KR20110021478A - Ventilation device and control method thereof - Google Patents

Abstract

PURPOSE: A ventilation system and a control method thereof are provided to ensure sufficient ventilation even if the static pressure in a duct increases. CONSTITUTION: A ventilation system(1) comprises an intake duct, an exhaust duct(20), an intake fan(15), an exhaust fan(25), a heat exchanger(5), an intake motor, an exhaust motor, and a control device. The intake duct forms an intake flow path(5a) for drawing outdoor air into the indoor space by the intake fan. The exhaust duct forms an exhaust flow path(5b) which crosses the intake duct and discharges indoor air to the outdoor space by the exhaust fan. The heat exchanger is installed in the intersection of the exhaust duct and the intake duct and implements heat-exchange between the outdoor air drawn in and the indoor air discharged. The intake motor and the exhaust motor respectively rotate the intake fan and the exhaust fan. The control device measures the driving current and rotation speed of the intake motor or/and the exhaust motor, estimates the current static pressure in a duct from the measurements, and determines the target rotation speed of the motor in order to raise or lower the current rotation speed of the motor.

Description

Ventilation device and control method

The present invention relates to a ventilator and a control method thereof, and more specifically, to provide a constant air flow rate without using a separate static pressure sensor or a control device that measures and feeds back a discharged air flow rate value. The present invention relates to a ventilator capable of providing a sufficient amount of ventilation in an air conditioning region even when the static pressure increases, and a control method thereof.

The present invention obtains the desired amount of static air flow only by the current and speed information of the fan load motor without using a separate static pressure sensor or a control device that measures and feeds back the amount of discharged air flow, and the fan load motor obtained through self-testing. The present invention relates to a ventilation device and a control method thereof capable of providing more precise static air flow by self-calibrating a driving characteristic of a fan in real time with operating current and speed information.

In general, the ventilator is a device for discharging indoor polluted air and sucking and supplying fresh and clean air to the room.

An air conditioner without a ventilation function circulates indoor air and cools or heats the room to cool or heat the room. In some cases, the air conditioner is provided with a filter, but the degree of pollution in the room is gradually increased, and the air cleaning function by the filter is limited. Therefore, a ventilation process of the indoor air is required.

Therefore, a separate ventilation device may be provided even when an air conditioner for circulating indoor air and cooling and heating the room is installed.

The conventional ventilator includes an air supply duct forming an air supply passage for sucking outdoor air into the indoor space and an exhaust duct intersecting the air supply duct and forming an exhaust passage for exhausting indoor air into the outdoor space.

In addition, the conventional ventilator is mounted on one side of the air supply duct, the air supply fan for suctioning outdoor air into the indoor space and the exhaust fan and each fan for exhausting indoor air to the outdoor space is mounted on one side of the exhaust duct It includes an air supply motor and an exhaust motor to rotate.

The ventilation process in the conventional ventilation device configured as described above will be described in detail.

When the indoor air is contaminated to some extent, power is supplied to the exhaust fan, and the indoor air flows into the exhaust duct and is discharged into the outdoor space. At the same time, the fresh air is supplied to the indoor space through the air supply duct while the air supply fan is supplied with power. Inflow, ventilation of the indoor space is achieved.

The duct-type ventilator has a discharge air volume discharged from the air conditioning unit when the discharge air volume discharged from the discharge port of the duct that is subjected to the static pressure according to the length and condition of the duct therein is different from the required discharge air volume required in the air conditioning area. It is required to be adjusted to suit the required discharge air volume required in the air conditioning zone.

In the conventional duct type ventilation system, when the discharge air volume discharged from the discharge port of the duct is smaller than the required discharge air volume in the air conditioning area, a method of reducing the static pressure inside the duct or replacing a large fan motor is used. .

In particular, in the case of high-rise buildings, the draft is changed at different times, and the fluctuation of the draft can increase or decrease the static pressure in the duct. When the amount of discharge air discharged from the duct decreases due to an increase in the static pressure in the duct due to the increase in the external wind pressure, there is a problem in that sufficient ventilation amount is not provided to maintain the indoor space comfortably.

