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Patent Searching and Data


Title:
METHOD FOR ESTIMATING AND METHOD FOR REGULATING CURRENT OFFSET IN AC MOTOR
Document Type and Number:
Japanese Patent JP2001169578
Kind Code:
A
Abstract:

To provide a method for estimating and regulating the current offset in an AC motor for reducing a torque ripple by reducing an offset error.

The method for regulating the current offset in the AC motor comprises the steps of integrating a current command value of the multiplied value of a torque command in constant speed control, by a value corresponding to an electric angle by an integrator 10 at each sampling period of a plurality of periods at the electric angel under the control of the AC motor; estimating the offset of a current detecting system with the value obtained by dividing by sampling times (n) by a divider 11 as an offset value; and subtracting the estimated offset value from the current detected value by a subtracter 13 or adding it to the current command value by an adder, thereby regulating the current offset.


Inventors:
OBA SHUSUKE
TAKEUCHI TOSHIFUMI
Application Number:
JP34651199A
Publication Date:
June 22, 2001
Filing Date:
December 06, 1999
Export Citation:
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Assignee:
YASKAWA ELECTRIC CORP
International Classes:
H02P23/00; H02P21/05; H02P21/14; H02P21/18; H02P21/22; H02P21/24; H02P23/04; H02P23/14; H02P23/16; H02P29/00; (IPC1-7): H02P5/00
Attorney, Agent or Firm:
萩野 平 (外4名)