CN216146227U - External rotor sound wave brushless motor - Google Patents
External rotor sound wave brushless motor Download PDFInfo
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- CN216146227U CN216146227U CN202121236120.3U CN202121236120U CN216146227U CN 216146227 U CN216146227 U CN 216146227U CN 202121236120 U CN202121236120 U CN 202121236120U CN 216146227 U CN216146227 U CN 216146227U
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Abstract
The utility model relates to an outer rotor sound wave brushless motor, which comprises a rotor assembly, a stator assembly and an end cover assembly, wherein the rotor assembly is arranged on the stator assembly; the rotor assembly comprises a shaft branch, a magnetic steel protective sleeve penetrating through the shaft branch, magnetic steel distributed on the magnetic steel protective sleeve and a rotor shell coated outside the magnetic steel protective sleeve; the stator assembly comprises a stator core arranged on the end cover assembly and a coil winding wound on stator teeth of the stator core; the end cover assembly comprises a machine shell and a rear cover which are installed in a matched mode, ball bearings for bearing the shaft branches are respectively arranged on the machine shell and the rear cover, and the ball bearings at one end of the rear cover are clamped on the shaft branches by clamping springs. The outer rotor sound wave brushless motor realizes stable high-frequency vibration output and improves the energy efficiency ratio on the premise of not depending on the rigidity and toughness of materials by reasonably designing the assembly relationship of the rotor assembly and the stator assembly; in addition, the simple structural design has lower failure rate and ideal service life.
Description
Technical Field
The utility model relates to the technical field of brushless motors, in particular to an outer rotor sound wave brushless motor.
Background
Compare traditional toothbrush, electric toothbrush's clean effect is stronger, and the use is more convenient, along with manufacturing cost's reduction and processing technology's improvement, electric toothbrush has stepped into more and more people's life now, replaces traditional toothbrush to become novel articles for daily use. At present, most of electric toothbrushes on the market adopt a sound wave motor provided with a torsion bar of a spring or a similar torsion spring or an inner rotor brushless motor, the structure of the sound wave motor is complex, the operation reliability depends on the rigidity and toughness of materials, the physical properties of the materials are unstable, and the overall service life of the electric toothbrush is influenced to a great extent; whereas the latter is insufficient in energy efficiency ratio.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides an outer rotor sound wave brushless motor.
The technical scheme adopted by the utility model is as follows:
an outer rotor acoustic brushless motor, comprising:
the rotor assembly, the stator assembly and the end cover assembly;
the rotor assembly comprises a shaft branch 11, a magnetic steel protective sleeve 12 penetrating through the shaft branch 11, magnetic steel 13 arranged on the magnetic steel protective sleeve 12 and a rotor shell 14 coated outside the magnetic steel protective sleeve 12;
the stator assembly comprises a stator core 21 mounted on the end cover assembly, and a coil winding 22 wound on the stator teeth of the stator core 21;
the end cover assembly comprises a machine shell 31 and a rear cover 32 which are installed in a matched mode, ball bearings 33 for bearing the shaft branches 11 are respectively arranged on the machine shell 31 and the rear cover 32, and the ball bearings 33 at one end of the rear cover 32 are clamped on the shaft branches 11 through clamp springs 34.
Preferably, the radial section of the magnetic steel protective sleeve 12 is in an axisymmetric shape, two mounting hole sites are respectively arranged on two sides of the symmetry axis, and the magnetic steel 13 is respectively and firmly mounted on the four mounting hole sites on the magnetic steel protective sleeve 12;
the rotor shell 14 is coated outside the magnetic steel protective sleeve 12, and limits and reinforces the magnetic steel 13 mounted on the magnetic steel protective sleeve 12.
Preferably, the radial cross section of the stator core 21 is in an axisymmetric shape, two sides of the symmetry axis are respectively provided with two stator teeth, and enameled wires are respectively wound on the two stator teeth along the axial direction to obtain the coil winding 22;
wherein the number of turns of the two coil windings 22 is the same.
