The electric power steering system using the motor and electric power steering it

With reduced torque pulsations can generate large torque, it is to obtain an electric power steering system using excellent motor and it for power steering to both the reduction and high torque generation of torque pulsation. The stator (110) includes a stator core (112), and a stator core multi-phase stator coils incorporated in (112) (114). Core stator core (112), which has been formed by combining a plurality of core pieces divided, a plurality of core pieces divided is obtained by dividing into a plurality of back core portion in the circumferential direction 1 and piece of strip, the core pieces corresponding to the teeth core part comprising a core piece of T-shaped is integral. The stator core (112) is formed by combining a plurality of core pieces T-shaped in the circumferential direction. The stator coils (114) while being accommodated in the slot, in a concentrated winding with respect to teeth core portions.