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Parameter identification of an induction motor (IM) at standstill based on Recursive Least Squares (RLS) essentially requires the derivative terms of the stator voltages and currents. However, the use of the analog or digital differentiators will greatly increase the complexity of identification algorithm and reduces the system reliability. In this paper, a simple parameter identification algorithm...
This paper presents a new method to estimate the electrical parameters of an induction motor (IM) fed by Voltage Source Inverter (VSI) using Recursive Least Squares (RLS) method. The estimation model is derived from the dynamic model of the induction machine at standstill. No prior knowledge of the motor parameters is required and four electrical parameters of the IM are simultaneously estimated with...
A modified speed sensorless direct torque control (DTC) scheme for surface permanent magnet synchronous machine (SPM) is investigated in this paper, which features in very low flux and torque ripple and almost fixed switching frequency. Instead of the switching table and hysteresis controllers in the basic DTC, a reference flux vector calculator (RFVC) is used to determine the reference stator flux...
For speed sensorless stator-flux-oriented control (SFOC), the accuracy of the estimated flux position decides the performance of the speed sensorless drive. In this paper, a novel flux estimation method is proposed in which the pure integrator is replaced by a low pass filter (LPF) to resolve the DC-drift and saturation problem and the phase error with the LPF is approximately compensated by the reference...
Multiphase motor drives have many advantages over the traditional three-phase motor drives. In this paper we firstly deduce the mathematic modeling for a dual-three-phase permanent magnet synchronous motor (PMSM) according to vector space decomposition theory. Then, a sensorless vector control based on the model reference adaptive system (MRAS) is developed for a dual-three-phase PMSM and the system...
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