CN217055988U - Homopolar permanent magnet bias radial magnetic bearing suitable for flywheel energy storage unit - Google Patents
Homopolar permanent magnet bias radial magnetic bearing suitable for flywheel energy storage unit Download PDFInfo
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- CN217055988U CN217055988U CN202220802011.1U CN202220802011U CN217055988U CN 217055988 U CN217055988 U CN 217055988U CN 202220802011 U CN202220802011 U CN 202220802011U CN 217055988 U CN217055988 U CN 217055988U
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Abstract
A homopolar permanent magnet bias radial magnetic bearing suitable for a flywheel energy storage unit comprises a shell, a stator core, a control coil, a permanent magnet bracket and a magnetic conductive disc; the stator iron core is in interference fit with the shell, an even number of stator tooth parts are arranged on the inner circular surface of the stator iron core, each stator tooth part is a magnetic pole, a control coil is installed, each stator tooth part on the stator iron core is arranged around the flywheel shaft, and an air gap is reserved between each stator tooth part and the flywheel shaft; the magnetic conductive disc is arranged at one end of the stator core, an air gap is reserved between the inner circular surface of the magnetic conductive disc and the flywheel shaft, and the outer circular surface of the magnetic conductive disc is in interference fit with the shell; a permanent magnet bracket is arranged between the magnetic conductive disc and the stator core, the permanent magnets are fixed on the permanent magnet bracket along the circumferential direction to form an equivalent magnetic ring, the number of the permanent magnets is the same as that of the magnetic poles of the stator core, and the mounting positions of the permanent magnets correspond to the positions of the stator tooth parts on the stator core. The rotor has the advantages of reduced rotor loss, short axial dimension, convenient manufacture and low cost.
Description
Technical Field
The utility model belongs to flywheel energy storage system field, concretely relates to homopolar permanent magnetism biasing radial magnetic bearing suitable for flywheel energy storage unit.
Background
The magnetic suspension bearing has the advantages of large bearing capacity, no friction, low power consumption, good temperature resistance and the like, and is very suitable for the application in the field of flywheel energy storage. However, flywheel energy storage systems present technical challenges, and magnetic bearings need to be designed and manufactured adaptively according to the respective requirements.
On one hand, the flywheel energy storage unit runs in a vacuum environment, the heat dissipation of the rotor is difficult, and the heat productivity of the rotor needs to be reduced as much as possible; on the other hand, the length of the flywheel rotor needs to be shortened as much as possible in order to improve the critical rotating speed and the vibration modal frequency of each step of the rotor based on the dynamic consideration; in addition, the flywheel energy storage unit is generally large in size and weight, and the design and manufacture of parts of the flywheel energy storage unit need to consider factors such as cost and manufacturability.
The existing radial magnetic bearing for flywheel energy storage mostly adopts a pure electric magnetic bearing because of the difficulty in assembling large-size permanent magnets, and the eddy current loss and the hysteresis loss of a magnetic bearing rotor are large, so that the heat is serious; the stator and the rotor of the magnetic bearing are designed and manufactured to be similar to a common motor, a multi-pole laminated structure is adopted, special electrical silicon steel is required to be adopted for manufacturing, and the cost is high; and the need to rely on electromagnetic coils to provide the bias magnetic field, resulting in a reduction in the efficiency of the energy storage system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a homopolar permanent magnetism biasing radial magnetic bearing suitable for flywheel energy storage unit has can reduce rotor loss, axial dimensions is short, be convenient for make, advantage with low costs.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a homopolar permanent magnet bias radial magnetic bearing suitable for a flywheel energy storage unit comprises a shell, a stator core, a control coil, a permanent magnet bracket and a magnetic conductive disc; the outer circular surface of the stator core is in interference fit with the inner circular surface of the shell, an even number of stator tooth parts are arranged on the inner circular surface of the stator core at intervals along the circumferential direction, each stator tooth part is a magnetic pole and is provided with a control coil, each stator tooth part on the stator core and the control coil arranged on the stator core are arranged around the flywheel shaft, and an air gap is reserved between each stator tooth part and the flywheel shaft; the magnetic conductive disc is arranged at one end of the stator core and is arranged at an interval with the stator core, an air gap is reserved between the inner circular surface of the magnetic conductive disc and the flywheel shaft, and the outer circular surface of the magnetic conductive disc is in interference fit with the inner circular surface of the shell; the permanent magnet bracket and the permanent magnets are arranged between the magnetic conductive disc and the stator core, the permanent magnets are fixed on the permanent magnet bracket along the circumferential direction to form an equivalent magnetic ring, the number of the permanent magnets is the same as that of the magnetic poles of the stator core, and the installation positions of the permanent magnets correspond to the arrangement positions of the stator tooth parts on the stator core.
