Cross-flow fan, air conditioner and control method thereof

Abstract

The application provides a cross-flow fan, an air conditioner and a control method thereof. The cross-flow fan comprises a driving component, a cross-flow fan blade and a magnetic suspension bearing. One end of the cross-flow fan blade is connected with the driving component, the other end of the cross-flow fan blade has a rotating shaft, the rotating shaft has magnetism, the magnetic suspension bearing is sleeved outside the rotating shaft, the magnetic suspension bearing comprises a stator core and a plurality of coil groups, the stator core has a plurality of pole column units, each pole column unit is distributed at intervals along the circumference of the stator core, and each coil group is wound around each pole column unit. According to the application, the magnetic suspension bearing suspends the cross-flow fan blade away from the one end of the driving component in the air through controllable magnetic field force, realizes high-speed operation of the rotating structure and the stationary structure without contact, eliminates the friction between the cross-flow fan blade and the surrounding components during operation, greatly reduces the noise generated during the operation of the cross-flow fan, and improves the mute performance of the air conditioner indoor unit and the service life of the cross-flow fan blade and other components.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a cross-flow fan, an air conditioner, and a control method thereof. Background Technology

[0002] With the continuous development of my country's economy, people's pursuit of comfortable and healthy living environments is also increasing. Furthermore, with the continuous maturation and advancement of household air conditioning technology, the market and users are no longer limited to cooling and heating capacity; they are also placing higher demands on the size, appearance, air cleanliness, noise level, and durability of air conditioners. Split-type air conditioner indoor units are mostly installed in users' bedrooms, living rooms, offices, and other similar settings. Their size directly affects the space utilization and aesthetics of the application environment, and the air cleanliness and noise level of the air conditioner directly affect the comfort and experience of users in these environments, especially during prolonged use of air conditioning or while sleeping in a bedroom. Magnetic levitation bearings are high-performance bearings that use a controllable magnetic field to suspend the rotor without mechanical friction (non-contact). Magnetic levitation bearings have advantages such as no friction, no wear, no need for lubrication and sealing, low cost, low loss, low noise, and long lifespan. Therefore, they have broad application prospects in both high-speed, low-speed, high-cleanliness, and low-noise applications. Therefore, applying a magnetic levitation bearing system to the fan blade assembly of an air conditioner split unit enables frictionless operation between the moving and stationary parts of the fan blade assembly. This reduces the immediate load on the split unit's drive system. Based on this, by appropriately increasing the drive component speed and reducing the volume of the split unit's cross-flow fan blades, the goal of miniaturizing the air conditioner's indoor unit can be achieved without reducing the indoor unit's airflow or increasing the power consumption of the drive components. This approach also eliminates wear on the fan blades during long-term high-speed operation, avoids the use of lubricating oil in the indoor unit, and significantly improves the performance, lifespan, airflow cleanliness, and noise reduction of the split unit's fan blade assembly.

[0003] Therefore, this invention proposes a miniaturized, frictionless split-type air conditioner fan blade assembly and its control logic. This assembly consists of a brushless DC drive component, a miniaturized cross-flow fan blade, a magnetic levitation bearing, and sensors, among other related components. In split-type air conditioners, conventional fan blade assemblies have a large volume, and one end of the cross-flow fan blade is fixed in a plastic structural component. When the fan blade rotates at high speed, the fixed shaft of the cross-flow fan blade generates severe friction with the stationary structural component, which to some extent increases the load on the drive component, reduces airflow, and causes significant structural wear and noise. Existing split-type air conditioners often use a large amount of lubricating material on the fixed shaft to reduce fan blade friction, which easily leads to a decrease in airflow cleanliness. This invention proposes to miniaturize the cross-flow fan blade, reducing its volume and weight, and incorporating a magnetic levitation bearing at its fixed end to achieve frictionless operation between the moving and stationary structures. This reduces component wear and noise caused by friction, improves the service life of related components and the quietness of the indoor unit, and avoids the use of lubricating oil, thus improving the cleanliness of the outlet air. Based on this, the rotation speed of the fan blade assembly can be further increased to maintain the indoor unit's airflow without decreasing. Summary of the Invention

[0004] Therefore, the present invention provides a cross-flow fan that can solve the technical problem that when the cross-flow fan in the existing air conditioner rotates at high speed, the fixed shaft of the cross-flow fan blades and the stationary structural components generate severe friction, which increases the load on the drive components, reduces the air volume, and causes a lot of structural wear and noise.

