A cylindrical submersible oil-lubricated transverse flux permanent magnet linear motor

Abstract

A cylindrical submersible oil horizontal-flux permanent magnet linear motor belongs to the technical field of linear motors. Four primary salient pole teeth are provided on the inner circular surfaces of the first and second yokes of the primary iron core. The first and second primary iron cores are coaxially fixedly connected and have an installation angle difference of 60°. One pair of the primary salient pole teeth of the first and second primary iron cores overlap in position, and the other pair of primary salient pole teeth are staggered in position. Windings are installed on the staggered primary salient pole teeth. Six secondary salient pole teeth are evenly distributed on the outer circular surface of the yoke of the first secondary iron core. Four secondary rectangular grooves are opened on the end surface of the yoke of the first secondary iron core. Permanent magnets are embedded in the secondary rectangular grooves. A plurality of the first and second secondary iron cores are alternately arranged and coaxially fixedly connected. A secondary iron core is fixedly installed on the barrel shaft. The primary structure of the motor is sleeved outside the secondary iron core. An air gap is provided between the secondary salient pole teeth and the primary salient pole teeth. At the initial position, the primary salient pole teeth of the first primary iron core are aligned with the secondary salient pole teeth. The motor of the present invention uses less permanent magnets, has a high utilization rate of permanent magnets, and has low magnetic leakage.

Description

Technical Field

[0001] The present invention belongs to the technical field of linear motors, and particularly relates to a cylindrical submersible transverse flux permanent magnet linear motor. Background Art

[0002] The downhole reciprocating submersible electric system is a rodless oil production system that combines a linear motor and a reciprocating plunger pump, and has the advantages of low system energy consumption and high efficiency. In traditional submersible motors, longitudinal flux motors are often used, and the plane where the main magnetic flux is located is parallel to the moving direction of the secondary, so there are problems such as tooth-slot space competition, small thrust density, large structural size, and poor fault tolerance performance. And the existing submersible transverse flux linear motors have problems such as a large amount of permanent magnet usage, complex structure, and large magnetic leakage. Summary of the Invention

[0003] The purpose of the present invention is to provide a cylindrical submersible transverse flux permanent magnet linear motor to solve the above problems existing in the prior art.

[0004] In the transverse flux motor of the present invention, the plane where the magnetic force lines are located is perpendicular to the moving direction of the secondary structure of the motor, solving the problem of tooth-slot space competition in the primary. And the transverse flux permanent magnet linear motor of the present invention has the advantages of large thrust density, compact structure, good fault tolerance performance, etc., and is particularly suitable for occasions such as downhole oil production that require high power density and harsh working conditions. In order to protect the permanent magnet and improve the utilization rate of the permanent magnet, the permanent magnet is installed in a manner of being embedded inside the secondary iron core. Considering the heat dissipation problem of the motor, if the natural cooling method is used, when the heat dissipation of the motor is not good, the output thrust of the motor will be reduced. Therefore, the present invention designs a cooling water channel in the non-magnetic conducting ring to cool the motor, so as to increase the current density and thrust density and reduce the detent force of the motor.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A cylindrical submersible transverse flux permanent magnet linear motor includes a motor primary structure and a motor secondary structure, both of which are cylindrical; the motor primary structure includes a primary iron core and four windings, and the primary iron core includes a primary iron core one and a primary iron core two; the motor secondary structure includes a barrel shaft, a secondary iron core, and a plurality of permanent magnets, and the secondary iron core includes a plurality of secondary iron core ones and a plurality of secondary iron core twos;

[0007] The inner circular surfaces of the yoke parts of the primary iron core 1 and the primary iron core 2 are each provided with four primary salient poles. The four primary salient poles are arranged in pairs opposite to each other. The primary iron core 1 and the primary iron core 2 are attached to each other front and back and fixedly connected coaxially, and the installation angles differ by 60°. One pair of the primary salient poles of the primary iron core 1 and the primary iron core 2 overlap in position, and the other pair of primary salient poles are staggered in position. Windings are installed on the primary salient poles of the primary iron core 1 and the primary iron core 2 where they are staggered in position; on the outer circular surface of the yoke part of each secondary iron core 1, six secondary salient poles are evenly distributed. On the end surface of the yoke part of each secondary iron core 1, four secondary rectangular slots are opened. The four secondary rectangular slots are arranged in pairs opposite to each other. Permanent magnets are embedded in the secondary rectangular slots. A plurality of secondary iron cores 1 and a plurality of secondary iron cores 2 are arranged alternately in sequence front and back and fixedly connected coaxially. The six secondary salient poles of the plurality of secondary iron cores 1 are arranged opposite to each other. A secondary iron core is fixedly installed on the barrel shaft. The primary structure of the motor is sleeved outside the secondary iron core. An air gap is provided between the secondary salient poles of the secondary iron core and the primary salient poles of the primary iron core; in the initial position, the primary salient poles of the primary iron core 1 are aligned with the secondary salient poles.

