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Thread: Experience with SiC in motor drives

  1. #1
    Beginner Beginner powergeek is on a distinguished road
    Join Date
    Aug 2019

    Experience with SiC in motor drives

    Hi guys I would like to know if anyone has any experience with SiC in motor drives. If so, could you share the pro's and the con's?

  2. #2

    Infineon Employee
    Infineon Employee
    Infineon Employee
    Infineon Employee
    electricuwe is on a distinguished road
    Join Date
    Sep 2019
    When considering the use of SiC in drives, you have a clear target in mind.

    Usually an increase of switching frequency (compared to today's drives using IGBTs) will not provide a benefit. Motor current harmonics and related losses are already at a quite low level. On the other hand you will not be able to utilize a higher switching speed, as motor windings and bearing imply a limit on dV/dt.

    Hence, when converting a drive from IGBT to SiC-Mosfet, switching frequency and dV/dt should be considered as not subjected to change. However, even at same dV/dt there will be a saving in switching loss (e.g. no tail current, no reverse recovery loss) and with sufficient active area there will also be a saving on forward losses. Utilizing this will lead to a benefit on system level, e.g. enabling a design with natural cooling and high ingress protection or enabling motor integration.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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