[0005] To address the aforementioned problems, this invention provides a cross-flow fan, comprising: a drive component, a cross-flow impeller, and a magnetic levitation bearing. One end of the cross-flow impeller is connected to the drive component, and the other end of the cross-flow impeller has a rotating shaft. The rotating shaft is magnetic, and the magnetic levitation bearing is sleeved on the outside of the rotating shaft. The magnetic levitation bearing includes a stator core and multiple coil groups. The stator core has multiple pole units, and each pole unit is distributed circumferentially along the stator core. Each coil group is wound around each pole unit.

[0006] In some embodiments, the pole unit includes a plurality of poles, each pole being spaced apart along the axial direction of the stator core, and the coil group includes a plurality of coils, each coil being wound on each pole.

[0007] In some embodiments, a shaft support is connected to the inner wall of the stator core, which supports the rotating shaft when the magnetic levitation bearing is de-energized.

[0008] In some embodiments, the shaft support is made of a non-magnetic material.

[0009] In some embodiments, the shaft support includes a support body and a carrier body, the carrier body being connected to the inner wall of the stator core via the support body, the carrier body being arc-shaped, and the concave surface of the carrier body facing the rotating shaft.

[0010] In some embodiments, the carrier is provided with a plurality of spaced grooves, each of which penetrates the carrier.

[0011] The present invention also provides an air conditioner including the aforementioned cross-flow fan.

[0012] The present invention also provides a control method for an air conditioner, used to control the operation of the aforementioned air conditioner, wherein the magnetic levitation bearing has a first region, a second region, a third region, and a fourth region sequentially connected along its circumference, the first region being opposite to the third region, the second region being opposite to the fourth region, and the control method comprising:

[0013] Start-up procedure: Turn on the air conditioner;

[0014] Acquisition Steps: Obtain the position coordinates (X) of the rotating shaft. n Y m );

[0015] Determine the execution steps; based on the X n The voltage magnitude corresponding to each coil group in the first and third regions is controlled according to the relationship between L1, L2, L3, and L4; based on the Y... m The magnitudes of H1, H2, H3, and H4 are used to control the voltage magnitudes of each coil group in the second and fourth regions; where L1 is the value corresponding to the first target point on the X-axis, L2 is the value corresponding to the second target point on the X-axis, L3 is the value corresponding to the third target point on the X-axis, L4 is the value corresponding to the fourth target point on the X-axis, H1 is the value corresponding to the first target point on the Y-axis, H2 is the value corresponding to the second target point on the Y-axis, H3 is the value corresponding to the third target point on the Y-axis, and H4 is the value corresponding to the fourth target point on the Y-axis.

[0016] In some implementations, when L1≤X n When L2 ≤ X, the voltage corresponding to each coil group in the first region is controlled to be P1, and the voltage corresponding to each coil group in the third region is controlled to be P2; or, when L2 < X n When L3 < X, the voltage corresponding to each coil group in the first region and the voltage corresponding to each coil group in the third region are both P3; or, when L3 ≤ X nWhen L1 < L2 < L3 < L4, the voltage corresponding to each coil group in the first region is controlled to be P2, and the voltage corresponding to each coil group in the third region is controlled to be P1; wherein, L1 < L2 < L3 < L4, P2 < P3 < P1.

[0017] In some implementations, when H1≤Y m When H2 ≤ Y, the voltage corresponding to each coil group in the second region is controlled to be T1, and the voltage corresponding to each coil group in the fourth region is controlled to be T2; or, when H2 < Y m When H3 < Y, the voltage corresponding to each coil group in the second region and the voltage corresponding to each coil group in the fourth region are both T3; or, when H3 ≤ Y m When H1 < H2 < H3 < H4, the voltage corresponding to each coil group in the second region is controlled to be T2, and the voltage corresponding to each coil group in the fourth region is controlled to be T1; wherein, H1 < H2 < H3 < H4, T2 < T3 < T1.

