CN100409541C - Brushless dc electric machine and special stater iron core thereof - Google Patents
Brushless dc electric machine and special stater iron core thereof Download PDFInfo
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- CN100409541C CN100409541C CNB2005100604765A CN200510060476A CN100409541C CN 100409541 C CN100409541 C CN 100409541C CN B2005100604765 A CNB2005100604765 A CN B2005100604765A CN 200510060476 A CN200510060476 A CN 200510060476A CN 100409541 C CN100409541 C CN 100409541C
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- rotating shaft
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Abstract
The present invention relates to a spindle motor used for rotating a data recording disk. A related core structure of the present invention is characterized in that the center of a stator core is provided with a through hole, a plurality of electrodes are uniformly distributed on the circumference of the stator core, a distance R from a point on the outer outline of each of the electrodes to the center of the core is gradually contracted in the same direction, a ratio of the maximum distance R0 and the minimum distance R1 from the point on the outer outline of each of the electrodes of the stator core to the core is from 10.1 to 1.1, the number of the electrodes is from 4 to 10, and the outer outline of each of the electrodes of the stator core is in arc shape, in a straight line shape or in other curve shape. The present invention has the advantage of large starting moment, and the time of motor starting and the time that a motor rotor can reach the high speed balance and can rotate at a uniform speed are short.
Description
Technical field
The present invention relates to a kind of brshless DC motor, particularly a kind of spin data indicator (hereinafter being referred to as " CD ") that is used for is as CD, DVD, CD-ROM, the spindle motor of DVD-ROM.
Technical background
In Disc player, do not have under the prerequisite of vibration and eccentric motion at CD and rotating disk, electric rotating machine is rotary CD at full speed.In order to make not vibration and eccentric motion of electric rotating machine when rotation, the rotating disk of stablize in the process of optical disk high-speed rotation in the loading optical disk keeps the durability of CD balance and acquisition electric rotating machine all very important.
So there is the people to propose a kind of electric rotating machine (application number: 03122307.9) of Disc player by name, it comprises: the motor with rotating shaft, rotate and have the rotating disk of circular orbit groove jointly with rotating shaft, at the mobile member of orbital groove motion in orbital groove upper edge with the compensation eccentric force, the collision and the guiding device that scatters, wherein, because the frictional force between centrifugal force and orbital groove and the mobile member, when mobile member is arranged with non-homogeneous displacement, have from the collision of orbital groove height and the guiding device that scatters and cause occurring between the mobile member and make its separated rebound phenomena.
Rotor is partly set up mobile member will certainly make the weight of rotor rise, and the moment during the inevitable requirement electric motor starting increases, and also can prolong with the time that makes rotor reach the rotation of adjustment of balance average rate start-up time simultaneously.
Summary of the invention
The object of the invention is to provide a kind of staring torque big, brshless DC motor and special stater iron core thereof that the start-up time of motor and the time that makes rotor reach the rotation of adjustment of balance average rate lack, moment when having solved existing motor and partly setting up mobile member and make electric motor starting because of rotor increases, simultaneously start-up time and make rotor reach problems such as time that the adjustment of balance average rate rotates also can prolong.
