AnsweredAssumed Answered

Winding noise during hold

Question asked by post.pete on Oct 25, 2013
Latest reply on May 29, 2014 by gagliarducci.fabrizi

With L6472 I hear audible (high pitch) noise from motor when holding.
volume of noise increase with increase hold current. It d
oes not matter if the motor is loaded or not.


When I look at winding with scope one pair is the typical pwm signal locked and duty cycle appropriate for the hold setpoint

The other pair of windings appear ‘unlocked’ and much higher in frequency than the other winding.


EVAL Bd hardware
24v supply, current set point .35amp
Nema17, 18mh / 8.9ohms, 0.9degree step angle


Is there a setting I am overlooking


This does not occur with L6470.
thanks for your support !