JP5240659B2 - Motor and recording disk drive device - Google Patents

Description

  The present invention relates to an electric motor and a recording disk driving device including the motor.

  In a recording disk drive device such as a hard disk drive device, a spindle motor (hereinafter simply referred to as “motor”) that rotates the recording disk is provided in a housing, and a circuit board that controls the motor, a circuit board, a stator of the motor, Is connected to the outside of the housing. In the motor, the lead wire of the stator drawn out of the housing through the through hole of the housing is soldered to the wiring of the connector member.

By the way, in patent document 1, the connector pin which connects a circuit board and an electronic component is disclosed, and a gold plating layer is formed in the soldering area | region where a circuit board and an electronic component are each soldered to a connector pin, A mixed layer of nickel and gold is formed in the non-soldering area between the two soldering areas. Since the wettability of the non-soldering area is lower than the wettability of the soldering area, the solder spread is limited by the non-soldering area when soldering the connector pin and the electronic component, and the solder spreads to the circuit board. This prevents short circuit of the circuit board pattern. Also in the connector terminal disclosed in Patent Document 2, the surface of the terminal portion to which the printed wiring board is soldered is plated with gold, and the surface of the portion between the terminal portion and the end opposite to the terminal portion By applying nickel plating to the solder, the spread of the solder applied to the terminal portion is suppressed.
JP 2004-277837 A JP 2004-152750 A

  By the way, in a motor having a structure in which a connector member is attached to a recess formed on the outside of the housing, when the conductor drawn out through the through hole formed in the recess and the connector member are joined by solder, the conductor When the solder around the swells up, a defective height of the joining portion occurs, and there is a possibility that the end part and the solder after cutting the lead wire come into contact with the parts around the recording disk drive device. Further, in order to solve this problem, for example, when soldering is performed in a state in which the end portion of the conducting wire is bent toward the inner wall of the recess, a conventional wet plating with high wettability is applied to the joining portion with the conducting wire. In the connector member, the solder spreads to the vicinity of the inner wall of the recess, and it is difficult to cut the conductive wire without damaging the housing.

  The present invention has been made in view of the above-described problems, and when the stator conductor is soldered to the wiring portion of the connector member in a state toward the central axis of the motor, the solder spreads to the tip of the wiring portion. The purpose is to prevent and easily cut the conductor without damaging the base part after soldering.

  The invention according to claim 1 is an electric motor including a stator portion and a rotor portion that is rotatably supported with respect to the stator portion about a central axis, and the stator portion is a stator. And a base member to which the stator is attached, and a connector member that is attached to the opposite side of the base to the stator and that connects the lead wires of the stator and the circuit board, and has a plurality of wiring portions that extend substantially parallel to each other. And the base portion includes a central region in which the central axis is located in the center, a peripheral region located on the stator side with respect to the central region around the central region, and at least the center from within the central region A recess formed in a region between the region and the peripheral region, wherein at least a part of the connector member is disposed, and the central axis in the recess A through-hole penetrating in a parallel direction is provided, and each of the plurality of wiring portions is a tip portion that is close to or in contact with a side wall of the recess, and a nickel-plated nickel-plated portion and the nickel-plated portion A gold-plated portion provided with a continuous gold-plating, and the gold-plated portion is a hole shape or a notch shape that overlaps in the direction parallel to the through hole and the central axis, and the lead wire is drawn from the through hole. An end portion is inserted, and the end portion of the conducting wire inserted into the insertion portion is soldered to the gold plating portion in a state toward the central axis.

  A second aspect of the present invention is the motor according to the first aspect, wherein the end portions of the conductive wires and the solder for fixing the end portions to the plurality of wiring portions are located in the recesses.

  Invention of Claim 3 is a motor of Claim 1 or 2, Comprising: The front-end | tip of the said edge part of the said conducting wire is located between the edge of the said nickel plating part, and the said side wall, or the said Located on the edge.

  The invention according to claim 4 is a recording disk drive device, wherein the motor according to any one of claims 1 to 3 that rotates the recording disk, and an access unit that reads or writes information on the recording disk; And a housing for housing the motor and the access portion.

  According to the present invention, when the conductor wire of the stator is soldered to the wiring portion of the connector member, it is possible to prevent the solder from spreading to the tip portion of the wiring portion, and to easily conduct the wire without damaging the base portion after soldering. Can be cut.

