Fan control device of air conditioner, control method thereof, and air conditioner

Abstract

The application discloses a fan control device of an air conditioner, a control method of the fan control device and the air conditioner. The device comprises: a pair of permanent magnets with opposite magnetic poles arranged on a volute of an alternating current motor; a ring-shaped electrifying device arranged at the periphery of a centrifugal fan blade and capable of rotating with the centrifugal fan blade; a pair of electric brushes arranged on a back plate of an indoor unit; in the case that the ring-shaped electrifying device is in communication with the pair of electric brushes, current flows through the ring-shaped electrifying device; and a control unit for controlling the size and direction of the current in the ring-shaped electrifying device according to the current rotating speed, the target rotating speed and the current rotating direction of the alternating current motor, so as to control the size and direction of the force of the pair of permanent magnets on the centrifugal fan blade in the magnetic field of the pair of permanent magnets, and to realize the adjustment of the load of the alternating current motor. According to the scheme, the ring-shaped electrifying device is arranged at the periphery of the centrifugal fan blade in the indoor unit, the current size of the ring-shaped electrifying device is adjusted according to the current rotating speed and the target rotating speed of the motor, the load of the motor is changed, and the stability of the rotating speed of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to a fan control device of an air conditioner, the air conditioner, and a control method of the fan control device of the air conditioner, and more particularly relates to a fan system of a square cabinet air conditioner, an air conditioner with the fan system, and a control method of the fan system of the square cabinet air conditioner. BACKGROUND

[0002] In related solutions, the indoor unit of the air conditioner can be a cabinet air conditioner. The AC motor used by the cabinet air conditioner (such as a square cabinet air conditioner) will cause problems such as noise and wind volume change in actual work due to unstable rotation speed of the AC motor, which affects the comfort experience of users and increases the energy consumption of the air conditioner.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The purpose of the present application is to provide a fan control device of an air conditioner, the air conditioner, and a control method of the fan control device of the air conditioner, to solve the problem that the AC motor used by the cabinet air conditioner (such as a square cabinet air conditioner) will cause problems such as noise and wind volume change in actual work due to unstable rotation speed of the AC motor, which affects the comfort experience of users and increases the energy consumption of the air conditioner, to achieve the effect of improving the stability of the rotation speed of the motor by setting a ring-shaped power supply device on the periphery of the fan blade of the indoor fan of the air conditioner, adjusting the current size of the ring-shaped power supply device according to the difference between the actual rotation speed and the target rotation speed of the motor to change the load of the motor.

[0005] The present application provides a fan control device of an air conditioner, wherein the air conditioner has an indoor unit; the indoor unit has a centrifugal fan, and the centrifugal fan has an AC motor and a centrifugal fan blade; a pair of permanent magnets with opposite magnetic poles are arranged on the volute of the AC motor; the fan control device of the air conditioner comprises a ring-shaped power supply device, a sampling unit, and a control unit; the ring-shaped power supply device is arranged on the periphery of the centrifugal fan blade and can rotate with the centrifugal fan blade; a pair of brushes are arranged on the back plate of the indoor unit; in the case where the ring-shaped power supply device is in communication with the pair of brushes, there is current flowing through the ring-shaped power supply device; wherein the sampling unit is used to sample the target rotation speed of the AC motor, sample the current rotation speed of the AC motor, and sample the current rotation direction of the AC motor under the condition that the centrifugal fan is running; the control unit is used to control the size and direction of the current in the ring-shaped power supply device according to the current rotation speed of the AC motor and the target rotation speed of the AC motor, and in combination with the current rotation direction of the AC motor, to control the size and direction of the force of the pair of permanent magnets on the centrifugal fan blade in the magnetic field thereof, so as to adjust the load of the AC motor.

[0006] In some embodiments, the ring-shaped current supply device comprises a current supply ring, conductor rods and current supply bars; the number of the conductor rods is the same as the number of the blades of the centrifugal fan blade, each of the conductor rods is fixedly arranged at the outer end of a corresponding blade of the centrifugal fan blade; the current supply ring is arranged at the upper end of all the conductor rods and has a ring-shaped structure; the number of the current supply bars is the same as the number of the conductor rods; each of the current supply bars is arranged at the lower end of a corresponding conductor rod and is spaced and insulated from the adjacent current supply bar; when any of the current supply bars is connected with one of the pair of brushes, the ring-shaped current supply device is connected with the pair of brushes.

[0007] In some embodiments, the pair of brushes are symmetrically arranged; each of the pair of brushes has a U-shaped slot structure and is arranged in the opposite direction of the U-shaped slot structure in the rotation direction of the centrifugal fan blade, so that the pair of brushes are connected with the ring-shaped current supply device; and / or the pair of permanent magnets are symmetrically arranged; each of the pair of permanent magnets is vertically inserted from the square hole above the volute and is fixedly arranged.

[0008] In order to match the above-mentioned device, the present application further provides an air conditioner comprising the above-mentioned fan control device of the air conditioner.

[0009] In order to match the above-mentioned air conditioner, the present application further provides a control method of the fan control device of the air conditioner, comprising: when the centrifugal fan is running, sampling the target rotating speed of the AC motor, sampling the current rotating speed of the AC motor, and sampling the current rotating direction of the AC motor; according to the current rotating speed of the AC motor and the target rotating speed of the AC motor, and in combination with the current rotating direction of the AC motor, controlling the size and direction of the current in the ring-shaped current supply device, so as to control the size and direction of the force of the pair of permanent magnets on the centrifugal fan blade in the magnetic field of the pair of permanent magnets, and to realize the adjustment of the load of the AC motor.

[0010] In some embodiments, the magnitude and direction of the current in the ring-shaped current device are controlled according to the current rotational speed of the AC motor and the target rotational speed of the AC motor, and in combination with the current rotational direction of the AC motor, including: determining the absolute value of the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor, denoted as the current rotational speed absolute difference value of the AC motor; determining whether the current rotational speed absolute difference value of the AC motor is less than or equal to a set rotational speed deviation threshold; if it is determined that the current rotational speed absolute difference value of the AC motor is less than or equal to the set rotational speed deviation threshold, the AC motor is controlled to maintain the current rotational speed of the AC motor; if it is determined that the current rotational speed absolute difference value of the AC motor is greater than the set rotational speed deviation threshold, the magnitude and direction of the current in the ring-shaped current device are controlled according to the current rotational speed of the AC motor and the target rotational speed of the AC motor, and in combination with the current rotational direction of the AC motor, to correct the current rotational speed of the AC motor, and control the AC motor to operate at the corrected rotational speed of the AC motor.

[0011] In some embodiments, the magnitude and direction of the current in the ring-shaped current device are controlled according to the current rotational speed of the AC motor and the target rotational speed of the AC motor, and in combination with the current rotational direction of the AC motor, to correct the current rotational speed of the AC motor, including: in the case where the current rotational direction of the AC motor is a preset first direction, determining whether the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is greater than a set rotational speed deviation threshold; if it is determined that the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is greater than the set rotational speed deviation threshold, the magnitude and direction of the current in the ring-shaped current device are controlled to be a preset first current, at this time, the direction of the current between the pair of permanent magnets is from N-pole to S-pole; the direction of the preset first current is the same as the direction of the current between the pair of permanent magnets.

