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MCT8316ZTEVM: Motor vibrates but does not turn

Alcor Hilliard
Prodigy 35 points
Part Number: MCT8316ZTEVM

I have a Lin Engineering motor BL16B24-08D-05RO connected to the MCT8316 eval board. I followed the startup guide and connected everything in the right order (I triple-checked), but all it's doing is vibrating in place as I turn the potentiometer. I'm not sure where to go from here. I'm running it at 24VM, just vanilla code and default settings, digital Hall outputs with the appropriate jumpers in place for those. I'm certain it's not the orientation of how the phases are connected -- I tried every permutation of that and the same thing happened.

It's a 3-phase, 8 pole pair motor. I'm using the GUI online. Help?

  • 0
    TI__Expert 5578 points

    Hi Alcor,

    Thanks for your question on the Motor Drives E2E Forum. 

    Could you please attach the motor datasheet so I can take a closer look?

    Just to make sure I understand correctly, you were able to find the MCT8316ZTEVM EVM users guide and are using that to get started and make sure all of the connections are good? The vibrating in place makes me believe its getting sent straight to motor lock. 

    I'll need some more information to work with here. Can you send me some phase voltage and phase current waveforms?

    Best,

    Robert

  • 0
    Genius 5040 points

    Hi Alcor,

    Alcor Hilliard said:
    I followed the startup guide and connected everything in the right order (I triple-checked), but all it's doing is vibrating in place as I turn the potentiometer.

    Can you capture the Hall signals while turning the motor shaft? You might need to disconnect the 3 motor phase wires to turn the shaft easier. Without the proper Hall signals the driver will not be able to drive the motor.

    Better yet, capture the 3 hall signals and the 3 phase voltages (disconnected from motor) together while turning the motor fast by hand.

    Brian

  • 0 in reply to Brian Dang
    Prodigy 35 points

    Just tried looking at the Hall sensors. They aren't getting fully pulled down, and I have no clue why. They're just bumping down a little (200-300mV) and not actually doing a full 3.3V-to-ground digital pulldown. But they're single-ended, I can't imagine they're analog.

    I tried a second one of these motors, same thing. They're not broken -- they just work like this? I don't know. It does make sense that this would make for poor driving, but I'm not sure where to go from here.

  • 0 in reply to Robert Wedan
    Prodigy 35 points

    The datasheet is paltry, but here you go. We're using the highlighted one. Annoyingly, I don't think Lin Engineering even makes this anymore, so I'm just low on resources. They're on to the BL17 series. BLDC16-NEMA 17 Specifications.pdf

    Yep, I followed the user guide and checked all the connections. I've enclosed an image of Phases A and C sadly vibrating (voltage).

  • +1
    Prodigy 35 points

    I'm super sorry, everyone. Please close the thread. The datasheet didn't mention 5V was required for proper Hall function, but I saw it on one of Lin Engineering's other motors, so I thought I'd raise the voltage from 3.3V to 5V and give it a shot. Now it works. This is all on me -- so sorry.

  • 0 in reply to Alcor Hilliard
    TI__Expert 5578 points

    Hi Alcor,

    No problem, thanks for the update!

    We will close this thread.

    Best,

    Robert