As described above, the conventional ventilation device does not provide sufficient ventilation according to the static pressure fluctuation in the duct due to the external wind pressure, and thus there is a problem that it is difficult to maintain the indoor space comfortably.

The present invention has been made to solve the above problems, an object of the present invention is to provide a constant air flow (Constant Air Flow) and a ventilation device that can provide a sufficient ventilation amount even when the static pressure in the duct increases It is to provide a control method.

In addition, another object of the present invention is to obtain the desired amount of constant air flow only by the current and speed information of the fan load motor without using a separate static pressure sensor or a control device for measuring and feeding back the discharged air flow rate value, and through this self-test The present invention provides a ventilator and a control method thereof capable of providing more precise static air flow by self-calibrating the operating characteristics of a fan in real time based on the determined fan load motor operating current and speed information.

In addition, another object of the present invention is to maintain a constant ventilation amount by accelerating the rotational speed of the fan motor when the static pressure in the duct increases with the increase in the outside air pressure, the rotation of the fan motor when the static pressure in the duct decreases It is to provide a ventilator and a control method thereof capable of preventing unnecessary power consumption by reducing the speed.

The present invention is to achieve the above object,

According to one aspect of the invention,

An air supply duct forming an air supply flow path for sucking outdoor air into the indoor space, and an air exhaust duct intersecting with the air supply duct and forming an air exhaust passage for exhausting indoor air to the outdoor space; An air supply fan provided on one side of the air supply duct to suck outdoor air into the indoor space, and an air exhaust fan provided on one side of the exhaust duct to exhaust indoor air to the outdoor space; An electrothermal heat exchanger provided at an intersection area of the air supply duct and the air exhaust duct, the heat exchanger for exchanging indoor air to be exhausted and outdoor air to be sucked; An air supply motor and an exhaust motor which rotate the air supply fan and the exhaust fan, respectively; And to measure the operating current and rotational speed of at least one of the air supply motor and the exhaust motor in order to provide a constant air flow rate, and to estimate the static pressure in the current duct by the value, and to obtain the actual air pressure through the self test operation according to the estimated static pressure. A ventilator is provided that includes a control device for determining a target rotational speed of the motor to accelerate or decelerate the current rotational speed of the motor.

Here, the control device may accelerate the rotational speed of the motor when the target rotational speed is greater than the current rotational speed of the motor, and reduce the rotational speed of the motor when the control speed is smaller than the current rotational speed.

In addition, the control device indicates the target rotational speed of the motor, converts the rotational speed of the motor into a PMW signal of the duty value according to the control unit for comparing the measured current rotational speed of the motor and the input target rotational speed of the motor It may include a motor driving unit for driving.

The controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and maintains the current rotational speed of the motor when the average duty value is included in the constant wind amount duty interval determined through trial run. Can be.

Alternatively, the controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and when the average duty value has a value larger than the maximum value of the constant air flow rate duty period determined through trial run. The rotation speed of the motor may be accelerated, and the rotation speed of the motor may be slowed down when the average duty value is smaller than the recovery value of the constant wind amount duty period determined through the trial run.

According to another aspect of the invention, the duct is formed with a flow path for flowing indoor or outdoor air to the outdoor space or indoor space; A fan provided at one side of the duct and configured to exhaust or supply indoor or outdoor air to an outdoor space or an indoor space; A motor for rotating the fan; And measuring the rotational speed of the motor in operation, estimating the static pressure in the current duct by using the value, and determining the target rotational speed of the actual motor determined through self-test according to the estimated static pressure to accelerate the current rotational speed of the motor. Or a ventilator comprising a control device to slow down.

According to another aspect of the invention, the fan and the fan installed on the flow path inside the duct; and a motor for rotating the fan; And a control device for accelerating or decelerating the rotational speed of the motor in accordance with the increase or decrease of the static pressure in the duct to provide a constant airflow amount in the air conditioning region, comprising: (a) a target rotational speed of the motor; Inputting; (b) Measuring the current rotational speed of the motor in operation, estimating the static pressure in the current duct by using the value, and determining the actual rotational speed of the actual motor identified through the self test run according to the estimated static pressure, and inputting the target rotation Comparing the speed with the measured current rotation speed; And (c) decelerating the rotational speed of the motor when the target rotational speed is greater than the current rotational speed, and decelerating the rotational speed of the motor when the target rotational speed is less than the current rotational speed. A control method is provided.

