CN109263844B

CN109263844B - Low-speed hub direct-drive integrated electric propulsion device for ship

Info

Publication number: CN109263844B
Application number: CN201811007824.6A
Authority: CN
Inventors: 严新平; 杨植; 欧阳武
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2020-05-05
Anticipated expiration: 2038-08-31
Also published as: CN109263844A

Abstract

The invention discloses a ship low-speed hub direct-drive integrated electric propulsion device, which is characterized in that: the shell body, the shell body includes pipe and conduit support, the pipe is both ends opening form, is equipped with conduit support respectively at the both ends of pipe, is equipped with magnetism modulation ring stator in the pipe, the both ends of magnetism modulation ring stator link to each other with conduit support respectively, is equipped with inner rotor subassembly and outer rotor subassembly respectively at the inside and outside of magnetism modulation ring stator, the both ends of inner rotor subassembly dispose with conduit support through inner bearing subassembly respectively mutually, and outer rotor subassembly's both ends dispose with conduit support through outer bearing subassembly respectively mutually, are connected with the screw subassembly outside outer rotor ring of rotor subassembly outside, conduit support passes through the stand and links to each other with the hull. Compared with the traditional mechanical shafting propelling device, the device cancels intermediate links such as a gear box, a transmission shafting, sealing and the like, highly integrates a motor, a propeller, a guide pipe and a bearing, and has simpler and more compact structure and higher power density.

Description

Low-speed hub direct-drive integrated electric propulsion device for ship

Technical Field

The invention relates to the field of ship propulsion, in particular to a ship low-speed hub direct-drive integrated electric propulsion device.

Background

The mechanical shafting propulsion device is the most widely applied propulsion form of various ships at present and mainly comprises a gear reducer, a transmission shafting, a propeller and the like, wherein the transmission shafting comprises a thrust bearing, a plurality of intermediate shafts, an intermediate bearing, a tail shaft, a tail bearing, a seal and other complex parts according to different ship type requirements. However, with the development of ships, such propulsion devices have exposed a number of drawbacks, such as: the submarine shafting penetrates through the pressure shell, so that the manufacturing cost is high, and the stealth capability of the submarine is severely limited by vibration and noise generated by the shafting; a complex coupling dynamic relationship exists between a ship body of a large-sized transport ship and a propulsion shafting; the ship body is deformed to cause the misalignment of a propulsion shaft system, so that the vicious accidents of bearing lubrication failure, seal damage, severe shaft system vibration, breakage of a connecting flange bolt, even breakage of a main engine crankshaft and the like are easily caused; the propulsion shafting occupies a large ship space, and the cargo transportation volume is reduced.

To solve the above-mentioned problem, a propulsion mode in which a propeller is directly driven by a motor is proposed. In order to reduce cavitation, the rotating speed of the ship propeller is low. The rotating speed of a common motor is equal to the ratio of sixty times of the motor frequency to the number of pole pairs of the motor, so that the rotating speed of the motor is reduced by reducing the power supply frequency of the motor or increasing the number of pole pairs of the motor. The low frequency supply of the frequency converter often affects the stability of the operation of the motor and is therefore difficult to use in the direct drive mode of the propulsion device. Furthermore, increasing the pole pair number tends to increase the leakage inductance and lower the power factor, so the asynchronous motor is not well suited for low-speed high-torque direct drive. When the number of pole pairs of the permanent magnet motor is increased, the power factor of the permanent magnet motor is not reduced, the torque density is high, and the permanent magnet motor is more suitable for low-speed and high-torque direct drive application. However, in order to obtain high torque density, the volume of the permanent magnet needs to be increased, so that the volume of the motor is overlarge, and a pod for mounting the motor has large volume, so that the problems of large water flow resistance, difficulty in matching with a ship body and the like are caused. On the other hand, designers often adopt a driving mode in which a high-speed or medium-speed motor drives a multi-stage reduction gear box. However, this mode has problems such as loud noise, low reliability, susceptibility to vibration, lubrication problems, and cooling problems. Therefore, how to realize the realization of the direct drive mode of the motor by canceling the transmission shaft system and avoid a plurality of defects caused by the reduction gear is a key problem to be solved for developing a novel ship propulsion system.

Disclosure of Invention

The invention aims to solve the technical problem of providing a ship low-speed hub direct-drive integrated electric propulsion device which has a compact structure and high power density and realizes low-speed and high-torque electric propulsion aiming at the defects in the prior art.

