CN216122159U - Brushless DC motor capable of weakening torque pulsation - Google Patents
Brushless DC motor capable of weakening torque pulsation Download PDFInfo
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- CN216122159U CN216122159U CN202122646504.9U CN202122646504U CN216122159U CN 216122159 U CN216122159 U CN 216122159U CN 202122646504 U CN202122646504 U CN 202122646504U CN 216122159 U CN216122159 U CN 216122159U
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- 230000010349 pulsation Effects 0.000 title abstract description 10
- 230000003313 weakening effect Effects 0.000 title abstract description 5
- 239000000945 filler Substances 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 10
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The utility model discloses a brushless direct current motor capable of weakening torque pulsation, which comprises a motor shell, wherein a stator component is fixedly arranged on the inner wall of the motor shell, the inner side of the stator component is provided with a rotor component, the inner side of the rotor component is fixedly provided with a rotating shaft, a baffle plate is fixedly arranged on the inner side of the motor shell, one end of the rotating shaft penetrates through the baffle plate and is fixedly provided with an auxiliary rotor component, the auxiliary rotor component and the rotor component are coaxially arranged, an auxiliary stator component is fixed on one side of the clapboard, a plurality of stator salient poles extend inwards from one side of the inner side of the stator component, which is uniformly close to the rotating shaft, first low-magnetic-conductance padding columns are fixedly embedded in two end faces of the stator salient poles, a plurality of rotor salient poles are uniformly fixed on the outer side of the rotor assembly, and second low-magnetic-conductance padding columns are fixedly embedded in two end faces of the rotor salient poles. The utility model can effectively reduce the torque pulsation and weaken the vibration and electromagnetic abnormal sound of the motor.
Description
Technical Field
The utility model relates to the technical field of brushless motors, in particular to a brushless direct current motor capable of weakening torque pulsation.
Background
The brushless DC motor is provided with a sensor for acquiring a position signal of a rotor in the running process of the brushless DC motor, the signal can be used for calculating due commutation information of the motor in a corresponding state, and the on-off of a power switch is controlled according to a commutation principle, so that a stepping rotating magnetic field is formed in an air gap to drive the permanent magnet rotor to rotate ceaselessly. The accuracy of the position information has a great influence on the commutation performance, and inaccurate position signals can increase torque pulsation, motor vibration and the like, so that motor commutation failure can be caused in severe cases. The rotation speed and the operation efficiency of the brushless direct current motor can be seriously influenced due to the existence of electromagnetic torque pulsation, and the application of the brushless direct current motor to the field with higher requirements on the performance of the motor is further influenced.
The electromagnetic torque ripple is mainly caused by two factors: 1. when the rotor is rotated to a phase-changing position, namely the center line of a magnetic pole of the rotor is overlapped with the center line of a magnetic pole generated by the exciting current of the stator, the electromagnetic force borne by the rotor is the largest (under the same condition of the exciting current of the stator), but the direction of the electromagnetic force is radial and is vertical to the running direction of the motor, namely the electromagnetic torque is zero at the moment, and the electromagnetic force can block the rotor; 2. the existing installation method of the Hall sensor can not ensure that the Hall sensor can accurately transmit the position information of the rotor to the control chip, small errors always occur, and the boundary line of the magnetic poles of the rotor is irregular, so that electromagnetic torque pulsation and electromagnetic resistance which hinders the operation of the rotor always occur at the phase change moment.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a brushless dc motor capable of attenuating torque ripple to solve the above-mentioned problems of the background art.
In order to solve the technical problems, the utility model provides the following technical scheme: the brushless direct current motor capable of weakening torque pulsation comprises a motor shell, wherein a stator assembly is fixedly mounted on the inner wall of the motor shell, a rotor assembly is arranged on the inner side of the stator assembly, a rotating shaft is fixedly mounted on the inner side of the rotor assembly, a partition plate is fixedly mounted on the inner side of the motor shell, an auxiliary rotor assembly is fixedly mounted at one end of the rotating shaft and penetrates through the partition plate, the auxiliary rotor assembly and the rotor assembly are coaxially arranged, an auxiliary stator assembly is fixed to one side of the partition plate, a plurality of stator salient poles uniformly extend inwards on the inner side of the stator assembly, first low-magnetic-conductance padding columns are fixedly embedded on two end faces of the stator salient poles, a plurality of rotor salient poles are uniformly fixed on the outer side of the rotor assembly, and second low-magnetic conductance padding columns are fixedly embedded on two end faces of the rotor salient poles.
Further, stator module includes stator core and twines in the enameled wire group in the stator core outside, stator core piles up for a plurality of silicon steel sheet and forms, has good magnetic permeability.
Further, the rotor subassembly includes a plurality of permanent magnet, the permanent magnet includes a plurality of magnetic shoe, just the magnetic shoe is the annular and arranges, constitutes the rotor subassembly through a plurality of permanent magnet, effectively reduces motor tooth's socket torque, the vibration and the electromagnetism abnormal sound of motor.
