A superconducting motor device for induction heating

Abstract

The present invention discloses a superconducting motor device for induction heating, which relates to the technical field of induction heating, including: a stator winding is fixedly arranged on the radial inner side or outer side of the motor stator, and a superconducting rotor assembly is rotatably arranged on the radial inner side or outer side of the stator winding; the central axes of the motor stator, the stator winding, and the superconducting rotor assembly coincide, and a room temperature hole is arranged at the central axis; the stator winding generates a stator magnetic field when alternating current is passed; a workpiece is fixedly placed inside the room temperature hole; the superconducting rotor assembly generates a rotor multipolar magnetic field when direct current is passed, and rotates under the action of the stator magnetic field to obtain a rotating rotor multipolar magnetic field, and induction heating is performed on the workpiece. The present application reduces the volume of the device, simplifies the rotating structure, and improves safety by integrating the induction heating technology and the rotating structure inside the superconducting motor; and improves the adaptability of the workpiece shape by rotating the rotor multipolar magnetic field instead of rotating the workpiece.

Description

Technical Field

[0001] The present application relates to the technical field of induction heating, and in particular to a superconducting motor device for induction heating. Background Art

[0002] With the continuous advancement of industrialization, induction heating has become one of the important methods for hot processing of metal workpieces. The traditional superconducting induction heating device places the workpiece between the two poles of a magnet, applies rotation and translation motion to the workpiece through an external mechanism, forms an induced current inside the workpiece, and thus realizes induction heating.

[0003] In the prior art, Chinese patent CN103313449A discloses an induction heating device and an induction heating method thereof, including a heating device and a rotary drive device. An ingot is arranged in the heating device through the rotary drive device and is driven to rotate and cut the magnetic lines of force formed in the heating device through the rotary drive device. The heating device includes an iron core mechanism with an air gap and a superconducting coil that interacts with the iron core mechanism to form a static magnetic field. The ingot is movably arranged in the air gap through the rotary drive device.

[0004] Since the traditional superconducting induction heating device requires more external auxiliary rotating mechanisms and transmission mechanisms, the device is large in size, the rotating structure is relatively complex, and the safety is poor. However, the above-mentioned prior art has not studied or solved the above-mentioned problems. In addition, the traditional superconducting induction heating device uses the workpiece as a rotating body, which is inconvenient to rotate for square or irregularly shaped workpieces. The above-mentioned prior art has not studied or solved this problem, and the adaptability to the shape of the workpiece is poor. Summary of the invention

[0005] The present application provides a superconducting motor device for induction heating, which is used to solve the problems of existing superconducting induction heating devices, such as large size, complex rotating structure, poor safety, and poor adaptability to workpiece shape.

[0006] In one aspect, the present application provides a superconducting motor device for induction heating, comprising: a motor stator, a stator winding, and a superconducting rotor assembly.

[0007] The stator winding is fixedly arranged on the radial inner side or outer side of the motor stator, and the superconducting rotor assembly is rotatably arranged on the radial inner side or outer side of the stator winding.

[0008] When the stator winding is fixedly arranged on the radial inner side of the motor stator, the superconducting rotor assembly is rotationally arranged on the radial inner side of the stator winding.

[0009] When the stator winding is fixedly arranged on the radial outer side of the motor stator, the superconducting rotor assembly is rotationally arranged on the radial outer side of the stator winding.

[0010] The central axes of the motor stator, the stator winding and the superconducting rotor assembly coincide with each other, and a room temperature hole is arranged at the central axis.

[0011] The stator winding is used to generate a stator magnetic field when alternating current is passed through it.

[0012] The interior of the room temperature hole is used for fixing and placing the workpiece.

[0013] The superconducting rotor assembly is used to generate a rotor multipolar magnetic field inside the room temperature hole when direct current is passed, and is used to rotate under the action of the stator magnetic field to obtain a rotating rotor multipolar magnetic field to induction heat a fixed workpiece.

[0014] In a possible implementation, the superconducting rotor assembly includes: a superconducting pole head assembly, a cooling groove and a vacuum dewar.

[0015] The superconducting pole head assembly is fixedly arranged inside the cooling groove, and the cooling groove is fixedly arranged inside the vacuum dewar.

[0016] The superconducting pole head assembly is used to generate the rotor multi-pole magnetic field inside the room temperature hole when direct current is passed.

