Abstract
Fractional slot, PMSM motors with a properly designed electromagnetic circuit allow for obtaining high power density factors (more than 4 kW per 1 kg of total motor weight). The selection of the number of magnetic poles to the specific dimensions and operating conditions of the motor, as well as the number of slots for the selected number of magnetic poles is the subject of the analysis in this article. This issue is extremely important because it affects the mass of the motor, the value of shaft torque, shaft power and the value of rotor losses. The aim of the work is to select solutions with the highest values of power density factor and, at the same time, the lowest values of rotor losses. The object of the study is a fractional slot PMSM motor with an external solid rotor core with surface permanent magnets (SPM). Motor weight is approximately 10 kg, outer diameter is 200 mm and a maximum power is 50 kW at 4800 r/min. The article analyzes the selection of magnetic poles in the range from 2p = 12 to 2p = 24 and various slot-pole combinations for individual magnetic poles. The target function of the objective was achieved and the calculations results were verified on the physical model. The best solutions were 20-pole, 30-slots (highest efficiency and lowest rotor loss) and 24-pole, 27 slots (highest power density).
Highlights
Academic Editor: Lorand SzaboHigh power density electric motors present a significant challenge in the field of electric drives
Much attention has been paid to the influence of the slot-pole combinations on rotor losses, as it is one of the main factors determining the value of these losses
The purpose of the analysis presented in the article is the appropriate selection of both the number of magnetic poles to the specific operating conditions of the motor and overall dimensions, as well as the selection of the appropriate slot-pole combinations
Summary
High power density electric motors present a significant challenge in the field of electric drives. Much attention has been paid to the influence of the slot-pole combinations on rotor losses, as it is one of the main factors determining the value of these losses Another key issue analyzed in this paper is the appropriate selection of the number of magnetic poles 2p to the specific dimensions and operating conditions of the motor. The phenomenon of negative impact on rotor losses due to incorrect selection of the slot-pole combinations is known from the literature [15,29] These papers focus on the theoretical consideration of the issue without taking into account the target operating conditions and requirements for high power density motors, which significantly determine the specific values of these losses. The motor analyzed in the work [32] has a power about 750 W, and in this work about 50 kW (maximum power), so the scale of the problems in terms of losses in the rotor is completely different
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