CN102088232B - Spindle motor and disc driving device - Google Patents
Spindle motor and disc driving device Download PDFInfo
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- CN102088232B CN102088232B CN 201010266585 CN201010266585A CN102088232B CN 102088232 B CN102088232 B CN 102088232B CN 201010266585 CN201010266585 CN 201010266585 CN 201010266585 A CN201010266585 A CN 201010266585A CN 102088232 B CN102088232 B CN 102088232B
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- drive motor
- spindle drive
- insulating trip
- base component
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Abstract
The invention provides a spindle motor and a disc driving device, wherein the spindle motor comprises a magnetic part fixed on a base and axially facing towards a magnet at an interval, and an insulating sheet arranged between the base and a coil to electrically ensure electrical insulation between the base and the coil. The insulating sheet has a cover part for covering upper surface of the radical edge of the magnetic part.
Description
Technical field
The present invention relates to spindle drive motor (spindle motor) and disk drive device.
Background technology
The spindle drive motor that dish is rotated centered by its central axis is installed in hard disk unit or optical disc apparatus.Spindle drive motor has the rotating part of the stationary part that is fixed in device case and supporting disk and rotation.The magnetic flux that the spindle drive motor utilization produces between stationary part and rotating part produces the torque centered by central axis, thereby rotating part is rotated with respect to stationary part.
In existing spindle drive motor, exist to have for rotating part is attracted to the spindle drive motor of the magnetic part of stationary part side.Magnetic part is fixed on stationary part, produces axial magnetic attraction between the magnet of this magnetic part and rotating part side.For example, record such magnetic ring in TOHKEMY 2001-309605 communique: this magnetic ring is installed on fixed part, to the axial force of rotor effect towards the below.In addition, in the 0034th section of TOHKEMY 2001-309605 communique, record " magnetic ring 42 is fixed in fixed part 21 by for example bonding agent ".
All the time effect has magnetic attraction between magnetic part and magnet.Therefore, if fixing insufficient with respect to stationary parts of magnetic part, then magnetic part might produce to the displacement of magnet side.Generally, in order to prevent that magnetic part to the displacement of magnet side, is fixed in stationary parts with magnetic part with enough constant intensities.
Yet, if make the spindle drive motor slimming and make magnetic part in axial attenuation, magnetic part produces local buckling easily.In this situation, if bonding agent is not applied to fully the lower surface of the end edge portion of magnetic part always, then in the easy displacement that produces to the magnet side of the end edge portion of magnetic part.
On the other hand, if prevent magnetic part end edge portion to the displacement of magnet side intrinsic parts are set, then the parts number of spindle drive motor increases.The increase of parts number is the main cause that the spindle drive motor cost rises.
Summary of the invention
Illustrative the first invention comprises: stationary part; And the rotating part that is supported freely with respect to the rotation of described stationary part.Rotating part has magnet.
Stationary part has base component, coil, magnetic part and insulating trip.Base component has the roughly incorporating section of cup-shaped, this incorporating section with respect to the central axis that extends up and down roughly the direction of quadrature expand, and open wide upward.Coil is accommodated in the incorporating section, and radially opposed across gap and magnet.Magnetic part is accommodated in the incorporating section, and is fixed in base component, and axially opposed across gap and magnet.
Insulating trip is configured between base component and the coil, is used for making base component and coil electric insulation.In addition, insulating trip has the cover section of the upper surface of the end edge portion radially that covers magnetic part.
Illustrative the first invention according to the application by the cover section of insulating trip, has suppressed the end edge portion of magnetic part to the displacement of magnet side.In addition, owing to utilize insulating trip to suppress the end edge portion of magnetic part to the displacement of magnet side, so can suppress the increase of the parts number of spindle drive motor.
Description of drawings
Fig. 1 is the partial, longitudinal cross-sectional of spindle drive motor.
Fig. 2 is the longitudinal section of disk drive device.
Fig. 3 is the longitudinal section of spindle drive motor.
Fig. 4 is the partial, longitudinal cross-sectional of spindle drive motor.
Fig. 5 is the partial, longitudinal cross-sectional of the related spindle drive motor of variation.
Fig. 6 is the partial, longitudinal cross-sectional of the related spindle drive motor of variation.
Fig. 7 is the partial, longitudinal cross-sectional of the related spindle drive motor of variation.
