| 摘要 |
<p>PURPOSE:To control a driving motor for induction motor to generate a sufficient driving torque when a commanded speed value becomes lower by variably controlling the electric current supplied to the driving motor by means of a motor control means based on a vector control system using a torque component and magnetic flux component. CONSTITUTION:A motor control section 22 is constituted in such a way that the section 22 separates a current component (field current) for generating a field and another current component (torque current) for generating a rotational torque perpendicular to the field from the electric current supplied to a driving motor M upon receiving driving speed command information supplied from a main controller 21 and preset magnetic flux command information from a drive instructing section 23, synthesizes the vectors of the current components by separately controlling the current components, and supplies the synthesized vector to the driving motor M. Therefore, the motor control section 22 can excellently respond to speed commands and, at the same time, can make the motor M to exert a prescribed driving torque even in a starting state where the speed of the motor M becomes lower.</p> |
