| 摘要 |
PURPOSE:To prevent an apparatus from being affected by saturation of a control system due to limitation of the withstand current and withstand voltage of a variable frequency power converter by correcting a secondary resistance value in a flux vector detection circuit. CONSTITUTION:The constant of an induction motor 1 including a secondary resistor and the primary current and rotational speed of said induction motor 1 are inputted to a flux vector detection circuit 7 so that the amplitude and phase of a secondary magnetic flux vector may be detected. The output of said flux vector detection circuit 7 is inputted to a torque estimation circuit 10 so that a generated torque of the induction motor may be estimated. On the other hand, a real generated torque is detected by a torque detection circuit 9. In a correcting circuit 11, then, a secondary resistance value in the flux vector detection circuit 7 is corrected on the basis of the deviation of a torque estimate from a torque real value. |
