The historical manufacturer of electric traction machines for trams and trolleybuses, the innovative commercial company UMEB, has initiated a joint project with National Institute Research Development Electrical Engineering ICPE-CA, to design produce new line that achieve desired power, starting torque, speed range operating temperatures. Following requests received by UMEB from integrators veh...

Position estimation at low/zero speed for permanent magnet synchronous machines is commonly achieved with the injection of high-frequency signals. This article presents a new sensorless scheme that accurately observe rotor angle low speeds, including standstill condition, without injecting The algorithm built upon previous sliding-mode current controller and uses switching functions slopes inac...

The suppression of the regenerative chatter phenomenon in turning process via the variation of the frequency and amplitude of the spindle motor excitation is carried out in this research. A programmable inverter is employed for variable periodic excitation of the spindle motor. A set of turning experiments is designed and performed on a number of conical work pieces both in constant spindle spe...

Objectives: This paper describes further improvement and preliminarily evaluation of a novel viscoelastic ankle-foot prosthesis prototype. The objective was to control the ankle hysteresis at slow and normal walking speeds. Methods: Inspired by the ankle biomechanics, in which the hysteresis differs based on the gait speeds, a manually damping control mechanism imbedded in the prosthesis for...

In this paper we present a design procedure for disturbance attenuation with internal stability of a rotor supported by mag netic bearings over the whole interval of the rotor operating speeds The nonlinear gyroscopic equations can be simpli ed to a set of linear time varying di erential equations owing to the linear dependence of the rotor speed in the plant dynam ics For rotors operating in h...

This article presents an innovative energy recovery shock absorber system for motorcycles. The is named synchronous pulley - harvesting (SP-EHSA). SP-EHSA the first specifically designed to maximize of motorcycles without compromising their dynamic behavior. Throughout article, theoretical design, computer modeling, optimization, and testing are presented. results in a validated model absorber....

Many modern machine learning (ML) algorithms are iterative, converging on a final solution via many iterations over the input data. This paper explores approaches to exploiting these algorithms’ convergent nature to improve performance, by allowing parallel and distributed threads to use loose consistency models for shared algorithm state. Specifically, we focus on bounded staleness, in which e...

This paper proposes a variable speed control scheme of grid-connected wind energy conversion system, WECS, using permanent magnet synchronous generator. The control algorithm tracking the maximum power for wind speeds below rated speed of wind turbines (WTs) and ensure the power will not exceed the rated power for wind speeds higher than the rated speed of wind turbine. The control algorithm em...

This paper presents the parameters of permanent magnet synchronous motor i.e. speed (r), stator resistance (RS), q-axis inductance (Lq), and torque (Ts) is to be estimated by using Model Reference adaptive System(MRAS). To improve the performance of speed sensor less permanent magnet synchronous motor drives, especially at low speeds by identifying stator resistance together with speed. Severa...

In this paper, two promising multi-megawatt wind turbines equipped with a doubly-fed induction generator-based partial-scale and a permanent magnet synchronous generator-based full-scale two-level power converter are designed and compared. Simulations of the two configurations with respect to loss distribution and junction temperature variation for the power device over the entire wind speed ra...