CN101686002A - Design method of high power density permanent magnet motor - Google Patents
Design method of high power density permanent magnet motor Download PDFInfo
- Publication number
- CN101686002A CN101686002A CN200810200593A CN200810200593A CN101686002A CN 101686002 A CN101686002 A CN 101686002A CN 200810200593 A CN200810200593 A CN 200810200593A CN 200810200593 A CN200810200593 A CN 200810200593A CN 101686002 A CN101686002 A CN 101686002A
- Authority
- CN
- China
- Prior art keywords
- magnet steel
- magnetic
- motor
- power density
- high power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a design method of a high power density permanent magnet motor, relating to the technical field of motors, and aiming to solve the technical problem of improving motor overloadand quick response capability. The design method of a high power density permanent magnet motor is characterized in that the load operating point of permanent magnet motor magnet steel chooses a curve segment of below the inflection point of a demagnetization curve Bm={[(-mu o NIc/8)/K mu(1-sigma)K c delta>-[(mu o hm)/K mu(1-sigma)K c delta]] Hm from magnet steel, wherein in the formula, mu o isvacuum permeability, N is armature total conductor number, Ic is integrated circuit, K mu is magnetic circuit saturation coefficient, sigma is magnetic leakage factor, Kc is Carter coefficient, deltais length of a gap between the rotor and the stator, and hm is magnet steel thickness; the coordinates of the inflection point are set to be Hmg and Bmg, the coordinates of the load operating point are Hmw and Bmw, Hmg is less than Hmw, and Bmg is more than Bmw. The invention is characterized in that the motor has high cost performance, high power density, high output, low fluctuation, small size,light weight, smooth operation and the like.
Description
Technical field
The present invention relates to motor technology, particularly relate to a kind of magneto design method of high power density permanent magnet motor of (comprising DC, brushless, permanently, permagnetic synchronous motor).
Background technology
In recent years, permanent magnetism alternating current-direct current servomotor is widely used in the automatic control system.As the driving element of quick response, constantly employ new technology and update in countries in the world.For the development that adapts to the situation, must break with the conventional idea.Best design of electrical motor principle can not satisfy the performance that reaches best, and should reach best P/C ratio, best performance/volume ratio.One of Design of PM Motor key is selected magnet steel working point, and whether reasonably the working point is to check permanent magnetic material to select for use and magnet steel size important evidence.Unloaded operation point is according to the external magnetic circuit magnetic conductance, and load operation point is according to demagnetization magnetic potential.For a long time, the magneto traditional design gets used to magnet working point (being the intersection point of magnetic flux Φ and magnetic potential F) is selected in the straight line portion of magnet steel demagnetization curve, even overload, under the dynamic magnetic circuit situation, also require the working point to drop on the above straight line portion (permanent magnetic region) of demagnetization curve flex point, thereby avoid because the armature reaction under the armature reaction, particularly transient state makes the irreversible degaussing of magnet, cause the close decline of working point magnetic, influence is exerted oneself.But the magnet steel consumption will increase, and motor cost is improved, and permanent magnetic brushless, permagnetic synchronous motor and permanent magnetic servo motor rotor inertia are increased, and reduces motor overload ability and response fast.This is the disadvantage of conventional motors design.
Summary of the invention
At the defective that exists in the above-mentioned prior art, technical problem to be solved by this invention provides a kind of direct current machine external diameter that can make and reduces, AC motor rotor inertia is reduced, overload capacity and response raising fast can make motor have the design method of high power density permanent magnet motor of high performance-price ratio, high power density, high output, characteristics such as low fluctuation, miniaturization and and even running.
In order to solve the problems of the technologies described above, a kind of design method of high power density permanent magnet motor provided by the present invention is characterized in that: the load operation point of described magneto magnet steel (being the intersection point of magnet steel magnetic flux density Bm and magnet steel magnetic field intensity Hm or magnetic flux Φ and magnetic potential F) design (selection) is in the flex point of magnet steel demagnetization curve BM=f (HM)
FollowingCurved section, promptly at magnet steel demagnetization curve Bm={[(-μ o N Ic/8)/K μ (1-σ) Kc δ]-[(μ o hm)/K μ (1-σ) Kc δ] } curved section () below the flex point of Hm, in the formula: μ o-permeability of vacuum, the total conductor number of N-armature, Ic-armature supply, K μ-magnetic circuit saturation coefficient, σ-magnetic leakage factor, the Kc-Carter, gas length between δ-rotor, hm-magnet thickness; If the coordinate of flex point is Hmg, Bmg, the coordinate of load operation point is Hmw, Bmw, Hmg＜Hmw is then arranged, Bmg＞Bmw.Improve motor cost performance and servo performance.
