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TMS320f2809 for sinusoidal commutation

Sayantani Banerjee
Prodigy 20 points

Other Parts Discussed in Thread: TMS320F2809

I am facing too much delay in operation when i am using the TMS320f2809 for my application. 

I need to perform sinusoidal commutation with a switching frequency of 40kHz . It is a high torque low speed application and our motors are running in 48V . 

This processor is taking too much processing time that is exceeding the control loop time. 

I have doubt that - Is there something wrong with my coding because of which more of assembly instructions are getting involved . 

This I can verify only if I am sure that I am working on the rite processor for my application. Please help me out. 

  • 0
    TI__Guru** 119680 points

    Are you using InstaSPIN 69F or 69M?

    If so, simply decimate the PWM clock appropriately in user.h

    I would use 42 MHZ pwm and use (3) to get the inner control to 14 KHZ.   Then you can further divide by (2) if your application accepts 7 kHz control or estimation.

    All of the default projects for the DRV83x based kits use 45 KHz and /3 as the default.