This paper presents a new approach based on the use of a knowledge base, in order to improve the angular resolution of the permanent magnet (PM) stepper actuator. The use of this technique is justified by the limits of the conventional technique when the static torque characteristic is high nonlinear. The conventional open loop microstepping technique which realised by a Pulse Width Modulation ...

Open-loop control of stepper motors reduces system cost and complexity for positioning systems. To produce a precise current waveform, novel open-loop implementation hysteresis controller is presented compared to the existing pulse-width modulation method. The new method extends resolution available given sampling rate, allowing finer motor current. Applications precision minimize external dist...

Shaking tables are frequently used to determine the dynamic behavior of structures in laboratory environment. In order obtain realistic results experimental studies, table response and performance should be consistent with desired motion. this multidisciplinary study, an application a new method for determining calibrating mechanical developed bi-axial displacement controlled shake according mo...

Two novel devices, torsional actuator and torsional stepper motor, are described and their performance is investigated in detail. Both devices were designed to produce large angular displacement and large torque output from the piezoelectric d15 shear response. In the torsional actuator, the large displacement can be achieved due to built-in amplification of piezoelectric strain using the aspec...

The main advantage of linear motors is that they do not turn the electric energy supplied into a rotary movement, but convert it directly to a linear movement. The direct coupling of the mover armature to the load provides several performance benefits in addition, as high speeds, high precision, no backlash, high stiffness and fast response and settling times. In these circumstances it is inter...

We reinvestigated the organization of the premotor cortex (PM) using intracortical microstimulation. Movements of forelimb, hindlimb, and orofacial structures were evoked from broad regions of PM that appeared to be contiguous with other motor areas. There were two principal findings: (1) the somatotopy of PM lies roughly parallel to that of the primary motor cortex (MI). Forelimb movements wer...