Furthermore, vice stator module includes vice stator core, the equidistant fixed mounting in the inner circle surface of vice stator core has a plurality of position sensor, position sensor is hall sensor, through the inner circle surface mounting position sensor at vice stator core, can avoid the influence that the inside magnetic field that produces of motor changes and the motor generates heat, is used for detecting the position of the relative static stator of synchronous rotor.
Furthermore, the auxiliary rotor assembly is an annular magnet which is fixedly arranged on the outer wall of the rotating shaft, and the annular magnet is magnetized in the radial direction to generate square wave counter electromotive force, so that the auxiliary rotor assembly and the stator assembly are coaxially connected and synchronously rotate, and the position signal measured by the position sensor is accurate.
Furthermore, first low magnetic conductance fills the post and the second low magnetic conductance fills the post and is made for the diamond material, fills the post through the first low magnetic conductance of diamond material and the post is filled to the second low magnetic conductance, because the magnetic permeability that the post was filled to first low magnetic conductance and the post is filled to the second low magnetic conductance is lower with the air phase ratio, reduction torque ripple that can be better.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the utility model, by arranging the auxiliary stator assembly and the auxiliary rotor assembly and installing the position sensor on the surface of the inner ring of the auxiliary stator iron core, the influence of magnetic field change generated inside the motor and the heating of the motor can be avoided, the position of the synchronous rotor relative to the static stator can be detected, the auxiliary rotor assembly and the stator assembly can be coaxially connected and synchronously rotated through the radial magnetization of the annular magnet to generate square wave back electromotive force, so that the position signal measured by the position sensor is ensured to be accurate, and the torque pulsation can be better reduced because the magnetic permeability of the first low-magnetic-permeability filler column and the second low-magnetic-permeability filler column is lower than that of air;
2. the stator assembly and the rotor assembly are arranged, the stator core is formed by stacking a plurality of silicon steel sheets, the magnetic conductivity is good, and the rotor assembly is formed by a plurality of permanent magnets, so that the cogging torque of the motor, the vibration of the motor and the electromagnetic noise are effectively reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a cross-sectional view of a stator assembly and a rotor assembly of the present invention;
FIG. 4 is a cross-sectional view of the secondary stator assembly and secondary rotor assembly of the present invention;
in the figure: 1. a motor housing; 2. a stator assembly; 21. a stator core; 22. an enameled wire group; 3. a rotor assembly; 4. a rotating shaft; 5. a partition plate; 6. a sub-rotor assembly; 7. a secondary stator assembly; 71. a sub stator core; 72. a position sensor; 8. stator salient poles; 9. a first low magnetic permeability filler column; 10. rotor salient poles; 11. and a second low-permeability filled column.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the utility model provides a brushless dc motor capable of attenuating torque ripple, comprising a motor housing 1, wherein a stator assembly 2 is fixedly mounted on an inner wall of the motor housing 1, a rotor assembly 3 is disposed on an inner side of the stator assembly 2, a rotating shaft 4 is fixedly mounted on an inner side of the rotor assembly 3, a partition plate 5 is fixedly mounted on an inner side of the motor housing 1, one end of the rotating shaft 4 penetrates through the partition plate 5 and is fixedly mounted with a sub-rotor assembly 6, the sub-rotor assembly 6 and the rotor assembly 3 are coaxially arranged, a sub-stator assembly 7 is fixed on one side of the partition plate 5, a plurality of stator salient poles 8 extend inwards from one side of the inner side of the stator assembly 2, which is uniformly close to the rotating shaft 4, first low-magnetic conductive padding columns 9 are fixedly embedded on two end faces of the stator salient poles 8, a plurality of rotor salient poles 10 are uniformly fixed on an outer side of the rotor assembly 3, and second low-magnetic conductive filling columns 11 are fixedly embedded on two end faces of the rotor salient pole 10.
In a preferred embodiment, the stator assembly 2 includes a stator core 21 and an enameled wire group 22 wound outside the stator core 21, and the stator core 21 is formed by stacking a plurality of silicon steel sheets, so as to secure the inside of the motor.
In a preferred embodiment, the rotor assembly 3 includes a plurality of permanent magnets, the permanent magnets include a plurality of magnetic shoes, and the magnetic shoes are arranged annularly, constitute the rotor assembly 3 through a plurality of permanent magnets, effectively reduce motor cogging torque, the vibration of motor and the electromagnetism abnormal sound.
In a preferred embodiment, the sub-stator assembly 7 includes a sub-stator core 71, a plurality of position sensors 72 are fixedly mounted on an inner ring surface of the sub-stator core 71 at equal intervals, the position sensors 72 are hall sensors, and the position sensors 72 are mounted on the inner ring surface of the sub-stator core 71, so that the influence of a magnetic field change generated inside the motor and the heat generated by the motor can be avoided, and the position of the synchronous rotor relative to the stationary stator can be detected.