Herein, the control device instructs the target rotational speed of the motor, converts the rotational speed of the motor into a PMW signal having a duty value according to the control unit comparing the measured current rotational speed of the motor and the input rotational speed of the motor. It may include a motor driving unit for driving.

The controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and maintains the current rotational speed of the motor when the average duty value is included in the constant wind amount duty interval determined through trial run. Can be.

Alternatively, the controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and when the average duty value has a value larger than the maximum value of the constant air flow rate duty period determined through trial run. The rotation speed of the motor may be accelerated, and the rotation speed of the motor may be slowed down when the average duty value is smaller than the recovery value of the constant wind amount duty period determined through the trial run.

As described above, according to the ventilation apparatus and the control method thereof according to the present invention, it is possible to provide a sufficient amount of ventilation even when the constant pressure in the duct is increased by providing a constant air flow rate.

In addition, the ventilator and the control method according to the present invention obtains the desired amount of constant air flow with only the current and speed information of the fan load motor without using a separate static pressure sensor or a control device for measuring and feeding back the discharged air flow rate value, The self-calibration of the fan's operating characteristics in real time using the fan load motor's operating current and speed information obtained through self-testing can provide more precise static air flow.

In addition, the ventilator and the control method according to the present invention can maintain a constant ventilation amount by accelerating the rotational speed of the fan motor when the static pressure in the duct increases with the increase in the external wind pressure, when the static pressure in the duct decreases By reducing the rotation speed of the fan motor, unnecessary power consumption can be prevented.

The present invention provides a duct in which a flow path for flowing indoor or outdoor air to an outdoor space or an indoor space is formed; A fan provided at one side of the duct and configured to exhaust or supply indoor or outdoor air to an outdoor space or an indoor space; A motor for rotating the fan; And measuring the rotational speed of the motor in operation, estimating the static pressure in the current duct by using the value, and determining the target rotational speed of the actual motor determined through self-test according to the estimated static pressure to accelerate the current rotational speed of the motor. Or it relates to a ventilator comprising a control device for slowing down.

Here, the ventilation device according to an embodiment of the present invention may be configured such that the duct includes an air supply duct and an exhaust duct, and the fan includes an air supply fan and an exhaust fan respectively mounted in the air supply duct and the exhaust duct. One or more air supply fan and exhaust fan may be installed, and the air supply fan and the exhaust fan may be connected to the air supply motor and the exhaust motor, respectively.

Hereinafter, a ventilation apparatus and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings show exemplary forms of the present invention, which are provided to explain the present invention in more detail, and the technical scope of the present invention is not limited thereto.

In addition, irrespective of the reference numerals, the same or corresponding components will be given the same reference numerals, and redundant description thereof will be omitted. For convenience of description, the size and shape of each component may be exaggerated or reduced. have.

1 is a main configuration diagram of a ventilation device according to an embodiment of the present invention.

Referring to FIG. 1, a ventilation device 10 according to an embodiment of the present invention may include an air supply duct 10 and an air supply duct 10 forming an air supply flow path 5a for sucking outdoor air into an indoor space. And an exhaust duct 20 that crosses and forms an exhaust passage 5b for exhausting indoor air to the outdoor space.

Here, the air supply duct 10 and the exhaust duct 20 may be provided in a box-shaped housing (not shown), the air supply duct 10 is in communication with the outdoor air to suck the outdoor air at both ends An inlet 11 and an air supply outlet 13 for discharging the intake air into the indoor space are respectively formed.

In addition, the exhaust duct 20 is provided with an exhaust inlet 21 for communicating indoors at both ends and an exhaust outlet 23 for discharging the intake air to the outdoor space, respectively.

In addition, a filter (not shown) may be provided on the air supply passage 5a to filter foreign matter contained in outdoor air.

