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Surge suppression idea

Eavesdropper
Is it possible to use a Ferrite Bead as a surge suppressor for servos, steppers, other motors? Ferrite beads are good for high frequency suppression, so how big would one have to be for low frequencies? This question is inspired off of what a friend of mine has suggested.
 
 
E
  • 0
    E,
     
    What is the source of the signal you want to suppress? If it comes from your servos, steppers, or other motors, you can easily make measurements. If you want to protect your servos, steppers, or other motors for unknown surge voltages, you never know when the surge will attack and what shape is has.
     
    With an inductor (like a ferrite bead) you can slow down the rate of rise of surge voltages and currents.
    This way a narrow transient will reach a lower peak voltage behind the inductor.
    A combination of an inductor resistor and capacitor can be used to suppress known surge voltages.
     
    To protect against unknown surges only varistors, sparc gaps and zenerdiodes can be used.
    Inductors can help to slow down the rate of rise of surge voltages and currents.
    This might give you time to blow a fuse before the surge voltage has reached a value that will destroy an overvoltage protector like a zenerdiode or a varistor.
  • 0

    Since the frequency of the transients generally originated from the motors are very less the effective impedance offered by the beads would be very less.So it would not be effective in reducing the transient current.So it is not an effective solution.

     

    As mentioned in the previous blog it can be used to control(but the effect is minimal compared to an inductor) the di/dt and dv/dt of the incoming transients.

  • 0 in reply to Former Member

    Hi guys,

    offten are realy good help if you use in both line of the motor rod core chokes and a c-cap with max 1nF. Possible to get them as SMD as well or our WE-PD2 series or WE-PF series. The inductance should be few microH (max.10uH). I would not suggest to use WE-CBF( chip bead ferrite) because of the high transients should be a wire used inductor not multilayer. You also could try to use a CMC (common mode choke) if the motor are the antenna , but in that case the CMC should be placed to the control unit thne the cable then the motor.

    Good luck!

    ;-)

    Lorandt