Coupling condition magnetic suspension bearing flywheel pulse power device

Abstract

The invention relates to a coupling condition magnetic suspension bearing flywheel pulse power device, which is characterized in that a mandrel is of a hollow structure and is used for supporting the whole flywheel and externally mounting and fixing; the magnetic bearings are installed at the two ends of the mandrel in pairs and used for supporting and rotating flywheel rotating components. The motor / generator is assembled on the mandrel in an interference mode, drives the flywheel body to rotate at a high speed when electric energy is input at the outer end, and provides conventional electric energy for the outside when the flywheel body decelerates. The passive compensation pulse motor is assembled on the mandrel in an interference mode, compensates pulse power generation when the flywheel body decelerates, and releases high-power energy pulses. The flywheel body is wound on the outer sides of the motor / generator and the compensation pulse motor, and the flywheel body and the rotating part of the motor / generator and the passive compensation pulse motor are used for providing rotational inertia and storing energy during high-speed rotation. According to the invention, the requirements of light weight, high energy density / power density and high reliability of the pulse power supply are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of pulse power supplies, and relates to a coupled-condition magnetic levitation bearing flywheel pulse power device. Background Art

[0002] As a new type of high-density pulse power supply, the flywheel compensated pulse power supply integrates rotational inertia energy storage and a compensated pulse motor (CPA). First, three-phase alternating current is input to the motor to drive the flywheel body to a certain speed, realizing the conversion of electrical energy into mechanical energy. Then, by compressing the armature magnetic flux, the transient inductance of the armature winding of the pulse motor is greatly reduced to output a high-power pulse. The single drive energy of the compensated pulse motor accounts for a relatively small proportion of the total flywheel energy storage, enabling short-time continuous firing. By designing the parameters of the compensated motor, various required current waveforms can be easily achieved. As shown in Table 1, in terms of the main technical indicators such as specific power, energy storage density, reliability, and service life, the flywheel energy storage compensated pulse power supply system integrates energy storage and pulse discharge, combining the advantages of large flywheel energy storage density and the light and small size of the CPA system. The typical output voltage ranges from 1 to 10 kV, the discharge peak current can reach the kA to MA level, the pulse width can be as narrow as the μs to ms order of magnitude, and the energy storage density reaches more than 100 kJ / kg. Through series and parallel connections for array expansion, higher power and peak energy output can be achieved without increasing the single unit capacity, especially suitable for use on mobile platforms, and it is one of the most promising solutions for light and small high-power pulse power supplies.

[0003] Table 1 Comparison of the Performance of 3 Typical Pulse Power Supplies

[0004]

[0005] In view of the application requirements of mobile platforms for the light weight, high energy density / power density, and high reliability of high-power pulse power supplies, it is of great significance to develop a flywheel pulse power system that couples energy storage and power generation functions. Summary of the Invention

[0006] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, and proposing a coupled-condition magnetic levitation bearing flywheel pulse power device that can meet the requirements of light weight, high energy density / power density, and high reliability of the pulse power supply.

[0007] The solution to the technical problem of the present invention is: a coupled-condition magnetic levitation bearing flywheel pulse power device, including a core shaft, a magnetic bearing, an electric / generator, a compensated pulse motor, a flywheel body, and a housing assembly;

[0008] The mandrel is of a hollow structure and is used to support the overall flywheel and for external installation and fixation; the magnetic bearings are installed in pairs at both ends of the mandrel and are used to support and rotate the rotating components of the flywheel; the electric / generator is press-fitted onto the mandrel and drives the flywheel body to rotate at high speed when electric energy is input at the outer end, and provides conventional electric energy to the outside when the flywheel body decelerates; the passive compensation pulse motor is press-fitted onto the mandrel and compensates for pulse power generation when the flywheel body decelerates, releases high-power energy pulses, and provides high-power pulses to the outside; the flywheel body is wound around the outside of the electric / generator and the compensation pulse motor, and the rotating parts of the flywheel body, the electric / generator, and the passive compensation pulse motor are used to provide rotational inertia and store energy during high-speed rotation; the housing assembly is used to protect the internal structure of the flywheel.

