JP2003148788A - Outdoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor unit of an air conditioner which controls the drive in the forward direction and in the reverse direction of a fan motor according to the direction and the intensity of the outside wind, and saves on the energy by driving the fan motor with a small load state. SOLUTION: In the outdoor unit of the air conditioner with a blower driven by the fan motor having a position detection element of a rotor mounted thereon, the number of revolution of the fan motor rotated by the outside wind while the outdoor unit is stopped is detected by the signal from the position detection element of the rotor. If the number of revolution of the fan motor is not less than the required value for the outdoor unit when the operation of the outdoor unit is started, the fan motor is not driven, but the operation of the outdoor unit is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a DC fan motor used in an outdoor unit of an air conditioner.

[0002]

2. Description of the Related Art FIGS.
It is a figure which shows the conventional air conditioning apparatus shown by the 129 publication, FIG. 3 is a block diagram of an air conditioning apparatus, and FIG. 4 is a figure which shows the control circuit which performs rotation control of a fan. In FIG. 3, 1
Is an outdoor unit outer casing, 2 is a heat exchanger arranged in an L-shape inside the outdoor unit, 3 and 4 are air suction ports provided on the back and side surfaces of the outdoor unit outer casing 1, and 6 is driven by a fan motor 30. A fan, 7 is an air outlet provided on the front surface of the outdoor unit outer casing 1, 8 is a compressor for compressing the refrigerant, 31 is a wind pressure sensor provided on the front face of the outdoor unit outer casing 1, and detects the wind pressure outside the fan 6. Is.

In FIG. 4, 32 is a compressor motor, 33 is a relay for energizing the fan motor 30 and the compressor motor 32, 34b is a relay for switching the power supply phases connected to the fan motor 30, and 34a is a relay 34b. The operation coil 35 is a switch for energizing the operation coil 34a.

The wiring for the power supply of the fan motor 30 is the relay 3
4b, and when the switch 35 for energizing the operation coil 34a is off, in FIG. 3, the fan 6 is operated so as to suck air from the air suction ports 3 and 4 and blow air from the air blowing port 7. Rotation is performed to blow air to the heat exchanger 2 for heat exchange.

When the switch 35 for energizing the operation coil 34a is turned on, the air outlet 7 is shown in FIG.
The fan 6 is rotated so that air is sucked from the air and blown out from the air suction ports 3 and 4, and the air is blown to the heat exchanger 2 to cause heat exchange.

The operation of this air conditioner will be described. When the operation of the air conditioner is started, the relay 33 that energizes the fan motor 30 and the compressor motor 32 is turned on. Then, the compressor motor 32 is energized to operate the compressor 8, and the fan motor 30 is also energized to suck the air from the air suction ports 3 and 4 and blow the air from the air blowing port 7 to the fan 6. The fan motor 30 rotates so as to operate, and blows air to the heat exchanger 2 for heat exchange.

On the other hand, the switch 35 for energizing the operation coil 34a is operated by the wind pressure detected by the wind pressure sensor 31. When the wind pressure sensor 31 detects a predetermined wind pressure or more, the switch 35 for energizing the operation coil of 34a is turned on, and when the wind pressure sensor 31 detects a predetermined wind pressure or less, the operation coil 34a.
Control is performed so as to turn off the switch 35 for energizing the device.

Therefore, a reverse wind is applied to the outdoor unit, that is, as shown in FIG.
When a certain amount of wind is blowing in the direction of, the fan 6 can be rotated in the reverse direction, and when the wind is backwinding, there is a problem such as a decrease in the capacity of the air conditioner due to a decrease in the heat exchange capacity due to a decrease in the air volume to the heat exchanger 2. Is avoiding.

[0009]

In the conventional air conditioner, in order to perform normal rotation and reverse rotation of the fan motor, in addition to the motor, a relay for changing the power supply phase connected to the motor, a switch for operating this relay, and a reverse wind. There is a problem that a wind pressure switch for detecting the state is required and the number of parts is large.
In addition, there is a problem that a space for mounting these parts is required.

The present invention has been made in order to solve the above-mentioned problems and is realized by a small number of parts for controlling the forward and reverse rotation of the fan motor in accordance with the direction and strength of the external wind. However, it is an object of the present invention to provide an outdoor unit for an air conditioner that can save energy by driving a fan motor with a light load.

