JP2003158836A - Motor arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor arrangement wherein rotational accuracy is enhanced; abnormal noise from a motor is eliminated; and the number of points of thermal welding can be reduced to reduce a machining cost. SOLUTION: A stator core 15 is secured directly on a housing 13 by thermal welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor device that can be used in electric equipment such as a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art A conventional motor device will be described below. FIG. 3 is a sectional view of a conventional motor device used for a capstan of a magnetic recording / reproducing apparatus, and FIG. 4 is a partially enlarged plan view. Reference numeral 1 is a shaft for driving a magnetic tape by pressing a pinch roller, 2 is an oil-impregnated bearing for holding the shaft 1 by boundary lubrication, 3 is a housing for fixing the oil-impregnated bearing 2 by press fitting, 3a is a terminal holder 4 and a housing 3. Heat-welded portion, 4 is a terminal holder for holding the terminal 4a, and 5 is a housing 3
A stator core fixed in the press-fitting fitting portion 8 at 5a, a coil for winding an electric wire around the stator core 5, 5b a heat-welded portion between the terminal holder 4 and the stator core 5, and 4a connecting the coil 5a and the stator P plate 6 to each other. Terminal terminal, 6 is a stator P plate, 6a is a terminal holder 4
Is a heat-welded portion of the stator P plate 6, and 7 is a rotor magnet that generates rotational torque by attraction and repulsion with the stator core 5. Reference numeral 8 is a press-fitting fitting portion. The housing 3 and the stator core 5 center the rotor magnet 7 and the stator core 5 in the press-fitting fitting portion 8.

The operation of the conventional motor device configured as described above will be described below. A driving current flows through the path of the stator P plate 6 → the terminal terminal 4a → the coil 5a, a magnetic field is generated in the stator core 5, and a rotational torque is generated by the repulsion of attraction with the rotor magnet 7, and the oil-impregnated bearing 2 is used for boundary lubrication. The shaft 1 held by the shaft rotates to drive the tape.

[0004]

However, in the above-described conventional configuration, vibration of cogging and ripple components of the motor is directly transmitted from the stator core 5 to the housing 3 and resonates with the chassis to generate an abnormal sound.

Vibration can be damped by the terminal holder 4 by fitting the outer diameter of the housing 3 and the inner diameter of the stator core 5 into a clearance fit to change the transmission path from the stator core 5 to the terminal holder 4 to the housing 3. However, the centering of the rotor magnet 7 and the stator core 5 becomes rough, uneven rotation occurs, the tape WOW is affected, and the terminal holder 4 as a vibration damping component is required, which increases the material cost.

Further, in order to fix the terminal holder 4, there are three heat-welded portions 6a between the terminal holder 4 and the stator P plate 6, three heat-welded portions 5b between the terminal holder 4 and the stator core 5, and the terminal holder. Four
The heat welding portion 3a between the housing 3 and the housing 3 requires a total of nine heat welding portions, which is high, and the processing cost is high. Thus, there are problems in terms of performance and cost.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a motor device which improves the rotation accuracy, has no abnormal noise of the motor, and reduces the processing cost.

[0008]

In order to achieve this object, a motor device according to the present invention includes a bearing for holding a shaft, a housing for fixing the bearing by press fitting, a stator core for fixing to the housing, and an electric wire for the stator core. A motor device having a coil to be wound and a stator P plate for wiring the coil, which has a structure in which a stator core is directly heat-welded and fixed to a housing.

With this structure, the rotation accuracy is improved,
In addition, it is possible to provide a motor device in which there is no abnormal noise of the motor, the number of heat-welded portions can be reduced, and the processing cost can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a bearing for holding a shaft, a housing for fixing the bearing by press fitting, a stator core for fixing to the housing, and a coil for winding an electric wire around the stator core. And a motor device having a stator P plate for wiring the coil, characterized in that the stator core is directly heat-welded and fixed to the housing, whereby the rotation accuracy is improved and abnormal noise of the motor is generated. In addition, the number of heat-welded portions can be reduced and the processing cost can be reduced.

According to a second aspect of the present invention, there is provided a bearing for holding the shaft, a housing for fixing the bearing by press fitting, a stator core for fixing to the housing, a coil for winding an electric wire around the stator core, and a coil. A motor device having a stator P plate for wiring, which is characterized in that the stator P plate is directly heat-welded and fixed to the housing, and the number of heat-welded portions can be reduced to reduce the processing cost. It has the effect that

Embodiments of a motor device according to the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a sectional view of a motor device according to a first embodiment of the present invention, and FIG. 2 is a partially enlarged plan view of FIG. Reference numeral 10 is a chassis, 11 is a shaft for driving a magnetic tape by pressing a pinch roller, 12 is an oil-impregnated bearing that holds the shaft 11 by boundary lubrication, 13 is a housing for fixing the oil-impregnated bearing 12 by press fitting, and 15 is a housing A stator core that is heat-welded to and fixed to the stator core 15a, a coil that winds an electric wire around the stator core 15, 16 is a stator P plate, 17 is a rotor magnet that generates rotational torque by attraction and repulsion with the stator core 15, and 18 is a stator P plate 16 and a housing. Reference numeral 13 is a heat-welding portion for directly heat-welding without using the terminal holder 4, and 19 is a heat-welding portion for directly heat-sealing the stator core 15 and the housing 13 without using the terminal holder 4.

The operation of the motor device constructed as above will be described. At the same time as the housing 13 and the stator core 15 are centered and attached, cogging,
In order to damp the vibration of the ripple component, the housing 13
A boss is provided on the core to center and heat-fix the stator core 15. At this time, if a fastening member such as a screw is used, the rigidity of the mounting portion is increased and vibration is not damped and resonates with the chassis 10 to generate an abnormal sound. In this way, the housing 1
3 is provided with a boss and is centered and heat-welded and fixed, so that the rotation accuracy can be improved and the abnormal noise of the motor can be eliminated.
The number of heat-welded portions with the plate 16 can be reduced to three, and the number of heat-welded portions with the housing 13 and the stator core 15 can be reduced to three, so that the processing cost can be reduced.

The other operations are similar to those of the conventional example.

As described above, according to the present embodiment, by directly fixing the stator core 15 to the housing 13 by heat welding, the rotation accuracy can be improved and abnormal noise of the motor can be eliminated, and the heat welding portion can be eliminated. The number of parts can be reduced and the processing cost can be reduced.

Further, by directly fixing the stator P plate 16 to the housing 13 by heat-welding, the number of heat-welding portions can be reduced and the processing cost can be reduced.

[0018]

As described above, according to the present invention, since the stator core is directly heat-welded and fixed to the housing, the rotation accuracy can be improved and the abnormal noise of the motor can be eliminated.
Further, it is possible to obtain the excellent effect that the number of heat-welded portions can be reduced and the processing cost can be reduced.

Further, by directly fixing the stator P plate to the housing by heat-welding, it is possible to reduce the number of heat-welding portions and reduce the processing cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a motor device according to a first embodiment of the present invention.

2 is a partially enlarged plan view of FIG.

FIG. 3 is a sectional view of a conventional motor device.

4 is a partially enlarged plan view of FIG.

[Explanation of symbols]

10 chassis 11 shaft 12 Oil-impregnated bearing 13 housing 15 Stator core 15a coil 16 Stator P plate 17 rotor magnet 18 Heat-welded portion between stator P plate and housing 19 Thermally welded portion between stator core and housing 20 Stator P board wiring

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 5/04 H02K 5/04 5H621 15/02 15/02 D 21/22 21/22 M (72) Invention Person Kurobe Kisaburo 1006, Kadoma, Kadoma-shi, Osaka Prefecture F-term within Matsushita Electric Industrial Co., Ltd. (reference) PB03 5H605 AA05 AA08 BB05 BB19 CC01 CC02 CC03 CC10 DD05 DD09 EA02 EB02 EB06 EB13 EB21 GG02 GG04 5H615 AA01 BB01 BB07 BB14 BB16 PP01 PP06 PP25 PP28 Q07K07K01K13K01K01QH02QQ02 QQ19 RR02 SS05 SS11 SS13 GA01K08KJH08

Claims (2)

[Claims] 1. A bearing for holding a shaft, a housing for fixing the bearing by press fitting, a stator core for fixing to the housing, a coil for winding an electric wire around the stator core, and a stator P for wiring the coil.
A motor device having a plate, wherein the stator core is directly heat-welded and fixed to the housing. 2. A bearing for holding a shaft, a housing for fixing the bearing by press fitting, a stator core for fixing to the housing, a coil for winding an electric wire around the stator core, and a stator P for wiring the coil.
A motor device having a plate, wherein the stator P plate is directly heat-welded and fixed to the housing.