CN107786032B - Magnetic bearing device applied to ship shaftless propeller - Google Patents
Magnetic bearing device applied to ship shaftless propeller Download PDFInfo
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- CN107786032B CN107786032B CN201711071308.5A CN201711071308A CN107786032B CN 107786032 B CN107786032 B CN 107786032B CN 201711071308 A CN201711071308 A CN 201711071308A CN 107786032 B CN107786032 B CN 107786032B
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- stator
- fixed
- rotor
- side wall
- fixing ring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Power Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
the invention discloses a magnetic bearing device applied to a ship shaftless propeller, which comprises a propeller shell, a stator and a rotor, wherein two first clamping blocks are fixed at two ends of the inner surface of the side wall of the propeller shell; the two ends of the stator are clamped between the two first clamping blocks, a Hall sensor is fixed on the inner surface of the side wall of the stator, a torque coil is embedded in the middle of the stator, three groups of excitation windings are arranged on the side wall of the stator, the excitation windings are additionally arranged on the stator, a floating force for offsetting the gravity borne by the rotor is generated on the rotor, a radial magnetic bearing is established between the rotor and the stator, the radial magnetic bearing does not completely replace a water lubrication bearing and is only used for improving the running state of the original bearing, the problems of boundary lubrication and dry friction of the water lubrication bearing in the starting, stopping and low-speed states are solved by the radial magnetic bearing, the running working condition of the water lubrication bearing can be improved in the running process, the running reliability of the propeller is guaranteed, and the radial magnetic bearing has the characteristics of simplicity in.
Description
Technical Field
the invention belongs to the field of magnetic bearings, and relates to a magnetic bearing device applied to a ship shaftless propeller.
background
the ship shaftless propeller is driven by a novel motor system, a propeller shaft is completely cancelled, and the ship shaftless propeller is a revolutionary technical progress for ship propulsion. The prior ship shaftless propeller mostly adopts a sialon water lubrication sliding bearing, and because the water lubrication bearing has higher requirements on material performance, the bearing material in China mainly depends on import at present.
The invention patent with the patent application number of 201410558863.0 discloses a propeller of a marine permanent magnet motor propeller, wherein the propeller is powered by a permanent magnet motor, a bearing and lubricating oil are not needed, transmission noise can be reduced, but the problems of boundary lubrication and dry friction exist when the bearing is lubricated by water in the permanent magnet motor in a start-stop state and a low-rotating-speed state, and meanwhile, the gravity influence of a rotor needs to be controlled due to the fact that the rotor has gravity, and the control process is complex.
Disclosure of Invention
The invention aims to provide a magnetic bearing device applied to a ship shaftless propeller, which is characterized in that a set of magnet exciting coils are added on a stator, according to the magnetic action principle, a floating force for offsetting the gravity borne by a rotor is generated on the rotor, a radial magnetic bearing is established between the rotor and the stator, the radial magnetic bearing does not completely replace a water lubrication bearing and is only used for improving the running state of the original bearing, the radial magnetic bearing solves the problems of boundary lubrication and dry friction of the water lubrication bearing in the starting and stopping and low rotating speed states, and the running working condition of the water lubrication bearing can be improved in the running process, so that the running reliability of the propeller is ensured, and the magnetic bearing device has the characteristics of simple control and reliable running.
The purpose of the invention can be realized by the following technical scheme:
a magnetic bearing device applied to a ship shaftless propeller comprises a propeller shell, a stator and a rotor, wherein two first clamping blocks are fixed at two ends of the inner surface of the side wall of the propeller shell;
Two ends of the stator are clamped between the two first clamping blocks, a Hall sensor is fixed on the inner surface of the side wall of the stator, a torque coil is embedded in the middle of the stator, and three groups of excitation windings are wound and fixed on the side wall of the stator;
The rotor is sleeved inside the stator, two axial water lubrication bearings are fixed between two end faces of the rotor and the two second clamping blocks, two radial water lubrication bearings are fixed between the outer surfaces of the side walls of the two ends of the rotor and the two second clamping blocks, the axial water lubrication bearings and the radial water lubrication bearings are fixed on the second clamping blocks, gaps are reserved between the axial water lubrication bearings and the radial water lubrication bearings and the rotor, the permanent magnet is embedded on the rotor, gaps are reserved between the permanent magnet and the torque coil, and a plurality of impeller blades are uniformly distributed on the inner surface of the side wall of the rotor.
furthermore, the pusher shell comprises a cylindrical shell, the side walls of the two ends of the cylindrical shell are inwards obliquely bent to form a conical cylinder wall, a fixed cylinder is vertically fixed at the bottom end of the conical cylinder wall, a second clamping block is fixed on the bottom surface of the fixed cylinder and is tightly pressed and connected with the inner surface of the side wall of the stator, the fixed cylinder and the cylindrical shell are coaxial, annular fixing grooves are formed in the two ends of the inner surface of the side wall of the cylindrical shell, first clamping blocks are fixed in the annular fixing grooves, and the first clamping blocks are tightly pressed and connected with the two ends of the stator.
