JP2989490B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an air conditioner having a motor and a compressor driven by the motor.

[0002]

2. Description of the Related Art Conventionally, a four-way valve includes a pair of heat exchangers arranged inside and outside of a room and performing heat exchange with a refrigerant, a compressor for compressing the refrigerant, a four-way valve for switching the flow direction of the refrigerant, a capillary tube, and the like. 2. Description of the Related Art There is known an air conditioner capable of performing air conditioning in various operation modes such as heating, cooling, and dehumidification by switching of the air conditioner.

[0003] Most compressors provided in home air conditioners and the like are configured to obtain a driving force for compression from a motor. By the way, at the time of starting and operating the motor, vibration and noise are generated from the motor. Therefore, the motor and the compressor that obtains the driving force by the motor are generally arranged on the outdoor unit side.

[0004]

However, according to the above-described structure, the compressor and the motor installed in the outdoor unit are placed in a temperature environment close to the outdoor temperature, especially in winter and the like. You will be in a low temperature environment. In a low-temperature environment, the electric resistance value of the drive coil of the motor increases, and the viscosity of lubricating oil for lubricating the movable part in the compressor increases. For this reason, in an air conditioner that supplies a constant voltage at the time of starting the motor regardless of the ambient temperature of the compressor, the current flowing through the drive coil decreases when the ambient temperature of the compressor is low, and further, the viscosity of the lubricating oil decreases. There is a possibility that the motor cannot be started due to an increase in torque required for starting the motor due to an increase in resistance. This tendency is particularly noticeable in the case where the starting voltage is set low in order to reduce the inrush current at the time of starting.

In order to solve this problem, there is also an air conditioner in which, when the start of the motor fails, the voltage supplied to the motor is slightly increased to repeatedly try to start the motor again. However, since the motor is repeatedly started at a low temperature, electric power is wasted at the time of starting the motor, and there is a problem that it takes time until the motor actually starts.

In view of the above facts, an object of the present invention is to provide an air conditioner that can start a motor smoothly without wasting power even when the ambient temperature is low.

[0007]

According to a first aspect of the present invention, there is provided an air conditioner, comprising: a motor, a compressor driven by the motor, and a temperature in the vicinity of a location where the compressor is provided. Temperature detecting means for detecting, and when the temperature detected by the temperature detecting means is equal to or lower than a predetermined temperature, the voltage supplied to the motor at the time of starting the motor is set to be higher than when the detected temperature is higher than the predetermined temperature. And control means for increasing the height.

According to a second aspect of the present invention, in the air conditioner of the first aspect, when the temperature detected by the temperature detecting means is equal to or lower than a predetermined temperature, the control means detects the temperature. As the temperature decreases, the voltage supplied to the motor at the time of starting the motor is increased.

[0009]

In the air conditioner of the present invention, the temperature detecting means detects the temperature near the portion where the compressor is provided. When the detected temperature is equal to or lower than the predetermined temperature, the control unit sets the voltage supplied to the motor at the time of starting the motor higher than the starting voltage when the detected temperature is higher than the predetermined temperature. Generally, when the temperature in the vicinity of the compressor is low, the electric resistance of the drive coil of the motor that drives the compressor increases, so that the current flowing through the drive coil decreases and the viscosity of the lubricating oil in the compressor increases. Therefore, the torque required to start the motor increases, but by increasing the voltage supplied to the motor at the time of starting the motor as described above, a decrease in the driving torque of the motor can be avoided. Failure to start can be avoided. Therefore, since it is not necessary to repeatedly start the motor, even when the ambient temperature is low, the motor can be started smoothly without wasting power.

Further, when the detected temperature is higher than the predetermined temperature, the control means makes the starting voltage supplied to the motor lower than the starting voltage when the detected temperature is lower than the predetermined temperature. Therefore, power consumption can be reduced and the inrush current at the time of starting can be reduced as compared with the case where the starting voltage is set to a constant high value regardless of the detection voltage.

A motor having a large output such as a motor for driving a compressor provided in a large-sized air conditioner requires a large torque at the time of starting the motor even in a normal state, and a high voltage needs to be supplied. is there. Therefore, since the influence of the decrease in the drive current of the motor and the increase in the torque required for starting due to the temperature decrease in the vicinity of the compressor arrangement portion is great, when the present invention is applied to a motor having a large output, The effect of the invention is remarkably exhibited.