[0011]

An outdoor unit for an air conditioner according to the present invention is an outdoor unit for an air conditioner equipped with a blower driven by a fan motor having a rotor position detecting element. The rotation speed of the fan motor that rotates due to outside wind is detected by the signal from the rotor position detection element, and the rotation speed of the fan motor is required by the outdoor unit when the operation of the outdoor unit is started. When the number of rotations is equal to or higher than the number of rotations, the operation of the outdoor unit is started without driving the fan motor.

Further, in the outdoor unit for an air conditioner according to the present invention, the outdoor unit is provided with a heat exchanger for a refrigeration cycle, and if the amount of air required for the heat exchanger is secured by the outside air, the fan motor is driven. The feature is that the operation of the outdoor unit is started without doing so.

Further, in the outdoor unit of the air conditioner according to the present invention, the outdoor unit includes a heat exchanger of the refrigeration cycle and a cooler for cooling the electric parts, and the amount of air required for the heat exchanger depends on the outside air. When the temperature is secured and the temperature of the cooler is equal to or lower than a predetermined value, the operation of the outdoor unit is started without driving the fan motor.

The outdoor unit for an air conditioner according to the present invention is characterized in that a temperature sensor is attached to the cooler to detect the temperature of the cooler.

Further, in the outdoor unit of the air conditioner according to the present invention, when the rotation speed of the fan motor due to the outside wind while the outdoor unit is stopped is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, The feature is that the air volume required for the heat exchanger is secured by the outside air.

Further, the outdoor unit of the air conditioner according to the present invention is characterized in that the fan motor is a DC brushless motor.

Further, the outdoor unit of the air conditioner according to the present invention is characterized in that the fan motor is an induction motor.

The outdoor unit for an air conditioner according to the present invention is an outdoor unit for an air conditioner equipped with a blower using a DC brushless motor as a drive motor, and the DC brushless motor is driven by outside wind while the outdoor unit is stopped. If the rotation speed of the DC brushless motor is equal to or higher than the rotation speed required by the outdoor unit when the operation of the outdoor unit is started, the DC brushless motor is not driven. When the number of rotations of the DC brushless motor becomes lower than the number of rotations required by the outdoor unit during the operation of the outdoor unit is started, the DC brushless motor is rotated in the detected rotation direction. .

Further, the outdoor unit of the air conditioner according to the present invention is characterized in that the rotating direction and the rotating speed of the DC brushless motor are detected by a signal from the position detecting element of the rotor provided in the DC brushless motor. And

Further, in the outdoor unit of the air conditioner according to the present invention, the rotating direction and the rotating speed of the DC brushless motor are calculated from the induced voltage generated in the stator winding when the DC brushless motor is rotated and the driving DC power supply. It is characterized in that the position is detected by a reference voltage that is set.

The outdoor unit for an air conditioner according to the present invention is provided with a heat exchanger for a refrigeration cycle, and the amount of air required for the heat exchanger when the operation of the outdoor unit is started is ensured by the outside air. For example, if you start the operation of the outdoor unit without driving the DC brushless motor and the outside air does not supply enough air to the heat exchanger during operation, it is recommended to rotate the DC brushless motor in the detected rotation direction. Characterize.

The outdoor unit for an air conditioner according to the present invention is provided with a heat exchanger for a refrigeration cycle and a cooler for cooling electric parts, and is required for the heat exchanger when the operation of the outdoor unit is started. If a sufficient amount of air is secured by the outside air and the temperature of the cooler is below the specified value, the operation of the outdoor unit is started without driving the DC brushless motor, and the amount of air needed for the heat exchanger is kept outside during operation. When the wind is insufficient, or when the temperature of the cooler exceeds a predetermined value, the DC brushless motor is rotated in the detected rotation direction.

Further, in the outdoor unit of the air conditioner according to the present invention, when the rotation speed of the fan motor due to the outside air while the outdoor unit is stopped is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, If the air volume required for the heat exchanger is secured by the outside air, and the fan motor rotation speed becomes lower than the command value of the rotation speed command signal during operation, the air volume required for the heat exchanger will be the outside air. It is characterized in that it is insufficient.

