JP2740423B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a housing fixing structure.

[0002]

2. Description of the Related Art An example of a conventional brushless motor will be described with reference to the drawings. In FIG. 6, a hole is formed at the center of the stator plate 27, and a cylindrical housing 26 is attached to the hole. The rotating shaft 25 is inserted into a central through hole of the housing 26, and the rotating shaft 25 is rotatably supported by bearings 32 attached to two upper and lower portions inside the through hole of the housing 26. A flange 26a is formed on the outer periphery of the housing 26. The lower surface of the flange 26a is
7 is in contact with the upper surface. In order to improve the accuracy of attaching the rotor case to the stator plate 27, which will be described later, the lower surface of the flange portion 26a of the housing 26 is lace-worked.

[0003] A flange 26 is formed around the outer periphery of the housing 26.
The stator core 22 is mounted on the upper surface of the frame a. The stator core 22 is formed by laminating a plurality of core bodies, a plurality of salient poles is formed on the outer peripheral portion, and the coil 21 is wound around each of the salient poles. The stator core 22, the flange portion 26, and the
a, a hole 29 penetrating through the stator plate 27 is formed, and a fastening member 28 is inserted into the hole 29. Fastening member 2
The tip of 8 is screwed to the stator plate 27, and the stator core 22 and the flange 26 a are pressed and fixed to the stator plate 27 by the head of the fastening member 28.

[0004] Above the rotating shaft 25, a bottomed cylindrical rotor case 24 is mounted. A hub table 33 for mounting a disk is formed on the upper surface of the rotor case 24, and a cylindrical drive magnet 23 is mounted inside the peripheral wall of the rotor case 24. The inner peripheral surface of the drive magnet 23 is in contact with the outer peripheral surface of the salient pole of the stator core 22,
They face each other with a gap. Therefore, when the stator coil 21 wound around the salient poles of the stator core 22 is energized, the drive magnet 2
3, the rotor case 24 and the rotating shaft 25 are driven to rotate.

[0005]

According to the conventional motor as described above, the rotor case 2 with respect to the stator plate 27 is
4 is important, and it is necessary to race the surface of the housing 26 to be attached to the stator plate 27, and it is necessary to process holes and the like used for the fastening member 28. And the cost increased. Incidentally, the housing 26 is formed of a relatively soft material such as zinc die cast or aluminum die cast so as to be easily processed. When the motor is thinned, the flange 26a of the housing 26 and the stator core 22 are also thinned. Such a thinned stator core 2
When the fastening member 28 is inserted into and screwed into the flange portion 26a, the stator core 22 is pressed by the head of the fastening member 28, but the force for pressing the stator core 22 is not uniform and concentrates on a specific location. Therefore, the stator core 2
The shape of No. 2 changes. There is no problem if the flange portion 26a has a sufficient thickness. However, since the flange portion 26a is thin, the member of the flange portion 26a is absorbed by a portion of the stator core 22 where the shape has changed, and the overall shape changes. The mounting accuracy of the housing 26 is degraded. If the mounting accuracy of the housing 26 is poor, the rotor case 24
As a result, the hub 33 formed at the position shown in FIG.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is capable of mounting a rotor case to a stator plate accurately at low cost without being affected by the flatness of a stator core. It is intended to provide a possible motor.

[0007]

According to the first aspect of the present invention,
A stator core having a plurality of salient poles around which a stator coil is wound, a rotor case to which a drive magnet facing the stator core is fixed, and a bearing rotatably supporting a rotating shaft fixed to a center position of the rotor case And a housing that penetrates the stator core,
A motor having a fastening member having a housing fixed to a stator plate via a stator core, wherein the fastening member is inserted between the stator core and the stator plate having a through hole through which the fastening member passes. a substantially disc-shaped core holder is separate from the said housing having an insertion hole to be is provided, this
The above housing is arranged on the inner side of the core holder in the radial direction.
A part of the above housing is a core holder.
An extension is formed extending toward the fixing member.
Secures the stator core and core holder to the stator plate
And the inner periphery of the stator core urges the extension
To, characterized in that to fix the housing in Sutetako A.

[0008] The invention according to claim 2 is the invention by using a fastening member.
A core holder fixed to the stator plate together with the stator core
The inner peripheral edge of the holder urges the extension of the housing,
The housing is fixed with a rudder.