In addition, the ventilator 1 is provided at one side of the air supply duct 10 and provided at one side of the air supply fan 15 and the exhaust duct 20 to suck outdoor air into the indoor space, and exhausts indoor air to the outdoor space. It is provided in the exhaust fan 25 and the cross-sectional area 30 of the air supply duct 10 and the exhaust duct 20, and includes a total heat exchanger (5) for the heat exchange between the exhaust indoor air and the outdoor air sucked. .

Here, the indoor air and the outdoor air passing through the heat exchanger (5) are flowed unmixed, respectively, and heat exchanged with each other to supply the outdoor air at a temperature suitable for the room.

In addition, the ventilator 1 may be configured such that a bypass flow path (not shown) and the like are formed in the air supply flow path 5a and the exhaust flow path 5b to selectively perform the total heat exchange ventilation and the normal ventilation, and the air supply fan And one exhaust fan may be provided in consideration of the required air supply amount and the exhaust amount.

Looking at the ventilation process in the ventilation device 1 configured as described above, when the indoor air is somewhat contaminated, the power is applied to the exhaust fan 25, the indoor air is introduced into the exhaust duct 20 and discharged into the outdoor space, At the same time, fresh outdoor air is introduced into the indoor space through the air supply duct 10 while power is supplied to the air supply fan 15.

In addition, the ventilation device 1 includes an air supply motor (not shown) and an exhaust motor (not shown) for rotating the air supply fan 15 and the exhaust fan 25, respectively; And a control device 100 for controlling the rotational speed of at least one of the air supply motor and the exhaust motor in response to the static pressure fluctuation.

Here, the control device may include a first control device and a second control device, wherein the first and second control devices may be connected to the air supply motor and the intake motor, respectively. That is, a control device may be connected to each motor, respectively, and may control only the rotational speed of any one motor, and may simultaneously control the rotational speeds of the air supply motor and the intake motor as necessary.

Hereinafter, since the control apparatus and control method of the intake motor and the exhaust motor are the same, the intake motor and the exhaust motor are referred to as a motor 130 and will be described in detail.

The motor 130 may include a DC brush motor, a brushless DC (BLDC) motor, a permanent magnet syncronous motor (PMSM), a synchronous motor, an induction motor, a reluctance motor, and a stepping motor. Stepping motors, ultrasonic motors, linear motors, and the like can be used in various ways, but in the present embodiment, a BLDC motor is limited.

The brushless (BL) DC motor is a motor that generally installs an armature winding in a rotor and a stator in a rotor and determines a current direction of the winding by using a sensor. In general, the direction change of the current is three-phase or four-phase. An inverter is used.

In addition, BLDC motor has a relatively high torque at low speed and high speed, and can be rotated at high speed.Because the coil current is driven by a semiconductor device, it has a very long life, generates little noise and noise, and can directly adjust the speed at the driving part. It is very suitable as blower motor of air conditioner such as equipment.

2 and 3 is a conceptual diagram showing the main configuration of the ventilation device according to an embodiment of the present invention, the configuration for driving the motor 130 constituting the ventilation device of the present invention is shown.

The air supply fan 15 and the exhaust fan 25 are driven by the respective motors 130, the speed of which is controlled by the control device 100.

The control device 100 measures the rotational speed of the motor 130 in operation, estimates the static pressure in the current duct by using the value, and determines the target rotational speed of the actual motor determined through the self test operation according to the estimated static pressure. To accelerate or decelerate the current rotational speed of the motor.

In addition, the control device 100 measures the operating current and the rotational speed of at least one of the air supply motor and the exhaust motor to provide a positive air flow amount, and estimates the static pressure in the current duct by using the value as the estimated static pressure. Accordingly, the target rotational speed of the actual motor determined through the self-test can be determined to accelerate or decelerate the current rotational speed of the motor.

Here, the control device 100 accelerates the rotational speed of the motor when the target rotational speed is greater than the current rotational speed of the motor 130, and the rotation of the motor 130 when the control device 100 has a value smaller than the current rotational speed Slow down the speed.

Referring to FIG. 2, the control device 100 may include a motor driver 120 for applying a driving pulse to the motor 130 and a controller 110 for controlling the operation of the motor driver 120. have.

