JPH0291872A - Rotary storage device and motor - Google Patents

Abstract

PURPOSE:To miniaturize the title device and to reduce the adverse thermal influence of the device to a material to be loaded by providing a heat insulating member of a high polymeric organic material between a stator fixed to a box body and the box body and a recessed section to one of the contacting surfaces of the box body and stator. CONSTITUTION:A motor 6 which drives a rotating shaft 2 for rotating a rotary recording medium is constituted of a rotor 6c coaxially fixed to the shaft 2 by means of a fixing screw 6a and fixing piece 6b, winding 6e surrounding the rotor 6c, and stator 6f fixed to the wall 1b of a box body 1 with a fitting screw 7. A protruding rib 6g is provided to the surface of the stator 6f to be fitted to the box body 1 so as to surround the winding 6e and a chamfering process is performed on the rib 6g. A heat insulating material 9 of a high polymeric organic material having a low heat transfer rate is put between the stator 6f and box body 1. In addition, an insertion guide hole 8 is provided in the stator mounting section of the box body 1 and the rib 6g is put in the hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary storage device and an electric motor, and in particular,
The present invention relates to a magnetic disk device that enables high-density recording by preventing deterioration in head positioning accuracy due to heat generation of an electric motor that drives a storage medium, and the structure of the electric motor used therein.

[Conventional technology]

For example, as magnetic disk drives, which are a type of rotary storage device, become more sophisticated and smaller, a direct drive system is adopted in which an electric motor that drives a rotating shaft that coaxially connects multiple magnetic disks is directly connected to the rotating shaft. has come into use.

In other words, the rotor of the electric motor is directly connected to one end of the rotating shaft of the magnetic disk, and the stator is directly fixed to a housing that houses the magnetic disk, the head, and an actuator that positions the head with respect to the magnetic disk. This is what I did.

Further, in this case, from the viewpoint of rigidity, vibration, etc., it is common to adopt a double-supported structure in which both ends of the rotating shaft of the magnetic disk are supported by the casing.

By the way, in such a direct drive type magnetic disk device, the temperature inside the casing on the side closer to the electric motor becomes higher than the other part due to the heat generated from the electric motor during operation, so the temperature of the magnetic disk on the side closer to the electric motor increases. Thermal expansion is larger than that of other magnetic disks, and there is a concern that there may be a positioning error (off-track) of the head with respect to tracks provided concentrically on the magnetic disk as a memory area.

For this reason, for example, as described in Japanese Unexamined Patent Publication No. 62-222482, by making the distance between the housing wall on the motor side and the magnetic disk larger than on the side where the motor is not installed, It is known to equalize the thermal influence of an operating electric motor on a plurality of magnetic disks coaxially fixed in the direction to avoid off-track occurrence.

[Problem to be solved by the invention]

However, although the above-mentioned conventional technology achieves a certain effect in making the temperature distribution uniform among the plurality of magnetic disks within the housing, there is a problem that the external dimensions of the housing become larger than necessary, and furthermore, the electric motor The heat generated by the rotating shaft causes a temperature difference in each part of the heavy body that supports both ends of the rotating shaft, and the thermal expansion difference caused by this temperature difference causes
No consideration was given to the problem that the rotating shaft, which is supported at both ends by the housing, is tilted and off-track occurs.

In other words, in recent years, in response to demands for miniaturization and further increases in recording density in magnetic disk drives, the spacing between concentric tracks on magnetic disks has become narrower and narrower, with an off-line distance of about 1 μm. The amount of trucks is also becoming a problem.

For example, in a normal magnetic disk drive, the carriage carrying the head moves in the radial direction of the magnetic disk on a guide mechanism provided at the end of the housing. The length of the casing from the center of both ends of the rotating shaft that supports the magnetic disk to the connecting end of the guide mechanism.

and L2, the moving direction of the head and the plane of the magnetic disk must always be equal in order to maintain their parallelism.

Immediately after the start of operation, heat from the stator is not transferred to the casing, so Ll and L2 are equal. Assuming that the length at this time is L, as the operating time passes, the heat of the stator is transmitted to the casing on the side that the stator is in close contact with, and a temperature difference ΔT occurs in each part of the casing that supports both ends of the rotating shaft. , L, and L2, a dimensional difference ΔL occurs.

