CN213139108U

CN213139108U - Axial magnetic flux motor driven contra-rotating paddle type annular electric propeller

Info

Publication number: CN213139108U
Application number: CN202020979890.6U
Authority: CN
Inventors: 郑锐聪; 邱湘瑶; 邵志江; 刘福超
Original assignee: Zhuhai Hantuda Technology Co ltd
Current assignee: Zhuhai Hantuda Technology Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-05-07
Anticipated expiration: 2030-06-02

Abstract

The utility model relates to an axial magnetic flux motor driven is to oar formula annular electric power propeller, including the propeller unit, the propeller unit includes: axial flux motor, propeller and shafting subassembly. The utility model provides an axial flux motor driven by bearing support, front and back arrangement to oar annular electric power propeller changes. The contra-rotating propeller is directly driven to rotate by the axial flux motor arranged in water, so that a transmission device in the middle is omitted, and the rotor assembly and the propeller are supported by a shafting and a bearing arranged in the water and transmit thrust to the motor and a ship body.

Description

Axial magnetic flux motor driven contra-rotating paddle type annular electric propeller

Technical Field

The utility model belongs to the technical field of marine propulsor, concretely relates to axial magnetism circular telegram motor drive's to oar formula annular electric power propeller that changes.

Background

With the development of electric propulsion technology, electric propulsion systems are increasingly used on ships. Common electric propulsion systems include change-speed gearboxes, shafting (including shafts, couplings, various bearings and bearing blocks, stern tube seals), propellers, etc.; the electric propulsion system adopts a propulsion mode that after a speed change gear box is driven by a motor to decelerate, a shaft system and a propeller are driven to rotate to generate the forward or backward thrust of the ship. This propulsion method has the following problems: the structure is complex, the number of parts is large, the failure rate is high, the occupied space is large, and the weight is heavy; the propulsion efficiency is low: the motor and the propeller are driven by components such as a gear, a shaft system and the like, the gear is meshed to generate energy loss, and meanwhile, the bearing is usually a sliding bearing, so that the friction force is large and the friction power consumption is large; the transmission links generate intermediate transmission loss, and the propulsion efficiency of the system is reduced; the transmission gear is meshed to generate vibration and cause noise, then, water flow generates turbulent flow after flowing through the shafting and the underwater appendage, the propeller rotates in the turbulent flow to generate excitation and cavitation, and the cavitation bursts to generate noise.

SUMMERY OF THE UTILITY MODEL

For the friction loss that reduces water lubricated bearing, simplify the propulsion system structure, improve the rigidity of screw and rotor subassembly, the utility model provides an axial flux motor driven's that arranges around, by bearing support to oar annular electric power propeller contrarotating. The contra-rotating propeller is directly driven to rotate by the axial flux motor arranged in water, so that a transmission device in the middle is omitted, and the rotor assembly and the propeller are supported by a shafting and a bearing arranged in the water and transmit thrust to the motor and a ship body.

For solving one of above-mentioned technical problem at least, the utility model discloses the technical scheme who takes is:

an axial flux motor driven counter-rotating propeller type annular electric thruster, comprising a thruster unit, the thruster unit comprising: axial flux motor, screw and shafting subassembly, the screw with the rotor subassembly of axial flux motor links to each other, the shafting subassembly includes: the propeller shaft is arranged in the bearing seat through the bearing group and is connected with the propeller, and the bearing seat is connected with an end face flange of the axial flux motor through the supporting spoke;

the forward rotation thruster unit and the reverse rotation thruster unit are coaxially arranged in parallel in the front and back direction, and the propeller of the forward rotation thruster unit and the propeller of the reverse rotation thruster unit are opposite in rotation direction and used for generating thrust in the same direction.

Further, the axial-flux electric machine includes: the magnetic-field-generating device comprises a shell, end face flanges, a rotor assembly and two stator assemblies, wherein the end face flanges are arranged at two ends of the shell respectively, the two stator assemblies are fixed on the end face flanges at two ends respectively, and the rotor assembly is arranged between the two stator assemblies and is in an axial direction with an air gap magnetic field direction generated by the two stator assemblies.

Further, the rotor assembly includes: the permanent magnet is embedded in the support frame, the support frame and the stator assembly are arranged in parallel, and one end of the support frame is connected with the propeller through a blade tip flange.

Further, the device also comprises a protective cover which is connected with the shell.

Further, the bearing group is assembled in the bearing seat, and one or more of water lubrication and oil lubrication modes are adopted between the propeller shaft and the bearing seat.

