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TMS320F28027: TMS320F28027

TEENU JOSE
Prodigy 120 points

Part Number: TMS320F28027

Hi,

     I am using TMS320F28027 controller for the sensorless control of a low inductance motor. Everything  is working fine. But i want to reduce the heat consumption further. As per my understanding trapezoidal method consumes less power compared to FOC. Can anyone suggest some method to reduce heat in FOC to get trapezoial performance. Also please do explain the role of PWM frequency and external inductance in heat production.

  • 0
    TI__Guru** 117140 points
    The thermal is based on the total loss of the power module, that includes IGBT loss and Free Wheeling Diode (FWD) loss. The IGBT loss includes steady state conduction loss and switching loss, and the FWD loss includes steady state conduction loss and reverses recovery loss. The conduction losses for the IGBT and freewheeling diode are the inverter of the current flowing through the collector or anode and saturation voltage over the conducting period. Often, FOC should have better performance than trapezoidal control since the total current of FOC is less than a trapezoidal solution.

    In contrast, the switching losses happen as a result of energy loss during the transition and switching frequency, the trapezoidal solution will have an advantage if both solutions use the same switching frequency.

    In summary, I don't think the trapezoidal solution has better thermal performance than FOC solution, especially under the high power and high current state.

    You might optimize the switching frequency to reduce heat consumption if possible. Or try to use a low Rdson IGBT/MOSFET power module.