| 摘要 |
PROBLEM TO BE SOLVED: To make a high-quality control of an induction machine available by outputting secondary magnetic flux with the inputs of induction machine voltage and current, a primary resistance, a primary and a secondary self- inductance, and a mutual inductance and outputting a secondary time constant with the inputs of the secondary magnetic flux, the induction machine current, and the mutual inductance. SOLUTION: A magnetic flux calculator 9 outputs secondary magnetic flux Ψ2 with the inputs of the induction machine voltage (v) and current (i) and a preliminarily given primary resistance R1, primary self-inductance L1, secondary self-inductance L2, and mutual inductance M. A time constant calculator 10 outputs a secondary time constant T2 with the inputs of the secondary magnetic flux Ψ2, the induction machine current (i), and the mutual inductance M. Since DC current is caused to flow in a secondary circuit, measured values of the secondary time constant T2 and secondary resistance R2 are the ones which are close to those at the normal operation of the induction machine. And, a voltage detector 3 detects or estimates the voltage V when the induction machine 4 is rotating at nearly a rated rotating speed, and therefore there is only a little error by the voltage detector 3. |
