The isolated three-level DC/DC converter (ITLDC) can be used to charge electric vehicles. During the constant current charging stage, ITLDC designed realize nature zero voltage switching (ZVS). However, during is small; thus, ZVS cannot realized. This paper presents an active commutation auxiliary circuit (ACAC) for full load range ZVS. With proposed ACACs, all main switches achieve zero-voltag...

Machine tool rams are important constructional elements found on vertical lathes as well many other machines. In most cases, a machine ram constitutes an assembly with significant dynamic compliance that affects the machine’s ability to achieve stable cutting conditions. There various solutions for increasing ram’s stiffness and damping. This paper describes innovative concept of two-axial elec...

Recently developed, second-order sliding-mode control (2-SMC) algorithms are analyzed to assess their global convergence properties. While standard first-order sliding-mode control (1-SMC) algorithms derive their effectiveness from the global solution of the well known “reaching condition” _ ( = 0 being the actual sliding manifold), 2-SMC is based on more complex differential inequalities, for ...

The mathematical formalism for linear quantum field theory on curved spacetime depends in an essential way on the assumption of global hyperbolicity. Physically, what lie at the foundation of any formalism for quantization in curved spacetime are the canonical commutation relations, imposed on the field operators evaluated at a global Cauchy surface. In the algebraic formulation of linear quant...

This study tackles to develop a sensorless drive technique for brushless dc motors (BLDC) by using wavelet theory. Initially a BLDC motor with hall sensors is handled. The simulink model of the motor is established and the simulation performances are obtained. Then BLDC motor’s PWM pulses are produced by DS2201 dSPACE digital signal processing (DSP) rapid control prototyping kit. The time domai...