Further, the outdoor unit of the air conditioner according to the present invention has an air suction port for sucking outside air into the outdoor unit outer shell, and an air blowing port for blowing outside air passing through the outdoor unit to the outside. When the brushless motor is rotating forward, the blower is driven so that the outside air is sucked in through the air inlet and blown out from the air outlet, and the rotation speed of the DC brushless motor during operation is the rotation required by the outdoor unit. When the number of rotations is equal to or smaller than the number, if the detected rotation direction is forward rotation, the DC brushless motor is forwardly rotated.

Further, the outdoor unit of the air conditioner according to the present invention has an air suction port for sucking outside air into the outdoor unit outer shell, and an air blowing port for blowing outside air passing through the outdoor unit to the outside. When the brushless motor rotates in the reverse direction, the blower is driven so that the outside air is sucked in from the air outlet and blown out from the air inlet, and the rotation speed of the DC brushless motor during operation is the rotation required by the outdoor unit. If the detected rotation direction is the reverse rotation when the number becomes equal to or smaller than the number, the DC brushless motor is reversely rotated.

Further, the outdoor unit of the air conditioner according to the present invention is equipped with a blower using a DC brushless motor as a drive motor, and detects the rotating direction of the DC brushless motor due to the outside air while the outdoor unit is stopped. Every other time, when the outdoor unit starts operating, the DC brushless motor is rotated in the detected rotation direction.

Further, the outdoor unit of the air conditioner according to the present invention is characterized in that the rotation direction of the DC brushless motor is detected by a signal from the position detecting element of the rotor provided in the DC brushless motor.

Further, in the outdoor unit of the air conditioner according to the present invention, the rotating direction of the DC brushless motor is such that the induced voltage generated in the stator winding when the DC brushless motor rotates and the reference voltage generated from the driving DC power supply. It is characterized in that the position is detected by detecting the position.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 and 2 are views showing a first embodiment, FIG. 1 is a configuration diagram of an air conditioner, and FIG. 2 is a diagram showing a control circuit of a DC fan motor. In FIG. 1, 1 is an outer unit outer shell, 2 is an L-shaped heat exchanger arranged in the outdoor unit,
Reference numeral 4 is an air intake port provided on the back and side surfaces of the outdoor unit outer casing 1, and 5 is a DC fan motor for driving the fan 6, which is a DC brushless motor. Reference numeral 7 is an air outlet provided on the front surface of the outdoor unit outer casing 1, 8 is a compressor for compressing a refrigerant, 9 is an electrical component box in which a device for controlling the outdoor unit is stored, and 10 is attached to the electrical component box 9. This is a cooler for the purpose of cooling the electric parts and arranged at a place cooled by the flow of air generated by the rotation of the fan 6.

When the DC fan motor 5 rotates in the forward direction, air is sucked through the air suction ports 3 and 4, and the fan 6 is rotated so as to blow out air from the air blowout port 7 to blow air to the heat exchanger 2. Then, the heat is exchanged and the cooler 10 is cooled for the purpose of cooling the electric parts.

When the DC fan motor 5 rotates in the reverse direction,
The fan 6 is operated so as to suck in air from the air outlet 7 and blow out air from the air inlets 3 and 4 to blow air to the heat exchanger 2 for heat exchange and to cool electric parts. The cooler 10 is cooled.

In FIG. 2, reference numeral 21 designates a DC power source, 22 designates a DC power source 21 into a three-phase AC power source and transforms it into a DC fan motor 5
A switching element for supplying electric power to the DC fan motor 5, 23 for position detecting means for detecting the magnet position of the DC fan motor 5 in accordance with a signal from a rotor position detecting element previously attached to the DC fan motor 5, and 24 for the position detecting means 23. A rotation speed detection means for detecting the rotation speed of the DC fan motor 5 by a signal, a rotation direction detection means 25 for detecting the rotation direction of the DC fan motor 5 by a signal from the position detection means 23, and 26 for operating the air conditioner. It is a drive signal output means for giving a drive signal to the switching element 22 for supplying electric power to the DC fan motor 5 by the required rotation speed command signal and the signals from the rotation speed detecting means 24 and the rotation direction detecting means 25.