[0009] Further, the magnetic bearings adopt a hybrid support of permanent magnet unloading and ball bearings.

[0010] Further, the electric / generator includes an electric / generator magnet, an electric / generator shielding cylinder, an electric / generator winding, and an electric / generator stator bracket;

[0011] The electric / generator magnet is in the shape of a tile and is made of samarium cobalt permanent magnet material; the electric / generator shielding cylinder is made of high-conductivity aluminum alloy, and the electric / generator magnet is embedded on the outside of the electric / generator shielding cylinder to form the rotor of the electric / generator, and the flywheel body is wound around the outside of the rotor of the electric / generator;

[0012] The electric / generator winding is of a slotless type and is embedded onto the electric / generator stator bracket by a back-winding method to form the stator of the electric / generator, and the stator of the electric / generator is press-fitted onto the mandrel.

[0013] Further, the compensation pulse motor includes a compensation pulse motor magnet, a compensation pulse motor compensation shielding cylinder, a compensation pulse motor winding, and a compensation pulse motor stator core;

[0014] The compensation pulse motor magnet is in the shape of a tile and is made of samarium cobalt permanent magnet material; the compensation pulse motor compensation shielding cylinder and the electric / generator shielding cylinder are of an integral structure, and the compensation pulse motor magnet is embedded on the outside of the compensation pulse motor compensation shielding cylinder to form the rotor of the passive compensation pulse motor, and the flywheel body is wound around the outside of the rotor of the compensation pulse motor;

[0015] The stator core of the compensation pulse motor is laminated by high-permeability silicon steel sheets. The winding of the compensation pulse motor adopts a two-phase slotless hollow type, and is bonded to the stator core of the compensation pulse motor through an adhesive. After being shaped, the winding of the compensation pulse motor and the stator core of the compensation pulse motor are potted with epoxy resin to form the stator of the compensation pulse motor. The stator of the compensation pulse motor is press-fitted onto the core shaft.

[0016] Furthermore, the flywheel body is a multi-layer composite material, which is successively a glass fiber layer, a high-modulus carbon fiber layer, and a high-modulus carbon fiber layer from the inside to the outside.

[0017] Furthermore, the stator bracket of the motor / generator and the stator core of the compensation pulse motor are coaxially installed and are press-fitted together at both ends of the core shaft.

[0018] Furthermore, the load-bearing capacity of the magnetic bearing is not less than 1 kN, and the rotational speed can reach 30,000 rpm.

[0019] Furthermore, a circular skeleton is designed on the surface of the compensation shield cylinder of the compensation pulse motor to ensure the high-precision circumferential and axial positioning of the permanent magnets.

[0020] Furthermore, the permanent magnets of the compensation pulse motor adopt a Halbach array structure, the windings of the compensation pulse motor are CPA windings wound based on Litz equivalent flat wires, and the stator of the compensation pulse motor adopts a concentric winding arrangement structure with a symmetric current distribution, so that the rotor is uniformly stressed during pulse discharge, achieving a high power density.

[0021] Furthermore, the stator of the motor / generator adopts a slotless and back-winding method, and the rotor of the motor / generator adopts a Halbach array magnetic steel structure.

[0022] The beneficial effects of the present invention compared with the prior art are as follows:

[0023] (1) In the present invention, the magnetic bearing used has a large load-bearing capacity, not less than 1 kN, and the rotational speed can reach 30,000 rpm; the flywheel body adopts a large-size multi-layer composite material structure scheme, and a glass fiber + carbon fiber composite structure is adopted. The elastic modulus gradually increases from the inside to the outside, offsetting part of the interlayer radial stress, preventing deformation, delamination, or even detachment; a circular skeleton is designed on the surface of the shield cylinder to ensure the high-precision circumferential and axial positioning of the permanent magnets. After assembly, the protrusion error on the surface of the permanent magnet is less than 0.1 mm, effectively ensuring the winding quality of the composite carbon fiber forming.

