1. H

    Motor rewind help

    Hi guys, I’m a trainee in motor rewinding, due to furlough I’ve been pretty much working on my own the last 4 months so trying to teach myself to some success but also becoming stuck as I am now. I have an old Woods of Colchester 60slot single phase 8pole perm cap 220/240 volt fan motor. It’s a...
  2. N

    Very new to this. If I were to make a DC Motor shaft with cogs and gears circuit, how would I know the required ampage of my power unit?

    Very new to this so bare with. If I were to make a DC Motor shaft with cogs and gears circuit, how would I know the required ampage of my power unit (im thinking, battery AA holder). And are there any pre cautions I should take to prevent damage or potential fire hazard? I roughly know about...
  3. K

    Mosfet not switching off with solenoid valve.

    I want to switch on a 12V 1A(peak 1.4A) solenoid valve for 0.1-3 seconds(set using a trimpot) and then switch it off. I'm using 555(operating at 5V, triggered by a IR sensor which operates on 5V only) in monostable mode to generate a 0.1-3s pulse, which is fed directly to gate of mosfet(IRF540-...
  4. C

    Help identify a motor

    Hello everyone, I've been searching over the internet for a while and i didn't find anything useful. I have a dc motor and I don't know what type it is, nor what is it for. I don't know where I got it from. Can someone help me identifying it ? (sorry if I'm not at the right place) Thanks in...
  5. V

    What Battery/batteries to Use for EDF Project

    Hello everyone! I’m glad to have found this forum as I am an engineering student at University of South Florida. I had a question about batteries and motors, specifically what rechargeable batteries to buy for my specific need here. I am building a skateboard powered by 2 electric ducted...
  6. brenduan

    Arduino Motor Circuit Only Getting Less Than 1V

    Hello, I have built this motor circuit for my Arduino and when running it only gets less 1v and the motor spins very slowly and my bigger motor doesn't spin at all. I have attached the diagram that I followed below. The Motor should be getting 5v from the Arduino although something seems to be...
  7. Art Duino

    Old 1/4-HP Motor Trips GFCI Under Heavy Start Load

    I bought a tool grinder with a 1/4-HP GE motor which is probably 50 years old. The motor runs on 115 volts at 1725 RPM. A thin belt connects it to a pulley on the shaft that holds the grinder wheel. The grinder's bearings are bad. They provide a lot of resistance to rotation. I am in the...
  8. C

    BLDC motor torque control using current measurement

    I would like to control 18V BLDC motor of battery powered drill. What I want to do remake the drill to nut runner (torque wrench), so I need to sense a motor current which is proportional to motor torque. My controller will include microcontroller. Here are some questions: How battery voltage...
  9. O

    Old Dental Micro motor power supply problem

    Hi! I have a very old Kavo Brand German made micro motor (probably made around 1970s-80s). It it a very well built tool but the power supply is suffering from some problem. When the brushed motor hand piece is connected and powered on, it will spin but in constant pulses (maybe 1 second on, 1...
  10. Theo_KVA

    Electrical switch for a non-chemical battery - How to do it?

    Hi everyone, I’m seeking guidance. I have a tricky situation which I don’t really know how to get out of. I want to design a system which would consume the least amount of power possible. The idea is to have an ESP8266 do a simple task every minute (updating a e-paper display) and sleep the...
  11. Theo_KVA

    Generator at low RPM for a non-chemical battery - What to look for?

    Hello! I’m in the process of trying to build a non-chemical battery. I sick a bit of guidance as I tend to go down an engineer rabit hole, because of the complexity that the project is aiming. My goal is to make some kind of object that could store enough energy to charge a smartphone’s...
  12. Lambo Av

    L293N enquiries for Robots with PIC microcontroller

    Hi, all. I have downloaded an L293N motor driver for my Proteus 8 Professional from the following website. https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html Based on the video link in the website (or you can click here: ), it says that the 2 pins (unknown to...
  13. Lambo Av

    Obstacle Avoiding Robot using PIC Microcontroller

    Hi all, I am currently working on this robot with the guidance of the following website "https://circuitdigest.com/microcontroller-projects/obstacle-avoiding-robot-using-pic16f877a" The circuit diagram is as shown below The L293D motor driver module he used looks something like this while...
  14. J

    Single phase induction motor trips breaker

    Hi, So I've got this rotary floor sander I've got to fix. When I opened it I noticed someone had fixed it before and 1 of the capacitors had swollen. I've been told it had been working for a long time before the capacitor broke. I assumed the silver one was the run capacitor and the blue broken...
  15. super7800

    first fpga schematic and pcb design help

    hello! i am a second year first semester EENG student, and for the digital project this semester we are tasked with programming a fpga to do something (i.e. clock, calculator, stop light, etc). Disclaimer: *the project requirements does not include creating a circuit. most/all are simply using...
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