| 摘要 |
There is provided an electric power steering device which, when an abnormality occurs in one phase of a three-phase brushless motor, permits continuous driving of the motor using the remaining two phases without deteriorating the steering feeling. When a power distribution abnormality of a drive system of one phase of respective phase coils has been detected by an abnormality detection section 27, an abnormal-time phase current instruction value for using the remaining two phase coils is calculated based on a steering assist electric current instruction value Iref, and an electric motor 12 is driven based on that abnormal-time phase current instruction value. At that time, when an electrical angle ¸e falls within an acceleration region, the abnormal-time phase current instruction value is increased or decreased for correction, so as for the rotation of the three-phase brushless motor 12 to be accelerated in a steering direction. |
