CN207926376U - A kind of brshless DC motor - Google Patents
A kind of brshless DC motor Download PDFInfo
- Publication number
- CN207926376U CN207926376U CN201820011113.5U CN201820011113U CN207926376U CN 207926376 U CN207926376 U CN 207926376U CN 201820011113 U CN201820011113 U CN 201820011113U CN 207926376 U CN207926376 U CN 207926376U
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- brshless
- iron core
- pwm
- circuit board
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Abstract
The utility model discloses a kind of brshless DC motors, including iron core, iron core winding, drive circuit board and motor top cover with PWM driving lines, PWM drives line is corresponding with the UVW three-phase input ends of iron core winding to be respectively connected, it is additionally provided on drive circuit board along the axially extending metallic conductor of motor, metallic conductor one end is electrically connected with iron core, the other end is electrically connected with motor top cover, and motor top cover is electrically connected by the circuit of capacitance and drive circuit board.The electromagnetic radiation of brshless DC motor is significantly reduced by way of increasing metallic conductor, and also very limited for the weight increase of entire brshless DC motor, overall structure is simple, and electromagnetic radiation inhibition is notable.
Description
Technical field
The utility model is related to EMC Design field, more specifically to a kind of brshless DC motor.
Background technology
Either industrial circle or daily life field, motor are all very common power output device.With automobile
For, just comprising large number of motor in auto electric framework, such as fan, the driving device of all kinds of pumps, glass for vehicle window driving
Device etc., since BLDC (Brushless Direct Current, brushless direct-current) motor has, speed adjusting performance is good, and structure is simple
Single, high reliability, therefore its application on automobile is also more and more extensive.
For BLDC motors with electronic commutator instead of mechanical commutator and carbon brush, operation principle is generated using driver
PWM (Pulse Width Modulation, pulsewidth modulation) drive signal, is supplied to the UVW three-phase input ends of BLDC motors, from
And driving motor operates.
The PWM driving frequencies of the BLDC motors used on automobile are generally between 10~100kHz, and harmonic wave is up to up to a hundred
MHz, and electric current is larger is more important electromagnetic interference source, the power input and drive that system can be in driver when working
Dynamic output end generates apparent electromagnetic interference, may influence the work of other on-vehicle parts and wireless device.
There are mainly two types of the means for reducing electromagnetic interference at present, one is full metal jacket is used, BLDC motors
It is mounted in metal shell with driver, makes driving circuit to the pwm signal of motor three-phase input end completely by metal shell screen
It covers；Another kind is that the pwm signal line of driver to motor three-phase input end is shielded using shielding line or barricade, is inhibited
Its external Radiative EMI.
However, first way is due to using metal shell, it is of high cost, and lead to entire brshless DC motor
Weight it is very big, do not meet the cost effective and light-weighted development trend of current electronic product；The second way can only be specific
Electric machine structure under be applicable in, smaller scope of application, and that there is costs is higher, weight is larger, complex treatment process is asked
Topic.
Utility model content
In view of this, the utility model discloses a kind of brshless DC motor, so as to it is simple in structure, do not use shielding gold
Category shell under the premise of not dramatically increasing motor weight, effectively inhibits the electromagnetic radiation of brshless DC motor, ensures that other are vehicle-mounted
Component and wireless device can normally and reliably work.
To achieve the above object, the brshless DC motor disclosed in the utility model, including iron core, iron core winding, band
Have the drive circuit board of PWM driving lines and a motor top cover of metal material, PWM driving line respectively with the iron core winding
UVW three-phase input ends correspond to be connected, be additionally provided on the drive circuit board along the axially extending metallic conductor of motor, it is described
Metallic conductor one end is electrically connected with the iron core, and the other end is electrically connected with the motor top cover, and the motor top cover is logical
Capacitance is crossed to be electrically connected with the circuit of the drive circuit board.
Preferably, the metallic conductor is along the axially extending copper bar of motor.
