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Posts: 670
Location: Otsego, MN | I know a guy who had a 36 volt system and now is running a 24 volt set up for his bow mount. He has not dissconneted the 3 batteries to make it a 24 volt set up. Is it harming the motor or batteries by not rewiring the system?? He has a 80lb auto pilot now and it is not running right all the time, was wondering what damage he is doing if any to the motor or batteries. |
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| Well, it probably won't harm the batteries, but it can't be good for the motor. You can run a 12 volt system on 24 volts too.........just not for long. I've been told that too much voltage will make a motor spin faster than it was designed to. Personally, I haven't tried it because, well, that's just dumb. |
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Posts: 2754
Location: Mauston, Wisconsin | Pedro- Doesn't sound like he's the sharpest hook in the box. The batteries are going to be fine. However, he's going to damage the motor and/or electronic controls, etc. They were designed for 24V supply, not 36V. That's a 50% increase over the design voltage
Yes, the motor will spin faster, but the windings are being overstressed by the excessive voltage- same for the electronic control's.
"it is not running right all the time" - Does he stop scratch his head, wonder why, then curse the manufacturer?
Have fun!
Al |
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Posts: 670
Location: Otsego, MN | That's what I thought, overstressing the motor. |
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Posts: 433
Location: Cedarburg, Wisconsin | Tough to answer than question for sure without seeing the schematics of the motor control circuitry. If the input voltage goes through a regulator rated to handle 36V or more then probably no damage to the circuitry unless there is voltage feedback from the motor in which case there would be resistors matched to 24 volts for optimum response. The feedback could be too high and might cause the filtering opamps feeding the micro to go unstable from having an input higher than the supply voltage, which could overvaltage the micro inputs and then all bets are off as to what might happen. The motor can be run at higher voltages without burning it up immediately but over the long run it will die an untimely death. It just isn't a very practical way to do things. Most likely any damage that will occur has already started and will only get worse with time. |
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Posts: 2754
Location: Mauston, Wisconsin | This is getting pretty off course. If one thinks about this as similar to water pressure; what is the effect of increasing the water pressure in your house by 50%, i.e., not a good thing! Yeah- perhap's the DC to DC converter for the electronics might make it to 36V, then again I seriously doubt it. Most companies design electronic circuits and power electronics based on a design margin, + 50% is a bit extreme. There are no resistor's dropping voltage to the motor. More likely the motor control is using IGBT's with PWM modulation. I haven't seen to many manufacturer's of DC-DC or DC-AC power converters that designed IGBT switching circuits at +50% voltage. If they did, they couldn't be competitive.
End result- he's not the sharpest hook in the box! I assume he's going to claim a warranty failure when it finally stops working. This is part of the problem with the cost of equipment today, especially equipment which contains power electronic's, i.e., he's violating the operational specifications of the unit/motor. Will he tell the manufacturer what he did? Not likely!!! It's the same as shop lifting, i.e., by claiming a warranty failure he is stealing from the manufacturer. The manufacturer has to make a profit to stay in business- if all their customers do this they are dead!
"Integrity is like virginity, either you have it, or you don't!" H. Warner circa 1966.
Have fun!
Al
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Posts: 670
Location: Otsego, MN | It has been fixed, thanks for the info and some of you guys seem to really know your electronics and circuits, I thought I was reading Chinese!! |
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