JP2001132697A - Motor fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and effectively cool a control electronic part of a motor for driving a motor fan. SOLUTION: This motor fan has a centrifugal blade type impeller driven by a motor and a control circuit integrally and fixedly arranged with the motor for controlling rotation of the motor, a casing for constituting the motor is integrally provided with an installing part of the control circuit, and a heat sink of a heating electronic part for constituting the control circuit is formed or juxtaposed in the installing part vicinity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor fan having a centrifugal impeller, and more particularly to a motor fan which needs to consider a rise in temperature of a driving motor including a control circuit.

[0002]

2. Description of the Related Art FIG. 4 shows a centrifugal impeller 2-1 attached to an output shaft 1-11 of a motor 1-1 driven by a control circuit 3-1.
1 is a schematic cross-sectional view of an example of a well-known double-headed motor fan 1 in which the motor fan 1 is connected and held.

[0003] The motor fan 1 has a housing 1-12 which is a connecting member of a motor 1-1 and a fan case 2-2 accommodating a centrifugal impeller 2-1. A centrifugal impeller 2-1 is fixedly held on an output shaft 1-11, which extends through the center hole of the fan case 2-2 into the fan case 2-2.

The housing 1-12 is formed of a metal member such as aluminum die casting, and serves as a heat radiating means for an electronic component 3-11 constituting a control circuit 3-1 for driving the motor 1-1. An example utilizing body 1-12 is also known.

That is, among the electronic components 3-11 constituting the control circuit 3-1, those which generate a large amount of heat are transferred to the casing 1-12.
Is fixed so as to be in contact with the motor fan 1 so as to suppress the temperature rise of the drive unit itself of the motor fan 1 for the purpose of cooling.

[0006]

In the conventional structure as described above, since the cooling effect of the electronic components depends on the ambient conditions such as the indoor environment outside the motor fan, it is desired to realize more effective cooling means. I was

[0007]

SUMMARY OF THE INVENTION A motor fan according to the present invention comprises a centrifugal impeller, a motor, and a control circuit fixedly provided with the motor for controlling the rotation of the motor. A housing constituting the motor, integrally including a mounting portion for the control circuit, and forming or disposing a heat sink for heat-generating electronic components configuring the control circuit in the vicinity of the mounting portion. It is configured.

[0008]

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

FIG. 1 is a sectional view of a main part of a first embodiment according to the present invention, and FIG. 2 is a schematic view taken along the arrow of FIG. As is clear from comparison with FIG. 4 of the above-described prior art example, the housing 1-12 constituting the outer cover of the motor 1-1 has a bottom surface 1-124 on which the control circuit 3-1 is disposed, A well-known rib-shaped heat sink 1-125 is integrally formed.

In this embodiment, the housing 1-12 itself is made of a metal member having excellent thermal conductivity such as aluminum die cast. As a means for increasing the heat radiation area for enhancing the heat radiation effect, a heat generating component 3-1 constituting the control circuit 3-1 is used.
In the vicinity of the portion on which the heat sink 1 is mounted, rib-shaped unevenness is integrally formed as a heat sink 1-125. FIG. 2 is a view of the heat sink of the example as viewed from the arrow in FIG.

FIG. 3 is a sectional view of a main part of a second embodiment of the present invention, in which the heat sink of the first embodiment is used as a separate heat dissipation member, and is formed as a separate heat sink 3-13.
It is configured to be fixedly disposed near a portion where the heat-generating electronic component 3-11 constituting the control circuit 3-1 is mounted.

In this example, the housing itself, which forms the motor casing formed by resin molding, is employed with a disadvantageous structure in terms of thermal conductivity.

[0013]

The motor fan according to the present invention can effectively cool electronic components arranged for controlling the motor with a simple structure excellent in handleability.

[Brief description of the drawings]

FIG. 1 is a sectional essential view of a first example according to the present invention.

FIG. 2 is an arrow view of the example of FIG. 1;

FIG. 3 is a sectional essential view of a second example according to the present invention.

FIG. 4 is a cross-sectional view of a prior art.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 (double-headed) motor fan 1-1 Motor 1-11 Output shaft 1-12 Housing 1-124 Bottom 1-125 Heat sink (integrally formed with housing) 2-1 Centrifugal impeller 2-2 Fan Case 3-1 Control circuit 3-11 Heating electronic components

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H022 AA02 BA07 CA50 DA03 3H034 AA02 BB02 BB06 CC07 DD00 EE03 3H035 AA01 AA06 5H609 BB15 PP01 PP16 QQ02 QQ13 QQ23 RR03 RR11 RR16 RR22 RR32 RR42 RR63 RR67

Claims (2)

[Claims] 1. A motor fan comprising an impeller, a motor for driving the impeller, and a control circuit fixedly provided integrally with the motor for controlling rotation of the motor. A motor fan, wherein the housing integrally includes a mounting portion for the control circuit, and a vicinity of the mounting portion forms a heat sink for heat-generating electronic components constituting the control circuit. 2. The motor fan according to claim 1, wherein a rib-shaped heat sink is provided in parallel as a heat radiating means near the control circuit mounting portion.