TMS320F28379D: Software resolver: how to get high accuracy arctan value

Sheldon He

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hi expert,

My customer is designing software resolver with C2000 device. When calculating theta (rotor position), error will become large when theta is close to 90 degrees (cos theta is close to zero).

I'd like to know how to achieve the best accuracy or arctan even with cost of more MIPS. Could you make cos theta and sin theta float64? Could we calculate arctan with return type of FPU64?

Our device is F28379D

Thanks

Sheldon

over 4 years ago

0 Sheldon He over 4 years ago

TI__Expert 8585 points

Hi expert,

Any feedback here?

Thanks

Sheldon

0 Shanty over 4 years ago in reply to Sheldon He

TI__Expert 5410 points

Sheldon,

Apologies for the late reply. You can use the libraries for FPU32 from C2000ware. The FastRTS library provides high performance support for calculating atan. Please refer the documentation provided within the library. Could you provide more context about your application so I can give you a more specific answer?

-Shantanu

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28379D: Software resolver: how to get high accuracy arctan value