| 摘要 |
The present invention relate to a method for driving a motor of a motor-driven power steering, the method comprising the steps of: generating, by an inverter driving unit, a two-phase driving command by projecting a Q-axis command onto a two-phase driving axis, when an error occurs in any one of three phases; converting, by the inverter driving unit, coordinates of the two-phase driving command into an actual driving axis; calculating, by the inverter driving unit, a two-phase driving voltage by performing proportional integral control on the two-phase driving command of which the coordinates are converted into the actual driving axis; and driving, by the inverter driving unit, a motor by applying the two-phase driving voltage to an inverter unit. In accordance with the present invention, although an error occurs in any one phase in the inverter circuit of the motor-driven power steering, a predetermined level of assist power is maintained by the other two phases. Therefore, it is possible to prevent a driver from suddenly feeling a different steering feeling and secure the driving safety of the vehicle. [Reference numerals] (AA) Start;(BB) End;(S10) Does an error occur in any one of three phases?;(S20) Generate a two-phase driving command by projecting a Q-axis command onto a two-phase driving axis;(S30) Convert coordinates into an actual driving axis;(S40) Calculate a two-phase driving voltage by performing proportional integral control;(S50) PWM signal covnersion;(S60) Apply the PWM signal to an inverter unit |
