JP2711718B2 - Blower - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blower mainly used for a vehicle air conditioner.

(Prior Art) In this type of blower, a DC brushless motor is mainly used. For example, a blower in which an annular field magnet (permanent magnet) constituting a rotor of the motor and a fan are integrally provided is well known. (See, for example, Japanese Utility Model Laid-Open No. 63-285297).

The fan is generally formed by injection-molding an impeller, a boss portion, and a connecting portion connecting the former with a resin material, specifically, polyethylene, polypropylene, or the like, and the field magnet is mounted in a groove provided in the connecting portion, for example. I was

(Problems to be Solved by the Invention) It is well known that resins such as polyethylene and polypropylene have a large expansion and contraction due to a change in temperature, that is, a large coefficient of linear expansion, and a large deformation when a load is applied. As described in the above-described conventional example, in a fan in which a field magnet is attached to a fan formed of resin or the like, the positional relationship between the field magnet and the stator (armature) is displaced due to deformation of the fan. Are irregular in the circumferential direction, which lowers the function of the blower.

Therefore, an object of the present invention is to provide a blower which solves the above-mentioned problems and operates stably.

(Means for Solving the Problems) In order to achieve the above object, a blower according to the present invention includes a casing, an armature housed in the casing and wound with an exciting coil, and housed in the casing. An exciting circuit that energizes the exciting coil so that the armature generates a rotating magnetic field, a rotating shaft that penetrates the armature and is rotatably held by the casing, and fixed to the rotating shaft. In a blower including at least a fan, the fan includes a boss portion fixed to one end of the rotating shaft, a reinforcing member extending from the boss portion to a portion facing the armature, and an outer portion of the reinforcing member. An impeller mounted on the outer periphery and a field magnet disposed on the inner side of the outer periphery of the reinforcing member and facing the armature, wherein the reinforcing member is integrated with the boss portion and the impeller. Molded into Along with
It is to be formed of a material having high magnetic permeability.

(Operation) Therefore, the fan impeller integrally forms the boss portion and the reinforcing material, and expands and contracts between the boss portion and the impeller due to a change in temperature, that is, a large linear expansion coefficient and a load is applied. By using the reinforcing material at the portion where the deformation is greatest, the deformation of the fan can be suppressed, and the field magnet can be attached to the reinforcing material to maintain a constant positional relationship with the armature. Can be solved. In addition, since the reinforcing member is formed of a material having a high magnetic permeability, the reinforcing member also functions as a back yoke, so that a leakage magnetic flux can be suppressed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2, the blower 1 has an armature 2 in the center, a fan 3 above the armature 2 and a printed circuit board 4 below.

The armature 2 is, for example, an iron core formed by stacking silicon steel plates in multiple stages.
The coil 2b is formed into a multi-phase winding such as a three-phase winding in the slot 2a, and is pressed into the casing 5 and fixed.
In the armature 2, the coils 2 b of the respective phases are appropriately energized to an excitation circuit of a printed circuit board 4 described later to generate a rotating magnetic field for the fan 3.

The casing 5 that accommodates the armature 2 is screwed so as to align the peripheral edge with the bottom plate 6 arranged below, and the printed board 4 described below is screwed below the armature 2. A hole 5a for passing the casing 7 for supplying power to the printed circuit board 4 is formed on the side of the casing 5, and mounting brackets 5b, 5b for fixing the blower 1 are provided at two locations on the outer periphery. Have been.

The printed circuit board 4 is provided with an excitation circuit (not shown) for exciting the above-described armature 2, and a magnetic pole position of a permanent magnet 14 fixed to a shaft 12, which will be described later, is set on the printed circuit board 4, for example. The coil 2b of each phase of the armature 2 is sequentially and alternately energized with a predetermined phase difference based on the detection signal.

The fan 3 has an impeller 8 and a boss portion 9 made of resin or the like, which are integrally formed by disposing a reinforcing member 10 at a connecting portion connecting them, and a groove provided inside the reinforcing member 10.
An annular field magnet (permanent magnet) 11 is arranged in 10a, and a shaft 12 pressed into the boss 9 is supported by bearings 13a and 13b arranged on the casing 5 and the bottom plate 6, and is locked by a washer 12a. It is provided rotatably. The reinforcing member 10 is formed of, for example, a metal having a relatively high magnetic permeability,
Above it, holes 10c for holding the boss 9 and holes 10b for holding the impeller 8 in the vicinity of the center are formed at four equally spaced locations in the circumferential direction. The impeller 8 and the boss 9 are
The resin is injected into a mold provided with 10 and injection-molded, and at the time of molding, projections 8a and 9a which are locked in holes 10b and 10c of the reinforcing material 10 are formed, and are held by the reinforcing material 10. ing. On the other hand, the field magnet 11 has magnetic poles alternately magnetized in the circumferential direction, is housed in the groove 10a of the reinforcing member 10 so as to face the armature 2, and is fixed with an adhesive or the like.

An annular permanent magnet 14 magnetized similarly to the field magnet 11 is fixed below the shaft 12, and the Hall element 4a detects the magnetic pole position of the permanent magnet 14, thereby Magnetic pole detection corresponding to the magnetic pole position of the field magnet 11 can be performed.

The blower 1 configured as described above constitutes a DC brushless motor having the fan 3 as the rotor and the armature 2 as the stator, and the coil of each phase of the armature 2 based on the magnetic pole position of the field magnet 11 of the fan 3. 2b is alternately energized, thereby generating a rotating magnetic field of the field magnet 11 and operating as a blower for rotating the impeller 8.

In this blower 1, the fan 3 is formed by integrally forming the reinforcing member 10 at the connecting portion where the impeller 8 and the boss portion 9 connect them.
, The deformation due to a temperature change or the like can be suppressed. At the same time, the field magnet 11 is disposed in the reinforcing member 10 so that the positional relationship with the armature 2 is always kept constant.

Also, since the reinforcing material 10 was molded from a metal having high magnetic permeability,
Since the reinforcing member 10 also serves as the back yoke of the field magnet 11, the leakage magnetic flux can be suppressed.

(Effects of the Invention) As described above, according to the present invention, since the reinforcing member is integrally formed at the connection portion connecting the impeller of the fan and the boss portion, deformation of the fan due to heat change or the like is suppressed. In addition, since the field magnet is attached to the reinforcing member, the positional relationship between the field magnet and the armature is always kept constant, and the blower can operate stably. Further, since the reinforcing material is formed of a metal having a high magnetic permeability, the reinforcing material also functions as a back yoke of the field magnet, so that a leakage magnetic flux can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a blower according to an embodiment of the present invention, and FIG.
The figure is a schematic exploded perspective view of the same. 1 Blower, 2 Armature, 3 Fan, 4 Printed Circuit Board, 8 Impeller, 9 Boss, 10 Reinforcement, 11 Field Magnet, 12 Shaft .

Claims (1)

(57) [Claims] 1. A casing, an armature housed in the casing and having an exciting coil wound thereon, and an energizing coil housed in the casing and energizing the exciting coil such that the armature generates a rotating magnetic field. An exciter circuit, a blower that penetrates the armature and is rotatably held by the casing, and a blower that is fixed to the rotary shaft, wherein the fan is provided at one end of the rotary shaft. A boss portion to be fixed, a reinforcing member extending from the boss portion to a portion facing the armature, an impeller mounted on an outer peripheral edge of the reinforcing member, and an inner peripheral edge of the reinforcing member. And a field magnet disposed at a portion facing the armature, wherein the reinforcing member is formed integrally with the boss portion and the impeller, and is formed of a material having high magnetic permeability. Bro .