Analysis of the specific weight and size indicators of a high-speed permanent magnet synchronous motor
DOI:
https://doi.org/10.15588/1607-6761-2026-1-3Keywords:
specific indicators, synchronous motors, permanent magnets, high-speed motorAbstract
Purpose. Determination of the dependence of specific power and specific volume on the calculated power and design dimensions for the formation of criteria for assessing the efficiency of weight and dimensions of a high-speed synchronous motor with permanent magnets and an external rotor.
Methodology. Classical methods of electromagnetic calculation of the main dimensions of synchronous motors with magnetoelectric excitation.
Findings. According to the results of calculations of weight and dimensions of high-speed synchronous motors with permanent magnets, performed by the classical method, the weight and volume of active materials were determined: magnetic core, permanent magnets and stator winding copper. For the calculation, the power range from 250 W to 15 kW at 10,000 rpm was adopted, which corresponds to the most frequently used motors in terms of power in various industries and applications. The nonlinear nature of the change in specific parameters of synchronous motors with permanent magnets was established. It was determined that the maximum specific power (about 80 kW/kg) is achieved in the range of 7–9 kW, after which this indicator decreases due to thermal limitations and an increase in the mass of structural elements. The optimal power range according to the specific volume criterion, with a cylindrical design of the prototype with an external rotor, is 1.5–4.5 kW. The results of the research show that with increasing power, the mass balance changes: the relative proportion of copper in the stator winding increases, while the proportion of the magnetic core decreases. This is due to the need to minimize electrical losses to maintain high efficiency and restrictions on heat dissipation.
Originality. The dependence of the specific characteristics of high-speed indicators of synchronous motors with permanent magnets with an external rotor on their geometric parameters and the level of use of active materials was systematized, which allowed identifying the zones of the highest efficiency of the design at a constant rotation speed.
Practical value. The proposed approach provides engineering criteria for a well-founded choice of topology and basic dimensions of high-speed engines at the early design stages, ensuring the achievement of the best weight-to-size characteristics.
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Copyright (c) 2026 M.A. Kovalenko, S.S. Tsyvinskyi, I.Y. Kovalenko, Y.A. Haidenko, O.V. Trukhanov
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