The position detecting means 23 is a position detecting means for detecting the position of the position detecting magnet of the DC fan motor 5 in response to a signal from a rotor position detecting element previously attached to the DC fan motor 5. Fan motor 5
Even if the rotor position detecting element is not provided in advance, position detection may be performed by the induced voltage generated when the DC fan motor 5 rotates and the reference voltage generated from the driving DC power supply.

Next, the DC fan motor 5 having the above structure
The control of will be described. Immediately before the start of the operation of the air conditioner, if the rotation speed of the DC fan motor 5 detected by the rotation speed detection means 24 is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, the rotation direction detection means 25 detects it. When the rotating direction of the DC fan motor 5 is reverse rotation, it is determined that the air volume necessary for heat exchange in the heat exchanger 2 of the outdoor unit is secured, and at the start of the operation of the outdoor unit, the drive signal output means. The compressor 8 is operated while the DC fan motor 5 is stopped without outputting a drive signal from 26, and the operation of the outdoor unit is started.

That is, this is a case where the wind around the outdoor unit is a reverse wind blown to the air outlet 7 provided on the front face of the outdoor unit outer shell 1, and the amount of air required for heat exchange in the heat exchanger 2 of the outdoor unit is caused by this reverse wind. If it is ensured, the DC fan motor 5 is not operated, and energy is saved.

On the other hand, immediately before the start of operation, the rotation speed detection means 2
When the rotation speed of the DC fan motor 5 detected in 4 is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit,
DC fan motor 5 detected by the rotation direction detecting means 25
When the direction of rotation of the unit is forward rotation, the heat exchanger 2 of the outdoor unit
It is determined that the amount of air required for heat exchange is secured and the compressor 8 is operated while the DC fan motor 5 is stopped without outputting a drive signal from the drive signal output means 26 at the start of operation of the outdoor unit. , Start operation of the outdoor unit.

In this case, the wind around the outdoor unit is a normal wind blown to the air suction ports 3 and 4 provided on the front surface of the outdoor unit outer shell 1, and the heat exchanger 2 of the outdoor unit is heated by this wind.
If the amount of air required for heat exchange is secured, the DC fan motor 5 is not operated, and energy is saved.

According to the above-described embodiment, when the air volume required for heat exchange in the heat exchanger 2 of the outdoor unit is secured by the outside air at the start of the operation of the air conditioner, the DC fan motor 5 is stopped. Since the operation of the outdoor unit is started with it left,
It is possible to save energy.

Although the DC fan motor is used as the fan motor in the above-described embodiments, the present invention is not limited to this. An AC fan motor (for example, an induction motor) having a rotor position detecting element is provided. However, the same effect can be obtained.

Embodiment 2. The diagram showing the configuration of the present embodiment is the same as that of the first embodiment, and therefore its explanation is omitted.
Similar to the control of the DC fan motor of the first embodiment, the rotation speed of the DC fan motor 5 detected by the rotation speed detection means 24 immediately before the start of operation is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit. In this case, when the rotation direction of the DC fan motor 5 detected by the rotation direction detecting means 25 is reverse rotation, the amount of air required for heat exchange in the heat exchanger 2 of the outdoor unit is secured by the outside wind (back wind). When the operation of the outdoor unit is started, the drive signal is not output from the drive signal output means 26 and the compressor 8 is operated while the DC fan motor 5 is stopped to start the operation of the outdoor unit.

Further, when the air volume required for heat exchange in the heat exchanger 2 during operation becomes large, for example, when the input value from the rotation speed detecting means 24 becomes smaller than the command value of the rotation speed command signal. Is reverse to the switching element 22 that supplies electric power from the drive signal output means 26 to the DC fan motor 5, that is, sucks air from the air outlet 7 on the front surface of the outdoor unit, and the air inlets 3 on the rear and side surfaces of the outdoor unit, 4 outputs a signal for driving the DC fan motor 5 so as to rotate the fan 6 so as to blow air from the motor 4.

That is, if it is necessary to operate the DC fan motor 5 if the DC fan motor 5 is reversely rotated by the back wind before the operation of the DC fan motor 5 is started,
By driving the DC fan motor 5 so as to rotate in the reverse direction, the DC fan motor 5 operates in a light load state, so that the power consumption can be reduced.

