Research On Commutation Spark Suppression Of Aviation Dc Starter Generators

The aero DC starter generator works in the high altitude environment of water shortage and oxygen deficiency. The commutator spark generated by high current and high speed causes the high temperature ablation of the commutator plate on the surface of the commutator. At the same time, the electromagnetic radiation generated by the commutator spark causes interference to the communication system of the aircraft. According to the classical commutation theory, the commutation mathematical model of the commutation generator is established, and the suppression measures of commutation spark are studied from the aspects of electromagnetic optimization and mechanical test. Firstly, the influence of the calculated arc coefficient of the main pole on the commutation of current is studied from the electromagnetic point of view. When the calculated arc coefficient is 0.65, the motor is approximately rectilinear commutation. When the brush coverage coefficient is 2.41, the smaller reactance electromotive force reduces the commutation current, and the impact on the motor starting performance and power generation performance is ignored. Then, experiments were carried out on different brush materials and different brush pressures from the perspective of mechanical structure. The results showed that when 52kPa brush pressure and TDQ52 core post brush were selected, the pulsating voltage was reduced from 0. SSV to 0.53V, and the commutation spark of the motor was significantly reduced in both starting and generating states. The measures taken are of great value for improving the quality of the motor aviation power supply and prolonging the service life of the motor.