CN113036983A - Brushless DC motor - Google Patents
Brushless DC motor Download PDFInfo
- Publication number
- CN113036983A CN113036983A CN202110282763.XA CN202110282763A CN113036983A CN 113036983 A CN113036983 A CN 113036983A CN 202110282763 A CN202110282763 A CN 202110282763A CN 113036983 A CN113036983 A CN 113036983A
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- Prior art keywords
- piston
- brushless
- rotor
- ring
- piston head
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- 239000006096 absorbing agent Substances 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims description 21
- 230000006835 compression Effects 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 19
- 238000005192 partition Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000010349 pulsation Effects 0.000 abstract description 4
- 230000005389 magnetism Effects 0.000 abstract 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention provides a brushless direct current motor which comprises a shell, a stator assembly, a rotor assembly and torsional vibration absorbers, wherein the rotor assembly comprises a rotor body and a rotor shaft, the rotor body is coaxially arranged on the rotor shaft, the stator assembly is fixedly connected in the shell and is matched with the rotor body, and the torsional vibration absorbers are arranged at two ends of the rotor body and are connected with the rotor shaft. This application connects rotor body and rotor shaft through setting up torsional damper, and when brushless DC motor started, the permanent magnetism body can rotate at first under the effect of magnetic force, drives the rotation of rotation axis through torsional damper then, external output torque. The torsional damper can effectively attenuate torque pulsation generated when the motor is started or the rotating speed is suddenly changed, and has good practicability.
Description
Technical Field
The invention relates to the field of motors, in particular to a brushless direct current motor.
Background
At present, most of rotor assemblies of the existing inner rotor type brushless direct current motors are formed by assembling a permanent magnet and a rotating shaft in an interference mode, the whole rotor assemblies are directly connected with the whole motor and an output shaft in a rigid mode, when the brushless direct current motors are started or the rotating speed is suddenly changed, the rotor assemblies of the existing inner rotor type brushless direct current motors can generate torque pulsation, and under the excitation, the brushless direct current motors can vibrate integrally. Irregular overall vibration can cause the movement interference of parts in the motor, thereby not only influencing the working efficiency of the motor, but also improving the failure rate of the motor and shortening the service life of the motor.
Disclosure of Invention
Based on this, in order to solve the problems that the brushless motor is rigidly connected, resonance between parts is easily generated, resonance stress is generated, torsional vibration and noise are large when a power system works under torque load, and stability of output is seriously influenced, the invention provides a brushless direct current motor, and the specific technical scheme is as follows:
a brushless direct current motor comprises a shell, a stator assembly, a rotor assembly and torsional vibration absorbers, wherein the rotor assembly comprises a rotor body and a rotor shaft, the rotor body is coaxially arranged on the rotor shaft, the stator assembly is fixedly connected in the shell and is matched with the rotor body, and the torsional vibration absorbers are arranged at two ends of the rotor body and are connected with the rotor shaft.
Foretell brushless DC motor connects rotor body and rotor shaft through setting up torsional damper, and when brushless DC motor started, the permanent-magnet body can rotate at first under the effect of magnetic force, drives the rotation of rotation axis through torsional damper then, external output torque. The torsional damper can effectively attenuate torque pulsation generated when the motor is started or the rotating speed is suddenly changed, and has good practicability.
Furthermore, the torsional vibration damper comprises a plurality of damping pull rods, an outer ring and an inner ring, the inner ring is sleeved at the end part of the rotor shaft, the outer ring and the inner ring are arranged at the end part of the rotor body in a matching manner, and the damping pull rods are connected between the inner ring and the outer ring.
Furthermore, the damping pull rod comprises a cylinder, a pull rod assembly, a push rod assembly, a first compression spring and a second compression spring, the cylinder is hollow, a partition plate is arranged in the middle of an inner cavity of the cylinder, the partition plate divides the inner cavity of the cylinder into a first stroke cavity and a second stroke cavity, the pull rod assembly is in sliding connection with the first stroke cavity, one part of the pull rod assembly extends out of the first stroke cavity, the push rod assembly is in sliding connection with the second stroke cavity, one part of the push rod assembly extends out of the second stroke cavity, the first compression spring is arranged in the first stroke cavity, and the second compression spring is arranged in the second stroke cavity.
Further, the cylinder barrel is a cylinder.
Furthermore, the damping pull rod further comprises a first end cover and a second end cover, and the first end cover and the second end cover are respectively connected to two ends of the cylinder barrel.