On the other hand, immediately before the start of operation, the rotation speed detecting means 2
When the rotation speed of the DC fan motor 5 detected in 4 is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit,
DC fan motor 5 detected by the rotation direction detecting means 25
When the direction of rotation of the unit is forward rotation, the heat exchanger 2 of the outdoor unit
It is determined that the amount of air required for heat exchange in the room is secured by the outside air (normal wind), and when the operation of the outdoor unit is started, the drive signal output means 26 does not output the drive signal and the DC fan motor 5 remains stopped. The compressor 8 is operated and the operation of the outdoor unit is started.

Further, when the air volume required for heat exchange in the heat exchanger 2 of the outdoor unit during operation becomes large, for example, the input value from the rotation speed detecting means 24 is smaller than the command value of the rotation speed command signal. In the event that the driving signal output means 26 is turned off, the switching element 22 for supplying power from the drive signal output means 26 to the DC fan motor 5
In contrast, the DC fan motor 5 is driven to rotate in the normal direction, that is, to rotate the fan 6 so as to suck air from the air suction ports 3 and 4 on the back and side of the outdoor unit and blow out air from the air outlet 7 on the front of the outdoor unit. To output the signal.

That is, if the DC fan motor 5 is rotated forward by normal wind before starting the operation of the DC fan motor 5, if it becomes necessary to operate the DC fan motor 5,
By driving the DC fan motor 5 so as to rotate in the normal direction, the DC fan motor 5 is operated in a light load state, so that the power consumption can be reduced.

According to the above-described embodiment, the rotation direction due to the external wind before the operation of the DC fan motor 5 is detected, and when it is necessary to operate the DC fan motor 5, the detected rotation direction is detected. By driving the DC fan motor 5 to a low level, the DC fan motor 5 can be operated with a light load, thereby reducing power consumption.

Embodiment 3. The diagram showing the configuration of the present embodiment is the same as that of the first embodiment, and therefore its explanation is omitted.
In FIG. 1, a cooler 10 for cooling electric parts is attached to an electric component box 9 in which a device for controlling an outdoor unit is stored.
, A temperature sensor for detecting the temperature of the cooler 10 is attached to detect the temperature of the cooler 10 while the outdoor unit is stopped, and the direct current detected by the rotation speed detecting means 24 at the start of operation of the outdoor unit. The rotation speed of the fan motor 5 is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, and the cooler 1
When the temperature of 0 is below a predetermined value, the outdoor unit is operated without driving the DC fan motor 5.

Further, when the temperature of the cooler 10 exceeds a predetermined temperature during the operation of the outdoor unit with the DC fan motor 5 stopped, the rotation direction detected by the rotation direction detecting means 25 is reverse rotation. If there is, the drive signal output means 26 outputs an output for rotating the DC fan motor 5 in the reverse direction, and if the rotation direction detected by the rotation direction detection means 25 is a normal rotation, the drive signal output means 26 causes the DC fan motor 5 to rotate in the normal direction. Output.

According to the above-described embodiment, the number of rotations of the DC fan motor 5 due to the outside air is detected while the outdoor unit is stopped, and the amount of air required for the heat exchanger 2 is secured by the outside air and the electric When the temperature of the cooler 10 for cooling the electric components attached to the product box 9 is equal to or lower than a predetermined value, the air conditioner can be operated without operating the DC fan motor 5.
Energy saving operation is possible. Further, when the temperature of the cooler 10 becomes equal to or higher than a predetermined temperature during the operation of the outdoor unit, the DC fan motor 5 is driven so as to rotate in the reverse direction in advance, and the DC fan motor is rotated in the forward direction in advance if the temperature is normal. Motor 5
The DC fan motor 5 is driven by driving for normal rotation.
It is possible to reduce the power consumption by operating the load in a light state.

[0050]

The outdoor unit of the air conditioner according to the present invention is
If the rotation speed of the fan motor that rotates due to outside wind while the outdoor unit is stopped is greater than or equal to that required by the outdoor unit when the operation of the outdoor unit is started, the operation of the outdoor unit without driving the fan motor is performed. Power consumption can be reduced by starting.

