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TMS320F28069: TMS320F28069M: Sensorless scheme‘s requirements for switching frequency of IGBT

GUANJIE YU
Prodigy 20 points
Part Number: TMS320F28069

Recently,because of the need of a project, we need to develop a high-power driver for a PMSM, and we need use sensorless scheme. I wonder whether TI's Sensorless scheme requires IGBT switching frequency, and whether 4KHz switching frequency will affect the estimation of position, speed, etc.

  • 0
    TI__Guru** 109650 points
    Sensorless InstaSPIN-FOC can support the 4kHz switch frequency that is fine for most sensorless pmsm applications, and the control frequency depends on the maximum electric frequency of motor and response requirement of your system. Higher control frequency will have a good dynamic response performance.
  • 0 in reply to Yanming Luo
    Prodigy 20 points
    Thanks for your answer.
    Because of our driver's power is 200kW, does the sensorless InstaSPIN-Motion still meet our requirement? 4kHz is stll OK?
    In addition, what is the requirement for dynamic response of phase-voltage acquisition when we use sensorless InstaSPIN-Motion in the case
    of 200kw？
  • 0 in reply to GUANJIE YU
    TI__Guru** 109650 points

    Actually, the 4KHz control frequency is not a good choice for both instSPIN-FOC and InstaSPIN-Motion, both can work well, but maybe not to achieve a better performance. You might use 4KHz PWM frequency limit the high power IGBT module, but you could use a higher control frequency if you are using a hall sensor or inline shunt for current sampling.