JPH11294837A - Brushless fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brushless fan motor which can raise the fan efficiency, with a suitable ventilation path constituted, and can downsize the device, and reduce the noise, too, and can raise the response speed and response accuracy of a temperature sensor. SOLUTION: For a brushless fan motor 10, a stator mounting board 30 is caught by a housing 12 and a yoke 14, and a ventilation path 20 is constituted, and a rotary fan 22 is accommodated. A coil 32 for giving a rotating magnetic field to the rotor magnet 28 of the rotary fan 22, and other drive circuit elements are mounted on the opposite face from the ventilation path 20 (rotor magnet 28) of a stator mounting board 30. Moreover, a thermistor 36 is attached to the stator mounting board 30 in the vicinity of a discharge port. Accordingly, a suitable ventilation path 20 is constituted, and the fan efficiency improves, and the response speed and response accuracy of the thermistor 36 improve, too.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless fan motor, and more particularly to a brushless fan motor suitable for use as a blower (ventilator) for a temperature detection sensor in a vehicle interior in an automatic air conditioner for a vehicle or the like.

[0002]

2. Description of the Related Art Brushless fan motors are used in various fields. For example, brushless fan motors are widely used as air blowers (ventilators) for temperature detection sensors in vehicle interiors in auto air conditioners for vehicles and the like.

[0003] This type of brushless fan motor has a casing. The casing is formed in a spiral shape as a whole, and a ventilation path is formed between the inlet and the outlet. A rotating fan (rotor) integrally including a rotor magnet is rotatably accommodated in the casing (ventilation path). Also, on the side of the ventilation path,
A coil (stator armature) for applying a rotating magnetic field to the rotor magnet of the rotating fan is arranged. This coil is mounted on the stator mounting base,
This stator mounting base forms a part of the ventilation path.
Further, another motor drive circuit element is mounted on the stator mounting board. In this configuration, a rotating magnetic field is applied to the rotor magnet by the coil to rotate the rotating fan, whereby air can be sucked in from the suction port and discharged from the discharge port (for example, Japanese Patent Laid-Open No. 6-2923).
No. 45).

In this type of conventional brushless fan motor, the stator mounting base forms a part of the ventilation path, so that the number of parts can be reduced and the apparatus can be simplified, but on the other hand, the stator mounting The gap between the rotating fan and the stator mounting base (that is, the side wall of the ventilation path) is increased by the height of these coils and the motor drive circuit elements due to the coils and motor drive circuit elements mounted on the base ( There is a disadvantage that the fan efficiency is reduced. For this reason, in order to obtain a necessary air volume (wind speed), the size of the apparatus is increased. Furthermore, since these coils and the motor drive circuit elements hinder ventilation, noise increases.

In the case where such a brushless fan motor is applied as an inside air exhaust fan for a temperature detection sensor in a vehicle cabin, a temperature sensor (for example, a thermistor) is conventionally mounted near an air inlet. It is configured to automatically operate the rotating fan. However, in such a thermistor as a temperature sensor, the response speed and the response accuracy are affected by the wind speed around the position where the thermistor is disposed (since the response speed and the response accuracy are improved as the wind speed is higher), the suction port is different from the conventional one. If a temperature detection sensor was mounted near the air passage, the wind in the ventilation path could not be used effectively (it was difficult to improve the response speed and response accuracy), and the efficiency was poor.
Furthermore, some of the coils and other motor drive circuit elements mounted on the stator mounting board generate heat, and if the coil or motor drive circuit element is mounted on the ventilation path side, the temperature sensor will not be accurate. There is also a possibility that a malfunction (deterioration of responsiveness) may occur due to a failure to detect an outside air (room temperature).

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention can improve the fan efficiency by forming a suitable ventilation passage, thereby reducing the size of the apparatus and reducing the noise. It is another object of the present invention to provide a brushless fan motor capable of further improving the response speed and response accuracy of a temperature sensor.

[0007]

According to a first aspect of the present invention, there is provided a brushless fan motor having a case in which a ventilation path is formed between an intake port and an exhaust port, and a rotor magnet integrally formed in the case. A rotatable fan that is rotatably provided, rotates by an electromagnetic force applied to the rotor magnet, sucks air from the suction port, and discharges the air from the discharge port; and a rotating magnetic field for the rotor magnet. The stator armature to be provided, and the stator armature and the drive circuit element are mounted, and the side opposite to the stator armature and the drive circuit element mounting surface is arranged to face the rotor magnet. And a stator mounting base.

In the brushless fan motor according to the first aspect, an air passage is formed by the casing and the stator mounting base, and a rotary fan is rotatably provided in the air passage. When a rotating magnetic field is applied to the rotor magnet of the rotating fan by the stator armature, the rotating fan rotates, whereby air is sucked in from the suction port and discharged from the discharge port.

