| 摘要 |
PURPOSE:To eliminate the influence of variation in the rotational frequency of a rotor by providing two adding and substracting circuits which calculate the sum of and difference between outputs of two coils at an adequate gain ratio and leading out their outputs as phase compoents corresponding to two reference coordinate axes. CONSTITUTION:A phase correcting circuit consists of the 1st adding and subtracting circuit 2 and the 2nd adding and subtracting circuit 3. when reference signal detecting oils L1 and L3, and L2 and L4 have fitting error angles and beta, the gains of reference signals e1 and e2 applied to input terminals 4 and 5 are denoted as K1 and K2 as to the 1st circuit 2, or as K3 and K4 as to the 2nd circuit 3. In this case, K2/K1 and K4/K3 are so selected that equationsI and II hold, thus obtaining reference signals shifted in phase to zero. |
