This paper describes different types of stepper motors and their operating principles. Then, the disadvantages and application areas of stepper motors are listed as a conclusion to the theoretical part. Then, the relationship between the voltage at the output of the rectifier of the speed measuring element and the actual speed of the motor is experimentally determined. Thanks to the relationship between the frequencies of the fundamental harmonic and the pulsations, a passive RC filter is constructed to reduce these pulsations to an acceptable level. For 3 different filters, their disadvantages and advantages are given and described.