[0012] In some embodiments, the magnitude and direction of the current in the ring-shaped current supply are controlled according to the current rotational speed of the AC motor and the target rotational speed of the AC motor, and in combination with the current rotational direction of the AC motor, to correct the current rotational speed of the AC motor, and further comprising: after the magnitude of the first preset current is controlled, determining again whether the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is still greater than the set rotational speed deviation threshold; if it is determined again that the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is still greater than the set rotational speed deviation threshold, increasing the magnitude of the first preset current in a preset increasing manner and maintaining the direction of the first preset current unchanged; if it is determined again that the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is not greater than the set rotational speed deviation threshold, determining whether the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is greater than the set rotational speed deviation threshold; if it is determined that the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is greater than the set rotational speed deviation threshold, decreasing the magnitude of the first preset current in a preset decreasing manner and maintaining the direction of the first preset current unchanged; and if it is determined that the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is not greater than the set rotational speed deviation threshold, maintaining the magnitude of the first preset current unchanged and maintaining the direction of the first preset current unchanged.

[0013] In some embodiments, the magnitude and direction of the current in the ring-shaped current supply are controlled according to the current rotational speed of the AC motor and the target rotational speed of the AC motor, and in combination with the current rotational direction of the AC motor, to correct the current rotational speed of the AC motor, and further comprising: in the case that the current rotational direction of the AC motor is a second preset direction, determining whether the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is greater than the set rotational speed deviation threshold; if it is determined that the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is greater than the set rotational speed deviation threshold, controlling the magnitude and direction of the current in the ring-shaped current supply to be a second preset current, at this time, the direction of the current between the pair of permanent magnets is from S pole to N pole; and the direction of the second preset current is the same as the direction of the current between the pair of permanent magnets.

[0014] In some embodiments, according to the current rotating speed of the AC motor and the target rotating speed of the AC motor, and in combination with the current rotating direction of the AC motor, the magnitude and direction of the current in the annular current-carrying device are controlled to correct the current rotating speed of the AC motor, and further comprising: after the magnitude and direction of the current in the annular current-carrying device are controlled to be the preset second current, it is determined again whether the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is still greater than the set rotating speed deviation threshold; if it is determined again that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is still greater than the set rotating speed deviation threshold, the magnitude of the preset second current is increased in a preset increasing manner and the direction of the preset second current is maintained unchanged; if it is determined again that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is not greater than the set rotating speed deviation threshold, it is determined whether the difference between the current rotating speed of the AC motor and the target rotating speed of the AC motor is greater than the set rotating speed deviation threshold; if it is determined that the difference between the current rotating speed of the AC motor and the target rotating speed of the AC motor is greater than the set rotating speed deviation threshold, the magnitude of the preset second current is decreased in a preset decreasing manner and the direction of the preset second current is maintained unchanged; if it is determined that the difference between the current rotating speed of the AC motor and the target rotating speed of the AC motor is not greater than the set rotating speed deviation threshold, the magnitude of the preset second current is maintained unchanged and the direction of the preset second current is maintained unchanged.

[0015] Therefore, the scheme of the present application, in the case that the indoor unit of the air conditioner is a cabinet (such as a square cabinet), a pair of permanent magnets (such as permanent magnet 1) are symmetrically arranged on both sides of the volute of the AC motor in the centrifugal fan in the indoor fan, an annular current-carrying device (such as annular current-carrying device 4) is arranged on the periphery of the fan blade of the centrifugal fan, a pair of brushes (such as brush 6) are arranged on the back plate (such as back plate 7) of the indoor unit, and the annular current-carrying device is electrified with the brushes when the annular current-carrying device rotates with the fan blade to exert a forward and reverse force on the fan blade; during the operation of the centrifugal fan, according to the difference between the actual rotating speed of the AC motor and the target rotating speed, the magnitude and direction of the current of the annular current-carrying device are controlled to change the magnitude and direction of the force exerted on the fan blade, so as to adjust the load of the AC motor to avoid the noise resonance point of the AC motor; thereby, by arranging the annular current-carrying device on the periphery of the fan blade in the indoor fan of the air conditioner, the current magnitude of the annular current-carrying device is adjusted according to the difference between the actual rotating speed and the target rotating speed of the motor to change the load of the motor, so as to improve the stability of the motor rotating speed.

[0016] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application.

[0017] The technical solutions of the present application will be described in further detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure schematic diagram of an embodiment of the fan control device of the air conditioner of the present application;

[0019] Figure 2 Structure schematic diagram of the fan system of the square cabinet machine of the air conditioner;

[0020] Figure 3 Assembly structure schematic diagram of the fan blade, the annular current conducting device and the brush, wherein (a) is the overall assembly structure schematic diagram, and (b) is the partial enlarged schematic diagram of A part in (a);

[0021] Figure 4 Structure schematic diagram of the annular current conducting device and the brush parts, wherein (a) is the structure schematic diagram of the annular current conducting device, and (b) is the structure schematic diagram of the brush parts;

[0022] Figure 5 Assembly structure schematic diagram of the permanent magnet and the volute;

[0023] Figure 6 Force condition schematic diagram of the fan blade, wherein (a) is the first force condition schematic diagram, and (b) is the second force condition schematic diagram;

[0024] Figure 7 Current flow direction schematic diagram, wherein (a) is the first flow direction schematic diagram, and (b) is the second flow direction schematic diagram;

[0025] Figure 8 Structure schematic diagram of the control module for controlling the annular current conducting device;

[0026] Figure 9 Control flow schematic diagram of the control module for controlling the annular current conducting device;

[0027] Figure 10 Flow schematic diagram of the first rotating speed correction flow (i.e. the flow of rotating speed correction 1);

[0028] Figure 11 Flow schematic diagram of the second rotating speed correction flow (i.e. the flow of rotating speed correction 2);

[0029] Figure 12 Flow schematic diagram of an embodiment of the control method of the fan control device of the present application;

[0030] Figure 13 Flow schematic diagram of an embodiment of the method for controlling the size and direction of the current in the annular current conducting device 4 in the present application;

[0031] Figure 14 Fig. 1 is a flow chart of an embodiment of a first process for correcting the current rotating speed of the AC motor in the method of the present application when the current rotating direction of the AC motor is the preset first direction;

[0032] Figure 15 Fig. 2 is a flow chart of an embodiment of a second process for correcting the current rotating speed of the AC motor in the method of the present application when the current rotating direction of the AC motor is the preset first direction;

[0033] Figure 16 Fig. 3 is a flow chart of an embodiment of a first process for correcting the current rotating speed of the AC motor in the method of the present application when the current rotating direction of the AC motor is the preset second direction;

[0034] Figure 17 Fig. 4 is a flow chart of an embodiment of a second process for correcting the current rotating speed of the AC motor in the method of the present application when the current rotating direction of the AC motor is the preset second direction.

[0035] In the embodiments of the present application, the reference signs are as follows in combination with the drawings:

[0036] 1 - permanent magnet; 2 - volute; 3 - centrifugal fan blade; 4 - annular energizing device; 41 - energizing ring; 42 - conductor rod; 43 - energizing strip; 5 - motor; 6 - brush; 7 - back plate; 101 - signal transmitting module; 102 - signal receiving module; 103 - main control module; 104 - processing module. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] It is considered that the AC motor used in the cabinet air conditioner will have unstable rotating speed due to load, voltage fluctuation, temperature rise of the motor, mechanical structure and other reasons in actual work, which will cause many influences, such as affecting the service life of the components on the motor controller mainboard of the motor and the cabinet, causing noise, air volume change and other problems, affecting the use comfort of the user, and also causing the energy consumption of the cabinet to increase and other problems.

