| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor control device capable of controlling a motor by a new control system not using a rotation angle sensor. <P>SOLUTION: The motor is driven by a γ-axis current I<SB>γ</SB>of a γδ coordinate system as an imaginary rotation coordinate system. The γδ coordinate system is a coordinate system complying to a control angle θ<SB>C</SB>as a rotation angle on control. The difference between the control angle θ<SB>C</SB>and a rotor angle θ<SB>M</SB>is a load angle θ<SB>L</SB>. An assisting torque T<SB>A</SB>corresponding to the load angle θ<SB>L</SB>is generated. At the same time, a steering torque T is fed back, and an adding angle α is generated so that the steering torque T may approximate to an indicated steering torque T<SP>*</SP>. The adding angle α is added to a previous value θ<SB>C</SB>(n-1) of the control angle θ<SB>C</SB>, thereby finding this time value θ<SB>C</SB>(n) of the control angle θ<SB>C</SB>. An initial value setting section 27 sets a plurality of reference control angles, and acquires a detected steering torque T corresponding to each of the reference control angles. An appropriate initial value is set to a control angle computing section 26 based on the detected steering torque T. <P>COPYRIGHT: (C)2010,JPO&INPIT |
