Speed and torque controls of permanent magnet synchronous motors are usually attained by the application of position and speed sensors. However, speed and position sensors require the additional mounting space, reduce the reliability in harsh environments and increase the cost of a motor. Therefore, many studies have been performed for the elimination of speed and position sensors. This paper i...

1,2 Department of EEE, Sree Buddha College of Engineering, Pattoor, Alappuzha Abstract— Model Reference Adaptive System (MRAS) based speed sensorless estimation of vector controlled induction motor drives are presented in this paper. New speed and current estimation techniques are presented. These are used to formulate a single current sensor based vector controlled drive. The proposed method i...

A modified integral sliding mode control-based adaptation algorithm (MISMCA) is described to enhance performance of sensorless rotor flux model-reference-adaptive-system (RF-MRAS) induction motor drive (IMD). At low speed regions, RF-MRAS not guaranteed due conventional PI-based (PIA) and parameter uncertainties, especially time constant. In order improve RF-MRAS, the PIA replaced by an based o...

this paper proposes a new method of gain scheduling control design for a nonlinear system which is described as linear parameter varying form. a performance measure based on linear matrix inequality is introduced. to consider stability and performance measures in design process, the h∞ loop-shaping method is used to design the local controllers, which can be described as state feedback observer...

BACKGROUND Mineralocorticoid receptor antagonists (MRAs) have been associated with improved patient outcomes in patients with heart failure with reduced ejection fraction (HFrEF) but not preserved ejection fraction (HFpEF). We conducted a systematic review and meta-analysis of selective and nonselective MRAs in HFrEF and HFpEF. METHODS We searched Cochrane Central Register of Controlled Trial...

To enhance the anti-inertia disturbance ability of permanent magnet synchronous motor (PMSM) speed system, an adaptive sliding mode control with inertia identification is proposed. A novel (NSMC) based on a new reaching law coupled model reference system (MRAS) realized control, named MRAS+NSMC. In NSMC construct process, integral surface and variable are introduced to avoid differentiation imp...

While the Expectation-Maximization (EM) algorithm is a popular and convenient tool for mixture analysis, it only produces solutions that are locally optimal, and thus may not achieve the globally optimal solution. This paper introduces a new algorithm, based on the global optimization algorithm Model Reference Adaptive Search (MRAS), designed to produce globally-optimal solutions in the estimat...

AIM To compare the quality of magnetic resonance angiographies (MRAs) performed with different contrast agents and to evaluate the effect of body mass index (BMI) and ejection fraction (EF) on the quality of these MRAs. MATERIALS AND METHODS 120 patients between the age of 43 and 86 years were subjected to MRAs with different contrast agents (Gadobutrolum, Dimeglumini gadobenas, Gadofosveset ...