Preferably, the rotor assembly is mounted on the shaft branch 11 and penetrates through a central hole of the stator core 21 along with the shaft branch 11, so that the rotor assembly and the stator assembly are assembled in an axial direction concentrically, and an air gap exists between the rotor assembly and the stator assembly;
the mounting position of the magnetic steel 13 distributed on the magnetic steel protective sleeve 12 is matched with the shape of the radial section of the stator teeth on two sides of the stator core 21;
Preferably, in the suspension state, along the radial section, the extended line of the connecting line of the axis and the outer edges of the two ends of the stator teeth divides the section of the magnetic steel;
the intersection point of the extension line on the inner side of the section of the magnetic steel is taken as a boundary, one side of the section of the magnetic steel on the same side with the stator iron core 21 is a self-suction surface of the magnetic steel 13, and the area of the section of the magnetic steel excluding the self-suction surface is a non-self-suction surface; wherein the area of the self-suction surface is constantly larger than that of the non-self-suction surface;
aiming at the outer edge of any one magnetic steel section and the outer edges of two adjacent magnetic steel sections, a rotor large spacing angle C1 and a rotor small spacing angle C2 are obtained by connecting based on the axis;
the included angle between the axis and the connecting line of the outer edges of any stator tooth is a stator tooth angle E1;
and the included angle between the axis and the connecting line of the two ends of the outer edge of the section of the magnetic steel is a magnetic steel angle C3 of the magnetic steel 13.
Preferably, the performance of the outer rotor acoustic wave brushless motor is influenced by the size parameters and the arrangement mode of the magnetic steel 13;
under the condition that the magnetic steel angle C3 is not changed, if the rotor large-distance angle C1 is increased and/or the rotor small-distance angle C2 is decreased, the motor performance of the outer rotor sound wave brushless motor is improved;
under the condition that the rotor small-distance angle C2 is not changed, if the rotor large-distance angle C1 is reduced and/or the magnet steel angle C3 is increased, the motor performance of the outer rotor sound wave brushless motor is improved;
in addition, when the rotor large pitch angle C1, the rotor small pitch angle C2 and the magnet steel angle C3 are not changed, if the stator tooth angle E1 is increased, the motor performance of the outer rotor acoustic wave brushless motor is improved;
furthermore, when the rotor large pitch angle C1, the rotor small pitch angle C2, and the stator tooth angle E1 are not changed, the cost is reduced by appropriately decreasing the angle of the magnet angle C3;
in addition, the inner side angle of the stator teeth is adjusted, the size of an inner hole of the stator core 21 is reduced, the slot filling rate and the number of winding turns are improved, and therefore the motor performance of the outer rotor acoustic wave brushless motor is improved.
Preferably, the two coil windings 22 are driven by a driving current in a magnetic field formed by the magnetic steel 13 to generate a magnetic force, and the current direction of the driving current is changed according to a preset frequency;
the magnetic force generates an acting force on the magnetic steel 13 to push the magnetic steel 13, and then the magnetic steel 13 drives the rotor assembly to swing in one direction in the machine shell 31;
when the current direction of the driving current is changed, the two coil windings 22 generate magnetic force different from the magnetic force generated at the previous moment;
the magnetic force with different magnetism generates acting force on the magnetic steel 13 to pull the magnetic steel 13, so that the magnetic steel 13 drives the rotor assembly to swing in the shell 31 in the direction opposite to the previous moment;
along with the change of the current direction, the rotor assembly performs reciprocating circular oscillation in the machine shell 31 along the axis;
the change frequency of the current direction is positively correlated with the swing frequency of the rotor assembly.
Preferably, in the radial cross section, the polarities of a group of magnetic steels 13 corresponding to the same stator tooth are different;
two adjacent magnetic steels 13 which are positioned in different groups have the same polarity.
Compared with the prior art, the utility model has the following advantages:
the outer rotor acoustic wave brushless motor realizes stable high-frequency vibration output and improves the energy efficiency ratio on the premise of not depending on the rigidity and toughness of materials by reasonably designing the assembly relationship between the rotor assembly and the stator assembly and not adopting a complex mechanical structure; in addition, the simple structural design has lower failure rate and ideal service life.
Drawings
Fig. 1 is an exploded view of an external rotor acoustic wave brushless motor according to the present invention;
fig. 2 is an assembly view of an outer rotor acoustic wave brushless motor according to the present invention in a radial section;
fig. 3 is a schematic polarity diagram of a rotor assembly and a stator assembly when the external rotor acoustic brushless motor according to the present invention is powered on.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiment examples.
