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This paper presents a design method for a small-sized slotless brushless dc motor. Distributed hexagonal windings are employed for achieving a high torque density and for ease of manufacture. Numerical approaches with an analytic model are used to analyze the magnetic and output characteristics of the motor. The proposed motor is manufactured, and the(More)
This paper presents the development results for slotless type brushless DC motors and planetary gear heads for service and special purpose robot applications. The designed slotless BLDC motor has a hexagonal winding shape, and the developed motor sizes are 22, 32, and 40mm with the outer diameters. The developed gear heads are planetary type, and the gears(More)
An analytical model for slotless brushless DC motors having four poles and twelve single coils is presented. To determine a back EMF constant of motor with hexagonal windings, winding forming factor taking into account winding shapes is introduced. The calculated results are verified with FE analysis and manufacturing through an example model, and(More)
This study presents a brushless DC (BLDC) motor for air management system of fuel cell modules. Magnetic equivalent circuit model and finite element analysis are used to design the motor, and an improved structure is considered to reduce a mechanical loss induced from bearing units. Finally, air blower system combined with the motor and an impeller is(More)
This paper presents spindle motor with fluid dynamic bearing (FDB) for hard disk drives. Thrust bearing of FDB requires appropriate pressure to operate in smooth rotations. In this study, the thrust force between rotor and thrust yoke is analyzed using 3D finite element method and experimental results are compared with the simulated one
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