CN106208555A - A kind of extended method of built-in brshless DC motor pole embrace - Google Patents
A kind of extended method of built-in brshless DC motor pole embrace Download PDFInfo
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- CN106208555A CN106208555A CN201610811230.5A CN201610811230A CN106208555A CN 106208555 A CN106208555 A CN 106208555A CN 201610811230 A CN201610811230 A CN 201610811230A CN 106208555 A CN106208555 A CN 106208555A
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- permanent magnet
- brshless
- angle
- motor
- extension
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dc Machiner (AREA)
Abstract
The invention provides the extended method of a kind of built-in brshless DC motor pole embrace, first, according to the demagnetized field Strength co-mputation permanent magnet minimum edge thickness at flex point k under extremely maximum demagnetization magnetic potential every during built-in brshless DC motor nominal operation and high temperature；Then, utilize AutoCAD to redesign permanent magnet shape and size according to minimum edge thickness, and measure the angle between permanent magnet edge；Finally, according to the extension pole embrace of the angle calculation brshless DC motor corresponding with pole span of the angle between permanent magnet edge.The inventive method makes full use of the structure of permanent magnet trough, by extension permanent magnet edge, strengthens permanent magnet width so that pole embrace is expanded, has both avoided the generation of wedge angle demagnetization, it also avoid in pole embrace expansion process and cause permanent magnet to waste.After utilizing the inventive method to carry out pole embrace extension, air gap flux density is more nearly square wave, controls to reduce motor torque ripple, vibration and noise by square wave.
Description
Technical field
The invention belongs to technical field of motors, particularly relate to the extension side of a kind of built-in brshless DC motor pole embrace
Method.
Background technology
Rare-earth permanent-magnet electric machine has simple in construction, easy to maintenance, stable, dependable performance, power density high and speed governing
The advantages such as performance is good, have achieved extensively application in wind power generation field, electric automobile field and Digit Control Machine Tool field；With
Time, the research for magneto body design with optimization also gets more and more, and research contents mainly includes that motor new structure sets
Meter and optimize the parameter of electric machine to reduce torque pulsation, to improve power factor, obtain the target of reasonable air gap flux density, wherein,
Pole embrace is the key parameter of design of electrical motor, directly affects air gap magnetic density waveform, and when pole embrace increases, air gap flux density divides
Cloth can be gradually become square wave by sine wave, and winding back emf square wave feature can be the best, and torque pulsation can reduce, and motor runs and also gets over
Steadily, also can improve motor electromagnetic vibration and noise, therefore, in brshless DC motor designs, it is desirable to pole embrace is more simultaneously
Big the best.Built-in brshless DC motor is a kind of special construction of brshless DC motor, and magnet steel is embedded in internal rotor, has
Higher reliability, in built-in brshless DC motor designs, needs to consider motor volume and power density, polar arc system
The value of number can be limited by rotor size, if pursuing big pole embrace the most simply, can cause rotor
Diminish every magnetic bridge part so that brshless DC motor leakage field increases.
For reducing leakage field, the two ends of built-in brshless DC motor permanent magnet trough can use three-legged structure, i.e. permanent magnet trough
Wedge angle, in being typically designed, permanent magnet trough wedge angle position will not embed permanent magnet.When designed high power density is built-in brushless
When direct current generator pole embrace is smaller, it is possible to use pole embrace is extended by permanent magnet trough wedge angle, method is at groove point
Angle Position also fills the permanent magnet width with increasing permanent magnet, but faces a problem in this expansion process: permanent magnet trough
Wedge angle is the thinnest closer to marginal position, owing to the permanent magnet filled to groove wedge angle position is consistent with groove angular shape, when permanent magnetism
When body is embedded into groove wedge angle position or is fully filled with groove, permanent magnet edge is the least along magnetizing direction thickness, along with motor work temperature
Degree raises, and permanent magnet demagnetizing curve bends, and armature field can cause permanent magnet marginal position to produce irreversible demagnetization, and this phenomenon claims
Demagnetizing for wedge angle, wedge angle demagnetization can cause the permanent magnet close to marginal position to lose efficacy, the width strengthening permanent magnet simply, especially
When being to be filled up by groove wedge angle, permanent magnet can be caused because of partial failure to produce waste.Therefore, the extension of pole embrace can be by point
The restriction of angle demagnetization.Built-in high power density brshless DC motor volume is little, and the arrangement space of permanent magnet is restricted, design
During pole embrace take less than ideal value, need to seek one and can avoid built-in brshless DC motor permanent magnet that point occurs
The pole embrace extended method of angle demagnetization.
