Patent ID: 11859686
Assignee: HARBIN ENGINEERING UNIVERSITY
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 1:
2. The method according to claim 1, wherein the step 2 comprises: establishing an electromagnetic force expression under magnetic unsaturation, determining an electromagnetic attraction force of an electromagnet, and representing the electromagnetic attraction force of the electromagnet by the following formulas:, F
       
        m
        ⁢
        a
        ⁢
        g
        ⁢
        1
       
      
      =
      
       
        
         1
         2
        
        ⁢
        
         
          Φ
          1
          2
         
         
          
           μ
           0
          
          ⁢
          
           S
           
            i
            ⁢
            n
           
          
         
        
       
       +
       
        
         1
         2
        
        ⁢
        
         
          Φ
          1
          2
         
         
          
           μ
           0
          
          ⁢
          
           S
           
            o
            ⁢
            u
            ⁢
            t
           
          
         
        
       
      
     
     ,
    
   
  
  
   
    
     
      
       Φ
       1
      
      =
      
       
        
         N
         1
        
        ⁢
        
         I
         
          C
          ⁢
          1
         
        
       
       
        R
        
         t
         ⁢
         o
         ⁢
         t
         ⁢
         a
         ⁢
         l
         ⁢
         1
        
       
      
     
     ,
    
   
  
  
   
    
     
      
       S
       out
      
      =
      
       
        π
        4
       
       ⁢
       
        (
        
         
          l
          6
          2
         
         -
         
          l
          5
          2
         
        
        )
       
      
     
     ,
    
   
  
  
   
    
     
      
       S
       
        i
        ⁢
        n
       
      
      =
      
       
        π
        4
       
       ⁢
       
        (
        
         
          l
          4
          2
         
         -
         
          l
          3
          2
         
        
        )
       
      
     
     ,
    
   
  
 

wherein Emag1 represents an electromagnetic attraction force of first electromagnet; Rtotal1 represents a total reluctance of the first electromagnet; Φ1 represents a magnetic flux of the first electromagnet; μ0 represents permeability of vacuum; Sin represents an equivalent cross-sectional area of an inner magnetic pole; Sout represents an equivalent cross-sectional area of an outer magnetic pole; and Ic1 represents a current passing through the first coil; and
determining the total reluctance of the first electromagnet according to an air gap reluctance of first armature and a reluctance of the first armature, and representing the total reluctance of the first electromagnet by the following formulas:, R
    
     total
     ⁢
     1
    
   
   =
   
    
     R
     
      gap
      ⁢
      11
     
    
    +
    
     R
     
      gap
      ⁢
      12
     
    
    +
    
     R
     arm
    
    +
    
     R
     
      i
      ⁢
      r
      ⁢
      o
      ⁢
      n
     
    
   
  
  ,
  

  
   
    R
    
     i
     ⁢
     r
     ⁢
     o
     ⁢
     n
    
   
   =
   
    
     
      l
      b
     
     
      
       μ
       1
      
      ⁢
      
       S
       
        i
        ⁢
        n
       
      
     
    
    +
    
     
      l
      b
     
     
      
       μ
       1
      
      ⁢
      
       S
       out
      
     
    
    +
    
     
      l
      a
     
     
      
       μ
       1
      
      ⁢
      
       S
       1
      
     
    
   
  
  ,
  

  
   
    R
    arm
   
   =
   
    
     
      l
      8
     
     
      2
      ⁢
      
       μ
       1
      
      ⁢
      
       S
       
        i
        ⁢
        n
       
      
     
    
    +
    
     
      l
      8
     
     
      2
      ⁢
      
       μ
       1
      
      ⁢
      
       S
       out
      
     
    
    +
    
     
      l
      a
     
     
      
       μ
       1
      
      ⁢
      
       S
       2
      
     
    
   
  
  ,
  

  
   
    
     
      
       
        R
        
         gap
         ⁢
         11
        
       
       =
       
        
         x
         1
        
        
         
          μ
          1
         
         ⁢
         
          S
          in
         
        
       
      
      ,
     
    
   
   
    
     
      
       
        R
        
         gap
         ⁢
         12
        
       
       =
       
        
         x
         1
        
        
         
          μ
          0
         
         ⁢
         
          S
          out
         
        
       
      
      ,
     
    
   
   
    
     
      
       
        S
        1
       
       =
       
        
         π
         16
        
        ⁢
        
         (
         
          
           l
           1
          
          -
          
           l
           2
          
         
         )
        
        ⁢
        
         (
         
          
           l
           3
          
          +
          
           l
           4
          
          +
          
           l
           5
          
          +
          
           l
           6
          
         
         )
        
       
      
      ,
     
    
   
   
    
     
      
       
        S
        2
       
       =
       
        
         π
         4
        
        ⁢
        
         l
         8
        
        ⁢
        
         (
         
          
           l
           3
          
          +
          
           l
           4
          
          +
          
           l
           5
          
          +
          
           l
           6
          
         
         )
        
       
      
      ,
     
    
   
   
    
     
      
       
        l
        a
       
       =
       
        
         
          l
          5
         
         +
         
          l
          6
         
         -
         
          l
          3
         
         -
         
          l
          4
         
        
        4
       
      
      ,
     
    
   
   
    
     
      
       
        l
        b
       
       =
       
        
         
          l
          1
         
         +
         
          l
          2
         
        
        2
       
      
      ,
     
    
   
  
 

wherein S1 represents an equivalent cross-sectional area of a magnetic circuit in a horizontal direction of a first iron core; S2 represents an equivalent cross-sectional area of a magnetic circuit in a horizontal direction of the first armature; x1 represents an air gap of the first electromagnet; μ1 represents a magnetic permeability of materials of the first iron core, a second iron core, the first armature and a second armature; Rgap11 represents an air gap reluctance corresponding to an inner magnetic pole of the first armature; Rgap12 represents an air gap reluctance corresponding to an outer magnetic pole of the first armature; Rarm represents the reluctance of the first armature; Riron represents a reluctance of the first iron core; N1 represents the number of turns of the first coil of the first electromagnet 1; l1 represents a height of the first iron core; l2 represents a height of first coil of the first electromagnet; l3 represents an inner diameter of the first armature; l4 represents an inner diameter of the first coil of the first electromagnet; l5 represents an outer diameter of the first coil of the first electromagnet; l6 represents an outer diameter of the first iron core; l7 represents an outer diameter of the first armature; l8 represents a height of the first armature, la represents an intermediate calculation variable about l3, l4, l5 and l6; and lb represents an intermediate calculation variable about l1 and l2.