In general, as the temperature in the vicinity of the compressor location decreases, the resistance value of the drive coil of the motor increases, and the viscosity of the lubricating oil in the compressor increases. Therefore, the supply voltage required for starting the motor increases as the temperature near the portion where the compressor is disposed decreases.

Accordingly, when the temperature detected by the temperature detecting means is equal to or lower than the predetermined temperature, the control means supplies the motor to the motor at the start of the motor as the detected temperature decreases. It is preferable to increase the voltage, more specifically, to gradually increase the voltage as the detection temperature decreases, or to increase the voltage continuously.

The first aspect of the present invention includes changing the voltage supplied to the motor in two steps with a predetermined temperature as a boundary. In this case, even in a very low temperature environment, the motor can be started successfully. The voltage at a temperature slightly lower than the predetermined temperature is equal to the voltage at a considerably lower temperature,
That is, it is necessary to set the voltage high enough to start the motor in a considerably low temperature environment. On the other hand, when the voltage supplied to the motor is increased as the detected temperature decreases as described above, the voltage at a temperature slightly lower than the predetermined temperature is smaller than the voltage at the predetermined temperature because the temperature difference from the predetermined temperature is small. Is small, but even at this voltage, the motor can be reliably started. From the above, the voltage to be supplied to the motor can be lower over a wide temperature range when the voltage is changed as the detected temperature is lower than when the voltage is changed in two stages. Power consumption for starting the motor can be further reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, the air conditioner (air conditioner) of this embodiment has an indoor unit 10 and an outdoor unit 12.
And the indoor unit 10 and the outdoor unit 1
2 is provided with a refrigerant circulation path for circulating the refrigerant.

The indoor unit 10 includes an indoor heat exchanger 16
Is provided. In the vicinity of the indoor heat exchanger 16,
A fan 17 driven by a fan motor 70E, which will be described later, for blowing air by passing through the indoor heat exchanger 16 is provided.

The indoor heat exchanger 16 is connected to a valve 20 of the outdoor unit 12 via a refrigerant pipe 18 composed of a thick pipe. Further, the valve 20 is connected to the four-way valve 36 via the muffler 22. The four-way valve 36 is connected to the outdoor heat exchanger 28 via the accumulator 24, the compressor 26, the muffler 38, and the four-way valve 36.

The outdoor heat exchanger 28 is connected to a valve 32 via a capillary tube 30 and a strainer 42, and is connected to a muffler 38 and a four-way valve 3 via an electromagnetic valve 40.
6 is connected. The valve 32 is connected to the indoor heat exchanger 16 via a refrigerant pipe 34 formed of a thin tube.
, A closed refrigerant circuit, that is, a refrigeration cycle is formed. In the vicinity of the outdoor heat exchanger 28, a fan 29 driven by a fan motor 112A, which will be described later, for passing air through the outdoor heat exchanger 28 is provided.

FIG. 2 shows an electric circuit of the indoor unit 10. The electric circuit includes a power supply board 70 and a control board 72. The power supply board 70 includes a drive circuit 70A to which a fan motor 70E (DC brushless motor) for adjusting the amount of air blown into the room is connected, a motor power supply circuit 70B for generating electric power for driving the motor, and electric power for a control circuit. A control circuit power supply circuit 70C that generates
And a serial circuit power supply circuit 70D for generating power for the serial circuit.

Therefore, by changing the voltage of the DC power supplied from the motor power supply circuit 70B to the drive circuit 70A, it is possible to arbitrarily adjust the rotation speed of the fan motor 70E, that is, the amount of air blown by the blower from the microcomputer. In the present embodiment, for example, this voltage is 25
Control is performed in six stages.

The control board 72 is provided with a serial circuit 72A connected to a serial circuit power supply circuit 70D, a drive circuit 72B for driving a motor, and a microcomputer 72C as a control circuit. The drive circuit 72B includes a step motor 74A for up and down flaps that moves the flap up and down, step motors 74B and 74C for left and right flaps, and a step motor 74D for changing the direction of a floor sensor that detects the temperature of the floor surface. Is connected. The rotation angles of these step motors are controlled by signals from the microcomputer 72C.