Summary of the invention
Solve the technical problem that
For lacking of big pole embrace cannot be obtained during making up brshless DC motor big in design power, that volume is little
Fall into, improve square wave and control the performance of brshless DC motor, and avoid the demagnetization of permanent magnet generation wedge angle to cause waste, the present invention to carry
Go out the extended method of a kind of built-in brshless DC motor pole embrace considering wedge angle demagnetization impact.
Technical scheme
The extended method of a kind of built-in brshless DC motor pole embrace, it is characterised in that step is as follows:
Step 1: according to h1=Fadm/HkCalculate permanent magnet minimum edge thickness h1, wherein, FadmFor built-in brushless direct-current
Every extremely maximum demagnetization magnetic potential, H during Rated motor workkFor the demagnetization magnetic at flex point k on permanent magnet material demagnetizing curve during temperature T
Field intensity, wherein, T >=150 DEG C；FadmComputing formula beWherein, IaFor rated operational current,
WΦFor every phase winding turns-in-series, KWFor winding coefficient, p is number of pole-pairs；
Step 2: the permanent magnet edge thickness after order extension is h1, according to permanent magnet edge keeping parallelism former before and after extension
Then, utilize AutoCAD to draw permanent magnet shape after extension, and mark magnet size, measure permanent magnet after being expanded simultaneously
Angle α between edge1, described permanent magnet edge angle be upper end, two edges of permanent magnet, every pole respectively with intersection point A, A of groove '
And the angle of line between rotor axis O；
Step 3: according to αpmax=α1/ β is the pole embrace α of built-in brshless DC motor after being calculated extensionpmax, then
The spreading range of pole embrace is (α/β, αpmax]；Wherein, β is the angle that pole span is corresponding, and α is between the front permanent magnet edge of extension
Angle.
Beneficial effect
The extended method of a kind of built-in brshless DC motor pole embrace that the present invention proposes, makes full use of permanent magnet trough
Structure, by extension permanent magnet edge, strengthen permanent magnet width so that pole embrace is expanded；Utilize Rated motor work
When making, the ratio of demagnetized field intensity at the most maximum every demagnetization magnetic potential and flex point k determines permanent magnet minimum edge thickness, both keeps away
Exempt from the generation of wedge angle demagnetization, it also avoid in pole embrace expansion process and cause permanent magnet to waste.The inventive method is utilized to enter
Row pole embrace extension after, air gap flux density is more nearly square wave, by square wave control can reduce motor torque ripple, vibration and
Noise.
Accompanying drawing explanation
Fig. 1 is the calculation flow chart of a kind of built-in brshless DC motor pole embrace extended method of the present invention.
Fig. 2 is neodymium iron boron 35SH demagnetizing curve when 150 DEG C.
Fig. 3 is rotor schematic diagram before and after the extension of built-in brshless DC motor pole embrace.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings, and the present invention includes but are not limited to following enforcement
Example.
Owing to built-in brshless DC motor pole embrace size is relevant with the spatial distribution of permanent magnet on rotor, permanent magnet
Width is the widest, and motor pole embrace is the biggest.If groove pointed part filling permanent magnet can be extended the width of permanent magnet, polar arc system
Number strengthens therewith so that brshless DC motor air gap flux density is more nearly square wave, and square wave controls this brshless DC motor torque arteries and veins
Dynamic and noise can reduce.But, when motor operating temperature is higher than certain value, after the demagnetized field that winding produces exceedes certain value,
Permanent magnet demagnetizing curve can drastically decline, and new recovery curve no longer overlaps with demagnetizing curve, produces irreversible demagnetization, after demagnetization
The magnetic that is provided out of permanent magnet close strongly reduce, repeated work even results in the complete loss of excitation of permanent magnet, thus permanent magnet to
Need to check minimum thickness during the extension of groove wedge angle, it is to avoid wedge angle demagnetization occurs, is possible to prevent permanent magnet to waste simultaneously.