[0008] Furthermore, the primary iron core 1, the primary iron core 2, the secondary iron core 1, and the secondary iron core 2 are each laminated from silicon steel sheets insulated from each other.

[0009] Furthermore, the magnetic flux path generated by the permanent magnet is as follows: The magnetic flux starts from the N pole of the permanent magnet, passes through the yoke part of the secondary iron core 1 to reach the secondary salient pole, passes through the air gap between the primary salient pole and the secondary salient pole to reach the primary salient pole, then passes through the yoke part of the primary iron core to reach another primary salient pole adjacent to the said primary salient pole, passes through the air gap and the secondary salient pole, and finally returns to the S pole of the permanent magnet via the yoke part of the secondary iron core 1;

[0010] The magnetic flux path generated by the winding is as follows: The magnetic flux starts from the winding, passes through the primary salient pole with the winding installed and the air gap to reach the secondary salient pole, and then divides into two paths. The two paths of magnetic flux pass through the two permanent magnets arranged on both sides of the said secondary salient pole to reach the secondary salient pole adjacent to the two permanent magnets, then pass through the air gap to reach the primary salient pole, and return to the winding through the yoke part of the primary iron core 1;

[0011] The magnetic flux path generated by the permanent magnet and the magnetic flux path generated by the winding together constitute the main magnetic flux path of the motor. The main magnetic flux path of the motor is perpendicular to the movement direction of the secondary structure of the motor.

[0012] A cylindrical submersible transverse flux permanent magnet linear motor includes a motor secondary structure and an m-phase motor primary structure, both of which are cylindrical; each single-phase motor primary structure includes a primary iron core and four windings. The primary iron core includes a primary iron core 1 and a primary iron core 2; the motor secondary structure includes a barrel shaft, a secondary iron core, and a plurality of permanent magnets. The secondary iron core includes a plurality of secondary iron cores 1 and a plurality of secondary iron cores 2;

[0013] The inner circular surfaces of the yokes of the primary iron core one and the primary iron core two are each provided with four primary salient pole teeth. The four primary salient pole teeth are arranged in pairs opposite to each other. The primary iron core one and the primary iron core two are fixed to be coaxially connected by being attached to each other front and back, and the installation angles differ by 60°. One pair of the primary salient pole teeth of the primary iron core one and the primary iron core two overlap in position, and the other pair of primary salient pole teeth are staggered in position. Windings are installed on the primary salient pole teeth where the primary iron core one and the primary iron core two are staggered in position; on the outer circular surface of each yoke of the secondary iron core one, six secondary salient pole teeth are evenly distributed. On the end surface of each yoke of the secondary iron core one, four secondary rectangular slots are opened. The four secondary rectangular slots are arranged in pairs opposite to each other. Permanent magnets are embedded in the secondary rectangular slots. A plurality of secondary iron core ones and a plurality of secondary iron core twos are alternately arranged in sequence front and back and are coaxially fixed to be connected. The six secondary salient pole teeth of the plurality of secondary iron core ones are arranged opposite to each other. A secondary iron core is fixedly installed on the barrel shaft. The primary structure of the m-phase motor is sleeved outside the secondary iron core. An air gap is provided between the secondary salient pole teeth of the secondary iron core and the primary salient pole teeth of the primary iron core. Every two adjacent primary structures of the single-phase motor are arranged at a distance of 2τ / m in the axial direction, where τ represents the pole pitch and m represents the number of phases of the motor, m≥2; at the initial position, the primary salient pole teeth of the primary iron core one are aligned with the secondary salient pole teeth.

[0014] Furthermore, all the primary iron cores and the secondary iron cores are laminated by silicon steel sheets insulated from each other.

[0015] Furthermore, the magnetic flux path generated by the permanent magnet is as follows: The magnetic flux starts from the N pole of the permanent magnet, passes through the yoke of the secondary iron core one to reach the secondary salient pole teeth, passes through the air gap between the primary salient pole teeth and the secondary salient pole teeth to reach the primary salient pole teeth, then passes through the yoke of the primary iron core to reach another primary salient pole tooth adjacent to the said primary salient pole tooth, passes through the air gap and the secondary salient pole teeth, and finally returns to the S pole of the permanent magnet via the yoke of the secondary iron core one;

[0016] The magnetic flux path generated by the winding is as follows: The magnetic flux starts from the winding, passes through the primary salient pole teeth with the winding installed and the air gap to reach the secondary salient pole teeth, and then divides into two paths. The two paths of magnetic flux pass through the two permanent magnets arranged on both sides of the said secondary salient pole teeth to reach the secondary salient pole teeth adjacent to the two permanent magnets, then pass through the air gap to reach the primary salient pole teeth, and return to the winding through the yoke of the primary iron core one;

[0017] The magnetic flux path generated by the permanent magnet and the magnetic flux path generated by the winding together constitute the main magnetic flux path of the motor. The main magnetic flux path of the motor is perpendicular to the movement direction of the secondary structure of the motor.

