JP2011067079A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner which operates with high efficiency and high capacity without causing intermittent operations by using a permanent magnet motor whose magnetic flux is variable in several stages. <P>SOLUTION: The air conditioner 100 comprises: a sealed compressor 1 having the permanent magnet motor 16 whose magnetic flux is variable, an indoor heat exchanger 3, an expanding device 4, an outdoor heat exchanger 5, a room temperature detector 7, an outside air temperature detector 8, and a controller 9. When the controller 9 determines that the air conditioning load is high during the operation of the air conditioner 100, the magnetic flux of the permanent magnet motor 16 is reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner using a hermetic compressor having a permanent magnet motor capable of changing the amount of magnetic flux.

  As an air conditioner, one using a permanent magnet motor for a hermetic compressor is known. The permanent magnet motor includes a stator having windings and a rotor having permanent magnets. The rotor has an insertion hole for a rotating shaft at the center of a core formed by laminating a large number of circular steel plates, and has a plurality of linear magnet accommodation holes at positions surrounding the insertion hole. These magnet accommodation holes have a depth shape penetrating the core along the axial direction of the rotation shaft, and each accommodates a permanent magnet. Due to the interaction between the magnetic field of these permanent magnets and the magnetic field generated by the stator winding, a rotational force is generated in the rotor.

  As an example of such a permanent magnet motor, a rotor composed of a plurality of cores arranged along the axial direction of the rotation shaft is used, and a low-coercivity permanent magnet is accommodated in one core of the rotor, while the other In which a high coercivity permanent magnet is housed and an excitation current for magnetization or demagnetization is applied to each phase winding of the stator to change the magnetic force of the low coercivity permanent magnet ( For example, Patent Document 1).

JP-A-2005-304204

  The air conditioner using the permanent magnet motor described above has the following problems. That is, in the above-described permanent magnet motor, the magnetic force of the low-coercivity permanent magnet can be changed by supplying an excitation current for magnetization or demagnetization to each phase winding.

  When such a permanent magnet motor is stopped, the amount of magnetic flux can be varied in several stages, for example, two stages. For this reason, the air conditioner stops the hermetic compressor once according to the air conditioning load, changes the amount of magnetic flux of the permanent magnet motor, and changes the amount of magnetic flux to the optimum amount of magnetic flux, with an efficient frequency, The hermetic compressor can be driven.

  However, when the hermetic compressor is stopped in order to change the amount of magnetic flux, there are problems such as deterioration in comfort and loss of power due to room temperature fluctuations due to intermittent operation. There is also a problem that it takes time to start up the heating.

  Accordingly, an object of the present invention is to provide an air conditioner capable of high-efficiency operation using a permanent magnet motor that can change the amount of magnetic flux in several stages.

  In order to solve the problems and achieve the object, the air conditioner of the present invention is configured as follows.

  As one aspect of the present invention, in an air conditioner including a hermetic compressor having a permanent magnet motor capable of changing the amount of magnetic flux in at least two stages, a prediction means for predicting an air conditioning load before the operation of the hermetic compressor And a control unit that operates the hermetic compressor and varies the amount of magnetic flux based on the air conditioning load predicted by the prediction unit, and the control unit receives the air conditioning load by the prediction unit. Provided is an air conditioner characterized in that when it is predicted to be large, the amount of magnetic flux of the permanent magnet motor is set to be small and the hermetic compressor is operated.

  According to the present invention, it is possible to provide an air conditioner capable of high-efficiency and high-performance operation using a permanent magnet motor that can change the amount of magnetic flux in several stages. In addition, the air conditioner can predict the operation mode in advance and set the amount of magnetic flux to be an efficient frequency in the predicted operation mode, so that the start-up operation can be performed with high efficiency and high capacity. Become.

Explanatory drawing which shows typically the structure of the air conditioner which concerns on one embodiment of this invention. The perspective view which shows the structure of the 1st core and 2nd core of a permanent magnet electric motor used for the air conditioner. Explanatory drawing which shows an example of the relationship between the operating frequency and time of the hermetic compressor in the operation of the air conditioner. Explanatory drawing which shows an example of the relationship between the operating frequency and time of the hermetic compressor in the operation of the air conditioner. The flowchart which shows an example of the driving | operation of the air conditioner. The flowchart which shows an example of the prediction of the operation mode of the air conditioner. The flowchart which shows an example of the prediction of the operation mode of the air conditioner. The flowchart which shows an example of the prediction of the operation mode of the air conditioner. Explanatory drawing which shows the modification of the relationship between the operating frequency and time of the hermetic compressor in the operation of the air conditioner. The flowchart which shows the modification of the operation mode of the air conditioner.

