| 摘要 |
<p>PURPOSE:To measure electric motor constant accurately while the rotation of the electric motor is at halt. CONSTITUTION:When a primary angle frequency command w1* and a primary voltage command V1q* are set to 0 by an electric motor constant operation machine 7 and an AC signal is input to a coordinate converter 3 as the command value of axis (d) and is converted to a three-phase voltage command signal, a signal for flowing a single-phase AC current is output from an inverter 2 to an AC electric motor 1. thus enabling current flowing through the electric motor 1 to be detected by current detectors 4a and 4b, the current component 11d of the axis (d) obtained from a coordinate converter 5 to be analyzed after it is subjected to Fourier expansion with an AC signal as a reference, and hence obtaining the Fourier coefficient of the fundamental wave component. It is performed by two frequencies and then electric motor constant is calculated from the relationship among the Fourier coefficient, Fourier coefficient obtained from the frequency characteristics of output current/input voltage of an electric motor model, and a corresponding current component value.</p> |