Fig. 8 is the partial, longitudinal cross-sectional of the related spindle drive motor of variation.
Fig. 9 is the partial top view of the related back end of variation (thrust yoke).
Figure 10 is the partial, longitudinal cross-sectional of the related back end of variation.
Figure 11 is near the longitudinal section of flexure strip.
Figure 12 is the longitudinal section of the related spindle drive motor of variation.
Figure 13 is the partial, longitudinal cross-sectional of the related spindle drive motor of variation.
Embodiment
Below, with reference to accompanying drawing, illustrative execution mode of the present invention is described.In addition, below, take the direction of opening wide along the direction of central axis as above-below direction, take the incorporating section of the roughly cup-shaped of base component as the top, shape and the position relationship of each parts described.But this has just defined above-below direction for convenience of explanation, and does not limit spindle drive motor involved in the present invention and the posture of disk drive device under the use state.
Fig. 1 is the partial, longitudinal cross-sectional of the related spindle drive motor of an embodiment of the invention 102.As shown in Figure 1, spindle drive motor 102 has stationary part 103 and rotating part 104.Rotating part 104 is supported in rotation mode freely with respect to stationary part 103.
Next, more preferred embodiment describe of the present invention.
Fig. 2 is the longitudinal section of disk drive device 1.Disk drive device 1 is the device of reading and/or writing that makes disk 12 (below, referred to as " dish 12 ") rotation and carry out information with respect to dish 12.As shown in Figure 2, disk drive device 1 has device case 11, dish 12, access (access) section 13 and spindle drive motor 2.
Device case 11 will be taken in dish 12, access section 13 and spindle drive motor 2 and be accommodated in inside.The top partes tegmentalis 11a sealing of device case 11.Access section 13 makes read/write head 13a move along the recording surface by the dish 12 of spindle drive motor 2 supporting, thereby carries out reading and writing with respect to the information of dish 12.In addition, access section 13 also can carry out any one party in the reading and writing of information with respect to 12 on dish.
Next, the structure of spindle drive motor 2 described.Fig. 3 is the longitudinal section of spindle drive motor 2.As shown in Figure 3, spindle drive motor 2 has: stationary part 3, and it is fixed in the device case 11 of disk drive device 1; And rotating part 4, its supporting disk 12, and rotation centered by central axis 9.
The bottom 31b of base component 31 and the 31c of wall section consist of the incorporating section 31e of the roughly cup-shaped that opens wide upward.Stator unit 32, back end 34, insulating trip 35 and aftermentioned rotor magnet 43 have preferably been taken in the inside of incorporating section 31e.On the other hand, circuit substrate 33 is configured in the radial outside of incorporating section 31e.In spindle drive motor 2, stator unit 32 and circuit substrate 33 are not overlapping in the axial direction, and stator unit 32 and circuit substrate 33 are configured in roughly the same height and position.Thus, the axial width that has suppressed spindle drive motor 2 integral body.
In addition, base component 31 can be the part of device case 11 as present embodiment both, also can be for being fixed in the other parts of device case 11.
Circuit substrate 33 is to be equipped with the substrate that coil 38 is provided the electronic circuit of drive current.Circuit substrate 33 in the present embodiment is made of flexible printed board (FPC).Circuit substrate 33 is fixed in the lateral surface of the 31c of wall section of base component 31 and the lower surface of outside flat part 31d by bonding agent etc.In addition, be formed with the 33a of soldering section at the position of the 31c of the wall section of being fixed in of circuit substrate 33.The end of the input side of the wire 38a that draws from coil 38 is connected with the 33a of soldering section.
Back end 34 is pressed into the inboard of the 31c of wall section of base component 31, and is fixed in the upper surface of bottom 31b by means such as bonding agents.The upper surface of back end 34 is axially opposed across the lower surface of gap and rotor magnet 43.Back end 34 is the magnetic parts that formed by magnetics such as electromagnetic steel plate (such as silicon steel plate etc.), ferromagnetism stainless steel (such as SUS430 etc.), cold-rolled steel sheets (such as SPCC, SPCE etc.).Magnetic part is preferably soft magnetic part.Back end 34 by its with rotor magnet 43 between the magnetic attraction that produces, with rotating part 4 attractions to stationary part 3 sides, thereby make the rotation stable posture of rotating part 4.
The axle 41 of rotating part 4 sides is supported by stationary axle bearing unit 36 in rotation mode freely.Stationary axle bearing unit 36 is fixed in the inboard of the cylindrical portion 31a of base component 31.Stationary axle bearing unit 36 has the sleeve 36a of general cylindrical shape shape and with the 36b of cap section of the closure of openings of the bottom of sleeve 36a.Between the outer peripheral face of the inner peripheral surface of sleeve 36a and axle 41, be filled with lubricating oil.
Rotating part 4 comprises axle 41, hub 42 and rotor magnet 43.
Axle 41 extends at above-below direction along central axis 9.Axle 41 forms the substantial cylindrical shape.Axle 41 inserts the inboard of sleeve 36a, and is supported in rotation mode freely with respect to stationary axle bearing unit 36.Hub 42 is fixed in axle 41 and rotates with axle 41.Hub 42 comprises the bearing-surface of supporting disk 12.
In such spindle drive motor 2, when supplying with drive current via 33 pairs of coils of circuit substrate 38, at a plurality of tooth 37b of section generations magnetic flux radially of stator core 37.Then, the effect by the magnetic flux between the 37b of tooth section and the rotor magnet 43 produces circumferential torque, thereby rotating part 4 rotates centered by central axis 9 with respect to stationary part 3.The dish 12 that is supported on hub 42 rotates centered by central axis 9 with axle 41 and hub 42.
Next, the more detailed structure of back end 34 and insulating trip 35 described.Fig. 4 is the partial, longitudinal cross-sectional that comprises the spindle drive motor 2 of back end 34 and insulating trip 35.
As shown in Figure 4, back end 34 comprises flat part 34a and protuberance 34b.Flat part 34a is fixed in the upper surface of the bottom 31b of base component 31.Flat part 34a forms circular.Protuberance 34b extends upward from the outer edge of flat part 34a.Back end 34 has high rigidity by having protuberance 34b near the outer edge.
The 35b of cover section extends to the top position of the end edge portion 34c of the radially inner side of back end 34 from the outer edge of insulating trip main part 35a.Therefore, the part of the 35b of cover section covers the upper surface of the end edge portion 34c of back end 34.In addition, in the present embodiment, the end edge portion 34c butt of the 35b of cover section and back end 34.Therefore, end edge portion 34c is sandwiched between the 35b of cover section of the bottom 31b of base component 31 and insulating trip 35.
When the end edge portion 34c of back end 34 wanted to be shifted upward by the magnetic attraction between back end 34 and the rotor magnet 43, end edge portion 34c was subject to downward resistance from the 35b of cover section.Thus, suppressed the end edge portion 34c displacement upward of back end 34.
Particularly, the flat part 34a of back end 34 forms axially upper thin sheet.Therefore, produce easily the bending of part at the flat part of back end 34.Therefore, if the 35b of cover section and bonding agent is not applied to fully the lower surface of the end edge portion 34c of back end 34 not then produces upward displacement at the end edge portion 34c of back end 34 easily always.In the present embodiment, the 35b of cover section of insulating trip 35 suppresses the end edge portion 34c displacement upward of back end 34.That is, spindle drive motor 2 uses the back end 34 of sheet can either suppress the axial width of spindle drive motor 2, can suppress again the end edge portion 34c displacement upward of back end 34.
In addition, in the structure of present embodiment, except insulating trip 35, can dispose for the parts that suppress back end 34 displacement upward.Thus, can suppress the increase of the parts number of spindle drive motor 2.Its result is further to have suppressed the axial width of spindle drive motor 2.
The insulating trip main part 35a of insulating trip 35 is sandwiched between the bottom 31b and coil 38 of base component 31.That is, the upper surface butt of the lower surface of insulating trip main part 35a and the bottom 31b of base component 31, the upper surface of insulating trip main part 35a and coil 38 butts.Thus, suppressed insulating trip 35 self displacement upward.Therefore, further suppressed the end edge portion 34c displacement upward of back end 34.In addition, the bottom 31b of base component 31, insulating trip 35 and coil 38 are in axial compact configuration.Thus, the axial width that has further suppressed spindle drive motor 2.
