CN101938173B - Rotor of brushless motor - Google Patents
Rotor of brushless motor Download PDFInfo
- Publication number
- CN101938173B CN101938173B CN201010202723.1A CN201010202723A CN101938173B CN 101938173 B CN101938173 B CN 101938173B CN 201010202723 A CN201010202723 A CN 201010202723A CN 101938173 B CN101938173 B CN 101938173B
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- CN
- China
- Prior art keywords
- mentioned
- rotor
- magnet
- electric machine
- rotating shaft
- 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.)
- Expired - Fee Related
Links
- 239000000088 plastic resin Substances 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000012212 insulator Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 description 9
- 239000000806 elastomer Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The present invention provides a rotor of a brushless motor. The existing rotor has problems of weak strength of material, oscillation and noises due to rotation. The rotor of the invention is composed of rotating magnets formed by resin that elastic bodies are mixed in plastic resin magnets. When the rotating magnet is formed by mixing the elastic body into the plastic resin magnet, a rotor core is integrally embedded to form. The rotor core is of a shape that projections are uniformly formed in a direction intersecting with an axial cord, and the number of the projections is a prime number more than five.
Description
Technical field
The present invention relates to a kind of rotor for brushless motor being formed by plastic resin magnet.
Background technology
At present, as the normal plastic resin magnet that magnetic is mixed into plastic resin that uses such as the rotary magnet 10 for brushless electric machine etc., in addition, known following rotor for brushless motor, it is characterized in that, also the elastic resins such as elastomer are mixed in this plastic resin magnet and by this resin and form rotary magnet (with reference to patent documentation 1).
Structure as other in patent documentation 1 has also been recorded, the periphery of the rotor core cylindraceous of stacked electromagnetic steel plate with plastic resin magnet cylindric the rotor for brushless motor of the structure that is integrally formed.
If the rotor for brushless motor that said structure is such is higher than the structural viscosity being shaped with the magnet that is only mixed with plastics resin, therefore can reduce the damaged of rotary magnet after shaping.
[patent documentation 1] TOHKEMY 2004-282910 communique
Summary of the invention
Because above-mentioned existing rotary magnet is mixed with the elastic force elastomer that intensity is low than plastic resin is high, therefore power when resistance to rotor not, produces vibration, noise, or brings impact to rotation stably.Especially in the purposes that needs the purposes of High Rotation Speed, the large torque of needs, impact is remarkable.
In addition, in the manufacture method of such rotary magnet, fill up injection molding forming with in mould with aqueous plastic resin magnet, and magnetize with the magnet that is arranged at mould.The plastic resin magnet of this mixed elastomer also contains the raw-material magnetic iron powder as magnet except plastic resin, elastomer.Therefore, if magnetized by above-mentioned mould internal magnet, above-mentioned magnetic iron powder relies on magnet side, builds up iron constituents and builds up plastic resin or elastomer in opposition side in magnet side, after being shaped, produces biasing.
The biasing of such magnetic iron powder produces following problem, and the outside of rotary magnet is firm and inner side becomes the weak part of strength ratio that elastomer is many, produces by the uneven caused vibration of magnetic.Especially than only forming with plastics resin, because adding elastomer to die down in intensity, therefore such problem becomes more remarkable.
The present invention is directed to and use the plastic magnet of mixed elastomer and the method for shaping rotary magnet, pin provides the method for solution in above-mentioned existing problem.
The first technical scheme of the present invention is a kind of rotor for brushless motor, it is characterized in that, this rotor for brushless motor is made up of rotor magnet, this rotor magnet is integrally formed by plastic resin magnet at rotating shaft, above-mentioned plastic resin magnet is mixed with elastomer, be embedded with the rotor core of steel plate stacked at above-mentioned rotating shaft, covered completely and be integrally formed by above-mentioned magnetic material.
The second technical scheme of the present invention is the rotor for brushless motor of recording according to the first technical scheme, it is characterized in that, above-mentioned rotor core is to evenly form projection with the direction of Axis Cross (wait and join).
The 3rd technical scheme of the present invention is the rotor for brushless motor of recording according to the second technical scheme, it is characterized in that, the projection of above-mentioned rotor core is the uniform distribution of more than 5 prime numbers.
Rotor for brushless motor of the present invention, can be mixed with elastomeric plastic resin magnet by use, damaged few goods after shaping are provided, can reduce in addition by use be mixed with the direction of rotation of the caused rotor core of elastomeric plastic resin magnet and resin undercapacity, reduce the generation by the uneven caused vibration of magnetic.
Brief description of the drawings
Fig. 1 is the cutaway view of motor of the present invention.
Fig. 2 is the cutaway view along the A-B in Fig. 3 of rotor of the present invention.
Fig. 3 is the outlet side vertical view of rotor of the present invention.