Hereinafter, an indoor unit of an air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view showing in cross section the configuration of an air conditioner 100 according to an embodiment of the present invention and the configuration of a hermetic compressor 1 provided in the air conditioner 100, and FIG. The perspective view which shows the structure of the 1st core 23a of the permanent magnet motor 16 used for the compressor 1, and the 2nd core 23b, FIG. 3 is the driving | operation of the hermetic compressor 1 in the heating operation and defrosting operation of the air conditioner 100. FIG. 4 is an explanatory diagram showing an example of the relationship between the frequency and the elapsed time, FIG. 4 is an explanatory diagram showing an example of the relationship between the operating frequency of the hermetic compressor 1 and the elapsed time in the heating operation and the thermo-off operation of the air conditioner 100, 5 is a flowchart showing an example of the operation of the air conditioner 100, FIG. 6 is a flowchart showing an example of the prediction of the operation mode of the air conditioner 100, and FIG. 7 is an example of the prediction of the operation mode of the air conditioner 100. Figure 8 shows the same sky Respectively show a flow diagram illustrating an example of a prediction of the operating mode of the conditioner 100. In FIG. 1, F indicates the refrigerant flow during the heating operation, G indicates the refrigerant flow during the cooling operation, and S indicates the signal line.

  As shown in FIG. 1, the air conditioner 100 includes a hermetic compressor 1, a four-way valve 2, an indoor heat exchanger 3, an expansion device 4, an outdoor heat exchanger 5, and an accumulator 6. ing. In the air conditioner 100, the refrigerant discharged from the hermetic compressor 1 moves sequentially through the indoor heat exchanger 3, the expansion device 4, and the outdoor heat exchanger 5 via the four-way valve 2, or sequentially in the reverse direction. The four-way valve 2 and the accumulator 6 are formed so as to be movable to the hermetic compressor 1.

  In the air conditioner 100, the hermetic compressor 1 and the accumulator 6 are connected, and the hermetic compressor 1 and the accumulator 6 are connected to the four-way valve 2. In the air conditioner 100, the indoor heat exchanger 3, the expansion device 4, and the outdoor heat exchanger 5 are sequentially connected and connected to the four-way valve 2.

  The air conditioner 100 is formed so that the flow direction of the refrigerant discharged from the hermetic compressor 1 can be changed by switching the four-way valve 2 as indicated by solid and broken arrows F and G shown in FIG. ing. The air conditioner 100 includes a room temperature detector 7, an outside air temperature detector 8, and a control unit 9.

  The hermetic compressor 1 has a metal hermetic container 10. Two suction ports 11 a and 11 b are attached to the lower part of the sealed container 10, and one discharge pipe 12 is attached to the upper part. The four-way valve 2 is connected to the discharge pipe 12 via a high-pressure side pipe. The accumulator 6 connected to the four-way valve 2 is connected to the suction ports 11a and 11b via two suction pipes 13a and 13b.

  Inside the sealed container 10, a permanent magnet motor 16 and a compression mechanism unit 17 are accommodated separately in an upper and lower direction. The permanent magnet motor 16 is provided so as to be in contact with the inner peripheral surface of the hermetic container 10, and has a cylindrical stator 22 connected to the power supply unit 21, and a rotor provided rotatably inside the stator 22. 23. A rotating shaft 24 is inserted through the central portion of the rotor 23, and a lower portion of the rotating shaft 24 is coupled to the compression mechanism portion 17.

  The compression mechanism unit 17 includes two compression chambers 26a and 26b communicating with the suction ports 11a and 11b, respectively, and rollers 27a and 27b that rotate eccentrically in response to the rotation of the rotary shaft 24 in the compression chambers 26a and 26b. It has. The compression mechanism section 17 is formed so that the refrigerant in the compression chambers 26 a and 26 b is compressed by the eccentric rotation of the rollers 27 a and 27 b and can be discharged into the sealed container 10. The discharged refrigerant flows into one of the indoor heat exchanger 3 or the outdoor heat exchanger 5 through the four-way valve 2 connected to the discharge pipe 12.

  As shown in FIG. 2, the rotor 23 of the permanent magnet motor 16 has a first core 23a formed by stacking a large number of circular steel plates and a plurality of circular steel plates similar to the first core 23a. And a second core 23b. The first core 23 a and the second core 23 b are arranged along the axial direction of the rotating shaft 24.

  As shown in FIG. 2, the first core 23 a and the second core 23 b are formed so that the rotation shaft 24 can be inserted through the center. Further, the first core 23 a and the second core 23 b are linear magnets at positions of four sides of a substantially square surrounding the rotation shaft 24, and magnets that penetrate the first and second cores 23 a and 23 b along the rotation shaft 24. Each has a receiving hole.

  The plate-shaped, four-pole (= 4) first permanent magnets 28 having low coercive force are accommodated in the four magnet accommodation holes of the first core 23a. These first permanent magnets 28 have a width smaller than the width of the magnet accommodation hole in the four sides, and are accommodated and fixed in a state where the center position thereof corresponds to the center position of the magnet accommodation hole.

  The plate-shaped and high coercivity four-pole second permanent magnets 29 are respectively accommodated in the four magnet accommodation holes of the second core 23b. These second permanent magnets 29 have substantially the same width as the width of the magnet housing hole in the elongated direction. That is, the width of the first permanent magnet 28 is smaller than the width of the second permanent magnet 29.

