TMS320F280039C: How to configure three hall sensor input to GPIO for calculating the motor speed and rotor position

Hi Rahul,

I am not sure which TI example you referred to. But in the universal motor lab example in C2000Ware_MOTORCONTROL_SDK, if you set the speed feedback method as "HALL", it initializes three ECAP unit for each phase, which would probably act as a reference.

Thanks,

Jiaxin

Hi Jiaxin, I am not able to understand how they configure Hall signals for speed calculation 

Hi Rahul,

It may take some time to understand the peripheral configuration and debug. The example code are developed based on the hall sensors for the specified motor. You may need to make modifications based on your system. 

Thanks,

Jiaxin

void HALL_setParams(HALL_Handle handle, const USER_Params *pUserParams)
{
HALL_Obj *obj = (HALL_Obj *)handle;

obj->capScaler = 3.0f * 1000000.0f * pUserParams->systemFreq_MHz;
obj->pwmScaler = pUserParams->ctrlFreq_Hz / 2.0f;
obj->thetaDelta_rad = MATH_TWO_PI / 36.0f;
obj->timeCountMax = pUserParams->ctrlFreq_Hz / 1.5f; // 0.25Hz
obj->speedSwitch_Hz = 50.0f;

obj->hallPrev[0] = 4;
obj->hallPrev[1] = 3;
obj->hallPrev[2] = 6;
obj->hallPrev[3] = 2;
obj->hallPrev[4] = 5;
obj->hallPrev[5] = 1;
obj->hallPrev[6] = 4;

#ifdef HALL_CAL
obj->hallIndexFlag = 0; //
#endif //HALL_CAL

return;
}

Could you explain above program? what is the use of capScaler, pwmScaler , thetaDelta_rad , timeCountMax , speedSwitch_Hz.?

Hi Rahul,

Please understand the calculation of the variables by referring to the definitions in "userParams.h" and the calls in other locations of the example code.

Thank you,

Jiaxin