[0017] The cooling groove is used to cool the superconducting pole head assembly.

[0018] The vacuum dewar is used to achieve temperature isolation.

[0019] In a possible implementation, the cooling groove is fixedly disposed inside the vacuum dewar through a torque tube.

[0020] In a possible implementation, the superconducting pole head assembly includes: an iron yoke and at least two groups of superconducting coils.

[0021] Each group of superconducting coils is wound on one side of the iron yoke.

[0022] The superconducting coil is used to generate the rotor multipolar magnetic field inside the room temperature hole when direct current is passed.

[0023] In a possible implementation, the superconducting coil is wound with a low-temperature superconducting wire or a high-temperature superconducting wire.

[0024] In a possible implementation, the superconducting rotor assembly supplies power to internal coils via slip rings.

[0025] In a possible implementation, the superconducting rotor assembly is rotatably disposed on the radial inner side or outer side of the stator winding via a rolling bearing.

[0026] In a possible implementation, the stator winding is wound with a conventional wire or a superconducting wire.

[0027] A superconducting motor device for induction heating in the present application has the following advantages:

[0028] By integrating induction heating technology and rotating structure inside the superconducting motor, the size of the device is reduced, which facilitates installation and layout, reduces device costs, simplifies the rotating structure, and improves safety. At the same time, the built-in rotating structure also improves the rotation efficiency. By rotating the rotor multi-pole magnetic field instead of the workpiece, the requirements for the shape of the workpiece are reduced, and it can also be applied to square or irregular-shaped workpieces, thereby improving the adaptability of the workpiece shape.

[0029] The proposed superconducting rotor assembly includes: a superconducting pole head assembly, a cooling groove and a vacuum dewar. The superconducting pole head assembly is cooled by the cooling groove, and the vacuum dewar realizes temperature isolation to prevent the superconducting pole head assembly from quenching, thereby improving the operating stability of the superconducting motor device.

[0030] The proposed superconducting rotor assembly supplies power to the internal coil via a slip ring, thereby avoiding power failure of the superconducting rotor assembly during rotation and improving the working stability of the superconducting rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the axial cross-sectional structure of a superconducting motor device for induction heating provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of a radial cross-sectional structure of a superconducting motor device for induction heating provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the overall structure of a superconducting motor device for induction heating provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1-motor stator, 2-stator winding, 3-vacuum dewar, 4-superconducting pole head assembly, 5-rolling bearing, 6-workpiece, 7-cooling transmission device, 8-slip ring, 9-superconducting rotor assembly, 10-torque tube, 11-cooling groove, 41-iron yoke, 42-superconducting coil. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] like Figures 1 to 3 As shown, an embodiment of the present application provides a superconducting motor device for induction heating, including: a motor stator 1, a stator winding 2 and a superconducting rotor assembly 9.

[0039] The stator winding 2 is fixedly disposed on the radial inner side or outer side of the motor stator 1 , and the superconducting rotor assembly 9 is rotatably disposed on the radial inner side or outer side of the stator winding 2 .

[0040] When the stator winding 2 is fixedly disposed on the radial inner side of the motor stator 1 , the superconducting rotor assembly 9 is rotatably disposed on the radial inner side of the stator winding 2 .

[0041] When the stator winding 2 is fixedly disposed on the radially outer side of the motor stator 1 , the superconducting rotor assembly 9 is rotatably disposed on the radially outer side of the stator winding 2 .

[0042] The central axes of the motor stator 1, the stator winding 2, and the superconducting rotor assembly 9 coincide with each other, and a room temperature hole is provided at the central axis.

[0043] The stator winding 2 is used to generate a stator magnetic field when an alternating current is passed through it.

[0044] The interior of the room temperature hole is used for fixing and placing the workpiece 6 .

[0045] The superconducting rotor assembly 9 is used to generate a rotor multipolar magnetic field inside the room temperature hole when direct current is passed, and is used to rotate under the action of the stator magnetic field to obtain a rotating rotor multipolar magnetic field to induction heat the fixed workpiece 6.

[0046] Specifically, in this embodiment, the stator winding 2 is fixedly disposed on the radial inner side of the motor stator 1 , and the superconducting rotor assembly 9 is rotatably disposed on the radial inner side of the stator winding 2 .

[0047] Exemplarily, the superconducting rotor assembly 9 includes: a superconducting pole head assembly 4 , a cooling groove 11 and a vacuum dewar 3 .

[0048] The superconducting pole head assembly 4 is fixedly disposed inside the cooling groove 11 , and the cooling groove 11 is fixedly disposed inside the vacuum dewar 3 .

[0049] The superconducting pole head assembly 4 is used to generate the rotor multi-pole magnetic field inside the room temperature hole when direct current is passed.

[0050] The cooling groove 11 is used to cool the superconducting pole head assembly 4 .

[0051] The vacuum dewar 3 is used to achieve temperature isolation.

[0052] Specifically, in this embodiment, the cooling tank 11 is connected to a cooling transmission device 7 , and the cooling transmission device 7 is used to pass liquid nitrogen into the cooling tank 11 , so as to cool the superconducting pole head assembly 4 .

[0053] Exemplarily, the cooling tank 11 is fixedly disposed inside the vacuum dewar 3 via a torque tube 10 .

[0054] Specifically, the setting of the torque tube 10 realizes high and low temperature isolation and torque transmission between the cooling tank 11 and the vacuum dewar 3 (the temperature range of the vacuum dewar is generally 300K, and the temperature range of the cooling tank is generally 77K).

[0055] Exemplarily, the superconducting pole head assembly 4 includes: an iron yoke 41 and at least two groups of superconducting coils 42 .

[0056] Each group of superconducting coils 42 is wound on one side of the iron yoke 41 .

[0057] The superconducting coil 42 is used to generate the rotor multipolar magnetic field inside the room temperature hole when direct current is passed.

[0058] Specifically, in this embodiment, four groups of superconducting coils 42 are provided, the iron yoke 41 has four sides, each side corresponds to a group of superconducting coils 42, the central axes of every two adjacent groups of superconducting coils 42 are 90°, the central axes of the four groups of superconducting coils 42 intersect on the central axis of the iron yoke 41, and the rotor multipolar magnetic field in this embodiment is a quadrupole magnetic field. In other possible embodiments, the number of groups of superconducting coils 42 can also be set to 2 groups, 6 groups, 8 groups or other numbers, and the shape of the iron yoke 41 is adapted to the number of groups of superconducting coils 42.

[0059] In this embodiment, the superconducting coil 42 is rectangular in shape, and may be circular or other shapes in other possible embodiments.

[0060] Exemplarily, the superconducting coil 42 is wound with a low-temperature superconducting wire or a high-temperature superconducting wire.

[0061] Specifically, in this embodiment, the superconducting coil 42 is wound with a high temperature superconducting wire.

[0062] Exemplarily, the superconducting rotor assembly 9 supplies power to internal coils via slip rings 8 .

[0063] Specifically, the provision of the slip ring 8 prevents the superconducting rotor assembly 9 from being powered off during rotation, thereby improving the working stability of the superconducting rotor assembly 9 .

[0064] Exemplarily, the superconducting rotor assembly 9 is rotatably disposed on the radial inner side or outer side of the stator winding 2 via a rolling bearing 5 .

[0065] Specifically, in this embodiment, the superconducting rotor assembly 9 is rotatably disposed on the radial inner side of the stator winding 2 via the rolling bearing 5. The arrangement of the rolling bearing 5 facilitates the superconducting rotor assembly 9 to rotate on the radial inner side of the stator winding 2, thereby reducing energy loss.

[0066] Exemplarily, the stator winding 2 is wound with a conventional wire or a superconducting wire.

[0067] Specifically, in this embodiment, the stator winding 2 is wound with a normal conductor.

[0068] In this embodiment, after the superconducting coil 42 and the stator winding 2 are wound, they are both cured by a curing agent to increase the structural strength. The superconducting coil 42 is cured by a curing agent so that it is not easy to fall off or misalign during the rotation of the superconducting pole head assembly 4, thereby improving the rotation stability.

[0069] Specifically, in this embodiment, the working process of a superconducting motor device for induction heating is as follows:

[0070] The workpiece 6 is placed inside the room temperature hole of the superconducting motor device; liquid nitrogen is introduced into the cooling tank 11 through the cooling transmission device 7 to cool the superconducting coil 42 of the superconducting pole head assembly 4 to a superconducting state; alternating current is supplied to the stator winding 2 to generate a stator magnetic field, and direct current is supplied to the superconducting coil 42 of the superconducting pole head assembly 4 of the superconducting rotor assembly 9 through the slip ring 8 to generate a rotor multipolar magnetic field (a quadrupole magnetic field in this embodiment) inside the room temperature hole; the superconducting rotor assembly 9 rotates under the action of the stator magnetic field, so that the rotor multipolar magnetic field also rotates, and the rotating rotor multipolar magnetic field cuts the magnetic flux lines of the workpiece 6, generates an induced current inside the workpiece 6, and thus realizes induction heating of the workpiece 6.

[0071] The embodiment of the present application reduces the size of the device by integrating the induction heating technology and the rotating structure inside the superconducting motor, facilitates installation and layout, reduces the cost of the device, simplifies the rotating structure, and improves safety. At the same time, the built-in rotating structure also improves the rotation efficiency. By rotating the rotor multi-pole magnetic field instead of rotating the workpiece 6, the shape requirements of the workpiece 6 are reduced, and it can also be applied to square or irregularly shaped workpieces 6, thereby improving the adaptability of the workpiece shape.

[0072] The proposed superconducting rotor assembly 9 includes: a superconducting pole head assembly 4, a cooling groove 11 and a vacuum dewar 3. The superconducting pole head assembly 4 is cooled by the cooling groove 11, and the vacuum dewar 3 realizes temperature isolation to prevent the superconducting pole head assembly 4 from quenching, thereby improving the operating stability of the superconducting motor device.

[0073] The proposed superconducting rotor assembly 9 supplies power to the internal coils via the slip ring 8 , thereby avoiding power failure of the superconducting rotor assembly 9 during rotation and improving the working stability of the superconducting rotor assembly 9 .

[0074] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0075] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A superconducting motor device for induction heating, characterized in that: include: Electric motor stators, stator windings and superconducting rotor assemblies; The stator winding is fixedly arranged on the radial inner side or outer side of the motor stator, and the superconducting rotor assembly is rotatably arranged on the radial inner side or outer side of the stator winding; When the stator winding is fixedly arranged on the radial inner side of the motor stator, the superconducting rotor assembly is rotatably arranged on the radial inner side of the stator winding; When the stator winding is fixedly arranged on the radial outer side of the motor stator, the superconducting rotor assembly is rotatably arranged on the radial outer side of the stator winding; The central axes of the motor stator, the stator winding, and the superconducting rotor assembly coincide with each other, and a room temperature hole is provided at the central axis; The stator winding is used to generate a stator magnetic field when an alternating current is passed; The interior of the room temperature hole is used to fix and place the workpiece; The superconducting rotor assembly is used to generate a rotor multipolar magnetic field inside the room temperature hole when direct current is passed, and is used to rotate under the action of the stator magnetic field to obtain a rotating rotor multipolar magnetic field to induction heat the stationary workpiece; The superconducting rotor assembly comprises: a superconducting pole head assembly, a cooling groove and a vacuum dewar; The superconducting pole head assembly is fixedly arranged inside the cooling groove, and the cooling groove is fixedly arranged inside the vacuum dewar; The superconducting pole head assembly is used to generate the rotor multipolar magnetic field inside the room temperature hole when direct current is passed; The cooling groove is used to cool the superconducting pole head assembly; The vacuum dewar is used to achieve temperature isolation; The cooling groove is fixedly arranged inside the vacuum dewar through a torque tube; The superconducting rotor assembly supplies power to the internal coils via slip rings; The superconducting pole head assembly comprises: an iron yoke and at least two groups of superconducting coils; Each group of superconducting coils is wound on one side of the iron yoke; The superconducting coil is used to generate the rotor multipolar magnetic field inside the room temperature hole when direct current is passed.

2. A superconducting motor device for induction heating according to claim 1, characterized in that: The superconducting coil is wound with a low-temperature superconducting wire or a high-temperature superconducting wire.

3. A superconducting motor device for induction heating according to claim 1, characterized in that: The superconducting rotor assembly is rotatably arranged on the radial inner side or outer side of the stator winding via a rolling bearing.

4. A superconducting motor device for induction heating according to claim 1, characterized in that: The stator winding is wound with a conventional wire or a superconducting wire.

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