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o-devices / bldc-ffb-wheel

DIY FFB Wheel project based on STM32 controller board and BLDC motor
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Braking resistor #8

Closed ba114 closed 2 years ago

ba114 commented 2 years ago

What value braking resistor should be used? 19.5v 12.3A power supply. The schema shows a picture of a 50W 12R. I read on your forum that you use a 50W 10R and have read about others using 50W 2R and 50W 5R.

olukelo commented 2 years ago

It will work with any of them. The idea is to choose resistor and then adjust Braking resistor limit on hardware tab. I sucesfully used 2R and 10R resistors. First you connect resistor and start with 1% of Braking resistor limit. Then start increasing it by 1 tick and experiment - you need to stop at the point when PSU stops to go into overvoltage protection mode. For example for my PSU (15v 13A) it works with value 5% for 2R resistor and 10% for 10R resistor. I will update README file with this information as well

ba114 commented 2 years ago

does it create a braking effect at all times?

olukelo commented 2 years ago

No. Firmware constantly calculates how much current need to be dissipated and apply needed value to braking resistor.

ba114 commented 2 years ago

Resolved with latest update to readme