The technical scheme adopted by the invention is as follows: integrated electric propulsion unit is directly driven to boats and ships low-speed wheel hub, its characterized in that: the shell body, the shell body includes pipe and conduit support, the pipe is both ends opening form, is equipped with conduit support respectively at the both ends of pipe, is equipped with magnetism modulation ring stator in the pipe, the both ends of magnetism modulation ring stator link to each other with conduit support respectively, is equipped with inner rotor subassembly and outer rotor subassembly respectively at the inside and outside of magnetism modulation ring stator, the both ends of inner rotor subassembly dispose with conduit support through inner bearing subassembly respectively mutually, and outer rotor subassembly's both ends dispose with conduit support through outer bearing subassembly respectively mutually, are connected with the screw subassembly outside outer rotor ring of rotor subassembly outside, conduit support passes through the stand and links to each other with the hull.

According to the technical scheme, gaps are respectively arranged between the inner side and the outer side of the magnetic modulation ring stator and between the inner rotor and the outer rotor, and a plurality of cooling water channels are formed in the magnetic modulation ring stator.

According to the technical scheme, the outer rotor assembly comprises an outer rotor ring, a plurality of square grooves are formed in the inner wall of the outer rotor ring at equal intervals in the circumferential direction, and permanent magnets are embedded in the square grooves.

According to the technical scheme, the permanent magnet protective layer is arranged on the surface of the permanent magnet.

According to the technical scheme, the inner rotor assembly comprises an inner rotor ring, a plurality of square grooves are formed in the outer wall of the inner rotor ring at equal intervals in the circumferential direction, and permanent magnets are embedded in the square grooves.

According to the technical scheme, the propeller of the propeller component is connected with the outer rotor ring and extends outwards to form a hub driving mode, the propeller can be provided with a pressure sensor, the incoming flow direction is judged through stress, and adjustment is made according to the incoming flow direction.

According to the technical scheme, the inner wall and the outer wall of the magnetic modulation ring stator are both provided with protective layers.

According to the technical scheme, the outer bearing assembly comprises an outer bearing bush and an outer rotor bearing piece, and the radial sections of the outer bearing bush and the outer rotor bearing piece are T-shaped; the inner bearing assembly includes an inner bearing shell and an inner rotor carrier, both of which are circular in radial cross-section.

The beneficial effects obtained by the invention are as follows:

1. compared with the traditional mechanical shafting propelling device, the device cancels intermediate links such as a gear box, a transmission shafting, sealing and the like, highly integrates a motor, a propeller, a guide pipe and a bearing, and has simpler and more compact structure and higher power density.

2. The magnetic modulation ring is added between the inner rotor and the outer rotor, when the number of pole pairs of the permanent magnets of the inner rotor and the outer rotor is in different proportions, different transmission ratios can be obtained, the transmission ratio is equal to the ratio of the number of pole pairs of the permanent magnets of the outer rotor to the number of pole pairs of the permanent magnets of the inner rotor, the number of the magnet adjusting blocks is equal to the sum of the number of pole pairs of the permanent magnets of the inner rotor and the outer rotor, and due to the concentric structure, the permanent magnets of the inner rotor and the outer rotor can both transmit torque. In addition, the screw propeller and the guide cover can be replaced by conventional metal materials into high polymer materials according to requirements, and the weight is lighter under the condition that enough strength is ensured, so that a ship with larger weight can be pushed under the same power.

3. The magnetic modulation ring is used for driving through magnetic transmission, mechanical contact of a traditional gear is avoided, and the condition that the motor is overlarge in size due to the fact that a common permanent magnet motor achieves large torque is avoided.

4. The invention can be applied to the application occasions with low speed and large torque, which need stable operation and energy-saving and environment-friendly requirements, such as large passenger ships, large submerging vehicles and the like, and has the advantages of small volume, light weight, compact structure, high energy utilization rate, long service life, small vibration noise and the like compared with the traditional technology.

Drawings

Fig. 1 is a schematic diagram of the general structure of the present invention.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a front sectional view of the present invention.

Fig. 4 is a sectional view a-a of fig. 3.

