| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric-motor control device that calculates an offset value so as to prevent an error from occurring by compensating effects due to hysteresis characteristics when compensating an offset value of a detection current value output from a current detector and ensures high accuracy based on the true detection current. <P>SOLUTION: An offset compensation part 17 is provided with a storage means that defines a full range of compensation detection current values Iu', Iw' detected during operation of an inverter 3 by dividing the full range into a plurality of ranges and has a storage region corresponding to each of the divided ranges. Whenever operation of the inverter 3 is stopped, any one of the respective divided ranges is selected on the basis of the magnitude of a maximum amplitude value and the polarity before a stop of the inverter 3. Detection current values Iu, Iw after a stop of the inverter 3 are stored in the storage region related to the selected divided range. An average value of the detection current values Iu, Iw in all of the storage regions storing the detection current values Iu, Iw is calculated as an offset value. <P>COPYRIGHT: (C)2010,JPO&INPIT |