[0018] The present invention provides a cross-flow fan, an air conditioner, and a control method thereof, which have the following beneficial effects:

[0019] This application utilizes a magnetic levitation bearing at the end of the cross-flow fan blade furthest from the drive component. The magnetic levitation bearing suspends this end of the fan blade in mid-air via a controllable magnetic field, achieving high-speed, contactless operation between the rotating and stationary structures. This allows for miniaturization of the air conditioner's split-type indoor unit while maintaining a constant airflow. Furthermore, by eliminating friction between the cross-flow fan blade and surrounding components, noise generated during operation is significantly reduced, as is wear and tear on other parts, improving the quietness of the indoor unit and extending the lifespan of components such as the cross-flow fan blade. Simultaneously, the absence of contact between the fan blade's shaft and the magnetic levitation bearing eliminates the need for lubricating oil, thereby improving the cleanliness of the air exiting the air from the split-type indoor unit. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a cross-flow fan according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the cross-flow fan blades of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the cross-flow fan according to an embodiment of the present invention, in which the magnetic levitation bearing is sleeved on the outside of the rotating shaft.

[0024] Figure 4 This is a front view of the magnetic levitation bearing of the cross-flow fan according to an embodiment of the present invention, with the bearing sleeved on the outside of the rotating shaft.

[0025] Figure 5 This is a control logic diagram of an air conditioner from power-on to power-off process according to an embodiment of the present invention.

[0026] Figure 6 This is a control logic diagram for correcting the shaft position of the magnetic levitation bearing in a cross-flow fan according to an embodiment of the present invention.

[0027] The reference numerals in the attached figures are as follows:

[0028] 1. Drive component; 2. Cross-flow fan blade; 3. Magnetic levitation bearing; 31. Stator core; 32. Coil; 33. Support body; 34. Bearing body; 35. Mounting bracket; 4. Rotating shaft; 5. Groove; 6. First area; 7. Second area; 8. Third area; 9. Fourth area. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0033] See also Figures 1 to 6 As shown, according to an embodiment of the present invention, a cross-flow fan is provided, comprising: a drive component 1, a cross-flow fan blade 2, and a magnetic levitation bearing 3. One end of the cross-flow fan blade 2 is connected to the drive component 1, and the other end of the cross-flow fan blade 2 has a rotating shaft 4. The magnetic levitation bearing 3 is sleeved on the outside of the rotating shaft 4. The magnetic levitation bearing 3 includes a stator core 31 and multiple coil groups. The stator core has multiple pole units, and each pole unit is distributed at intervals along the circumference of the stator core 31. Each coil group is wound on each pole unit.

[0034] In this technical solution, a magnetic levitation bearing 3 is installed at the end of the cross-flow fan 2 furthest from the drive component 1. The magnetic levitation bearing 3 suspends the end of the cross-flow fan 2 furthest from the drive component 1 in the air through a controllable magnetic field, achieving high-speed operation of the rotating and stationary structures without contact. This allows for miniaturization of the air conditioner's split-type indoor unit while maintaining a constant airflow. Furthermore, by eliminating friction between the cross-flow fan 2 and surrounding components during operation, the noise generated by the cross-flow fan and wear between it and other parts are significantly reduced, improving the quietness of the air conditioner's indoor unit and extending the service life of components such as the cross-flow fan 2. Simultaneously, the fact that the rotating shaft 4 of the cross-flow fan 2 does not contact the magnetic levitation bearing 3 avoids the use of lubricating oil, thereby improving the cleanliness of the air outlet from the air conditioner's split-type indoor unit. The drive component 1 can be a motor. Although one end of the cross-flow fan 2 is rigidly connected to the drive component 1, the cross-flow fan 2 can move within a small range of vertical and horizontal directions relative to the drive component 1. Therefore, this does not affect the positional correction of the rotating shaft 4 of the cross-flow fan 2 within the magnetic levitation bearing 3. It is understandable that miniaturization of the split-type indoor unit of the air conditioner means that: since the cross-flow fan blade 2 of this application can rotate without friction, the cross-flow fan blade 2 of this application rotates faster than the cross-flow fan blade 2 of the prior art. While maintaining the same air volume, the cross-flow fan blade 2 of this application can be made shorter in the axial direction, thereby making the split-type indoor unit of the air conditioner smaller.

