Nowadays, developing electric motorization for land vehicles is essential owing to the crucial need to save energy. This paper presents the development of a tool used in optimal acoustic and electromechanical modeling whose highly accurate calculations and speed of resolution make it stand out from standard analytical and finite element (FE) models. By coupling an analytical model with static FE simulations, our hybrid model calculates a complex global air-gap permeance per area unit, to take into account magnetic wedge permeability, preslot height, and rotor shape. An unparalleled level of precision and speed of resolution is obtained for the computation of air-gap magnetic pressures. Several results of comparisons between acoustic measurements and simulations on a concentrated winding motor for different speeds are presented.Index Terms-Air-gap permeance, distributed and concentrated windings, magnetic noise, Maxwell pressures, permanent magnets (PMs), pulse-width modulation (PWM), vibrations. 0018-9464

This paper presents an analysis of low the space order of the air-gap radial Maxwell pressures in Surface Permanent Magnet Synchronous Machines (SPMSM) with fractional slot concentrated windings. The air-gap Maxwell pressures result from the multiplication of the flux density harmonics due to magnetomotive forces and permeance linked to the magnet, the armature, and the stator slots and their interactions. One low space order is selected and different approaches are compared to determine the origin of this pressure. First, an analytical prediction tool ACHFO (Analytical Calculation of Harmonic Force Orders) is issues to calculate the space and time orders of these magnetic pressure harmonics while identifying their origin in terms of interactions between magnet, armature and teeth effects. Additionally, the analytical prediction of ACHFO is compared with the flux density convolution and finite element approaches. The main advantage of our tool is the speed of computation. Finally, an experimental Operational Deflection Shape measurement (ODS) is performed to show the deflection shape of the low space order selected.

Nowadays, the development of the electric motorization for the land vehicles is essential since the energetic challenge is become very critical. Electrical machines dedicated to this operating segment have some specifics of torque characteristics (high saturation level, important flux weakening) over the speed range. This paper presents the development of a tool used for the optimal acoustic and electromechanical modeling which stands out from standard analytical and Finite Element modeling respectively because of a high accuracy of calculations and a quickness of the resolution. Some results of comparison between acoustic measurement and simulation for different speed will be presented.