In a preferred embodiment, the sub-rotor assembly 6 is a ring magnet fixedly mounted on the outer wall of the rotating shaft 4, and the ring magnet is magnetized in the radial direction to generate square wave back electromotive force, so that the sub-rotor assembly 6 and the stator assembly 2 can be coaxially connected and synchronously rotate, and therefore, the position signal measured by the position sensor 72 is accurate.
In a preferred embodiment, the first low-magnetic-permeability filler pillar 9 and the second low-magnetic-permeability filler pillar 11 are both made of diamond, and the first low-magnetic-permeability filler pillar 9 and the second low-magnetic-permeability filler pillar 11 made of diamond are used to reduce torque ripple better because the magnetic permeability of the first low-magnetic-permeability filler pillar 9 and the second low-magnetic-permeability filler pillar 11 is lower than that of air.
The working principle of the utility model is as follows: by arranging the auxiliary stator assembly 7 and the auxiliary rotor assembly 6 and installing the position sensor 72 on the surface of the inner ring of the auxiliary stator iron core 71, the influence of magnetic field change generated inside the motor and the heating of the motor can be avoided, the position of the synchronous rotor relative to a static stator is detected, square wave counter electromotive force is generated by radial magnetization of the annular magnet, the auxiliary rotor assembly 6 and the stator assembly 2 are coaxially connected and synchronously rotate, and therefore the position signal measured by the position sensor 72 is accurate; through setting up stator module 2 and rotor subassembly 3, stator core 21 piles up for a plurality of silicon steel sheet and forms, has good magnetic conductivity, constitutes rotor subassembly 3 through a plurality of permanent magnet, effectively reduces the vibration and the electromagnetism abnormal sound of motor tooth's socket torque, motor.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. Brushless DC motor that can weaken torque ripple, including motor housing (1), its characterized in that: the inner wall of the motor shell (1) is fixedly provided with a stator component (2), the inner side of the stator component (2) is provided with a rotor component (3), the inner side of the rotor component (3) is fixedly provided with a rotating shaft (4), the inner side of the motor shell (1) is fixedly provided with a partition plate (5), one end of the rotating shaft (4) penetrates through the partition plate (5) and is fixedly provided with an auxiliary rotor component (6), the auxiliary rotor component (6) and the rotor component (3) are coaxially arranged, one side of the partition plate (5) is fixedly provided with an auxiliary stator component (7), one side of the inner side of the stator component (2), which is uniformly close to the rotating shaft (4), inwards extends to form a plurality of stator salient poles (8), two end faces of each stator salient pole (8) are fixedly embedded with a first low-magnetic-permeability filler column (9), and the outer side of the rotor component (3) is uniformly fixed with a plurality of rotor salient poles (10), and second low-magnetic-conductance filling columns (11) are fixedly embedded in the two end faces of the rotor salient poles (10).
2. The brushless dc motor with torque ripple attenuation of claim 1, wherein: stator module (2) include stator core (21) and twine in enamelled wire group (22) in stator core (21) outside, stator core (21) are that a plurality of silicon steel sheet piles up and forms.
3. The brushless dc motor with torque ripple attenuation of claim 1, wherein: the rotor assembly (3) comprises a plurality of permanent magnets, the permanent magnets comprise a plurality of magnetic shoes, and the magnetic shoes are arranged in an annular mode.
4. The brushless dc motor with torque ripple attenuation of claim 1, wherein: the auxiliary stator assembly (7) comprises an auxiliary stator core (71), a plurality of position sensors (72) are fixedly mounted on the surface of an inner ring of the auxiliary stator core (71) at equal intervals, and the position sensors (72) are Hall sensors.
5. The brushless dc motor with torque ripple attenuation of claim 1, wherein: the auxiliary rotor assembly (6) is an annular magnet which is fixedly arranged on the outer wall of the rotating shaft (4).
6. The brushless dc motor with torque ripple attenuation of claim 1, wherein: the first low-magnetic-conductance filling column (9) and the second low-magnetic-conductance filling column (11) are made of diamond materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122646504.9U CN216122159U (en) | 2021-11-01 | 2021-11-01 | Brushless DC motor capable of weakening torque pulsation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122646504.9U CN216122159U (en) | 2021-11-01 | 2021-11-01 | Brushless DC motor capable of weakening torque pulsation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216122159U true CN216122159U (en) | 2022-03-22 |
Family
ID=80711704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122646504.9U Expired - Fee Related CN216122159U (en) | 2021-11-01 | 2021-11-01 | Brushless DC motor capable of weakening torque pulsation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216122159U (en) |
-
2021
- 2021-11-01 CN CN202122646504.9U patent/CN216122159U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220322 |
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| CF01 | Termination of patent right due to non-payment of annual fee |