In the figure: 1. a conduit; 2. a propeller; 3. a hub; 4. a catheter stent; 5. a magnetic modulation ring stator; 6. an outer rotor permanent magnet; 7. an outer rotor; 8. an inner rotor permanent magnet; 9. an inner rotor; 10. an inner rotor bearing member; 11. an outer rotor bearing member; 12. a paddle board; 13. an outer rotor protective layer; 14. an inner rotor protective layer; 15. a stator protection layer; 17. 18, 19, 20, small hole; 21. an inner bearing shell; 22. an outer bearing shell; 23. a hub cap; 24. and (4) a column.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1-3, the present embodiment provides a low-speed hub direct-drive integrated electric propulsion device for a ship, which comprises an outer casing, wherein the outer casing comprises a conduit 1 and a conduit bracket 4, the conduit 1 is open at two ends, the two ends of the catheter 1 are respectively provided with a catheter bracket 4 arranged in a cross shape, a magnetic modulation ring stator 5 is arranged in the catheter 1, the two ends of the magnetic modulation ring stator 5 are respectively connected with the catheter bracket, an inner rotor component and an outer rotor component are respectively arranged on the inner side and the outer side of the magnetic modulation ring stator 5, two ends of the inner rotor component are respectively configured with the catheter bracket through an inner bearing component, two ends of the outer rotor component are respectively configured with the catheter bracket through an outer bearing component, the outer side of the outer rotor ring of the outer rotor assembly is connected with a propeller assembly, the outer side of the catheter bracket 4 is correspondingly provided with a hub cap 23, and the shell is connected with the ship body through a stand column 24.

The magnet adjusting ring stator 5 is formed by evenly distributing magnetic materials and non-magnetic materials. Gaps are respectively arranged between the inner side and the outer side of the magnetic modulation ring stator 5 and between the inner rotor and the outer rotor, and a plurality of magnetic modulation rings are arranged on the magnetic modulation ring stator 5.

The inner rotor and the outer rotor are used as torque input and output parts and are respectively composed of permanent magnets and iron yokes, and the permanent magnets of the inner rotor and the outer rotor are N, S permanent magnets which are magnetized in the radial direction and are distributed at intervals. The outer rotor component comprises an outer rotor ring 7 with multiple magnetic poles, a plurality of square grooves are formed in the inner wall of the outer rotor ring 7 in the circumferential direction at equal intervals, and permanent magnets 6 are embedded in the square grooves. The permanent magnet 6 is adhered to the inner wall of the outer rotor ring 7, and as seawater enters the motor during operation, an outer rotor protective layer 13 is wrapped outside the outer rotor permanent magnet to prevent corrosion, and the outer surface of the protective layer can be provided with ripples or micro-grooves.

Similarly, the inner rotor assembly comprises an inner rotor ring 9 with few magnetic poles, a plurality of square grooves are formed in the outer wall of the inner rotor ring 9 in the circumferential direction at equal intervals, and permanent magnets 8 are embedded in the square grooves. The permanent magnet 8 is embedded in the square groove; the side of the permanent magnet opposite to the magnetic modulation ring stator 5 is provided with a stator protection layer 14 for isolating the permanent magnet from seawater. Gaps are formed between the stator

protective layers

15 and 16 and the outer rotor permanent magnet 6 and the inner rotor permanent magnet 8; during operation, the seawater cools the inside of the whole electric propulsion device through the gap.

According to the invention, the magnet adjusting ring stator 5 is added between the inner rotor ring and the outer rotor ring, when the number of pole pairs of the inner and outer rotor permanent magnets is in different proportions, different transmission ratios can be obtained, the transmission ratio is equal to the ratio of the number of pole pairs of the outer rotor permanent magnets to the number of pole pairs of the inner rotor permanent magnets, and the number of magnet adjusting blocks on the magnet adjusting ring stator 5 is equal to the sum of the number of pole pairs of the inner and outer rotor permanent magnets.

In the embodiment, the outer bearing component and the inner bearing component both adopt water lubricated bearings to replace a bearing system of an oil lubricated bearing in a traditional propeller, on one hand, the bearing system utilizes water in a natural environment as a medium, no additional lubricant is needed to be added, and no pollution is caused to the environment; on the other hand, the bearing system does not need to be sealed, and the problems of lubricant leakage and the like can not occur. The magnetic modulation ring stator 5 is provided with a plurality of

small holes

17, 18, 19 and 20 to form a cooling water channel, so that cold water can conveniently enter and cool each part in the whole electric propulsion device. Meanwhile, a gap is formed between the paddle board 12 and the outer rotor ring 7, so that water can conveniently enter the motor. The outer bearing assembly comprises an outer bearing bush 22 and an outer rotor bearing piece 11, the outer bearing bush and the outer rotor bearing piece are sleeved outside the magnet adjusting ring stator 5, the radial sections of the outer bearing bush and the outer rotor bearing piece are arranged in a T shape, and the structure can bear radial force and axial force. The inner bearing assembly comprises an inner bearing shell 21 and an inner rotor carrier 10, both of which are circular in radial cross-section and abut against the two ends of the inner rotor ring, respectively.

