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TMDSHVMTRINSPIN: Maximum RPM with FOC supported

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Replies: 3

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Part Number: TMDSHVMTRINSPIN

Team,

I have two questions:

  1. Will the TMDSHVMTRINSPIN kit support driving a motor at 80K rpm with FOC? If the kit does not support this will one of the supported devices (TMDSCNCD28027FTMDSCNCD28069MISOTMDSCNCD28054MISO or TMDSCNCD280049C) be capable of this?
  2. The GUIs just provide a binary fault indicator. Can fault codes be traced back in the source code to figure out a cause, assuming that the FOC source code is provided?

Thanks.

Chris Lande
  • 1. You should know the pole pairs and convert the mechanical speed to electrical frequency. If assuming the pole pairs is 1, the electric frequency of the motor should be 1333Hz that needs to use a higher PWM frequency, at least 25kHz. All the controllers you mentioned above should be ok, but the high voltage kit TMDSHVMTRINSPIN can't support such high PWM frequency. There are no released high voltage kits that can be used for this application till now.

    2. No detailed fault states in both GUIs and source code, just shows there is a fault as well.

  • In reply to Yanming Luo:

    Thanks for the initial information. I have some additional questions.

    1. The motor I'm looking at has 2 pole pairs so that makes f=2.667kHz and therefore bumps up the PWM to 50kHz as well, right?
    2. What is the limitation on the HV kit for going to higher frequency?
    3. Is it the drive stage switching speed? What are the options, if any, to upgrade the kit to support these frequencies?
    4. Without any helpful fault indicators, what other debug options are there?

    Thanks.

    Chris Lande
  • In reply to Chris Lande:

    1. That depends on the performance requirement on the current ripple and speed stability, the higher switching frequency will have a lower current ripple. Maybe, at least 30kHz switching frequency is good for this motor, but 15kHz~20Khz can be used for this motor also.

    2. 20Khz is the maximum switching frequency for the HV kit limited to the power IGBT module, 

    3. No, most high voltage motors don't need so high switching frequency, especially a high power motor since the switching loss is a key factor in the inverter. Customer will design their own hardware board using the high switching frequency MOSFET/IGBT if they want to drive the high-frequency motor. 

    4. Use the CCS to run or debug the project.

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