JPS61265385A - Fan - Google Patents

Abstract

PURPOSE:To improve the cooling effect for a motor by integrally supporting the stator of an external revolution type motor for revolving a fan onto a supporting shaft projectingly installed onto a supporting plate thermally integrally and transmitting the heat of a stator winding onto the supporting plate through the supporting shaft. CONSTITUTION:A fan 29 installed integrally onto a rotor 28 is revolved by the drive of a motor 21, and the prescribed ventilation in performed. The heat generated in a stator 22 winding is transmitted to a supporting plate 19 from a supporting shaft 20 which supports the stator 22 and projects thermally integrally from the supporting plate 19 supported onto a body stand 39. The motor 21 is cooled by the supporting plate 19 as cooling fins. At this time, the cooling of the motor 21 is accelerated furthermore by allowing the supporting plate 19 to be applied with the influence of the wind generated by the revolution of the fan 29. Therefore, the cooling effect of the motor 21 is improved exceedingly, and reliability is improved, and the manufacture of small-sized and lightweight fan through cost cut is permitted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electric fan.

[Conventional technology]

Conventionally, as shown in Japanese Unexamined Patent Publication No. 59-145397, for example, in an electric fan, a blowing motor is supported on a support member supported by a main body stand, and the fan is attached to the rotating shaft of the motor. At the same time, a guard that covers the fan is integrally supported on the front surface of the motor, and a cover on the outside of the motor is also integrally supported by the motor.

To explain this type of conventional mechanism in more detail, as shown in FIG. 9, a motor (1) supported by a main body stand is
The stator (
3), a shaft (5) rotatably supported on the front and rear walls of the bracket (2) via a bearing (4), and a shaft (5) rotatably supported on the front and rear walls of the bracket (2).
The fan boss (8) of the fan (7) is fitted into the front end of the shaft (5) and extends through the shaft (5). pin(
The fan (7) is positioned integrally with the shaft (5) by screwing the screw 01) of the spinner 00 into the screw hole at the front end of the shaft (5).

Furthermore, on the front side of the motor bracket (2), there is a first cosmetic case Q3 made of synthetic resin having a threaded cylinder part α in the center.
Rear guard 1. is fixed to the threaded cylinder part @ and covers the rear surface of the fan (7). After fitting L4), the guard Q4) is fixed by screwing the nut αυ onto it, and the motor (
2) A second cosmetic case 1.1 made of synthetic resin that serves as a cover
* is fitted and attached to the periphery of the first cosmetic case OQ.

[Problem that the invention seeks to solve]

However, with the above-mentioned configuration, the motor (1) is made of a resin first motor. Since the second decorative case α3 is covered with CIQ, heat dissipation, that is, cooling, of the motor (1) is not performed well, and the temperature rise of the stator winding becomes extremely high, reducing the performance and reliability of the motor (1). Therefore, it is necessary to take measures such as increasing the amount of copper in the stator winding to increase the heat capacity, which results in the motor (1) becoming larger and heavier, resulting in an increase in cost.

Therefore, in order to eliminate the above-mentioned drawbacks, it is a technical object of the present invention to provide a means for effectively cooling the stator winding, that is, the stator, which is a cause of heat generation in the motor.

[Means for Solving the Problems] The electric fan of the present invention has a support shaft that thermally protrudes integrally with a support plate supported by a main body stand, and a stator in the center that is integrated with the support shaft. The motor is characterized by comprising an external rotor type motor supported by a rotor, and a fan integrally attached to a rotor on the outer periphery of the motor.

[Effect]

Therefore, in the electric fan of the present invention configured as described above, the fan integrally attached to the rotor is rotated by the drive of the motor, and a predetermined air is blown. Heat is transferred from the support shaft supporting the stator to the support plate, and the support plate acts as a heat radiation fin to cool the motor. At this time, the cooling of the motor is of course promoted by the support plate being affected by the wind generated by the rotation of the fan, but if the support plate is joined to the rear guard on the back of the fan, the cooling effect will be much greater. improves.

〔Example〕

Next, the present invention will be explained in detail with reference to FIGS. 1 to 8 showing embodiments thereof.

(First Example) First, FIGS. 1 to 5 showing the first example will be described.

In these drawings, αη is an L-shaped mounting plate that is rotatably supported on the main body stand (not shown) via a support α on the horizontal wall, and α is an L-shaped mounting plate that is rotatably supported on the main body stand (not shown), and Large-diameter disk-shaped support plate screwed, (1) is support plate C1
It is a cylindrical support shaft that is thermally protruded integrally from the front surface of the central part of the support plate α1 and the support shaft (A) are made of a metal material with good thermal conductivity.

