Abstract
Interest in multilayer windings is increasing with the application of the hairpin winding technology to the manufacturing of electrical machines. Therefore, the four-layer fractional slot concentrated winding is used for the initial design of the machine in this paper. The proposed physical model of the machine uses winding with a relatively high number of turns which is inappropriate to hairpin winding. Therefore the round-wire winding is created and the three-layer winding is derived and analyzed including the effect on the slot leakage inductance. The thermal analysis is then applied to the physical model of the machine to evaluate the slot-related thermal properties of the slot and the whole machine. The measurement is compared with the finite element analysis (FEA) and the equivalent slot thermal conductivity and heat transfer coefficients of the stator and rotor are obtained.
Highlights
Modern trends in the design of permanent magnet synchronous machines (PMSM) are focusing on different parts of the machine with a similar goal; increase the efficiency or the power density of the machine
Two elementary equations are used for the exact setting of the heat transfer coefficient
The calculated equivalent thermal conductivity of the slot and heat transfer coefficients of the stator and rotor surface are applied to the 3D steady-state finite element analysis (FEA) of the rotating machine
Summary
Modern trends in the design of permanent magnet synchronous machines (PMSM) are focusing on different parts of the machine with a similar goal; increase the efficiency or the power density of the machine. The design of the multilayer machine is inspired by the three-layer fractional slot concentrated winding described in [20]. It turns out that the proper definition of the slot heat transfer coefficients is the crucial part of the thermal design of modern electric machines that often use water-cooled housing and the slot is the area of the dissipating of the heat generated in the winding. The experimental validation of the slot heat transfer coefficient of this physical model can be an important part of the complex thermal design of modern electric machinery. Coil widths bc and bm are defined by total slot width bs and number of turns Nc and
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