The Regenerative Energy(3) z How to Select a Regenerative Resistor E RE : Regenerative Energy (Joules) J S : System inertia (kg-m 2 ) N 1 , N 2 : The original speed and final speed (r/min, rpm) - W R = (E RE -E c ) / t decel ; R max =(370) 2 / W R W R : Power dissipated on resistor (watts) Ec : Energy stored in capacitors (Joules) R max : The maximum allowable resistance (ohm) -E RE = J S * ((N 1 ) 2 - (N 2 ) 2 ) / 182