CN109687627A - A kind of external-rotor DC. brush-less and dynamical system - Google Patents
A kind of external-rotor DC. brush-less and dynamical system Download PDFInfo
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- CN109687627A CN109687627A CN201811357714.2A CN201811357714A CN109687627A CN 109687627 A CN109687627 A CN 109687627A CN 201811357714 A CN201811357714 A CN 201811357714A CN 109687627 A CN109687627 A CN 109687627A
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- propeller
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- 238000005183 dynamical system Methods 0.000 title claims abstract description 9
- 238000009434 installation Methods 0.000 claims abstract description 21
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical group O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Dc Machiner (AREA)
Abstract
The present invention provides a kind of external-rotor DC. brush-less, adapter is installed including rotor, stator module, motor cabinet, axis and propeller, the motor cabinet is for installing rotor and stator module, the axis is set in motor cabinet inner cavity, and the rotor, propeller installation adapter are fixed with axis；Be provided with bearing chamber in the inner cavity of the motor cabinet, in the bearing chamber it is coaxial it is adjacent be stacked several bearings, the bearing chamber is being provided with axial bearing surface for abutting the end face of the bearing close to propeller side close to propeller side；It is provided with inner ring locking lid and outer ring locking lid below the bearing chamber, for carrying out support positioning to bearing.It is combined into double-motor power system by 2 above-mentioned motor a positive and a negative, is capable of providing bigger power.Above-mentioned motor and dynamical system, shaft strength is good, and bearing chamber machining accuracy is high, and concentricity is high, and abrasion is small, is less prone to race circle phenomenon.
Description
Technical field
The present invention relates to motor field, especially a kind of DC brushless motor.
Background technique
DC brushless motor is one of motor common form, be widely used in as automobile, tool, industrial industry control, from
The fields such as dynamicization and aerospace.In DC brushless motor, armature winding is arranged on stator, and permanent magnet pole is set
It sets on rotor.Position of each phase armature winding of stator relative to rotor permanent magnet magnetic field, is led to by the position sensor on rotor
It crosses electronically or electromagnetic mode is perceived；And its output signal is utilized, by electronic commutation circuit, according to certain logic journey
Sequence goes driving, around the corresponding power switch transistor being connected, to control current switch with armature or commutate to corresponding armature
Winding.With the rotation of rotor, rotor-position sensor constantly sends out signal, causes armature winding successively leading to constantly
Electricity is constantly changing energized state, so that the current direction flowed through in the coil-conductor under a certain magnetic pole is constant always,
Here it is the essence of the Contactless electronic of brushless direct current permanent magnet motor commutation.
Generally speaking, brshless DC motor can be divided into following three kinds of main applications:
Continuous loading application: mainly needing certain revolving speed but the field of less demanding to rotary speed precision, such as fan,
The application of the one kind such as water pumper, hair dryer, this kind of application cost is lower and mostly opened loop control.
Variable load application: being mainly the application that revolving speed needs to change within the scope of some, to motor speed characteristic and moves
State response time properties have higher demand.If in household appliance, dryer and compressor are exactly good example, automobile work
Oil pump control, electric controller, engine control in industry field etc., the system cost of this kind of application is more relatively higher.
Positioning application: most of Industry Controls and the application for automatically controlling aspect belong to this classification, past in this kind of application
Toward the conveying of energy can be completed, so the dynamic response and torque to revolving speed have special requirement, the requirement to controller also compared with
It is high.Photoelectricity and some synchronizers may be used when testing the speed.Process control, Mechanical course and transport control etc. much belong to
This kind of application.
In DC brushless motor, it is divided into outer rotor brush DC and inner-rotor brushless electricity according to rotor design is still outer inside
Machine.The common form of external-rotor DC. brush-less therein is as shown in Fig. 1, is widely used in multi-rotor unmanned aerial vehicle
On.The structure includes axis 1, rotor 2, stator module 3, motor cabinet 4, locking lid 5, propeller installation adapter 6, upper bearing (metal) 7-
1 and lower bearing 7-2.Wherein motor cabinet 4 is convex shape, and intermediate cavity is arranged in the cavity of motor cabinet 4 for accommodating axis 1
There are the upper bearing (metal) room being separated from each other and lower bearing room, be respectively arranged with bearing surface in upper bearing (metal) room and lower bearing room, wherein upper axis
The bearing surface for holding room installs 6 side of adapter towards propeller, and towards 4 side of motor cabinet, two are supported the bearing surface of lower bearing room
Junction is respectively configured to provide the positioning of upper bearing (metal) 7-1 and lower bearing 7-2, and the outside of 4 cavity of motor cabinet is for installing stator module 3
And rotor 2, while rotor 2 and axis 1 are bolted to transmit rotation, during propeller installation adapter 6 is also secured at
To transmit axial force outward on axis 1, it is embodied on unmanned plane and upward lift is provided for unmanned plane.The locking lid 5 is arranged
In 4 cavity of motor cabinet bottom and be fixed for support lower bearing 7-2 with axis 1.
