Master’s students, Somudro Gupta (demonstrator) and Pius Wong (video) show their work on design and control of our new holonomic base Tricky. Tricky employs omni wheels set in a triangular configuration to achieve omni-directional force control. It uses three Maxon motors rated at 250W with 3 stage planetary gears and 60 gear ratio providing 18Nm of torque per wheel. To control the torques, we have developed a new amplifier board capable of doing both current and load cell feedback. The board uses a Freescale 8-bit MC9S08MP16 microcontroller to achieve servo rates of 4KHz. The movie shows force interactions between the base and a user, based on servoing torque feedback.
Master’s Project: Tricky, Force Controlled Holonomic Base
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