Further, the pull rod assembly comprises a first bushing, a first piston rod, a first piston head and a first piston ring, the first bushing and the first piston head are respectively connected to two ends of the first piston rod, the first piston ring is sleeved on the periphery of the first piston head, the first piston head is slidably connected in the first stroke cavity through the first piston ring, and the first compression spring is sleeved on the periphery of the first piston rod; the push rod assembly comprises a second bushing, a second piston rod, a second piston head and a second piston ring, the second bushing and the second piston head are respectively connected to two ends of the second piston rod, the second piston ring is sleeved on the periphery of the second piston head, the second piston head is connected to the second stroke cavity in a sliding mode through the second piston ring, and the second compression spring is sleeved on the periphery of the second piston rod.
Further, the first bushing is rotatably connected with the inner wall of the outer ring, and the second bushing is rotatably connected with the outer wall of the inner ring.
Further, the length of the first piston rod is longer than the length of the second piston rod.
Further, the first stroke cavity and the second stroke cavity are filled with damping media.
Furthermore, a plurality of damping holes are formed in the first piston head and the second piston head.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a schematic structural diagram of a brushless dc motor according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a torsional vibration damper of a brushless DC motor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a damping rod of a brushless dc motor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first energy consuming component and a second energy consuming component of a brushless dc motor according to an embodiment of the present invention;
fig. 5 is a second schematic structural diagram of a first energy consuming component and a second energy consuming component of a brushless dc motor according to a second embodiment of the present invention.
Description of reference numerals:
11. a front housing; 12. a middle shell; 13. a rear housing; 2. a stator assembly; 31. a rotor shaft; 32. a rotor body; 33. a bearing; 4. a torsional vibration damper; 41. a damping pull rod; 411. a first piston rod; 412. a first piston head; 413. a first piston ring; 414. a first end cap; 415. a first compression spring; 416. a cylinder barrel; 417. a second bushing; 42. an outer ring; 43. an inner ring; 51. a hub; 52. a circular arc.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terms "first" and "second" used herein do not denote any particular order or quantity, but rather are used to distinguish one element from another.
As shown in fig. 1 to 5, a brushless dc motor in an embodiment of the present invention includes a housing, a stator assembly 2, a rotor assembly, and a torsional vibration damper 4, where the rotor assembly includes a rotor body 32 and a rotor shaft 31, the rotor body 32 is coaxially disposed with the rotor shaft 31, the stator assembly 2 is fixedly connected in the housing and is disposed in a manner of being matched with the rotor body 32, and the torsional vibration damper 4 is disposed at two ends of the rotor body 32 and is connected with the rotor shaft 31.
Foretell brushless DC motor connects rotor body 32 and rotor shaft 31 through setting up torsional damper 4, and when brushless DC motor started, rotor body 32 can rotate at first under the effect of magnetic force, then drives the rotation of rotation axis through torsional damper 4, external output torque. The torsional damper 4 can effectively attenuate torque pulsation generated when the motor is started or the rotating speed is suddenly changed, and has good practicability.
Specifically, the casing is including preceding shell 11, mesochite 12 and the backshell 13 that connects gradually, it has the through-hole to open on the preceding shell 11, preceding shell 11 with all be provided with bearing 33 on the backshell 13, rotor shaft 31 with bearing 33 connects, 2 fixed connection of stator module in the mesochite 12, rotor shaft 31's output passes the through-hole.
In one embodiment, the torsional vibration damper 4 includes a plurality of damping rods 41, an outer ring 42 and an inner ring 43, the inner ring 43 is sleeved on the end of the rotor shaft 31, the outer ring 42 and the inner ring 43 are fittingly arranged on the end of the rotor body 32, and the damping rods 41 are connected between the inner ring 43 and the outer ring 42.
In one embodiment, the damping pull rod 41 includes a cylinder 416, a pull rod assembly, a push rod assembly, a first compression spring 415 and a second compression spring, the cylinder 416 is hollow, a partition is disposed in the middle of an inner cavity of the cylinder 416, the inner cavity of the cylinder 416 is partitioned by the partition to form a first stroke cavity and a second stroke cavity, the pull rod assembly is slidably connected to the first stroke cavity, a portion of the pull rod assembly extends out of the first stroke cavity, the push rod assembly is slidably connected to the second stroke cavity, a portion of the push rod assembly extends out of the second stroke cavity, the first compression spring 415 is disposed in the first stroke cavity, and the second compression spring is disposed in the second stroke cavity.
In one embodiment, the cylinder 416 is a cylinder.
In one embodiment, the damping rod 41 further includes a first end cap 414 and a second end cap, and the first end cap 414 and the second end cap are respectively connected to two ends of the cylinder 416.
