Patent ID: 11863033
Assignee: BEIHANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC H  F  G | IPC G  H

Claim 8:
9. The displacement detection circuit according to claim 1, wherein a width of a primary air gap corresponding to the displacement of the rotor satisfies the following formula:, h
   =
   
    
     1
     
      2
      ⁢
      
       A
       2
      
     
    
    ⁢
    
     
      
       
        (
        
         
          2
          ⁢
          
           A
           2
          
          ⁢
          
           h
           1
          
         
         +
         
          
           A
           1
          
          ⁢
          
           h
           2
          
         
        
        )
       
       2
      
      -
      
       
        2
        ⁢
        
         μ
         0
        
        ⁢
        N
        ⁢
        
         I
         ⁡
         (
         
          
           4
           ⁢
           
            A
            2
           
           ⁢
           
            h
            1
           
          
          +
          
           2
           ⁢
           
            A
            1
           
           ⁢
           
            h
            2
           
          
         
         )
        
       
       
        
         B
         1
        
        -
        
         B
         2
        
       
      
     
    
   
  
  .
 

wherein h is the width of the primary air gap corresponding to the displacement of the rotor, wherein the displacement of the rotor in the maglev rotor system is equal to a sum of a position of the stator in the maglev rotor system and the width of the primary air gap corresponding to the displacement of the rotor, wherein to is a permeability of vacuum, wherein N is a number of turns of one of the coils, and wherein μ0 is the current, and when the rotor in the maglev rotor system is located in a balanced position, the primary air gap has a width of h1 and a surface area of A1, the auxiliary air gap has a width of h2 and a surface area of A2, wherein B1 is the Hall sensing signal corresponding to the upper auxiliary air gap, and wherein B2 is the Hall sensing signal corresponding to the lower auxiliary air gap.