Above-mentioned technical purpose of the present invention mainly solves by the following technical programs: brshless DC motor, comprise stator core, rotating shaft, rotor cap and the rotor of being located at the rotor cap inwall, rotating shaft is passed the through hole of stator core central authorities and be can be rotated to support in the stator core, rotor cap rotates with rotating shaft, the rotating shaft upper end is provided with and its dish core and pallet that rotates synchronously, the rotor cap bottom is provided with pcb board and PCB base plate, pallet is provided with the cannelure of circumferential closure, the cannelure below is provided with support plate, be provided with plurality of balls in the cavity that support plate and cannelure form, described rotating shaft below is provided with magnet steel, be evenly distributed with 4-10 the utmost point on the described stator core circumference, point on the outline of each utmost point dwindles toward same direction gradually to the distance R of core center, and the point on the utmost point outline of stator core is 1.01-1.1 to the ultimate range and minimum range R0: the R1 of core center.The point that stator core pole is designed on the outline arrives the distance R of core center toward the diminishing structure of same direction, according to magnetic conductance computing formula g (2 π μ)/(lnR/r), R represents point on the outline of each utmost point to the distance of core center, r represents the stator core internal diameter, because of the distance R of the point on the outline of each utmost point to core center differs everywhere, so magnetic conductance is also different, the magnetic force that promotes rotation is also inconsistent, magnetic conductance apart from general goal will be eager to excel than the magnetic conductance at the little place of distance, and loss is also less in air-gap.So the torque that its produces is also bigger, thereby the pushing motor rotor rotates to a certain direction, each structure that is not always the case on extremely, all magnetic force will directive promotion rotor rotation.Utilize the size of gaps of stator core and rotor magnetic steel to control motor magnetic circuit trend, the magnetic line of force that the iron core end that air gap is little passes through is intensive, the magnetic line of force ground that the iron core end that air gap is big passes through is evacuated, thereby make iron core be rapidly accelerated to constant rotational speed, thereby make motor shorten start-up time, in the shortest time, make rotor reach the adjustment of balance average rate and rotate.Wherein, the axial vibrations that causes because of deviation of gravity center in the time of can suppressing the rotating shaft high speed rotating by the magnetic attraction between magnet steel and rotating shaft guarantees the CD read and write data stability has been adapted to the requirement of the data in the high speed reads writing optical disk.
As preferably, the outline of the described utmost point is an arc; Or the outline of the described utmost point is a linear; The foreign steamer of the described utmost point also can be other shaped form.
As preferably, described PCB base plate is provided with the hollow convex body of epirelief, and described pcb board is provided with the through hole that can pass for described hollow convex body, and the end that described hollow convex body passes behind the pcb board through hole is provided with the structure of turning up.After circuit welds on the pcb board, place that pressurising can make pcb board and PCB base plate riveted on the punch press that is provided with the crimping head with pcb board and PCB base plate are overlapping, it has reduced manufacturing procedure of the present invention, can strengthen pcb board and PCB base plate symmetry with respect to rotating shaft, the deviation of gravity center degree is little when making motor rotation, increase the stability of motor rotation, improved the stability of data of optical disk read-write.
As preferably, described rotating shaft is provided with oiliness bearing outward, and described bearing inner face is provided with concave surface; Described concave surface is taper or arc, and the concave surface of described taper and the angle of shaft axis are 0.5 °-1.5 °.Wherein, the contact-making surface that concave surface can reduce rotating shaft and bearing is set, thereby has reduced friction and heating between rotating shaft and bearing, prolonged useful life of the present invention at the bearing inner face.
As preferably, the lower surface of described rotating shaft is cambered surface.Wherein, the rotating shaft lower surface is designed to arc can reduce friction between rotating shaft and its underpart supporter, has reduced the energy consumption of motor, and has prolonged the useful life of motor.
As preferably, described pallet is provided with the CD plate, is provided with spring between described CD plate and platen provided thereon, and the axial vibrations of spring available buffer machine shaft is set between CD plate and platen, has improved the stability of data of optical disk read-write.
The brshless DC motor special stater iron core, stator core central authorities are provided with through hole, be evenly distributed with several utmost points on the stator core circumference, point on the outline of each utmost point dwindles toward same direction gradually to the distance R of core center, point on the utmost point outline of stator core is 1.01-1.1 to the ultimate range and minimum range R0: the R1 of core center, described very 4-10, the outline of the utmost point of described stator core is arc or linear or other shaped form.
