DC-voltage and cycling induced recovery of switched polarisation in fatigued ferroelectric thin films
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Pure perovskite Pb(Sc1/2Nb1/2)O-3 thin films without pyrochlore phase were prepared by the sol-gel method on TiO2/Pt/TiO2/SiO2/Si substrates. Films exhibited (111) preferred orientation and columnar microstructure. Diffuse phase transitions with permittivi ...
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With brushless DC Motor (BLDC), current regulators in dq axes are very appreciated for sinusoidal supply. As the set current is constant, the regulator works properly. When the back-EMF is not sinusoidal, current oscillations appear in the dq regulator. A ...
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This set-up is particularly simple and makes possible the use of a flexible cable that may be plugged to the instrument using connectors for easy field applications. Measurements of AC and DC currents are demonstrated. ...
The brushless DC motors are normally built with rotor mounted PMs, which create the necessary back EMF voltage to produce a mechanical power. The shape of this back-EMF voltage is very important compared to the phase voltage supply one. Indeed, the electro ...
The present paper investigates transient overvoltages on ac induction motors when connected through a cable of arbitrary length to IGBT-PWM inverters. Considering classical transmission line analysis, and traveling-wave analysis with zero initial charges o ...
