Title:
CURRENT CONTROLLER
Document Type and Number:
Japanese Patent JP3505424
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To extend a total current band and realize the improvement of response characteristics, such as the widening of a current loop band, etc., by improvement in compensation effect.
SOLUTION: A transmission function from a voltage command signal u(k) to current output y(k) of a motor is approximated to be Kpwm/(Ls+R) which is subjected to discrete value transformation. When a control object N(z) is defined by N(z)=b/(z+a) (wherein z denotes a leading operator). Assuming that external disturbance(d) including an approximation error component is applied to the system, the voltage command signal u(k) is subjected to nominalization-compensation by obtaining a new voltage command u(k)=u(k)-d(k) wherein d(k) denotes a value estimated by an external disturbance observer comprising a suitable IIR filter Q(z) and is defined as d(k)=Q(z)N(z)-1y(k)-Q(z)u(k). Feedback compensation is applied to the system to obtain Gb/(z+a+Gb). A feed forward compensator expressed as (z+a+Gb)/(Gbz) is inserted into a current command unit to have the current response characteristics of a whole current control unit z-1.
More Like This:
Inventors:
Akihiro Ito
Application Number:
JP6747599A
Publication Date:
March 08, 2004
Filing Date:
March 12, 1999
Export Citation:
Assignee:
Sankyo Seiki Co., Ltd.
International Classes:
G05B11/32; G05B13/02; H02P6/06; H02P6/08; H02P6/28; H02P21/00; H02P21/14; H02P21/22; H02P23/12; H02P23/14; H02P25/022; H02P27/04; H02P27/08; H02P29/00; H02P29/40; (IPC1-7): H02P5/00; G05B11/32; G05B13/02; H02P6/08
Domestic Patent References:
| JP44782A | ||||
| JP5207767A | ||||
| JP6335279A | ||||
| JP10150789A | ||||
| JP10231100A | ||||
| JP635506A |
Attorney, Agent or Firm:
Kazumi Murase
Previous Patent: JPH03505423
Next Patent: PHOTOELECTRIC TRANSDUCER AND PHOTOSENSITIZING PIGMENT FOR TRANSDUCER
Next Patent: PHOTOELECTRIC TRANSDUCER AND PHOTOSENSITIZING PIGMENT FOR TRANSDUCER