JPS63117691A - Control circuit for air conditioning motor - Google Patents

Abstract

PURPOSE:To energy-save a blower by detecting the variation in resistance in and out of the blower from a motor current to control a phase. CONSTITUTION:When a foreign material is adhered to an air filter and resistance in and out of a blower are increased, the rotating speed of a motor 1 for the blower is reduced, thereby decreasing a blower current. The variation amount of the current value is detected through a detecting coil 5 by a current detector 7, and fed back to phase control means 8. The means 8 varies the firing phase amount of R-, S-and T-phases by this feedback to raise a voltage supplied to the motor 1, thereby increasing its torque. Thus, the rotating speed of the motor 1 is raised to control to increase air quantity. When the resistors in and out of the blower become larger than a specified value for a long operation time, the detector 7 fires a check lamp 9 connected thereto.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an air conditioner that performs all cooling or heating (hereinafter referred to as an air conditioner), and in particular an air conditioner that fully controls an electric motor used in a blower for a heat exchanger on the user side. This invention relates to a control circuit for an electric motor.

[Conventional technology]

FIG. 2 is a control system diagram of a portion of a conventional general air conditioner. In the figure, a blower electric motor, IR, is used to drive a blower that forcibly exchanges heat between the air in the TH chamber P'3 and the heat medium in a heat exchanger on the user side.

ts, t'r are R・S- connected to the blower motor l
T-phase power lines, 2a, 2btj: Control system fuses connected to the R-phase and S-phase power lines IR, is at one end, respectively; 3 and 4 are connected in series between the other ends of both fuses 2a, 2b. These are the connected operation relay and operation switch.

The driving relay 3 is an R- connected to the blower electric motor.
8-A contact 3a interposed in each of the T-phase power lines LR, 18, and LT? and supplies power to the blower motor 1.
make it stop. Further, the operation switch 4t: supplies and stops power to the operation relay 3.

Next, the operation will be explained. When operating the air conditioner, when the R-8-T phase power is turned on to the main circuit, fuse 2
Voltage is generated between both ends of a and 2b, operation switch 4
When turned on, the operating relay 3 is energized, and the a contact 3a is turned on, thereby rotating the blower electric motor 1 and starting full air conditioning.

[Problem that the invention seeks to solve]

Since the control circuit for an air conditioning motor according to the present invention is configured as described above, foreign objects in the room can be installed on the airflow path of the blower and adhere to the air filter or the airflow path, increasing resistance inside and outside the machine. Not only does the air volume decrease, making the quality of the air conditioning (cooling or heating) worse, but there are also many cases where the operator continues to operate without noticing the problem, as there is no display function to notify of clogged air filters, etc. There were problems such as shortening the lifespan of the air conditioner itself.

This invention was made in the ninth attempt to solve the above-mentioned problems, and it changes the voltage supplied to the blower motor to prevent the increase in resistance inside and outside the machine, and when the resistance exceeds a certain limit, the air filter It is an object of the present invention to provide a control circuit for an air conditioning motor that can display information indicating clogging, etc.

[Means for solving problems]

The control circuit for an air conditioning motor according to the present invention is provided with a phase control means for controlling the firing phase of each phase of the power source in the main circuit of the blower, and a current detection means coated with gold film on at least one phase, and a current detection means is coated with gold film on at least one phase. Feedback is provided to the phase control means, and when the amount of change in the current value falls within a predetermined range, the display means displays a t-light.

[Effect]

The air conditioning motor control circuit according to the present invention converts the current value change in the main circuit into a total ignition phase change using both means on the first phase side, changes the supply voltage value to the blower motor, and detects the current within a predetermined range. When the amount of change in the current within is detected, the display means displays an image by supplying power from the current detection means.

〔Example〕

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

In Fig. 1, the same symbols 1 to 4 as in Fig. 2 are the same as before.
Or, if it is an equivalent part, its explanation will be omitted. Reference numeral 5 indicates a detection coil for detecting the current, which is wound around the S opposite intS between the blower motor 1 and the a contact 3a, 6 indicates a power transformer whose primary side is connected in parallel to the operating link 3, and 7 indicates a detection coil for detecting current. Each input terminal is connected to the secondary winding of the detection coil 5 and the power transformer 6, and power is supplied from the power transformer 6, and the detection coil 5
8 is a phase control means interposed in the R-8-T phase power supply line LR, is, IT between the a contact 3a and the R-8-T phase power supply; The firing phase of the R-8-T phase is controlled according to the current change value detected by the current detection device 7.