  A plurality of magnetic pole teeth are formed on the inner peripheral surface of the stator 22, and three phase windings are concentratedly mounted on these magnetic pole teeth. The rotor 23 is rotated by the interaction between the magnetic field generated by these phase windings and the magnetic field generated by the permanent magnets 28 and 29.

  The phase winding is star-connected at a neutral point, and a driving device is connected to the non-connected end of the phase winding. This drive device includes a forward conversion unit that converts an AC voltage of a commercial AC power source into a DC voltage, a switching circuit connected to an output terminal of the forward conversion unit, a control unit that controls switching of the switching circuit, a switching circuit and a phase winding. A two-phase energization position detector connected to each energization line between the current line, a current sensor provided in two energization lines between the switching circuit and the phase winding, and a sensorless vector control unit connected to the current sensor Etc.

  In the permanent magnet motor 16 having such a configuration, each first permanent magnet 28 having a low coercive force housed in the first core 23a of the rotor 23 applies an excitation voltage to the phase winding to form the phase winding. By supplying the exciting current, the magnetic force can be changed by magnetization or demagnetization.

  At this time, each of the second permanent magnets 29 having a high coercive force housed in the second core 23b of the rotor 23 has a high coercive force, so that the magnetic force changes even when an excitation current is supplied to the phase winding. There is no. That is, the first core 23a is variable in magnetic flux amount, and the second core 23b is non-variable in magnetic flux amount.

  For example, the variable width of the amount of magnetic flux is formed to be variable in several stages, for example, two stages. The details of other configurations of the permanent magnet motor 16 are omitted. Further, such a change in the amount of magnetic flux is performed according to an instruction from the control unit 9 when the drive of the permanent magnet motor 16 is stopped.

  Hereinafter, the amount of magnetic flux that is variable in two stages is indicated by the magnitude. When the variable magnetic flux amount is large, the efficiency is high on the low rotation side of the permanent magnet motor 16. When the amount of magnetic flux is large, the increase rate of the back electromotive force of the permanent magnet motor 16 with respect to the increase rate of the rotation speed is high, so that the rotation speed cannot be increased within a predetermined drive voltage range.

  Further, when the variable magnetic flux amount is small, the increase rate of the back electromotive force of the permanent magnet motor 16 with respect to the increase rate of the rotation speed is low, and therefore the rotation speed can be increased in a predetermined drive voltage range. However, when the amount of magnetic flux is small, the efficiency is low on the low rotational speed side. For this reason, when the hermetic load is large and the hermetic compressor 1 is operated at a high frequency (high rotation speed), the magnetic flux amount is small, the air conditioning load is small, and the hermetic compression is performed at a low frequency (low rotation speed). When the machine 1 is operated, it is often operated with an increased amount of magnetic flux, and by operating the hermetic compressor 1 with such an amount of magnetic flux, an efficient operation is possible.

  The room temperature detector 7 is formed so as to be able to detect the temperature in the room. The room temperature detector 7 is connected to the control unit 9 via a signal line S, for example. The room temperature detector 7 is configured to be able to transmit the detected room temperature information to the control unit 9.

  The outside air temperature detector 8 is formed to be able to detect outside air, for example, the outside air temperature around the outdoor heat exchanger 5. The outside air temperature detector 8 is connected to the control unit 9 via a signal line S, for example. The outside air temperature detector 8 is configured to be able to transmit information on the outside air temperature detected to the control unit 9.

  The control unit 9 is connected to the four-way valve 2, the expansion device 4, the room temperature detector 7, the outside air temperature detector 8, and the power supply unit 21 via the signal line S, for example. The control unit 9 is connected to other components via the signal line S, but detailed description thereof is omitted here.

  Moreover, the control part 9 is formed so that the air conditioner 100 can be operated in each operation mode based on an instruction from the remote control panel of the air conditioner 100. Specifically, the control unit 9 is configured to be able to operate the air conditioner 100 in a heating operation mode, a cooling operation mode, and a dehumidifying operation mode. When the air conditioner 100 is operated in the heating operation mode, the air conditioning load is large at the start of the heating operation, and the hermetic compressor 1 is operated at a high frequency. In addition, the control unit 9 includes a storage unit 31 that stores at least the past operation mode and each setting of the air conditioner 100 including the operation mode when the hermetic compressor 1 was previously stopped.

  The control unit 9 has a function of performing defrosting operation control, thermo-off operation control, and preheating operation control as operation control of each operation mode during or before operation of the air conditioner 100 in each operation mode. Have.

  The function of performing the defrosting operation control detects the temperature of the outdoor heat exchanger 5, and when the detected temperature of the outdoor heat exchanger 5 becomes a predetermined temperature or less, frost adheres to the outdoor heat exchanger 5. This is a function to stop the air blowing to the outdoor heat exchanger 5 and switch the four-way valve 2 to defrost frost adhering to the outdoor heat exchanger 5. Note that the defrosting operation is performed as a predetermined time, for example, until the time when it is assumed that the defrosting of the outdoor heat exchanger 5 set in advance is completed or the temperature of the outdoor heat exchanger 5 becomes equal to or higher than the predetermined temperature. Done.

