CN212637877U - Axial flux motor driven annular electric propeller supported by shafting - Google Patents
Axial flux motor driven annular electric propeller supported by shafting Download PDFInfo
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- CN212637877U CN212637877U CN202020979926.0U CN202020979926U CN212637877U CN 212637877 U CN212637877 U CN 212637877U CN 202020979926 U CN202020979926 U CN 202020979926U CN 212637877 U CN212637877 U CN 212637877U
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Abstract
The utility model relates to an axial flux motor driven annular electric power propeller that shafting supported, include: the axial flux motor is connected with the propeller through the shaft system assembly. The utility model discloses among the electric propulsion system of having cancelled, motor to each transmission link between the screw, motor direct drive screw adopts the axial magnetic flux motor of two stator single rotor structures or many stators many rotor structures, has improved power density and efficiency, has reduced the running noise.
Description
Technical Field
The utility model belongs to the technical field of marine propulsor, concretely relates to axial flux motor driven's annular electric power propeller that shafting supported.
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 overcoming above shortcoming, raise the efficiency, prolong the bearing life-span, the utility model provides an axial flux motor (disc motor) by the shafting support, arrange aquatic in, the ring-shaped electric power propeller that direct drive has hub type screw, its rotor subassembly and screw subassembly are supported and transmit thrust to motor and hull on by the shafting and the bearing of arranging aquatic in.
For solving one of above-mentioned technical problem at least, the utility model discloses the technical scheme who takes is:
an axially flux motor driven annular electric thruster supported by a shafting, comprising: a housing, an axial flux motor, a propeller, and a shafting assembly, wherein,
the axial-flux electric machine includes: the end face flange is arranged at each of two ends of the shell, the stator component is fixed on the end face flange, the rotor component and the stator component are arranged in parallel, and the direction of an air gap magnetic field generated by the rotor component and the stator component is axial;
the shafting subassembly includes: the propeller shaft is connected with the propeller, the propeller shaft is arranged in the bearing block through the bearing group, and the bearing block is connected with the end face flange through the supporting plate;
the propeller is connected with the rotor assembly.
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 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.
Furthermore, two ends of the shell are respectively provided with a protective cover for protecting the axial flux motor and the shafting assembly.
Furthermore, the number of the stator assemblies is two, and the number of the rotor assemblies is one and is arranged between the two stator assemblies.
Furthermore, the stator assembly and the rotor assembly are multiple and are alternately inserted into the shell.
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 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, axial forces on two sides of a rotor are balanced, and the motor is high in efficiency and compact in structure; the permanent magnet is adopted to replace a coil, so that compared with a separately excited motor, the current loss is reduced, and the motor efficiency and the power factor are further improved; secondly, the inner circle of the rotor of the motor directly fixes the propeller, and the rotor directly drives the propeller to rotate, so that any intermediate transmission link is not needed;
4) the power density can be increased or decreased as desired: the double-stator single-rotor structure is adopted, magnetic fields on two sides of the rotor generate electromagnetic force to drive the rotor, meanwhile, the force is exerted, the power density is high, or more stators and rotors are integrated, the power density is improved, a single-stator single-rotor structure can be adopted, the power density is reduced, the structure is simplified, and the cost is saved;
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 schematic view of an integrated structure of the hub and the propeller shaft according to the present invention.
Fig. 3 is a schematic view of an integrated structure of the hub and the propeller shaft according to the present invention.
Fig. 4 is a first schematic view of a split structure of the hub and the propeller shaft according to the present invention.
Fig. 5 is a schematic view of a split structure of the hub and the propeller shaft according to the present invention.
Fig. 6 is a cross-sectional view taken along line C-C of the first embodiment of fig. 1.
Fig. 7 is a partially enlarged view of fig. 6.
Fig. 8 is a cross-sectional view taken along line C-C of the second embodiment of fig. 1.
Fig. 9 is a partially enlarged view of fig. 8.
Fig. 10 is a cross-sectional view taken along line C-C of the third embodiment of fig. 1.
Fig. 11 is a partially enlarged view of fig. 10.
