CN111525746A - Direct current motor rotor provided with PCB plate capacitor assembly - Google Patents
Direct current motor rotor provided with PCB plate capacitor assembly Download PDFInfo
- Publication number
- CN111525746A CN111525746A CN201910152661.9A CN201910152661A CN111525746A CN 111525746 A CN111525746 A CN 111525746A CN 201910152661 A CN201910152661 A CN 201910152661A CN 111525746 A CN111525746 A CN 111525746A
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- armature
- pcb board
- rotor
- capacitor assembly
- pcb
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
- H02K11/028—Suppressors associated with the rotor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
Abstract
The invention discloses a direct current motor rotor provided with a PCB plate capacitor assembly, which comprises a magnetic yoke, wherein an armature core is arranged in the magnetic yoke, a rotor shaft is arranged on the armature core, a plurality of armature teeth are arranged on the armature core, the armature teeth are distributed in an annular array, an armature slot is formed between every two armature teeth, an armature winding is arranged in each armature slot, four main pole iron cores and four commutating pole iron cores are respectively arranged on the inner side of the magnetic yoke, the four main pole iron cores and the four commutating pole iron cores are distributed in an annular array, and a commutating pole winding is arranged on each commutating pole iron core. According to the invention, through the matching work of the plurality of PCBs and the capacitor, when the motor is in a large-current working state, the sudden-change current is absorbed by the capacitor through the PCBs, so that the electromagnetic interference of the motor rotor is avoided, the service life is prolonged, and the PCB and the mounting plate are connected through the mounting screws, and the later-stage disassembly and maintenance are more convenient.
Description
Technical Field
The invention relates to the technical field of motor rotors, in particular to a direct current motor rotor provided with a PCB plate capacitor assembly.
Background
A dc motor is a motor that converts dc electrical energy into mechanical energy. The speed-regulating device is widely applied to electric traction due to good speed-regulating performance. The dc motor is classified into permanent magnet, separately excited and self-excited 3 types according to the excitation mode.
A motor rotor: also a rotating part in the motor. The motor consists of a rotor and a stator, is a conversion device for realizing electric energy and mechanical energy and electric energy, and the rotor of the motor is divided into an inner rotor rotation mode and an outer rotor rotation mode. The inner rotor rotates in such a way that a core body in the middle of the motor is a rotating body, and torque (referred to as a motor) is output or energy is input (referred to as a generator). The outer rotor rotation mode is that the motor outer body is used as a rotating body, and different modes are convenient for application in various occasions.
The traditional direct current motor rotor has limited capacity of inhibiting and absorbing sudden change current through a piezoresistor, the service life of the direct current motor rotor can be obviously shortened due to larger electromagnetic interference of the motor when the motor power faces large current, and the rotor shaft is easy to damage under the condition of external force when not in use.
Disclosure of Invention
The invention aims to solve the defects in the prior art, such as: the traditional direct current motor rotor has limited capability of resisting electromagnetic interference, the service life of the direct current motor rotor can be obviously prolonged due to the larger electromagnetic interference of the motor when the power of a large-current motor is faced, and a rotor shaft is easy to damage under the condition of external force when not used, so that the direct current motor rotor provided with a PCB (printed circuit board) plate capacitor assembly is provided for solving the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a direct current motor rotor provided with a PCB plate capacitor component comprises a magnet yoke, wherein an armature core is arranged in the magnet yoke, a rotor shaft is arranged on the armature core, a plurality of armature teeth are arranged on the armature core and distributed in an annular array, an armature groove is formed between every two armature teeth, an armature winding is arranged in each armature groove, four main pole iron cores and four commutating pole iron cores are respectively arranged on the inner side of the magnet yoke, the four main pole iron cores and the four commutating pole iron cores are distributed in the annular array, each commutating pole iron core is provided with a commutating pole winding, an excitation winding is arranged on each main pole iron core, fixing lugs are symmetrically and fixedly connected to the bottom side of the magnet yoke, a supporting device is arranged on each fixing lug, a sleeve is arranged on the magnet yoke, a protective sleeve is sleeved on the rotor shaft, and a commutator is arranged at one end, away from the protective sleeve, of the rotor shaft, the commutator is fixedly provided with a mounting plate, the mounting plate is provided with a PCB, and the PCB is provided with a plurality of capacitors.
Preferably, the supporting device comprises a foot, the foot is connected with the fixing lug through a plurality of fixing screws, a balancing weight is arranged in the foot, a cushion pad is fixedly connected to the bottom side of the foot, and anti-skid grains are arranged on the cushion pad.
