High power density hybrid flux underwater thruster

Abstract

The application discloses a high-power-density mixed magnetic flux underwater propeller, which comprises a shell assembly, a stator assembly, a rotor assembly and a bearing assembly. The stator assembly comprises an integral stator core, a plurality of axial windings and radial windings. The rotor assembly comprises a rotor yoke, an axial permanent magnet group and a radial permanent magnet group. The axial permanent magnet group is arranged opposite to the axial windings, and the radial permanent magnet group is arranged opposite to the radial windings. The inner circle surface of the rotor yoke is spaced apart and distributed with a plurality of blades. The bearing assembly connects the rotor assembly and the shell assembly. The rotor assembly and the stator assembly move under the composite driving of the axial magnetic field and the radial magnetic field, the rotation of the rotor assembly realizes the direct rotation of the blades, and the function of the mixed magnetic flux shaftless rim propeller is realized. The rotor yoke is an integral structure, which can meet the requirements of the axial rotor and the radial rotor, the size of the thrust of the underwater propeller can be flexibly adjusted, the space of the shell assembly is reasonably and effectively utilized, and the power density of the underwater propeller is improved.

Description

Technical Field

[0001] This invention relates to the field of propulsion technology, and in particular to a high power density hybrid magnetic flux underwater propulsion device. Background Technology

[0002] Underwater vehicles, ships, and other transportation tools are equipped with underwater propulsion systems. Among these, high-performance underwater robots and vehicles place increasingly higher demands on the power density, lightweight design, and compactness of their underwater propulsion systems. Underwater propulsion systems typically use an electric motor to drive a propeller, allowing the vehicle to travel at different speeds by manipulating the propeller. The connection between the electric motor and the propeller is usually a gear mechanism for power transmission. This structure not only adds the gear mechanism as a transfer mechanism but also increases the overall structural complexity of the underwater propulsion system.

[0003] To simplify the structure of underwater propulsion devices, Chinese patent CN 111641308 A discloses a ring-shaped electric propulsion device driven by an axial flux motor, comprising: a housing, an axial flux motor, a propeller, and a bearing assembly. This ring-shaped electric propulsion device uses an axial flux motor placed in the water to directly drive the propeller, eliminating the need for intermediate transmission equipment. The rotor and propeller assembly are supported by bearings placed in the water, which transmit thrust to the motor and the hull.

[0004] Chinese patent CN202011476046.2 discloses a rim-mounted underwater propulsion device, comprising a front guide vane, a front fairing, a housing, a rear fairing, a stator winding, a rotor magnet, a rotor sleeve, and a propeller. The front guide vane and rear fairing are connected to the front and rear ends of the housing, respectively, with the front fairing positioned on the outer side of the front guide vane. The stator winding is located on the inner wall of the housing. The propeller is housed within the housing and rotatably mounted on the front guide vane. The rotor sleeve is fitted onto the propeller, and the rotor magnet is positioned on the outer side of the rotor sleeve, corresponding to the stator winding. This invention employs a rim-mounted motor structure, where the motor rotor directly drives the propeller to rotate and generate thrust. The transmission chain is short, and the structure is compact. The motor stator is encapsulated, and a through-hull component is used to guide the stator winding leads into the dry compartment within the hollow part of the guide vane. All-ceramic rolling bearings are used, ensuring the propulsion device can operate efficiently and for extended periods in underwater environments.

[0005] The aforementioned thrusters employ a rotor layout with separate axial and radial magnetic field drives, resulting in a single-direction magnetic field. This leads to technical issues such as low thrust and low power density, necessitating further improvements. Summary of the Invention

[0006] To address the shortcomings of the existing technology, the purpose of this invention is to provide a high power density hybrid magnetic flux underwater propulsion device.

[0007] To achieve the above objectives, the technical solution adopted by this invention is as follows: This invention discloses a high power density hybrid magnetic flux underwater propulsion device, comprising:

[0008] Housing assembly, the housing assembly being annular;

[0009] A stator assembly fixedly connected to the housing assembly, the stator assembly including an integral stator core, a plurality of axial windings and radial windings assembled on the stator core, the axial windings being distributed along the axial direction of the stator core, and the radial windings being distributed along the radial direction of the stator core;

[0010] The rotor assembly includes a rotor yoke, an axial permanent magnet group and a radial permanent magnet group mounted on the rotor yoke, wherein the axial permanent magnet group is disposed opposite to the axial winding, the radial permanent magnet group is disposed opposite to the radial winding, and multiple blades are distributed at intervals on the inner ring surface of the rotor yoke.

