| 摘要 |
PURPOSE:To calculate a correct magnetic flux irrespective of the magnitudes of a speed and a load by associating a regulator with a regulator at light and heavy load times in a high speed range, and performing a correcting operation with a value of a memory circuit under the conditions except it. CONSTITUTION:Conversion signals CH, CH1, CH2 becomes L in a low speed range, switches 54, 55, 64, 65 are disposed at the positions designated by solid lines, and the secondary time constant 1/T1 and a magnetizing current correction amount DELTAiM are output by the values stored by the capacitors 59, 69 of sample-holding circuits SH, SH1. A regulator 52 is operated at a high speed and light load time, the switches 64, 65 are closed, and a regulator 52 newly applies a magnetizing current correcting amount DELTAiM so that a magnetic flux set value PHI* and the actual magnetic flux value PHI coincide. The switches 54, 55, 64, 65 are opened at high speed middle load time, and output stored values. The switches 64, 65 are closed at high speed heavy load time, and the regulator 52 applies the secondary time constant 1/T2 corrected so that the set value PHI* and the actual value PHI coincide. |
