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FOC vs. BLDC

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CTSchorsch
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VESC Free
Joined: 2018-07-13 09:55
Posts: 101
FOC vs. BLDC

Hi all,

i have a custom PCB based on Benjamins 75/300 schematic running. I use it in a underwater diving scooter. I started with some tests in FOC mode, but every time the duty cycle reaches 65% the motor stops with a loud squeaking. I disabled my custom app and control the motor with vesc-tool.

FOC_1.png

the behavior is the same, independent if i use duty cycle, current or rpm control. The "jump" to maximum duty cycle occurs right after slightly increase duty/current/rpm via vesc-tool.

Has anyone an idea what this jump is ?

In BLDC Mode, everything is fine:

BLDC_1.png

But BLDC mode is much louder and under water you hear the motor over meters, so FOC is appreciate

Any hints to solve my problem are  welcome :)

Thanks in advance

Georg