A propeller based on a flux-switching permanent magnet motor

Abstract

The application discloses a kind of based on magnetic flux switching permanent magnet motor's no oar shaft type rim propeller in ship propulsion technical field, including external guide pipe, magnetic flux switching permanent magnet motor stator, magnetic flux switching permanent magnet motor rotor, embedded paddle, rotor cover plate, water-lubricated thrust bearing and stator insulation waterproof sheath;The magnetic flux switching permanent magnet motor stator includes circumferentially distributed modular stator core, modular stator permanent magnet and stator winding.The magnetic flux switching permanent magnet motor stator in the application adopts modular structure, the number of stages of magnetic flux switching permanent magnet motor stator, magnetic flux switching permanent magnet motor rotor can change;Higher integrity and stability;Modular permanent magnet can be designed axial section, rotor cover plate can be designed flow channel to provide heat dissipation for rotor, stator insulation waterproof sheath plays the role of insulation waterproof and heat conduction;Magnetic flux switching permanent magnet motor rotor is simple structure silicon steel sheet, can be applicable to high-speed place, and maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ship propulsion, and particularly relates to a propellerless shaft type rim propeller based on a flux switching permanent magnet motor. BACKGROUND

[0002] In recent years, with the expansion of shipping trade between countries, the demand for tonnage and propulsion power of ships is increasing, and the size and strength of the main engine and its components are also increasing. The design of the propulsion shafting structure is complex, which reduces the space utilization of the ship, increases energy loss, reduces propulsion efficiency, and brings more shafting vibration and noise hazards. Based on this, the concept of propellerless rim propeller is generated. It integrates the motor rotor and the propeller into one, uses electric power to directly transmit power, increases the space utilization of the ship, reduces vibration and noise, and is very suitable for applications such as torpedoes, submarines, warships and other limited space and high concealment requirements. According to the structural characteristics of the propellerless rim propeller, it is mainly divided into propeller shaft type and propellerless shaft type. The propeller shaft type rim propeller developed initially occupies a considerable part of the flow area inside the guide pipe due to the support of the propeller hub, so its propulsion efficiency is low. With the continuous development of technology, the propellerless shaft type rim propeller is developed, which places the propeller support structure inside the guide pipe, increasing the flow area and propulsion efficiency inside the guide pipe.

[0003] The reliable operation of the propellerless rim propeller is a hot issue for researchers in the field, and the existing built-in integrated motor of the rim propeller mainly includes brushless DC motor, permanent magnet synchronous motor and permanent magnet fault-tolerant motor. Its structural characteristics are that the permanent magnet is arranged on the motor rotor part and rotates with the rotor. In some cooling structures, the permanent magnet is directly cooled by seawater, which greatly reduces the reliability of the motor operation and the service life of the permanent magnet, increasing the maintenance cost of the propulsion motor. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a propellerless shaft type rim propeller based on a flux switching permanent magnet motor to solve the problems raised in the background art.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A propellerless shaft type rim propeller based on a flux switching permanent magnet motor, comprising an external guide pipe, a flux switching permanent magnet motor stator, a flux switching permanent magnet motor rotor, an embedded propeller, a rotor cover plate, a water lubricated thrust bearing and a stator insulation waterproof sheath.

[0007] The external conduit is sleeved outside the flux switching permanent magnet motor stator, the flux switching permanent magnet motor rotor is installed inside the flux switching permanent magnet motor stator, the embedded paddle is embedded inside the flux switching permanent magnet motor rotor, the rotor cover plate is installed on both sides of the flux switching permanent magnet motor rotor and the embedded paddle, the water lubricated thrust bearing is arranged outside the rotor cover plate, the water lubricated thrust bearing is connected with the external conduit, the stator insulation waterproof sheath is arranged at the air gap between the flux switching permanent magnet motor stator and the flux switching permanent magnet motor rotor, and the stator insulation waterproof sheath is closely attached to the flux switching permanent magnet motor stator.

[0008] The flux switching permanent magnet motor stator comprises a circumferentially distributed modular stator core, a modular stator permanent magnet and a stator winding, the modular permanent magnet is embedded with the modular stator core, and the stator winding is arranged inside the modular stator core slot.

[0009] Preferably, the radial dimension of the flux switching permanent magnet motor stator can change with the axial length of the motor, and the radial dimension of one end of the flux switching permanent magnet motor stator can be different from that of the other end.

[0010] Preferably, the radial dimension of the flux switching permanent magnet motor rotor can change with the axial length of the motor, and the radial dimension of one end of the flux switching permanent magnet motor rotor can be different from that of the other end.

[0011] Preferably, the flux switching permanent magnet motor rotor can adopt a skew pole structure and a rotor tooth filling material.

