projepeddie

projepeddie - Vehicle Design Summit Electric Hub Motor (V2)...

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Vehicle Design Summit Electric Hub Motor (V2) Eric Conner Harvey Tang Matthew Peddie
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Motivation • The AHPV from VDS 1.0 used an expensive, NGM electric hub motor, costing roughly $8000. (picture on right) • VDS 1.0 required a new electric hub motor to serve as both a replacement for the NGM motor, and as a stepping stone design for VDS 2.0.
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Requirements (Preliminary) • 10 kW continuous Power • 90%+ efficiency optimized for 45 miles an hour. • Motor weight less than 30 kg • Must interface with EV-C200 controller • Acceleration from 0-60 mph in less than 15 s. • Solar/Battery power must be used • Constant Torque with speed variation
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Constraints • Motor must fit between wheel and suspension arm, not interfere with other components • Motor cannot draw more power then controller can supply Torque must not surpass limit of suspension arm bolt hole
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Preliminary Design Choices Design Choices Æ Why did we decide to design a 3-phase, axial gap, double sided, slotted, surface mounted brushless DC motor? Note, these design choices were made based on research, not simulated optimization. Brushless Hub Motor Æ Comparison to Brush Hub Motor higher efficiency and reliability (reduction of electromagnetic interference) reduced noise longer lifetime (no brush erosion) However, more difficult to control (resolved by digital control) Why 3-phase? Excellent starting conditions with smooth rotation and low torque ripple Æ No structural resonance and induced mechanical stress –F l e x i b l e Æ Work with large variety of magnet configurations, winding configurations, and coil winding Good conductor utilization Æ Higher phases give better utilization but are offset by increased numbers of leads and transistors
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Preliminary Design Choices (Continued) • Why axial gap? – Spatial limitations Æ Motor must interface with suspension arm; fixed dimensions. – Axial Gap gives compact machine construction and short frame with much shorter rotor in axial direction, and thus less overall thickness – High power density. – High efficiency; no rotor copper losses due to permanent- magnet excitation.
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This note was uploaded on 11/08/2011 for the course AERO 16.810 taught by Professor Olivierdeweck during the Winter '07 term at MIT.

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projepeddie - Vehicle Design Summit Electric Hub Motor (V2)...

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