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Rotate Speed Sensors

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Max
Max Contributor Level 1
edited June 3 in Module Products

Dear Sir or Madam,

I am happy to startup the Wolfspeed CRD25DA12N-FMC 25 kW Three-Phase Inverter. Currently I am going to try to find out the interfaces for speed sensors. In your user guide you write that it's possible to measuring the mechanical position of a motor or other rotating device through a resolver sensor. Regarding the resolver I have got the following questions:

- What kind of excitation signal is necessary?
- What kind of resolver is necessary and what are the requirements for the resolver?
- Which voltage and frequency is needed?

Another question is, is it also possible to implement an encoder? Where is the interface for the encoder and how is it possible to buildup the encoder? (Connector, Plugin, quadrature, ....)

It would be very well, if you could help us! Thank you in advance.

Best regards,
Max

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  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 5
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    Thank you for your post, it has been approved and we will respond as soon as possible.

    Max
  • ChrisN
    ChrisN Wolfspeed Employee - Contributor Level 3
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    Hello Max,

    Thank you for your question. By default, the resolver excitation signals are optimized for 7 Vrms @ 10 kHz resolvers such as the Tamagawa TS2640N321E64. I attached an LTspice simulation of the resolver excitation signals if you would like to evaluate what parameter values work for your system.

    The design was not developed for encoder applications, so it does not include this functionality by default. However, the spare GPIO pins routed to the extra headers on the PCB might be able to be modified to support encoder functionality. For a reference of how this could be implemented, the CRD07500AA12N-FMC design includes connections for a quadrature encoder.

    CRD25DA12N-FMC - Resolver Circuit.zip

    Thanks,

    Chris N.

  • Max
    Max Contributor Level 1
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    Dear Chris,

    thank you for your support! Is there anybody who had some experiences in integrating an encoder at the Wolfspeed CRD25DA12N-FMC 25 kW Three-Phase Inverter? Thank you for your help!

    Best regards,

    Max

  • ChrisN
    ChrisN Wolfspeed Employee - Contributor Level 3
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    Hello Max,

    Since we do not directly support encoder functionality on this design, we have not used an encoder with it. However, TIDM-02014 by our partner Texas Instruments implements encoder functionality with fully released firmware. That design could be used as a reference for implementing encoder functionality on this inverter.

    Thanks,

    Chris N.

  • Max
    Max Contributor Level 1
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    Hello Chris,

    we have got a resolver with 7 Vrms @ 4 kHz.

    https://www.ltn-servotechnik.com/de/resolver/detail/re-15/

    RE-15-3-D04

    Is it also possible to work with that sensor at the Wolfspeed CRD25DA12N-FMC 25 kW Three-Phase Inverter? How can a resolver be implemented?


    Best regards,

    Max

  • ChrisN
    ChrisN Wolfspeed Employee - Contributor Level 3
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    Hello Max,

    Although we have not tested that exact resolver, it will likely work with this inverter. The provided Wolfspeed firmware does not include resolver feedback by default. However, the resolver firmware of TIDM-02014 by our partner, Texas Instruments, could be adopted to work with this design. Details to connect the resolver to this inverter are provided in Section 2.3.5 of the user guide (repeated below).

    image.png

    Thanks,

    Chris N.

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