Washing machine eccentricity monitoring device and washing machine control method

Abstract

The invention provides a washing machine eccentricity monitoring device, comprising: a control rod, which is arranged at a distance from an outer barrel, and one end of the control rod is hinged to a washing machine; a movable shaft of the inductance switch is connected with the control rod through a transmission device; and the control system is electrically connected with the inductance switch, receives the position change information of the movable shaft in the inductance switch, and obtains the real-time eccentric state of the inner barrel according to the position change information. Whether the inner barrel is eccentric or not can be judged by monitoring the position change of the movable shaft in the inductance switch, the structure is simple, and the performance is reliable. The invention further provides a control method of the washing machine applying the washing machine eccentricity monitoring device.

Description

Technical Field

[0001] The present invention belongs to the technical field of washing machines, and more specifically, relates to an eccentric monitoring device for a washing machine and a washing machine control method. Background Art

[0002] When the washing machine starts dehydration, uneven distribution of clothes in the barrel will cause eccentricity of the inner barrel. Severe eccentricity may even cause the outer barrel to collide with the washing machine body, reducing the service life of the washing machine.

[0003] To solve this problem, a Chinese invention patent with the application number CN202110033365.4 discloses a washing machine and its control method. Specifically, an electromagnet and a permanent magnet are respectively arranged on the washing machine body and the barrel. When the electromagnet is energized, the magnetic induction lines are in the same direction as those of the permanent magnet. During the operation of the washing machine, the electromagnet is energized, and the magnitude of the repulsive force between the electromagnet and the permanent magnet is adjusted by changing the magnitude of the current in the electromagnet, so as to realize the induction and control of the eccentricity of the washing machine. However, when the load in the washing machine changes, the position of the washing barrel will move up and down. At this time, the positions of the electromagnet and the permanent magnet will deviate, and the accuracy of eccentricity monitoring cannot be guaranteed.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] An object of the present invention is to overcome the deficiencies of the prior art and provide an eccentric monitoring device for a washing machine, which can judge whether the inner barrel is eccentric by monitoring the position change of the movable shaft in the inductive switch.

[0006] Another object of the present invention is to provide a control method for a washing machine applying the above-mentioned eccentric monitoring device for a washing machine.

[0007] To achieve the first object of the invention, the following technical solutions are adopted:

[0008] An eccentric monitoring device for a washing machine, comprising:

[0009] A control rod, which is arranged at a certain distance from the outer barrel, and one end of the control rod is hinged to the washing machine;

[0010] An inductive switch, the movable shaft of the inductive switch is connected to the control rod through a transmission device;

[0011] A control system, which is electrically connected to the inductive switch, receives the position change information of the movable shaft in the inductive switch, and obtains the real-time eccentric state of the inner barrel according to the position change information.

[0012] Further, the inductive switch includes a movable shaft, a coil and a guide bushing, and the movable shaft moves axially along the coil under the action of the transmission device;

[0013] The guiding bushing is arranged outside the movable shaft and extends along the axial direction of the coil to limit the axial displacement of the movable shaft along the coil.

[0014] The coil is connected to a closed circuit.

[0015] Furthermore, one end of the transmission device is hinged to the control rod, and the other end is hinged to the movable shaft of the inductive switch.

[0016] In the horizontal direction, the connection point of the transmission device and the control rod is arranged between the connection point of the transmission device and the movable shaft and the outer barrel.

[0017] Furthermore, the movable shaft of the inductive switch is a magnet, and an ammeter or a voltmeter is arranged on the closed circuit.

[0018] The control system obtains the position change information of the movable shaft in the coil according to the feedback information of the ammeter or the voltmeter.

[0019] Furthermore, the movable shaft of the inductive switch is an iron core, and the coil is arranged as an inductive coil.

[0020] The control system obtains the position change information of the movable shaft in the inductive coil according to the feedback information of the magnetic induction sensor.