In the bottom of base component 31 31b formation the through hole 31f that extends is vertically arranged.Through hole 31f is positioned at the below of coil 38.In insulating trip 35 formations the peristome 35c that is communicated with through hole 31f is arranged.In addition, insulating trip 35 comprises extend, the insulating trip cylinder 35d of section cylindraceous in position on every side from peristome 35c downwards.The insulating trip cylinder 35d of section embeds among the through hole 31f of base component 31.
Through hole 31f is by bonding agent 39 sealings.Thus, the inner space of device case 11 and space outerpace are separated comes.In addition, bonding agent 39 is fixed in base component 31 with the insulating trip cylinder 35d of section of insulating trip 35.By insulating trip 35 is fixed in base component 31, suppressed insulating trip 35 self displacement upward.Therefore, further suppressed the end edge portion 34c displacement upward of back end 34.
In addition, insulating trip 35 configured in one piece must be leaned on radially inner side than the inner peripheral surface of rotor magnet 43.That is, insulating trip 35 is configured in not and the position of rotor magnet 43 at axial overlap.Therefore, even the 35b of cover section of insulating trip 35 is crooked upward, insulating trip 35 can not contact with rotor magnet 43 yet.In addition, because insulating trip 35 does not contact with rotor magnet 43, therefore can between insulating trip 35 and rotor magnet 43, not guarantee axially spaced-apart.The axial width that therefore, can further suppress spindle drive motor 2.
Next, variation is described.In addition, the basic structure of following variation is identical with the structure of Fig. 3 and Fig. 4.Below, mainly the part different from Fig. 3 and Fig. 4 described.
For example, as shown in Figure 5, the 235b of cover section of insulating trip 235 also can contact with the upper surface face of the end edge portion 234c of back end 234.In the example of Fig. 5, because the 235b of cover section lodging is at the upper surface of back end 234, so further suppressed the axial dimension of insulating trip 235.
In addition, as shown in Figure 6, the 335b of cover section of insulating trip 335 also can separate from the end edge portion 334c of back end 334 be arranged at gap the top.In the example of Fig. 6, when the end edge portion 334c of back end 334 displacement upward occured, end edge portion 334c and the 335b of cover section butt were subject to downward resistance from the 335b of cover section.Thus, suppressed further upward displacement of end edge portion 34c.
But, in order further to suppress the axial dimension of insulating trip 335, the 335b of cover section of preferred insulating trip 335 and the end edge portion 334c butt of back end 334.
In addition, as shown in Figure 7, coil 438 also can from insulating trip main body 435a separate be arranged at gap the top.In the example of Fig. 7, insulating trip 435 is fixed in base component 431 by bonding agent 439.Thus, prevented the displacement upward of insulating trip 435 integral body.If insulating trip 435 has produced local displacement upward, this displacement also can stop in the moment of insulating trip 435 with the lower surface butt of coil 438.That is, insulating trip 435 shift amount upward is subject to coil 438 restrictions.Therefore, the end edge portion 434c displacement upward of back end 434 also is limited.
In addition, as shown in Figure 8, the end edge portion 534c of the radially inner side of back end 534 also can extend to the lower position of coil 538 and insulating trip 535.In the example of Fig. 8, the end edge portion 534c of the radially inner side of back end 534 is sandwiched between the bottom 531b of coil 538 and insulating trip 535 and base component 531.Therefore, further suppressed the end edge portion 534c of back end 534 with respect to the bottom 531b displacement upward of base component 531.
In addition, in the example of Fig. 8, also can separate between back end 534 and the insulating trip 535 and between insulating trip 535 and the coil 538.
In addition, back end 34 also can have the structure of the constant intensity between further raising and the base component 31.Fig. 9 is the partial top view of the related back end of variation 634.In addition, Figure 10 is the partial, longitudinal cross-sectional of the back end 634 observed from the X-X position of Fig. 9.The back end 634 of Fig. 9 and Figure 10 has fixed part 634d.
Figure 11 is near the longitudinal section of the flexure strip 634f of the back end 634 among Fig. 9 and Figure 10 when being fixed in base component 31.The 31c of wall section of base component 31 has and the opposed barrel surface 31g of the outer peripheral face of back end 634.The barrel surface 31g butt of flexure strip 634f and the 31c of wall section and to the radially inner side deflection.Therefore, back end 634 is firmly fixed at base component 31 by the resistance radially between flexure strip 634f and the barrel surface 31g.
