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DRV10983 EVM Damage?

Duncan MacGregor
Intellectual 470 points
Other Parts Discussed in Thread: DRV10983

I had a DRV10983 EVM successfully operating with the supplied Runtian BLDC motor with a 24V supply. I then attempted testing our application motor (BLDC, 1.6A max, 24V) with the EVM but the DRV10983 iimmediately smoked when the 24V supply was connected using the same order of connection as specified in the EVM quick start guide. I don't believe that there were any incorrect connections.

I have replaced the DRV10983 and the EVM is working again with the Runtian motor at 24V. Before I potentially create more damage is there anything different that I should be doing before testing this alternate motor?

Appreciate any inputs.

  • 0
    TI__Guru** 114905 points
    Hi Duncan,

    Our experts have been contacted regarding your post. They should respond soon.
  • 0 in reply to Rick Duncan
    TI__Prodigy 355 points
    Hi Duncan, May i know your motor parameters?
    R, Kt, number of poles, etc. You can refer to the DRV10983 tuning guide for the detail of measurement.
    http://www.ti.com/lit/pdf/slou395
  • 0 in reply to Yisong Lu
    Intellectual 470 points
    The motor details I have determined so far are: Voltage = 24V, Poles = 2 (per TG 2.1.2), Max RPM = 32605, Imax = 1.62A, R(ph-ct) = 0.6 Ohm, Kt 41.83 mV/Hz (per TG 2.3). All values have been from the motor data sheet unless otherwise noted. Thanks for your help.
  • 0 in reply to Duncan MacGregor
    TI__Prodigy 355 points
    0.6 ohm resistor is very small, it can cause big current if the parameter is not set properly.
    Please set the Pot to zero before power on.
    Then set the motor parameters, especially the resistor value. After that turn the pot to spin the motor.
    We suggest to follow the tuning guide step by step to make the motor spin. Iet me know if you see damage again.
  • 0 in reply to Yisong Lu
    Intellectual 470 points
    It sounds like it is important to set the motor parameters first BEFORE connecting the motor. I'm pretty sure that I did have the pot set to zero before I applied the 24V power but I will make sure that is set correctly the next time I run the motor spin test.
  • 0 in reply to Duncan MacGregor
    TI__Expert 8885 points
    Duncan,
    In addition to keeping Pot to zero position in beginning, the next major step is to successful rotation in open loop without damage. To achieve this:
    1. Disable close-loop at Start-up setting.
    2. Set Open loop to close loop threshold to 1/10 of rated speed ~53Hz.For 2-pole motor, 32000rpm corresponds to 533Hz.
    3. Keep align time in order of 0.5sec.
    4. Keep minimum value of first-order/second order accelerates to start with
    All above steps are also provided in tuning guide, I just provided some number for you to start.
    Best RegardsMilan-Motor Application Team
  • 0 in reply to Milan Rajne
    TI__Expert 8885 points
    Duncan,
    Additional precuation to prevent EVM damaged at first power-on: We suggest to put a bulk cap on the EVM. We suspect it is because the power supply cable may be long and the inductance of the cable bring in big over voltage to the EVM.
    Milan