[0024] (2) The compensating pulse motor winding of the present invention uses CPA winding based on Leeds equivalent flat wire winding, which is convenient for shaping traditional flat copper wire under tight constraints; the stator of the motor / generator adopts slotless and back winding methods, and the rotor adopts Halbach array magnetic steel structure to reduce no-load iron loss, length and weight; the compensating pulse motor magnetic steel adopts Halbach array structure, and the stator adopts concentric winding arrangement structure and symmetrical current distribution, which can make the rotor force uniform during pulse discharge and achieve high power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a coupled condition magnetic suspension bearing flywheel pulse power device of the present invention;

[0026] Figure 2 is a schematic diagram of the electric / generator structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the compensation pulse motor of the present invention;

[0028] Figure 4 It is a schematic diagram of the flywheel body structure of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Example 1

[0031] like Figure 1 As shown, the magnetic bearing flywheel pulse power device in this embodiment includes: a core shaft 10, a magnetic bearing 20, a motor / generator 30, a compensating pulse motor 40, a flywheel body 50 and a housing assembly 60. The core shaft 10 is a hollow structure, which is used to support the flywheel as a whole and to be installed and fixed to the outside; the magnetic bearings 20 are installed in pairs at both ends of the core shaft 10, which are used to support and rotate the rotating parts of the flywheel; the electric motor / generator 30 is interference fitted on the core shaft 10, and drives the flywheel body 50 to rotate at high speed when electric energy is input from the outer end, and provides conventional electric energy to the outside when the flywheel body 50 slows down; the passive compensation pulse motor 40 is interference fitted on the core shaft 10, and compensates for pulse power generation when the flywheel body 50 slows down, releases high-power energy pulses, and provides high-power pulses to the outside; the flywheel body 50 is wound around the outside of the electric motor / generator 30 and the compensation pulse motor 40; the rotating parts of the flywheel body 50, the electric motor / generator 30 and the passive compensation pulse motor 40 are used to provide rotational inertia and store energy during high-speed rotation; the shell assembly 60 is used to protect the internal structure of the flywheel.

[0032] Specifically, the magnetic bearing 20 adopts a hybrid support of permanent magnet unloading and ball bearings.

[0033] Specifically, as Figure 2 shown, the motor / generator 30 includes a motor / generator magnet 301, a motor / generator shielding cylinder 302, a motor / generator winding 303, and a motor / generator stator bracket 304. The motor / generator magnet 301 is in the shape of a tile and is made of samarium cobalt permanent magnet material; the motor / generator shielding cylinder 302 is made of high-conductivity aluminum alloy, and the motor / generator magnet 301 is embedded on the outer side of the motor / generator shielding cylinder 302 to form the rotor of the motor / generator 30. The flywheel body 50 is wound around the outer side of the rotor of the motor / generator 30. The motor / generator winding 303 is of a slotless type and is embedded on the motor / generator stator bracket 304 by a back-winding method to form the stator of the motor / generator 30. The stator of the motor / generator is press-fitted onto the core shaft 10.

[0034] Specifically, as Figure 3 shown, the compensation pulse motor 40 includes a compensation pulse motor magnet 401, a compensation pulse motor compensation shielding cylinder 402, a compensation pulse motor winding 403, and a compensation pulse motor stator core 404. The compensation pulse motor magnet 401 is in the shape of a tile and is made of samarium cobalt permanent magnet material; the compensation pulse motor compensation shielding cylinder 402 and the motor / generator shielding cylinder 302 are of an integral structure, and the compensation pulse motor magnet 401 is embedded on the outer side of the compensation pulse motor compensation shielding cylinder 402 to form the rotor of the passive compensation pulse motor 40. The flywheel body 50 is wound around the outer side of the rotor of the compensation pulse motor 40. The compensation pulse motor stator core 404 is laminated from high-permeability silicon steel sheets, and the compensation pulse motor winding 403 is of a two-phase slotless hollow type and is bonded to the compensation pulse motor stator core 404 by an adhesive. After being shaped, the compensation pulse motor winding 403 and the compensation pulse motor stator core 404 are potted with epoxy resin to form the stator of the compensation pulse motor. The stator of the compensation pulse motor 40 is press-fitted onto the core shaft 10.