The present invention is described in terms of particular embodiments, other advantages and features of the utility model will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the utility model and that it is not intended to limit the utility model to the particular embodiments disclosed. 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.
The external rotor acoustic wave brushless motor of the utility model can comprise the following embodiments:
referring to fig. 1, 2 and 3, fig. 1 is an exploded schematic view of an outer rotor acoustic wave brushless motor according to the present invention; fig. 2 is an assembly view of an outer rotor acoustic wave brushless motor according to the present invention in a radial section; fig. 3 is a schematic polarity diagram of a rotor assembly and a stator assembly when the external rotor acoustic brushless motor according to the present invention is powered on.
The utility model provides an outer rotor acoustic wave brushless motor, which comprises:
rotor subassembly, stator module and end cover subassembly.
In this embodiment, the rotor assembly includes a shaft branch 11, a magnetic steel protective sleeve 12 penetrating the shaft branch 11, a magnetic steel 13 disposed on the magnetic steel protective sleeve 12, and a rotor shell 14 covering the magnetic steel protective sleeve 12.
The radial section of the magnetic steel protective sleeve 12 is in an axisymmetric shape, two mounting hole sites are respectively arranged on two sides of the symmetry axis, and the magnetic steel 13 is respectively and firmly mounted on four mounting hole sites on the magnetic steel protective sleeve 12; the rotor shell 14 is coated outside the magnetic steel protective sleeve 12, and limits and reinforces the magnetic steel 13 arranged on the magnetic steel protective sleeve 12.
In addition, need reduce motor weight or save under the condition of cost, can take demagnetization steel protective sheath 12, punching process out adaptation in magnet steel 13 mounted position bump in rotor shell 14 is inside, carries on spacingly and consolidates magnet steel 13 through the bump, further simplifies the structure, reduction in production cost.
In this embodiment, the stator assembly includes a stator core 21 mounted to the end cap assembly, and a coil winding 22 wound around stator teeth of the stator core 21;
the radial section of the stator core 21 is in an axisymmetrical shape, two sides of the symmetry axis are respectively provided with two stator teeth, enameled wires are respectively wound on the two stator teeth along the axial direction to obtain the coil windings 22, and the number of turns of the two coil windings 22 is consistent so as to ensure that the magnetic forces generated by the two coil windings 22 are consistent when the stator core is electrified.
The rotor subassembly is installed on axle branch 11 to run through stator core 21's centre bore along with axle branch 11, thereby rotor subassembly and stator module are at the concentric assembly of axial, and have the air gap between rotor subassembly and the stator module, and the air gap can supply the part that the operation generates heat to carry out the heat exchange with the air, realizes the heat dissipation.
The mounting position of the magnetic steel 13 arranged on the magnetic steel protective sleeve 12 is matched with the shape of the radial section of the stator teeth at two sides of the stator core 21, namely the projection of the stator teeth at the inner side of the magnetic steel 13 occupies most area of the inner side of the magnetic steel 13;
two magnet steels 13 of magnet steel protective sheath 12 arbitrary side are a set of, adsorb the stator tooth of stator core 21 one side, and the stator tooth of stator core 21 both sides is adsorbed respectively to two sets of magnet steels 13 of magnet steel protective sheath 12 both sides promptly to magnet steel 13 and magnet steel protective sheath 12 are in the suspended state at radial relative stator module, and the rotor subassembly suspends in the stator module outside promptly. Specifically, the stator teeth are attracted by magnetic force, and because the shape of the stator teeth is matched with the installation position of the magnetic steel 13, when the rotor assembly is nested with the stator assembly, the four pieces of magnetic steel 13 attract the stator teeth from different angles of the circumference, so that the rotor assembly is in a suspension state outside the stator assembly. Because rotor subassembly and stator module do not directly produce the contact, effectively avoided causing the efficiency ratio to descend, generate heat scheduling problem because of the friction.
