Air conditioning apparatus

Abstract

The application discloses air conditioning equipment, in the fan motor design main winding, secondary winding, capacitor, four switches, the first end of the main winding is connected with the first end of the secondary winding, the second end of the secondary winding is connected with the first end of the capacitor, the second end of the capacitor is connected with the first end of the fourth switch, the second end of the fourth switch is connected with the second end of the main winding, the second end of the main winding is connected with the second power supply end; the first end of the third switch is connected with the first end of the secondary winding, the second end of the third switch is connected with the second end of the capacitor; the first end of the second switch is connected with the first power supply end, the second end of the second switch is connected with the second end of the secondary winding; the first end of the first switch is connected with the first power supply end, the second end of the first switch is connected with the first end of the main winding. The air conditioning equipment of the application realizes the fan motor speed regulation by changing the opening and closing of the first switch, the second switch, the third switch and the fourth switch, and solves the technical problem of high cost of the fan motor speed regulation in the prior art.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to air conditioning equipment. Background Technology

[0002] In fixed-speed air conditioners, the fan motor is generally a capacitor-run single-phase asynchronous motor. To save costs, it is usually a single-speed motor, which runs at a fixed speed after being powered on. Although this can meet the system requirements under most operating conditions, in some conditions, such as heating overload and low-temperature cooling, the outdoor unit's fan needs to run at a lower speed to reduce the capacity of the condenser or evaporator, thereby unloading or depressurizing the system. A single-speed motor cannot meet this requirement.

[0003] To regulate the speed of an AC fan, a tapped motor is typically used. This approach requires additional control switches for different speed settings; the number of switches corresponds to the number of speed settings. Furthermore, the motor itself needs to be designed individually, resulting in complex design, high cost, and poor versatility.

[0004] The original tap motor speed control is as follows: Figure 1 As shown, there are four speed settings: high, medium, low, and ultra-low. When a certain speed setting is needed, the control switch for that speed setting is closed, and the control switches for the other speed settings are open. The fan will then run at the speed set to that speed setting.

[0005] The principle of tapped motor speed control mainly involves adjusting the main magnetic flux of the motor windings. At the high fan speed, the main winding is directly connected to the power supply, resulting in maximum main magnetic flux, high torque, and high motor speed. At other speed settings, because the speed-regulating winding operates in series, the voltage distributed to the main winding decreases (the specific reduction ratio depends on the turns ratio of the speed-regulating winding and the main winding), and the main magnetic flux of the winding also decreases accordingly, causing the motor speed to drop.

[0006] Another option is to use thyristor chopper speed control, which is more flexible and has a wider speed range, but the motor's power supply has high harmonics, which can easily cause noise problems, and it requires a chopper, which is very expensive. Summary of the Invention

[0007] This invention proposes an air conditioning device that solves the technical problem of high cost of fan motor speed regulation in the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] This invention provides an air conditioning device, including a fan motor;

[0010] The fan motor includes:

[0011] Main winding;

[0012] Secondary winding;

[0013] capacitance;

[0014] A switch assembly, comprising a first switch, a second switch, a third switch, and a fourth switch;

[0015] Wherein, the first end of the main winding is connected to the first end of the auxiliary winding, the second end of the auxiliary winding is connected to the first end of the capacitor, the second end of the capacitor is connected to the first end of the fourth switch, the second end of the fourth switch is connected to the second end of the main winding, and the second end of the main winding is connected to the second power supply terminal.

[0016] The first end of the third switch is connected to the first end of the secondary winding, and the second end of the third switch is connected to the second end of the capacitor.

[0017] The first end of the second switch is connected to the first power supply terminal, and the second end of the second switch is connected to the second end of the auxiliary winding;

[0018] The first end of the first switch is connected to the first power supply terminal, and the second end of the first switch is connected to the first end of the main winding.

[0019] In some embodiments of this application, the control module of the air conditioning equipment is configured to: receive a speed control command, and control the opening and closing of the first switch, the second switch, the third switch, and the fourth switch according to the received speed control command.

