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Abstract-The application of direct torque control (DTC) to brushless ac drives has been investigated extensively. This paper describes its application to brushless dc drives, and highlights the essential differences in its implementation, as regards torque estimation and the representation of the inverter voltage space vectors. Simulated and experimental results are presented, and it is shown that, compared with conventional current control, DTC results in reduced torque ripple and a faster dynamic response.Index Terms-Brushless dc (BLDC) drives, direct torque control (DTC), permanent-magnet motor.

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In this paper, a performance comparison between the novel axial flux magnetically geared machines (AFMG) and the conventional axial flux YASA machine is presented. The AFMG and YASA machines have the same stator construction in which segments are equipped with concentrated windings to form the stator. However, the AFMG machine has two rotors with different pole-pair numbers. Magnetic gear effect can be obtained to increase the torque density. The performance comparisons at no-load and on-load conditions are then studied by 3D-finite element analysis (FEM). Moreover, both machines are prototyped, tested and compared.