The casing is usually made of aluminum alloy, and the coefficient of linear thermal expansion α = 0.23 x 10-'/'t: In the example of the conventional device, L = about 120 + nm, so ΔT =
If the temperature is 1°C, a dimensional difference of ΔL=L ・Cl ・ΔT = 2.8 t, t m will occur.

Normally, the servo magnetic disk and servo head, which serve as the reference for positioning, are installed at the center of a rotating shaft that connects multiple magnetic disks. ΔL/2=1.
An off-track amount of about 4 μm occurs.

As described above, as high-density recording progresses, a temperature difference between the casings supporting both ends of the rotating shaft due to the heat of the stator becomes a problem, but this problem was not recognized in the prior art.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary storage device that makes it possible to improve the recording density of a rotary storage medium by reducing the temperature difference between the casing and the inside of the casing due to heat generated by an electric motor. It's about doing.

Another object of the present invention is to provide a rotary storage device that can be miniaturized.

Still another object of the present invention is to provide an electric motor capable of reducing adverse thermal effects on an object to be mounted.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

A brief overview of typical inventions disclosed in this application is as follows.

That is, the rotating storage device of the present invention according to claim 1 has the following features:
A rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which this rotary storage medium is housed, a head that performs an operation of recording and reproducing information on the rotary storage medium, and a rotary storage medium of this head. It is a rotary storage device that is equipped with a drive mechanism that operates, and an electric motor that drives the rotating shaft, which is made up of a rotor fixed to a rotating shaft and a stator fixed to a cylinder. A heat insulating member is interposed on the contact surface with the body.

The rotary storage device of the present invention according to claim 3 further includes a rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which the rotary storage medium is housed, and information on the rotary storage medium. A head that performs recording/reproducing operations, a drive mechanism that positions this head with respect to a rotary storage medium, and
A rotary storage device comprising a rotor fixed to a rotating shaft and a stator fixed to a housing, and an electric motor for driving the rotating shaft, wherein a recess is carved in the contact surface of at least one of the housing and the stator. It was established.

The rotary storage device of the present invention according to claim 4 further includes a rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which the rotary storage medium is housed, and information on the rotary storage medium. A head that performs recording/reproducing operations, a drive mechanism that positions this head with respect to a rotary storage medium, and
A rotary storage device consisting of a rotor fixed to a rotating shaft and a stator fixed to a housing, and an electric motor driving the rotating shaft, with the electric motors disposed at each end of the rotating shaft. be.

Further, in the electric motor of the present invention as set forth in claim 5, the mounting surface of the stator is constructed of a heat insulating member.

Further, in the electric motor of the present invention as set forth in claim 6, a recess is carved in the mounting surface of the stator.

[Effect]

According to the above-mentioned rotary storage device of the present invention as set forth in claim 1, since the transfer of heat from the stator of the electric motor to the casing is prevented by the heat insulating member, the casing and the inside of the casing, This avoids creating a temperature difference with other parts.

As a result, the amount of off-track caused by, for example, the inclination of the rotation axis caused by differences in thermal expansion of each part of the casing is reduced, making it possible to further narrow the track spacing, making it possible to Recording density can be improved.

Furthermore, for the purpose of preventing uneven temperature distribution within the housing due to heat generation from the electric motor installed at one end of the rotating shaft, for example, the wall surface of the housing on the side where the electric motor is attached,
There is no need to make the space between the rotary A6 storage medium housed inside the casing larger than that on the opposite side, and the rotary storage device can be downsized.

Further, according to the rotary storage device according to claim 3, since the substantial contact area between the stator and the casing, that is, the heat transfer area, is reduced, the electric motor The amount of heat transmitted from the motor to the casing side can be reduced, and a temperature difference between the vicinity of the electric motor and other parts in the casing and inside the casing can be avoided.

This reduces the amount of off-track caused by heat generation from the electric motor, making it possible to further narrow the track spacing, thereby improving the recording density of the rotary storage medium.