[0039] Wherein, the load refers to the object that needs to rotate such as a fan blade, such as long-term operation, the fan blade has a lot of dust, the fan blade becomes heavy, the motor output same torque, the fan blade rotation speed will become small, the voltage refers to the working voltage of the motor, such as, the rated working voltage of the motor is 220V, if the actual working voltage is low due to the reason such as the power peak period, it will cause the motor to not reach the rated speed (i.e. the speed under the rated voltage), the working time of the motor is too long, which will cause the temperature to rise, which will cause the working stability of the motor to decrease, unable to maintain the same speed, which will cause fluctuations, the mechanical assembly of the motor (such as too large assembly gap), which will cause the actual speed of the motor to deviate from the set speed, or long-term operation of the parts will also affect the speed.

[0040] Therefore, the scheme of the present application proposes a fan control device of an air conditioner, in particular, a fan system of a square cabinet machine of an air conditioner, by arranging permanent magnets 1 on the left and right sides of the volute of the alternating current motor in the cabinet machine of the air conditioner, and arranging a circuit (such as a ring-shaped power supply device 4) on the centrifugal fan blade 3 in the cabinet machine of the air conditioner and supplying power, by controlling the current direction of the ring-shaped power supply device 4, the positive and negative forces on the centrifugal fan blade 3 are applied, by controlling the current size of the ring-shaped power supply device 4, the size of the force applied to the centrifugal fan blade 3 is changed, thereby changing the load of the motor, adjusting and stabilizing the speed of the motor, avoiding the effect of noise resonance point, and improving the use comfort of the user.

[0041] According to the embodiment of the present application, a fan control device of an air conditioner is provided. Referring to Figure 1 The structure schematic diagram of an embodiment of the device of the present application is shown. The air conditioner has an indoor unit, and the indoor unit is a cabinet machine; the indoor unit has a centrifugal fan, and the centrifugal fan has an alternating current motor and a centrifugal fan blade 3; a pair of permanent magnets 1 with opposite magnetic poles are arranged on the volute of the alternating current motor; the fan control device of the air conditioner comprises a ring-shaped power supply device 4, a sampling unit and a control unit; the ring-shaped power supply device 4 is arranged on the periphery of the centrifugal fan blade 3 and can rotate with the centrifugal fan blade 3; a pair of brushes 6 are arranged on the back plate 7 of the indoor unit; in the case that the ring-shaped power supply device 4 is in communication with the pair of brushes 6, there is current flowing through the ring-shaped power supply device 4.

[0042] Wherein, the sampling unit is used to sample the target speed of the alternating current motor (such as the target speed R of the motor) under the condition that the centrifugal fan is running, sample the current speed of the alternating current motor (such as the actual speed R1 of the motor), and sample the current rotation direction of the alternating current motor (such as counterclockwise direction or clockwise direction).

[0043] The control unit is used for controlling the size and direction of the current in the annular current supply device 4 according to the current rotating speed of the AC motor and the target rotating speed of the AC motor, and in combination with the current rotating direction of the AC motor, so as to control the size and direction of the force of the centrifugal fan blade 3 in the magnetic field of the pair of permanent magnets 1, and to adjust the load of the AC motor, that is, to adjust the difference between the current rotating speed and the target rotating speed of the AC motor to a set error range, so as to stabilize the rotating speed of the AC motor.

[0044] The fan system of the square cabinet machine of the air conditioner provided in the scheme of the present application improves the rotating speed of the motor through the permanent magnets 1 arranged on both sides of the fan blade (such as the centrifugal fan blade 3) and the current supply wire arranged on the fan blade, and is suitable for the square cabinet machine and similar air conditioners. Figure 2 The exploded structural schematic view of the fan system of the square cabinet machine of the air conditioner is shown in FIG. 1. Figure 2 The exploded view of the fan system is shown in FIG. 2. Figure 2 The fan system shown in FIG. 3 includes the permanent magnets 1, the volute 2, the centrifugal fan blade 3, the annular current supply device 4, the motor 5, the brush 6 and the back plate 7.

[0045] The number of the permanent magnets 1 is two, and the two permanent magnets 1 are arranged on both sides (such as the left and right sides, the front and back sides, etc.) of the volute 2. The volute 2 cooperates with the centrifugal fan blade 3 to form the air inlet and outlet air duct of the square cabinet machine, and fixes the two permanent magnets 1. The annular current supply device 4 (such as an annular circuit) cooperates with the brush 6 to make the current enter from one side of the annular current supply device 4 and exit from the other side of the annular current supply device 4, so as to realize the current supply to both sides of the fan blade. The motor 5 and the brush 6 are fixed on the back plate 7 of the cabinet air conditioner and are electrified, and the circuit is linked to the main board (such as the main board of the motor controller) through the groove on the back plate 7. The back plate 7 is the back plate or the back panel of the cabinet air conditioner.

[0046] The rotating speed of the AC motor in the cabinet machine of the air conditioner is not stable, which causes the noise problem, the air volume change, affects the user experience comfort and increases the energy consumption of the whole machine. The fan system of the square cabinet machine of the air conditioner provided in the scheme of the present application arranges the permanent magnets 1 on both sides of the volute of the AC motor in the cabinet machine of the air conditioner, simultaneously arranges the circuit (such as the annular current supply device 4) on the centrifugal fan blade 3 in the cabinet machine of the air conditioner and electrifies it, controls the current direction of the annular current supply device 4, applies the forward and reverse force on the centrifugal fan blade 3, controls the current size of the annular current supply device 4, changes the force applied on the centrifugal fan blade 3, changes the load of the motor, adjusts and stabilizes the rotating speed of the motor, avoids the effect of the noise resonance point, and improves the use comfort of the user. The electromagnetic structure (such as the permanent magnet 1) in the scheme of the present application is arranged on the centrifugal fan blade 3, and the function is to stabilize the rotating speed of the motor and apply additional force to the motor, rather than actively adjust the rotating speed of the motor.

[0047] In some embodiments, the ring-shaped power supply device 4 comprises a power supply ring 41, a conductor rod 42 and a power supply bar 43.

[0048] In some embodiments, the number of the conductor rods 42 is the same as the number of the blades of the centrifugal fan blade 3, and each of the conductor rods 42 is fixedly arranged at the outer end of a corresponding blade of the centrifugal fan blade 3. The power supply ring 41 is arranged at the upper end of all the conductor rods 42 and has a ring-shaped structure. The number of the power supply bars 43 is the same as the number of the conductor rods 42. Each of the power supply bars 43 is arranged at the lower end of a corresponding conductor rod 42 and is spaced and insulated from the adjacent power supply bars 43. In the case where any of the power supply bars 43 is connected with one of the pair of brushes 6, the ring-shaped power supply device 4 is connected with the pair of brushes 6.

