CN100414815C - Magnet fastening structure for rotor in brushless DC motor - Google Patents
Magnet fastening structure for rotor in brushless DC motor Download PDFInfo
- Publication number
- CN100414815C CN100414815C CNB2003101073590A CN200310107359A CN100414815C CN 100414815 C CN100414815 C CN 100414815C CN B2003101073590 A CNB2003101073590 A CN B2003101073590A CN 200310107359 A CN200310107359 A CN 200310107359A CN 100414815 C CN100414815 C CN 100414815C
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- magnet
- rotor
- rotating shaft
- fixed part
- support portion
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Abstract
The present invention relates to a magnet fixing structure for a brushless DC motor, which comprises a rotor of which magnets are combined on the peripheral surface of a rotary shaft for transferring rotary force by that the magnets are embedded in injection molds. The present invention is characterized in that a plurality of magnet inserting surfaces are formed on the peripheral surface of the rotary shaft on which the magnets are combined, and the inserting surfaces are formed along the circumference in an axial direction in a recessed mode. Each magnet is composed of a fixing part, a plurality of supporting parts and a magnetic circuit part. The annular fixing part is fixed on the rotary shaft; the supporting parts are formed on the peripheral surface of the fixing part in a radial shape at regular intervals; the annular magnetic circuit part and the tails ends of the outsides of the supporting parts are connected together; curved surfaces are formed on the axial dividing parts of the fixing part and the supporting parts. The magnet fixing structure for a rotor of the present invention can reduce the damage frequency of the magnets due to load concentration and can prevent the magnets from being integrally damaged due to the breakage of notch parts.
Description
Technical field
The present invention relates to the rotor of brshless DC motor.
Background technology
General brushless direct-current (Blushless DC) motor includes following structure: rotor (ROTOR), ancillary coil (AMATEUR COIL), stator core (STATOR CORE) and position detecting element.Above-mentioned rotor forms magnetic field (FIELD), and moment of torsion (TORQUE) is delivered to the outside; The interaction in above-mentioned ancillary coil and magnetic field produces moment of torsion down; The said stator iron core is used to adjust above-mentioned coil, forms magnetic circuit simultaneously; Above-mentioned position detecting element is used for the position of detection rotor.
As shown in Figure 1, 2, the rotor of prior art is made of rotating shaft 1 and magnet 2.Above-mentioned rotating shaft 1 is used to transmit revolving force; Above-mentioned magnet 2 is fixed on the lower end of rotating shaft 1 by the embedding injection molding.
Above-mentioned rotating shaft 1 is made of the long metal bar with circular cross sectional shape; The Lower Half of above-mentioned rotating shaft 1 that is to say, the position of fixed magnet 2 is formed with magnet inserting surface 1a, and above-mentioned magnet inserting surface 1a forms the shape of depression or otch (D-Cut), the feasible inner peripheral surface that can insert fixed magnet 2.
As shown in Figure 3, above-mentioned magnet 2 is made of fixed part 2a, support portion 2b and the 2c of magnetic circuit portion.The fixed part 2a of ring-type is fixed on the outer peripheral face of rotating shaft 1; Above-mentioned support portion 2b is with the outer peripheral face of the tab-like one-tenth of radial maintenance one determining deviation at fixed part 2a; The above-mentioned magnetic circuit 2c of portion of ring-type and the outer ends of above-mentioned support portion 2b are connected.Wherein, the boundary position of 2a of said fixing portion and support portion 2b all forms quadrature along direction of principal axis and circumferencial direction.
Below, the assembling process of existing brushless DC motor rotor with said structure is described.
To possess the rotating shaft 1 that magnet inserting surface 1a is arranged and be inserted in the mould (not shown) that possesses effigurate die cavity (CABINET), then by the molten soup of molten soup inlet (not shown) injection magnet plastics.At this moment, as shown in Figures 2 and 3, the part of the molten soup of magnet plastics also is filled in the magnet inserting surface 1a of above-mentioned rotating shaft 1.
Then, the molten soup of magnet plastics is injected in the mould die cavity not shown in the figures, under the state that surrounds above-mentioned rotating shaft 1 outer peripheral face, makes molten soup sclerosis.
Afterwards, after peel of mould is taken out the rotating shaft 1 that is surrounded by the molten soup of magnet plastics, make the molten soup of magnet plastics form magnetic pole, then finish the assembling of rotor by magnetization.
But there is following shortcoming in the rotor with prior art brshless DC motor of said structure:
That is to say, in the rotor of prior art, though magnet 2 is inserted on the magnet inserting surface 1a of rotating shaft 1, can prevent along axial disengaging, but because magnet inserting surface 1a forms the shape of otch (D-Cut), when rotating shaft 1 high speed rotating, make the fixed part 2a of the magnet 2 that is inserted in magnet inserting surface 1a bear concentrated load, can cause fixed part 2a to produce and break.
In addition, produce when breaking, support portion 2b with fixed part 2a quadrature also is easy to generate breaks, finally cause magnet 2 integral body to be damaged at the fixed part 2a of above-mentioned magnet 2.