Preferably, the PWM drivings line is provided in the axially extending of the motor, the iron core for accommodating
State the holding tank of PWM driving lines, and inserting groove corresponding with the metallic conductor, wherein described in the metallic conductor is inserted into
Realization electrical connection is contacted in inserting groove and with the iron core.
Preferably, be provided with structurally on the drive circuit board, and with the metal elastic being structurally electrically connected
Piece, wherein it is described structurally to be formed by the copper conductor being laid on the drive circuit board, after motor top cover assembly with institute
Metal clips is stated to compress and realize electrical connection；The motor top cover by it is described structurally and the capacitance and the driving
Connect to the circuit of circuit board.
Preferably, the capacitance is ceramic condenser.
Preferably, intermediate PWM driving lines include along the axially extending of motor, the PWM driving lines of both sides：
For being connected with the drive circuit board and along the axially extending wiring section of motor；
For being connected with the iron core winding and along the axially extending extraction section of motor；
Connect the extraction section and the wiring section, and the middle part bending segment of PWM driving line bendings towards the middle.
Preferably, the middle part bending segment includes that the first transverse direction walks line segment, the second transverse direction walks line segment and axially walks line segment,
In,
Described first first end for laterally walking line segment is connected with the extraction section, and the PWM of second end towards the middle drives
Moving-wire extends；Described second first end for laterally walking line segment is connected with the wiring section, and the PWM of second end towards the middle drives
Moving-wire extends；The axial direction walks line segment and laterally walks the second end of line segment by described first and described second laterally walk line segment
Second end connects.
Preferably, the axial direction walks the distance between line segment and intermediate PWM driving lines no more than 1cm.
Preferably, described second line segment is laterally walked at a distance from the drive circuit board no more than 1cm.
Preferably, the shell of the brshless DC motor is plastic shell.
Those skilled in the art are known, and PWM drives the radiation hair that the loop of line relative to the earth or structurally externally couples
Composition common mode interference is penetrated, identical in interference electric current intensity, the area of loop is bigger, and electromagnetic radiation is stronger.
Metallic conductor is provided in the utility model on drive circuit board, one end of metallic conductor electrically connects with iron core
It connects, the other end is electrically connected with motor top cover, and motor top cover is electrically connected by the circuit of capacitance and drive circuit board.This is just
To drive line to provide one as the PWM of interference source being total to for line is driven comprising motor top cover, metallic conductor, iron core and PWM
Mould interferes circuit, and for original common mode interference circuit, the loop area in the common mode interference circuit newly formed subtracts significantly
It is small, therefore electromagnetic radiation efficiency is very low, to effectively inhibit common mode electromagnetic radiation.
It can be seen that the electricity of brshless DC motor is significantly reduced in the utility model by way of increasing metallic conductor
Magnetic radiation, and it is also very limited for the weight increase of entire brshless DC motor, and overall structure is simple, is not using shielding
Under the premise of scheme, electromagnetic radiation inhibition is notable, due to not using metal shell to be shielded, brshless DC motor
Production cost be also decreased obviously.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the part-structure exploded perspective view of the brshless DC motor disclosed in the utility model first embodiment；
Fig. 2 is the mating schematic diagram of the drive circuit board and iron core disclosed in the utility model first embodiment；
Motor top covers and the connection of drive circuit board and iron core of the Fig. 3 disclosed in the utility model first embodiment are shown
It is intended to；
Fig. 4 is the mating schematic diagram of the drive circuit board and iron core disclosed in the utility model second embodiment；
Motor top covers and the connection of drive circuit board and iron core of the Fig. 5 disclosed in the utility model second embodiment are shown
It is intended to.
Wherein, 1 is iron core, and 2 be shell, and 3 be drive circuit board, and 4 be motor top cover, and 31 drive line for PWM, and 32 be metal
Conductor, 33 be metal clips.
