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Tabletop Dynamometer Stage 1

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    This project has been a long-time interest of mine, ever since becoming interested in PMSM motors for hobbyist purposes and using .  Even though it is one of the most important parameters to design around, many manufacturers and retailers do not publish torque data for their motors.  So, unless you are ordering from T-Motor, the best you can do as far as estimating the torque-speed curve is guestimating based off of the volume within the airgap and the torque constant (which is usually reliably given).  That is unless you have your own dynamometer and access to the motor.  Then you can just measure everything you need directly!      Another purpose of dynamometers that I would like to have my own rig for is robotic actuator characterization - so testing the motor and the transmission together.  Specifically, I am interested in low-ratio QDD transmissions paired with medium-sized brushless motors.  This is low-speed territory, so...
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3 Phase Controller V0.2 & V0.3

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     After the moderate success of the version 0.1 build of the 3 phase controller, I got to work on the next iteration.  I was now confident enough to use an IC package with no leads.  The DRV8323R was the obvious choice after this development.  It can do everything that the DRV8203 can do (and more) in a smaller package.  The additional features include one more current sense signal amplifier (this can help with detecting a short or leakage current in a 3 phase motor) and the option between parameter setting via SPI or passive components. This is the VQFN48 package I came up with a list of improvements that I wanted to see in the board: Get an assortment of resistors to change dead time with Correct the spacing for the block terminal and THT capacitor footprints Get rid of all thermal reliefs in the power part of the board Design for greater current flow and heat dissipation Use an XT-30 connector for power Enlarge the phase holes Breakout 3V3 f...
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