  FIG. 1 is a longitudinal sectional view showing an internal configuration of a recording disk drive device 60 including an electric spindle motor 1 (hereinafter referred to as “motor 1”) according to an embodiment of the present invention, and shows a central axis J1. The right and left of FIG. 2 indicate cross sections from different directions. The recording disk drive 60 is a so-called hard disk drive, and is a disk-shaped recording disk 62 for recording information, an access unit 63 for reading and writing information to the recording disk 62, and a motor that holds and rotates the recording disk 62. 1, and a housing 61 that accommodates the motor 1, the recording disk 62, and the access unit 63 in the internal space 610.

  The housing 61 has an opening at the top, and a cover-less box-shaped first housing member 611 to which the motor 1 and the access unit 63 are attached at the bottom, and an internal space 610 by covering the opening of the first housing member 611. A plate-shaped second housing member 612 is provided. In the recording disk driving device 60, the second housing member 612 is joined to the first housing member 611 to form the housing 61, and the internal space 610 is a clean space with extremely little dust and dirt.

  The recording disk 62 is placed on the upper side of the motor 1 and is fixed to the motor 1 by the clamper 621. The access unit 63 includes a head 631 that magnetically reads and writes information in the vicinity of the recording disk 62, an arm 632 that supports the head 631, and moves the arm 632 to move the head 631 to the recording disk 62 and the motor. 1 has a head moving mechanism 633 that moves relative to 1. With these configurations, the head 631 accesses a required position of the recording disk 62 in the state of being close to the rotating recording disk 62, and reads and writes information.

  FIG. 2 is a longitudinal sectional view of the motor 1. The motor 1 is an outer rotor type motor, and includes a stator portion 2 that is a fixed assembly and a rotor portion 3 that is a rotary assembly. In the following description, the rotor unit 3 side is described as the upper side and the stator unit 2 side is defined as the lower side along the central axis J1 of the motor 1, but the central axis J1 does not necessarily coincide with the direction of gravity.

  The rotor unit 3 includes a substantially disc-shaped rotor hub 31 to which a recording disk 62 (see FIG. 1) is fixed, a substantially cylindrical yoke 32 protruding downward from the outer peripheral edge of the rotor hub 31 (that is, the stator unit 2 side), A multi-pole magnetized field magnet 33 fixed to the inner peripheral surface of the yoke 32, a substantially cylindrical shape centering on the central axis J1 and projecting downward from the center of the rotor hub 31, and A substantially disc-shaped thrust plate 35 attached to the lower end of the shaft 34 is provided.

  The stator portion 2 includes a base portion 21 which is a part of a first housing member 611 (see FIG. 1), a substantially cylindrical bottomed sleeve unit 22 disposed inside a cylindrical holder 211 of the base portion 21, and a holder 211. And a connector member 4 attached to a surface of the base portion 21 opposite to the surface to which the stator 23 is attached (hereinafter referred to as “base surface 212”). As shown by a two-dot chain line in FIG. 2, a circuit board 24 for controlling the motor 1 is attached to the base surface 212, and the circuit board 24 and the stator 23 are electrically connected by the connector member 4.

  The sleeve unit 22 includes a substantially cylindrical sleeve body 221 into which the shaft 34 of the rotor unit 3 is inserted, a bottomed cylindrical sleeve housing 222 fixed to the outer peripheral surface of the sleeve body 221, and an upper side of the sleeve body 221. An annular seal member 223 is provided. The sleeve body 221 is a porous member, and the sleeve housing 222 and the seal member 223 serve to hold the lubricating oil impregnated in the sleeve body 221. The lower portion of the sleeve housing 222 is fixed by press fitting inside the holder 211 of the base portion 21.

  The stator 23 has an annular shape centered on the central axis J1, and includes a stator core 231 having a plurality of radially arranged teeth 233, and a plurality of coils 232 formed by winding conductive wires around the plurality of teeth 233. Prepare. The stator 23 opposes the field magnet 33 of the rotor unit 3 in a direction perpendicular to the central axis J1, and a rotational force (torque) centered on the central axis J1 is between the stator 23 and the field magnet 33. Occur.

  In the motor 1, a fluid dynamic pressure bearing mechanism is formed by the sleeve unit 22, the shaft 34, and the lubricating oil, and the rotor unit 3 (and the recording disk 62 (see FIG. 1)) moves the central axis J <b> 1 through the fluid dynamic pressure bearing mechanism. It is rotatably supported with respect to the stator part 2 as a center.

