文档介绍：476 IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 39, NO. 2, MARCH/APRIL 2003
Performance Analysis of a Speed-Sensorless
Induction Motor Drive Based on
a Constant-Switching-Frequency
DTC Scheme
Domenico Casadei, Associate Member, IEEE, Giovanni Serra, Associate Member, IEEE, Angelo Tani, Luca Zarri,
and Francesco Profumo, Senior Member, IEEE
Abstract—A control technique, which utilizes the stator flux the basic DTC scheme with the aim of improving the drive per-
components as control variables, has been applied to a speed-sen- formance. The mands are the torque and the rotor flux,
sorless induction motor drive. The scheme may be regarded as a whereas the control variables are the stator ponents.
development of a direct torque control scheme, aimed at achieving
a constant-switching-frequency operation. At each sampling pe- The principle of operation is based on driving the stator flux
riod the required voltage vector is calculated on the basis of the vector toward the corresponding reference vector defined by the
error between the reference and the estimated stator flux vector. mands. This action is carried out by the space-vector
The problems related to the voltage-source inverter dead time and modulation (SVM) technique, which applies a suitable voltage
the stator flux estimation at low speed have been analyzed, and an vector to the machine in order pe