Above structure and disadvantage are mainly:
Since motor is used for multi-rotor unmanned aerial vehicle, the load of motor is propeller, and propeller rotation generates upward drawing
Power, therefore upper bearing (metal) 7-1 and lower bearing 7-2 are primarily subjected to axial force, but electric machine structure receiving axial force ability is poor.Reason
It is as follows:
First is that because of the discrete structure design of two bearing chambers inside motor, prevent suffered axial force is from being uniformly distributed
Onto upper and lower two bearings, mainly born by bottom end bearing.
Second is that the deep groove ball bearing receiving axial force ability of the Selection of Bearings in traditional electric machine structure is poor, major embodiment
It is also easy to produce opposite sliding (commonly referred to as run and enclose) when motor rotates in axis and bearing inner race, high temperature is generated when serious and burns out axis and axis
It holds, makes motor premature failure.Above situation Producing reason is first is that because axis and bearing inner race use cooperation for convenience of assembly
It is not very tight transition fit；Second is that other effective ways is not taken to prevent from running circle under this mated condition yet.
In addition to above-mentioned two problems, the motor of this kind of structure technology big there is also two bearings room ensuring coaxiality difficulty
Problem.Since metal (upper room is at motor cabinet both ends, it is typically difficult to simultaneous processing, the bearing chamber for processing one end will be turned round motor
Seat again clamping process other end bearing chamber, therefore concentricity it is difficult to ensure that.It just will affect axis and bearing since concentricity is bad
Assembly precision increases bearing service wear.
Summary of the invention
It is an object of that present invention to provide a kind of external-rotor DC. brush-less, for solving traditional DC brushless motor axis
The technical problem that endurance ability is poor, wear and aging is fast.
To reach above-mentioned purpose, the following technical solutions are proposed by the present invention:
A kind of external-rotor DC. brush-less, including rotor, stator module, motor cabinet, axis and propeller installation switching
Part, the motor cabinet is for installing rotor and stator module, and the axis is set in motor cabinet inner cavity, the rotor, spiral
Paddle installation adapter is fixed with axis.
It is provided with bearing chamber in the inner cavity of the motor cabinet, it is coaxial in the bearing chamber adjacent to be stacked several axis
It holds, the bearing chamber is being provided with axial bearing surface for abutting the bearing close to propeller side close to propeller side
End face；
It is provided with inner ring locking lid and outer ring locking lid below the bearing chamber, the inner ring locking lid is fixed on axis bottom
Portion, and bearing described in support is close to the inner ring of the end face of propeller opposite side；The outer ring locking lid is fixed on motor cabinet
Upper and outer ring locking lid is for bearing described in support close to the outer ring of the end face of propeller opposite side.
Further, in the present invention, rubber parts is provided between the bearing and axis.
Further, in the present invention, the outer ring locking lid includes mounting seat and bracing ring, and the mounting seat is
The outer position pair on the inner ring of annular and with close outer ring locking lid side bearing face is arranged in annular, the bracing ring
It answers.
In addition to above-mentioned motor, invention additionally discloses one kind based on dynamical system made of above-mentioned motor, the dynamical system packet
Include two above-mentioned motors and installation adapter and support arm for connecting two motors, described two motors with perpendicular to
The face of motor axis be it is symmetrical, be utilized respectively respective motor cabinet and be fixed on installation adapter, the installation adapter is arranged
In on support arm.Thus the double paddle dynamical systems of the coaxial bi-motor formed, can provide more powerful liter for multi-rotor unmanned aerial vehicle
Power.
From the above technical scheme, the present invention provides a kind of external-rotor DC. brush-less, above-mentioned motor is changed
The form of bearing chamber becomes 1 independent bearing chamber from original 2 discrete bearing chambers, and the abutting on bearing chamber is arranged
Face is located at close to propeller installation adapter side to provide the positioning to bearing, the indoor coaxial cloth of bearing adjacent sequential of bearing
It sets, and support is carried out by the inner ring locking lid of lower section and outer ring locking lid, while mentioning close to motor base side to bearing
For locking and limiting.By above-mentioned inner ring locking lid and outer ring locking lid energy reliable delivery axial force, and keep total not
Vibration does not loosen.