Based on above-mentioned thought, as it is shown in figure 1, the magneto pole embrace extension considering wedge angle demagnetization impact of the present invention
Method detailed process is as follows:
1) demagnetized field intensity H at permanent magnet demagnetizing curve flex point k is determinedk
Wedge angle demagnetization occurs under the high temperature conditions, and the high power density magneto internal temperature worked long hours is 100
More than DEG C, the present embodiment motor operating temperature is about 150 DEG C, selects the magnetic field at 150 DEG C of neodymium iron boron 35SH demagnetizing curve flex points k
The permanent magnet minimum edge thickness that intensity calculates, as in figure 2 it is shown, demagnetized field intensity size is H at flex point kk=
487000A/m；
2) every extremely maximum demagnetization magnetic potential F during brshless DC motor nominal operation is determinedadm
When motor is in rated operation for a long time, temperature raises, the demagnetized field meeting that machine winding current produces afterwards
Cause permanent magnet generation irreversible demagnetization, so, the minimum thickness of permanent magnet to be estimated needs first to determine that Rated motor works
Time the most maximum every demagnetization magnetic potential, computing formula isWherein, IaFor rated operational current, WΦFor often
Phase winding turns-in-series, KWFor winding coefficient, p is number of pole-pairs.The built-in brushless DC motor rotor schematic diagram of the present embodiment
As it is shown on figure 3, its rated current Ia=50A, every phase winding turns-in-series WΦ=42, winding coefficient KW=0.96, number of pole-pairs p=
3, then can be calculated every extremely maximum demagnetization magnetic potential is Fadm=581.9A.
3) permanent magnet minimum edge thickness h is calculatedmin
Take advantage of magnetic field intensity can obtain permanent magnet minimum edge thickness equal to every extremely maximum demagnetization magnetic potential according to magnetic potential equal to distance
FadmDivided by magnetic field intensity Hk, computing formula is hmin=Fadm/Hk, the present embodiment minimum thickness is hmin=1.19mm.
4) permanent magnet is redesigned
The shape of permanent magnet trough and size are by prefetching pole embrace αpDetermine with every magnetic bridge width c, as it is shown on figure 3, this reality
Executing middle permanent magnet edge vertices to overlap with A point, permanent magnet shape is consistent with permanent magnet trough, and groove edge position forms groove wedge angle, should
Position some do not have permanent magnet to fill.Wherein, αp=α/β, α is the angle between permanent magnet edge, i.e. every pole permanent magnet two
Upper end, individual edge respectively and intersection point A, A of groove ' and rotor axis O between the angle of line, β is the angle that pole span is corresponding, this reality
Execute and example prefetches pole embrace αpIt is 0.83, angle α=50 ° between permanent magnet edge, angle beta=60 ° that pole span is corresponding.
For the generation avoiding wedge angle to demagnetize, with permanent magnet minimum edge thickness hminThe boundary condition widened for permanent magnet, i.e.
The edge thickness h of permanent magnet after order extension1=hmin, rely on permanent magnet trench structure, utilize AutoCAD directly in groove wedge angle
Drawing permanent magnet edge, according to the principle of permanent magnet edge keeping parallelism before and after extension, permanent magnet edge still hangs down with groove edge AB
Directly, i.e. h1//h, as it is shown on figure 3, the new permanent magnet obtained after Kuo Zhan be former permanent magnet and permanent magnet expansion and, this mistake
The profile of journey permanent magnet there occurs change, utilizes AutoCAD can directly measure permanent magnet each several part size, and is labeled.
