JP2532489Y2 - Brushless motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to the structure of a brushless motor used for a rotation transmission mechanism of an FDD, a cassette deck, recently a CD, etc., and in particular, to a structure of a stator.

2. Description of the Related Art In recent years, brushless motors have been increasingly used for small motors used in FDDs, cassette decks, CDs, and the like as devices have become thinner and more sophisticated.

Hereinafter, an example of the conventional brushless motor structure will be described with reference to the drawings.

FIG. 2 is a sectional view of a conventional brushless motor. In FIG. 2, reference numeral 13 denotes a bottom plate for shielding electric and magnetic noise, and a resin member 14 is integrally formed at a central portion. An armature in which an armature winding 8 is wound around an iron core 6 via an insulator 7 and a printed circuit board 10 on which circuit elements necessary for driving and controlling are mounted are connected to connection pins 12 press-fitted into the insulator 7. Has been installed through. Further, a burring portion is provided at the center of the bottom plate 13, and the first oil-impregnated metal 9 is press-fitted therein to constitute a stator. Then, a rotor is fixed to a rotor frame 2 to which a cylindrical magnet 1 having N and S poles alternately magnetized in the circumferential direction is fixed, and a rotating shaft 3 press-fitted by applying burring to the center of the rotor frame 2. Make up. The rotor is inserted into the first oil-impregnated metal 9. The second oil-impregnated metal 4 is provided at the center of the steel plate frame 5 forming the frame of the motor.
Are press-fitted and rotatably inserted into the rotary shaft 3 of the rotor, and the stator is press-fitted or joined to form a brushless motor.

However, the above configuration has a disadvantage that the printed circuit board is provided between the bottom plate 13 and the armature, which is disadvantageous for thinning, the structure is complicated, and the price is high. Was.

The present invention has been made in view of the above problems, and provides a brushless motor in which the number of members is reduced, the conventional performance is maintained, and the thickness can be easily reduced.

Means for Solving the Problems In order to solve the above problems, the brushless motor of the present invention directly fits an oil-impregnated metal near the center of a metal printed board on which circuit elements are mounted, and mounts an armature on the metal printed board. It is fixed by being inserted between thrust plates.

Operation The present invention eliminates the necessity of disposing a printed circuit board between the bottom plate and the armature by the above configuration.

Embodiment Hereinafter, a structure of a brushless motor according to an embodiment of the present invention will be described.

FIG. 1 is a sectional view of a brushless motor according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a metal printed circuit board on which circuit elements necessary for driving a motor and controlling the number of rotations at a constant value are mounted, and a first oil-impregnated metal 9 is directly fitted near the center thereof. An armature in which an armature winding 8 is wound around an iron core 6 via an insulator 7 is installed on the metal printed board 10, and the insulator 7 has a plurality of protrusions 15 and is inserted into the metal printed board 10. The stator 15 is sandwiched by a thrust plate 11 which receives a magnetic attraction force of the rotor and the projection 15 is fixed by welding. A stator is constituted by a rotor frame 2 to which a cylindrical magnet 1 having N and S poles alternately magnetized in the circumferential direction is fixed, and a rotating shaft 3 press-fitted by applying burring to the center of the rotor frame 2. doing. The rotor is inserted into the first oil-impregnated metal 9. A second oil-impregnated metal 4 is press-fitted into the center of a steel plate frame 5 that forms the skeleton of the motor, is inserted so as to be rotatable on the rotating shaft 3 of the rotor, and press-fits or inserts the stator. To form a brushless motor.

In the above embodiment, the frame 5 may be omitted depending on whether the second oil-impregnated metal 4 is provided on the inner diameter of the insulator 7 or the first oil-impregnated metal 9 is made longer.

Effects of the Invention As described above, the present invention directly fits an oil-impregnated metal near the center of a metal printed board on which circuit elements are mounted, installs an armature on the metal printed board, and removes a plurality of protrusions of the insulator. By inserting it into a metal printed circuit board, sandwiching it with a thrust plate, and welding and fixing the projections, the printed circuit board between the conventional bottom plate and armature can be omitted, making it possible to easily reduce the thickness and the number of members. And thin,
A low-cost brushless motor can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a brushless motor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional brushless motor. 1 ... magnet, 2 ... rotor frame, 3 ... rotating shaft, 4 ... second oil-impregnated metal, 5 ... frame, 6 ...
Armature core, 7 insulator, 8 armature winding, 9 first oil-impregnated metal, 10 printed circuit board, 11
…… Thrust plate, 12 …… Connection pin, 13 …… Bottom plate, 14 ……
Resin member, 15 ... Projection.

Claims (1)

(57) [Scope of request for utility model registration] At least a part of a circuit element necessary for driving a motor and controlling the number of rotations is mounted on a metal printed circuit board, and an oil-impregnated metal is directly fitted near the center thereof.
An armature in which a copper wire is wound around an iron core via an insulator on the metal printed board is provided, and the insulator is provided with a plurality of projections, and the projections are inserted into the metal printed board, and a rotor is provided. A brushless motor comprising: a thrust plate made of a resin material receiving a magnetic attraction force;