[0020] In some embodiments of this application, the control module is further configured as follows:

[0021] Based on the received speed control command, query the correspondence between the preset speed control command and the control strategy to obtain the corresponding control strategy;

[0022] The opening and closing of the first switch, second switch, third switch, and fourth switch are controlled according to the corresponding control strategy.

[0023] In some embodiments of this application, the control module is further configured as follows:

[0024] When the received speed control command is the first speed control command, the first control strategy is executed, so that the fan motor runs at the first set speed;

[0025] The first control strategy is:

[0026] Control the first and fourth switches to close, and control the second and third switches to open.

[0027] In some embodiments of this application, the control module is further configured as follows:

[0028] When the received speed control command is the second speed control command, the second control strategy is executed, so that the fan motor runs at the second set speed;

[0029] The second control strategy is:

[0030] Control the first and fourth switches to close, and control the second and third switches to open;

[0031] After the first set time period, the fourth switch is turned off.

[0032] In some embodiments of this application, the control module is further configured as follows:

[0033] When the received speed control command is the third speed control command, the third control strategy is executed, so that the fan motor runs at the third set speed;

[0034] The third control strategy is as follows:

[0035] The first and fourth switches are controlled to open, and the second and third switches are controlled to close.

[0036] In some embodiments of this application, the control module is further configured as follows:

[0037] When the received speed control command is the fourth speed control command, the fourth control strategy is executed, so that the fan motor runs at the fourth set speed;

[0038] The fourth control strategy is as follows:

[0039] Control the first and fourth switches to open, and control the second and third switches to close;

[0040] After the second set time period, the third switch is turned off.

[0041] In some embodiments of this application, the first switch, the second switch, the third switch, and the fourth switch are relays.

[0042] In some embodiments of this application, the first power supply terminal is a live wire terminal; the second power supply terminal is a neutral wire terminal.

[0043] In some embodiments of this application, the fan motor is the motor of the outdoor fan of an air conditioning unit.

[0044] The technical solution of this invention has the following advantages over the prior art: The air conditioning device of this invention incorporates a main winding, an auxiliary winding, a capacitor, and four switches in the fan motor. The first end of the main winding is connected to the first end of the auxiliary winding; the second end of the auxiliary winding is connected to the first end of the capacitor; the second end of the capacitor is connected to the first end of a fourth switch; the second end of the fourth switch is connected to the second end of the main winding; and the second end of the main winding is connected to a second power supply terminal. Similarly, the first end of a third switch is connected to the first end of the auxiliary winding, and the second end of the third switch is connected to the second end of the capacitor. The first end of a second switch is connected to a first power supply terminal, and the second end of the second switch is connected to the second end of the auxiliary winding. The first end of a first switch is connected to the first power supply terminal, and the second end of the first switch is connected to the first end of the main winding. By changing the opening and closing of the first, second, third, and fourth switches, the series and parallel connection of the main winding, auxiliary winding, and capacitor can be altered, thereby changing the speed of the fan motor and achieving fan motor speed regulation. This speed regulation method is flexible, low-cost, and simple and reliable, solving the technical problem of high cost for fan motor speed regulation in the prior art.

[0045] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is the speed control circuit diagram for the tap motor;

[0048] Figure 2 This is a circuit diagram of one embodiment of the fan motor of the air conditioning equipment of the present invention;

[0049] Figure 3 A circuit diagram of the fan motor when executing the first control strategy;

[0050] Figure 4 A circuit diagram of the fan motor when executing the second control strategy;

[0051] Figure 5 A circuit diagram of the fan motor when executing the third control strategy;

[0052] Figure 6 A circuit diagram of the fan motor when executing the fourth control strategy;

[0053] Figure 7This is a schematic diagram showing the connection between the control module and the switch assembly;

[0054] Figure 8 A flowchart of one embodiment of the steps performed by the control module;

[0055] Figure 9 A flowchart of yet another embodiment of the steps performed by the control module;

[0056] Figure 10 A flowchart of yet another embodiment of the steps performed by the control module;

[0057] Figure 11 This is the speed-torque curve of the fan motor;

[0058] Figure 12 This is the speed-output power curve of the fan motor. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0065] Air conditioners execute refrigeration and heating cycles using a compressor, condenser, expansion valve, and evaporator. These cycles are controlled by a controller, which manages the refrigerant flow and the opening of the expansion valve. The refrigeration and heating cycles involve a series of processes including compression, condensation, expansion, and evaporation, ultimately supplying refrigerant to the conditioned and heat-exchanged air.

