2023-10-09 03:18 AM
I refer here:https://wiki.stmicroelectronics.cn/stm32mcu/wiki/STM32MotorControl:How_To_manually_configure_the_motor_parameters
Below is the profiler's result. Ke=9.59 Vrms/kRPM.
Below is my owm test.
Vpp=13.6v,pole pairs=5,fbemf=83.33Hz. Ke=(13.6*5*1000)/(2√2*83.33*60)=4.8085 Vrms/kRPM.
I wonder if I chose the wrong frequency?Is it between point A and point B or pointA and pointC?Thanks.
2023-10-10 02:08 AM
Hello @gtop.1,
The frequency you chose is correct. I would be more in favor of definition issue regarding the pole pairs number to explain your factor 2 difference between the profiler output and your computation.
Regards
Cedric
2023-10-11 01:20 AM
My motor ' poles is 10 (pole pairs is 5). Do you mean that calculate the Ke should use the poles not pole pairs?
2023-10-11 04:44 AM
If you look at this documentation How To manually configure the motor parameters - stm32mcu
Paragraph 2 Pole pair (number) parameter .
It is stated :
So if you have 10 stable positions, then your pole pairs number must be 10.
Regards
Cedric
2023-10-11 08:27 PM
Unfortunately, it have 5 stable positions.This confuses me and I don't know what the problem is.
2023-10-19 09:30 PM
Is there any other possibility?
2023-10-20 01:17 PM
Could you describe accurately how did you generate the oscilloscope dump ?
How did you spin your motor for instance ?
Cedric
2023-10-31 09:37 AM
Hello @gtop.1,
No news ?
how did you spin your motor to generate your waveform, did you plug it to any electronic other than the scope ?
Cedric