I21) is an external rotation type ventilation motor such as a brushless motor supported by a support shaft (1), and has a stator (support) and stator winding @ integrated on the outer periphery of the support shaft, and a support shaft (1). A shaft (E) in the longitudinal direction that is rotatably supported inside via a bearing (X) and has a screw hole (C) at the front end, and an outer wall of the motor f21) that is integrally supported by the shaft (C). The rotor consists of a yoke (5), which is fixed to the inner peripheral surface of the yoke (5), and a rotor made of a magnet, which is located outside the stator.

After housing the motor Q1 in the fan boss ■ in the center, the rotor of the motor (21) is secured by tightening the screw of the spinner (31) into the screw hole of the shaft (4). The fan C3) is integrally attached to the fan via the yoke (C), and C3) is a rear guard that covers the rear surface of the fan.
The rear guard (33) is removably attached to the rear guard (33), which covers the front surface of the fan.

In addition, Fig. 5 shows the drive circuit of the motor (21), and (g) is a DC 8-8
Switching power supply that outputs a 5V motor drive power supply and a C5V control power supply, (36U), (36V)
, (86W) id Three position detection elements that detect the position of the rotor iron of motor 01), 07) detects the temperature detected from each detection element (360), (36V), (36W).
A gate circuit that outputs control output signals for driving each stator winding (a) of U, V, and W phases according to the signal inputted manually.
6V).

(36W) and the gate circuit (37) are driven by control power from the power supply (to).

(Ql) to (Q6) are PNP type switching first to
The base of each transistor is connected to the control output terminals (q+) to (q6) of the gate circuit 6η, and is turned on and off by the control output signal from each terminal (CI + ) to (q6). controlled. The emitters of each of the first to third transistors (Ql) to (Qa) are connected to a driving power supply terminal of the power supply section, and the first to third transistors (Ql) to (Qa) are connected to a driving power supply terminal of the power supply section. Second. The collectors of each of the third transistors (Ql), (Q2), and (Qa) are connected to the fourth transistor. Fifth. 6th transistor (Q4)
, (Q5).

(Qa), and
The collectors of the fourth to sixth transistors (Q4) to (Qa) are grounded, and the collectors of the first to sixth transistors (Q4) to (Qa) are grounded.
Third transistor (Ql), (Q2), (Qa)
The collectors of each are connected to the respective ends of the Y-connected stator windings of the B, V, and W phases.

Here, each transistor (Ql) to (Qa) is turned on.

The off state is controlled by the gate circuit 07) as the drive current flows through each stator winding @ in the order of ■ to ■.For example, in the case of ■, the first... The fifth transistor (Ql) and (Qa) are turned on, and the drive current from the switching power supply 13 is turned on.
Transistor (QQ, U-phase stator winding (c).

The V-phase stator winding @ flows through the fifth transistor (Q5), and in the case of ■, the first... Sixth transistor (Ql).

(Qa) is turned on, and then transistor (Ql) is turned on.
~(Qa) switches 9 and the drive current flows from ■ to ■, thereby generating a rotating magnetic field and causing the rotor (to) to rotate.

In addition, in the motor (to adjust the rotation speed at 2°C, switch the motor drive power supply 05 to 8 to 35 V).
This is done by changing.

In the electric fan configured as described above, when the rotor @ is rotated by the drive of the motor (C) and the fan holder integrated with the rotor rotates, the air behind the fan holder is sucked in and blown out to the front. Predetermined ventilation is performed, and at this time, the heat generated in the stator winding @ of the motor drive D is transferred from the stator @ to the support plate (6) via the support shaft (1), and the large diameter support plate 0 The scratches act as heat dissipation fins as they are affected by the rotation of the fan fins, and the heat from the motor 21) transferred to the support plate OI is also transferred to the rear guard connected to it. (33) also acts as a heat radiation fin, and the motor Q1) is effectively cooled.

By the way, in conventional electric fans, the fan is attached to the tip of the shaft that protrudes from the front of the motor, and a certain amount of space is left between the rear guard on the front of the motor and the fan at the tip of the shaft. Therefore, the protruding length of the shaft tends to be very long.

Therefore, due to the eccentricity of the shaft, the clearance between the outer diameter of the shaft and the inner diameter of the fan blades, etc., the deflection of the blades increases, resulting in large vibrations of the guard and the fan body.

However, in the case of the above embodiment, an external rotor type motor Q1) is used, and the motor (goods) is housed in the fan boss (2) of the fan holder, and the fan holder is directly supported by the outer periphery of the motor Cυ. Aya, the support shaft (a) of the support plate q9 is the motor t2N)
Since the stator (a) of the rotor (to) and the fan blade are supported through the shaft (4), the runout between the support shaft side and the fan blade is reduced, and the guard and main body This has the effect of significantly reducing vibration.

(Second Embodiment) Next, FIGS. 6 and 7 showing a second embodiment will be described.

