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Motor stuttering on slower speeds

CSchw.2
Associate

Hello,

I finally have my 70W 6PP BLDC motor running after lots of digging around the forum.

I am using hall sensors (with unknown placement offset) and configured the board hard and software-wise (remove jumpers JP9-11 and close JP5-7).

Unfortunately I can not get the motor to run properly on slower speeds.

When going below ~500rpm, the motor starts to stutter and make a loud "whistling" noise.

I tried changing the electrical placement offset in 10° steps and it got a bit better, but not 100%.

Edit: The reliability of the RPM gauge-graph is flipping between 200 and 800rpm when setting the speed to 500rpm.

When running at 1000rpm it is between 980 and 1020 (which is completely acceptable of course).

I know those information are vague - but does anyone know what might be the cause of this?

Many thanks and best regards

Christoph

1 REPLY 1
Laurent Ca...
Lead II

Dear @CSchw.2​ 

What are the characteristics and reference of your motor?

Best regards