Stepping motor controller

摘要

The controller comprises current sensors for detecting motor currents, an invertor containing a current control means for feeding currents to motor windings, a co-ordinate transformer that transforms the motor currents in a fixed co-ordinates system into currents in a first rotational co-ordinates system, an angle calculator that transforms a command pulse into a command angle, a second rotational co-ordinates system composed of a dp axis and a qp axis perpendicular to the dp axis being determined from the command angle a command current on the dp axis being set to be a value corresponding to a motor current amplitude, another command current on the qp axis being set to zero, the motor current being projected on the dp and qp axes and controlled so as to make the components on the dp and qp axes coincide with the respective command currents on the dp and qp axis.