The paper develops and compares intelligent sensors for flux and torque estimation in permanent magnet synchronous motors (PMSM) based on combined voltage-current flux estimators and interpolating implementation. Typical applications are in the direct torque and flux control (DTFC) and in the field-oriented vector control of ac drives. Simulation results using a PMSM drive system prove good dynamic performances of the flux and torque sensors to parameter deviations in wide speed range.

This paper discusses the design and implementation of a new industrial water level measurement and control system. Virtual Instrument technology is employed to construct the software and hardware framework. The modularized system features high flexibility and expandability. The system provides with parameter display, data testing, alarming, storage and printing. The system is opening and compatible.

The paper describes construction and technical parameters of the low-distortion Wien type oscillator determined for dynamic testing of high resolution ADCs in frequency range up to 2 MHz.

In the framework of laboratory exercises for students attending lectures on metrology of electrical quantities at the Faculty of Electrical Engineering, Czech Technical University, application of inductive voltage dividers to precision coaxial bridges is demonstrated. Four terminal-pair bridges are used in comparisons of like impedances and a quadrature bridge has been realized for linking resistance and capacitance standards. A method for calibrating multi-decade inductive voltage dividers has also been developed.

In the paper the Zero-Crossing-Sequence Shape method is described. The method effectively classifies the M-ary PSK and M-ary FSK modulated signals detecting both the phase and frequency shifts in the incoming signal by using the zero-crossing and instantaneous frequency variation sequences. Moreover, from these sequences, independently from the modulation classification, the Carrier-to-Noise-Ratio (CNR), the carrier frequency and the symbol rate are also determined. In order to make the method able to operate at lower CNR, preprocessing of the instantaneous frequency sequence and statistic hypothesis are assumed. Experimental results confirm both the high accuracy and the performance of the method.