Its kind of hard to explain, its being used on a custom bed that pulls up behind a wall. The problem is as the bed goes up is slows down, unless I up the volts and when it goes down, its goes too fast unless I cut the volts.What is it going to be used in?
Unless he just connects them together mechanically and electrically so they can't be out of sync. I assumed that's what he was doing- one motor on each side of the bed. The bed is the common mechanical connection.Now if the two motors have to remain in sync during an Up or Down cycle, that makes this infinitely harder...
Thats what I was thinking, just to make things simple. The motors will always be in sync because they are couple together.One idea is to just have a power supply with two different preset output voltages, higher voltage for Up; lower voltage for Down.
Presumably, there is some sort of an Up/Down switch with limit switches to stop the motors at the extremes of travel. Just add a pole to the Up/Down switch so that the power supply knows which voltage to put out.
Now if the two motors have to remain in sync during an Up or Down cycle, that makes this infinitely harder...
So what are you using as a power supply? Voltage? Current? Regulated or not?Thats what I was thinking, just to make things simple. The motors will always be in sync because they are couple together.
I'm using a 6/12v trickle charger until I decided which power supply to get. I have it set at 6 volts at 10 amps, going UP its just a tad slow and going DOWN its a tad to fast. At 12 volts it moves too fast in both directions. I am going to pick two speed controllers and a couple of limit switches and call it a day.So what are you using as a power supply? Voltage? Current? Regulated or not?
If your supply is adjustable, what voltage to you have to set it to for Up vs. Down?
A battery charger puts out rectified DC with no filtering, so it has a lot of ripple. It also has very poor voltage regulation; in fact it is more a current-source rather than a voltage source. No wonder your motors are not well behaved.I'm using a 6/12v trickle charger ... I have it set at 6 volts at 10 amps, going UP its just a tad slow and going DOWN its a tad to fast. At 12 volts it moves too fast in both directions. I am going to pick two speed controllers and a couple of limit switches and call it a day.
I found a 5 volt psu that is adjustable up to 5.5 volts and a 9 volt psu that is adjustable down to 7.5 volt, just my luck. Can I use the 9 volt psu with a speed controller to get the speed just rightA battery charger puts out rectified DC with no filtering, so it has a lot of ripple. It also has very poor voltage regulation; in fact it is more a current-source rather than a voltage source. No wonder your motors are not well behaved.
If you can lay your hands on a 5 to 10Ah 6V battery, try that as a temporary power source for the motors. The motors may run much better in both directions.
In any case, you should be looking for a 5 to 7Vdc, adjustable, electronically regulated, 10A power supply. Check the surplus stores. They frequently sell industrial power supplies like that. Most have a screwdriver adjustment over that voltage range.
I think that your motors would run well on a regulated 5VDC supply.I found a 5 volt psu that is adjustable up to 5.5 volts and a 9 volt psu that is adjustable down to 7.5 volt, just my luck. Can I use the 9 volt psu with a speed controller to get the speed just right
great, I will go ahead and order them. They are cheap so its not a big deal if they don't work.I think that your motors would run well on a regulated 5VDC supply.