A new sensorless scheme for high-performance speed control of permanent-magnet ac motors (PMACMs) driving an unknown load is proposed. This scheme uses an extended nonlinear reduced-order observer to estimate the induced ...

The determination of the torque in wheeled agricultural tractors complements the traction tests and allows the calculation of the distribution of tractive efforts between the axles. The main objective of this research was ...

In machine tools, ball screw drives are the most widely used linear actuators due to their high efficiency and positioning accuracy. A ball screw drive is composed of a shaft with helical grooves, a nut system with helical ...

Induction motors are widely used in several industrial sectors. However, the dimensioning of induction motors is often inaccurate because, in most cases, the load behavior in the shaft is completely unknown. The proposal ...

Field observations and laboratory experiments show that temperature cycles can lead to wedging and accumulation of permanent displacements in several geosystems. The magnitude of these displacements depends on the geometric ...

t To improve hexavalent chromium (Cr(VI)) retention of montmorillonite (Mt) at pH 3, Mt sample was subjected to different treatments: thermal ones at 600 °C or 950 °C, 2 h, or mechanical grinding for 300 s. Then, the ...

Induction motors are widely used in several industrial sectors. However, the dimensioning of induction motors is often inaccurate because, in most cases, the load behavior in the shaft is completely unknown. The proposal ...

This paper presents the simulation and implementation of a electrodynamometer to be enabled in the laboratory to emulate different dynamic mechanical loads. The simulation uses the model of permanent magnet synchronous ...