[0018] Furthermore, a non-magnetic ring is fixedly installed between every two adjacent primary structures of the single-phase motor. On both end faces of the non-magnetic ring, two water channel grooves are symmetrically provided. Two cooling water channels are fitted in the water channel grooves of the plurality of non-magnetic rings. The two cooling water channels are symmetrically arranged and form a double-channel parallel waterway.

[0019] Furthermore, the cooling water path is composed of multiple groups of arc-shaped water paths and multiple U-shaped water paths. The multiple groups of arc-shaped water paths are arranged in parallel. The number of groups of arc-shaped water paths is the same as the number of non-magnetic rings. Each group of arc-shaped water paths includes two arc-shaped water paths. One end of the two arc-shaped water paths is connected to both ends of the U-shaped water path. Each adjacent two groups of arc-shaped water paths are connected through the U-shaped water path.

[0020] The beneficial effects of the present invention compared with the prior art are as follows:

[0021] 1. Both the primary iron core and the secondary iron core of the motor are laminated with silicon steel sheets insulated from each other, greatly reducing the iron loss generated by eddy currents and reducing the heat generation of the iron core.

[0022] 2. The motor of the present invention has a simple structure and adopts the installation method of embedding permanent magnets in the secondary iron core. Compared with the traditional submersible permanent magnet linear motor, the motor of the present invention uses less permanent magnets, has a high utilization rate of permanent magnets, and has low magnetic leakage. The permanent magnets are not in direct contact with the air gap, which can play a role in protecting the permanent magnets and is suitable for the harsh underground environment.

[0023] 3. The motor of the present invention is a transverse flux motor, and its magnetic field is distributed in a three-dimensional space (the plane where the magnetic flux circuit is located is perpendicular to the moving direction of the motor secondary and cannot be equivalently analyzed as a two-dimensional magnetic field, so the magnetic field is distributed in three dimensions), realizing the decoupling of the circuit and the magnetic circuit. Therefore, a larger cross-section of the primary salient pole teeth and a larger cross-section of the coil can be obtained simultaneously (that is, the problem of the primary tooth-slot competing for space is solved, and the tooth-slot is decoupled), increasing the electric load and magnetic load of the motor and improving the torque density of the motor. The main magnetic flux circuit of the motor is perpendicular to the moving direction of the motor secondary structure, with a large thrust density and good fault tolerance performance.

[0024] 4. The present invention adopts the method of a cooling water path to cool down the motor, keeping the motor in a lower temperature rise state; the water cooling system allows the motor to select a higher electromagnetic load; the cooling water path uses a parallel water path, which has a large heat dissipation area, a simple structure, and is convenient for processing. Description of the Drawings

[0025] Figure 1 is an axonometric view of a cylindrical submersible transverse flux permanent magnet linear motor of the present invention, which is an axial single-phase motor;

[0026] Figure 2 is the front view of the primary iron core one;

[0027] Figure 3 is the front view of the primary iron core two;

[0028] Figure 4 is the front view of the secondary iron core one;

[0029] Figure 5 is the front view of the secondary iron core two;

[0030] Figure 6 It is a schematic diagram of the loop formed by the magnetic flux when the reluctance of the primary iron core one is the smallest;

[0031] Figure 7 It is a schematic diagram of the secondary iron core two under the magnetic circuit when the reluctance of the primary iron core one is the smallest;

[0032] Figure 8 It is a schematic diagram of the loop formed by the magnetic flux when the reluctance of the secondary iron core two is the smallest;

[0033] Figure 9 It is a schematic diagram of the primary iron core one under the magnetic circuit when the reluctance of the secondary iron core two is the smallest;

[0034] Figure 10 It is an axonometric view of a cylindrical submersible transverse flux permanent magnet linear motor of the present invention, which is an axial three-phase motor containing a non-magnetic ring;

[0035] Figure 11 It is an axonometric view of a cylindrical submersible transverse flux permanent magnet linear motor of the present invention, which is an axial three-phase motor without a non-magnetic ring;

[0036] Figure 12 It is an assembly drawing of the non-magnetic ring and the cooling water path;

[0037] Figure 13 It is an axonometric view of two symmetrically arranged cooling water paths.