Fig. 4 is the correlation table of number of poles of the present invention, slit number, bump count.
The explanation of Reference numeral
1 motor
2 stators
3 stator cores
4 insulators
5 windings
6 circuit substrates
7 motor racks
8 rotors
9 rotating shafts
10 rotary magnets
11 bearings
12 bearing brackets
13 rotor cores
14 base portions
15 projections
16 holes
Embodiment
Describe with reference to 1～4 pair of embodiments of the invention of figure.
The motor of the present invention 1 of recording in Fig. 1 is DC brushless motor.Stator 2 provides insulator 4, package winding 5 on this insulator 4 in the stator core 3 of stacked annular steel plate.Possess the circuit substrate 6 for making the drive circuit that motor 1 of the present invention drives, be arranged on stator 2 with the installation pin etc. that is arranged at above-mentioned insulator 4.Stator 2 and circuit substrate 6 are molded resin and cover, and are integrally formed with motor rack 7.
In the rotor 8 configuring in interior week of above-mentioned motor rack 7, rotating shaft 9 and rotary magnet described later 10 form.In the front and back of rotating shaft 9, bearing 11 is installed.Be installed on the chimeric side's of bearing bracket 12a the bearing 11a of above-mentioned motor rack 7, the opposing party's bearing 11b is fitted to bearing bracket 12b, and rotor 8 is supported by axle in both sides accordingly.Outlet side at rotating shaft 9 is provided with fan etc.
According to Fig. 2, rotor 8 of the present invention is described.Rotor 8 of the present invention has been embedded with the rotor core 13 of steel plate stacked on rotating shaft 9, form, thereby rotary magnet 10 becomes one with rotor core 13 with being mixed with elastomeric plastic resin magnet.
In the manufacture method of rotor 8 of the present invention, rotor core 13 is embedded in to rotating shaft 9 and is accommodated in injection mould molding mould tool, make the elastomeric plastic resin magnet that is mixed with softening flow into mould, thereby be integrally formed.The rotary magnet 10 forming is formed uniformly by magnetization.
According to Fig. 3, be embedded in rotating shaft 9 above-mentioned rotor core 13 be shaped as the base portion 14 of concentric circles outward direction be formed uniformly multiple projections 15.In addition, between each projection 15 and base portion 14, hole 16 is set, in the time being shaped, making to be mixed with elastomeric plastic resin magnet and enter in hole 16, thereby make rotor core 13 and rotary magnet 10 further fixing, in addition with respect to the also grow of tolerance of the stacked skew of rotor core 13.
Like this by forming with rotor core 13 with being mixed with the rotary magnet 10 that elastomeric plastic resin magnet forms, can to originally with respect to the power being produced by rotation weak carry out intensity correction, eliminate the problems such as rotor oscillation.
As shown in Figure 4, according to the relation of the slit number of the number of poles of rotor and stator, the quantity of projection 15 of the present invention is to exceed 4 prime number.
The quantity of projection is set scope as shown in Figure 4 for, and the natural frequency of selection to step mode etc. do not have dysgenic scope.Due to the impact of step mode, the intrinsic vibration of having to projection 15 brings impact, has the possibility that causes resonance.Therefore, owing to considering the impact being produced by N, two magnetic poles of S in 2 multiple, in 3 multiple, by 3 120 ° of impacts that energising produces mutually, be, therefore to exceed 4 prime number.
Rotor for electromotor of the present invention has the effect of low noise, low vibration, effective to whole brushless electric machine, if be especially used in to low noise requirement high, the air-conditioning, air cleaner, dehumidifier, humidifier etc. that use in the family, effective especially.
Claims (5)
1. a brushless electric machine, is characterized in that, this brushless electric machine has stator, rotor and motor rack;
Said stator has stator core, insulator and winding, and said stator iron core is provided with insulator, package winding on above-mentioned insulator;
Above-mentioned rotor has rotating shaft, rotor core and rotor magnet, and above-mentioned rotating shaft is provided with bearing, above-mentioned rotor core be stacked steel plate and form and be arranged on above-mentioned rotating shaft; Above-mentioned rotor magnet is to be mixed with elastomeric plastic resin magnet, covers above-mentioned rotor core one and is installed on rotating shaft;
Above-mentioned motor rack configures above-mentioned rotor in interior week,
Above-mentioned rotor magnet is formed following shape: is set as heavy section near the outer circumferential side of above-mentioned motor rack with near the inner circumferential side of above-mentioned rotating shaft, between described heavy section, connects by thinner wall section,
Above-mentioned rotor core has the base portion of concentric circles, multiple projection and hole,
Above-mentioned projection arranges to the direction of intersecting with rotating shaft direction equably from above-mentioned base portion,
In the size range that the radial position of above-mentioned hole in rotor core radially extended along rotor magnet in above-mentioned thinner wall section,
Above-mentioned plastic resin magnet enters in above-mentioned hole.