The stator core comprises an annular stator yoke portion and a plurality of stator tooth portions, the inner circular surface of the stator yoke portion is provided with a positioning groove used for installing the stator tooth portions, and the stator tooth portions are assembled in the positioning groove and fastened through screws.
And a plurality of threaded holes are formed in the axial end face of the stator yoke at intervals to fix the permanent magnet support.
The stator core is provided with 8 or 4 stator teeth.
After the control coil is installed on the stator tooth part, epoxy resin is filled and sealed on the surface of the coil to coat the control coil.
The permanent magnet support is annular, and a plurality of permanent magnet mounting grooves are uniformly arranged on the outer circular surface of the permanent magnet support at intervals, and a plurality of screw through holes are formed in the permanent magnet support to realize the fixed connection with the stator core.
The permanent magnet is axially magnetized.
The magnetic conductive disc is reserved with a wire passing hole, so that a cable can be conveniently led out from the bearing.
The magnetic conductive disc is also provided with screw avoiding holes to avoid fixing screws for fixing the permanent magnet bracket.
The principle of the utility model is that: and magnetic flux generated by the permanent magnet sequentially passes through the magnetic conductive disc, the air gap between the magnetic conductive disc and the flywheel shaft, the air gap between the flywheel shaft and the stator iron core to form a closed loop.
When the rotor is in a balance position, the magnetic induction intensity of each air gap is equal due to the symmetrical structure, and the electromagnetic resultant force is zero. When the rotor deviates from the balance position, the magnetic bearing controller energizes the control coil according to the eccentric direction and displacement of the rotor obtained by the rotor displacement sensor, so that electric excitation magnetic flux, namely control magnetic flux, is generated in the air gap, the magnetic induction intensity in the air gap is increased or reduced, and electromagnetic resultant force is generated to enable the rotor to return to the balance position.
The utility model has the advantages that: 1. the same-pole structure is adopted, the magnetic field polarity is the same in the circumferential direction in any plane on the flywheel shaft, namely the magnetic flux is not alternating, the corresponding part serving as the rotor on the flywheel shaft almost has no eddy current loss and hysteresis loss, and the heating of the rotor is greatly reduced.
2. The epaxial portion that corresponds as the rotor of flywheel (the epaxial portion that corresponds with stator core of flywheel promptly) need not adopt the same lamination formula structure of electric motor rotor, adopt general magnetic conduction steel can, even need not additionally process a magnetic conduction sleeve, greatly reduced manufacturing cost.
3. The stator core and the permanent magnet ring adopt a split structure, so that the production and the processing are more facilitated, and the cost is saved.