Further, when an oil lubrication mode is adopted, a sealing element is arranged between the propeller shaft and the bearing seat.

Further, the propeller is a hub propeller.

Further, the contra-rotating propeller type annular electric propeller comprises a plurality of the propeller units connected in series.

The beneficial effects of the utility model include at least:

1) the friction and wear are reduced: a shafting and sliding bearing (or rolling bearing) is adopted to replace a rim type water lubrication bearing, the linear velocity of the surface of the bearing is reduced, the friction force and the friction power consumption are reduced, the abrasion loss is reduced, the service life of the bearing is prolonged, and the reliability of the propeller is improved;

2) the rigidity of the propeller is improved: the propeller with the hub is adopted to replace a propeller without the hub, so that the rigidity of the propeller-rotor assembly is improved, the deformation of a rotor is reduced, the uniformity of an air gap of a motor is ensured, and the high efficiency of the motor is ensured;

3) the propulsion efficiency is improved: firstly, an axial flux permanent magnet brushless motor (a disc type motor) with a double-stator and single-rotor structure is adopted, so that the motor efficiency is high; secondly, the motor rotor directly drives the propeller to rotate, any intermediate transmission link is not needed, and transmission loss is reduced; thirdly, a counter-rotating paddle type is adopted, the rear paddle absorbs the energy of the circumferential rotating vortex of the front paddle, and the efficiency is further improved;

4) the double motors are adopted for high power density, each motor is of a double-stator single-rotor structure, magnetic fields on two sides of each rotor generate electromagnetic force to drive the rotors, and meanwhile, the output is high, the power density is high, and even higher power and thrust can be achieved through the combination of more stages of propellers;

5) noise vibration reduction: because the rotor directly drives the propeller, vibration and noise caused by gear meshing of a gear box in the traditional propulsion mode are eliminated.

Drawings

Fig. 1 is a schematic view of the propeller structure of the present invention.

Fig. 2 is a cross-sectional view of the first embodiment of fig. 1 taken along line C-C.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a first structural schematic diagram of the hub and the propeller shaft of the propeller according to the present invention.

Fig. 5 is a schematic view of an integrated structure of the hub and the propeller shaft of the propeller according to the present invention.

Fig. 6 is a first schematic view of a structure of a propeller hub and a propeller shaft of the propeller according to the present invention.

Fig. 7 is a schematic view of a hub and a propeller shaft split structure of the propeller according to the present invention.

Fig. 8 is a cross-sectional view of the second embodiment of fig. 1 taken along line C-C.

Wherein, 1, a front bearing group; 2. a forward propeller shaft; 3. a front cover; 4. a front bearing seat; 5. a front support spoke; 6, a front propeller; 7. a front shield; 8. a front end flange of the front motor; 9. the front motor is provided with a double stator component; 10. a front motor single rotor assembly; 11. a housing; 12. a flange on the rear end face of the front motor; 13. a flange on the front end face of the rear motor; 14. a rear motor single rotor assembly; 15. the rear motor is provided with a double stator component; 16. a rear end face flange of the rear motor; 17. a rear shield; 18. a rear propeller; 19. a rear support spoke; 20. a rear bearing seat; 21. a rear cover; 22. a rear propeller shaft; 23. a rear bearing set; 24. a blade tip flange; 25. a hub; 26. a seal member; 27. a first stage thruster unit; 28. a second stage thruster unit; 29. a third stage thruster unit.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

Example 1: in the embodiment of the present invention, the utility model discloses a two propeller units arranged from beginning to end are combined to form, as shown in fig. 1-3, forward (preceding) propeller unit and reverse (back) propeller unit are coaxially arranged side by side around, and every propeller unit contains axial flux motor (disc motor), screw and shafting subassembly. Each motor is independently controlled by the controller, each motor drives one propeller, the rotating directions are opposite, the thrust directions are consistent, counter-rotating propellers arranged in the front and the back are formed, the back propeller absorbs the circumferential rotating vortex energy of the front propeller, and the propelling efficiency is improved. The motor type is the axial magnetic flux permanent magnet brushless motor (disc motor) of two stator single rotor types, and direct drive screw is rotatory, and on screw thrust transmitted the motor through the bearing group, and then finally promoted the hull.

It can be understood that, in the embodiment of the present invention, two motors are connected in series and coaxially arranged in front of and behind each other, and each drives one propeller. Preceding screw corotation, back screw reversal, the direction of turning round of front and back screw is opposite, and the thrust direction is unanimous, and the circumferential direction vortex energy of preceding screw is absorbed to the back screw, forms the contra-rotating oar, has improved propulsion efficiency, and paddle parameters such as the blade number and pitch distribution of preceding, back screw need carry out hydrodynamic optimization design and confirm.

