Permanent-magnetic gears are magneto-mechanical devices that are widely used to replace the ordinary mechanical gears and to transmit torque without any mechanical contact. The transmitted torque is one of the most important properties of magnetic gears. The torque characteristics of radial type permanent magnetic gears are investigated using ANSYS Program. The Maxwell stress tensor technique i...

PURPOSE This study aimed to assess the combined effect of dismantling before sterilization and aging on the accuracy (±10% of the target torque) of spring-style mechanical torque devices (S-S MTDs). METHODS Twenty new S-SMTDs from two different manufacturers (Nobel Biocare and Straumann: 10 of each type) were selected and divided into two groups, namely, case (group A) and control (group B). ...

Increasing the level of transparency in rehabilitation devices has been one of the main goals in robot-aided neurorehabilitation for the past two decades. This issue is particularly important to robotic structures that mimic the human counterpart’s morphology and attach directly to the limb. Problems arise for complex joints such as the human wrist, which cannot be accurately matched with a tra...

Wrinkles as intrinsic topological feature have been expected to affect the electrical and mechanical properties of atomically thin graphene. Molecular dynamics simulations are adopted to investigate the wrinkling characteristics in hydrogenated graphene annulus under circular shearing at the inner edge. The amplitude of wrinkles induced by in-plane rotation around the inner edge is sensitive to...

This paper deals with a way of computation of the mechanical behavior of Permanent Magnet synchronous couplings . This method is based on the calculation of the forces between the magnets of the device. The formulation of these forces is based on magnetic pole theory. The computation is done using a semi-numerical integration method. This method has been validated in test cases and appears to b...

During the last decades, the rapid development of power semiconductor devices has allowed the increased use of adjustable speed ac drives in a variety of applications, especially in the process-control industry. In many applications, the capability of controlling the speed effectively can improve the efficiency of the ac motors and thus lead to large savings in energy. Among the several approac...

Electrical Drive An electric drive is a system that converts electrical energy into mechanical energy. It also provides electrical control of the whole process through several devices and technologies (Figure 1). The objective is to create a smooth and versatile control to achieve a specifi c speed-torque characteristic. It is a key component of the power conversion chain between power sources ...

The measurement of time–varying forces and torques applied to flexible mechanical structures cannot be pursued by relying on quasi–static approximations. However the problem can be casted as a problem of system inversion, provided reliable models of the dynamic relationship among force/torques and measurement gauges are available. Within this framework, it is possible in particular to define op...

Hybrid Stepper Motors (HSM), together with the microstepping driving technique, are widely used in many motion control applications, given their low cost and high reliability. On the other hand, being controlled in an open loop fashion, they cannot achieve high levels of performance, this mainly due to the absence of a load-side position sensor. In this paper, we address the problem of controll...