[0011] A bearing assembly that connects the rotor assembly and the housing assembly.

[0012] In one embodiment, the rotor yoke includes an annular magnetic yoke body, the blades protruding from the inner ring surface of the magnetic yoke body at intervals, the magnetic yoke body having a groove formed by a recess in the outer ring surface, the radial permanent magnet group being distributed along the bottom wall of the magnetic yoke groove, the axial permanent magnet group being distributed along the groove wall of the magnetic yoke groove, and at least a portion of the stator assembly extending into the magnetic yoke groove.

[0013] In one embodiment, the axial permanent magnet assembly is symmetrically arranged on opposite sides of the magnetic yoke groove.

[0014] In one embodiment, the axial permanent magnet assembly includes a plurality of axial permanent magnets uniformly distributed in the yoke groove, wherein the number of axial permanent magnets distributed on the groove wall of each side of the yoke groove is 2P, where P is an integer, to form an axial magnetic field with a pole pair number of P.

[0015] In one embodiment, the radial permanent magnet group includes a plurality of radial permanent magnets, the number of which is equal to the number of axial permanent magnets distributed on the groove wall of each side of the magnetic yoke groove, so as to form a radial magnetic field with a pole pair number of P.

[0016] In one embodiment, the axial windings are distributed on two opposite sides of the stator core.

[0017] In one embodiment, the two sides of the stator core are partially protruded along the axial direction to form a plurality of axial bosses, and each axial winding is wound with a corresponding axial boss.

[0018] In one embodiment, the stator core includes a through-hole partition groove, the opening of which extends to intersect the inner circular surface of the stator core, and a radial boss is formed between two adjacent partition grooves, with each radial boss corresponding to the radial winding.

[0019] In one embodiment, a plurality of uniformly distributed blades constitute a hubless propeller.

[0020] In one embodiment, the axial winding and the radial winding are respectively in the form of concentrated windings, and the axial winding and the radial winding are connected in series or in parallel.

[0021] The rotor assembly and stator assembly of this invention move under the combined drive of axial and radial magnetic fields. The rotation of the rotor assembly directly rotates the propeller blades, realizing the function of a mixed flux shaftless rim propulsion device. The rotor yoke is an integral structure that meets both axial and radial rotor requirements, allowing for flexible adjustment of the underwater propulsion force, efficient use of the space in the shell assembly, and improved power density of the underwater propulsion device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the underwater thruster of the present invention;

[0024] Figure 2 This is a cross-sectional structural schematic diagram of the underwater thruster of the present invention;

[0025] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0026] Figure 4 This is an exploded structural diagram of the underwater thruster of the present invention;

[0027] Figure 5 This is a schematic diagram of the stator assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of the rotor assembly of the present invention;

[0029] In the figure: 10, housing assembly; 11, housing; 12, first shroud; 13, second shroud; 14, guide surface; 20, rotor assembly; 21, rotor yoke; 211, first axial rotor yoke; 212, second axial rotor yoke; 213, magnetic yoke slot; 214, magnetic yoke; 215, radial rotor yoke; 22, axial permanent magnet assembly; 221, axial permanent magnet; 23, radial permanent magnet assembly; 231, radial permanent magnet; 24, blade; 30, stator assembly; 31, stator core; 311, axial boss; 312, partition slot; 313, radial boss; 314, lateral boss; 32, axial winding; 33, radial winding; 40, bearing assembly. Detailed Implementation

[0030] To facilitate understanding of the present invention, it will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to make the disclosure of the present invention more thorough and complete.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments or examples only and is not intended to limit the invention. The optional scope of the term "and / or" as used herein includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all related listed items.

[0032] See Figures 1 to 4 As shown: This invention discloses a high-power-density hybrid flux underwater thruster. The underwater thruster includes a housing assembly 10, a rotor assembly 20, a stator assembly 30, and a bearing assembly 40. The stator assembly 30 is fixedly connected to the housing assembly 10, and the bearing assembly 40 connects the rotor assembly 20 and the housing assembly 10. During operation of the underwater thruster, the rotor assembly 20 rotates relative to the stator assembly 30, and the rotor assembly 20 and the housing assembly 10 are movably connected via the bearing assembly 40. Preferably, the bearing assembly 40 is a water-lubricated bearing to maintain a small gap between the rotor assembly 20 and the housing assembly 10, ensuring good rotational flexibility in the underwater environment.