Particularly, flexure strip 634f makes bight 634g between its upper surface and the outer peripheral face and the barrel surface 31g butt of base component 31.Then, by the elastic force of flexure strip 634f, bight 634g presses barrel surface 31g.Therefore, when back end 634 is subject to upwards power, because bight 634g and barrel surface 31g elasticity butt, so suppressed back end 634 movement upward.
When back end 34 is fixed in base component 31, flexure strip 634f bending corresponding to the size of the barrel surface 31g of base component 31.Therefore, the situation that is pressed into base component 31 with the back end 34 that will not have flexure strip 634f is compared, can reduce base component 31 barrel surface 31g require dimensional accuracy.
In addition, in the example of Fig. 9 and Figure 10, the upper-end part of driving of flexure strip 634f is in the position on the lower, upper end than protuberance 634b.Like this, when back end 634 is installed on base component 31, the upper end of under the state not according to compression elasticity sheet 634f, pressing protuberance 634b easily.Therefore, can be under the state that flexure strip 634f is not applied excessive external force downwards, back end 634 is installed on base component 31.
In the example of Fig. 9 and Figure 10, flexure strip 634f is formed between the 634e of pair of notches section.Thus, under the state that flexure strip 634f is exceedingly protruded to radial outside, guaranteed the radical length of flexure strip 634f, and it is flexible that flexure strip 634f is had.In addition, can prevent the distortion at other position in the back end 634 and only make flexure strip 634f deflection.
In addition, in the example of Fig. 9 and Figure 10, the end of the radially inner side of notch 634e is positioned at the position of leaning on radially inner side than the outer edge of flat part 634a.Like this, can confirm that flat part 634a is with respect to the stationary state of the bottom 31b of base component 31.For example, can confirm between bottom 31b and the flat part 634a the gap have or not and bottom 31b and flat part 634a between the coating state of bonding agent.
In addition, fixed part 634d both can only be arranged at a position of back end 634, also can be arranged at a plurality of positions of back end 634.But, have the fixed part 634d that two places are above, preferred three places are above, can further improve back end 634 with respect to the positional precision of central axis 9.
In addition, as shown in Figure 12, spindle drive motor 702 also can have at the radially inner side of stator unit 32 rotor magnet 43.Figure 13 is the partial, longitudinal cross-sectional of the spindle drive motor 702 among Figure 12.In addition, in Figure 12 and Figure 13, to being marked with the label identical with Fig. 4 with Fig. 3 with position corresponding to each position of the spindle drive motor 2 of above-mentioned execution mode.
In this spindle drive motor 702, also the lower position at rotor magnet 43 disposes back end 34.In addition, between the bottom of base component 31 31b and coil 38, dispose insulating trip 35.And insulating trip 35 has the 35b of cover section of top of end edge portion 34c of the radial outside of back end of covering 34.Therefore, by the 35b of cover section, suppressed the end edge portion 34c displacement upward of back end 34.In addition, owing to utilize insulating trip 35 to suppress the end edge portion 34c displacement upward of back end 34, so can suppress the increase of the parts number of spindle drive motor 702.
In addition, the present invention is not limited to above-mentioned illustrative execution mode and variation, can also carry out various distortion.
The 35b of cover section of insulating trip 35 both can complete cycle ground covers the end edge portion 34c of back end 34, also can cover partly the end edge portion 34c of back end 34.That is, at least a portion of the end edge portion 34c of the 35b of cover section of insulating trip 35 covering back end 34 gets final product.
In addition, back end 34 can be circular as above-mentioned execution mode, as another example, also can be C word shape, that is, its circumferential both ends are mutually opposed circular-arc.
In addition, the present invention also can be applied to make disk dish, the spindle drive motor of for example optical disk rotary and the disk drive device with this spindle drive motor in addition.
The present invention can be used in spindle drive motor and disk drive device aptly.
Only selected selected execution mode that the present invention is described.Yet, to those skilled in the art, obviously can according to above-mentioned be documented in not break away from the scope of the present invention that claims limit carry out various changes and modification.In addition, only be used for explaining based on the foregoing description of embodiments of the present invention, rather than in order to limit by claims and the defined the present invention of equivalent thereof.