[0012] Preferably, the number of axial segments of the modular stator permanent magnet can be adjusted.

[0013] Preferably, the modular stator permanent magnet has protrusions on both sides, the modular stator core has grooves on both sides, and when the modular stator permanent magnet and the modular stator core are closed along the circumference, the protrusions of the modular stator permanent magnet are embedded in the grooves of the modular stator core.

[0014] Preferably, the stator winding is a concentrated winding, which is tightly wound on the flux switching permanent magnet motor stator through an insulation layer, the stator insulation waterproof sheath is a non-magnetic and good heat-conducting material, extends to the external conduit at both axial ends of the flux switching permanent magnet motor stator, and is closely attached to the end of the stator winding.

[0015] Preferably, the embedded paddle has a groove outside the outer skin, the flux switching permanent magnet motor rotor has a protrusion inside the yoke, and the protrusion of the flux switching permanent magnet motor rotor is embedded in the groove of the embedded paddle.

[0016] Preferably, the rotor cover plate can be provided with a fluid flow channel by being grooved to cool the flux switching permanent magnet motor rotor.

[0017] Preferably, the water-lubricated thrust bearing connects the rotor cover plate and the external conduit, supports the magnetic flux switching type permanent magnet motor rotor and the embedded paddle, and transmits the radial forward thrust and the radial backward thrust.

[0018] Advantages of the present application:

[0019] 1. The magnetic flux switching type permanent magnet motor stator in the present application adopts a modular structure, which is beneficial to processing and assembly, and can ensure a high stator slot fill rate. The modular permanent magnet is arranged at the magnetic flux switching type permanent magnet motor stator, the magnetic flux switching type permanent magnet motor stator has high integration, and the number of stages of the magnetic flux switching type permanent magnet motor stator and the magnetic flux switching type permanent magnet motor rotor can be changed, such as being designed into a horn shape to improve the hydrodynamic performance of the propeller.

[0020] 2. The modular permanent magnet and the modular stator in the present application are respectively provided with grooves and protrusions, and have high integrity and stability after being combined into an overall magnetic flux switching type permanent magnet motor stator. The inside of the magnetic flux switching type permanent magnet motor rotor and the outside of the embedded paddle are respectively provided with grooves and protrusions, and the rotor cover plate is additionally fixed, so that the magnetic flux switching type permanent magnet motor rotor and the embedded paddle have high stability.

[0021] 3. The modular permanent magnet in the present application can be designed to be axially segmented, the motor rotor tooth can be designed to have a skewed pole structure and a potting material, the rotor cover plate can be designed to have a flow channel to provide heat dissipation for the rotor, the stator insulation waterproof sheath plays an insulation waterproof role and provides heat dissipation in contact with the stator winding, and the electromagnetic performance of the propeller motor is high.

[0022] 4. The magnetic flux switching type permanent magnet motor rotor in the present application is a simple silicon steel sheet, which can be applied to high-speed places and is convenient to maintain. The stator permanent magnet is not affected by centrifugal force and does not contact the operating environment fluid, and the overall operation reliability of the propeller is high. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0024] Figure 1 is a structural schematic diagram of the propeller of the present application including an external conduit;

[0025] Figure 2 is a structural schematic diagram of the propeller of the present application not including an external conduit;

[0026] Figure 3 is an exploded structural schematic diagram of the propeller of the present application;

[0027] Figure 4 is a structural exploded front view of the propeller of the present application;

[0028] Figure 5 is a partial structural schematic view of the propeller of the present application;

[0029] Figure 6 is a partial structural exploded schematic view of the propeller of the present application;

[0030] Figure 7 is a structural schematic view of the stator of the flux-switching permanent magnet motor in the present application;

[0031] In the figure, 1 is an external conduit; 2 is a stator of a flux-switching permanent magnet motor; 201 is a modular stator core; 202 is a modular stator permanent magnet; 203 is a stator winding; 3 is a rotor of a flux-switching permanent magnet motor; 4 is an embedded blade; 5 is a rotor cover plate; 6 is a water-lubricated thrust bearing; 7 is a stator insulation waterproof sheath. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Please refer to Figures 1 to 7 , the present application proposes a propeller-free shaft type rim propeller based on a flux-switching permanent magnet motor, wherein, as Figures 1 to 4 shown, the propeller-free shaft type rim propeller includes an external conduit 1 of the rim propeller, a stator 2 of a flux-switching permanent magnet motor, a rotor 3 of a flux-switching permanent magnet motor, an embedded blade 4, a rotor cover plate 5, a water-lubricated thrust bearing 6, and a stator insulation waterproof sheath 7.

