JP3075925U - Motor drive device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a portion for drawing out a power supply lead wire 24 to the outside to be securely sealed with a simple configuration. SOLUTION: A part of a through hole 25 provided in a sealing partition 2 is
The sealing resin B is exposed to the outside through the opening 28a of the outer covering member 28, and is injected into the inner space of the through hole 25 through the injection hole 29 defined in the exposed portion, thereby injecting. The air that was previously in the space inside the through hole 25 is removed from the injection hole portion 29 together with the inflow of the sealing resin B.
From outside, so that the space inside the through hole 25 is almost completely filled and filled with the sealing resin B.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a motor drive device in which a motor is arranged inside a drive device having a sealed partition.

[0002]

[Prior art]

 In general, in a disk drive device such as a disk drive device for rotating and driving various media disks, the entire motor is arranged in an internal space sealed by a partition wall. The side space is always kept clean in order to protect the media disk from dust and the like.

On the other hand, as shown in FIGS. 6 and 7, a power supply lead wire 1 connected to a drive coil of the motor is connected to a drive device of a drive device through a through hole 3 formed through the sealing partition wall 2. An insulating paper (inner coating member) 4 is adhered to the inner surface (upper surface in FIG. 6) of the sealing partition 2 of the drive device, which is drawn out to the outside. 4) The power supply lead wire 1 is inserted into the through hole 3 so as to pass through the coil through hole 4a. A flexible substrate (outer covering member) 5 for signal transmission is attached to the outer surface (lower surface in FIG. 6) of the sealing partition 2, and the flexible substrate 5 is used to cover the outer side of the through hole 3. (FIG. 6, lower side) Although the opening is covered, the power supply lead wire 1 is pulled out to the outside of the drive device so that the coil through hole 5a provided in the flexible substrate 5 is inserted. I have. Further, the power supply lead wire 1 drawn out to the outside is soldered to a land portion 6 formed on the flexible substrate 5.

As described above, when the power supply lead wire 1 is pulled out to the outside, a hole structure that connects the inside and outside spaces of the drive device is required. It is contaminated through the hole structure, and it is necessary to take appropriate sealing measures for the communication hole structure of the power supply lead wire 1 described above. Conventionally, for example, a UV-curable sealing resin 7 is injected from the outside into the space inside the through-hole 3 from which the power supply lead wire 1 is pulled out. The sealing resin 7 attempts to prevent air leak from the through hole 3.

[0005]

[Problems to be solved by the invention]

 However, as shown in FIG. 6 described above, the state in which the sealing resin 7 is completely filled in the through hole 3 is merely an ideal state. The current situation is that leakage is likely to occur, and the air leak contaminates the inside of the drive device, which is one of the factors that impairs the reliability of the motor drive device.

That is, when filling the sealing resin 7 into the through hole 3, first, as shown in FIGS. 8, 9 and 10, first, the outer side surface of the motor drive device is turned upward. The sealing resin 7 is injected into the through hole 3 through the coil through hole 5a of the flexible substrate 5 arranged on the upper surface side. However, in the case shown in FIG. 8, the sealing resin 7 injected into the through hole 3 does not completely reach the insulating paper (inner coating member) 4 on the lower side, and in this case, In addition, a gap is formed on one side of the internal space of the through hole 3, and an air leak occurs through the gap.

Similarly, in the case of FIG. 9, before the sealing resin 7 injected into the space inside the through hole 3 is completely filled, the wire through hole 4 a of the insulating paper (inner coating member) 4 is formed. Therefore, a gap is formed on one side of the internal space of the through hole 3 because the hole 3 is closed. Further, in the case of FIG. 10, the sealing resin 7 is adhered to the flexible substrate (outer covering member) 5 side, so that no injection is performed into the space inside the through hole 3 at all. . In each of these cases, air leaks occur through the gaps in the through holes 3, and as a result, the internal space of the drive device is contaminated.

Therefore, an object of the present invention is to provide a motor drive device capable of reliably sealing a portion for drawing out a power supply lead wire to the outside with a simple configuration.

