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CCS/C2000WARE: About the over-modulation algorithm of motor control

user5006419
Expert 1795 points
Part Number: C2000WARE


Tool/software: Code Composer Studio

About the over-modulation algorithm of motor control: when testing 300V motor, running makes gmotorvars.vs close to 0.57 and USER_MAX_VS_MAG_PU set to 0.6666.

The test voltage was suddenly set to 250V, and the measured gmotorvars.vs stopped after reaching 0.6666.

Why do I test in a small motor only to maintain a speed drop over the modulation limit point?If so, how?

  • 0
    TI__Guru** 116090 points
    1. You must apply the current reconstruction algorithm if the USER_MAX_VS_MAG_PU is set to higher than 0.5.
    2. You must be aware of the current sensing circuit since the current reconstruction is very sensitive to its feedback signal, especially the USER_MAX_VS_MAG_PU is higher than 0.57.
    3. You might refer to lab10a, and please post some current waveform to show the met issue if you have further question, that may help us to understand your question and solve it.
  • 0 in reply to Yanming Luo
    TI__Guru** 116090 points

    It's been two weeks since we heard from you, so I am assuming you no longer need clarification for your question that will be marking this thread as closed. You can reply with a post or create a new thread if you have any further question on this topic. Thanks.