Further, in the outdoor unit of the air conditioner according to the present invention, if the air volume required for the heat exchanger is secured by the outside air, the operation of the outdoor unit is started without driving the fan motor. The power consumption can be reduced.

The outdoor unit for an air conditioner according to the present invention does not drive the fan motor when the amount of air required for the heat exchanger is secured by the outside air and the temperature of the cooler is below a predetermined value. Power consumption can be reduced by starting the operation of the outdoor unit.

In the outdoor unit for an air conditioner according to the present invention, the temperature sensor can be attached to the cooler to easily detect the temperature of the cooler.

Further, in the outdoor unit of the air conditioner according to the present invention, when the rotation speed of the fan motor due to the outside wind while the outdoor unit is stopped is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, By assuming that the air volume required for the heat exchanger is secured by the outside air, accurate control can be performed.

Further, in the outdoor unit for an air conditioner according to the present invention, the fan motor is a DC brushless motor, so that high efficiency and low noise can be realized.

Further, the outdoor unit of the air conditioner according to the present invention can be made inexpensive because the fan motor is an induction motor.

Further, the outdoor unit of the air conditioner according to the present invention detects the rotational direction and the rotational speed of the DC brushless motor due to the external wind while the outdoor unit is stopped, and the rotational speed of the DC brushless motor is determined as the outdoor unit. If the number of revolutions required by the outdoor unit is higher than the number of revolutions required by the outdoor unit when the operation of the outdoor unit is started, start the operation of the outdoor unit without driving the DC brushless motor. When the number of revolutions is lower than the required number of revolutions, it is possible to reduce the power consumption by rotating the DC brushless motor in the detected direction of rotation, and to rotate the blower forward with a small number of parts.
The reverse can be achieved.

Further, in the outdoor unit for an air conditioner according to the present invention, the rotation direction and the number of rotations of the DC brushless motor are detected by the signal from the position detecting element of the rotor provided in the DC brushless motor, Forward and reverse rotation of the blower can be realized with a small number of parts.

Further, in the outdoor unit of the air conditioner according to the present invention, the rotating direction and the rotating speed of the DC brushless motor are determined by the induced voltage generated in the stator winding when the DC brushless motor is rotated and the driving DC power supply. By detecting the position by detecting the reference voltage, the forward and reverse rotation of the blower can be realized with a small number of parts.

The outdoor unit of the air conditioner according to the present invention does not drive the DC brushless motor if the amount of air required for the heat exchanger is secured by the outside air when the operation of the outdoor unit is started. When the outdoor unit starts operating and the air volume required for the heat exchanger is insufficient due to outside air during operation, power consumption can be reduced by rotating the DC brushless motor in the detected rotation direction. At the same time, it is possible to realize forward and reverse rotation of the blower with a small number of parts.

Further, in the outdoor unit of the air conditioner according to the present invention, the amount of air required for the heat exchanger when the operation of the outdoor unit is started is secured by the outside air, and the temperature of the cooler is below a predetermined value. In the case of starting the operation of the outdoor unit without driving the DC brushless motor and the amount of air required for the heat exchanger is insufficient with outside air during operation, or the temperature of the cooler exceeds a specified value. By rotating the DC brushless motor in the detected rotation direction, it is possible to reduce power consumption, and it is possible to realize forward and reverse rotation of the blower with a small number of parts.

Further, in the outdoor unit of the air conditioner according to the present invention, when the rotation speed of the fan motor due to the outside wind while the outdoor unit is stopped is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, If the air volume required for the heat exchanger is secured by the outside air, and the fan motor rotation speed becomes lower than the command value of the rotation speed command signal during operation, the air volume required for the heat exchanger will be the outside air. Therefore, it is possible to perform accurate control because it is insufficient.

Further, in the outdoor unit of the air conditioner according to the present invention, when the DC brushless motor is rotating forward, the blower is driven so that the outside air is sucked in through the air suction port and blown out through the air blowout port. If the rotation speed of the DC brushless motor becomes lower than the rotation speed required by the outdoor unit during operation and the detected rotation direction is forward rotation, the DC brushless motor is rotated forward to reduce power consumption. In addition, it is possible to realize forward rotation of the blower with a small number of parts.

Further, in the outdoor unit of the air conditioner according to the present invention, when the DC brushless motor is rotated in the reverse direction, the blower is driven so that the outside air is sucked in from the air outlet and blown out from the air inlet, When the rotation speed of the DC brushless motor becomes lower than the rotation speed required by the outdoor unit during operation, if the detected rotation direction is reverse rotation, the DC brushless motor is rotated reversely to reduce power consumption. In addition, it is possible to achieve reverse rotation of the blower with a small number of parts.

Further, the outdoor unit of the air conditioner according to the present invention detects the rotation direction of the DC brushless motor due to the outside wind while the outdoor unit is stopped, and when the outdoor unit starts the operation, the detected rotation direction. By rotating the DC brushless motor, the power consumption can be reduced and the fan can be rotated forward and backward with a small number of parts.

Further, in the outdoor unit of the air conditioner according to the present invention, the rotating direction of the DC brushless motor is detected by the signal from the position detecting element of the rotor provided in the DC brushless motor, thereby reducing the number of parts. The forward and reverse rotation of the blower can be achieved with.

Further, in the outdoor unit of the air conditioner according to the present invention, the rotating direction of the DC brushless motor is such that the induced voltage generated in the stator winding when the DC brushless motor rotates and the reference voltage generated from the driving DC power supply. By detecting the position by performing the position detection, it is possible to realize forward and reverse rotation of the blower with a small number of parts.

[Brief description of drawings]

FIG. 1 is a diagram illustrating Embodiments 1 to 3 and is a configuration diagram of an air conditioner.

FIG. 2 is a diagram showing first to third embodiments and is a diagram showing a control circuit of a DC fan motor.

FIG. 3 is a configuration diagram of a conventional air conditioner.

FIG. 4 is a diagram showing a control circuit for controlling rotation of a conventional blower.

[Explanation of Codes] 1 outdoor unit outer shell, 2 heat exchanger, 3, 4 air intake port, 5 DC fan motor, 6 fan, 7 air outlet port, 8 compressor, 9 electrical component box, 10 cooler, 2
1 DC power supply, 22 switching element, 23 position detecting means, 24 rotational speed detecting means, 25 rotational direction detecting means, 26 drive signal outputting means.

Claims (18)