The propeller comprises a shell 1, a propeller 2, a propeller hub 201, a blade tip flange 202, an end face flange 3, a rotor assembly 4, a permanent magnet 401, a support frame 402, a stator assembly 5, a propeller shaft 6, a bearing assembly 7, a bearing seat 8, a support plate 9, a protective cover 10 and a sealing piece 11.
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: as shown in fig. 1, 6 and 7, the annular electric propeller of this embodiment is of a double-stator single-rotor assembly structure, and mainly includes: the axial flux motor is connected with the propeller through the shaft system assembly.
The utility model discloses axial flux motor adopts axial flux permanent magnetism brushless motor (disc motor), and axial flux motor is different with ordinary motor, and its air gap is the plane, and air gap field direction is the axial, and the current-carrying conductor system is radially placed, and stator and rotor are the disc structure. The motor consists of a stator component, a rotor component, a machine shell and an end face flange. The left stator component and the right stator component are respectively fixed on the left end face flange and the right end face flange of the motor, and the middle part is a single rotor component. Motor stator module is axial iron core and coil constitution, also can design for no iron core structure, and stator module wholly encapsulates the packing protective material of multilayer sealed insulation, and isolated with water and play insulating effect. The rotor assembly is clamped between the two stator assemblies and is parallel to the stator assemblies, and the structure of the rotor assembly is not radially concentric with the stator like a common motor. 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 casing is the propeller casing, and both ends are connected the terminal surface flange and the protection casing of motor about the casing.
The rotor 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 the screw rotational speed, does not need intermediate transmission links such as gear. The left and right stator components of the motor generate a rotating magnetic field after a three-phase power supply is switched on, the permanent magnet in the middle rotor component generates electromagnetic force under the action of the rotating magnetic field, and the rotor rotates and outputs torque to drive the propeller to rotate in water to generate thrust for pushing a ship.
The utility model discloses a have hub type screw, replace no hub type screw, improved the rigidity of rotor-screw subassembly, reduced circumference and warp, the screw is the metallics screw, also can be the combined material screw, and the screw is integral, and the leaf number is decided according to the hydrodynamic force performance, can be 2 leaves, perhaps 3 leaves, 4 leaves, 5 leaves or more. Each blade is connected with the rotor 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.
The utility model discloses a shafting subassembly (including the bearing group) bears the weight of public rotor subassembly and screw, bears the thrust of screw simultaneously to transmit thrust to the hull.
Referring to fig. 2 and 3, a hub of the propeller and a propeller shaft are integrated, fig. 2 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. 3 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. 4 and 5, 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 support plate; the propeller shaft, the bearing group, the bearing seat, the supporting plate 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 positive and negative thrust of the propeller and the electromagnetic force of the motor, and transmits the positive and negative thrust to the end face flange of the motor and the annular shell through the bearing block and the supporting plate, and further transmits the positive and negative thrust to the ship body; fig. 4 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. 5 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 and rear protective covers are arranged at the front and rear ends of a flange (or a shell) on the end surface of the motor to play a role in protecting the motor, and the protective covers can be made into arc shapes or streamline shapes, so that resistance is reduced, and hydrodynamic performance is improved.
In many cases, the radial dimensions of the propeller and the propeller are limited due to limited draught of the ship or limited space dimensions of the stern, the diameter 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 under the condition 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: when the requirement on power density is not high, the power and the power density can be reduced by adopting a single-stator single-rotor type, as shown in fig. 8 and 9, the annular electric propeller of the embodiment is in a single-stator single-rotor assembly structure, different from embodiment 1, the number of the stator assemblies is set as one group, the rotor assembly is driven by only one single-stator assembly on one side, and by adopting the single stator and the single rotor, the power is reduced, the power density is reduced, but the structure is simple, the cost is low, and the annular electric propeller is suitable for the propellers with lower power and low requirement on the power density.
Example 3: when the power needs to be larger and the diameter is not changed, that is, the power density needs to be improved, the method can be realized by increasing the number of the stator assemblies and the rotor assemblies, that is, a plurality of stator assemblies simultaneously drive a plurality of rotor assemblies, and a plurality of rotor assemblies simultaneously drive a propeller. As shown in fig. 10 and 11, the annular electric thruster of this embodiment is of a three-stator and two-rotor assembly structure, and unlike embodiments 1 and 2, three stator assemblies drive two rotor assemblies, and two rotor assemblies simultaneously drive one propeller.