  FIG. 3 is a bottom view of the base portion 21 and shows the connector member 4 with a two-dot chain line. As shown in FIGS. 2 and 3, the base surface 212 has a substantially annular central region 2121 in which the central axis J <b> 1 is located in the center, and is positioned closer to the stator 23 in FIG. 2 than the central region 2121 around the central region 2121. The peripheral region 2122 and a recess 2123 extending in the radial direction centering on the central axis J1 from the vicinity of the lower end of the holder 211 (see FIG. 2) to the boundary between the central region 2121 and the peripheral region 2122 are provided. The recess 2123 is provided with a through hole 213 penetrating in a direction parallel to the central axis J1. Further, the end portion of the connector member 4 on the central axis J1 side is disposed in the concave portion 2123. As shown in FIG. 2, in the motor 1, the entire connector member 4 is above the surface of the central region 2121 of the base portion 21. (Ie, on the stator 23 side).

  As shown in FIG. 3, a groove 2123a extending in a direction perpendicular to the radial direction is provided on the outer side in the radial direction (hereinafter simply referred to as “radial direction”) centering on the central axis J1 of the through hole 213. The groove 2123a is used for holding an adhesive used when the connector member 4 is mounted on the base surface 212. In FIG. 2, the groove 2123a is not shown.

  4 and 5 are a bottom view and a side view of the connector member 4. As shown in FIGS. 4 and 5, the connector member 4 has three wiring parts 41 extending substantially in parallel to each other, and a resin molding part 42 formed around the wiring part 41 by insert molding. As shown in FIG. 4, the resin molding portion 42 has a substantially plate-like first plate-like portion 421 located on the left side in FIG. 4 and a direction perpendicular to the direction in which the wiring portion 41 extends from the first plate-like portion 421. The second plate-like portion 422 having a substantially plate shape with a small width is provided. As shown in FIG. 5, the portion between the first plate-like portion 421 and the second plate-like portion 422 is the second plate-like portion 422. Is a step portion located above the first plate-like portion 421.

  The first plate-like portion 421 has a thin tip, and the first connection terminal 411 that is the left end of the wiring portion 41 in FIG. 5 is exposed downward. Further, the first plate-like portion 421 has a protruding portion 4211 protruding upward, and as shown in FIGS. 4 and 5, the protruding portion 4211 penetrates the protruding portion 4211 in the direction in which the protruding portion 4211 extends. Three holes 4211a are provided.

  FIG. 6 is an enlarged view showing the first connection terminal 411 of the wiring portion 41. The first connection terminal 411 includes a nickel plating part 51 which is a tip part of the first connection terminal 411 and which is plated with nickel, and a gold plating part 52 which is plated with gold continuously from the nickel plating part 51. The gold plating portion 52 is provided with a hole-like portion (hereinafter referred to as “hole portion 4111”). In FIG. 6, the nickel plating part 51 and the gold plating part 52 are given different parallel oblique lines, and the boundary between the gold plating part 52 and the nickel plating part 51 is indicated by a broken line. As shown in FIGS. 4 and 5, each of the three holes 4111 overlaps with the hole 4211a of the protrusion 4211 in the direction in which the protrusion 4211 extends (that is, the vertical direction in FIG. 5).

  As shown in FIG. 2, one end of the connector member 4 including the first connection terminal 411 is disposed in the recess 2123 of the base portion 21, and the protruding portion 4211 is located in the through hole 213 of the base portion 21. For this reason, the through-hole 213, the hole part 4111 of the 1st connection terminal 411, and the hole part 4211a (refer FIG. 4 and FIG. 5) of the protrusion part 4211 overlap in the direction parallel to the central axis J1.

  In the connector member 4, the first connection terminal 411 and the conductor 2321 of the stator 23 are joined via the solder 25, and the second connection terminal 412 opposite to the first connection terminal 411 protrudes downward in FIG. 2. The bent portion 4121 and the circuit board 24 come into contact with each other, whereby the stator 23 and the circuit board 24 are electrically connected. Further, the first connection terminal 411 and the solder 25 are covered with the resin material 26 to ensure insulation.

  FIG. 7 is a bottom view of the motor 1 in which the vicinity of the connector member 4 in FIG. 2 is enlarged, and illustration of the resin material 26 provided in the recess 2123 of the base portion 21 is omitted. In a state in which the connector member 4 is attached to the base portion 21, the three wiring portions 41 of the connector member 4 extend in a substantially radial direction centered on the central axis J1, and the nickel plating portion 51 (that is, the wiring portion 41). The tip end portion of the concave portion 2123 is close to the side wall 2123b of the recess 2123 in the radial direction.