Preferably, the protective sleeve is provided with an adsorption magnet, the sleeve is provided with a ferromagnetic sheet, and the ferromagnetic sheet and the adsorption magnet are matched.
Preferably, a plurality of through holes are formed in the PCB, threaded holes are formed in the mounting plate, the through holes correspond to the threaded holes one to one, and the PCB is fixedly connected with the mounting plate through mounting screws.
Preferably, each be equipped with between mounting screw and the PCB board and play pad and flat the pad, flat the pad is located the one side that is close to the PCB board.
Preferably, the capacitor corresponds to the number and position of the rotor coils, and the capacitor is connected in parallel with the rotor coils.
Preferably, a sealing layer is arranged at the joint of the sleeve and the magnetic yoke, and the sealing layer is an epoxy resin sealing layer.
Preferably, the mounting plate is bonded with the PCB plate through an adhesive layer.
Compared with the prior art, the invention has the beneficial effects that:
1. the cooperation through the symmetry footing makes the yoke daily place more stable to owing to set up the balancing weight and reduce the holistic focus of device, stability further strengthens, and buffering and anti-skidding function are guaranteed in the setting of blotter, and owing to be fixed for a plurality of set screw's cooperation equipment, make the later stage dismantle more convenient.
2. Through the cooperation work of a plurality of PCB boards and condenser for the motor is when being faced heavy current operating condition, and sudden change electric current is absorbed by the condenser when arriving through the PCB board, thereby has avoided electric motor rotor's electromagnetic interference, reinforcing life, and it is more convenient that PCB board and mounting panel are connected the later stage through the construction screw and are dismantled the maintenance.
3. Through setting up flat pad increase atress area of contact to the packing force that PCB board was given to the dispersion installation screw avoids causing the crushing to the PCB board, and the elastic cushion atress takes place to give a reaction elasticity of installation screw after the deformation simultaneously, and the frictional force between increase installation screw and the screw hole prevents droing of installation screw, guarantees fixed effect.
4. When the rotor shaft is not used in daily idle position, the protective sleeve can be sleeved on the rotor shaft, so that the adsorption magnet and the ferromagnetic sheet are adsorbed to each other, the protective sleeve is butted with the sleeve, and the exposed rotor shaft is well isolated and protected.
Drawings
Fig. 1 is a schematic view of an internal structure of a dc motor rotor provided with a PCB board capacitor assembly according to an embodiment of the present invention;
fig. 2 is a schematic external top view of a dc motor rotor with a PCB board capacitor assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a screw for mounting a DC motor rotor with a PCB board capacitor assembly according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of the structure at A in FIG. 2;
fig. 5 is a schematic external top view of a dc motor rotor with a PCB board capacitor assembly according to the second embodiment of the present invention.
In the figure: 1-magnetic yoke, 2-main magnetic pole iron core, 3-excitation winding, 4-commutation pole iron core, 5-commutation pole winding, 6-armature iron core, 7-armature slot, 8-armature winding, 9-fixing lug, 10-foot, 11-counterweight block, 12-buffer pad, 13-fixing screw, 14-epoxy resin sealing layer, 15-sleeve, 16-protective sleeve, 17-rotor shaft, 18-commutator, 19-mounting plate, 20-PCB plate, 21-mounting screw, 22-capacitor, 23-elastic pad, 24-flat pad, 25-ferromagnetic sheet, 26-adsorption magnet and 27-adhesive layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example one
Referring to fig. 1-4, a dc motor rotor with a PCB strip capacitor assembly includes a yoke 1, an armature core 6 is disposed in the yoke 1, a rotor shaft 17 is disposed on the armature core 6, a plurality of armature teeth are disposed on the armature core 6, the plurality of armature teeth are distributed in an annular array, an armature slot 7 is disposed between each two armature teeth, an armature winding 8 is disposed in each armature slot 7, four main pole cores 2 and four commutating pole cores 4 are disposed inside the yoke 1, the four main pole cores 2 and the four commutating pole cores 4 are distributed in an annular array, a commutating pole winding 5 is disposed on each commutating pole core 4, an excitation winding 3 is disposed on each main pole core 2, fixing lugs 9 are symmetrically and fixedly connected to the bottom side of the yoke 1, a supporting device is disposed on the fixing lugs 9, the supporting device includes a foot 10, the foot 10 is connected to the fixing lugs 9 by a plurality of fixing screws 13, be equipped with balancing weight 11 in the footing 10, footing 10 bottom side fixed connection blotter 12, be equipped with anti-skidding line on the blotter 12, cooperation through symmetry footing 10 makes 1 daily placing of yoke more stable to owing to set up balancing weight 11 and reduce the holistic focus of device, stability further strengthens, buffering and anti-skidding function are guaranteed in setting up of blotter 12, and owing to be fixed for the cooperation equipment of a plurality of set screws 13, it is more convenient to make the later stage dismantle.
