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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,...
This work describes a concept of a magnetically levitated homopolar bearingless slice motor in temple design. The proposed setup consists of two oppositely magnetized permanent magnets on the rotor and stator and provides high axial stiffness. The fluctuation of the air gap field for torque generation is generated with a cross-shaped rotor iron. Compared to a diametrically magnetized drive, this concept...
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,...
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...
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