  8 is an enlarged cross-sectional view showing the vicinity of the tip of the first connection terminal 411 of the connector member 4 in FIG. In FIG. 8, similar to FIG. 6, the nickel plating portion 51 and the gold plating portion 52 of the first connection terminal 411 are given different parallel oblique lines, and the boundary between the nickel plating portion 51 and the gold plating portion 52 is indicated by a broken line. (The same applies to the following figures). As shown in FIGS. 7 and 8, on the gold plating portion 52, the end portion of the conducting wire 2321 of the stator 23 is directed to the central axis J1 (see FIG. 7) (that is, directed to the tip end of the connector member 4). The tip of the end portion of the conductive wire 2321 is located on the nickel plating portion 51. In the connector member 4, since the wettability of the nickel plating part 51 is lower than the wettability of the gold plating part 52, the solder 25 for fixing the end of the conductive wire 2321 on the gold plating part 52 (in FIG. Is prevented from spreading radially inward from the gold-plated portion 52. Further, the end portion of the conductive wire 2321, the solder 25 and the resin material 26 (see FIG. 8) are located in the recess 2123 of the base portion 21, and prevent them from coming into contact with other components arranged on the central region 2121. Is done.

  FIG. 9 is a cross-sectional view showing a part of the base portion 21 to which the stator 23 and the connector member 4 are attached in the course of assembling the motor 1, and FIG. 9 is upside down with respect to FIG. When the stator portion 2 is assembled, first, the conductive wire 2321 of the stator 23 is pulled out to the outside of the base portion 21 through the through hole 213 of the base portion 21 with the base portion 21 being turned upside down. The stator 23 is fixed to the holder 211 of the base portion 21 by press fitting or the like.

  Next, the conductive wire 2321 is inserted into the hole 4211a of the protruding portion 4211 and the hole 4111 of the first connection terminal 411 from the lower side of the connector member 4 in FIG. 9 toward the upper side (that is, the lower side in FIG. 2). The protruding portion 4211 is press-fitted into the through hole 213 of the base portion 21. Further, an adhesive is held in advance in the groove 2123 a of the recess 2123 shown in FIG. 3 in the base portion 21, and the connector member 4 is bonded to the base portion 21. As described above, the connector member 4 is fixed to the base portion 21 by press-fitting and bonding, and one end portion including the first connection terminal 411 is disposed in the recess 2123 of the base portion 21.

  Thereafter, the conductive wire 2321 is bent toward the central axis J1 side (left side in FIG. 9), and soldered in a state where the conductive wire 2321 is directed to the central axis J1 on the gold plating portion 52 of the wiring portion 41 as shown in FIG. Is done. At this time, the solder does not spread in the nickel plating part 51, which has lower wettability than the gold plating part 52, and a gap is provided between the part on the side of the central axis J 1 of the side wall 2123 b of the recess 2123 of the base part 21 and the solder 25. Then, the operator inserts the tip of the nipper into the gap, and the conductive wire 2321 is cut on the nickel plating portion 51.

  In the motor 1, the lead wire 2321 is cut in the recess 2123, thereby preventing the lead wire 2321 and the surrounding solder from protruding from the recess 2123 upward in FIG. 10 in the central region 2121.

  When the joining operation between the conductive wire 2321 and the connector member 4 is completed, a thermosetting resin material is applied to the recess 2123 to cover the end portion of the conductive wire 2321 and the solder 25, and the resin material is heated and cured. Then, the upper and lower sides of the base portion 21 are inverted, and the sleeve unit 22 is fixed inside the holder 211 as shown in FIG.

  As described above, in the motor 1, when the conductive wire 2321 is soldered to the first connection terminal 411 of the connector member 4, the solder 25 on the gold plating portion 52 extends to the tip portion (that is, the nickel plating portion 51). Spreading is prevented. Thus, in the connector member 4, since the spread of the solder 25 is adjusted by the nickel plating part 51 and the gold plating part 52, the operator can easily cut the conductive wire 2321 without damaging the base part 21 after soldering. Thus, the workability of joining the conductive wire 2321 and the connector member 4 is improved.

