| Electronics > Projects, Designs, and Technical Stuff |
| maximum stepper motor wires |
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| T3sl4co1l:
--- Quote from: Simon on October 28, 2019, 08:00:06 pm ---It's a 48 step motor that will be run at 400rpm. I guess I twist the cables to each coil so that I reduce inductance as much as possible. --- End quote --- No additional effort here will make a measurable difference. Just use harnessed wires or multiconductor cables so it's not loose and blasting EMI everywhere. :-+ --- Quote from: Kleinstein on October 28, 2019, 08:06:42 pm ---48 steps per rev. and 400 RPM is 320 steps per second. This is already quite fast and would normally need quite some reserve voltage to overcome the winding inductance. So this would be more something for a 2 V motor using a 14 V supply. From distant memory the maximum speed with close to nominal voltage would be more like 10-50 steps per second with a good ramp and low load. --- End quote --- I don't know that it needs that much more voltage. It would still spin on its own, I think; but the available torque will definitely be small, and we are talking a fairly small motor already. (I admittedly don't have much experience with steppers, you may well be spot on.) Probably a good time for OP to mention what kind of load this thing is under... :) Tim |
| Simon:
This is the motor data sheet. It drives a "rotary diaphragm" pump (a variation on the peristaltic pump). |
| beanflying:
Re potted drivers a quick search revealed some options for IP65, 66 and even 67 so maybe use that in your searches. Unless you are stuck for space oversizing the controllers to manage any heat then pot your own. Out of interest as it is what I used to do is this on a chemical metering job? There may even be a better complete option to drop in the hole with less fuss. |
| Simon:
--- Quote from: beanflying on October 29, 2019, 09:44:45 am --- Out of interest as it is what I used to do is this on a chemical metering job? There may even be a better complete option to drop in the hole with less fuss. --- End quote --- No, condensate water pump for air conditioning. We always need something that self primes, and we don't need masses of flow but don't have much space. We have used actual peristaltic's in the past but these do a bit more flow for the size as this is what they are aimed at rather than metering. They claim that these will deal with sludge unlike diaphragm pumps that have little valves that will get jammed open with crap and stop the thing functioning. |
| Simon:
I did find a driver, but they are like £25 (it is used on peristaltic pumps we have used in the past). As I am using 2 pumps I could make a single driver PCB for both for the price of one and incorporate all the air conditioning controls. When you look at all the electromechanical bits used in air conditioning you can replace the lot with one single electronic controller. The problem is getting my boss to not look at it as the price of a PCB assembly versus one of the cheap electromechanical items but to be willing to make the jump and change everything to electronic at which point I have the budget for a PCB design. |
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