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Original question:

DRV8306: Oscillation mode,encoder feedback control

DRV8306: Sensored and Sensorless driver

Sayali Shinde
Prodigy 60 points
Part Number: DRV8306
Other Parts Discussed in Thread: MCT8329EVM, MCF8329EVM, , DRV8329, DRV8323

Tool/software:

Hello Team,

  We have below evaluation board for BLDC motor testing. with this board we have tested BLDC motor in trapezoidal sensored mode.

But now we want to implement  sensorless mode using FOC algorithm.

1. DRV8306EVM

2. MCT8329EVM

Our motor ranges from 1 to 4 pole pair and having max speed upto 60Kprm 

Please suggest out of above board which board will be suitable for sensored and sensorless mode.

Regards,

Sayali

  • 0
    TI__Mastermind 24510 points

    Hi Sayali,

    Maybe I am misunderstanding so please let me know if I do not answer your question.

    The DRV8306 and MCT8329 both integrate the commutation algorithm and cannot be modified. the DRV8306 integrates a sensored trap algorithm and the MCT8329EVM integrates a sensorless trap algorithm. For sensorless trap use the MCT8329EVM for sensorless FOC use the MCF8329EVM.

    Please keep in mind, the integrated FOC algorithm in our MCF devices can reliably spin motors up to 1500 Hz. Faster speeds can sometimes be achieved but this is largely dependent on the motor parameters. Due to this speed limitation, 60000 rpm can only be reliably achieved for the single pole pair motor.

    If you are looking to develop your own algorithm or use an insta-spin based algorithm I would recommend using the DRV8329EVM.

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    Prodigy 60 points

    Hello Joshua,

       Thank you for suggestion, Yes we will implement our own algorithm , so just to reconfirm with DRV8329 we can implement both right sensored and sensorless algorithm for BLDC motor.

    can this can be able to spin motor with 1 to 2 pole pair with 60Krpm max.

    and how about DRV8323 it supports 1xPWM, 3xPWM, 6xPWM and also has Current sense Amplifier, Hardware Management I/F, SPI/I2C, Smart Gate Drive.

    can we consider this option also for sensored and sensorless.

    Regards,

    Sayali

  • +1 in reply to Sayali Shinde
    TI__Mastermind 23526 points

    Hey Sayali,

    For DRV8329 or DRV8323 the commutation is implemented externally with an MCU so they can do either sensored or sensorless depending on your system design. The speed of motor will be dependent on how fast your MCU can process the commutation and current sense measurements.

    Both DRV8329 and DRV8323 are viable solutions for 60V abs max systems. With DRV8329 you get only one CSA so for FOC implementation this should be considered as 3 shunt FOC is more common. However, both are possible.

    Best,

    Akshay