Be equipped with sleeve pipe 15 on yoke 1, be equipped with the sealing layer on sleeve pipe 15 and the yoke 1 junction, the sealing layer is epoxy sealing layer 14, guarantee the leakproofness, sleeve pipe 15 can prevent rotor shaft 17 to take place the bending phenomenon to a certain extent simultaneously, the cover is equipped with protective sheath 16 on the rotor shaft 17, be equipped with absorption magnetite 26 on the protective sheath 16, be equipped with ferromagnetic sheet 25 on the sleeve pipe 15, ferromagnetic sheet 25 cooperatees with absorption magnetite 26 and sets up, rotor shaft 17 when daily vacant not using, can overlap protective sheath 16 on rotor shaft 17, thereby let absorption magnetite 26 and ferromagnetic sheet 25 adsorb each other and let protective sheath 16 and sleeve pipe 15 accomplish the butt joint, thereby play better isolation protection to naked rotor shaft 17.
The end of the rotor shaft 17 far away from the protective sleeve 16 is provided with a commutator 18, a mounting plate 19 is fixedly mounted on the commutator 18, a PCB 20 is arranged on the mounting plate 19, a plurality of capacitors 22 are arranged on the PCB 20, the number and the positions of the capacitors 22 correspond to those of the rotor coils, the capacitors 22 are connected with the rotor coils in parallel, and through the matching work of the plurality of PCBs 20 and the capacitors 22, when the motor is in a large-current working state, the sudden current is absorbed by the capacitors 22 through the PCB 20 in time, so that the electromagnetic interference of the rotor of the motor is avoided, the service life is prolonged, the PCB 20 is provided with a plurality of through holes, the mounting plate 19 is provided with threaded holes, the plurality of through holes correspond to the plurality of threaded holes one by one, the PCB 20 is fixedly connected with the mounting plate 19 through mounting screws 21, and the PCB 20 is connected with the mounting plate 19 through the mounting screws 21, all be equipped with between every installation screw 21 and the PCB board 20 and play pad 23 and flat pad 24, flat pad 24 is located the one side that is close to PCB board 20, through setting up flat pad 24 increase atress area of contact, thereby the packing force that PCB board 20 was given to dispersion installation screw 21, avoid causing the crushing to PCB board 20, play pad 23 atress takes place to give 21 a reaction elasticity of installation screw after the deformation simultaneously, increase the frictional force between installation screw 21 and the screw hole, prevent droing of installation screw 21, guarantee fixed effect.
In the invention, the working principle is as follows: through the cooperation of the plurality of PCBs 20 and the capacitor 22, when the motor is in a working state facing a large current, the sudden change current is absorbed by the capacitor 22 through the PCBs 20 in time, thereby avoiding the electromagnetic interference of a motor rotor, prolonging the service life, and the PCBs 20 and the mounting plate 19 are connected through the mounting screws 21, the later-stage disassembly and maintenance are more convenient, the magnetic yoke 1 is more stably placed in daily life through the cooperation of the symmetrical bottom feet 10, the gravity center of the whole device is reduced due to the arrangement of the balancing weight 11, the stability is further enhanced, the buffering and anti-skidding functions are ensured due to the arrangement of the buffering cushion 12, the later-stage disassembly is more convenient due to the cooperation, assembly and fixation of the plurality of fixing screws 13, when the PCBs 20 are mounted, the mounting screws 21 penetrate through the through holes to be screwed into the corresponding threaded holes, the stress contact area is increased through the arrangement of the, avoid causing the crushing to PCB board 20, simultaneously bullet pad 23 atress takes place to give installation screw 21 a reaction elasticity after the deformation, increase the frictional force between installation screw 21 and the screw hole, prevent droing of installation screw 21, guarantee fixed effect, rotor shaft 17 when daily vacant does not use, can overlap protective sheath 16 on rotor shaft 17, thereby let adsorb magnetite 26 and ferromagnetic sheet 25 and adsorb each other and let protective sheath 16 and sleeve pipe 15 accomplish the butt joint, thereby play better isolation guard action to naked rotor shaft 17.
