Abstract
The hollow cup motor is particularly suitable for small, light and mini UAVs due to
its light weight, small size and low energy consumption. The difference from the
traditional motor is that the motor structure of the hollow cup motor is a rotor without
iron core. This motor structure has significant advantages such as small mass, low
inertia, low loss, long life, and fundamentally eliminates iron consumption. It is
relatively general The mechanical time constant of the iron core motor is more than
100ms. Its mechanical time constant is generally less than 28ms, and some are even less
than 10ms. The response speed can be said to be very good.
In this paper, through the design method of the traditional permanent magnet DC
motor, the existing hollow cup brushed DC motor is referenced in the structure, and a
new design scheme is proposed for the motor structure. Combined with the
development of finite element theory in magnetic field analysis, the shape structure of
the armature winding was explored.
According to the technical requirements, the main structural dimensions are
preliminarily selected from the relationship of the main dimensions. Using the finite
element analysis software ANSYS to simulate and analyze the internal magnetic field of
the motor, the magnetic flux density and magnetic field strength distribution of the
motor armature winding are obtained.
The finite element analysis software ANSYS was used to analyze the influence of
the armature winding shape and structural parameters on the motor magnetic field.
These parameters were analyzed, calculated and optimized with the goal of eliminating
harmonics.
Keywords: Hollow cup motor, finite element, armature winding