The utility model discloses an axial magnetic flux permanent magnetism brushless motor (disc motor) different with ordinary motor, its air gap is the plane, and air gap magnetic field direction is the axial, and the current-carrying conductor system is radially placed, and stator module and rotor subassembly are the disc structure. The motor consists of a stator component, a rotor component, a shell and an end face flange. The utility model discloses well preceding, back motor is two stator single rotor structures, and in every motor, two stator module fix respectively around the motor on the end face flange, the centre is single rotor subassembly. Motor stator module constitutes for axial iron core and coil, also can design for no iron core structure, and the whole embedment of stator fills protective material with the sealed insulating packing of multilayer, and isolated and play insulating effect with water. The rotor assembly is sandwiched between the two stator assemblies and is parallel to the stator assemblies, rather than being radially concentric with the stator as in conventional motors. The rotor assembly comprises a permanent magnet and a support frame, the permanent magnet is embedded in the support frame, and an insulating filling material is encapsulated and sealed in the support frame to prevent water from entering the interior of the support frame to corrode the permanent magnet. The shell is the shell of the propeller, and the left end and the right end of the shell are connected with end face flanges of the motor.

The utility model discloses the rotor subassembly internal diameter is big, can hold the screw, and the screw is fixed on the blade tip flange, and the blade tip flange is connected with rotor support frame internal diameter, and the rotor directly drives the screw and rotates, and motor speed is screw rotational speed promptly, does not need intermediate transmission links such as gear. The left stator and the right stator of the motor generate a rotating magnetic field after being connected with a three-phase power supply, the permanent magnet in the middle rotor assembly generates electromagnetic force under the action of the rotating magnetic field, the rotor rotates and outputs torque, and the propeller rotates in water to generate thrust for pushing a ship.

The utility model adopts the hub type propeller to replace the hub-free propeller, thereby improving the rigidity of the rotor-propeller assembly and reducing the circumferential deformation. The propeller with the hub is a metal propeller or a composite propeller, the propeller is integral, and the number of blades can be 2, or 3, 4, 5 or more blades according to hydrodynamic performance. Each blade is connected with the rotor assembly support frame through the blade tip flange, the rotor directly drives the propeller to rotate through the blade tip flange, the rotating speed of the motor is the rotating speed of the propeller, and transmission links such as gears are not needed.

Referring to fig. 4 and 5, a hub of the propeller and a propeller shaft are integrated, fig. 4 shows that a water lubrication mode is adopted between the bearing seat and the propeller shaft, that is, a gap is arranged between the bearing seat and the propeller shaft, so that water can flow in conveniently, fig. 5 shows that an oil lubrication mode is adopted between the bearing seat and the propeller shaft, and a sealing element is arranged between the bearing seat and the propeller shaft, so that grease can be prevented from leaking and water can be prevented from entering.

Referring to fig. 6 and 7, a hub and a propeller shaft of the propeller are of a split structure, blade root parts of blades of the propeller are connected with the hub, the hub is assembled on the propeller shaft, the propeller shaft is assembled on a bearing group, the bearing group is assembled in a bearing seat, and the bearing seat is fixed on a flange on the end face of the motor through a supporting spoke; the bearing seats and the supporting spokes can be positioned at two sides of the propeller, namely fixed on end face flanges at two sides, and when the supporting rigidity is enough, only the supporting spokes and the bearing seats at one side can be reserved, so that the construction is simplified and the cost is reduced. The propeller shaft, the bearing group, the bearing seat, the supporting spokes and the like form a shafting assembly. The bearing group comprises a radial bearing and a thrust bearing, the radial bearing supports the weight of the rotor assembly and the propeller, and the thrust bearing bears the forward and reverse thrust of the propeller and the electromagnetic force of the motor and transmits the forward and reverse thrust to the end face flange of the motor and the annular shell through the bearing seat and the support spokes so as to transmit the forward and reverse thrust to the ship body; fig. 6 shows that the bearing seat and the propeller shaft are in a water lubrication mode, namely, a gap is arranged between the bearing seat and the propeller shaft, so that water can flow in conveniently; fig. 7 shows that the bearing block is oil-lubricated with the propeller shaft, and a seal is provided between the bearing block and the propeller shaft to prevent leakage of grease and entry of water.

