CN214367288U - Distributed winding type alternating current hybrid magnetic bearing - Google Patents
Distributed winding type alternating current hybrid magnetic bearing Download PDFInfo
- Publication number
- CN214367288U CN214367288U CN202120099721.8U CN202120099721U CN214367288U CN 214367288 U CN214367288 U CN 214367288U CN 202120099721 U CN202120099721 U CN 202120099721U CN 214367288 U CN214367288 U CN 214367288U
- Authority
- CN
- China
- Prior art keywords
- commutator
- stator
- winding
- rotor
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 title claims abstract description 66
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 38
- 239000000725 suspension Substances 0.000 claims abstract description 36
- 230000004907 flux Effects 0.000 claims abstract description 25
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 230000003068 static effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Landscapes
- Motor Or Generator Current Collectors (AREA)
Abstract
The utility model discloses a distributed winding type alternating current hybrid magnetic bearing, three stator suspension teeth and three bias teeth embedded with permanent magnets are distributed on the inner circumference of a stator core, the three suspension teeth are 120 degrees different from each other, and the axis of one suspension tooth is aligned with the + X axis; the three offset teeth are 120 degrees different from each other, and the axis of one offset tooth is aligned with the-X axis; the rotor comprises a rotor iron core and a rotating shaft; 6N rhombic open inner grooves are uniformly distributed on the rotor core along the circumference, and control windings are embedded in the rhombic open inner grooves; one end of each of the two control windings with the phase difference of 180 degrees is in short circuit, and the other end of each of the two control windings is connected with a commutator bar and is connected with a three-phase alternating current power supply through a carbon brush. The utility model provides bias magnetic flux by the permanent magnet and provides control magnetic flux by the control winding which is electrified with three-phase alternating current; the structure increases the effective area between the stator and the rotor, increases the suspension force density, has larger degree of freedom and flexibility, has large variable parameter adjusting room and has the advantage of large bearing capacity.
Description
Technical Field
The utility model relates to a non-mechanical contact magnetic bearing, in particular to a distributed winding type alternating current hybrid magnetic bearing which can be used as a non-contact suspension support of high-speed transmission parts such as a flywheel system, a machine tool electric spindle, a centrifugal machine and the like.
Background
The magnetic bearing is an electromagnetic device which utilizes electromagnetic force to realize no mechanical contact suspension support between a stator and a rotor. The high-speed motor supported by the magnetic bearing can realize higher power and higher rotating speed operation, and has the advantages of no mechanical wear, low power consumption, low noise, long service life, no lubrication, no maintenance and the like. The magnetic bearing can be divided into an active magnetic bearing, a passive magnetic bearing and a hybrid magnetic bearing according to the principle of generating magnetic force by suspension force, compared with the active and passive hybrid magnetic bearings, the hybrid magnetic bearing adopts permanent magnetic materials to generate a bias magnetic field, and control current only provides control magnetic flux for balancing load or interference, thereby reducing the power loss of the magnetic bearing, reducing the volume of the magnetic bearing and improving the suspension force density and the bearing capacity.
The existing hybrid magnetic bearing is that stator teeth are distributed on a stator along the circumference, and concentrated windings are wound on the stator teeth, the design of the windings of the structure relates to the number of turns, the sectional area of a lead, the current density and the like, and the radial space is occupied, the radial magnetic pole area cannot be maximized, and the radial bearing capacity is small. In addition, the air gap flux density of this structure is limited by the saturation of the teeth, and cannot be increased as needed.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a distribution winding formula alternating current hybrid magnetic bearing, stator core do not have the winding, and the winding distributes in the rotor inside groove, has increased the effective area between the stator and the rotor, has increased suspension power density, has great degree of freedom and flexibility, and variable parameter is adjusted leeway greatly, has compact structure's characteristics.
The technical scheme is as follows: the utility model discloses a distribution winding formula alternating current hybrid magnetic bearing, including stator and rotor, the stator includes stator core, the inner periphery interval distribution of stator core has three stator suspension tooth A, B, C and three offset tooth X, Y, Z that inlays the permanent magnet, and the difference is 120 between stator suspension tooth A, B, C, and one of them stator suspension tooth axis aligns with + X axle; offset teeth X, Y, Z are 120 ° apart and one of the offset tooth axes is aligned with the-X axis; the rotor comprises a rotor core and a rotating shaft penetrating through the rotor core, the rotor core is in the shape of a circular disc, 6N rhombic open inner grooves are uniformly distributed along the circumference of the rotor core in a penetrating manner, N is a positive integer greater than or equal to 1, and control windings are embedded in the rhombic open inner grooves; one end of each of two control windings with a 180-degree difference is in short circuit, the other end of each control winding is connected with a commutator segment in the commutator, the number of the commutator segments is equal to that of the grooves in the diamond-shaped opening, and every 2 commutator segments are connected with a three-phase alternating current power supply through a carbon brush; and an air gap is arranged between the rotor core and the stator core.
