Stepper Motor

The connections to the motor are...

Each winding has a DC resistance of about 110 ohms.

• A suitable motor may have 5 or 6 wires. The wires which go to the +12v supply are common in a 5 wire motor.

• The wiring can be worked out for a motor by measuring the resistance with a meter.

• If the motor turns the wrong direction when driven by the IC, the connections can be changed over (between Q1/Q2 and between Q3/Q4)

• With the circuit and motor used in this design, the torque of the motor is 1300 gm-cms. This is much highter than necessary to power the Scotch mount, so smaller motors could also be used.