Therefore, it is big that the present invention has staring torque, start-up time of motor and make rotor reach characteristics such as time that the adjustment of balance average rate rotates is short.The point that stator core pole is designed on the outline arrives the distance R of core center toward the diminishing structure of same direction, according to magnetic conductance computing formula g (2 π μ)/(lnR/r), R represents point on the outline of each utmost point to the distance of core center, r represents the stator core internal diameter, because of the distance R of the point on the outline of each utmost point to core center differs everywhere, so magnetic conductance is also different, the magnetic force that promotes rotation is also inconsistent, magnetic conductance apart from general goal will be eager to excel than the magnetic conductance at the little place of distance, loss is also less in air-gap, so the torque that it produces is also bigger, thereby the pushing motor rotor rotates to a certain direction, each structure that is not always the case on extremely, all magnetic force will directive promotion rotor rotation.Utilize the size of gaps of stator core and rotor magnetic steel to control motor magnetic circuit trend, the magnetic line of force that the iron core end that air gap is little passes through is intensive, the magnetic line of force ground that the iron core end that air gap is big passes through is evacuated, thereby make iron core be rapidly accelerated to constant rotational speed, thereby make motor shorten start-up time, in the shortest time, make rotor reach the adjustment of balance average rate and rotate.Wherein, the axial vibrations that causes because of deviation of gravity center in the time of can suppressing the rotating shaft high speed rotating by the magnetic attraction between magnet steel and rotating shaft guarantees the CD read and write data stability has been adapted to the requirement of the data in the high speed reads writing optical disk.
Description of drawings
Accompanying drawing 2 is a kind of structural representations of looking up of the present invention;
Accompanying drawing 3 is a kind of plan structure schematic diagrames of the present invention;
Accompanying drawing 4 is partial enlarged drawings of pcb board of the present invention and the riveted joint of PCB base plate;
Accompanying drawing 5 is these fitting plane schematic diagrames that use novel stator core and rotor cap;
Accompanying drawing 6 is a kind of perspective view of stator core of the present invention.
Specific embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: as Fig. 1, Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5, motor comprises stator core 18, rotating shaft 1, rotor cap 6 and be located at the rotor 19 of rotor cap inwall, rotating shaft 1 is passed the through hole 182 of stator core central authorities and be can be rotated to support in the stator core, and rotor cap 6 rotates with rotating shaft, the rotating shaft upper end is provided with and its dish core 2 and pallet 5 that rotates synchronously, pallet 5 is provided with CD plate 12, and CD plate 12 tops are provided with beam 3, is provided with spring between CD plate 12 and platen provided thereon.Rotor cap 6 bottoms are provided with pcb board 13 and PCB base plate 14, and as shown in Figure 4, the PCB base plate is provided with the hollow convex body 16 of epirelief, and pcb board is provided with the through hole 15 that can supply hollow convex body 16 to pass, and the end that hollow convex body passes behind the pcb board through hole 15 is provided with the structure 17 of turning up.Pallet 5 is provided with the cannelure 4 of circumferential closure, and cannelure 4 belows are provided with support plate 10, is provided with 9 balls 11 in the cavity that support plate 10 and cannelure 4 form, rotating shaft is provided with oiliness bearing 8 outward, the bearing inner face is provided with concave surface 9, and concave surface 9 is taper, and the angle of taper concave surface and shaft axis is 1 °.The lower surface of rotating shaft 1 is cambered surface, rotating shaft 1 below is provided with magnet steel 7, be evenly distributed with 6 utmost points 181 on stator core 18 circumference, point on the outline of each utmost point 181 dwindles R to the distance R of core center gradually toward same direction and dwindles gradually toward same direction, and the point on the utmost point 181 outlines of definitely sub-iron core 18 is 1.1 to the ultimate range and minimum range R0: the R1 of core center.
As shown in Figure 5 and Figure 6, the stator core of brshless DC motor special use, stator core 18 central authorities are provided with through hole 182, be evenly distributed with 6 utmost points 181 on the stator core circumference, point on the outline of each utmost point 181 dwindles R to the distance R of core center gradually toward same direction and dwindles gradually toward same direction, and the point on the utmost point 181 outlines of definitely sub-iron core 18 is 1.1 to the ultimate range and minimum range R0: the R1 of core center.