In this embodiment, the housing 1 and the catheter holder 4 are formed of a reinforced organic polymer material to reduce weight and load and have sufficient strength and toughness. The propeller structure is a shaftless rim drive propeller 2 made of reinforced organic polymer materials, the root of the propeller is provided with a blade plate 12, and the blade plate 12 is drilled with screw holes and can be connected with an outer rotor ring 7 through screws. For convenience, the propellers are machined separately so that the entire propeller need not be removed if a single propeller is damaged. The propeller is connected with the outer rotor ring and extends outwards to form a hub driving mode, a pressure sensor can be installed on the propeller, the incoming flow direction is judged through stress, and the kinetic energy of the propeller is adjusted according to the incoming flow direction and is fully utilized for conversion.

In addition, a full-rotation device can be arranged on the upright post 24, and a 360-degree full-rotation function can be realized. And 1 or more devices can be arranged on the underwater vehicle to realize the multi-degree-of-freedom flexible motion of the vehicle.

When the integrated electric propulsion device directly driven by the low-speed hub of the ship provided by the invention works, under the action of an electromagnetic field, the electrified magnet adjusting ring stator 5 simultaneously drives the inner rotor ring 9 and the outer rotor ring 7, the outer rotor ring 7 drives propeller blades to rotate to generate thrust, and when blades rotate, water enters from one end of the guide pipe and exits from the other end of the guide pipe. When the thrust is directed towards the rear bearing, the outer bearing shoes 22 transmit the thrust to the housing 1, which is in turn transmitted by the uprights 24 to the hull to propel the boat through.

Claims

1. Integrated electric propulsion unit is directly driven to boats and ships low-speed wheel hub, its characterized in that: the shell body, the shell body includes pipe and conduit support, the pipe is both ends opening form, is equipped with conduit support respectively at the both ends of pipe, is equipped with magnetism modulation ring stator in the pipe, the both ends of magnetism modulation ring stator link to each other with conduit support respectively, is equipped with inner rotor subassembly and outer rotor subassembly respectively at the inside and outside of magnetism modulation ring stator, the both ends of inner rotor subassembly dispose with conduit support through inner bearing subassembly respectively mutually, and outer rotor subassembly's both ends dispose with conduit support through outer bearing subassembly respectively mutually, are connected with the screw subassembly outside outer rotor ring of rotor subassembly outside, conduit support passes through the stand and links to each other with the hull.

2. The marine low-speed hub direct-drive integrated electric propulsion device of claim 1, characterized in that: gaps are respectively arranged between the inner side and the outer side of the magnetic modulation ring stator and between the inner rotor and the outer rotor, and a plurality of cooling water channels are arranged on the magnetic modulation ring stator.

3. The marine low-speed hub direct drive integrated electric propulsion device of claim 1 or 2, characterized in that: the outer rotor assembly comprises an outer rotor ring, a plurality of square grooves are formed in the inner wall of the outer rotor ring in the circumferential direction at equal intervals, and permanent magnets are embedded in the square grooves.

4. A marine low-speed hub direct-drive integrated electric propulsion device according to claim 3, characterized in that: and a permanent magnet protective layer is arranged on the surface of the permanent magnet.

5. The marine low-speed hub direct drive integrated electric propulsion device of claim 1 or 2, characterized in that: the inner rotor assembly comprises an inner rotor ring, a plurality of square grooves are formed in the circumferential direction of the outer wall of the inner rotor ring at equal intervals, and permanent magnets are embedded in the square grooves.

6. The marine low-speed hub direct drive integrated electric propulsion device of claim 4, further comprising: and a permanent magnet protective layer is arranged on the surface of the permanent magnet.

7. The marine low-speed hub direct drive integrated electric propulsion device of claim 1 or 2, characterized in that: the propeller of the propeller component is connected with the outer rotor ring and extends outwards to form a hub driving mode, a pressure sensor can be installed on the propeller, the incoming flow direction is judged through stress, and adjustment is made according to the incoming flow direction.

8. The marine low-speed hub direct drive integrated electric propulsion device of claim 1 or 2, characterized in that: the inner wall and the outer wall of the magnetic modulation ring stator are both provided with protective layers.

9. The marine low-speed hub direct drive integrated electric propulsion device of claim 1 or 2, characterized in that: the outer bearing assembly comprises an outer bearing bush and an outer rotor bearing piece, and the radial sections of the outer bearing bush and the outer rotor bearing piece are T-shaped; the inner bearing assembly includes an inner bearing shell and an inner rotor carrier, both of which are circular in radial cross-section.