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DRV10964: Reducing start up time

Tyler Holmvik
Intellectual 811 points
Part Number: DRV10964
Other Parts Discussed in Thread: MCF8315C, DRV10983-Q1

Tool/software:

Hi - 

I understand motor needs to follow defined initialization and motor start-up sequence procedure in Figure 14 in datasheet.

Customer wants to reduce time to steady-state closed-loop control following a button push by user. My question: can calibration and alignment steps be completed prior to button push by user to reduce time to start motor? Or do calibration and alignment need to happen in sequence just before accelerating? 

Wondering if motor can stay at 0 speed after calibrated and aligned? And then ramp up speed after button push? That would save some time. 

Thanks,

Tyler

  • 0
    TI__Genius 16325 points

    Hi Tyler,

    The calibration (KT measurement) is happening upon "power UP" and when speed command provided device starts with  start-up->open-loop spin->measure kt->close loop ramp.

    Using PWM stop motor, do not power up and start again and verify.

    Thanks and Best Regards

    Venkatadri S

  • +1 in reply to Venkatadri Shantaram84961
    TI__Intellectual 811 points

    Thanks. So is my understanding correct for timing?

    1. Power on
    2. Calibration is completed after power on, can assume this 40mS will be complete before needing motor to start.
    3. User button press to start
    4. Align takes 640mS (includes 300mS ramp to 50% duty)
    5. Accelerate will vary depending on handoff threshold. A lower threshold will minimize time. This will take some testing. Time TBD. 
    6. Closed loop operation

    So is it reasonable to assume that after button press, motor will spin up in 1 second total?

    Tyler

  • 0 in reply to Tyler Holmvik
    TI__Genius 16325 points

    Hi Tyler,

    You have listed it correct. What is your motor parameters, rating in terms of Voltage, current and speed?

    If more than 5V then you can look into other solutions from TI, DRV10983-Q1 for sinusoidal commutation, MCF8315C/MCF8316C for FOC based.

    Please share your application requirements and motor specification.

    Thanks and Best Regards

    Venkatadri S