4. The structure of a single stator and a magnetic conductive disc is adopted to ensure that the axial length is as small as possible, thereby being beneficial to improving the critical rotating speed and the vibration modal frequency of the flywheel rotor.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a view taken along line A of FIG. 1;
fig. 3 is a schematic structural diagram of a stator core in the present invention;
fig. 4 is a schematic structural view of a permanent magnet support according to the present invention;
fig. 5 is a schematic structural diagram of a permanent magnet according to the present invention;
fig. 6 is a schematic structural view of the magnetic conductive disk of the present invention;
FIG. 7 is a graph showing the magnetic flux distribution of the bias magnetic field generated by the permanent magnet according to the present invention;
fig. 8 is a magnetic flux distribution diagram of a control magnetic field generated by the control coil according to the present invention;
fig. 9 is a total magnetic flux distribution diagram of the combined bias magnetic field and control magnetic field of the present invention;
the mark in the figure is: 1. the magnetic steel stator comprises a shell, 2, a stator core, 3, a permanent magnet, 4, a permanent magnet support, 5, a magnetic conductive disc, 6, a control coil, 7, a flywheel shaft, 8, a stator yoke, 9, a stator tooth part, 10, a positioning groove, 11, a line passing hole, 12, a threaded hole, 13, a fastening screw, 14, a magnetic steel mounting groove, 15, a screw through hole, 16, an arc surface, 17, a sinking groove, 18 and a screw avoiding hole.
Detailed Description
The following detailed description of the present invention is made with reference to the accompanying drawings and examples, but not to be construed as a limitation of the present invention.
Referring to the attached drawings, the homopolar permanent magnet biased radial magnetic bearing suitable for a flywheel energy storage unit comprises a shell 1, a stator core 2, a permanent magnet 3, a permanent magnet bracket 4, a magnetic conductive disc 5 and a control coil 6.
The shell 1 is made of weak magnetic conductive or non-magnetic conductive alloy steel, such as GH4169 nickel alloy or 316 stainless steel, titanium alloy and the like, so that magnetic leakage can be reduced, on one hand, excitation current is reduced, loss is reduced, and on the other hand, interference on nearby magnetically sensitive parts can be prevented. The housing 1 is sleeved outside the flywheel shaft 7, and the space in the housing 1 is used for mounting the stator core 2, the control coil 6, the permanent magnet 3, the permanent magnet bracket 4 and the magnetic conductive disc 5 of the magnetic bearing.
The stator core 2 is composed of a stator yoke portion 8 and stator teeth 9, and each stator tooth 9 is used as a magnetic pole. Every two magnetic poles can be designed according to a Cartesian coordinate system commonly used in mechanics, measurement and control design of rotor movement and simulation analysis of a mechanical system are all based on the coordinate systems, and the number of the stator teeth 9 is set to be 8 because an 8-pole structure is more favorable for bearing control. The stator yoke part 8 and the stator tooth part 9 are both made of common steel with good magnetic permeability, such as pure iron, 45#, 40Cr and the like. The stator core 2 adopts a split structure of the stator yoke part 8 and the stator tooth part 9, so that the processing is easy and the cost is saved.
The stator yoke part 8 is arranged into a ring shape with a certain height in the axial direction, 8 positioning grooves 10 are uniformly arranged on the inner circular surface of the stator yoke part at intervals along the circumferential direction, fixing holes corresponding to and communicated with the positioning grooves 10 are arranged in the radial direction of the stator yoke part 8, and the fixing holes are opened on the outer circular surface of the stator yoke part 8 and are designed into counter bores; the ends of the stator teeth 9 are fitted in the positioning slots 10, and the stator teeth 9 are provided with screw holes, and fastening screws 13 for fastening the stator teeth 9 are connected to the stator teeth 9 through the fixing holes to fix the stator teeth 9 to the stator yoke 8, thereby constituting a stator core having 8 poles.
The control coil 6 is formed by winding an enameled wire and is arranged on the stator tooth part 9 of the stator core 2, and one control coil 6 is correspondingly arranged on each pole. After the control coil 6 is mounted on the stator core 2, epoxy resin is encapsulated to adapt to operation under vacuum, so as to prevent vacuum discharge.
The permanent magnet support 4 is integrally of an annular structure and is made of non-magnetic aluminum alloy so as to reduce magnetic leakage. For the ease of installation permanent magnet 3, set up a plurality of magnet steel mounting grooves 14 along the circumference interval at the excircle of permanent magnet support 4, 14 numbers in magnet steel mounting groove equal with the magnetic bearing number of poles, right the utility model discloses, set up 8 magnet steel mounting grooves 14, 8 mountable permanent magnets 3. And a screw through hole 15 is formed between the adjacent magnetic steel mounting grooves 14, when the permanent magnet support 4 is mounted, the screw through hole 15 corresponds to the threaded hole 12 formed in the end surface of the stator core 2 in a one-to-one manner, and the permanent magnet support 4 is fixed on the stator core 2 through a fixing screw.