[0049] Specifically, Figure 3 The assembly structure of the fan blade, the ring-shaped power supply device and the brush is shown in the figure, wherein (a) is a schematic view of the overall assembly structure, and (b) is a partial enlarged view of part A in (a); Figure 4 The structure of the ring-shaped power supply device and the brush is shown in the figure, wherein (a) is a schematic view of the structure of the ring-shaped power supply device, and (b) is a schematic view of the structure of the brush. As shown in Figure 3 The assembly structure of the fan blade, the ring-shaped power supply device and the brush is shown in the figure, Figure 4 The structure of the ring-shaped power supply device and the brush is shown in the figure, wherein the ring-shaped power supply device 4 is arranged with the conductor rods 42 equal in number to the blades of the fan blade. Each of the conductor rods 42 is fixedly arranged at the outer end of a blade of the fan blade. The upper ends of the conductor rods 42 are connected with each other on the power supply ring 41. The lower ends of the conductor rods 42 are arranged with the power supply bars 43. Each of the conductor rods 42 is connected with one of the power supply bars 43. The adjacent power supply bars 43 are arranged with rubber or ceramic insulating materials, so that the different power supply bars 43 are not connected with each other.

[0050] In some embodiments, the pair of brushes 6 is symmetrically arranged. Each of the pair of brushes 6 has a U-shaped groove structure, and the U-shaped groove structure is arranged in the opposite direction to the rotation direction of the centrifugal fan blade 3, so that the pair of brushes 6 is connected with the ring-shaped power supply device 4, i.e., any of the power supply bars 43 rotating to any of the pair of brushes 6 is connected with the brush 6.

[0051] Specifically, see Figure 2 to Figure 4In the shown example, the energizing strips 43 are matched with the brushes 6, which are arranged in a U-shaped slot structure, and the U-shaped slot structure of the brushes 6 is counter-directed (i.e. chamfered) in the direction of rotation of the centrifugal fan blades 3, so that each energizing strip 43 can be more easily connected with the brush 6. The current direction of the annular energizing device 4 should be: the brush 6 on the same side - the energizing strip 43 on the same side - the conductor rod 42 on the same side - the energizing ring 41 on the upper part - the conductor rod 42 on the opposite side - the energizing strip 43 on the opposite side - the brush 6 on the opposite side. The conductor rod 42 and the energizing ring 41 are both used to connect the circuit and are matched with the structure of the fan blades.

[0052] In the scheme of the present application, the annular circuit, such as the annular energizing device 4, is arranged around the centrifugal fan blades 3 of the square cabinet air conditioner. Specifically, a circular conductor rod 42 is arranged on the outer side of each fan blade of the centrifugal fan, and an energizing ring 41 is arranged on the upper part of the conductor rod 42, and an energizing strip 43 (such as a short strip-shaped energizing strip 43) is arranged on the lower part of the conductor rod 42. The energizing rings 41 arranged on the upper parts of the conductor rods 42 on the outer sides of all the fan blades of the centrifugal fan are connected with each other, and the energizing strips 43 arranged on the lower parts of the conductor rods 42 on the outer sides of all the fan blades of the centrifugal fan are not connected with each other and are provided with an insulating layer between each energizing strip 43. On the upper surface of the back plate 7 on both sides (such as the left and right sides, the front and back sides, and the like), brushes 6 matched with the energizing strips 43 in the annular circuit arranged around the centrifugal fan blades 3 of the centrifugal fan are arranged.

[0053] The brushes 6 are connected with the main board circuit of the motor controller to connect the fan blade circuit (i.e. the annular circuit), and the current direction of the annular circuit should be: the brush 6 on the same side - the energizing strip 43 on the same side - the conductor rod 42 on the same side - the energizing ring 41 on the upper part - the conductor rod 42 on the opposite side - the energizing strip 43 on the opposite side - the brush 6 on the opposite side. By adjusting the size and direction of the current of the annular circuit, the size and direction of the force of the permanent magnets 1 on the two sides of the fan blades on the energizing conductor (such as the conductor rod 42) in the magnetic field thereof are adjusted, so as to change the load of the motor. Among them, the brushes 6 are fixed on the back plate 7, the annular circuit rotates with the fan blades, the left and right positions of the energizing strips 41 are connected with the brushes 6 for energization, so even if the fan blades rotate, the conductor rods 42 on the left and right sides are energized and stressed, and the size and direction of the stress of the annular energizing device 4 will not change with the rotation of the fan blades (such as Figure 6 ).

[0054] In some embodiments, the pair of permanent magnets 1 are symmetrically arranged; each permanent magnet 1 in the pair of permanent magnets 1 is vertically inserted from the square hole above the volute 2 and fixedly arranged, such as being fixedly arranged in the square hole of the volute 2 by the L-shaped fixing device and the triangular rib.

[0055] Figure 5 The assembly structure of the permanent magnet and the volute is shown in the schematic view.Figure 5 As an assembly diagram of the permanent magnet 1 and the volute 2, the permanent magnet 1 is vertically inserted from two square holes on the top of the volute 2. Symmetrical L-shaped fixing devices are arranged on the volute 2, and the L-shaped fixing devices are used for fixing the permanent magnet 1. Triangular ribs are arranged on two sides of the L-shaped fixing devices to strengthen the fixing of the permanent magnet 1.

[0056] Figure 6 As a force diagram of the fan blade, (a) is a first force diagram, and (b) is a second force diagram. Figure 7 As a current flow diagram, (a) is a first current flow diagram, and (b) is a second current flow diagram. Figure 6 As a force diagram of the fan blade, (a) is a first force diagram, and (b) is a second force diagram. Figure 7 As a current flow diagram, two permanent magnets 1 with opposite magnetic poles are arranged on two sides of the fan blade, and the permanent magnets 1 are used for exerting force on the centrifugal fan blade 3 by being electrified to the annular electrifying device 4 fixed on the centrifugal fan blade 3, so that the centrifugal fan blade 3 is exerted with force, and the load of the motor is changed.

[0057] According to the technical scheme of the present application, in the case that the indoor unit of the air conditioner is a cabinet machine (such as a square cabinet machine), a pair of permanent magnets (such as the permanent magnet 1) are symmetrically arranged on two sides of the volute of the alternating current motor in the centrifugal fan in the indoor fan, an annular electrifying device (such as the annular electrifying device 4) is arranged on the periphery of the fan blade of the centrifugal fan, a pair of brushes (such as the brush 6) are arranged on the back plate (such as the back plate 7) of the indoor unit, and the annular electrifying device is electrified with the brush when the annular electrifying device rotates with the fan blade to exert positive and negative forces on the fan blade. During the operation of the centrifugal fan, the size and direction of the current of the annular electrifying device are controlled according to the difference between the actual rotating speed and the target rotating speed of the alternating current motor, the size and direction of the force exerted on the fan blade are changed, the load of the alternating current motor is adjusted, and the noise resonance point of the alternating current motor is avoided. Thus, by arranging the annular electrifying device on the periphery of the fan blade in the indoor fan of the air conditioner, the size of the current of the annular electrifying device is adjusted according to the difference between the actual rotating speed and the target rotating speed of the motor to change the load of the motor, specifically, the size of the current of the annular electrifying device is adjusted to exert an additional force to interfere with the rotating speed of the indoor fan, the actual rotating speed of the motor can be closer to the required rotating speed, and the stability of the rotating speed of the motor is improved.

[0058] According to the embodiment of the present application, an air conditioner corresponding to the fan control device of the air conditioner is also provided. The air conditioner can include the fan control device of the air conditioner described above.

