SLVAES8 May   2020 DRV8424 , DRV8424E , DRV8426 , DRV8428 , DRV8428E , DRV8434 , DRV8434E , DRV8434S , DRV8436 , DRV8436E , DRV8889-Q1

1.   How to Reduce Audible Noise in Stepper Motors
   1.     Trademarks
   2. 1 Introduction
   3. 2 Details of the Test Setup
   4. 3 Sources of Noise in a Stepper Motor
      1. 3.1 Magnetic Noise
      2. 3.2 Mechanical Noise
      3. 3.3 Electrical Noise
         1. 3.3.1 Effects of Current Ripple and Decay Mode
         2. 3.3.2 Effects of PWM Chopper Frequency
         3. 3.3.3 Effects of Current Zero-cross Error
         4. 3.3.4 Effects of Step Resolution and Step Frequency
         5. 3.3.5 Effects of Resonant Frequency
   5. 4 Summary
   6. 5 References