In one embodiment, the first stroke chamber and the second stroke chamber are filled with damping medium. Through the design of the end cover, one stroke limitation can be carried out on the pull rod assembly and the push rod assembly, meanwhile, the damping medium can move back and forth in the stroke cavity, and through the design, the vibration of the motor can be effectively reduced.
In one embodiment, the pull rod assembly includes a first bushing, a first piston rod 411, a first piston head 412 and a first piston ring 413, the first bushing and the first piston head 412 are respectively connected to two ends of the first piston rod 411, the first piston ring 413 is sleeved on the outer circumference of the first piston head 412, the first piston head 412 is slidably connected in the first stroke cavity through the first piston ring 413, and the first compression spring 415 is sleeved on the outer circumference of the first piston rod 411; the push rod assembly comprises a second bushing 417, a second piston rod, a second piston head and a second piston ring, the second bushing 417 and the second piston head are respectively connected to two ends of the second piston rod, the second piston ring is sleeved on the periphery of the second piston head, the second piston head is slidably connected in the second stroke cavity through the second piston ring, and the second compression spring is sleeved on the periphery of the second piston rod.
In one embodiment, the first bushing is rotatably coupled to the inner wall of the outer ring 42 and the second bushing 417 is rotatably coupled to the outer wall of the inner ring 43.
In one embodiment, the length of the first piston rod 411 is longer than the length of the second piston rod.
In one embodiment, the first piston head 412 and the second piston head each have a plurality of damping holes formed therein.
In one embodiment, a first energy dissipation assembly and a second energy dissipation assembly are respectively connected to two ends of the rotor shaft 31, each of the first energy dissipation assembly and the second energy dissipation assembly includes a hub 51 and three circular arcs 52 equally distributed around the outer surface of the hub 51, and the three circular arcs 52 on the first energy dissipation assembly and the second energy dissipation assembly are staggered to form a circle. With this design, the center of gravity of both ends of the rotor shaft 31 can be adjusted by the respective arcs 52 during rotation, thereby avoiding a large amount of play.
In one embodiment, two ends of the arc 52 are bent and increased towards the rotor shaft 31, and the arc 52 is made of rubber, so that the arc 52 can be deformed due to self weight during rotation to achieve the effect of vibration reduction, and hysteresis can be generated through deformation to keep the center of gravity and the center of the rotor shaft 31 within an error allowable range.
Specifically, the circular arc 52 does not contact the inner wall of the housing.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A brushless direct current motor is characterized by comprising a shell, a stator assembly, a rotor assembly and torsional vibration absorbers, wherein the rotor assembly comprises a rotor body and a rotor shaft, the rotor body is coaxially arranged on the rotor shaft, the stator assembly is fixedly connected in the shell and is matched with the rotor body, and the torsional vibration absorbers are arranged at two ends of the rotor body and are connected with the rotor shaft.
2. A brushless dc motor according to claim 1, wherein the torsional vibration damper includes a plurality of damping rods, an outer ring, and an inner ring, the inner ring is fitted to an end of the rotor shaft, the outer ring is fitted to the inner ring at an end of the rotor body, and the damping rods are connected between the inner ring and the outer ring.
3. The brushless direct current motor according to claim 2, wherein the damping pull rod includes a cylinder, a pull rod assembly, a push rod assembly, a first compression spring, and a second compression spring, the cylinder is hollow, a partition is disposed in the middle of an inner cavity of the cylinder, the inner cavity of the cylinder is partitioned by the partition to form a first stroke cavity and a second stroke cavity, the pull rod assembly is slidably connected to the first stroke cavity, a portion of the pull rod assembly extends out of the first stroke cavity, the push rod assembly is slidably connected to the second stroke cavity, a portion of the push rod assembly extends out of the second stroke cavity, the first compression spring is disposed in the first stroke cavity, and the second compression spring is disposed in the second stroke cavity.
4. A brushless dc motor according to claim 3, wherein the cylinder is a cylinder.
5. A brushless DC motor according to claim 4, wherein the damping rod further comprises a first end cap and a second end cap, the first end cap and the second end cap being connected to two ends of the cylinder respectively.
6. The brushless dc motor as claimed in claim 3, wherein the pull rod assembly comprises a first bushing, a first piston rod, a first piston head, and a first piston ring, the first bushing and the first piston head are respectively connected to two ends of the first piston rod, the first piston ring is sleeved on an outer circumference of the first piston head, the first piston head is slidably connected to the first stroke cavity through the first piston ring, and the first compression spring is sleeved on an outer circumference of the first piston rod; the push rod assembly comprises a second bushing, a second piston rod, a second piston head and a second piston ring, the second bushing and the second piston head are respectively connected to two ends of the second piston rod, the second piston ring is sleeved on the periphery of the second piston head, the second piston head is connected to the second stroke cavity in a sliding mode through the second piston ring, and the second compression spring is sleeved on the periphery of the second piston rod.