[0033] The housing assembly 10 has a ring-shaped structure. The stator assembly 30 is located inside the housing assembly 10, and the rotor assembly 20 is located in the inner ring of the housing assembly 10 and extends into the housing assembly 10. The rotor assembly 20 and the stator assembly 30 are magnetically induced by each other. In this application, the axial direction is defined as the axial direction of the housing assembly 10, and the radial direction is defined as the radial direction of the housing assembly 10.

[0034] Optionally, the housing assembly 10 includes a housing 11, a first guide shield 12 and a second guide shield 13 mounted on both sides of the housing 11, forming an accommodating space between the first guide shield 12, the housing 11 and the second guide shield 13. The stator assembly 30 is fixed to the housing 11 and located within the accommodating space. The axial sides of the rotor assembly 20 are movably connected to the first guide shield 12 and the second guide shield 13 via bearing assemblies 40. Optionally, the first guide shield 12 and the second guide shield 13 have a flow-guiding surface 14 that is recessed from the edge to the center. The flow-guiding surface 14 guides the flow of fluid during the operation of the underwater thruster, reducing flow channel losses.

[0035] The stator assembly 30 includes a single-piece stator core 31, and multiple axial windings 32 and radial windings 33 assembled on the stator core 31. The axial windings 32 are distributed along the axial direction of the stator core 31, and the radial windings 33 are distributed along the radial direction of the stator core 31. The stator core 31 is a single-piece structure, with the axial windings 32 distributed along the axial direction of the stator core 31 to form axial magnetic flux. The radial windings 33 are distributed in the radial direction of the stator core 31 to form radial magnetic flux. The axial and radial magnetic fluxes share the same stator core 31, achieving a unified axial and radial stator, effectively saving space in the stator assembly 30.

[0036] See Figures 3 to 6 As shown, the rotor assembly 20 includes a rotor yoke 21, an axial permanent magnet assembly 22 and a radial permanent magnet assembly 23 mounted on the rotor yoke 21. The axial permanent magnet assembly 22 is arranged opposite to the axial winding 32, and the radial permanent magnet assembly 23 is arranged opposite to the radial winding 33. Both the axial permanent magnet assembly 22 and the radial permanent magnet assembly 23 consist of multiple permanent magnets. The axial magnetic flux generated by the axial permanent magnet assembly 22 and the axial winding 32 mutually induces each other to form an axial magnetic flux disk drive mechanism. The radial magnetic flux generated by the radial permanent magnet assembly 23 and the radial winding 33 mutually induces each other to form a radial magnetic flux rotary drive mechanism. This axial magnetic flux disk drive mechanism and the radial magnetic flux rotary drive mechanism share a single stator core 31, forming a hybrid magnetic flux drive mechanism. The stator assembly 30 has a compact structure, short axial dimension, and large output thrust.

[0037] The rotor yoke 21 has multiple blades 24 spaced apart on its inner surface, with each blade extending towards the center in a curved manner to form a propeller structure. Optionally, the evenly distributed blades 24 form a hubless propeller. Two sets of axial permanent magnet groups 22 and radial permanent magnet groups 23 are connected to the rotor yoke 21 and drive the hubless propeller to rotate. The output torque of the rotor assembly 20 is directly converted into the thrust of the propeller, forming a synchronously rotating shaftless rim propeller. The blades 24 are driven by a hybrid flux drive mechanism, resulting in a small overall axial dimension, high output thrust, and high power density.

[0038] In one embodiment, the rotor yoke 21 includes an annular magnetic yoke body 214, with blades 24 protruding from the inner surface of the magnetic yoke body 214 at intervals. The magnetic yoke body 214 is located within the housing assembly 10, and magnetic yoke grooves 213 are formed by recesses in the outer surface of the magnetic yoke body 214. The magnetic yoke grooves 213 are groove structures distributed on the outer ring of the magnetic yoke body 214, with radial permanent magnet groups 23 distributed along the bottom wall of the magnetic yoke grooves 213 and axial permanent magnet groups 22 distributed along the groove walls of the magnetic yoke grooves 213. The axial permanent magnet groups 22 are distributed along one or both sides of the groove walls of the magnetic yoke grooves 213. Optionally, the axial permanent magnet groups 22 are symmetrically arranged on opposite sides of the groove walls of the magnetic yoke grooves 213 to form a dual-axial rotor structure, thereby further improving power density.

[0039] The stator core 31, equipped with axial windings 32 and radial windings 33, extends into the yoke slot 213. The axial windings 32 and the axial permanent magnet assembly 22 are arranged opposite each other, and their spacing and relative position are controllable. The radial windings 33 and the radial permanent magnet assembly 23 are arranged opposite each other, and their spacing and relative position are controllable. The stator core 31 and the yoke slot 213 form a complementary structure to facilitate control of the internal fitting space and reduce the axial and radial space dimensions.