[0038] The names and reference numerals of the components involved in the above drawings are as follows:

[0039] Motor primary structure 1, primary iron core one 2, primary iron core two 3, winding 4, motor secondary structure 5, secondary slot 6, secondary iron core one 7, non-magnetic ring 8, water channel slot 9, cooling water path 10, primary salient pole tooth 11, barrel shaft 12, permanent magnet 13, secondary salient pole tooth 14, U-shaped water path 15, arc-shaped water path 16, path one 17, path two 18, secondary iron core two 19. Detailed implementation manners

[0040] Detailed implementation manner one: As Figures 1-9 shown, this implementation manner discloses a cylindrical submersible transverse flux permanent magnet linear motor, which includes a motor primary structure 1 and a motor secondary structure 5 both in a cylindrical shape; the motor primary structure 1 includes a primary iron core and four windings 4, and the primary iron core includes a primary iron core one 2 and a primary iron core two 3 (with the same structure); the motor secondary structure 5 includes a barrel shaft 12, a secondary iron core and a plurality of permanent magnets 13, and the secondary iron core includes a plurality of secondary iron cores one 7 (with the same structure) and a plurality of secondary iron cores two 19 (with the same structure);

[0041] On the inner circular surfaces of the yokes of the first primary iron core 2 and the second primary iron core 3, four primary salient poles 11 are provided. The four primary salient poles 11 are arranged in pairs opposite to each other. The first primary iron core 2 and the second primary iron core 3 are coaxially fixedly connected by being attached to each other front and back (fixedly connected by means of laminating), and the installation angles differ by 60°. One pair of primary salient poles 11 of the first primary iron core 2 and the second primary iron core 3 overlap in position (are arranged opposite to each other), and the other pair of primary salient poles 11 are staggered in position (offset). Windings 4 are installed on the first primary iron core 2 and the second primary iron core 3 at the primary salient poles 11 that are staggered in position; on the outer circular surface of the yoke of each first secondary iron core 7, six secondary salient poles 14 are evenly distributed. On the end face of the yoke of each first secondary iron core 7, four secondary rectangular slots 6 are opened. The four secondary rectangular slots 6 are arranged in pairs opposite to each other (the four secondary rectangular slots 6 are arranged on the end face of the yoke of the first secondary iron core 7 and are located on both sides of a pair of primary salient poles 11 where the first primary iron core 2 and the second primary iron core 3 coincide in position). Permanent magnets 13 are embedded in the secondary rectangular slots 6. A plurality of first secondary iron cores 7 and a plurality of second secondary iron cores 19 are alternately arranged in sequence front and back and are coaxially fixedly connected (fixedly connected by means of laminating). The six secondary salient poles 14 of the plurality of first secondary iron cores 7 are arranged opposite to each other. A secondary iron core is fixedly installed on the tubular shaft 12, and the primary structure 1 of the motor is sleeved outside the secondary iron core. An air gap is provided between the secondary salient poles 14 of the secondary iron core and the primary salient poles 11 of the primary iron core; in the initial position, the primary salient poles 11 of the first primary iron core 2 are aligned with the secondary salient poles 14 (the above technical solution constitutes an axial single-phase motor).

[0042] Furthermore, the first primary iron core 2, the second primary iron core 3, the first secondary iron core 7, and the second secondary iron core 19 are all laminated by silicon steel sheets insulated from each other (greatly reducing the iron loss generated by eddy currents and reducing the heating of the iron core).

[0043] Furthermore, the magnetic flux path generated by the permanent magnet 13 is as follows: The magnetic flux starts from the N pole of the permanent magnet 13, passes through the yoke of the first secondary iron core 7 to reach the secondary salient pole 14, passes through the air gap between the primary salient pole 11 and the secondary salient pole 14 to reach the primary salient pole 11, then passes through the yoke of the primary iron core to reach another primary salient pole 11 adjacent to the primary salient pole 11, passes through the air gap and the secondary salient pole 14, and finally returns to the S pole of the permanent magnet 13 via the yoke of the first secondary iron core 7;

[0044] The magnetic flux path generated by the winding 4 is as follows: The magnetic flux starts from the winding 4, passes through the primary salient pole 11 on which the winding 4 is installed and the air gap to reach the secondary salient pole 14, and then divides into two paths. The two paths of magnetic flux pass through the two permanent magnets 13 arranged on both sides of the secondary salient pole 14 to reach the secondary salient pole 14 adjacent to the two permanent magnets 13, then pass through the air gap to reach the primary salient pole 11, and return to the winding 4 through the yoke of the first primary iron core 2;

[0045] The magnetic flux loop generated by the permanent magnet 13 and the magnetic flux loop generated by the winding 4 together constitute the main magnetic flux loop of the motor. The main magnetic flux loop of the motor is perpendicular to the movement direction of the motor secondary structure 5 .

