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The mathematics supporting control of a 3-wheel swerve robot is defined - both chassis-centric and field-centric control modes are considered.
3-wheel swerve control logic - The Trouble with Tribots
Changes in the FRC perimeter rules make a 3-sided robot more attractive (and potentially stable) than under the 28x36 rules. At the same time, 6-CIM tank drive has become the drive-train standard for FRC robots. How to compete with 4-wheel independent swerve? One approach is being explored by FRC 1640 - Sab-BOT-age.
Tribot_white_paper.pdf
Tribot_worksheet.xls