[0021] To achieve the second invention objective, the present invention adopts the following technical solutions:

[0022] A washing machine control method, wherein the washing machine is provided with the above-mentioned washing machine eccentricity monitoring device;

[0023] The washing machine adjusts the rotation speed of the inner barrel during the dehydration stage according to the eccentricity state of the inner barrel obtained by the position change of the movable shaft in the coil.

[0024] Furthermore, compared with the initial position X0, when the position change of the movable shaft in the coil is less than or equal to the first distance X1, the inner barrel maintains the initial rotation speed V0;

[0025] When the position change of the movable shaft in the coil is greater than the first distance X1, the rotation speed of the inner barrel drops to the first rotation speed V1;

[0026] The initial position X0 is the position of the movable shaft in the coil when the outer barrel is not in contact with the control rod.

[0027] Furthermore, when the position change of the movable shaft in the coil is greater than the second distance X2, the dehydration stage stops, and the washing machine re-enters the rinsing stage;

[0028] The second distance X2 is greater than the first distance X1.

[0029] Further, after the set time for the inner tub to decelerate and rotate, the control system determines again whether the change in the position of the movable shaft in the coil is less than or equal to the first distance X1. If so, the inner tub maintains its current rotational speed until the end of the dehydration stage;

[0030] If not, the washing machine controls the inner tub to decelerate again based on its current rotational speed, and makes a judgment again after the set time.

[0031] Further, the washing machine stores the one-to-one correspondence between the change in the position of the movable shaft in the coil and the final rotational speed of the inner tub during the dehydration stage;

[0032] When the change in the position of the movable shaft in the coil is greater than the first distance X1, the washing machine reduces the rotational speed of the inner tub to its corresponding final rotational speed according to the current position change of the movable shaft.

[0033] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0034] 1. The present invention can judge whether the inner tub is eccentric by monitoring the change in the position of the movable shaft in the inductive switch. The structure is simple and the performance is reliable. On the other hand, the present invention can further judge the eccentricity of the inner tub according to the change amplitude of the position of the movable shaft in the inductive switch, and interact with the washing machine more quickly, thereby prolonging the service life of the washing machine.

[0035] 2. During the dehydration stage, the washing machine of the present invention can directly reduce the rotational speed of the inner tub to its corresponding final rotational speed according to the change in the position of the movable shaft in the coil, so as to minimize the influence of the eccentricity of the inner tub as much as possible and further prolong the service life of the washing machine.

[0036] The following further describes in detail the specific embodiments of the present invention with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0038] Figure 1 is a schematic diagram of the state of the eccentricity monitoring device when the present invention has no eccentricity;

[0039] Figure 2 is a schematic diagram of the state of the eccentricity monitoring device when the inner tub of the present invention is eccentric.

[0040] Description of the main components in the figure: 1. Outer tub; 2. Inner tub; 3. Balance ring; 4. Control panel base; 5. Control rod; 6. Transmission device; 7. Guide bushing; 8. Coil; 9. Movable shaft.

[0041] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by reference to specific embodiments. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] As Figure 1-2 shown, the present invention provides an eccentric monitoring device for a washing machine, including:

[0046] A control rod 5 is arranged at a distance from the outer tub 1, and one end of the control rod 5 is hinged to the washing machine;

[0047] An inductive switch, the movable shaft 9 of the inductive switch is connected to the control rod 5 through a transmission device 6;

[0048] A control system is electrically connected to the inductive switch, receives the position change information of the movable shaft 9 in the inductive switch, and obtains the real-time eccentric state of the inner tub 2 based on the position change information.

[0049] In the present invention, when the inner tub 2 is eccentric, as the amplitude of the shaking of the inner tub 2 increases, the inner tub 2 will drive the outer tub 1 to come into contact with the control rod 5. At this time, the control rod 5 drives the movable shaft 9 to displace within the inductor coil through the transmission device 6, and the control system can judge that the inner tub 2 is eccentric by receiving the position change information of the movable shaft 9.

[0050] Specifically, in the present invention, the inductive switch includes a movable shaft 9, a coil 8, and a guide bushing 7. The guide bushing 7 is arranged outside the movable shaft 9 and extends along the axial direction of the coil 8. Therefore, under the action of the guide bushing 7, the movable shaft 9 of the present invention can only displace along the axial direction of the coil 8.