  The defrosting operation will be described with reference to FIG. In addition, the vertical axis | shaft of FIG. 3 shows the operating frequency of the hermetic compressor 1, and a horizontal axis shows elapsed time, respectively. As shown in FIG. 3, first, when the temperature of the outdoor heat exchanger 5 becomes equal to or lower than a predetermined temperature due to the heating operation of the air conditioner 100, the heating operation is temporarily stopped, and the defrosting operation is performed. Do. The control unit 9 performs the heating operation again with the air conditioner 1 when the defrosting operation elapses for a predetermined time or the temperature of the outdoor heat exchanger 5 becomes equal to or higher than the predetermined temperature. In this way, the defrosting operation is repeatedly performed alternately with the heating operation.

  In this way, the function of performing the defrosting operation control is performed by the air conditioner 100 so that the defrosting operation of the outdoor heat exchanger 5 is performed for a predetermined time or the temperature of the outdoor heat exchanger 5 during the heating operation. This is a function performed based on this. In general, the room temperature increases to some extent before the first defrosting operation, and a large heating capacity is often not required after the first defrosting operation.

  For example, when the room temperature Tc is adjusted to a temperature higher than the target set temperature Td, the function of performing the thermo-off operation control temporarily stops the operation of the hermetic compressor 1 and stops the operation of the hermetic compressor 1. This is a function for resuming operation when the room temperature Tc sometimes becomes equal to or lower than the target set temperature Td. Even if the hermetic compressor 1 is driven by the permanent magnet electric motor 16, it is only required that the function of the compression mechanism unit 17 can be stopped. That is, it is only necessary that the air conditioning function of the air conditioner 100 is stopped.

  The thermo-off operation will be described with reference to FIG. In addition, the vertical axis | shaft of FIG. 4 shows the operating frequency of the hermetic compressor 1, and a horizontal axis shows elapsed time, respectively. As shown in FIG. 4, first, when the air conditioner 100 is in the heating operation, when the room temperature Tc is higher than the target set temperature Td, the heating operation is performed in order to avoid useless heating operation. Stop (thermo-off).

  Thereafter, when the room temperature Tc becomes equal to or lower than the target set temperature Td, the heating operation is restarted (thermo-on). As described above, the thermo-off operation control is a function of switching between the heating operation and stop according to the room temperature Tc. Note that a large heating capacity is not required after the first thermo-off.

  The function of performing the preheating operation control is a state in which electric power is supplied to the air conditioner 100 and the permanent magnet motor 16 or the like is previously used to improve the start-up of the heating operation during so-called standby when the operation is stopped. This function energizes each component and preheats it. Note that the details of the functions for performing each operation control are omitted.

  The control unit 9 has a function of changing the amount of magnetic flux. As a function of varying the amount of magnetic flux, the control unit 9 includes a predicting unit 32 that can predict the operation mode after activation of the air conditioner 100, and is variable to a magnetic flux amount suitable for the operation mode predicted by the predicting unit 32. It is made possible.

  Furthermore, the control unit 9 has a function of changing the amount of magnetic flux when the room temperature Tc reaches the target set temperature Td after a predetermined time has elapsed as the function of changing the amount of magnetic flux. ing. This is a case where the air conditioner 100 is operated in the heating operation mode, and when the room temperature Tc becomes the target set temperature Td, the air conditioner 100 is operated with the hermetic compressor 1 having a low capacity. It becomes. For this reason, the rotation speed of the permanent magnet motor 16 may be low.

  That is, especially in the heating operation, the air-conditioning load is large at the time of start-up, high-performance operation is required, and the hermetic compressor 1 needs to be operated at a high frequency. However, when the room temperature Tc reaches the target set temperature Td, the air conditioning load becomes small, and thus the hermetic compressor 1 is operated at a low frequency.

  Thus, the hermetic compressor 1 becomes a low frequency operation after a high frequency operation in the heating operation in the heating operation mode. For this reason, the control unit 9 is formed so that the amount of magnetic flux can be changed from small to large when the air conditioner 100 is operated in the heating operation mode and the room temperature Tc becomes the target set temperature Td. ing.

  Next, the prediction unit 32 will be described. The predicting means 32 is formed so as to be able to predict whether the air conditioning load of the air conditioner 1 is large, that is, whether the hermetic compressor 1 is operated in high frequency operation or low frequency operation. Here, since the operation of the hermetic compressor 1 at a high frequency is mainly used at the start of the heating operation, hereinafter, the case where the air conditioning load is large will be described as the heating operation.

  The prediction means 32 determines whether or not the next operation mode is the heating operation as a prediction of the air conditioning load, and in the case of the heating operation, a prediction function that determines that the hermetic compressor 1 is operated at a high frequency. have.

  Specifically, the prediction means 32 is based on the function of predicting the operation mode from the outside air temperature T0 (prediction function 1), the function of predicting the operation mode from the previous operation mode (prediction function 2), and the presence / absence of preheating control. One of the functions for predicting the operation mode (prediction function 3) is provided.

