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This paper addresses the design and manufacturing of small-scale square planar coils with inductance densities ranging from 2 to 19 $\mu \text {H}\cdot \text {mm}^{-2}$ . The design strategy is based on both analytic formulas and finite-element method. Two different manufacturing techniques, based on copper and aluminum, respectively, are used for the coils fabrication, and the key aspects as well...
The modification of the torque-speed characteristic can be achieved by changing the connection between the coils from star to delta. During the reconfiguration process, depending on the strategy used, a torque interruption or jolts can occur. In this paper, we propose a novel strategy that suppresses these torque variations. The proposed approach is based on a fine control of the phase currents through...
The torque transient behavior during winding reconfiguration of a brushless motor is investigated in order to suppress torque interruptions or jolts. This reconfiguration changes the intrinsic torque-speed characteristic of the motor. A simpler approach using the alternation on and off (block commutation) of phase currents as well as an adaptation of the current amplitude depending on the transient...
In this paper, a MEMs relay for high power application is investigated. This relay has to hold a current of the order of magnitude of the Ampere and is subject to harsh environment such as high temperature or vibrations which can lead to a premature dysfunction. The paper presents an analytical modelling of the relays considering the geometry, the contact resistance and also the effect of vibrations...
Commonly, reconfiguring the winding in order to modify the torque-speed characteristic can be achieved by changing the coils configuration from series to parallel. This may produce an unwanted voltage unbalance between parallel conductors and circulating currents may appear. These currents produce losses that are usually neglected but they become significant the more the motor rotates rapidly. In...
In this paper, the magnetic coupling between an induction cooker and a metallic pot is studied for various winding topologies. Effects of the winding orientation on the power transfer capability and on the emitted magnetic field under the cooker are discussed and compared. A novel topology inspired by permanent magnet Halbach array is proposed. This consists in coupling in both horizontal and vertical...
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