[0066] The compressor compresses refrigerant gas under high temperature and pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0067] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0068] An air conditioner outdoor unit refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. An air conditioner indoor unit includes the indoor heat exchanger, and an expansion valve can be provided in either the outdoor or indoor unit.

[0069] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0070] The air conditioning equipment in this embodiment includes a fan motor.

[0071] The fan motor includes the main winding U, auxiliary winding W, capacitor C, switching components, etc. See [link / reference needed]. Figure 2 As shown.

[0072] A switch assembly, comprising a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4.

[0073] The first end of the main winding U is connected to the first end of the secondary winding W, the second end of the secondary winding W is connected to the first end of the capacitor C, the second end of the capacitor C is connected to the first end of the fourth switch K4, the second end of the fourth switch K4 is connected to the second end of the main winding U, and the second end of the main winding U is connected to the second power supply terminal V2.

[0074] The first terminal of the third switch K3 is connected to the first terminal of the secondary winding W, and the second terminal of the third switch K3 is connected to the second terminal of the capacitor C.

[0075] The first end of the second switch K2 is connected to the first power supply terminal V1, and the second end of the second switch K2 is connected to the second end of the auxiliary winding W.

[0076] The first end of the first switch K1 is connected to the first power supply terminal V1, and the second end of the first switch K1 is connected to the first end of the main winding U.

[0077] The fan motor is a single-phase motor. Alternating current (AC) is connected between the first power supply terminal V1 and the second power supply terminal V2. For example, 220V AC is connected between the first power supply terminal V1 and the second power supply terminal V2.

[0078] By changing the opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4, the series and parallel connection of the main winding U, the auxiliary winding W, and the capacitor C are changed, thereby changing the voltage applied to the main winding U and thus changing the speed of the fan motor.

[0079] For example, when the first switch K1 and the fourth switch K4 are closed, and the second switch K2 and the third switch K3 are open, such as Figure 3 As shown, the secondary winding W is connected in series with the capacitor C, and then in parallel with the primary winding U, and connected between the first power supply terminal V1 and the second power supply terminal V2.

[0080] For example, when the first switch K1 and the fourth switch K4 are open, and the second switch K2 and the third switch K3 are closed, such as Figure 5 As shown, the secondary winding W is connected in parallel with the capacitor C, and then connected in series with the primary winding U, and connected between the first power supply terminal V1 and the second power supply terminal V2.

[0081] like Figure 3 , Figure 5 These two connection methods differ in the series and parallel connection of the main winding U, the auxiliary winding W, and the capacitor C, as well as the voltage applied to the main winding U and the speed of the fan motor.

[0082] In this embodiment of the air conditioning equipment, the fan motor is designed with a main winding, an auxiliary winding, a capacitor, and four switches. The first end of the main winding U is connected to the first end of the auxiliary winding W, the second end of the auxiliary winding W is connected to the first end of the capacitor C, the second end of the capacitor C is connected to the first end of the fourth switch K4, the second end of the fourth switch K4 is connected to the second end of the main winding U, and the second end of the main winding U is connected to the second power supply terminal V2. The first end of the third switch K3 is connected to the first end of the auxiliary winding W, and the second end of the third switch K3 is connected to the second end of the capacitor C. The first end of the second switch K2 is connected to the first power supply terminal V1, and the second end of the second switch K2 is connected to the second end of the auxiliary winding W. The first end of the first switch K1 is connected to the first power supply terminal V1, and the second end of the first switch K1 is connected to the first end of the main winding U. The air conditioning equipment in this embodiment changes the series and parallel connection of the main winding, auxiliary winding, and capacitor by changing the opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4, thereby changing the speed of the fan motor and realizing speed regulation of the fan motor. The speed regulation method is flexible, low-cost, and simple and reliable to control, solving the technical problem of high cost of fan motor speed regulation in the prior art.