[0009]

[Means for Solving the Problems]

 To achieve the above object, in the motor drive device according to the present invention, a motor is hermetically disposed inside the drive device partitioned by a sealing partition, and a power supply lead connected to a drive coil of the motor. The wire is drawn out to the outside of the drive device through a through hole formed in the sealing partition of the drive device, and the inner and outer surfaces of the seal partition of the drive device are connected to the power supply device. A motor drive device, wherein an inner covering member and an outer covering member respectively covering both the inner and outer openings of the through hole while allowing a lead wire to pass therethrough are arranged so as to be in close contact with the inner and outer surfaces of the sealing partition, respectively. The inner covering member is provided so as to cover the entire inner opening of the through hole, and the outer covering member includes the transparent member. An opening for exposing a part of the outer opening of the through hole including a part of a peripheral edge defining the outer opening of the through hole toward the outside, and the opening of the outer covering member; The other part of the outer opening of the through hole is hermetically covered by the covering part constituting the other part, and the periphery of the through hole exposed to the outside by the opening of the outer covering member. A part of the opening and the periphery of the open part of the outer covering member define an injection hole that communicates the inner space of the through hole to the outside, and the injection hole is formed through the injection hole. The space inside the hole is filled with a sealing resin, and the entire space inside the hole is filled with the sealing resin.

[0010] In the motor drive device according to the invention of claim 2, the sealing resin according to claim 1 is filled from the outside of the drive device along the inner wall surface of the through hole. ing.

Further, in the motor drive device according to the invention of claim 3, the opening provided in the outer covering member according to claim 1 is the power supply of the entire periphery of the opening edge of the through hole. It is provided so that portions other than the portion corresponding to the direction in which the lead wire is drawn out are exposed to the outside.

Further, in the motor drive device according to the invention of claim 4, the opening provided in the outer covering member according to claim 1 is formed by cutting out a part of the outer covering member. I have.

[0013] On the other hand, in the motor drive device according to the invention of claim 5, the inner covering member according to claim 1 is provided with a wire through-hole through which a power supply lead wire is inserted. Are formed so as to have an opening area smaller than each opening area of the through hole and the injection hole.

Further, in the motor drive device according to the invention of claim 6, the motor of claim 1 is a disk drive motor for rotatingly driving a media disk, and the inner covering member is made of an insulating material. And the outer covering member is a flexible substrate for signal transmission.

Furthermore, in the motor drive device according to the invention of claim 7, the flexible board for signal transmission according to claim 6 is provided with a land portion to which a power supply lead wire is soldered, and the through hole is provided. The open portion of the outer covering member is provided so that a portion other than the portion facing the land portion in the entire circumference of the opening edge portion is exposed outward.

In the motor drive device according to the first aspect of the present invention having such a configuration, a part of the through hole provided in the sealing partition wall is formed on the outer side through the opening of the outer covering member. If the sealing resin is injected into the internal space of the through-hole through an injection hole defined in the exposed portion, if the sealing resin is injected into the internal space of the through-hole before injection. The air which has escaped from the injection hole with the inflow of the sealing resin almost disappears due to the residual phenomenon of air bubbles. The side space is completely filled with the sealing resin. As a result, air leakage from the drive device is almost completely prevented by the sealing resin.

At this time, when the sealing resin is injected along the inner wall of the through hole, as in the motor drive device according to the invention of claim 2, the sealing resin with respect to the inside space of the through hole is formed. Is more smoothly carried out.

At this time, like the motor drive device according to the third or seventh aspect of the present invention, the opening portion of the outer covering member is provided so as to correspond to a portion other than the direction in which the power supply lead wire is pulled out. By doing so, the injection of the sealing resin is smoothly performed without being disturbed by the power supply lead wires. In addition, since the through-hole is covered by the covering portion of the outer covering member at the lead-out portion of the power supply lead wire, the power supply lead wire is driven while contacting the peripheral portion of the covering portion of the outer covering member. As a result, the power supply lead wire is prevented from coming into contact with the sealing partition of the drive device, and a short-circuit phenomenon between the power supply lead wire and the drive device sealing partition is prevented. It is surely avoided.

At this time, if the opening is formed by cutting out a part of the outer covering member as in the motor drive device according to the invention of claim 4, the operation of forming the opening can be performed. Is done easily and accurately.

Further, as in the motor drive device according to the present invention, the wire through hole provided in the inner covering member is formed so as to have an outer shape smaller than the through hole and the injection hole. For example, the amount of the sealing resin flowing out of the wire through hole is reduced, and the amount of the sealing resin used is reduced. Also, even if the power supply lead wire after inserting the wire through hole of the inner covering member is deformed into a curled state, the power supply lead wire can easily move outward through the relatively large injection hole. It is to be withdrawn.

Furthermore, when the present invention is applied to a disk drive motor for which cleanliness in a drive device is particularly required, as in the motor drive device according to the present invention, The functions described above can be obtained very well.

