Inerzia and fiction brushless motor

[SDall]

Hi, I wanted to ask a question about brushless and MCSDK motors. When buying a motor, inertia is often listed, but friction isn't. Can I calculate friction using inertia, or is friction a parameter that can be omitted?

[Gael A]

Hello SDall,

Friction and inertia are mechanical characteristics of the motor that are used for PID Speed Gains determination. We provide a piece of software called the MotorProfiler to estimate those two values and compute the Speed PID gains. You can find more information on our wiki : https://wiki.st.com/stm32mcu/wiki/STM32MotorControl:STM32_MC_Motor_Profiler_-_Start-up_guide

[SDall]

So is it important for the Hall sensors to be connected to the motor profile process? I tried without, but the configuration got stuck halfway and wouldn't continue.

[Gael A]

Hello SDall,

Hall sensor connection is not mandatory for profiling your motor. If the profiling takes too much time or gets stuck, don't hesitate to tinker with the speed and current values to see if the behaviour improves.