The microcomputer 72C is connected to a CP (not shown).
U, RAM, ROM, an input / output control unit, and the like. The microcomputer 72C has a display LED provided on the display substrate 76 for displaying an operation mode and the like, and a reception for receiving an operation signal from a remote controller. The circuit is connected, and a floor sensor and an optical sensor provided on the sensor board 78 for detecting the temperature of the floor surface are connected.
Further, a microcomputer 72C is connected to a room temperature sensor 80A for detecting a room temperature and a heat exchanger temperature sensor 80B for detecting the temperature of the indoor heat exchanger 16, and a self-diagnosis LED provided on a switch board 82. An operation changeover switch for switching between the operation and the test operation and a self-diagnosis switch are connected.

FIG. 3 shows an electric circuit of the outdoor unit 12, which includes a rectifier circuit 100 and a control board 102. The electric circuit of the outdoor unit 12 is connected to the electric circuit of the indoor unit 10 in FIG. 2 through a plurality of terminals indicated by.

The control board 102 generates power for switching the serial circuit 102A connected to the serial circuit power supply circuit 70D of the indoor unit 10, the noise filters 102B, 102C, 120D for removing noise, and the inverter 104. A switching power supply circuit 102E and a microcomputer 102F as a control circuit are provided. The microcomputer 102F includes a C (not shown)
The microcomputer 7 includes a PU, a RAM, a ROM, an input / output control unit, and the like.
It controls the frequency (18 Hz to 150 Hz) of AC power supplied to the compressor and the operation of each device based on a control signal transmitted from 2C.

An inverter 104 is connected to the switching power supply circuit 102E, and a compressor motor 106 for supplying a driving force to the compressor 26 for compressing the refrigerant is connected to the inverter 104.

The microcomputer 102F includes an outside air temperature thermistor 110 serving as an outside air temperature sensor for detecting the outside air temperature.
A, a coil temperature thermistor 110B as a coil temperature sensor for detecting the temperature of the outdoor heat exchanger 28, and a compressor temperature thermistor 110C as a temperature sensor for detecting the temperature of the compressor are connected. Further, a four-way valve 36 and a solenoid valve 40 are connected to the outdoor unit 100. Note that 112A is a fan motor, and 112B is a fan motor capacitor.

According to this air conditioner, the four-way valve 36 is switched with the electromagnetic valve 40 turned off, and the refrigerant is supplied to the indoor heat exchanger 16, the refrigerant pipe 18, the valve 20, the muffler 22, the four-way valve 36, the accumulator 24, and the compressor. 26, the muffler 38, the four-way valve 36, the outdoor heat exchanger 28, the capillary tube 30, the strainer 42, the valve 32, the refrigerant pipe 34, and the indoor heat exchanger 16 are circulated in this order. Since the refrigerant evaporates and the refrigerant is condensed in the outdoor heat exchanger 28, indoor cooling can be performed. Conversely, when the refrigerant is circulated, the refrigerant condenses in the indoor heat exchanger 16 and the refrigerant evaporates in the outdoor heat exchanger 28, so that the room can be heated.

Further, the solenoid valve 40 is turned on during the heating operation so that a part of the high-temperature refrigerant discharged from the compressor 26 flows into the outdoor heat exchanger 28, so that the temperature of the outdoor heat exchanger 28 To prevent frost formation.

As shown in FIG. 4, the compressor 26 according to the present embodiment is housed in a casing 120 integrally with a compressor motor 106 for driving the compressor 26. The compressor 26 is provided at a lower portion in the casing 120, and the compressor motor 106 is provided at the lower part of the casing 12.
Each of them is disposed substantially at the center in the area 0.

The compressor motor 106 includes a rotating shaft 130 for transmitting a driving torque to the compressor 26,
It is configured to include a rotor 132 that rotates integrally with the rotation shaft 130, a stator 128, and a coil 126 wound around the stator 128. The substantially cylindrical rotor 132 is disposed at the center of the casing 120 such that the central axis of rotation thereof is along the vertical direction. The rotating shaft 130 is fixed to the center of the rotor 132 so that the center axes of the rotor 132 and the vertical direction of the rotor 132 coincide with each other, and extends to a lower portion of a casing 120 in which the compressor 26 described later is disposed. I have. The stator 128 disposed so as to cover the rotor 132 from the surroundings is fixed so that the outer side is fixed to the inner wall of the casing 120 and a slight gap is formed between the inner side surface and the side surface of the stator 128. It is arranged.

