公开(公告)号：US20190256128A1

公开(公告)日：2019-08-22

申请号：US16312723

申请日：2017-07-07

Applicant: NSK LTD.

Inventor： Hiroaki TAKASE ,  Ryo MINAKI ,  Hideki SAWADA ,  Takayoshi SUGAWARA

IPC: B62D5/04 ,  H02P6/08 ,  H02P27/08

Abstract: An electric power steering apparatus of a vector control system converts calculated dq-axes current command values into 3-phase duty command values, driving-controls a 3-phase brushless motor by an inverter of a PWM control, and applies an assist torque to a steering system of a vehicle, wherein compensation signs of 3-phase current model command values in which the dq-axes current command values are converted into a 3-phase current command value model are estimated, wherein a dead time compensation amount is calculated based on an inverter-applying voltage, and wherein dead time compensation is performed by adding dead time compensation values that are 2-phase values converted from 3-phase values in which the compensation signs are multiplied with the dead time compensation amount, to dq-axes voltage command values, or by adding 3-phase dead time compensation values to 3-phase voltage command values.