Further, described magneto includes brush and brushless electric machine.
Further, the magnet steel of described magneto comprises the magnet steel (brushless electric machine) of motor stator magnet steel (brush motor) and rotor portion.
Further, described load operation point is chosen in below the flex point, compensates the magnet steel degaussing by radially, axially gathering magnetic or suitably increasing the magnet steel axial length simultaneously.
The beneficial effect of design method of high power density permanent magnet motor provided by the invention:
1) armature field causes has 2～3% irreversible flux losses to allow in the magnet steel, the magneto magnet thickness of the present invention's design is kept to 7mm from 9mm, save magnet 29%, and flux loss only is 2.8%, and the power density of motor is increased substantially.Therefore, from economic point of view, irreversible among a small circle flux loss is an acceptable;
Flux loss available radial, axial poly-magnetic or suitably increase magnet steel length and compensate; The magnet thickness attenuate reduces the direct current machine external diameter, and AC motor rotor inertia is reduced, overload capacity and response raising fast;
2) suitably increase the degaussing that magnet steel length compensates armature reaction, saved one section mesopore cylinder magnet steel, only increase a slice annular magnetic steel, given full play to the magneto advantage simultaneously, made motor have characteristics such as high performance-price ratio, high output, low fluctuation, low inertia, fast-response, miniaturization and and even running.
Description of drawings
Fig. 1 is embodiment of the invention permanent magnetic brushless (a) and permanent magnet brush motor (b) cross-sectional view;
Fig. 2 influences the variation schematic diagram of lower magnetic steel demagnetization curve for different temperatures;
Fig. 3 is an embodiment of the invention permanent magnetic brushless magnet steel degaussing face schematic diagram;
Fig. 4 is embodiment of the invention Nd-Fe-B magnet steel demagnetization curve (90 ℃ time) and irreversible flux loss.
In Fig. 1 a: 11, stator yoke; 12, stator tooth; 13, stator slot; 14, rotor magnetic steel (magnetic pole); 15, rotor yoke; 16, armature spindle.In Fig. 1 b: 11 ', stator yoke; 12 ', magnetic steel of stator (magnetic pole); 13 ', rotor; 14 ', rotor tooth; 15 ', rotor yoke; 16 ', armature spindle;
In Fig. 3: 21, stator yoke; 22, stator tooth; 23, stator slot; 24, rotor magnetic steel (magnetic pole); 25, rotor yoke; 26, armature spindle; A ' is a magnet steel degaussing face.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing similarity method of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
A kind of design method of high power density permanent magnet motor that the embodiment of the invention provided, promptly the curved section below the demagnetization curve flex point is had a mind to design in the magnet steel working point.Viewpoint of the present invention: current design of electrical motor will be paid attention to the ratio of performance to price, ratio of performance and volume and power density, and the demagnetizing effect that armature reaction causes occur over just near the magnetic pole tip among a small circle in, in fact the percentage of flux loss is very little, only is 2～3%.Therefore, the flex point that is no more than demagnetization curve with pole tip place load operation point is that the magnetic Circuit Design of foundation is not only uneconomical but also motor performance is degenerated.
As shown in Figure 4, a kind of design method of high power density permanent magnet motor that the embodiment of the invention provided, magneto includes brush and brushless electric machine, design of electrical motor comprises magnet steel (brushless electric machine) design of magnetic steel of stator (brush motor) and rotor portion, it is characterized in that: the following curved section of flex point that described magneto magnet steel working point is chosen in magnet steel demagnetization curve BM=f (HM), improve motor cost performance and servo performance.One of Design of PM Motor key is selected magnet steel working point, the traditional design criterion is the straight line portion that the magnet working point is selected in the magnet steel demagnetization curve, even overload, under the dynamic magnetic circuit situation, also require the working point to drop on the above straightway of demagnetization curve flex point, thereby avoid armature reaction to make the irreversible degaussing of magnet.But must increase magnet thickness like this.The increase of magnet steel consumption improves motor cost.For permanent magnetic brushless and AC servo motor, the thickening of rotor magnetic steel increases rotor inertia, and fast-response degenerates.