[0040] In an optional embodiment, the rotor yoke 21 includes a radial rotor yoke 215, a first axial rotor yoke 211 fixed to the radial rotor yoke 215, and a second axial rotor yoke 212. The first axial rotor yoke 211 and the second axial rotor yoke 212 are arranged opposite to each other, and a magnetic yoke groove 213 is formed between the first axial rotor yoke 211, the radial rotor yoke 215, and the second axial rotor yoke 212. The first axial rotor yoke 211, the radial rotor yoke 215, and the second axial rotor yoke 212 are assembled and cooperated to facilitate the assembly of the radial permanent magnet assembly 23 and the axial permanent magnet assembly 22, as well as the adjustment of the air gap between the various components.

[0041] In one embodiment, the axial permanent magnet assembly 22 includes a plurality of axial permanent magnets 221 uniformly distributed in the yoke groove 213. The axial permanent magnets 221 are made of magnetic steel material and are evenly distributed around the groove wall. Optionally, the axial permanent magnets 221 are configured as a fan-shaped structure or a strip-shaped structure.

[0042] See Figures 3 to 6 As shown: the number of axial permanent magnets 221 distributed on the groove wall of each yoke groove 213 is 2P, where P is an integer, to form an axial magnetic field with a pole pair number of P. The number of axial permanent magnets 221 is an integer multiple of 2 to form an axial magnetic field with a pole number of P. The axial permanent magnets 221 on opposite sides of the groove wall have the same number of pole pairs, which can generate a magnetic field of the same frequency, improving the smoothness of the rotor assembly 20 rotation.

[0043] In one embodiment, the radial permanent magnet assembly 23 includes a plurality of radial permanent magnets 231. The number of radial permanent magnets 231 is equal to the number of axial permanent magnets 221 distributed on the groove wall of each side yoke groove 213, so as to form a radial magnetic field with a pole pair number of P. The number of pole pairs of the axial permanent magnets 221 is the same as the number of pole pairs of the radial permanent magnet assembly 23, so as to generate a magnetic field of the same frequency and maintain a high power density.

[0044] The stator core 31 extends into the magnetic yoke slot 213, and the axial windings 32 are distributed on the two opposite sides of the stator core 31, with the axial windings 32 positioned opposite to the axial permanent magnets 221. The number of axial windings 32 is 3m, where m is an integer, forming an m-phase winding. The interaction between the axial windings 32 and the axial permanent magnet group 22 generates an axial rotating magnetic field, thereby driving the rotor assembly 20 to rotate.

[0045] Based on the same principle, the number of radial windings 33 is 3m, where m is an integer, and the radial windings 33 form an m-phase winding. The radial windings 33 and the radial permanent magnet group 23 interact to form a radial rotating magnetic field, thereby driving the rotor assembly 20 to rotate.

[0046] The axial winding 32 is assembled on the stator core 31. Optionally, multiple axial bosses 311 are formed by partial axial protrusions on both sides of the stator core 31, and each axial winding 32 is wound around a corresponding axial boss 311. The axial bosses 311 protrude along the axial direction of the stator core 31, and the axial winding 32 is wound around the outer peripheral wall of the axial bosses 311. By adjusting the protruding parts of the axial bosses 311, the winding position and magnetic field range of the axial winding 32 can be adjusted. Optionally, the shape of the axial winding 32 is the same as the shape of the axial bosses 311, thereby changing the magnetic field region. For example, the axial bosses 311 have various shapes such as cylindrical, rectangular, trapezoidal, or fan-shaped cross-sections, and the shape of the axial winding 32 is basically the same as the shape of the axial bosses 311, which can generate a larger axial magnetic flux.

[0047] In one embodiment, the stator core 31 includes a through-hole partition groove 312, the opening of which extends and intersects the inner circular surface of the stator core 31. A radial boss 313 is formed between two adjacent partition grooves 312, and each radial boss 313 corresponds to a radial winding 33. The radial winding 33 is wound on the radial boss 313, and at least part of the radial winding 33 is located within the partition groove 312. The radial boss 313 is part of the stator core 31, resulting in good magnetic flux. The partition groove 312 can accommodate part of the radial winding 33 while maintaining the independence of adjacent radial windings 33, resulting in a reasonable spatial layout and the generation of stable radial magnetic flux.