Summary of the invention
In order to overcome the above-mentioned shortcoming that prior art exists, the invention provides the magnet fixation structure of a kind of brshless DC motor with rotor, make when magnet embedded situation about being combined on the rotating shaft, the fixed part that also can prevent magnet breaks away from along direction of principal axis, but also can reduce concentrated load, damage preventing, the fixed part of magnet is broken, can prevent that also the support portion from breaking together.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of brshless DC motor comprises that with the magnet fixation structure of rotor magnet is combined in the rotor of the outer peripheral face of the rotating shaft that transmits revolving force by the embedding injection molding; The outer peripheral face that is combined with the rotating shaft of magnet is formed with a plurality of magnet inserting surfaces, and described a plurality of magnet inserting surfaces distribute along circumferencial direction, and are recessed to form very longways along direction of principal axis; It is characterized in that described magnet is made of fixed part, support portion and magnetic circuit portion, the fixed part of ring-type is fixed on the rotating shaft; Described a plurality of support portion with radial according to the outer peripheral face that equidistantly is formed on described fixed part; The magnetic circuit portion of ring-type and the outer ends of described support portion are connected; The direction of principal axis boundary position of described fixed part and support portion forms curved surface; Be formed with the thickened section of reinforcement at the circumferencial direction boundary position of described fixed part and support portion.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the incision stereogram of existing brushless DC motor rotor.
Fig. 2 is vertical sectional drawing of an existing rotor part.
Fig. 3 is the transverse cross of an existing rotor part.
Fig. 4 is the incision stereogram of brushless DC motor rotor of the present invention.
Fig. 5 is vertical sectional drawing of a rotor part of the present invention.
Fig. 6 is the transverse cross of a rotor part of the present invention.
Fig. 7 is vertical sectional drawing of rotor part variation of the present invention.
The number in the figure explanation:
10: rotating shaft 11: the magnet inserting surface
20: magnet 21: fixed part
21a: insert projection 21b: curved face part
21c: thickened section 22: support portion
23: magnetic circuit portion
Embodiment
As shown in Figure 4, the rotor of brshless DC motor of the present invention is made of rotating shaft 10 and magnet 20.Above-mentioned rotating shaft 10 can be rotatably set in the inside of stator (STATOR), is used to transmit revolving force; Above-mentioned magnet 20 is combined in the outer peripheral face of above-mentioned rotating shaft 10 by the embedding injection molding.
Above-mentioned rotating shaft 10 is made of the metal bar with circular cross sectional shape; Lower Half at the rotating shaft 10 that is combined with magnet 20 is formed with magnet inserting surface 11, and above-mentioned magnet inserting surface 11 forms according to certain depth is concavo-convex very longways along direction of principal axis, the feasible part that can insert above-mentioned magnet 20.
As shown in Figure 5 and Figure 6, magnet inserting surface 11 along circumferencial direction equidistantly to be unitarily formed towards direction of principal axis; According to circumstances, as shown in Figure 7, magnet inserting surface 11 also can separate formation along direction of principal axis.In these cases, magnet inserting surface 11 feasible fixed magnets 20 have more firmly been increased.
In addition, magnet inserting surface 11 hangs over rotating shaft on lathe etc. usually, rotates above-mentioned rotating shaft then and is cut into sharp very long outer peripheral face and forms.
As shown in Figure 6, magnet 20 is made of fixed part 21, support portion 22 and magnetic circuit portion 23.The said fixing portion 21 of ring-type is fixed on the outer peripheral face of above-mentioned rotating shaft 10; Above-mentioned support portion 22 is with the outer peripheral face of the tab-like one-tenth of radial maintenance one determining deviation in said fixing portion 21; The above-mentioned magnetic circuit portion 23 of ring-type and the outer ends of above-mentioned support portion 22 are connected.
Inner peripheral surface in said fixing portion 21 is formed with a plurality of insertion projection 21a, and above-mentioned a plurality of insertion projection 21a form very longways along the single ground of direction of principal axis or along the direction of principal axis piecewise, are inserted on the magnet inserting surface 11 of above-mentioned rotating shaft 10.
In addition, the direction of principal axis of said fixing portion 21 and support portion 22 boundary position forms curved face part 21b, can increase interfacial surface area; On the contrary, the circumferencial direction of said fixing portion 21 and support portion 22 boundary position forms thickened section 21c.
Below, the action effect of brushless DC motor rotor of the present invention with said structure is elaborated.
That is to say, rotating shaft 10 is placed on injection magnet plastics molten soup in back in the mould, the outer peripheral face that then makes the molten soup of magnet plastics abut against rotating shaft 10 forms fixed part 21, form the support portion 22 and magnetic circuit portion 23 that links above-mentioned support portion 22 and the sclerosis that prolong from said fixing portion 21 simultaneously, finish the making of brushless DC motor rotor.
