Nine‐phase six‐terminal pole‐amplitude modulated induction motor for electric vehicle applications

Abstract

In electric drive applications that are based on high-speed induction motors (IMs) with an extended speed range, stator winding pole-changing is a possible technique to avoid oversizing the driving motor. The electronic pole changing employed in multiphase IMs has gained recent interest because it avoids physical winding reconfiguration. The effective number of poles of the air gap flux distribution can be electronically altered by simply changing the applied current sequence to a multiphase stator. The main problem associated with this technique is the significant increase in machine magnetising current with the increase in effective pole number when conventional multiphase distributed windings are employed. This study proposes a new fractional-slot concentrated winding layout with a special stator connection suitable for pole-amplitude modulated IMs that offers a 2:1 pole ratio while maintaining equal magnetising current for both winding pole pairs. Moreover, constant power operation can be achieved for a speed range of over 4 pu. The main concept is discussed and verified through simulations and experimentally. The machine mathematical model and the required vector space decomposition-based controller are also presented.

Analysis and Design of Innovative Magnetic Wedges for High Efficiency Permanent Magnet Synchronous Machines

“…FCSW has been considered in the last 15 years as a valid alternative for PMSMs with respect to the traditional distributed winding. Many researches are present in the literature, mainly related to three-phase radial-flux machines [1][2][3][4][5], but also on axial-flux [6], tubular and flux-switching machines, and to machines with more than three phases [7]. Nevertheless, in this paper, the analysis of FCSW has been limited to the most widespread application, i.e., three-phase radial-flux machines.…”

Field-Oriented Control of Multiphase Drives With Passive Fault Tolerance

“…electric vehicles or aircraft), it brings economic benefits in applications where the corrective maintenance might become temporarily unfeasible (e.g. offshore wind energy systems) [1][2][3][4][5][6].…”

Steady-state characteristics of DFIM : the potentialities ofintegration in electrical traction systems

“…Depending on the needs of electric machines in EVs, the researchers have made an extensive study of several structures and a comparative study on the use of various electric traction motors in the aim to identify the most suitable one for EV applications was reported in [32,[34][35][36]. Based on the comparative study in a literature review [37,38], the VSTS equipped with Induction Motors (IMs) have been the most common candidates owing to their reliability, robustness, and ease-of-maintenance. The IMs have the most mature technology compared to other AC competitors.…”