5715ch6 - © 2006 by Taylor & Francis Group,...

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Unformatted text preview: © 2006 by Taylor & Francis Group, LLC 6-1 6 Automotive Claw-Pole- Rotor Generator Systems 6.1 Introduction ....................................................................... 6-1 6.2 Construction and Principle............................................... 6- 2 6.3 Magnetic Equivalent Circuit (MEC) Modeling ............... 6- 6 6.4 Three-Dimensional Finite Element Method (3D FEM) Modeling .......................................................... 6- 9 6.5 Losses, Efficiency, and Power Factor............................... 6- 14 6.6 Design Improvement Steps.............................................. 6- 17 Claw-Pole Geometry • Booster Diode Effects • Assisting Permanent Magnets • Increasing the Number of Poles • Winding Tapping (Reconfiguration) • Claw-Pole Damper • The Controlled Rectifier 6.7 The Lundell Starter/Generator for Hybrid Vehicles.............................................................................. 6- 24 6.8 Summary........................................................................... 6- 32 References.................................................................................... 6- 33 6.1 Introduction Increasing comfort and safety in cars, trucks, and buses driven by combustion engines require more installed electric power on board [1]. As of now, the claw-pole-rotor generator is the only type of automotive generator used in industry, with total powers per unit up to 5 kW and speeds up to 18,000 rpm. The solid rotor claw-pole structure with ring-shaped single direct current (DC) excitation coil, though supplied through slip-rings and brushes from the battery on board, has proven to be simple and reliable, with low cost, low volume and low excitation power loss. In general, the claw-pole-rotor generator is a three-phase generator with three or six slots per pole and with 12, 14, 16, 18 poles, and a diode full power rectifier. Its main demerit is the rather large losses (low efficiency), around 50% at full power and high speed. Producing electricity on board with such high losses is no longer acceptable as the electric power require- ments per vehicle increase. Improvements to the claw-pole-rotor (or Lundell) generator design for better efficiency at higher powers per unit are currently under aggressive investigation by both industry and academia, and encour- aging results were recently published. © 2006 by Taylor & Francis Group, LLC 6-2 Variable Speed Generators The first commercial mild hybrid electrical vehicle, launched in 2002, makes use of the Lundell machine as a starter/generator. This chapter presents both simplified and advanced modeling of the Lundell generator for steady-state and transient performance. Pertinent control and the latest design improvement efforts and results are also included. The chapter ends with discussion of the starter–generator mode Lundell machine, with its control and design aspects for hybrid electric vehicles....
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This note was uploaded on 03/03/2010 for the course POWER 332 taught by Professor Dr during the Spring '10 term at Ain Shams University.

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5715ch6 - © 2006 by Taylor & Francis Group,...

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