Specific implementation mode
The core of the utility model is to provide a kind of brshless DC motor, so as to simple in structure and do not dramatically increase motor
Under the premise of weight, effectively inhibits the electromagnetic radiation of brshless DC motor, ensure that other on-vehicle parts and wireless device can be just
It works often and reliably.
In order to make those skilled in the art more fully understand the utility model, implement with reference to the utility model
Attached drawing in example, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described reality
It is only the utility model a part of the embodiment to apply example, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this reality
With novel protected range.
Please also refer to Fig. 1 to Fig. 5, the brshless DC motor disclosed in the utility model, including iron core 1, iron core around
Group, drive circuit board 3 and motor top cover 4, PWM driving lines 31 are provided on drive circuit board 3, and PWM drives line 31 and iron core
UVW three-phase input ends in winding are correspondingly connected with, therefore it is also three that PWM driving lines 31 are practical, as it is shown in the figures, except this it
Outside, in brshless DC motor disclosed in an embodiment of the present invention, the axial direction along motor is additionally provided on drive circuit board 3
The metallic conductor 32 of extension, one end and the iron core 1 of the metallic conductor 32 are electrically connected, and the other end is electrically connected with motor top cover 4,
Motor top cover is electrically connected by the circuit of capacitance and drive circuit board.
It needs to illustrate, actually can be understood as to circuit the cathode of power supply and signal, on a printed circuit,
Because component is very more, circuit can be caused very cumbersome if each circuit goes to connect cathode with line, therefore can be on circuit boards
Specially deposited copper plane is as cathode, and the cathode of all circuits is connected to this plane, this plane is known as the electricity of circuit board
Lu Di.
The electromagnetic radiation knowledge being had according to those skilled in the art is it is found that PWM drives line relative to the earth or structure
The radiation-emitting that the loop on ground externally couples constitutes common mode interference, the area of loop identical in interference electric current intensity
Bigger, electromagnetic radiation is stronger.
In brshless DC motor disclosed in above-described embodiment, metallic conductor 32, gold are provided on drive circuit board 3
The one end and iron core 1 for belonging to conductor 32 are electrically connected, and the other end is electrically connected with motor top cover 4, and motor top cover 4 passes through capacitance and drive
The circuit of dynamic circuit board 3 it is electrically connected.This just includes motor top cover to drive line 31 to provide one as the PWM of interference source
4, the common mode interference circuit of metallic conductor 32, iron core 1 and PWM driving lines 31, PWM drive the interference electric current on line 31, via
Iron core 1, metallic conductor 32, motor top cover 4 form a complete electromagnetic radiation circuit, the common mode interference circuit newly formed
Loop area greatly reduces, therefore electromagnetic radiation efficiency is very low, to effectively inhibit common mode electromagnetic radiation.
Significantly reduce the electromagnetism of brshless DC motor in above-described embodiment by way of increasing metallic conductor 32 as a result,
Radiation, and it is also very limited for the weight increase of entire brshless DC motor, and brshless DC motor overall structure is simple,
Under the premise of not using Shielding plan, electromagnetic radiation is effectively suppressed, brushless due to not using metal shell to be shielded
The production cost of direct current generator is also decreased obviously.
As long as conductivity and rigidity are met the requirements, the type of metallic conductor 32 is not unique, for example, copper, gold or other
Some rare metals etc. can be used, and engineering recommends to use copper bar in practice from the point of view of production cost.
First embodiment and second embodiment are provided in the utility model, Fig. 1 to Fig. 3 is implemented for the utility model first
The corresponding attached drawing of example；Fig. 4 and Fig. 5 is the corresponding attached drawing of the utility model second embodiment.
In the first embodiment, PWM drives line 31 to be provided in the axially extending of motor, iron core 1 for accommodating PWM
The holding tank of line 31 and inserting groove corresponding with metallic conductor 32 are driven, as shown in Figures 2 and 3, metallic conductor 32 is inserted
It will be in close contact with iron core 1 after entering into inserting groove, to realize the electrical connection between metallic conductor 32 and iron core 1.
