With the TMS320F2838x MCU, due to its higher level of integration, it is possible to implement fast current loop (FCL) algorithms that provide a high current loop bandwidth with the same external hardware as used in classical FOC methods. TI has developed the FCL algorithm on this MCU and implemented it on the Design DRIVE IDDK platform.
With a 10kHz PWM carrier, the current loop gain crossover frequency is expected to exceed 3kHz, and the closed loop bandwidth is expected at about 5 KHz (per NEMA ICS 16 and Chinese GBT 16439-2009 guidelines) and the maximum duty cycle is expected to be approximately 96%.
Using TI’s Software Frequency Response Analyzer (SFRA) library, frequency response analysis of the current loops can be performed in real time to verify the above benchmarks. Dynamic frequency response analysis in real-time on a motor drive system is unique among MCU suppliers and is currently capable only on C2000 MCUs.
To read the full paper from Texas Instruments, click here.
