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Meeting W3
Date
August 17, 2020
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Introduction to my FYP
Three main objective
Provide position feedback from the motor at high RPM
Log/Scope the inverter data
Design a interface platform (PCB/Additional hardware) for highspeed I/O (CAN & BiSS & SPI)
Ary's Minutes
Main topic for FYP is position feedback by using BiSS encoder
On the BiSS side, able to get signal in from encoder at 8 MHz, able to perform CRC correction
BiSS implementation done on Simulink using SPI
Encoder currently has some skew issues, where the clock and data phases don't align
Another issue is that the SPI buffer size is only 16 bits and the data is 23 bits
Currently SPI collects 16 bits, has a small delay, and then takes the remaining bits
Issue is with delay
Most promising is to use something provided by TI, code designed by control systems suite, but code was designed in 2015 and not updated
Trying to use this code at the moment, but getting compile errors - trying to resolve errors at the moment
Posted on TI forums but not getting useful feedback at the moment
BiSS encoder verification - test jig to verify whether encoder can support high RPM
Will spin a motor at 30k RPM and see whether BiSS can support these high speeds
Next thing Boon is implementing is a scope function
Currently not sure where the logging is going to be done, whether it'll be on an additional board or on the Delfino itself