| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably control a permanent magnet synchronous motor without the use of position detectors and AC current detectors. <P>SOLUTION: In performing a control using an inverter 11 by making a direct proportional relationship between a voltage and its frequency applied on the winding of a permanent magnet synchronous motor 12, it is so designed as to determine frequency corrections Δf* for establishing the stabilization of the control through a negative-feedback to numeric command values of frequencies f* of applied voltages of the electric motor given to the inverter 11, by the use of a current detector 24, a low path filter 25 and an effective current arithmetic device 26, etc. As a result, the position detectors and AC current detectors that are needed conventionally are eliminated, and the costs will be reduced accordingly. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