Furthermore, the first clamping block comprises a first fixing ring, the first fixing ring and the cylinder shell are coaxial, the first fixing ring is clamped in the fixing groove and fixed in the fixing groove through screws, the inner ring of the first fixing ring is perpendicularly bent to form a first connecting ring, one end of the first connecting ring is perpendicularly bent inwards to form a second fixing ring, and two ends of the stator are clamped and connected with the end face of the second fixing ring.
Furthermore, the second clamping block comprises a third fixing ring, the third fixing ring is fixed to the bottom surface of the fixing cylinder through a screw, an outer ring of the third fixing ring is perpendicularly bent to form a fourth fixing ring, a fifth fixing ring is perpendicularly fixed to the outer surface of the side wall at one end of the joint of the fourth fixing ring and the third fixing ring, and two ends of the inner surface of the side wall of the stator are clamped and connected with the outer surface of the side wall of the fourth fixing ring.
furthermore, the three groups of excitation windings comprise a first excitation winding and two second excitation windings, the first excitation winding is arranged right below the side wall of the stator, the two second excitation windings are located on two sides of the first excitation winding, the two second excitation windings are arranged on the side wall of the stator, and the central angle from each second excitation winding and the first excitation winding to the axis of the stator is 60 degrees.
The invention has the beneficial effects that:
the ship shaftless propeller of the invention adopts an inner rotor type permanent magnet motor, a permanent magnet is embedded on a rotor of the permanent magnet motor, a paddle is fixed on an inner rotor, a stator is a coil, according to the structural characteristics of the ship shaftless propeller, the permanent magnet arranged on the rotor can be utilized, an excitation winding is added on the stator, according to the magnetic action principle, a floating force for offsetting the gravity borne by the rotor is generated on the rotor, a radial magnetic bearing is established between the rotor and the stator, the radial magnetic bearing does not completely replace a water lubrication bearing and is only used for improving the running state of the original bearing, the radial magnetic bearing solves the problems of boundary lubrication and dry friction of the water lubrication bearing in the starting and stopping and low rotating speed states, and the running working condition of the water lubrication bearing can be improved in the running process, thereby not only ensuring the running reliability of the propeller, but also having simple control, the operation is reliable.
The invention uses 3 excitation windings, makes the rotor float up by the repulsion force generated by the permanent magnet and the excitation coil, realizes the rotor angle detection by adopting the Hall sensor, and can offset the torque generated by the magnetic field on the rotor and the stress in the horizontal direction by controlling the current of the 3 excitation windings according to the rotor angle, so that the torque control of the motor is not influenced by the bearing excitation, and the original control of the motor is not changed.
In the invention, 3 excitation windings are all arranged at the lower part of the stator, and the excitation magnetic field and the rotor permanent magnet generate repulsion force, so that the characteristic that the size of the repulsion force is increased along with the distance between the windings and the stator permanent magnet is fully utilized, the floating force has certain self-adaptive control capability, and the control of the excitation current is simplified.
The bearing excitation circuit adopts PWM control, thereby improving the frequency of pulsation and reducing the amplitude of the pulsation.
drawings
in order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a magnetic bearing device of a shaftless propeller of a ship according to the present invention;
Fig. 2 is a schematic view of the stator and rotor structure of the present invention.