As shown in FIG. 6, the compressor motor 106 has three-phase coils 126A, 126B,
Reference numeral 126C denotes a brushless DC motor connected in a star shape, and a drive torque is applied to the rotor 132 and the rotating shaft 130 by sequentially supplying a voltage between two of the three contacts A, B, and C. It has a structure to supply. That is, a voltage is first supplied between the contacts A and B, a voltage is supplied between the contacts B and C after a predetermined time, and a voltage is supplied between the contacts C and A after a predetermined time. By switching the sequentially supplied coils, a driving torque is supplied to the rotor 132 and the rotating shaft 130.

Since the above-described voltage supply to the coil needs to match the timing with the rotational position of the rotating rotor 132, it is necessary to detect the rotational position of the rotor 132. Generally, the position of a rotor in a brushless DC motor is often detected by a Hall element formed of an n-type semiconductor using InSb (indium antimony). However, since this Hall element is weak to heat and may malfunction at a high temperature, a voltage induced by electromagnetic induction is applied to another coil other than the coil between the two supplied contacts in this embodiment. The rotation position of the rotor 132 that rotates based on the detected voltage value is detected.

The compressor 26 has two cylinders 1 for forming a compression chamber described later for compressing the refrigerant.
42 and 150 are provided. A bearing 136 is provided between the cylinder 142 and the rotor 132, and the rotating shaft 130 is inserted through the bearing 136. A bearing 152 is provided between the cylinder 150 and the bottom surface of the casing 120, and the above-described rotary shaft 130 is also inserted into the bearing 152. A partition plate 144 is disposed between the two cylinders 142 and 150. The cylinder 142 is sandwiched between the partition plate 144 and the bearing 136 from above and below, whereby a compression chamber is formed in the cylinder 142.

As shown in FIG. 5, the cylindrical cylinder 14
As described above, the rotary shaft 130 is inserted into the center of the rotary shaft 2, the eccentric portion 138 is eccentrically fixed to the rotary shaft 130, and the roller 140 is fixed outside the eccentric portion 138. The outer peripheral surface of the roller 140 is
2 is in contact with the inner peripheral surface. The space between the outer peripheral surface of the roller 140 and the inner peripheral surface of the cylinder 142 serves as a compression chamber 170 for compressing the refrigerant. The cylinder 142 has an inlet 17 for sucking refrigerant into the compression chamber 170.
4 and a discharge port 1 for discharging the refrigerant from the compression chamber 170
78 and a discharge valve 180 for adjusting the discharge amount of the refrigerant. A blade 172 fixed to a spring (not shown) provided in the groove 176 is in pressure contact with the roller 140 by the pressure of the spring. Thereby, the compression chamber 170 has two rooms, that is, a right room in which the refrigerant sucked in FIG. 5 is compressed by the roller 140 and a left room serving as a passage to the discharge port 178 of the compressed refrigerant.
Is divided into

The cylinder 150 is also sandwiched between the partition plate 144 and the bearing 152 from above and below, whereby a compression chamber is formed in the cylinder 150. This cylinder 1
50, a disk-shaped eccentric portion 148 eccentrically fixed to the axis of the rotating shaft 130 and an eccentric portion 14
8 and a donut-shaped roller 146 fixed to the outer peripheral portion. The eccentric portion 138 and the eccentric portion 1
Reference numeral 48 is fixed at a position symmetrical with respect to the rotation shaft 130 so that the rotation with the rotation of the rotation shaft 130 is performed with a phase difference of 180 degrees.

Further, suction pipes 154 and 156 for sucking the refrigerant into the compression chamber are provided with cylinders 142 and 156, respectively.
50. A substantially funnel-shaped discharge muffler 158 that receives refrigerant discharged from a discharge port 178 (see FIG. 5) provided in the cylinder 142, which will be described later, is disposed so as to cover the lower part of the bearing 136 from above. A substantially dish-shaped discharge muffler 160 that receives the refrigerant discharged from a discharge port (not shown) provided in the cylinder 150 is disposed below the bearing 152. A bypass pipe 134 used as a refrigerant passage from the lower portion to the center of the casing 120 is provided outside the casing 120, and ports at both ends of the pipe penetrate through the side wall of the casing 120. Also, the refrigerant discharge pipe 122 is
20 is disposed at the center of the upper surface. The discharge muffler 158 and the discharge muffler 160 are connected to a bypass pipe 134 via a pipe (not shown), and the bypass pipe 134 is also connected to a discharge pipe 122 via a pipe (not shown).
Has been contacted.

