how to calculate force using BLDC motor?

[LOGU]

im using stm32f4 series controller controls the BLDC motor.

the motor control the sliding door .now i want to calculate force of door?

what to do now . any suggestion??

[Javier1]

Electric Current eaten by the motor is somehow proportional to the force the motor generates.

1. So you need to measure the current (if youre using FOC modulation youre in luck because it works by measuring currents, but if you do trapezoidal it just measures backemf voltage and often they dont have a proper current measuring ic)
2. Find your ecuation relating amps to juls (test it)
3. Profit

[LOGU]

thanks @Javier Muñoz​  sir i will check