System Optimization of Motor Resolver including Drive Circuitry and ...

Resolver-to-Digital Converter
Classical RDC Algorithm
Resolver:
V_excitation = U1*sin(2*PI*Freq*t)
V_Out_Sin = U2*sin(2*PI*Freq*t)*sin(Thita)
V_Out_Cos = U2*sin(2*PI*Freq*t)*cos(Thita)
RDC:
90 Degree Phase shift:
V_Out_Sin_1 = U2*sin(2*PI*Freq*t+90deg)*sin(Thita)
= U2*cos(2*PI*Freq)*sin(Thita)
Summation:
V_sc = V_Out_Sin_1 + V_Out_Cos
= U2_2 *sin(2*PI*Freq*t + Thita)
Magnitude Match:
V_sc_1 = U1 *sin(2*PI*Freq*t + Thita)
Comparison:
V_excitation = U1*sin(2*PI*Freq*t)
V_sc_1 = U1 *sin(2*PI*Freq*t + Thita)
45.20
20.00
Rotor_Position
Position_out_final
2DGraphSel1
0
0 25.00m 50.00m 75.00m
Us1
Uc1
TRANS1
TRC Vin >= 0
STATE2
SET: Vin_ref:=-1
FML_INIT1
ICA:
Vin_ref:=0
Vo_square:=0
TRANS7
Phase Shift Magnitude Match
+
C1
R1
R2
+
OPV51
-
R3
STATE1
SET: Vin_ref:=1
TRANS2
TRC Vin < 0
V VM2
R4
R5
Position
EQU
Pulse_pos:=abs(Vin_ref+Vo_square)/2
Position_out:=0
Position_out_temp:=0
STATE7
SET: t1:=t
TRC (GZ1.VAL > 0) AND (Pulse_pos =0)
STATE8
SET: t2:=t
SET: t3:=t2-t1
TRANS8
SET: Position_out :=Input_AC_Freq*t3*180
+
OPV52
-
R6
WAIT
TRC (GZ1.VAL < 1) AND (Pulse_pos = 1)
TRANS3
R7
TRC VM1.V >= 0
STATE4
SET: Vo_square:=-1
FML_INIT2
ICA:
t1:=0
t2:=0
+
OPV53
-
R8
Delay
GZ1
NEW_MAX
STATE3
+
V
SET: Vo_square:=1
TRANS4
TRC VM1.V < 0
ICA:
VM1
Position_out_final:=0
TRC Position_out>Position_out_final
STATE5
TRANS5
SET: Position_out_final:=Position_out
Classical RDC (Resolver-to-Digital Convertor)
True