[0083] In this embodiment of the air conditioning equipment, the fan motor is a single-speed motor. By controlling the opening and closing of four switches, multi-speed control of the single-speed motor can be achieved. The control is simple, reliable, and low-cost.

[0084] In some embodiments of this application, the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are relays. Relays are convenient to control and have stable performance.

[0085] In some embodiments of this application, to ensure circuit safety, the first power supply terminal V1 is a live wire terminal used to connect to the live wire. The second power supply terminal V2 is a neutral wire terminal used to connect to the neutral wire.

[0086] The air conditioning unit also includes a control module to control the opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4. (See attached image) Figure 7 As shown.

[0087] In some embodiments of this application, the control module is configured to: receive a speed control command, and control the opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 according to the received speed control command.

[0088] The control module performs the following steps, see [link / reference]. Figure 8 As shown.

[0089] Step S11: Receive speed control command.

[0090] Step S12: According to the received speed control command, control the opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4.

[0091] In this embodiment of the air conditioning equipment, the control module controls the opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 according to the received speed control command, thereby changing the series and parallel connection of the main winding, the auxiliary winding, and the capacitor of the fan motor, and thus changing the voltage applied to the main winding to change the speed of the fan motor, thereby realizing the speed regulation of the fan motor. The speed regulation method is flexible, low in cost, and simple and reliable in control.

[0092] In some embodiments of this application, in order to facilitate obtaining the corresponding control strategy, the control module is further configured as follows:

[0093] Based on the received speed control command, query the correspondence between the preset speed control command and the control strategy to obtain the corresponding control strategy;

[0094] The opening and closing of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are controlled according to the corresponding control strategy.

[0095] The correspondence between preset speed control commands and control strategies is saved.

[0096] Different control strategies result in different opening and closing controls for the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4.

[0097] For example, the first speed control command corresponds to the first control strategy; the second speed control command corresponds to the second control strategy; the third speed control command corresponds to the third control strategy; and the fourth speed control command corresponds to the fourth control strategy.

[0098] The control module obtains the corresponding control strategy by querying the preset correspondence based on the received speed control command, and then controls the opening and closing of the first switch, the second switch, the third switch, and the fourth switch, which is simple, convenient, and accurate.

[0099] In some embodiments of this application, the control module is further configured as follows:

[0100] When the received speed control command is the first speed control command, the first control strategy is executed, so that the fan motor runs at the first set speed.

[0101] The first control strategy is to close the first switch K1 and the fourth switch K4, and open the second switch K2 and the third switch K3. This is the starting condition for the first set speed.

[0102] When the first switch K1 and the fourth switch K4 are closed, and the second switch K2 and the third switch K3 are open, the wiring diagram is as follows: Figure 3 As shown, the auxiliary winding is connected in series with the capacitor, and then in parallel with the main winding, connected between the first power supply terminal and the second power supply terminal. The fan motor runs at the first set speed. At this time, the motor winding connection method is the capacitor-run connection method.

[0103] When the control module receives the first speed control command, it controls the first switch K1 and the fourth switch K4 to close, and controls the second switch K2 and the third switch K3 to open, so that the fan motor runs at the first set speed. The speed regulation method is flexible, reliable and low cost.

[0104] In some embodiments of this application, the control module is further configured as follows:

[0105] When the received speed control command is the second speed control command, the second control strategy is executed, so that the fan motor runs at the second set speed.

[0106] The second control strategy is as follows: control the first switch K1 and the fourth switch K4 to close, and control the second switch K2 and the third switch K3 to open; after a first set time period, control the fourth switch K4 to open.

[0107] That is, after receiving the second speed control command, the control module executes the following steps, see [link to relevant documentation]. Figure 9 As shown.

[0108] Step S21: Close the first switch K1 and the fourth switch K4, and open the second switch K2 and the third switch K3. The wiring diagram is as follows. Figure 3 As shown, this causes the fan motor to run at the first set speed.

[0109] Step S22: After the first set duration (e.g., 10 seconds), control the fourth switch K4 to disconnect, as follows. Figure 4 As shown, this causes the fan motor to run at the second set speed.