Detailed Description
A magnetic bearing device applied to a ship shaftless propeller comprises a propeller shell 1, a stator 2 and a rotor 3, wherein the propeller shell 1 is of a cylindrical structure, two first clamping blocks 4 are fixed at two ends of the inner surface of the side wall of the propeller shell 1, two second clamping blocks 5 are fixed at one ends of the two first clamping blocks 4, and the two second clamping blocks 5 are fixed at two ends of the propeller shell 1;
The two ends of the stator 2 are clamped between the two first clamping blocks 4, and the inner surface of the side wall of the stator 2 is tightly pressed and connected with the top surfaces of the two second clamping blocks 5; a Hall sensor 8 is fixed on the inner surface of the side wall of the stator 2, a torque coil 10 is embedded in the middle of the stator 2, three groups of excitation windings 11 are wound and fixed on the side wall of the stator 2, the excitation windings 11 are connected with a PWM control chip, the frequency of pulsation is improved by controlling an excitation circuit through PWM, and the amplitude of the pulsation is reduced;
the rotor 3 is sleeved inside the stator 2, two axial water lubricated bearings 6 are fixed between two end faces of the rotor 3 and the two second clamping blocks 5, two radial water lubricated bearings 7 are fixed between the outer surfaces of the side walls of two ends of the rotor 3 and the two second clamping blocks 5, the axial water lubricated bearings 6 and the radial water lubricated bearings 7 are both fixed on the second clamping blocks 5, permanent magnets are embedded on the rotor 3, gaps are reserved between the permanent magnets and the torque coil 10, a plurality of impeller blades 9 are uniformly distributed on the inner surface of the side wall of the rotor 3, gaps are reserved between adjacent blades 9 and opposite blades 9, after the torque coil 10 on the stator 2 is electrified, a magnetic field is generated, the surface of the rotor 3 is fixed with a permanent magnet, the rotor 3 generates eddy current due to cutting of magnetic lines of force, the eddy current further generates a counter-induction magnetic field, thereby generating a rotating torque to realize the rotation of the rotor 3, and driving the propeller blades 9 to rotate by the rotation of the rotor 3 to realize the running of the ship;
The propeller shell 1 comprises a cylinder shell 101, the side walls of two ends of the cylinder shell 101 are inwards obliquely bent to form a conical cylinder wall 102, a fixed cylinder 103 is vertically fixed at the bottom end of the conical cylinder wall 102, a second clamping block 5 is fixed on the bottom surface of the fixed cylinder 103, the second clamping block 5 is tightly pressed and connected with the inner surface of the side wall of the stator 2, the fixed cylinder 103 and the cylinder shell 101 are coaxial, annular fixing grooves are formed in two ends of the inner surface of the side wall of the cylinder shell 101, first clamping blocks 4 are fixed in the annular fixing grooves, and the first clamping blocks 4 are tightly pressed and connected with two ends of the stator 2.
The first clamping block 4 comprises a first fixing ring 401, the first fixing ring 401 and the cylinder shell 101 are coaxial, the first fixing ring 401 is clamped in the fixing groove and fixed in the fixing groove through screws, the inner ring of the first fixing ring 401 is vertically bent to form a first connecting ring 402, one end of the first connecting ring 402 is vertically bent inwards to form a second fixing ring 403, and two ends of the stator 2 are clamped and connected with the end face of the second fixing ring 403;
The second clamping block 5 comprises a third fixing ring 501, the third fixing ring 501 is fixed on the bottom surface of the fixing cylinder 103 through a screw, the outer ring of the third fixing ring 501 is vertically bent to form a fourth fixing ring 502, a fifth fixing ring 503 is vertically fixed on the outer surface of the side wall at one end of the joint of the fourth fixing ring 502 and the third fixing ring 501, and the fifth fixing ring 503 is fixed on the surface of the second fixing ring 403 through a screw; the axial water lubricated bearing 6 is fixed on one end face of the third fixed ring 501, the axial water lubricated bearing 6 is positioned at two ends of the rotor 3 and has a gap with the rotor 3, the radial water lubricated bearing 7 is fixed on the inner surface of the side wall of the fourth fixed ring 502, the radial water lubricated bearing 7 is positioned at two ends of the outer surface of the side wall of the rotor 3 and has a gap with the rotor 3, two ends of the inner surface of the side wall of the stator 2 are clamped and connected with the outer surface of the side wall of the fourth fixed ring 502, the stator 2 is fixed through the second fixed ring 203 and the fourth fixed ring 502, and simultaneously, because the axial water lubricated bearing 6 and the radial water lubricated bearing 7 have gaps with the rotor 3, cooling water can be in full contact with the water lubricated bearing, which is;
The three groups of excitation windings 11 comprise a first excitation winding 1101 and two second excitation windings 1102, the first excitation winding 1101 is arranged at the right lower end of the side wall of the stator 2, the two second excitation windings 1102 are positioned at two sides of the first excitation winding 1101, the two second excitation windings 1102 are arranged on the side wall of the stator 2, and the central angle from each second excitation winding 1102 and the first excitation winding 1101 to the axis of the stator 2 is 60 degrees; the permanent magnet arranged on the rotor 3 generates a floating force for offsetting the gravity borne by the rotor 3 on the basis of the magnetic action principle by adding the excitation winding 11 on the stator 2, and a radial magnetic bearing is established between the rotor 3 and the stator 2, does not completely replace a water lubrication bearing and is only used for improving the running state of the original bearing, solves the problems of boundary lubrication and dry friction of the water lubrication bearing in the starting and stopping and low rotating speed states, and can improve the running working condition of the water lubrication bearing in the running process, thereby ensuring the running reliability of the propeller and having the characteristics of simple control and reliable running; meanwhile, the rotor 3 floats by virtue of repulsion force generated by the permanent magnet on the rotor 3 and the excitation windings 11, the rotor angle detection is realized by adopting the Hall sensor, and the torque generated by the magnetic field on the rotor 3 and the stress in the horizontal direction can be mutually offset by controlling the currents of the three groups of excitation windings 11 according to the angle of the rotor 3, so that the torque control of the motor is not influenced by the bearing excitation, and the original control of the motor is not changed.
