US 11,990,858 B2
Method and circuit assembly for the resonance damping of stepper motors
Bernhard Dwersteg, Rellingen (DE)
Assigned to MAXIM INTEGRATED PRODUCTS, INC., San Jose, CA (US)
Filed by Maxim Integrated Products, Inc., San Jose, CA (US)
Filed on Sep. 5, 2022, as Appl. No. 17/903,025.
Application 17/903,025 is a continuation of application No. 16/632,360, granted, now 11,437,943, previously published as PCT/DE2018/100718, filed on Aug. 16, 2018.
Claims priority of application No. 102017118837.1 (DE), filed on Aug. 17, 2017.
Prior Publication US 2022/0416699 A1, Dec. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02P 8/00 (2006.01); H02P 8/32 (2006.01)
CPC H02P 8/32 (2013.01) 14 Claims
OG exemplary drawing
 
1. A method for damping stepper motor resonances, the method comprising:
coupling semiconductor switches of a bridge circuit with a plurality of motor coils;
applying a voltage from a voltage source to the plurality of motor coils, the voltage having predefined current values and a predefined polarity, by correspondingly opening and closing the semiconductor switches; and
activating a passive fast-decay phase (FD-phase) at stepper motor speeds in a zero crossing or in a time range surrounding the zero crossing of a predefined target coil current for each motor coil within the plurality of motor coils, the passive FD-phase causes a coil current to flow from a first motor coil within the plurality of motor coils back into the voltage source by diodes electrically coupled with the semiconductor switches in the reverse direction between the positive supply voltage and ground potential.