8af'i, R-8-T phase power line tR, is, t'
Thyristor group 8b is interposed in each of the thyristor groups 8b and 8b, which change the phase of the firing pulse according to the magnitude of the detection signal of the current detection device 7.
This is a phase control circuit that supplies each firing pulse to each gate of a. The phase control means 8 is composed of a thyristor group 8a and a phase control circuit 8b. 9 is an LED, for example.
It is connected to the current detection device 17 with a check rung such as , and receives or does not receive power depending on the detected amount of current change.

Next, the operation of this embodiment will be explained. When operating the air conditioner, when power (for example, AC 200V) is applied to the main circuit of the blower motor 1 in the R-8-T phase, voltage is applied between the fuses 2a and 2b, and the operation switch 4 is turned on. When fully turned on, the operating relay 3 is energized, voltage is applied to the power transformer 6, power is supplied to the current detection device 7, and the initial voltage of the generator circuit is controlled by the phase control of the phase control means 8 as shown below. Reduced to low voltage.

When the operating relay 3 is energized, the a contact 3& turns on, and if the air path resistance is below the specified value (for example, when installing an air conditioner), the 5
A voltage around 0% (for example, in this embodiment, the power supply voltage AC2
00V, around AC 100V) is supplied, and the blower electric motor l rotates.

After the air conditioner has been operating for a certain amount of time (for example, about 500 to 1000 hours), foreign matter will adhere to the air filter, etc.
As the resistance inside and outside the machine increases, the rotation speed of the blower, that is, the rotation speed of the blower electric motor 1, decreases, and the blower electric motor IK decreases.
The blower current flowing decreases.

The amount of change in this current value is detected by the current detection device 7 through the detection coil 5 and fed back to the phase control means 8.

This feedback causes the phase control means 8 to change to R-8-T.
By changing the amount of the ignition phase of the phase and increasing the torque by increasing the entire voltage supplied to the blower motor 1, the blower motor 1
Control is performed to increase the air volume by increasing the 0 rotation speed. Further, if the resistance outside or inside the machine becomes larger than a specified value due to a long operating time, the current detection device 7 performs control to turn on all the check cranks 9 connected thereto.

Further, although this embodiment has been explained with reference to the control of a blower of an air conditioner, the same effects as in the above embodiments can be obtained when the present invention is used to control a protection circuit for overcurrent detection.

〔Effect of the invention〕

As described above, according to the present invention, the phase control means is provided in the main circuit of the blower motor, and the operation of the phase control means is controlled by detecting the amount of change in the energizing current of the blower motor, and the energizing current is controlled to a certain extent. When it gets low, Cheno 22 F1
2 lights up, it changes the supply voltage of the blower in response to changes in resistance inside and outside the machine, and prevents a drop in air volume, which alleviates problems such as poor air conditioner performance and lowers the initial voltage. By setting this setting, the input drop of the blower can be measured, which saves energy, and the rung notifies you when the air filter is clogged, allowing you to continue operating without knowing that the air filter is clogged, thereby completely preventing any negative effects on the air conditioner itself.

[Brief explanation of the drawing]

FIG. 1 is a control system diagram showing one embodiment of the present invention, and FIG. 2 is a conventional control system diagram. In the figure, 1... electric motor for blower, 5... detection coil, 7... current detection device, 8... phase control means,
9...Display means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A user-side heat exchanger for exchanging heat between indoor air and a heat medium, a driving electric motor used for a blower for forcing the user-side heat exchanger to exchange heat by blowing air, and a drive electric motor connected to the electric motor. The air conditioner has a plurality of power supply lines for supplying power, and is configured to harmonize the temperature of the indoor air through heat exchange, the air conditioner having a coil attached to at least one phase of the power supply line. and a current detecting means for detecting the amount of current change in the at least one phase line caused by the load fluctuation of the motor, and a display signal from the current detecting means when the detected current amount is within a specified range. It has a display means for displaying information when supplied with power, and a group of thyristors interposed in the power line, and a firing pulse is sent to the gate of the group of thyristors in accordance with the magnitude of a feedback signal from the current detecting means. 1. A control circuit for an air conditioning motor, comprising: a phase control means for changing a supply voltage supplied to the motor by changing a phase thereof.