  The function of predicting the operation mode from the outside air temperature T0 that is the prediction function 1 is, for example, that the predicting means 32 compares the outside air temperature T0 detected by the outside air temperature detector 8 with a predetermined temperature T, and the outside air temperature T0. However, when the temperature is equal to or lower than the predetermined temperature T, this is a function for predicting high-frequency operation.

  Here, the predetermined temperature T is a set temperature stored in the storage unit 31 provided in the control unit 9 and is, for example, a set low outside air temperature (hereinafter referred to as “low outside air temperature T”). ”). The low outside air temperature T is, for example, the temperature displayed in the catalog of the air conditioner 100 as the low outside air heating capability, and is often set to about 2 ° C.

  The function of predicting from the previous operation mode, which is the prediction function 2, is based on the operation mode of the previous air conditioner 100 (when the previous hermetic compressor 1 is stopped) stored in the storage unit 31 of the control unit 9. Thus, the predicting means 32 is a function for predicting the operation mode when the air conditioner 100 (sealed compressor 1) is operated next time. For example, when the previous operation mode of the air conditioner 100 is the heating operation mode, it is predicted that the operation mode will be the heating operation mode next time. Note that not only the previous operation mode of the air conditioner 100 but also information on the outside air temperature may be further added for prediction.

  The function of predicting the operation mode based on the presence / absence of preheating control, which is the prediction function 3, is that the next heating operation mode is performed when the air conditioner 100 is preheated by the control unit 9, so that the predicting means 32 is used next time. This operation mode is determined to be the heating operation mode.

  When the heating operation (high frequency operation) described above is predicted, the control unit 9 reduces the amount of magnetic flux, and when another operation mode (low frequency operation) is predicted, the control unit 9 Increase the amount of magnetic flux.

  Next, an example of the operation of the air conditioner 100 having the hermetic compressor 1 using the permanent magnet motor 16 capable of changing the amount of magnetic flux configured as described above will be described with reference to the flowcharts of FIGS. , 4 will be used to explain.

  As shown in the flowchart of FIG. 5, first, the control unit 9 predicts the operation mode of the air conditioner 100 by the prediction unit 32 (step ST <b> 1). The control unit 9 receives the operation mode predicted by the prediction unit 32, and determines whether or not the predicted operation mode is a heating operation, that is, whether or not the hermetic compressor 1 is operated at a high frequency. Perform (step ST2). When the operation mode predicted by the prediction unit 32 is the heating operation, that is, when the hermetic compressor 1 is operated by the high frequency operation (YES in step ST2), the control unit 9 is configured to control the permanent magnet motor 16. The amount of magnetic flux is reduced (step ST3).

  When there is an operation instruction in the heating operation mode of the air conditioner 100 from a remote control panel or the like with the amount of magnetic flux varied small, the control unit 9 controls the air conditioner 100 in the heating operation mode. (Step ST4). The control unit 9 performs a heating operation of the air conditioner 100 and determines whether to perform a defrosting operation (step ST5). For example, when the air conditioner 100 is operated for a predetermined time and the temperature of the outdoor heat exchanger 5 becomes equal to or lower than the predetermined temperature, the control unit 9 determines to perform the defrosting operation (YES in step ST5).

  Based on the determination to perform the defrosting operation, as shown in FIG. 3, the control unit 9 first stops the operation of the air conditioner 100 (step ST6). After stopping the operation of the air conditioner 100, the control unit 9 varies the amount of magnetic flux from small to large (step ST7). Next, the control unit 9 performs a defrosting operation (step ST8).

  The control part 9 confirms progress of predetermined time or the temperature of the outdoor heat exchanger 5, and judges the driving | operation or stop of a defrost operation (step ST9). When the predetermined time has elapsed or the temperature of the outdoor heat exchanger 5 is equal to or lower than the predetermined temperature (NO in step ST9), the defrosting operation is continued (step ST8). When the predetermined time has elapsed or the temperature of the outdoor heat exchanger 5 is equal to or higher than the predetermined temperature (YES in step ST9), the control unit 9 operates the air conditioner 100 in the heating operation mode (step ST10). The control unit 9 operates the air conditioner 100 in the heating operation mode and determines whether or not to perform the defrosting operation (step ST11).

  For example, when the temperature of the outdoor heat exchanger 5 becomes equal to or lower than a predetermined temperature, the control unit 9 determines to perform the defrosting operation (YES in step ST11), returns to step ST8, and performs the defrosting operation again. . From step ST9, the same operation is performed. As shown in FIG. 3, the amount of magnetic flux is not varied in the second and subsequent defrosting operations.

  When it is determined that the defrosting operation is not performed (NO in step ST11), the control unit 9 confirms the stop instruction of the air conditioner 100 from the remote operation panel (step ST12), and there is no stop instruction (step ST12). In step ST12 NO), the process returns to step ST10 and the heating operation is continued. From step ST11, the same operation is performed.

  When there is a stop instruction (YES in step ST12), the control unit 9 stops the air conditioner 100. Thereby, the operation of the air conditioner 100 ends.

