JPH0348358B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides an electric fan whose elevation angle can be adjusted,
The present invention relates to an operation control device for an electric fan, in which a fan of the electric fan is mounted on a rotor that rotates by electromagnetic force generated by a fan motor, and the rotational speed of the fan motor is controlled in variable speed.

<Conventional technology> For example, when a capacitor run induction motor is used, a conventional electric fan operation control device includes a speed change lead wire in the auxiliary winding, or a reactor connected in series with the motor winding. A gear shift notch is provided.

However, when performing multi-speed shifting, it is necessary to provide a large number of shift notches, and the wiring connections thereof are extremely complicated and difficult.

Therefore, speed change control is performed by controlling the power supply to the fan motor at the zero cross of the AC sine wave.

In other words, as shown in Figure 1, 2 of the power supply frequency
Control is performed by repeating one week of energizing one half-wave in succession and de-energizing the next half-wave.

The rotational speed of the fan motor is changed by changing the number of energized half-waves and the number of de-energized half-waves of the fan motor.

<Problems to be Solved by the Invention> With the fan operation control device configured as described above, when the elevation angle θ of the fan is increased as shown in FIG. 2, the power supply to the fan motor is interrupted. Therefore, the rotor of the fan motor was making a rumbling noise.

This fan motor rumbling noise is caused by the third
As shown in the figure, this occurs when the angle of elevation is large and the motor is held obliquely. In other words, the rotor shaft 1' of a fan motor generally has an axial play of about 1 mm, and when the fan motor is energized, electromagnetic force is generated and the electromagnetic centers of the stator 2' and rotor 3' align. The rotor 3' rotates at the position shown by the dotted line in Figure 3, and when the power to the fan motor is cut off, the electromagnetic force disappears and the rotor 3' is in the downward position (the position shown by the solid line in Figure 3). Move to and stop. In this manner, when the power to the fan motor is cut off, the rotor 3' moves from the electromagnetic center position to the downward position, and the rotor 3' hits the stopper, producing a rumbling sound.

<Purpose> The present invention has been made in view of the above-mentioned problems, and by varying the energization time to the high-speed notch and the low-speed notch and switching the energization to the high-speed notch and the low-speed notch, It is an object of the present invention to provide an operation control device for an electric fan that prevents rattling noise and controls the rotation speed of a fan motor.

<Means for Solving the Problems> In order to achieve the above object, the electric fan operation control device of the present invention is provided so that the elevation angle of the electric fan can be adjusted, and the fan of the electric fan is controlled by an electromagnetic force generated by a fan motor. The fan motor is provided on a rotating rotor, and has a high-speed notch and a low-speed notch, and is set by an energization time variable means for varying the energization time to the high-speed notch and the low-speed notch, respectively, and the energization time variable means. A switching means is provided for alternately switching energization to the high speed notch and the low speed notch based on the energization time, and the switching means switches the energization to the high speed notch and the low speed notch to control the speed of the rotation speed of the fan motor. There is.

<Function> The electric fan operation control device described above controls the generation of electromagnetic force of the fan motor by varying the energization time to the high-speed notch and the low-speed notch of the fan motor, and by switching the energization to the high-speed notch and the low-speed notch. Controls the speed of the fan motor without losing it.

<Example> Hereinafter, an example of the electric fan operation control device of the present invention will be described in detail with reference to the drawings.

Fig. 4 is an electric circuit diagram of a fan operation control device according to the present invention using an astable multivibrator, and Fig. 5 is a waveform diagram in the same circuit.
1' is the main switch, SW2' is the timer switch, SW3' is the swing switch, SM' is the swing motor, C1' is the noise prevention capacitor,
R3', R4' are resistors, C3', C4' are capacitors, VR1', VR2' are variable resistors, Q1', Q2'
is a transistor, D2' and D3' are diodes,
These resistors R3', R4', capacitors C3', C
4', variable resistor VR1', VR2', transistor Q
1', Q2', and diodes D2' and D3' constitute an astable multivibrator. The above variable resistors VR1', VR2' and capacitors C3', C4'
The transistors Q1' and Q2' and the capacitors C3' and C4' form a switching means.

Here, the diodes D2' and D3' prevent excessive current from being applied between the bases and emitters of the transistors Q1' and Q2'.

Also, FM′ is a fan motor (single-phase induction motor).
ML' is the main winding, SL' is the auxiliary winding, C5' is the motor capacitor, SA' is the highest speed notch winding outlet,
SB′ is the lowest speed notch winding outlet, SCR1′, SCR
2' is a bidirectional thyristor (triack), and each _t2 terminal is the highest speed notch winding outlet.
SA' and the lowest speed notch winding outlet SB'.

In FIG. 5, T1' indicates the time when transistor Q2' and triax SCR1' are turned on and the maximum speed notch winding outlet SA' is energized, and T1'≒
0.7C4′VR2′, and T2′ is the transistor Q
1' indicates the time when the triac SCR2' is turned on and the lowest speed notch winding outlet SB' is energized,
T2≒0.7C3′VR1′.

In this way, the highest speed notch winding outlet SA' is energized for time T1', and when the T1' time has elapsed, the current is passed from the highest speed notch winding outlet SA' to the lowest speed notch winding outlet SB'. The energization is switched, and the lowest speed notch winding outlet SB' is energized for a time T2';
During these heating times T1' and T2', the energization to the highest speed notched winding outlet SA' and the lowest speed notched winding outlet SB' can be alternately switched thereafter.

Then, each of the above-mentioned maximum speed notched winding outlet SA' and lowest speed notched winding outlet SB' is energized for a time T.
By varying 1' and T2' with variable resistors VR1' and VR2', the rotational speed of the fan motor can be controlled in variable speed.

In the circuit using the above-mentioned astable multivibrator, either transistor Q1' or Q2' is always on, so an electromagnetic force is always generated in the motor FM', and the rotor is fixed at the electromagnetic center position, causing a rumbling. No sound is generated.

By adjusting the variable resistors VR1' and VR2', the speed can be freely changed from the highest speed (SA' continuous energization) to the lowest speed (SB' continuous energization).

Note that even if only one of VR1' and VR2' is a variable resistor and the other is a fixed resistor, a considerable range of speed changes is possible.

Further, the configuration of the lowest speed notch can be set not only by the configuration as in the above embodiment but also by a reactor (inductance) or a resistor as shown in FIGS. 6a and 6b.

<Effects of the Invention> Since the electric fan operation control device of the present invention has the above-described configuration, the rotation speed is controlled in variable speed while the electromagnetic force is always being generated in the fan motor. It is possible to prevent the occurrence of rumbling noise due to movement.

[Brief explanation of drawings]

Figure 1 shows the ON-
ON-OFF explanatory diagram of the OFF control method, Figure 2 is the 1st
Fig. 3 is an internal mechanism diagram of the fan motor of the electric fan shown in Fig. 2, and Fig. 4 is an electric fan according to the present invention using an astable multivibrator. FIG. 5 is a waveform diagram in FIG. 4, and FIGS. 6a and 6b are explanatory diagrams showing other embodiments of the lowest speed notch in FIG. 4. In the figure, FM': fan motor, SA': highest speed notched winding outlet, SB': lowest speed notched winding outlet.

Claims (1)

[Scope of Claims] 1. A fan operation control device in which the elevation angle of the fan is adjustable, and the fan of the fan is mounted on a rotor that rotates by electromagnetic force generated by a fan motor, wherein the fan motor is a high-speed notch. and a low-speed notch, and energization time variable means for varying the energization time to the high-speed notch and the low-speed notch, respectively; 1. A fan operation control device, comprising: switching means for alternately switching energization;