It is understood that electric connecting mode between metallic conductor 32 and motor top cover 4 have it is a variety of, in this implementation
In example, be provided with structurally on drive circuit board 3, and with the metal clips 33 that is structurally electrically connected, in Fig. 2 and Fig. 3
It is shown, structurally formed by the copper conductor being laid on the drive circuit board 3, motor top cover 4 after mounting with metal clips
33 compress and realize the electrical connection of the two, are provided with pad hole on drive circuit board 3, metallic conductor 32 penetrates pad hole
It is interior, and realized and being electrically connected structurally by welding.
Structurally by capacitance connection between the circuit ground of drive circuit board 3, and the capacitance is preferably ceramic electrical
Hold.
In a second embodiment, the PWM drivings line 31 of both sides includes wiring section, draws section and middle part bending segment, is asked
With reference to figure 4 and Fig. 5, wiring section is used to be connected with drive circuit board 3, and axially extending along motor, and extraction section is used for and iron core
Winding is connected, and it is also axially extending along motor to draw section, and section and wiring section are drawn in bending segment connection in middle part, and towards being located at
Intermediate PWM driving lines 31 are bent.
It will be appreciated to those of skill in the art that the electromagnetic interference of BLDC motors and driver further includes DM EMI,
So-called DM EMI refers to the radiation-emitting that tri- mutual loops of line of UVW of PWM driving lines externally couple, same road
Reason, loop area is bigger, and electromagnetic radiation is stronger.
The PWM driving lines 31 of both sides are provided with middle part bending part in second embodiment, this makes two neighboring PWM drivings line
Spacing between 31 is reduced significantly, therefore the area of DM EMI loop itself being made of PWM driving lines 31 is also just significantly
It reduces, therefore electromagnetic radiation is further suppressed.
It please refers to Fig.4 and Fig. 5, middle part bending segment laterally walks line segment, second including first and laterally walk line segment and axial cabling
Section, wherein the first first end for laterally walking line segment is connected with section is drawn, and the PWM driving lines 31 of second end towards the middle extend；The
Two first ends for laterally walking line segment are connected with wiring section, and the PWM driving lines 31 of second end towards the middle extend；Axially walking line segment will
The second end that first transverse direction walks the second end of line segment and second laterally walks line segment connects.
The PWM driving lines 31 of both sides are completed according to following technique in above-described embodiment, and PWM drives line 31 from BLDC electricity
It after the iron core winding of machine is drawn, first passes through horizontal line cabling and drives line 31 close with positioned at intermediate PWM, then carry out axially walking again
Line, and then by lateral cabling or drive line 31 to separate again PWM by coil holder and distribute to connecing accordingly on drive circuit board 3
Mouth position.
In order to reduce the electromagnetic radiation of brshless DC motor as possible, line segment and intermediate PWM driving lines 31 are axially walked
The distance between be not more than 1cm, second laterally walks line segment with drive circuit board 3 at a distance from no more than 1cm.In order to further decrease
The weight of brshless DC motor entirety recommends in the utility model embodiment to use plastic shell.
Brshless DC motor it can be seen from above example disclosed in the utility model do not use filtering,
Under conditions of screen method, by the optimization to electromagnetic interference source recirculation loop, the electromagnetism of brshless DC motor is effectively inhibited
Radiation improves the Electro Magnetic Compatibility of product, and since only by increasing by a copper bar, the cabling side of line is driven to PWM
Formula optimizes and can reach said effect, therefore this kind of brshless DC motor is also at low cost, light-weight, simple in structure
Advantage is suitble to industrial production.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with it is other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new
Type.Various modifications to these embodiments will be apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest range consistent with features of novelty.
