OK I finally had a little time now the wife is feeling better.
I picked up one of the candidate motors Sat.
It is a Thermo king
1.4 hp
1700 rpm
27 volt dc
51 amps
If I push this to 36 volts I think that would make possibly apx. 2000 watts of power. If I can get the gearing to get the rpms up I think it may work. If I can get 50 mph for short durations like 5miles That would get me into the 45mph zones in the city.
I also came across a died 24 volt scooter. I think I can use the throttle speed controller and maybe the speed controller. It is one of those cheap Chinese ones that sold for 250-300 dollars about 4years ago. I'll get photos up on the motor and the scooter as soon as The rain will permit.
What are the thoughts of success of the Idea?
john
Hope all is well.
pushing the motor from 27 to 36 will allow the motor to get up to speed much easier without too much of an issue, but since you will be pushing the motor well over a 20% increase of it's rated voltage, you might need to have a close look at the windings. Make sure they are up to the task and can handle the extra work. You'll be trying to ask them to work an extra 500 watts.
The cheap set might be okay for testing , but I would not rely on them for very long. Most of these were/are built for the throw away society and may be even at their limit when pushed at 24V, going to 36V on these may let out the magic smoke.
You may be better off building a PWM for it and use the 5k POT throttle to go from stand still to wide open. Let gearing and tires get you up to the speed.
At 36V and if you can get the full 51A, that 1800+ watts so you certainly need a good sized battery bank.
I would shoot for being able to take it 15 miles at the 45mph and set your battery range for that.
Welcome back
Bruce S