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Eddy current brakes having advantages such as contactless operation offer an alternative to conventional frictionbased brakes. The flux source in an eddy current brake can be produced by permanent magnets or electrically excited windings. The former eliminates the need for an external supply, whereas the latter provides good control capability for the device. Herein, in order to take the advantages of both mentioned types, a hybrid electromagnetic brake is introduced, and the corresponding design guidelines for the brake part, the complementary part, i.e., the power generating unit, and the interface circuit are presented. Also, design considerations, as well as performance indices associated with the proposed configuration, are discussed. Moreover, the finite-element method is employed in the analyses and verifications of the design. Finally, a prototype has been manufactured whose results validate the simulation investigations and the design outcomes.Index Terms-Axial-flux, design, eddy current (EC), hybrid brake, optimization, permanent magnet synchronous generator (PMSG).

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The objective of this paper is to present the design equations of the conventional double-sided axial-flux slotless brushless DC machine (BLDC) and the new one with the trapezoidal cross-section core as well as performances comparison based on the proposed design algorithm. Direct search method is used to find the optimum designs, whereas machines with the rated power of 0.25-10 kW are compared. Efficiency and size of the optimum designed machines are presented to make a comprehensive study for choosing the best topology from the viewpoint of electrical and geometrical characteristics. Finite element analysis and experimental results are presented to show the validity of the derived equations and the design outcomes.

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Introduced by the authors, the hybrid electromagnetic brake (HEB) has considerable advantages over conventional friction and hybrid brakes. One of its advantages is the controllability of the brake system even when the HEB is integrated in a vehicle. Therefore, in this paper, robust speed and slip control schemes for HEB systems taking into account the brake and vehicle dynamics are developed for uncertain system parameters, and unknown external disturbance conditions, owing to neural networks learning and adaptation abilities. The presented robust control schemes exhibit advantages such as not requiring exact information about the brake and vehicle parameters for the controller design, and that the control algorithm is capable of efficiently tracking performance while ensuring the stability of the closed-loop system. The controllers are suitable for many vehicle active safety control systems such as, adaptive cruise control, anti-lock braking systems, electronic stability control, rollover prevention and autonomous vehicle operations. Both simulations and experiments are presented to show the controllers performances and the effectiveness of the presented control schemes.