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This paper deals with two different observers for sensorless DTC-controlled induction motor (IM) drives. First is sliding mode observer (SMO), second is extended Kalman filter (EKF). The main objective of this paper is experimental analysis of limits of these observers and their behavior in challenging low-speed region. Theoretical conclusions presented in this paper are verified by experiments made...
Multi-phase ac motor drives are nowadays considered for various applications, due to numerous advantages that they offer when compared to their three-phase counterparts. Variable speed induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. This paper analyses operation of a Model Reference Adaptive System (MRAS)-based sensorless...
This paper presents an application of induction motor mechanical speed and load torque observers in high-speed train drives. The observers are applied for a 1.2-MW electric drive with an induction motor. The goal of using such observers is to utilize computed variables for diagnostic purposes of speed sensors and torque transmission system. The concept of diagnostic system is presented in this paper,...
This contribution deals with design of sliding mode based stator flux observer for direct torque and flux controlled induction machine drives. Proposed flux observer is completed by simple estimation of rotor speed in order to achieve a sensorless drive control. Proper function of presented sensorless control is verified by both simulations and experiments made on designed laboratory prototype of...
The paper presents a new numerical integration routine BGKODE_DSP. This routine is based on BGKODE routine, which forms a practical application of the Kroghpsilas algorithm. BGKODE_DSP routine realizes the predictor-corrector method and has been simplified to ensure its applicability in real time systems. The results of the comparison between the selected common numerical integration methods and the...
The paper discusses the design of synchronous reference frame current controllers for a sensorless induction motor (IM) drive that operates in speed regulation mode or torque control mode. In most IM implementations, PI controllers alone are used for current regulation because of convenience. The reference values fed in the current controllers are either preselected or are synthesized by flux, speed...
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