[0035] See Figure 3 As shown, the pole unit includes multiple poles, which are spaced apart along the axial direction of the stator core 31. The coil group includes multiple coils 32, each coil 32 being wound around a pole. This is equivalent to having coils 32 distributed both circumferentially and axially along the stator core 31, which allows for the application of a longer electromagnetic force along the axial direction to the rotating shaft 4 of the cross-flow fan 2. Furthermore, the electromagnetic force is more uniform, resulting in better levitation control of the rotating shaft 4.

[0036] See Figure 3 As shown, a shaft support is connected to the inner wall of the stator core 31. When the cross-flow fan is not running, that is, when the magnetic levitation bearing 3 is de-energized, the rotating shaft 4 of the cross-flow fan blade 2 rests on the shaft support. This ensures that the cross-flow fan blade 2 is subjected to balanced forces at both ends when it is not working, and also ensures that the drive component 1 connected to it is subjected to balanced forces, preventing deformation and damage to the cross-flow fan blade 2 and the drive component 1 under uneven forces. When the air conditioner is turned on, the current passes through the coils 32 of the magnetic levitation bearing 3 to generate electromagnetic force, suspending the rotating shaft 4 of the cross-flow fan blade 2, thereby achieving contactless operation between the moving and stationary structures.

[0037] As a specific implementation method, the shaft support is made of a non-magnetic material, which can prevent the shaft support from generating magnetism, thereby preventing the shaft support from interfering with the normal levitation of the magnetic levitation bearing 3 on the rotating shaft 4.

[0038] See Figure 3 As shown, the shaft support includes a support body 33 and a bearing body 34. The bearing body 34 is connected to the inner wall of the stator core 31 through the support body 33. The bearing body 34 is arc-shaped, and the concave surface of the bearing body 34 faces the rotating shaft 4.

[0039] In this embodiment, the arc-shaped support body 34 effectively limits the rotation shaft 4, preventing it from rolling off the support body 34 when stationary, and preventing excessive horizontal displacement of the rotation shaft 4 when the magnetic levitation bearing 3 is energized. More importantly, the arc shape of the support body 34 ensures that the rotation shaft 4 is always at the lowest point of the concave surface of the support body 34 when stationary, thus further ensuring balanced force on both ends of the cross-flow fan blade 2. Preferably, the left and right parts of the support body 34 are symmetrical with respect to the support body 33.

[0040] See Figure 3 As shown, the support body 34 has multiple spaced grooves 5, each groove 5 penetrating the support body 34.

[0041] In this technical solution, by constructing multiple through grooves 5 on the carrier 34, the magnetic lines of force of the magnetic levitation bearing 3 can pass through the carrier 34 and act on the rotating shaft 4 more conveniently, so that the magnetic levitation bearing 3 can better control the rotating shaft 4.

[0042] Specifically, the stator core 31 is also provided with a mounting bracket 35, and the magnetic levitation bearing 3 is installed in the indoor unit of the air conditioner through the mounting bracket 35.

[0043] The present invention also provides an air conditioner including the aforementioned cross-flow fan.

[0044] The present invention also provides a control method for an air conditioner, used to control the operation of the aforementioned air conditioner. The magnetic levitation bearing 3 has a first region 6, a second region 7, a third region 8, and a fourth region 9 connected sequentially along its circumference. The first region 6 is opposite to the third region 8, and the second region 7 is opposite to the fourth region 9. The control method includes:

[0045] Start-up procedure: Turn on the air conditioner;

[0046] Steps to obtain: Obtain the position coordinates (X) of pivot 4. n Y m );

[0047] Determine the execution steps; based on X n The relationship between the values ​​of L1, L2, L3, and L4 controls the voltage magnitude of each coil group within the first region 6 and the third region 8; based on Y... mThe relationship between the values ​​of H1, H2, H3, and H4 controls the voltage magnitude of each coil group within the second region 7 and the fourth region 9. Here, L1 is the value corresponding to the first target point on the X-axis, L2 is the value corresponding to the second target point on the X-axis, L3 is the value corresponding to the third target point on the X-axis, L4 is the value corresponding to the fourth target point on the X-axis, H1 is the value corresponding to the first target point on the Y-axis, H2 is the value corresponding to the second target point on the Y-axis, H3 is the value corresponding to the third target point on the Y-axis, and H4 is the value corresponding to the fourth target point on the Y-axis.