According to magnetic conductance computing formula g (2 π μ)/(lnR/r), R represents point on the outline of each utmost point to the distance of core center, r represents the stator core internal diameter, because of the distance R of the point on the outline of each utmost point to core center differs everywhere, so magnetic conductance is also different, the magnetic force that promotes rotation is also inconsistent, the outline of the utmost point will be eager to excel than the magnetic conductance at minimum range R1 place to the magnetic conductance at the ultimate range R0 place of core center, loss is also less in air-gap, form magnetic line of force compact district A at ultimate range R0 place, form magnetic line of force dispersion area B at minimum range R1 place, so the torque that it produces is also bigger, thereby the pushing motor rotor rotates to a certain direction, each structure that is not always the case on extremely, and all magnetic force will directive promotion rotor rotation.Utilize the size of gaps of stator core and rotor magnetic steel to control motor magnetic circuit trend, the magnetic line of force that the iron core end that air gap is little passes through is intensive, the magnetic line of force ground that the iron core end that air gap is big passes through is evacuated, thereby make iron core be rapidly accelerated to constant rotational speed, thereby make motor shorten start-up time, in the shortest time, make rotor reach the adjustment of balance average rate and rotate.
Embodiment 2: be evenly distributed with 4 utmost points on the stator core circumference, point on the outline of each utmost point dwindles toward same direction gradually to the distance R of core center, and the point on the utmost point 181 outlines of stator core 18 is 1.01 to the ultimate range and minimum range R0: the R1 of core center.Other is with embodiment 1.
Embodiment 3: be evenly distributed with 10 utmost points 181 on the stator core circumference, point on the outline of each utmost point dwindles toward same direction gradually to the distance R of core center, and the point on the utmost point 181 outlines of stator core 18 is 1.05 to the ultimate range and minimum range R0: the R1 of core center.Other is with embodiment 1.
Claims (9)
1. brshless DC motor, comprise stator core (18), rotating shaft (1), rotor cap (6) and be located at the rotor (19) of rotor cap inwall, rotating shaft (1) is passed the through hole of stator core central authorities and be can be rotated to support in the stator core, rotor cap (6) rotates with rotating shaft, the rotating shaft upper end is provided with and its dish core (2) and pallet (5) that rotates synchronously, rotor cap (6) bottom is provided with pcb board (13) and PCB base plate (14), pallet (5) is provided with the cannelure (4) of circumferential closure, cannelure (4) below is provided with support plate (10), be provided with plurality of balls (11) in the cavity that support plate (10) and cannelure (4) form, it is characterized in that described rotating shaft (1) below is provided with magnet steel (7), be evenly distributed with 4-10 the utmost point (181) on described stator core (18) circumference, point on the outline of each utmost point (181) dwindles toward same direction gradually to the distance R of core center, and the point on the utmost point (181) outline of described stator core (18) is 1.01-1.1 to the ultimate range and minimum range R0: the R1 of core center.
2. brshless DC motor according to claim 1, the outline that it is characterized in that the described utmost point (181) is an arc.
3. brshless DC motor according to claim 1, the outline that it is characterized in that the described utmost point (181) is a linear.
4. brshless DC motor according to claim 1, it is characterized in that described PCB base plate is provided with the hollow convex body (16) of epirelief, described pcb board is provided with the through hole (15) that can supply described hollow convex body (16) to pass, and the end that described hollow convex body passes behind the pcb board through hole (15) is provided with the structure of turning up (17).
5. brshless DC motor according to claim 1, it is characterized in that described rotating shaft is provided with oiliness bearing (8) outward, described bearing inner face is provided with concave surface (9), and described concave surface (9) is taper or arc, and the concave surface of described taper and the angle of shaft axis are 0.5 °-1.5 °.
