Datasheet

TMC4671 Datasheet • IC Version V1.3 | Document Revision V2.00 • 2020-Apr-17
38 / 142
U_UVW_FOC3(U_D, PHI_E) =









U
U
(φ
e
) = U
D
· sin(φ
e
)
U
V
(φ
e
) = U
D
· sin(φ
e
+ 120
o
)
U
W
(φ
e
) = U
D
· sin(φ
e
− 120
o
)
(18)
I_UVW_FOC3(I_D, PHI_E) =









I
U
(φ
e
) = I
D
· sin(φ
e
)
I
V
(φ
e
) = I
D
· sin(φ
e
+ 120
o
)
I
W
(φ
e
) = I
D
· sin(φ
e
− 120
o
)
(19)
4.5.2 FOC2 - Stepper Coil Currents I_X, I_Y and associated Voltages U_X, U_Y
For two-phase motors (stepper) with four terminals UX1, VX2, and WY1, Y2, voltage U_Ux = U_X1 - U_X2 is
in phase with the measured current I_X and U_Wy = U_Y1 - U_Y2 is in phase with the measured current I_Y
according to equations (20) and (21) for FOC2.
U_XY_FOC2 =



U
X
(φ
e
) = U
X
· sin(φ
e
)
U
Y
(φ
e
) = U
Y
· sin(φ
e
+ 90
o
)
(20)
I_XY_FOC2 =



I
X
(φ
e
) = I
D
· sin(φ
e
)
I
Y
(φ
e
) = I
D
· sin(φ
e
+ 90
o
)
(21)
4.5.3 FOC1 - DC Motor Coil Current I_X1, I_X2, and associated Voltage U_X1, U_X2
For DC motor with with two terminals UX1, VX2, voltage U_X = U_X1 - U_X2 is in phase (same sign) with the
measured current I_X. U_X is in phase (same sign) with the measured current I_X according to equations
(22) and (23) for FOC1.
U_XY_FOC1 = U
X1
− V
X2
(22)
I_XY_FOC1 = I
X1
(23)
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