Stepping motor driver using vector control

摘要

The stepping motor driver comprises current sensors that detect winding current values, an angle detection means that detects a rotational angle of a rotor, a first coordinate transformation means that transforms winding current values into winding current values in a rotational coordinate system, an angle calculation means that calculates a command angle value, a third coordinate transformation means that transforms command current values into command current values in the rotational coordinate system according to the difference between the command angle value and the rotor angle value, a current control means that generates current control signals in the rotational coordinate system based on the differences between the command current values in the rotational coordinate system and the winding current values in the rotational coordinate system, a second coordinate transformation means that transforms the current control signals in the rotational coordinate system into current control signals in a fixed coordinate system, and a current supply means that supplies currents to windings of the stepping motor.