JP3517088B2 - Fan motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor used for information equipment or power supply equipment. 2. Description of the Related Art FIG. 5 shows a configuration of a conventional fan motor. FIG. 5 is a cross-sectional view of a main part of the radial gap type fan motor. In FIG. 5, a bearing holder 23 is arranged on a shaft 21 via a bearing 22. A core 24 composed of four salient poles formed by lamination is fixed, and an armature coil 25 is applied to the core 24 to form a stator S. [0003] A quadrupole magnet 27 is attached to the inner periphery of a rotor yoke 26 made of a magnetic material through a predetermined gap with the core 24, and the shaft 21 is integrally formed by resin molding. And a rotor R. And this rotor R
Has a plurality of impellers 28 formed on the outer periphery of the rotor yoke 26 simultaneously with the resin molding. Reference numeral 29 denotes a circuit board, on which various circuit components 30 are mounted on the opposite side to the armature coil 25, and terminals of the armature coil 25 are formed on the circuit board 29. Connected to the specified circuit pattern. Reference numeral 31 denotes a frame arranged so as to cover the outer periphery of the turning space of the impeller 28, and reference numeral 32 denotes a ring mounted on the shaft 21 for preventing the rotor R from coming off. However, in the above configuration, since the cores 24 are provided with salient poles at 90 ° intervals, the circuit is mounted on the armature coil 25 side with respect to the circuit board 29. The component 30 could not be mounted. Therefore, a space must be secured on the circuit board 29 on the side opposite to the armature coil 25, and the circuit components 30 must be mounted on the circuit board 29 in the space. When that happens,
As the shape of the motor becomes carelessly thick, it is difficult to reduce its thickness. If an attempt is made to reduce the thickness of the motor, the thickness of the core 24 and the like must be sacrificed. The same can be said for the axial gap type fan motor. Accordingly, an object of the present invention is to provide a fan motor capable of solving the above-mentioned problems and easily realizing a thin motor while maintaining good motor characteristics. SUMMARY OF THE INVENTION The present invention provides a core having two salient poles at 90 ° intervals deviated to one side as viewed from a plane.
And an opening angle of 90 ° for the stator with an armature coil applied thereto and facing the stator via a predetermined gap.
A rotor having a field magnet formed in a more radially-spaced shape , wherein the stator has the remaining angular portion of 90 degrees.
Circuit components are mounted in the space formed in the low
The above problem has been solved by forming an impeller integral with the yoke on the motor , which eliminates the need to consider the space for circuit components mounted on the circuit board separately from the stator. Since the thickness of the circuit component is substantially absorbed into the thickness of the stator, the motor can be easily made thinner without sacrificing the characteristics of the motor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fan motor according to the present invention has two salient poles at a 90 ° arrangement angle deviated to one side as viewed from a plane.
A stator having an armature coil applied to a core to be formed, and a stator having a magnetization opening angle of 90 ° facing the stator via a predetermined gap .
A rotor having a field magnet formed into a radial gap type, and the stator has the remaining 90 ° angle.
Circuit components are mounted in the space formed at the corner ,
The rotor is formed with an impeller integrated with a yoke . By doing so, the circuit board 9 is mounted.
Circuit components 10 are placed in a space within the same thickness as the coil
The thickness of the circuit components
Has no effect and is thinner
Without sacrificing the thickness of the core 4 etc.
The motor R can always generate a unidirectional rotational driving force.
it can. FIG. 1 is a longitudinal sectional view of a main part of a radial gap type fan motor according to an embodiment of the present invention. FIG. 2 is a main part of the radial gap type fan motor in FIG. FIG. In FIG. 1, reference numeral 1 denotes a shaft, and one end 1a of the shaft 1 is fixed to a central portion of a rotor yoke to be described later by press-fitting or bonding. The other end 1b of the shaft 1 is provided with a groove b. The shaft 1 is provided with a bearing holder 3 also serving as a core cover via a bearing 2. The bearing holder 3 has a core 4 formed by laminating a plurality of thin plates such as silicon steel plates. The shaft 1 is provided with a gap, and the core 4 is provided with an armature coil 5. Thus, the stator S is configured. Reference numeral 6 denotes a cylindrical rotor yoke.
In order to hold one end 1a of the shaft 1, a burring process is applied to a central portion thereof. A field magnet 7 is attached to the inner periphery of the rotor yoke 6 with a predetermined gap between the core 4 and the rotor yoke 6 to form a rotor R. Further, a plurality of impellers 8 are provided on the outer periphery of the rotor R at equal intervals integrally with the yoke 6. Reference numeral 9 denotes a circuit board on which various circuit components 10 are mounted, and the armature coil 5
Are connected to the circuit pattern formed on the circuit board 9. Reference numeral 30 denotes a frame arranged so as to cover the outer periphery of the turning space of the impeller 8, and 31 denotes a rotor R