Example two
Referring to fig. 5, a dc motor rotor with a PCB strip capacitor assembly includes a yoke 1, an armature core 6 is disposed in the yoke 1, a rotor shaft 17 is disposed on the armature core 6, a plurality of armature teeth are disposed on the armature core 6, the plurality of armature teeth are distributed in an annular array, an armature slot 7 is disposed between every two armature teeth, an armature winding 8 is disposed in each armature slot 7, four main pole cores 2 and four commutating pole cores 4 are disposed on an inner side of the yoke 1, the four main pole cores 2 and the four commutating pole cores 4 are distributed in an annular array, a commutating pole winding 5 is disposed on each commutating pole core 4, an excitation winding 3 is disposed on each main pole core 2, fixing lugs 9 are symmetrically and fixedly connected to a bottom side of the yoke 1, a supporting device is disposed on the fixing lugs 9, the supporting device includes a foot 10, the foot 10 is connected to the fixing lugs 9 by a plurality of fixing screws 13, be equipped with balancing weight 11 in the footing 10, footing 10 bottom side fixed connection blotter 12, be equipped with anti-skidding line on the blotter 12, cooperation through symmetry footing 10 makes 1 daily placing of yoke more stable to owing to set up balancing weight 11 and reduce the holistic focus of device, stability further strengthens, buffering and anti-skidding function are guaranteed in setting up of blotter 12, and owing to be fixed for the cooperation equipment of a plurality of set screws 13, it is more convenient to make the later stage dismantle.
Be equipped with sleeve pipe 15 on yoke 1, be equipped with the sealing layer on sleeve pipe 15 and the yoke 1 junction, the sealing layer is epoxy sealing layer 14, guarantee the leakproofness, sleeve pipe 15 can prevent rotor shaft 17 to take place the bending phenomenon to a certain extent simultaneously, the cover is equipped with protective sheath 16 on the rotor shaft 17, be equipped with absorption magnetite 26 on the protective sheath 16, be equipped with ferromagnetic sheet 25 on the sleeve pipe 15, ferromagnetic sheet 25 cooperatees with absorption magnetite 26 and sets up, rotor shaft 17 when daily vacant not using, can overlap protective sheath 16 on rotor shaft 17, thereby let absorption magnetite 26 and ferromagnetic sheet 25 adsorb each other and let protective sheath 16 and sleeve pipe 15 accomplish the butt joint, thereby play better isolation protection to naked rotor shaft 17.
One end of rotor shaft 17 far away from protective sheath 16 is equipped with commutator 18, fixed mounting has mounting panel 19 on commutator 18, be equipped with PCB board 20 on the mounting panel 19, be equipped with a plurality of condensers 22 on the PCB board 20, condenser 22 is corresponding with rotor coil quantity and position, condenser 22 and rotor coil parallel connection, cooperation work through a plurality of PCB boards 20 and condenser 22, make the motor when facing heavy current operating condition, the sudden change electric current passes through PCB board 20 and is in time absorbed by condenser 22, thereby motor rotor's electromagnetic interference has been avoided, and service life is prolonged, mounting panel 19 bonds with PCB board 20 through adhesive layer 27, installation through this kind of connected mode PCB board 20 saves time more fast, need not to trompil on mounting panel 19 and PCB board 20, the installation is simple, required accessory still less, the cost is lower, it is inseparabler to connect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A direct current motor rotor provided with a PCB plate capacitor assembly comprises a magnetic yoke (1) and is characterized in that an armature core (6) is arranged in the magnetic yoke (1), a rotor shaft (17) is arranged on the armature core (6), a plurality of armature teeth are arranged on the armature core (6), the armature teeth are distributed in an annular array, an armature slot (7) is formed between every two armature teeth, an armature winding (8) is arranged in each armature slot (7), four main pole iron cores (2) and four commutating pole iron cores (4) are respectively arranged on the inner side of the magnetic yoke (1), the four main pole iron cores (2) and the four commutating pole iron cores (4) are distributed in an annular array, a commutating pole winding (5) is arranged on each commutating pole iron core (4), an excitation winding (3) is arranged on each main pole iron core (2), yoke (1) bottom side symmetry fixedly connected with fixes ear (9), be equipped with strutting arrangement on fixed ear (9), be equipped with sleeve pipe (15) on yoke (1), the cover is equipped with protective sheath (16) on rotor shaft (17), the one end that protective sheath (16) were kept away from in rotor shaft (17) is equipped with commutator (18), fixed mounting has mounting panel (19) on commutator (18), be equipped with PCB board (20) on mounting panel (19), be equipped with a plurality of condenser (22) on PCB board (20).
