Wonder how important a 24V supply would be for the jigging motor

[Joshua_S]

I'm trying to design a jigging machine for a fishing boat, using a RaspPi as the controller. (A jigging machine jerks a 1kg lure up and down near the sea bed, and pulls in a fish when it's hooked.)

The motor I'm hoping to use is here: http://www.kynix.com/Parts/3227730/34KM-K122-99W.html and the supplier recommends I recommends I use a 24V supply.

However, the boat I want to fit the machine to has only 12V. I'm trying to assess the pros and cons of different approaches.

The simplest solution is to just use a 12V supply to the motor. I understand I'll need thicker wires to supply this. I'm thinking that using 12V will generate more heat and produce less torque. There will be times that the machine will need to pull up several fish at a time from 50m deep - say a 20-30 kg load. And sometimes the hook will snag the bottom. I'll include a current monitor, so I could limit or cut the supply when there is too much load. I don't know how often this might happen till I try it though, and how inconvenient it would be.

I've ruled out having 2 batteries, in parallel when the engine is running and in series when the engine is stopped, using solenoids to switch - the engine is often left running while the boat is fishing, as it needs to continually drift with the tide/wind, then motor back up to the spot where the fish are.

So I think the only other option is to buy a second battery and wire in series, swap the 12V alternator for a 24V alternator, and have something that supplies 12V from the 24V for the GPS, radio etc.

Naturally, I'd favour the first option, but I wonder how important a 24V supply would be for the jigging motor, and how much we'd lose out going with the 12V option.

Thanks for any further input on my inputs quandary.

 

[vas]

isn't 200 steps per rev a bit excessive for what you really want?
how is it going to cope with the alteration of diameter (thus length of line on each revolution) as you drop or pick the line?

cann't you find a 12V motor with say 20steps per rev and do it slightly easier/cruder?
Converting the boat engine to 24V is not as simple as it sounds (depending on gauges/auxiliaries, etc)

Fishing is not my thing, and other than seeing some unbelievable prices on some fishing kit for deep sea trolling (or how you call that thing) I've no idea.
Have played with arduinos and raspberries though...

good luck

cheers

V.

 

[kashurst]

If you are going to use a rasberry Pi to control the whole thing, why not use a 12v DC motor (loads of choice and cheap) in a 4 transistor motor bridge for direction/start/stop and use a PWM (either hardware or software) output to control the speed/torque.
Much easier and probably cheaper and saves bu@@ering about with the rest of the boat.

Question - how do you know if there is a fish(s) on the line ?

 

[Joshua_S]

Thanks for all your responses, I was going by the recommendation of Phidgets. I was hoping I'd be able to plug a motor and controller into the RaspPi and use their driver code to handle the electronics. I'll look at using a DC motor. It might be cheaper, but then I'd have the issue of interfacing the RaspPi with the DC motor, without the assistance provided by Phidgets. A windscreen wiper motor from a car would be too lightweight. I'm hoping to wind the hook and weight from a depth of 50m within 2-3 minutes, as well as cope with the greater load of 2-3 pollack weighing up to 25-30 kg altogether....

 

[rotrax]

They will be some special pollack if you are fortunate enough to catch any large ones.

The British rod caught record from a boat is well under 15 Kilos. I have some experience and have never yet seen a 10 Kilo Pollack.

Much less hassle to blue the dosh on an electric reel and use a parbuckle to pull and release the line to cause the jigging action.

Much easier-and more sporting- to fish conventionally...........................................

IMHO, of course.