Research on Optimal Design of Commutation Performance of Starter-Generator Used in Aero-Engine

Compared with the conventional motors used on the ground, the DC starter-generators (DCSGs) for aero-engines have higher electrical, thermal, magnetic and mechanical loads. Excessive electrical loads will increase the armature reaction of the (DCSGs) and worsen the commutation performance, thus shortening the lifespan and reducing the reliability of the DCSGs. In order to improve the lifespan and reliability of the DCSGs, this paper studied the effects of compensation windings, commutating poles and brush sizes on commutation effect of DCSGs based theory analysis combined with numerical analysis. Then effective measures to improve the commutation performance of this type of DCSGs are proposed, and the commutation electric spark observation test of a certain type of DCSG verifies the effectiveness of the optimization design measures proposed in this paper.