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TMS320F243

Cobus Verster
Prodigy 20 points
Other Parts Discussed in Thread: LAUNCHXL-F28379D, BOOSTXL-3PHGANINV, BOOSTXL-DRV8305EVM

Hi Guys,

I am building 4 phase SRM motors and would like to go sensorless. The TMS320F243 DSP board from Spectrumdigital demo shows a 3 phase SRM control system. However I use 4 phase SRM control and need to know where I can get hold of the 4 phase equivalent please.

I already have the IGBT drive and Micro control, but with ABZ encoder input.

Regards

Cobus

  • 0
    TI__Mastermind 27240 points
    3 phase is the common topology for many users and therefore what is available in market is that one. 4 phase may have to be custom made. If it is a low voltage motor, then you could get two three phase inverters and use 4 of the half bridges. The easiest thing that comes to mind is the combination of c2000 launch pad (LAUNCHXL-F28379D) + 2 x 3-phase inverters such as BOOSTXL-DRV8305EVM or BOOSTXL-3PHGANINV. You can refer to the document below for an idea.

    www.ti.com/.../spracb8a.pdf
  • 0 in reply to Ramesh Ramamoorthy
    Prodigy 20 points

    Good day Ramesh,

    I received your email and tried to answer back but the system did not allow that.

    I apologise for the silence, was really busy and could hardly look at emails and TI messages. Thank you for your message and references. I am only going to read them this morning. My biggest concern is positioning  not the rest, because the rest  is designed and working. Using an absolute encoder on the first prototype starter worked very well. However I need to reduce cost and that is why I am looking at economic positioning for the Switched Reluctance Motor or preferably sensorless. Looking at logging the currents of all 4 phases together with ABZ encoding and then only use the currents waveforms in a lookup table without the encoder realtime input may be a possible way? I like the inductive sensoring concept and is pursuing that also, but while I am in this position, I need to find the most economic and realiable way for 4 phase SRM, which is why I am on this forum to begin with. I have more products to discuss later on. Hope this makes sense.

    Regards

    Cobus