Furthermore, the commutator comprises a base which is made of insulating materials, a commutator cylinder is arranged on the base, commutator segments are distributed on the surface of the commutator cylinder, the segments are mutually insulated, every two commutator segments are insulated, two ends of each carbon brush are aligned with the outer side positions of the 2 corresponding commutator segments, the chord length width of each carbon brush is equal to the width of the two commutator segments plus the insulation width between the two commutator segments, 6N commutator segments are divided into a U phase, a V phase and a W phase, when the rotor rotates, the positions of the carbon brushes are not moved, the windings are controlled to sequentially enter and leave the phases where the commutator segments are located, the number of the corresponding commutator segments under the carbon brushes is not changed, and each commutator segment is connected with a three-phase alternating current power supply through the corresponding carbon brush.
Further, the insulation width between the commutator segments is equal to the width of the commutator segments.
Further, the radian of the stator suspension tooth A, B, C is less than 80 ℃, the radian of the offset tooth X, Y, Z is less than 40 ℃, the radian of the stator suspension tooth is twice of the radian of the offset tooth, and the air gap offset magnetic flux density under the offset tooth is a saturation valueB sThe air gap bias flux density under the stator suspension tooth is Bs/2。
Further, taking N =2, the rotor core penetrates 12 rhombic open inner grooves uniformly distributed along the circumferential edge of the rotor core, and the control winding R in the 12 rhombic open inner grooves1-R12Control winding R in rhombic open internal groove for suspension control1And R7、R2And R8、R3And R9、R4And R10、R5And R11、R6And R12Respectively connected in series, the other end is connected with a corresponding commutator segment in the commutator and is connected with a control winding R in a rhombic opening inner groove1、R2、R7、R8The 4 commutator segments are U-phase and are connected with a control winding R in the rhombic opening inner groove3、R4、R9、R10The 4 commutator segments are V-phase and are connected with a control winding R in the rhombic opening inner groove5、R6、R11、R12The 4 commutator segments are W phase.
Further, the rhombus opening inner groove control winding R1-R12A three-phase inverter is adopted to provide control current, and when a three-phase alternating current power supply is switched on, a magnetic flux distribution corresponding to the bias magnetic flux is generated.
Furthermore, the stator core and the rotor core are made of a whole piece of magnetic conductive material, and the permanent magnet is made of rare earth permanent magnet material.
Has the advantages that:
the utility model provides a distributed winding formula alternating current hybrid magnetic bearing, the alternating current hybrid magnetic bearing stator core of this structure does not have the winding, and the winding distributes in the rotor inside groove, has increased the effective area between the stator and the rotor, has increased suspension power density, has great degree of freedom and flexibility, and variable parameter is adjusted leeway greatly, has compact structure's characteristics.
Drawings
Fig. 1 is a connection diagram of a distributed winding type ac hybrid magnetic bearing commutator of the present invention;
fig. 2 is a wiring diagram of the distributed winding type ac hybrid magnetic bearing of the present invention;
fig. 3 is a split and suspension magnetic flux diagram of the distributed winding type ac hybrid magnetic bearing of the present invention.
The magnetic field generator comprises a stator core 1, a permanent magnet 2, an air gap 3, a rotor core 4, a static bias magnetic flux 5, a radial suspension control magnetic flux 6, a base 7, a rotating shaft 8, a commutator segment 9 and a carbon brush 10.