[0009]

A core holder is disposed between the stator core and the stator plate so as to face the housing in the radial direction. The housing is fixed on the stator plate by pressing the housing with the stator core or the core holder fixed by the fastening member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the brushless motor according to the present invention will be described below with reference to the drawings. 1, the center portion of the stator plate 7 made from the circuit board has holes is formed, tubular housing 6 so as to surround the hole portion is arranged on the stator plate 7. The housing 6 has a conical inclined portion formed at the upper portion of the outer periphery , and extends outward toward the core holder 11 described later at the lower portion of the outer periphery.
A flange 6b is formed as a short extension . Also, the bearing 12 is accurately assembled to the lower surface of the housing 6. Further , the rotating shaft 5 is inserted into the central through hole of the housing 6 with the bearing 12 interposed therebetween .
The rotating shaft 5 is rotatably supported by a bearing 12.

On the stator plate 7, a substantially disk-shaped core holder 11 separate from the housing 6 is provided outside the housing 6. The core holder 11 has a positioning foot 11a, and the foot 11a is
The position on the stator plate 7 is determined by fitting into the hole formed above. Comparing the height of the upper surface of the flange 6b of the housing 6 and the upper surface of the core holder 11, the dimensional relationship is such that the upper surface of the flange 6b is slightly higher. A stator core 2 formed by laminating a plurality of core bodies is attached to a portion formed by the upper surfaces of the two members. The stator core 2 has a plurality of salient poles on an outer peripheral portion, and the stator coil 1 is wound around each salient pole. Through holes 9 in the base side of the stator core 2, the through hole in the core holder 11
An insertion hole 10 having a diameter larger than 9 is formed, and a fastening member 8 is inserted into the through hole 9 and the insertion hole 10. The tip of the fastening member 8 is a screw hole 15 of the stator substrate 7.
, And the head of the fastening member 8 is
Is pressed in the direction of the stator plate 7, and the stator core 2 presses the core holder 11 against the stator plate 7, whereby the stator core 2 and the core holder 11 are fixed to the stator plate 7.
It is fixed on top. The height of the upper surface of the flange 6b of the housing 6 and the upper surface of the core holder 11 is the same as that of the flange 6b.
Since the upper surface of is slightly higher ,
Serial stearyl and screwed into the screw hole 15 of the stator board 7 as
When the stator core 2 is fixed to the stator plate 7, an elastic force is generated at the inner edge of the stator core 2. The housing 6 is fixed by pressing the flange portion 6b with this elastic force.

A cup-shaped rotor case 4 is mounted on the upper part of the rotating shaft 5. The ring-shaped drive magnet 3 is attached to the inner surface of the peripheral wall of the rotor case 4.
The inner peripheral surface of the drive magnet 3 faces the outer peripheral surface of the salient pole of the stator core 2 with a gap. When the energization of the stator coil 1 wound around the salient poles of the stator core 2 is controlled,
The opposing drive magnet 3 is energized, and the rotor case 4
And the rotating shaft 5 is driven to rotate.

FIG. 2 shows an example of the procedure for assembling the motor as described above.
This will be described with reference to FIG. First, the housing 6 in which the bearing 12 is press-fitted is arranged on the stator plate 7 on which circuit elements are mounted in advance. Next, a core winding set constituted by the core holder 11 and the stator core 2 is arranged on the stator plate 7. The core holder 11 has a positioning foot 11a, and the position on the stator plate 7 is determined by fitting the foot 11a into a hole formed on the stator plate 7. At the same time when the core winding set is mounted on the stator plate 7, the inner peripheral edge of the stator core 2 comes into contact with the upper surface of the flange 6 b of the housing 6. The fastening member 8 includes the stator core 2 and the core holder 1.
1 and the distal end of the fastening member 8 is screwed to the stator plate 7. By screwing the fastening member 8, the head of the fastening member 8 pushes the stator core 2 and the core holder 11 toward the stator plate 7, and the flange portion 6 b of the housing 6 is moved by the elastic force of the stay core 2. It is pressed and fixed to the plate 7 side. Finally, the rotating shaft 5 on which the rotor case 4 and the like have been assembled is inserted into the bearing 12 press-fitted into the housing 6 to complete the motor.

[0014] The motor having the above-described structure is provided with a stator core.
A , bearing member 8 is fastened by fastening member 8 penetrating through core holder 11.
Ujingu 6 not directly pressing Runode and so the stator core 2 is fixed to the housing 6 to bias the flange portion 6b of the housing 6 by the elastic force of the stator core 2 caused by being pressed by the head of the fastening member 8 ing. For this reason, a uniform force can be applied to the entire flange portion 6b, and the housing 6 is not deformed, so that the mounting accuracy of the housing 6 can be improved. Further, the flange portion 6b pressed by the stator core 2 is
Since it is formed relatively small, it is not deformed under the influence of the undulation of the mounting surface of the housing 6 by the stator core 2 and the mounting accuracy is not deteriorated. If the mounting accuracy of the housing 6 is improved, the accuracy of the rotor case 4 with respect to the stator plate 7 is also improved. on the other hand,
Since the size of the portion of the housing 6 pressed by the stator core 2 can be small, the size of the housing 6 itself can be reduced. In addition, when the size is reduced, the material removal becomes good and the number of processing steps is reduced, so that the cost is reduced. Leads to.

The example of fixing the motor housing is not limited to the above embodiment. For example, as shown in FIG. 3, the vicinity of the mounting of the stator core 2 in the height direction of the housing 6 is formed in a conical shape to form the inclined portion 6a. The inner peripheral edge of the uppermost core element constituting the stator core 2 may be obliquely extended to form a holding portion 2a, and the holding portion 2a may press and fix the inclined portion 6a of the housing 6. As shown in FIG. 4, the vicinity of the mounting of the stator core 2 in the height direction of the housing 6 is formed in a conical shape, and the inclined portion 6 is formed.
a is formed. For example, an oblique projection is formed at the upper edge of the inner periphery adjacent to the housing 6 above the core holder 11 formed of a resin or the like to form a pressing portion 11b, and the pressing portion 11b
Alternatively, the inclined portion 6a of the housing 6 may be pressed and fixed by the elastic force. Further, as shown in FIG. 5, the vicinity of the housing 6 where the core holder is attached is formed in a conical shape to form the inclined portion 6c. The portion of the core holder 11 attached to the position adjacent to the core holder 11 on the housing 6 side is also formed obliquely as a holding portion 11c. May be fixed.

In any of the above-described embodiments, the housing 6 is not directly fixed by the fastening member 8 or the like, but is relied on by the elastic force of the stator core 2 or the core holder 11 and almost the entire circumference or a part of the housing 6. Since the core holder and a part of the stator core 2 are fixed in contact with each other, the mounting accuracy of the housing 6 does not deteriorate, and the same effects as in the above-described embodiment can be obtained.

[0017]

According to the present invention, the stator core and the stay
A plate having an insertion hole through which a fastening member is inserted.
A disk-shaped core holder is provided.
A housing for holding the bearing is arranged on the radially inner side,
Part of the housing faces the core holder
An extended portion that extends is formed, and the fastening member includes a stator.
While fixing the core and the core holder to the stator plate
The inner peripheral edge of the stator core or core holder is
And the housing is fixed to the stator plate by the stator core or the core holder. Therefore, even if the motor is thinned, the housing is not deformed, and the housing and the bearing can be accurately mounted on the stator plate. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a motor according to the present invention.

FIG. 2 is an exploded sectional view of the same.

FIG. 3 is a sectional view showing another embodiment of the motor according to the present invention.

FIG. 4 is a sectional view showing still another embodiment of the motor according to the present invention.

FIG. 5 is a sectional view showing still another embodiment of the motor according to the present invention.

FIG. 6 is a sectional view showing an example of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator coil 2 Stator core 3 Drive magnet 4 Rotor case 5 Rotating shaft 6 Housing 7 Stator plate 8 Fastening member 9 Through hole 10 Insertion hole 11 Core holder

Claims (2)

(57) [Claims] And 1. A stator core having a plurality of salient stator coil is wound, and a rotor case the drive magnet is secured opposite to the stator core, the rotating shaft is Kai fixed to the center position of the rotor case A motor comprising: a housing for holding a bearing rotatably supported; and a fastening member penetrating the stator core and fixing the housing to a stator plate via the stator core. There between the stator core and the stator plate having a through hole penetrating, substantially disk-shaped core holder is separate from the said housing having an insertion hole in which the fastening member is inserted is provided, This corehol
The housing is arranged on the inner peripheral side in the radial direction of the
A part of the jing faces toward the above core holder
An extended portion is formed to extend, and the fastening member is
The stator core and the core holder are fixed to the stator plate
And the inner peripheral edge of the stator core
Motor, wherein the this <br/> securing the housing to the stator plate by biasing. 2. A plurality of salient poles on which a stator coil is wound.
And a stator core having the same.
The rotor case to which the drive magnet is fixed and this rotor
Fixed to the center of the case, rotatably supporting the rotating shaft
The housing that holds the bearings and the stator core
Penetrates through the stator core
With a fastening member that fixes the ring to the stator plate.
A through hole through which the fastening member passes.
The fixing is performed between the stator core and the stator plate.
Separate from the above housing, which has an insertion hole through which the member is inserted
A substantially disk-shaped core holder is provided.
The housing is disposed on the radially inner peripheral side of the
A part of the housing faces the above core holder
An extended portion is formed, and the fastening member is
The stator core and the core holder are attached to the stator plate.
While fixing, the inner peripheral edge of the core holder extends
Part of the housing to fix the housing to the stator plate.
A motor characterized in that: