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TMDSCNCD28069: TI controlCARD for Resolver Feedback based PMSM motor

Sri Nikola
Prodigy 225 points

Part Number: TMDSCNCD28069
Other Parts Discussed in Thread: PGA411-Q1

Hi,

I looked at InstaSPIN FOC motor control using F28069 and a DSP hardware. This sensorless FOC is very cool and cost saving.

However, I already have a PMSM motor with resolver feedback integrated to it. (21BRX700-D42AA Dynapar Resolver).

I am wondering which 100 pin controlCARD I can use for the motor with sensored FOC using resolver feedback? This is for an automotive traction application.

Thanks,

Sri  

  • 0
    TI__Guru** 116920 points
    Yes, it can be used for sensored FOC with resolver, but you need to add a RDC device for resolver sensor, like PGA411Q1 which can be connected to MCU with SPI or Parallel GPIOs. And then you can use the position and speed information from PGA411 to replace them from FAST estimator for motor control.
  • 0 in reply to Yanming Luo
    Prodigy 225 points

    Thank you for the information!

  • 0 in reply to Yanming Luo
    Prodigy 225 points
    Hello Yanming, I am using this below dsp board. Does the PGA411 still require an evaluation board to connect to this?
    powersimtech.com/.../DSP-Development-Board-User-Manual.pdf
  • 0 in reply to Sri Nikola
    TI__Guru** 116920 points
    You have to add the interface and supporting code for controlling the PGA411 to get the position and speed information. This kit and controlCard can't be connect to PGA411 directly.
    You can use SPI and some GPIOs to communicate and control the PGA411, there is a reference designs in TI website to show how to do this. You can download and refer it.
  • 0 in reply to Yanming Luo
    Prodigy 225 points
    Hello Yanming,

    I tried to find this information but I couldn't. Can you tell me if the encoder output from PGA411-Q1 chip is 3.3 V or 5 V ?

    Also, I know that with incremental encoder you always have to make sure the position is at the reference when you start the control. But, here if I am converting a resolver interface into encoder outputs, do I still have to worry about this?

    Thanks,
  • 0 in reply to Sri Nikola
    TI__Guru** 116920 points
    1. Per PGA411 datasheet, the output level is based on VIO (I/O supply input) which can be connected to 3.3 or 5V.
    2. You have to do this since the QEP output signal from PGA411 is incremental mode, otherwise you may need to read the output of resolver via SPI or parallel interface.
  • 0 in reply to Yanming Luo
    Prodigy 225 points
    the PGA411 has two output excitation voltages : 4 V rms and 7 V rms. But the resolver sensor I am using has reference value 8 V rms and 8 kHz frequency. I tried exciting the resolver with 4 V rms and measured the input signals to Izx pins. Is there any downside of operating it at 4 V rms or 7 V rms rather than 8 V rms and 10 kHz frequency?
  • 0 in reply to Sri Nikola
    TI__Guru** 116920 points
    You can set the output excitation voltages to 7 V rms in your application, and you may post your question to our Analog E2E as below forum to get more clearly answer. And you may search the question in E2E forum and there may be additional individuals who have had first-hand experience with this issue in the past.
    e2e.ti.com/.../73

    Btw, I have also assigned your question to our PGA411 expert.
  • 0 in reply to Yanming Luo
    Prodigy 225 points
    Hello Yanming,

    I am working on making this board as I have got it all figured out. However, I have two questions for you:

    1.) Do you think would there be any latency issues if I use SPI for both chip settings and also for getting values on angle and velocity?

    2.) If I am using parallel interface, it seems like I need 18 digital pins for this chip after using switch (0 or 1) for some other digital pins.
    However, for the DSP logic board I am using (mentioned in the first post)..it only has GPIO (20) pins available through connectors J10 and J11. Can some of these pins be used as timers..like Inhibit function, VA1 and VA0 switching back and forth..and for ORDCLK?
  • 0 in reply to Sri Nikola
    TI__Guru** 116920 points

    Q1: Yes, you may use different CS pins for the DRV and PGA411 devices.

    Q2: Yes, you can. And I also assigned the question to our PGA411's expert for double confirm and give you more suggestion.

    Please you may also post your PGA411 questions to below forum to get more application support.

    e2e.ti.com/.../73