[0048] In this technical solution, the core of stable operation of the air conditioner's cross-flow fan lies in the high-precision output and control of the electromagnetic coil's current. This process involves the precise detection of the shaft position 4, which converts the position signal into a voltage control signal and an algorithm for setting the coil current value. See [link to technical details]. Figure 4 As shown, a coordinate system is established with any point on the axis of the stator core 31 of the magnetic levitation bearing 3 as the origin. When the magnetic levitation bearing 3 is not energized, and the rotating shaft 4 is stationary on the shaft support, the center point of the rotating shaft 4 corresponds to the origin of the coordinate system. When the magnetic levitation bearing 3 is energized, the position of the rotating shaft 4 will change under the action of electromagnetic force. The cross-flow fan also includes a position sensor for detecting the position of the rotating shaft 4. The position sensor acquires the position coordinates (X, Y, X) of the rotating shaft 4 at 0.1s intervals. n Y m Based on the detection data from the position sensors, the operating voltage of each coil group within the four regions is independently controlled. Since L1, L2, L3, and L4 correspond to values ​​at different points on the X-axis, the voltage is controlled according to the X-axis. n The relationship between the values ​​of L1, L2, L3, and L4 allows us to determine the specific horizontal position of the rotating shaft 4. Then, based on whether the horizontal position of the rotating shaft 4 needs correction, we can control the voltage magnitude of each coil group within the first region 6 and the third region 8. Where L1 = -25, L2 = -5, L3 = 5, and L4 = 25, all values ​​are in mm. When -5 < X... n When the value is less than 5, it represents the normal operating position of the rotating shaft 4 in the horizontal direction. The coil groups in the first region 6 and the coil groups in the third region 8 are symmetrical with respect to the Y-axis. Since H1, H2, H3, and H4 correspond to the values ​​of points at different locations on the Y-axis, therefore, according to Y... m The relationship between the values ​​of H1, H2, H3, and H4 allows us to determine the specific vertical position of the rotating shaft 4. Then, based on whether the vertical position of the rotating shaft 4 needs correction, we can control the voltage magnitude of each coil group in the second region 7 and the fourth region 9. Here, L1 = 0, L2 = 5, L3 = 10, and L4 = 25, with all values ​​in mm. When 5 < Y... mWhen the value is less than 10, it is the normal working position of the rotating shaft 4 in the vertical direction. The coil groups in the second region 7 and the coil groups in the fourth region 9 are symmetrical with respect to the X-axis.

[0049] Specifically, after the air conditioner is turned on, the initial operating voltage of each coil group in the four zones is the same, with an initial voltage of 110V. The electromagnetic force exerted by the magnetic levitation bearing 3 on the rotating shaft 4 is a repulsive force. When L1≤X n When the voltage is ≤L2, it indicates that the shaft 4 is biased towards the side of the first region 6. Therefore, it is necessary to increase the operating voltage of each coil group in the first region 6 to P1 and decrease the operating voltage of each coil group in the third region 8 to P2, so that the shaft 4 returns to its normal working position in the horizontal direction and ensures the stable operation of the cross-flow fan. Different calculation coefficients are assigned to the voltage control signals of different regions to achieve precise control of the operating current in different regions. For example, P1 can be assigned a coefficient of 1.1 to the initial voltage, and P2 can be assigned a coefficient of 0.9 to the initial voltage. That is, P1 equals the initial voltage multiplied by 1.1, and P2 equals the initial voltage multiplied by 0.9.

[0050] When L2 < X n When the voltage is less than L3, it indicates that the rotating shaft 4 is in a normal operating position in the horizontal direction. Therefore, the voltage corresponding to each coil group in the first region 6 and the voltage corresponding to each coil group in the third region 8 are both P3. Among them, P3 is equal to the initial voltage.

