Stepper Motor Driver Control
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2005-Feb-15
Fig. 1 shows a circuit to provide a mini-stepping type control of a motor, in addition to full stepping at high velocity rates of movement, with high rates of acceleration and with high rates of deceleration. The rates of acceleration, deceleration and velocity are determined by the rate of sequencing (frequency) and by the current/torque levels. In Fig. 1, DAC 1 and DAC 2 are summed and resolved by a high-slew differential amplifier (A). Resistors R1, R2 and R3 are selected to provide a desired scaling between DAC 1 and DAC 2. An invert device (A1) provides proper voltage phase adjustment to a high-slew differential amplifier (B). DAC 3 is connected to another high-slew differential amplifier (C), for which resistors R4 and R5 perform the desired scaling.