Detailed Description
Detailed description of the preferred embodimentsthe present invention discloses a distributed winding ac hybrid magnetic bearing, which comprises a stator and a rotor, as shown in fig. 1-3. The stator comprises a stator core 1, three stator suspension teeth A, B, C and three offset teeth X, Y, Z embedded with permanent magnets 2 are distributed on the inner periphery of the stator core 1, the three stator suspension teeth A, B, C are 120 degrees different from each other, and referring to the attached figure 3, the axis of the stator suspension teeth A is aligned with the axis + X; the three offset teeth X, Y, Z are 120 ° apart from each other, and the offset tooth Y axis is aligned with the-X axis; the radian of the stator suspension teeth A, B, C is twice that of the stator teeth X, Y, Z; the rotor comprises a rotor iron core 4 and a rotating shaft 8 penetrating through the rotor iron core 4; the rotor iron core 4 is in a disc ring shape, 6N rhombic open inner grooves are uniformly distributed on the surface of the rotor iron core along the circumferential edge of the rotor iron core, wherein N is a positive integer greater than or equal to 1, and a control winding is embedded in each rhombic open inner groove; one end of each of two control windings with a 180-degree difference is in short circuit, the other end of each control winding is connected with a commutator segment 9 in the commutator, the number of the commutator segments 9 is equal to that of the grooves in the diamond-shaped opening, and every 2 commutator segments 9 are connected with a carbon brush 10 and then are connected with a three-phase alternating current power supply. An air gap 3 is provided between the rotor core 4 and the stator core 1. The stator core 1 and the rotor core 4 are made of a whole piece of magnetic conductive material. The permanent magnet 2 is made of rare earth permanent magnet material.
In this embodiment, the radian of the stator suspension tooth A, B, C is less than 80 ℃, the radian of the offset tooth X, Y, Z is less than 40 ℃, the radian of the stator suspension tooth is twice the radian of the offset tooth, and the air gap offset magnetic flux density under the offset tooth is a saturation valueB sAir gap bias flux density under the floating tooth is Bs/2。
The commutator comprises a base 7 which is made of insulating materials and provided with a commutator cylinder, commutator segments 9 are distributed on the surface of the commutator cylinder, the segments are insulated from each other, every two commutator segments 9 are insulated from each other, two ends of each carbon brush 10 are aligned with the outer side positions of 2 corresponding commutator segments 9, the chord length width of each carbon brush is equal to the width of the two commutator segments 9 plus the insulation width between the two commutator segments, 6N commutator segments 9 are divided into a U phase, a V phase and a W phase, when a rotor rotates, the positions of the carbon brushes 10 are not changed, windings are controlled to sequentially enter and leave the phases where the commutator segments 9 are located, the number of the corresponding commutator segments 9 under the carbon brushes 10 is not changed, and each commutator segment 9 is connected with a three-phase alternating current power supply through the corresponding carbon brush 10.
The width of the insulation between the segments 9 is equal to the width of the segments 9.
6N diamond-shaped open inner slot windings, in this embodiment, with N =2,namely, 12 are rhombic open inner groove examples, the number of the commutator segments 9 is 12, and the number is marked as a commutator segment c1-c1212 diamond-shaped open inner groove control windings R1-R12For levitation control, in the position shown: control winding R connected in rhombic open inner groove1、R2、R7、R8The commutator segment 9 is U-phase and is connected with a control winding R in a rhombic opening inner groove3、R4、R9、R10The commutator segment 9 is V-phase and is connected with a control winding R in a rhombic opening inner groove5、R6、R11、R12The commutator segment 9 is W phase, and the control winding R in the rhombic opening inner groove1And R7、R2And R8、R3And R9、R4And R10、R5And R11、R6And R12Are respectively connected in series, the other end is connected with a commutator segment 9 in the commutator, and then is connected with a three-phase alternating current power supply through a carbon brush 10. See figure 2 for details of the connections.
U, V, W12 segments 9 are connected to a three-phase power supply via six carbon brushes 10, in the position shown: control winding R3And R4、R9And R10、R1And R2、R7And R8、R5And R6、R11And R12Six carbon brushes 10, which are respectively marked as carbon brushes a-f, are oppositely arranged on the corresponding commutator segment 9, two ends of each carbon brush 10 are aligned with the outer side positions of the corresponding 2 commutator segments 9, and the chord length width of each carbon brush is equal to the width of two commutator segments 9 plus the insulation width between the two commutator segments 9.
Commutator and carbon brush 10 principle: referring to fig. 1, the commutator is disposed on one side of the rotor core 4, one end of the control winding is connected to the segment 9, the segment 9 is fixed to the shaft 8 and rotates with the shaft 8, and the carbon brush a corresponds to the segment c1、c2The carbon brush b corresponds to the commutator segment c3、c4The carbon brush c corresponds to the commutator segment c5、c6D pair of carbon brushesReversing sheet c7、c8Carbon brush e corresponding to commutator segment c9、c10Carbon brush f corresponding to commutator segment c11、c12The carbon brushes are fixed in space, when the rotating shaft 8 rotates, alternating voltage is applied to the ends of the carbon brushes 10, electric energy is transmitted to the control windings through the commutator, and through conversion of the three-phase inverter, current in two control winding sides under each carbon brush 10 can be guaranteed to be always in one direction, and the number of the commutator segments 9 under the carbon brushes 10 is kept unchanged.
When the rotor rotates, the 6 carbon brushes 10 are fixed, the winding is controlled to sequentially enter and leave the phase where the commutator segments 9 are located, and the number of the corresponding commutator segments 9 under the carbon brushes 10 is unchanged.
Rhombus opening internal groove control winding R1-R12A three-phase inverter is adopted to provide control current, and when a three-phase alternating current power supply is switched on, a magnetic flux distribution corresponding to the bias magnetic flux is generated.
The permanent magnet 2 provides a static bias magnetic flux 5, and the magnetic circuit of the static bias magnetic flux 5 is as follows: the magnetic flux starts from the N pole of the permanent magnet 2, the air gap 3, the rotor core 4, the air gap 3, the stator suspension teeth, the stator core 1 and returns to the S pole of the permanent magnet 2.
Rhombus opening internal groove control winding R1-R12The radial suspension control magnetic flux 6 generated by electrifying comprises the following magnetic circuits: stator core 1, air gap 3, rotor core 4, stator core 1 form closed circuit.
Suspension principle: the static bias magnetic flux 5 and the radial suspension control magnetic flux 6 in the radial direction interact with each other, so that the air gap magnetic field on the same side with the radial eccentric direction of the rotor is weakened in superposition, the air gap magnetic field in the opposite direction is strengthened in superposition, a force opposite to the offset direction of the rotor is generated on the rotor, and the rotor is pulled back to the radial balance position.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (7)
1. The distributed winding type alternating-current hybrid magnetic bearing comprises a stator and a rotor, and is characterized in that the stator comprises a stator core (1), three stator suspension teeth A, B, C and three offset teeth X, Y, Z embedded with permanent magnets (2) are distributed on the inner periphery of the stator core (1) at intervals, the stator suspension teeth A, B, C are different by 120 degrees, and the axis of one stator suspension tooth is aligned with the + X axis; offset teeth X, Y, Z are 120 ° apart and one of the offset tooth axes is aligned with the-X axis; the rotor comprises a rotor iron core (4) and a rotating shaft (8) penetrating through the rotor iron core (4), the rotor iron core (4) is in a disc ring shape, 6N rhombic opening inner grooves are uniformly distributed along the circumferential edge of the rotor iron core in a penetrating mode, N is a positive integer larger than or equal to 1, and control windings are embedded in the rhombic opening inner grooves; one end of each of two control windings with a 180-degree difference is in short circuit, the other end of each control winding is connected with a commutator segment (9) in the commutator, the number of the commutator segments (9) is equal to that of the grooves in the diamond-shaped opening, and every 2 commutator segments (9) are connected with a three-phase alternating current power supply after being connected through a carbon brush (10); and an air gap (3) is arranged between the rotor core (4) and the stator core (1).
2. A distributed winding alternating current hybrid magnetic bearing according to claim 1, characterized in that the commutator comprises a base (7), the commutator is made of insulating materials, commutator cylinders are arranged on the commutator cylinders, the commutator segments (9) are distributed on the surfaces of the commutator cylinders, every two commutator segments (9) are insulated, two ends of each carbon brush (10) are aligned with the outer side positions of the corresponding 2 commutator segments (9), the width of the chord length of the commutator segment is equal to the width of two commutator segments (9) and the insulation width between the two commutator segments, 6N commutator segments (9) are divided into a U phase, a V phase and a W phase, when the rotor rotates, the carbon brush (10) is fixed, the winding is controlled to sequentially enter and leave the phase of the commutator segment (9), and the number of the corresponding commutator segments (9) under the carbon brush (10) is unchanged, and each commutator segment (9) is connected with a three-phase alternating current power supply through the corresponding carbon brush (10).
3. A distributed winding alternating current hybrid magnetic bearing according to claim 2, characterized in that the width of the insulation between the segments (9) is equal to the width of the segments (9).