[0051] When L3≤X n When ≤L4, it indicates that the shaft 4 is biased towards the side where the third region 8 is located. Therefore, it is necessary to reduce the operating voltage of each coil group in the first region 6 to P2 and increase the operating voltage of each coil group in the third region 8 to P1 so that the shaft 4 returns to the normal working position in the horizontal direction and ensures the stable operation of the cross-flow fan.

[0052] More specifically, when H1≤Y m When the voltage is ≤H2, it indicates that the shaft 4 is biased towards the side of the second region 7. Therefore, it is necessary to increase the operating voltage of each coil group in the second region 7 to T1 and decrease the operating voltage of each coil group in the fourth region 9 to T2, so that the shaft 4 returns to its normal working position in the vertical direction, ensuring the stable operation of the cross-flow fan. Different calculation coefficients are assigned to the voltage control signals of different regions to achieve precise control of the operating current in different regions. For example, T1 can be assigned a coefficient of 1.1 to the initial voltage, and T2 can be assigned a coefficient of 0.9 to the initial voltage. That is, T1 equals the initial voltage multiplied by 1.1, and T2 equals the initial voltage multiplied by 0.9.

[0053] When H2 < Y mWhen <H3, it indicates that the rotating shaft 4 is in a normal operating position in the vertical direction. Therefore, the voltage corresponding to each coil group in the second region 7 and the voltage corresponding to each coil group in the fourth region 9 are both T3. Wherein, T3 is equal to the initial voltage.

[0054] When H3≤Y m When ≤H4, it indicates that the shaft 4 is biased towards the side where the fourth region 9 is located. Therefore, it is necessary to reduce the operating voltage of each coil group in the second region 7 to T2 and increase the operating voltage of each coil group in the fourth region 9 to T1 so that the shaft 4 returns to the normal working position in the vertical direction and ensures the stable operation of the cross-flow fan.

[0055] Figure 5 This is a control logic diagram of the air conditioner from power-on to power-off process according to an embodiment of the present invention. Figure 5 In the process, when the indoor unit of the air conditioner is turned on, the fan assembly receives the start command, and the position sensor built into the magnetic levitation bearing is simultaneously activated, continuously detecting the position of the permanent magnet shaft at 0.1-second intervals, and transmitting the position data (X) to the fan assembly. n Y m ) is converted into an electrical signal (E) i R j The signal is transmitted to the controller. The controller receives the feedback signal, processes it, and then sends out a voltage control signal (A). x B y C 1z C 2z The voltage control signal is synchronously converted into the coil current (I) of the electromagnetic coil through a power amplifier. Ax I By I C1z I C2z The coil generates a changing electromagnetic force that lifts and maintains the permanent magnet shaft in a set position, thus suspending the cross-flow fan blades and enabling contactless operation with the static structure. The fan assembly is the cross-flow fan, and the permanent magnet shaft is the rotating shaft 4; C 1z That is, the voltage corresponding to each coil group within the first region 6, C 2z That is, the voltage corresponding to each coil group within region 6 of the third region; A x That is, the voltage corresponding to each coil group in the second region 7, B y That is, the voltage corresponding to each coil group in the fourth region 9.

[0056] Figure 6 The diagram shown is a control logic diagram for correcting the shaft position of a cross-flow fan using a magnetic levitation bearing, according to an embodiment of the present invention. Figure 6 In the middle, the permanent magnet shaft, i.e., the rotating shaft 4, A x Assign the coefficient 1.1 or B. x The coefficient is assigned a value of 1.1, which corresponds to voltage T1, A. x Assign the coefficient a value of 0.9 or B.x The coefficient is assigned a value of 0.9, which corresponds to voltage T2, A. x B x A coefficient of 1.0 corresponds to voltage T3; a coefficient of 1.1 for C1 or 1.1 for C2 corresponds to voltage P1; a coefficient of 0.9 for C1 or 0.9 for C2 corresponds to voltage P2; and a coefficient of 1.0 for both C1 and C2 corresponds to voltage T3.