Furthermore, for the purpose of preventing uneven temperature distribution within the housing due to heat generation from the electric motor installed at one end of the rotating shaft, for example, the wall surface of the housing on the side where the electric motor is attached,
There is no need to make the distance between the rotary storage medium housed inside the casing larger than that on the opposite side, and the rotary storage device can be made smaller.

Further, according to the rotary storage device according to claim 4, thermal adverse effects caused by heat generation from each of the electric motors at the portions that support both ends of the rotating shaft of the casing are offset, and The amount of off-track caused by this decreases, and the recording density of the rotary storage medium can be improved.

Further, according to the electric motor according to claim 5, the heat insulating member can prevent the transfer of heat to the object to be attached via the stator, and local thermal expansion of the part of the object to which the motor is attached can be prevented. It is possible to reduce the adverse thermal effects caused by

Further, according to the electric motor according to claim 6, since the heat transfer area between the stator and the mounted object is reduced, the heat transferred to the mounted object via the stator is reduced, and the electric motor in the mounted object is reduced. It is possible to reduce adverse thermal effects caused by local thermal expansion of the attachment site.

[Embodiment 1] FIG. 1 is a sectional view showing a main part of a rotary storage device according to an embodiment of the present invention, and FIG. 5 is a schematic sectional view showing an example of its overall configuration.

In this embodiment, a case of a magnetic disk device, which is a type of rotary storage device, will be explained.

That is, as shown in FIG. 5, a plurality of magnetic disks 3 fixed coaxially and parallel to the rotating shaft 2 are housed inside the housing 1, and both ends of the rotating shaft 2 are ,
It is rotatably supported by mutually opposing wall surfaces 1a and 1b of the housing 1 via bearings 4 and 5, respectively.

On the wall surface 1b of the casing 1 on which one end of the rotating shaft 2 is supported, an electric motor 6 that drives the rotating shaft 2 is provided with a plurality of mounting screws 7.
Fixed by

That is, as shown in FIG. 1, the electric motor 6 that drives the rotating shaft 2 includes a rotor 6C that is coaxially fixed to the rotating shaft 2 via a fixing screw 6a and a fixing piece 6b, and a rotor 6C that is fixed to a predetermined position. A winding 6e is arranged so as to form a gap 6d surrounding the rotor 6C, and forms a rotating magnetic field to generate torque in the rotor 6C. The stator 6f is fixed to the stator 6f.

A rib 6g is provided on the contact surface side of the stator 6f with respect to the housing 1 so as to surround the winding 6e.
The outer periphery of the tip end of the rib 6g is chamfered as shown.

Then, during assembly, by fitting this rib 6g into the wall surface 1b of the housing 1 with a predetermined minute fitting allowance into the insertion guide hole 8 formed in the rotating shaft 2 and the moving shaft,
A radial gap 6d between the rotor 6C rotating together with the rotating shaft 2 and the winding 6e is ensured uniformly over the entire circumference, and damage caused by contact between the winding 6e and the rotor 6C is prevented when the stator 6f is attached or removed. It is configured to

In this case, between the stator 6f and the housing 1, for example, a polymeric organic material with low thermal conductivity (thermal conductivity: 0.1
~0.3kca 17m, h, t: approximately), etc., and is formed into a shape that follows the contact surface between the stator 6f, the housing 1, the rib 6g, and the insertion guide hole 8.
is interposed to prevent heat generated as the electric motor 6 operates from being transmitted from the stator 6f and the ribs 6g to the housing 1 side.

That is, the stator 6f of the electric motor 6 is usually made of metal such as aluminum alloy, and its thermal conductivity is 17
The thermal conductivity of the heat insulating member 9 of this embodiment is 0.1 to 0.3 as described above.
Since a high-molecular organic material having a kca of 17m, h is used, the transfer of heat from the stator 6f to the housing 1 can be effectively prevented compared to the case where the stator 6f is simply brought into close contact with the housing 1. Can be done.

On the other hand, a plurality of magnetic disks 3 housed inside the housing 1
A pair of guide rails 10 fixed to the housing 1 in a posture parallel to the recording surface 3a of the magnetic disk 3 are provided on the side portions of the magnetic disk 3.