Fig. 1 is embodiment of the invention non-brush permanent-magnet DC motor (a) and permanent-magnet DC brush motor (b) cross-sectional view; 1 ', 2 ', 3 ', 4 ' is magnet steel demagnetization curve under the different temperatures among Fig. 2, and Bm, Hm are magnet steel magnetic flux density and magnetic field intensity; The direction of arrow is the variations in temperature direction, and ferrite magnetic steel is the low temperature change direction, and neodymium iron boron (Nd-Fe-B) magnet steel is the high temperature change direction.Flex point 5 ' can appear in ferrite magnetic steel demagnetization curve at low temperatures, causes the irreversible degaussing of magnet steel, and flex point 5 ' can appear in Nd-Fe-B magnet steel at high temperature demagnetization curve, causes the irreversible degaussing of magnet steel, causes the working point magnetic flux density to descend the reduction of exerting oneself.
Fig. 3 is that embodiment of the invention permanent magnetic brushless cross-sectional view .A is the magnet steel degaussing face that armature reaction causes, the demagnetizing effect that visible armature reaction causes occur over just near the magnetic pole tip among a small circle in.
Fig. 4 is an example with present magneto Nd-Fe-B magnet steel commonly used, Nd-Fe-B magnet steel demagnetization curve B during 90 ℃ of expression temperature
M=f (H
M) and load operation point be in the irreversible degaussing flux loss that flex point causes below 7.For easy analysis, flex point below 7, above demagnetization curve are all represented with straightway.
The index of permanent method of the embodiment of the invention is described as follows:
Whether reasonably the working point is to check permanent magnetic material to select for use and magnet steel size important evidence.Unloaded operation point is according to the external magnetic circuit magnetic conductance, and load operation point is according to demagnetization magnetic potential.For a long time, the magneto traditional design gets used to magnet steel working point (being the intersection point of magnet steel magnetic flux density Bm and magnet steel magnetic field intensity Hm or magnetic flux Φ and magnetic potential F) is selected in the straight line portion of magnet steel demagnetization curve, even overload, under the dynamic magnetic circuit situation, also require the working point to drop on the above permanent magnetic region of demagnetization curve flex point, thereby avoid causing the close decline of working point magnetic because the armature reaction under the armature reaction, particularly transient state makes the irreversible degaussing of magnet.
1 magnet steel demagnetization curve B among Fig. 4 for the band flex point
M=f (H
M), 2,3 are respectively the zero load and the load external magnetic circuit magnetic wire of traditional design; 4 load magnetic wires for new method design of the present invention; 5,6 zero load and the load operation point that are respectively traditional design, corresponding magnetic flux density is B5, B6,6 magnetic field intensity is H6; 7 is magnet steel demagnetization curve flex point, and corresponding flex point magnetic flux density is B7; 8, the load operation point of method design of the present invention, corresponding magnetic flux density is B8; A, magnet steel (magnetic pole) degaussing face; Q/2, half magnetic pole magnetic flux distribution; A is that magnetic pole cambered surface center is the polar arc angle variable of initial point; 9 is magnetic poles flux density distribution curve B
M=f (a).Traditional design, load operation point 8 should drop between unloaded operation point 5 and the flex point 7.(torque is 0.1～40Nm) to the serial Nd-Fe-B permanent magnetic alternating current-direct current servomotor of our design, consciously the working point is selected in 8 points below the demagnetization curve flex point, thereby causes the irreversible flux loss in pole tip place (area is A).Take this design, the degaussing area of half magnetic pole section (in the Q/2 scope) is ε/(Q/2).
