Patent ID: 11962259
Assignee: CITY UNIVERSITY OF HONG KONG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A controller as claimed in claim 6, wherein the signal processor is adapted to determine the switch pattern by performing the steps of:
(a) mapping Uqref and Udref onto a new plane αβ according to the relations

Uαref=cos(θe)Udref−sin(θe)Uqref 

Uβref=cos(θe)Uqref+sin(θe)Udref 

where θe is the electrical angle of the rotor

(b) determining the amplitude Aref and angle θref from Uαref and Uβref according to the relations, A
   ref
  
  =
  
   
    
     U
     
      α
      ⁢
      ref
     
     2
    
    +
    
     U
     
      β
      ⁢
      ref
     
     2
    
   
   2
  
 

 
  
   θ
   ref
  
  =
  
   atan
   ⁡
   (
   
    
     U
     
      β
      ⁢
      ref
     
    
    /
    
     U
     
      α
      ⁢
      ref
     
    
   
   )
  
 

(c) determining new angle Υref, primary switch pattern vv1 and secondary switch pattern vv2 from a look up table dependent on θref;
(d) determining primary and secondary durations d1 and d2 according to the relation, d
    1
   
   
    sin
    ⁢
      
    
     ϒ
     ref
    
   
  
  =
  
   
    
     A
     ref
    
    
     0.597
     
      V
      
       d
       ⁢
       c
      
     
     ⁢
     
      sin
      ⁡
      (
      
       2
       ⁢
       
        π
        /
        3
       
      
      )
     
    
   
   =
   
    
     d
     2
    
    
     sin
     ⁡
     (
     
      
       π
       /
       3
      
      -
      
       ϒ
       ref
      
     
     )
    
   
  
 

(e) determining the switch pattern S for the next duty cycle according to the relation

S=d1vv1+d2vv2.