[0034] The external conduit 1 is sleeved on the outside of the stator 2 of the flux-switching permanent magnet motor, and the axial length thereof is longer than the axial length of the stator 2 of the flux-switching permanent magnet motor. The external conduit 1 can be designed to be horn-shaped according to the installation position of the propeller and the water dynamic performance requirements. In the external conduit 1, a water channel can be arranged according to the cooling needs. The water channel can adopt the prior art, and those skilled in the art can also design a water channel type with better cooling effect according to the actual structure and size of the conduit, according to the principles of fluid dynamics and fluid-solid coupling.

[0035] The rotor 3 of the flux-switching permanent magnet motor is made of silicon steel material, has a small tooth height, a thin yoke, and a hollow center connected with the embedded propeller 4. The rotor 3 can be designed into a horn shape according to the water dynamic performance requirements of the propeller and the electromagnetic performance requirements of the motor, so as to ensure the constant length of the air gap between the stator and the rotor of the propulsion motor, and the rotor tooth can be designed into a skew pole structure or the rotor slot is filled with high-thermal-conductivity and non-magnetic-conductivity material, so as to meet the coupling between the propulsion performance of the propeller and the electromagnetic performance of the motor.

[0036] The embedded propeller 4 is composed of an outer skin and an inner propeller blade. The propeller is a non-shaft propeller, and the blade is attached to the outer skin and connected to the yoke of the external flux-switching permanent magnet motor rotor 3. The inner propeller has a larger flow area and open water efficiency compared with the propeller with a shaft. The flux-switching permanent magnet motor rotor 3 and the embedded propeller 4 are fixed by the rotor cover plates 5 at the axial ends and are connected to the water-lubricated thrust bearing 6 in the axial direction. The water-lubricated thrust bearing 6 is connected to the external conduit 1, provides support for the flux-switching permanent magnet motor rotor 3 and the embedded propeller 4, and transmits the radial thrust. The rotor cover plates 5 can be slotted to set a fluid flow channel for cooling the flux-switching permanent magnet motor rotor 3.

[0037] The stator insulation waterproof sheath 7 is made of non-magnetic-conductivity and good-thermal-conductivity material, is arranged at the air gap between the stator and the rotor of the motor, closely adheres to the flux-switching permanent magnet motor stator 2, extends to the external conduit 1 at the axial ends of the flux-switching permanent magnet motor stator 2, plays an insulation waterproof role, and conducts the heat on the inner side of the flux-switching permanent magnet motor stator 2 to the cooling water channel of the external conduit 1.

[0038] As shown in Figure 5 , Figure 6 , the outer skin of the embedded propeller 4 has a groove, the yoke of the flux-switching permanent magnet motor rotor 3 has a protrusion, and the protrusion of the flux-switching permanent magnet motor rotor 3 is embedded in the groove of the embedded propeller 4, so that the propeller is embedded in the motor rotor, the motor rotor provides the torque required for the rotation of the propeller, and the overall integrity and stability of the rotor part are improved.

[0039] As shown in Figure 7 , the flux-switching permanent magnet motor stator 2 includes a modular stator core 201, a modular stator permanent magnet 202, and a stator winding 203.

[0040] The modular permanent magnet 202 has protrusions on both sides, and the modular stator core 201 has grooves on both sides, when all the modular permanent magnets and the modular stator core are closed along the circumference, the protrusions of the modular permanent magnet 202 are embedded in the grooves of the modular stator core 201, which can improve the integrity and stability of the stator, the modular stator permanent magnet 202 can be reasonably segmented along the axial direction according to the needs, which is beneficial to processing and reduces the eddy current loss, and the stator winding 203 is a concentrated winding which is tightly wound on the motor stator teeth through an insulation layer, and a section of the stator winding 203 in the stator slot is usually a straight line, the front and rear ends are tightly combined with the stator insulation waterproof sheath 7, the heat generated by the winding is conducted to the external conduit 1, and the heat dissipation capacity of the propulsion motor stator part is enhanced.

[0041] Compared with the brushless direct current motor, the permanent magnet synchronous motor and the permanent magnet fault-tolerant motor, the rim propeller of the built-in integrated motor, the structure of the permanent magnet installed on the rotor is avoided, the rotor is only a simple structure of silicon steel material, the permanent magnet is placed in the motor stator, so that it will not be affected by the centrifugal force of the permanent magnet of other types of motors rotating with the rotor, and the permanent magnet in the application is protected by the stator insulation waterproof sheath and does not directly contact with the fluid in the operating environment, which greatly increases the service life of the permanent magnet and enhances the operation reliability of the rim propeller.

