Transcript Slide 1
PACE Meeting Summer 09 Emerging Market “Electric” Vehicle (EMEV) University of Puerto Rico – Mayaguez (UPRM) Our Specifications • Powerplant: Electric In-Wheel Motor • Specifications: Same as IC enginebased EMV. After interpreting specifications provided by PACE, motor requirements are: Axial Flux Permanent Magnet In Wheel Motor • Required Torque: 81 N-m • Maximum Angular Velocity: 1474 rpm • Proposed Max Angular Acc: 0-40 mph in 10 s. • Required Power: 20 KW per motor Radial Flux vs. Axial Flux • • • • • Better heat removal Higher power density Compact Large diameter to length ratio Adjustable air gap Our selection: PM Brushless DC Brushes vs. Brushless 2 Electromagnetic Analysis Magnetic Density Stator coil winding 3 Parametric Analysis Inputs: • Rotor and Stator- A-27 Steel because of low density and high max magnetic flux density • Windings - Copper Gauge AWG16-20 • Magnets- Alnico due to high flux density and operating temperatures Outputs: • Motor diameter: 10 inches • Number of phase: 3 • Turns: 54 turns • Required Current: 38 A • Torque Produced: 105 N-m (81 required) • Rated Back EMF: To be determined 4 Summer ‘09 Version 4 lug wheel Bolts Stator Magnets Brake Disc Integrated Version Steering and Braking Issues There were no geometrical issues with the integration of the motor to the steering system. The brakes and caliper mount were redesign for the in-wheel electric motor, because the space was limited. Steering Column 3-D Load Analysis: Torque Input (100 N-m) Critical regions 2-D Simulation of motor’s cover. Contours of Stream Function (kg/s) Fasteners, Shafts and Bearings Bearings 9 Future Work • Consider iterating dimensions to increase performance • Optimize components to reduce assembly time and cost • Validate the numerical results with experiments Acknowledgement 2008-09 UPRM Team Team Leader Jose Lugo EM Analysis Juan C. NX Drafting Quintana Michael Cruz Prof. Diaz Structural Analysis INME 4012 summer 2009 FEM Juan Reines Emmanuel Irizarry Prof. Goyal Integration of Power Suspension CFD Controls and Steering Byron Luis E. Pabon Keishla M. Zambrano Carlos Cruz Gerena Prof. Leonardi Prof. Ortiz Michael Rodriguez Bearings Rolando Gonzales Breaking Systems Xavier De Jesus We will like to acknowledge Universidade de São Paulo direction and other PACE universities for their help during the design process of the EMEV. We also like to acknowledge UPRM, PACE members, and administration for all the project support during the last year. References Yang, Y. Chuang, D. “Optimal Design and Control of a Wheel Motor for Electric Passenger Cars” IEEE Transactions on Magnetics . Vol. 43, No. 1 Jan. 1, 2007 Wijenayake, A. Bailey, J. McCleer, P. “Design Optimization of an Axial Gap Permanent Magnet Brushless DC Motor for Electric Vehicle Applications”. IEEE 1995 Gonzalez, D. Tapia, J. Wallace, R. Valenzuela, A. “Design and Test of an Axial Flux Permanent-Magnet Machine with Field Control Capability” IEEE Transactions on Magnetics . Vol. 44, No. 9 September 2008 Gieras, J. Wang, R. Kamper, M. “Axial Flux Permanent Magnet Brushless Machines” Springer 2008 Second Edition. Berdut, E. “Levitation and linear propulsion system using ceramic permanent magnets and interleaved malleable steel” US Patent 5431109 July 11, 1995 Medici, E. “Finite Element Simulations and Optimization of Berdut Linear Motor for a Novel Elevator System” UPRM 2008