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DRV5055: ANGLE-EVM

na na78
Guru 16770 points
Part Number: DRV5055

Hi

Could you please answer the following questions?

1.

This EVM requires calibration every power cycle.

Is it possible to absolute angle detection?

I mean the system can detect the angle even if power cycle is executed.

2.

In general, could it be possible to be applied for counting motor rotation using the sensor configuration of EVM? 

If yes, can you tell us how fast the rotation speed can be detected?

BestRegards

  • 0
    TI__Genius 17990 points
    Hello,

    Thank you for using the TI forum. Below are my responses to your questions.

    1. Yes, it is possible to use this method for absolute angle detection. Our DRV5055-ANGLE-EVM does not store the calibration values in nonvolatile memory, but the the full source code is available on the EVM webpage (www.ti.com/.../drv5055-angle-evm) and can therefore be modified, if desired, to retain calibration values after a power cycle (external memory may need to be added to store all of the calibration values).

    2. Yes, in general you could count motor rotations by monitoring the absolute angle of the magnet and counting how many times you pass a given point. If you want direction also, you would need to keep track of the previous angle as well to see what direction the magnet has moved. As for speed, the DRV5055 has a sample rate of 20 kHz, so the motor would need to be spinning slower than that to count rotations.
  • 0 in reply to Mitch M
    Guru 16770 points
    H Mitch

    Thank you for your helpful information.
    I understood.

    BestRegard