When braking at max speed and with maximum motor current, the power that is dissipated in the power resistor can be calulated as: P_brake = V_emf * I_motor where V_emf = motor_rpm / motor_kv. To be on the safe side, think about what speed and current limits you want to set for the motor. The power resistor values you need depends on your motor setup, and peak/average deceleration power. Depending on your machine, this may or may not be a problem. If you’re unlucky this will break the power supply.Īt some point, the ODrive’s overvoltage protection will trip, after which both motors will be allowed to spin freely. If your power supply doesn’t eat that power (which it won’t if it’s not a battery), the bus voltage will inevitebly rise. If you don’t have a brake resistor, the ODrive will pump excess power back into the power supply during deceleration to achieve the desired deceleration torque.
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