Further, on the upper surface of the casing 120, there is provided a power supply for supplying electric power to the compressor motor 106.
There are two terminals 124A, 124B, 124C and the compressor temperature thermistor 110C already described.

The operation of this embodiment will be described below. When a signal instructing the start of operation of the air conditioner is received from the remote controller, a control routine shown in FIG. 7 is executed.
This control routine is executed by the microcomputer 10 of the outdoor unit 12.
Executed in 2F.

The uptake temperature T of the compressor disposed position of proximity detected by the compressor temperature thermistor 110C at step 200, the temperature T at the next step 202 determines whether the predetermined temperature T ₁ of less.

If the temperature T is higher than the predetermined temperature T ₁ , the routine proceeds to step 206, where the normal voltage V ₁ is set as the starting voltage of the compressor motor 106, and the routine proceeds to step 208. On the other hand, if the temperature T is equal to or less than the predetermined temperature T ₁ of the
Proceeding to step 204, the temperature corresponding to the temperature T is obtained from a correspondence graph (graph indicated by a solid line in FIG. 8) between the temperature in the vicinity of the compressor and the starting voltage of the compressor motor stored in a ROM (not shown) incorporated in the microcomputer 72C. The starting voltage V ₂ of the compressor motor to be read is read, and the voltage V ₂ is set as the starting voltage of the compressor motor 106. The voltage V ₂ of the above is set to a value higher than the normal voltage V _1.

In step 208, the compressor motor 1
The starting voltage set in the above step 204 or step 206 is supplied to the coil 126 of No. 06 to start. Thereby, the rotating shaft 130 of the compressor motor 106 rotates in the R direction in FIG. 5, and accordingly, the roller 140 slides on the inner peripheral surface of the cylinder 142 while rotating in the R direction.
Eccentric rotation in the direction.

At this time, the refrigerant is supplied to the suction pipe 15 shown in FIG.
4, 156 enter the compressor 26. The refrigerant sucked from the suction pipe 154 is supplied to the suction port 17 in FIG.
4 enters the compression chamber 170, and is compressed by the outer peripheral surface of the roller 140 and the inner peripheral surface of the cylinder 142 by the eccentric rotation of the roller 140. After being compressed, the refrigerant
, And is discharged out of the compression chamber from the discharge port 178 whose opening amount has been adjusted by the discharge valve 180.
The discharged refrigerant passes through the discharge muffler 158, and then is discharged from the discharge pipe 122 to the outside of the casing 120 through a pipe (not shown) and a bypass pipe 134.
The refrigerant sucked from the suction pipe 154 is also compressed in a compression chamber (not shown) in the cylinder 150 in the same manner as described above, and then discharged from the discharge pipe 122 to the outside of the casing 120 through a similar route.

Then, in the next step 210, the air conditioning operation is performed at a rotation speed according to the instruction from the microcomputer 72C provided in the indoor unit 10. More specifically, the microcomputer 72C performs a fuzzy calculation based on the difference between the target temperature and the room temperature and the amount of change in the difference, calculates a variation in the operating capacity (frequency) of the compressor 26, and calculates the operating capacity. Of the variation of the outdoor unit 12 by the microcomputer 102
F is transmitted via an interface circuit and a signal line. Further, the microcomputer 102F of the outdoor unit 12 supplies the compressor 26 with AC power of a new frequency obtained by adding the frequency of the increase / decrease to the frequency of the AC power currently being supplied to the compressor 26.

As described above, by increasing or decreasing the frequency of the AC power supplied to the compressor 26 from the target temperature and the room temperature, the operating capacity (frequency of the AC power) of the compressor 26 required to maintain the target temperature is obtained. With this operation capacity, the operation of the compressor 26 is maintained. When the target temperature is changed in such a state, the microcomputer 72C newly calculates a change in the operating capacity of the compressor 26, and determines the operating capacity (frequency) required to maintain the target temperature (air conditioning load). Is set.

[0046] As apparent from the above description, when the temperature of the compressor disposed position of the neighborhood is less than a predetermined temperature is set high voltage V ₂ as starting voltage of the motor than normal voltages V ₁ Therefore, failure of starting the motor can be avoided, and the motor can be started smoothly without wasting power.

