| 摘要 |
PURPOSE:To reduce the ripple torque of a motor by eliminating circuit components causing gain error and offset during measurements of output current in an inverter controller. CONSTITUTION:A sigma delta converter 30 for converting the potential difference of a current detection resistor 16 to a Sigma-Delta-modulated digital signal, a photocoupler 25 for transferring the digital signal after electrically insulating it, and a digital filter 32 for demodulating the digital signal after transfer. |
