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Kinetics of a Rigid Body
Published in M Rashad Islam, A K M Monayem H Mazumder, Mahbub Ahmed, Engineering Dynamics, 2022
M Rashad Islam, A K M Monayem H Mazumder, Mahbub Ahmed
Moment of a force means the action of force which creates rotation of a body. Torque means the action of force which causes twisting of a body. However, both moment of a force and torque are mathematically the same. That is torque or moment of force about a chosen axis is the product of the force and its moment arm. A rigid body can rotate about a point. For example, a photograph can rotate about the point of contact between the nail and the thread from which the photograph is hung; the wheel of a vehicle can rotate about its axis. The magnitude of the moment of force or torque is measured by the product of the magnitude of the force and the perpendicular distance of the action of force from the axis of rotation.
Introduction to Electric Motors
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
Torque is a measurement of the turning force acting on an object to cause that object rotating or twisting about an axis or pivot. Torque, like work, is measured as Newton meter (Nm) in the International System of Units (SI system) or pound-foot (lbf-ft) in the English system. However, unlike work that only occurs during displacement, torque may exist even though no displacement or no rotation occurs. A typical example is the static holding torque.
Wind Power Security
Published in Maria G. Burns, Managing Energy Security, 2019
Torque, or “the moment of force” or “the twisting moment,” is a way of measuring the amount of energy generated when a twisting force hits an object (e.g., the wind hits the blades), causing its rotation. The spinning point is referred to as the rotation axis. Torque is measured in Newton-meters. It is mathematically symbolized as T = F * r * sin Θ
A Novel Method to Optimize Permanent Magnet Assisted Synchronous Reluctance Machines
Published in Electric Power Components and Systems, 2020
Thushanthan Mohanarajah, Mahmood Nagrial, Jamal Rizk, Ali Hellany
The torque is proportionate to flux, current, and sine angle of the two, which is equivalent to magnetic and electrical loadings of the machine. Figure 4(a) is considered as the base design (SynRM) with simplified flux barrier, and the other four designs have PMs in the barriers in various quantities as shown in Figure 4(b–e). The PMs are added in barrier linear section along the Q –axis in these designs. The quantity of PM in design II is significantly smaller than that of design III and so forth. The radial webs of designs IV and V is removed to accommodate PMs. Therefore, its saliency ratio will be slightly better than the other two designs. The torques as a function of instantaneous time of all models are shown in Figure 5. The simulation is performed with fine time steps to improve the resolution of torque variation at maximum torque per ampere for each design (MTPA)
Helical probe tests in residual soils of the Appalachian Piedmont
Published in Geomechanics and Geoengineering, 2018
Shehab S. Agaiby, Zhongkun Ouyang, Paul W. Mayne
For the operation of the helical probe, a beam style torque wrench is fitted to the hex coupler using a socket. The rods are then rotated by hand using the wrench at about 90°/s while the peak torque is noted. The value of torque is used as a measure, usually in either units of inch-pounds (in-lb) or Newton-meters (N-m). Setup calibration of the HPT is achieved by correlating side-by-side data from the user’s preferred standardized test method that is discussed in the following sections.