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Recent content by theode

  1. theode

    Hello all. We have 10 identical br

    Brakes may need adjusting.If set too tight a slightly higher voltage will be needed to operate.Different rates of wear and tear. Although most operate at the 200 volt start up,the other three need the higher voltage to get away.
  2. theode

    Electric motor sound

    As well as fan noise,there are also other mechanics in the mix. Even the ẃindings of the motor give off an electrical hum. Add to that the driven components (drum,pumps etc) and associated bearing surfaces,it can get a bit noisy. A 'dry' bearing spinning at over 3000 rpm can sound like a 747...
  3. theode

    How to optimize the space in end-winding of a three-phase induction motor

    When winding coils,the excess at the ends is to allow fitting into the slots. Also the coils need shaping to allow each phase to fit in. You could try winding each coil a slot at a time in the stator and pull the ends tighter. When winding,the wire is quite soft.This makes it easy to shape the...
  4. theode

    rc filter and insulation monitor

    They used to be called suppressors years ago. A means of stopping radio interference. When measuring insulation to earth/ground,you get a reading through the capacitive element of the filter. Disconnect the lead(s) connected to earth/ground while testing.
  5. theode

    Electric motor insulation drop after cleaning

    Sometimes when using pressure washer,the dirt is moved rather than cleaned. We used a steam cleaner for such work as it breaks down grease easier. Make sure the stator has thoroughly dried out including insides of slots. Let the stator cool right down before testing,as a slightly warm stator...
  6. theode

    Corrosion (Rust) in Rotor (electric motor)

    I agree with Scotty. Try a couple out first. They should run quiet and smooth.You will soon hear if the bearings need changing. There's not a lot of grease in sealed bearings usually.Just enough to lubricate.
  7. theode

    Corrosion (Rust) in Rotor (electric motor)

    Check the windings for earth/ground fault. There is only superficial rust on your pic. Should be ok.
  8. theode

    How to know actual wattage of motors without capacitor?

    Lets try and get this into context. Due to the numerous types and designs of motors it is virtually impossible to detect wattage accurately. Cap start/induction run ,Cap start/cap run,Induction start/Induction run,Permanent cap,split phase etc ,to name a few Also various speeds give various...
  9. theode

    How to know actual wattage of motors without capacitor?

    You need some sort of clue to start with.Capacitor sizes can vary over the same wattage range,depending who made the motor. Also one capacitor size can run different wattages.You can rough guess from the windings (wire size,amount of turns) by seeing how full the slots look, Example, a 0.25 kw...
  10. theode

    Suggest me changing 8 pole 3 phase 7.5kw motor to 2 pole motor advisable.

    Get a new motor.All the specs will have been designed into the motor. It will be more expensive,less efficient and maybe a waste of time converting. There are many things to factor into a rewind conversion.
  11. theode

    Dab surface pump

    You could try e bay for another pcb lol,or put it down to experience. Check before switching on. Smoke is a good indicator of something not quite right.
  12. theode

    Marathon Motor

    Try a local electric motor repair shop. They may have spare used covers quite cheap.
  13. theode

    Dab surface pump

    I googled dab pump wiring diagram euroinox 25/30 and there are lots of installation pages to choose from. It appears to be quite involved,not just a case of sticking a couple of wires on. In your diagram it looks a though its fried already so may not work. Try google and see if its worth...
  14. theode

    DC motor circuit

    Have you tried the motor leads only, disconnected from the board? Does the motor turn mechanically (you need to take the motor from the gear,this gives you access to the motor shaft. It will feel a bit tight because of field magnets. One problem with this type of motor is the magnets breaking...
  15. theode

    DC motor circuit

    Rough calculation makes your motor about 15 1/2 Amps running current. Your switch is rated ac only so is not suitable. You could try an automotive store or breakers yard for dc switches and relays. Batteries are your easiest bet for the supply because you'd need a transformer and rectifier...
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