View Single Post
Old 06-16-2017, 01:11 PM   #3130 (permalink)
Master EcoModder
Join Date: Sep 2010
Location: Saskatoon, canada
Posts: 1,481

ChargE (not yet running) - '92 Mazda MX6 LX
90 day: 33.89 mpg (US)

Ford Prefect - '18 Ford F150 XLT XTR
Thanks: 747
Thanked 560 Times in 443 Posts
2011 Polaris Ranger EVs

I now have 3 of the 4 Ranger EV's at home and have spent some time looking through the various connectors and parts of the vehicles.

The motor is a Permanent Magnet AC motor (what is the different between PMAC and Brushless DC or BLDC?), but I have no ratings on voltage or max speed.

The Sevcon Gen 4 AC controllers are rated for 650A and have a 48V DC pack (somewhere around 43V is low voltage cutout and the original Lead-acid charger floats at 57.6V). The docs don't mention a boost circuit and I cannot locate an inductor so I expect that the motor is driven directly by PWM of the pack voltage. Speed is limited to 25 kph but I am confident that is a setting in the controller and not a limitation of the motor.

There is encoder feedback although I won't know what voltage until I get a service manual.

Paul - driving this motor (eventually) with my AC controller - would I need to load different firmware or is that a setting change? I have a lot of work to do getting everything else working first, before I venture into replacing the controller and running it at higher top end speed.

I think it would make an interesting video to start from 'here is a motor mounted in a vehicle drive train' and progressing through 'there is not much info on the motor but we entered what we had', 'here is how we did the initial tune' and finally 'this is how it runs after we played with the tuning some more'. It will likely be at least a year before I get to that point though.

What do you think?
In THEORY there is no difference between Theory and Practice
  Reply With Quote
The Following User Says Thank You to thingstodo For This Useful Post:
MPaulHolmes (06-17-2017)