[0042] The above is only one embodiment of the application, which is more specifically embodied in a paddleless shaft type rim propeller with a flux switching type permanent magnet motor as a propulsion motor, but does not limit the application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application, such as modifying the number of the modular stator core 201 and the modular stator permanent magnet 202 in the embodiment to other reasonable values; or the number of the embedded paddle 4 is changed to other number according to the change of the hydrodynamic performance or application occasion; or the rim propeller adopts a paddle shaft type, a transmission paddle shaft is added in the center of the paddle, and the end thrust bearings of the motor are cancelled, but the propulsion motor stator and rotor structure designed based on the flux switching type permanent magnet motor is still adopted; or the modular stator structure is not adopted or part of the modular stator structure is adopted due to processing needs, but the propulsion motor stator part designed based on the flux switching type permanent magnet motor is still adopted, which should also be included in the protection scope of the application.

[0043] In the description of the application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the application.

[0044] In the present application, unless specifically stated and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like, should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless specifically stated and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact or indirectly contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A propellerless rim propeller based on a flux-switching permanent magnet motor, characterized in that, It includes an external conduit (1), a flux-switching permanent magnet motor stator (2), a flux-switching permanent magnet motor rotor (3), an embedded blade (4), a rotor cover plate (5), a water-lubricated thrust bearing (6), and a stator insulating waterproof sheath (7); The external conduit (1) is sleeved on the outside of the flux-switching permanent magnet motor stator (2). The flux-switching permanent magnet motor rotor (3) is installed inside the flux-switching permanent magnet motor stator (2). The embedded blade (4) is embedded inside the flux-switching permanent magnet motor rotor (3). The rotor cover (5) is installed on both sides of the flux-switching permanent magnet motor rotor (3) and the embedded blade (4). Water-lubricated thrust bearings (6) are provided on the outside of the rotor cover (5). The water-lubricated thrust bearings (6) are connected to the external conduit (1). The stator insulating waterproof sleeve (7) is set in the air gap between the flux-switching permanent magnet motor stator (2) and the flux-switching permanent magnet motor rotor (3). The stator insulating waterproof sleeve (7) fits tightly against the flux-switching permanent magnet motor stator (2). The flux-switching permanent magnet motor stator (2) includes a circumferentially distributed modular stator core (201), a modular stator permanent magnet (202), and a stator winding (203). The modular stator permanent magnet (202) is interlocked with the modular stator core (201), and the stator winding (203) is wound inside the slot of the modular stator core (201). The water-lubricated thrust bearing (6) connects the rotor cover plate (5) and the external conduit (1), supports the flux-switching permanent magnet motor rotor (3) and the embedded blades (4), and transmits radial forward thrust and radial backward thrust.

2. A propellerless rim propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The radial dimension of the flux-switching permanent magnet motor stator (2) can change with the axial length of the motor. The radial dimension of one end of the flux-switching permanent magnet motor stator (2) is not equal to the radial dimension of the other end.

3. A propellerless rim-type propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The radial dimension of the flux-switching permanent magnet motor rotor (3) can change with the axial length of the motor. The radial dimension of one end of the flux-switching permanent magnet motor rotor (3) is not equal to the radial dimension of the other end.

4. A propellerless rim propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The rotor (3) of the flux-switching permanent magnet motor adopts a skewed pole structure and a rotor tooth filling material.

5. A propellerless rim-type propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The number of axial segments of the modular stator permanent magnet (202) can be adjusted.

6. A propellerless rim propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The modular stator permanent magnet (202) has protrusions on both sides, and the modular stator core (201) has grooves on both sides. When the modular stator permanent magnet (202) and the modular stator core (201) are closed along the circumference, the protrusions of the modular permanent magnet (202) are embedded in the grooves of the modular stator core (201).

7. A propellerless rim propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The stator winding (203) is a concentrated winding, which is tightly wound around the stator (2) of the flux switching permanent magnet motor through an insulation layer. The stator insulation waterproof sheath (7) is a non-magnetic and heat-conducting material, which also extends to the external conduit (1) at both ends of the axial direction of the flux switching permanent magnet motor stator (2) and is tightly fitted to the end of the stator winding (203).

8. A propellerless rim-type propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The embedded blade (4) has a groove on the outer skin, and the yoke of the flux-switching permanent magnet motor rotor (3) has a protrusion. The protrusion of the flux-switching permanent magnet motor rotor (3) is embedded in the groove of the embedded blade (4).

9. A propellerless rim propeller based on a flux-switching permanent magnet motor according to claim 1, characterized in that, The rotor cover plate (5) can be slotted to set a fluid flow channel to cool the rotor (3) of the flux switching permanent magnet motor.

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