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Energies 2018, 11(11), 3119; https://doi.org/10.3390/en11113119

On Field Weakening Performance of a Brushless Direct Current Motor with Higher Winding Inductance: Why Does Design Matter?

1,†
,
2,†,‡,* , 3,†
and
1,†
1
Electrical Engineering Department, Istanbul Technical University, Istanbul 34467, Turkey
2
Electrical and Electronics Engineering Department, Istanbul Okan University, Istanbul 34959, Turkey
3
ABB UK Engineering Centre, Leicestershire LE67 4JP, UK
These authors contributed equally to this work.
Current address: Akfirat, Istanbul 34959, Turkey.
*
Author to whom correspondence should be addressed.
Received: 14 October 2018 / Revised: 4 November 2018 / Accepted: 8 November 2018 / Published: 12 November 2018
(This article belongs to the Special Issue Permanent Magnet Synchronous Machines)
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Abstract

This paper comprises the design, analysis, experimental verification and field weakening performance study of a brushless direct current (BLDC) motor for a light electric vehicle. The main objective is to design a BLDC motor having a higher value d-axis inductance, which implies an improved performance of field weakening and a higher constant power speed ratio (CPSR) operation. Field weakening operation of surface-mounted permanent magnet (SMPM) BLDC motors requires a large d-axis inductance, which is characteristically low for those motors due to large air gap and PM features. The design phases of the sub-fractional slot-concentrated winding structure with unequal tooth widths include the motivation and the computer aided study which is based on Finite Element Analysis using ANSYS Maxwell. A 24/20 slot–pole SMPM BLDC motor is chosen for prototyping. The designed motor is manufactured and performed at different phase-advanced currents in the field weakening region controlled by a TMS320F28335 digital signal processor. As a result of the experimental work, the feasibility and effectiveness of field weakening for BLDC motors are discussed thoroughly and the contribution of higher winding inductance is verified. View Full-Text
Keywords: brushless dc motor; phase-advanced method; winding inductance; sub-fractional slot-concentrated winding; field weakening; periodic timer interrupt brushless dc motor; phase-advanced method; winding inductance; sub-fractional slot-concentrated winding; field weakening; periodic timer interrupt
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ustun, O.; Kivanc, O.C.; Senol, S.; Fincan, B. On Field Weakening Performance of a Brushless Direct Current Motor with Higher Winding Inductance: Why Does Design Matter? Energies 2018, 11, 3119.

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