As shown in Figure 4: e/ (Q/2)=(B6-B7)/(B5-B7).Φ is a magnetic flux, and then irreversible flux loss relative value ΔΦ/Φ can be expressed as
ΔΦ/Φ＝(B7-B8)(B6-B7)/[4B5(B5-B7)]
Distribute and magnetic field calculation according to magnetic circuit, the magnetic flux density that can try to achieve corresponding to 5,6 and 7 is respectively
B5＝Br/[1+μr?Kμ(1-σ)Kcδ/hm]
In the formula: Br-magnet steel remanent magnetism, the average magnetic permeability of μ r-magnet steel, K μ-magnetic circuit saturation coefficient, σ-magnetic leakage factor, Kc-Carter, gas length between δ-rotor, hm-magnet thickness.
B7＝[hm?Br-μoμr?N?IC/8]/[μrK?(1-σ)Kcδ+hm]
In the formula: μ o-permeability of vacuum, the total conductor number of N-armature, I-armature supply.
B6＝Br-μo?μrH6
Calculate magnet steel operating characteristic B according to the magnetic circuit equilibrium relation
M=f (Hm) can be expressed as
Bm＝{[(-μo?N?Ic/8)/Kμ(1-σ)Kcδ]-[(μo?hm)/Kμ(1-σ)Kcδ]}Hm
If the coordinate of flex point 7 is Hmg, Bmg, the coordinate of load operation point 8 is Hmw, Bmw, then has
Hmg＜Hmw，Bmg＞Bmw。
As shown in Figure 4: successively decreasing of armature reaction demagnetizing field intensity is linear change by pole tip to pole center.During load, the edge of magnet steel one side (magnetic pole tip) has maximum degaussing, especially in starting, stop and when reversing suddenly the degaussing maximum.Take new method design, the degaussing area A in half magnetic pole Q/2 cross section scope occur over just near the magnetic pole tip among a small circle in, in fact irreversible flux loss is very little, only is 2.8%, can compensate by increasing the magnet steel axial length fully.Practice shows that magnet steel length is that 1.1～1.25 times of armature length suit, and is favourable to the increase of useful flux.Current design of electrical motor will be paid attention to P/C ratio and performance/volume ratio, and the demagnetizing effect that armature reaction causes occur over just near the magnetic pole tip among a small circle in, in fact the percentage of flux loss is very little, therefore, the flex point that is no more than demagnetization curve with pole tip place load operation point is that the magnetic Circuit Design of foundation is uneconomic.
Keep other parameter constant of Nd-Fe-B permanent magnetic servomotor, only change magnet thickness, magnet thickness is kept to 7mm from 9mm, save magnet 29%, and flux loss only is 2.8%.Therefore, from economic point of view, irreversible among a small circle flux loss is an acceptable.
Claims (4)
1, a kind of design method of high power density permanent magnet motor, it is characterized in that: the load operation point of described magneto magnet steel is chosen in magnet steel demagnetization curve Bm={[(-μ o N Ic/8)/K μ (1-σ) Kc δ]-[(μ o hm)/K μ (1-σ) Kc δ] } the following curved section of flex point of Hm, in the formula: μ o-permeability of vacuum, the total conductor number of N-armature, Ic-? K μ-magnetic circuit saturation coefficient, σ-magnetic leakage factor, Kc-Carter, gas length between δ-rotor, the hm-magnet thickness; If the coordinate of flex point is Hmg, Bmg, the coordinate of load operation point is Hmw, Bmw, and Hmg＜Hmw is then arranged, Bmg Bmw.
2, design method of high power density permanent magnet motor according to claim 1 is characterized in that, described magneto includes brush and brushless electric machine.
3, design method of high power density permanent magnet motor according to claim 1 is characterized in that, the magnet steel of described magneto comprises the magnet steel (brushless electric machine) of motor stator magnet steel (brush motor) and rotor portion.
