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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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10-30-2014, 02:53 PM | #11 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Bought new cart and its going 18mph???
Quote:
Unlike series wound motors, the armature and field winding in Sepex (aka Shunt wound) motors are separately excited, so the torque curve can be altered on the fly using a process called Field Mapping and the net result is that carts with sepex motors don't slow down as much on hills as carts with series motors do, but they do slow down. Tire height is part of the final drive ratio, so you tend to get more speed with taller tires, but available torque is reduced. Stock tire height is 18", so 23" tires is about a 28% increase in speed and about a 22% loss in torque where the rubber meets the road. Stock speed for a DCS is about 14 MPH, so a 28% increase is about 18MPH, but it would slow down more on hills than a DCS with stock height tires. That means the hill is mild, or the cart has more modifications than just taller tires. (Or your perception of how much it slows down is contaminated by prior experience on series carts. ) The stock DCS controller (Curtis 1206SX) didn't have a low voltage cutoff and it had some other issues, so they tend not to last very long with tires over about 20". Of course, some people have ran them with tall tire for years, but they are the exception rather than the rule. It will be interesting to find out what controller and motor you have. |
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