JPWO2018037458A1 - Refrigeration cycle device, air conditioner and heat pump water heater - Google Patents

Abstract

A refrigeration cycle apparatus according to the present invention includes a compressor (1) including a dual three-phase motor (2) having a first number of winding parts (3, 4) which is an integer of 2 or more. A circuit and a second number of inverters (11, 12) connected one-to-one with any one of the first number of windings, wherein the windings correspond to each of the three phases And the first number and the second number are the same, the refrigeration cycle circuit adjusts the temperature of the object, and the absolute value of the difference between the temperature of the object and the target temperature is the threshold If it is less than or equal to the value, the operation of the third number of inverters is stopped, and the third number is one or more and less than the second number.

Description

  The present invention relates to a refrigeration cycle apparatus, an air conditioner, and a heat pump cold / hot water generating apparatus.

  Patent Document 1 describes a synchronous motor drive system provided with a conventional synchronous motor applicable to a refrigeration cycle apparatus. The synchronous motor drive system described in Patent Document 1 includes a synchronous motor and a drive device. The synchronous motor includes a rotor and a stator, and at least one pair of adjacent two stator teeth has a slit at its tip, and a plurality of stator teeth are wound in concentrated windings respectively. A main winding is disposed, and further, a secondary winding wound around two adjacent stator teeth is disposed at the slit of each stator tooth. The driving device individually controls the current flowing through the main winding and the current flowing through the sub-winding, and when the required torque is less than a predetermined value, the current flows only through the main winding, and the required torque is predetermined In the case of the value or more, the current is controlled to flow in both the main winding and the sub-winding.

International Publication No. 2011/102114

  In the synchronous motor drive system described in Patent Document 1, it is determined whether current is to be supplied to only the main winding or to both the main and sub windings according to the required torque. In the case of torque, current is applied to both the main and auxiliary windings. In the case where the refrigeration cycle load is stable, for example, under conditions such as the heating intermediate condition and the cooling intermediate condition in the air conditioner, in the refrigeration cycle apparatus mounted on the air conditioner or the like, the case of low rotation and high torque There is. Therefore, when the compressor motor is driven under this condition, current may flow in both the main winding and the sub-winding, and iron loss generated by the motor increases. That is, there has been a problem that when current is supplied to both the main winding and the sub-winding, the loss is larger than in the case where current is supplied only to the main winding.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a refrigeration cycle apparatus capable of reducing the loss generated by a motor provided with a plurality of windings.

  In order to solve the problems described above and to achieve the object, a refrigeration cycle apparatus according to the present invention includes a compressor including a three-phase motor having a first number of winding portions that is an integer of 2 or more. A cycle circuit and a second number of inverters connected one-to-one with any one of the first number of winding parts. The winding portion includes three windings corresponding to each of three phases, the first number and the second number are the same, and the refrigeration cycle circuit adjusts the temperature of the object, and the temperature of the object and When the absolute value of the difference from the target temperature is equal to or less than the threshold value, the operation of the third number of inverters is stopped, and the third number is one or more and less than the second number.

  ADVANTAGE OF THE INVENTION The refrigeration cycle apparatus concerning this invention is effective in the ability to make the loss which generate | occur | produces with the motor provided with multiple winding small.

A figure showing an example of composition of an air harmony device provided with a refrigerating cycle device concerning Embodiment 1 The flowchart which shows one example of the inverter control operation which the outdoor unit control section which depends on the execution form 1 executes The flowchart which shows the other example of the inverter control operation which the outdoor unit control section which depends on the execution form 1 executes The flowchart which shows the other example of the inverter control operation which the outdoor unit control section which depends on the execution form 1 executes The figure which shows the structural example of the air conditioning apparatus provided with the refrigerating-cycle apparatus concerning Embodiment 2. The flowchart which shows an example of the operation which the outdoor unit control section concerning Embodiment 2 measures the accumulation run time of the 1st inverter The flowchart which shows one example of the inverter control operation which the outdoor unit control section which depends on the form 2 execution A figure showing an example of hardware constitutions of an outdoor unit control part concerning Embodiment 1 and 2. A figure showing an example of hardware constitutions of an outdoor unit control part concerning Embodiment 1 and 2.

  Hereinafter, a refrigeration cycle apparatus, an air conditioning apparatus, and a heat pump cold / hot water generating apparatus according to an embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a view showing a configuration example of an air conditioner provided with a refrigeration cycle apparatus according to a first embodiment of the present invention.

  The air conditioner 100 shown in FIG. 1 has an outdoor unit 15 installed outdoors, an indoor unit 16 installed indoors, and an instruction for an air conditioner main body formed by the outdoor unit 15 and the indoor unit 16 from the outside. That is, the controller 19 received from the user is provided.

  The outdoor unit 15 includes a compressor 1 forming a refrigeration cycle circuit, an electronic expansion valve 5, an outdoor heat exchanger 6 and a four-way valve 8, an outdoor fan 9 for blowing air to the outdoor heat exchanger 6, and an outdoor unit 15. And an outdoor control board 14 for controlling each part of

  The compressor 1 includes a dual three-phase motor 2 which is a three-phase motor having two windings of an electrically independent first winding portion 3 and a second winding portion 4. Each winding portion of the first winding portion 3 and the second winding portion 4 is configured to include three windings corresponding to three phases, that is, U phase, V phase and W phase.

  The outdoor control board 14 has a first inverter 11 connected to the first winding 3 of the dual three-phase motor 2 and a second inverter 14 connected to the second winding 4 of the dual three-phase motor 2. The outdoor unit control unit 13 operates as a control unit that controls the inverter 12 and the first inverter 11 and the second inverter 12 and controls each unit in the outdoor unit 15.

  Here, semiconductor elements such as switching elements and diode elements constituting the first inverter 11 are formed of wide band gap semiconductors such as GaN (Gallium Nitride, gallium nitride), SiC (Silicon Carbide, silicon carbide) or diamond. . The switching element and the diode element formed by the wide band gap semiconductor have high voltage resistance and high allowable current density. Therefore, it is possible to miniaturize the switching element and the diode element, and by using the miniaturized switching element and the diode element, it is possible to miniaturize the semiconductor module incorporating these elements, that is, the first inverter 11. It becomes.

  The switching element and the diode element formed of the wide band gap semiconductor also have high heat resistance. Therefore, the size of the heat dissipating fins of the heat sink can be reduced, and the air cooling of the water cooling portion can be performed, so that the size of the semiconductor module can be further reduced.

  Furthermore, switching elements and diode elements formed by such wide band gap semiconductors have low power loss. Therefore, the efficiency of the switching element and the diode element can be increased, and thus the efficiency of the semiconductor module can be increased.

  On the other hand, the switching element and the diode element constituting the second inverter 12 are formed of Si (Silicon, silicon) semiconductor.

  Further, the indoor unit 16 includes an indoor heat exchanger 7 forming a refrigeration cycle circuit, an indoor fan 10 for blowing air to the indoor heat exchanger 7, and an indoor control board 17 for controlling each part of the indoor unit 16; Equipped with The indoor control board 17 includes an indoor unit control unit 18 that communicates with the controller 19 and the outdoor unit control unit 13 and controls the indoor fan 10.

  The indoor unit controller 18 and the outdoor unit controller 13 can communicate with each other by a wired communication circuit. The indoor unit control unit 18 and the outdoor unit control unit 13 may communicate with each other wirelessly.

  The controller 19 is configured to be communicable with the indoor unit control unit 18 using wireless communication such as infrared communication or wireless LAN (Local Area Network). The controller 19 and the indoor unit controller 18 may be connected by a wired communication circuit. The controller 19 provides the user with various functions including a function to set the room temperature, and receives the room temperature setting and other various settings.

  In addition, the compressor 1, the electronic expansion valve 5, the outdoor heat exchanger 6, the indoor heat exchanger 7, and the four-way valve 8 are connected by a refrigerant pipe to form a refrigeration cycle, and the refrigerant circulates through these parts. It is done. The components of the outdoor unit 15 and the components of the indoor unit 16 shown in FIG. 1 form the refrigeration cycle apparatus 50 according to the first embodiment.

  Further, the copper loss and iron loss generated in the rotor and the stator, which are not shown in the double three-phase motor 2, are twice the iron loss of the rotor and stator under the intermediate load condition of the air conditioner 100. It is designed to be. The intermediate load condition is a condition in which the output of the air conditioner 100 has an intermediate value, ie, an intermediate capacity, of the rated capacity. In such a dual three-phase motor 2, when operating with either one of the first inverter 11 and the second inverter 12, it operated with both the first inverter 11 and the second inverter 12. Iron loss is smaller than in the case. In addition, what is necessary is just to be designed so that the iron loss of the rotor and stator of the dual three-phase motor 2 is twice or more of the copper loss, and the iron loss is limited to the rotor and stator which is twice the copper loss. is not.

  Next, the operation of the air conditioner 100 will be described. In the outdoor unit 15 of the air conditioning apparatus 100 according to the first embodiment, the outdoor unit control unit 13 drives the dual three-phase motor 2 by controlling the first inverter 11 and the second inverter 12. Thereby, the compressor 1 provided with the dual three-phase motor 2 operates to compress the refrigerant. In addition, the outdoor unit control unit 13 operates the outdoor fan 9 to blow air to the outdoor heat exchanger 6, and the outdoor heat exchanger 6 exchanges heat. In the indoor unit 16, the indoor unit control unit 18 operates the indoor fan 10 to blow air to the indoor heat exchanger 7, and the indoor heat exchanger 7 exchanges heat. Although FIG. 1 shows the configuration in the case where there is one indoor unit, the present invention is not limited to this configuration, and a plurality of indoor units may be provided. Depending on the number of indoor units, a plurality of parts on the refrigeration cycle circuit may be provided. It goes without saying that it may be configured to include parts such as a strainer, an accumulator and a muffler.

  Further, the outdoor unit control unit 13 opens and closes the valve of the electronic expansion valve 5 so as to adjust the temperatures of the outdoor heat exchanger 6 and the indoor heat exchanger 7, and the flow rate and pressure of the refrigerant. Further, the outdoor unit controller 13 controls the valve of the four-way valve 8 so that the refrigerant flows in the opposite direction in the cooling operation and the heating operation.

  Next, an operation of the outdoor unit controller 13 controlling the operation of the first inverter 11 and the second inverter 12 will be described with reference to FIG. FIG. 2 is a flowchart showing an example of the inverter control operation performed by the outdoor unit control unit 13 according to the first embodiment.

  When the outdoor unit control unit 13 starts the operation shown in FIG. 2, it waits for communication with the indoor unit control unit 18 such as periodic communication or interruption communication from the indoor unit control unit 18 to occur. When communication with the indoor unit control unit 18 occurs, the outdoor unit control unit 13 checks whether or not an air conditioning operation stop instruction has been received from the indoor control device 18 (step S1). The outdoor unit controller 13 stops the first inverter 11 and the second inverter 12 when receiving the air conditioning operation stop instruction (step S1: Yes) (step S10). When the outdoor unit control unit 13 receives an instruction different from the air conditioning operation stop instruction, for example, an instruction to start the air conditioning operation, an instruction to change the operation mode, or the like indicating the start or continuation of the operation (Step S1: No ), It is confirmed whether the first inverter 11 is stopped (step S2).

  When the first inverter 11 is stopped (step S2: Yes), the outdoor unit controller 13 starts the operation of the first inverter 11 (step S3), and acquires data of the room temperature and the set temperature (step S3). S4). On the other hand, when the first inverter 11 is not stopped, that is, in operation (step S2: No), the outdoor unit controller 13 acquires data of the room temperature and the set temperature (step S4). In step S4, the outdoor unit control unit 13 acquires data of the set temperature and the current indoor temperature from among data transmitted from the indoor unit control unit 18 through the periodic communication and the interrupt communication. The outdoor unit control unit 13 may request the indoor unit control unit 18 to transmit data of the set temperature and the current room temperature, and may obtain these data.

  Next, the outdoor unit controller 13 calculates the difference between the set temperature acquired in step S4 and the current indoor temperature, and checks whether the calculated difference is ± 2 ° C. or less (step S5). The process of step S5 is a process in which the outdoor unit control unit 13 determines whether the indoor temperature approaches the set temperature which is the target temperature. When the indoor temperature approaches the set temperature which is the target temperature, the refrigeration cycle circuit is in a light load state. Therefore, the process of step S5 can be said to be a process for determining whether or not the refrigeration cycle circuit is in the light load state. The outdoor unit controller 13 may obtain data of the difference between the set temperature and the current indoor temperature in step S4. That is, the indoor unit control unit 18 may calculate the difference between the set temperature and the current indoor temperature, and transmit data of the calculated difference to the outdoor unit control unit 13.

  If the difference between the set temperature and the current indoor temperature is ± 2 ° C. or less (step S5: Yes), the outdoor unit controller 13 checks whether the second inverter 12 is in operation (step S6). When the second inverter 12 is in operation (step S6: Yes), the outdoor unit controller 13 stops the second inverter 12 (step S7), and returns to step S1. That is, the outdoor unit controller 13 waits for the next communication with the indoor unit controller 18 to occur. When the second inverter 12 is not in operation, that is, when the second inverter 12 is not in operation (step S6: No), the outdoor unit controller 13 returns to step S1.

  In addition, when the difference between the set temperature and the current indoor temperature is not ± 2 ° C. or less (step S5: No), the outdoor unit controller 13 confirms whether the second inverter 12 is stopped (step S5). S8). When the second inverter 12 is stopped (step S8: Yes), the outdoor unit controller 13 starts the operation of the second inverter 12 (step S9), and returns to step S1. The outdoor unit controller 13 returns to step S1 when the second inverter 12 is not in operation, that is, in operation (step S8: No).

  As described above, in the control operation illustrated in FIG. 2, the outdoor unit control unit 13 operates the second inverter 12 based on the difference between the set temperature and the indoor temperature that is the temperature of the temperature adjustment target. Change Specifically, when the absolute value of the difference between the set temperature and the room temperature is equal to or less than a predetermined threshold value, the outdoor unit control unit 13 stops the second inverter 12 and sets the set temperature and the room temperature. The second inverter 12 is operated when the absolute value of the difference between the two is larger than a predetermined threshold value.

  Further, as shown in FIG. 3, when the air conditioning load condition of the air conditioner 100 is an intermediate load condition, that is, a cooling intermediate condition or a heating intermediate condition, control may be performed to change the operating state of the second inverter 12. The intermediate load condition is a condition in which the output of the air conditioner 100 has an intermediate value of the rated capacity.

  FIG. 3 is a flowchart showing another example of the inverter control operation performed by the outdoor unit controller 13 according to the first embodiment. The flowchart shown in FIG. 3 is obtained by replacing steps S4 and S5 of the flowchart shown in FIG. 2 with steps S4a and S5a. The other steps are the same as the steps denoted by the same step numbers in FIG. 2, and thus the description of the process of each step is omitted.

  In step S4a of the inverter control operation shown in FIG. 3, the outdoor unit control unit 13 acquires data of the air conditioning condition of the air conditioning apparatus 100. Specifically, the outdoor unit control unit 13 acquires data of the air conditioning condition from among data transmitted from the indoor unit control unit 18 through regular communication and interrupt communication, and the like. The outdoor unit control unit 13 may request the indoor unit control unit 18 to transmit data of the air conditioning condition, and acquire this data.

  In step S5a, the outdoor unit control unit 13 checks whether the air conditioning condition of the air conditioner 100 is under the cooling intermediate condition if it is in the cooling operation, and if it is in the heating operation, if it is the heating intermediate condition or less. Confirm. In the confirmation of whether or not the cooling intermediate condition or less, it is checked whether or not the cooling is performed with the capacity equal to or less than the intermediate value of the cooling rating condition, that is, the intermediate value or less of the cooling rated capacity. Moreover, in confirmation of whether it is below heating intermediate condition, it is confirmed whether it is below the middle value of heating rated condition, ie, it is heating by the capacity | capacitance below the intermediate value of heating rated capacity.

  The outdoor unit control unit 13 proceeds to step S6 when the air conditioning condition is less than or equal to the intermediate condition, that is, less than or equal to the cooling intermediate condition or less than or equal to the heating intermediate condition (step 5a: Yes). On the other hand, when the air conditioning condition is not equal to or less than the intermediate condition, that is, greater than the cooling intermediate condition or larger than the heating intermediate condition (step S5a: No), the outdoor unit controller 13 proceeds to step S8.

  Also, instead of the inverter control operation based on the difference between the set temperature and the room temperature shown in FIG. 2 and the air conditioning load condition shown in FIG. 3, the inverter control operation based on the energy saving request of the user is performed. You may For example, the controller 19 is provided with a function for selecting the energy saving mode in which the user prioritizes energy saving over comfort, that is, saving of the electricity cost, and the user selects the energy saving mode or not. The indoor unit control unit 18 changes the operation of the second inverter. A flowchart of this control operation is shown in FIG.

  FIG. 4 is a flowchart showing another example of the inverter control operation performed by the outdoor unit controller 13 according to the first embodiment. The flowchart shown in FIG. 4 is obtained by replacing steps S4 and S5 of the flowchart shown in FIG. 2 with steps S4 b and S5 b. The other steps are the same as the steps denoted by the same step numbers in FIG. 2, and thus the description of the process of each step is omitted.

  In step S4b of the inverter control operation shown in FIG. 4, the outdoor unit control unit 13 acquires data of the operation mode of the air conditioning apparatus 100. Specifically, the outdoor unit control unit 13 acquires data of the operation mode from among data transmitted from the indoor unit control unit 18 through regular communication and interrupt communication, and the like. The outdoor unit control unit 13 may request the indoor unit control unit 18 to transmit data of the operation mode and acquire this data.

  In step S5b, the outdoor unit control unit 13 checks whether the operation mode of the air conditioner 100 is the energy saving mode, and in the case of the energy saving mode (step S5b: Yes), proceeds to step S6 and does not enter the energy saving mode ( Step S5b: No) Go to Step S8.

  In the control operation shown in FIG. 2 to FIG. 4, the example has been described in which the first inverter 11 is operated at all times and the second inverter 12 is stopped when the prescribed conditions are satisfied. The inverter 12 may be operated at all times, and the first inverter 11 may be stopped when the prescribed condition is satisfied. In addition, whether the first inverter 11 is stopped or the second inverter 12 is stopped when the prescribed condition is satisfied, that is, the inverter that is always operated and the inverter that may be stopped are switched under a certain condition. May be In addition, the configuration having three or more inverters, that is, the number of winding portions of the three-phase motor provided in the compressor 1 is three or more, and the inverters are individually provided for each of the plurality of winding portions of the three-phase motor Even in the connected configuration, the number of inverters operated according to the air conditioning load may be controlled to reduce the loss. Assuming that the number of windings of the three-phase motor is a first number and the number of inverters is a second number, the first number and the second number are the same, and 1 when the air conditioning load is in a light load state. More than one inverter and less than the second number of inverters may be stopped.

  In the present embodiment, the semiconductor element constituting the first inverter 11 is constituted by a wide band gap semiconductor such as a SiC semiconductor, and the semiconductor element constituting the second inverter 12 is constituted by a Si semiconductor. In the case of operating on a stand, the first inverter 11 is operated. However, the present invention is not limited to this, and the semiconductor element of the second inverter 12 may also be made of a wide band gap semiconductor. .

  Moreover, although the example in the case where the refrigerating cycle apparatus 50 comprises the air conditioning apparatus 100 was demonstrated in this Embodiment, when the refrigerating cycle apparatus 50 comprises heat pump cold-water water generating apparatuses, such as a heat pump water heater and a chiller. Similar control is possible even if there is. Specifically, based on the difference between the target temperature and the current temperature of the cold or hot water, that is, the temperature of the temperature adjustment target, the second inverter is used when the absolute value of the difference is equal to or less than a predetermined threshold value. Control operation such as operating the second inverter 12 is possible by stopping 12 and operating the second inverter 12 when the absolute value of the difference is larger than the threshold value.

  As described above, the refrigeration cycle apparatus 50 of the air conditioning apparatus 100 according to the present embodiment, according to the load of the refrigeration cycle circuit, specifically, when the refrigeration cycle circuit is a light load, the first inverter Since only the 11 is operated to stop the second inverter 12, it is possible to reduce the loss generated by the dual three-phase motor 2 in a state where the load of the refrigeration cycle circuit is stable at light load. it can.

Second Embodiment
FIG. 5 is a view showing a configuration example of an air conditioning apparatus provided with a refrigeration cycle apparatus according to a second embodiment of the present invention.

  The air conditioning apparatus 100a according to the second embodiment is obtained by replacing the refrigeration cycle apparatus 50 of the air conditioning apparatus 100 according to the first embodiment with a refrigeration cycle apparatus 50a. The refrigeration cycle apparatus 50a is obtained by replacing the outdoor unit 15 of the refrigeration cycle 50 with an outdoor unit 15a. Further, the outdoor unit 15a is obtained by replacing the outdoor control board 14 of the outdoor unit 15 described in the first embodiment with an outdoor control board 14a. Therefore, in the present embodiment, the outdoor control board 14a having a configuration different from the air conditioner 100 according to the first embodiment will be described, and the description of the same components as the air conditioner 100 will be omitted.

  The outdoor control board 14 a is obtained by replacing the outdoor unit control unit 13 of the outdoor control board 14 described in the first embodiment with the outdoor unit control unit 13 a and further adding a storage unit 21. However, the 1st inverter 11 and the 2nd inverter 12 shall be comprised with the same semiconductor. That is, when the first inverter 11 is configured of a wide band gap semiconductor, the second inverter 12 is also configured of the same wide band gap semiconductor.

  The outdoor unit controller 13 a operates as a controller that controls the first inverter 11 and the second inverter 12 and controls each unit in the outdoor unit 15. Further, the outdoor unit control unit 13a further has a function of individually measuring the operating time of the first inverter 11 and the second inverter 12 using the counter unit 20, the operating time of the first inverter 11, and And a function of stopping one of the inverters based on the operating time of the second inverter 12. Although the outdoor control board 14a is configured to include the storage unit 21 outside the outdoor unit control unit 13a, the outdoor control substrate 14a may include the storage unit 21 inside the outdoor unit control unit 13a. The counter unit 20 is configured to include a plurality of counters. The storage unit 21 stores the cumulative operating time of the first inverter 11 and the cumulative operating time of the second inverter 12.

  In the outdoor unit 15a of the air conditioner 100a shown in FIG. 5, the operation method of the inverter is changed according to the cumulative operation time of each inverter of the first inverter 11 and the second inverter 12. Specifically, when the outdoor unit control unit 13a satisfies the condition for stopping one of the first inverter 11 and the second inverter 12, the outdoor unit control unit 13a stops the one with the longer cumulative operation time. The conditions for stopping one of the first inverter 11 and the second inverter 12 are the same as the conditions for stopping the second inverter 12 in the air conditioning apparatus 100 according to the first embodiment. That is, the conditions shown in step S5 in FIG. 2, the conditions shown in step S5a in FIG. 3, or the conditions shown in step S5b in FIG.

  FIG. 6 is a flowchart showing an example of an operation of the outdoor unit control unit 13a according to the second embodiment to measure the cumulative operation time of the first inverter 11.

  The outdoor unit control unit 13a generates an interrupt, for example, at regular intervals, and executes a series of processes from step S21 to step S25 shown in FIG. Depending on the accuracy, the processing interrupt time interval may be relatively long, for example, every 10 seconds. The initial value of the operating time counter of the first inverter 11 is zero.

  The outdoor unit controller 13a first confirms whether or not the first inverter 11 is stopped (step S21). If the first inverter 11 is stopped (step S21: Yes), the outdoor unit control unit 13a The operating time counter is stopped (step S22). The outdoor unit control unit 13a uses one of the plurality of counters constituting the counter unit 20 as the operation time counter of the first inverter.

  When the first inverter 11 is in operation (No in step S21), the outdoor unit control unit 13a checks whether the operation time counter of the first inverter is in suspension (step S25). When the operation time counter of the first inverter is stopped (step S25: Yes), the outdoor unit controller 13a starts counting by the operation time counter of the first inverter (step S26), and ends the process.

  After stopping the operation time counter of the first inverter in step S22, the outdoor unit control unit 13a next calculates the accumulated operation time of the first inverter 11 (step S23). Specifically, the outdoor unit control unit 13a stores the count value of the operation time counter of the first inverter as the accumulated operation time of the first inverter 11 until then, that is, the first stored value of the storage unit 21. The cumulative operating time of the inverter 11 is added, and the cumulative operating time of the first inverter 11 is updated. The outdoor unit control unit 13a outputs the accumulated operating time of the first inverter 11 after the update to the storage unit 21 and stores it.

  After calculating the accumulated operation time of the first inverter 11 in step S23, the outdoor unit control unit 13a clears or initializes the operation time counter of the first inverter 11 (step S24), and ends the process. . The outdoor unit controller 13a may start counting after clearing the operation time counter of the first inverter 11 when starting counting in step S26 described above. In this case, after executing step S23, the outdoor unit control unit 13a ends the process without executing step S24.

  Although the process of calculating the cumulative operation time of the first inverter 11 has been described, the outdoor unit control unit 13a also calculates the cumulative operation time of the second inverter 12 by the same procedure. The method of calculating the cumulative operation time of the first inverter 11 shown in FIG. 6 is an example, and may be calculated by another method.

  As described above, when the outdoor unit control unit 13a operates one of the first inverter 11 and the second inverter 12 and stops the other, the cumulative operation time of the first inverter 11, and the second The operation of the compressor 1 is operated by stopping the inverter with the longer cumulative operating time by comparing with the cumulative operating time of the inverter 12 of FIG. The reason for this operation is that the temperature cycle life where the semiconductor chip deteriorates due to the heat generated by the operation of the inverter is extended, and the semiconductor chip and peripheral parts etc. thermally expand and wires and solder around the semiconductor chip This is to postpone the deterioration due to stress or the like. When operating a compressor by driving multiple three-phase motors with multiple inverters, the number of times the inverter is operated and stopped is more than when operating a three-phase motor by operating one inverter. , Deterioration is accelerated. Therefore, the outdoor unit control unit 13a determines the inverter to be stopped in consideration of the cumulative operation time of each inverter.

  In addition, the life of each electrolytic capacitor and film capacitor connected to the inputs of the plurality of inverters changes under the influence of the magnitude of the current flow, the current flow time, and the ambient temperature. Therefore, by equalizing the accumulated operation time of the plurality of inverters, the life of the electronic components such as the electrolytic capacitor and the film capacitor can be extended, and the first inverter 11 and the second inverter 12, that is, the outdoor control board The reliability of 14 can be improved. Also, by properly designing the life, the cost of the life parts can be reduced.

  Next, the operation of the outdoor unit controller 13a controlling the operation of the first inverter 11 and the second inverter 12 will be described with reference to FIG. FIG. 7 is a flowchart showing an example of the inverter control operation performed by the outdoor unit control unit 13a according to the second embodiment.

  The outdoor unit controller 13a executes the operation shown in FIG. 7 when a defined interrupt occurs. A prescribed interrupt that triggers the start of the operation shown in FIG. 7 occurs at regular intervals. That is, the outdoor unit controller 13a repeatedly executes the operation shown in FIG. 7 at regular intervals. Note that, in the operation shown in FIG. 7, an initial value of a longest operation time inverter determination flag indicating whether or not a specified time has elapsed, and an initial value of a longest operation time inverter determined time counter for counting the specified time The values are both zero.

  When the operation shown in FIG. 7 is started, the outdoor unit control unit 13a first confirms whether a partial inverter stop condition which is a condition for stopping a partial inverter is satisfied (step S31). When the outdoor unit control unit 13a partially satisfies the inverter stop condition (step S31: Yes), the outdoor unit control unit 13a confirms the longest operation time inverter determination flag (step S32). The outdoor unit control unit 13a sets the longest operation time inverter determination flag to 1 when the longest operation time inverter determination flag is 0 (longest operation time inverter determination flag = 0) (step S32: Yes) (maximum operation time inverter determination The flag is set to 1) (step S33). Here, the reason why the longest time operation inverter finalization flag is provided is that the cumulative operation times of the plurality of inverters are similar if only the operation times of the plurality of inverters (the first inverter 11 and the second inverter 12) are compared. In this case, replacement of the stopped inverters is hunting, so that one of the inverters is kept operating for the specified time, assuming that the cumulative operation time of each inverter is compared at each specified time.

  Next, the outdoor unit controller 13a starts counting by the longest running time inverter determined time counter (step S34), and compares the cumulative running time of the first inverter 11 with the cumulative running time of the second inverter 12 (Step S35).

  In the case of “(cumulative operating time of first inverter 11) ≧ (cumulative operating time of second inverter 12)” (step S35: Yes), the outdoor unit controller 13a is a second inverter whose cumulative operating time is short. It is decided to operate 12 and to stop the operation of the first inverter 11, and execute the processing of steps S36 to S39. That is, the outdoor unit controller 13a checks whether the second inverter 12 is stopped (step S36), and when the second inverter 12 is stopped (step S36: Yes), the second inverter 12 Is started (step S37), and it is confirmed whether the first inverter 11 is in operation (step S38). In addition, when the second inverter 12 is in operation (Step S36: No), the outdoor unit controller 13a checks whether the first inverter 11 is in operation (Step S38).

  When the first inverter 11 is in operation (step S38: Yes), the outdoor unit controller 13a stops the first inverter 11 (step S39), and ends the process. The outdoor unit control unit 13a ends the process when the first inverter 11 is stopped (step S38: No).

  On the other hand, in the case of “(cumulative operating time of first inverter 11) <(cumulative operating time of second inverter 12)” (step S35: No), the outdoor unit controller 13a determines the cumulative operating time. It is determined that the short first inverter 11 is operated and the operation of the second inverter 12 is stopped, and the processes of steps S40 to S43 are executed. That is, the outdoor unit controller 13a checks whether the first inverter 11 is stopped (step S40), and when the first inverter 11 is stopped (step S40: Yes), the first inverter 11 Is started (step S41), and it is confirmed whether the second inverter 12 is in operation (step S42). In addition, when the first inverter 11 is in operation (Step S40: No), the outdoor unit controller 13a checks whether the second inverter 12 is in operation (Step S42).

  When the second inverter 12 is in operation (step S42: Yes), the outdoor unit controller 13a stops the second inverter 12 (step S43), and ends the process. The outdoor unit controller 13a ends the process when the second inverter 12 is stopped (step S42: No).

  Although FIG. 7 shows an operation example in the case of two inverters, in the case of three or more inverters, the operation may be stopped sequentially from the inverter with the longest cumulative operation time.

  In the case where the longest operation time inverter determination flag is not 0 (the longest operation time inverter determination flag = 1) (step S32: No), the outdoor unit control unit 13a determines that the longest operation time inverter determination time counter is equal to or longer than the prescribed time Is checked (step S44).

  The outdoor unit controller 13a clears the longest operating time inverter determined time counter (step S45) if "(longest operation time inverter determined time counter) ≧ (specified time)" (step S44: Yes), and the longest operating time The inverter determination flag is set to 0 (step S46), and the process ends. When "(longest operation time inverter determined time counter) <(specified time)" (step S44: No), the process ends. The reason for providing these steps S44 to S46 is that if the same condition continues for a long time after starting operation with one inverter, operation will continue with only one inverter, but provision of this process The accumulated operation time can be checked each time the time passes, and the inverter having a long accumulated operation time can be stopped. In general, the air conditioner may operate continuously without stopping the compressor for 24 hours. For example, the specified time is 24 hours. This value is an example, and the prescribed time may be shorter or longer than 24 hours.

  In addition, when the outdoor unit control unit 13a does not satisfy the partial inverter stop condition, that is, when all the inverters are operated (step S31: No), the longest operation time inverter determined time counter is cleared, that is, stopped. The longest operation time inverter determined time counter is set to 0 (step S47). Next, the outdoor unit control unit 13a sets the longest operation time inverter determination flag to 0 (maximum operation time inverter determination time counter = 0) (step S48), and confirms whether or not the first inverter 11 is stopped. (Step S49).

  If the first inverter 11 is stopped (step S49: Yes), the outdoor unit controller 13a starts the operation of the first inverter 11 (step S50), and determines whether the second inverter 12 is stopped. (Step S51). If the first inverter 11 is in operation (No at Step S49), the outdoor unit control unit 13a checks whether the second inverter 12 is at rest (Step S51).

  When the second inverter 12 is stopped (step S51: Yes), the outdoor unit control unit 13a starts the operation of the second inverter 12 (step S52), and ends the process. If the second inverter 12 is in operation (step S51: No), the outdoor unit controller 13a ends the process. Note that FIG. 7 shows an operation example in the case of two inverters, but in the case of three or more inverters, the processing similar to steps S49 to S52 is executed for all inverters, and all are all performed. To operate the inverter.

  Further, FIG. 7 shows an operation example in the case of two inverters, and when one part of the inverter stop condition is satisfied, one inverter having the longest cumulative operation time is stopped, but the inverter Similar control may be performed in the case of three or more. For example, when the air conditioning apparatus includes N inverters (N is an integer of 3 or more) and partially satisfies the inverter stop condition, one to N-1 inverters are sequentially arranged from the inverter with the longest cumulative operation time May be stopped.

  As described above, the refrigeration cycle apparatus 50a of the air conditioner 100a according to the present embodiment operates only a part of the inverters according to the load of the refrigeration cycle circuit, specifically, in the case of light load. , To stop the remaining inverter. Further, the inverter to be operated is determined based on the cumulative operating time of each inverter, specifically, it is decided to operate the inverter having a short cumulative operating time. As a result, the same effect as that of the refrigeration cycle apparatus 50 according to the first embodiment can be obtained, the lifetime of the device can be extended, and improvement in reliability and reduction in cost can be realized.

  Here, hardware configurations of the outdoor unit control unit 13 described in the first embodiment and the outdoor unit control unit 13a described in the second embodiment will be described. FIG. 8 is a diagram showing an example of the hardware configuration of the outdoor unit controller 13 and the outdoor unit controller 13a. The outdoor unit controller 13 and the outdoor unit controller 13a can be realized by the control circuit 200 shown in FIG. 8, that is, the processor 201 and the memory 202. The processor 201 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, also referred to as a DSP), a system LSI (Large Scale Integration), or the like. The memory 202 is a nonvolatile or volatile semiconductor such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), and an electrically erasable programmable read only memory (EEPROM). Memory, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disc), and the like.

  The outdoor unit control unit 13 and the outdoor unit control unit 13a are realized by the processor 201 reading and executing a program stored in the memory 202 for operating as the outdoor unit control unit 13 or the outdoor unit control unit 13a. Be done. The memory 202 is also used as a temporary memory when the processor 201 executes various processes. Also, the memory 202 implements the storage unit 21.

  In addition, the outdoor unit controller 13, the outdoor unit controller 13a, and the storage unit 21 may be realized by dedicated hardware. FIG. 9 is a diagram showing an example of a hardware configuration when the outdoor unit controller 13, the outdoor unit controller 13a, and the storage unit 21 are realized by dedicated hardware. The processing circuit 203 illustrated in FIG. 9 is dedicated hardware that implements the same function as the processor 201 and the memory 202 illustrated in FIG. 8. The processing circuit 203 is, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a combination thereof. .

  The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

  DESCRIPTION OF SYMBOLS 1 compressor, 2 duplex 3 phase motor, 3 1st coil part, 4 2nd coil part, 5 electronic expansion valve, 6 outdoor heat exchanger, 7 indoor heat exchanger, 8 four-way valve, 9 outdoor fan, Reference Signs List 10 indoor fan, 11 first inverter, 12 second inverter, 13, 13a outdoor unit control unit 14, 14a outdoor control board, 15, 15a outdoor unit, 16 indoor unit, 17 indoor control board, 18 indoor unit control Unit, 19 controller, 20 counter unit, 21 storage unit, 50, 50a refrigeration cycle device, 100, 100a air conditioner.

In order to solve the problems described above and to achieve the object, a refrigeration cycle apparatus according to the present invention includes a compressor including a three-phase motor having a first number of winding portions that is an integer of 2 or more. A cycle circuit and a second number of inverters connected one-to-one with any one of the first number of winding parts. The winding portion has three windings corresponding to each of the three phases, and the first number and the second number are the same, and when performing air conditioning with a capacity equal to or less than the median rated capacity , the third The operation of the number of inverters is stopped, the operation of the inverter not composed of the wide band gap semiconductor is stopped, and the operation of the inverter composed of the wide band gap semiconductor is continued .

Claims (9)

A refrigeration cycle circuit including a compressor provided with a three-phase motor having a first number of windings that is an integer greater than or equal to 2;
A second number of inverters connected one-to-one with any one of the first number of windings;
Equipped with
The winding part comprises three windings corresponding to each of three phases,
The first number and the second number are the same,
The refrigeration cycle circuit adjusts the temperature of the object, and when the absolute value of the difference between the temperature of the object and the target temperature is equal to or less than a threshold, the operation of a third number of the inverters is stopped.
The third number is one or more and less than the second number.
Refrigeration cycle equipment. The accumulated operation time of the inverter is calculated for each inverter, and the inverter to be stopped is determined based on the accumulated operation time of each inverter.
The refrigeration cycle apparatus according to claim 1. At least one of the inverters is configured of a wide band gap semiconductor,
The refrigeration cycle apparatus according to claim 1. Each of the inverters is comprised of a wide band gap semiconductor,
The refrigeration cycle apparatus according to claim 2.   An air conditioner comprising the refrigeration cycle apparatus according to any one of claims 1 to 4. A refrigeration cycle circuit including a compressor provided with a three-phase motor having a first number of windings that is an integer greater than or equal to 2;
A second number of inverters connected one-to-one with any one of the first number of windings;
An air conditioner provided with
The winding part comprises three windings corresponding to each of three phases,
The first number and the second number are the same,
When air conditioning is performed at a capacity equal to or less than the rated capacity, the operation of the third number of the inverters is stopped,
The third number is one or more and less than the second number.
Air conditioner. A refrigeration cycle circuit including a compressor provided with a three-phase motor having a first number of windings that is an integer greater than or equal to 2;
A second number of inverters connected one-to-one with any one of the first number of windings;
An air conditioner provided with
The winding part comprises three windings corresponding to each of three phases,
The first number and the second number are the same,
When air conditioning is performed in the energy saving mode in which energy saving performance is prioritized over air conditioning comfort, the operation of the third number of the inverters is stopped,
The third number is one or more and less than the second number.
Air conditioner. The accumulated operation time of the inverter is calculated for each inverter, and the inverter to be stopped is determined based on the accumulated operation time of each inverter.
The air conditioner according to claim 6 or 7.   The heat pump cold / hot water generating apparatus provided with the refrigerating-cycle apparatus as described in any one of Claims 1-4.

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