The permanent magnet 3 is made of high-performance neodymium iron boron magnetic steel, is axially magnetized and is bread-shaped, the inner diameter surface of the permanent magnet is matched with the shape of the magnetic steel mounting groove 14, and the outer diameter surface of the permanent magnet is an arc surface 16 matched with the inner wall of the shell 1; the permanent magnet 3 can also be designed in other shapes. N permanent magnets with the same number of poles are arranged in a circle to form an equivalent magnetic ring, so that an axial bias magnetic field is generated. The permanent magnets 3 are arranged on the permanent magnet support 4 at intervals, so that the processing and the assembly are more convenient, and the manufacturing cost is lower.
The magnetic conductive disc 5 is made of common steel with good magnetic conductivity, such as pure iron, 45#, 40Cr and the like. The magnetic conductive disc 5 is sleeved on the flywheel shaft 7 through an inner hole thereof, and the outer circular surface of the magnetic conductive disc 5 is in interference fit with the inner circular surface of the shell. An annular sunken groove 17 is formed in the end face, facing the permanent magnet support 4, of the magnetic conductive disc 5, and a plurality of wire passing holes 11 are formed in the bottom of the sunken groove 17 at intervals in the circumferential direction, so that a cable can be conveniently led out of the bearing. Screw avoiding holes 18 are arranged on one circle of end face at the periphery of the sinking groove 17 at intervals so as to avoid fixing screws for fixing the permanent magnet support 4. The magnetic conductive disk 5 is used for forming an axial magnetic flux loop together with other structural components.
The installation of each structural member in the shell is as follows: the stator iron core 2, the permanent magnet support 4 and the magnetic conductive disc 5 are sleeved on the flywheel shaft 7 along the axial direction, the outer circular surface of the stator iron core 2 is in interference fit with the inner circular surface of the shell 1, an air gap is reserved between the inner circular surface of the stator iron core 2 and the flywheel shaft 7, the aperture of an inner hole of the permanent magnet support 4 is large so as to avoid the control coil 6, and the permanent magnet 3 on the permanent magnet support 4 is in interference fit with the shell 1; an air gap is reserved between the inner circular surface of the magnetic conduction disc 5 and the flywheel shaft 7, the outer circular surface of the magnetic conduction disc is in interference fit with the inner circular surface of the shell 1, and the end surface of the magnetic conduction disc 5 and the end surface of the stator iron core 2 axially position the permanent magnet 3 from two ends of the permanent magnet 3 respectively.
When the flywheel energy storage unit operates, magnetic flux generated by the permanent magnet 3 sequentially passes through the magnetic conductive disc 5, the air gap between the magnetic conductive disc 5 and the flywheel shaft 7, the air gap between the flywheel shaft 7 and the stator iron core 2 to form a closed loop, as shown in fig. 7; when the rotor (flywheel shaft 7) is in a balance position, due to the symmetrical structure, the magnetic induction intensity of each air gap is equal, and the electromagnetic resultant force is zero; when the rotor deviates from the equilibrium position, the magnetic bearing controller will energize the corresponding control coils 6 according to the eccentric direction and displacement of the rotor, thereby generating an electrical excitation flux, i.e. a control flux, in the air gap (as shown in fig. 8), thereby increasing or decreasing the magnetic induction in the air gap, and further generating an electromagnetic resultant force to return the rotor to the equilibrium position, as shown in fig. 9.
The above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and it should be understood by those of ordinary skill in the art that the embodiments of the present invention can be modified or replaced with equivalents with reference to the above embodiments, and any modifications or equivalent substitutions which do not depart from the spirit and scope of the present invention are intended to be covered by the claims which are appended hereto.