In this brushless fan motor, the stator mounting base, which forms a ventilation path together with the case, has a side opposite to the surface on which the stator armature and the drive circuit element are mounted facing the rotor magnet (the ventilation path). In other words, since the stator armature and the drive circuit element mounted on the stator mounting base do not face the ventilation path, the rotating fan and the stator mounting base (that is, the side wall of the ventilation path) are disposed. ) Can be minimized (there is no increase by the height of the stator armature and the drive circuit element). Therefore,
The fan efficiency is greatly improved as compared with the conventional case. Therefore, the required air volume (wind speed) can be obtained in a small shape (the device can be downsized). Further, since the stator armature and the drive circuit element mounted on the stator mounting base do not hinder ventilation, noise can be reduced.

As described above, in the brushless fan motor according to the first aspect of the present invention, a suitable ventilation passage is formed, and the fan efficiency can be improved, whereby the size of the apparatus can be reduced and noise can be reduced.

A brushless fan motor according to a second aspect of the present invention is the brushless fan motor according to the first aspect, wherein a temperature sensor for detecting the temperature of the discharged air is provided on the stator mounting base near the discharge port. It is characterized by:

In the brushless fan motor according to the second aspect, the temperature sensor is provided on the stator mounting base near the outlet of the ventilation path. That is, the temperature sensor is provided in a portion where the wind speed is fastest among the respective portions of the device. Further, the temperature sensor is located at a position separated from the stator armature and other drive circuit elements mounted on the stator mounting board, and furthermore, these stator armatures and other drive circuit elements are disposed in the ventilation path. Even if these stator armatures and other drive circuit elements include those that generate heat, the wind flowing through the ventilation passage is unlikely to be heated up (it is hardly affected by heat). .

Therefore, when, for example, a thermistor is used as the temperature sensor, the response speed and the response accuracy are improved. That is, the air in the ventilation path can be effectively used and the efficiency is improved, and the temperature sensor can accurately detect the temperature of the wind, thereby preventing malfunction.

[0014]

1 and 2 show an exploded perspective view of the overall structure of a brushless fan motor 10 according to an embodiment of the present invention. FIG. 3 shows the overall configuration of the brushless fan motor 10 in a longitudinal sectional view, and FIG. 4 shows the configuration of the brushless fan motor 10 in a front view.

The brushless fan motor 10 is applied as a blower (ventilator) for a temperature detection sensor in a vehicle or the like, for example, in an auto air conditioner.

The brushless fan motor 10 has a housing 12 and a yoke 14 as a case. The housing 12 is formed in a scroll shape (spiral shape) as a whole, and has a suction port 16 on the front side and a discharge port 18 on a corner portion.
A ventilation path 20 is formed between the inlet 16 and the outlet 18.

A rotating fan 22 is housed in the housing 12 (air passage 20). The rotating fan 22 has a rotating shaft 24 rotatably supported by the yoke 14 via a bearing 26, and a rotor magnet 28 is integrally provided on the bottom surface on the yoke 14 side.

A stator mounting base 30 is disposed on the side of the ventilation passage 20 so as to face the rotor magnet 28 of the rotary fan 22. This stator mounting base 30
Is sandwiched and fixed by the housing 12 and the yoke 14, thereby constituting a part of the ventilation passage 20 (in other words, the ventilation passage 20 is constituted by the housing 12 and the stator mounting base 30). ing).

A coil 32 as a stator armature for applying a rotating magnetic field to the rotor magnet 28 of the rotating fan 22 and another motor drive circuit element 33 are mounted on the stator mounting base 30. here,
These coils 32 and other drive circuit elements 33 are mounted on the surface of the stator mounting base 30 opposite to the rotating fan 22 (rotor magnet 28) (that is, the surface on the yoke 14 side). Therefore, these coils 32 and other motor drive circuit elements 33 are arranged so as not to protrude (expose) into the ventilation path 20 formed by the stator mounting base 30. The rotating magnetic field is applied to the rotor magnet 28 by the coil 32 to rotate the rotary fan 22, whereby air can be sucked in from the inlet 16 and air can be discharged from the outlet 18.

Further, the yoke 14 facing the coil 32 is provided with an insert iron plate 34 as a magnetic member. As shown in FIG.
Numeral 4 is integrally embedded in the yoke 14 by insert molding, and is located opposite the coil 32. Thus, the insert iron plate 34 forms a part of a magnetic circuit together with the coil 32 when the rotating fan 22 rotates, and the stopped state of the rotating fan 22 due to the attraction or repulsion with the rotor magnet 28 when the rotating fan 22 is stopped. Can be held.

