关键词: 双槽正弦调制不均匀分布转子, 损耗, 温升, 转子热应力

Abstract: To optimize the power spectrum distribution, the unevenly distributed rotor induction motor with double-slot sinusoidal modulation adopts an asymmetric rotor structure, with dense rotor slot distribution and narrow tooth grooves in some regions. This results in increased loss in the dense area during frequent starting or continuous operation, and increased temperature rise. The increased temperature rise affects the material performance and is prone to triggering the fracture in the stress concentration area. To address this challenge, the present study utilizes a two-dimensional electromagnetic field loss model to calculate the electromagnetic loss. It also employs a three-dimensional temperature field simulation model, loading the two-dimensional loss density as a heat source to simulate the transient temperature rise process. Through the simulation and analysis of a power 900 kW water-cooled proposed motor, the temperature distribution of each component is obtained. Based on the temperature field results, thermoset coupling simulation is carried out, pointing out the location of the rotor guide bar prone to fracture. This provides a reference for the thermally optimized design of the proposed motor.