| 摘要 |
PURPOSE:To enable to smoothly control the primary current by presuming a magnetic flux position from speed information during period DELTAt sampled at the magnetic flux position and interpolating it. CONSTITUTION:A magnetic flux position interpolating block 36 counts by a counter 34 the pulse of a pulse generator 32 for generating a pulse of the frequency proportional to the digital amount of NFB. The counter 34 is reset by a timing signal 31. A digital adder 35 digitally adds the digital amounts of the counter 34 and a T/phi converter 15. In other words, the block 36 interpolates the magnetic flux position in such a state that the speed is constant during the period DELTAt that new digital amount is outputted from when the digital amount of the converter 15 is outputted, the digital amount of the converter 15 is as base content, and the digital amount of the counter 34 is as offset content. |