[Claims] 1. An outdoor unit of an air conditioner equipped with a blower driven by a fan motor having a rotor position detection element, wherein the rotation speed of the fan motor rotated by the outside air while the outdoor unit is stopped is The fan motor is detected by a signal from the position detecting element of the rotor, and if the rotation speed of the fan motor is equal to or higher than the rotation speed required by the outdoor unit when the operation of the outdoor unit is started, An outdoor unit for an air conditioner, which starts the operation of the outdoor unit without driving the air conditioner. 2. The outdoor unit includes a heat exchanger for a refrigeration cycle, and if the amount of air required for the heat exchanger is ensured by the outside air, the fan unit is not driven to operate the outdoor unit. It starts, The outdoor unit of the air conditioner of Claim 1 characterized by the above-mentioned. 3. The outdoor unit includes a heat exchanger for a refrigeration cycle and a cooler for cooling electric parts, the amount of air required for the heat exchanger is secured by outside air, and the temperature of the cooler is The outdoor unit for an air conditioner according to claim 1, wherein when the predetermined value or less, the operation of the outdoor unit is started without driving the fan motor. 4. A temperature sensor is attached to the cooler,
4. The temperature of the cooler is detected.
The outdoor unit of the air conditioner described in. 5. When the rotation speed of the fan motor due to the outside air while the outdoor unit is stopped is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, the amount of air required for the heat exchanger is the outside air. The outdoor unit of the air conditioner according to claim 2 or 3, wherein the outdoor unit is an air conditioner. 6. The outdoor unit for an air conditioner according to claim 1, wherein the fan motor is a DC brushless motor. 7. The outdoor unit for an air conditioner according to claim 1, wherein the fan motor is an induction motor. 8. An outdoor unit of an air conditioner equipped with a blower using a DC brushless motor as a driving motor, wherein the rotation direction and the rotation speed of the DC brushless motor are detected by the outside air while the outdoor unit is stopped. If the rotation speed of the DC brushless motor is equal to or higher than the rotation speed required by the outdoor unit when the operation of the outdoor unit is started, the operation of the outdoor unit is performed without driving the DC brushless motor. When the number of rotations of the DC brushless motor is reduced to a value equal to or lower than the number of rotations required by the outdoor unit during operation, the DC brushless motor is rotated in the detected rotation direction. An outdoor unit of a harmony machine. 9. The air conditioner according to claim 8, wherein the rotation direction and the rotation speed of the DC brushless motor are detected by a signal from a position detecting element of a rotor provided in the DC brushless motor. Outdoor unit. 10. The rotation direction and the number of rotations of the DC brushless motor are determined by detecting a position by an induced voltage generated in a stator winding when the DC brushless motor is rotated and a reference voltage generated from a driving DC power supply. The outdoor unit of the air conditioner according to claim 8, which is detected. 11. The DC brushless motor, wherein the outdoor unit includes a heat exchanger for a refrigeration cycle, and if the amount of air required for the heat exchanger is secured by outside air when the operation of the outdoor unit is started. When the operation of the outdoor unit is started without driving, and the amount of air required for the heat exchanger during operation is insufficient with outside air, the DC brushless motor is rotated in the detected rotation direction. The outdoor unit for an air conditioner according to claim 8. 12. The outdoor unit comprises a heat exchanger for a refrigeration cycle and a cooler for cooling electric parts, and when the operation of the outdoor unit is started, the air volume required for the heat exchanger is If secured and the temperature of the cooler is equal to or lower than a predetermined value, the operation of the outdoor unit is started without driving the DC brushless motor, and the air volume required for the heat exchanger during operation is outside air. The outdoor unit for an air conditioner according to claim 8, wherein the DC brushless motor is rotated in the detected rotation direction when the temperature is insufficient or when the temperature of the cooler exceeds a predetermined value. 13. When the rotation speed of the fan motor due to the outside air while the outdoor unit is stopped is equal to or higher than the command value of the rotation speed command signal determined by the control of the outdoor unit, the air volume required for the heat exchanger is the outside air. If the rotation speed of the fan motor becomes smaller than the command value of the rotation speed command signal during operation, the amount of air required for the heat exchanger is insufficient for outside air. The outdoor unit of the air conditioner according to claim 11 or 12. 14. The outdoor unit has an air suction port for sucking outside air into the outdoor unit outer shell, and an air blowing port for blowing out the outside air passing through the outdoor unit to the outside. Drives the blower so that the outside air is sucked into the inside from the air suction port and blows out from the air outlet, and the rotation speed of the DC brushless motor during operation is the rotation speed required by the outdoor unit. The outdoor unit of the air conditioner according to claim 8, wherein, in the following cases, if the detected rotation direction is forward rotation, the DC brushless motor is forwardly rotated. 15. The outdoor unit has an air suction port for sucking outside air into the outdoor unit outer shell and an air blowing port for blowing out the outside air passing through the outdoor unit to the outside, and when the DC brushless motor is rotated in a reverse direction. Drive the blower so that the outside air is sucked in from the air outlet and blown out from the air inlet, and the rotation speed of the DC brushless motor during operation is the rotation speed required by the outdoor unit. The outdoor unit of the air conditioner according to claim 8, wherein, in the following cases, if the detected rotation direction is reverse rotation, the DC brushless motor is reversely rotated. 16. An outdoor unit of an air conditioner equipped with a blower using a DC brushless motor as a drive motor, wherein the rotation direction of the DC brushless motor due to outside wind is detected while the outdoor unit is stopped, An outdoor unit for an air conditioner, wherein the DC brushless motor is rotated in the detected rotation direction when the machine starts to operate. 17. The outdoor unit for an air conditioner according to claim 16, wherein the rotation direction of the DC brushless motor is detected by a signal from a position detecting element of a rotor provided in the DC brushless motor. . 18. The direction of rotation of the DC brushless motor is detected by performing position detection based on an induced voltage generated in a stator winding when the DC brushless motor is rotated and a reference voltage generated from a driving DC power supply. The outdoor unit for an air conditioner according to claim 16.