In addition, in a suspension state, along a radial section, the extended line of the connecting line of the axis and the outer edges of the two ends of the stator teeth divides the section of the magnetic steel;
here, the intersection point of the extension line at the inner side of the section of the magnetic steel is taken as a boundary, one side of the section of the magnetic steel, which is on the same side as the stator core 21, is a self-suction surface of the magnetic steel 13, and the area of the section of the magnetic steel excluding the self-suction surface is a non-self-suction surface; the area of the self-suction surface is constantly larger than that of the non-self-suction surface, so that the magnetic steel 13 is ensured to have enough magnetic force to adsorb the stator teeth, and the rotor assembly is maintained to be suspended outside the stator assembly.
And aiming at the outer edge of any magnetic steel section and the outer edges of two adjacent magnetic steel sections, a rotor large spacing angle C1 and a rotor small spacing angle C2 can be obtained by connecting the outer edges of the magnetic steel sections and the outer edges of the two adjacent magnetic steel sections based on the axis; the included angle between the axis and the connecting line of the outer edge of any stator tooth is a stator tooth angle E1; the included angle between the axis and the connecting line of the two ends of the outer edge of the section of the magnetic steel is a magnetic steel angle C3 of the magnetic steel 13.
The size parameters and the layout mode of the magnetic steel 13 affect the motor performances such as the torque, the swing amplitude and the like of the external rotor acoustic wave brushless motor, and the specific influence modes are as follows:
a. under the condition that the magnetic steel angle C3 is not changed, if the rotor large-distance angle C1 is increased and/or the rotor small-distance angle C2 is decreased, the motor performance of the outer rotor sound wave brushless motor is improved;
b. under the condition that the small rotor spacing angle C2 is not changed, if the large rotor spacing angle C1 is reduced and/or the magnetic steel angle C3 is increased, the motor performance of the outer rotor acoustic wave brushless motor is improved;
c. under the condition that the rotor large pitch angle C1, the rotor small pitch angle C2 and the magnet steel angle C3 are not changed, if the stator tooth angle E1 is increased, the motor performance of the outer rotor sound wave brushless motor is improved;
d. under the condition that the rotor large-spacing angle C1, the rotor small-spacing angle C2 and the stator tooth angle E1 are not changed, the angle of the magnetic steel angle C3 is properly reduced, and the cost is reduced;
e. the inner side angle of the stator teeth is adjusted, the size of an inner hole of the stator core 21 is reduced, the slot filling rate and the number of winding turns are improved, and therefore the motor performance of the outer rotor sound wave brushless motor is improved.
In this embodiment, the two coil windings 22 are driven by the driving current in the magnetic field formed by the magnetic steel 13 to generate magnetic force, and the current direction of the driving current is changed according to the preset frequency; the magnetic force generates acting force on the magnetic steel 13 to push the magnetic steel 13, and the magnetic steel 13 drives the rotor assembly to swing in the casing 31 in one direction; when the current direction of the driving current is changed, the two coil windings 22 generate magnetic force different from the magnetic force generated at the previous moment; the magnetic force with different magnetism generates acting force on the magnetic steel 13, the magnetic steel 13 is pulled, and then the magnetic steel 13 drives the rotor assembly to swing in the shell 31 in the direction opposite to the previous moment; the rotor assembly performs reciprocating circular oscillation in the housing 31 along the axis as the direction of the current changes. Therefore, high-frequency vibration generated by the reciprocating circular swing of the rotor component is transmitted to the outside through the shaft branch 11, if the brush head is additionally arranged at the tail end of the shaft branch 11, and a waterproof shell is assembled for the outer rotor sound wave brushless motor and the power supply equipment, so that the complete electric toothbrush is formed.
It should be understood that the vibration of the external rotor acoustic wave brushless motor is realized through the adaptive design of the rotor assembly and the stator assembly, so that the appearance and the size parameter design of the end cover assembly do not influence the operation of the rotor assembly and the stator assembly, and the end cover assembly can be designed into a circular shape, a square shape, an oblate shape or an irregular shape according to the appearance requirement of an actual product.
The switching frequency of the current direction is positively correlated with the swinging frequency of the rotor assembly, namely, the higher the switching frequency of the current direction is, the higher the swinging frequency of the rotor assembly is, so that the swinging frequency of the outer rotor sound wave brushless motor can be adjusted by presetting the driving current with different switching frequencies, the setting of different gears of the electric toothbrush is realized, and the electric toothbrush can be ensured to be selected to obtain proper high-frequency vibration gears by different users when being used.