4, design method of high power density permanent magnet motor according to claim 1 is characterized in that, described load operation point is chosen in below the flex point, compensates the magnet steel degaussing by radially, axially gathering magnetic or suitably increasing the magnet steel axial length simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810200593A CN101686002A (en) | 2008-09-27 | 2008-09-27 | Design method of high power density permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810200593A CN101686002A (en) | 2008-09-27 | 2008-09-27 | Design method of high power density permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101686002A true CN101686002A (en) | 2010-03-31 |
Family
ID=42049017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810200593A Pending CN101686002A (en) | 2008-09-27 | 2008-09-27 | Design method of high power density permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101686002A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986261A (en) * | 2014-04-10 | 2014-08-13 | 西北工业大学 | Method for improving gap flux density waveform of permanent magnet synchronous motor |
| CN108964382A (en) * | 2018-07-24 | 2018-12-07 | 山西北方机械控股有限公司 | A kind of method that permanent magnet of permanent magnet motor dosage calculates |
-
2008
- 2008-09-27 CN CN200810200593A patent/CN101686002A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986261A (en) * | 2014-04-10 | 2014-08-13 | 西北工业大学 | Method for improving gap flux density waveform of permanent magnet synchronous motor |
| CN103986261B (en) * | 2014-04-10 | 2016-06-08 | 西北工业大学 | A kind of method improving PMSM Air Gap Flux waveform |
| CN108964382A (en) * | 2018-07-24 | 2018-12-07 | 山西北方机械控股有限公司 | A kind of method that permanent magnet of permanent magnet motor dosage calculates |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103441592A (en) | Novel magnetic flux adjustable permanent magnet synchronous motor | |
| KR101826126B1 (en) | Three-phase electromagnetic motor | |
| CN105553135B (en) | Electric moto used in compressor and compressor with it | |
| CN104578659A (en) | Flux-switching type parallel hybrid permanent magnet memory motor | |
| CN102347646B (en) | General-purpose machine, there are the household electrical appliance of this motor | |
| US9780611B2 (en) | Rotary electric machine using permanent magnet | |
| Zhu et al. | Torque analysis for in-wheel switched reluctance motors with varied number of rotor poles | |
| CN105305757A (en) | Double cross hybrid excitation motor | |
| CN101958624B (en) | Motor | |
| CN104038011B (en) | Permanent-magnet synchronous reluctance motor and the compressor with it | |
| CN101686002A (en) | Design method of high power density permanent magnet motor | |
| CN203617868U (en) | Open slot straight tooth permanent magnet motor with high slot full rate and high performance | |
| CN102158033A (en) | Wide speed-regulation permanent-magnet synchronous motor | |
| WO2013158059A1 (en) | Permanent magnet electric machine | |
| CN104901456A (en) | Motor and compressor having the same | |
| CN102361385A (en) | Brushless direct current motor | |
| CN202004609U (en) | Permanent magnet synchronous motor with wide speed regulation range | |
| CN106451854A (en) | Interdigital consequent-pole permanent magnet motor | |
| CN105915007B (en) | A kind of reluctance type disc type electric machine | |
| Hsieh et al. | Cost-effective Design for high efficiency synchronous reluctance motor | |
| CN103779988A (en) | Cylindrical rotor for permanent magnet-excited electric machine | |
| CN110545060B (en) | Motor torque current optimization method and surface-mounted permanent magnet motor | |
| Bensaida et al. | On the enhancement of the starting capabilities of single phase line-start PMSMs | |
| CN201774425U (en) | Three-phase four-pole brushless DC (direct current) motor | |
| US10069358B2 (en) | Rotor of electric motor with permanent magnets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI CHUANYE ELECTRIC MACHINERY CO., LTD. NING |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 201315 NO.2502, HUNAN ROAD, KANGQIAO INDUSTRIAL PARK, KANGQIAO TOWN, NANHUIDISTRICT, SHANGHAI CITY TO: 201315 NO.2502, HUNAN ROAD, KANGQIAO INDUSTRIAL PARK, KANGQIAO TOWN, PUDONG NEW DISTRICT, SHANGHAI CITY, CHINA |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20100329 Address after: 201315, No. 2502, Shanghai South Road, Cambridge Industrial Park, Cambridge Town, Shanghai, Pudong New Area, China Applicant after: Shanghai Top Motor Co., Ltd. Applicant after: Shanghai Chuanye Electric Motor Co., Ltd. Applicant after: Ningbo Tebo Motor Co., Ltd. Address before: 201315, No. 2502, Shanghai South Road, Cambridge Industrial Park, Cambridge Town, Shanghai, Nanhui Applicant before: Shanghai Top Motor Co., Ltd. |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100331 |