[0022]

[Embodiment of the invention]

 Hereinafter, an embodiment in which the present invention is applied to a hard disk drive (HDD) will be described. First, the overall structure of the hard disk drive (HDD) will be described with reference to the drawings.

The entire shaft-fixed HDD spindle motor shown in FIG. 5 includes a stator set 20 as a fixing member, and a rotor set as a rotating member assembled to the stator set 20 from above in the figure. 30, the entire spindle motor for HDD is disposed in a space on the inner side (upper side in the figure) of a sealed partition wall partially including a fixed frame 21 constituting the stator set 20. Have been.

That is, the stator set 20 has a fixed frame 21 made of an aluminum-based metal or the like which is screwed to a fixed base (not shown), and a disk constituting the fixed frame 21. By fixing the portion 21a to the drive device side (not shown), the entire motor is mounted in a highly accurate and airtight manner.

A fixed shaft 22 is fixed to a substantially central portion of the fixed frame 21 so as to stand upright, and a hollow cylindrical core that concentrically surrounds the outer peripheral side of the fixed shaft 22. A holder 21b is provided integrally with the fixed frame 21. A stator core 23 made of a laminated body of electromagnetic steel sheets is fitted on the outer peripheral side wall surface of the core holder 21b. The stator core 23 is axially positioned by being axially abutted against a core abutting portion formed so as to depress a part of the outer peripheral side wall surface of the core holder 21b. A drive coil 24 is wound around each of the plurality of salient pole portions provided on the stator core 23.

A power supply lead wire 24a is connected to the drive coil 24 so as to extend to the outside. The power supply lead wire 24a is a part of the sealing partition of the drive device described above. Are drawn out to the outside of the drive device so as to pass through the through-hole 25 formed through the fixed frame 21 constituting the drive device. This point will be described later.

The fixed shaft 22 is formed of stainless steel, and a pair of ball bearings 26 are attached to the outer peripheral side of the fixed shaft 22 along the axial direction. A rotary hub 31 constituting the rotor set 30 is rotatably supported via ball bearings 26, 26. The rotating hub 31 is formed of a substantially cup-shaped member made of an aluminum-based metal or an iron-based metal so that a recording medium media disk such as a magnetic disk (not shown) is mounted on the rotating hub 31. Has a substantially cylindrical body 31a for mounting a recording medium media disk on the outer periphery thereof, and has a disk mounting surface 31b provided so as to project radially outward from the body 31a. A recording medium (not shown) and a media disk are mounted thereon.

An annular drive magnet 31 c is circumferentially attached to the inner peripheral wall surface of the body 31 a of the rotary hub 31, and the annular drive magnet 31 c is attached to each salient pole of the stator core 23 described above. Are disposed so as to be annularly opposed to the outer peripheral side end face.

On the other hand, as described above, the power supply lead wire 24 a connected to the drive coil 24 is drawn out to the outside of the drive device so as to pass through the through-hole 25 formed through the fixed frame 21. In particular, as shown in FIGS. 1 and 2, the inner surface (the upper surface in FIG. 1) of the fixed frame 21 is provided with the power supply lead wire 24a and the through hole 25. An insulating paper (inner covering member) 27 made of a film-like double-sided tape covering the inner opening of the first member is adhered in a close contact state. A flexible substrate (outer covering member) 28 that covers the outer opening of the through hole 25 while the power supply lead wire 24a is inserted is in close contact with the outer surface (the lower surface in the figure) of the fixed frame 21. Are arranged as follows.

The insulating paper (inner covering member) 27 is provided so as to cover the entire surface of the inner opening of the through hole 25, and a portion covering the inner opening of the through hole 25 is provided. A wire through hole 27a is provided at a substantially central portion, and the power supply lead wire 24a is inserted into the inside space of the through hole 25 through the wire through hole 27a. Further, the power supply lead wire 24a inserted into the internal space of the through hole 25 passes through the open portion 28a formed by cutting out the flexible substrate (outer covering member) 28 to the outside (lower side in FIG. 1). Has been drawn to. The leading end of the lead portion of the power supply lead wire 24a is soldered to the land 28b of the flexible substrate 28.