By the setting of above-mentioned bearing chamber, so that the indoor shaft strength of bearing is uniform and bearing chamber can be disposably processed into
Type, it is easy to process, the low technical problem of discrete bearing chamber working axiality is reduced, the cooperation essence of axis and bearing is improved
Degree, reduces abrasion.
Further, using angular contact bearing, and coaxial sequence is installed, and bearing is able to bear bigger axial force.
Finally, rubber parts is arranged between bearing and axis, the frictional force between axis and bearing can be increased, and improve
The axial clamping force of bearing internal external circle prevents bearing from running circle phenomenon.
Motor of the invention is subjected to continuous service test in 72 hours, motor is intact, and axis and bearing do not occur running circle
Phenomena such as burning out, performance are substantially better than conventional motors, can satisfy the requirement of multi-rotor unmanned aerial vehicle long-play.
It should be appreciated that as long as aforementioned concepts and all combinations additionally conceived described in greater detail below are at this
It can be viewed as a part of the subject matter of the disclosure in the case that the design of sample is not conflicting.
Can be more fully appreciated from the following description in conjunction with attached drawing present invention teach that the foregoing and other aspects, reality
Apply example and feature.The features and/or benefits of other additional aspects such as illustrative embodiments of the invention will be below
Description in it is obvious, or learnt in practice by the specific embodiment instructed according to the present invention.
Detailed description of the invention
Attached drawing is not intended to drawn to scale.In the accompanying drawings, identical or nearly identical group each of is shown in each figure
It can be indicated by the same numeral at part.For clarity, in each figure, not each component part is labeled.
Now, example will be passed through and the embodiments of various aspects of the invention is described in reference to the drawings, in which:
Fig. 1 is the schematic diagram of the common form of external-rotor DC. brush-less；
Fig. 2 is a kind of external-rotor DC. brush-less schematic diagram of the embodiment of the present invention；
Fig. 3 is the schematic diagram of the dynamical system formed based on the motor in specific embodiments of the present invention；
The meaning of each appended drawing reference is as follows:
Axis 1, rotor 2, stator module 3, motor cabinet 4, inner ring locking lid 5, propeller installation adapter 6, bearing surface 7,
Bearing 8, outer ring locking lid 9, rubber parts 10, installation adapter 11, support arm 12.
Specific embodiment
In order to better understand the technical content of the present invention, special to lift specific embodiment and institute's accompanying drawings is cooperated to be described as follows.
Various aspects with reference to the accompanying drawings to describe the present invention in the disclosure, shown in the drawings of the embodiment of many explanations.
It is not intended to cover all aspects of the invention for embodiment of the disclosure.It should be appreciated that a variety of designs and reality presented hereinbefore
Those of apply example, and describe in more detail below design and embodiment can in many ways in any one come it is real
It applies, this is because conception and embodiment disclosed in this invention are not limited to any embodiment.In addition, disclosed by the invention one
A little aspects can be used alone, or otherwise any appropriately combined use with disclosed by the invention.
As shown in Fig. 2, being a kind of external-rotor DC. brush-less of specific embodiments of the present invention, including rotor 2, stator
Component 3, motor cabinet 4, axis 1 and propeller install adapter 6, and the motor cabinet 4 is for installing rotor 2 and stator module 3, institute
It states axis 1 to be set in 4 inner cavity of motor cabinet, the rotor 2, propeller installation adapter 6 are fixed with axis 1.
It is provided with bearing chamber in the inner cavity of the motor cabinet 4, it is coaxial in the bearing chamber adjacent to be stacked several axis
8 are held, the bearing chamber is being provided with axial bearing surface 7 for abutting the bearing close to propeller side close to propeller side
8 end face.
It is provided with inner ring locking lid 5 and outer ring locking lid 9 below the bearing chamber, during the inner ring locking lid 5 is fixed on
1 bottom of axis, and inner ring of the bearing 8 close to the end face of propeller opposite side described in support.The outer ring locking lid 9 is fixed on
On motor cabinet 4 and outer ring locking lid 9 is used for bearing 8 described in support close to the outer ring of the end face of propeller opposite side.Inner ring lock
The effect of tight lid 5 and outer ring locking lid 9 be by the locking and limit to 8 Internal and external cycle of bearing, first is that can reliable delivery axial force,
Second is that being able to maintain total, vibration does not loosen.
Using the bearing chamber of above-mentioned form, bearing 8 is uniform in axially loaded, and bearing chamber is processed and formed at one time, coaxially
Degree is high.
More preferably, in certain specific embodiments, it is provided with rubber parts 10 between the bearing 8 and axis 1, on
Rubber parts 10 is stated for improving the frictional force between axis 1 and bearing 8, while the circular runout for controlling 8 Internal and external cycle of bearing is empty
Between, so that the axial clamping force of 8 Internal and external cycle of bearing further increases, to reduce a possibility that bearing 8 runs circle.Above-mentioned rubber
Part 10 is specific to be occurred in the form of rubber ring in the present embodiment, and the rubber ring groove of adaptation is provided on axis 1 for pacifying
Rubber ring is filled, and rubber ring groove is corresponding with 8 position of bearing, so that each bearing 8 at least distributes a rubber ring, in order to make rubber
Cushion rubber is equably applied on bearing 8, and the position of the rubber ring corresponds to 8 middle position of bearing.
More details, as shown in Fig. 2, the outer ring locking lid 9 includes mounting seat and bracing ring, the mounting seat
For annular, shown 4 end face of motor cabinet is provided with annular groove, shown annular groove and mounting seat in 4 inner cavity periphery of motor cabinet
Adaptation, shown mounting seat setting are fixed in above-mentioned annular groove, and through fixing pieces such as bolts.The bracing ring setting
It is on the inner ring of annular and corresponding with close to the outer position of 9 one side bearing of outer ring locking lid, 8 end face, for 8 outer ring of bearing
Supporting role is provided.Correspondingly, inner ring locking lid 5 is fixed on 1 bottom of axis, and inner ring locking lid 5 by fixing pieces such as bolts
Capping cover the inner round portion of bearing 8, for providing supporting role to 8 inner ring of bearing.
More details, in order to enhance bearing 8 in axial stress, selecting the bearing 8 is angular contact bearing 8, such as Fig. 2
It is shown, preferably 2 double row angular contact bearings 8 in the present embodiment.
By the setting of above-mentioned bearing chamber, so that the indoor shaft strength of bearing is uniform and bearing chamber can be disposably processed into
Type, it is easy to process, the low technical problem of discrete bearing chamber working axiality is reduced, the cooperation essence of axis and bearing is improved
Degree, reduces abrasion.
Finally, rubber parts is arranged between bearing and axis, the frictional force between axis and bearing can be increased, and improve
The axial clamping force of bearing internal external circle prevents bearing from running circle phenomenon.
Above-mentioned motor is subjected to continuous service test in 72 hours, motor is intact, and axis and bearing do not occur race circle and burn out
Phenomena such as, performance is substantially better than conventional motors, can satisfy the requirement of multi-rotor unmanned aerial vehicle long-play.
Based on above-mentioned motor, a kind of dynamical system is provided referring to Fig. 3, which includes two above-mentioned motors and use
In the installation adapter 11 and support arm 12 that connect two motors, described two motors are to be pair perpendicular to the face of motor axis 1
Claim, is utilized respectively respective motor cabinet 4 and is fixed on installation adapter 11, the installation adapter 11 is set to support arm 12
On.Shown support arm 12 is fixed on unmanned plane, for driving the fuselage of unmanned plane.
Here one, two motors is positive to install, a reversed installation, and turning to is also on the contrary, for balancing rotation
It changes the line of production and raw torque and provides unmanned plane upward lift jointly.Specific stress is as follows:
It is forward mounted motor, the lift which drives propeller rotation to generate for the motor of top in Fig. 3
By 8 inner rings of axis 1 → inner ring, 5 → bearing of locking lid → 8 outer rings of bearing → motor cabinet 4 → installation adapter → support arm 12 →
Unmanned fuselage.
For the motor of lower section in Fig. 3, for the motor reversely installed, the lift that motor drives propeller rotation to generate is logical
Cross axis 1 and 2 → bearing of rotor 8 inner rings → 8 outer rings of bearing → outer ring 9 → motor cabinet of locking lid 4 → installation adapter → support
Arm 12 → unmanned fuselage.
The lift that motor generates up and down as a result, drives unmanned plane during flying by support arm 12 jointly.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the range that protection scope of the present invention is limited when view claim.
Claims (5)
1. a kind of external-rotor DC. brush-less, including rotor, stator module, motor cabinet, axis and propeller install adapter,
For installing rotor and stator module, the axis is set in motor cabinet inner cavity the motor cabinet, the rotor, propeller peace
Dress adapter is fixed with axis, it is characterised in that:
It is provided with bearing chamber in the inner cavity of the motor cabinet, it is coaxial in the bearing chamber adjacent to be stacked several bearings, institute
It states bearing chamber and is being provided with axial bearing surface for abutting the end face of the bearing close to propeller side close to propeller side；
It is provided with inner ring locking lid and outer ring locking lid below the bearing chamber, the inner ring locking lid is fixed on axis bottom,
And bearing described in support is close to the inner ring of the end face of propeller opposite side；The outer ring locking lid be fixed on motor cabinet and
Outer ring locking lid is for bearing described in support close to the outer ring of the end face of propeller opposite side.