[0035] Specifically, as Figure 4 shown, the flywheel body 50 is a multi-layer composite material, which is successively a glass fiber layer 501, a high-modulus carbon fiber layer 502, and a high-modulus carbon fiber layer 503 from the inside to the outside.

[0036] Specifically, as Figure 1 shown, the motor / generator stator bracket 304 and the compensation pulse motor stator core 404 are coaxially installed and are jointly press-fitted at both ends of the core shaft 10.

[0037] Specifically, as Figure 1As shown, the electric motor / generator magnet 301 and the compensating pulse motor magnet 401 are installed together on the outside of the integrated electric motor / generator shielding tube 302 and the pulse motor compensating shielding tube 402, and the flywheel body 50 is wound around the outside of the electric motor / generator magnet 301 and the compensating pulse motor magnet 401 to form a complete and independent rotating component.

[0038] Specifically, the shell assembly 60 is made of glass fiber material and adopts a heat sink structure to increase the heat dissipation area and improve the heat dissipation capacity.

[0039] Specifically, the magnetic bearing 20 used in the present invention has a large bearing capacity of not less than 1kN, and a rotation speed of up to 30000rpm; the flywheel body 50 adopts a large-size multi-layer composite material structure, and adopts a glass fiber + carbon fiber composite structure. The elastic modulus gradually increases from the inside to the outside, offsetting part of the radial stress between layers, and preventing deformation, stratification, and even separation; an annular skeleton is designed on the surface of the compensating shielding tube 402 of the compensating pulse motor to ensure high-precision and accurate positioning of the magnetic steel in the circumferential and axial directions. After assembly, the convex error of the magnetic steel surface is less than 0.1mm, which effectively ensures the composite carbon fiber. The compensating pulse motor winding 403 adopts the CPA winding based on the Leeds equivalent flat wire winding, which is convenient for the shaping of traditional flat copper wire under tight constraints; the stator of the electric / generator 30 adopts the slotless and back winding method, and the rotor adopts the Halbach array magnetic steel structure to reduce the no-load iron loss, height and weight; the compensating pulse motor magnetic steel 401 adopts the Halbach array structure, and the stator of the compensating pulse motor 40 adopts the concentric winding arrangement structure and symmetrical current distribution, which can make the rotor force uniform during pulse discharge and achieve high power density.

[0040] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0041] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A coupled condition magnetic suspension bearing flywheel pulse power device, characterized in that: It comprises a core shaft (10), a magnetic bearing (20), a motor / generator (30), a compensating pulse motor (40), a flywheel body (50) and a housing assembly (60); The core shaft (10) is a hollow structure, used for supporting the flywheel as a whole and installing and fixing it to the outside; the magnetic bearings (20) are installed in pairs at both ends of the core shaft (10) for supporting and rotating the rotating parts of the flywheel; the motor / generator (30) is interference-fitted onto the core shaft (10), and drives the flywheel body (50) to rotate at a high speed when electric energy is input from the outer end, and provides conventional electric energy to the outside when the flywheel body (50) is decelerated; the passive compensation pulse motor (40) is interference-fitted onto the core shaft (10), and generates compensation pulse electricity when the flywheel body (50) is decelerated, releases high-power energy pulses, and provides high-power pulses to the outside; the flywheel body (50) is wound around the outer sides of the motor / generator (30) and the compensation pulse motor (40), and the rotating parts of the flywheel body (50), the motor / generator (30), and the passive compensation pulse motor (40) are used to provide rotational inertia and store energy when rotating at a high speed; the housing component (60) is used to protect the internal structure of the flywheel.

2. A coupled condition magnetic suspension bearing flywheel pulse power device according to claim 1, characterized in that: The magnetic bearing (20) adopts a mixed support of permanent magnet unloading and ball bearing.

