Patent Publication Number: US-2023154659-A1

Title: Vehicle and method of controlling seat for vehicle

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority to Korean Patent Application No. 10-2021-0158187, filed on Nov. 17, 2021, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     Embodiments relate to a vehicle and a method of controlling a seat for the vehicle. Specifically, embodiments relate to a vehicle and a method of controlling a seat for the vehicle having an improved structure in order to freely move the seat using a magnetic levitation force, provide a passenger&#39;s convenience through the movement, and secure a space within a vehicle compartment. 
     BACKGROUND 
     Seats for passengers (occupants) may be disposed in the interior of a vehicle. 
       FIG.  1    is a view showing a conventional seat and the movement relationship of the seat. 
     Referring to  FIG.  1   , a conventional vehicle may include a seat  2  disposed in a vehicle compartment and a rail  3  configured to guide the movement of the seat  2 . Here, the rail  3  may be disposed on a floor  4  in the vehicle compartment. 
     There is a problem that a moving direction and moving range of the seat  2  are restricted by the rail  3  because the conventional seat  2  disposed in the vehicle moves along the rail  3 . For example, since the seat  2  is movably fixed to the rail  3 , only limited movement is possible. 
     Accordingly, in a situation in which autonomous vehicles are becoming more common, there is a limit in responding to postures of passengers seated on the seat  2 , various positions of the seat  2  according to the postures, and the like. 
     In addition, there is a problem in that a vehicle compartment space provided for the interior and the like becomes narrow due to the arrangement of the rail  3  in the vehicle compartment. 
     Accordingly, there is a demand for a vehicle capable of securing an interior space in the vehicle compartment for interior design as well as satisfying the passenger&#39;s need for freely changing the position of the seat. 
     SUMMARY 
     Embodiments are directed to providing a vehicle and a method of controlling a seat for the vehicle capable of freely changing a position of the seat using a magnetic levitation force. 
     Embodiments are directed to providing a vehicle and a method of controlling a seat for the vehicle that protect passengers by forming a buffer area through the movement of a position of the seat when an impact such as a vehicle collision, or the possibility of collision increases. 
     Objectives to be solved by the present invention are not limited to the above-described objectives, and other objectives, which are not described above, will be clearly understood by those skilled in the art from the following description. 
     According to an aspect of the present invention, there is provided a vehicle including: a magnet unit disposed under a seat and at which a plurality of magnets are disposed; an electromagnetic unit disposed on a floor of a vehicle compartment and including a plurality of electromagnets; and a control unit configured to control the electromagnetic unit, wherein the control unit moves the seat to a preset position on the electromagnetic unit by controlling current applied to each of the electromagnets. 
     Here, the magnetic unit may include a plurality of magnets, and a body at which the magnets are disposed, the magnets may include a first magnet, and a plurality of second magnets disposed to be spaced apart from the first magnet by a predetermined interval, and magnetic polarities of the first magnet and the second magnets may be different. 
     In addition, a size of the first magnet may be formed to be greater than a size of each of the second magnets. 
     In addition, the size of the second magnet may be formed to be greater than a size of each of the electromagnets. 
     In addition, a first separation distance (d 1 ) between the first magnet and the second magnet may be formed to be greater than a second separation distance (d 2 ) between the electromagnets. 
     Meanwhile, the electromagnetic unit may include a frame, and the plurality of electromagnets disposed to be spaced apart from each other in the frame, and the electromagnets may include a power supply unit controlled by the control unit, and a coil electrically connected to the power supply unit. 
     In addition, the electromagnetic unit may include a frame, and the plurality of electromagnets disposed to be spaced apart from each other in the frame, and an electromagnet disposed to vertically overlap the first magnet may form the same magnetic polarity as that of the first magnet. 
     Here, an electromagnet disposed in a moving direction with respect to the moving direction of the seat may form a magnetic polarity different from that of the second magnet by the control unit. 
     At this time, an electromagnet disposed in an opposite direction to the moving direction may form the same magnetic polarity as that of the second magnet by the control unit. 