7. A brushless DC motor according to claim 6, wherein the first bushing is rotatably connected to the inner wall of the outer ring and the second bushing is rotatably connected to the outer wall of the inner ring.
8. A brushless DC motor according to claim 6, wherein the length of the first piston rod is longer than the length of the second piston rod.
9. A brushless DC motor according to claim 5, wherein the first stroke chamber and the second stroke chamber are each filled with damping medium.
10. A brushless DC motor according to claim 6, wherein the first piston head and the second piston head each have damping holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110282763.XA CN113036983B (en) | 2021-03-16 | Brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110282763.XA CN113036983B (en) | 2021-03-16 | Brushless DC motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113036983A true CN113036983A (en) | 2021-06-25 |
| CN113036983B CN113036983B (en) | 2024-07-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595316A (en) * | 2021-08-02 | 2021-11-02 | 绍兴上风电机科技股份有限公司 | Heat dissipation and shock prevention device for motor |
| CN115833467A (en) * | 2023-02-14 | 2023-03-21 | 三谷科技(东莞)有限公司 | Direct-current brushless motor with output vibration reduction function |
| DE102021214732A1 (en) | 2021-12-20 | 2023-06-22 | Rolls-Royce Deutschland Ltd & Co Kg | Electrical machine with a multi-part coupling device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5185543A (en) * | 1990-02-27 | 1993-02-09 | Fichtel & Sachs Ag | Motor vehicle drive line torsional vibration damper |
| US20080296985A1 (en) * | 2007-05-31 | 2008-12-04 | Asmo Co., Ltd. | Brushless motor |
| CN207234594U (en) * | 2017-10-12 | 2018-04-13 | 南京越博电驱动系统有限公司 | A kind of motor of built-in torsion vibration absorber |
| CN207426888U (en) * | 2017-11-29 | 2018-05-29 | 南京越博电驱动系统有限公司 | A kind of permanent magnet synchronous motor of built-in torsional vibration damper |
| CN207968268U (en) * | 2018-02-09 | 2018-10-12 | 南京越博电驱动系统有限公司 | A kind of permanent magnet synchronous motor being integrated with torsional vibration damper |
| CN211089249U (en) * | 2019-09-26 | 2020-07-24 | 常州神力小微电机有限公司 | High-strength anti-torsion motor iron core |
| CN112013036A (en) * | 2020-09-07 | 2020-12-01 | 唐荣富 | Automobile torsional vibration damping device |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5185543A (en) * | 1990-02-27 | 1993-02-09 | Fichtel & Sachs Ag | Motor vehicle drive line torsional vibration damper |
| US20080296985A1 (en) * | 2007-05-31 | 2008-12-04 | Asmo Co., Ltd. | Brushless motor |
| CN207234594U (en) * | 2017-10-12 | 2018-04-13 | 南京越博电驱动系统有限公司 | A kind of motor of built-in torsion vibration absorber |
| CN207426888U (en) * | 2017-11-29 | 2018-05-29 | 南京越博电驱动系统有限公司 | A kind of permanent magnet synchronous motor of built-in torsional vibration damper |
| CN207968268U (en) * | 2018-02-09 | 2018-10-12 | 南京越博电驱动系统有限公司 | A kind of permanent magnet synchronous motor being integrated with torsional vibration damper |
| CN211089249U (en) * | 2019-09-26 | 2020-07-24 | 常州神力小微电机有限公司 | High-strength anti-torsion motor iron core |
| CN112013036A (en) * | 2020-09-07 | 2020-12-01 | 唐荣富 | Automobile torsional vibration damping device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595316A (en) * | 2021-08-02 | 2021-11-02 | 绍兴上风电机科技股份有限公司 | Heat dissipation and shock prevention device for motor |
| CN113595316B (en) * | 2021-08-02 | 2022-07-08 | 绍兴上风电机科技股份有限公司 | Motor heat dissipation shock mounting |
| DE102021214732A1 (en) | 2021-12-20 | 2023-06-22 | Rolls-Royce Deutschland Ltd & Co Kg | Electrical machine with a multi-part coupling device |
| CN115833467A (en) * | 2023-02-14 | 2023-03-21 | 三谷科技(东莞)有限公司 | Direct-current brushless motor with output vibration reduction function |
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