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DRV2624: Function of calibrating to find the resonant point

Part Number: DRV2624

Hello team,

  1. Can we see the accelerator response waveform externally while frequency sweeping to find the resonant point of the actuator?The purpose is to measure the frequency response of the actuator.
  2. Can we use the trig signal to set the start and stop frequency of the sweep, and then enter a trig to trigger the sweep?
  3. In the DRV2624, how much is the sweep frequency for the function of calibrating to find the resonant point, for example, F0 = 150 Hz with a measurement time of 500 ms?

Best regards,

Shotaro

  • Hello,

    There is no way to do a auto frequency sweep, only way to control frequency is putting in open loop and using the register to set open-loop frequency.

    The device in closed loop automatically detects resonant point without any sweeping or work done by the customer

    Does that make sense?

    Best Regards,

    Carson

    LPA Apps Engineer

  • Carson-san,

    Thank you for supporting. I want to confirm your comments.

    1. Only way to measure the frequency response is putting frequency with manual in open-loop mode, right?

    2. When DRV2624 detects the resonant point of the actuator, DRV2640 is in closed-loop mode and performs frequency sweep. But we cannot observe frequency response with a measurement equipment, right?

    Best regards,

    Shotaro

  • 1. Yes it would need to be in open loop

    2. That is not how the auto-resonance works, only way to get freq response is changing the open loop frequency register

  • Carson-san,

    Thank you for the comments.

    Do you have any idea for measurement of actuator response during calibration with vibration meter or something?

    Best regards,

    Shotaro

  • Hello Shotaro-san

    Among the tools we provide we have the accelerometer tool:

    www.ti.com/.../DRV-ACC16-EVM

    But is there no datasheet you have for this actuator? usually actuators come with resonant frequency provided in their datasheet. 

    ERMS do not have a resonant frequency, only LRAs or similar devices have this property. 

    Usually if you use the DRV2624 in open-loop you would be able to tell by just feeling it during the sweep as long as it is isolated via cushion from a hard surface and easier to do using a mass attached around 100grams. We use aluminum blocks that are shaped like the size of a cell phone.

    Best Regards,

    Carson