JPH0442750A - Supporting structure for fan - Google Patents

Abstract

PURPOSE:To support a fan accurately and to prevent production of abnormal noise or motor lock by disposing means for supporting the fan on a rotor between the outer circumference of rotor and the inner circumference of a fan coupling part. CONSTITUTION:Predetermined number of ribs 46 are planted, with predetermined intervals, on the inner circumference of the coupling part 45 of a fan 3. Length between the root and the tip of the rib 46 is set longer than the gap (a) between the fan 3 and the yoke 28 of a rotor 7. The fan 3 is constructed such that it is pressure fitted to the yoke 28 of the rotor 7 through the plurality of rib 46 planted on the inner circumference. Consequently, the fan 3 is supported accurately on the rotor 7. Furthermore, the fan 3 does not vibrate nor the motor is locked.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention mainly relates to a blower used in a vehicle air conditioner,
Especially regarding the support structure of the fan.

(Prior Art) In general, the fan of this type of blower is rotatably provided with its center of rotation fixed to the rotating shaft of a motor.
For example, see Japanese Unexamined Patent Publication No. 57-148554).

(Problem to be solved by the invention) However, the fan installed as described above,
Only the center of rotation is fixed to the rotating shaft of the motor; the other parts are not supported, and there is a gap between the rotation center and the motor. If the fan is deformed, the fan will vibrate during rotation, causing abnormal noise, etc.
In the worst case, the motor may lock up.

Therefore, in view of the above-mentioned problems, this invention provides a fan support structure for a blower that accurately supports the fan to prevent problems such as abnormal noise and motor locking, and improves the performance of the blower. The purpose is to provide.

(Means for Solving the Problems) In order to achieve the above object, a support structure for a blower fan according to the present invention includes a rotor having a field magnet and rotatably provided, and a rotor that rotates with respect to the rotor. A blower comprising: a motor having an armature that generates a magnetic field; and excitation means that excites the armature; and a fan rotatably fixed to a rotating shaft of the motor. Supporting means for supporting the fan on the rotor is provided between the outer periphery of the fan and the inner periphery of the connecting portion of the fan.

(Function) Therefore, since the fan is supported by the rotor via the support means, no misalignment occurs between the fan and the motor, thereby making it possible to solve the above problem.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

An example of a blower is shown in FIG. 1, and the blower basically consists of a motor 1 and a sirocco-type fan 3. As shown in FIG.

The motor 1 is composed of, for example, a DC brushless motor, and has an armature (stator) 5 in the center, a rotor 7 above the armature 5, and a printed circuit board 9 below. .

The armature 5 includes an iron core 1 formed by laminating silicon steel plates in multiple stages, for example.
A storage case 14 for a printed circuit board 9, which is configured by winding a coil 12 in a three-phase or other multi-layered manner in a slot of 0, as described below.
The sleeve 16 is press-fitted and fixed. This armature 5 has coils 12 for each phase connected to a printed circuit board 9.
The excitation circuit is appropriately energized to generate a rotating magnetic field for the rotor.

The storage case 14 is screwed to a lid plate 18 disposed below the lid plate 18 along its periphery, and a printed circuit board 9 described below is screwed to the inside thereof, and a cable 20 for supplying power to the printed circuit board 9 is passed through. A through hole 22 is formed on the side. Moreover, mounting brackets 24 for fixing the motor 1 to the outside are provided at three locations on the outer periphery.

An excitation circuit (not shown) that excites the armature 5 described above is formed on the printed circuit board 9, and an excitation circuit (not shown) that excites the armature 5 described above is formed on the printed circuit board 9.
The position of the magnetic pole of the permanent magnet 40 fixed on the armature is detected by, for example, a predetermined number of ball elements 26 mounted on the printed circuit board 9, and the coils 12 of each phase of the armature 5 are detected based on the detection signal.
are sequentially and alternately energized with a predetermined phase difference.

The rotor 7 includes a yoke 28 made of a magnetic material and an annular field magnet (permanent magnet) 30. York 28
has a boss portion 32 at its center, and a rotating shaft 34 press-fitted into the boss portion 32 has bearings 36 disposed at both ends of the sleeve 16,
36, and is rotatably secured by a stop ring 3838. The field magnet 30 is, for example, one in which magnetic poles are alternately magnetized in the circumferential direction, and is fixed to the inside of the yoke 28 with an adhesive or the like, so that the yoke 28 suppresses leakage magnetic flux. It has become. Note that an annular permanent magnet 40 magnetized in the same way as the field magnet 30 is fixed below the rotating shaft 34.
The aforementioned Hall element 26 detects the magnetic pole position of the permanent magnet 40, thereby enabling magnetic pole detection corresponding to the magnetic pole position of the field magnet 30 to be performed.