At this time, the flexible substrate (outer covering member) 28 extends in a narrow band shape from the tip end near the through hole 25 toward the land portion 28b, and further passes through the land portion 28b. The above-mentioned open portion 28a is disposed at a portion on the distal end side of the flexible substrate (outer covering member) 28. In other words, the open portion 28a has an elongated hole shape that is disposed on the opposite side of the land portion 28b with respect to the through hole 25, and is formed of the flexible substrate (outer coating member). 28 is cut out in a substantially U-shape from the edge on the tip side toward the through hole 25 side. A part of the outer opening of the through hole 25 is exposed to the outside (the lower side in FIG. 1) by the cutout portion of the elongated opening 28a. A part of the entire periphery defining the outer opening of the through hole 25, that is, an arc-shaped periphery 25a located on the opposite side to the land 28b is exposed to the outside. Have been.

At this time, the closed side portion of the open portion 28a in the flexible substrate (outer covering member) 28 is formed as a substantially semicircular edge portion 28c, and the diameter of the semicircular edge portion 28c is The diameter is set to be smaller than the diameter of the through hole 25. The semicircular edge portion 28c of the open portion 28a is arranged in the inner region of the opening of the through hole 25. Due to such an arrangement relation, the opening of the flexible substrate (outer covering member) 28 is performed. The covering portion 28d, which is a portion other than the portion 28a, hermetically closes the portion of the through hole 25 except the opening 28a, and the semicircular edge 28b on the closing side of the opening 28a. An injection hole portion 29 having a long hole shape is defined between the hole and the arc-shaped peripheral edge portion 25a exposed to the outside of the through hole 25. Then, a sealing resin B described later is filled into the space inside the through hole 25 through the injection hole portion 29.

At this time, the diameter of the wire through-hole 27 a (see FIG. 1) provided in the above-mentioned insulating paper (inner coating member) 27 is formed so as to have a size considerably smaller than the diameter of the through-hole 25. In addition, the diameter of the injection hole 29 is smaller than the diameter of the closed semicircular edge 28c.

On the other hand, as described above, for example, a UV-curable sealing resin B is supplied from the outside (the lower side in FIG. 1) of the drive device to the inside of the internal space of the through hole 25 through the injection hole 29. Is filled. In actually injecting the sealing resin B, the injection hole 29 is turned upside down so that the injection hole 29 faces upward, and the inner wall surface of the through hole 25 defining the injection hole 29 is formed. The injection of the sealing resin B is performed along the direction. By such an injection, the air that was in the space inside the through hole 25 before the injection of the sealing resin B flows out of the injection hole 29 with the inflow of the sealing resin B. In addition, the phenomenon of residual bubbles hardly occurs. That is, the sealing resin B is completely filled and filled in the space inside the through hole 25 so that the sealing resin B to be injected and the air are exchanged.

As described above, in this embodiment, the inside of the through-hole 25 is almost completely filled with the sealing resin B injected into the space inside the through-hole 25 through the injection hole 29. Thus, air leaks from the drive device are almost completely prevented, and the cleanliness inside the drive device is well maintained.

At this time, particularly in the present embodiment, the sealing resin B is injected along the inner wall surface of the through hole 25, so that the inflow of the sealing resin B into the space inside the through hole 25 is extremely small. So that it is performed smoothly.

In the present embodiment, since the open portion 28a of the flexible substrate (outer covering member) 28 is provided so as to correspond to a portion other than the direction in which the power supply lead wire 24a is pulled out, the sealing resin The injection of B is performed smoothly without being disturbed by the power supply lead wire 24a.

In this embodiment, the open portion 28a of the flexible substrate (outer covering member) 28 is provided at a position completely opposite to the land portion 28b from which the power supply lead wire 24a is drawn out. However, the present invention is not limited to this, and as described above, the power supply lead wire 24a may be provided at another position as long as the position corresponds to a portion other than the direction in which the lead wire 24a is pulled out.

In addition, since the through-hole 25 is covered by the covering portion 28 d of the flexible substrate (outer covering member) 28 in the lead-out portion of the power supply lead wire 24 a in the present embodiment, the power supply lead wire 24 a The flexible substrate (outer covering member) 28 is drawn out to the outside of the drive device while being in contact with the closed semicircular edge portion 28c. Accordingly, the power supply lead wire 24a is prevented from contacting the sealing partition 21 of the drive device, and the short circuit phenomenon between the power supply lead wire 24a and the drive device sealing partition 21 is reliably avoided. It has become.

Further, in the present embodiment, since the open portion 28a is formed so as to cut out a part of the flexible substrate (outer covering member) 28, the forming operation of the open portion 28a is easy and accurate. Is to be performed. This is because the flexible substrate (outer covering member) 28 has an outer shape formed by using a die having a predetermined shape.

