Pulsed generator is a power supplying device which generates high power electric pulse energy by means of the kinetic energy of high speed rotor stored in the form of inertial energy. In this type of generator, magnetic field is formed in the circuit of field winding and high magnetic flux density is developed by magnetic compression between the armature and compensating circuits. In this way, high current pulse can be discharged in a short time. If high current is discharged from the pulsed generator in a short time, high repulsive torque is applied to the rotor and a part of inertial energy of the rotor is transformed into vibration. Therefore pulsed generator should be carefully designed to assure the electrical and mechanical reliability during the operation.
Thus in this study, for the purpose of appropriate design of pulsed generator, stiffness effects of design parameters of the rotor are investigated theoretically as well as experimentally, and analysis of the characteristics of high damping bearing is accomplished. Namely, in order to estimate the stiffness of laminated rotor used in pulsed generator, the stiffness effects of lamination pressure and shrunk fit are evaluated by introducing the concept of equivalent stiffness diameter. In addition, the rotational stability at high speed is evaluated.
For the verification of the above results, small size pulsed generator of 3MJ capacity is designed and manufactured. Electric circuit for the generator is designed and its output current is analytically predicted. Interaction force between windings is estimated by the analysis of electromagnetic field and force, and the distribution of electromagnetic field and shear stress at air gap is evaluated to perform the structural analysis. With this generator, the distribution of electromagnetic field and design parameters for each winding are evaluated by experiment, and the validity of analysis and design. is presented by the evaluation of electrical performances under loaded and unloaded conditions.
Consequently, it is found that the natural frequency variation with lamination pressure and interference of shrunk fit has remarkable influence on the stability of rotor system. Also the validity of analysis and design is verified by proving that various types of pulsed output can be generated in compensated pulsed generator by control of phase angle between the field and compensating windings. It is expected that the results should be widely used in practical applications.
펄스발전기는 고속으로 회전하는 로터의 운동에너지를 관성 에너지의 형태로 저장하였다가 필요시에 펄스형태의 대전력 전기에너지로 출력하는 전원장치의 하나이다. 본 논문에서는 회전로터에 대하여 펄스발전기의 특성을 고려하기 위해 로터 설계인자들에 대한 이론적, 실험적 접근법을 적용하여 설계인자들의 강성효과에 대한 규명과 고감쇠 베어링의 특성해석을 수행하였고, 이를 토대로 고속 운전시의 회전 안정성을 예측하였다. 펄스발전기의 실제 구현을 위하여 3 MJ급 소형모델에 대해 전기회로를 구성하고 설계된 전기회로에 대한 해석을 통하여 출력을 예측하였으며, 전자기장 및 전자기력 해석을 통하여 권선 상호간의 작용력을 산정하고, 공극에서의 전자기장 분포 및 전단응력 분포를 구하여 설계를 위한 구조해석을 수행하였다. 또한, 해석결과를 적용하여 3 MJ급 소형 펄스발전기 모델을 실제로 설계, 제작하였으며, 이를 이용하여 실험을 통해 전자기장 분포와 각 권선의 설계변수 등을 검증하고, 실제 운전 중 무부하 및 부하조건에서의 출력 성능실험을 통하여 펄스발전기의 전기적 성능특성을 검증함으로써 해석 및 설계의 타당성을 제시하였다.