After the extension of permanent magnet width, the angle between permanent magnet edge becomes big, can be obtained by AutoCAD measurement: new permanent magnetism
Body upper end-face edge produces new intersection point C with groove1、C2, make boost line from rotor axis O to these 2, measure and press from both sides between two lines section
Angle, i.e. angle α between permanent magnet edge after extension1=55.8 °.
5) the pole embrace α of built-in brshless DC motor after calculating extensionpmax
By αpmax=α1Pole embrace α after/β extensionpmax, the pole embrace after the present embodiment extension is αpmax=0.93,
Can be seen that relatively prefetching pole embrace increases a lot.It should be understood that αpmaxIt is to be avoided that the maximum polar arc system that wedge angle demagnetizes
Number, takes (α/β, α during optimizationpmaxBetween], any value can avoid wedge angle demagnetization phenomenon to occur.
Claims (1)
1. the extended method of a built-in brshless DC motor pole embrace, it is characterised in that step is as follows:
Step 1: according to h1=Fadm/HkCalculate permanent magnet minimum edge thickness h1, wherein, FadmFor built-in brshless DC motor
Every extremely maximum demagnetization magnetic potential, H during nominal operationkStrong for the demagnetized field at flex point k on permanent magnet material demagnetizing curve during temperature T
Degree, wherein, T >=150 DEG C；FadmComputing formula beWherein, IaFor rated operational current, WΦFor
Every phase winding turns-in-series, KWFor winding coefficient, p is number of pole-pairs；
Step 2: the permanent magnet edge thickness after order extension is h1, according to the principle of permanent magnet edge keeping parallelism before and after extension, profit
Draw permanent magnet shape after extension with AutoCAD, and mark magnet size, measure after being expanded between permanent magnet edge simultaneously
Angle α1, described permanent magnet edge angle be upper end, two edges of permanent magnet, every pole respectively with intersection point A, A of groove ' and rotor
The angle of line between the O of axle center；
Step 3: according to αpmax=α1/ β is the pole embrace α of built-in brshless DC motor after being calculated extensionpmax, then polar arc
The spreading range of coefficient is (α/β, αpmax]；Wherein, β is the angle that pole span is corresponding, and α is the folder between the front permanent magnet edge of extension
Angle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610811230.5A CN106208555B (en) | 2016-09-09 | 2016-09-09 | A kind of extended method of built-in brshless DC motor pole embrace |
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| CN201610811230.5A CN106208555B (en) | 2016-09-09 | 2016-09-09 | A kind of extended method of built-in brshless DC motor pole embrace |
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| CN106208555A true CN106208555A (en) | 2016-12-07 |
| CN106208555B CN106208555B (en) | 2018-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276355A (en) * | 2017-07-27 | 2017-10-20 | 西安思坦科技有限公司 | A kind of permanent magnet low-speed directly drives synchronous motor |
| CN114047441A (en) * | 2021-11-09 | 2022-02-15 | 常州隆耐电驱动技术有限公司 | Integrated drive control system and method for permanent magnet synchronous motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5698921A (en) * | 1995-09-22 | 1997-12-16 | Mitsubishi Denki Kabushiki Kaisha | Permanent magnet type motor |
| CN104158458A (en) * | 2014-07-24 | 2014-11-19 | 天津大学 | Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure |
-
2016
- 2016-09-09 CN CN201610811230.5A patent/CN106208555B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5698921A (en) * | 1995-09-22 | 1997-12-16 | Mitsubishi Denki Kabushiki Kaisha | Permanent magnet type motor |
| CN104158458A (en) * | 2014-07-24 | 2014-11-19 | 天津大学 | Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276355A (en) * | 2017-07-27 | 2017-10-20 | 西安思坦科技有限公司 | A kind of permanent magnet low-speed directly drives synchronous motor |
| CN114047441A (en) * | 2021-11-09 | 2022-02-15 | 常州隆耐电驱动技术有限公司 | Integrated drive control system and method for permanent magnet synchronous motor |
| CN114047441B (en) * | 2021-11-09 | 2024-04-30 | 常州隆耐智能装备有限公司 | Permanent magnet synchronous motor integrated driving control system and method |
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| CN106208555B (en) | 2018-08-07 |
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