Further, in the present embodiment, the wire through-hole 27 a provided in the insulating paper (inner covering member) 27 is formed so as to have an outer shape smaller than the through-hole 25 and the injection hole 29. In addition, the amount of the sealing resin B flowing out from the wire through hole 27a is reduced, and the amount of the sealing resin B used is reduced. As described above, if the amount of the sealing resin B used is reduced, the outgas generated from the sealing resin B is also reduced, and the possibility of contamination of the drive device by the outgas is reduced.

Since the power supply lead wire 24a is formed of a thin wire of, for example, about 0.1 mm, the power supply lead wire 24a is easily deformed into a curled state. Although there is no problem in inserting the wire through hole 27a provided in the wire 27, it becomes difficult to pass the inserted power supply lead wire 24a through the wire through hole of the flexible substrate (outer cover member) 28. There is. On the other hand, in the above-described embodiment of the present invention, since the power supply lead wire 24a is drawn out through the injection hole 29 having a relatively large shape, the power supply lead wire 24a is deformed into a curled state. Even if they do, they can be easily pulled out.

Each of the above-described functions can be obtained very well when the present invention is applied to a disk drive motor in which cleanliness in the drive device is particularly required as in the present embodiment.

On the other hand, in the embodiment according to FIGS. 3 and 4 in which the same reference numerals are given to the configuration corresponding to the above-described embodiment, the open portion 28 a provided in the flexible substrate (outer covering member) 28 It is formed as a long hole extending along the longitudinal direction of the substrate (outer covering member) 28, and is formed on the land portion 28b side of the two closed side portions in the extending direction of the open portion 28a. The semicircular edge 28c is the same as in the above-described embodiment.

On the other hand, the semicircular edge 28 e on the side opposite to the semicircular edge 28 c on the land 28 b side is located at the center of the semicircular edge 28 e. It is arranged so as to substantially coincide with the portion 25a. In such an embodiment, substantially the same operation and effect as in the above-described embodiment can be obtained.

As described above, the embodiment of the invention made by the present inventors has been specifically described. However, the present invention is not limited to the above embodiment, and can be variously modified without departing from the gist of the invention. Needless to say.

For example, in each of the embodiments described above, the present invention is applied to a hard disk drive. However, the present invention is not limited to this, and a disk used in various other various devices is used. The present invention can be similarly applied to a drive device including a device and other various motors.

[0048]

[Effect of the invention]

 As described above, in the motor drive device according to the invention of claim 1, a part of the through hole provided in the sealing partition is exposed to the outside through the opening of the outer covering member, and the exposed portion is formed in the exposed portion. By injecting the sealing resin into the inner space of the through hole through the defined injection hole, the air that was in the inner space of the through hole before the injection is injected together with the inflow of the sealing resin. The sealing resin is almost completely filled and filled in the space inside the through hole by being pulled out from the hole, so that the sealing resin causes air leakage from the drive device. Can be almost completely prevented, and the part where the lead wire for power supply is drawn out can be reliably sealed with a simple configuration, and the cleanliness of the motor drive device can be ensured. Improving reliability Can.

In the motor drive device according to the second aspect of the present invention, by injecting the sealing resin along the inner wall of the through hole, the inflow of the sealing resin into the space inside the through hole is achieved. Since the operation is further smoothed, the above-described effects can be further enhanced.

Further, in the motor drive device according to the third or seventh aspect of the present invention, the opening portion of the outer covering member is provided so as to correspond to a portion other than the direction in which the power supply lead wire is pulled out. In addition to facilitating the injection of the sealing resin, the power supply lead wire is prevented from contacting the sealing partition of the drive device, and the short-circuit phenomenon between the power supply lead wire and the drive device sealing partition is avoided. Therefore, it is possible to secure the electrical stability while further improving the effects described above.

Further, the motor drive device according to the invention of claim 4 is such that the opening portion is formed by cutting out a part of the outer covering member so that the operation of forming the opening portion is easy and accurate. Therefore, productivity can be improved in addition to the effects described above.

According to a fifth aspect of the present invention, there is provided the motor drive device, wherein the wire through-hole provided in the inner covering member is formed so as to have an outer shape smaller than the through-hole and the injection hole. In addition to reducing the amount of use, the operation of pulling out the power supply lead wire is facilitated, so that the productivity can be improved in addition to the effects described above.

Further, the motor drive device according to the invention of claim 6 applies the present invention to a disk drive motor that requires particularly high cleanliness in the drive device. The effect can be obtained very well.