2. The rotor of a direct current motor with a PCB board capacitor assembly as claimed in claim 1, wherein the supporting device comprises a foot (10), the foot (10) is connected with a fixing lug (9) through a plurality of fixing screws (13), a balancing weight (11) is arranged in the foot (10), a cushion pad (12) is fixedly connected to the bottom side of the foot (10), and anti-skid lines are arranged on the cushion pad (12).
3. A dc motor rotor with a PCB board capacitor assembly according to claim 1, wherein the protective sleeve (16) is provided with a magnet (26), the sleeve (15) is provided with a ferromagnetic sheet (25), and the ferromagnetic sheet (25) is matched with the magnet (26).
4. The direct current motor rotor provided with the PCB plate capacitor assembly as claimed in claim 1, wherein a plurality of through holes are formed in the PCB plate (20), threaded holes are formed in the mounting plate (19), the through holes correspond to the threaded holes one by one, and the PCB plate (20) is fixedly connected with the mounting plate (19) through mounting screws (21).
5. A rotor of a DC motor with a PCB board capacitor assembly according to claim 4, characterized in that an elastic pad (23) and a flat pad (24) are arranged between each mounting screw (21) and the PCB board (20), and the flat pad (24) is positioned at one side close to the PCB board (20).
6. A dc motor rotor with a PCB board capacitor assembly according to claim 1, wherein the capacitors (22) correspond to the number and location of the rotor coils, and the capacitors (22) are connected in parallel with the rotor coils.
7. The direct current motor rotor provided with the PCB board capacitor assembly according to claim 1, characterized in that a sealing layer is arranged on the joint of the sleeve (15) and the magnetic yoke (1), and the sealing layer is an epoxy resin sealing layer (14).
8. A dc motor rotor with a PCB board capacitor assembly according to claim 1, wherein the mounting plate (19) is glued to the PCB board (20) by means of an adhesive layer (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910152661.9A CN111525746A (en) | 2019-02-28 | 2019-02-28 | Direct current motor rotor provided with PCB plate capacitor assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910152661.9A CN111525746A (en) | 2019-02-28 | 2019-02-28 | Direct current motor rotor provided with PCB plate capacitor assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111525746A true CN111525746A (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910152661.9A Pending CN111525746A (en) | 2019-02-28 | 2019-02-28 | Direct current motor rotor provided with PCB plate capacitor assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111525746A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003065323A (en) * | 2001-08-27 | 2003-03-05 | Nippon Densan Corp | Hydrodynamic bearing apparatus and electric motor using the same |
| CN203416142U (en) * | 2013-08-17 | 2014-01-29 | 赣州三进特种漆包线有限公司 | DC brushless motor using enameled aluminum wires as windings |
| CN205029448U (en) * | 2015-08-21 | 2016-02-10 | 芜湖环球汽车配件有限公司 | Novel direct -current motor |
| CN205402447U (en) * | 2016-03-14 | 2016-07-27 | 济南安居智能科技有限公司 | Dustproof LED ceiling lamp of easily maintaining |
| CN205647216U (en) * | 2016-05-05 | 2016-10-12 | 愈富制造（河源）有限公司 | Continuous current motor |
| CN206775330U (en) * | 2016-11-01 | 2017-12-19 | 蔡甫寒 | DC motor commutator suppression electromagnetic interference structure |
| WO2018032739A1 (en) * | 2016-08-15 | 2018-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Protective structure for magnetic bearing and magnetic bearing assembly |
-
2019
- 2019-02-28 CN CN201910152661.9A patent/CN111525746A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003065323A (en) * | 2001-08-27 | 2003-03-05 | Nippon Densan Corp | Hydrodynamic bearing apparatus and electric motor using the same |
| CN203416142U (en) * | 2013-08-17 | 2014-01-29 | 赣州三进特种漆包线有限公司 | DC brushless motor using enameled aluminum wires as windings |
| CN205029448U (en) * | 2015-08-21 | 2016-02-10 | 芜湖环球汽车配件有限公司 | Novel direct -current motor |
| CN205402447U (en) * | 2016-03-14 | 2016-07-27 | 济南安居智能科技有限公司 | Dustproof LED ceiling lamp of easily maintaining |
| CN205647216U (en) * | 2016-05-05 | 2016-10-12 | 愈富制造（河源）有限公司 | Continuous current motor |
| WO2018032739A1 (en) * | 2016-08-15 | 2018-02-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Protective structure for magnetic bearing and magnetic bearing assembly |
| CN206775330U (en) * | 2016-11-01 | 2017-12-19 | 蔡甫寒 | DC motor commutator suppression electromagnetic interference structure |
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Application publication date: 20200811 |