| 摘要 |
<P>PROBLEM TO BE SOLVED: To estimate an accurate rotational position by supplying a sine wave current even to a permanent magnet motor containing harmonic components in the induced voltage. <P>SOLUTION: An induction voltage generating means 24 is storing induction voltage data concerning to the induction voltage of a motor 2 and generates induction voltages Ed and Eq based on the induction voltage data, an angular frequency ω and a rotational position θ. An output voltage determining means 27 generates output voltages Vd and Vq by adding voltages Xd and Xq obtained by proportionally integrating the induction voltages Ed and Eq and current differences ΔId and ΔIq. An induction voltage estimating means 28 operates induction voltage errors ΔEds and ΔEqs based on a motor constant, currents Id and Iq, the output voltages Vd and Vq, and the angular frequency ω, and an angular frequency determining means 29 determines the angular frequency ωfrom the induction voltage errors ΔEds and ΔEqs. <P>COPYRIGHT: (C)2003,JPO |