[0059] Since the processing and functions realized by the air conditioner of the present embodiment are basically corresponding to the embodiments, principles and examples of the device, the description of the present embodiment will not be described in detail, and the related description in the foregoing embodiments can be referred to, which will not be described herein.

[0060] The technical scheme of the present application, in the case of the indoor unit of the air conditioner being a cabinet machine (such as a square cabinet machine), a pair of permanent magnets (such as permanent magnet 1) are symmetrically arranged on both sides of the volute of the alternating current motor in the centrifugal fan in the indoor fan, an annular power supply device (such as annular power supply device 4) is arranged on the periphery of the fan blade of the centrifugal fan, a pair of brushes (such as brush 6) are arranged on the rear plate (such as rear plate 7) of the indoor unit, and the annular power supply device is powered with the brushes when the annular power supply device rotates with the fan blade to exert a forward and reverse force on the fan blade; during the operation of the centrifugal fan, the difference between the actual speed and the target speed of the alternating current motor is controlled to change the size and direction of the current of the annular power supply device, and the size and direction of the force exerted on the fan blade are changed to adjust the load of the alternating current motor to avoid the noise resonance point of the alternating current motor; thereby the actual speed of the motor gradually approaches the set speed, until the actual speed of the motor is within the allowable error range of the set speed, and the problem of unstable fan blade shaking speed in actual work can be improved.

[0061] According to the embodiments of the present application, a control method of a fan control device of an air conditioner corresponding to the air conditioner is also provided, as shown in the flowchart of an embodiment of the method of the present application. The control method of the fan control device of the air conditioner can include steps S110 to S120. Figure 12

[0062] At step S110, in the case of the operation of the centrifugal fan, the target speed (such as the target speed R of the motor) of the alternating current motor is sampled, the current speed (such as the actual speed R1 of the motor) of the alternating current motor is sampled, and the current rotation direction (such as counterclockwise or clockwise) of the alternating current motor is sampled.

[0063] At step S120, according to the current speed of the alternating current motor and the target speed of the alternating current motor, and in combination with the current rotation direction of the alternating current motor, the size and direction of the current in the annular power supply device 4 are controlled to control the size and direction of the force of the pair of permanent magnets 1 on the centrifugal fan blade 3 in its magnetic field, to adjust the load of the alternating current motor, i.e. to adjust the difference between the current speed and the target speed of the alternating current motor to be within the set error range, so as to stabilize the speed of the alternating current motor.

[0064] ​The application discloses a control scheme of a fan system of a square cabinet air conditioner, which is characterized in that permanent magnets 1 are arranged on the left and right sides of a volute of an alternating-current motor in the cabinet air conditioner, and a circuit (for example, a ring-shaped power supply device 4) is arranged on a centrifugal fan blade 3 in the cabinet air conditioner and is powered, the current direction of the ring-shaped power supply device 4 is controlled, the positive and negative forces are applied on the centrifugal fan blade 3, the current size of the ring-shaped power supply device 4 is controlled, the force applied on the centrifugal fan blade 3 is changed, the load of the motor is changed, the speed of the motor is adjusted and stabilized, the noise resonance point is avoided, and the use comfort of a user is improved.

[0065] In some embodiments, the specific process of controlling the size and direction of the current in the ring-shaped power supply device 4 according to the current speed of the alternating-current motor and the target speed of the alternating-current motor and in combination with the current rotating direction of the alternating-current motor is shown in the following example.

[0066] The following further illustrates the specific process of controlling the size and direction of the current in the ring-shaped power supply device 4 in step S120 by combining the flowchart of controlling the size and direction of the current in the ring-shaped power supply device 4 in the method of the application shown in Fig. 1, which includes steps S210 to S240. Figure 13 The following further illustrates the specific process of controlling the size and direction of the current in the ring-shaped power supply device 4 in step S120 by combining the flowchart of controlling the size and direction of the current in the ring-shaped power supply device 4 in the method of the application shown in Fig. 1, which includes steps S210 to S240.

[0067] In step S210, the absolute value of the difference between the target speed of the alternating-current motor and the current speed of the alternating-current motor is determined, which is recorded as the current speed absolute value difference of the alternating-current motor, for example, |target speed R-actual speed R1|.

[0068] In step S220, it is determined whether the current speed absolute value difference of the alternating-current motor is less than or equal to a set speed deviation threshold value, for example, ΔR.

[0069] In step S230, if it is determined that the current speed absolute value difference of the alternating-current motor is less than or equal to the set speed deviation threshold value, the alternating-current motor is controlled to maintain the current speed of the alternating-current motor.

[0070] Step S240, if the absolute value of the current speed difference of the AC motor is greater than the set speed deviation threshold, the current of the ring-shaped current device 4 is controlled according to the current speed of the AC motor and the target speed of the AC motor, and the size and direction of the current are combined with the current rotating direction of the AC motor, so as to correct the current speed of the AC motor and control the AC motor to operate at the corrected speed of the AC motor.

[0071] Figure 8 The structure diagram of the control module of the control ring-shaped current device is shown in the figure. Figure 8 As shown in the figure, the control module of the control ring-shaped current device 4 includes a signal transmitting module 101, a signal receiving module 102, a main control module 103 and a processing module 104. The signal receiving module 101, the signal transmitting module 102, the main control module 103 and the processing module 104 are used to change the load of the motor. The signal receiving module 101 and the signal transmitting module 102 are modules on the mainboard or program modules. The logic is to transmit the signal first, then receive the signal, then control, and finally process the signal.

[0072] Figure 9 The control flow diagram of the control module of the control ring-shaped current device is shown in the figure. Figure 9 As shown in the figure, the control flow of the control module of the control ring-shaped current device includes:

[0073] Step 11, when the system detects the wind deflector signal, the set speed value (i.e. target speed R) corresponding to the wind deflector is processed to make the motor operate at the target speed R, and then step 12 is executed.

[0074] Step 12, the control module detects the actual speed R1 of the motor in real time, and then step 13 is executed.

[0075] Step 13, determine whether ∣R-R1∣≤∆R is satisfied: if yes, the current control flow is ended, that is, when ∣R-R1∣≤∆R, it is determined that the speed of the motor is relatively stable and does not need to be corrected; otherwise, step 14 is executed to correct the speed of the motor, and then step 12 is returned to continue to detect the actual speed R1 of the motor. Wherein, ∆R is the actual required speed deviation value, such as 5 revolutions.

[0076] Step 14, when ∣R-R1∣>∆R, it is determined that the speed of the motor is greatly deviated from the set speed, and the speed needs to be corrected. Two speed correction modes are provided in the examples shown in Figure 10 and Figure 11

[0077] ​In some embodiments, step S240 involves controlling the magnitude and direction of the current in the annular energizing device 4 based on the current speed of the AC motor, the target speed of the AC motor, and the current rotation direction of the AC motor, in order to correct the current speed of the AC motor. This includes a first process of correcting the current speed of the AC motor when the current rotation direction of the AC motor is a preset first direction.

[0078] The following is combined with Figure 14 The schematic diagram shows an embodiment of the first process of correcting the current speed of the AC motor when the current rotation direction of the AC motor is a preset first direction in the method of the present invention. The specific process of correcting the current speed of the AC motor when the current rotation direction of the AC motor is a preset first direction in step S240 is further explained, including steps S310 to S320.

