View Full Version : Stepper Motor OverDriving

10-28-2006, 11:43 AM
Hi, i have got a 3.15V bipolar stepper having a current rating of 1A and 3.15ohms/phase resistance. I've made a L298 driver for the same but the minimum drive voltage that L298 supports is 7.5V. So, is it safe to overdrive the stepper at almost double the voltage?

10-28-2006, 12:50 PM
1. As far as the current is within limits (1A) , it si OK. There is some Voltage drop due to the L298 internal transistor junctions.
2. Usually, PWM drive needs greater voltage than the motor specs for sufficient drive and torque. As far as the motor doesnt stall for a long time.
3. Put in a .1 -0.3 ohm R in series with the supply line to the motor as a precaution. This can be a hand wound length of #22 solder lead.