2 research outputs found
Feed-forward Torque Control of Interior Permanent Magnet Brushless AC Drive for Traction Applications
This paper presents a feed-forward torque control
(FTC) technique for interior permanent magnet (IPM) brushless
AC (BLAC) drives in traction applications. It is shown that by
adopting the Newton-Raphson iterative method for solving the
proposed high-order nonlinear relationship between the torque
demand, flux-linkage and desirable dq-axis currents, FTC with
due account of nonlinear machine parameters can be achieved
for IPM BLAC drives. It is also proven that the comparison
between the reference voltage magnitudes under maximum
torque per ampere (MTPA) and field-weakening (FW)
operations together with online base speed determination can be
utilized for FW operation activation to achieve full exploitation
of the available DC-link voltage during the transition between
the constant torque and FW operation regions. Since both the dqaxis
current references and the base speed for FW operation
activation are computed online, the proposed FTC technique
provides flexibility for online parameter update or estimation
and is able to cope with wide DC-link voltage variation. The
proposed FTC strategy is experimentally validated by
measurements on a 10kW wide constant power speed range
(CPSR) IPM BLAC machine drive