[0079] Step S310: If the current rotation direction of the AC motor is a preset first direction, determine whether the difference between the current speed of the AC motor and the target speed of the AC motor is greater than a set speed deviation threshold. The first direction is, for example, counterclockwise.

[0080] Step S320: If it is determined that the difference between the current speed of the AC motor and the target speed of the AC motor is greater than the set speed deviation threshold, then the magnitude and direction of the current in the annular energizing device 4 are controlled to be a preset first current. At this time, the current direction between the pair of permanent magnets 1 is from the N pole to the S pole; the direction of the preset first current is the same as the current direction between the pair of permanent magnets 1.

[0081] Specifically, Figure 10 This is a flowchart illustrating the first speed correction process (i.e., the speed correction 1 process). The first speed correction mode for the motor is shown below. Figure 10 The example shown. For example... Figure 10 As shown, the first speed correction process for the motor includes:

[0082] Step 21: If the AC motor rotates counterclockwise, determine whether R1-R > ∆R. If yes, proceed to step 22; otherwise, continue waiting in step 21.

[0083] Step 22: When the AC motor rotates counterclockwise, and R1-R>∆R is satisfied, output current I1 from the N pole of permanent magnet 1 to the S pole of permanent magnet 1 (the value of current I1 is set according to the preset value). At this time, the load of the motor will change. Then, execute step 23 to detect the actual speed R1 value in real time again.

[0084] In some embodiments, the step S240 of controlling the magnitude and direction of the current in the ring-shaped current supply device 4 according to the current rotational speed of the AC motor and the target rotational speed of the AC motor, and in combination with the current rotational direction of the AC motor, to correct the current rotational speed of the AC motor further comprises: a second process of correcting the current rotational speed of the AC motor in the case that the current rotational direction of the AC motor is a preset first direction.

[0085] The second process of correcting the current rotational speed of the AC motor in the case that the current rotational direction of the AC motor is a preset first direction in the method of the present application will be further explained below with reference to the flowchart of an embodiment of the second process of correcting the current rotational speed of the AC motor in the case that the current rotational direction of the AC motor is a preset first direction in the step S240. Figure 15 The second process of correcting the current rotational speed of the AC motor in the case that the current rotational direction of the AC motor is a preset first direction in the method of the present application will be further explained below with reference to the flowchart of an embodiment of the second process of correcting the current rotational speed of the AC motor in the case that the current rotational direction of the AC motor is a preset first direction in the step S240.

[0086] The step S410 comprises: after the magnitude of the preset first current is controlled, determining again whether the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is still greater than the set rotational speed deviation threshold value.

[0087] The step S420 comprises: if it is determined again that the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is still greater than the set rotational speed deviation threshold value, increasing the magnitude of the preset first current in a preset increasing manner and maintaining the direction of the preset first current unchanged, and then returning to continue determining again whether the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is still greater than the set rotational speed deviation threshold value.

[0088] The step S430 comprises: if it is determined again that the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is not greater than the set rotational speed deviation threshold value, determining whether the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is greater than the set rotational speed deviation threshold value.

[0089] The step S440 comprises: in the case that it is determined again that the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is not greater than the set rotational speed deviation threshold value, if it is determined that the difference between the target rotational speed of the AC motor and the current rotational speed of the AC motor is greater than the set rotational speed deviation threshold value, decreasing the magnitude of the preset first current in a preset decreasing manner and maintaining the direction of the preset first current unchanged, and then returning to continue determining again whether the difference between the current rotational speed of the AC motor and the target rotational speed of the AC motor is still greater than the set rotational speed deviation threshold value.

[0090] Step S450, in case that the difference between the current speed of the AC motor and the target speed of the AC motor is determined not to be greater than the set speed deviation threshold again, the size of the preset first current is maintained unchanged and the direction of the preset first current is maintained unchanged if the difference between the target speed of the AC motor and the current speed of the AC motor is determined not to be greater than the set speed deviation threshold.

[0091] Specifically, as shown in Figure 10 the first speed correction process of the motor further comprises:

[0092] Step 23, detecting the actual speed R1 value in real time, and then performing step 24.

[0093] Step 24, determining whether R1-R>△R is met: if yes, performing step 25, otherwise, performing step 26.

[0094] Step 25, when R1-R>△R, increasing the value of the current I1, and then returning to step 23 to continue detecting the actual speed R1 value in real time.

[0095] Step 26, determining whether R-R1>△R is met: if yes, performing step 27; otherwise, maintaining the value of the current I1 unchanged, that is, when |R-R1|≤△R, the value of the current I1 is maintained unchanged, and the process of this speed correction is ended.

[0096] Step 27, when R-R1>△R, decreasing the value of the current I1, and then returning to step 23 to continue detecting the actual speed R1 value in real time. In this way, it is ensured that |R-R1|≤△R is always maintained.

[0097] In some embodiments, the step S240 of controlling the size and direction of the current in the annular current device 4 according to the current speed of the AC motor and the target speed of the AC motor, and in combination with the current rotation direction of the AC motor, to correct the current speed of the AC motor further comprises: a first process of correcting the current speed of the AC motor in case that the current rotation direction of the AC motor is a preset second direction.

[0098] The following will be further described in combination with Figure 16 the embodiment flow diagram of the first process of correcting the current speed of the AC motor in case that the current rotation direction of the AC motor is a preset second direction in the method of the application as shown in the figure, to further illustrate the specific process of the first process of correcting the current speed of the AC motor in case that the current rotation direction of the AC motor is a preset second direction in the step S240, which comprises steps S510 to S520.

[0099] Step S510, in the case that the current rotation direction of the AC motor is a preset second direction, determine whether the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is greater than a set rotating speed deviation threshold. Wherein, the second direction is, for example, a clockwise direction.

[0100] Step S520, if it is determined that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is greater than the set rotating speed deviation threshold, control the size and direction of the current in the ring-shaped current device 4 to be a preset second current, at this time, the current direction between the pair of permanent magnets 1 is from S pole to N pole; the direction of the preset second current is the same as the current direction between the pair of permanent magnets 1.

[0101] Specifically, Figure 11 is a flowchart of the second rotating speed correction process (i.e., the process of rotating speed correction 2), and the second rotating speed correction mode of the motor is shown in the example of Figure 10 As shown in Figure 11 , the second rotating speed correction process of the motor includes:

[0102] Step 31, in the case that the rotating direction of the AC motor is a clockwise rotating direction, determine whether R-R1>∆R is satisfied: if yes, execute step 32, otherwise continue to wait in step 31. Wherein, when the direction of the rotating speed of the AC motor is clockwise, applying a counterclockwise force makes the rotating speed of the AC motor decelerate, applying a clockwise force makes the rotating speed of the AC motor accelerate, the applied force is irrelevant to whether the direction of the rotating speed of the motor is clockwise or counterclockwise, and is only related to the difference between the actual rotating speed and the demand rotating speed.

[0103] Step 32, in the case that the rotating direction of the AC motor is a counterclockwise rotating direction, when R1-R>∆R is satisfied, the current I2 from the S pole of the permanent magnet 1 to the N pole of the permanent magnet 1 (the value of the current I2 is set according to a preset value), at this time the load of the motor will change, and then step 33 is executed to detect the actual rotating speed R1 value again in real time.