[0051] On the other hand, in the present invention, the coil 8 is also connected to a closed circuit. When the movable shaft 9 is in the initial position, the closed circuit can be in a powered-on state or a non-powered-on state.

[0052] When the closed circuit is in the non-powered-on state, the movable shaft 9 is correspondingly set as a magnet. As the position of the movable shaft 9 changes in the coil 8, the magnetic flux of the coil 8 changes, and an induced current is generated in the coil 8 and the closed circuit connected thereto. At this time, the control system can judge that an eccentric phenomenon occurs in the inner tub 2 by monitoring the current or voltage of the closed circuit.

[0053] Furthermore, in the present invention, the movable shaft 9 and the control rod 5 move in coordination through the transmission device 6. When the eccentricity in the inner tub 2 is relatively serious, the acting force of the outer tub 1 on the control rod 5 is relatively large. Under the action of the transmission device 6, the displacement speed of the movable shaft 9 in the coil 8 is relatively large, and the corresponding magnetic flux change rate is relatively large. Then, the induced current or induced electromotive force in the coil 8 and the closed circuit connected thereto is correspondingly large. Considering that when the displacement speed is large, the position change distance of the movable shaft 9 in the coil 8 will also be correspondingly large. Therefore, the magnitude relationship of the peak current or peak voltage, the magnitude relationship of the position change distance of the movable shaft 9 in the coil 8, and the eccentricity in the inner tub 2 are equivalent in the present invention.

[0054] Therefore, in the present invention, the control system can judge the position change information of the movable shaft 9 in the coil 8 by monitoring the peak current or peak voltage signal of the closed circuit, and then judge the eccentricity in the inner tub 2. After the control system feeds back the eccentricity in the inner tub 2 to the washing machine, the washing machine can reduce the eccentricity by means such as reducing the rotation speed of the inner tub 2, thereby prolonging the service life of the washing machine.

[0055] When the closed circuit is in the energized state, that is, when the coil 8 in the present invention is an inductor coil, the movable shaft 9 of the inductive switch can be set as an iron core. At this time, the coil 8 and the movable shaft 9 form an electromagnet. The influencing factors of the magnetic induction intensity of the electromagnet include the number of turns of the coil 8 wound around the iron core, the intensity of the current in the coil 8, the distance between the coil 8 and the iron core, and the shape of the iron core. In the present invention, the current in the coil 8 is a constant value, the shape of the iron core and the distance between it and the coil 8 are also stable. When eccentricity occurs in the inner barrel 2, with the displacement of the control rod 5, under the action of the transmission device 6, the iron core moves correspondingly in the coil 8, and at this time, the number of turns of the coil 8 wound outside the iron core changes, and the magnetic induction intensity of the electromagnet changes accordingly.

[0056] Therefore, in the present invention, by monitoring the feedback information of the magnetic induction sensor of the magnetic induction intensity, the position change information of the movable shaft 9 in the coil 8 can be judged, and then whether eccentricity occurs in the inner barrel 2 can be judged.

[0057] Specifically, as Figure 2 shown, in an embodiment of the present invention, the transmission device 6 is in the form of a transmission rod, one end of which is hinged to the control rod 5, and the other end is hinged to the movable shaft 9 of the inductive switch.

[0058] In this embodiment, in the horizontal direction, the connection point between the transmission device 6 and the control rod 5 is arranged between the connection point between the transmission device 6 and the movable shaft 9 and the outer barrel 1. When the outer barrel 1 impacts the control rod 5, the movable shaft 9 moves leftward in the coil 8, that is, Figure 2 the direction of the arrow in. Since the number of turns of the coil 8 wound around the iron core decreases, the magnetic induction intensity of the electromagnet decreases accordingly. In other words, in the present invention, when the feedback information of the magnetic induction sensor is less than the initial value, it can be judged that there is an eccentricity phenomenon in the inner barrel 2.