The front protective cover is arranged at the front end of the front motor, the rear protective cover is arranged at the rear end of the rear motor, the front cover and the rear cover are arranged at two ends of the front protective cover and the rear protective cover respectively, the front protective cover and the rear protective cover play roles in protecting the motor and a rotating thrust disc and bearing the thrust of a propeller, the front protective cover and the rear protective cover can be made into arc shapes or streamline shapes, resistance is favorably reduced, and hydrodynamic performance is improved.

In this embodiment of the present invention, the propeller is driven by a double stator and a single rotor. However, in many cases, the radial dimensions of the propeller and the propeller are limited due to limited draft of the ship or limited stern space dimensions, the diameters of the propeller and the propeller cannot be further increased, and the power can be increased by increasing the number of the stator and the rotor in order to increase the power in the case of limited radial dimensions. Under the condition of limited radial dimension, the number of the integrated motor stator and rotor of the propeller is increased, and the power density are improved; the number of integrated motor stators and rotors of the propeller is reduced and the power and power density is reduced.

Example 2: the utility model discloses in this embodiment, every axial flux motor and screw and shafting have formed independent, modular propeller unit, can carry out many propeller unit's tandem like this, form the propeller combination of multistage linkage. When a set of propeller unit is added, the front end face flange of the propeller unit is fastened on the rear end face flange of the front propeller unit, and then the rear protective cover and the rear cover are assembled on the last propeller unit. That is, not only the propellers can be formed by the pairs of propeller units, but also the propeller with 3-stage propeller as shown in fig. 8 can be formed by 3 sets of propeller units, the propeller with 4-stage propeller is formed by 4 sets of propeller units, and 5-stage, 6-stage, 7-stage and more stages, etc. By the combination of the multistage thruster, higher power and thrust can be achieved. Of course, in order to improve the hydrodynamic performance, the propeller of each stage of propeller unit needs to be subjected to hydrodynamic optimization calculation, and the propellers of each stage of propeller unit may be different.

In summary, the utility model cancels each transmission link from the motor to the propeller in the electric propulsion system, the motor directly drives the propeller, the efficiency is high, the structure is simple, and the reliability is high; two motors are adopted to drive the contra-rotating propellers or a plurality of motors are adopted to drive more propellers, so that the efficiency is improved, and the power density is high; the structure with the hub type propeller and the shafting is adopted, so that the rigidity of the propeller and the rotor assembly is improved; in addition, the motor is arranged under water, so that the occupied space in the cabin is reduced, and the utilization rate of the space in the cabin is improved; the electric ship is suitable for being used on various electric ships.

In the description of the present invention, it is to be understood that the terms "front", "back", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations can be made in the above embodiments by those skilled in the art without departing from the scope of the present invention, and that various changes in the detailed description and applications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims

1. The utility model provides an axial flux motor driven is to oar annular electric thruster that changes, its characterized in that, includes propeller unit, propeller unit includes: axial flux motor, screw and shafting subassembly, the screw with the rotor subassembly of axial flux motor links to each other, the shafting subassembly includes: the propeller shaft is arranged in the bearing seat through the bearing group and is connected with the propeller, and the bearing seat is connected with an end face flange of the axial flux motor through the supporting spoke;

2. The contra-rotating propeller annular electric thruster of claim 1, wherein the axial-flux electric machine comprises: the magnetic-field-generating device comprises a shell, end face flanges, a rotor assembly and two stator assemblies, wherein the end face flanges are arranged at two ends of the shell respectively, the two stator assemblies are fixed on the end face flanges at two ends respectively, and the rotor assembly is arranged between the two stator assemblies and is in an axial direction with an air gap magnetic field direction generated by the two stator assemblies.

3. The contra-rotating propeller annular electric thruster of claim 2, wherein the rotor assembly comprises: the permanent magnet is embedded in the support frame, the support frame and the stator assembly are arranged in parallel, and one end of the support frame is connected with the propeller through a blade tip flange.

4. The contra-rotating propeller annular electric thruster of claim 2, further comprising a protective cover connected to the housing.

5. The contra-rotating propeller type annular electric propeller as claimed in claim 1, wherein the bearing set is assembled in the bearing seat, and one or more of water lubrication and oil lubrication is adopted between the propeller shaft and the bearing seat.

6. The contra-rotating propeller annular electric thruster of claim 1, wherein a seal is provided between the propeller shaft and the bearing housing when oil lubrication is used.

7. Contra-rotating propeller annular electric thruster according to claim 1, characterized in that the propeller is a hubbed propeller.

8. The contra-rotating propeller annular electric thruster according to any of claims 1-7, comprising a plurality of said thruster units in series.