4. The distributed-winding alternating-current hybrid magnetic bearing of claim 1, wherein the stator suspension teeth A, B, C arc is less than 80 degrees, the offset teeth X, Y, Z arc is less than 40 degrees, the arc of the stator suspension teeth is twice the arc of the offset teeth, and the air gap bias flux density at the offset teeth is a saturation valueB sThe air gap bias flux density under the stator suspension tooth is Bs/2。
5. A distributed winding ac hybrid magnetic bearing according to claim 2, characterized in that, taking N =2, the rotor core (4) penetrates along its circumference 12 diamond-shaped open internal slots, the control windings R in the 12 diamond-shaped open internal slots being uniformly distributed, the control windings R in the 12 diamond-shaped open internal slots1-R12Control winding R in rhombic open internal groove for suspension control1And R7、R2And R8、R3And R9、R4And R10、R5And R11、R6And R12Are respectively connected in series, the other end is connected with a corresponding commutator segment (9) in the commutator and is connected with a control winding R in a rhombic opening inner groove1、R2、R7、R8The 4 commutator segments (9) are U-phase and are connected with a control winding R in a rhombic opening inner groove3、R4、R9、R10The 4 commutator segments (9) are V-phase and are connected with a control winding R in a rhombic opening inner groove5、R6、R11、R12The 4 commutator segments (9) are W-phase.
6. The distributed winding ac hybrid magnetic bearing of claim 5, wherein the diamond-shaped open-ended inner slot control winding R1-R12Using a three-phase inverter to provideWhen the three-phase alternating current power supply is electrified, the control current generates a magnetic flux distribution corresponding to the bias magnetic flux.
7. A distributed-winding AC hybrid magnetic bearing according to any one of claims 1 to 6, characterized in that the stator core (1) and the rotor core (4) are made of one piece of magnetically conductive material, and the permanent magnets (2) are made of rare-earth permanent magnet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120099721.8U CN214367288U (en) | 2021-01-14 | 2021-01-14 | Distributed winding type alternating current hybrid magnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120099721.8U CN214367288U (en) | 2021-01-14 | 2021-01-14 | Distributed winding type alternating current hybrid magnetic bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214367288U true CN214367288U (en) | 2021-10-08 |
Family
ID=77955917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120099721.8U Expired - Fee Related CN214367288U (en) | 2021-01-14 | 2021-01-14 | Distributed winding type alternating current hybrid magnetic bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214367288U (en) |
-
2021
- 2021-01-14 CN CN202120099721.8U patent/CN214367288U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7134180B2 (en) | Method for providing slip energy control in permanent magnet electrical machines | |
| CN111049288B (en) | Surrounding type winding magnetic flux modulation stator structure | |
| CN110971095B (en) | Double-stator wind driven generator and power generation system | |
| CN108964396B (en) | Stator partition type alternate pole hybrid excitation motor | |
| CN111181262B (en) | Stator structure using built-in magnetic flux modulation ring of winding | |
| CN101562383B (en) | Single-phase reluctance generator | |
| CN103248158A (en) | Six-phase flux switching type permanent magnet motor | |
| CN110994821B (en) | Magnetic flux modulation stator structure using axial sectional type hysteresis loop | |
| CN106026591A (en) | Hybrid excitation permanent magnet motor with double excitation windings | |
| CN115603536A (en) | Double-stator hybrid excitation flux reverse motor based on direct current bias | |
| CN201188577Y (en) | Single-phase reluctance generator | |
| CN112696431A (en) | Distributed winding type alternating current hybrid magnetic bearing | |
| JP2015029421A (en) | Rotating electrical machine and electric vehicle | |
| CN214788588U (en) | Slotless DC hybrid magnetic bearing | |
| CN214367288U (en) | Distributed winding type alternating current hybrid magnetic bearing | |
| CN114172335B (en) | Stator-partitioned hybrid excitation stator-rotor double permanent magnet vernier motor | |
| JP5650276B2 (en) | Rotor and rotating electric machine equipped with the same | |
| CN109256879A (en) | A kind of Double-stator motor of ectonexine permanent magnet dislocation | |
| CN213602457U (en) | Novel mixed excitation motor stator structure | |
| CN210608875U (en) | Radial magnetic field composite magnetic flux switching motor | |
| CN210629312U (en) | Radial magnetic field composite double-stator motor | |
| CN110808673B (en) | Novel double-stator Halbach alternating pole permanent magnet vernier motor | |
| CN210608876U (en) | Radial magnetic field composite motor | |
| CN110112852B (en) | Double-fed permanent magnet motor | |
| JP4728139B2 (en) | Rotating electric machine using the principle of induction repulsive suction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: HUAI'AN FEMCO STEEL TECHNOLOGY CO.,LTD. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2022980014387 Denomination of utility model: Distributed Winding AC Hybrid Magnetic Bearing Granted publication date: 20211008 License type: Exclusive License Record date: 20220908 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211008 |