Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

Sensorless Speed Direct Torque Control with Space Vector Modulation (DTC-SVM)
Based on this signals, the state variable of the drive can be indirectly calculated or
estimated what further allow to achieve the estimated (actual) rotor speed of PMSM.
Two motion sensorless control schemes of DTC-SVM for PMSM drive are presented in
Fig. 6.2
a)
U DC
Ω m _ ref
Ψ s _ ref
M e _ ref
e Me
∆δ
U
s α _ ref
U
s β _ ref
S
A
S B
S C
θ Ψ s
Ψ
s
I
s
U s
M e
I s
Ω m _ est
b)
U DC
Ω m _ ref
Ψ s _ ref
M e _ ref
e Ψ s
e M e
U sx _ ref
U sy _ ref
U
s α _ ref
U
s β _ ref
S A
S B
S C
Ψ
s
M
e
θ Ψs
U s
I
s
Ω m _ est
Figure 6.2. The DTC-SVM block schemes of PMSM without motion sensor: a) cascade
structure and b) parallel structure.
In motion sensorless PMSM drives, as shown in Fig.6.2, the position or speed
transducer (see Fig. 5.52) is replaced by a speed estimation block, which generates the
speed feedback signal Ω into the control systems and stator flux model.
m_
est
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