Schild, L.L.SchildNeuhaus, C.C.NeuhausGolembiewski, J.J.GolembiewskiFaulwasser, T.T.Faulwasser2026-05-042026-05-042026-0318th Interdisciplinary AUTOMED Symposium in Collaboration with the TC Medical Robotics, AUTOMED 2026https://hdl.handle.net/11420/62920Field-weakening is an established technique for exceeding motor base speeds while maintaining constant input power. To improve energy efficiency of emergency ventilators, this paper presents a methodology for reducing torque to lower the input power of brushless DC (BLDC) motors during phases of constant pressure. Using the Clarke-Park transformation, the operating point is obtained by minimizing the voltage and then applied as phase-advance angle and modulation index in the voltage model. A proof-of-concept experimental setup yields power savings of up to 40% using field-weakening compared to conventional field-oriented control approaches, demonstrating its feasibility for energy savings in BLDC motors.enhttps://creativecommons.org/licenses/by/4.0/Technology::610: Medicine, HealthConference Paperhttps://doi.org/10.15480/882.1705210.18416/AUTOMED.2026.247910.15480/882.17052