[0059] Furthermore, when the eccentricity in the inner barrel 2 is relatively serious, the acting force between the outer barrel 1 and the control rod 5 is large. Since the movable shaft 9 in the present invention moves in coordination with the control rod 5 through the transmission device 6, at this time, the displacement amplitude of the movable shaft 9 in the coil 8 is large, that is, the change amplitude of the magnetic induction intensity of the electromagnet is large. In other words, the magnitude relationship of the change amplitude of the magnetic induction intensity, the magnitude relationship of the position change distance of the movable shaft 9 in the coil 8, and the eccentricity size in the inner barrel 2 are also equivalent.

[0060] Therefore, in the present invention, the control system can judge the position change information of the movable shaft 9 in the coil 8 by monitoring the change amplitude of the magnetic induction intensity, and then judge the eccentricity situation in the inner barrel 2. After the control system feeds back the eccentricity situation in the inner barrel 2 to the washing machine, the washing machine can reduce the eccentricity by means such as reducing the rotation speed of the inner barrel 2, thereby extending the service life of the washing machine.

[0061] When the outer tub 1 is separated from the control rod 5, the control rod 5 returns to its initial position under the action of gravity, that is, the position parallel to the wall of the outer tub 1, and the movable shaft 9 also returns to its initial position within the coil 8 under the action of the transmission device 6.

[0062] Therefore, when the eccentricity inside the inner tub 2 in the present invention is reduced, the acting force between the outer tub 1 and the control rod 5 decreases, which will be intuitively reflected by the peak current or peak voltage of the closed circuit, or its magnetic induction intensity. The washing machine can make corresponding feedback more quickly, and on the premise of ensuring the washing effect, fully extend the service life of the washing machine.

[0063] The present invention also provides a washing machine control method. The washing tub of the washing machine includes an outer tub 1 and an inner tub 2. The inner tub 2 is sleeved inside the outer tub 1. During the dehydration stage, the inner tub 2 rotates at a high speed, and the clothes are squeezed against the wall of the inner tub 2 under the action of centrifugal force to achieve the dehydration effect. Therefore, to ensure the stability of the inner tub 2 during rotation, a balance ring 3 is also provided at the top of the inner tub 2.

[0064] Furthermore, to adjust in time when eccentricity occurs inside the inner tub 2, the washing machine of the present invention is also provided with the above-mentioned washing machine eccentricity monitoring device. Therefore, the washing machine of the present invention can adjust the rotation speed of the inner tub 2 during the dehydration stage according to the eccentricity state of the inner tub 2 obtained from the position change of the movable shaft 9 within the coil 8. The coil 8 of the inductive switch is arranged at the control panel base 4 of the washing machine, and the other end of the control rod 5 is arranged at the housing of the coil 8 and is hinged thereto.

[0065] Specifically, when the inner tub 2 does not come into contact with the control rod 5, the position of the movable shaft 9 in the coil 8 is the initial position X0.

[0066] Compared with the initial position X0, when the position change of the movable shaft 9 in the coil 8 is less than or equal to the first distance X1, the washing machine determines that the current inner tub 2 has no eccentricity or has a small eccentricity, and controls the inner tub 2 to maintain the initial rotation speed V0, and the initial rotation speed V0 is the highest rotation speed of the inner tub 2 during the dehydration stage.

[0067] When the change of the movable shaft 9 in the coil 8 is greater than the first distance X1, the washing machine determines that the eccentricity in the current inner tub 2 is relatively serious. To extend the service life of the washing machine, the rotation speed of the inner tub 2 needs to be reduced, and the rotation speed of the inner tub 2 is reduced from the initial rotation speed V0 to the first rotation speed V1.

[0068] Furthermore, when the washing machine determines that the eccentricity in the inner tub 2 is relatively serious, it controls the inner tub 2 to rotate clockwise and counterclockwise alternately to further disperse the clothes and prevent them from accumulating together and causing eccentricity.

[0069] After the inner tub 2 rotates at a reduced speed for a set time, the washing machine determines again whether the position change of the movable shaft 9 in the coil 8 is less than or equal to the first distance X1. If so, it indicates that the eccentricity in the inner tub 2 is relieved. At this time, the washing machine can control the inner tub 2 to continue dehydration at the first speed V1.

