![]() ![]() So that kinda explains the functions of the chip. This technique is known as "chopper drive" and it allows the motor to increase its top speed.' When it falls back down, the power is reapplied. To avoid destroying the motors, the current through the windings is monitored and power is cut off when the current reaches a critical level. A designer might use 5 volt steppers and then run them at 12 or 14 volts. 'To increase the torque at higher speeds, stepper motors are driven at several times their voltage rating. It's a nice and easy going explanation on stepper motors in general and it includes this bit on chopper control of steppers. ? what does that mean? well, i found this page. It includes two PWM chopper circuits to regulate the current in the motor windings. Direction is decided by taking a pin HIGH or LOW. The motor takes one step for each pulse sent from the arduino board. In all cases, you can digitally select full stepping, half stepping and wave stepping modes. The l297 can create the control signals for bipolar, unipolar and variable reluctance stepper motors. ![]()
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