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This paper presents a comparison of losses at no load and full load of six different induction motors which rated powers are between 3kW to 280kW. The results show that additional core losses are strongly dependent on the load of the motor. The reason is the saturation of rotor tips which leads to an increase of the effective slot openings and the strengthening of harmonic by the induced currents...
This paper investigates a back to back test simulation of an interior permanent magnet (IPM) synchronous machine with fractional slot concentrated windings (FSCW). The studied machine is designed to equip a floating vertical axis wind turbine. The principal characteristics and the structure of the machine are presented, as well as the back to back test principle. The parking brake mode is investigated...
The goal of this paper is to describe the materials and building technique to design a high-temperature induction machine which temperature winding is about 500°C. First, the candidate materials are identified and because of the constraints imposed by these materials, a special geometry is proposed. The authors show that inorganic insulation has to be preferred for the conductors and the slot insulation...
This paper presents an analytical approach to characterize a flux concentration permanent magnet synchronous machines (PMSM) with fractional slot concentrated winding (FSCW). The very particular configuration of the studied machine leads the authors to associate a fictive winding to the stator coils in order to be able to determine the Ld and Lq inductances. Experimental measurements, done on the...
This paper compares three winding wires commercially available for operating at high-temperatures. These wires are stressed by thermal constraints in the temperature range of 20–500°C. The insulation resistance, the tan δ, the parallel capacity and the behaviour under AC voltage strength are quantified with the temperature. The curvature radius, which becomes crucial for inorganic insulated wires,...
Vibrations and noise in transformers core have two main origins: the Maxwell's forces, located in the corners, and the magnetostriction inside magnetic steel. In this paper, these two phenomena are differentiated and analyzed and analyzed using a test bench, which allows comparing the vibrations of two different annular structures. In the first case only the magnetostriction occurs, whereas the second...
The paper develops an efficient computational method for establishing equivalent characteristics of magnetic joints of transformer cores, with special emphasis on step-lap design. This enables comparative analysis of designs without the need for difficult measurements.
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