet 7, and is connected to the outside of the annular stator 3 through the wire 2. The annular stator sealing ring 9 covers the stator base 4, and seals the E-type stator core 6, the permanent magnet 7, and the stator winding 8 in the stator base 4.

[0029] like Figure 4 , Figure 5 As shown, the rotor 17 is composed of a rotor waterproof shell 18, a rotor yoke 22, fourteen T-shaped rotor teeth 19, and fourteen T-shaped rotor tooth pressing blocks 20. The fourteen T-shaped rotor teeth 19 are fixed to the outer circumference of the annular rotor yoke 22 by fixing screws and the T-shaped rotor tooth pressing blocks 20, and two adjacent T-shaped rotor teeth 19 are fixed by a T-shaped rotor tooth pressing block 20. The T-shaped rotor teeth 19 are stacked by silicon steel sheets with good magnetic conductivity. The inner ring of the rotor yoke 22 is equipped with a plurality of propeller blades 21 facing inward. The rotor waterproof shell 18 is coated on the outside of the rotor yoke 22, completely covering the rotor teeth 19 and the T-shaped rotor tooth pressing blocks 20. The remaining gaps inside the rotor waterproof shell 18 are filled with waterproof lightweight materials. The rotor waterproof shell 18 plays the role of waterproofing and grinding ring.

[0030] like Figure 1 , Figure 2 , Figure 6 , Figure 7 As shown, in the overall structure, the rotor 17 is located inside the housing 14, and the rotor 17 is connected to the housing 14 through a water-lubricated radial bearing 16. Two annular stators 3 are arranged on both sides of the rotor 17, and water-lubricated thrust bearings 10 are respectively arranged between the annular stators 3 and the rotor 17. The water inlets in the center of the annular stators 3 on both sides of the housing 14 are used for water inlet and outlet. The permanent magnets 7 of the left and right annular stators 3 are magnetized in opposite directions.

[0031] The inner ring of the water-lubricated radial bearing 16 is adapted to the rotor waterproof housing 18 outside the rotor 17. The water-lubricated thrust bearings 10 on both sides of the rotor 17 are used to constrain the radial movement of the rotor 17, and the bases 11 of the two water-lubricated thrust bearings 10 are respectively clamped on the two support rings 13 in the housing 14.

[0032] In some embodiments, the water-lubricated thrust bearing 10 and the water-lubricated radial bearing 16 are made of sliding bearings made of rubber, plastic, engineering ceramics, ironwood, graphite, metal-plastic composite materials, etc., which have good compatibility with the lubricating effect of water and can be used as water-lubricated friction materials.

[0033] The housing 14 is also provided with a water hole 12 for providing a water source for lubricating the water-lubricated radial bearing 16. A filter screen 23 is provided in the water hole 12 for preventing sediment particles, algae and the like from entering the shaftless rim propeller.

[0034] A ship connection piece 15 is also provided on the outside of the casing 14 for connecting the shaftless rim propeller 1 to the ship.

[0035] The working principle of the present invention is as follows: when the shaftless rim propeller is working, the annular stator 3 is powered by the wire 2, the stator winding 8 generates a magnetic field to drive the entire rotor 17 to rotate so that the propeller blades 21 rotate synchronously, and the propeller blades 21 are used to generate thrust to drive the ship forward. Since the water-lubricated thrust bearing 10 cooperates with the rotor 17, the axial movement of the rotor 17 can be constrained, and the water-lubricated radial bearing 16 cooperates with the outer surface of the rotor 17 to constrain the radial movement of the rotor 17. There is a water hole 12 inside the housing 10, which can control the inflow and outflow of water and ensure the normal operation of the water-lubricated radial bearing 16.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An axial flux shaftless rim propeller, characterized in that: It comprises a housing (14), a rotor (17) and two annular stators (3); The rotor (17) comprises a rotor waterproof housing (18), a rotor yoke (22), fourteen T-shaped rotor teeth (19), and fourteen T-shaped rotor tooth pressing blocks (20); the T-shaped rotor teeth (19) are fixed to the outer circumference of the annular rotor yoke (22) via the T-shaped rotor tooth pressing blocks (20), and the inner ring of the rotor yoke (22) is provided with a plurality of propeller blades (21) facing inward; the rotor waterproof housing (18) is covered on the outside of the rotor yoke (22), and completely covers the rotor teeth (19) and the T-shaped rotor tooth pressing blocks (20); The rotor (17) is located inside the casing (14); the rotor (17) and the casing (14) are connected via a water-lubricated radial bearing (16); two annular stators (3) are disposed on both sides of the rotor (17); and water-lubricated thrust bearings (10) are respectively disposed between the annular stators (3) and the rotor (17); The annular stator (3) comprises a stator base (4), six E-shaped stator cores (6), six permanent magnets (7), a stator winding (8) and a stator sealing ring (9); wherein the stator base (4) is a circular ring structure, six stator slot wedges (5) are arranged on the stator base (4) at intervals in the circumferential direction, the E-shaped stator cores (6) are respectively embedded between adjacent stator slot wedges (5), each permanent magnet (7) is mounted on the stator slot wedge (5), and the spacing between two adjacent permanent magnets (7) is The magnetization directions are opposite; the stator winding (8) is wound on the E-type stator core (6) and the permanent magnet (7); the annular stator sealing ring (9) covers the stator base (4) to seal the E-type stator core (6), the permanent magnet (7) and the stator winding (8) in the stator base (4); in the annular stator (3), the top of the permanent magnet (7) is flush with the top of the E-type stator core (6); the magnetization directions of the permanent magnets (7) facing each other in the left and right annular stators (3) are opposite.

2. The axial flux shaftless rim propeller according to claim 1, characterized in that: The inner ring of the water-lubricated radial bearing (16) is adapted to a rotor waterproof housing (18) outside the rotor (17).

3. The axial flux shaftless rim propeller according to claim 1 or 2, characterized in that: The housing (14) is also provided with a water hole (12) for providing a water source for the water-lubricated thrust bearing (10) and the water-lubricated radial bearing (16), and a filter screen (23) is provided in the water hole (12).

4. The axial flux shaftless rim propeller according to claim 2, characterized in that: The bases (11) of the two water-lubricated thrust bearings (10) are respectively clamped on the two support rings (13) in the casing (14).

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