| 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 coordinates 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>based on the load angle θ<SB>L</SB>is generated. At the same time, 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 obtaining a this time value θ<SB>C</SB>(n) of the control angle θ<SB>C</SB>. An instructed current value increase decision unit 27 generates a correcting value for the γ axis indicated current value I<SB>γ</SB><SP>*</SP>in accordance with the detected steering torque T, the indicated steering torque T<SP>*</SP>and the operation state of a limiter 24. An indicated current value correcting section 37 temporarily corrects so as to increase the γ-axis current I<SB>γ</SB><SP>*</SP>by the corrected value. <P>COPYRIGHT: (C)2010,JPO&INPIT |
