Patent ID: 11870312
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The field coil type rotating electric machine as set forth in claim 1, wherein the rotating electric machine has a characteristic such that torque of the rotating electric machine increases as a frequency of the harmonic currents supplied to the phase windings of the stator coil approaches a resonance frequency of the series resonant circuit,
a reference frequency f0, a lower limit frequency fL and an upper limit frequency fH, which respectively represent a value of the frequency of the harmonic currents at which the torque of the rotating electric machine becomes highest, the lower one of two values of the frequency of the harmonic currents at which the torque of the rotating electric machine becomes equal to an allowable lower limit and the higher one of the two values, satisfy the following mathematical expression (c1):, fL
          =
          
           
            (
            
             1
             -
             A
            
            )
           
           ⁢
           f
           ⁢
           0
          
         
         ,
        
       
       
        
         0
         <
         A
         <
         1
        
       
      
      
       
        
         
          fH
          =
          
           
            (
            
             1
             +
             B
            
            )
           
           ⁢
           f
           ⁢
           0
          
         
         ,
        
       
       
        
         0
         <
         B
         <
         1
        
       
      
     
     }
    
   
   
    
     (
     c1
     ), where A and B are predetermined real numbers, and
the inductances of the first and second windings are set to further satisfy the following mathematical expression (c2):, 1
       
        
         (
         
          1
          +
          B
         
         )
        
        2
       
      
      <
      
       
        L
        ⁢
        2
       
       
        L
        ⁢
        1
       
      
      <
     
     ⁢
     
      1
      
       
        (
        
         1
         -
         A
        
        )
       
       2
      
     
    
   
   
    
     (
     c2
     ), where L1 is the inductance of the first winding and L2 is the inductance of the second winding.