JPH05180499A - Controlling method for air conditioner - Google Patents

Abstract

PURPOSE:To prevent a decrease in room heating capacity at the time of starting an operation of a room heating by correcting a control phase angle of an indoor fan motor in response to a detected temperature of an indoor temperature sensor provided in an indoor unit, and setting a voltage to be applied to the motor higher the detected temperature is lower. CONSTITUTION:An indoor controller for an air conditioner comprises a tripole AC rectifier 10 for turning ON, OFF an indoor fan motor 3, a microcomputer 11 for generating a gate pulse of the rectifier 10, and a thermistor 12 for detecting an indoor temperature. The microcomputer 11 reads data of an internal memory 13 in response to the detected temperature of the thermistor 12, and corrects a conducting angle of the rectifier 10. Since the gate pulse is output from the microcomputer 11 at an earlier timing than in the case of a standard, the conducting angle of the rectifier 10 is increased, and a voltage to be applied to the motor 3 is raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control method for controlling the phase of an indoor fan motor (induction motor) of an air conditioner, and more particularly to a reduction in the rotation speed of an indoor fan motor immediately after starting heating operation. The present invention relates to a control method for an air conditioner that suppresses the above and prevents a decrease in capacity.

[0002]

2. Description of the Related Art Conventionally, in this type of air conditioner, an indoor fan (for example, a cross flow fan) is driven by an induction motor (fan motor), and the indoor fan is "strong" or "medium".
In addition, a tap method or a phase control method is adopted to control in a mode such as "light wind".

Since the rotation speed of the indoor fan motor may differ depending on the air conditioner, a phase control method capable of finely setting the rotation speed as compared with the tap method is becoming mainstream.

[0004]

By the way, in the above air conditioner, when the indoor fan is rotated, as shown in the graph of FIG. 3, for example, the ambient temperature of the indoor unit (ambient temperature of the indoor fan motor) causes the indoor fan to rotate in the same room. The rotation speed of the fan motor becomes low, and the decrease in the rotation speed becomes remarkable particularly immediately after the start of the heating operation, resulting in a decrease in the heating capacity. Therefore, improvement thereof is desired.

That is, as shown in FIG. 4, the bearing 2 supporting one end of the cross flow fan 1 and the bearing (bearing) 4 of the fan motor 3 are affected by the ambient temperature, and, for example, mechanical contraction of the bearing 2 occurs. This is because the rotational speed of the cross flow fan 1 is affected by the viscosity of the grease covering the bear rig and the change in the specific volume of the air, and the original rotational speed is not reached.

The present invention has been made in view of the above problems, and an object thereof is to suppress a decrease in the rotation speed of an indoor fan motor even when the ambient temperature of an indoor unit decreases, and particularly when the heating operation is started. An object of the present invention is to provide a control method of an air conditioner capable of suppressing a decrease in heating capacity.

[0007]

In order to achieve the above object, the present invention provides a method for controlling an indoor fan motor of an indoor unit by a phase control method, wherein the indoor temperature provided in the indoor unit is controlled. The gist is that the control phase angle of the indoor fan motor is corrected according to the temperature detected by the sensor, and the lower the detected temperature, the higher the voltage applied to the indoor fan motor.

[0008]

With the above method, when the phase of the indoor fan motor is controlled, an AC voltage is applied to the indoor fan motor via the AC rectifying element.

At this time, the control phase angle of the indoor fan motor is corrected in accordance with the ambient temperature of the indoor unit by referring to the data in a preset table, that is, the conduction angle of the AC rectifying element is corrected. .. Further, the table is composed of standard temperature in the room, data for each temperature range, the lower the ambient temperature, the larger the conduction angle of the AC rectifying element, the higher the voltage applied to the indoor fan motor. It has a data structure that

That is, the rotation speed of the indoor fan motor is affected by the decrease in the ambient temperature, which affects the bearing of the indoor fan motor and the bearing of the indoor fan.
In the case where the rotation speed decreases, the applied voltage of the indoor fan motor increases and the rotation speed of the indoor fan reaches the original value, so that the reduction of the heating capacity especially at the start of the heating operation can be suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The control method of an air conditioner according to the present invention is such that, when phase control is performed on an indoor fan motor (induction motor), the control phase is controlled according to the temperature detected by an indoor temperature sensor (thermistor, etc.) provided in the indoor unit. The angle is corrected so that the rotation speed of the indoor fan motor reaches the original value.

Therefore, as shown in FIG. 1, the indoor control device of the air conditioner includes a three-pole AC rectifying element (triac (trade name)) 10 for turning on and off the indoor fan motor 3, and this AC. The microcomputer 11 is provided with a microcomputer 11 for generating a gate pulse of the rectifying element 10 and a thermistor 12 for detecting an indoor temperature. The microcomputer 11 has an internal memory unit (table) 13 according to the temperature detected by the thermistor 12. Is read out and the conduction angle of the AC rectifying element 10 is corrected.

The data in the above table has the structure shown in Table 1 below. These data are the time data from the AC zero cross point to the time when the AC rectifying element 10 is turned on (corresponding to the phase angle of phase control). To)
Table 1 below is standard when the ambient temperature of the indoor unit is 20 ° C. or higher, for example, in “strong wind” mode (1200 rp).
m), 30 (H), in "medium wind" mode (1000 rp
m) 60 (H), in "weak wind" mode (800 rp
In m), the data is 90 (H).

[0014]

[Table 1] In this case, if the time data is 00 (H), almost 100% of the AC voltage is applied to the indoor fan motor 3 via the AC rectifying element 10, and the time data is FF (H).
Then, almost 0% of the AC voltage is equal to the AC rectifying element 10
Will be applied to the indoor fan motor 3 via.

