Why not check out a Lynch style permanent magnet DC motor. Typical VO is 24-48 VDC with a peak VO of 60 VDC. Nominal current draw is like 330 Amps at full rated output. It is a pancake motor design with a very wide torque band, and very high efficiency as well. There are no traditional windings or commutator. The brushes contact both ends of large bars that are in the armature. The motor can be timed for better torque/efficiency in one direction over the other, or neutrally timed for balanced torque/efficiency, by bolts on the motor case exterior.
Briggs & Stratton licensed the Lynch design and is manufacturing them here in the US under the Etek name for NEV/golf cart use. Just don't mention you want to use it for an electric vehicle when you place your order. There is some stipulation in their license that excludes them from supplying anyone but OEMs for electric vehicle use. They are available through robotics suppliers for use in battle bots.
I placed my order through NPC Robotics. They have a deal with Briggs where they custom order a more powerful version with beefier bearings, and a 1" shaft diameter. Just be sure to specify the 1" shaft option.
Be prepared to use a good electronic speed control because that motor is capable of delivering a lot more power than the published continuous ratings, and it takes a lot of amps when you push it to perform.
I bought an Alltrax AXE Model 7246, rated for 24-72 VDC @ up to 450 Amps continuous maximum. My traction battery bank is nominal 48 VDC with a peak charge voltage of near 60 VDC. I use a Curtis IN916 digital charge meter installed in the instrument cluster in place of the factory fuel guage.
BobStatistics: Posted by Bob Boyce — Thu Sep 01, 2005 7:02 pm
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