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CCS/TMS320F28035: PMSM FOC with Hall sensor project issues.

pujit gandhi
Prodigy 230 points

Part Number: TMS320F28035

Tool/software: Code Composer Studio

Hi All.

• I'm using TMS320F28035 controller to develop FOC code for PMSM motor with Hall sensor.
• I've isr timer running at 2khz , switching frequency of my mosfet is 10khz (epwm1b, epwm2b, epwm3b) , ecap module is also included.
• When I run motor via ramp control , I am able to sense speed via ecap module.
• However , when i make position calculation transition from ramp control to position calculation from data received from hall sensors, speed of my motor decays with time.
I don't think I am doing anything wrong codewise . But still I want to know the reason why speed decayed.