In addition, in the radial section, the polarities of a group of magnetic steels 13 corresponding to the same stator tooth are different; and the two adjacent magnetic steels 13 which are positioned in different groups have the same polarity. When the stator is powered on and operated in the arrangement state, along the circumference of the axial section, the four magnetic steels 13 are stressed uniformly (stressed in the clockwise/anticlockwise directions) at the same moment, and the rotor assembly is driven to perform stable reciprocating circular swing on the periphery of the stator assembly
In this embodiment, the end cover assembly includes a casing 31 and a rear cover 32 installed in a matching manner, ball bearings 33 for bearing the shaft branch 11 are respectively disposed on the casing 31 and the rear cover 32, and the ball bearings 33 at one end of the rear cover 32 are clamped on the shaft branch 11 by using a clamp spring 34. Specifically, the two ball bearings 33 respectively bear the shaft branches 11 at two ends of the casing 31 and the rear cover 32 to ensure that the shaft branches 11 are located at the axial center position, and in addition, the ball bearing 33 at one side of the casing 31 is tightly pressed and fixed to a center hole of the casing 31, the ball bearing 33 at one side of the rear cover 32 is tightly pressed and fixed to a center hole at the end part of the rear cover 32, and a snap spring 34 is tightly clamped to a bayonet on the shaft branches 11 to ensure that the shaft branches 11 and the rear cover 32 are firmly combined without loosening.
In conclusion, the outer rotor acoustic wave brushless motor realizes stable high-frequency vibration output and improves the energy efficiency ratio on the premise of not depending on the rigidity and toughness of the material by reasonably designing the assembly relationship between the rotor assembly and the stator assembly; in addition, the simple structural design has lower failure rate and ideal service life.
Claims (8)
1. An outer rotor acoustic brushless motor, comprising:
the rotor assembly, the stator assembly and the end cover assembly;
the rotor assembly comprises a shaft branch (11), a magnetic steel protective sleeve (12) penetrating through the shaft branch (11), magnetic steel (13) arranged on the magnetic steel protective sleeve (12) and a rotor shell (14) coated outside the magnetic steel protective sleeve (12);
the stator assembly comprises a stator core (21) mounted on the end cover assembly, and coil windings (22) wound on stator teeth of the stator core (21);
the end cover assembly comprises a machine shell (31) and a rear cover (32) which are installed in a matched mode, ball bearings (33) for bearing the shaft branches (11) are respectively arranged on the machine shell (31) and the rear cover (32), and the ball bearings (33) at one end of the rear cover (32) are clamped on the shaft branches (11) through clamp springs (34).
2. The external rotor acoustic brushless motor of claim 1, comprising:
the radial section of the magnetic steel protective sleeve (12) is in an axisymmetric shape, two mounting hole sites are respectively arranged on two sides of the symmetric axis, and the magnetic steel (13) is respectively and firmly mounted at four mounting hole sites on the magnetic steel protective sleeve (12);
the rotor shell (14) is coated outside the magnetic steel protective sleeve (12) and limits and reinforces the magnetic steel (13) arranged on the magnetic steel protective sleeve (12).
3. The external rotor acoustic brushless motor of claim 2, comprising:
the radial section of the stator core (21) is in an axial symmetry shape, two sides of the symmetry axis are respectively provided with two stator teeth, and enameled wires are respectively wound on the two stator teeth along the axial direction to obtain the coil winding (22);
wherein the number of turns of the two coil windings (22) is the same.
4. The external rotor acoustic brushless motor of claim 3, comprising:
the rotor assembly is mounted on the shaft branch (11) and penetrates through the central hole of the stator core (21) along with the shaft branch (11), so that the rotor assembly and the stator assembly are assembled in an axial concentric mode, and an air gap exists between the rotor assembly and the stator assembly;
the mounting position of the magnetic steel (13) distributed on the magnetic steel protective sleeve (12) is matched with the shape of the radial section of the stator teeth on the two sides of the stator core (21);
magnet steel protective sheath (12) arbitrary side two magnet steel (13) are a set of, right stator core (21) one side the stator tooth adsorbs, promptly magnet steel protective sheath (12) both sides two sets ofly magnet steel (13) adsorb respectively stator core (21) both sides the stator tooth, thereby magnet steel (13) reach magnet steel protective sheath (12) are radial relative stator module is in the suspended state, promptly the rotor subassembly suspend in the stator module outside.