Specifically, the control device 100 indicates the target rotational speed (RPM) of the motor 130, and compares the measured current rotational speed (RPM) of the motor 130 and the target of the input motor The motor driving unit 120 may convert the rotational speed of the motor into a PMW signal having a duty value to drive the motor according to the rotational speed.

Referring to FIG. 3, the motor driver 120 corresponds to a rectifier (not shown) for converting an AC voltage into a DC voltage, a target rotational speed (target RPM) of the motor input from the controller, and a rotational speed of the motor. The driving circuit unit 121 modulates the DC voltage rectified by the rectifying unit into a PWM voltage having a duty value according to the duty value, and the PWM voltage is changed into a three-phase voltage and applied to the motor 130. It may include a Hall sensor unit 123 to measure the rotational speed of the inverter unit 122 and the motor 130 and transmit the value to the driving circuit unit 121.

The motor driver 121 generates a PWM signal such that the DC voltage generated from the rectifier is a voltage size corresponding to the three-phase voltage applied to the motor. The width of the PWM signal is determined by the target rotational speed (operation frequency) and the duty value of the motor applied by the controller.

The inverter unit 122 is a switch device for applying a driving voltage to the motor 130. The inverter unit 122 receives a PWM signal and converts a DC voltage into a three-phase voltage, The motor 130 is rotated by supplying a phase voltage to form a magnetic field.

As the motor 130 is rotated as described above, a counter electromotive force is generated in the winding of the motor 130. The counter electromotive force is detected by the Hall sensor unit 123 to detect the position of the rotor. ) Can measure the current rotation speed.

Here, the control device 100 obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and the current rotation of the motor when the average duty value is included in the static air flow rate duty interval determined through the trial run. Maintain speed.

In contrast, the control device 100 accelerates the rotational speed of the motor when the average duty value is greater than the maximum value of the static air flow rate duty interval determined through the trial run, and the average duty value is subjected to the trial run. When it has a value smaller than the found value of the determined static air flow rate duty period, the rotation speed of the motor is decelerated.

Hereinafter, in order to explain a specific control operation of the control device 100, a static pressure-airflow relationship between the ventilation device and the fan will be described.

4 is a graph showing the static pressure-air volume relationship of the ventilation apparatus according to the embodiment of the present invention.

Referring to Figure 4 (a), the target air flow rate (Q1, the ventilation amount) is determined at the intersection of the increase line (L1 and L2) indicating the static pressure-air flow rate of the ventilator and the static pressure-air flow characteristic (A) of the fan, If the static pressure in the duct increases (L1-> L2) when the wind pressure increases and fluctuates, the actual ventilation amount Q2 is determined to be lower than the target air volume Q1.

In the control method of the ventilator according to an embodiment of the present invention, the rotational speed of the motor is accelerated even when the static pressure is increased (L1-> L2) by the external wind in the state where the target air volume Q3 is fixed (static air volume). The control can change the constant pressure-flow rate characteristic (B) of the fan.

Constant air flow refers to the amount of air flow without departing from the range between the maximum reference air flow and the minimum reference air flow in the range of fluctuation between the highest static pressure and the lowest static pressure. The amount of air supplied is kept constant.

Since the air volume is proportional to the air speed, it is possible to maintain a constant air volume regardless of the static pressure fluctuation by adjusting the air speed, where the present invention does not measure the air speed, and the load current and rotation of the motor 130 corresponding thereto. Obtain the speed so that a constant amount of air is maintained.

In addition, the rotational speed, the static pressure, and the air volume of the motor can be grasped through self-testing. That is, when the rotational speed of the motor is known, the present static pressure and the amount of wind may be known, and conversely, the target rotational speed of the motor for obtaining the required amount of air based on the current static pressure may be known.

Hereinafter, the control method of the motor according to the static pressure variation in the duct of the ventilator 1 having the above structure will be described in detail.

5 and 6 are flowcharts illustrating a control method of a ventilation device according to an embodiment of the present invention.