On the other hand, a thermistor 36 as a temperature sensor is mounted on the stator mounting base 30 near the discharge port 18. This thermistor 36 can detect the temperature of the discharged air. The thermistor 36
On both sides, that is, upstream and downstream of the relative airflow,
A pair of columns 38 are provided. The strut 38 is formed integrally with the yoke 14 so that the thermistor 36 can be prevented from falling down.

Further, a connector terminal 40 is mounted on one end of the stator mounting base 30. The connector terminal 40 extends into a connector 42 provided integrally with the yoke 14. An external connector (not shown) is fitted into the connector section 42 and connected to an electric circuit section (not shown) of the vehicle. Next, the operation of the present embodiment will be described.

In the brushless fan motor 10 having the above-described configuration, the housing 12 and the stator mounting base 30 form the ventilation passage 20, and the rotating fan 2 is provided in the ventilation passage 20.
2 is provided rotatably. When a rotating magnetic field is applied to the rotor magnet 28 of the rotating fan 22 by the coil 32, the rotating fan 22 rotates, whereby air is sucked from the inlet 16 and air is discharged from the outlet 18.

Here, the brushless fan motor 10
Then, the stator mounting base 30 that forms the ventilation path 20 together with the housing 12 includes a coil 32 and a drive circuit element 33.
Since the side opposite to the surface on which is mounted is disposed facing the rotor magnet 28 (as a side wall of the ventilation passage 20), in other words, the coil 32 and the drive circuit element 33 mounted on the stator mounting base 30 are Since it does not face the ventilation passage 20, the rotating fan 22 and the stator mounting base 30
(That is, the side wall of the ventilation path 20) can be minimized (there is no increase by the height of the coil 32 and the drive circuit element 33). Therefore, the fan efficiency is greatly improved as compared with the related art. Therefore, the required air volume (wind speed) can be obtained in a small shape (the device can be downsized). Furthermore, since the coil 32 and the drive circuit element 33 mounted on the stator mounting base 30 do not hinder ventilation, noise can be reduced.

Further, in the brushless fan motor 10, a thermistor 36 is provided on the stator mounting base 30 near the discharge port 18 of the ventilation path 20. That is, the thermistor 36 is provided at a portion where the wind speed is fastest among the components of the apparatus. Further, the thermistor 36 is disposed at a position separated from the coil 32 and other drive circuit elements 33 mounted on the stator mounting base 30, and these coils 32 and other drive circuit elements 33 are connected to the ventilation path. These coils 3
Even if the heat-generating elements 2 and other driving circuit elements 33 include heat-generating elements, the wind flowing through the ventilation path 20 is unlikely to rise in temperature (is hardly affected by heat). Accordingly, the response speed and response accuracy of the thermistor 36 are improved. That is, the wind in the ventilation passage 20 can be effectively used and the efficiency is improved, and the thermistor 36 can accurately detect the temperature of the wind, thereby preventing malfunction.

As described above, in the brushless fan motor 10 according to the present embodiment, a suitable ventilation passage 20 is formed, so that the fan efficiency can be improved, whereby the device can be downsized and the noise can be reduced. In addition, the response speed and response accuracy of the thermistor 36 can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an overall configuration of a brushless fan motor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the overall configuration of the brushless fan motor according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing an overall configuration of the brushless fan motor according to the embodiment of the present invention.

FIG. 4 is a front view showing the overall configuration of the brushless fan motor according to the embodiment of the present invention.

FIG. 5 is a front view showing a configuration of the brushless fan motor according to the embodiment of the present invention, in a state where a stator mounting base is mounted on a yoke.

[Explanation of symbols]

 Reference Signs List 10 brushless fan motor 12 housing (case) 14 yoke (case) 16 suction port 18 discharge port 20 ventilation passage 22 rotating fan 28 rotor magnet 30 stator mounting base 32 coil (stator armature) 33 drive circuit element 36 thermistor (temperature sensor)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02K 29/00 H02K 11/00 X

Claims (2)

[Claims] 1. A case in which a ventilation path is formed between an inlet and an outlet, and a rotor magnet integrally provided and rotatably provided in the case, and provided by an electromagnetic force applied to the rotor magnet. A rotating fan that rotates to suck air from the suction port and discharges the air from the discharge port; a stator armature that applies a rotating magnetic field to the rotor magnet; and the stator armature and the drive circuit element. A brushless fan motor comprising: a stator mounting base mounted and having a side opposite to the stator armature and the drive circuit element mounting surface facing the rotor magnet, the stator mounting base constituting the ventilation path together with the case. 2. The brushless fan motor according to claim 1, wherein a temperature sensor for detecting a temperature of the discharged air is provided on the stator mounting base near the discharge port.