[0046] Specific implementation method 2: Figures 2-13 As shown, this embodiment discloses a cylindrical submersible transverse flux permanent magnet linear motor, including a motor secondary structure 5 and an m-phase motor primary structure 1, both of which are cylindrical in shape. Each single-phase motor primary structure 1 includes a primary iron core and four windings 4, and the primary iron core includes a primary iron core 1 2 and a primary iron core 2 3 (with the same structure). The motor secondary structure 5 includes a cylindrical shaft 12, a secondary iron core, and a plurality of permanent magnets 13. The secondary iron core includes a plurality of secondary iron cores 1 7 (with the same structure) and a plurality of secondary iron cores 2 19 (with the same structure).

[0047] The inner circular surface of the yoke of the primary core 1 2 and the primary core 2 3 is provided with four primary salient pole teeth 11, and the four primary salient pole teeth 11 are arranged opposite to each other in pairs. The primary core 1 2 and the primary core 2 3 are coaxially fixedly connected front and back (fixed in a stacking manner), and the installation angles differ by 60°. One pair of the primary salient pole teeth 11 of the primary core 1 2 and the primary core 2 3 overlap (are arranged opposite each other), and the other pair of the primary salient pole teeth 11 are staggered (are staggered). The windings 4 are installed on the primary salient pole teeth 11 of the primary core 1 2 and the primary core 2 3 that are located at the staggered positions; six secondary salient pole teeth 14 are arranged on the outer circular surface of the yoke of each secondary core 1 7, and four secondary rectangular slots 6 are opened on the end face of the yoke of each secondary core 1 7, and the four secondary rectangular slots 6 are arranged opposite to each other in pairs (the four secondary rectangular slots 6 are arranged on the end face of the yoke of the secondary core 1 7, and are located at The primary iron core 1 2 and the primary iron core 2 3 are positioned on both sides of a pair of primary salient pole teeth 11 that overlap, the permanent magnet 13 is embedded in the secondary rectangular slot 6, and multiple secondary iron cores 1 7 and multiple secondary iron cores 2 19 are alternately arranged front to back and coaxially fixedly connected (fixedly connected by stacking), the six secondary salient pole teeth 14 of the multiple secondary iron cores 1 7 are arranged opposite each other, and the secondary iron core is fixedly mounted on the cylindrical shaft 12. The primary structure 1 of the m-phase motor is mounted on the outside of the secondary iron core, and an air gap is provided between the secondary salient pole teeth 14 of the secondary iron core and the primary salient pole teeth 11 of the primary iron core. The primary structures 1 of each adjacent two single-phase motors are staggered by a distance of 2τ / m in the axial direction, where τ represents the pole pitch and m represents the number of phases of the motor, and m≥2; in the initial position, the primary salient pole teeth 11 of the primary iron core 2 are aligned with the secondary salient pole teeth 14 (the above technical solution constitutes an axial multi-phase motor).

[0048] Furthermore, all primary cores and secondary cores are formed by laminating silicon steel sheets that are insulated from each other (greatly reducing the iron loss caused by eddy currents and lowering the heating of the core).

[0049] Furthermore, the magnetic flux loop generated by the permanent magnet 13 is as follows: The magnetic flux starts from the N pole of the permanent magnet 13, reaches the secondary salient pole teeth 14 through the yoke part of the first secondary iron core 7, passes through the air gap between the primary salient pole teeth 11 and the secondary salient pole teeth 14 to reach the primary salient pole teeth 11, then passes through the yoke part of the primary iron core to reach another primary salient pole teeth 11 adjacent to the primary salient pole teeth 11, passes through the air gap and the secondary salient pole teeth 14, and finally returns to the S pole of the permanent magnet 13 via the yoke part of the first secondary iron core 7;

[0050] The magnetic flux loop generated by the winding 4 is as follows: The magnetic flux starts from the winding 4, passes through the primary salient pole teeth 11 where the winding 4 is installed and the air gap to reach the secondary salient pole teeth 14, and then divides into two paths. The two paths of magnetic flux pass through the two permanent magnets 13 arranged on both sides of the secondary salient pole teeth 14 to reach the secondary salient pole teeth 14 adjacent to the two permanent magnets 13, then pass through the air gap to reach the primary salient pole teeth 11, and return to the winding 4 through the yoke part of the first primary iron core 2;

[0051] The magnetic flux loop generated by the permanent magnet 13 and the magnetic flux loop generated by the winding 4 together constitute the main magnetic flux loop of the motor, and the main magnetic flux loop of the motor is perpendicular to the moving direction of the secondary structure 5 of the motor.

[0052] Furthermore, a non-magnetic ring 8 is fixedly installed between every two adjacent primary structures 1 of the single-phase motor. Two water channel grooves 9 are symmetrically arranged on both end faces of the non-magnetic ring 8. Two cooling water channels 10 are fitted in the water channel grooves 9 of multiple non-magnetic rings 8. The two cooling water channels 10 are symmetrically arranged and form a double-channel parallel waterway.

[0053] Furthermore, the cooling water channel 10 is composed of multiple groups of arc-shaped water channels and multiple U-shaped water channels 15. The multiple groups of arc-shaped water channels are arranged in parallel. The number of groups of arc-shaped water channels is the same as the number of non-magnetic rings 8. Each group of arc-shaped water channels includes two arc-shaped water channels 16. One end of the two arc-shaped water channels 16 is connected to both ends of the U-shaped water channel 15. Every two adjacent groups of arc-shaped water channels are connected through the U-shaped water channel 15 (with the above structure of the cooling water channel 10, the cooling path becomes longer and the cooling effect is good).

[0054] The main magnetic flux loop of the motor is as Figures 6-9 shown. The magnetic flux loop generated by the permanent magnet 13 is: starting from the N pole of the permanent magnet 13, reaching the secondary salient pole teeth 14 through the yoke part of the first secondary iron core 7, passing through the air gap between the primary salient pole teeth 11 and the secondary salient pole teeth 14 to reach the primary salient pole teeth 11, then passing through the yoke part of the primary iron core to reach another primary salient pole teeth 11 adjacent to the primary salient pole teeth 11, passing through the air gap and the secondary salient pole teeth 14, and finally returning to the S pole of the permanent magnet 13 via the yoke part of the first secondary iron core 7;

[0055] The magnetic flux loop generated by the winding 4 flows according to path one 17 and path two 18, as Figure 6As shown in FIG. The magnetic flux generated by the winding 4 passes through the primary salient pole teeth 11 on which the winding 4 is mounted and through the air gap to reach the secondary salient pole teeth 14. It then splits into two paths. The two paths of magnetic flux pass through the two permanent magnets 13 disposed on either side of the secondary salient pole teeth 14 to reach the secondary salient pole teeth 14 adjacent to the two permanent magnets 13. The two paths of magnetic flux then pass through the air gap to reach the primary salient pole teeth 11, and finally return to the winding 4 through the yoke of the primary core 2. (Advantages: Compared with traditional submersible motors, the utilization rate of the permanent magnets 13 is high; and the motor's main magnetic flux circuit is perpendicular to the direction of motion of the motor's secondary structure 5. The motor is a transverse flux motor, which has the advantages of high thrust density and tooth-slot decoupling.)

[0056] When the motor is working, the winding 4 is energized. At the initial position, the primary salient pole teeth 11 of the primary core 2 are aligned with the secondary salient pole teeth 14. Figure 6 、 Figure 7 As shown, the flux linkage (magnetic flux + number of turns) of the two windings 4 on the primary core 2 reaches the maximum value ψ m , and the two staggered primary salient pole teeth 11 on the primary core 2 3 are facing the slot between the two axial secondary salient pole teeth 14 of the secondary core 1 7, so the magnetic flux of the two windings 4 on the primary core 2 3 is minimum.

[0057] When the secondary core moves forward by one pole pitch, the primary salient pole teeth 11 of the primary core 2 3 are aligned with the secondary salient pole teeth 14, as shown in FIG. Figure 8 、 Figure 9 As shown, the flux linkage of the two windings 4 on the primary core 2 3 reaches the maximum value ψ m , and the two staggered primary salient pole teeth 11 on the primary core 1 2 are facing the slot between the two secondary salient pole teeth 14 in the axial direction of the secondary core 1 7, so the flux linkage of the two windings 4 on the primary core 1 2 is the minimum. Figure 6 and Figure 7 When the two windings 4 on the primary core 1 2 are powered off, the two windings 4 on the primary core 2 3 are powered on. At this time, since the two windings 4 on the primary core 2 3 are not at the position of minimum magnetic resistance, they will be subjected to the magnetic field force to Figure 8 and Figure 9 The motor moves in the state shown, and then the two windings 4 on the primary core 2 3 are powered off and the two windings 4 on the primary core 1 2 are powered on, and the motor will continue to move.

[0058] In addition, based on the single-phase motor of the present invention, by additionally manufacturing two identical single-phase motor primary structures 1, the two motor primary structures 1 are staggered at a distance of 2τ / 3 in the axial direction, thereby forming an axial three-phase motor, such as Figure 10 、 Figure 11As shown. Since the axial three-phase motor has a three-phase structure, the overall detent force is synthesized from the respective detent forces of the three phases, so the overall detent force will be greatly reduced. On the basis of the three-phase motor, a cooling water channel 10 is provided on the non-magnetic ring 8, as Figure 12 , Figure 13 shown, and a space for placing the cooling water channel 10 is reserved (water channel grooves 9 are opened on both end faces of the non-magnetic ring 8). The cooling water channel 10 adopts a double-channel parallel water channel, and the coolant will flow from one end of the cooling water channel 10 to the other end (Advantages: Cooling the motor by using the cooling water channel 10 can keep the motor at a lower temperature rise state; The water cooling system allows the motor to select a higher electromagnetic load; The parallel water channel is selected for the cooling water channel 10, which has a larger heat dissipation area, a simple structure and is easy to process).

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cylindrical submersible oil horizontal flux permanent magnet linear motor, characterized in that: It includes a motor primary structure (1) and a motor secondary structure (5) both in a cylindrical shape; the motor primary structure (1) includes a primary iron core and four windings (4), and the primary iron core includes a primary iron core one (2) and a primary iron core two (3); the motor secondary structure (5) includes a barrel shaft (12), a secondary iron core and a plurality of permanent magnets (13), and the secondary iron core includes a plurality of secondary iron core ones (7) and a plurality of secondary iron core twos (19); On the inner circular surfaces of the yokes of the primary iron core one (2) and the primary iron core two (3), four primary salient pole teeth (11) are provided. The four primary salient pole teeth (11) are arranged in pairs opposite to each other. The primary iron core one (2) and the primary iron core two (3) are coaxially fixedly connected with each other front and back, and the installation angles differ by 60°. One pair of the primary salient pole teeth (11) of the primary iron core one (2) and the primary iron core two (3) overlap in position, and the other pair of the primary salient pole teeth (11) are staggered in position. Windings (4) are installed on the primary salient pole teeth (11) where the primary iron core one (2) and the primary iron core two (3) are staggered in position; on the outer circular surface of the yoke of each secondary iron core one (7), six secondary salient pole teeth (14) are evenly distributed. On the end face of the yoke of each secondary iron core one (7), four secondary rectangular slots (6) are opened. The four secondary rectangular slots (6) are arranged in pairs opposite to each other. The permanent magnets (13) are embedded in the secondary rectangular slots (6). A plurality of secondary iron core ones (7) and a plurality of secondary iron core twos (19) are arranged alternately in sequence front and back and are coaxially fixedly connected. The six secondary salient pole teeth (14) of the plurality of secondary iron core ones (7) are arranged opposite to each other. The barrel shaft (12) is fixedly equipped with the secondary iron core. The motor primary structure (1) is sleeved outside the secondary iron core. An air gap is provided between the secondary salient pole teeth (14) of the secondary iron core and the primary salient pole teeth (11) of the primary iron core; in the initial position, the primary salient pole teeth (11) of the primary iron core one (2) are aligned with the secondary salient pole teeth (14).

2. The tubular submersible transverse flux permanent magnet linear motor according to claim 1, characterized in that: The primary iron core one (2), the primary iron core two (3), the secondary iron core one (7) and the secondary iron core two (19) are all laminated by silicon steel sheets insulated from each other.

3. A cylindrical submersible transverse flux permanent magnet linear motor according to claim 1 or 2, characterized in that: The magnetic flux path generated by the permanent magnet (13) is: the magnetic flux starts from the N pole of the permanent magnet (13), passes through the yoke of the secondary iron core one (7) to reach the secondary salient pole teeth (14), passes through the air gap between the primary salient pole teeth (11) and the secondary salient pole teeth (14) to reach the primary salient pole teeth (11), then passes through the yoke of the primary iron core to reach another primary salient pole tooth (11) adjacent to the said primary salient pole teeth (11), passes through the air gap and the secondary salient pole teeth (14), and finally returns to the S pole of the permanent magnet (13) via the yoke of the secondary iron core one (7); The magnetic flux circuit generated by the winding (4) is as follows: the magnetic flux starts from the winding (4), passes through the primary salient pole tooth (11) on which the winding (4) is installed and the air gap to reach the secondary salient pole tooth (14), and then splits into two paths. The two paths of magnetic flux pass through two permanent magnets (13) arranged on both sides of the secondary salient pole tooth (14) to reach the secondary salient pole tooth (14) adjacent to the two permanent magnets (13), and then pass through the air gap to reach the primary salient pole tooth (11), and return to the winding (4) through the yoke of the primary iron core (2); The magnetic flux loop generated by the permanent magnet (13) and the magnetic flux loop generated by the winding (4) together constitute the main magnetic flux loop of the motor, and the main magnetic flux loop of the motor is perpendicular to the movement direction of the motor secondary structure (5).

