Cedric Lynch who designed the motor on which the Etek is based, is a friend
of mine. He made extensive tests of the etek and knows it's limitations.
If you go much over 300 amps then the efficiency falls off a cliff.
The motor has been 'value engineered' down to a specific cost/performance
level and you can't do much to improve it. No ONE thing is limiting the
performance, it's a combination of copper, laminations, brushes, magnets,
and insulation. If you need more torque, use a higher reduction ratio, or
add a second motor.
One thing they got very wrong originally and caused much amusement to the
Chinese over the 'stupid yanks' was the dimensions of the motor. It was all
designed in imperial or inch dimensions! Most dimensions are of course
fairly arbitrary, but thread sizes and bearings are not. It would have
doubled the cost of the motors if the bearings and most of the threads
hadn't been converted to metric., since the factory would have has to buy
special tooling. Years ago Prestolite motors in the US used metric bearings
internally since they knew that metric bearings are less than half the cost
of imperial on the world market.
Paul Compton
www.evguru.co.uk
www.sciroccoev.co.uk
www.bvs.org.uk
www.morini-mania.co.uk
www.compton.vispa.com/the_named
