Variable Speed Brushless Hybrid Permanent Magnet Generator for Hybrid Electric Vehicles

Omid Beik, Nigel Schofield, Ahmad Al-Adsani

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Citations (Scopus)


Hybrid permanent magnet (HPM) generators have been proposed as engine mounted machines operating at fixed rotor speed and generating via simple passive rectifiers into a variable vehicle system DC-link voltage. As such, the machine excitation is controlled to maintain delivered power output. This paper studies the variable speed operation of a (HPM) generator in a series hybrid electric vehicle (SHEV) within some specific driving cycles. The study investigates different scenarios in terms of the possible operational regions for the HPM generator at different speeds. A HPM generator designed to deliver controlled power into a varying system DC-link voltage at fixed rotor speed is used as a reference design. Two further designs are then developed to study the impact of varying generator speed on machine design and excitation requirements. The loss analysis for the three designs is conducted including the losses in the passive rectification stages used in the system. Simulation studies are carried out for different HPM generator power levels at different speeds. The simulated performance characteristics of the HPM are validated via test data from a prototype machine and loading system.

Original languageEnglish
Title of host publication2014 IEEE Transportation Electrification Conference and Expo (ITEC 2014)
Subtitle of host publicationComponents, Systems, and Power Electronics - From Technology to Business and Public Policy
Number of pages6
ISBN (Electronic)9781479922628
Publication statusPublished - 24 Jul 2014
Externally publishedYes
Event2014 IEEE Transportation Electrification Conference and Expo - Dearborn, United States
Duration: 15 Jun 201418 Jun 2014


Conference2014 IEEE Transportation Electrification Conference and Expo
Abbreviated titleITEC 2014
Country/TerritoryUnited States


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