Claims (10)
1. a kind of brshless DC motor, including iron core (1), iron core winding, the drive circuit board (3) with PWM driving lines (31)
And the motor top cover (4) of metal material, which is characterized in that the PWM drives line (31) UVW with the iron core winding respectively
Three-phase input end, which corresponds to, to be connected, and is additionally provided with along the axially extending metallic conductor of motor (32), institute on the drive circuit board (3)
It states metallic conductor (32) one end to be electrically connected with the iron core (1), the other end is electrically connected with the motor top cover (4), and institute
Motor top cover (4) is stated to be electrically connected with the circuit of the drive circuit board (3) by capacitance.
2. brshless DC motor as described in claim 1, which is characterized in that the metallic conductor (32) is axially to prolong along motor
The copper bar stretched.
3. brshless DC motor as described in claim 1, which is characterized in that the PWM driving lines (31) are along the motor
It is axially extending, be provided with the holding tank for accommodating PWM driving line (31) on the iron core (1), and with the gold
Belong to the corresponding inserting groove of conductor (32), wherein the metallic conductor (32) is inserted into the inserting groove and is connect with the iron core (1)
It touches and realizes electrical connection.
4. brshless DC motor as described in claim 1, which is characterized in that be provided with structure on the drive circuit board (3)
Ground, and with the metal clips (33) being structurally electrically connected, wherein it is described structurally by the driving circuit that is laid in
Copper conductor on plate (3) is formed, and the motor top cover (4), which compresses and realizes with the metal clips (33) after assembling, electrically to be connected
It connects；The motor top cover (4) by it is described structurally and the capacitance is connect with the circuit of the drive circuit board (3).
5. brshless DC motor as claimed in claim 4, which is characterized in that the capacitance is ceramic condenser.
6. brshless DC motor as described in claim 1, which is characterized in that intermediate PWM driving lines (31) are along motor
It is axially extending, the PWM of both sides driving line (31) includes：
For being connected with the drive circuit board (3) and along the axially extending wiring section of motor；
For being connected with the iron core winding and along the axially extending extraction section of motor；
Connect the extraction section and the wiring section, and the middle part bending segment that PWM driving lines (31) towards the middle are bent.
7. brshless DC motor as claimed in claim 6, which is characterized in that the middle part bending segment includes the first lateral cabling
Section, second laterally walk line segment and axially walk line segment, wherein
Described first first end for laterally walking line segment is connected with the extraction section, and the PWM of second end towards the middle drives line
(31) extend；Described second first end for laterally walking line segment is connected with the wiring section, and the PWM of second end towards the middle drives
Moving-wire (31) extends；The axial direction walks line segment and laterally walks the second end of line segment and the second lateral cabling by described first
The second end connection of section.
8. brshless DC motor as claimed in claim 7, which is characterized in that the axial direction walks line segment and the intermediate PWM
The distance between line (31) is driven to be not more than 1cm.
9. brshless DC motor as claimed in claim 7, which is characterized in that described second laterally walks line segment and driving electricity
The distance of road plate (3) is not more than 1cm.
10. brshless DC motor as described in any one of claims 1-9, which is characterized in that the brshless DC motor
Shell (2) is plastic shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820011113.5U CN207926376U (en) | 2018-01-04 | 2018-01-04 | A kind of brshless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820011113.5U CN207926376U (en) | 2018-01-04 | 2018-01-04 | A kind of brshless DC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207926376U true CN207926376U (en) | 2018-09-28 |
Family
ID=63616035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820011113.5U Active CN207926376U (en) | 2018-01-04 | 2018-01-04 | A kind of brshless DC motor |
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| Country | Link |
|---|---|
| CN (1) | CN207926376U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022018011A1 (en) * | 2020-07-22 | 2022-01-27 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg | Electric machine |
-
2018
- 2018-01-04 CN CN201820011113.5U patent/CN207926376U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022018011A1 (en) * | 2020-07-22 | 2022-01-27 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg | Electric machine |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | "change of name, title or address" |
Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020 Patentee after: Beijing Jingwei Hengrun Technology Co., Ltd Address before: 8 / F, block B, No. 11, Anxiang Beili, Chaoyang District, Beijing 100101 Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd. |
|
| CP03 | "change of name, title or address" |