Next, a method of controlling the indoor fan applied to the indoor control device having the above structure will be described with reference to the voltage waveform diagram of FIG.

First, assuming that the operation of the air conditioner is started, the microcomputer 11 turns on and off the AC rectifying element 10. At this time, an AC voltage (shown by an arrow a in the figure) from the AC commercial power supply 14 of the air conditioner is applied to the indoor fan motor 3 via the AC rectifying element 10, depending on the temperature detected by the thermistor 12. Then, the timing of turning on the AC rectifying element 10 is determined.

Here, as shown in the figure, the half cycle of the AC voltage a is divided by 256 to divide 00 (H) to FF.
(H) data, for example, during "strong wind" (120
0 (rpm)), the thermistor 12
If the temperature detected by the standard is 20 ° C, the above table 1
Causes the time data (corresponding to the phase angle) to be 30 (H).

Then, 30 (H) is set in the internal timer of the microcomputer 11, and the AC voltage a is set.
When 30 (H) has passed from the zero cross point of the above, the internal timer expires. Due to this time-up, a gate pulse for turning on the AC rectifying element 10 is output from the microcomputer 11, and the voltage waveform across the AC rectifying element 10 becomes as shown by the diagonal lines in the figure.

In this case, since the ambient temperature of the indoor unit is as high as 20 ° C., the rotation speed of the indoor fan motor 3 reaches 1200 (rpm) without decreasing.

Here, the standard ambient temperature of the indoor unit is 2
It is lower than 0 ° C. and is 10 ° C. or higher and lower than 20 ° C. For example, when the heating operation is started, the time data is increased by 2 (H) to 28 (H).

That is, since the gate pulse is output from the macro computer 11 at an earlier timing than in the case of the standard, the conduction angle of the AC rectifying element 10 is increased and the voltage applied to the indoor fan motor 3 is increased. Get higher

In the conventional case, the rotation speed of the indoor fan motor 3 decreases as shown in the graph of FIG.
As described above, since the voltage of the indoor fan motor 3 becomes high, the rotational speed of the indoor fan motor 3 becomes 1200.
(Rpm) is reached, that is, a decrease in the rotational speed is suppressed, and a decrease in heating capacity at the start of the heating operation is suppressed.

The ambient temperature of the indoor unit is 0 ° C. or higher and 1
When the temperature is lower than 0 ° C., the time data (corresponding to the phase angle) is set to 20 (H), and when the room temperature is lower than 0 ° C., the same time data is set to 18 (H), In each case, the voltage applied to the indoor fan motor 3 is increased, and the decrease in the rotation speed of the indoor fan motor 3 is suppressed.

As described above, since the rotation speed of the indoor fan motor 3 does not decrease with the decrease in the ambient temperature of the indoor unit, and the rotation speed reaches the original value, the heating of the air conditioner is performed. There is no loss of ability.

By the way, the case where the indoor fan motor 3 is controlled in the "strong wind" mode has been described. However, even when the indoor fan motor 3 is controlled in the "medium wind" and "light wind" modes,
According to Table 1, the on-timing of the AC rectifying element 10 is determined, that is, the control phase angle of the indoor fan motor 3 is corrected in the same manner as described above, and the decrease in the rotation speed of the indoor fan motor 3 is suppressed.

Although the heating operation is started as an example, this is because the decrease in the rotation speed of the indoor fan motor 3 is large when the heating operation is started and the heating capacity is significantly decreased. Therefore, the above embodiment can be applied to other states of the air conditioner, for example, during heating operation, and the same action and effect can be obtained.

Further, in the above embodiment, the control phase angle of the indoor fan motor 3 is corrected by the table of Table 1 above, but the number of data shown in Table 1 is not limited, and the control phase angle of each air conditioner is not limited. The data may be determined according to the characteristics, and the data may be determined more finely according to more indoor temperature ranges.

[0028]

As described above, according to the air conditioner control method of the present invention, when the indoor fan motor is controlled by the phase control method, the indoor fan motor is controlled according to the ambient temperature of the indoor unit. The phase angle was corrected based on a table that was determined in advance, and the lower the ambient temperature, the higher the applied voltage to the indoor fan motor, so the ambient temperature of the indoor unit was low and the rotation of the indoor fan motor was low. When the number decreases, the applied voltage to the indoor fan motor increases, so that the decrease in the rotational speed can be suppressed, and the rotational speed of the indoor fan motor can be set to the original value. There is an effect that it is possible to suppress a decrease in heating capacity at the start of heating operation.

[Brief description of drawings]

FIG. 1 is a schematic partial block diagram of an air conditioner to which an indoor fan control method is applied according to an embodiment of the present invention.

FIG. 2 is a schematic voltage waveform diagram illustrating a control method of the air conditioner shown in FIG.

FIG. 3 is a schematic graph illustrating the rotation speed of the indoor fan motor of the air conditioner.

FIG. 4 is a schematic partial cross-sectional view of an indoor fan of an air conditioner.

[Explanation of symbols]

 1 Cross Flow Fan (Indoor Fan) 3 Indoor Fan Motor (Induction Motor) 10 AC Rectifier Element (Triac; Product Name) 11 Microcomputer 12 Indoor Temperature Sensor (Thermistor) 13 Memory Unit (Microcomputer 11) 14 AC Commercial Power Supply

Claims (1)

[Claims] 1. A control method of an air conditioner for controlling an indoor fan motor of an indoor unit by a phase control method, comprising: a control phase angle of the indoor fan motor according to a temperature detected by an indoor temperature sensor provided in the indoor unit. To correct
A method for controlling an air conditioner, wherein the lower the detected temperature is, the higher the voltage applied to the indoor fan motor is.