     In addition, when the seat reaches the set position, the control unit may release power applied to the electromagnet. Alternatively, when the seat reaches the set position, some of the electromagnets vertically overlapping the magnet may form magnetic polarities different from the magnet by the control unit. 
     In addition, an electromagnet disposed adjacent to the second magnet in a rotating direction with respect to the rotating direction of the seat may form a magnetic polarity different from that of the second magnet by the control unit. 
     At this time, an electromagnet disposed adjacent to the second magnet in an opposite direction to the rotating direction may form the same magnetic polarity as that of the second magnet by the control unit. 
     In addition, an electromagnet disposed to vertically overlap the second magnet may be in an off state. 
     Meanwhile, the vehicle may further include a sensor configured to detect a collision, in which the control unit which determines the possibility of collision based on a signal of the sensor may form a buffer area in a vehicle compartment by controlling the electromagnetic unit to move the seat away from a collision position. 
     In addition, when the collision is detected by the sensor, an electromagnet disposed to vertically overlap the first magnet may form a magnetic polarity different from that of the first magnet. 
     In addition, the magnet may be a superconducting magnet. 
     According to another aspect of the present invention, there is provided a method of controlling a seat for a vehicle including: levitating a seat having a magnet disposed on a lower portion by applying power to an electromagnetic unit in which a plurality of electromagnets are disposed; moving the seat by controlling an electromagnet disposed in a moving direction of the seat; and releasing the power applied to the electromagnet when the seat reaches a preset position. 
     According to still another aspect of the present invention, there is provided a method of controlling a seat for a vehicle including: levitating a seat having a magnet disposed on a lower portion by applying power to an electromagnetic unit in which a plurality of electromagnets are disposed; rotating the seat by controlling an electromagnet disposed in a rotating direction of the seat; and releasing the power applied to the electromagnet when the seat reaches a preset position. 
     According to embodiments, it is possible to freely change a position of a seat using a magnet disposed under the seat and a plurality of electromagnets disposed on a floor of a vehicle compartment. In other words, according to the embodiments, it is possible to secure production competitiveness by implementing a seat movement mechanism suitable for the era of autonomous traveling of vehicles to provide a passenger&#39;s convenience. 
     According to embodiments, it is possible to secure a space in a vehicle compartment by removing a conventional seat-rail mechanism. Accordingly, it is possible to improve the degree of freedom in interior design in the vehicle compartment through the secured space. 
     According to embodiments, it is possible to protect passengers who are in a vehicle by forming a buffer area through the movement of a position of a seat when the possibility of the vehicle colliding with external objects increases. At this time, it is possible to further improve stability for the passengers by additionally applying power to an electromagnet to fix the seat to the floor. 
     Various useful advantages and effects of the embodiments are not limited to the above-described contents and will be more easily understood from descriptions of the specific embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which: 
         FIG.  1    is a view showing a conventional seat and the movement relationship of the seat; 
         FIG.  2    is a view showing a vehicle according to an embodiment; 
         FIG.  3    is a view showing a seat unit of the vehicle according to the embodiment; 
         FIG.  4    is a view showing the arrangement relationship of a magnet disposed on the seat unit of the vehicle according to the embodiment; 
         FIG.  5    is a view showing an electromagnet unit of the vehicle according to the embodiment; 
         FIGS.  6  and  7    are views showing a movement mechanism of the seat unit of the vehicle according to the embodiment; 
         FIGS.  8  and  9    are views showing the seat unit fixed to the electromagnet unit of the vehicle according to the embodiment; 
         FIG.  10    is a view showing a rotation mechanism of the seat unit of the vehicle according to the embodiment; 
         FIG.  11    is a view showing the movement mechanism of the seat unit of the vehicle according to the embodiment when a collision of the vehicle is detected; 
         FIG.  12    is a block diagram showing one embodiment of a method of controlling a seat for a vehicle according to the embodiment; and 
         FIG.  13    is a block diagram showing another embodiment of the method of controlling the seat for the vehicle according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Since the present invention allows various changes and has many embodiments, specific embodiments will be illustrated in the accompanying drawings and described. However, this is not intended to limit the present invention to the specific embodiments, and it is to be appreciated that all changes, equivalents, and substitutes that fall within the spirit and technical scope of the present invention are encompassed in the present invention. 
     Although the terms “first,” “second,” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a second element could be termed a first element, and a first element could similarly be termed a second element without departing from the scope of the present invention. The term “and/or” includes any one or any combination among a plurality of associated listed items. 
     When an element is referred to as being “connected” or “coupled” to another element, it will be understood that the element can be directly connected or coupled to another element, or other elements may be present therebetween. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, it will be understood that there are no intervening elements. 
     In a description of the embodiment, in a case in which any one element is described as being formed on or under another element, such a description includes both a case in which the two elements are formed in direct contact with each other and a case in which the two elements are in indirect contact with each other with one or more other elements interposed between the two elements. In addition, when one element is described as being formed on or under another element, such a description may include a case in which the one element is formed at an upper side or a lower side with respect to another element. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. The singular forms are intended to include the plural forms, unless the context clearly indicates otherwise. In the present specification, it should be further understood that the terms “comprise,” “comprising,” “include,” and/or “including,” when used herein, specify the presence of stated features, numbers, steps, operations, elements, and/or components but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof. 
     Unless otherwise defined, all terms including technical and scientific terms used herein have meanings which are the same as meanings generally understood by those skilled in the art. Terms, such as those defined in commonly used dictionaries, should be interpreted as having meanings that are consistent with their meanings in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined here. 
     Hereinafter, when embodiments are described in detail with reference to the accompanying drawings, components that are the same or correspond to each other will be denoted by the same or corresponding reference numerals in all drawings, and redundant descriptions will be omitted. 
     In line with the era of autonomous traveling of vehicles and electric vehicles, the convenience of moving a position of a seat is required. Here, a vehicle may include a seat on which a passenger sits and a safety device such as a seat belt for the safety of the passenger. 
     Accordingly, the vehicle according to embodiment may provide a magnetic levitation force to the seat through a magnet and a plurality of electromagnets disposed under the seat, and control the current applied to the plurality of electromagnets to move, rotate, or fix the seat. 
       FIG.  2    is a view showing a vehicle according to the embodiment,  FIG.  3    is a view showing a seat unit for the vehicle according to the embodiment,  FIG.  4    is a view showing the arrangement relationship of a magnet disposed on the seat unit for the vehicle according to the embodiment, and  FIG.  5    is a view showing an electromagnet unit for the vehicle according to the embodiment. Here, as shown in  FIG.  4   , an X direction may mean a front-rear direction, an Y direction may mean a vehicle width direction or a horizontal direction, and a Z direction may mean a vertical direction. In addition, the front-rear direction and the vehicle width direction may be perpendicular to each other. In addition, the front-rear direction may include a front direction toward a steering wheel and a rear direction opposite to the front direction. In addition, the vertical direction may include an upward direction toward a ceiling of the vehicle and a downward direction opposite to the upward direction. In addition, the seat unit may mean a seat  2  and a magnet unit  100  coupled to a lower portion of the seat  2 . 
     Referring to  FIGS.  2  to  5   , the vehicle according to the embodiment may include the magnet unit  100  disposed under the seat  2  and at which a plurality of magnets  110  are disposed, an electromagnet unit  200  disposed on a floor  4  of the vehicle compartment and including a plurality of electromagnets, and a control unit  300  configured to control the electromagnet unit  200 . Here, the electromagnet unit  200  may be electrically connected to the control unit  300 . At this time, the control unit  300  may be a controller such as an electronic control unit (ECU) or microcontroller unit (MCU). 
     In addition, the control unit  300  may move the seat  2  to a preset position on the electromagnet unit  200  by controlling flow directions of the power and current applied to each of the electromagnets  220 . For example, the control unit  300  may control the electromagnet unit  200  to move the seat from a standby position (current position) to the set position (movement or rotation position). 
     Referring to  FIGS.  3  and  4   , the magnet unit  100  may include the plurality of magnets  110  and a body  120  at which the magnets  110  are disposed. In addition, the magnets  110  may include a first magnet  111  and second magnets  112  disposed to be spaced apart from the first magnet  111  to have a predetermined separation distance. Here, the separation distance between the first magnet  111  and each of the second magnets  112  may be referred to as a first separation distance d 1 . 
     In addition, magnetic polarities or poles of the first magnet  111  and the second magnets  112  may be different. For example, when the first magnet  111  disposed at a center of the body  120  has an S polarity, the second magnets  112  may have an N polarity. 
     In addition, the plurality of second magnets  112  may be disposed around the first magnet  111 . As shown in  FIG.  4   , four second magnets  112  may be disposed, two of which are disposed in the front-rear direction and two of which are disposed in the left-right direction, corresponding to side surfaces of the first magnet  111 . 
     Referring to  FIG.  4   , the size of the first magnet  111  may be formed to be greater than that of the second magnet  112 . In other words, it is possible to secure stability when the seat  2  is levitated by forming the horizontal size of the first magnet  111  disposed at the center of the body  120  to be greater than the horizontal size of the second magnet  112 . For reference, to control the movement of the seat  2  through a size difference between the magnet  110  and the electromagnet  220 , the horizontal size of the electromagnet  220  may be formed to be smaller than the horizontal size of the second magnet  112 . 
     As a magnetic levitation force for the first magnet  111  or the second magnet  112  is formed by the electromagnet unit  200 , the seat  2  levitates to a predetermined height. 
     At this time, since the size of the second magnet  112  is formed to be smaller than that of the first magnet  111 , a magnetic force (attraction or repulsive force) generated between the second magnet  112  and the electromagnet  220  may be formed to be smaller than a magnetic force generated between the first magnet  111  and the electromagnet  220 . Accordingly, the influence of the magnetic force generated between the second magnet  112  and the electromagnet  220  is smaller than the influence of the magnetic force generated between the first magnet  111  and the electromagnet  220 . Here, the magnetic force generated between the first magnet  111  and the electromagnet  220  may be referred to as a first magnetic force, and the magnetic force generated between the second magnet  112  and the electromagnet  220  may be referred to as a second magnetic force. 
     Accordingly, the vehicle according to the embodiment may secure position stability according to the levitation of the seat  2  by implementing the first magnetic force greater than the second magnetic force through the first magnet  111  greater than the second magnet  112 . In addition, it is possible to secure the position stability according to the levitation of the seat  2  by disposing the second magnets  112  symmetrically with respect to the center of the first magnet  111 . 
     Furthermore, the vehicle may further include a load sensor (not shown) disposed on the seat  2 . Here, the load sensor may measure a passenger&#39;s weight, and transmit a signal including the information to the control unit  300 . In addition, the control unit  300  may adjust the levitation height of the seat  2  by adjusting the intensity of power applied to the electromagnet  220  based on the signal. Accordingly, the vehicle may further improve the passenger&#39;s convenience. 
     Meanwhile, the magnet  110  may be provided as a superconducting magnet. Accordingly, the magnet  110  may form a high magnetic field in a certain area. 
     The body  120  may support the magnet  110 . In addition, the body  120  may be formed of a non-magnetic substance such as plastic in order to prevent interference with the magnetic force of the magnet  110 . 
     The electromagnet unit  200  may be disposed on the floor  4  of the vehicle. Accordingly, the electromagnet unit  200  may be installed on the floor  4  instead of a conventional rail  3  having a predetermined height, and thus it is possible to secure a space for the interior of the vehicle compartment. For example, an upper surface of the electromagnet unit  200  may form the same plane as the floor  4 , and thus it is possible to secure the space for the interior of the vehicle compartment. 
     Referring to  FIG.  5   , the electromagnet unit  200  may include a frame  210  and a plurality of electromagnets  220  disposed to be spaced apart from each other in the frame  210 . In addition, each of the electromagnets  220  may include a power supply unit  221  controlled by the control unit  300  and a coil  222  electrically connected to the power supply unit  221 . Accordingly, the electromagnet  220  may be referred to as a coil cell. 
     The frame  210  may support the electromagnet  220 . 
     In addition, the frame  210  may minimize or block the influence between the electromagnets  220  by implementing a partition wall structure. For example, the frame  210  may be made of a non-magnetic substance such as plastic. 
     In addition, the frame  210  may be formed in a shape corresponding to the shape of the electromagnet  220  in order to prevent the electromagnetic force generated by one electromagnet  220  from interfering with another electromagnet  220 . As shown in  FIG.  5   , the frame  210  may be formed in a grid shape corresponding to the electromagnet  220  formed in a hexahedral shape. 
     Each of the plurality of electromagnets  220  may be controlled by the control unit  330 . 
     Accordingly, the control unit  300  may generate an electromagnetic force by applying power to the electromagnet  220 . In addition, the control unit  300  may release the power applied to the electromagnet  220 , that is, block the formation of the electromagnetic force by releasing the power. 
     In addition, when the power is applied, the control unit  300  may implement an S polarity or an N polarity in the electromagnet  220  by controlling a direction of the current flowing through the coil  222 . 
     Meanwhile, the electromagnets  220  may be disposed to have a predetermined second separation distance d 2 . Here, the first separation distance d 1  may be formed to be greater than the second separation distance d 2  between the electromagnets  220 . 
     Accordingly, the vehicle facilitates a movement control of the seat  2  by not only differentiating the sizes of the magnet  110  and the electromagnet  220  but also forming the separation distances d 1  and d 2  differently. For example, through the difference in size and the difference in the separation distances d 1  and d 2 , the control unit  300  finely controls the movement of the seat  2  to enable smooth movement of the seat  2 . Accordingly, the vehicle can minimize vibration and noise generated when the seat  2  is moved. 
       FIGS.  6  and  7    are views showing a movement mechanism of the seat unit for the vehicle according to the embodiment, and  FIGS.  8  and  9    are views showing the seat unit fixed to the electromagnet unit for the vehicle according to the embodiment. The arrows shown in  FIGS.  6  and  7    indicate a moving direction of the seat unit. In addition, the electromagnet  220  in which hatching is not displayed among the electromagnets  220  shown in  FIG.  6    may indicate an off state. 
     Referring to  FIGS.  6  and  7   , the electromagnet  220  disposed to vertically overlap the first magnet  111  by the control unit  300  of the vehicle may levitate the seat  2  by forming the same magnetic polarity as that of the first magnet  111 . For example, when the first magnet  111  has an S polarity, the electromagnet  220  disposed to vertically overlap the first magnet  111  may levitate the seat  2  by implementing the S polarity. 
     In addition, the electromagnet  220  disposed to vertically overlap the second magnet  112  by the control unit  300  of the vehicle may levitate the seat  2  by forming the same magnetic polarity as that of the second magnet  112 . For example, when the second magnet  112  has an N polarity, the electromagnet  220  disposed to vertically overlap the second magnet  112  may function to assist the levitation of the seat  2  by implementing the N polarity. 
     In addition, the electromagnets  220  disposed in the moving direction may sequentially form magnetic polarities different from those of the second magnets  112  by the control unit  300  with respect to the moving direction of the seat  2 . Accordingly, since an attractive force is generated between the second magnet  112  and the electromagnet  220  disposed in the moving direction, the seat  2  moves along the moving direction. 
     When the seat  2  is moved, the electromagnet  220  disposed to vertically overlap the first magnet  111  may maintain the magnetic levitation force by forming the same magnetic polarity as that of the first magnet  111 . 
     In addition, the electromagnet  220  disposed in an opposite direction to the moving direction may form the same magnetic polarity as that of the second magnet  112  by the control unit  300 . Accordingly, the seat  2  may move in the moving direction more effectively. 
     Meanwhile, when the seat  2  is moved, the electromagnet  220  other than the electromagnet  220  in which the magnetic polarity is formed according to the application of power may be in an off state because power is not applied thereto. 
     Referring to  FIG.  8   , after the seat  2  is completely moved to a set position, the control unit  300  may release the power applied to the electromagnet  220 . Accordingly, the magnet unit  100  may be fixed to an upper portion of the electromagnet unit  200  by the magnetic force formed in the magnet unit  100 . For example, when the seat  2  reaches the set position, the control unit  300  may fix the magnet unit  100  to the upper portion of the electromagnet unit  200  by releasing the power applied to the electromagnet  220 . 
     Furthermore, when the seat  2  reaches the set position, the control unit  300  may form the magnetic polarities of some of the electromagnets  220  vertically overlapping the magnet  110  as a magnetic polarity different from that of the magnet  110  (see  FIG.  9   ). Accordingly, a fixing force of the seat  2  can be further improved. 
       FIG.  10    is a view showing a rotation mechanism of the seat unit for the vehicle according to the embodiment. Here, the arrows shown in  FIG.  10    indicate a rotating direction of the seat unit. 
     Referring to  FIG.  10   , the seat  2  may rotate through the electromagnet  220  controlled by the control unit  300 . 
     The electromagnet  220  disposed adjacent to the second magnet  112  in the rotating direction with respect to the rotating direction of the seat  2  may form a magnetic polarity different from that of the second magnet  112  by the control unit  300 . In addition, the electromagnet  220  disposed adjacent to the second magnet  112  in the opposite direction to the rotating direction may form the same magnetic polarity as that of the second magnet  112  by the control unit  300 . At this time, the electromagnet  220  disposed to vertically overlap the second magnet  112  may be in an off state. Accordingly, the seat  2  may rotate smoothly. Here, the term “adjacent” may refer to being disposed close to each other even while having a predetermined separation distance in the rotating direction. 
     When the seat  2  is rotated, the electromagnet  220  disposed adjacent to the second magnet  112  in the opposite direction of the rotating direction forms the same magnetic polarity as that of the second magnet  112  as an example, but the present invention is not necessarily limited thereto. For example, when the seat  2  is rotated, the electromagnet  220  disposed adjacent to the second magnet  112  in the opposite direction to the rotating direction may also be in an off state. However, when the electromagnet  220  disposed adjacent to the second magnet  112  in the opposite direction to the rotating direction is in an off state, it is also possible to rotate the seat  2  more quickly by a rotational inertia of the seat  2 . 
     Meanwhile, an impact such as a collision may occur in the vehicle. In particular, when the vehicle is driven, the collision acts as a factor harmful to the passenger&#39;s safety. 
     Accordingly, the vehicle according to the embodiment can more safely protect the passenger by moving the seat  2  away from a collision position (point) in response to the collision. 
       FIG.  11    is a view showing the movement mechanism of the seat unit for the vehicle according to the embodiment when the collision of the vehicle is detected. 
     Referring to  FIG.  11   , the vehicle may further include a sensor  400  configured to detect a collision. Here, the sensor  400  may be referred to as a collision detection sensor or a first sensor so as to be distinguished from the load sensor. 
     The sensor  400  may detect a distance or collision with an object around the vehicle. 
     In addition, the sensor  400  may provide the object and distance information to the control unit  300 . Accordingly, the control unit  300  may determine the possibility of collision with the object, and control the electromagnet unit  200  to move the seat  2  away from the collision position. At this time, the movement of the seat  2  may use the above-described movement mechanism. 
     Accordingly, as the seat  2  moves away from the collision position, a buffer area A may be formed on the electromagnet  200 , and the passenger can be more safely protected through the buffer area A. 
     Meanwhile, when the collision is detected by the sensor  400 , the electromagnet  220  disposed to vertically overlap the first magnet  111  may further improve a fixing force of the seat  2  by forming a magnetic polarity different from that of the first magnet  111  by the control unit  300 . At this time, the electromagnet  220  disposed to vertically overlap the second magnet  112  may further improve the fixing force of the seat  2  by forming a magnetic polarity different from that of the second magnet  112  by the control unit  300 . 
     Accordingly, the passenger can be more safely protected. 
       FIG.  12    is a block diagram showing a control method of moving a seat for a vehicle according to the embodiment, and  FIG.  13    is a block diagram showing a control method of rotating a seat for a vehicle according to the embodiment. 
     Hereinafter, a method of controlling a seat for a vehicle will be described with reference to  FIGS.  12  and  13   . 
     Referring to  FIG.  12   , a control method (S 1 ) of moving a seat for a vehicle according to the embodiment may include: a levitating operation (S 100 ) of levitating a seat having a magnet disposed on a lower portion by applying power to an electromagnetic unit in which a plurality of electromagnets are disposed; a moving operation (S 200 A) of moving the seat by controlling an electromagnet disposed in a moving direction of the seat; and a power releasing operation (S 300 ) of releasing power applied to the electromagnet when the seat reaches a preset position. 
     Referring to  FIG.  6   , in the levitating operation (S 100 ), the seat  2  may be levitated by applying power to form the same magnetic polarity as that of the first magnet  111  on the electromagnet  220  disposed to vertically overlap the first magnet  111 . 
     In addition, the seat  2  may be levitated by forming the same magnetic polarity as that of the second magnet  112  on the electromagnet  220  disposed to vertically overlap the second magnet  112 . 
     Referring to  FIGS.  6  and  7   , in the moving operation (S 200 A), magnetic polarities different from those of the second magnets  112  may be sequentially formed on the electromagnets  220  disposed in the moving direction. Accordingly, an attractive force is generated between the second magnet  112  and the electromagnet  220  disposed in the moving direction, and thus the seat  2  moves in the moving direction. 
     Referring to  FIG.  8   , in the power releasing operation (S 300 ), when the seat  2  reaches the set position, the magnetic unit  100  may be fixed to an upper portion of the electromagnetic unit  200  by releasing the power applied to the electromagnet  220 . 
     Meanwhile, the control method (S 1 ) of moving the seat for the vehicle according to the embodiment may further include a fixing force improving operation, which is an operation of improving the fixing force of the seat. 
     In the fixing force improving operation, when the seat  2  reaches the set position, it is possible to improve the fixing force of the seat  2  by forming magnetic polarities of some of the electromagnets  220  vertically overlapping the magnet  110  as a magnetic polarity different from that of the magnet  110 . 
     Referring to  FIG.  13   , a control method (S 2 ) of rotating a seat for a vehicle according to the embodiment may include: a levitating operation (S 100 ) of levitating a seat having a magnet disposed on a lower portion by applying power to an electromagnetic unit in which a plurality of electromagnets are disposed; a rotating operation (S 200 ) of rotating the seat by controlling the electromagnet disposed in a rotating direction of the seat; and a power releasing operation (S 300 ) of releasing the power applied to the electromagnet when the seat reaches a preset position. 
     Referring to  FIG.  6   , in the levitating operation (S 100 ), the seat  2  may be levitated by applying power to form the same magnetic polarity as that of the first magnet  111  on the electromagnet  220  disposed to vertically overlap the first magnet  111 . 
     In addition, the seat  2  may be levitated by forming the same magnetic polarity as that of the second magnet  112  on the electromagnet  220  disposed to vertically overlap the second magnet  112 . 
     Referring to  FIG.  10   , in the rotating operation (S 200 B), magnetic polarities different from those of the second magnet  112  may be sequentially formed on the electromagnets  220  disposed adjacent to the second magnet  112  in the rotating direction. Accordingly, an attractive force is generated between the second magnet  112  and the electromagnet  220  disposed adjacent to the second magnet  112  in the rotating direction, and thus the seat  2  rotates in the rotating direction. 
     Referring to  FIG.  8   , in the power releasing operation (S 300 ), when the seat  2  reaches the set position, the magnetic unit  100  may be fixed to an upper portion of the electromagnetic unit  200  by releasing the power applied to the electromagnet  220 . 
     Meanwhile, the control method (S 2 ) of moving the seat for the vehicle according to the embodiment may further include a fixing force improving operation, which is an operation of improving a fixing force of the seat. 
     In the fixing force improving operation, when the seat  2  reaches the set position, it is possible to improve the fixing force of the seat  2  by forming magnetic polarities of some of the electromagnets  220  vertically overlapping the magnet  110  as a magnetic polarity different from that of the magnet  110 . 
     While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.