[0070] If not, that is, after the set time, the eccentricity in the inner tub 2 is still relatively serious. At this time, the washing machine controls the inner tub 2 to reduce the speed again on the basis of the current speed. For example, it reduces from the first speed V1 to the second speed V2, and the inner tub 2 rotates clockwise and counterclockwise alternately, and then makes a judgment again after the set time.

[0071] If the position change of the movable shaft 9 in the coil 8 is less than or equal to the first distance X1 after the set time, it indicates that the eccentricity in the inner tub 2 is relieved, and the inner tub 2 continues dehydration at the current second speed V2.

[0072] If the position change of the movable shaft 9 in the coil 8 is still greater than the first distance X1 after the set time, the washing machine controls the inner tub 2 to reduce the speed again on the basis of the current speed until the control system feedbacks that the position change of the movable shaft 9 in the coil 8 is less than or equal to the first distance X1. At this time, the washing machine determines that the eccentricity in the inner tub 2 is adjusted and performs the dehydration stage at the current speed.

[0073] Further, when the washing machine monitors that there is eccentricity in the inner tub 2, the position change information of the movable shaft 9 in the coil 8 corresponds to different final speeds of the inner tub 2. For example, when the position change information is the third distance X3, when the position change of the movable shaft 9 in the coil 8 is adjusted to be less than or equal to the first distance X1 by reducing the speed of the inner tub 2, the final speed of the inner tub 2 is the third speed V3;

[0074] When the position change information is the fourth distance X4, when the position change of the movable shaft 9 in the coil 8 is adjusted to be less than or equal to the first distance X1 by reducing the speed of the inner tub 2, the final speed of the inner tub 2 may need to be reduced to the fourth speed V4.

[0075] Therefore, in an embodiment of the present invention, the washing machine has a storage function and stores the one-to-one correspondence between the position change of the movable shaft 9 in the coil 8 and the final speed of the inner tub 2 during the dehydration stage.

[0076] When the washing machine determines that there is eccentricity in the inner tub 2, that is, when the position change of the movable shaft 9 in the coil 8 is greater than the first distance X1, the washing machine can directly adjust the speed of the inner tub 2 to the final speed of the inner tub 2 corresponding to its position change.

[0077] When it is determined that there is eccentricity in the inner tub 2, the washing machine may control the inner tub 2 to first reduce from the initial speed V0 to the first speed V1, and then make a judgment again after the set time;

[0078] When it is still determined that the eccentricity in the inner tub 2 is relatively serious after the set time, the washing machine controls the inner tub 2 to decelerate again to the second rotational speed V2, and its deceleration is gradually progressive.

[0079] In this embodiment, the washing machine can directly reduce the rotational speed of the inner tub 2 to the final rotational speed corresponding to its position change information according to the position change of the movable shaft 9 in the coil 8, which is more rapid in adjusting the eccentricity in the inner tub 2 and further extends the service life of the washing machine.

[0080] In another embodiment of the present invention, a second distance X2 is also set for the position change information of the movable shaft 9 in the coil 8. When the position change of the movable shaft 9 in the coil 8 is greater than the second distance X2, the washing machine determines that the eccentricity in the inner tub 2 is relatively serious at this time, and only reducing the rotational speed of the inner tub 2 cannot correct the deviation. To avoid damaging the internal structure, the washing machine stops the dehydration stage at this time and re-enters the rinsing stage. After the clothes accumulated together are dispersed through the rinsing stage, it enters the dehydration stage again for dehydration.

[0081] Correspondingly, the second distance X2 needs to be greater than the first distance X1, and at this time, the third distance X3 and the fourth distance X4 are located between the first distance X1 and the second distance X2.

[0082] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

[0083] The present invention can determine whether the inner tub 2 is eccentric by monitoring the position change of the movable shaft 9 in the inductive switch, with a simple structure and reliable performance; on the other hand, the present invention can further determine the eccentricity magnitude of the inner tub 2 through the position change amplitude of the movable shaft 9 in the inductive switch, and the interaction with the washing machine is more rapid, thereby extending the service life of the washing machine.

[0084] On the other hand, during the dehydration stage, the washing machine of the present invention can directly reduce the rotational speed of the inner tub 2 to the final rotational speed corresponding to it according to the position change of the movable shaft 9 in the coil 8, so as to minimize the influence of the eccentricity phenomenon of the inner tub 2 as much as possible and further extend the service life of the washing machine.

[0085] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some changes or modifications to equivalent embodiments by using the technical content prompted above within the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. An eccentric monitoring device for a washing machine, characterized in that, Comprising: A control rod is arranged at a distance from the outer tub, and one end of the control rod is hinged to the washing machine; An inductive switch, the movable shaft of the inductive switch is connected to the control rod through a transmission device; A control system, electrically connected to the inductive switch, receives the position change information of the movable shaft in the inductive switch, and obtains the real-time eccentricity state of the inner tub according to the position change information.

2. The eccentric monitoring device for a washing machine according to claim 1, wherein, The inductive switch includes a movable shaft, a coil and a guide bushing, and the movable shaft axially displaces along the coil under the action of the transmission device; The guide bushing is arranged outside the movable shaft and extends axially along the coil to limit the axial displacement of the movable shaft along the coil; The coil is connected to a closed circuit.

3. The eccentric monitoring device for a washing machine according to claim 1, characterized in that, One end of the transmission device is hinged to the control rod, and the other end is hinged to the movable shaft of the inductive switch; In the horizontal direction, the connection point of the transmission device and the control rod is arranged between the connection point of the transmission device and the movable shaft and the outer tub.

4. The eccentric monitoring device of a washing machine according to claim 2, characterized in that, The movable shaft of the inductive switch is a magnet, and an ammeter or a voltmeter is arranged on the closed circuit; The control system obtains the position change information of the movable shaft in the coil according to the feedback information of the ammeter or the voltmeter.

5. The eccentric monitoring device for a washing machine according to claim 2, characterized in that, The movable shaft of the inductive switch is an iron core, and the coil is arranged as an inductive coil; The control system obtains the position change information of the movable shaft in the inductive coil according to the feedback information of the magnetic induction sensor.

6. A washing machine control method, characterized in that, The washing machine is provided with the washing machine eccentricity monitoring device according to any one of claims 1-5; The washing machine adjusts the rotation speed of the inner tub during the dehydration stage according to the eccentricity state of the inner tub obtained by the position change of the movable shaft in the coil.

7. A washing machine control method according to claim 6, characterized in that, Compared with the initial position X0, when the position change of the movable shaft in the coil is less than or equal to the first distance X1, the inner tub maintains the initial rotation speed V0; When the position change of the movable shaft in the coil is greater than the first distance X1, the rotation speed of the inner tub drops to the first rotation speed V1; The initial position X0 is the position of the movable shaft in the coil when the outer tub does not contact the control rod.

8. A washing machine control method according to claim 7, characterized in that When the position change of the movable shaft in the coil is greater than the second distance X2, the dehydration stage stops, and the washing machine re-enters the rinsing stage; The second distance X2 is greater than the first distance X1.

9. A washing machine control method according to claim 7, characterized in that, After the inner tub rotates at a reduced speed for a set time, the control system determines again whether the position change of the movable shaft in the coil is less than or equal to the first distance X1. If so, the inner tub maintains the current rotation speed until the end of the dehydration stage; If not, the washing machine controls the inner tub to reduce the speed again based on the current rotation speed, and makes a judgment again after the set time.

10. A washing machine control method according to claim 6, characterized in that, The washing machine stores the one-to-one correspondence between the position change of the movable shaft in the coil and the final rotation speed of the inner tub during the dehydration stage; When the position change of the movable shaft in the coil is greater than the first distance X1, the washing machine reduces the rotation speed of the inner tub to the corresponding final rotation speed according to the current position change of the movable shaft.

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