The motor adopts a multi-disc structure with three stators and double rotors, the front stator component and the rear stator component are respectively fixed on the front end face flange and the rear end face flange of the motor, and the middle stator component is embedded in the shell. The middle of each two stator components is provided with a rotor component, the middle of the front stator component and the middle stator component is provided with a front rotor component, and the middle of the middle stator component and the rear stator component is provided with a rear rotor component. The support frames of the two rotor assemblies are fastened with the blade tip flange of the propeller together to push the propeller to rotate together, the power of the motor is higher, and the power density is improved.
In a similar way, more stator assemblies and more rotor assemblies can be integrated on the propeller simultaneously, a propeller is driven simultaneously, the power and the power density of the propeller are continuously improved, and the propeller is enabled to send larger thrust by improving the power density and the power under the condition that the radial size is limited.
To sum up, the utility model discloses among the electric propulsion system, each transmission link between motor to the screw, motor direct drive screw adopts the axial flux motor of two stator single rotor structures or many stators many rotor structures, has improved power density and efficiency, has reduced the running noise. In addition, the elimination of the intermediate transmission link also reduces the weight, improves the reliability, reduces the occupied space in the cabin and improves the utilization rate of the space in the cabin. The electric ship is suitable for being used on various electric ships.
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 (7)
1. An axial flux motor driven annular electric thruster supported by a shafting, comprising: a housing, an axial flux motor, a propeller, and a shafting assembly, wherein,
the axial-flux electric machine includes: the end face flange is arranged at each of two ends of the shell, the stator component is fixed on the end face flange, the rotor component and the stator component are arranged in parallel, and the direction of an air gap magnetic field generated by the rotor component and the stator component is axial;
the shafting subassembly includes: the propeller shaft is connected with the propeller, the propeller shaft is arranged in the bearing block through the bearing group, and the bearing block is connected with the end face flange through the supporting plate;
the propeller is connected with the rotor assembly.
2. The annular electric thruster of claim 1, 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.
3. The annular electric thruster of claim 1, wherein the bearing set is assembled in the bearing seat, and one or more of water lubrication and oil lubrication are adopted between the propeller shaft and the bearing seat.
4. Annular electric thruster according to claim 3, characterized in that there is a seal between the propeller shaft and the bearing housing when oil-lubricated.
5. The annular electric thruster of claim 1, wherein the two ends of the housing are further provided with a protective cover for protecting the axial flux motor and the shafting assembly.
6. The toroidal electric thruster of any one of claims 1 to 5, wherein said stator assemblies are two, and said rotor assembly is one and disposed between two of said stator assemblies.
7. The annular electric thruster of any one of claims 1 to 5, wherein the stator assembly and the rotor assembly are both plural and alternately interpenetrated with each other within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020979926.0U CN212637877U (en) | 2020-06-02 | 2020-06-02 | Axial flux motor driven annular electric propeller supported by shafting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020979926.0U CN212637877U (en) | 2020-06-02 | 2020-06-02 | Axial flux motor driven annular electric propeller supported by shafting |
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| CN212637877U true CN212637877U (en) | 2021-03-02 |
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| CN202020979926.0U Active CN212637877U (en) | 2020-06-02 | 2020-06-02 | Axial flux motor driven annular electric propeller supported by shafting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955063A (en) * | 2021-11-15 | 2022-01-21 | 中国科学院沈阳自动化研究所 | Rim propeller driven by coreless permanent magnet motor |
| CN114313190A (en) * | 2022-01-04 | 2022-04-12 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Integrated motor propeller |
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2020
- 2020-06-02 CN CN202020979926.0U patent/CN212637877U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955063A (en) * | 2021-11-15 | 2022-01-21 | 中国科学院沈阳自动化研究所 | Rim propeller driven by coreless permanent magnet motor |
| CN114313190A (en) * | 2022-01-04 | 2022-04-12 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Integrated motor propeller |
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