Unformatted text preview: together. (If there is no cooling, the heat will raise the winding temperature and eventually the insulation material will reach ignition point and catches fire.) The simulation is run until the speed reaches the rated speed which is around 0.05 slip (what is the rpm?). Note the stator current magnitude and torque at 0.05 slip. For each of the values of J in (a), (b) and (c), compare them with the largest values during the acceleration transients and note what the overload current ratio and overload peak torque ratio are. The mechanical strength must be able to withstand the peak torque. The i 2 R integrated over time is heat which raises the temperature of the windings and reduces the life time of the insulation. In your conclusion discuss which is preferred: a large or small moment of inertia?...
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- Spring '09
- Electric motor, stator windings