  In step ST5, when the determination of the defrosting operation is not made (NO in step ST5), the control unit 9 determines whether or not the thermo-off operation, that is, the room temperature Tc is the target set temperature Td ( Step ST13). When the room temperature Tc is equal to or lower than the target set temperature Td (Tc ≦ Td), the control unit 9 continues the heating operation (step ST4). From step ST5, the same operation is performed.

  When the room temperature Tc is higher than the target set temperature Td (YES in step ST13), the control unit 9 stops the heating operation as shown in FIG. 4 (step ST14). After stopping the operation of the air conditioner 100, the controller 9 changes the amount of magnetic flux from small to large (step ST15). Next, the control unit 9 maintains the operation stop state until the room temperature Tc becomes equal to or lower than the target set temperature Td (step ST16). The control unit 9 maintains the operation stop state and monitors the room temperature Tc by the room temperature detector 7 (step ST17). When the room temperature Tc is not equal to or lower than the target set temperature Td (NO in step ST17), the control unit 9 returns to step ST16 and continues to maintain the operation stop state. From step ST17, the same operation is performed.

  When the room temperature Tc becomes equal to or lower than the target set temperature Td (YES in step ST17), the control unit 9 restarts the heating operation (step ST18). The control unit 9 determines the thermo-off operation again (step ST19). If the room temperature Tc is higher than the target set temperature Td (YES in step ST19), the control unit 9 returns to step ST16, and the air conditioner 100 Stop operation. From step ST17, the same operation is performed. Note that the amount of magnetic flux is not varied in the second and subsequent thermo-off operations.

  Next, when the room temperature Tc is equal to or lower than the target set temperature Td, the control unit 9 continues the heating operation, confirms a stop instruction of the air conditioner 100 from the remote control panel (step ST20), and stops. If there is no instruction (NO in step ST20), the process returns to step ST18 and the heating operation is continued. From step ST18, the same operation is performed.

  In addition, when there exists a stop instruction | indication (YES of step ST20), the control part 9 stops the air conditioner 100. FIG. Thereby, the operation of the air conditioner 100 ends.

  In step ST2, when the operation mode predicted by the prediction unit 32 is dehumidification operation or cooling operation, that is, when the hermetic compressor 1 is operated by low frequency operation (NO in step ST2), the control unit 9 Increases the amount of magnetic flux of the permanent magnet motor 16 (step ST21).

  In the state where the amount of magnetic flux is greatly changed, when there is an operation instruction in the dehumidification or cooling operation mode of the air conditioner 100 from the remote control panel or the like, the control unit 9 performs the dehumidification or cooling operation by the air conditioner 100. Perform (step ST4). The controller 9 confirms a stop instruction of the air conditioner 100 from the remote control panel while performing dehumidification or cooling operation (step ST23). If there is no stop instruction (NO in step ST23), the control section 9 proceeds to step ST22. Return and keep driving. When there is an instruction to stop the air conditioner 100 from the remote control panel (YES in step ST23), the control unit 9 stops the operation of the air conditioner 100, thereby ending the operation of the air conditioner 100. To do.

  As described above, the operation of the air conditioner 100 using the hermetic compressor 1 capable of changing the amount of magnetic flux based on the operation mode is performed. In addition, about the prediction of the operation mode of step ST1 mentioned above, the example using the prediction functions 1-3 is demonstrated below using FIGS.

(Prediction function 1)
As shown in FIG. 6, as the prediction of the operation mode, first, the outside air temperature T0 detected by the outside air temperature detector 8 is detected (step ST31). The control unit 9 receives the information on the outside air temperature T0 from the outside air temperature detector 8, and then compares the information with the low outside air temperature T stored in the storage unit 31 of the control unit 9 (step ST32).

  When the outside air temperature T0 is equal to or lower than the low outside air temperature T (T0 ≦ T) (YES in step ST32), the control unit 9 determines that the outside air temperature T0 is low. It is determined that the operation mode is a heating operation. That is, the control unit 9 predicts that the hermetic compressor 1 is operated at a high frequency from the determination that the operation is heating (step ST33).

  When the outside air temperature T0 is higher than the low outside air temperature T (T0> T) (NO in step ST32), it is determined that the dehumidifying or cooling operation is being performed. That is, the control unit 9 predicts that the hermetic compressor 1 is operated at a low frequency from this determination (step ST34). In this way, the control unit 9 predicts the next operation mode of the air conditioner 100 by the prediction function 1 of the prediction unit 32.

  In the above-described determination of NO in step ST32 (T0> T), it is sufficiently assumed that the heating operation is performed. However, since the set temperature is low or the difference from the outside air temperature is small, the low frequency It can be handled even during driving. Moreover, since this judgment changes with the low outside temperature T memorize | stored in the memory | storage means 31, the detail is abbreviate | omitted here.

(Prediction function 2)
As shown in FIG. 7, as a prediction of the operation mode, first, the control unit 9 confirms the previous operation mode of the air conditioner 100 stored in the storage unit 31 (step ST41), and at the same time the previous air conditioner. It is determined whether or not the operation mode 100 is a heating operation (step ST42). When the previous operation mode is the heating operation (YES in step ST42), the control unit 9 determines that the next operation mode of the air conditioner 100 is the heating operation. That is, the control unit 9 predicts that the hermetic compressor 1 is operated at a high frequency from the determination that the operation is heating (step ST43).

  When the previous operation mode is the dehumidifying operation or the cooling operation (NO in step ST42), the control unit 9 determines that the next operation mode is the dehumidifying or cooling operation. That is, the control unit 9 predicts that the hermetic compressor 1 is operated at a low frequency from this determination (step ST44). In this way, the control unit 9 predicts the next operation mode of the air conditioner 100 by the prediction function 2 of the prediction unit 32.

(Prediction function 3)
As shown in FIG. 8, as the prediction of the operation mode, first, the control unit 9 confirms the preheating control (step ST51), and determines whether or not the preheating control is being executed (step ST52). When the preheating control is being executed (YES in step ST52), the control unit 9 determines that the next operation mode of the air conditioner 100 is the heating operation. That is, the control unit 9 predicts that the hermetic compressor 1 is operated at a high frequency from the determination that the operation is heating (step ST53).

  When preheating control is not performed (NO in step ST52), control unit 9 determines that the next operation mode is dehumidification or cooling operation. That is, the controller 9 predicts that the hermetic compressor 1 is operated at a low frequency from this determination (step ST54). In this way, the control unit 9 predicts the next operation mode of the air conditioner 100 by the prediction function 2 of the prediction unit 32.

  The prediction of the next operation mode is performed using any one of the prediction functions 1 to 3 of the prediction means 32, and the control unit 9 determines the next operation mode based on the predicted operation mode (step ST2). From the determination of the operation mode, the control unit 9 changes the magnetic flux amount of the permanent magnet motor 16 to an efficient magnetic flux amount at a rotation speed suitable for the next operation mode, so that the efficient operation of the hermetic compressor 1 is performed. Is possible.

  According to the air conditioner 100 configured as described above, the operation mode is predicted by the prediction unit 32, and the air conditioner 100 is stopped by setting the magnetic flux amount of the permanent magnet motor 16 suitable for each operation mode. The air conditioner 100 can be operated after changing the magnetic flux, and the air conditioner 100 can be operated with high efficiency.

  Further, the prediction means 32 uses any one of the prediction functions 1 to 3 suitable for the use of the air conditioner 100 to reliably predict the next operation mode, particularly the heating operation, thereby reducing the amount of magnetic flux. In this state, the hermetic compressor 1 can be operated at a high frequency operation, and the rising of the heating operation can be made highly efficient and have a high capacity.

  In particular, since the start of heating operation requires high capacity, it is necessary to operate the hermetic compressor 1 at a high rotation frequency. For this reason, by making the amount of magnetic flux small, high-efficiency operation at a high frequency is possible. In addition, after the heating operation has been performed for a certain period of time or after the target set temperature Td has been reached, the rotational speed of the hermetic compressor 1 is operated at a low frequency. Highly efficient operation is possible.

  That is, according to the operating condition of the air conditioner 100, it is possible to obtain an air conditioner 100 capable of high-efficiency and high-capacity operation by setting the magnetic flux amount to be efficient.

  Moreover, when changing the magnetic flux amount from small to large in the heating operation mode, the air conditioner 100 is not unnecessarily stopped by changing the magnetic flux amount during the dehumidifying operation or the thermo-off operation. For this reason, the intermittent operation of the air conditioner 100 can be prevented, loss due to the intermittent operation can be prevented, and the air conditioner 100 can be operated efficiently.

  As described above, according to the air conditioner 100 according to the present embodiment, the hermetic compressor 1 is driven by the amount of magnetic flux suitable for the operation mode predicted by the prediction unit 32, thereby achieving high efficiency and high It becomes possible to drive the air conditioner 100 with the capability. Further, by changing the amount of magnetic flux by preventing intermittent operation according to the heating operation status, loss due to intermittent operation is prevented and efficient operation of the air conditioner 100 becomes possible.

  The present invention is not limited to the above embodiment. For example, in the above-described example, as illustrated in FIGS. 3 and 5, in the defrosting operation after the heating operation, the defrosting operation is performed after changing the magnetic flux amount from small to large, but the present invention is not limited thereto. For example, as shown in FIG. 9, after performing the defrosting operation continuously after the heating operation, the magnetic flux amount may be changed from small to large when switching to the heating operation.

  In the above-described example, the prediction unit 32 has the prediction functions 1 to 3 and the operation mode is predicted using any of these prediction functions. However, the air conditioner 100 has the prediction functions 1 to 3. Or may have any one of them. That is, it is only necessary to have a prediction function that can predict at least the heating operation depending on the use application of the air conditioner 100. Furthermore, although it is desirable to have any of the above-described prediction functions, a prediction function other than the above-described prediction functions 1 to 3 may be used as long as heating operation can be predicted.

  In the above-described example, the thermo-off operation stops the heating operation at a temperature at which the room temperature Tc is higher than the target set temperature Td, but is not limited thereto. Specifically, in the heating operation, the heating operation is stopped when the room temperature Tc is adjusted to a temperature higher than the target set temperature Td. However, the room temperature Tc may not rise to the target set temperature Td. is there.

  In such a case, the thermo-off is not performed. For this reason, the amount of magnetic flux cannot be changed from small to large, and the hermetic compressor 1 may be driven at a low frequency even though the amount of magnetic flux is small. For this reason, as shown in FIG. 10, the controller 9 may set the target set temperature Td to a lower temperature at the first thermo-off than at the second and subsequent thermo-off.

  More specifically, the control unit 9 has a function of counting the number of thermo-offs. In the determination of thermo-off in step ST13 of FIG. 5, the control unit 9 counts the number of times of the next thermo-off after the start of the heating operation mode as shown in FIG. 10 (step ST61). For example, if the thermo-off has not yet been performed (n = 0), the next thermo-off count is n = n + 1 = 0 + 1, and the next thermo-off is counted as the first time.

  Next, the controller 9 determines whether or not the next thermo-off is the first time (n = 1) (step ST62). For example, when the next thermo-off is the first time (YES in step ST62), the target set temperature is set to Td−ΔT (step ST63). That is, a temperature lower by an arbitrary temperature ΔT is set as a target set temperature.

  In the second and subsequent thermo-off (NO in step ST62), the target set temperature Td is set. Thus, by setting the target set temperature Td = Td−ΔT for performing the first thermo-off, the thermo-off is performed at a temperature lower than the target set temperature, and the amount of magnetic flux is increased. For this reason, the amount of magnetic flux can be changed reliably, and the amount of magnetic flux can be made efficient. As a result, the highly efficient air conditioner 100 can be operated.

  Further, in the above-described example, at the start of the heating operation mode of the air conditioner 100, the permanent magnet electric motor 16 is operated with a reduced magnetic flux, but the present invention is not limited to this. That is, the heating operation mode has been described as an example of the operation of the hermetic compressor 1 at a high frequency with a large air conditioning load by operating with a small amount of magnetic flux. However, the operation is not limited to the heating operation mode. It may be a mode. That is, in the operation mode of the air conditioner 100, the amount of magnetic flux can be varied to be small or large depending on the size of the air conditioning load, for example, the operating frequency of the hermetic compressor 1 or the amount of heat required for the air conditioner. Any configuration is applicable. In addition, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Hermetic compressor, 2 ... Four-way valve, 3 ... Indoor heat exchanger, 4 ... Expansion device, 5 ... Outdoor heat exchanger, 6 ... Accumulator, 7 ... Room temperature detector, 8 ... Outside air temperature detector, 9 ... Outside temperature detector, 10... Airtight container, 11a. 11b ... Suction port, 12 ... Discharge pipe, 13a. 13 ... Suction pipe, 16 ... Permanent magnet motor, 16 ... Hermetic compressor, 17 ... Compression mechanism, 21 ... Power supply unit, 22 ... Stator, 23 ... Rotor, 23a ... First core, 23b ... Second Core, 24 ... rotating shaft, 26a. 26b ... compression chamber, 27a. 27b ... roller 28 ... first permanent magnet 29 ... second permanent magnet 31 ... storage means 32 ... predicting means 100 ... air conditioner F ... flow of refrigerant during heating operation, G ... cooling operation Refrigerant flow, S ... signal line, T ... predetermined temperature (low outside air temperature), Tc ... room temperature, Td ... target set temperature, T0 ... outside air temperature.

Claims (5)

In an air conditioner including a hermetic compressor having a permanent magnet motor capable of changing the amount of magnetic flux in at least two stages,
Predicting means for predicting an air conditioning load before operation of the hermetic compressor;
A controller that operates the hermetic compressor and varies the amount of magnetic flux based on the air conditioning load predicted by the prediction unit;
The controller is configured to operate the hermetic compressor by setting a magnetic flux amount of the permanent magnet motor to be small when the air conditioning load is predicted to be large by the predicting unit. .   The air conditioner according to claim 1, wherein the predicting means predicts the air conditioning load based on an outside air temperature at the start of the operation.   The predicting means predicts the operation mode at the previous stop of the hermetic compressor as the operation mode at the next operation of the hermetic compressor, and increases the air conditioning load when predicting the heating operation. The air conditioner according to claim 1, wherein the air conditioner is predicted. The control unit is configured to be capable of preheating the permanent magnet motor,
The air conditioner according to claim 1, wherein the predicting unit predicts that the air conditioning load is large when the permanent magnet motor is preheated. The controller is configured to be capable of defrosting operation to defrost frost attached to an outdoor heat exchanger or thermo-off to temporarily stop the hermetic compressor when the room temperature is air-conditioned to the target room temperature,
5. The air conditioner according to claim 1, wherein the amount of magnetic flux set to the small value is changed to a large value during the defrosting operation or when the thermo is off.

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