This is a ring attached to the groove b of the shaft 1 described above to prevent the ring from coming off. Further, the rotor yoke 6 is formed into a cylindrical shape by pressing a metal plate, for example, an iron plate or the like, in this case, by drawing, and further bending the impeller 8 punched out on its outer periphery into a curved shape. And a yoke / impeller in which the rotor yoke 6 and the impeller 8 are integrated from one material. Here, as shown in FIG. 2, the stator S has a core 4 having two salient poles arranged at 90 ° intervals.
The armature coils 5 are applied to the salient poles, and are arranged so that the circumference thereof is deviated to one side. Then, the circuit component 10, for example, a hall element, a transistor, or the like is mounted in an empty space by distorting the armature coil portion. The field magnet 7 disposed on the rotor R is magnetized with four poles at a magnetization opening angle of 90 °. The output of the Hall element is switched every 90 ° rotation, so that full-wave driving by a single phase is performed. Making it possible. In addition, the shape of the salient poles of the core 4 may be cut asymmetrically to facilitate the start of the motor. In this way, the circuit components 10 mounted on the circuit board 9 can be arranged in a space having the same thickness as the coil, and the thickness of the circuit components does not affect the thickness of the motor. become. In addition, the rotor R can always generate a unidirectional rotational driving force without sacrificing the thickness of the core 4 or the like in reducing the thickness. FIG. 3 is a longitudinal sectional view of an essential part of an axial gap type fan motor according to another embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part of the axial gap type fan motor in FIG. 3. That is, in the figure, a bearing holder 13 serving also as a frame is arranged on a shaft 11 via a ball bearing 12, and an air-core coil 15 is mounted on the bearing holder 13 to constitute a stator S. The disk yoke 16 is provided with a burring process at its center in order to hold one end 11a of the shaft 11, and a predetermined gap is formed in the inner surface of the rotor yoke 16 in the air-core coil 15. The field magnet 17 is attached through the
Is composed. Further, this rotor R has a yoke 1
A plurality of impellers 18 are provided at equal intervals on the outer periphery of the motor 6. In the present embodiment, the rotor yoke 16 is formed in a disk shape by punching out an iron plate or the like made of a magnetic material, and the impeller 18 simultaneously punched out around its outer periphery is bent and raised. In this embodiment, a rotor / yoke 16 and an impeller 18 are integrated to form a yoke / impeller. Further, as shown in FIG.
Two air-core coils having an opening angle of 0 ° are arranged at intervals of 120 ° so as to be deviated on the circumference. Then, similarly to the above embodiment, the thickness of the motor can be reduced by placing the circuit component 10 in the space formed on the opposite side of the stator R. In this case, if the field magnet 17 arranged on the rotor R is magnetized with six poles at a magnetization opening angle of 60 °, the output of the Hall element switches every 60 ° rotation, and the single-phase operation is performed. Full-wave driving becomes possible. It should be noted that the present invention is not limited to the above embodiments, but can be implemented with appropriate modifications without departing from the gist of the present invention. For example, in the above-described embodiment, the shaft rotary type has been described in detail as an example. As described above, according to the present invention, a stator having an armature coil deflected to one side as viewed from a plane, and a field magnet facing the stator through a predetermined gap. And the circuit components are mounted in the space formed on the opposite side of the stator, so that it is not necessary to consider the space for the circuit components mounted on the circuit board separately from the stator. Is substantially absorbed within the thickness of the stator, so that the motor can be easily made thinner. In addition, the rotor R can always generate a one-way rotational driving force without sacrificing the thickness of the core, the coil and the like in reducing the thickness, so that an efficient motor can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part of a radial gap type fan motor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part of the radial gap type fan motor in FIG. FIG. 3 is a longitudinal sectional view of an essential part of an axial gap type fan motor according to another embodiment of the present invention. FIG. 4 is a cross-sectional view of a main part of the axial gap type fan motor in FIG. 4; FIG. 5 is a sectional view of a main part of a conventional fan motor. [Description of Signs] 1,11,21 {shaft 4} cores 6,16,26 {rotor yokes 7,17,27} field magnets 8,18,28 {impeller 10} circuit parts 15} ‥ Air core coil R ‥‥ Rotor S ‥‥ Stator

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 29/00 H02K 1/14 H02K 21/22 H02K 21/24 H02K 7/14

Claims (1)

(57) [Claims] [Claim 1] 90 ° deviated to one side when viewed from a plane
A scan <br/> stator subjected to the armature coil core having a two-pole salient pole at intervals, wear is faced with a predetermined gap to said stator
The磁開angle consists of a rotor having a field magnet that is radially air-gap type by 90 °, the circuit components are mounted in the space formed in the remaining angle portion of the 90 degrees to the stator, wherein The rotor has an integral
A fan motor characterized in that a prop is formed .