ELECTROMAGNETIC INVESTIGATION OF EXTERIOR ROTOR V-SHAPE PERMANENT MAGNET MOTORS FOR E-SCHOOTERS BY A FINITE ELEMENT TECHNIQUE

Abstract

In this paper, an exterior rotor V shape permanent magnet motor of 2kW is
investigated to improve the constant torque and power in a wide speed in
comparison with the conventional BLDC motor. This outer rotor of permanent
magnet V shape motor of 2kW is potentially applied for E-scooters of the VinFast
Group - Vietnam with the speed of 90km/h. Several topologies of stator
slots/permanent magnet poles are proposed to obtain the maximum motor
power, torque and efficiency. The main advantages of V shape permanent outer
rotor are produced with the high number of rotor pole such as Z36/p32 and
Z48P40 to keep a small back electromagnetid force still at the high speed. In this
paper, an auto design program is presented to find out permanent magnetic
parameters and winding size though many calculation loops. The magnetic flux
density, eletromagnetic torque and torque ripple can be also estimated by
Matlab coupling to a finite element method.