Referring to Figure 5, the control method of the ventilation apparatus according to an embodiment of the present invention (a) inputting a target rotational speed of the motor (S10); (b) Measuring the current rotational speed of the motor in operation, estimating the static pressure in the current duct by using the value, and determining the actual rotational speed of the actual motor identified through the self test run according to the estimated static pressure, and inputting the target rotation Comparing the speed with the measured current rotation speed (S20); And (c) decelerating the rotational speed of the motor when the target rotational speed is greater than the current rotational speed (S40), and accelerating the rotational speed of the motor (S30) when the target rotational speed is smaller than the current rotational speed. It includes.

Meanwhile, since the control device is the same as the control device 100 described with reference to FIGS. 2 and 3, detailed description thereof will be omitted.

Referring to FIG. 6, in the controller, a duty value (duty indicating voltage) corresponding to the target rotational speed (RPM) of the motor and the rotational speed of the motor is input to the motor driving unit (S100), and the current rotational speed of the motor in the motor driving unit. (RPM) is measured and the duty value corresponding to the rotational speed of the current motor is transmitted to the controller.

The controller may set a sampling time and a response time, and when the set sampling time is reached (S200), the controller calculates an average duty value (S300). The average duty value is a value obtained by dividing the sum of the duty values during the sampling time by the sampling time. At this time, the air volume is fixed constantly, and the rotational speed (operation frequency) of the motor is varied according to the variable static pressure.

On the other hand, the control unit compares the current rotational speed of the motor measured by the Hall sensor unit and the motor transmitted from the motor driving unit with the target rotational speed of the motor delivered to the driving circuit unit (S400), and transmits the pad back to the driving circuit unit.

The feedback is performed by maintaining the current speed of the motor (S500) when the average duty value is included in the range of the preset duty value.

On the other hand, if the average duty value is not included in the predetermined constant air volume duty range, it is determined whether the average duty value is included in an upper section of the predetermined constant air volume duty interval (S600).

As described above, the rotational speed of the motor according to the change of the static pressure can be obtained experimentally while the air flow rate is fixed. According to this table, the preset duty value (static air flow duty value) according to the static pressure is a section (range). appear.

Therefore, by using the table, it is possible to estimate the current static pressure through the average duty value, and to determine the actual target rotational speed (RPM) of the motor using the data obtained through the existing experiment based on the estimated static pressure, The amount of airflow control of the ventilation device is performed by inputting the compensation value compared with the rotational speed RPM of the current motor being input to the motor driving unit during the sampling time.

On the other hand, the preset duty value represents a constant air flow rate duty value, the constant air flow rate duty value can be determined experimentally according to the static pressure and the air flow rate, and the static pressure-air flow rate characteristics can also be determined experimentally. In addition, the duty value is controlled by outputting the motor driving voltage for performing the pulse width control, and the duty value and the driving voltage of the driving pulse have linearity, so that the duty value is in proportion to the rotational speed of the motor.

The feedback decelerates the rotational speed of the motor (S700) when the average duty value is greater than the upper range than the preset duty value range, that is, the value is larger than the maximum value of the range of the constant airflow duty value (S700). When the value has a value lower than a lower section than the range of the preset duty value, that is, a value smaller than the minimum value of the range of the constant wind amount duty value, the rotation speed of the motor is accelerated (S800).

As described above, the ventilator and the control method thereof according to the present invention can provide a constant air flow rate and thus provide a sufficient amount of ventilation even when the static pressure in the duct increases.

Also, without using a separate static pressure sensor or a control device that measures and feeds back the amount of discharged air, it obtains the desired amount of static air by using only the current and speed information of the fan load motor, and operates the fan load motor that is grasped through self-testing. Current and speed information can be used to self-calibrate the fan's operating characteristics in real time to provide more precise airflow.

In addition, when the static pressure in the duct increases as the external wind pressure increases, it is possible to maintain a constant ventilation amount by accelerating the rotational speed of the fan motor. It can prevent.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the following claims.

1 is a main configuration diagram of a ventilation device according to an embodiment of the present invention.

2 and 3 is a conceptual diagram showing the main configuration of the ventilation device according to an embodiment of the present invention.

Figure 4 is a graph showing the pressure-air flow relationship of the ventilation device according to an embodiment of the present invention.

