rewind Solenoid? Answered

Dear All .. My original solenoid winding by awg 30 magnet wire,  now I would like to  rewind new  with 2 x awg 33 So please help me to know : -The new (2x awg 33 )  they power as identical  as  1x awg 30  magnet wire? Thank you so much .

Question by lam.huuminh.3   |  last reply


Rewinding a DC motor for different voltages

I modified small DC motors, like used in toys and such but now I have one that requires to do it properly.Motor in question runs on 24V and uses about 3.5A under full load.Drives a high pressure water pump on either side of the shaft.The rotor is basically empty with just a few turns of wire and lots of empty space.I assume the same model is used for multiple power configurations by the manufacturer.For the toys my basic approach was to just calculated the number of turns or to count them when removing.From there I get the voltage per turn and can rewind accordingly.So in theory and by blissfully ignoring all higher things involved I could do this motor the same way.Right now I see 10 windings per coil, so with thicker wire I would use 5 to run it on 12V at roughly the same speed.Only problem is that thing then would use around 7.5 to 8A when running under full load and get quite hot.I need the speed to keep the flowrate at the same 7.5L per minute but I also need the power to be able to still get the 120PSI from just 12V.Isn't there any winding trickery that would allow me to reduce the required current a bit without sacrificing on speed or torque?

Topic by Downunder35m   |  last reply


Is repairing a burned tool/drill motor easy?

I assume this applies to all tools. So, I have a burned out grinder motor (wires). The spining axle 'thing' looks fine. Can't I just re-wound those wires on outer ring of the motor and reconnenct it (good as new?) also I may have scraped (with pliers) the replacement/wounded copper wire when bending it away from center . Will I need to rewind it with another set of wire....have I ruin it given there's some sort of non-conductive coating on the copper wire which I scratched off. I would appreciate any specific advice on reconnecting the power source wires to the wire/magnetic field area as well. Or should I just spend $200 on a new one :)

Question by jimboa2020red   |  last reply


OSIM uSqueez foot massager sparking how to?

OSIM uSqueez permanently dead. Dismantled unit found mother board 2A fuse blown. Check everything OK on mother board and replace fuse. Power on unit led under stop button light up. Pressed vibrator button works perfect. Pressed massage button strong sparking sound and saw fire in one to two second followed by blown fuse. 1. Measure the motor terminal resistance -> 0 ~ 5 ohms. Or it should should have some high resistance approximately 10 ~ 50 ohms. 2. Measure BR-B3D thermal protector which was in series with the black wire -> 0 ~ 5 ohms. Any idea which one is faulty part? 1. Think the thermal fuse is OK. 2. If the motor short, shall I do rewinding for rotor? Can't found this motor locally and if buy direct from OSIM too expensive! Any idea measure rotor coil? Thanks

Question by GearUp   |  last reply


transformer help needed

Hi guys, i'm a newbie on here so i would like to take this opportunity to say hello :) i have a salvaged transformer that i'm working on at the mo. It is the primary that is blown, but the secondary is fine. I am in the uk, so it is designed to run on 240. Because i am looking to produce high amps, one solution would be to use the secondary as a primary, otherwise i am looking at doing a full rewind. i'm kinda new to transformers, but have enough knowledge for the job in hand. my question is how many turns does the primary need to have? i know that you cant give me an exact figure without the dimensions of the transformer in question (700w microwave transformer if that helps) but i seem to remember from school physics that there is an equation to work out the number of turns a primary must have at a given voltage, i have googled for days to no avail, i'm guessing it is out there somewhere, but i cant find it :( and the last question is that if the transformer was to have too few turns on the primary, what would happen when it was plugged in? my guess would be that it would short out the mains and the coil would rupture, possibly tripping the circuit breaker? many thanks to anyone who replies :) and merry xmas to all :) 

Topic by jbaz73   |  last reply


AC MOT Welder Voltage Issue

Hello everyone, I've been working on an arc welder based on instructables like https://www.instructables.com/id/Small-110-volt-arc-welder-NYDG/ but I need some advice. Most tutorials on here suggest two paths to success, either winding two MOTs with as much 10 gauge wire as possible, hoping that the voltage output in series will be close enough to 40V, or using multiple small transformers, also in series. The problem is, all this series stuff really cuts down on the available amperage, so I'm wondering if there's a different way to get high amps and volts simultaneously (obviously without surpassing the available 2400 Watts, energy in = energy out). I think I have a way to make two MOTs which run at low voltage but high amperage also have high voltage. I've made a high frequency circuit to assist in starting an arc, which you can see attached (it works phenomenally, and I've been able to make it run on 1 amp). Since the output on the HF part goes through a torroid at the far right (where it meets the welder's output), would it be possible to wind the torroid with, say, 5:20 turns, to basically take the 120A (10.8V) I get from the parallel-connected MOT transformers and overlay a low-amperage but higher voltage on it, to make arc start/run easier? The welder just won't run at 10.8v, so other than rewinding the secondaries, what about jumping the voltage up a little via the output torroid?

Topic by reakter