Abstract
In this paper, a permanent magnet synchronous motor (PMSM) with sleeves on the rotor outer surface is investigated. The purpose of sleeves is to fix the permanent magnets and protect them from being destroyed by the large centrifugal force. However, the sleeve material characteristics have a great influence on the PMSM, and therewith, most of the rotor eddy-current losses are generated in the rotor sleeve, which could increase the device temperature and even cause thermal demagnetization of the magnets. Thus, a sleeve scheme design with low eddy-current losses is necessary, and a method suppressing the local temperature peak of permanent magnets is presented. The 3-D electromagnetic finite element model of a 12.5 kW, 2000 r/min PMSM with a segmented sleeve is established, and the electromagnetic field is calculated by using the finite element method. The results show the effectiveness of the presented method in reducing the eddy current losses in the rotor. Using the thermal method, it can be found that the maximum temperature position and zone of permanent magnet will change. Thus, some strategies are comparatively analyzed in order to obtain the change rule of the position and zone. The obtained conclusions may provide a useful reference for the design and research of PMSMs.
Highlights
The permanent magnet synchronous motor (PMSM), which integrates the advantages of high-power density, high efficiency, light weight, easy maintenance, and good reliability, has been widely used in commerce, industry, transportation, and so on [1,2], it attracts the interest of many researchers from the international electrotechnical field [3,4,5]
In this paper, taking a 12.5 kW, 2000 r/min PMSM with stainless steel sleeve as an example, an by by combining a time-stepping finite-element analysis method, the electromagnetic field and combining a time-stepping finite-element analysis method, the electromagnetic field and temperature temperature field are comparatively analyzed based on different strategies and methods for field are comparatively analyzed based on different strategies and methods for suppressing permanent suppressing permanent magnet demagnetization under a multi-physical field and rotor multimagnet demagnetization under a multi-physical field and rotor multi-topology structure
The maximum temperature position of permanent magnets is close to the air outlet
Summary
The permanent magnet synchronous motor (PMSM), which integrates the advantages of high-power density, high efficiency, light weight, easy maintenance, and good reliability, has been widely used in commerce, industry, transportation, and so on [1,2], it attracts the interest of many researchers from the international electrotechnical field [3,4,5]. 3-Deddy-current transient electromagnetic field has high high conductivity, and in thethe advantages copper sleeves in reducing losses was presented [14,15], and the influence of copper layer thickness on rotor eddy-current losses andin the PMSM mathematical and physical models are established, and the electromagnetic field temperature distribution was analyzed. The calculated results show the effectiveness of the presented method in reducing the mathematical and physical models are established, and the electromagnetic field in the PMSM eddy-currentislosses and temperature in the rotor. The obtained conclusions may provide a theoretical basis forbethe design and optimization of eddy-current losses and temperature in the rotor In this process, it can found that the position and zone of permanent magnet maximum temperature can change. The obtained conclusions may provide a theoretical basis for the design and optimization of PMSMs, and in addition, they can provide a useful reference for thermal studies
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