  FIG. 11 is a diagram showing another preferred example of the cutting position of the conductive wire 2321, and illustration of solder and resin material is omitted. In the example shown in FIG. 11, when joining the conductive wire 2321 and the connector member 4, the tip of the end of the conductive wire 2321 is the edge 4111 a (that is, the tip) of the nickel-plated portion 51 of the connector member 4 and the concave portion of the base portion 21. Conductive wire 2321 is cut so as to be positioned between side wall 2123b of 2123. When the gap between the edge 4111a and the side wall 2123b is sufficiently large with respect to the size of the tip of the cutting tool, the conductor 2321 can be easily cut as shown in FIG. 11 while the tip of the tool is placed in the gap. Can do. Depending on the shape of the tip of the tool, the tip of the end of the conductive wire 2321 may be cut so as to be positioned on the edge 4111a of the nickel plating portion 51.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the nickel plating part 51 of the connector member 4 may abut on the side wall 2123b (where the insulating film is formed) of the recess 2123 of the base part 21. Further, the first connection terminal 411 may be provided with a notch-shaped portion as an insertion portion into which the end portion of the conducting wire 2321 is inserted instead of the hole portion 4111.

  In the above embodiment, the concave portion 2123 of the base portion 21 may be formed to extend outward in the radial direction from the boundary between the central region 2121 and the peripheral region 2122. That is, the recess 2123 is formed from the center region 2121 to at least the boundary between the center region 2121 and the peripheral region 2122, and at least a part including the first connection terminal 411 of the connector member 4 is disposed in the recess 2123.

  The base portion 21 is not a part of the housing 61 but may be a bracket attached to the housing, for example. The recording disk drive device 60 is not limited to a hard disk drive device, but is an optical disk drive device, a magneto-optical disk drive device, or the like, which is one or both of reading and writing information on a recording disk, that is, another device that performs reading or writing. There may be. The motor 1 may be used as a drive source for devices other than the recording disk drive device.

It is sectional drawing of a recording disk drive device. It is sectional drawing of a motor. It is a bottom view of a base part. It is a bottom view of a connector member. It is a side view of a connector member. It is a bottom view of a connector member. It is a bottom view of a motor. It is sectional drawing of the motor which expands and shows the 1st connection terminal of a connector member. It is a figure which expands and shows a part of base part, a connector member, and a stator. It is a figure which expands and shows a part of base part, a connector member, and a stator. It is a figure which expands and shows a part of base part and a connector member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Stator part 3 Rotor part 4 Connector member 21 Base part 23 Stator 24 Circuit board 41 Wiring part 51 Nickel plating part 52 Gold plating part 60 Recording disk drive device 61 Housing 62 Recording disk 63 Access part 213 Through-hole 2121 Central area 2122 Around Region 2123 Recessed portion 2321 Conductor 4111 Hole portion J1 Central axis

Claims (4)

An electric motor,
A stator portion;
A rotor portion rotatably supported with respect to the stator portion around a central axis;
With
The stator portion is
A stator,
A base portion to which the stator is attached;
A connector member that is attached to the opposite side of the base portion from the stator and has a plurality of wiring portions that connect the stator wires and the circuit board and extend substantially parallel to each other;
With
The base portion is
A central region in which the central axis is located in the center;
A peripheral region located on the stator side of the central region around the central region;
A recess formed in the central region to at least a boundary between the central region and the peripheral region, wherein at least a part of the connector member is disposed;
With
A through-hole penetrating in a direction parallel to the central axis is provided in the recess,
Each of the plurality of wiring portions is
A tip portion that approaches or abuts the side wall of the recess, and a nickel-plated portion that is nickel-plated;
A gold-plated portion subjected to continuous gold-plating from the nickel-plated portion;
With
The gold-plated portion has a hole shape or a notch shape that overlaps with the through hole in a direction parallel to the central axis, and an insertion portion into which an end portion of the conducting wire drawn out from the through hole is inserted;
The motor according to claim 1, wherein the end portion of the conducting wire inserted into the insertion portion is soldered to the gold plating portion in a state toward the central axis. The motor according to claim 1,
The motor according to claim 1, wherein the end portion of the conducting wire and solder for fixing the end portion to the plurality of wiring portions are located in the recess. The motor according to claim 1 or 2,
The motor is characterized in that the end of the end portion of the conducting wire is located between the edge of the nickel plating portion and the side wall or on the edge. A recording disk drive device comprising:
The motor according to any one of claims 1 to 3, which rotates a recording disk;
An access unit for reading or writing information on the recording disk;
A housing for housing the motor and the access unit;
A recording disk drive device comprising:

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