关键词: 混合励磁电机, 高速电机, 冷却系统, 温度场, 流固耦合

Abstract: The hybrid excitation motor has two sets of windings, a complex structure, and a concentrated heat source. The reasonable design of its cooling system is of great significance for the hybrid excitation motor. A three-dimensional thermal simulation model of the water-cooled casing was established based on the electromagnetic design parameters of a 300 kW high-speed hybrid excitation synchronous generator, and the temperature rise of the motor under different operating conditions was analyzed. A hybrid cooling system with axial ventilation and a hybrid cooling system with open aperture ventilation in the casing were designed to address the high temperature rise of only water-cooling method. The temperature rise and inlet pressure of the motor were compared and analyzed when two hybrid cooling systems were used under different air flow rates. The results showed that the cooling structure with open aperture ventilation in the casing can effectively reduce the temperature rise and inlet pressure of hybrid excitation motors, providing reference significance for the design of high-speed hybrid excitation motor cooling systems with such structures.

Key words: hybrid excitation motor, high speed motor, cooling system, temperature field, fluid-structure coupling