The voltage set as the starting voltage of the motor when the temperature in the vicinity of the compressor location is equal to or lower than the predetermined temperature changes stepwise with the temperature change as shown by the solid line in FIG. The value is not limited to the set value, and may be a value that is continuously changed with the temperature change as shown in FIG. 9 or the predetermined temperature is set as a boundary as shown by a broken line in FIG. The voltage may be changed in two stages so that the voltage value becomes higher at a predetermined temperature or lower. In the above various methods, when the voltage is changed in two steps as shown by the broken line in FIG. 8, there is an advantage that the control is simple. At the same when the stepwise change with temperature change voltage as indicated by the solid line in FIG. 8 by comparison, the supply voltage V ₂ when the motor starts at a given temperature T ₁ of the following temperature T, in FIG. 8 becomes lower than the voltage V ₃ in the case of changing the voltage in two steps as shown in dashed lines,
The power can be saved by the voltage value (V ₃ −V ₂ ), that is, the power consumption for starting the motor can be further reduced.

Although the present embodiment has been described with reference to a compressor having a plurality of compression chambers, the present invention can be applied to a compressor having one compression chamber.

In this embodiment, an example is shown in which a three-phase brushless DC motor is used as the motor for driving the compressor. However, the present invention can be applied to a case where another DC motor or AC motor is used. .

Further, as shown in the present embodiment, a temperature sensor for a compressor which is existing in an air conditioner can be used as the temperature detecting means. This has the effect that the configuration is simpler than when a dedicated temperature sensor is newly provided near the compressor. Further, in the present embodiment, an example is shown in which the temperature sensor is disposed on the upper surface of the casing 120 that houses the compressor 26, but the position at which the temperature sensor is disposed is not limited to this.

[0051]

According to the first aspect of the present invention, when the temperature detected by the temperature detecting means for detecting the temperature near the portion where the compressor is installed is equal to or lower than the predetermined temperature, the voltage supplied to the motor when the motor is started. Control means for raising the detected temperature higher than the case where the detected temperature is higher than the predetermined temperature, when the temperature in the vicinity of the compressor arrangement portion is low, it is possible to avoid a decrease in the driving torque of the motor,
Failure to start the motor can be avoided. Therefore,
Since there is no need to repeatedly try starting the motor,
Even when the ambient temperature is low, there is an excellent effect that the motor can be started smoothly without wasting power.

According to the second aspect of the present invention, when the temperature detected by the temperature detecting means is equal to or lower than the predetermined temperature, the control means controls the motor when starting the motor as the detected temperature decreases. Since the voltage to be supplied is increased, the voltage to be supplied at the time of starting the motor can be lowered over a wide temperature range as compared with a case where the voltage is changed in two steps with a predetermined temperature as a boundary. Has an excellent effect that power consumption can be further reduced.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of an indoor unit of the air conditioner.

FIG. 3 is an electric circuit diagram of an outdoor unit of the air conditioner.

FIG. 4 is a schematic configuration diagram showing a compressor and a compressor motor.

FIG. 5 is a schematic configuration diagram around a compression chamber of a compressor.

FIG. 6 is a schematic diagram showing coil connection of a compressor motor.

FIG. 7 is a flowchart showing a control routine.

FIG. 8 is a diagram showing the correspondence between the temperature near the compressor installation site and the starting voltage of the motor, which are referred to in the control of this embodiment.

FIG. 9 is a diagram showing a correspondence between a temperature in the vicinity of a compressor installation site to which the present invention can be applied and a motor starting voltage.

[Explanation of symbols]

Reference Signs List 10 indoor unit 12 outdoor unit 26 compressor 72C microcomputer 102F microcomputer 106 compressor motor (motor) 110C compressor temperature thermistor (temperature detecting means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04B 49/02 F25B 1/00

Claims (2)

(57) [Claims] 1. A motor, a compressor driven by the motor, temperature detecting means for detecting a temperature in the vicinity of a location where the compressor is provided, and Control means for increasing the voltage supplied to the motor when the motor is started, higher than when the detected temperature is higher than the predetermined temperature. 2. When the temperature detected by the temperature detection unit is equal to or lower than a predetermined temperature, the control unit increases the voltage supplied to the motor when the motor is started as the detected temperature decreases. The air conditioner according to claim 1, wherein: