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DRV8305: BLDC motor is 1400kv, how to calculate whether the current is enough?

Josh Wang
Prodigy 100 points
Part Number: DRV8305

As title, the BLDC motor is 1400kv, how to calculate whether the current is enough? Is there a formula?

  • 0
    Prodigy 40 points

    We suppose to use DRV8305 as an ESC controller for driving a BLDC motor for drones. The selection of MOSFET will be necessary in order to meet BLDC 1400kv specification. We need TI's help in selecting a suitable ESC controller with MOSFET for drones. Please provide a selection guide for them. Thanks!

  • 0 in reply to Frank Lee
    TI__Mastermind 23676 points

    Hey Frank,

    Please consult the BLDC selection guide application note:

    https://www.ti.com/lit/an/slvaes1a/slvaes1a.pdf

    Current draw for a motor depends on a lot of aspects with the main consideration being the load on the motor.

    Please let me know if you have any questions.

    Best Regards,

    Akshay

  • 0
    Genius 5040 points

    Hi Josh,

    1. Do you have the datasheet for the motor? 1400Kv is the part number, or it is a 1.4Mega volt supply voltage?? Slight smile

    2. Motor datasheet alone is not enough to answer your question; What is the motor max speed and what is its load at that speed, in the application? With Max speed and load torque, then from the spec of motor Torque Constant Kt, you will find out the current for that load torque, but you need to know backemf at the speed, then subtract the backemf from the supply voltage to have how much available voltage for generate the torque. With available volt, and divide it by motor (resistance + impedance by motor coil) to have available max current .

    Brian

  • 0
    TI__Mastermind 23676 points

    Hey Josh,

    Please let us know if you have any more questions.

    Best Regards,

    Akshay

  • 0 in reply to Frank Lee
    TI__Mastermind 18981 points

    Hi Frank, Josh, 

    Closing this thread - please let us know if you need further assistance, and help mark the answer above as 'resolved' if it answered your question. Thanks!

    Best Regards, 
    Andrew