JPS58139694A - Low speed operating circuit for motor - Google Patents

Abstract

PURPOSE:To perform the low speed operation of a motor without decreasing the starting property of the motor by electrically connecting the motor through a switching circuit to a power source circuit and electrically controlling ON or OFF the switching circuit. CONSTITUTION:A motor 1 is electrically connected through a switching circuit 3 to a power source circuit 2, and an oscillator 4 for controlling ON or OFF the circuit 3 is electrically connected to the circuit 3. Accordingly, when the circuit 3 is ON, a power source voltage is applied to the motor 1, which generates a starting torque, but the motor operates in high speed operation as it is. Accordingly, the circuit 3 is interrupted by the oscillator 4 when the motor is accelerated at the prescribed rotating speed. The low speed operation of the motor can be continued by repeating the ON and OFF operations of the circuit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Misfire 1!1 relates to the low-speed operation circuit of Tanabata.

Conventionally, a relatively large fan device was installed on the ceiling surface t=r
It is known that in the summer, the falling indoor air is convected, giving a cooling sensation, while in the winter, the rising warm indoor air is reversed, thereby eliminating uneven indoor temperatures. It is being

In such a fan device, for example, as shown in the figure, a support column C is provided to protrude downward from a support part fixed to a ceiling plate a, and a drive part having a motor is attached to the lower end of the column C. d are arranged in series, a plurality of blades O are provided on the drive section d-, and an illumination light q is attached via the operating section f. The operation section f is provided with a speed control switch h1, a forward/reverse switch i, and a pull switch j for the +411 light.

The motor used in such a fan device requires a starting torque to overcome the static friction force of the bearing when starting the motor, so it is necessary to apply sufficient voltage to the motor to generate the starting torque. It has become.

However, after the motor starts, the operating torque that balances the dynamic friction force of the bearing and the external convexity during rotation, which is necessary to keep the rotation constant, is considerably smaller than the starting torque. Therefore, even after the motor has started, if the voltage used to generate the starting torque continues to be applied to the motor, the motor will run at a fairly high speed at a constant rotation. -y-h is operated to operate at low speed.However, the speed control switch h1 changes the resistance value of the variable resistor for voltage adjustment interposed between the iron, the power source, and the motor. Tame, 3
It was only possible to operate at low speeds up to about O rpm, and was insufficient for practical use. In addition, the user is required to start the motor and operate the speed control switch h, and considering that it is installed at a relatively high place, the operability is low.

The present invention has been made in view of the above points, and includes electrically connecting a motor to a power supply (path) via a switching circuit.
The main object of the present invention is to provide a low-speed operation circuit for a motor that eliminates the above-mentioned problems by electrically controlling the switching circuit on and off.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to embodiments with reference to the drawings.

In FIG. 1, the low-speed operation circuit of the motor 1 (fan motor) basically consists of the motor 1 being electrically connected to the power supply circuit 2 via a switching circuit 6, and the switching circuit 6 connected to the switching circuit 6. An oscillation circuit 4 for ON-OFF control of the circuit 3 is electrically linked.

Therefore, when the switching circuit 3 is in the ON state, the power supply voltage is applied to the motor 1 and a starting torque is generated, but if this continues, the motor will run at high speed, so when the rotation speed increases to a predetermined number, the switching circuit 3 is turned off. It is controlled by the oscillation circuit 4 to do so. This is motor 1
This takes advantage of the fact that once started, a moment of inertia is generated, so even if the switching circuit 6 is turned off, it does not stop immediately.However, in the OFF state, the rotation speed gradually decreases, so the switching circuit 3 is turned on at an appropriate time. It is necessary to turn it on again.

By repeating such ON-OFF operation, low-speed operation can be maintained. By changing the repetition period of the ON-OFF operation of the switching circuit 3, it is possible to continuously change the rotational speed of the motor 1 from a low speed operation (about 20 rpm) to a high speed rotation CC of about 760 rpm.

Next, we will explain the operation of specific electric circuits.
This will be explained along with FIG.

First, the integrated circuit I Cl0I controls the gate of the triac Q101 that controls the switching circuit 6 to FIN[iJ to turn the triac QIOI ON-OFF, or does it have a function to perform phase control operation?
Therefore, the voltage applied to the motor 1 is all -cycles in the AC cycle of H1 or Hz. In addition, since it has a built-in zero cross control circuit,
Conduction does not start in the middle of the AC phase.

