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DRV8300: Driver request for 50V 3kW 60A BLDC motor

Donald Adede
Prodigy 90 points
Part Number: DRV8300
Other Parts Discussed in Thread: DRV8353R

Hello,

I would like suggestions as to what driver I need to design a BLDC motor driver for a 3 phase 50V 3kw motor with Rated continuous current of 80A maximum phase current of 200A

From reference designs available on TI, I have noticed 2 mosfets used on a phase but cannot determine in they are series or parallel connection, can i possiblly use the DRV8300 and have more than 2 mosfets per phase connected in parallel?

  • 0
    TI__Mastermind 21805 points

    Hello Donald,

    The team will get back to you tomorrow!

    Thanks,

    Matt

  • 0 in reply to Matt Hein
    TI__Mastermind 23045 points

    Hey Donald,

    Thanks for the question. In order to operate a high power 50V motor we recommend having a voltage margin of at least 1.5 to 2 times the maximum voltage. The reason we recommend this is because at motor startup and breaking you will see changes to your power supply voltage, causing either voltage sags or spikes due to the changes in the current draw. In your case, we would recommend 75-100V abs max.

    The external FETs is what you see on some reference designs, which are two MOSFETs in series per phase known as a half-bridge. A high-side and low-side MOSFET are needed in each half-bridge. You can also put MOSFETs in parallel to increase the current capability, for example having two parallel MOSFETs per high-side switch.

    If you have some time I suggest reading this application note on motor driver considerations: https://www.ti.com/lit/an/slvaes1/slvaes1.pdf

    This app note better describes design considerations in high power motor driver applications: https://www.ti.com/lit/pdf/SLVAF66

    The devices I would suggest to look at would be:

    DRV8300

    DRV835x (for example, DRV8353R)

     

    With the DRV8300 being a simpler device and the DRV835x having more built in features and potential configuration or diagnostic capabilities.

    We do have a motor drive reference design enabling up to 1.5kW, however we do not have any reference design available that can drive higher current: TIDA-010056 54-V, 1.5 kW, >99% Efficient, 70x69 mm2 power stage reference design for 3-phase BLDC drives | TI.com