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In contrast to widely applied cogging torque (CT) or detent torque optimization methods, where well-known concepts for achieving a low-ripple torque as stator and/or rotor skewing are applied, this paper proposes an approach for shaping the stator geometry of a permanent-magnet (PM) synchronous machine, such that an arbitrary CT pattern can be obtained. This is achieved by an iterative algorithm,...
Several actuators (e.g. permanent magnet (PM) machines, magnet valves), sensors (e.g. reed sensors, Hall sensors, inductive proximity switches) and emerging inductive energy harvesting systems rely on a clean environment and/or well-defined magnetic conditions. However, in industrial environments iron dust or iron powder may be present, as e.g. resulting from machining, i.e. drilling or milling of...
Contactless speed sensors are used in a broad area of applications in various industries such as machining, assembly lines and transportation. Commonly used technologies are based on optics (e.g. cameras, encoders), or electromagnetic effects (e.g. variable reluctance sensors, Hall sensors). However, these sensors require a non-uniform property of the moving target that can be detected. For example,...
In contrast to widely applied permanent magnet (PM) machine optimization for minimization of cogging torque, this paper describes a method for shaping the cogging torque of a PM outrunner machine towards a desired sinusoidal torque pattern. The underlying goal of this approach is to compensate the cogging torque of a kinetic energy harvester (KEH) with the optimized counter cogging torque of a generator...
This paper proposes a novel type of watt-range permanent-magnet energy harvester, which harvests energy from a moving conductive body or surface without mechanical contact, as its operation is purely based on eddy-current coupling. The harvester's main advantage over existing solutions is that it allows energy transfer over atypically large (2 … 15 mm) air gaps, which are unavoidable in certain industrial...
Although Single-Sided Linear Induction Machines (SLIMs) have been analyzed and tested intensively as prime movers for different applications in literature, their application for energy harvesting has not been studied rigorously. This paper investigates the use of SLIMs for watt-range energy harvesting from a moving steel body with smooth surface (solid steel secondary) in order to supply control electronics...
A watt-range contactless electromechanical energy harvester based on the interaction of a rotating permanent magnet wheel with a moving conductive surface is analyzed, modeled and optimized. The extracted models are verified with two-dimensional (2-D) finite-element-method (FEM) simulations and measurement results. Finally, a ρη-Pareto optimization indicates a power density of the harvester wheel...
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