Doubly salient wound field machines exhibit the advantages of robust structure and controllable flux, hence have been utilized as generators in applications automobiles renewable energy. However, inherent unbalanced phase back-electromotive force (EMF) waveform caused by asymmetric flux path brings difficulties for precise control smooth operation. To solve problem back-EMF conventional doubly ...

In hydrogen recirculation side channel pumps, the motor rotor is exposed to a high-pressure mixture of steam and hydrogen, which makes embrittlement occur in permanent magnets (PMs). A protective coating necessary for PMs hydrogen. However, process sleeve interference installation, easily damaged. This paper proposes two surface-mounted insert magnet (SIPM) synchronous topologies, SIPM1 SIPM2, ...

First, the measuring principle, the weight function, and the magnetic field of the novel downhole inserted electromagnetic flowmeter (EMF) are described. Second, the basic design of the EMF is described. Third, the dynamic experiments of two EMFs in oil-water two-phase flow are carried out. The experimental errors are analyzed in detail. The experimental results show that the maximum absolute v...

In this paper, an adaptive sliding mode observer (ASMO) associated with a phase locked loop (PLL) is assessed for the sensor-less control of rotor-tied doubly-fed induction generator (RDFIG). proposed PLL-ASMO estimator, ASMO utilizes stator current, voltage, and back electromotive force (EMF) as state variables. The used in order to estimate back-EMF from which slip position/speed extracted us...

We measured the emf of a sodium ion-selective electrode in NaCl-NaHCO3 solutions (160 mmol of Na+, 160-120 mmol of Cl-, and 0-40 mmol HCO3- per liter) with a home-built cell in steady-state after 10 min and with two commercial direct potentiometric analyzers about 20 s after the sample was introduced. Substitution of HCO3- for Cl- resulted in a small decrease in emf. We calculated the effect of...

This study aimed to develop a three-phase permanent-magnet synchronous motor drive system with improvement in current harmonics. Considering the harmonic components induced electromotive force of motor, offline response (EMF) was measured for fast Fourier analysis, main were obtained, and voltage required reduce corresponding direct (d-axis) quadrature (q-axis) axes calculated. In closed-loop c...

Hardware complexity of a motor drive can be reduced by estimating controls rather than measuring using sensors. In this way the corresponding sensors are eliminated and the system becomes more robust. This article is about speed control of a sensor less induction motor with predictive current controller technique. This particular speed control technique does not require direct measurements of m...