[0104] In some embodiments, in step S240, according to the current rotating speed of the AC motor and the target rotating speed of the AC motor, and in combination with the current rotating direction of the AC motor, the size and direction of the current in the ring-shaped current device 4 are controlled to correct the current rotating speed of the AC motor, and the second process of correcting the current rotating speed of the AC motor in the case that the current rotating direction of the AC motor is a preset second direction is further included.

[0105] The following will be described in combination with Figure 17Fig. 6 shows an embodiment flowchart of the second process of correcting the current rotating speed of the AC motor in the method of the present application in the case that the current rotating direction of the AC motor is the preset second direction, which further illustrates the specific process of the second process of correcting the current rotating speed of the AC motor in the case that the current rotating direction of the AC motor is the preset second direction in step S240, comprising steps S610-S650.

[0106] Step S610, after the size and direction of the current in the annular current conducting device 4 are controlled to be the preset second current, it is determined again whether the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is still greater than the set rotating speed deviation threshold value.

[0107] Step S620, if it is determined again that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is still greater than the set rotating speed deviation threshold value, the size of the preset second current is increased in a preset increasing manner, and the direction of the preset second current is maintained unchanged, and then it is returned to continue to determine again whether the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is still greater than the set rotating speed deviation threshold value.

[0108] Step S630, if it is determined again that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is not greater than the set rotating speed deviation threshold value, it is determined whether the difference between the current rotating speed of the AC motor and the target rotating speed of the AC motor is greater than the set rotating speed deviation threshold value.

[0109] Step S640, in the case that it is determined again that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is not greater than the set rotating speed deviation threshold value, if it is determined that the difference between the current rotating speed of the AC motor and the target rotating speed of the AC motor is greater than the set rotating speed deviation threshold value, the size of the preset second current is decreased in a preset decreasing manner, and the direction of the preset second current is maintained unchanged, and then it is returned to continue to determine again whether the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is still greater than the set rotating speed deviation threshold value.

[0110] Step S650, in the case that it is determined again that the difference between the target rotating speed of the AC motor and the current rotating speed of the AC motor is not greater than the set rotating speed deviation threshold value, if it is determined that the difference between the current rotating speed of the AC motor and the target rotating speed of the AC motor is not greater than the set rotating speed deviation threshold value, the size of the preset second current is maintained unchanged, and the direction of the preset second current is maintained unchanged.

[0111] Specifically, as Figure 11As shown, the second rotating speed correction process of the motor further includes:

[0112] Step 33, detecting the actual rotating speed R1 value in real time, and then executing step 34.

[0113] Step 34, judging whether R-R1>AR is satisfied: if yes, executing step 35, otherwise executing step 36.

[0114] Step 35, when R-R1>AR, increasing the value of the current I2, and then returning to step 33 to continue detecting the actual rotating speed R1 value in real time.

[0115] Step 36, judging whether R1-R>AR is satisfied: if yes, executing step 37; otherwise, maintaining the value of the current I2 unchanged, i.e. when |R-R1|≤AR, maintaining the value of the current I2 unchanged, and the process of this rotating speed correction is ended.

[0116] Step 37, when R1-R>AR, decreasing the value of the current I2, and then returning to step 33 to continue detecting the actual rotating speed R1 value in real time. In this way, it is guaranteed that |R-R1|≤AR is always maintained.

[0117] The value of the current I1 and the value of the current I2 are both changed from 0, such as gradually changing according to the set frequency and the set amplitude. For example, if the set rotating speed of the motor is 500 revolutions, and the actual rotating speed of the motor is only 480 revolutions, then the current of the annular current supply device 4 needs to be gradually increased until the actual rotating speed of the motor is equal to the preset rotating speed. The current from the N pole of the permanent magnet 1 to the S pole of the permanent magnet 1 is the current I1, and the current from the S pole of the permanent magnet 1 to the N pole of the permanent magnet 1 is the current I2, which are both currents of the annular current supply device 4, only the directions of the currents are different. If the difference between the actual rotating speed of the motor and the set rotating speed is large, then the situation that the rotating speed of the motor is unstable due to the shaking of the fan blade is more serious. Therefore, the current of the annular current supply device 4 is increased to exert a greater force on the centrifugal fan blade 3 to suppress the shaking of the fan blade, so as to change the load of the motor by exerting a force on the centrifugal fan blade 3. In the case that the motor outputs the same size of force, exerting a reverse force on the fan blade is equivalent to increasing the load of the motor, and vice versa.

[0118] The scheme of the present application realizes the energization of the annular energizing device 4 during the movement of the centrifugal fan blade 3 by arranging permanent magnets 1 on both sides of the centrifugal fan blade 3, arranging the annular energizing device 4 on the periphery of the fan blade, and cooperating with the brush 6 fixed on the back plate 7. The energization position of the annular energizing device 4 is always the same position of the conductor rod 42, which can ensure that the force received by the fan blade is completely the same in size and direction under the condition of the same current, that is, the stability of the fan blade can be maintained. In actual work, when the rotating speed of the motor fluctuates due to some reasons (such as unstable voltage), the actual rotating speed of the motor can be detected, and the difference between the actual rotating speed and the set rotating speed is adjusted by a preset program to adjust the current passing through the annular energizing device 4, change the size and direction of the force received, and gradually make the actual rotating speed of the motor close to the set rotating speed until the actual rotating speed of the motor is within the allowable range of the set rotating speed. Moreover, the problem of unstable rotating speed caused by fan blade shaking in actual work can be improved.

[0119] Since the processing and functions realized by the method of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the air conditioner, the description of the present embodiment will not be elaborated, and the related description in the foregoing embodiments can be referred to, which will not be repeated here.

[0120] By adopting the technical scheme of the present embodiment, in the case that the indoor unit of the air conditioner is a cabinet machine (such as a square cabinet machine), a pair of permanent magnets (such as permanent magnets 1) are symmetrically arranged on both sides of the volute of the alternating current motor in the centrifugal fan in the indoor fan, an annular energizing device (such as annular energizing device 4) is arranged on the periphery of the fan blade of the centrifugal fan, a pair of brushes (such as brushes 6) are arranged on the back plate (such as back plate 7) of the indoor unit, and the annular energizing device is energized with the brushes when the annular energizing device rotates with the fan blade to exert a forward and reverse force on the fan blade. During the operation of the centrifugal fan, the difference between the actual rotating speed and the target rotating speed of the alternating current motor is used to control the size and direction of the current of the annular energizing device, change the size and direction of the force exerted on the fan blade, and adjust the load of the alternating current motor to avoid the noise resonance point of the alternating current motor. Thus, by changing the load of the motor, the rotating speed of the motor is adjusted and stabilized, the noise resonance point is avoided, and the use comfort of the user is improved.

[0121] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0122] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A fan control device for an air conditioner, characterized in that, The air conditioner has an indoor unit; the indoor unit has a centrifugal fan, the centrifugal fan has an AC motor and a centrifugal fan blade (3); a pair of permanent magnets (1) with opposite magnetic poles are arranged on the volute of the AC motor; the air conditioner's fan control device includes: an annular energizing device (4), a sampling unit and a control unit; the annular energizing device (4) is located around the centrifugal fan blade (3) and can rotate with the centrifugal fan blade (3); a pair of brushes (6) are provided on the rear plate (7) of the indoor unit; when the annular energizing device (4) is connected to the pair of brushes (6), current flows through the annular energizing device (4); The annular energizing device (4) includes: an energizing ring (41), conductor rods (42), and energizing strips (43); wherein, the number of conductor rods (42) is the same as the number of blades of the centrifugal fan (3), and each conductor rod (42) is fixedly disposed at the outer end of a corresponding blade of the centrifugal fan (3); the energizing ring (41) is disposed at the upper end of all the conductor rods (42) and has an annular structure; The number of the energizing strips (43) is the same as the number of the conductor rods (42); each energizing strip (43) is disposed at the lower end of a corresponding conductor rod (42) and is spaced apart and insulated from the adjacent energizing strips (43); when any energizing strip (43) is connected to one of the brushes (6) in the pair of brushes (6), the annular energizing device (4) is connected to the pair of brushes (6); in, The sampling unit is used to sample the target speed of the AC motor, the current speed of the AC motor, and the current rotation direction of the AC motor when the centrifugal fan is running. The control unit is used to control the magnitude and direction of the current in the annular energizing device (4) according to the current speed of the AC motor, the target speed of the AC motor, and the current rotation direction of the AC motor, so as to control the magnitude and direction of the force exerted by the pair of permanent magnets (1) on the centrifugal fan blades (3) in their magnetic field, thereby adjusting the load of the AC motor.

2. The air conditioner fan control device according to claim 1, characterized in that, in, The pair of brushes (6) are symmetrically arranged; each of the pair of brushes (6) has a U-shaped groove structure, and the U-shaped groove structure is reversed in the rotation direction of the centrifugal fan (3) so that the pair of brushes (6) are connected to the annular power supply device (4); And / or, The pair of permanent magnets (1) are symmetrically arranged; each of the pair of permanent magnets (1) is vertically inserted into and fixedly arranged through the square hole above the volute (2).

3. An air conditioner, characterized in that, include: The fan control device for an air conditioner as described in any one of claims 1 to 2.

4. A control method for the fan control device of an air conditioner as described in claim 3, characterized in that, include: When the centrifugal fan is running, the target speed of the AC motor is sampled, the current speed of the AC motor is sampled, and the current rotation direction of the AC motor is sampled. Based on the current speed and target speed of the AC motor, and combined with the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled to control the magnitude and direction of the force exerted by the pair of permanent magnets (1) on the centrifugal fan blades (3) in their magnetic field, thereby adjusting the load of the AC motor.

5. The control method of the air conditioner fan control device according to claim 4, characterized in that, Based on the current speed and target speed of the AC motor, and in conjunction with the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled, including: The absolute value of the difference between the target speed of the AC motor and the current speed of the AC motor is determined and denoted as the absolute value of the difference between the current speed of the AC motor. Determine whether the absolute value of the current speed difference of the AC motor is less than or equal to a set speed deviation threshold; If it is determined that the absolute value of the current speed difference of the AC motor is less than or equal to the set speed deviation threshold, then the AC motor is controlled to maintain the current speed of the AC motor. If it is determined that the absolute value of the current speed difference of the AC motor is greater than the set speed deviation threshold, then based on the current speed of the AC motor, the target speed of the AC motor, and the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled to correct the current speed of the AC motor and control the AC motor to run at the corrected speed.

6. The control method of the air conditioner fan control device according to claim 5, characterized in that, Based on the current speed and target speed of the AC motor, and in conjunction with the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled to correct the current speed of the AC motor, including: When the current rotation direction of the AC motor is a preset first direction, determine whether the difference between the current speed of the AC motor and the target speed of the AC motor is greater than a set speed deviation threshold. If it is determined that the difference between the current speed of the AC motor and the target speed of the AC motor is greater than the set speed deviation threshold, then the magnitude and direction of the current in the ring energizing device (4) are controlled to be the preset first current. At this time, the current direction between the pair of permanent magnets (1) is from the N pole to the S pole; the direction of the preset first current is the same as the current direction between the pair of permanent magnets (1).

7. The control method of the air conditioner fan control device according to claim 6, characterized in that, Based on the current speed and target speed of the AC motor, and in conjunction with the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled to correct the current speed of the AC motor, and the method further includes: After controlling the magnitude and direction of the current in the ring-shaped energizing device (4) to a preset first current, it is determined again whether the difference between the current speed of the AC motor and the target speed of the AC motor is still greater than the set speed deviation threshold. If it is determined again that the difference between the current speed of the AC motor and the target speed of the AC motor is still greater than the set speed deviation threshold, then the magnitude of the preset first current is increased in a preset increase manner, and the direction of the preset first current remains unchanged. If it is determined again that the difference between the current speed of the AC motor and the target speed of the AC motor is not greater than the set speed deviation threshold, then it is determined whether the difference between the target speed of the AC motor and the current speed of the AC motor is greater than the set speed deviation threshold. If it is determined that the difference between the target speed of the AC motor and the current speed of the AC motor is greater than the set speed deviation threshold, then the magnitude of the preset first current is reduced in a preset reduction manner, while the direction of the preset first current remains unchanged. If it is determined that the difference between the target speed of the AC motor and the current speed of the AC motor is not greater than the set speed deviation threshold, then the magnitude of the preset first current and the direction of the preset first current are kept unchanged.

8. The control method of the air conditioner fan control device according to claim 5, characterized in that, Based on the current speed and target speed of the AC motor, and in conjunction with the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled to correct the current speed of the AC motor, and the method further includes: When the current rotation direction of the AC motor is a preset second direction, determine whether the difference between the target speed of the AC motor and the current speed of the AC motor is greater than a set speed deviation threshold. If the difference between the target speed of the AC motor and the current speed of the AC motor is determined to be greater than the set speed deviation threshold, then the magnitude and direction of the current in the ring energizing device (4) are controlled to be the preset second current. At this time, the current direction between the pair of permanent magnets (1) is from the S pole to the N pole; the direction of the preset second current is the same as the current direction between the pair of permanent magnets (1).

9. The control method of the air conditioner fan control device according to claim 8, characterized in that, Based on the current speed and target speed of the AC motor, and in conjunction with the current rotation direction of the AC motor, the magnitude and direction of the current in the annular energizing device (4) are controlled to correct the current speed of the AC motor, and the method further includes: After controlling the magnitude and direction of the current in the ring-shaped energizing device (4) to a preset second current, it is determined again whether the difference between the target speed of the AC motor and the current speed of the AC motor is still greater than the set speed deviation threshold. If it is determined again that the difference between the target speed of the AC motor and the current speed of the AC motor is still greater than the set speed deviation threshold, then the magnitude of the preset second current is increased in a preset increase manner, while the direction of the preset second current remains unchanged. If it is determined again that the difference between the target speed of the AC motor and the current speed of the AC motor is not greater than the set speed deviation threshold, then it is determined whether the difference between the current speed of the AC motor and the target speed of the AC motor is greater than the set speed deviation threshold. If it is determined that the difference between the current speed of the AC motor and the target speed of the AC motor is greater than the set speed deviation threshold, then the magnitude of the preset second current is reduced in a preset reduction manner, while the direction of the preset second current remains unchanged. If it is determined that the difference between the current speed of the AC motor and the target speed of the AC motor is not greater than the set speed deviation threshold, then the preset magnitude of the second current and the preset direction of the second current are maintained unchanged.

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