5. The external rotor acoustic brushless motor of claim 4, comprising:
under the suspension state, along the radial section, the extended line of the connecting line of the axis and the outer edges of the two ends of the stator tooth divides the section of the magnetic steel;
the intersection point of the extension line on the inner side of the section of the magnetic steel is taken as a boundary, one side of the section of the magnetic steel, which is on the same side with the stator iron core (21), is a self-suction surface of the magnetic steel (13), and the area of the section of the magnetic steel, excluding the self-suction surface, is a non-self-suction surface; wherein the area of the self-suction surface is constantly larger than that of the non-self-suction surface;
aiming at the outer edge of any one magnetic steel section and the outer edges of two adjacent magnetic steel sections, a rotor large spacing angle C1 and a rotor small spacing angle C2 are obtained by connecting based on the axis;
the included angle between the axis and the connecting line of the outer edges of any stator tooth is a stator tooth angle E1;
and the included angle between the axis and the connecting line of the two ends of the outer edge of the section of the magnetic steel is a magnetic steel angle C3 of the magnetic steel (13).
6. The external rotor acoustic brushless motor of claim 5, comprising:
the performance of the outer rotor acoustic wave brushless motor is influenced by the size parameters and the arrangement mode of the magnetic steel (13);
under the condition that the magnetic steel angle C3 is not changed, if the rotor large-distance angle C1 is increased and/or the rotor small-distance angle C2 is decreased, the motor performance of the outer rotor sound wave brushless motor is improved;
under the condition that the rotor small-distance angle C2 is not changed, if the rotor large-distance angle C1 is reduced and/or the magnet steel angle C3 is increased, the motor performance of the outer rotor sound wave brushless motor is improved;
in addition, when the rotor large pitch angle C1, the rotor small pitch angle C2 and the magnet steel angle C3 are not changed, if the stator tooth angle E1 is increased, the motor performance of the outer rotor acoustic wave brushless motor is improved;
furthermore, when the rotor large pitch angle C1, the rotor small pitch angle C2, and the stator tooth angle E1 are not changed, the cost is reduced by appropriately decreasing the angle of the magnet angle C3;
in addition, the inner side angle of the stator teeth is adjusted, the size of an inner hole of the stator core (21) is reduced, the slot filling rate and the number of winding turns are improved, and therefore the motor performance of the outer rotor sound wave brushless motor is improved.
7. The external rotor acoustic brushless motor of claim 6, comprising:
the two coil windings (22) are driven by driving current in a magnetic field formed by the magnetic steel (13) to generate magnetic force, and the current direction of the driving current is changed according to preset frequency;
the magnetic force generates acting force on the magnetic steel (13) to push the magnetic steel (13), and then the magnetic steel (13) drives the rotor assembly to swing towards one direction in the shell (31);
when the current direction of the driving current is changed, the two coil windings (22) generate magnetic force different from the magnetic force at the previous moment;
the magnetic force with different magnetism generates acting force on the magnetic steel (13), the magnetic steel (13) is pulled, and then the magnetic steel (13) drives the rotor assembly to swing in the shell (31) in the direction opposite to the previous moment;
along with the change of the current direction, the rotor assembly performs reciprocating circular oscillation in the machine shell (31) along the axis;
the change frequency of the current direction is positively correlated with the swing frequency of the rotor assembly.
8. The external rotor acoustic brushless motor of claim 7, comprising:
in the radial section, a group of magnetic steels (13) corresponding to the same stator tooth have different polarities;
two adjacent magnetic steels (13) which are positioned in different groups have the same polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121236120.3U CN216146227U (en) | 2021-06-03 | 2021-06-03 | External rotor sound wave brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121236120.3U CN216146227U (en) | 2021-06-03 | 2021-06-03 | External rotor sound wave brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216146227U true CN216146227U (en) | 2022-03-29 |
Family
ID=80801683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121236120.3U Active CN216146227U (en) | 2021-06-03 | 2021-06-03 | External rotor sound wave brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216146227U (en) |
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2021
- 2021-06-03 CN CN202121236120.3U patent/CN216146227U/en active Active
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