Claims (12)
1. spindle drive motor, described spindle drive motor comprises:
Stationary part; And
Rotate the rotating part that is supported freely with respect to described stationary part;
It is characterized in that,
Described rotating part has magnet,
Described stationary part has:
Base component, this base component have the roughly incorporating section of cup-shaped, this incorporating section with respect to the central axis that extends up and down roughly the direction of quadrature expand, and open wide upward;
Coil, this coil is accommodated in described incorporating section, and radially opposed across gap and described magnet;
The magnetic part that contains the sheet flat part, this magnetic part is accommodated in described incorporating section, and is fixed in described base component, and axially opposed across gap and described magnet; And
Insulating trip, this insulating trip are configured between described base component and the described coil, are used for making described base component and described coil electric insulation,
Described insulating trip has the cover section of the upper surface of the end edge portion radially that covers described magnetic part.
2. spindle drive motor according to claim 1, wherein,
The described end edge portion butt of the described cover section of described insulating trip and described magnetic part.
3. spindle drive motor according to claim 1 and 2, wherein,
The upper surface butt of the lower surface of described insulating trip and described base component, the upper surface butt of described coil and described insulating trip.
4. spindle drive motor according to claim 1, wherein,
The described end edge portion of described magnetic part is positioned at the below of described coil and described insulating trip.
5. spindle drive motor according to claim 1, wherein,
Described insulating trip is fixed in described base component by bonding agent.
6. spindle drive motor according to claim 5, wherein,
Described base component has the through hole that forms vertically below described coil,
Described insulating trip has the insulating trip cylinder section that is disposed in the described through hole,
Described bonding agent seals described through hole, and described base component is fixed in described insulating trip cylinder section.
7. spindle drive motor according to claim 1, wherein,
Described insulating trip and described magnet be not axially overlapping.
8. spindle drive motor according to claim 1, wherein,
Described magnet is positioned at the radial outside of described coil,
Described base component has and the opposed barrel surface of the outer peripheral face of described magnetic part,
Described magnetic part has:
The protuberance that extends upward from the outer edge of described flat part;
Be arranged at the pair of notches section of described protuberance; And
Be configured between the described pair of notches section, have a flexible flexure strip,
The described barrel surface butt of described flexure strip and described base component,
Described flat part is circular.
9. spindle drive motor according to claim 8, wherein,
Described flexure strip is crooked upward from the outer edge of described flat part,
At the upper surface of described flexure strip and the described barrel surface butt of the bight between the outer peripheral face and described base component.
10. according to claim 8 or 9 described spindle drive motors, wherein,
The upper-end part of driving of described flexure strip is in the position on the lower, upper end than described protuberance.
11. spindle drive motor according to claim 8, wherein,
The end of the radially inner side of described notch is positioned at the position of leaning on radially inner side than the outer edge of described flat part.
12. a disk drive device is characterized in that,
Described disk drive device comprises:
Spindle drive motor claimed in claim 1;
Access section, the dish that this access section keeps with respect to the described rotating part by described spindle drive motor carry out reading of information and write at least one party; And
Housing, this housing are taken in described spindle drive motor and described access section.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009278176 | 2009-12-08 | ||
| JP2009-278176 | 2009-12-08 | ||
| JP2010-131015 | 2010-06-08 | ||
| JP2010131015A JP2011142792A (en) | 2009-12-08 | 2010-06-08 | Spindle motor and disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102088232A CN102088232A (en) | 2011-06-08 |
| CN102088232B true CN102088232B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010266585 Expired - Fee Related CN102088232B (en) | 2009-12-08 | 2010-08-27 | Spindle motor and disc driving device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6663943B2 (en) * | 2018-02-22 | 2020-03-13 | 本田技研工業株式会社 | Vehicle drive system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001309605A (en) * | 2000-04-20 | 2001-11-02 | Nippon Densan Corp | Motor |
| CN101465580A (en) * | 2007-12-18 | 2009-06-24 | 日本电产株式会社 | Oil-repellent film forming method, motor manufacturing method and motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100756575B1 (en) * | 2005-06-30 | 2007-09-07 | 닛뽕빅터 가부시키가이샤 | Motor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001309605A (en) * | 2000-04-20 | 2001-11-02 | Nippon Densan Corp | Motor |
| CN101465580A (en) * | 2007-12-18 | 2009-06-24 | 日本电产株式会社 | Oil-repellent film forming method, motor manufacturing method and motor |
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| CN102088232A (en) | 2011-06-08 |
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