This paper will present detail design of PMa-SynRM double V and Inverter Delta in sinusoidal step skewing rotors. Electromagnetic performances of double 2V layer- inverter delta VI layer permanent magnet assistance synchronous machines (PMa-SynRMs) have been implemented for high constant torque in wide range speed in electric vehicle applications. The torque density, torque ripple, and output power are studied with FEA-finite-element analysis in different topologies. Electromagnetic designs of two-layered rotor structure with double 2V and VI are good choices because it is simple structure and easy to manufacture in mass production. With higher torque density and efficiency, the two-layered 2V or VI magnet can adjust sinusoidal step skewing to minimize harmonics torque ripple and back EMF. Finally, the proposal design PMa-SynRM with 2V and V-I layered magnets rotor is implemented to verify their torque and output power in comparison with commercial IPM motor of WOLONG EVs.