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BLDC vs Stepper Motor

Ashkan Golestani85
Intellectual 775 points

Other Parts Discussed in Thread: ASH

Hi ,

I have an application that it needs the motor to open and close the valve . Start-up the motor requires full tourqe.

Aapplication invironment is Hi-Temp,Hi-Pressure( 180degree C---20,000 Psi) .Some stepper and BLDC exist to meet that requirment .

What motor can produce the most start-up torque (BLDC vs Stepper) ?

By the way ,I am using F28069 for controller .

Thanks

Ash

  • 0
    TI__Genius 14487 points

    Hello Ashkan,

    It's difficult for me to say which has more torque. Motor torque is a function of motor construction and motor current. I'm inclined to think that stepper motors will have more torque because there is a shorter "step length" between phases than you will have in a BLDC. For this kind of solution, a stepper motor may be easier to implement. Also, BLDCs may require positional feedback depending on how you plan to drive them. Steppers do not require positional feedback. However, the stepper motor may be heavier. I recommend checking with a motor manufacturer to decide.

  • 0 in reply to James Lockridge19
    TI__Genius 14487 points
    Ashkan,

    One question, do you plan to have your circuit board exposed to temperatures up to 180 C? I only mention this because most IC chips cannot handle that temperature. The F28069 goes up to 125 C.
  • 0 in reply to James Lockridge19
    Intellectual 775 points
    Hi James,
    Yes ,You are right .BLDC is hard to control compare to Stepper .Weight issue is not big factor for me .As You mentioned about the "Step Length" ,I think that is biggest factor . Current is similar for both devices . Stall Current is higher in stepper ,which It is a sign for higher torque on stop . I am comparing the best motor in market (Aerospace/ Subsea / military).
    Thanks for info .
    Ash
  • 0 in reply to James Lockridge19
    Intellectual 775 points
    James,
    For prototype version ,I am using F28069 and I will test it for 120 Degree C . I need to test the motor reaction for that temperature .I'll use High temp one for final product .
    Thanks
    Ash