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INSTASPIN-BLDC: Overmodulation strategy

Sanjeev Pandey1
Prodigy 10 points

Part Number: INSTASPIN-BLDC
Other Parts Discussed in Thread: MOTORWARE

Hi,

I am trying to develop FOC of PMSM. Currently, my focus is on

1. Overmodulation strategy. 

2. Smooth transition between under modulation and overmodulation

I was looking for Dave Wilson videos but I couldn't find detail analysis and design. I am looking for good study material or training videos. Please help me if it's available.

  • 0
    TI__Guru** 116650 points

    Download motorware which has example projects (lab10a) using overmodulation.

    http://www.ti.com/tool/motorware

    Find the InstaSPIN lab guide (instaspin_labs.pdf) in the folder of motorWare, the lab10a chapter has a detailed description of overmodulation implementation.

    C:\ti\motorware\motorware_1_01_00_18\docs\labs

  • 0 in reply to Yanming Luo
    Prodigy 10 points

    Hi Yanming,

    Thanks for your prompt response. 

    Actually, I want to understand first overmodulation so, looking for some document which is good from implementation point of view. I came across many literature but most of them are using trigonometric function which will increase  execution time significantly. 

    In the attached slide, Dave Wilson has talked about a simple method but I couldn't get any reference document on it. If available, please share reference document for this method or reference document on a similar overmodulation technique. 

  • 0 in reply to Sanjeev Pandey1
    TI__Guru** 116650 points

    As the slide you mentioned, the SVPWM implemented in MotorWare and MotorControlSDK supports over modulation automatically, you don't need to have any additional process when you set the USER_MAX_VS_MAG_PU is greater than (0.5).