JPH0568362A - Dc brushless motor - Google Patents

Abstract

PURPOSE:To obtain a DC brushless motor to be employed in various electric appliances in which downsizing and thinning can be realized. CONSTITUTION:An IC 13 is arranged on a board 12 so that the IC 13 is located substantially in the center of an armature 8. A shield board 14 is placed underneath the board 12 secured with the armature 8 applied with a coil 10 and the armature 8 is disposed oppositely to a tubular rotary permanent magnet 6 thus constituting a DC brushless motor. With such constitution, pattern wiring from the IC 13 can be facilitated and the area of pattern wiring can be reduced with respect to the board and thereby the profile of the board 12 can be reduced resulting in downsizing of DC brushless motor. Furthermore, no restriction is imposed by the coil 10 applied on the armature 8 and thereby a thin DC brushless motor can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a DC brushless motor used in OA equipment or audio / video equipment.

[0002]

2. Description of the Related Art In recent years, OA equipment, audio equipment, and video equipment have tended to be smaller and thinner. As a result, DC brushless motors are required to be smaller and thinner.

An example of a conventional brushless motor will be described below with reference to the drawings. FIG. 3 is a sectional view of a conventional DC brushless motor, in which the rotating shaft 31 is a frame 32.
A rotor frame 36 having a cylindrical rotating permanent magnet 35, which is held by a bearing 33 and a thrust receiving plate 34 which are held by the above, and which is magnetized in multiple poles. Further, after the IC 311 is mounted on the counter rotor frame side substrate 37 around the armature 310 around which the coil 39 is wound via the insulator 38, the shield plate 312 for shielding magnetic noise is provided on the substrate 37. Disposed below the armature 310.
After disposing the resin member 313 on the substrate 37,
The armature 310 is arranged so as to face the cylindrical rotating permanent magnet 35 to form a DC brushless motor.

[0004]

However, in the above-described conventional configuration, the IC 311 is arranged on the substrate 37 at a position facing the peripheral portion of the armature 310, and therefore the IC
It is difficult to perform pattern wiring from the above, and the outer shape of the pattern wiring upper substrate 37 must be increased, which makes it difficult to reduce the size of the DC brushless motor.

Further, the DC brushless motor can be made thinner by disposing the IC 311 on the substrate so that the IC 311 is located in the slot portion between the salient poles of the armature. Due to the coil 39 wound around the armature 310, it was difficult to make the DC brushless motor thinner.

The present invention solves the above problems, and an object thereof is to provide a smaller and thinner DC brushless motor.

[0007]

In order to achieve this object, the DC brushless motor of the present invention has a structure in which the IC is arranged on a substrate facing the vicinity of the center of the armature.

[0008]

With this configuration, since the IC is arranged on the substrate facing the vicinity of the center of the armature, the pattern wiring from the IC can be facilitated and the area of the pattern wiring on the substrate can be reduced. The outer shape of the substrate can be reduced, and a small DC brushless motor can be realized.

Further, since the IC, which requires the most space in the circuit components, is arranged near the center of the armature, there is no restriction from the coil wound around the armature, and a thinner DC brushless motor can be provided. Can be realized.

[0010]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a DC brushless motor according to an embodiment of the present invention. In FIG. 1, a rotary shaft 1 is held by a bearing 3 held by a frame 2, and a retaining ring 4 mounted on the rotary shaft 1 is held by the bearing 3 via a spacer 5 in the thrust direction, thereby providing a multi-pole. A rotor frame 7 holding a magnetized cylindrical rotating permanent magnet 6 is held. A coil 10 is wound around the armature 8 via an insulator 9, and a fixing member 11 is attached. An IC 13 is mounted on the board 12 so as to come near the center of the armature 8, and a shield plate 14 for shielding magnetic noise is arranged under the board 12. Also, the fixing member 1
After fixing 1 to the substrate 12 with the fixing material 15, the armature 8 is arranged so as to face the cylindrical rotary permanent magnet 6 to form a DC brushless motor.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view of a DC brushless motor according to the second embodiment of the present invention. In FIG. 2, the rotary shaft 1 is held by a bearing 3 held by a frame 2.
In the thrust direction, a retaining ring 4 attached to the rotating shaft 1 is held by a bearing 3 via a spacer 5, and a rotor frame 7 holding a multi-pole magnetized cylindrical rotating permanent magnet 6 is held. ing. A coil 10 is wound around the armature 8 via an insulator 9, and a fixing member 11 is attached. Further, after the IC chip 213 is mounted on the metal substrate 212 so as to come close to the center of the armature 8, the thermosetting resin 214 is dropped and sealed and molded. After fixing the fixing member 11 to the metal substrate 212 with the fixing material 15, the armature 8 is arranged so as to face the cylindrical rotating permanent magnet 6 to form a DC brushless motor.

[0014]

As described above, according to the present invention, since the IC is arranged on the substrate facing the vicinity of the center of the armature, there is no restriction on the pattern wiring from the IC, and the area of the pattern wiring on the substrate can be reduced. Since the number can be reduced, the outer shape of the substrate can be reduced and a small DC brushless motor can be realized.

Also, since the IC is arranged near the center of the armature, there is no restriction from the coil wound around the armature, and a smaller DC brushless motor can be realized. ..

[Brief description of drawings]

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

FIG. 2 is a sectional view of a DC brushless motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional DC brushless motor.

[Explanation of reference symbols] 1,31 rotating shaft 2,32 frame 3,33 bearing 4 retaining ring 5 spacer 6,35 cylindrical rotating permanent magnet 7,36 rotor frame 8,310 armature 9,38 insulator 10,39 coil 11 Fixing member 12,37 Substrate 13,311 IC 14,312 Shield plate 15 Fixing material 34 Thrust receiving plate 212 Metal substrate 213 IC chip 214 Thermosetting resin 313 Resin member

Claims (2)

[Claims] 1. A rotor portion having a rotating permanent magnet held on a rotating shaft and magnetized in multiple poles, a bearing portion rotatably supporting the rotating shaft, an armature, and a DC brush near the center of the armature. A DC brushless motor comprising: a stator portion having a circuit board on which an IC for driving or controlling a motor is mounted. 2. The DC brushless motor according to claim 1, wherein the circuit board is a metal board, and the IC is an IC chip mounted on the metal board and sealed and molded with a thermosetting resin.