Title:
INVERTER CONTROLLER
Document Type and Number:
Japanese Patent JPH0715972
Kind Code:
A
Abstract:
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.
Inventors:
EBA KOJI
Application Number:
JP15502793A
Publication Date:
January 17, 1995
Filing Date:
June 25, 1993
Export Citation:
Assignee:
OKUMA MACHINERY WORKS LTD
International Classes:
G05F1/10; H02M7/48; H02P27/06; H03H17/00; H03H17/02; (IPC1-7): H02M7/48; G05F1/10; H02P7/63; H03H17/02
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)