2. a kind of external-rotor DC. brush-less according to claim 1, it is characterised in that: between the bearing and axis
It is provided with rubber parts.
3. a kind of external-rotor DC. brush-less according to claim 1, it is characterised in that: the outer ring locking lid includes
Mounting seat and bracing ring, the mounting seat are annular, the bracing ring be arranged on the inner ring of annular and with close to outer ring
The outer position of locking lid side bearing face is corresponding.
4. a kind of external-rotor DC. brush-less described in any one in -3 according to claim 1, it is characterised in that: the axis
It holds as angular contact bearing.
5. a kind of dynamical system, it is characterised in that: including motor described in any one in two the claims 1-4 and
For connecting the installation adapter and support arm of two motors, described two motors with the face perpendicular to motor axis be it is symmetrical,
It is utilized respectively respective motor cabinet to be fixed on installation adapter, the installation adapter is set on support arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811357714.2A CN109687627A (en) | 2018-11-15 | 2018-11-15 | A kind of external-rotor DC. brush-less and dynamical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811357714.2A CN109687627A (en) | 2018-11-15 | 2018-11-15 | A kind of external-rotor DC. brush-less and dynamical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109687627A true CN109687627A (en) | 2019-04-26 |
Family
ID=66184626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811357714.2A Pending CN109687627A (en) | 2018-11-15 | 2018-11-15 | A kind of external-rotor DC. brush-less and dynamical system |
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| Country | Link |
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| CN (1) | CN109687627A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111999059A (en) * | 2020-09-02 | 2020-11-27 | 洛阳轴承研究所有限公司 | Device for testing bearing slipping rate and testing system using device |
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| CN205311899U (en) * | 2015-12-25 | 2016-06-15 | 广州亿航智能技术有限公司 | Many rotors manned vehicle |
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| CN205469814U (en) * | 2016-03-31 | 2016-08-17 | 深圳市大疆创新科技有限公司 | Motor and have power device , Unmanned vehicles of this motor |
| CN107786024A (en) * | 2016-08-31 | 2018-03-09 | 斯凯孚磁性机械技术公司 | Land bearing assembly and equipped with this component and the rotating machinery of magnetic bearing |
| CN107919763A (en) * | 2018-01-04 | 2018-04-17 | 北京小米移动软件有限公司 | Horizontal stage electric machine, holder and unmanned plane |
| CN209104939U (en) * | 2018-11-15 | 2019-07-12 | 江苏无线电厂有限公司 | A kind of external-rotor DC. brush-less and dynamical system |
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| CN2376130Y (en) * | 1999-05-14 | 2000-04-26 | 台达电子工业股份有限公司 | Motor |
| CN2379964Y (en) * | 1999-06-03 | 2000-05-24 | 台达电子工业股份有限公司 | Thin type electric motor |
| JP2001234927A (en) * | 1999-12-03 | 2001-08-31 | Nsk Ltd | Small-sized motor for information device and rolling bearing for the small-sized motor |
| CN101140011A (en) * | 2006-03-13 | 2008-03-12 | 滚动轴承美国公司 | Tandem stack angular contact bearing for rotary wing aircraft |
| CN101794524A (en) * | 2009-12-15 | 2010-08-04 | 中国民航大学 | Aircraft attitude-simulating 3-degree-of-freedom electrical turntable |
| JP2014075879A (en) * | 2012-10-03 | 2014-04-24 | Sim-Drive Co Ltd | Outer rotor in-wheel motor |
| CN205311899U (en) * | 2015-12-25 | 2016-06-15 | 广州亿航智能技术有限公司 | Many rotors manned vehicle |
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| CN209104939U (en) * | 2018-11-15 | 2019-07-12 | 江苏无线电厂有限公司 | A kind of external-rotor DC. brush-less and dynamical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111999059A (en) * | 2020-09-02 | 2020-11-27 | 洛阳轴承研究所有限公司 | Device for testing bearing slipping rate and testing system using device |
| CN111999059B (en) * | 2020-09-02 | 2022-06-28 | 洛阳轴承研究所有限公司 | Bearing is beaten slip rate test and is used device and use device's test system |
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