PMSM FOC - mircocontroller POR reset after torque applied

Discussion in 'Automotive Electronics' started by Krzysztof Bieda, Aug 3, 2016.

  1. Krzysztof Bieda

    Thread Starter Member

    Jan 5, 2016
    32
    0
    Hello Everyone,

    Has anybody had problem like that:
    My motor spins well with PMSM FOC control.

    When I apply torque ( on PSU 24V, 12A) then dsPIC restarts.
    I have even cheched and programed to show me the cause of restart -> it is Power-on reset.

    It is not a spike on 3.3V. I have checked it many times and with many people, because that
    was the first think anybody adviced me.
    Three is stable 3.3V all the time ( I have added 470uF there to be sure - only for time when I struggle
    with that fault).

    Best regards,
    Chris
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    Is the motor ground well separated from the dsPIC ground?
    The motor should have a completely separate ground to the the power supply from the dsPIC.
     
  3. Krzysztof Bieda

    Thread Starter Member

    Jan 5, 2016
    32
    0
    They have common ground, but thankfully connected only in one place.

    Does it mean that I have to apply isolated dcdc the best?
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    How are you obtaining the 3.3v from the 24v supply?
    Max.
     
  5. Krzysztof Bieda

    Thread Starter Member

    Jan 5, 2016
    32
    0
    I get 5V from 24V ----> TSR 1-2450 TRACO POWER

    That 5V supplies encoder and Voltage buffer for PWM control signals.

    Later I do 3.3V from that 5V using LDO linear regulator.

    I checked that 3,3V -> no spikes;d
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Have you actually seen what happens on the 24v when torque is applied?
    Max.
     
  7. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    A single point ground is good, but not sufficient.
    Where exactly is this "one place".
     
  8. Krzysztof Bieda

    Thread Starter Member

    Jan 5, 2016
    32
    0
    Driver consist of 2 PCBs connected like sandwitch.
    I can simply resolder some headers and check.
     
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