[Brief description of the drawings]

FIG. 1 is an enlarged side view illustrating an embodiment of a lead-out portion of a power supply lead wire in a motor drive device to which the present invention is applied.

FIG. 2 is an explanatory bottom view further illustrating a lead-out portion of a power supply lead wire shown in FIG. 1;

FIG. 3 is an enlarged side view illustrating another embodiment of a lead-out portion of a power supply lead wire in a motor drive device to which the present invention is applied.

FIG. 4 is an explanatory bottom view further illustrating a lead-out portion of a power supply lead wire shown in FIG. 3;

FIG. 5 is a longitudinal sectional view showing a hard disk drive (HDD) as an example of a device to which the motor drive device according to the present invention is applied.

FIG. 6 is an enlarged side view illustrating an example of a lead-out portion of a power supply lead wire in a conventional motor drive device.

7 is an explanatory bottom view further illustrating a lead-out portion of the conventional power supply lead wire shown in FIG. 6;

FIG. 8 is an enlarged explanatory side view showing an example of a failure state of a drawn portion of a power supply lead wire in a conventional motor drive device.

FIG. 9 is an enlarged explanatory side view showing another example of a failure state of a lead portion of a power supply lead wire in a conventional motor drive device.

FIG. 10 is an enlarged side explanatory view showing still another example of a failure state of a draw-out portion of a power supply lead wire in a conventional motor drive device.

[Explanation of symbols]

 Reference Signs List 20 Stator set 21 Fixed frame (sealed partition) 23 Stator core 24 Drive coil 24a Lead wire for power supply 25 Through hole 25a Arc-shaped peripheral edge 27 Insulating paper (inner coating member) 27a Wire through hole 28 Flexible substrate (outer coating member) 28a Open portion 28b Land portion 28c Semicircular edge 28d Covering portion 28e Semicircular edge 29 Injection hole B Sealing resin 30 Rotor set

Claims (7)

[Utility model registration claims] A motor is hermetically disposed inside a drive device partitioned by a sealing partition, and a power supply lead wire connected to a driving coil of the motor is formed through the sealing partition of the drive device. The drive device is drawn out to the outside of the drive device through the through-hole. Both the inner and outer surfaces of the sealing partition of the drive device are inserted into the inner and outer openings of the through-hole while allowing the power supply lead wire to pass therethrough. Wherein the inner covering member and the outer covering member respectively covering the inner and outer surfaces of the sealing partition wall are arranged so as to be in close contact with both the inner and outer surfaces of the sealing partition wall. And the outer covering member includes an outer opening of the through hole including a part of a peripheral edge defining an outer opening of the through hole. An opening for exposing a part of the portion toward the outside is provided, and another part of the outer opening of the through hole is sealed by a covering part constituting a part other than the opening of the outer covering member. A part of the periphery of the through-hole which is covered in a shape and is exposed to the outside by the opening of the outer covering member, and the periphery of the opening of the outer covering member, the inner side of the through-hole. An injection hole for communicating the space to the outside is defined, and a sealing resin is filled in the internal space of the through-hole through the injection hole, and the entire internal space of the through-hole is filled with the sealing resin. Is satisfied. 2. The motor drive device according to claim 1, wherein the sealing resin is filled from the outside of the drive device along the inner wall surface of the through hole. 3. The open portion provided in the outer covering member is configured to extend a portion of the entire periphery of the opening edge of the through hole other than a portion corresponding to a direction in which the power supply lead wire is pulled out. 2. The motor drive device according to claim 1, wherein the motor drive device is provided so as to be exposed to the motor. 4. The motor drive device according to claim 1, wherein the open portion provided in the outer cover member has a shape in which a part of the outer cover member is cut out. 5. The inner cover member has a wire through hole through which a power supply lead wire is inserted, and the wire through hole has an opening area smaller than each opening area of the through hole and the injection hole. The motor drive device according to claim 1, wherein the motor drive device is formed as follows. 6. The motor according to claim 1, wherein the motor is a disk drive motor that drives a media disk to rotate, the inner coating member is made of an insulating film-like member, and the outer coating member is a signal transmission flexible member. 2. The motor drive device according to claim 1, wherein the motor drive device comprises a substrate. 7. A land portion to which a power supply lead wire is soldered is provided on the flexible substrate for signal transmission, and a portion of the entire periphery of an opening edge of the through hole other than a portion facing the land portion side. 7. The motor drive device according to claim 6, wherein an opening of the outer covering member is provided so as to expose the portion to the outside.