| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem of a cell multi-voltage type inverter that since it consists of a single phase inverter, each individual DC voltage is different and thereby the position estimation value of magnetic pole differs from the actual value.SOLUTION: In an output cell determination unit using a CPS control system, the amplitude of pulse voltage and the number of stages of each phase cell unit connected in series from the pulse phase are determined and the DC voltages of respective cell units measured are arranged in the ascending order for each phase, thus setting a group when each phase cell unit of each arrangement order is 1. Furthermore, a group capable of combining two of each phase is set from a group where each phase cell unit is 1. Voltage variation deviation is determined for each group when 1 and 2 thus set are determined, and a minimum deviation group is extracted as the estimation value of magnetic pole position at the time of magnetic pole position estimation.SELECTED DRAWING: Figure 1 |