Wherein, the outer peripheral face part of above-mentioned rotating shaft 10, more precisely, possessing at the outer peripheral face with fixed part 21 contacts site of magnet 20 has a plurality of magnet inserting surfaces 11 that are recessed to form along circumferencial direction, make the molten soup of magnet plastics be injected into above-mentioned magnet inserting surface 11 and sclerosis, above-mentioned magnet 20 is combined on the rotating shaft 10 with concaveconvex shape.
So, make that fixed part 21 inner peripheral surfaces at magnet 20 form a plurality of insertion projection 21a, the axial section of above-mentioned insertion projection 21a is combined closely on the direction of principal axis section of magnet inserting surface 11, improved the direction of principal axis bed knife of magnet 20.
In addition, because a plurality of insertion projection 21a are formed on the inner peripheral surface of the fixed part 21 of magnet 20 along the inner peripheral surface of fixed part 21, when high speed rotating, can bear loading equably.So, can prevent in advance because the magnet 20 that concentrated load causes is damaged.
In addition, owing to make the boundary position of fixed part 21 and support portion 22 form the curved face part of chamfering, have thickened section 21c simultaneously, can enlarge whole cross-sectional area, rigidity that particularly can reinforcement recess (NOTCH) position can prevent effectively that magnet integral body is damaged.
The effect of invention
Brshless DC motor provided by the invention can bring following effect with the magnet fixation structure of rotor.
At brshless DC motor of the present invention with in the magnet fixation structure of rotor, owing to be combined with magnet The outer peripheral face of rotating shaft is formed with a plurality of magnet inserting surfaces, and make the recess position of magnet form chamfering or Form thickened section, thus not only can reduce the concentrated load that magnet is born, can prevent damaged, and And can also prevent that the magnet integral body that causes owing to breaking of recess position is damaged. Thereby can improve electricity The reliability of machine.
Claims (1)
1. the magnet fixation structure of a brshless DC motor usefulness rotor comprises that magnet is combined in the rotor of the outer peripheral face of the rotating shaft that transmits revolving force by the embedding injection molding; The outer peripheral face that is combined with the rotating shaft of magnet is formed with a plurality of magnet inserting surfaces, and described a plurality of magnet inserting surfaces distribute along circumferencial direction, and are recessed to form very longways along direction of principal axis; It is characterized in that,
Described magnet is made of fixed part, support portion and magnetic circuit portion, and the fixed part of ring-type is fixed on the rotating shaft; Described a plurality of support portion with radial according to the outer peripheral face that equidistantly is formed on described fixed part; The magnetic circuit portion of ring-type and the outer ends of described support portion are connected; The direction of principal axis boundary position of described fixed part and support portion forms curved surface;
Be formed with the thickened section of reinforcement at the circumferencial direction boundary position of described fixed part and support portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101073590A CN100414815C (en) | 2003-12-12 | 2003-12-12 | Magnet fastening structure for rotor in brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101073590A CN100414815C (en) | 2003-12-12 | 2003-12-12 | Magnet fastening structure for rotor in brushless DC motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1627601A CN1627601A (en) | 2005-06-15 |
| CN100414815C true CN100414815C (en) | 2008-08-27 |
Family
ID=34758163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101073590A Expired - Fee Related CN100414815C (en) | 2003-12-12 | 2003-12-12 | Magnet fastening structure for rotor in brushless DC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100414815C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487137B (en) * | 2015-08-26 | 2020-02-14 | 日立金属株式会社 | Surface magnet type rotary member |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3615230A1 (en) * | 1986-05-06 | 1987-11-12 | Krups Stiftung | Method for producing armatures for electric motors, and armatures produced in accordance with this method |
| US5158390A (en) * | 1987-04-21 | 1992-10-27 | Diesel Kiki Co., Ltd. | Jointing structure of rotor and shaft |
| EP0726637A2 (en) * | 1995-02-11 | 1996-08-14 | ABB Management AG | Electrical machine with a shaft having tooth-like projections |
| CN1189712A (en) * | 1997-01-27 | 1998-08-05 | 希尔蒂股份公司 | Electric motor |
| JP2001178043A (en) * | 1999-12-20 | 2001-06-29 | Fujitsu General Ltd | Rotor of direct-current brushless motor |
-
2003
- 2003-12-12 CN CNB2003101073590A patent/CN100414815C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3615230A1 (en) * | 1986-05-06 | 1987-11-12 | Krups Stiftung | Method for producing armatures for electric motors, and armatures produced in accordance with this method |
| US5158390A (en) * | 1987-04-21 | 1992-10-27 | Diesel Kiki Co., Ltd. | Jointing structure of rotor and shaft |
| EP0726637A2 (en) * | 1995-02-11 | 1996-08-14 | ABB Management AG | Electrical machine with a shaft having tooth-like projections |
| CN1189712A (en) * | 1997-01-27 | 1998-08-05 | 希尔蒂股份公司 | Electric motor |
| JP2001178043A (en) * | 1999-12-20 | 2001-06-29 | Fujitsu General Ltd | Rotor of direct-current brushless motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1627601A (en) | 2005-06-15 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080827 Termination date: 20100112 |