1. lookingforhelp

    How to rewire old food processor motor

    Okay so i have a food processor motor but i cant find a wiring diagram and would need help how to wire it to work as a generator or just as a on off motor.
  2. D

    What can burn out a 3 phase motor ? Can turning it on and off be effective?

    Hello everyone ... For a project, I want to make an escalator smart with a number of PIR sensors So that the escalator turns off after one minute of not using it And for example, turn on 20 seconds later If this cycle continues, can it damage the engine? The specifications of this motor are 9 kW...
  3. maitrey

    Design Reference Sources (NFPA, NEC Codes & Standards)

    Hello All, I am a young professional electrical engineer who has just started working in Automation field. We build customized panels including PLCs, HMIs, Pushbuttons, Lights, Relays etc., I have been searching for a reference codes and standards that can be helpful for designing and wiring...
  4. Udara mendis

    Selecting a suitable motor type for a dynamic braking application?

    I'm designing a dynamic braking unit for an indoor cycling system to replicate the resistance experienced by a cyclist while cycling. I have read through different motor types which can be used for my application but could not decide on which one to go with. What parameters should I consider...
  5. D

    how calculate the energy use for starting a 3 phase motor until return to normal work?

    hello everyone , for a project i must calculate the exact energy that used for start of motor until the motor return to normal work in other words how much energy use for normal work of this motor equals the starting energy ? the motor is 3 phase 20 Ampere 9KW unfortunately i have no complete...
  6. P

    Can somebody help identify this 12V fridge compressor motor and driving circuit functioning

    Hello, I would like to repair this brushless 12V fridge compressor motor (Danfoss 2.5) but first of all understand how it functions. Inside are 3 coils. It has an electronic driving unit: 2coils (photo 3)pin1-pin3 and pin3-pin4 of them are driven by mosfets. Total number of mosfets=3: (the third...
  7. P

    Duty Cycle Calculation

    I am trying to solve a numerical where the Speed of a DC motor operating at 15V was measured to be 2000 rad/sec. Now a PWM signal is applied to the same motor to get a speed of 400 rad/sec. If the voltage amplitude of the PWM signal is 5V, then what should be the value of duty cycle? I know the...
  8. D

    Electronic circuit for a dispenser

    Hi, I would like to request help from anyone who can help. I am currently doing a project which is creating a simple dispenser. This dispenser requires a programmable timer which when activated will cause a motor to rotate a piece of acrylic for about 0.75-1sec to release sand granules. The...
  9. 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...
  10. 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...
  11. 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-...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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