[0110] That is, after the first set time period, the first switch K1 is in the closed state, and the second switch K2, the third switch K3, and the fourth switch K4 are all in the open state, as shown in the wiring diagram. Figure 4 As shown.

[0111] like Figure 4 As shown, the motor is operating with one phase. According to the working principle of the fan motor, under the condition of single-phase operation, the maximum torque of the motor is between 0.5 and 0.6 times that of the capacitor-operated connection. In this state, the motor itself does not have starting torque, so starting directly from zero speed will result in starting failure. It is necessary to run the motor to the first set speed according to the starting conditions of the first set speed, and after stabilization (after the first set time), disconnect the fourth switch K4. Finally, after the motor and load are balanced, it will stabilize at the second set speed.

[0112] The second set speed is less than the first set speed.

[0113] When the control module receives the second speed control command, it first controls the first switch K1 and the fourth switch K4 to close, and controls the second switch K2 and the third switch K3 to open. After the first set time, it then controls the fourth switch K4 to open, so that the fan motor can start smoothly and run at the second set speed. The speed regulation method is flexible, reliable and low cost.

[0114] In some embodiments of this application, the control module is further configured as follows:

[0115] When the received speed control command is the third speed control command, the third control strategy is executed, so that the fan motor runs at the third set speed;

[0116] The third control strategy is as follows: control the first switch K1 and the fourth switch K4 to open, and control the second switch K2 and the third switch K3 to close. This is the starting condition for the third set speed.

[0117] When the first switch K1 and the fourth switch K4 are open, and the second switch K2 and the third switch K3 are closed, the wiring diagram is as follows: Figure 5 As shown, the secondary winding is connected in parallel with the capacitor, and then connected in series with the main winding, and connected between the first power supply terminal and the second power supply terminal. The fan motor runs at the third set speed.

[0118] In this connection method, the current direction in the secondary winding is opposite to that in the capacitor-operated connection method. Since the current in the secondary winding lags behind the current in the primary winding, it is equivalent to a current in the same direction leading, so the motor's direction of rotation remains unchanged. Based on the working principle of the fan motor, the maximum torque of the motor in this configuration is approximately 0.2 times that of the capacitor-operated connection method.

[0119] The third set speed is less than the second set speed.

[0120] When the control module receives the third speed control command, it controls the first switch K1 and the fourth switch K4 to open, and controls the second switch K2 and the third switch K3 to close, so that the fan motor runs at the third set speed. The speed regulation method is flexible, reliable and low cost.

[0121] In some embodiments of this application, the control module is further configured as follows:

[0122] When the received speed control command is the fourth speed control command, the fourth control strategy is executed, so that the fan motor runs at the fourth set speed.

[0123] The fourth control strategy is as follows: control the first switch K1 and the fourth switch K4 to open, and control the second switch K2 and the third switch K3 to close; after the second set time, control the third switch K3 to open.

[0124] That is, after receiving the fourth speed control command, the control module executes the following steps, see below. Figure 10 As shown.

[0125] Step S31: Control the first switch K1 and the fourth switch K4 to open, and control the second switch K2 and the third switch K3 to close. The wiring diagram is as follows. Figure 5 As shown, this causes the fan motor to run at the third set speed.

[0126] Step S32: After the second set time (e.g., 10 seconds), control the third switch K3 to disconnect, as follows. Figure 6 As shown, this causes the fan motor to run at the fourth set speed.

[0127] That is, after the second set time period, the first switch K1, the third switch K3, and the fourth switch K4 are all in the open state, and the second switch K2 is in the closed state. The wiring diagram is as follows. Figure 6 As shown.

[0128] like Figure 6 As shown, in this state, the motor itself does not have starting torque. It is necessary to run the motor to the third set speed according to the starting conditions of the third set speed. After stabilization (after the second set time), the third switch K3 is disconnected. Finally, after the motor and the load are balanced, it stabilizes at the fourth set speed.

[0129] The fourth set speed is less than the third set speed.