[0048] Optionally, the end of the radial boss 313 protrudes partially towards the adjacent radial boss 313 to form a lateral boss 314, and a mating gap is formed between the lateral bosses 314 of two adjacent radial bosses 313. The radial bosses 313 and the lateral bosses 314 form an approximately "T"-shaped structure to limit the winding range of the radial winding 33 and prevent the radial winding 33 from detaching from the radial bosses 313. The end cross-sectional size of the radial boss 313 is large, resulting in a large induction area between it and the radial permanent magnet 231, thereby generating a larger thrust.

[0049] In the above embodiments, the axial winding 32 and the radial winding 33 are respectively in the form of concentrated windings.

[0050] Optionally, the axial winding 32 and the radial winding 33 are connected in series or in parallel. The axial winding 32 and the radial winding 33 can be connected in series or in parallel to form a hybrid flux drive mechanism, where both drive the propeller rotation, resulting in a large thrust. Optionally, the axial winding 32 and the radial winding 33 can operate relatively independently, depending on the current underwater propulsion configuration, to improve energy efficiency. In this configuration, one winding of the axial winding 32 and the other of the radial winding 33 can form a motor winding, while the other forms a generator winding, used for energy recovery from ocean currents during deceleration and hovering, thus improving endurance.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high power density hybrid flux underwater propulsion device, characterized in that, include: Housing assembly, the housing assembly being annular; A stator assembly is fixedly connected to the housing assembly. The stator assembly includes an integral stator core, a plurality of axial windings and radial windings assembled on the stator core. The axial windings are distributed along the axial direction of the stator core, and the radial windings are distributed along the radial direction of the stator core. The axial windings and the radial windings are relatively independent and can operate independently. One of the axial windings and the radial windings constitutes a motor winding, and the other winding constitutes a generator winding. The rotor assembly includes a rotor yoke, an axial permanent magnet group and a radial permanent magnet group mounted on the rotor yoke, wherein the axial permanent magnet group is disposed opposite to the axial winding, the radial permanent magnet group is disposed opposite to the radial winding, and multiple blades are distributed at intervals on the inner ring surface of the rotor yoke. A bearing assembly that connects the rotor assembly and the housing assembly.

2. The high power density hybrid magnetic flux underwater thruster according to claim 1, characterized in that, The rotor yoke includes an annular magnetic yoke body, the blades protruding from the inner ring surface of the magnetic yoke body at intervals, the magnetic yoke body forming a magnetic yoke groove from the outer ring surface, the radial permanent magnet group distributed along the bottom wall of the magnetic yoke groove, the axial permanent magnet group distributed along the groove wall of the magnetic yoke groove, and at least a portion of the stator assembly extending into the magnetic yoke groove.

3. The high power density hybrid magnetic flux underwater thruster according to claim 2, characterized in that, The axial permanent magnet groups are symmetrically arranged on the opposite two sides of the magnetic yoke groove.

4. The high power density hybrid flux underwater thruster according to claim 3, characterized in that, The axial permanent magnet assembly includes a plurality of axial permanent magnets uniformly distributed in the yoke groove. The number of axial permanent magnets distributed on the groove wall of each side of the yoke groove is 2P, where P is an integer, to form an axial magnetic field with a pole pair number of P.

5. The high power density hybrid flux underwater thruster according to claim 4, characterized in that, The radial permanent magnet assembly includes multiple radial permanent magnets, the number of which is equal to the number of axial permanent magnets distributed on the groove wall of each side of the magnetic yoke groove, so as to form a radial magnetic field with a pole pair number of P.

6. The high power density hybrid flux underwater thruster according to claim 1, characterized in that, The axial windings are distributed on the two opposite sides of the stator core.

7. The high power density hybrid flux underwater thruster according to claim 6, characterized in that, The two sides of the stator core protrude axially to form multiple axial bosses, and each axial winding is wound with a corresponding axial boss.

8. The high power density hybrid flux underwater thruster according to claim 1, characterized in that, The stator core includes a through-hole partition groove, the opening of which extends to intersect the inner circular surface of the stator core, and a radial boss is formed between two adjacent partition grooves. Each radial boss corresponds to the radial winding.

9. The high power density hybrid flux underwater thruster according to any one of claims 1 to 8, characterized in that, The hubless propeller is composed of multiple evenly distributed blades.

10. The high power density hybrid flux underwater thruster according to any one of claims 1 to 8, characterized in that, The axial winding and radial winding are respectively in the form of concentrated windings, and the axial winding and radial winding are connected in series or in parallel.

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