Efficiency-optimized direct torque control of synchronousreluctance motor using feedback linearization
Hyeoun-Dong Lee; Seog-Joo Kang; Seung-Ki Sul
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 1, Feb 1999 Page(s):192 - 198
Digital Object Identifier 10.1109/41.744411
Summary:In this paper, a nonlinear controller capable of high dynamic
torque regulation and efficiency optimization of the synchronous
reluctance motor (SynRM) using input-output feedback linearization is
proposed. The cross-coupling effects in the SynRM model and the torque
nonlinearity due to the iron losses in torque-speed characteristics of
the SynRM are discussed. The criterion for the efficiency optimization
is also introduced and investigated. Since the proposed nonlinear
controller directly regulates the torque by selecting the product of d-
and q-axes torque currents as one of the output variables, the nonlinear
and cross-coupling aspects between the d-and q-axes torque currents and
the terminal currents can he eliminated. Hence, the linear torque-speed
characteristic can be achieved. In addition, by controlling the power
loss-minimizing criterion directly, the proposed controller can optimize
the efficiency of the SynRM without deteriorating the dynamics
performance
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