[0130] When the control module receives the fourth speed control command, it first controls the first switch K1 and the fourth switch K4 to open, and controls the second switch K2 and the third switch K3 to close. After the second set time, it controls the third switch K3 to open, so that the fan motor can start smoothly and run at the fourth set speed. The speed regulation method is flexible, reliable and low cost.

[0131] Below, in conjunction with Figure 11 , Figure 12 The speed regulation process of the fan motor is explained.

[0132] Taking a fan motor as an example, the input power is 220V~50Hz, the number of poles is 4, the rated output power at high fan speed is 136W, and the rated speed is 1350rpm. The fan load characteristics can be referenced. Figure 11 Its characteristic is that the torque is directly proportional to the square of the speed.

[0133] (1) Upon receiving the first speed control command (high wind speed operation command), execute the first control strategy (i.e., high wind speed start condition or first set speed start condition) to make the fan motor run at the first set speed (high wind speed).

[0134] First control strategy: K1 and K4 are closed, K2 and K3 are open, wiring diagram as follows. Figure 3 As shown, the motor winding connection is a capacitor-run connection, and the fan motor runs at the high speed.

[0135] (2) Upon receiving the second speed control command (medium wind speed operation command), the second control strategy is executed to make the fan motor run at the second set speed (medium wind speed).

[0136] Second control strategy: First, K1 and K4 are closed, and K2 and K3 are opened. The wiring diagram is as follows. Figure 3 As shown, disconnect K4 after 10 seconds. The wiring diagram is as follows. Figure 4 As shown.

[0137] like Figure 4As shown, the motor is operating with one phase. According to the working principle of the fan motor, under the condition of single-phase operation, the maximum torque of the motor is between 0.5 and 0.6 times that of the capacitor-run connection. In this state, the motor itself does not have starting torque, so starting directly from zero speed will result in starting failure. It is necessary to run the motor to the high fan speed first, and after stabilization, disconnect K4. Finally, after the motor and load are balanced, it stabilizes at the medium fan speed. In this state, the output power of the motor at the original rated speed of 1350 rpm is 85W, which cannot meet the balance condition. In order to meet the load balance, the motor will run at a reduced speed. Figure 11 At the intersection of the load torque curve and the motor torque curve, the motor speed stabilizes at around 1200 pm.

[0138] (3) Upon receiving the third speed control command (low wind speed operation command), execute the third control strategy (i.e., low wind speed start condition or third set speed start condition) to make the fan motor run at the third set speed (low wind speed).

[0139] Third control strategy: K1 and K4 are open, K2 and K3 are closed, as shown in the wiring diagram. Figure 5 As shown, the capacitor is connected in parallel with the secondary winding and then in series with the primary winding. The fan motor operates at the low speed setting.

[0140] In this speed control method, the current direction in the secondary winding is opposite to that in the capacitor-operated connection method. Since the current in the secondary winding lags behind the current in the primary winding, it is equivalent to a current in the same direction leading, so the motor's direction of rotation remains unchanged. Based on the working principle of the fan motor, the maximum torque of the motor in this method is approximately 0.2 times that in the capacitor-operated connection method. The fan motor's output power is 15W, and its speed is 500rpm.

[0141] (4) Upon receiving the fourth speed control command (ultra-low wind speed operation command), the fourth control strategy is executed to make the fan motor run at the fourth set speed (ultra-low wind speed).

[0142] Fourth control strategy: First, K1 and K4 are disconnected, and K2 and K3 are closed. Wiring diagram as follows: Figure 5 As shown, disconnect K3 after 10 seconds. The wiring diagram is as follows. Figure 6 As shown.

[0143] like Figure 6As shown, with K3 disconnected, the auxiliary winding current flows into the main winding in the opposite direction. In this state, the motor itself lacks starting torque and needs to be started at a low fan speed, stabilizing before disconnecting K3. Finally, after the motor and load are balanced, the motor stabilizes at the ultra-low fan speed. In this state, the motor's output power at its original rated speed of 500 rpm is 15W, which is insufficient to meet the balancing conditions. To achieve load balance, the fan will reduce its speed, stabilizing at around 300 rpm at the intersection of the load torque curve and the motor torque curve.