A carriage 12 is slidably held on the guide rail 10 via a bearing 11, and a voice coil motor 13 provided on the back side drives a magnetic disk 3.
It is configured to be reciprocated in the radial direction.

A plurality of arms 14 whose tips extend parallel to the plurality of magnetic disks 3 are fixed to the carriage 12 .

A plurality of arms 14 located between a plurality of magnetic disks 3
A plurality of heads 16 are fixed to the tip of each of the disks via leaf springs 15, and each head 16 is attached to each of the recording surfaces 3a of the plurality of magnetic disks 3 at a predetermined gap. They are facing each other.

Then, by positioning the head 16 at an arbitrary position in the radial direction of the magnetic disk 3 by displacement of the carriage 12, among a plurality of tracks (not shown) provided concentrically on each recording surface 3a of the magnetic disk 3, A seek operation is performed to simultaneously position a plurality of heads 16 on each of an arbitrary set of tracks located at the same distance from the center of rotation, and the heads 16 perform information recording/reproducing operations on the tracks. .

Further, among the plurality of magnetic disks 3 fixed in an attitude parallel to the rotational axis 2 in the axial direction, the recording surface 3b of the magnetic disk 3 located in the center is used for controlling the seek operation of the plurality of heads 16. A servo track, which is control information, is recorded, and a head facing this recording surface is configured to function as a servo head 16a for reading the servo track.

The operation of this embodiment will be explained below.

First, in the stopped state where the electric motor 6 that drives the rotating shaft 2 of the magnetic disk 3 is stopped, the temperature of each part of the housing 1 is equal, and at this time, both ends of the rotating shaft 2 supported by the housing 1 are The mounting of the guide rail 10 of each carriage 12 is set so that the distances L1 and L2 to the ends thereof are equal.

That is, the displacement direction of the carriage 12 (head 16) is set to be parallel to the recording surfaces 3a and 3b of the magnetic disk 3, and in a seek operation, the servo head 16a located at the center of the plurality of heads 16 is When positioned on the target servo track, all of the other heads 16 simultaneously accurately position each of the target tracks equidistant from the center of rotation provided on each recording surface 3a of the magnetic disk 3. It has been adjusted to be positioned in

In this state, when the electric motor 6 is started to rotate the magnetic disk 3 and the operation of the magnetic disk device is started, the electric motor 6
generates heat by energizing the winding 60, etc., and a portion of this heat attempts to move via the stator 6f to the wall surface 1b of the casing 1 to which the stator 6F is fixed.

Here, as mentioned above, conventionally, the stator 6r and the housing 1 are in direct contact with each other, so the heat generated from the electric motor 6 is easily transferred to the housing 1, and the stator 6f It is inevitable that the temperature of the wall surface 1b of the housing 1 to which the electric motor 6 is fixed becomes higher than that of the opposite wall surface 1a to which the electric motor 6 is connected.
Due to thermal expansion on the side, the distance m L 2 from the center of the rotating shaft 2 on the side of the wall surface 1b to the mounting surface of the guide rail 10 is
However, the mounting distance of the guide rail 10 from the center of the rotating shaft 2 on the opposite side to the surface is larger than the distance 1tL.

For this reason, the rotating shaft 2 to which the magnetic disk 3 is fixed is inclined with respect to the direction of displacement of the head 16, and if a seek operation is performed in this state, even if the servo head 16a is positioned on the target servo track, other Off-track occurs in the head 16, and this amount of off-track is caused by the magnetic disk 3 located far from the servo head 16a.
This becomes a serious problem when attempting to improve the recording density by arranging a large number of tracks at narrow intervals on each recording surface 3a at high density.

However, in the case of this embodiment, since the heat insulating member 9 is interposed between the stator 6f that fixes the electric motor 6 to the housing 1 and the wall surface 1b of the housing 1, Heat is reliably prevented from being transferred to the housing 1 side.

For this reason, the wall surface 1a that supports both ends of the housing 10 and the rotating shaft 2 is
The occurrence of off-track as described above due to the temperature difference between the casing 1 and the wall surface 1b is avoided, and the temperature distribution inside the casing 1 is also prevented from becoming non-uniform, so that the individual magnetic disks 3, etc. It is also possible to prevent off-track from occurring due to differences in thermal expansion.

