Sensorless induction motor drive with a single DC-link currentsensor and instantaneous active and reactive power feedback
Vukosavic, S.N.; Stankovic, A.M.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 1, Feb 2001 Page(s):195 - 204
Digital Object Identifier 10.1109/41.904580
Summary:This paper proposes a novel torque and speed control structure for
low-cost induction motor variable-speed drives with a single DC-link
current sensor. The controller is based on reconstruction of the active
and instantaneous reactive power from the DC-link current without the
use of a shaft sensor. An effective way of achieving tracking of set
values of motor torque and flux is to base the estimation on the
instantaneous active (P) and reactive power (Q). The paper proposes a
way for extracting instantaneous P and Q information from the DC-link
current and the pulsewidth modulation pattern. Torque and flux
controllers suitable for general purpose and traction applications are
proposed. The paper presents analytical considerations, straightforward
design guidelines, and experimental results obtained from a traction
system with a battery-fed three-phase inverter and a 7.5 kW traction
motor
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