The fan 3 is made of, for example, synthetic resin,
A boss portion 42 provided at the center of rotation is press-fitted into the tip of the rotating shaft 34 of the motor 1, and is secured by a stop ring 44 so as to be freely rotatable. As shown in detail in FIGS. 2 and 3, a predetermined number of ribs 46 are protruded from the inner periphery of the connecting portion 45 of the fan 3 at equal intervals. The length from the base to the tip of the rib 46 is longer than the width a of the gap between the fan 3 and the yoke 28 of the rotor 7. That is, fan 3 is
Via a plurality of ribs 46 provided on the inner peripheral surface (rib 4
6) is lightly press-fitted into the yoke 28 of the rotor 7 by slightly crushing the tip of the rotor 7 when the tip is fitted onto the yoke 28 of the rotor 7. Thereby, the fan 3 is accurately supported rotor-toughly.

In the blower having such a configuration, the coils 12 of each phase of the armature 5 are alternately energized based on the magnetic pole position of the field magnet 30 of the rotor 7, thereby generating a rotating magnetic field around the field magnet 30 of the rotor 7. The rotor 7 is rotated, that is, the fan 3 is rotated. This blower is disposed, for example, in a blower case of a vehicle air conditioner (not shown), and is used to blow air taken in from an inside air or outside air intake port toward a heat exchanger placed on the downstream side.

In this blower fan support structure, the fan 3 is lightly press-fitted into the rotor 7 via a plurality of ribs 46 provided on the inner circumferential surface of the connecting portion 45, and is supported by the rotor 7. As a result, the fan 3 is properly supported so that no misalignment occurs between the fan 3 and the rotor 7. As a result, the fan 3 does not shake as in the conventional case (and the motor does not lock).

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 to 6. However, those having the same configuration as those of the first embodiment described above are given the same reference numerals, and the explanation thereof will be omitted, and only the different points will be explained below.

The difference between the support structure of the fan according to this embodiment and the one described above is that the outer circumference of the yoke 28 of the rotor 7 has a thickness of 0.5 m.
Low hardness materials (e.g. double-sided tape, resin coat,
The fan 3 is lightly press-fitted (externally fitted) through the ribs 46 into the yoke 28 to which the low-hardness material 48 is attached. Here, rib 4 of fan 3
The length from the base to the tip of 6 is set to such an extent that the low hardness material 48 is depressed by being pressed with a predetermined force, as shown in FIG.

Therefore, this fan support structure can accurately support the fan 3 in a rotor-tough manner, and has the same effect as the first embodiment described above, while also reducing the vibration of the fan 3. It can be absorbed by the hard material 48.

(Effects of the Invention) As described above, according to the present invention, since the fan is supported by the rotor, there is no vibration in the fan or the fan locks the motor unlike in the past. In addition, the strength of the fan against external forces can be increased, and a blower with high reliability can be provided.

In addition, since the fan is designed to fit around the outer circumference of the rotor, the fan acts as a damper for abnormal noise caused by the reaction force between the armature (stator) and the field magnet of the rotor when switching the motor's excitation circuit. One example is that it can be suppressed.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a blower according to a first embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1 showing the support structure of the fan, and Fig. 3 shows the fan and rotor from the printed circuit board side. 4 is an enlarged view of the main parts of the fan support structure of the blower according to the second embodiment, and FIG. 5 is a detailed view of the main parts as seen from the printed circuit board side. A detailed view of the main part, FIG. 6 is an enlarged view of a part of the main part of FIG. 1... Motor, 3... Fan, 5... Armature, 7
... Rotor, 9... Printed circuit board, 28.0. Yoke, 30... Field magnet, 34... Rotating shaft, 45. .・Connection part, 46... Rib, 4th...Low hardness material. Figure 1

Claims (1)

[Claims] A motor comprising a rotor that is rotatably provided with a field magnet, an armature that generates a rotating magnetic field with respect to the rotor, and excitation means that excites the armature, and a rotating shaft of the motor. In a blower comprising a fan rotatably fixed to the rotor, support means for supporting the fan on the rotor is provided between the outer periphery of the rotor and the inner periphery of the connection part of the fan. A blower fan support structure featuring: