GB2605711A

GB2605711A - Air conditioner

Info

Publication number: GB2605711A
Application number: GB2207532.9A
Authority: GB
Inventors: Tanaka Hideyasu
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2022-10-12
Anticipated expiration: 2040-01-08
Also published as: GB2605711B; WO2021140582A1; GB202207532D0; JP7258186B2; JPWO2021140582A1

Abstract

This air conditioner comprises: a blower that has a motor and sends air to a space to be air-conditioned by driving the motor; a peripheral component that is disposed around the blower; and a control device that controls the rotational speed of the motor. When the motor rotational speed is at a preset rotational speed and the motor and the peripheral component are resonating, the control device sets the frequency corresponding to the preset rotational speed as a skip frequency which prevents the motor from being driven at a specific rotational speed.

Description

DESCRIPTION Title of Invention

AIR-CONDITIONER

Technical Field

[0001] The present disclosure relates to an air-conditioning apparatus provided with a fan configured to send air to an air-conditioning target space.

Background Art

[0002] When power is supplied to a direct current (DC) fan motor used in an air-conditioning apparatus or other devices, the frequency of motor electromagnetic vibration of the motor body and the natural frequency of a peripheral component in contact with the motor, such as a propeller or a fan bracket, may overlap each other, and thereby may cause a resonance phenomenon. When such a resonance phenomenon is occurring, an electromagnetic sound may be generated which could cause a noise problem.

[0003] As a conventional structural method for preventing electromagnetic sound, there has been proposed and implemented a method in which a vibration-proof material or a similar material is inserted between a motor and a peripheral component in contact with the motor to suppress the transmission of electromagnetic vibration of the motor to the peripheral component. Furthermore, as another technique for electromagnetic sound prevention, Patent Literature 1, for example, discloses an air-conditioning apparatus in which a plurality of radial ribs extending in a radial direction around the rotation axis of a fan motor are provided to effectively reduce electromagnetic sound that diffuses concentrically.

[0004] Meanwhile, as a regulative method for preventing electromagnetic sound, there has been proposed a method in which when, for example, a device is manufactured, a resonance point at which a resonance phenomenon is occurring is identified in advance in an electromagnetic sound occurrence range, which is defined by the upper limit value and the lower limit value of the rotation speed of a motor, and the motor is controlled not to be driven at the rotation speed of the resonance point.

Citation List Patent Literature [0005] Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2010-085048

Summary of Invention

Technical Problem [0006] In a duct connection type air conditioning apparatus in which a duct for supplying air to an air-conditioning target space is connected to a fan, resonance occurs at an unexpected rotation speed depending on the installation place or a construction condition at the installation site, often causing problems such as vibration and noise. However, in a conventional air-conditioning apparatus, a resonance point has been set before installation construction, and resonance generated after installation is not taken into consideration. Consequently, it is difficult to appropriately suppress the resonance.

[0007] The present disclosure has been made to solve the problems of the abovementioned conventional techniques, and an object of the present disclosure is to provide an air-conditioning apparatus capable of appropriately suppressing resonance. Solution to Problem [0008] An air-conditioning apparatus according to an embodiment of the present disclosure includes a fan having a motor and configured to send air to an air-conditioning target space by driving the motor, a peripheral component arranged around the fan, and a controller configured to control a rotation speed of the motor. When the rotation speed of the motor is a preset rotation speed and the motor resonates with the peripheral component, the controller sets a frequency corresponding to the preset rotation speed as a skip frequency, which is set to prevent the motor from being driven at a specific rotation speed.

Advantageous Effects of Invention [0009] According to the air-conditioning apparatus according to an embodiment of the present disclosure, when a motor of a fan resonates with a peripheral component arranged around the fan while rotating at a preset rotation speed, the frequency corresponding to the preset rotation speed is set as a skip frequency. As a result, resonance can be suppressed appropriately even after the air-conditioning apparatus is installed.

Brief Description of Drawings

[0010] [Fig. 1] Fig. 1 is a hardware configuration diagram illustrating an example of the configuration of an air-conditioning apparatus according to Embodiment 1.

[Fig. 2] Fig. 2 is a circuit diagram illustrating an example of the configuration of a power converter of Fig. 1.

[Fig. 3] Fig. 3 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 1.

[Fig. 4] Fig. 4 is a hardware configuration diagram illustrating an example of the configuration of the controller of Fig. 3.

[Fig. 5] Fig. 5 is a hardware configuration diagram illustrating another example of the configuration of the controller of Fig. 3.

[Fig. 6] Fig. 6 is a schematic view illustrating an example of the range of rotation speed of an indoor fan.

[Fig. 7] Fig. 7 is a flowchart illustrating an example of the flow of skip frequency setting processing of the air-conditioning apparatus according to Embodiment 1.

[Fig. 8] Fig. 8 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 2.

[Fig. 9] Fig. 9 is a flowchart illustrating an example of the flow of skip frequency setting processing of an air-conditioning apparatus according to Embodiment 2.

[Fig. 10] Fig. 10 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 3.

[Fig. 11] Fig. 11 is a flowchart illustrating an example of the flow of skip frequency setting processing of an air-conditioning apparatus according to Embodiment 3.

[Fig. 12] Fig. 12 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 4.

[Fig. 13] Fig. 13 is a flowchart illustrating an example of the flow of skip frequency setting processing of an air-conditioning apparatus according to Embodiment 4.

Description of Embodiments

[0011] Embodiments according to the present disclosure will be described below with reference to the drawings. The present disclosure is not limited by the embodiments described below, and various modifications can be made without departing the spirit of the present disclosure. Furthermore, the present disclosure includes every possible combination of the components shown in the embodiments below. Moreover, in each of the drawings, the shapes, sizes, and arrangement of the components can be changed, as appropriate, within the scope of the present disclosure. In addition, in the drawings, components denoted by the same reference signs are the same or corresponding components, and this applies to the entire description.

[0012] Embodiment 1 An air-conditioning apparatus according to Embodiment 1 will be described. The air-conditioning apparatus according to Embodiment 1, the air-conditioning apparatus, is configured to perform air-conditioning in an air-conditioning target space by causing refrigerant to circulate in a refrigerant circuit. [0013] Configuration of Air-conditioning Apparatus 1 Fig. 1 is a hardware configuration diagram illustrating an example of the configuration of the air-conditioning apparatus according to Embodiment 1. As shown in Fig. 1, an air-conditioning apparatus 1 includes a compressor 2, a refrigerant flow switching device 3, an outdoor heat exchanger 4, an outdoor fan 5, an expansion valve 6, an indoor heat exchanger 7, and an indoor fan 8. In the air-conditioning apparatus 1, the compressor 2, the refrigerant flow switching device 3, the outdoor heat exchanger 4, the expansion valve 6, and the indoor heat exchanger 7 are sequentially connected by a refrigerant pipe to form a refrigerant circuit through which refrigerant circulates.

[0014] The compressor 2 is configured to suck and compress refrigerant in a low-temperature, low-pressure state and then discharge the refrigerant in a high-temperature, high-pressure state. The compressor 2 is an inverter compressor in which the capacity, which is the sending amount per unit time, is controlled by changing an operation frequency. The operation frequency of the compressor 2 is controlled by a controller 20, which will be described later.

[0015] The refrigerant flow switching device 3 is, for example, a four-way valve and is configured to switch flow directions of the refrigerant to switch between a cooling operation and a heating operation. During a cooling operation, the refrigerant flow switching device 3 is switched into a state indicated by the solid lines in Fig. 1, that is, a state in which a discharge side of the compressor 2 and the outdoor heat exchanger 4 are connected to each other. In addition, during a heating operation, the refrigerant flow switching device 3 is switched into a state indicated by the broken lines in Fig. 1, that is, a state in which a suction side of the compressor 2 and the outdoor heat exchanger 4 are connected to each other. The switching of flow passages by the refrigerant flow switching device 3 is controlled by the controller 20.

[0016] The outdoor heat exchanger 4 is, for example, a fin-and-tube heat exchanger and is configured to exchange heat between an outdoor air supplied by the outdoor fan 5 and the refrigerant. During a cooling operation, the outdoor heat exchanger 4 functions as a condenser that condenses the refrigerant by rejecting heat of the refrigerant to the outdoor air. In addition, during a heating operation, the outdoor heat exchanger 4 functions as an evaporator that evaporates the refrigerant and cools the outdoor air by the heat of the evaporation.

[0017] The outdoor fan 5 is driven by a motor (not shown) and is configured to supply an outdoor air to the outdoor heat exchanger 4. The rotation speed of the outdoor fan 5 is controlled by the controller 20. The sending amount of air to the outdoor heat exchanger 4 is adjusted by controlling the rotation speed.

[0018] The expansion valve 6 is configured to decompress and thereby expand the refrigerant. The expansion valve 6 is, for example, an electronic expansion valve whose opening degree can be controlled. The opening degree of the expansion valve 6 is controlled by the controller 20.

[0019] The indoor heat exchanger 7 is configured to exchange heat between an indoor air supplied by the indoor fan 8 and the refrigerant. Through this heat exchange, air for cooling or air for heating to be supplied to an indoor space is generated. The indoor heat exchanger 7 functions as an evaporator during a cooling operation and performs cooling by cooling the air in an air-conditioning target space. In addition, the indoor heat exchanger 7 functions as a condenser during a heating operation and performs heating by heating the air in the air-conditioning target space.

[0020] The indoor fan 8 is driven by a motor M and is configured to supply air to the indoor heat exchanger 7. The rotation speed of the indoor fan 8 is controlled by the controller 20. The sending amount of air to the indoor heat exchanger 7 is adjusted by controlling the rotation speed.

[0021] The indoor fan 8 includes an air-sending element 8a configured to send air and the motor M connected to the air-sending element 8a. The air-sending element 8a is a propeller or a similar device configured to send air. The motor M is configured to operate as a load 50 of a power converter 10, which will be described later, and rotationally drive the air-sending element 8a by using power supplied from the power converter 10.

[0022] In addition, the air-conditioning apparatus 1 includes the power converter 10, the controller 20, and a remote control (hereinafter referred to as a "remote", as appropriate) 30. The remote 30 is connected to the controller 20.

[0023] Power Converter 10 The power converter 10 is configured to convert power supplied from an alternating-current (AC) power source 9 and supply the converted power to the motor M, being as the load 50, of the indoor fan 8 to rotationally drive the motor M. [0024] Fig. 2 is a circuit diagram illustrating an example of the configuration of the power converter of Fig. 1. As shown in Fig. 2, the AC power source 9, such as a three-phase AC power source, and the indoor fan 8 having the motor M, which is the load 50, are connected to the power converter 10. The power converter 10 includes a rectifier 11, a smoothing circuit 12, an inverter circuit 13, and a current detector 14.

[0025] The rectifier 11 is an alternating current to direct current (AC-to-DC) converter. The rectifier 11 is connected to the AC power source 9 and is configured to rectify and convert an AC voltage, such as AC 200V or AC 400V, supplied from the AC power source 9 into a DC voltage. The rectifier 11 is, for example, a three-phase full-wave rectifier in which a plurality of diodes are connected in a bridge configuration.

[0026] The smoothing circuit 12 includes, for example, a rectifier and a smoothing capacitor. The smoothing circuit 12 is configured to smooth and charge the voltage rectified by the rectifier 11.

[0027] The inverter circuit 13 includes, for example, a plurality of switching elements and is configured to convert the DC voltage smoothed and charged by the smoothing capacitor of the smoothing circuit 12 into an AC voltage. The load 50, such as the motor M of the indoor fan 8, is connected to the inverter circuit 13. The inverter circuit 13 supplies the converted AC voltage to the load 50.

[0028] The inverter circuit 13 is configured to output an AC voltage, which is a pulse width modulation (PWM) voltage, when the plurality of switching elements are controlled by the controller 20. The switching elements of the inverter circuit 13 perform ON and OFF operations based on switching signals supplied from the controller 20.

[0029] The current detector 14 is configured to detect a load current that is output from the inverter circuit 13 and supplied to the load 50. The current detector 14 may detect all of the three phases supplied to the load 50, or may detect two out of the three phases and calculate the remaining one phase by using Kirchhoff's law.

[0030] A duct 40 is attached to the indoor fan 8 to supply air sent from the indoor fan 8 to an air-conditioning target space. The duct 40 is one example of peripheral components provided near the indoor fan 8. In addition, the indoor fan 8 is provided with a rotation speed detector 15. Furthermore, a vibration detector 16 is installed near the duct 40.

[0031] The rotation speed detector 15 is configured to detect the rotation speed of the motor M driven according to the load current, that is, the rotation speed of the indoor fan 8. The vibration detector 16 is configured to detect vibration of the indoor fan 8 or vibration of the duct 40 attached to the indoor fan 8.

[0032] Remote 30 The remote 30 is operated by a user and performs settings of an operation mode, an air-conditioning temperature, and other operations. In particular, in Embodiment 1, when the rotation speed of the indoor fan 8 is controlled, the remote 30 can set a skip frequency so that driving at a specific rotation speed is prevented to suppress a resonance. The skip frequency is a frequency that coincides with a resonance frequency among driving frequencies of the motor M, the driving frequencies corresponding to the rotation speeds of the indoor fan 8, and at which continuous driving of the indoor fan 8 is avoided.

[0033] The remote 30 is provided with a communication unit (not shown) configured to perform wireless or wired communication. Transmission and reception of various kinds of information, such as skip frequency information including a skip frequency being set, are performed between the remote 30 and the controller 20. In addition, the remote 30 includes a notification unit (not shown), such as a display device or a voice output device. Various information can be notified to a user by the notification unit.

[0034] Controller 20 The controller 20 is configured to control each unit provided in the air-conditioning apparatus 1. For example, the controller 20 controls the inverter circuit 13 based on a load current detected by the current detector 14. In addition, in Embodiment 1, the controller 20 performs skip frequency setting processing, which will be described later, and controls the rotation speed of the indoor fan 8 based on a result of determination on the presence or absence of a resonance phenomenon.

[0035] Fig. 3 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 1. As shown in Fig. 3, the controller 20 includes an information acquisition unit 21, a skip frequency setting unit 22, an inverter control unit 23, and a storage unit 24. The controller 20 is an arithmetic device, such as a microcomputer that achieves each function by executing software, or hardware, such as a circuit device corresponding to each function. Note that, in Fig. 3, only configuration for the functions related to Embodiment 1 is illustrated and illustration of other configurations is omitted.

[0036] The information acquisition unit 21 is configured to receive setting information transmitted from the remote 30. The skip frequency setting unit 22 is configured to set a skip frequency based on the setting information acquired by the information acquisition unit 21 and a skip frequency setting table stored in the storage unit 24. The inverter control unit 23 is configured to generate switching signals for operating the respective switching elements of the inverter circuit 13, based on the load current detected by the current detector 14.

[0037] The storage unit 24 stores various information to be used in each unit of the controller 20. In Embodiment 1, the storage unit 24 stores a skip frequency setting table to which the skip frequency setting unit 22 refers when determining a skip frequency. In addition, the storage unit 24 stores a skip frequency that is acquired by the information acquisition unit 21 and set by the skip frequency setting unit 22.

[0038] Fig. 4 is a hardware configuration diagram illustrating an example of the configuration of the controller of Fig. 3. When various functions of the controller 20 are executed by hardware, the controller 20 of Fig. 3 is a processing circuit 35, as shown in Fig. 4. In the controller 20 of Fig. 3, each function of the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24 is achieved by the processing circuit 35.

[0039] When each of the functions is executed by hardware, the processing circuit 35 corresponds to, for example, a single circuit, a composite circuit, a programmed processor, a parallel-programmed processor, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination thereof. In the controller 20, the functions of the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24 may be implemented by respective processing circuits 35, or may be implemented by a single processing circuit 35.

[0040] Fig. 5 is a hardware configuration diagram illustrating another example of the configuration of the controller of Fig. 3. When various functions of the controller 20 are executed by software, the controller 20 of Fig. 3 is made up of a processor 36 and a memory 37, as shown in Fig. 5. In the controller 20, each function of the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24 is achieved by the processor 36 and the memory 37.

[0041] When each of the functions is executed by software, the functions of the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24 in the controller 20 are achieved by software, firmware, or a combination thereof. The software and the firmware are described as programs and are stored in the memory 37. The processor 36 is configured to read out and execute the programs stored in the memory 37, to thereby achieve the functions of the units.

[0042] A non-volatile or volatile semiconductor memory, such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable and programmable ROM (EPROM), or an electrically erasable and programmable ROM (EEPROM), is used as the memory 37, for example. Furthermore, a detachable recording medium, such as a magnetic disk, a flexible disk, an optical disc, a compact disc (CD), a mini disc (MD) or a digital versatile disc (DVD), may be used as the memory 37, for example.

[0043] Operations of Air-conditioning Apparatus 1 Next, with reference to Fig. 1, operations of the air-conditioning apparatus 1 having the abovementioned configuration will be described together with a flow of the refrigerant. In the description below, the flow of the refrigerant when the air-conditioning apparatus 1 performs a cooling operation will be explained as one example.

[0044] When the air-conditioning apparatus 1 performs a cooling operation, the refrigerant flow switching device 3 is switched first, by control of the controller 20, to a state indicated by the solid lines of Fig. 1. That is, the refrigerant flow switching device 3 is switched to a state where a discharge side of the compressor 2 and the outdoor heat exchanger 4 are connected each other and a suction side of the compressor 2 and the indoor heat exchanger 7 are connected each other.

[0045] When the compressor 2 is driven, refrigerant in a high-temperature, high-pressure gas state is discharged from the compressor 2. The refrigerant in the high-temperature, high-pressure gas state discharged from the compressor 2 flows into the outdoor heat exchanger 4 functioning as a condenser via the refrigerant flow switching device 3. In the outdoor heat exchanger 4, heat is exchanged between the refrigerant in the high-temperature, high-pressure gas state having flowed therein and an outdoor air supplied by the outdoor fan 5. As a result, the refrigerant in the high-temperature, high-pressure gas state is condensed, and enters a high-pressure liquid state.

[0046] The refrigerant in the high-pressure liquid state having flowed out from the outdoor heat exchanger 4 is expanded by the expansion valve 6, and enters a two-phase state in which the refrigerant in a low-pressure gas state and the refrigerant in a low-pressure liquid state are mixed. The refrigerant in the two-phase state flows into the indoor heat exchanger 7 functioning as an evaporator.

[0047] In the indoor heat exchanger 7, heat is exchanged between the refrigerant in the two-phase state having flowed therein and an indoor air supplied by the indoor fan 8.

During the exchange of heat, the motor M is rotationally driven by a load current supplied from the power converter 10, the air-sending element 8a connected to the motor M thus operates at a rotation speed corresponding to the magnitude of the load current, and therefore the indoor fan 8 sends an indoor air to the indoor heat exchanger 7. Consequently, the refrigerant in a liquid state of the refrigerant in the two-phase state is evaporated, and enters a low-pressure gas state.

[0048] Next, the refrigerant in the low-pressure gas state having flowed out from the indoor heat exchanger 7 flows into the compressor 2 via the refrigerant flow switching device 3 and is compressed therein. The refrigerant thus enters a high-temperature, high-pressure gas state and is discharged from the compressor 2 again. After that, this cycle is repeated.

[0049] Setting of Skip Frequency Next, setting of a skip frequency by the air-conditioning apparatus 1 will be described. In general, in a case where a peripheral component, such as a duct, is connected to a variable air volume fan, when the rotation speed of the fan coincides with a resonance frequency of the system, vibration and noise may be generated due to a resonance phenomenon, and the vibration may damage an air-conditioning apparatus. For this reason, to prevent the fan from operating at the rotation speed corresponding to a frequency that coincides with a resonance frequency, a skip frequency is usually set to avoid the frequency.

[0050] A skip frequency is set during manufacturing of the air-conditioning apparatus by determining a resonance frequency by operating a fan while sequentially changing the frequency of the fan. However, a resonance frequency of a structure system involving the fan cannot be determined until the whole facility including a duct attached to the fan or a peripheral component, such as a floor or a ceiling, on which the apparatus including the fan is installed is considered. Because the presence or absence of a resonance point at which a resonance phenomenon is occurring cannot be determined until installation construction of the air-conditioning apparatus and its peripheral construction are completed, setting of a skip frequency needs to be performed after the air-conditioning apparatus is installed.

[0051] Thus, the air-conditioning apparatus 1 according to Embodiment 1 performs skip frequency setting processing to set a skip frequency, in a state where the air-conditioning apparatus 1 is installed. More specifically, in the air-conditioning apparatus 1, whether or not a resonance phenomenon is occurring is determined for each rotation speed while changing the rotation speed of the indoor fan 8 in a state where the air-conditioning apparatus 1 is installed. Then, a driving frequency of the motor M, the driving frequency corresponding to the rotation speed at which occurrence of a resonance phenomenon is determined is set as a skip frequency.

[0052] In this case, for each type of fan, a range of driving rotation speed at which the fan can be driven is set in advance. When the fan is actually driven, the upper limit and the lower limit of allowable rotation speed are set within the preset range of driving rotation speed based on the actual usage environment and conditions. This is because a range (width) of rotation speed that can be actually used is predefined for the preset range of driving rotation speed.

[0053] Fig. 6 is a schematic view illustrating an example of the range of rotation speed of an indoor fan. As described above, for the indoor fan 8, a range of driving rotation speed at which the indoor fan Scan be driven is set in advance. Fig. 6 shows a case where a range from 420 revolutions per minute (rpm) to 1380 rpm is set as the driving rotation speed range. In addition, as described above, for the indoor fan 8, an allowable rotation speed range is set within the driving rotation speed range, based on the lower and upper limits of usable rotation speed. Fig. 6 shows a case where a range from 570 rpm to 1140 rpm is set as the allowable rotation speed range.

[0054] While sequentially changing the rotation speed of the indoor fan 8 as shown in Fig. 6, whether or not a resonance phenomenon is occurring is determined for each rotation speed. When a resonance phenomenon is occurring at a certain rotation speed, the driving frequency of the motor M corresponding to this rotation speed is set as a skip frequency. When the skip frequency is set, the indoor fan 8 is set so that the indoor fan 8 is prevented from being driven at a frequency in a certain range (for example, a range of about plus/minus 10 rpm) with the set skip frequency as a center value. More specifically, in the example shown in Fig. 6, when, for example, the driving frequency corresponding to a rotation speed of 1020 rpm is set as a skip frequency, the indoor fan 8 is driven at any frequency while skipping a frequency corresponding to a rotation speed in a range from 1010 rpm to 1030 rpm.

[0055] Note that, when a skip frequency is set, constant driving of the indoor fan 8 at the set skip frequency is not performed. However, an instantaneous driving of the indoor fan 8 at the skip frequency may be performed in some cases. For example, in a case where the driving frequency corresponding to a rotation speed of 1020 rpm is set as a skip frequency, when the rotation speed is changed from 900 rpm to 1110 rpm, the rotation speed of the indoor fan 8 is gradually changed. Therefore, the motor M of the indoor fan 8 will be driven at a rotation speed of 1010 rpm to 1030 rpm for a brief moment. However, in this case, because driving of the motor M at the skip frequency continues for only a short time, a problem involving a resonance phenomenon does not occur.

[0056] Setting of Skip Frequency by Remote 30 In Embodiment 1, when it is determined that a resonance phenomenon is occurring, setting information for setting a skip frequency to the remote 30 is input by a user. The skip frequency is set based on the input setting information.

[0057] As setting information in the example shown in Fig. 6, two device setting numbers (device setting Nos.) are associated with each rotation speed, for example. In this example, one of the values from 1 to 10 is set for each of the two device setting numbers. Because each rotation speed and the corresponding combination of the two device setting numbers are uniquely associated with each other, the rotation speed can be uniquely determined from the combination of the two device setting numbers.

[0058] In this case, to set a skip frequency, a user inputs setting information including two device setting numbers with the remote 30. When the setting information is input, the remote 30 transmits the input setting information to the controller 20. The controller 20 receives the setting information transmitted from the remote 30 via the information acquisition unit 21. Then, the skip frequency setting unit 22 of the controller 20 sets a skip frequency based on the received setting information.

[0059] At that time, a correspondence relation shown in Fig. 6 between the rotation speed and the setting information including the two device setting numbers has been stored as a skip frequency setting table in the storage unit 24 of the controller 20. Thus, the skip frequency setting unit 22 refers to the skip frequency setting table based on the received setting information to determine the rotation speed of the indoor fan 8. Then, the skip frequency setting unit 22 sets a driving frequency of the motor M corresponding to the determined rotation speed as a skip frequency.

[0060] Note that, in Embodiment 1, a plurality of skip frequencies can be set by inputting setting information to the remote 30 a plurality of times. Furthermore, although this example describes a case where two device setting numbers are used as setting information, the setting information is not limited thereto. Each piece of setting information may include one device setting number or three or more device setting numbers.

[0061] Skip Frequency Setting Processing Fig. 7 is a flowchart illustrating an example of the flow of the skip frequency setting processing of the air-conditioning apparatus according to Embodiment 1. In the skip frequency setting processing of Embodiment 1, whether or not a resonance phenomenon is occurring is determined by a user.

[0062] In step Si, an air-sending operation of the air-conditioning apparatus 1 is started. The controller 20 sets the operation mode to an air-sending operation and causes the air-conditioning apparatus 1 to start the operation.

[0063] In step 52, the rotation speed of the indoor fan 8 is set. The inverter control unit 23 of the controller 20 generates switching signals that cause the indoor fan 8 to drive at a set rotation frequency and supplies the signals to the inverter circuit 13 of the power converter 10. Consequently, a load current corresponding to the preset rotation speed is output from the power converter 10 and supplied to the indoor fan 8. Note that the set rotation frequency is a value included in the preset rotation speed range, which is defined by the lower and upper limit values of the usable rotation speed of the motor M of the indoor fan 8. In step S2, the preset rotation speed to be set first is the lower limit value of the rotation speed, for example.

[0064] In step S3, whether or not a resonance phenomenon is occurring at the current rotation speed of the indoor fan 8 is determined. In Embodiment 1, a user determines whether or not a resonance phenomenon is occurring. For example, based on vibration or noise, the user visually or acoustically determines whether or not a resonance phenomenon is occurring.

[0065] When it is determined that a resonance phenomenon is occurring (YES in step S3), the driving frequency of the motor M corresponding to the current rotation speed of the indoor fan 8 is set as a skip frequency in step S4. The setting of the skip frequency is performed based on setting information that the user inputs by operating the remote 30.

[0066] When the setting information is input to the remote 30, the remote 30 transmits the input setting information to the controller 20. Based on the setting information received via the information acquisition unit 21, the skip frequency setting unit 22 determines the rotation speed of the indoor fan 8 by referring to the skip frequency setting table stored in the storage unit 24, and sets the driving frequency corresponding to this rotation speed as a skip frequency. Then, the skip frequency setting unit 22 stores skip frequency information in the storage unit 24 and sets the skip frequency based on the skip frequency information.

[0067] Meanwhile, when it is determined that no resonance phenomenon occurs in step 53 (NO in step S3), the processing proceeds to step 55.

[0068] In step S5, whether or not the skip frequency setting processing has been performed for all of the rotation speeds of the indoor fan 8 is determined. When it is determined that the skip frequency setting processing has been performed for all of the rotation speeds (YES in step S5), the series of processing is ended.

[0069] Furthermore, when it is determined that the skip frequency setting processing has not yet been performed for all of the rotation speeds (NO in step S5), the processing returns to step 32. At that time, in step 32, the inverter control unit 23 sets the rotation speed of the indoor fan 8 to a value different from the previous values. Then, with the changed rotation speed of the indoor fan 8, the processing of steps 33 and S4 is performed.

[0070] In this way, in Embodiment 1, while sequentially changing the rotation speed, the skip frequency setting processing is performed repeatedly for all of the rotation speeds in the preset rotation speed range. Then, after all skip frequencies in the preset rotation speed range are set, the inverter control unit 23 generates switching signals so that the motor M is not driven at the rotation speeds corresponding to the set skip frequencies in the subsequent operation.

[0071] Note that, after the skip frequencies are set as described above, when the indoor fan 8 needs to be driven at a rotation speed corresponding to one of the skip frequencies, the indoor fan 8 is made to drive at a frequency of plus/minus several cycles per second (hertz) of the skip frequency, for example.

[0072] As described above, in the air-conditioning apparatus 1 according to Embodiment 1, under a state where the duct 40 is attached to the indoor fan 8 and the motor M of the indoor fan 8 is driven at a preset rotation speed, when the motor M resonates with the duct 40, a frequency corresponding to the preset rotation speed is set as a skip frequency. With this configuration, even after the air-conditioning apparatus 1 is installed, a skip frequency can be set at the installation site, and thus occurrence of resonance can be appropriately prevented.

[0073] Note that, although Embodiment 1 indicates that setting information is input in the remote 30 and the controller 20 determines a skip frequency based on the input setting information, the way of acquiring a skip frequency is not limited thereto. A skip frequency may be directly input to the remote 30.

[0074] Furthermore, in Embodiment 1, a case where a skip frequency is set for the indoor fan 8 of the air-conditioning apparatus 1 is described. However, the configuration is not limited thereto, and a skip frequency may be set for, for example, the compressor 2 or the outdoor fan 5. In addition, a target device for which a skip frequency is set is not limited to the air-conditioning apparatus 1, and the target device may be, for example, a heat pump apparatus, a refrigerating apparatus, or any other refrigerating cycle apparatus.

[0075] Embodiment 2 Next, Embodiment 2 will be described. Embodiment 2 differs from Embodiment 1 in that the presence or absence of a resonance phenomenon is determined based on a load current supplied to the motor M. Note that, in Embodiment 2, the components common to Embodiment 1 will be denoted by the same reference signs, and their

descriptions will be omitted.

[0076] In general, the rotation speed of a fan is determined based on a load current supplied to the motor. Thus, when a constant load current is supplied to the motor, the motor is driven at a constant rotation speed. However, when a resonance phenomenon is occurring, the rotation speed of the motor may become unstable and thus the load current may fluctuate. Therefore, in Embodiment 2, a skip frequency is automatically set based on the load current supplied to the motor M. [0077] Configuration of Controller 20 Fig. 8 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 2. As shown in Fig. 8, the controller 20 includes a current comparison unit 125, in addition to the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24.

[0078] The information acquisition unit 21 is configured to acquire a load current supplied to the motor M detected by the current detector 14. In addition, the information acquisition unit 21 is configured to acquire a driving rotation speed of the motor M detected by the rotation speed detector 15 at a time when the load current is detected by the current detector 14.

[0079] The current comparison unit 125 is configured to compare a load current acquired by the information acquisition unit 21 and a current threshold having been stored in advance in the storage unit 24 to determine whether or not a resonance phenomenon is occurring. When the current comparison unit 125 determines that a resonance phenomenon is occurring, the skip frequency setting unit 22 is configured to set, as a skip frequency, a frequency corresponding to the rotation speed of the motor M at the time of acquisition of the load current. The storage unit 24 stores in advance a current threshold to be used by the current comparison unit 125. The current threshold is set to, for example, a load current value that is a reference indicating that no resonance occurs.

[0080] Skip Frequency Setting Processing Fig. 9 is a flowchart illustrating an example of the flow of skip frequency setting processing of the air-conditioning apparatus according to Embodiment 2. In the skip frequency setting processing of Embodiment 2, whether or not a resonance phenomenon is occurring is determined based on the load current supplied to the motor M. [0081] In step S11, an air-sending operation of the air-conditioning apparatus 1 is started. The controller 20 sets the operation mode to an air-sending operation and causes the air-conditioning apparatus 1 to start the operation.

[0082] In step S12, the rotation speed of the indoor fan 81s set. The inverter control unit 23 of the controller 20 generates switching signals that cause the indoor fan 8 to drive at a set rotation frequency and supplies the signals to the inverter circuit 13 of the power converter 10. Consequently, a load current corresponding to the preset rotation speed is output from the power converter 10 and supplied to the indoor fan 8. [0083] In step S13, whether or not a resonance phenomenon is occurring at the current rotation speed of the indoor fan 8 is determined. In Embodiment 2, whether or not a resonance phenomenon is occurring is determined based on the load current detected by the current detector 14. The current comparison unit 125 compares the load current supplied to the motor M of the indoor fan 8 and the current threshold having been stored in advance in the storage unit 24 to determine whether or not a resonance phenomenon is occurring.

[0084] When the load current exceeds the current threshold (YES in step S13), the current comparison unit 125 determines that a resonance phenomenon is occurring. In that case, the skip frequency setting unit 22 sets the driving frequency corresponding to the rotation speed of the motor M at the time of detection of the load current as a skip frequency, and stores the skip frequency in the storage unit 24 in step S14.

[0085] Meanwhile, when the load current is equal to or less than the current threshold (NO in step S13), the current comparison unit 125 determines that no resonance phenomenon occurs, and the processing proceeds to step S15.

[0086] In step S15, whether or not the skip frequency setting processing has been performed for all of the rotation speeds of the indoor fan 8 is determined. When it is determined that the skip frequency setting processing has been performed for all of the rotation speeds (YES in step S15), the series of processing is ended.

[0087] Furthermore, when it is determined that the skip frequency setting processing has not yet been performed for all of the rotation speeds (NO in step S15), the processing returns to step S12. At that time, in step S12, the inverter control unit 23 sets the rotation speed of the indoor fan 8 to a value different from the previous values. Then, with the changed rotation speed of the indoor fan 8, the processing of steps S13 and S14 is performed.

[0088] In this way, in Embodiment 2, while sequentially changing the rotation speed, the skip frequency setting processing is performed repeatedly for all of the rotation speeds in the preset rotation speed range. Then, after all skip frequencies in the preset rotation speed range are set, the inverter control unit 23 generates switching signals so that the motor M is not driven at the rotation speeds corresponding to the set skip frequencies in the subsequent operation.

[0089] Note that, although, in this example, the current comparison unit 125 determines that a resonance phenomenon is occurring when a load current exceeds the current threshold at a certain time, the way of determining whether or not a resonance phenomenon is occurring is not limited to this example. For example, the current comparison unit 125 may determine that a resonance phenomenon is occurring when a state where an instantaneous value of load current exceeds the range of plus/minus 10% of an average value of the load currents within a preset measurement time period having been set in advance, appears repeatedly for a preset number of times or more. In addition, the range of "plus/minus 10%" as a determination value for this case is given as an example, and the determination value is not limited thereto.

[0090] As described above, in the air-conditioning apparatus 1 according to Embodiment 2, whether or not a resonance phenomenon between the motor M and the duct 40 occurs is determined based on the load current detected by the current detector 14. At that time, the controller 20 determines that a resonance phenomenon is occurring when the load current exceeds the current threshold. Alternatively, the controller 20 determines that a resonance phenomenon is occurring when a state where an instantaneous value of load current exceeds the preset range of the average value of the load currents within a preset measurement time period, appears repeatedly for a preset number of times or more. With this configuration, even after the air-conditioning apparatus 1 is installed, a skip frequency can be automatically set at the installation site, and thus occurrence of resonance can be appropriately prevented.

[0091] Embodiment 3 Next, Embodiment 3 will be described. Embodiment 3 differs from Embodiments 1 and 2 in that the presence or absence of a resonance phenomenon is determined based on the vibration during operation of the indoor fan 8. Note that, in Embodiment 3, the components common to Embodiments 1 and 2 will be denoted by the same reference signs, and their descriptions will be omitted.

[0092] In general, when a resonance phenomenon is occurring, vibration is increased compared with a case when no resonance phenomenon occurs. Therefore, in Embodiment 3, a skip frequency is automatically set based on the vibration during operation of the indoor fan 8.

[0093] Configuration of Controller 20 Fig. 10 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 3. As shown in Fig. 10, the controller 20 includes a vibration comparison unit 225, in addition to the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24.

[0094] The information acquisition unit 21 is configured to acquire information on vibration of the duct 40 detected by the vibration detector 16. In addition, the information acquisition unit 21 is configured to acquire a driving rotation speed of the motor M detected by the rotation speed detector 15 at a time when the vibration information is detected by the vibration detector 16.

[0095] The vibration comparison unit 225 is configured to compare vibration information acquired by the information acquisition unit 21 and a vibration threshold having been stored in advance in the storage unit 24 to determine whether or not a resonance phenomenon is occurring. When the vibration comparison unit 225 determines that a resonance phenomenon is occurring, the skip frequency setting unit 22 is configured to set, as a skip frequency, a driving frequency corresponding to the rotation speed of the motor M at the time of acquisition of the vibration information. The storage unit 24 stores in advance a vibration threshold to be used by the vibration comparison unit 225.

The vibration threshold is set to, for example, a vibration value that is a reference indicating that no resonance occurs.

[0096] Skip Frequency Setting Processing Fig. 11 is a flowchart illustrating an example of the flow of skip frequency setting processing of an air-conditioning apparatus according to Embodiment 3. In the skip frequency setting processing of Embodiment 3, whether or not a resonance phenomenon is occurring is determined based on vibration of the duct 40 attached to the indoor fan 8.

[0097] In step S21, an air-sending operation of the air-conditioning apparatus 1 is started. The controller 20 sets the operation mode to an air-sending operation and causes the air-conditioning apparatus 1 to start the operation.

[0098] In step S22, the rotation speed of the indoor fan 8 is set. The inverter control unit 23 of the controller 20 generates switching signals that cause the indoor fan 8 to drive at a set rotation frequency and supplies the signals to the inverter circuit 13 of the power converter 10. Consequently, a load current corresponding to the preset rotation speed is output from the power converter 10 and supplied to the indoor fan 8. [0099] In step S23, whether or not a resonance phenomenon is occurring at the current rotation speed of the indoor fan 8 is determined. In Embodiment 3, whether or not a resonance phenomenon is occurring is determined based on the vibration information detected by the vibration detector 16. The vibration comparison unit 225 compares the vibration information of the duct 40 attached to the indoor fan 8 and the vibration threshold having been stored in advance in the storage unit 24 to determine whether or not a resonance phenomenon is occurring.

[0100] When the vibration information exceeds the vibration threshold (YES in step S23), the vibration comparison unit 225 determines that a resonance phenomenon is occurring. In that case, the skip frequency setting unit 22 sets the driving frequency corresponding to the rotation speed of the motor M at the time of detection of the vibration information as a skip frequency, and stores the skip frequency in the storage unit 24 in step 524.

[0101] Meanwhile, when the vibration information is equal to or less than the vibration threshold (NO in step 523), the vibration comparison unit 225 determines that no resonance phenomenon occurs, and the processing proceeds to step S25.

[0102] In step 525, whether or not the skip frequency setting processing has been performed for all of the rotation speeds of the indoor fan 8 is determined. When it is determined that the skip frequency setting processing has been performed for all of the rotation speeds (YES in step S25), the series of processing is ended.

[0103] Furthermore, when it is determined that the skip frequency setting processing has not yet been performed for all of the rotation speeds (NO in step 525), the processing returns to step S22. At that time, in step S22, the inverter control unit 23 sets the rotation speed of the indoor fan 8 to a value different from the previous values. Then, with the changed rotation speed of the indoor fan 8, the processing of steps S23 and S24 is performed.

[0104] In this way, in Embodiment 3, while sequentially changing the rotation speed, the skip frequency setting processing is performed repeatedly for all of the rotation speeds in the preset rotation speed range. Then, after all skip frequencies in the preset rotation speed range are set, the inverter control unit 23 generates switching signals so that the motor M is not driven at the rotation speeds corresponding to the set skip frequencies in the subsequent operation.

[0105] Note that, although, in this example, the vibration detector 16 detects vibration information of the duct 40 and a skip frequency is set based on the detection result, the way of setting a skip frequency is not limited to this example. When vibration is generated, a noise is generated thereby. Thus, a noise detector, for example, is provided instead of the vibration detector 16, and a skip frequency may be set based a noise detected by the noise detector. In that case, the controller 20 compares noise information and a noise threshold having been set in advance, and determines that a resonance phenomenon is occurring when the noise information exceeds the noise threshold. The noise threshold is set to, for example, a noise value that is a reference indicating that no resonance occurs.

[0106] As described above, in the air-conditioning apparatus 1 according to Embodiment 3, whether or not a resonance phenomenon between the motor M and the duct 40 occurs is determined based on vibration detected by the vibration detector 16. At that time, the controller 20 determines that a resonance phenomenon is occurring when the vibration exceeds the vibration threshold. As with the case of Embodiment 2, with this configuration, even after the air-conditioning apparatus 1 is installed, a skip frequency can be automatically set at the installation site, and thus occurrence of resonance can be appropriately prevented.

[0107] Furthermore, in the air-conditioning apparatus 1, whether or not a resonance phenomenon between the motor M and the duct 40 occurs is determined by vibration detected by the noise detector. At that time, the controller 20 determines that a resonance phenomenon is occurring when noise exceeds the noise threshold. Also with this configuration, even after the air-conditioning apparatus 1 is installed, a skip frequency can be automatically set at the installation site, and thus occurrence of resonance can be appropriately prevented.

[0108] Embodiment 4 Next, Embodiment 4 will be described. Embodiment 4 differs from Embodiments 1 to 3 in that the presence or absence of a resonance phenomenon is determined based on the rotation speed of the motor M of the indoor fan 8. Note that, in Embodiment 4, the components common to Embodiments 1 to 3 will be denoted by the same reference signs, and their descriptions will be omitted.

[0109] In general, when a resonance phenomenon is occurring, the rotation speed of the motor M tends to become unstable compared with a case when no resonance phenomenon occurs. The actual rotation speed of the motor M may thus deviate significantly from a rotation speed command value given for the motor M from the controller 20. Therefore, in Embodiment 4, a skip frequency is automatically set based on the rotation speed of the motor M of the indoor fan 8.

[0110] Configuration of Controller 20 Fig. 12 is a functional block diagram illustrating an example of the configuration of a controller according to Embodiment 4. As shown in Fig. 12, the controller 20 includes a rotation speed comparison unit 325, in addition to the information acquisition unit 21, the skip frequency setting unit 22, the inverter control unit 23, and the storage unit 24. [0111] The information acquisition unit 21 is configured to acquire the rotation speed of the motor Mat the indoor fan 8 detected by the rotation speed detector 15. The rotation speed comparison unit 325 is configured to compare the rotation speed acquired by the information acquisition unit 21 and a rotation speed command value, which is based on switching signals supplied from the inverter control unit 23 to the inverter circuit 13, to determine whether or not a resonance phenomenon is occurring. When the rotation speed comparison unit 325 determines that a resonance phenomenon is occurring, the skip frequency setting unit 22 is configured to set, as a skip frequency, a driving frequency corresponding to the rotation speed.

[0112] Skip Frequency Setting Processing Fig. 13 is a flowchart illustrating an example of the flow of skip frequency setting processing of an air-conditioning apparatus according to Embodiment 4. In the skip frequency setting processing of Embodiment 4, whether or not a resonance phenomenon is occurring is determined based on the rotation speed of the motor M of the indoor fan 8.

[0113] In step S31, an air-sending operation of the air-conditioning apparatus 1 is started. The controller 20 sets the operation mode to an air-sending operation and causes the air-conditioning apparatus 1 to start the operation.

[0114] In step S32, the rotation speed of the indoor fan 8 is set. The inverter control unit 23 of the controller 20 generates switching signals that cause the indoor fan 8 to drive at a set rotation frequency and supplies the signals to the inverter circuit 13 of the power converter 10. Consequently, a load current corresponding to the preset rotation speed is output from the power converter 10 and supplied to the indoor fan 8. [0115] In step S33, whether or not a resonance phenomenon is occurring at the current rotation speed of the indoor fan 8 is determined. In Embodiment 4, whether or not a resonance phenomenon is occurring is determined based on the rotation speed of the motor M detected by the rotation speed detector 15. The rotation speed comparison unit 325 compares the rotation speed of the motor M of the indoor fan 8 and the rotation speed command value to determine whether or not a resonance phenomenon is occurring.

[0116] When the rotation speed of the motor M is significantly different from the rotation speed command value (YES in step S33), the rotation speed comparison unit 325 determines that a resonance phenomenon is occurring. In that case, in step S34, the skip frequency setting unit 22 sets the driving frequency corresponding to the rotation speed as a skip frequency, and stores the skip frequency in the storage unit 24. Note that a state where "the rotation speed of the motor M is significantly different from the rotation speed command value" means, for example, a state where "the rotation speed of the motor M deviates from a preset range" when the preset range including the rotation speed command value has been set in advance.

[0117] Meanwhile, when the rotation speed of the motor M is about the same as the rotation speed command value (NO in step S33), the rotation speed comparison unit 325 determines that no resonance phenomenon occurs, and the processing proceeds to step S35.

[0118] In step S35, whether or not the skip frequency setting processing has been performed for all of the rotation speeds of the indoor fan 8 is determined. When it is determined that the skip frequency setting processing has been performed for all of the rotation speeds (YES in step S35), the series of processing is ended.

[0119] Furthermore, when it is determined that the skip frequency setting processing has not yet been performed for all of the rotation speeds (NO in step S35), the processing returns to step S32. At that time, in step S32, the inverter control unit 23 sets the rotation speed of the indoor fan 8 to a value different from the previous values. Then, with the changed rotation speed of the indoor fan 8, the processing of steps 533 and S34 is performed.

[0120] In this way, in Embodiment 4, while sequentially changing the rotation speed, the skip frequency setting processing is performed repeatedly for all of the rotation speeds in the preset rotation speed range. Then, after all skip frequencies in the preset rotation speed range are set, the inverter control unit 23 generates switching signals so that the motor M is not driven at the rotation speeds corresponding to the set skip frequencies in the subsequent operation.

[0121] As described above, in the air-conditioning apparatus 1 according to Embodiment 4, whether or not a resonance phenomenon between the motor M and the duct 40 occurs is determined based on the rotation speed of the motor M detected by the rotation speed detector 15. At that time, the controller 20 determines that a resonance phenomenon is occurring when the rotation speed differs from the rotation speed command value. As with the cases of Embodiments 2 and 3, with this configuration, even after the air-conditioning apparatus 1 is installed, a skip frequency can be automatically set at the installation site, and thus occurrence of resonance can be appropriately prevented.

Reference Signs List [0122] 1: air-conditioning apparatus, 2: compressor, 3: refrigerant flow switching device, 4: outdoor heat exchanger, 5: outdoor fan, 6: expansion valve, 7: indoor heat exchanger, 8: indoor fan, 8a: air-sending element, 9: AC power source, 10: power converter, 11: rectifier, 12: smoothing circuit, 13: inverter circuit, 14: current detector, 15: rotation speed detector, 16: vibration detector, 20: controller, 21: information acquisition unit, 22: skip frequency setting unit, 23: inverter control unit, 24: storage unit, 30: remote, 35: processing circuit, 36: processor, 37: memory, 40: duct, 50: load, 125: current comparison unit, 225: vibration comparison unit, 325: rotation speed comparison unit

Claims

CLAIMS[Claim 1] An air-conditioning apparatus comprising: a fan having a motor and configured to send air to an air-conditioning target space by driving the motor; a peripheral component arranged around the fan; and a controller configured to control a rotation speed of the motor, wherein, when the rotation speed of the motor is a preset rotation speed and the motor resonates with the peripheral component, the controller is configured to set a frequency corresponding to the preset rotation speed as a skip frequency, which is set to prevent the motor from being driven at a specific rotation speed.[Claim 2] The air-conditioning apparatus of claim 1, further comprising: a current detector configured to detect a load current supplied to the motor, wherein the controller is configured to determine whether or not a resonance phenomenon is occurring between the motor and the peripheral component based on the load current detected by the current detector.[Claim 3] The air-conditioning apparatus of claim 2, wherein the controller is configured to determine that the resonance phenomenon is occurring when the load current exceeds a current threshold.[Claim 4] The air-conditioning apparatus of claim 2, wherein the controller is configured to determine that the resonance phenomenon is occurring when a state where an instantaneous value of the load current exceeds a range preset for an average value of the load current in a preset measurement time period, appears repeatedly for a preset number of times or more.[Claim 5] The air-conditioning apparatus of any one of claims 1 to 4, further comprising: a vibration detector configured to detect vibration of the fan or the peripheral component, wherein the controller is configured to determine whether or not a resonance phenomenon is occurring between the motor and the peripheral component based on the vibration detected by the vibration detector.[Claim 6] The air-conditioning apparatus of claim 5, wherein the controller is configured to determine that the resonance phenomenon is occurring when the vibration exceeds a vibration threshold.[Claim 7] The air-conditioning apparatus of any one of claims 1 to 6, further comprising: a noise detector configured to detect a noise of the fan or the peripheral component, wherein the controller is configured to determine whether or not a resonance phenomenon is occurring between the motor and the peripheral component based on the noise detected by the noise detector.[Claim 8] The air-conditioning apparatus of claim 7, wherein the controller is configured to determine that the resonance phenomenon is occurring when the noise exceeds a noise threshold.[Claim 9] The air-conditioning apparatus of any one of claims 1 to 8, further comprising: a rotation speed detector configured to detect a rotation speed of the motor, wherein the controller is configured to determine whether or not a resonance phenomenon is occurring between the motor and the peripheral component based on the rotation speed of the motor detected by the rotation speed detector.[Claim 10] The air-conditioning apparatus of claim 9, wherein the controller is configured to determine that the resonance phenomenon is occurring when the preset rotation speed deviates from a preset range including a rotation speed command value given for the motor.