3. A coupled condition magnetic suspension bearing flywheel pulse power device according to claim 1, characterized in that: The motor / generator (30) comprises a motor / generator magnetic steel (301), a motor / generator shielding cylinder (302), a motor / generator winding (303) and a motor / generator stator bracket (304); The motor / generator magnetic steel (301) is tile-shaped and made of samarium cobalt permanent magnet material; the motor / generator shielding cylinder (302) is made of high-conductivity aluminum alloy; the motor / generator magnetic steel (301) is embedded outside the motor / generator shielding cylinder (302) to form the rotor of the motor / generator (30); the flywheel wheel body (50) is wound around the outside of the rotor of the motor / generator (30); The motor / generator winding (303) is of slotless type and is embedded in the motor / generator stator bracket (304) by back winding to form the stator of the motor / generator (30). The stator of the motor / generator is fitted onto the core shaft (10) by interference fit.

4. A coupled condition magnetic bearing flywheel pulse power device according to claim 3, characterized in that: The compensating pulse motor (40) comprises a compensating pulse motor magnetic steel (401), a compensating pulse motor compensating shielding cylinder (402), a compensating pulse motor winding (403) and a compensating pulse motor stator core (404); The compensating pulse motor magnetic steel (401) is tile-shaped and made of samarium cobalt permanent magnet material; the compensating pulse motor compensating shielding cylinder (402) and the motor / generator shielding cylinder (302) are an integrated structure; the compensating pulse motor magnetic steel (401) is embedded on the outside of the compensating pulse motor compensating shielding cylinder (402) to form the rotor of the passive compensating pulse motor (40); the flywheel wheel body (50) is wound around the outside of the rotor of the compensating pulse motor (40); The compensating pulse motor stator core (404) is formed by laminating high magnetic permeability silicon steel sheets, the compensating pulse motor winding (403) is a two-phase slotless hollow core type, and is bonded to the compensating pulse motor stator core (404) by an adhesive, the compensating pulse motor winding (403) is shaped and then encapsulated with the compensating pulse motor stator core (404) by epoxy resin to form the stator of the compensating pulse motor, and the stator of the compensating pulse motor (40) is fitted onto the core shaft (10) by interference fit.

5. A coupled condition magnetic bearing flywheel pulse power device according to claim 1, characterized in that: The flywheel body (50) is a multi-layer composite material, which comprises, from the inside to the outside, a glass fiber layer (501), a high modulus carbon fiber layer (502) and a high modulus carbon fiber layer (503).

6. A coupled condition magnetic bearing flywheel pulse power device according to claim 4, characterized in that: The motor / generator stator bracket (304) and the compensating pulse motor stator core (404) are coaxially mounted and interference-mounted at both ends of the core shaft (10).

7. A coupled condition magnetic bearing flywheel pulse power device according to claim 1, characterized in that: The bearing capacity of the magnetic bearing (20) is not less than 1 kN, and the rotation speed can reach 30,000 rpm.

8. A coupled condition magnetic bearing flywheel pulse power device according to claim 4, characterized in that: The surface of the compensating pulse motor compensating shielding cylinder (402) is designed with an annular skeleton to ensure high-precision and accurate positioning of the magnetic steel in the circumferential and axial directions.

9. A coupled condition magnetic bearing flywheel pulse power device according to claim 4, characterized in that: The compensating pulse motor magnet (401) adopts a Halbach array structure, the compensating pulse motor winding (403) adopts a CPA winding based on Leeds equivalent flat wire winding, and the stator of the compensating pulse motor (40) adopts a concentric winding arrangement structure and symmetrical current distribution, so that the rotor is evenly stressed during pulse discharge, thereby achieving high power density.

10. A coupled condition magnetic suspension bearing flywheel pulse power device according to claim 3, characterized in that: The stator of the motor / generator (30) adopts a slotless and back-winding method, and the rotor of the motor / generator (30) adopts a Halbach array magnetic steel structure.

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