As a result, for example, the magnetic disk 3 can be
It becomes possible to increase the arrangement density of the tracks by narrowing the track interval in the magnetic disk 3, thereby improving the recording density of information on the magnetic disk 3.

Furthermore, as in the prior art described above, the electric motor 6 in the housing 1 is installed for the purpose of making the temperature distribution inside the housing 1 uniform.
There is no need to make the gap between the wall surface 1b on the mounting side and the magnetic disk 3 located at the outermost position larger than that on the opposite side (this makes it possible to downsize the casing 1, that is, the magnetic disk device).

Furthermore, an insertion guide hole 8 is provided in the mounting portion of the stator 6f of the electric motor 6 in the housing 1, and by fitting the rib 6g protruding from the stator 6f into the insertion guide hole 8, the stator 6f and Assembling work can be performed with high accuracy without causing damage due to contact with the rotor 6C, and without requiring skill.

In particular, when it becomes necessary to replace the stator 6f while the magnetic disk device is in use, the replacement work can be easily performed, reducing the time required and improving maintainability.

[Embodiment 2] FIG. 2 is a sectional view showing the main parts of a magnetic disk device according to another embodiment of the present invention.

In the second embodiment, a recess 17 is carved in the wall surface 1b of the casing 1 to which the electric motor 6 is mounted, and a recess 17 is carved in the contact surface with the stator 6f of the electric motor 6, and the stator 6f
A recess 18 is carved all around the inner peripheral surface of the insertion guide hole 8 into which the rib 6g fits, so that the contact area between the stator 6f and the housing 1, that is, the heat transfer area, is extremely small. .

As a result, the heat generated from the electric motor 6 creates a temperature between the wall surfaces 1a and 1b of the casing 1 that respectively supports both ends of the rotating shaft 20 of the magnetic disk 3, which causes the rotating shaft 2 of the magnetic disk 3 to tilt. It is possible to prevent differences from occurring.

As a result, the same effects as in the first embodiment can be obtained.

[Embodiment 3] FIG. 3 is a sectional view showing the main parts of a magnetic disk device according to another embodiment of the present invention.

In the case of this embodiment, the housing l of the stator 6f of the electric motor 6
A rib 6 that fits into the contact surface and the insertion guide hole 8
This embodiment differs from the second embodiment in that a recess 17a and a recess 18a are formed on the outer circumferential surface of g, respectively, over the entire circumference.

In this embodiment as well, the contact area between the stator 6f and the casing 1, that is, the heat transfer area, is extremely small, and the heat generated from the electric motor 6 causes the wall surface of the casing 1 that supports both ends of the rotating shaft 2 of the magnetic disk 30 to It is possible to prevent a temperature difference from occurring between 1a and 1b that would cause the rotation axis 2 of the magnetic disk 3 to tilt.

Thereby, the same effects as in the first and second embodiments can be obtained.

[Embodiment 4] FIG. 4 is a sectional view showing an example of the configuration of a magnetic disk device which is a further embodiment of the present invention.

In the fourth embodiment, an electric motor 19 and an electric motor 20 having substantially the same rating, that is, the amount of heat generated during operation, are attached to both ends of the rotating shaft 2 to which the magnetic disk 3 is fixed.

This cancels out thermal adverse effects such as the inclination of the rotating shaft 2 and the uneven temperature distribution inside the housing 1 caused by the thermal expansion of the housing 1 due to the heat generated from the electric motors 19 and 20. The same effects as in 1 to 3 can be obtained.

[Embodiment 5] FIG. 6 is a sectional view of an electric motor that is an embodiment of the present invention.

Note that the structure of the electric motor of Example 5 is the same as that of Examples 1 to 3 above.
Since the structure is almost the same as in the case of , the same lower case letters will be used for the reference numerals of the corresponding members and the explanation thereof will be omitted.

The electric motor 21 of this embodiment has a stator 2 with respect to an object to be mounted.
A heat insulating member 9a made of a polymeric organic material having a lower thermal conductivity than the stator 21f is attached to the contact surface of the stator 21f.

