关键词: 高速永磁电机, 薄规格硅钢片, 铁损耗特性, 机械特性, 温升控制

Abstract: Iron core loss of high-speed permanent magnet motors under high-frequency operating conditions is a key bottleneck restricting the improvement of their efficiency. Taking 0. 15 mm and 0. 20 mm thin-gauge silicon steel sheets as well as soft magnetic alloys as the research objects,based on the Bertotti iron loss model,this paper adopted a combination of square frame testing and prototype experimentation to investigate the influence laws of material magnetic properties, punching sheet thickness and connection methods on motor iron loss, mechanical characteristics and temperature rise characteristics. The experimental results showed that the unit iron loss of 0. 15 mm silicon steel sheets was the lowest,which was 35. 5% lower than that of 0. 20 mm silicon steel sheets; under high-frequency ( frequency > 1 600 Hz ) operating conditions,the iron loss increase amplitude of thin-gauge silicon steel sheets was more than 40% lower than that of thick ones,and the advantage of temperature rise control was significant. The connection method of punching sheets has no significant impact on motor performance,while the material magnetic density and iron loss characteristics are the key factors determining motor adaptability.

Key words: high-speed permanent magnet motors, thin-gauge silicon steel sheets, iron loss characteristics, mechanical characteristic, temperature rise control