| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To correct a phase error due to a winding impedance of a synchronous motor without significantly loading an arithmetic device. <P>SOLUTION: A waveform correction section 4 sets correction start timings of a terminal voltage Uc at rise and fall edges of a gate signal G output to semiconductor elements of upper and lower arms of an inverter INV, derives a length of time of correction of the terminal voltage Uc from a winding reactance L of a synchronous motor M, a DC current Idc input into the inverter and a DC voltage Vdc input into the inverter, and derives a period of correction of the terminal voltage Uc from the correction start timings and the length of correction time. A corrected terminal voltage Uc+ resulting from multiplying the terminal voltage Uc of the synchronous motor M by a gain depending on an induced voltage level in the correction period of the terminal voltage Uc is output to an integration circuit 2. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
