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CCS/TIDM-1003: Issue identifying and running high voltage three-phase BLDC

Prodigy 205 points

Replies: 3

Views: 85

Part Number: TIDM-1003

Tool/software: Code Composer Studio

Hi there,

I designed my custom board based on TIDM-1003 to drive 300V, 1200RPM, 4kW/18A three-phase BLDC motor.

First I checked my design, driving 300V, 600RPM, 5A three-phase BLDC motor. It was successful and the firmware successfully identified the motor. then I checked the ID-run's parameters to run my motor and I could properly control my motor, using Univeral-GUI.

Then I decided to check my design for 300V, 1200RPM, 4kW/18A three-phase BLDC motor, but whenever I tried running motor I faced this error:

I unplugged and re-checked it several times, but finally, the IPM and shunt-resistor were damaged! :((

Do you have any idea of the cause and the solution?

  • You might use CCS to debug the project directly, and please note that the ground planes of both the power domains are the same, hence proper isolation requirements must be met before connecting any test equipment or emulation with the board.
  • In reply to Yanming Luo:

    Dear Luo,

    Thanks for your prompt reply.

    I already debugged the project using CCS directly and I faced with the same error. :(

    My JTAG emulator is isolated (XDS100v2 is ISO-USB-to-JTAG).

    For MCU and power section, you're right! But please consider that I checked the board with another 300V BLDC motor and it worked well. TIDM-1003 has not isolated grounds too.

    Could you please describe more and possibly show me a technical guide for the isolation principals?

  • In reply to Yanming Luo:

    In addition, I want to ask you about isolation:

    1. Which of them is more critical? to isolate the voltage/current sensing circuit's ground or MCU's?

    2. how can I effectively isolate them? does Kelvin GND help me or I should try isolation ICs?

    3. Is there any reference design which shows isolating circuits and hardware considerations?

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