As a result, for example, the heat generated from the electric motor 21 during operation causes local thermal expansion of the part to which the electric motor is attached, causing thermal damage such as distortion in the overall shape of the attached object. It is possible to prevent negative effects.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the Examples and can be modified in various ways without departing from the gist thereof. Nor.

For example, in the embodiment described above, a magnetic disk device was used as an example of a rotating self-storage medium, but the invention is not limited to this, and an electric motor is used to drive the storage medium, such as in an optical disk device. It can be widely applied to general rotating storage devices.

Further, the material of the heat insulating member is not limited to organic polymer materials, and may be any material as long as it has a low thermal conductivity.

Furthermore, the structure of the electric motor is not limited to that presented in the above embodiments.

〔Effect of the invention〕

Among the inventions disclosed in this application, the effects obtained by typical inventions are briefly described below.

That is, according to the rotary storage device of the present invention as set forth in claim 1, a rotary storage medium that is fixed to a rotating shaft and rotates;
A casing in which the rotary storage medium is housed, and the rotary type 8
A head that performs an operation of recording and reproducing information on a self-storage medium, a drive mechanism that performs positioning of this head with respect to the rotary storage medium, a rotor that is fixed to the rotation shaft, and a rotor that is fixed to the casing. The rotary storage device includes a stator and an electric motor that drives the rotating shaft, and has a structure in which a heat insulating member is interposed on the contact surface between the stator and the casing, so that the stator of the electric motor is Since the heat insulating member prevents heat from being transferred to the casing, a temperature difference between the vicinity of the electric motor and other parts of the casing and inside the casing is avoided.

This reduces the amount of off-track that occurs due to, for example, the inclination of the rotation axis caused by differences in thermal expansion of each part of the casing, making it possible to further narrow the track spacing. The recording density in a storage medium can be improved.

Furthermore, for the purpose of preventing uneven temperature distribution within the housing due to heat generation from the electric motor installed at one end of the rotating shaft, for example, the wall surface of the housing on the side where the electric motor is attached,
There is no need to make the distance between the rotary storage medium housed inside the casing larger than that on the opposite side, and the rotary storage device can be made smaller.

Further, according to the magnetic disk device of the present invention according to claim 3, there is provided a rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which the rotary 8-self storage medium is accommodated, and a housing that accommodates the rotary storage medium. a head that records and reproduces information on the medium;
The head is positioned with respect to the rotary storage medium by a drive mechanism that operates, and an electric motor that drives the rotary shaft and includes a rotor fixed to the rotary shaft and a stator fixed to the casing. The rotary storage device is provided with Il! on a contact surface of at least one of the housing and the stator.
! Since the structure is formed by carving out one part, the substantial contact area between the stator and the housing, that is, the heat transfer area, is reduced, so that the heat transfer from the electric motor to the housing through the contact surface between the stator and the housing is reduced. The amount of heat transferred can be reduced, and temperature differences between the vicinity of the electric motor and other parts within the housing and the housing can be avoided.

As a result, for example, the amount of off-track caused by tilting of the rotation axis due to differences in thermal expansion of each part of the casing is reduced, making it possible to narrow the track spacing by -1, making it possible to improve the performance of rotating storage media. The recording density can be improved.

Furthermore, for the purpose of preventing uneven temperature distribution within the housing due to heat generation from the electric motor installed at one end of the rotating shaft, for example, the wall surface of the housing on the side where the electric motor is attached,
There is no need to make the distance between the rotary storage medium housed inside the casing larger than that on the opposite side, and the rotary storage device can be made smaller.

Further, according to the magnetic disk device of the present invention as set forth in claim 4, there is provided a rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which the rotary storage medium is housed, and a housing for storing the rotary storage medium. The head includes a head for recording and reproducing information, a drive mechanism for positioning the head with respect to the rotary storage medium, a rotor fixed to the rotating shaft, and a stator fixed to the housing. The rotary storage device is equipped with an electric motor that drives the rotating shaft, and since the electric motor is disposed at each end of the rotating shaft, by making the ratings of both electric motors the same, etc.
Thermal adverse effects caused by the heat generated by the electric motors at the parts that support both ends of the rotating shaft of the cylindrical body are canceled out, the amount of off-track caused by the heat generated by the electric motors is reduced, and the recording density of the rotary storage medium is improved. can be improved.

