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Usage of fractional slot concentrated windings (FSCWs) in electrical machines offers several advantages due to their simplicity and compactness. However, the magnetic field of FSCWs has more space harmonics, including sub-harmonics that lead to undesirable effects. High rotor losses, noise, vibrations and thermal problems are the main drawbacks caused by FSCWs. These disadvantages limit the suitability...
Recently, a novel electrical machine category called “Stator Cage Machine” has been presented. For this type of machine an analytical method for the inductance calculation is described based on MMF computation. Ampere's Law then leads to the magnetic field strength and consequently the inductance will be calculated evaluating the magnetic energy. The analytical calculation method is validated by diverse...
Permanent magnet synchronous machines with tooth concentrated windings are widely used in today's hybrid electric vehicles (HEV). This is due to several well-known advantages provided by concentrated windings. Nevertheless, excessive heat generation in the rotor, caused by magnet losses, continues to be a major challenge for vehicle manufacturers. Usually magnet segmentation is proposed to meet the...
This paper presents a comparative study of two different FSCW PM machines for application as integrated motor-generator in hybrid vehicles. The first machine design contains the conventional concentrated winding with q=0.5 that is recently used in many hybrid systems for commercial vehicles, whereas the second machine use the new 18-teeth/10-poles concentrated winding with the optimized magneto motive...
This paper presents a comparison of two inlet permanent magnet synchronous machines with concentrated windings. A novel 24-teeth/28-poles machine design with flux barriers in the stator teeth is compared to a common 30-teeth/20-poles design, which is widely used for hybrid electric vehicle (HEV) applications. Detailed comparison of important machine characteristics such as torque ripple, iron losses,...
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