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Old 07-13-2016, 08:59 AM   #41
MPS1982
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Default Re: Wiring to eliminate reverse

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Originally Posted by JohnnieB View Post
Oops, the fact it is a friction drive on the tire's circumference managed to dodge around the few functioning brain cells I have left.

So you effectively have a 2" tire height and a 0.8:1 final drive ratio, which will give you 23.8 MPH at 3200 motor RPM (25 MPH is 3361 RPM)

As for finding an inexpensive series motor, try posting a WTB in the but/sell parts forum here: http://www.buggiesgonewild.com/golf-carts-parts/


In addition to a smoother ride, the tall tires have a lower impact angle on the bumps and might reduce the drag a little.

Yep, now we're on the same page.

I posted a wtb in the parts forum. Also offered a trade. Not sure if a sepex motor is as valuable as a series. On one hand, it seems much less versatile. On the other, if you need a sepex, only a sepex will do.
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Old 07-13-2016, 10:39 AM   #42
JohnnieB
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Default Re: Wiring to eliminate reverse

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Originally Posted by MPS1982 View Post
.............Not sure if a sepex motor is as valuable as a series. On one hand, it seems much less versatile. On the other, if you need a sepex, only a sepex will do.
Au contraire mon ami.

The Speed/Torque curve of a series motor is cast in stone at the factory, while the Speed/Torque curve is a sepex motor can be altered during operation and regenerative braking is more easily obtainable with a sepex motor.

Of course a sepex controller is more complex than a series controller since it controls armature current and field current separately, plus controlling the regen braking.

For some applications a series motor is the best choice while a sepex motor is better for other applications. In very general terms, a sepex motor won't produce as much low end torque as a series motor and a series motor won't produce as high of RPM for a given load and voltage applied as a sepex motor, but there is a huge overlap between the two extremes where the both do well.
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Old 07-13-2016, 12:24 PM   #43
MPS1982
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Default Re: Wiring to eliminate reverse

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Au contraire mon ami.

The Speed/Torque curve of a series motor is cast in stone at the factory, while the Speed/Torque curve is a sepex motor can be altered during operation and regenerative braking is more easily obtainable with a sepex motor.

Of course a sepex controller is more complex than a series controller since it controls armature current and field current separately, plus controlling the regen braking.

For some applications a series motor is the best choice while a sepex motor is better for other applications. In very general terms, a sepex motor won't produce as much low end torque as a series motor and a series motor won't produce as high of RPM for a given load and voltage applied as a sepex motor, but there is a huge overlap between the two extremes where the both do well.
Well, I like acceleration at least as well as overall top speed. Do you by any chance have 0 RPM torque figures for each motor?
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Old 07-13-2016, 06:16 PM   #44
JohnnieB
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Default Re: Wiring to eliminate reverse

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Well, I like acceleration at least as well as overall top speed. Do you by any chance have 0 RPM torque figures for each motor?
Nope. All the dyno tests I've seen tend to be from over a 1000 RPM at the bottom and under 6000 at the top.
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