Can the resolution of the motor speed measurement code be increased?

[BTrem.1]

I have an application where I am running a light inertia motor (6 pole-pair) at a constant speed of nominally 1800 rpm. In this application I need finer control than is provided by the speed measurement resolution. I am already using SPEED_UNIT _001Hz.

Is there any means to modify the code so that I can improve the resolution by a factor of 4 or 5? I am going through the Motor Control files and trying to figure out where I might make the necessary modifications.

[Laurent Ca...]

Dear @BTrem.1​ 

Welcome to the STM32 Community

Could you give more details to the STM32 Community about your setup -the material you use- ?

(HW and also SW: CPU(s), tools and versions, board(s), motor(s) and so on)

And more especially did you use STM32 MC tools (such as MC_suite, STM32 MC Motor Profile, STM32 MC SDK, STM32 MC Workbench, the used example, the origin of the base of your application source code, and so on)?

Best regards

[BTrem.1]

The initial code was developed for a STMG431 64-pin device on a NUCLEO board using the STSPIN233 driver board IHM17M1. I built the code with CubeMX after using the motor profiler. Since then I manually converted the program to the 48-pin device STM32G431 on a custom product board using the STSPIN233. I use STM32CubeIDE 1.50. I also make use of the motor control Workbench 5.45. The motor is a 6-pole-pair BLDC driven from a 5V bus. The start current is about 700mA and the steady state run current at 1850 RPM is about 35mA peak.

Another way to ask the question is doe the procedure MC_GetMecSpeedAverageMotor1() respect the define define SPEED_UNIT _001HZ ?