Further, according to the electric motor of the present invention as set forth in claim 5, since the mounting surface of the stator in contact with the object to be mounted is constituted by a heat insulating member, the heat transfer to the object to be mounted via the stator is prevented by the heat insulating member. Therefore, it is possible to reduce the adverse thermal effects caused by local thermal expansion of the part of the object to which the electric motor is attached.

Further, according to the electric motor of the present invention as set forth in claim 6, since the stator has a structure in which a recess is carved in the mounting surface of the stator that is in contact with the object to be mounted, the heat transfer area of the stator to the object to be mounted is reduced, so that the stator The amount of heat transferred to the object to be mounted is reduced, and adverse thermal effects caused by local thermal expansion of the part of the object to which the electric motor is attached can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of a rotating storage device which is an embodiment of the present invention, FIG. 2 is a sectional view showing the main parts of a rotating storage device which is another embodiment of the invention, and FIG. FIG. 3 is a cross-sectional view showing the main parts of a rotary storage device according to yet another embodiment of the present invention, and FIG. 4 is a partial cross-sectional view schematically showing the overall configuration of a magnetic disk device according to a fourth embodiment of the present invention. 5 is a schematic sectional view showing an example of the overall structure of a rotary storage device which is an embodiment of the present invention, and FIG. 6 is a schematic sectional view showing an example of the structure of an electric motor which is an embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Housing, la, lb... Wall surface, 2... Rotating shaft, 3... Magnetic disk, 3a, 3b... Recording surface, 4
．． 5...Bearing, 6...Electric motor, 6a...Fixing screw, 6b...Fixing piece, 6C...Rotor, 6d...Gap, 6e...Winding, 6f...Stator , 6g...
Rib, 7...Mounting screw, 8...Insertion guide hole,
9.9a...Insulating member, 10...Guide rail, 11
... Bearing, 12... Carriage, 13... Hata voice coil motor, 14... Arm, 15... Leaf spring, 16... Head, 16a... Servo head, de, 1'? , 18. ITa, 18a--concavity, 19
, 20.21... electric motor, 21f... stator. Agent Patent Attorney Dai Tsutsui 19.20 Electric motor No. 17a, 18a Recess 1c 1d ・Rotating shaft magnetic disk guide rail ・Pairing key Reno/ ・Voice Filmo

Claims (1)

[Claims] 1. A rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which the rotary storage medium is housed, and a head that performs information recording and reproducing operations on the rotary storage medium. a drive mechanism that positions the head with respect to the rotary storage medium; and an electric motor that drives the rotary shaft and includes a rotor fixed to the rotary shaft and a stator fixed to the casing. What is claimed is: 1. A rotary storage device comprising: a heat insulating member interposed between a contact surface between the stator and the housing; 2. The rotary storage device according to claim 1, wherein the heat insulating member is made of a polymeric organic material. 3. A rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which this rotary storage medium is housed, a head for recording and reproducing information on and from the rotary storage medium, and a A rotary storage device comprising: a drive mechanism that performs a positioning operation with respect to a rotary storage medium; and an electric motor that drives the rotational shaft and includes a rotor fixed to the rotational shaft and a stator fixed to the casing. A rotary storage device, wherein a recess is carved in a contact surface of at least one of the housing and the stator. 4. A rotary storage medium that is fixed to a rotating shaft and rotates, a casing in which this rotary storage medium is housed, a head for recording and reproducing information on and from the rotary storage medium, and a A rotary storage device comprising a drive mechanism that performs a positioning operation with respect to a rotary storage medium, and an electric motor that drives the rotation shaft and includes a rotor fixed to the rotation shaft and a stator fixed to the housing. , a rotary storage device comprising electric motors disposed at each end of the rotating shaft. 5. An electric motor characterized in that the mounting surface of the stator that contacts the object to be mounted is made of a heat insulating material. 6. An electric motor characterized in that a recess is carved in the mounting surface of the stator that contacts the object to be mounted.