[0144] In this embodiment of the air conditioning equipment, taking advantage of existing conditions, the tapped motor is replaced with a single-speed motor based on the original tapped speed-regulating motor control. Speed ​​regulation is achieved by controlling the timing of the main and auxiliary phase windings of the single-speed motor and the fan capacitor.

[0145] In some embodiments of this application, the fan motor is the motor of the outdoor fan of the air conditioning equipment.

[0146] When the air conditioning equipment is under conditions such as overload heating or low-temperature cooling, the outdoor fan needs to run at a lower speed. At this time, by executing the fourth control strategy, the fan motor can run at the fourth set speed (ultra-low fan speed) to meet the requirements of the air conditioning equipment under conditions such as overload heating or low-temperature cooling, and ensure the normal operation of the air conditioning equipment.

[0147] In some embodiments of this application, the fan refers to the external fan of an air conditioning unit.

[0148] In some embodiments of this application, the control module can be set up independently of the outdoor unit.

[0149] In some embodiments of this application, the control module may also be integrated on the outdoor unit. For example, the control module is integrated on the outdoor unit's outdoor circuit board.

[0150] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0151] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning unit, including a fan motor, characterized in that, The fan motor includes: Main winding; Secondary winding; capacitance; A switch assembly, comprising a first switch, a second switch, a third switch, and a fourth switch; Wherein, the first end of the main winding is connected to the first end of the auxiliary winding, the second end of the auxiliary winding is connected to the first end of the capacitor, the second end of the capacitor is connected to the first end of the fourth switch, the second end of the fourth switch is connected to the second end of the main winding, and the second end of the main winding is connected to the second power supply terminal. The first end of the third switch is connected to the first end of the secondary winding, and the second end of the third switch is connected to the second end of the capacitor. The first end of the second switch is connected to the first power supply terminal, and the second end of the second switch is connected to the second end of the auxiliary winding; The first end of the first switch is connected to the first power supply terminal, and the second end of the first switch is connected to the first end of the main winding.

2. The air conditioning equipment according to claim 1, characterized in that: The control module of the air conditioning equipment is configured to: receive speed control commands and control the opening and closing of the first switch, the second switch, the third switch, and the fourth switch according to the received speed control commands.

3. The air conditioning equipment according to claim 2, characterized in that: The control module is also configured to: Based on the received speed control command, query the correspondence between the preset speed control command and the control strategy to obtain the corresponding control strategy; The opening and closing of the first switch, second switch, third switch, and fourth switch are controlled according to the corresponding control strategy.

4. The air conditioning equipment according to claim 2, characterized in that: The control module is also configured to: When the received speed control command is the first speed control command, the first control strategy is executed, so that the fan motor runs at the first set speed; The first control strategy is: Control the first and fourth switches to close, and control the second and third switches to open.

5. The air conditioning equipment according to claim 2, characterized in that: The control module is also configured to: When the received speed control command is the second speed control command, the second control strategy is executed, so that the fan motor runs at the second set speed; The second control strategy is: Control the first and fourth switches to close, and control the second and third switches to open; After the first set time period, the fourth switch is turned off.

6. The air conditioning equipment according to claim 2, characterized in that: The control module is also configured to: When the received speed control command is the third speed control command, the third control strategy is executed, so that the fan motor runs at the third set speed; The third control strategy is as follows: The first and fourth switches are controlled to open, and the second and third switches are controlled to close.

7. The air conditioning equipment according to claim 2, characterized in that: The control module is also configured to: When the received speed control command is the fourth speed control command, the fourth control strategy is executed, so that the fan motor runs at the fourth set speed; The fourth control strategy is as follows: Control the first and fourth switches to open, and control the second and third switches to close; After the second set time period, the third switch is turned off.

8. The air conditioning equipment according to claim 1, characterized in that: The first switch, the second switch, the third switch, and the fourth switch are relays.

9. The air conditioning equipment according to claim 1, characterized in that: The first power supply terminal is the live wire terminal; the second power supply terminal is the neutral wire terminal.

10. The air conditioning equipment according to any one of claims 1 to 9, characterized in that: The fan motor is the motor of the outdoor fan of the air conditioning equipment.

Images