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

3 Sources of Noise in a Stepper Motor

The amount of audible noise from a stepper motor depends on the type of motor and the operating conditions. Stepper motor noise has been described as a high-pitched whine, a hissing noise or even a deflating tire. Human audible frequency range is generally considered as 20 Hz to 20 kHz, but the human ear is most sensitive to frequencies between 2 kHz and 15 kHz. Permanent magnet and hybrid stepper motors are generally quieter, whereas variable reluctance stepper motors are the noisiest.

The sources of noise coming out of a stepper motor can be broken into three main categories: magnetic, mechanical, and electrical.