In these drawings, the difference from the above is that the motor Cυ
, it is equipped with a oscillation function that allows the head of a fan such as a fan to oscillate from side to side.

In other words, the main body stand (
39) At the upper end, there is a mounting plate 1. The L motor is rotatably supported via the support α~ on the front part of the horizontal wall, and a support plate 09 is attached to the front wall of the mounting plate ad in the same manner as in the first embodiment.
．． Motor @1), fan (to) and rear guard (3)
I support 3). Furthermore, in the case of this embodiment, the mounting plate c
Fix the oscillating motor (4) to the rear of the horizontal wall of L, and attach the oscillating motor (4■, its shaft + 41) to the K oscillating 9 cam @ Uro, and the first bin (rotation) at the eccentric position of the cam (42). and the second pin (44) located at a position offset from the pillar α mark on the upper part of the main body stand 09) are connected by a swinging arm (4 yen. Note that (46) is attached to the base 138). Switches for changing the wind speed, etc., +471 are detachably attached to the rear guard (33) and are the front guard for the fan (A).

Therefore, when the fan blade is rotated by the drive of the blower motor 21), when the swinging motor (40) is driven,
By rotating the cam (42) via the shaft (41), the mounting plate α moves against the main body stand (39).
Motor e2 swings left and right around ■ and is supported by this.
]) and the fan swivel from side to side, and the wind from the fan sill is blown over a wide area.

Also, during this operation, the heat generated by the stator winding (C) of the blower motor ■υ is transferred from the fixed Q to the support shaft (C).
Heat is transferred to the support plate σ9 and the rear guard (33) through the motor 21), thereby cooling the motor 21).

Here, as mentioned above, if a high-efficiency motor such as a brushless motor is used as the blower motor 121), it can be made smaller and lighter than conventionally used capacitor motors, shaded motors, etc. By storing the motor (21) in the fan boss (1) of the fan, it becomes possible to integrate the motor (21) and the fan, which means that the fan can be made thinner.However, in the case of such a configuration, the weight balance tends to be lost. be.

However, in the embodiment described in item 1, a swinging motor (40) and a cam (40), an arm (a) Since a swinging mechanism such as 0 is provided, and a support supporting these is provided between the blower motor 21) and the swinging motor, the weight balance at the head of the fan is improved, making it compact and This makes it possible to provide a lightweight and stable electric fan.

(Third Example) Next, FIG. 8 showing a third example will be described.

In order to further enhance the cooling effect of the blower motor Q1), a large number of ribs (481) are protruded at equal intervals on the inner circumference of the fan boss (■) of the fourth fan, and the fan boss (to) The motor ■1) is housed in the interior, and the fan wire is integrally attached to the yoke arm of each rib (motor Q1 via the shaft), and a heat dissipation hole is installed between the outer circumferential surface of the motor QD and the inner circumferential surface of the fan boss ■. A space H9) is formed.

Therefore, the heat generated inside the motor Q core is grf
In the manner described above, heat is transferred from the stator (a) through the support shaft (1) to the support plate and rear guard (3 (6)) and radiated, and furthermore, the heat from the motor slope is transferred from the outer peripheral surface of the motor 12N for heat radiation. Heat is radiated to the space (49), and the cooling effect of the motor (21) is greatly improved.

〔Effect of the invention〕

As described above, according to the electric fan of the present invention, the support plate u9
By integrally supporting the stator (A) of the outer rotor type motor 12N) that rotates the fan on the support shaft that is thermally depressed, the heat generation factor of the motor Q'D is reduced. Since the heat of a certain stator winding can be transferred to the support plate cL1 via the support shaft (1) and radiated from the support plate a1, the cooling effect of the motor el) is greatly improved, and the cooling effect of the motor I2 is
In addition to improving the reliability of 1), it also becomes possible to reduce the size and weight of the motor and reduce costs.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the electric fan of the present invention, FIGS. 1 to 5 show the first embodiment, FIG. 1 is a cutaway side view of the main part, and FIG. Figure 3 is a front view of the motor, Figure 4 is a rear view of part of the fan, Figure 5 is a wiring diagram of the motor drive circuit, Figures 6 and 7 are the 6 is a partially cutaway side view of the whole, FIG. 7 is a cutaway side view of the main part, FIG. 8 is a rear view of a part of the third embodiment, and FIG. 9 is a conventional FIG. 2 is a partially cutaway side view of the electric fan. 4...Support plate, Head...Support shaft, ρ motor...Motor,
@... Stator, (to)... Rotor, Wing... Fan, (39)... Main unit stand.

Claims (1)

[Claims] (1) A support shaft integrally protruding thermally from a support plate supported by a main body stand, an external rotor type motor having a central stator integrally supported by the support shaft, and the motor and a fan integrally attached to a rotor on the outer periphery of the electric fan.