Method for Reducing Acoustic Noise in a Stepper Motor System
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
A method is described in which the audible noise caused by driving a load with a stepper motor at low step rates is significantly reduced by controlling the current rise using discrete intermediate increments. Stepper motor systems have been known to generate audible vibrations, and, for some applications, this noise can be quite annoying. An example where this is true is where the print technology is very quiet, so that any noises generated by electromechanical components in the printer are very apparent, even to the casual observer. In many printers, the escapement system is open loop and employs a P.M. stepper which direct drives a belt that in turn drives the carrier back and forth across the page to position characters in their respective positions.