Abstract
This paper presents three-different high efficiency and low costs electric machines types for automotive applications. For the PM machines with the single-layer concentrated windings, a novel stator topology with magnetic flux barriers in the stator teeth is used to increase the power density and the efficiency of the machine. Using this technique the material amount for the considered PM machine is reduced about 20% compared with the conventional design. For the asynchronous machines, two alternative solutions are presented; a new winding type with low space harmonic contents and also an ASM rotor with series connection of rotor bars solve the problem with high harmonics. Further, during the design of a new self-excited synchronous machine with concentrated winding, the high MMF winding harmonics are used to excite the rotor field winding.
Highlights
In recent years, the requirements for better performances, safety, reliability, and lower cost and emissions in automobiles have driven the development of electrical machines using innovative materials and new design techniques
Fractional slot tooth concentrated windings are widely used for permanent magnet (PM) machines
The high price for the magnet material, the demagnetization problems, and the negative effect of the winding space harmonics on the machine efficiency and noises are the main drawbacks of the PM machines with concentrated windings
Summary
The requirements for better performances, safety, reliability, and lower cost and emissions in automobiles have driven the development of electrical machines using innovative materials and new design techniques. The concentrated windings are characterized with more space harmonics, including sub-harmonics, which lead to undesirable effects, such as eddy current loss in the magnets [1, 2], additional iron losses in rotor and stator core, and noise and vibrations [3, 4]. Different from the PM machines, these machine types use usually distributed winding in the stator, and for the current excited synchronous machines they need the brushtype exciter system for the rotor field winding. Considering the required additional space for the excitation system for the current synchronous machines, they represents the main drawbacks for these machine types for the application where the high power density, available volume, efficiency and the system. A novel self-excited synchronous machine concept solves the problems with the brush excitation system
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