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  1. #1
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    Stepper Motor/DC Coil Protection

    Is it a good option to use the following circuit for coil protection

    Click image for larger version. 

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    I intend to use it on all the lines.

    These are TVS with 25V Voperating, 27V-Vbreak, 40V Vclamp


    I never had problem even without these but wish to add some protection (Considering ESD, Surge). Should I even use them as the motor is run by a motor driver whose datasheet suggests its 2KV ESD protected.


    Click image for larger version. 

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    Re: Stepper Motor/DC Coil Protection

    Hi,

    Whether the circuit is good or not depends on
    * the conection of the other motor pins
    * the internal motor wiring (center taped)
    * the driver connetion
    * the driver type (IC, bjt, Mosfet...)
    The shown circuit is useless, because incomplete.

    ESD protection:
    ESD means static charge / discharge. It has nothing to do with EMF of an inductor or motor.
    The energy stored in an inductor may be much more than one may expect of an ES pulse.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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  3. #3
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    Re: Stepper Motor/DC Coil Protection

    TVS diodes offer to switch clamp with attenuation of V=LdI/dt when there is deadtime OFF commutation of NFET,PFET

    and ESD attenuation from 2kV 100pF for impedance ratio of diode to source Rs from ionizing surface ESD when conducting from finger model (HBM) human body model is actually finger model. 100pF
    A best design is easily achieved with good test specs™
    A better question deserves a better answer. ™
    ... so include all your acceptance criteria ( values, % tolerance) and assumptions in your question or any design.

    ... Tony Stewart EE since 1975
    - slightly north of Toronto



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  4. #4
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    Re: Stepper Motor/DC Coil Protection

    I've never heard of a motor damaged by ESD.



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