The working process of the magnetic bearing device of the shaftless propeller is as follows:
(1) The torque coil 10 on the stator 2 generates a magnetic field after being electrified, the surface of the rotor 3 is fixed with a permanent magnet, the rotor 3 generates eddy current due to cutting of magnetic lines of force, the eddy current further generates a counter-induction magnetic field, so that rotation torque is generated, the rotor 3 rotates, and the propeller blade 9 is driven to rotate through the rotation of the rotor 3 to realize the operation of the ship;
(2) Three groups of excitation windings 11 are arranged at the right lower end of the side wall of the stator 2, and an upper buoyancy force for offsetting the gravity borne by the rotor 3 is generated on the rotor 3 due to the interaction of a magnetic field generated by the excitation windings 11 and a permanent magnet on the rotor, so that a radial magnetic bearing is established between the rotor 3 and the stator 2, the radial magnetic bearing does not completely replace a water lubrication bearing and is only used for improving the running state of the original bearing, the radial magnetic bearing solves the problems of boundary lubrication and dry friction of the water lubrication bearing in the starting and stopping and low rotating speed states, and the running working condition of the water lubrication bearing can be improved in the running process, so that the running reliability of the propeller is ensured, and the propeller has the characteristics of simple control and reliable running;
(3) the repulsion that permanent magnet on the rotor 3 and excitation winding 11 produced makes rotor 3 float, detects rotor 3's angle through hall sensor simultaneously, according to rotor 3's angle, through the electric current of the excitation winding 11 of control three groups, can offset the torque that the magnetic field produced on rotor 3 and the atress of horizontal direction each other for the bearing excitation does not influence the torque control of motor, does not change the original control of motor.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The magnetic bearing device applied to the ship shaftless propeller is characterized by comprising a propeller shell (1), a stator (2) and a rotor (3), wherein two first clamping blocks (4) are fixed at two ends of the inner surface of the side wall of the propeller shell (1), two second clamping blocks (5) are fixed at one ends of the two first clamping blocks (4), and the two second clamping blocks (5) are fixed at two ends of the propeller shell (1);
The two ends of the stator (2) are clamped between the two first clamping blocks (4), a Hall sensor (8) is fixed on the inner surface of the side wall of the stator (2), a torque coil (10) is embedded in the middle of the stator (2), and three groups of excitation windings (11) are wound and fixed on the side wall of the stator (2);
Inside stator (2) was located to rotor (3) cover, two axial water lubricated bearings (6) were fixed with between the both ends face of rotor (3) and two second clamp tight piece (5), two radial water lubricated bearings (7) were fixed with between the both ends lateral wall surface of rotor (3) and two second clamp tight piece (5), axial water lubricated bearing (6) and radial water lubricated bearing (7) all are fixed in on second clamp tight piece (5), it is gapped between axial water lubricated bearing (6) and radial water lubricated bearing (7) and rotor (3), it is equipped with the permanent magnet to inlay on rotor (3), it is gapped between permanent magnet and torque coil (10), the lateral wall internal surface equipartition of rotor (3) has a plurality of impeller paddles (9).
