Speed Feedback error

[Cedd]

Hello,

I am currently working with a custom board using an STGIB15CH60TS-LZ driver and an STM32H503RBT6 microcontroller.

The motor is a 48V, 500W, 300 RPM brushless motor with three Hall effect sensors (120° mechanical angle, 300° electrical angle). It is used in an electric bike.

I am using the FOC algorithm with:

• Single shunt resistor
• 16k PWM generation
• Hall sensors as the main sensor

Everything works correctly, but I sometimes have an issue at startup and under load. Once the motor is running, the issue does not occur.

The image shows the three Hall effect sensors during a failed startup. In this case, the issue comes from the C2 signal.

I believe the problem is caused by small movements in the opposite direction of the expected motor rotation for the FOC algorithm. The motor controller returns a "speed feedback" error.

I am looking for a solution to prevent this error in the FOC algorithm since the reverse movements are unavoidable.

Thank you.

[GMA]

Hello @Cedd,

Firstly, we would like to apologize for the delay in replying to your post.

Did you base your custom board on STEVAL-IPM15B board? If yes, did you check your HALL signals after the RC filtering?