5 and 6 is a flow chart showing a control method of the ventilation device according to an embodiment of the present invention.

Claims (10)

An air supply duct forming an air supply passage for sucking outdoor air into the indoor space, and an air exhaust duct intersecting with the air supply duct and forming an air exhaust passage for exhausting indoor air into the outdoor space; An air supply fan provided on one side of the air supply duct to suck outdoor air into the indoor space, and an air exhaust fan provided on one side of the exhaust duct to exhaust indoor air to the outdoor space; An electrothermal heat exchanger provided at an intersection area of the air supply duct and the air exhaust duct, the heat exchanger for exchanging indoor air to be exhausted and outdoor air to be sucked; An air supply motor and an exhaust motor which rotate the air supply fan and the exhaust fan, respectively; And In order to provide a constant air flow, the operating current and the rotational speed of at least one of the air supply motor and the exhaust motor are measured, the value of the current is estimated by the static pressure in the duct, and the actual motor obtained through self-testing according to the estimated static pressure. And a controller for determining a target rotational speed of the controller to accelerate or decelerate the current rotational speed of the motor. The method of claim 1, And the control device accelerates the rotational speed of the motor when the target rotational speed is greater than the current rotational speed of the motor, and decelerates the rotational speed of the motor when the control device has a value smaller than the current rotational speed. The method of claim 1, The control device instructs the target rotational speed of the motor, converts the rotational speed of the motor into a PMW signal having a duty value according to the control unit comparing the measured current rotational speed of the motor and the input motor target rotational speed to drive the motor. Ventilation apparatus comprising a motor driving unit to. The method of claim 3, wherein The controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and maintains the current rotational speed of the motor when the average duty value is included in the constant wind amount duty interval determined through trial run. Ventilation apparatus characterized in that. The method of claim 3, wherein The controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and rotates the motor when the average duty value is larger than the maximum value of the constant air flow rate duty period determined through trial run. And accelerating the speed, and decelerating the rotational speed of the motor when the average duty value is smaller than the recovery value of the constant wind amount duty period determined through the trial run. A duct in which a flow path for flowing indoor or outdoor air to an outdoor space or an indoor space is formed; A fan provided at one side of the duct and configured to exhaust or supply indoor or outdoor air to an outdoor space or an indoor space; A motor for rotating the fan; And Measure the rotational speed of the motor in operation, estimate the static pressure in the current duct by using the value, and determine the target rotational speed of the actual motor identified through the self test according to the estimated static pressure to accelerate the current rotational speed of the motor or A ventilator comprising a control device to slow down. A fan installed on the flow path inside the duct; and a motor for rotating the fan; And a control device for accelerating or decelerating the rotational speed of the motor in accordance with the increase or decrease of the static pressure in the duct so as to provide a constant air volume in the air conditioning region. (a) inputting a target rotational speed of the motor; (b) Measuring the current rotational speed of the motor in operation, estimating the static pressure in the current duct by using the value, and determining the actual rotational speed of the actual motor identified through the self test run according to the estimated static pressure, and inputting the target rotation Comparing the speed with the measured current rotation speed; And (c) decelerating the rotational speed of the motor when the target rotational speed is greater than the current rotational speed, and decelerating the rotational speed of the motor when the target rotational speed is less than the current rotational speed. Way. The method of claim 7, wherein The control device instructs the target rotational speed of the motor, converts the rotational speed of the motor into a PMW signal having a duty value according to the control unit comparing the measured current rotational speed of the motor and the input motor target rotational speed to drive the motor. A control method of a ventilation device comprising a motor driving unit to. The method of claim 8, The controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and maintains the current rotational speed of the motor when the average duty value is included in the constant wind amount duty interval determined through trial run. Method of controlling the ventilation device, characterized in that. The method of claim 8, The controller obtains an average duty value measured from the motor during the sampling time, estimates the current static pressure value, and rotates the motor when the average duty value is larger than the maximum value of the constant air flow rate duty period determined through trial run. And accelerating the speed and decelerating the rotational speed of the motor when the average duty value is smaller than the recovery value of the static air flow rate duty period determined through the trial run.

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