Claims (9)
1. A homopolar permanent magnet bias radial magnetic bearing suitable for a flywheel energy storage unit is characterized in that: the permanent magnet motor comprises a shell, a stator core, a control coil, a permanent magnet bracket and a magnetic conductive disc; the outer circular surface of the stator core is in interference fit with the inner circular surface of the shell, an even number of stator tooth parts are arranged on the inner circular surface of the stator core at intervals along the circumferential direction, each stator tooth part is a magnetic pole and is provided with a control coil, each stator tooth part on the stator core and the control coil arranged on the stator core are arranged around the flywheel shaft, and an air gap is reserved between each stator tooth part and the flywheel shaft; the magnetic conductive disc is arranged at one end of the stator core and is arranged at intervals with the stator core, an air gap is reserved between the inner circular surface of the magnetic conductive disc and the flywheel shaft, and the outer circular surface of the magnetic conductive disc is in interference fit with the inner circular surface of the shell; the permanent magnet bracket and the permanent magnets are arranged between the magnetic conductive disc and the stator core, the permanent magnets are fixed on the permanent magnet bracket along the circumferential direction to form an equivalent magnetic ring, the number of the permanent magnets is the same as that of the magnetic poles of the stator core, and the installation positions of the permanent magnets correspond to the arrangement positions of the stator tooth parts on the stator core.
2. The homopolar permanent magnet biased radial magnetic bearing suitable for a flywheel energy storage unit of claim 1, wherein: the stator core comprises an annular stator yoke portion and a plurality of stator tooth portions, the inner circular surface of the stator yoke portion is provided with a positioning groove used for installing the stator tooth portions, and the stator tooth portions are assembled in the positioning groove and fastened through screws.
3. The homopolar permanently biased radial magnetic bearing suitable for use in a flywheel energy storage unit of claim 2, wherein: and a plurality of threaded holes are formed in the axial end face of the stator yoke at intervals to fix the permanent magnet support.
4. The homopolar permanent magnet biased radial magnetic bearing suitable for a flywheel energy storage unit of claim 2, wherein: the stator core is provided with 8 or 4 stator teeth.
5. The homopolar permanent magnet biased radial magnetic bearing suitable for a flywheel energy storage unit of claim 1, wherein: after the control coil is installed on the stator tooth part, epoxy resin is filled and sealed on the surface of the coil to coat the control coil.
6. The homopolar permanently biased radial magnetic bearing suitable for use in a flywheel energy storage unit of claim 1, wherein: the permanent magnet support is annular, and its excircle face evenly sets up a plurality of permanent magnet mounting grooves at interval, is equipped with a plurality of screw via holes on the permanent magnet support to realize with stator core's fixed connection.
7. The homopolar permanently biased radial magnetic bearing suitable for use in a flywheel energy storage unit of claim 1, wherein: the permanent magnet is axially magnetized.
8. The homopolar permanently biased radial magnetic bearing suitable for use in a flywheel energy storage unit of claim 1, wherein: the magnetic conductive disc is reserved with a wire passing hole, so that a cable can be conveniently led out from the bearing.
9. The homopolar permanently biased radial magnetic bearing suitable for use in a flywheel energy storage unit of claim 1, wherein: the magnetic conductive disc is also provided with screw avoiding holes to avoid fixing screws for fixing the permanent magnet bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220802011.1U CN217055988U (en) | 2022-04-07 | 2022-04-07 | Homopolar permanent magnet bias radial magnetic bearing suitable for flywheel energy storage unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220802011.1U CN217055988U (en) | 2022-04-07 | 2022-04-07 | Homopolar permanent magnet bias radial magnetic bearing suitable for flywheel energy storage unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217055988U true CN217055988U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220802011.1U Active CN217055988U (en) | 2022-04-07 | 2022-04-07 | Homopolar permanent magnet bias radial magnetic bearing suitable for flywheel energy storage unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217055988U (en) |
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2022
- 2022-04-07 CN CN202220802011.1U patent/CN217055988U/en active Active
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