2. brushless electric machine according to claim 1, is characterized in that, the projection of above-mentioned rotor core is the uniform distribution of more than 5 prime numbers.
3. brushless electric machine according to claim 1, is characterized in that, above-mentioned hole is arranged between above-mentioned each projection and above-mentioned base portion.
4. brushless electric machine according to claim 1, is characterized in that, above-mentioned brushless electric machine is driven by 120 ° of energisings of 3 phase.
5. according to the brushless electric machine described in any one in claim 1 to 4, it is characterized in that,
Described motor rack is integrally formed by covering said stator by moulded resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-154471 | 2009-06-30 | ||
| JP2009154471A JP5691141B2 (en) | 2009-06-30 | 2009-06-30 | Rotor for brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101938173A CN101938173A (en) | 2011-01-05 |
| CN101938173B true CN101938173B (en) | 2014-10-22 |
Family
ID=43391351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010202723.1A Expired - Fee Related CN101938173B (en) | 2009-06-30 | 2010-06-10 | Rotor of brushless motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5691141B2 (en) |
| CN (1) | CN101938173B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5600610B2 (en) * | 2011-01-18 | 2014-10-01 | 三菱電機株式会社 | Motor rotor, mold motor, air conditioner, and mold motor manufacturing method |
| CN106160279A (en) * | 2016-08-19 | 2016-11-23 | 湖州南洋电机有限公司 | A kind of V-groove rotor element of band ball bearing |
| JP7400596B2 (en) * | 2020-03-31 | 2023-12-19 | 株式会社富士通ゼネラル | permanent magnet electric motor |
| CN114665629A (en) * | 2022-04-20 | 2022-06-24 | 成都银河磁体股份有限公司 | Magnet structure, magnetic rotor and motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311556A (en) * | 2000-02-28 | 2001-09-05 | 东芝株式会社 | Electric motor for electric fan |
| CN1671029A (en) * | 2004-03-19 | 2005-09-21 | 日本电产芝浦株式会社 | Brushless DC motor |
| CN101127461A (en) * | 2007-07-13 | 2008-02-20 | 南京航空航天大学 | Hybrid Excitation Doubly Salient Brushless DC Generator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH062976U (en) * | 1992-05-30 | 1994-01-14 | 愛知電機株式会社 | Plastic magnet rotor |
| JP2001347537A (en) * | 2000-06-08 | 2001-12-18 | Canon Inc | Insert component, its molding method, and plastic molding |
| JP2004282910A (en) * | 2003-03-17 | 2004-10-07 | Matsushita Electric Ind Co Ltd | Brushless motor rotor |
| KR20090040730A (en) * | 2007-10-22 | 2009-04-27 | 삼성전자주식회사 | Manufacturing apparatus of rotor for brushless motor and manufacturing method of rotor using same |
| JP5231790B2 (en) * | 2007-11-20 | 2013-07-10 | 日本電産テクノモータ株式会社 | Motor rotor and motor |
-
2009
- 2009-06-30 JP JP2009154471A patent/JP5691141B2/en not_active Expired - Fee Related
-
2010
- 2010-06-10 CN CN201010202723.1A patent/CN101938173B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311556A (en) * | 2000-02-28 | 2001-09-05 | 东芝株式会社 | Electric motor for electric fan |
| CN1671029A (en) * | 2004-03-19 | 2005-09-21 | 日本电产芝浦株式会社 | Brushless DC motor |
| CN101127461A (en) * | 2007-07-13 | 2008-02-20 | 南京航空航天大学 | Hybrid Excitation Doubly Salient Brushless DC Generator |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2004-282910A 2004.10.07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011015453A (en) | 2011-01-20 |
| CN101938173A (en) | 2011-01-05 |
| JP5691141B2 (en) | 2015-04-01 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: NIDEC TECHNO MOTOR CORPORATION Free format text: FORMER OWNER: NIDEC TECHNO MOTOR HOLDINGS CORPORATION Effective date: 20130924 Owner name: NIDEC TECHNO MOTOR HOLDINGS CORPORATION Free format text: FORMER OWNER: NIPPON ELECTRONICS SHIBAURA CO., LTD. Effective date: 20130924 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130924 Address after: Kyoto Japan Applicant after: NIDEC TECHNO MOTOR Corp. Address before: Kyoto Japan Applicant before: Nidec Techno Motor Holdings Corp. Effective date of registration: 20130924 Address after: Kyoto Japan Applicant after: Nidec Techno Motor Holdings Corp. Address before: Fukui Prefecture of Japan Applicant before: Nidec Shibaura Corp. |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141022 Termination date: 20190610 |