4. A cylindrical submersible oil-lubricated transverse flux permanent magnet linear motor, characterized in that: The invention comprises a motor secondary structure (5) and an m-phase motor primary structure (1), both of which are cylindrical in shape; each single-phase motor primary structure (1) comprises a primary iron core and four windings (4), and the primary iron core comprises a primary iron core 1 (2) and a primary iron core 2 (3); the motor secondary structure (5) comprises a cylindrical shaft (12), a secondary iron core and a plurality of permanent magnets (13), and the secondary iron core comprises a plurality of secondary iron cores 1 (7) and a plurality of secondary iron cores 2 (19); The inner circular surface of the yoke of the primary iron core 1 (2) and the primary iron core 2 (3) is provided with four primary salient pole teeth (11), and the four primary salient pole teeth (11) are arranged opposite to each other in pairs. The primary iron core 1 (2) and the primary iron core 2 (3) are coaxially fixedly connected in front and back, and the installation angles differ by 60 degrees. One pair of the primary salient pole teeth (11) of the primary iron core 1 (2) and the primary iron core 2 (3) are overlapped, and the other pair of the primary salient pole teeth (11) are staggered. The primary iron core 1 (2) and the primary iron core 2 (3) are both installed with windings (4) on the primary salient pole teeth (11) at the staggered positions. The outer circular surface of the yoke of each secondary iron core 1 (7) is provided with six secondary salient pole teeth (14), and the end surface of the yoke of each secondary iron core 1 (7) is provided with four secondary rectangular slots (6). The four secondary rectangular slots (6) are arranged in pairs, the permanent magnets (13) are embedded in the secondary rectangular slots (6), a plurality of secondary cores (7) and a plurality of secondary cores (19) are arranged alternately in front and back and fixedly connected coaxially, the six secondary salient pole teeth (14) of the plurality of secondary cores (7) are arranged opposite each other, the secondary cores are fixedly mounted on the cylindrical shaft (12), the primary structure (1) of the m-phase motor is sleeved on the outer side of the secondary core, an air gap is provided between the secondary salient pole teeth (14) of the secondary core and the primary salient pole teeth (11) of the primary core, and each adjacent two single-phase motor primary structures (1) are staggered by a distance of 2τ / m in the axial direction, τ represents the pole pitch, m represents the number of phases of the motor, and m≥2; in the initial position, the primary salient pole teeth (11) of the primary core (2) are aligned with the secondary salient pole teeth (14).

5. A cylindrical submersible oil horizontal flux permanent magnet linear motor according to claim 4, characterized in that: All primary and secondary cores are made of laminated silicon steel sheets that are insulated from each other.

6. A cylindrical submersible transverse flux permanent magnet linear motor according to claim 4 or 5, characterized in that: The magnetic flux path generated by the permanent magnet (13) is as follows: The magnetic flux starts from the N pole of the permanent magnet (13), reaches the secondary salient pole teeth (14) through the yoke of the first secondary iron core (7), passes through the air gap between the primary salient pole teeth (11) and the secondary salient pole teeth (14) to reach the primary salient pole teeth (11), then passes through the yoke of the primary iron core to reach another primary salient pole teeth (11) adjacent to the primary salient pole teeth (11), passes through the air gap and the secondary salient pole teeth (14), and finally returns to the S pole of the permanent magnet (13) via the yoke of the first secondary iron core (7). The magnetic flux path generated by the winding (4) is as follows: The magnetic flux starts from the winding (4), reaches the secondary salient pole teeth (14) through the primary salient pole teeth (11) where the winding (4) is installed and the air gap, then divides into two paths. The two paths of magnetic flux pass through the two permanent magnets (13) arranged on both sides of the secondary salient pole teeth (14) to reach the secondary salient pole teeth (14) adjacent to the two permanent magnets (13), then pass through the air gap to reach the primary salient pole teeth (11), and return to the winding (4) through the yoke of the first primary iron core (2). The magnetic flux path generated by the permanent magnet (13) and the magnetic flux path generated by the winding (4) together constitute the main magnetic flux path of the motor, and the main magnetic flux path of the motor is perpendicular to the moving direction of the secondary structure (5) of the motor.

7. A cylindrical submersible oil horizontal-flux permanent magnet linear motor according to claim 4, characterized in that: A non-magnetic ring (8) is fixedly installed between every two adjacent primary structures (1) of the single-phase motor. Two water channel grooves (9) are symmetrically arranged on both end faces of the non-magnetic ring (8). Two cooling water channels (10) are fitted in the water channel grooves (9) of multiple non-magnetic rings (8). The two cooling water channels (10) are symmetrically arranged and form a double-channel parallel waterway.

8. A cylindrical submersible oil horizontal-flux permanent magnet linear motor according to claim 7, characterized in that: The cooling water channel (10) is composed of multiple groups of arc-shaped water channels and multiple U-shaped water channels (15). The multiple groups of arc-shaped water channels are arranged in parallel. The number of groups of arc-shaped water channels is the same as the number of non-magnetic rings (8). Each group of arc-shaped water channels includes two arc-shaped water channels (16). One end of the two arc-shaped water channels (16) is connected to both ends of the U-shaped water channel (15), and every two adjacent groups of arc-shaped water channels are connected through the U-shaped water channel (15).

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