| 摘要 |
<P>PROBLEM TO BE SOLVED: To use a simple structure to realize a compensation function provided in a control system for stabilization of an entire control system. <P>SOLUTION: In a structure in which a target assist torque calculation unit 20 calculate target assist torque (a target current) and a current control unit 120 calculates a basic instruction which is a current instruction so that an actual current Im flowing in an electric motor 6 becomes equal to the target current, a phase compensator is not provided to the target assist torque calculation unit 20 unlike a conventional structure having the target assist torque calculation unit 20 with a phase compensator, and a stable current compensation unit 31 is added onto a current control unit 120 instead. A transfer function of the stable current compensation unit 31 is expressed by a function of not more than fourth order terms of s (differential operator) and generates a compensation instruction on the basis of the actual current Im in order to produce stable operation of the entire control system. Then, a current instruction having a basic instruction compensated by the compensation instruction is input to a drive circuit 130. <P>COPYRIGHT: (C)2013,JPO&INPIT |
