研究目的
To analyze and test the efficiency of a high-power pulsed power supply based on a homopolar inductor alternator (HIA), focusing on losses and their impact on energy conversion efficiency and design optimization.
研究成果
The efficiency of the high-power pulsed power supply based on HIA is between 75% and 80%, with armature copper losses being the largest contributor due to skin and squeezing effects, followed by iron losses. Theoretical calculations align with test results, aiding in inertial energy storage estimation. Design recommendations include optimizing rotor slot depth, air-gap length, vacuum degree, winding configuration, and pole number to minimize losses and improve efficiency for capacitor charge power supplies.
研究不足
The study focuses primarily on HIA losses, with limited discussion on rectifier and line losses. Experimental challenges include difficulty in directly measuring winding copper losses and rotor iron losses induced by armature currents. The assumptions in analytical models (e.g., constant permeability, neglected curvature effects) may introduce inaccuracies. Optimization is constrained by factors like vacuum degree affecting insulation and fabrication difficulties for transposition windings.
1：Experimental Design and Method Selection:
The study involves theoretical calculations and experimental testing of losses in a pulsed power supply system using HIA. Methods include finite-element method (FEM) simulations for eddy-current losses and ac resistance, analytical models for windage and iron losses, and experimental measurements of efficiency and various losses under different conditions.
2：Sample Selection and Data Sources:
A prototype HIA with specified parameters (e.g., rotor diameter 554 mm, pole pair number 13) is used. Data are collected from tests conducted at different rotating speeds, vacuum degrees, and charge voltages.
3：List of Experimental Equipment and Materials:
Equipment includes the HIA prototype, vacuum pump, capacitors (7820 μF), rectifier devices (thyristors and diodes), and measurement instruments for voltage, current, and speed. Materials involve silicon-steel sheets for stator and rotor, copper windings, and air for windage loss studies.
4：Experimental Procedures and Operational Workflow:
Tests are performed with and without vacuum pumping. Windage and mechanical losses are measured at various speeds. No-load iron losses are obtained by subtracting windage and mechanical losses from total no-load losses. Efficiency is tested during repetition pulses of charge and discharge processes, with energy calculations based on capacitor voltage and rotor speed changes.
5：Data Analysis Methods:
Data are analyzed using fitting curves (e.g., for windage losses proportional to speed power), FEM simulations for eddy-current and ac resistance calculations, and statistical comparisons between theoretical and experimental results to verify consistency.
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