Title:
OFFSET AUTOMATIC CONTROL DEVICE FOR CURRENT DETECTOR
Document Type and Number:
Japanese Patent JP3217145
Kind Code:
B2
Abstract:
PURPOSE: To prevent the pulsation of the torque generated in a servo motor by automatically executing the correction of an offset correction value even during the operation of the motor.
CONSTITUTION: When an error is generated in offset correction by a temp. change during operation, the pulsation of the torque generated in a motor is detected from a torque command value (b) by an electric angle detection means 26 to detect a first electric angle wherein the torque command value (b) becomes max. by a pulsation component and a second electric angle wherein said value (b) becomes min. on the basis of the electric angle signal (f) of the motor. Further, in a judging means 27, it is judged whether an offset correction error is generated on the basis of the angle difference between the first and second electric angles and, if it is judged that the offset correction error is generated, the addn. of the offset correction value control quantity corresponding to the value of the first electric angle is performed in a correction means 30 to renew offset correction values c1, c2.
Inventors:
Masahiro Ooto
Hisashi Kinoshita
Suspense
Yoshihiro Ino
Hisashi Kinoshita
Suspense
Yoshihiro Ino
Application Number:
JP23751892A
Publication Date:
October 09, 2001
Filing Date:
September 07, 1992
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01R19/00; H02P21/05; H02P21/22; H02P23/00; H02P23/04; H02P23/16; H02P29/00; (IPC1-7): H02P5/00; G01R19/00; H02P7/36
Attorney, Agent or Firm:
Yoshihiro Morimoto