[0057] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A cross-flow fan, characterized in that, The device includes a drive component (1), a cross-flow fan blade (2), and a magnetic levitation bearing (3). One end of the cross-flow fan blade (2) is connected to the drive component (1), and the other end of the cross-flow fan blade (2) has a rotating shaft (4). The rotating shaft (4) is magnetic. The magnetic levitation bearing (3) is sleeved on the outside of the rotating shaft (4). The magnetic levitation bearing (3) includes a stator core (31) and multiple coil groups. The stator core has multiple pole units. Each pole unit is distributed circumferentially along the stator core (31), and each coil group is wound around each pole unit. A shaft support is connected to the inner wall of the stator core (31). When the magnetic levitation bearing (3) is de-energized, the shaft support is used to support the rotating shaft (4). The shaft support is made of non-magnetic material. The shaft support includes a support body (33) and a carrier body (34). The carrier body (34) is connected to the inner wall of the stator core (31) through the support body (33). The carrier body (34) is arc-shaped, and the concave surface of the carrier body (34) faces the rotating shaft (4). The magnetic levitation bearing (3) has a first region (6), a second region (7), a third region (8), and a fourth region (9) connected sequentially along its circumference. The first region (6) is opposite to the third region (8), and the second region (7) is opposite to the fourth region (9). The cross-flow fan also includes a position sensor for detecting the position of the rotating shaft (4). Based on the detection data of the position sensor, the operating voltage corresponding to each coil group in the four regions is independently controlled to correct the position of the rotating shaft.

2. The cross-flow fan according to claim 1, characterized in that, The pole unit includes multiple poles, each pole being spaced apart along the axial direction of the stator core (31), and the coil group includes multiple coils (32), each coil (32) being wound on each pole.

3. The cross-flow fan according to claim 1, characterized in that, The carrier (34) has a plurality of spaced grooves (5), each of which penetrates the carrier (34).

4. An air conditioner, characterized in that, Includes the cross-flow fan as described in any one of claims 1 to 3.

5. A control method for an air conditioner, characterized in that, The control method for controlling the operation of the air conditioner according to claim 4 includes: Start-up procedure: Turn on the air conditioner; Acquisition Steps: Obtain the position coordinates (X) of the rotating shaft (4). n Y m ); Determine the execution steps; based on the X n The voltage magnitude corresponding to each coil group in the first region (6) and the third region (8) is controlled according to the relationship between L1, L2, L3, and L4; based on the Y... m The magnitudes of H1, H2, H3, and H4 are used to control the voltage magnitudes of each coil group in the second region (7) and the fourth region (9); where L1 is the value corresponding to the first target point on the X-axis, L2 is the value corresponding to the second target point on the X-axis, L3 is the value corresponding to the third target point on the X-axis, L4 is the value corresponding to the fourth target point on the X-axis, H1 is the value corresponding to the first target point on the Y-axis, H2 is the value corresponding to the second target point on the Y-axis, H3 is the value corresponding to the third target point on the Y-axis, and H4 is the value corresponding to the fourth target point on the Y-axis.

6. The control method according to claim 5, characterized in that, When L1≤X n When L2 is less than or equal to L2, the voltage corresponding to each coil group in the first region (6) is controlled to be P1, and the voltage corresponding to each coil group in the third region (8) is controlled to be P2; or, When L2 < X n When <L3, the voltage corresponding to each coil group in the first region (6) and the voltage corresponding to each coil group in the third region (8) are both P3; or, When L3≤X n When ≤L4, the voltage corresponding to each coil group in the first region (6) is controlled to be P2, and the voltage corresponding to each coil group in the third region (8) is controlled to be P1; Among them, L1 < L2 < L3 < L4, P2 < P3 < P1.

7. The control method according to claim 5, characterized in that, When H1≤Y m When H2 ≤ H2, the voltage corresponding to each coil group in the second region (7) is controlled to be T1, and the voltage corresponding to each coil group in the fourth region (9) is controlled to be T2; or, When H2 < Y m When <H3, the voltage corresponding to each coil group in the second region (7) and the voltage corresponding to each coil group in the fourth region (9) are both controlled to be T3; or, When H3≤Y m When ≤H4, the voltage corresponding to each coil group in the second region (7) is controlled to be T2, and the voltage corresponding to each coil group in the fourth region (9) is controlled to be T1; Where H1 < H2 < H3 < H4, T2 < T3 < T1.

Images