2. The magnetic bearing device applied to the ship shaftless propeller is characterized in that the propeller shell (1) comprises a cylindrical shell (101), the side walls of two ends of the cylindrical shell (101) are bent inwards in an inclined manner to form a tapered cylinder wall (102), a fixed cylinder (103) is vertically fixed at the bottom end of the tapered cylinder wall (102), a second clamping block (5) is fixed on the bottom surface of the fixed cylinder (103), the second clamping block (5) is tightly connected with the inner surface of the side wall of the stator (2) in a pressing manner, the fixed cylinder (103) and the cylindrical shell (101) are coaxial, annular fixing grooves are formed in two ends of the inner surface of the side wall of the cylindrical shell (101), a first clamping block (4) is fixed in each annular fixing groove, and the first clamping block (4) is tightly connected with two ends of the stator (2).
3. The magnetic bearing device applied to the ship shaftless propeller is characterized in that the first clamping block (4) comprises a first fixing ring (401), the first fixing ring (401) is coaxial with the cylindrical shell (101), the first fixing ring (401) is clamped in the fixing groove and fixed in the fixing groove through screws, the inner ring of the first fixing ring (401) is vertically bent to form a first connecting ring (402), one end of the first connecting ring (402) is vertically bent inwards to form a second fixing ring (403), and two ends of the stator (2) are clamped and connected with the end face of the second fixing ring (403).
4. The magnetic bearing device applied to the ship shaftless propeller according to claim 2, wherein the second clamping block (5) comprises a third fixing ring (501), the third fixing ring (501) is fixed on the bottom surface of the fixing cylinder (103) through a screw, the outer ring of the third fixing ring (501) is vertically bent to form a fourth fixing ring (502), a fifth fixing ring (503) is vertically fixed on the outer surface of the side wall at one end of the joint of the fourth fixing ring (502) and the third fixing ring (501), and two ends of the inner surface of the side wall of the stator (2) are clamped and connected with the outer surface of the side wall of the fourth fixing ring (502).
5. The magnetic bearing device applied to the shaftless propeller of the ship is characterized in that the three groups of excitation windings (11) comprise a first excitation winding (1101) and two second excitation windings (1102), the first excitation winding (1101) is arranged right below the side wall of the stator (2), the two second excitation windings (1102) are positioned on two sides of the first excitation winding (1101), the two second excitation windings (1102) are arranged on the side wall of the stator (2), and the central angle of each second excitation winding (1102) from the first excitation winding (1101) to the axis of the stator (2) is 60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711071308.5A CN107786032B (en) | 2017-11-03 | 2017-11-03 | Magnetic bearing device applied to ship shaftless propeller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711071308.5A CN107786032B (en) | 2017-11-03 | 2017-11-03 | Magnetic bearing device applied to ship shaftless propeller |
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| Publication Number | Publication Date |
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| CN107786032A CN107786032A (en) | 2018-03-09 |
| CN107786032B true CN107786032B (en) | 2019-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2031469B1 (en) * | 2022-03-31 | 2023-10-24 | Insumo B V | Rim driven thruster and method for propelling a ship |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109334930B (en) * | 2018-11-15 | 2024-06-25 | 济南大学 | Shaftless propeller |
| CN113513480B (en) * | 2021-08-04 | 2022-03-08 | 合肥恒大江海泵业股份有限公司 | Submersible tubular pump drainage system with high-thrust water-lubricated bearing structure |
| CN114180018B (en) * | 2021-11-30 | 2022-11-25 | 赣州市潜行科技有限公司 | Hub-free rim propeller |
| CN115384739B (en) * | 2022-09-06 | 2023-05-16 | 中国科学院宁波材料技术与工程研究所 | Low temperature rise underwater propeller |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3718954A1 (en) * | 1987-06-05 | 1988-12-22 | Uwe Gartmann | Propeller arrangement, in particular for ship propulsion plants |
| NL1029389C2 (en) * | 2005-06-30 | 2007-01-04 | Marifin Beheer B V | Ashless screw. |
| CN101546931B (en) * | 2009-04-28 | 2011-07-27 | 中国船舶重工集团公司第七一二研究所 | Integrated propeller |
| JP5872255B2 (en) * | 2011-11-08 | 2016-03-01 | ヤマハ発動機株式会社 | Ship propulsion device |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2031469B1 (en) * | 2022-03-31 | 2023-10-24 | Insumo B V | Rim driven thruster and method for propelling a ship |
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