6. brshless DC motor according to claim 1 is characterized in that the lower surface of described rotating shaft (1) is cambered surface.
7. brshless DC motor according to claim 1 is characterized in that described pallet (5) is provided with CD plate (12), is provided with spring between described CD plate (12) and platen provided thereon.
8. brshless DC motor special stater iron core, stator core (18) central authorities are provided with through hole (182), be evenly distributed with several utmost points (181) on the stator core circumference, it is characterized in that: the point on the outline of each utmost point dwindles toward same direction gradually to the distance R of core center, point on the utmost point (181) outline of stator core (18) is 1.01-1.1 to the ultimate range and minimum range R0: the R1 of core center, described very 4-10.
9. brshless DC motor special stater iron core according to claim 8 is characterized in that the outline of the utmost point (181) of described stator core is arc or linear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100604765A CN100409541C (en) | 2005-08-24 | 2005-08-24 | Brushless dc electric machine and special stater iron core thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100604765A CN100409541C (en) | 2005-08-24 | 2005-08-24 | Brushless dc electric machine and special stater iron core thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1862913A CN1862913A (en) | 2006-11-15 |
| CN100409541C true CN100409541C (en) | 2008-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100604765A Expired - Fee Related CN100409541C (en) | 2005-08-24 | 2005-08-24 | Brushless dc electric machine and special stater iron core thereof |
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| Country | Link |
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| CN (1) | CN100409541C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120113583A (en) * | 2011-04-05 | 2012-10-15 | 삼성전기주식회사 | Spindle motor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2304209Y (en) * | 1997-07-18 | 1999-01-13 | 江衍煌 | Improvement of non-symmetrical stater mangetic pole |
| JPH11332193A (en) * | 1998-05-15 | 1999-11-30 | Japan Servo Co Ltd | Two-phase dc brushless motor |
| JP2002058180A (en) * | 2000-08-07 | 2002-02-22 | Denso Corp | Rotating electric machine |
| US6727630B1 (en) * | 2002-07-31 | 2004-04-27 | Wavecrest Laboratories, Llc. | Rotary permanent magnet electric motor with varying air gap between interfacing stator and rotor elements |
| CN2708559Y (en) * | 2004-06-10 | 2005-07-06 | 横店集团东磁有限公司 | Brushless DC main shaft motor |
| CN2717101Y (en) * | 2004-06-10 | 2005-08-10 | 横店集团东磁有限公司 | High accuracy and stability brushless direct current dynamo |
| CN2717097Y (en) * | 2004-06-10 | 2005-08-10 | 横店集团东磁有限公司 | Brushless motor |
-
2005
- 2005-08-24 CN CNB2005100604765A patent/CN100409541C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2304209Y (en) * | 1997-07-18 | 1999-01-13 | 江衍煌 | Improvement of non-symmetrical stater mangetic pole |
| JPH11332193A (en) * | 1998-05-15 | 1999-11-30 | Japan Servo Co Ltd | Two-phase dc brushless motor |
| JP2002058180A (en) * | 2000-08-07 | 2002-02-22 | Denso Corp | Rotating electric machine |
| US6727630B1 (en) * | 2002-07-31 | 2004-04-27 | Wavecrest Laboratories, Llc. | Rotary permanent magnet electric motor with varying air gap between interfacing stator and rotor elements |
| CN2708559Y (en) * | 2004-06-10 | 2005-07-06 | 横店集团东磁有限公司 | Brushless DC main shaft motor |
| CN2717101Y (en) * | 2004-06-10 | 2005-08-10 | 横店集团东磁有限公司 | High accuracy and stability brushless direct current dynamo |
| CN2717097Y (en) * | 2004-06-10 | 2005-08-10 | 横店集团东磁有限公司 | Brushless motor |
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| Publication number | Publication date |
|---|---|
| CN1862913A (en) | 2006-11-15 |
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