This integrated circuit ICl0I has two terminals t1. t2. t
3. t4゜t5. t5. t7. t8 (see FIG. 3), and an internal circuit 11 (comparator) that compares the voltages applied to terminals t3 and t4, which are input terminals. As a result, if (voltage of terminal t4>voltage of terminal t3), an output (d) that turns off the triac QIOI is output to terminal t6, while (voltage of terminal t3>voltage of terminal t4)
voltage), an output signal that turns on the triac Q401 is output.

Note that since the main operation of the integrated circuit rc101 is as described above, it is also possible to use other individual components or another integrated circuit, but since it is advantageous in terms of the number of parts, space, and price, - An integrated circuit ICl0I is used as an example.

Next, voltage waveforms at each part of the circuit will be explained with reference to FIGS. 2 and 9.

A low frequency oscillation circuit is configured by the resistor R101, the capacitor C102 and the thyristor Q102, and a voltage waveform S1 is generated between both terminals of the capacitor ClO2, and the I
It is input to the terminal t3 of Cl0I. On the other hand, ICl0
A DC voltage divided by a variable resistor R102 is generated at a terminal t4 of I, and the voltage waveform thereof is indicated by S2. Therefore, ICl0I is the voltage waveform s1. By comparing the magnitude of the voltage related to s2, the triac Q 101
0N-OF through terminal t6 and resistor RI06.
Outputs an operation signal to control F. The voltage waveform of this operation signal is s3, and the AC waveform of the power supply voltage applied to the motor 1 is S4.

As a result, the change in the rotational speed of the motor 1 is represented by a waveform S5, and the change in the torque of the motor 1 is represented by a waveform S6. Therefore, when the triac Q 101 is in the N state, the power supply voltage is applied directly to the motor 1, so maximum torque is generated, which makes starting easier and increases the rotational speed. become.

Note that the 0N-OFF/period T is 5 seconds of θ, /~, and is appropriately set in consideration of various conditions such as photographing of the motor 1.

In addition, the rotation speed of the motor 1 can be adjusted using a variable resistor R+o2.
By changing the resistance value of the terminal t4, the current voltage applied to the terminal t4 can be changed, so that the waveform S2 changes in accordance with the change, thereby turning on the waveform S3.
This can be easily done by changing the time ratio between OFF and OFF.

Further, the condenser Cl0I, the diode D101, and the resistor R104 are components that constitute the power supply circuit of the ICl0I.

The circuit shown in FIG. 1 mentioned above is a basic circuit,
In the case of a single inductive load such as a motor in a fan device, a circuit as shown in FIG. J is applied to ensure reliable operation based on the gate characteristics of the triac Q101. Note that the same reference numerals are used for the same components as in the circuit of FIG. 2. Further, the waveform diagram (timing chart) of the main part of the circuit is the same as that shown in FIG. In other words, the configuration of the circuit itself is not particularly limited as long as it satisfies the waveform diagram shown in FIG. However, it goes without saying that σ) can also be applied to other motors.

Therefore, it can be used in place of a conventional mechanical speed reduction device using gears, etc., and is advantageous in terms of weight reduction and noise reduction.

Since the present invention is configured as described above, the motor Q) has a practical effect of enabling low speed operation of the motor without deteriorating the startability.

[Brief explanation of drawings]

Figures 1 to 5 illustrate the implementation of the present invention. Figure 1 is a block diagram of a low-speed operation circuit of the motor, Figure 2 is an electric circuit diagram of the same, and Figure 3 is a diagram of the same electric circuit. A diagram of the integrated circuit in the circuit of Figure 2, Figure 7 is a schematic diagram showing the waveforms of the main parts of the circuit of Figure 2, and Figure 5 is an electrical circuit diagram of a practical circuit based on the circuit of Figure 2. , FIG. 3 is a front view of the fan device. 1...Motor, 2...Power circuit, 6...
・Switching circuit, 4...Oscillation circuit Akira l

Claims (1)

[Claims] Mountain: A motor is electrically connected to a power supply circuit via a switching circuit, and ON-OF is connected to the switching circuit.
A low-speed operation circuit for a motor, characterized in that an oscillation circuit for F control is electrically linked, 1