Question about trolling motors

[pontoonman]

Hi, goddess. Sorry if I came across as a know it all, I don't! Got carried away in my explanation.

http://musicbycybertron.com/q960_vcpwm_mod.htm

Pon



[quote flygoddess][quote pontoonman]Going by what is in this ad for minn kota, I don't see any evidence that anything radically new should favor their energy draw. [url "http://www.djsmarineblog.com/trolling-motor-reviews.html"]http://www.djsmarineblog.com/...g-motor-reviews.html[/url] There is a lot of hype credit taking for what is basically old

Pulse Width Modification technology.

They are still using ancient, inefficient, brush carbon shedding commutator motors because they are very cheap and allow a huge markup. The energy savings would be in converting to brushless electronically commutated motors with a rotating case called outrunners. That's what's being used in solar and electric boat competitions and some electric vehicles. But electronics are sensitive to water, and fail around salt water, so that's why I liked the resistor type back when I was into big boats. You can't make more energy output from digital speed control except compared to resistor control as they point out. Actually, if you run only at high speed the resistor control is MORE efficient because there is zero draw to the non-existinng PWM electronics, but they don't mention that.... And why the different hypes of UP TO 3, 3.5 and 5 times the efficiency (only at THEIR chosen speed, BTW) and battery heat reduction, when essentially any PWM control does this? That said, I have 2 minn kotas and they have been rugged motors over many years back when I used them. The resistor type can be run at double voltage on highest speed and produce double power by switching to a less agressive prop without tearing into the motor, as would be required for digital.

Hope this helps.

[quote Fishtales23]Hi Pon,

I wish I knew where I saw it. I should have made a note of it. Rats!

Thanks![/quote][/quote]





Pulse Width Modification technology....I think you mean Pulse Width Modulation.


Wouldn't Brushless be hard for DC and a compact size?[/quote]
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